Multi-point cutter for machining inner cavity of titanium alloy casting cabin

Abstract

The present application relates to a kind of titanium alloy casting cabin inner cavity processing multiple cutting point cutters, belong to turning, solve the problem that part frequently impacts cutter in prior art, leading to the rapid collapse of blade or wear of cutter.The multiple cutting point cutter of the present application includes tool holder, first carrier and second carrier installed on tool holder, and at least one ball head cutting edge installed at the lower end of first carrier and at least two ball head cutting edges installed at the lower end of second carrier;Along the cutting direction, the ball head cutting edge at the lower end of first carrier is flush with any one ball head cutting edge at the lower end of second carrier, and all ball head cutting edges are synchronous cutting;The lower edge of all ball head cutting edges is not flush.Implementation in intermittent machining process improves the service life of cutter, and improves processing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turning processing, in particular to a multi-cutting-point tool for processing the inner cavity of a titanium alloy casting cabin. BACKGROUND

[0002] Titanium alloy is a metal material with excellent performance, and has the advantages of low density and high specific strength, and is widely used in various fields such as aviation, aerospace, and shipbuilding. Large titanium alloy casting cabins have large outer dimensions and complex structures, and the parts have weak rigidity and poor tool accessibility.

[0003] At present, the turning processing method is generally used to process the inner cavity of a large titanium alloy casting cabin, and the existing turning tool generally uses a single turning blade for turning, and the processing of the part is completed by repeated turning. However, due to the multiple axial ribs in the inner cavity of the part, the ribs are unevenly distributed in the inner cavity of the part, and the processing allowance of the ribs is uneven, generally 3-5mm, which will cause "intermittent processing" during the turning processing of the inner cavity of the large titanium alloy casting cabin. "Intermittent processing" has always been a "bane" of turning processing, mainly manifested as frequent impact of the part on the tool, which causes the tool to quickly collapse or wear, which is a very troublesome problem in the industry. SUMMARY

[0004] In view of the above analysis, the embodiments of the present application aim to provide a multi-cutting-point tool for processing the inner cavity of a titanium alloy casting cabin to solve the problem that the existing part frequently impacts the tool, causing the tool to quickly collapse or wear.

[0005] The embodiments of the present application provide a multi-cutting-point tool for processing the inner cavity of a titanium alloy casting cabin, comprising a tool holder, a first carrier and a second carrier mounted on the tool holder, and at least one ball head cutting edge mounted at the lower end of the first carrier and at least two ball head cutting edges mounted at the lower end of the second carrier.

[0006] Along the cutting direction, the ball head cutting edge at the lower end of the first carrier is flush with any one of the ball head cutting edges at the lower end of the second carrier, and all the ball head cutting edges cut synchronously.

[0007] The lower edges of all the ball head cutting edges are not flush.

[0008] Based on the further improvement of the above-mentioned multi-cutting-point tool, a first ball head cutting edge and a second ball head cutting edge are mounted at the lower end of the first carrier, and a third ball head cutting edge and a fourth ball head cutting edge are mounted at the lower end of the second carrier.

[0009] Along the cutting direction, the first ball head cutting edge is flush with the third ball head cutting edge, and they cut synchronously; the second ball head cutting edge is flush with the fourth ball head cutting edge, and they cut synchronously.

[0010] The lower edges of the first, second, third and fourth ball-end cutting edges are not flush.

[0011] Based on the further improvement of the multi-cutting-point tool, the first ball-end cutting edge is located in front of the second ball-end cutting edge along the cutting advancing direction;

[0012] Along the feed direction, the two side edges of the first and second ball-end cutting edges are flush, and the two side edges of the third and fourth ball-end cutting edges are flush.

[0013] Based on the further improvement of the multi-cutting-point tool, the distance between the lower edges of the first and second ball-end cutting edges is the same as the depth of cut of the second ball-end cutting edge;

[0014] The depth of cut a of the first ball-end cutting edge satisfies:

[0015]

[0016] Wherein, H Ⅰ is the hardness of the material of the first ball-end cutting edge; H 钛合金 is the hardness of the titanium alloy cabin material; K a is a correction coefficient, and the value range is 3.0-8.9; D is the diameter of the first ball-end cutting edge, and the value range is 6-12 mm;

[0017] The depth of cut b of the second ball-end cutting edge satisfies:

[0018]

[0019] Wherein, H Ⅱ is the hardness of the material of the second ball-end cutting edge; H 钛合金 is the hardness of the titanium alloy cabin material; K b is a correction coefficient, and the value range is 2.5-8.9; D is the diameter of the second ball-end cutting edge, and the value range is 6-12 mm.

[0020] Based on the further improvement of the multi-cutting-point tool, the distance between the lower edges of the second and third ball-end cutting edges is the same as the depth of cut of the third ball-end cutting edge; the distance between the lower edges of the third and fourth ball-end cutting edges is the same as the depth of cut of the fourth ball-end cutting edge;

[0021] The depth of cut c of the third ball-end cutting edge satisfies:

[0022]

[0023] Wherein, H Ⅲ is the hardness of the material of the third ball-end cutting edge; H 钛合金H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; c H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm;

[0024] The cutting depth d of the fourth ball head cutting edge satisfies:

[0025]

[0026] H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; Ⅳ H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; 钛合金 H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; d H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm.

[0027] Based on the further improvement of the multi-cutting-point tool, the sum of the cutting depths of the first ball head cutting edge, the second ball head cutting edge, the third ball head cutting edge and the fourth ball head cutting edge is the cutting depth of the multi-cutting-point tool in machining a track.

[0028] Based on the further improvement of the multi-cutting-point tool, the lower end of the first bearing body is provided with a first mounting groove and a second mounting groove for mounting the first ball head cutting edge and the second ball head cutting edge respectively; and the working rake angle α of the first ball head cutting edge satisfies:

[0029]

[0030] H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; Ⅰ H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; 钛合金 H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; α H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm.

[0031] The working rake angle β of the second ball head cutting edge satisfies:

[0032]

[0033] H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; Ⅱ H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; 钛合金 H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm; β H is the hardness of the titanium alloy cabin material; K is a correction coefficient, and the value range is 2.6-8.9; D is the diameter of the third ball head cutting edge, and the value range is 6-12 mm.

[0034] The inclination of the bottom surface of the first mounting groove and the fixed value of the rake angle of the first ball head cutting edge are the working rake angle of the first ball head cutting edge.

[0035] The sum of the inclination of the bottom surface of the second mounting groove and the fixed value of the rake angle of the second ball head cutting edge is the working rake angle of the second ball head cutting edge.

[0036] Based on the further improvement of the multi-cutting-point tool, the lower end of the second bearing body is provided with a third mounting groove and a fourth mounting groove for mounting a third ball head cutting edge and a fourth ball head cutting edge respectively; the working rake angle γ of the third ball head cutting edge satisfies:

[0037]

[0038] H Ⅲ is the material hardness of the third ball head cutting edge; H 钛合金 is the hardness of the titanium alloy cabin material; K γ is a correction coefficient, and the value range is 14.2-25.3; c is the cutting depth of the third ball head cutting edge;

[0039] The working rake angle δ of the fourth ball head cutting edge satisfies:

[0040]

[0041] H Ⅳ is the material hardness of the fourth ball head cutting edge; H 钛合金 is the hardness of the titanium alloy cabin material; K δ is a correction coefficient, and the value range is 12.5-19.6; d is the cutting depth of the fourth ball head cutting edge;

[0042] The sum of the inclination of the bottom surface of the third mounting groove and the fixed value of the rake angle of the third ball head cutting edge is the working rake angle of the third ball head cutting edge.

[0043] The sum of the inclination of the bottom surface of the fourth mounting groove and the fixed value of the rake angle of the fourth ball head cutting edge is the working rake angle of the fourth ball head cutting edge.

[0044] Based on the further improvement of the multi-cutting-point tool, a rectangular through groove is formed in the tool holder, and the first bearing body and the second bearing body are movably fixedly connected with the tool holder by being inserted into the rectangular through groove.

[0045] Based on the further improvement of the multi-cutting-point tool, a cleaning device is further included to cool, lubricate and remove debris at the gap between adjacent surfaces of the first ball head cutting edge, the second ball head cutting edge, the third ball head cutting edge and the fourth ball head cutting edge.

[0046] The cleaning device comprises a first channel and a second channel for gas and liquid flow on the first carrier, and the jet port of the first channel and the liquid jet port of the second channel are located in the gap between the first ball head cutting edge and the second ball head cutting edge, and face the gap between the third ball head cutting edge and the fourth ball head cutting edge.

[0047] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0048] 1、 The machining tool of the present application is a multi-point dislocation tool composed of four ball head cutting edges, that is, the four ball head cutting edges cut synchronously, and the distance difference between the lower edges of the four ball head cutting edges is ≠ 0, so that the cutting depth of the machine tool running one machining track is the sum of the cutting depths of the four ball head cutting edges, improving the single cutting efficiency; and by setting the working rake angle combination of the four ball head cutting edges, that is, α < γ < β < δ, the overall sharpness of the machining tool is improved under the condition of ensuring the overall impact resistance of the tool, thereby improving the machining efficiency.

[0049] 2、 The relative position of the first carrier and the second carrier can be adjusted by the cutting depth adjusting gear, thereby the cutting depth of the first ball head cutting edge and the third ball head cutting edge can be accurately adjusted, and the position of each cutting edge relative to the titanium alloy casting cabin inner cavity during machining can be adjusted, so that the inner cavity at the bottom of the titanium alloy casting cabin can be cut to realize the machining of the titanium alloy casting cabin inner cavity in all directions without dead angle, thereby improving the machining efficiency.

[0050] 3、 The machining tool of the present application has a long service life, thereby avoiding frequent replacement of tools, thereby improving the machining efficiency, and the machining time of a single titanium alloy casting cabin inner cavity can be as low as 3.2h, which is about 1.7 times higher than the prior art.

[0051] 4、 During machining of the titanium alloy casting cabin inner cavity, the four ball head cutting edges share the machining cutting amount, reducing the machining amount borne by a single cutting edge, compared with the prior art, the wear of a single cutting edge is reduced during machining of a single part, thereby improving the service life of the tool; and one ball head cutting edge bears the main impact with a smaller working rake angle, protecting the other three ball head cutting edges, that is, the machining allowance of the ribs in the titanium alloy casting cabin inner cavity is uneven in the initial state, the ball head cutting edge first contacts the ribs, the ball head cutting edge with a smaller working rake angle has good impact resistance and bears the main impact, and the end face after machining of the ball head cutting edge is a uniform end face, avoiding the phenomenon of local intermittent cutting of uneven end faces, thereby reducing the impact on the other three ball head cutting edges, thereby improving the service life of the machining tool.

[0052] 5. When machining the inner cavity of a titanium alloy casting, the first ball-end cutting edge bears the main impact with a smaller working rake angle. Along the cutting direction, the second ball-end cutting edge, located behind the first ball-end cutting edge, bears a smaller impact. Since the two are close together, they can be considered as continuous cutting, further reducing the impact on the second ball-end cutting edge. Because the first ball-end cutting edge bears the impact of uneven ribs, the third ball-end cutting edge avoids the phenomenon of localized discontinuous cutting on the uneven end face. Along the cutting direction, the fourth ball-end cutting edge, located behind the third ball-end cutting edge, bears a smaller impact. Since the fourth ball-end cutting edge is close to the third ball-end cutting edge, it can be considered as continuous cutting, further reducing the impact on the fourth ball-end cutting edge. This further improves the service life of the machining tool.

[0053] 6. By using the cutting fluid ejection channel and the gas ejection channel set on the first carrier, the gap between the cutting edges can be cooled and lubricated, which solves the problem that the existing cutting fluid supply method may not be able to reach the gap. This achieves all-round cooling and lubrication of the cutting edge. At the same time, it can remove the debris adhering to the gap between the cutting edges and avoid debris friction on the cutting edge. This further improves the service life of the machining tool. The service life of a single cutting edge is at least 8.7 hours, which is 17.4-26.1 times higher than the existing technology.

[0054] 7. All four ball-head cutting edges of the present invention can be circular blades, and the working rake angle of each angle of the circular blade is the same. Therefore, when the cutting end of the blade breaks, it is only necessary to rotate the circular blade, and the unbroken part can continue to cut with the original depth of cut and working rake angle. The utilization rate of a single blade is improved, the cost is reduced, and there is no need to adjust the depth of cut and working rake angle during the installation process, which improves the installation efficiency and thus improves the overall processing efficiency.

[0055] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0056] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0057] Figure 1 This is a schematic diagram of the cooperation structure between the multi-point cutting tool and the titanium alloy casting chamber in the axial feed direction of the present invention;

[0058] Figure 2A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0059] Figure 3 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0060] Figure 4 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0061] Figure 5 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0062] Figure 6 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0063] Figure 7 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0064] Figure 8 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0065] Figure 9 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool; Figure 8

[0066] Figure 10 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool; Figure 9

[0067] A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool; Figure 11

[0068] A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool; Figure 12 A-A cross-sectional view of the cooperation structure of the first ball head cutting edge and the second ball head cutting edge in the axial direction of the tool;

[0069]

[0070] ​​1 - tool holder; 101 - rectangular through slot; 102 - protrusion; 2 - first carrier; 3 - second carrier; 4 - first ball end cutting edge; 5 - second ball end cutting edge; 6 - third ball end cutting edge; 7 - fourth ball end cutting edge; 8 - first auxiliary carrier; 9 - second auxiliary carrier; 10 - mounting screw; 11 - depth adjustment gear; 12 - rectangular slot; 13 - recess; 14 - first passage; 15 - second passage; 16 - titanium alloy casting; 17 - direction of rotation of titanium alloy casting about axis; 18 - titanium alloy casting axis; 19 - axial feed direction of multi-point tool; 20 - cutting advance direction; 21 - force direction of first ball end cutting edge; 22 - force direction of third ball end cutting edge; 23 - tool bar; 24 - base; 25 - upper ring; 26 - lower ring; 27 - screw; 28 - machining reference surface of first ball end cutting edge during cutting; 29 - machining reference surface of second ball end cutting edge during cutting; 30 - machining reference surface of third ball end cutting edge during cutting; 31 - machining reference surface of fourth ball end cutting edge during cutting; al - fixed value of self rake angle of first ball end cutting edge; a2 - mounting rake angle of first ball end cutting edge; Cl - distance between lower edge of first ball end cutting edge and second ball end cutting edge; C2 - distance between lower edge of second ball end cutting edge and third ball end cutting edge; C3 - distance between lower edge of third ball end cutting edge and fourth ball end cutting edge; D - diameter of second ball end cutting edge; Rl - distance between adjacent side edges of gap between first ball end cutting edge and third ball end cutting edge; R2 - distance between adjacent side edges of second ball end cutting edge and fourth ball end cutting edge; R3 - distance between lower edges of first ball end cutting edge and second ball end cutting edge in feed direction; R4 - distance between lower edges of third ball end cutting edge and fourth ball end cutting edge in feed direction; a - depth of first ball end cutting edge with machining reference surface thereof as reference; b - depth of second ball end cutting edge with machining reference surface thereof as reference; c - depth of third ball end cutting edge with machining reference surface thereof as reference; d - depth of fourth ball end cutting edge with machining reference surface thereof as reference; wl - diameter of depth adjustment gear; w2 - length dimension of upper end portion of first carrier; w3 - slot depth of rectangular slot; w4 - side wall length of rectangular slot; w5 - width of rectangular slot. DETAILED DESCRIPTION

[0071] The preferred embodiments of the present application will be described in detail below with reference to the attached drawings, wherein:

[0072] The inner cavity of a large metal casting chamber is a shell component on an aircraft. Its blank is a titanium alloy barrel-shaped casting chamber with a maximum diameter of 760mm, a maximum machining depth of 920mm, and a wall thickness of 4-5mm. There are multiple axial ribs irregularly distributed inside the casting chamber cavity. The machining allowance of the ribs is uneven, generally 3-5mm. During the machining of the casting chamber cavity, there is a situation of "intermittent machining", which causes the casting chamber to frequently impact the tool, causing the tool to break or wear quickly.

[0073] To address the above problems, this invention provides a multi-point cutting tool for machining the internal cavity of a titanium alloy casting, such as... Figure 4 As shown, it includes a tool holder 1, a first support body 2 and a second support body 3 mounted on the tool holder 1, a first ball-end cutting edge 4 and a second ball-end cutting edge 5 mounted on the lower end of the first support body 2, and a third ball-end cutting edge 6 and a fourth ball-end cutting edge 7 mounted on the lower end of the second support body 3.

[0074] like Figures 4 to 7 As shown, along the cutting direction, the first ball-end cutting edge 4 and the third ball-end cutting edge 6 are flush and cut synchronously; the second ball-end cutting edge 5 and the fourth ball-end cutting edge 7 are flush and cut synchronously; the lower edges of the first ball-end cutting edge 4, the second ball-end cutting edge 5, the third ball-end cutting edge 6, and the fourth ball-end cutting edge 7 are not flush. That is to say, during the circumferential cutting along the inner cavity of the titanium alloy casting chamber 16, the first ball-end cutting edge 4 and the third ball-end cutting edge 6 advance side by side, and the second ball-end cutting edge 5 and the fourth ball-end cutting edge 7 advance side by side; along the axial feed direction, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 advance side by side, and the third ball-end cutting edge 6 and the fourth ball-end cutting edge 7 advance side by side, and the depth of cut along the inner cavity of the titanium alloy casting chamber 16 by the first ball-end cutting edge 4, the second ball-end cutting edge 5, the third ball-end cutting edge 6, and the fourth ball-end cutting edge 7 are different.

[0075] Compared with the prior art, the machining tool of the application is provided with four ball head cutting edges arranged in pairs in the same plane along the cutting direction, the ball head faces of the first ball head cutting edge 4 and the third ball head cutting edge 6 are located in the same plane, the ball head faces of the second ball head cutting edge 5 and the fourth ball head cutting edge 7 are located in the same plane, and the lower edges of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 have a height difference, that is, the distance difference between the lower edges of the four ball head cutting edges ≠ 0, the four ball head cutting edges cut synchronously to form a multi-point dislocation tool for multi-point dislocation machining. In the cutting process, the tool cuts along the circumference of the inner cavity of the titanium alloy casting cabin 16 and advances axially along the axis of the inner cavity of the titanium alloy casting cabin 16. After one round of circumferential cutting, a circumferential machining track is formed. The second ball head cutting edge 5 cuts on the previous machining track formed by the first ball head cutting edge 4, the third ball head cutting edge 6 cuts on the previous machining track formed by the second ball head cutting edge 5, and the fourth ball head cutting edge 7 cuts on the previous machining track formed by the third ball head cutting edge 6. In this way, the cutting depth of one machining track of the machine tool is the sum of the cutting depths of the four ball head cutting edges, thereby improving the single cutting efficiency. At the same time, the four ball head cutting edges share the machining cutting amount, thereby reducing the machining amount borne by each cutting edge. When machining a single part, the wear of each cutting edge is reduced, thereby improving the service life of the machining tool. The machining tool has a long service life, thereby avoiding frequent replacement of the tool, and improving the machining efficiency. The machining time of a single titanium alloy casting cabin 16 inner cavity can be as low as 3.2 hours, and the machining efficiency is improved by about 1.7 times compared with the prior art.

[0076] The lower edges of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are not flush, that is, the lower edges of the four ball head cutting edges have a height difference. The four ball head cutting edges cut synchronously to form a multi-point dislocation tool for multi-point dislocation machining. For example, the cutting depth of the first ball head cutting edge 4 is a, the cutting depth of the second ball head cutting edge 5 is b, the cutting depth of the third ball head cutting edge 6 is c, the cutting depth of the fourth ball head cutting edge 7 is d, the distance between the lower edges of the first ball head cutting edge 4 and the second ball head cutting edge 5 is C1 = b > 0, the distance between the lower edges of the second ball head cutting edge 5 and the third ball head cutting edge 6 is C2 = c > 0, the distance between the lower edges of the third ball head cutting edge 6 and the fourth ball head cutting edge 7 is C3 = d > 0, and the cutting depth Y of one machining track of the machine tool is a + b + c + d.

[0077] Specifically, as shown in Figure 4As shown in the drawings, the multi-point cutter comprises a tool holder 1, a first carrier 2 and a second carrier 3 mounted on the tool holder 1. In order to facilitate the installation and replacement of the ball-nose cutting edges, the lower ends of the first carrier 2 and the second carrier 3 are respectively provided with a first auxiliary carrier 8 and a second auxiliary carrier 9. In order to further facilitate the installation and replacement of the ball-nose cutting edges, the lower ends of the first auxiliary carrier 8 and the first carrier 2 are respectively provided with a first mounting groove and a second mounting groove for mounting a first ball-nose cutting edge 4 and a second ball-nose cutting edge 5, and the lower ends of the second auxiliary carrier 9 and the second carrier 3 are respectively provided with a third mounting groove and a fourth mounting groove for mounting a third ball-nose cutting edge 6 and a fourth ball-nose cutting edge 7.

[0078] Specifically, the first auxiliary carrier 8 and the second auxiliary carrier 9 are mounted on the lower ends of the first carrier 2 and the second carrier 3 through mounting screws 10. One side of the first ball-nose cutting edge 4, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 is respectively screwed into the first mounting groove, the second mounting groove, the third mounting groove and the fourth mounting groove. In the cutting direction, the first ball-nose cutting edge 4, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 have two opposite faces, one of which is the mounting face of the first auxiliary carrier 8, the first carrier 2, the second auxiliary carrier 9 and the second carrier 3, and the other end is the ball-nose convex face as the working side. The edge of the convex face is a circular cutting edge, and the diameter of the two circular cutting edges is D.

[0079] Specifically, in the axial feed direction, the two side edges of the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5 are flush, and the two side edges of the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 are flush. The gap between the first ball-nose cutting edge 4 and the third ball-nose cutting edge 6 is R1=1 / 4D, and the gap between the second ball-nose cutting edge 5 and the fourth ball-nose cutting edge 7 is R2=R1. The gap between the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5 is R3=2 / 3D, and the gap between the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 is R4=R3. In this way, the smaller gap facilitates the blocking of larger chips from entering the adjacent area of the two ball-nose cutting edges, thereby reducing the wear of the first ball-nose cutting edge 4, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7, and facilitating the processing of the area close to the bottom of the inner cavity of the titanium alloy casting cabin 11 to improve the processing efficiency. For example, D is 12mm.

[0080] The depth of cut of the ball-nose cutting edge is determined according to the material hardness of the ball-nose cutting edge and the material hardness of the casting cabin to be processed, so as to improve the service life and processing efficiency of the two ball-nose cutting edges.

[0081] Specifically, the depth of cut a of the first ball-nose cutting edge 4 satisfies:

[0082]

[0083] wherein H Ⅰ is the material hardness of the first ball-nose cutting edge 4;

[0084] H 钛合金 is the material hardness of the titanium alloy cast cabin 16;

[0085] K a is a correction coefficient, and the value range is 3.0-8.9;

[0086] D is the diameter of the first ball-nose cutting edge 4, and the value range is 6-12 mm.

[0087] Specifically, the cutting depth b of the second ball-nose cutting edge 5 satisfies:

[0088]

[0089] wherein H Ⅱ is the material hardness of the second ball-nose cutting edge 5;

[0090] H 钛合金 is the material hardness of the titanium alloy cast cabin 16;

[0091] K b is a correction coefficient, and the value range is 2.5-8.9;

[0092] D is the diameter of the second ball-nose cutting edge 5, and the value range is 6-12 mm.

[0093] Specifically, the cutting depth c of the third ball-nose cutting edge 6 satisfies:

[0094]

[0095] wherein H Ⅲ is the material hardness of the third ball-nose cutting edge 6;

[0096] H 钛合金 is the material hardness of the titanium alloy cast cabin 16;

[0097] K c is a correction coefficient, and the value range is 2.6-8.9;

[0098] D is the diameter of the third ball-nose cutting edge 6, and the value range is 6-12 mm.

[0099] Specifically, the cutting depth d of the fourth ball-nose cutting edge 7 satisfies:

[0100]

[0101] wherein H Ⅳ is the material hardness of the fourth ball-nose cutting edge 7;

[0102] H 钛合金 is the hardness of the titanium alloy cabin 16 material;

[0103] K d is a correction coefficient, and the value range is 2.4-7.1;

[0104] D is the diameter of the fourth ball head cutting edge 7, and the value range is 6-12 mm.

[0105] For example, the diameter D is 12 mm, H 钛合金 is RHC30, the material of the first ball head cutting edge 4 is hard alloy, H Ⅰ is RHC70, K a is 7.10, at this time, a=1 mm.

[0106] For example, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are the same in shape, size and material as the first ball head cutting edge 4, at this time, H Ⅰ =H Ⅱ =H Ⅲ =H Ⅳ =RHC70; wherein K b =5.95, at this time, b=1.2 mm; wherein K c =6.47, at this time, c=1.1 mm; wherein K d =4.81, at this time, d=1.5 mm.

[0107] Considering that the last circle of the side wall close to the bottom of the titanium alloy cabin 16 cannot be machined by using the above multi-point cutting tool when machining the side wall close to the bottom wall of the titanium alloy cabin 16, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 of the present application can be driven by the first carrier 2 and the second carrier 3 to move up and down.

[0108] Specifically, as shown in Figures 8 to 11 , the tool holder 1 is provided with a rectangular through slot 101, the inner wall of the rectangular through slot 101 is provided with a plurality of protrusions 102 penetrating the upper and lower end faces of the tool holder 1, the outer surfaces of the first carrier 2 and the second carrier 3 are provided with a plurality of recesses 13 penetrating the upper and lower end faces of the two carriers, one face of the first carrier 2 and the second carrier 3 is inserted into the rectangular through slot 101, the plurality of recesses 13 on the outer surface of the first carrier 2 and the plurality of protrusions 102 on the inner wall of the rectangular through slot 101 are one-to-one corresponding and embedded, the plurality of recesses 13 on the outer surface of the second carrier 3 and the plurality of protrusions 102 on the inner wall of the rectangular through slot 101 are one-to-one corresponding and embedded, under the action of external force, the first carrier 2 and the second carrier 3 can move up and down in the rectangular through slot 101 of the tool holder 1.

[0109] Further, an adjusting mechanism can be arranged in the tool holder 1 to facilitate the application of external force to move the first carrier 2 and the second carrier 3 up and down in the rectangular through slot 101 of the tool holder 1.

[0110] Specifically, the adjusting mechanism comprises a depth-adjusting gear 11, and in order to form an internal chamber for accommodating the depth-adjusting gear 11, the first carrier 2 and the second carrier 3 are respectively provided with a rectangular slot 12 on the side surface abutting each other, and the rectangular slot 12 of the first carrier 2 and the rectangular slot 12 of the second carrier 3 together form the internal chamber for accommodating the depth-adjusting gear 11.

[0111] In order to move the first carrier 2 and the second carrier 3 up and down in the rectangular through slot 101 of the tool holder 1, the bottom surface of the rectangular slot 12 is a tooth surface which can be engaged with the depth-adjusting gear 11.

[0112] In order to facilitate the application of external force, the adjusting mechanism further comprises a rotating shaft, one end of the rotating shaft is connected with the depth-adjusting gear 11, and the other end is connected with a driving assembly arranged on the tool holder 1. The number of rotating shafts can be two, which are respectively arranged at the two ends of the depth-adjusting gear 11.

[0113] The driving assembly comprises a driving shaft engaged with one end of the rotating shaft and a driving motor assembly for controlling the rotation of the driving shaft. The two flat end portions of the depth-adjusting gear 11 slide with the side end surface of the rectangular slot 12.

[0114] When the depth needs to be adjusted, the driving assembly is started, and under the action of the driving assembly, the depth-adjusting gear 11 rotates. In the initial state, the lower edges of the first ball-nose cutting edge 4 and the third ball-nose cutting edge 6 are flush, if the depth-adjusting gear 11 rotates clockwise, the first carrier 2 drives the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5 to move away from the inner cavity wall surface of the titanium alloy casting cabin 16, and the second carrier 3 drives the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 to move close to the inner cavity wall surface of the titanium alloy casting cabin 16, so as to adjust the distance difference C2 between the lower edges of the second ball-nose cutting edge 5 and the third ball-nose cutting edge 6.

[0115] When the depth-adjusting gear 11 rotates clockwise, the distance P1 by which the second ball-nose cutting edge 5 moves away from the inner cavity end surface of the titanium alloy casting cabin 16 satisfies:

[0116] P1 = v1 * t1

[0117] Wherein, v1 is the linear velocity of the side end surface of the depth-adjusting gear 11 when rotating;

[0118] t1 is the rotation time of the depth-adjusting gear 11.

[0119] The distance P2 by which the third ball-nose cutting edge 6 moves close to the inner cavity end surface of the titanium alloy casting cabin 16 satisfies:

[0120] P2=P1

[0121] Therefore,

[0122] At this time, the time of the rotation of the depth adjustment gear 11:

[0123]

[0124] In this way, the position of the first carrier 2 and the second carrier 3 is accurately adjusted.

[0125] Specifically, the cuboid part structure of the upper end of the first carrier 2 and the second carrier 3 has the same size, the depth adjustment gear 11 is a cylindrical structure, and the diameter w1=w2, wherein w2 is the length of the upper end of the first carrier 2 or the second carrier 3.

[0126] The size of the rectangular groove 12 satisfies the condition:

[0127] The groove depth w3 of the rectangular groove 12 is 1 / 2w2.

[0128] The side wall length w4 of the rectangular groove 12 is 1 / 4w2.

[0129] The width w5 of the rectangular groove 12 is 2πw2.

[0130] Generally, the larger the working rake angle of the cutting edge, the sharper the cutting edge, but the weaker the impact resistance of the cutting edge. The prior art generally improves the sharpness of the cutting edge to improve the machining efficiency, but often causes the cutting tool to have a short service life and needs to be frequently replaced manually. At the same time, considering that the machining allowance of the ribs in the inner cavity of the titanium alloy casting cabin 16 is uneven, when four ball head cutting edges are arranged in pairs and advanced, the four ball head cutting edges all need to bear the main impact, and the service life of the machining tool is synchronously lost.

[0131] Therefore, the working rake angles of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are different, a ball head cutting edge first contacts the rib, the ball head cutting edge with a smaller working rake angle has good impact resistance and bears the main impact, thereby further improving the service life, overall strength and cutting efficiency of the cutting tool.

[0132] Specifically, as Figures 2 to 6As shown, the self rake angles of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are fixed values of α1, β1, γ1, δ1 respectively, the installation rake angles of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are α2, β2, γ2, δ2 respectively, the working rake angle of the first ball head cutting edge 4 is α = α1 + α2, the working rake angle of the second ball head cutting edge 5 is β = β1 + β2, the working rake angle of the third ball head cutting edge 6 is γ = γ1 + γ2; and the working rake angle of the fourth ball head cutting edge 7 is δ = δ1 + δ2.

[0133] Wherein, the working rake angle α of the first ball head cutting edge 4 is set to be smaller to bear the main impact and protect the second ball head cutting edge 5, and the value of α is determined by the hardness of the cast cabin material and the cutting depth of the first ball head cutting edge 4; the working rake angle β of the second ball head cutting edge 5 is greater than α, i.e. α < β, to improve the sharpness and thus improve the overall processing efficiency;

[0134] Wherein, the working rake angle γ of the third ball head cutting edge 6 is set to be between β and α, i.e. α < γ < β, to bear the main impact and protect the fourth ball head cutting edge 7; the working rake angle δ of the fourth ball head cutting edge 7 is greater than β, i.e. δ > β, to improve the sharpness and thus improve the overall processing efficiency.

[0135] Wherein, after the values of α, β, γ and δ are determined, the values of α, β, γ and δ are adjusted by adjusting the inclination of the bottom surface of the first installation groove, the second installation groove, the third installation groove and the fourth installation groove and the self rake angle fixed value of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7.

[0136] Specifically, the working rake angle α of the first ball head cutting edge 4 satisfies:

[0137]

[0138] Wherein, K α is a correction coefficient, and the value range is 16.9-25.9;

[0139] H Ⅰ is the material hardness of the first ball head cutting edge 4;

[0140] H 钛合金 is the material hardness of the titanium alloy cast cabin 16;

[0141] a is the cutting depth of the first ball head cutting edge 4.

[0142] Specifically, the working rake angle β of the second ball head cutting edge 5 satisfies:

[0143]

[0144] wherein K β is a correction coefficient, and has a value ranging from 13.1 to 25.0;

[0145] H Ⅱ is the material hardness of the second ball-nose cutting edge 5;

[0146] H 钛合金 is the hardness of the titanium alloy cast cabin 16 material;

[0147] b is the depth of cut of the second ball-nose cutting edge 5.

[0148] Specifically, the working rake angle γ of the third ball-nose cutting edge 6 satisfies:

[0149]

[0150] wherein K γ is a correction coefficient, and has a value ranging from 14.2 to 25.3;

[0151] H Ⅲ is the material hardness of the third ball-nose cutting edge 6;

[0152] H 钛合金 is the hardness of the titanium alloy cast cabin 16 material;

[0153] c is the depth of cut of the third ball-nose cutting edge 6.

[0154] Specifically, the working rake angle δ of the fourth ball-nose cutting edge 7 satisfies:

[0155]

[0156] wherein K δ is a correction coefficient, and has a value ranging from 12.5 to 19.6;

[0157] H Ⅳ is the material hardness of the fourth ball-nose cutting edge 7;

[0158] H 钛合金 is the hardness of the titanium alloy cast cabin material;

[0159] d is the depth of cut of the fourth ball-nose cutting edge 7.

[0160] Exemplarily, K α is 20.33, H Ⅰ is RHC70, H 钛合金 is RHC30, a is 1 mm, and in this case, α = -1.5°.

[0161] Exemplarily, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6, and the fourth ball-nose cutting edge 7 have the same shape size and material as the first ball-nose cutting edge 4, and in this case, H Ⅰ= H Ⅱ = H Ⅲ = H Ⅳ = RHC70; wherein, K β = 16.48, b = 1.2mm, and β = 1°; wherein, K γ = 18.08, c = 1.1mm, and γ = 0.5°; wherein, K δ = 12.59, d = 1.5mm, and δ = 5°.

[0162] Specifically, the fixed rake angles of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7 are determined by the shape of the ball nose cutting edge itself. For example, the shapes of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7 are the same. In this case, the fixed rake angles of the four ball nose cutting edges are α1= β1= γ1= δ1, and specifically, α1= β1= γ1= δ1= 1.5°. Thus, the installation rake angles of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7 can be calculated according to the formula α = α1+ α2, β = β1+ β2, γ = γ1+ γ2, and δ = δ1+ δ2. Specifically, the installation rake angle of the first ball nose cutting edge 4 is α2= α- α1= -1.5°- 1.5°= -3°, the installation rake angle of the second ball nose cutting edge 5 is β2= β- β1= 1°- 1.5°= -0.5°, the installation rake angle of the third ball nose cutting edge 6 is γ2= γ- γ1= 0.5°- 1.5°= -1°, and the installation rake angle of the fourth ball nose cutting edge 7 is δ2= δ- δ1= 5°- 1.5°= 3.5°.

[0163] After the installation rake angles of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7 are determined, the inclination of the bottom surface in the first installation slot, the second installation slot, the third installation slot and the fourth installation slot is set respectively. The bottom surface is the surface in contact with the installation surface of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 or the fourth ball nose cutting edge 7. The inclination of the bottom surface is the same as the installation rake angle of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 or the fourth ball nose cutting edge 7. Thus, the installation rake angles of the first ball nose cutting edge 4, the second ball nose cutting edge 5, the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7 can be adjusted.

[0164] Specifically, as Figure 8As shown, the first carrier 2 is composed of an upper part and a lower part, the upper part is installed in the rectangular through slot 101 in the tool holder 1, and the lower part is screwed at the lower end of the upper part for easy replacement; the lower part of the first carrier 2 is provided with a first auxiliary carrier 8 through the installation of a mounting screw 10, and the first auxiliary carrier 8 and the lower part of the first carrier 2 are provided with a first installation slot and a second installation slot for installing the first ball head cutting edge 4 and the second ball head cutting edge 5, respectively, as shown in the figure Figure 3 As shown, the inclination of the bottom surface of the first installation slot is α2, and the inclination of the bottom surface is processed when the lower part of the first auxiliary carrier 8 is processed, so as to adjust the working rake angle of the first ball head cutting edge 4. The second installation slot is the same as the first installation slot, and the difference is that the inclination of the bottom surface of the second installation slot is β2.

[0165] Specifically, the second auxiliary carrier 9 and the second carrier 3 are the same structure as the first auxiliary carrier 8 and the second carrier 3, respectively, and the difference is that the inclination of the bottom surface of the third installation slot and the fourth installation slot respectively provided at the lower end of the second auxiliary carrier 9 and the second carrier 3, wherein the inclination of the bottom surface of the third installation slot is γ2, and the inclination of the bottom surface of the fourth installation slot is δ2.

[0166] Considering that the gap between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 is small, for example, R2=R1=3mm, R3=R4=8mm; In the process of cutting, the existing cutting fluid feeding mode may not be able to feed into the gap, and the end face of the gap between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 cannot be cooled, in addition, the debris will also enter the gap between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7, and may accumulate in the gap, and the more debris accumulated will wear the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7, reducing the service life.

[0167] To solve the above problems, a cleaning device can be provided to cool, lubricate and remove residual metal debris between the gaps between the adjacent surfaces of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 during cutting.

[0168] Specifically, the cleaning device includes a first channel 14 and a second channel 15 provided on the first carrier 2 for gas and liquid flow, the gas outlet of the first channel 14 and the liquid outlet of the second channel 15 are located in the gap between the adjacent surfaces of the first ball head cutting edge 4 and the second ball head cutting edge 5, and are arranged towards the gap between the third ball head cutting edge 6 and the fourth ball head cutting edge 7.

[0169] In order to improve the flow rate of the cutting fluid sprayed by the second channel 15 to clean the chips adhered to the adjacent edge gaps of the first ball-nose cutting edge 4, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7, the application uses the sprayed gas to improve the flow rate of the cutting fluid to improve the cleaning efficiency of the chips, and at the same time, the air flow on the surface of the first ball-nose cutting edge 4, the second ball-nose cutting edge 5, the third ball-nose cutting edge 6 and the fourth ball-nose cutting edge 7 is accelerated to improve the cooling effect of the multi-point cutting tool.

[0170] Specifically, along the cutting direction, the liquid spraying port of the second channel 15 is arranged above the air spraying port of the first channel 14. The first channel 14 is used to flow air or nitrogen, and the second channel 15 is used to flow cutting fluid. The diameter of the air spraying port of the first channel 14 is x1, and the diameter of the liquid spraying port of the second channel 15 is x2, wherein 1 / 3*R1

[0171] In order to realize the stable spraying of the first channel 14 and the stable spraying of the second channel 15, the application provides a gas supply device and a liquid supply device outside the first carrier 2. Specifically, the air inlet end of the first channel 14 is in communication with the gas supply device arranged outside the first carrier 2, and the gas supply device includes a gas conveying pipe for conveying air or nitrogen into the first channel 14. The liquid inlet of the second channel 15 is in communication with the liquid supply device, and the liquid supply device includes a liquid conveying pipe for conveying cutting fluid into the second channel 15.

[0172] In order to better use the above-mentioned multi-point cutting tool for cutting work, the application further provides a titanium alloy cabin 16 inner cavity processing device, which comprises the above-mentioned multi-point cutting tool and a driving device for controlling the moving state of the multi-point cutting tool. The driving device comprises a tool bar 23 fixedly connected with the tool holder 1 and a machine tool assembly for driving the tool bar 23 to move, so as to realize the axial movement of the multi-point cutting tool in the inner cavity of the titanium alloy cabin 16 and the adjustment of the distance between the multi-point cutting tool and the inner cavity of the titanium alloy cabin 16.

[0173] Specifically, as shown in Figure 12As shown, the machining device includes a multi-cutting-point tool, and further includes a tool bar 23 fixedly connected to the tool holder 1 at one end, and fixedly arranged in a base 24 at the other end. The base 24 is installed on a machine tool Z-axis support plate. In this way, the base 24 drives the tool bar 23 to move through the control of the machine tool Z-axis support plate, and then drives the multi-cutting-point tool to move in the direction of the Z-axis support plate movement, so as to perform a cutting operation.

[0174] Specifically, the parameters of the tool bar 23 satisfy:

[0175] Diameter E = 0.35 * E1;

[0176] Length L = L1 + 5;

[0177] Strength coefficient

[0178] Wherein, E1 is the diameter of the inner cavity of the titanium alloy casting cabin 16;

[0179] L1 is the depth of the inner cavity of the titanium alloy casting cabin 16.

[0180] For example, E1 = 760 mm, L1 = 920 mm, so, It can be seen that t ≤ 5, which belongs to a high-strength system, and the strength of the tool bar 23 can meet the cutting demand.

[0181] In order to improve the stability of the cutting process, a clamping tool is also provided. The clamping tool includes two clamping parts for fixing the titanium alloy casting cabin 16, so as to axially clamp the titanium alloy casting cabin 16, so as to ensure the stability of the titanium alloy casting cabin 16 during cutting, and thus improve the cutting efficiency.

[0182] Specifically, the clamping tool includes an upper ring 25 and a lower ring 26 fixedly connected to the upper ring 25 through a screw rod 27. The upper ring 25 is fixed to the end face of the machine tool chuck and is used to place the titanium alloy casting cabin 16. The lower ring 26 is fixedly connected to the upper ring 25 through the screw rod 27 and clamps the titanium alloy casting cabin 16 between the upper ring 25 and the lower ring 26, so as to axially compress the titanium alloy casting cabin 26. In this way, the clamping force is concentrated in the axial direction through the clamping tool, the radial force of the titanium alloy casting cabin 16 is reduced, the clamping deformation of the titanium alloy casting cabin 16 is greatly reduced, and the stable cutting control of the titanium alloy casting cabin 16 is improved.

[0183] In order to further improve the stability of the clamping of the titanium alloy casting cabin 16, a stop opening with a clearance of 0.1 mm from the outer shape of the titanium alloy casting cabin 16 is arranged on the upper ring 25 and the lower ring 26, so as to limit the five degrees of freedom of the titanium alloy casting cabin 16 in X, Y, Z, A and B directions.

[0184] Specifically, in order to facilitate the clamping of the titanium alloy casting cabin 16, the parameters of the upper ring 25 satisfy:

[0185] Inner diameter j1 = 0.9E1;

[0186] Outer diameter j2 = 1.2E1.

[0187] The parameters of the lower ring 26 satisfy:

[0188] Inner diameter j3 = 0.97E1;

[0189] Outer diameter j4 = 1.2E1.

[0190] The parameters of the screw rod 27 satisfy:

[0191] Length g = 1.1L1.

[0192] Specifically, four screw rods 27 are uniformly arranged between the upper ring 25 and the lower ring 26. The two ends of the screw rod 27 are provided with a matching nut, and the upper ring 25 and the lower ring 26 are fixed by cooperation of the screw rod 27 and the nut. Exemplarily, the nut is a GBT6170 nut M20, and the nut is fastened by using a torque wrench.

[0193] The torque value M of the torque wrench is set to 45±3N·m, and in the process of fastening the nut by using the torque wrench, the torque wrench emits a "click" sound after reaching the set torque value, and the pressing torque f1 of the nut satisfies:

[0194]

[0195] Wherein, T 扭矩 =M=45±3N·m;

[0196] K 扭矩 is the torque coefficient corresponding to the nut, which is 0.15;

[0197] d 螺杆 is the diameter of the screw rod 27 and the nut cooperation end, which is 0.020m;

[0198] At this time, The total pressing force f 总 of the four nuts on the lower ring 26 is 60-64KN.

[0199] Exemplarily, the turning force f 车削 is measured by using a resistance type dynamometer, and in the turning process, f 车削 is always less than 55KN, which intuitively shows that the titanium alloy casting cabin 16 is always in a stable clamping state during processing.

[0200] Exemplary, the titanium alloy casting cabin 16 shape size is measured by laser scanner or dial gauge method, before clamping, the titanium alloy casting cabin 16 inner diameter depth is L1=1m;After clamping, the titanium alloy casting cabin 16 inner diameter depth is L2=1.02m;L2-L1=0.02<0.05, it can be seen that in the process of turning, the mechanical properties of the clamping tool meet the requirements, at the same time, the clamping causes the titanium alloy casting cabin 16 deformation to be small, meet the processing requirement.

[0201] In order to further improve the service life of the multi-point cutting tool, a cutting fluid feeding device is further provided, which comprises a cutting fluid conveying pipe for conveying cutting fluid, and is arranged along the cutting advancing direction to cool, lubricate and remove large chips at the spherical head surfaces of the first spherical head cutting edge 4 and the third spherical head cutting edge 6, and to cool, lubricate and remove debris at the two side end surfaces of the first spherical head cutting edge 4, the second spherical head cutting edge 5, the third spherical head cutting edge 6 and the fourth spherical head cutting edge 7.

[0202] Specifically, along the rake angle advancing direction, the outlet of the cutting fluid conveying pipe is arranged opposite to the gap between the cutting surfaces of the first spherical head cutting edge 4 and the third spherical head cutting edge 6. The diameter X3 of the outlet of the cutting fluid conveying pipe is 5 / 4D, and the flow rate of the cutting fluid at the outlet is 0.2-0.3m / s. During cutting, the cutting fluid contacts the spherical head surfaces of the first spherical head cutting edge 4 and the third spherical head cutting edge 6, and then flows downward through the side ends of the first spherical head cutting edge 4 and the third spherical head cutting edge 6 to the side end surfaces of the second spherical head cutting edge 5 and the fourth spherical head cutting edge 7. In addition, a small part of the cutting fluid flows to the gap between the adjacent surfaces of the first spherical head cutting edge 4, the third spherical head cutting edge 6, the second spherical head cutting edge 5 and the fourth spherical head cutting edge 7.

[0203] In order to realize stable spraying of the cutting fluid by the cutting fluid conveying pipe, the cutting fluid feeding device comprises a cutting fluid storage device for conveying cutting fluid into the cutting fluid conveying pipe, so as to stably convey cutting fluid into the cutting fluid conveying pipe.

[0204] During operation, the titanium alloy casting cabin 16 is driven to rotate at a speed of 29-37r / min by the clamping tool; the base 24 is driven to move by the machine tool Z-axis support plate, and then the multi-point cutting tool is driven to move in the direction of movement of the Z-axis support plate, so as to realize axial feed of the multi-point cutting tool at a speed of 0.1-0.2mm / r; along the cutting advancing direction, the spherical head surfaces of the first spherical head cutting edge 4, the second spherical head cutting edge 5, the third spherical head cutting edge 6 and the fourth spherical head cutting edge 7 are cooled, lubricated and debris-removed by the cutting fluid feeding device, so as to realize all-round cooling, lubrication and debris-removal of the first spherical head cutting edge 4, the second spherical head cutting edge 5, the third spherical head cutting edge 6 and the fourth spherical head cutting edge 7 in cooperation with the cleaning device.

[0205] In addition, the application also provides a titanium alloy cabin inner cavity processing method, comprising: cutting the titanium alloy cabin 16 inner cavity simultaneously by using the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7; during cutting, the lower edges of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are not flush, and along the cutting direction, the first ball head cutting edge 4 and the third ball head cutting edge 6, and the second ball head cutting edge 5 and the fourth ball head cutting edge 7 are arranged flush respectively. Thus, the problem that the tool is impacted frequently by the part and the tool is broken or worn quickly is solved, and the cutting processing efficiency is improved. The specific steps are as follows.

[0206] Step 1: clamp the titanium alloy cabin 16 in the axial direction by using the clamping tool.

[0207] Specifically, the upper ring 25 is fixed on the end face of the machine tool chuck, and one end of the titanium alloy cabin 16 is placed in the stopper of the upper ring 25; then the lower ring 26 is clamped on the other end face of the titanium alloy cabin 16, and the lower ring 26 is fixedly connected with the upper ring 25 through the cooperation of the screw rod 27 and the nut, so as to limit the five degrees of freedom of the titanium alloy cabin 16 in X, Y, Z, A and B directions, improve the stability of the titanium alloy cabin 16, and realize that the clamping force is concentrated in the axial direction, reduce the radial stress of the titanium alloy cabin 16, and greatly reduce the clamping deformation of the titanium alloy cabin 16.

[0208] Step 2: connect the multi-point cutting tool with the device for controlling the axial feed or axial feed.

[0209] Specifically, the tool holder 1 of the multi-point cutting tool is fixedly connected with the tool rod 23, and the other end of the tool rod 23 is fixedly arranged in the base 24, and the base 24 is installed on the Z-axis support plate of the machine tool. In this way, the base 24 drives the tool rod 23 to move through the control of the Z-axis support plate of the machine tool, and then drives the multi-point cutting tool to move in the moving direction of the Z-axis support plate, so as to perform cutting operation.

[0210] Step 3: set the tool position, and adjust the distance between the lower edges of the second ball head cutting edge 5 and the third ball head cutting edge 6 to be c along the cutting direction.

[0211] Specifically, the horizontal line parallel to the machine tool is taken as the X axis, the vertical line perpendicular to the X axis is taken as the Y axis, the center of one end of the titanium alloy cabin 16 is taken as the zero point, and the face parallel to the inner cavity port of the top of the titanium alloy cabin 16 is taken as the coordinate axis face. In this coordinate system, the tool position is at the lower left 45° position of the inner cavity port of the titanium alloy cabin 16, that is, the position of-135°. In this way, it is convenient to clean the cutting chips at the first ball head cutting edge 4 and the second ball head cutting edge 5, and it is convenient for the cutting fluid feeding device to feed liquid from the ball head face of the two ball head cutting edges, the residence time of the cutting fluid on the surface of the two ball head cutting edges is increased, and the utilization efficiency of the cutting fluid is improved.

[0212] Specifically, the first carrier 2 and the second carrier 3 are adjusted to be perpendicular to the end face of the tool position by the machine tool; the depth adjustment gear 11 is rotated clockwise, and the rotating time is t1. So that the distance between the lower edges of the second ball head cutting edge 5 and the third ball head cutting edge 6 is c.

[0213] Step 4: Adjust the state of the titanium alloy casting cabin 16, and move the multi-point cutting tool to the tool position.

[0214] Specifically, the inner cavity of the titanium alloy casting cabin 16 is counterclockwise rotated by counterclockwise rotating the chuck controlled by the machine tool; and the multi-point cutting tool is moved to the tool position by moving the tool bar 23 controlled by the Z-axis support plate.

[0215] Step 5: The inner cavity of the titanium alloy casting cabin 16 is cut by the multi-point cutting tool.

[0216] Specifically, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are used to cut the inner cavity of the titanium alloy casting cabin 16 synchronously; during cutting, the lower edges of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are not flush, and along the cutting direction, the first ball head cutting edge 4 and the third ball head cutting edge 6, and the second ball head cutting edge 5 and the fourth ball head cutting edge 7 are respectively flush; during cutting, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are axially fed or axially withdrawn along the inner cavity of the titanium alloy casting cabin 16.

[0217] Wherein, when the inner cavity of the titanium alloy casting cabin 16 is initially machined, the first ball head cutting edge 4 cuts the inner cavity of the titanium alloy casting cabin 16 first, then the second ball head cutting edge 5 cuts synchronously on the previous machining track formed by the first ball head cutting edge 4, at this time, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are in idle state. During machining, the titanium alloy casting cabin 16 rotates at a speed of v2=29-37r / min, and after a period of time Then, the tool is axially advanced, at this time, the multi-point cutting tool is axially fed at a speed of 0.1-0.2mm / r, in this process, the third ball head cutting edge 6 cuts on the previous machining track formed by the second ball head cutting edge 5, then the fourth ball head cutting edge 7 cuts synchronously on the previous machining track formed by the third ball head cutting edge 6, at this time, the machine tool runs a machining track with a cutting depth Y=a+b+c+d, which greatly improves the machining efficiency.

[0218] Wherein, in the initial state, the irregular rib of the inner cavity of the titanium alloy casting cabin 16 has irregular machining allowance, the first ball head cutting edge 4 bears the impact of the irregular rib with a small working rake angle to protect the other three ball head cutting edges; the third ball head cutting edge 6 mainly bears the impact of the uniform machining allowance rib with a small working rake angle to protect the fourth ball head cutting edge 7; the second ball head cutting edge 5 and the fourth ball head cutting edge 7 have a large working rake angle to improve the sharpness during cutting, so as to improve the overall machining efficiency and service life of the multi-point cutting tool.

[0219] Wherein, when the first ball head cutting edge 4 moves axially to the inner cavity at the bottom of the titanium alloy casting cabin 16, the distance between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 and the inner cavity of the titanium alloy casting cabin 16 is adjusted by the cutting depth adjusting mechanism to process the inner cavity at the bottom of the titanium alloy casting cabin 16. Specifically, rotate the cutting depth adjusting gear 11 counterclockwise, the rotation time of the cutting depth adjusting gear 11 is t1. At this time, the first ball head cutting edge 4 and the second ball head cutting edge 5 continue to cut, and the cutting depth of each is v1*t3; after a period of time t4=t2, continue to rotate the cutting depth adjusting gear 11 counterclockwise, the rotation time of the cutting depth adjusting gear 11 is t2. At this time, the first ball head cutting edge 4 and the second ball head cutting edge 5 continue to cut, and the cutting depth of each is v1*t5; in this way, the first ball head cutting edge 4 and the second ball head cutting edge 5 are used to cut the inner cavity position at the bottom of the titanium alloy casting 16, and finally the surface processed by the second ball head cutting edge 5 is flush with the surface processed by the fourth ball head cutting edge 7. After processing, the multi-point cutting tool is removed from the titanium alloy casting cabin 16 by the Z-axis support plate control tool bar 23.

[0220] Step 6: During cutting, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are cooled, lubricated and debris is removed in the direction of cutting advancement.

[0221] Specifically, during cutting, the cutting fluid feeding device sprays cutting fluid to the ball head surface of the first ball head cutting edge 4 and the third ball head cutting edge 6 to cool, lubricate and remove large cutting from the outside of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7; at the same time, the gas supply device and the liquid supply device are started to cool, lubricate and remove fine debris from the gap between the adjacent surfaces of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7.

[0222] The jet of the cutting fluid conveying pipe is always directed to the end of the first ball head cutting edge 4 and the third ball head cutting edge 6 to spray the cutting fluid, the cutting fluid coats the first ball head cutting edge 4 and the third ball head cutting edge 6 in the process of flowing downward, and then contacts the side end face of the second ball head cutting edge 5 and the fourth ball head cutting edge 7. Since the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6 is small, for example, 3mm, a small amount of cutting fluid flows into the gap between the adjacent faces of the first ball head cutting edge 4 and the third ball head cutting edge 6 at a low speed; and part of the cutting fluid flows to the junction of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6, the fourth ball head cutting edge 7 and the inner wall of the titanium alloy casting cabin 16, limits the flying of the chips, and cools the inner cavity of the titanium alloy casting cabin 11 at the junction. In this way, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are cooled, lubricated and chip-removed.

[0223] During cutting, the gas supply device and the liquid supply device are started to cool, lubricate and remove the chips from the gap between the adjacent faces of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7, so as to make up for the poor processing effect of the cutting fluid supplied by the cutting fluid supply device on the gap face between the two ball head cutting edges. Specifically, the second channel 15 on the first carrier 2 sprays cutting fluid toward the second carrier 3, the cutting fluid enters the gap between the second ball head cutting edge 5 and the fourth ball head cutting edge 7 from the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6, and the uniformity of the dispersion of the cutting fluid is improved under the action of the gas sprayed from the first channel 14. The gas and the cutting fluid can blow out the chips remaining in the gap, and the chips are limited by the cutting fluid adhered to the chips; further, part of the cutting fluid moves downward, and part of the cutting fluid moves in a parabolic manner. The pressure at the position of the gas flow is less than the pressure at the outer end face of the first ball head cutting edge 4 and the third ball head cutting edge 6. In this way, the cutting fluid sprayed by the cutting fluid supply device is sucked into the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6, and the cooling effect on the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6 is improved. The high-flow cutting fluid can also remove the residual chips. In this way, the cooling, lubrication and chip-removal effects of the multi-cutting-point tool are further improved.

[0224] Compared with the prior art, the machining tool of the application is a multi-point dislocation tool composed of four ball head cutting edges, that is, the four ball head cutting edges cut synchronously, and the distance difference between the lower edges between the four ball head cutting edges is not equal to 0, so that the cutting depth of one machining track of the machine tool is the sum of the cutting depths of the four ball head cutting edges, and the single cutting efficiency is improved; and the working rake angle combination of the four ball head cutting edges is set as alpha < gamma < beta < delta, so that the overall sharpness of the machining tool is improved under the condition of ensuring the overall impact resistance of the tool, and the machining efficiency is further improved.

[0225] The relative positions of the first bearing body 2 and the second bearing body 3 can be adjusted through the cutting depth adjusting gear, and then the cutting depth of the ball head cutting edge can be accurately adjusted, and the positions of the cutting edges relative to the inner cavity of the titanium alloy casting cabin 16 can be adjusted during machining, so that the inner cavity of the bottom of the titanium alloy casting cabin 16 can be cut to realize the machining of the titanium alloy casting cabin 16 inner cavity in all directions without dead angle, and the machining efficiency is further improved.

[0226] The machining tool of the application has a long service life, and frequent tool replacement is avoided, thereby improving the machining efficiency, and the machining time of a single titanium alloy casting cabin 16 inner cavity can be as low as 3.2h, and the machining efficiency is improved by about 1.7 times compared with the prior art.

[0227] During machining of the titanium alloy casting cabin 16 inner cavity, the four ball head cutting edges share the machining cutting amount, and the machining amount borne by a single cutting edge is reduced, and compared with the prior art, the wear of a single cutting edge is reduced during machining of a single part, and the service life of the tool is improved; and one ball head cutting edge bears the main impact with a smaller working rake angle, and protects the other three ball head cutting edges, that is, the machining allowance of the ribs in the titanium alloy casting cabin 16 inner cavity is uneven in the initial state, the ball head cutting edge is first contacted with the ribs, the ball head cutting edge with a smaller working rake angle has good impact resistance and bears the main impact, and the end face after machining of the ball head cutting edge is a uniform end face, which avoids the phenomenon of local intermittent cutting of the uneven end face, and the impact on the other three ball head cutting edges is reduced, so that the service life of the machining tool is improved.

[0228] In the processing of the inner cavity of the titanium alloy casting cabin 16, the first ball head cutting edge 4 bears the main impact with a small working rake angle in the cutting direction, the second ball head cutting edge 5 behind the first ball head cutting edge 4 bears a smaller impact, and since the two are close, it can be regarded as continuous cutting, further reducing the impact on the second ball head cutting edge 5; since the first ball head cutting edge 4 bears the impact of the uneven rib, further, the third ball head cutting edge 6 avoids the phenomenon of local intermittent cutting of the uneven end face, in the cutting direction, the fourth ball head cutting edge 7 behind the third ball head cutting edge 6 bears a smaller impact, and since the fourth ball head cutting edge 7 is close to the third ball head cutting edge 6, it can be regarded as continuous cutting, further reducing the impact on the fourth ball head cutting edge 7; thereby further improving the service life of the machining tool.

[0229] The cutting fluid and gas spray channels arranged on the first carrier 2 can cool and lubricate the gap between the cutting edges, solve the problem that the existing cutting fluid supply mode may not supply the gap, thereby achieving all-round cooling and lubrication of the cutting edges, and at the same time, the adhesion of debris in the gap between the cutting edges can be removed to avoid friction between the debris and the cutting edges, thereby further improving the service life of the machining tool, and the service life of a single cutting edge is at least 8.7h, which is 17.4-26.1 times higher than that of the prior art.

[0230] The four ball head cutting edges of the present application can all adopt circular edges with the same working rake angle at each angle, so that when the cutting end of the cutting edge is broken, only the circular edge needs to be rotated, and the unbroken part can continue to cut with the original cutting depth and working rake angle, the utilization rate of a single cutting edge is improved, the cost is reduced, and during installation, there is no need to adjust the cutting depth and working rake angle, the installation efficiency is improved, and the overall machining efficiency is further improved.

[0231] Example 1:

[0232] A titanium alloy cabin inner cavity machining multi-cutting point tool, comprising a tool holder 1, a first carrier 2 and a second carrier 3 installed on the tool holder 1, and a first auxiliary carrier 8 and a second auxiliary carrier 9 installed at the lower end of the first carrier 2 and the second carrier 3, respectively, a first mounting groove and a second mounting groove for installing a first ball head cutting edge 4 and a second ball head cutting edge 5 are arranged at the lower end of the first auxiliary carrier 8 and the first carrier 2, respectively, and a third mounting groove and a fourth mounting groove for installing a third ball head cutting edge 6 and a fourth ball head cutting edge 7 are arranged at the lower end of the second auxiliary carrier 9 and the second carrier 3. In the cutting direction, the first ball head cutting edge 4 is flush with the third ball head cutting edge 6 and cuts synchronously, and the second ball head cutting edge 5 is flush with the fourth ball head cutting edge 7 and cuts synchronously.

[0233] Wherein, the first auxiliary carrier 8 and the second auxiliary carrier 9 are installed at the lower end of the first carrier 2 and the second carrier 3 through the installation screw rod 10. One side of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 is screwed in the first installation slot, the second installation slot, the third installation slot and the fourth installation slot respectively, and along the cutting direction, the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 have two opposite faces, one of which is the installation face of the first auxiliary carrier 8, the first carrier 2, the second auxiliary carrier 9 and the second carrier 3, and the other end face is the ball head convex face as the working side, the edge of the convex face is a circular cutting edge, and the diameter of the two circular cutting edges is D, wherein D=12mm.

[0234] Wherein, one end face of the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 is the installation face, which is screwed in the first installation slot, the second installation slot, the third installation slot and the fourth installation slot respectively, and the other end face is the convex face, the end of the convex face is the circular cutting edge, and the middle part of the convex face is provided with a groove, when installation, the head of the screw is located in the groove, and the rod part of the screw is fixedly connected with the first installation slot, the second installation slot, the third installation slot or the fourth installation slot through the installation face.

[0235] Wherein, the cutting depth of the first ball head cutting edge 4 is The working rake angle thereof is The installation rake angle thereof is α2=α-α1=-1.5°-1.5°=-3°;

[0236] Wherein, the cutting depth of the second ball head cutting edge 5 is The working rake angle thereof is The installation rake angle thereof is β2=β-β1=1°-1.5°=-0.5°;

[0237] Wherein, the cutting depth of the third ball head cutting edge 6 is The working rake angle thereof is The installation rake angle thereof is γ2=γ-γ1=0.5°-1.5°=-1°;

[0238] Wherein, the cutting depth of the fourth ball head cutting edge 7 is The working rake angle thereof is The installation rake angle thereof is δ2=δ-δ1=5°-1.5°=3.5°.

[0239] Wherein, the machine tool runs a machining trajectory with a depth of cut Y = a + b + c + d = 4.8mm.

[0240] Wherein, the distance between the lower edges of the first ball head cutting edge 4 and the second ball head cutting edge 5 is C1 = 1.2mm; the distance between the lower edges of the second ball head cutting edge 5 and the third ball head cutting edge 6 is C2 = 1.1mm; the distance between the lower edges of the third ball head cutting edge 6 and the fourth ball head cutting edge 7 is C3 = 1.5mm.

[0241] Wherein, the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6 is R1 = R2 = 1 / 4D = 3mm, wherein R2 is the gap between the second ball head cutting edge 5 and the fourth ball head cutting edge 7;

[0242] Wherein, the gap between the first ball head cutting edge 4 and the second ball head cutting edge 5 is R3 = R4 = 2 / 3D = 8mm, wherein R4 is the gap between the third ball head cutting edge 6 and the fourth ball head cutting edge 7.

[0243] Specifically, the first carrier 2 is composed of an upper part and a lower part, the upper part is installed in the rectangular through slot 101 in the tool holder 1, and the lower part is screwed at the lower end of the upper part, wherein the first auxiliary carrier 8 is installed on the lower part of the first carrier 2 through the mounting screw 10 for easy replacement; the first auxiliary carrier 8 and the lower part of the first carrier 2 are respectively provided with a first mounting slot and a second mounting slot for mounting the first ball head cutting edge 4 and the second ball head cutting edge 5. Wherein, the inclination of the bottom surface of the first mounting slot and the second mounting slot is the same as the installation rake angle of the first ball head cutting edge 4 and the second ball head cutting edge 5 respectively.

[0244] Specifically, the second carrier 2 is composed of an upper part and a lower part, the upper part is installed in the rectangular through slot 101 in the tool holder 1, and the lower part is screwed at the lower end of the upper part, wherein the second auxiliary carrier 9 is installed on the lower part of the second carrier 3 through the mounting screw 10 for easy replacement; the second auxiliary carrier 9 and the lower part of the second carrier 3 are respectively provided with a third mounting slot and a fourth mounting slot for mounting the third ball head cutting edge 6 and the fourth ball head cutting edge 7. Wherein, the inclination of the bottom surface of the third mounting slot and the fourth mounting slot is the same as the installation rake angle of the third ball head cutting edge 6 and the fourth ball head cutting edge 7 respectively.

[0245] The rectangular through slot 101 is provided on the tool holder 1, the inner wall of the rectangular through slot 101 is provided with a plurality of protrusions 102 penetrating the upper and lower end faces of the tool holder 1, the outer surfaces of the first carrier 2 and the second carrier 3 are provided with a plurality of recesses 13 penetrating the upper and lower end faces of the two carriers, one side of the first carrier 2 and the second carrier 3 is inserted into the rectangular through slot 101, the plurality of recesses 13 on the outer surface of the first carrier 2 are embedded in one-to-one correspondence with the plurality of protrusions 102 on the inner wall of the rectangular through slot 101, and the plurality of recesses 13 on the outer surface of the second carrier 3 are embedded in one-to-one correspondence with the plurality of protrusions 102 on the inner wall of the rectangular through slot 101; an adjusting mechanism is arranged in the tool holder 1, the adjusting mechanism comprises a depth adjusting gear 11, one side of the first carrier 2 and the second carrier 3 is respectively provided with a rectangular groove 12, and the rectangular groove 12 of the first carrier 2 and the rectangular groove 12 of the second carrier 3 jointly form an internal chamber accommodating the depth adjusting gear 11; the bottom surface of the rectangular groove 12 is a tooth surface which can be engaged with the depth adjusting gear 11, the adjusting mechanism further comprises a rotating shaft, one end of the rotating shaft is connected with the depth adjusting gear 11, and the other end of the rotating shaft is in transmission connection with a driving assembly arranged on the tool holder 1. The number of rotating shafts can be two, which are arranged at the two ends of the depth adjusting gear 11 respectively. The driving assembly comprises a driving shaft in engagement with one end of the rotating shaft and a driving motor assembly for controlling the rotation of the driving shaft. The two plane end portions of the depth adjusting gear 11 are in sliding connection with the side end faces of the rectangular groove 12.

[0246] In this way, the first carrier 2 and the second carrier 3 are moved up and down in the rectangular through slot 101 of the tool holder 1 through the adjusting mechanism.

[0247] The rectangular groove 12 of the first carrier 2 and the rectangular groove 12 of the second carrier 3 jointly form an internal chamber accommodating the depth adjusting gear 11; the bottom surface of the rectangular groove 12 is a tooth surface which can be engaged with the depth adjusting gear 11, the adjusting mechanism further comprises a rotating shaft, one end of the rotating shaft is connected with the depth adjusting gear 11, and the other end of the rotating shaft is in transmission connection with a driving assembly arranged on the tool holder 1. The number of rotating shafts can be two, which are arranged at the two ends of the depth adjusting gear 11 respectively. The driving assembly comprises a driving shaft in engagement with one end of the rotating shaft and a driving motor assembly for controlling the rotation of the driving shaft. The two plane end portions of the depth adjusting gear 11 are in sliding connection with the side end faces of the rectangular groove 12.

[0248] When the depth needs to be adjusted, the driving assembly is started, and the depth adjusting gear 11 is rotated under the action of the driving assembly. In the initial state, the lower edges of the first ball head cutting edge 4 and the third ball head cutting edge 6 are flush, if the depth adjusting gear 11 is rotated clockwise, the first carrier 2 drives the first ball head cutting edge 4 and the second ball head cutting edge 5 to move away from the inner cavity wall surface of the titanium alloy casting cabin 16, and the second carrier 3 drives the third ball head cutting edge 6 and the fourth ball head cutting edge 7 to move close to the inner cavity wall surface of the titanium alloy casting cabin 16, so as to adjust the distance difference C2 between the end portions of the second ball head cutting edge 5 and the third ball head cutting edge 6.

[0249] Specifically, the cleaning device is arranged on the multi-point cutter, and includes a first channel 14 and a second channel 15 arranged on the first carrier 2 for air and liquid flow. The air outlet of the first channel 14 and the liquid outlet of the second channel 15 are located in the gap between the adjacent surfaces of the first ball nose cutting edge 4 and the second ball nose cutting edge 5, and are arranged towards the gap between the third ball nose cutting edge 6 and the fourth ball nose cutting edge 7.

[0250] Wherein, along the cutting direction, the liquid outlet of the second channel 15 is arranged above the air outlet of the first channel 14. The first channel 14 is used for air flow, and the second channel 15 is used for cutting fluid flow.

[0251] Wherein, the air inlet of the first channel 14 is communicated with the air supply device arranged outside the first carrier 2, and the air supply device includes an air pipe for conveying air or nitrogen into the first channel 14. The liquid inlet of the second channel 15 is communicated with the liquid supply device, and the liquid supply device includes a liquid pipe for conveying cutting fluid into the second channel 15.

[0252] Wherein, the diameter of the air outlet of the first channel 14 is x1 = 1.4mm, and the air outlet rate is 10m / s.

[0253] The diameter of the liquid outlet of the second channel 15 is x2 = 1.4mm, and the liquid outlet rate is 0.3m / s.

[0254] When the multi-point cutter is used for machining, the tool holder 1 is first fixedly connected to the tool bar 23, and the other end of the tool bar 23 is fixedly arranged in the base 24, and the base 24 is installed on the Z-axis supporting plate of the machine tool. Wherein, the diameter of the tool bar 23 is E = 0.35*E1 = 0.35*760 = 266mm; the length of the tool bar 23 is L = L1 + 5 = 920 + 5 = 925mm.

[0255] Then, the titanium alloy casting cabin 16 is axially fixed by a clamping tool, and then the chuck is controlled to rotate at 34 r / min to drive the clamping tool to rotate. The clamping tool includes an upper ring 25 and a lower ring 26 fixedly connected with the upper ring 25 through a screw rod 27. The upper ring 25 and the lower ring 26 are provided with a stop opening with a gap of 0.1 mm from the outer shape of the titanium alloy casting cabin 16 to limit the five degrees of freedom of the titanium alloy casting cabin 16 in X, Y, Z, A and B directions. The upper ring 25 is fixed on the end face of the machine tool chuck and is used to place the titanium alloy casting cabin 16. The lower ring 26 is fixedly connected with the upper ring 25 through the screw rod 27 and clamps the titanium alloy casting cabin 16 between the upper ring 25 and the lower ring 26 to axially press the titanium alloy casting cabin 16. The inner diameter j1 of the upper ring 25 is 0.9E1=684 mm, and the outer diameter j2 of the upper ring 25 is 1.2E1=912 mm. The inner diameter j3 of the lower ring 26 is 0.97E1=737.2 mm, and the outer diameter j4 of the lower ring 26 is 1.2E1=912 mm. The length g of the screw rod 27 is 1.1L1=1012 mm. The screw rod 27 is provided with a matching nut at both ends, and the upper ring 25 and the lower ring 26 are fixed by cooperation of the screw rod 27 and the nut. The nut is GBT6170 nut M20, and a torque wrench with a torque value M set to 45±3 N·m is used to tighten the nut. The clamping torque of the nut is f1=15KN, and the total clamping torque of the four nuts is f2=60~64KN. The total clamping torque of the four nuts on the lower ring 26 is f 总 =4f1=60~64KN.

[0256] Then, the machine tool is used to adjust the multi-point cutting tool to a given position, which is located at the lower left side of the titanium alloy casting cabin 16 at an angle of 45°. The tool holder 23 is rotated to adjust the inclination angle of the tool holder 1, so that the first carrier 2 and the second carrier 3 are perpendicular to the end face of the given position. The depth adjustment gear 11 is rotated clockwise, and the rotation time The distance between the lower edges of the second ball head cutting edge 5 and the third ball head cutting edge 6 is 1.1 mm.

[0257] Then, the chuck is controlled to rotate counterclockwise at a speed of 34 r / min to drive the inner cavity of the titanium alloy casting cabin 16 to rotate counterclockwise, and the Z-axis support plate is used to control the movement of the tool holder 23 to move the multi-point cutting tool to the given position.

[0258] Finally, the titanium alloy casting cabin 16 is turned by using the above multi-point cutting tool.

[0259] Specifically, when machining the inner cavity of the titanium alloy casting cabin 16, the first ball head cutting edge 4 first cuts the inner cavity of the titanium alloy casting cabin 16, then the second ball head cutting edge 5 synchronously cuts on the previous machining track formed by the first ball head cutting edge 4, at this time, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 are in an idle state. When machining, the titanium alloy casting cabin 16 rotates at a speed of v2=34r / min, and after a period of time , the cutter is axially advanced, at this time, the multi-point cutter is axially advanced at a speed of 0.1mm / r, in this process, the third ball head cutting edge 6 cuts on the previous machining track formed by the second ball head cutting edge 5, then the fourth ball head cutting edge 7 synchronously cuts on the previous machining track formed by the third ball head cutting edge 6, at this time, the machine tool runs a machining track with a cutting depth Y=a+b+c+d=4.8mm.

[0260] Wherein, when the first ball head cutting edge 4 is axially moved to the inner cavity at the bottom of the titanium alloy casting cabin 16, the distance between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7 and the inner cavity of the titanium alloy casting cabin 16 is adjusted by using the cutting depth adjusting mechanism to machine the inner cavity at the bottom of the titanium alloy casting cabin 16. Specifically, the cutting depth adjusting gear 11 is counterclockwise rotated, the rotation time of the cutting depth adjusting gear 11 is At this time, the first ball head cutting edge 4 and the second ball head cutting edge 5 continue to cut, and the cutting depth of each is v1*t3; after a period of time t4=t2, the cutting depth adjusting gear 11 is continuously counterclockwise rotated, the rotation time of the cutting depth adjusting gear 11 is At this time, the first ball head cutting edge 4 and the second ball head cutting edge 5 continue to cut, and the cutting depth of each is v1*t5; in this way, the inner cavity position at the bottom of the titanium alloy casting 16 is machined by the first ball head cutting edge 4 and the second ball head cutting edge 5, finally, the surface machined by the second ball head cutting edge 5 is flush with the surface machined by the fourth ball head cutting edge 7. After machining, the multi-point cutter is moved out of the titanium alloy casting cabin 16 by the Z-axis support plate control cutter bar 23.

[0261] If one machining cutting depth is less than the machining allowance, the position of the cutter bar 23 is adjusted by the machine tool to adjust the cutting depth of the second ball head cutting edge 5, so as to cut the remaining machining allowance by the second ball head cutting edge 5; the multi-point cutter is axially advanced by the Z-axis support plate control cutter bar 23 to realize reciprocating cutting. If one machining cutting is greater than the machining allowance, the cutting depth of the third ball head cutting edge 6 is finely adjusted by the cutting depth adjusting gear 11 to realize the machining of the titanium alloy casting cabin 16.

[0262] Specifically, in the process of cutting, the cutting fluid feeding device is used to cool, lubricate and remove the debris of the multi-point cutting tool; wherein the diameter of the liquid outlet X3 = 5 / 4D = 15mm, and the cutting fluid flow rate at the liquid outlet is 0.3m / s. At the same time, the gas supply device and the liquid supply device are started to cool, lubricate and remove the debris at the gap between the first ball head cutting edge 4, the second ball head cutting edge 5, the third ball head cutting edge 6 and the fourth ball head cutting edge 7. Specifically, the cutting fluid sprayed by the cutting fluid feeding device can only enter the gap in a small flow rate and a small amount, at this time, the second channel 15 on the first carrier 2 sprays cutting fluid towards the second carrier 3, the cutting fluid enters the gap between the second ball head cutting edge 5 and the fourth ball head cutting edge 7 from the gap between the first ball head cutting edge 4 and the third ball head cutting edge 6, under the action of the gas sprayed by the first channel 14, the uniformity of the dispersion of the cutting fluid is improved, and the gas carrying the cutting fluid can blow out the debris remaining in the gap, and the cutting fluid adhered to the debris can position the debris.

[0263] Using this method for machining, the single-piece machining time is 3.2h, the service life of the first ball head cutting edge 4 is 8.7h, the service life of the second ball head cutting edge 5 is 14.5h, the service life of the third ball head cutting edge 6 is 9.1h, and the service life of the fourth ball head cutting edge 7 is 16h.

[0264] Comparative Example 1

[0265] A titanium alloy cabin inner cavity machining tool, which is different from Example 1 in that

[0266] A carrier is arranged at the fixed end of the tool holder, and a ball head cutting edge is fixedly connected to the lower end of the carrier. The cutting depth a of the ball head cutting edge is fixed at 1mm, the cutting depth of the machine tool running one track is a, and the working rake angle α of the ball head cutting edge is fixed at 1°.

[0267] When the above tool is used for machining, the ball head cutting edge is used to machine the surface to be machined in the titanium alloy cabin inner cavity, which bears the impact of the rib with irregular machining allowance; during machining, the machining tool is axially fed at a speed of 0.1mm / r, and the titanium alloy cabin is rotated at a speed of 34r / min; when the ball head cutting edge moves axially to the vicinity of the upper ring, the position of the Z-axis support plate is adjusted by the machine tool in the Y-axis and X-axis directions, so as to adjust the movement of the ball head cutting edge to the end face of the titanium alloy cabin inner cavity, and the cutting depth is a; the machining tool is moved away from the upper ring by the Z-axis support plate, and the reciprocating cutting is performed; after the tool bar moves 5 times, that is, the total cutting depth of the machining track is 5a, the cutting task is completed; wherein, the cutting fluid feeding device is used to cool, lubricate and remove the debris of the ball head cutting edge during cutting.

[0268] The machining tool is used to machine the inner cavity of the titanium alloy casting cabin, and the machining time of a single piece is 8.5 hours, and the service life of the ball head cutting edge is 20-30 minutes.

[0269] Compared with the comparative example 1, the machining efficiency, tool service life and manual participation rate are obviously improved.

[0270] Table 1 machining effect of examples 1-6 and comparative example 1

[0271]

[0272]

[0273] As shown in Table 1, the machining time of a single piece in the application is 3.2 hours, which is much lower than the machining time 8.5 hours of a single piece in the comparative example 1, so it can be seen that the multi-cutting-point tool can obviously improve the machining efficiency.

[0274] In the machining process, the continuous machining time of the tool edge of the application is not less than 8.7 hours, and the highest can reach 16 hours, which is much higher than the continuous machining time 20-30 minutes of the tool edge in the comparative example 1, so it can be seen that the multi-cutting-point tool can obviously improve the service life of the tool, and the tool does not need to be replaced in the machining process, which improves the machining efficiency and reduces the manual participation rate.

[0275] Therefore, the multi-cutting-point tool is used to intermittently and efficiently turn the inner cavity of the titanium alloy casting cabin, which can effectively solve the problem that the tool is frequently impacted by the parts, leading to rapid collapse or wear of the tool, and can effectively improve the cutting machining efficiency.

[0276] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A multi-point cutter for machining titanium alloy pod cavities, characterized by: The tool comprises a tool holder, a first carrier and a second carrier mounted on the tool holder, and at least one ball nose cutting edge mounted on the lower end of the first carrier and at least two ball nose cutting edges mounted on the lower end of the second carrier; In the cutting direction, the ball nose cutting edge on the lower end of the first carrier is flush with any one of the ball nose cutting edges on the lower end of the second carrier, and all the ball nose cutting edges cut synchronously; The lower edges of all the ball nose cutting edges are not flush; The lower end of the first carrier is provided with a first mounting groove and a second mounting groove for mounting the first ball nose cutting edge and the second ball nose cutting edge respectively; The inclination of the bottom surface of the first mounting groove and the fixed value of the rake angle of the first ball nose cutting edge are equal to the working rake angle of the first ball nose cutting edge; The inclination of the bottom surface of the second mounting groove and the fixed value of the rake angle of the second ball nose cutting edge are equal to the working rake angle of the second ball nose cutting edge; The lower end of the second carrier is provided with a third mounting groove and a fourth mounting groove for mounting the third ball nose cutting edge and the fourth ball nose cutting edge respectively; The inclination of the bottom surface of the third mounting groove and the fixed value of the rake angle of the third ball nose cutting edge are equal to the working rake angle of the third ball nose cutting edge; The inclination of the bottom surface of the fourth mounting groove and the fixed value of the rake angle of the fourth ball nose cutting edge are equal to the working rake angle of the fourth ball nose cutting edge; The working rake angles of the first ball nose cutting edge, the second ball nose cutting edge, the third ball nose cutting edge and the fourth ball nose cutting edge satisfy the following conditions: α < γ < β < δ; In the cutting process, the tool cuts along the circumference of the inner cavity of the titanium alloy casting cabin and advances axially along the axis of the inner cavity of the titanium alloy casting cabin. After cutting along the circumference of the inner cavity of the titanium alloy casting cabin for one turn, a circumferential machining track is formed. The second ball nose cutting edge cuts on the previous machining track formed by the first ball nose cutting edge, the third ball nose cutting edge cuts on the previous machining track formed by the second ball nose cutting edge, and the fourth ball nose cutting edge cuts on the previous machining track formed by the third ball nose cutting edge.

2. The multi-point tool of claim 1 wherein: The first carrier is provided with the first ball nose cutting edge and the second ball nose cutting edge on the lower end, and the second carrier is provided with the third ball nose cutting edge and the fourth ball nose cutting edge on the lower end; In the cutting direction, the first ball nose cutting edge is flush with the third ball nose cutting edge and cuts synchronously, and the second ball nose cutting edge is flush with the fourth ball nose cutting edge and cuts synchronously; The lower edges of the first ball nose cutting edge, the second ball nose cutting edge, the third ball nose cutting edge and the fourth ball nose cutting edge are not flush.

3. The multi-point tool of claim 2, wherein: In the cutting direction, the first ball nose cutting edge is located at the front end of the second ball nose cutting edge; In the cutting direction, the two side edges of the first ball nose cutting edge and the second ball nose cutting edge are flush, and the two side edges of the third ball nose cutting edge and the fourth ball nose cutting edge are flush.

4. A multi-point cutting tool according to any one of claims 2-3, characterized in that: The distance between the lower edges of the first ball nose cutting edge and the second ball nose cutting edge is equal to the cutting depth of the second ball nose cutting edge; The cutting depth a of the first ball nose cutting edge satisfies the following condition: Wherein, H Ⅰ is the material hardness of the first ball head cutting edge; H 钛合金 is the hardness of the titanium alloy casting cabin material; K a is a correction coefficient, the value range is 3.0-8.9; D is the diameter of the first ball head cutting edge, the value range is 6-12 mm; The cutting depth b of the second ball nose cutting edge satisfies the following condition: Wherein, H Ⅱ H is the material hardness of the second ball head cutting edge; H 钛合金 H is the hardness of the titanium alloy casting cabin material; K b K is a correction coefficient, the value range is 2.5-8.9; D is the diameter of the second ball head cutting edge, the value range is 6-12 mm.

5. The multi-point tool of claim 4, wherein: The distance between the lower edge of the second ball head cutting edge and the third ball head cutting edge is the same as the depth of cut of the third ball head cutting edge; the distance between the lower edge of the third ball head cutting edge and the fourth ball head cutting edge is the same as the depth of cut of the fourth ball head cutting edge; The depth of cut c of the third ball head cutting edge satisfies: wherein H Ⅲ is the material hardness of the third ballnose cutting edge; H 钛合金 is the hardness of the titanium alloy cast cabin material; K c is a correction coefficient, with a value range of 2.6-8.9; and D is the diameter of the third ballnose cutting edge, with a value range of 6-12 mm. The depth of cut d of the fourth ball head cutting edge satisfies: wherein H Ⅳ is the material hardness of the fourth ballnose cutting edge; H 钛合金 is the hardness of the titanium alloy tank material; K d is a correction coefficient, with a value range of 2.4-7.1; and D is the diameter of the fourth ballnose cutting edge, with a value range of 6-12 mm.

6. The multi-point tool of claim 5 wherein: The total depth of cut of the first ball head cutting edge, the second ball head cutting edge, the third ball head cutting edge and the fourth ball head cutting edge is the sum of the depths of cut of the four ball head cutting edges.

7. The multi-point cutting tool of any one of claims 2-3, wherein: The working rake angle a of the first ball head cutting edge satisfies: wherein H Ⅰ is the material hardness of the first ball nose cutting edge; H 钛合金 is the hardness of the titanium alloy cast cabin material; K α is a correction coefficient, with a value range of 16.9-25.9; a is the cutting depth of the first ball nose cutting edge; The working rake angle β of the second ball head cutting edge satisfies: wherein H Ⅱ is the material hardness of the second ballnose cutting edge; H 钛合金 is the hardness of the titanium alloy cast cabin material; K β is a correction coefficient, with a value range of 13.1-25.0; and b is the cutting depth of the second ballnose cutting edge.

8. The multi-point tool of claim 7, wherein: The working rake angle γ of the third ball head cutting edge satisfies: wherein H Ⅲ is the material hardness of the third ballnose cutting edge; H 钛合金 is the hardness of the titanium alloy cast cabin material; K γ is a correction coefficient, with a value range of 14.2-25.3; and c is the cutting depth of the third ballnose cutting edge. The working rake angle δ of the fourth ball head cutting edge satisfies: wherein H Ⅳ is the material hardness of the fourth ballnose cutting edge; H 钛合金 is the hardness of the titanium alloy cast cabin material; K δ is a correction coefficient, with a value range of 12.5-19.6; and d is the cutting depth of the fourth ballnose cutting edge.

9. The multi-point tool of claim 2 wherein: A rectangular through slot is formed on the tool holder, and the first carrier and the second carrier are movably fixedly connected to the tool holder by being inserted into the rectangular through slot.

10. The multi-point tool of claim 2, wherein: The cleaning device is further used to cool, lubricate and remove debris at the gap between the adjacent surfaces of the first ball head cutting edge, the second ball head cutting edge, the third ball head cutting edge and the fourth ball head cutting edge. The cleaning device comprises a first channel and a second channel for gas and liquid flow formed on the first carrier, and the gas outlet of the first channel and the liquid outlet of the second channel are located in the gap between the first ball head cutting edge and the second ball head cutting edge and face the gap between the third ball head cutting edge and the fourth ball head cutting edge.

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