Double-point tool for machining inner cavity of titanium alloy casting cabin

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of turning technology, and in particular to a double-cutting-point tool for machining the inner cavity of a titanium alloy casting chamber. Background Technology

[0002] Titanium alloys are high-performance metallic materials with advantages such as low density and high specific strength, and are widely used in various fields such as aviation, aerospace, and shipbuilding. Large titanium alloy castings have large external dimensions and complex structures, and the parts are characterized by weak rigidity and poor tool accessibility.

[0003] Currently, turning is the common machining method for the inner cavity of large titanium alloy castings. Existing turning tools typically use a single cutting edge, repeatedly turning to complete the machining. However, due to the multiple axial ribs within the part's inner cavity, and the uneven distribution of these ribs with varying machining allowances (typically 3-5mm), "intermittent machining" occurs during the turning of large titanium alloy castings. "Intermittent machining" has always been a major challenge in turning, primarily due to the frequent impact of the part on the tool, leading to rapid tool chipping or wear—a persistent and difficult problem in the industry. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a dual-point cutting tool for machining the inner cavity of a titanium alloy casting chamber, in order to solve the problem of frequent impacts between existing parts and the cutting tool, resulting in rapid chipping or wear of the cutting tool.

[0005] This invention provides a dual-cutting-point tool for machining the inner cavity of a titanium alloy casting chamber, including a tool holder, a first support body and a second support body mounted on the tool holder, a first ball-end cutting edge mounted on the lower end of the first support body and a second ball-end cutting edge mounted on the lower end of the second support body;

[0006] Along the cutting direction, the first ball end cutting edge and the second ball end cutting edge are aligned and cut synchronously;

[0007] The lower edges of the first and second ball-end cutting edges are not flush.

[0008] Based on the further improvements to the aforementioned dual-point cutting tool, the depth of cut 'a' of the first ball-end cutting edge satisfies:

[0009]

[0010] Among them, H Ⅰ H represents the material hardness of the first ball-end cutting edge. 钛合金 The hardness of the titanium alloy casting material; K a The value is a correction factor, ranging from 3.0 to 8.9; D is the diameter of the first ball end cutting edge, ranging from 6 to 12 mm.

[0011] Based on the further improvement of the above-mentioned double-tangent tool, the depth of cut b of the second ball end cutting edge satisfies:

[0012]

[0013] Among them, H Ⅱ H represents the material hardness of the second ball-end cutting edge. 钛合金 The hardness of the titanium alloy casting material; K b The value is a correction factor, ranging from 2.6 to 8.9; D is the diameter of the second ball end cutting edge, ranging from 6 to 12 mm.

[0014] Based on the further improvement of the above-mentioned dual-point cutting tool, the lower end of the first carrier body is provided with a first mounting groove for mounting the first ball-end cutting edge, and the lower end of the second carrier body is provided with a second mounting groove for mounting the second ball-end cutting edge; the working rake angle α of the first ball-end cutting edge satisfies:

[0015]

[0016] Among them, H Ⅰ H represents the material hardness of the first ball-end cutting edge. 钛合金 The hardness of the titanium alloy casting material; K α is a correction factor, with a value range of 16.9 to 25.9; a is the depth of cut of the first ball end cutting edge;

[0017] The working rake angle β of the second ball end cutting edge satisfies:

[0018]

[0019] Among them, H Ⅱ H represents the material hardness of the second ball-end cutting edge. 钛合金 The hardness of the titanium alloy casting material; K β is a correction factor, with a value range of 14.2 to 25.3; b is the depth of cut of the second ball end cutting edge;

[0020] Wherein, the sum of 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 is the working rake angle of the first ball-head cutting edge;

[0021] 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-end cutting edge is the working rake angle of the second ball-end cutting edge.

[0022] Based on the further improvement of the above-mentioned dual-cutting-point tool, a rectangular through slot is provided on the tool holder, and the first and second carriers are inserted into the rectangular through slot and are movably and fixedly connected to the tool holder.

[0023] Based on the above-mentioned improvements to the dual-point cutting tool, a depth-of-cut adjustment mechanism is also included for adjusting the depth of cut of the first ball-end cutting edge and the second ball-end cutting edge.

[0024] The depth-of-cut adjustment mechanism includes a depth-of-cut adjustment gear and a drive device for controlling the rotation of the depth-of-cut adjustment gear; the drive device drives the first and second carriers to move up and down within the rectangular through slot of the tool holder through the engagement of the depth-of-cut adjustment gear with the first carrier and the second carrier.

[0025] Based on the further improvement of the above-mentioned dual-cutting-point tool, the first and second carriers are respectively provided with rectangular grooves on their mutually contacting surfaces. The rectangular grooves of the first and second carriers together form an internal cavity for accommodating the depth-of-cut adjustment gear. The depth-of-cut adjustment gear is disposed in the internal cavity formed by the rectangular grooves of the first and second carriers.

[0026] The bottom surface of the rectangular groove is a toothed surface, and the first and second carriers are connected to the depth-of-cut adjustment gear through the toothed surface.

[0027] Further improvements to the aforementioned dual-cutting-point tool also include a cleaning device for cooling, lubricating, and removing residual metal debris from the gap between the adjacent end faces of the first and second ball-end cutting edges.

[0028] Based on the further improvement of the above-mentioned dual-cutting-point tool, the cleaning device includes a first channel and a second channel for gas and liquid flow opened on the first carrier. Along the cutting direction, the air jet of the first channel and the liquid spray of the second channel are respectively located at the rear end of the ball face of the first ball cutting edge and the second ball cutting edge, and are arranged toward the gap between the first ball cutting edge and the second ball cutting edge.

[0029] Based on the further improvement of the above-mentioned dual-cutting point tool, along the cutting direction, the air jet port of the first channel is located at the lower end of the liquid jet port of the second channel.

[0030] The gas is air or nitrogen, and the liquid is cutting fluid.

[0031] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0032] 1. The machining tool of the present invention is a double-point misaligned tool composed of two ball-end cutting edges, that is, the two ball-end cutting edges cut synchronously, and the distance difference between the lower edges of the two ball-end cutting edges is not equal to 0. Thus, the depth of cut of the machine tool running one machining trajectory is the sum of the depths of cut of the two ball-end cutting edges, which improves the efficiency of single cutting. In addition, by setting the working rake angle combination of the two ball-end cutting edges, that is, α < β, the overall sharpness of the machining tool is improved while ensuring the overall impact resistance of the machining tool, thereby improving the machining efficiency.

[0033] 2. The relative positions of the first and second carriers can be adjusted by adjusting the depth of cut gear, thereby precisely adjusting the depth of cut of the ball end cutting edge and adjusting the position of each cutting edge relative to the inner cavity of the titanium alloy casting chamber during the machining process. In this way, reciprocating cutting can be achieved on the one hand, and cutting can be performed on the inner cavity near the bottom of the titanium alloy casting chamber on the other hand, so as to achieve all-round machining of the inner cavity of the titanium alloy casting chamber without dead angles, thereby improving machining efficiency.

[0034] 3. The processing tools of the present invention have a long service life, thereby avoiding frequent tool replacement and improving processing efficiency. The processing time for a single titanium alloy casting chamber cavity can be as low as 4.5 hours, which is about twice as efficient as the prior art.

[0035] 4. When machining the inner cavity of a titanium alloy casting chamber, this invention uses two ball-end cutting edges to share the machining amount, reducing the machining amount borne by a single cutting edge. Compared with the prior art, when machining a single part, the wear on a single cutting edge is reduced, thus improving the tool life. Furthermore, one ball-end cutting edge bears the main impact with a larger working rake angle, protecting the other ball-end cutting edge. That is, in the initial state, the machining allowance of the ribs in the inner cavity of the titanium alloy casting chamber is uneven. One ball-end cutting edge contacts the ribs first. The ball-end cutting edge with a smaller working rake angle has better impact resistance and bears the main impact. The end face of this ball-end cutting edge after machining is a uniform end face, avoiding the phenomenon of local discontinuous cutting caused by the uneven end face, thereby reducing the impact on the other ball-end cutting edge and thus improving the service life of the machining tool.

[0036] 5. 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, solving 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 edges. At the same time, it can remove the debris adhering to the gap between the cutting edges and avoid debris friction on the cutting edges. This further improves the service life of the machining tool. The service life of a single cutting edge is at least 8.2 hours, which is 16.4-24.6 times higher than the existing technology.

[0037] 6. Both ball-head cutting edges of the present invention can be circular blades, and the working rake angles of the circular blades are the same at all angles. 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 perform cutting operations with the original cutting depth 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 cutting depth and working rake angle during the installation process, which improves the installation efficiency and thus improves the overall processing efficiency.

[0038] 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

[0039] 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.

[0040] Figure 1 This is a schematic diagram of the cooperation structure between the dual-cutting-point tool and the titanium alloy casting chamber in the axial feed direction of the present invention;

[0041] Figure 2 This is a schematic diagram of the cooperation structure between the dual-cutting-point tool and the titanium alloy casting chamber in the cutting forward direction of the present invention;

[0042] Figure 3 This is a schematic diagram of the mating structure between the first ball-end cutting edge and the first carrier body in the axial feed direction of the present invention;

[0043] Figure 4 This is a three-dimensional schematic diagram of the cooperation structure between the first ball-end cutting edge, the second ball-end cutting edge, and the tool holder in the cutting forward direction of the present invention;

[0044] Figure 5 This is a schematic diagram of the cooperation structure between the first ball-end cutting edge and the second ball-end cutting edge in the cutting forward direction in this invention;

[0045] Figure 6 This is a cross-sectional view of the first support body, the second support body, and the tool holder in this invention.

[0046] Figure 7 for Figure 6 Schematic diagram of the cross section at point AA;

[0047] Figure 8 for Figure 7 A schematic diagram of the mating structure of the first and second load-bearing bodies at the mid-section;

[0048] Figure 9 This is a schematic diagram of the tool holder structure in this invention;

[0049] Figure 10 This is a schematic diagram of the processing device in this invention.

[0050] Figure label:

[0051] 1-Tool holder; 101-Rectangular through slot; 102-Protrusion; 2-First support body; 3-Second support body; 4-First ball end cutting edge; 5-Second ball end cutting edge; 6-Depth of cut adjustment gear; 7-Rectangular groove; 8-Groove; 9-First channel; 10-Second channel; 11-Titanium alloy casting chamber; 12-Direction of rotation of titanium alloy casting chamber around axis; 13-Axis of titanium alloy casting chamber; 14-Axial feed direction of double-point tool; 15-Cutting forward direction; 16-Force direction of first ball end cutting edge; 17-Tool holder; 18-Base; 19-Upper ring; 20-Lower ring; 21-Screw; 22-Machining reference surface of first ball end cutting edge; 23-Second ball end The machining reference surface during cutting; α1 - fixed value of the rake angle of the first ball-end cutting edge; α2 - installation rake angle of the first ball-end cutting edge; C - distance between the lower edges of the first ball-end cutting edge and the second ball-end cutting edge; D - diameter of the second ball-end cutting edge; R - distance between adjacent side edges of the first ball-end cutting edge and the second ball-end cutting edge; a - depth of cut of the first ball-end cutting edge with its machining reference surface as the reference; b - depth of cut of the second ball-end cutting edge with its machining reference surface as the reference; w1 - diameter of the depth of cut adjustment gear; w2 - length of the upper end of the first carrier; w3 - groove depth of the rectangular groove; w4 - side wall length of the rectangular groove; w5 - width of the rectangular groove. Detailed Implementation

[0052] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0053] A large titanium alloy 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 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.

[0054] To address the above problems, this invention provides a dual-cutting-point tool for machining the internal cavity of a titanium alloy casting chamber, such as... Figure 4As 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 mounted on the lower end of the first support body 2 and a second ball-end cutting edge 5 mounted on the lower end of the second support body 3;

[0055] like Figure 1-2 As shown, along the cutting direction, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are arranged parallel to each other and cut synchronously; however, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are not parallel. That is to say, during the circumferential cutting along the inner cavity of the titanium alloy casting chamber 11, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 move in parallel, but the cutting depths of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 along the inner cavity of the titanium alloy casting chamber 11 are different.

[0056] Compared with the prior art, along the cutting direction, the machining tool of the present invention is a ball-end cutting edge with two cutting edges arranged flat. The ball-end surfaces of the ball-end cutting edges are located in the same plane, and there is a height difference between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5. That is, the distance difference between the lower edges of the two ball-end cutting edges is not equal to 0. The two cutting edges are cut synchronously to form a tool with double tangent points misaligned for double tangent point misalignment machining. During the cutting process, the tool cuts circumferentially along the inner cavity of the titanium alloy casting chamber 11 and feeds axially along the inner cavity of the titanium alloy casting chamber 11. After cutting one revolution circumferentially along the inner cavity of the titanium alloy casting chamber 11, a circumferential machining trajectory is formed. The second ball-end cutting edge 5 cuts on the previous machining trajectory formed by the first ball-end cutting edge 4. Thus, the depth of cut of one machining trajectory is the sum of the depths of cut of the two ball-end cutting edges, improving the efficiency of a single cutting operation. Simultaneously, by distributing the cutting amount among the two ball-end cutting edges, the machining amount borne by a single cutting edge is reduced. When machining a single part, the wear on a single cutting edge is reduced, thus increasing the tool life. The long tool life avoids frequent tool replacements, thereby improving machining efficiency. The machining time for a single titanium alloy casting chamber inner cavity can be as low as 4.5 hours, which is approximately double the machining efficiency compared to existing technologies.

[0057] In this machining process, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are not flush, meaning there is a height difference between their lower edges. Both cutting edges operate synchronously, creating a double-point misaligned tool for machining. For example, the depth of cut of the first ball-end cutting edge 4 is 'a', the depth of cut of the second ball-end cutting edge 5 is 'b', and the distance between the lower edges of the second ball-end cutting edge 5 and the first ball-end cutting edge 4 is C = b > 0. The depth of cut Y = a + b is the depth of cut for one machining trajectory.

[0058] Specifically, such as Figure 4As shown, the above-mentioned double-cutting-point tool includes a tool holder 1 and 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 end cutting edge, the lower end of the first carrier 2 is provided with a first mounting groove for installing the first ball end cutting edge 4, and the lower end of the second carrier 3 is provided with a second mounting groove for installing the second ball end cutting edge 5.

[0059] Specifically, one side of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are respectively screwed into the first mounting groove and the second mounting groove. Along the cutting direction, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 have two opposing surfaces. One surface is the mounting surface for mounting the first carrier 2 and the second carrier 3, and the other end face is a convex ball-end surface serving as the working side. The edge of the convex surface is a circular cutting edge, and the diameter of both circular cutting edges is D. The gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is R = 1 / 4D. This smaller gap helps to prevent larger chips from entering the adjacent area of ​​the two ball-end cutting edges, thereby reducing wear on the first ball-end cutting edge 4 and the second ball-end cutting edge 5. At the same time, it facilitates machining of the area near the bottom of the inner cavity of the titanium alloy casting chamber 11, thereby improving machining efficiency. For example, D is 12mm.

[0060] The depth of cut of the ball end cutting edge is determined based on the material hardness of the ball end cutting edge and the hardness of the material to be machined, in order to improve the service life and machining efficiency of the two ball end cutting edges.

[0061] Specifically, the depth of cut 'a' of the first ball-end cutting edge 4 satisfies:

[0062]

[0063] Among them, H Ⅰ The material hardness of the first ball-end cutting edge 4;

[0064] H 钛合金 The hardness of titanium alloy casting material 11;

[0065] K a This is a correction factor, with a value ranging from 3.0 to 8.9;

[0066] D is the diameter of the first ball-end cutting edge 4, and its value ranges from 6 to 12 mm.

[0067] Specifically, the depth of cut b of the second ball-end cutting edge 5 satisfies:

[0068]

[0069] Among them, H Ⅱ The material hardness of the second ball-end cutting edge 5;

[0070] H 钛合金The hardness of titanium alloy casting material 11;

[0071] K b This is a correction factor, with a value ranging from 2.6 to 8.9;

[0072] D is the diameter of the second ball-end cutting edge 5, and its value ranges from 6 to 12 mm.

[0073] For example, the diameter D is 12mm, H 钛合金 For RHC30, the first ball-end cutting edge 4 is made of cemented carbide, H Ⅰ For RHC70, K a The value is 7.10, at which point a = 1 mm.

[0074] For example, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 have the same shape, size, and material. In this case, H Ⅰ =H Ⅱ =RHC70; where K b The value is 6.47, at which point b = 1.1 mm.

[0075] Considering that when machining the inner cavity near the bottom of the titanium alloy casting chamber 11, the aforementioned double-cutting-point tool cannot achieve the final machining of the inner cavity near the bottom of the titanium alloy casting chamber 11, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 of the present invention can move up and down under the drive of the first carrier 2 and the second carrier 3.

[0076] Specifically, the tool holder 1 has a rectangular through slot 101. The inner wall of the rectangular through slot 101 has multiple protrusions 102 that penetrate the upper and lower end faces of the tool holder 1. The outer surfaces of the first support body 2 and the second support body 3 have multiple grooves 8 that penetrate the upper and lower end faces of the two support bodies. One side of the first support body 2 and the second support body 3 are inserted into the rectangular through slot 101 in a close fit. The multiple grooves 8 on the outer surface of the first support body 2 are fitted into the multiple protrusions 102 on the inner wall of the rectangular through slot 101 in a one-to-one correspondence. The multiple grooves 8 on the outer surface of the second support body 3 are fitted into the multiple protrusions 102 on the inner wall of the rectangular through slot 101 in a one-to-one correspondence. Under the action of external force, the first support body 2 and the second support body 3 can move up and down in the rectangular through slot 101 of the tool holder 1.

[0077] Furthermore, an adjustment mechanism can be provided in the tool holder 1 to facilitate the application of external force to enable the first support body 2 and the second support body 3 to move up and down within the rectangular through groove 101 of the tool holder 1.

[0078] Specifically, the adjustment mechanism includes a depth-of-cut adjustment gear 6. In order to form an internal cavity to accommodate the depth-of-cut adjustment gear 6, rectangular grooves 7 are respectively provided on the surfaces of the first support body 2 and the second support body 3 that are in contact with each other. The rectangular grooves 7 of the first support body 2 and the rectangular grooves 7 of the second support body 3 together form an internal cavity to accommodate the depth-of-cut adjustment gear 6.

[0079] In order to enable the first carrier 2 and the second carrier 3 to move up and down in the rectangular through groove 101 of the tool holder 1, the bottom surface of the rectangular groove 7 is a toothed surface, which can mesh with the depth of cut adjustment gear 6.

[0080] To facilitate the application of external force, the adjustment mechanism also includes a rotating shaft. One end of the rotating shaft is connected to the depth-of-cut adjustment gear 6, and the other end is connected to the drive assembly mounted on the tool holder 1. There can be two rotating shafts, one at each end of the depth-of-cut adjustment gear 6.

[0081] The aforementioned drive assembly includes a drive shaft meshing with a rotating shaft at one end and a drive motor assembly for controlling the rotation of the drive shaft. The two planar ends of the depth-of-cut adjustment gear 6 are slidably connected to the side end faces of the rectangular groove 7.

[0082] When the depth of cut needs to be adjusted, the drive assembly is activated, and the depth of cut adjustment gear 6 rotates under the action of the drive assembly. In the initial state, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are flush. If the depth of cut adjustment gear 6 rotates clockwise, the first carrier 2 drives the first ball-end cutting edge 4 away from the inner wall of the titanium alloy casting chamber 11, and the second carrier 3 drives the second ball-end cutting edge 5 closer to the inner wall of the titanium alloy casting chamber 11, thereby realizing the adjustment of the distance difference C between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0083] Among them, when the depth of cut adjustment gear 6 rotates clockwise, the distance P1 that the first ball-end cutting edge 4 moves away from the end face of the inner cavity of the titanium alloy casting chamber 11 satisfies:

[0084] P1 = v1 * t1

[0085] Wherein, v1 is the linear velocity of the side end face when the depth of cut adjustment gear 6 rotates;

[0086] t1 is the rotation time of the depth-of-cut adjustment gear 6.

[0087] The distance P2 that the second ball-end cutting edge 5 moves close to the inner end face of the titanium alloy casting chamber 11 satisfies:

[0088] P2 = P1

[0089] therefore,

[0090] At this point, the rotation time of the depth-of-cut adjustment gear 6 is:

[0091]

[0092] In this way, the positions of the first support 2 and the second support 3 can be precisely adjusted.

[0093] Specifically, the cuboid sections at the upper ends of the first support body 2 and the second support body 3 have the same structural dimensions, and the depth-of-cut adjustment gear 6 is a cylindrical structure with a diameter w1 = w2, where w2 is the length dimension of the upper end of the first support body 2 or the second support body 3.

[0094] The dimensional conditions of the rectangular groove satisfy the following:

[0095] The depth of rectangular groove 7 is w3 = 1 / 2w2;

[0096] The sidewall length of rectangular groove 7 is w4 = 1 / 4w2;

[0097] The width of rectangular groove 7 is w5 = 2πw2.

[0098] Generally, the larger the working rake angle of a cutting edge, the sharper the edge, but the weaker its impact resistance. Current technologies typically improve machining efficiency by increasing the sharpness of the cutting edge, but this often results in a short cutting edge life, requiring frequent manual tool replacements. Furthermore, considering the uneven machining allowance of the ribs within the titanium alloy casting cavity, when two parallel ball-end cutting edges are used, both edges must bear the primary impact, leading to a simultaneous decrease in the lifespan of both machining tools.

[0099] Therefore, the present invention uses the working rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 that cooperate with each other, that is, the working rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are different. One ball-end cutting edge contacts the rib first. The ball-end cutting edge with a smaller working rake angle has better impact resistance and can withstand the main impact, thereby further improving the tool's service life, overall strength and cutting efficiency.

[0100] Specifically, such as Figure 2-4 As shown, the fixed rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are α1 and β1, respectively, and the installation rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are α2 and β2, respectively. The working rake angle of the first ball-end cutting edge 4 is α = α1 + α2, and the working rake angle of the second ball-end cutting edge 5 is β = β1 + β2.

[0101] The working rake angle α of the first ball end cutting edge 4 is set to be relatively small in order to bear the main impact and protect the second ball end cutting edge 5. The value of α is determined by the hardness of the titanium alloy casting 11 material and the cutting depth of the first ball end cutting edge 4. The working rake angle β of the second ball end cutting edge 5 is greater than α, that is, α < β, in order to improve its sharpness and thus improve the overall processing efficiency.

[0102] After determining the values ​​of α and β, the values ​​of α and β are adjusted by adjusting the inclination of the bottom surfaces of the first and second mounting grooves and the fixed values ​​of the rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0103] Specifically, the working rake angle α of the first ball end cutting edge 4 satisfies:

[0104]

[0105] Among them, H Ⅰ The material hardness of the first ball-end cutting edge 4;

[0106] H 钛合金 The hardness of titanium alloy casting material 11;

[0107] K α This is a correction factor, with a value ranging from 16.9 to 25.9;

[0108] a represents the depth of cut of the first ball-end cutting edge 4.

[0109] Specifically, the working rake angle β of the second ball end cutting edge 5 satisfies:

[0110]

[0111] Among them, H Ⅱ The material hardness of the second ball-end cutting edge 5;

[0112] H 钛合金 The hardness of titanium alloy casting material 11;

[0113] K β This is a correction factor, with a value range of 14.2 to 25.3;

[0114] b is the depth of cut of the second ball-end cutting edge 5.

[0115] For example, K α H is 20.33. Ⅰ For RHC70, H 钛合金 For RHC30, a is 1 mm, and α = -1.5°.

[0116] For example, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 have the same shape, size, and material. In this case, H Ⅰ =H Ⅱ =RHC70; where K β Since the value is 18.08 and b = 1.1 mm, β = 0.5°.

[0117] Specifically, the fixed rake angle values ​​of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are determined by the shape of the ball-end cutting edge itself. For example, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 have the same shape. In this case, the fixed rake angle values ​​α1 and β1 of the two ball-end cutting edges satisfy: α1 = β1, specifically 1.5°. Therefore, according to the formulas α = α1 + α2 and β = β1 + β2, the installation rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 can be calculated. That is, the installation rake angle α2 of the first ball-end cutting edge 4 is α - α1 = -1.5° - 1.5° = -3°, and the installation rake angle β2 of the second ball-end cutting edge 5 is β - β1 = 0.5° - 1.5° = -1°.

[0118] After determining the mounting rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5, the inclination of the bottom surface in the first mounting groove and the second mounting groove is set respectively. The bottom surface is the surface that contacts the mounting surface of the first ball-end cutting edge 4 or the second ball-end cutting edge 5. The inclination of the bottom surface is the same as the mounting rake angle of the first ball-end cutting edge 4 and the second ball-end cutting edge 5, thereby realizing the adjustment of the mounting rake angles of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0119] Specifically, such as Figure 6 As shown, the first carrier 2 consists of upper and lower parts. The upper part is installed in a rectangular through slot 101 within the tool holder 1, and the lower part is screwed to the lower end of the upper part for easy replacement. The lower part of the first carrier 2 has a first mounting slot for installing the first ball-end cutting edge 4, as shown... Figure 3 As shown, the bottom surface of the first mounting groove has an inclination of α2. When machining the lower part of the first carrier 2, the inclination of the bottom surface is shaped to adjust the working rake angle of the first ball head cutting edge 4.

[0120] Specifically, the second support body 3 has the same structure as the first support body 2, the difference being the inclination of the bottom surface of the second mounting groove opened at the lower part of the second support body 3, the inclination of the bottom surface of the second mounting groove is β2.

[0121] Considering the small gap between the adjacent surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5, for example, the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is 3mm; during the cutting process, the existing cutting fluid supply method may not be able to reach the gap, and the end face at the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5 cannot be cooled. In addition, chips may also enter the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5, and may accumulate between the first ball-end cutting edge 4 and the second ball-end cutting edge 5. Excessive chip accumulation will wear down the first ball-end cutting edge 4 and the second ball-end cutting edge 5, reducing their service life.

[0122] To solve the above problems, a cleaning device can be provided to cool, lubricate, and remove residual metal chips at the gap between the adjacent surfaces of the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5 during cutting.

[0123] Specifically, the cleaning device includes a first channel 9 and a second channel 10 formed on the first carrier 2 for the flow of gas and liquid. Along the cutting forward direction, the gas jet outlet of the first channel 9 and the liquid jet outlet of the second channel 10 are respectively located at the rear end of the ball-nose 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 first ball-nose cutting edge 4 and the second ball-nose cutting edge 5.

[0124] In order to increase the flow rate of the cutting fluid ejected from the second channel 10 to clean the debris adhered to the gap between the adjacent edges of the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5, the present invention uses the ejected gas to increase the flow rate of the cutting fluid, thereby improving the cleaning efficiency of the debris. At the same time, by accelerating the air flow on the surfaces of the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5, the cooling effect on the double-tangent tool is improved.

[0125] Specifically, along the cutting forward direction, the gas jet outlet of the first channel 9 is arranged at the lower end of the liquid jet outlet of the second channel 10. Among them, air or nitrogen is used for flow in the first channel 9, and cutting fluid is used for flow in the second channel 10. The diameter of the gas jet outlet of the first channel 9 is x1, and the diameter of the liquid jet outlet of the second channel 10 is x2, where 1 / 3*R1 < x1 = x2 < 1 / 2*R1, that is, 1mm < x1 = x2 < 1.5mm. It is set that x1 = x2 = 1.4mm; among them, the air outlet rate of the gas jet outlet of the first channel 9 is 8 - 10m / s; the liquid outlet rate of the liquid jet outlet of the second channel 10 is 0.25 - 0.3m / s. In this way, the ejected gas increases the cutting fluid towards the gap between the adjacent surfaces of the first ball-nose cutting edge 4 and the second ball-nose cutting edge 5, so as to improve the effects of cooling, lubricating, and removing residual metal chips on the cutting edges in the gap.

[0126] In order to enable the first channel 9 to stably eject gas and the second channel 10 to stably eject cutting fluid, a gas supply device and a liquid supply device are provided outside the first carrier 2. Specifically, the air inlet end of the first channel 9 is connected to the gas supply device arranged outside the first carrier 2, and the gas supply device includes a gas transmission pipe for conveying air or nitrogen into the first channel 9. The liquid inlet of the second channel 10 is connected to the liquid supply device, and the liquid supply device includes a liquid transmission pipe for conveying cutting fluid into the second channel 10.

[0127] To better utilize the aforementioned dual-point cutting tool for cutting operations, the present invention also provides a machining apparatus for the inner cavity of a titanium alloy casting chamber. This apparatus includes the aforementioned dual-point cutting tool and a drive device for controlling the movement of the dual-point cutting tool. The drive device includes a tool holder 17 fixedly connected to the tool holder 1 and a machine tool assembly for driving the tool holder 17 to move, thereby enabling the dual-point cutting tool to move axially within the inner cavity of the titanium alloy casting chamber and adjusting the distance between the dual-point cutting tool and the inner cavity of the titanium alloy casting chamber 11.

[0128] Specifically, such as Figure 10 As shown, the machining device includes the aforementioned double-cutting-point tool and a tool bar 17 with one end fixedly connected to the tool holder 1. The other end of the tool bar 17 is fixedly disposed in the base 18, which is mounted on the machine tool Z-axis support plate. Thus, the machine tool Z-axis support plate controls the base 18 to drive the tool bar 17 to move, thereby driving the double-cutting-point tool to move in the direction of the Z-axis support plate to perform cutting operations.

[0129] Specifically, the parameters of tool holder 17 satisfy:

[0130] Diameter E = 0.35 * E1;

[0131] Length L = L1 + 5;

[0132] Strength coefficient

[0133] Wherein, E1 is the inner diameter of the titanium alloy casting chamber 11;

[0134] L1 is the depth of the inner cavity of the titanium alloy casting chamber 11.

[0135] For example, E1 = 760mm, L1 = 920mm, at this time, It can be seen that t≤5, which belongs to a high-strength system, and the strength of tool holder 17 can meet the cutting requirements.

[0136] To improve the stability of the cutting process, a clamping fixture is also provided. The clamping fixture includes two clamping parts for fixing the titanium alloy casting chamber 11, which are used to clamp the titanium alloy casting chamber 11 axially to ensure the stability of the titanium alloy casting chamber 11 during cutting, thereby improving the cutting efficiency.

[0137] Specifically, the clamping fixture includes an upper ring 19 and a lower ring 20 fixedly connected to the upper ring 19 via a screw 21. The upper ring 19 is fixed to the end face of the machine tool chuck and is used to hold the titanium alloy casting chamber 11. The lower ring 20 is fixedly connected to the upper ring 19 via the screw 21 and clamps the titanium alloy casting chamber 11 between the upper ring 19 and the lower ring 20, axially pressing the titanium alloy casting chamber 11. Thus, this clamping fixture concentrates the clamping force in the axial direction, reducing the radial force on the titanium alloy casting chamber 11, greatly reducing clamping deformation of the titanium alloy casting chamber 11, and improving stable cutting control of the titanium alloy casting chamber 11.

[0138] To further improve the stability of clamping the titanium alloy casting 11, the upper ring 19 and the lower ring 20 are provided with a stop with a clearance of 0.1mm from the outer shape of the titanium alloy casting 11, so as to restrict the five degrees of freedom of the titanium alloy casting 11 in the X, Y, Z, A and B directions.

[0139] Specifically, to facilitate the clamping of the titanium alloy casting housing, the parameters of the upper ring 19 meet the following requirements:

[0140] Inner diameter j1=0.9E1;

[0141] Outer diameter j2 = 1.2E1.

[0142] The parameters of the lower ring 20 satisfy:

[0143] Inner diameter j3=0.97E1;

[0144] Outer diameter j4 = 1.2E1.

[0145] The parameters of screw 21 satisfy:

[0146] Length g = 1.1L1.

[0147] Specifically, four screws 21 are provided, evenly distributed between the upper ring 19 and the lower ring 20. Each end of the screw 21 has a matching nut, which secures the upper ring 19 and the lower ring 20 by engaging the screws 21 with the nuts. For example, the nut is a GBT6170 nut M20, and a torque wrench is used to tighten it.

[0148] The torque value M of the torque wrench is set to 45±3 N·m. During the tightening of the nut using the torque wrench, the torque wrench emits a "click" sound to indicate that the set torque value has been reached. The tightening torque f1 of the nut satisfies:

[0149]

[0150] Among them, T 扭矩 =M = 45 ± 3 N·m;

[0151] K 扭矩The torque coefficient corresponding to this nut is 0.15;

[0152] d 螺杆 The diameter of the end where the screw 21 mates with the nut is 0.020 μm.

[0153] at this time, The total clamping force f of the four nuts on the lower ring 20 总 =4f1=60~64KN.

[0154] For example, a resistance force gauge is used to measure the turning force f. 车削 Measurements were taken during the turning process, f 车削 The resistance is consistently less than 55 kN, which is visually demonstrated by the fact that the titanium alloy casting chamber 11 remains in a stable clamping state during the machining process.

[0155] For example, the external dimensions of the titanium alloy casting chamber 11 are measured by laser scanner or dial indicator. Before clamping, the inner diameter depth of the titanium alloy casting chamber 11 is L1 = 1m; after clamping, the inner diameter depth of the titanium alloy casting chamber 11 is L2 = 1.02m; L2-L1 = 0.02 < 0.05. It can be seen that the mechanical properties of the clamping fixture meet the requirements during the turning process. At the same time, the clamping results in a small deformation of the titanium alloy casting chamber 11, which meets the processing requirements.

[0156] To further improve the service life of dual-point cutting tools, a cutting fluid feeding device is also provided. This cutting fluid feeding device includes a cutting fluid delivery pipe for conveying cutting fluid along the cutting direction to cool, lubricate, and remove larger chips from the ball face of the first ball cutting edge 4 and the second ball cutting edge 5.

[0157] Specifically, along the cutting direction, the outlet of the cutting fluid delivery pipe is positioned at the gap between the cutting surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5. The outlet diameter of the cutting fluid delivery pipe is X3 = 5 / 4D, and the cutting fluid flow velocity at the outlet is 0.2-0.3 m / s. During cutting, the cutting fluid contacts the ball-end surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5, then flows downwards through the side ends of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 to the side end faces; additionally, a small portion of the cutting fluid flows into the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0158] To achieve stable cutting fluid ejection from the cutting fluid delivery pipe, the cutting fluid feeding device includes a cutting fluid storage device for delivering cutting fluid into the cutting fluid delivery pipe, so as to stably deliver cutting fluid into the cutting fluid delivery pipe.

[0159] During operation, the machine tool's Z-axis support plate controls the base 18 to move the tool holder 17, which in turn moves the double-point cutting tool in the direction of the Z-axis support plate. The titanium alloy casting chamber 11 is clamped using a clamping fixture, and the machine tool chuck rotates the clamping fixture, which in turn rotates the titanium alloy casting chamber 11 for cutting operations. During cutting, the feed rate of the tool holder 17 is 0.1-0.2 mm / r, and the rotational speed of the titanium alloy casting chamber 11 is v2 = 29-37 r / min.

[0160] In addition, this invention also provides a method for machining the inner cavity of a titanium alloy casting chamber, including simultaneously cutting the inner cavity of the titanium alloy casting chamber 11 using a first ball-end cutting edge 4 and a second ball-end cutting edge 5; during cutting, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are not flush, but are flush along the cutting direction. This solves the problem of frequent impacts between the part and the tool, leading to rapid tool breakage or wear, and also improves machining efficiency. Specifically, it includes the following steps.

[0161] Step 1: Use clamping fixtures to clamp the titanium alloy casting chamber 11 in the axial direction.

[0162] Specifically, the upper ring 19 is fixed to the end face of the machine tool chuck, and one end of the titanium alloy casting cup 11 is placed inside the stop of the upper ring 19; then the stop of the lower ring 20 is clamped on the other end face of the titanium alloy casting cup 11, and the lower ring 20 is fixedly connected to the upper ring 19 by the cooperation of the screw 21 and the nut, so as to restrict the five degrees of freedom of the titanium alloy casting cup 11 in the X, Y, Z, A and B directions, improve the stability of the titanium alloy casting cup 11, and at the same time, realize the clamping force to be concentrated in the axial direction, reduce the radial force of the titanium alloy casting cup 11, and can greatly reduce the clamping deformation of the titanium alloy casting cup 11.

[0163] Step 2: Connect the dual-point cutting tool to the device used to control axial feed or axial discharge.

[0164] Specifically, the tool holder 1 of the double-cutting-point tool is fixedly connected to the tool shank 17, and the other end of the tool shank 17 is fixedly set in the base 18. The base 18 is mounted on the Z-axis support plate of the machine tool. Thus, the base 18 is controlled by the Z-axis support plate of the machine tool to drive the tool shank 17 to move, thereby driving the double-cutting-point tool to move in the direction of the Z-axis support plate to perform cutting operations.

[0165] Step 3: Set the tool feed position and adjust the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 to be uneven along the cutting direction.

[0166] Specifically, using the horizontal line parallel to the machine tool as the X-axis, the vertical line perpendicular to the X-axis as the Y-axis, the center of one port of the titanium alloy casting chamber 11 as the zero point, and the surface parallel to the inner cavity port of the top of the titanium alloy casting chamber 11 as the coordinate axis, the tool feed position is at a position 45° to the lower left of the inner cavity port of the titanium alloy casting chamber 11, i.e., -135°. This facilitates the cleaning of chips at the first ball-end cutting edge 4 and the second ball-end cutting edge 5, and also facilitates the supply of cutting fluid from the ball-end surfaces of the two ball-end cutting edges by the cutting fluid supply device. The residence time of the cutting fluid on the surface of the two ball-end cutting edges is increased, thereby improving the utilization efficiency of the cutting fluid.

[0167] Specifically, the first support body 2 and the second support body 3 are adjusted to be perpendicular to the end face of the feed position via the machine tool; the depth of cut adjustment gear 6 is rotated clockwise for a certain period of time. The distance between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is b.

[0168] Step 4: Adjust the state of the titanium alloy casting chamber 11 and move the double-cutting point tool to the tool feeding position.

[0169] Specifically, the machine tool controls the chuck to rotate counterclockwise, thereby causing the inner cavity of the titanium alloy casting chamber 11 to rotate counterclockwise; and the Z-axis support plate controls the movement of the tool holder 17, thereby moving the double-cutting point tool to the tool feeding position.

[0170] Step 5: Use the dual-cutting-point tool to cut and machine the inner cavity of the titanium alloy casting chamber 11.

[0171] Specifically, the inner cavity of the titanium alloy casting chamber 11 is cut simultaneously using the first ball-end cutting edge 4 and the second ball-end cutting edge 5. During cutting, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are not flush, but are flush along the cutting direction. During cutting, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 advance or exit axially along the inner cavity of the titanium alloy casting chamber 11.

[0172] During the initial machining of the inner cavity of the titanium alloy casting chamber 11, the first ball-end cutting edge 4 first cuts the inner cavity of the titanium alloy casting chamber 11. At this time, the second ball-end cutting edge 5 is in an idle state. During machining, the titanium alloy casting chamber 11 rotates at a speed of v2 = 29~37 r / min for a period of time. Then, the tool is axially advanced. At this time, the double-point tool feeds axially at a speed of 0.1-0.2 mm / r. During this process, the second ball-end cutting edge 5 cuts the surface processed by the first ball-end cutting edge 4. At this time, the machine tool runs a machining trajectory with a cutting depth Y = a + b, which greatly improves the machining efficiency.

[0173] In the initial state, the irregular ribs in the inner cavity of the titanium alloy casting chamber 11 have irregular machining allowances. The first ball-end cutting edge 4 bears the impact of the irregular allowance ribs with a small working rake angle to protect the second ball-end cutting edge 5. The second ball-end cutting edge 5 has a larger working rake angle to improve the sharpness during cutting, thereby improving the overall machining efficiency and service life of the double-cutting point tool.

[0174] Specifically, when the first ball-end cutting edge 4 moves axially to the inner cavity at the bottom of the titanium alloy casting chamber 11, the depth of cut adjustment mechanism adjusts the distance between the first ball-end cutting edge 4, the second ball-end cutting edge 5, and the inner cavity at the bottom of the titanium alloy casting chamber 11 to process the inner cavity. Specifically, the depth of cut adjustment gear 6 is rotated counterclockwise for a time t3 = t1. At this time, the first ball-end cutting edge 4 continues cutting with a depth of cut of v1 * t3. After a period of time t4 = t2, the depth of cut adjustment gear 6 is rotated counterclockwise again for a time... At this time, the first ball-end cutting edge 4 continues to cut, with a cutting depth of v1*t5; thus, the first ball-end cutting edge 4 is used to cut the inner cavity at the bottom of the titanium alloy casting 11. Finally, the surface finally machined by the first ball-end cutting edge 4 is flush with the surface finally machined by the second ball-end cutting edge 5.

[0175] Specifically, after the final machined surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are flush, the distance between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is adjusted to 'a' using the depth-of-cut adjustment gear. At this point, the first ball-end cutting edge 4 is closer to the inner wall of the titanium alloy casting chamber 11 than the second ball-end cutting edge 5. Next, the positions of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are further adjusted by the machine tool until the depth of cut of the second ball-end cutting edge 5 reaches 'b'. During this process, the first ball-end cutting edge 4 continuously cuts the bottom of the inner cavity of the titanium alloy casting chamber 11, with a depth of cut of a+b. During the adjustment of the depth of cut value 'b' of the second ball-end cutting edge 5, the feed rate of the double-point cutting tool is 0.1–0.2 mm / r. When the depth of cut of the second ball-end cutting edge 5 reaches 'b', the double-point cutting tool is axially moved away from the upper ring 19 by the Z-axis support plate, thus performing reciprocating cutting.

[0176] Step 6: During cutting, along the direction of cutting, cool, lubricate and remove chips from the gap between the ball face and adjacent face of the first ball cutting edge 4 and the second ball cutting edge 5.

[0177] Specifically, during cutting, the cutting fluid supply device is used to cool, lubricate, and remove larger chips from the ball-end surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5; at the same time, the air supply device and the liquid supply device are activated to cool, lubricate, and remove fine chips from the gap between the adjacent surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0178] During cutting, the nozzle of the cutting fluid delivery pipe always sprays cutting fluid towards the ball-end faces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5. As the cutting fluid flows downward, it coats the first ball-end cutting edge 4 and the second ball-end cutting edge 5. Since the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is small, for example, 3mm, a small amount of cutting fluid flows into the gap at a low speed. In addition, some cutting fluid flows to the tangent point of the first ball-end cutting edge 4 and the second ball-end cutting edge 5, limiting the chip agglomeration and cooling the inner cavity of the titanium alloy casting chamber 11 at the tangent point. This achieves cooling, lubrication and chip removal of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0179] During cutting, the air supply and fluid supply devices are activated to cool, lubricate, and remove debris from the gap between the adjacent surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5. This compensates for the poor treatment effect of the cutting fluid sprayed by the fluid supply device on the gap surface between the two ball-end cutting edges. Specifically, the second channel 10 located on the first carrier 2 sprays cutting fluid towards the gap, which can wash away the debris adhering to the gap and fully cool and lubricate the gap. At the same time, the first channel 9 sprays air into the gap, which increases the flow rate of the cutting fluid sprayed by the second channel 10 and also provides airflow impact to the debris adhering to the gap. In this way, the cooling, lubrication, and debris removal effects on the dual-cutting-point tool are further improved.

[0180] Compared with the prior art, the machining tool of the present invention is a double-point misaligned tool composed of two ball-end cutting edges, that is, both ball-end cutting edges participate in cutting, and the distance difference between the cutting ends of the two ball-end cutting edges is not equal to 0. In this way, the depth of cut of the machine tool running one machining trajectory is the sum of the depths of cut of the two ball-end cutting edges, which improves the efficiency of single cutting. In addition, by setting the working rake angle combination of the two ball-end cutting edges, that is, α < β, the overall sharpness of the machining tool is improved while ensuring the overall impact resistance of the machining tool, thereby improving the machining efficiency.

[0181] The relative positions of the first support body 2 and the second support body 3 can be adjusted by adjusting the depth of cut gear 6, thereby precisely adjusting the depth of cut of the ball end cutting edge and adjusting the position of each cutting edge relative to the inner cavity of the titanium alloy casting chamber 11 during the machining process. In this way, reciprocating cutting can be achieved on the one hand, and the side wall of the inner cavity of the titanium alloy casting chamber 11 near the upper ring 19 can be cut on the other hand, so as to achieve all-round machining of the inner cavity of the titanium alloy casting chamber 11 without dead angles, thereby improving the machining efficiency.

[0182] The machining tools of this invention have a long service life, thus avoiding frequent tool replacements and improving machining efficiency. The machining time for a single titanium alloy casting chamber 11 inner cavity can be as low as 4.5 hours, which is about twice as efficient as the prior art.

[0183] When machining the inner cavity of the titanium alloy casting chamber 11, this invention uses two ball-end cutting edges to share the machining amount, reducing the machining amount borne by a single cutting edge. Compared with the prior art, when machining a single part, the wear borne by a single cutting edge is reduced, thus improving the life of the machining tool. In addition, one ball-end cutting edge bears the main impact with a smaller working rake angle, protecting the other ball-end cutting edge. That is, in the initial state, the machining allowance of the ribs in the inner cavity of the titanium alloy casting chamber 11 is uneven. One ball-end cutting edge contacts the ribs first. The ball-end cutting edge with a smaller working rake angle has better impact resistance and bears the main impact. The end face of the ball-end cutting edge after machining is a uniform end face, avoiding the phenomenon of local discontinuous cutting caused by the uneven end face, thereby reducing the impact on the other ball-end cutting edge and thus improving the service life of the machining tool.

[0184] The cutting fluid ejection channel and gas ejection channel set on the first carrier 2 can be used to cool and lubricate the gap between the cutting edges, 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 tool. The service life of a single cutting edge is as low as 8.2 hours, which is 16.4-24.6 times higher than the existing technology.

[0185] Both ball-end 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.

[0186] Example 1:

[0187] A double-cutting-point tool for machining the inner cavity of a titanium alloy casting includes a tool holder 1, and a first support body 2 and a second support body 3 mounted on the tool holder 1. A first mounting groove and a second mounting groove are respectively provided at the lower ends of the first support body 2 and the second support body 3 for mounting a first ball-end cutting edge 4 and a second ball-end cutting edge 5. Along the cutting direction, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are flush and cut synchronously. The lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are not flush.

[0188] The first ball-end cutting edge 4 and the second ball-end cutting edge 5 are respectively screwed into the first mounting groove and the second mounting groove. Along the cutting direction, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 have two opposing surfaces. One surface is the mounting surface for mounting the first carrier 2 and the second carrier 3, and the other end surface is the ball-end convex surface that serves as the working side. The edge of the convex surface is a circular cutting edge. The diameter of both circular cutting edges is D, where D = 12 mm.

[0189] Among them, one end face of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is a mounting surface, which is screwed into the first mounting groove and the second mounting groove respectively. The other end face is a convex surface, and the end of the convex surface is a circular cutting edge. A groove is provided in the middle of the convex surface. During installation, the head of the screw is located in the groove, and the shank of the screw is fixedly connected to the first mounting groove or the second mounting groove through the mounting surface.

[0190] Among them, the depth of cut of the first ball-end cutting edge 4 Its working front angle Its installation front angle α2 = α - α1 = -1.5° - 1.5° = -3°;

[0191] Among them, the depth of cut of the second ball-end cutting edge 5 Its working front angle Its installation front angle β2 = β - β1 = 0.5° - 1.5° = -1°.

[0192] During axial feed, the distance C between the lower edges of the second ball-end cutting edge 5 and the first ball-end cutting edge 4 is 1.1 mm; during axial discharge, the distance C between the lower edges of the second ball-end cutting edge 5 and the first ball-end cutting edge 4 is 1 mm; the gap between adjacent edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is 3 mm. The depth of cut Y = a + b = 2.1 mm for one machining path.

[0193] Specifically, the first support body 2 consists of upper and lower parts. The upper part is installed in the rectangular through groove 101 inside the tool holder 1, and the lower part is screwed to the lower end of the upper part for easy replacement. The lower part of the first support body 2 has a first mounting groove for installing the first ball-end cutting edge 4. The second support body 3 has the same structure as the first support body 2, except that the bottom surface of the second mounting groove in the lower part of the second support body 3 has an inclination. The inclination of the bottom surface in the first mounting groove and the second mounting groove is the same as the angle of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 before installation.

[0194] The tool holder 1 has a rectangular through slot 101. The inner wall of the rectangular through slot 101 has multiple protrusions 102 penetrating the upper and lower end faces of the tool holder 1. The outer surfaces of the first support body 2 and the second support body 3 have multiple grooves 8 penetrating the upper and lower end faces of the two support bodies. One side of the first support body 2 and the second support body 3 are inserted into the rectangular through slot 101, and the multiple grooves 8 on the outer surface of the first support body 2 correspond one-to-one with the multiple protrusions 102 on the inner wall of the rectangular through slot 101. The multiple grooves 8 on the outer surface of the second support body 3 correspond one-to-one with the multiple protrusions 102 on the inner wall of the rectangular through slot 101. Multiple protrusions 102 on the wall are fitted one-to-one; an adjustment mechanism is provided inside the tool holder 1, which includes a depth-of-cut adjustment gear 6. Rectangular grooves 7 are respectively provided on the surfaces of the first support body 2 and the second support body 3 that are in contact with each other. The rectangular grooves 7 of the first support body 2 and the second support body 3 together form an internal cavity to accommodate the depth-of-cut adjustment gear 6. The bottom surface of the rectangular groove 7 is a toothed surface that can mesh with the depth-of-cut adjustment gear 6. The adjustment mechanism also includes a rotating shaft, one end of which is connected to the depth-of-cut adjustment gear 6, and the other end is connected to a drive assembly mounted on the tool holder 1. There can be two rotating shafts, respectively located at both ends of the depth-of-cut adjustment gear 6. The drive assembly includes a drive shaft meshing with one end of the rotating shaft and a drive motor assembly for controlling the rotation of the drive shaft. The two planar ends of the depth-of-cut adjustment gear 6 are slidably connected to the side end faces of the rectangular grooves 7.

[0195] Thus, the first carrier 2 and the second carrier 3 can move up and down within the rectangular through groove 101 of the tool holder 1 through the adjustment mechanism.

[0196] The upper cuboid portions of the first support body 2 and the second support body 3 have the same structural dimensions. The depth-of-cut gear 6 is a cylindrical structure with a diameter w1 = w2 = 20 mm, where w2 is the length of the upper end of the first support body 2 or the second support body 3. The groove depth of the rectangular groove 7 is w3 = 1 / 2w2 = 10 mm. The sidewall length of the rectangular groove 7 is w4 = 1 / 4w2 = 5 mm. The width of the rectangular groove 7 is w5 = 2πw2 = 126 mm.

[0197] When the depth of cut needs to be adjusted, the drive assembly is activated, and the depth of cut adjustment gear 6 rotates under the action of the drive assembly. In the initial state, the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 are flush. If the depth of cut adjustment gear 6 rotates clockwise, the first carrier 2 drives the first ball-end cutting edge 4 away from the inner wall of the titanium alloy casting chamber 11, and the second carrier 3 drives the second ball-end cutting edge 5 closer to the inner wall of the titanium alloy casting chamber 11, thereby realizing the adjustment of the distance difference C between the cutting edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5.

[0198] Specifically, a cleaning device is also provided on the double-cutting-point tool. The cleaning device includes a first channel 9 and a second channel 10 for gas and liquid flow on the first carrier 2. Along the cutting direction, the air jet of the first channel 9 and the liquid jet of the second channel 10 are respectively located at the rear end of the ball face of the first ball cutting edge 4 and the second ball cutting edge 5, and are arranged toward the gap between the first ball cutting edge 4 and the second ball cutting edge 5.

[0199] Along the cutting direction, the air jet of the first channel 9 is located below the liquid injection port of the second channel 10. The first channel 9 is used for air circulation, and the second channel 10 is used for cutting fluid circulation.

[0200] The air inlet of the first channel 9 is connected to an air supply device located outside the first carrier 2. The air supply device includes an air delivery pipe for supplying air or nitrogen into the first channel 9. The liquid inlet of the second channel 10 is connected to a liquid supply device, which includes a liquid delivery pipe for supplying cutting fluid into the second channel 10.

[0201] The diameter of the jet nozzle of the first channel 9 is x1 = 1.4 mm, and its jet nozzle air velocity is 10 m / s.

[0202] The diameter of the nozzle of the second channel 10 is x2 = 1.4 mm; the liquid discharge rate of the nozzle is 0.3 m / s.

[0203] When machining with the aforementioned double-point cutting tool, the tool holder 1 is first fixedly connected to the tool shank 17, and the other end of the tool shank 17 is fixedly set inside the base 18, which is mounted on the Z-axis support plate of the machine tool. The diameter of the tool shank 17 is E = 0.35 * E1 = 0.35 × 760 = 266 mm; the length of the tool shank 17 is L = L1 + 5 = 920 + 5 = 925 mm.

[0204] Next, the titanium alloy casting chamber 11 is axially fixed using a clamping fixture, and then the chuck is controlled to rotate at 34 r / min, driving the clamping fixture to rotate. The clamping fixture includes an upper ring 19 and a lower ring 20 fixedly connected to the upper ring 19 via a screw 21. The upper ring 19 and lower ring 20 have stops with a 0.1 mm clearance from the outer surface of the titanium alloy casting chamber 11 to restrict the five degrees of freedom of the titanium alloy casting chamber 11 in the X, Y, Z, A, and B directions. The upper ring 19 is fixed to the end face of the machine tool chuck for placing the titanium alloy casting chamber 11, and the lower ring 20 is fixedly connected to the upper ring 19 via the screw 21, clamping the titanium alloy casting chamber 11 between the upper ring 19 and the lower ring 20 to axially compress the titanium alloy casting chamber 11. The upper ring 19 has an inner diameter j1 = 0.9E1 = 684 mm and an outer diameter j2 = 1.2E1 = 912 mm; the lower ring 20 has an inner diameter j3 = 0.97E1 = 737.2 mm and an outer diameter j4 = 1.2E1 = 912 mm; and the screw 21 has a length g = 1.1L1 = 1012 mm. Both ends of the screw 21 are fitted with nuts, which secure the upper ring 19 and lower ring 20. The nuts are GBT6170 M20 nuts, and are tightened using a torque wrench with a torque value M set to 45 ± 3 N·m. The total clamping force f of the four nuts on the lower ring 总 =4f1=60~64KN.

[0205] Next, the double-cutting-point tool is adjusted to the feed position using the machine tool. The feed position is set at a 45° angle to the lower left side of the inner cavity port of the titanium alloy casting chamber 11. The tool holder 17 is rotated to adjust the tilt angle of the tool holder 1, so that the first support body 2 and the second support body 3 are perpendicular to the end face of the feed position. The depth of cut adjustment gear 6 is rotated clockwise for a period of time. This makes the distance between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 1.1mm.

[0206] Next, the machine tool controls the chuck to rotate counterclockwise at a speed of 34 r / min, thereby driving the inner cavity of the titanium alloy casting chamber 11 to rotate counterclockwise; and controls the tool holder 17 to move via the Z-axis support plate, thereby moving the double-cutting point tool to the tool feeding position.

[0207] Finally, the inner cavity of the titanium alloy casting chamber 11 is machined using the aforementioned double-cutting tool.

[0208] Specifically, during the initial machining of the inner cavity of the titanium alloy casting 11, the first ball-end cutting edge 4 first cuts the inner cavity of the titanium alloy casting 11. At this time, the second ball-end cutting edge 5 is in an idle state. During machining, the titanium alloy casting 11 rotates at a speed of v2 = 34 r / min for a period of time. Then, the tool is axially advanced. At this time, the double-point tool feeds axially at a speed of 0.1 mm / r. During this process, the second ball-end cutting edge 5 cuts the surface processed by the first ball-end cutting edge 4.

[0209] Specifically, during machining, the dual-point cutting tool feeds axially at a speed of 0.1 mm / r, while the titanium alloy casting chamber 11 rotates at a speed of 34 r / min. As the Z-axis support plate axially advances the tool holder 17 into the inner cavity of the titanium alloy casting chamber 11, the first ball-end cutting edge 4 primarily withstands the impact of the irregularly shaped ribs with machining allowances. The second ball-end cutting edge 5 cuts the surface already machined by the first ball-end cutting edge 4. At this time, the first ball-end cutting edge 4 and the second ball-end cutting edge 5 perform synchronous cutting, and the machine tool completes one machining trajectory with a depth of cut Y = a + b. When the first ball-end cutting edge 4 moves axially to near the upper ring 19, the depth of cut adjustment gear 6 is rotated counterclockwise. The rotation time of this depth of cut adjustment gear 6 is... At this point, the first ball-end cutting edge 4 continues cutting, with a depth of cut of v1*t3; after a period of time Then, continue to rotate the depth-of-cut adjusting gear 6 counterclockwise. The rotation time of the depth-of-cut adjusting gear 6 is... During the process, the first ball-end cutting edge 4 continues cutting with a depth of cut of v1*t4. Then, the distance between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is adjusted to a using an adjustment mechanism. At this point, the first ball-end cutting edge 4 is closer to the inner cavity at the bottom of the titanium alloy casting chamber 11 than the second ball-end cutting edge 5. Next, the position of the Z-axis support plate is adjusted by the machine tool in the Y and X axes. During this process, the first ball-end cutting edge 4 cuts the side end face of the inner cavity of the titanium alloy casting chamber 11 near the upper ring 19 until the second ball-end cutting edge 4 contacts the inner wall of the titanium alloy casting chamber 11 and the depth of cut reaches b. Then, the Z-axis support plate is controlled to move axially away from the upper ring 19, thereby reciprocating the cutting of the inner cavity of the titanium alloy casting chamber 11. At this point, the depth of cut of the reciprocating machining trajectory is Y = 2(a + b). When the tool extends axially, the distance between the lower edges of the first ball-end cutting edge 4 and the second ball-end cutting edge 5 is the same as the depth of cut of the first ball-end cutting edge; the double-point tool extends axially at a speed of 0.1 mm / r.

[0210] Specifically, during the cutting process, the cutting fluid supply device is used to cool, lubricate, and remove chips from the dual-cutting-point tool; the outlet diameter X3 = 5 / 4D = 15mm, and the cutting fluid flow velocity at the outlet is 0.3m / s. Simultaneously, the air supply and fluid supply devices are activated to cool, lubricate, and remove chips from the gap between the first ball-end cutting edge 4 and the second ball-end cutting edge 5. Specifically, the nozzle of the cutting fluid delivery pipe consistently sprays cutting fluid towards the ball-end surfaces of the first ball-end cutting edge 4 and the second ball-end cutting edge 5. Simultaneously, the second channel 10 located on the first carrier 2 sprays cutting fluid towards this gap, and the first channel 9 sprays air into this gap.

[0211] Using this method, the processing time for a single piece is 4.5 hours, the service life of the first ball-end cutting edge 4 is 8.2 hours, and the service life of the second ball-end cutting edge 5 is 8.8 hours.

[0212] Comparative Example 1:

[0213] A machining tool for the inner cavity of a titanium alloy casting chamber, which differs from Example 1 in that...

[0214] A carrier is fixedly connected to the tool holder, and a ball-end cutting edge is fixedly connected to the lower end of the carrier. The depth of cut 'a' of the ball-end cutting edge is fixed at 1 mm. The depth of cut for one trajectory of the machine tool is 'a'. The working rake angle 'α' of the ball-end cutting edge is fixed at 1°.

[0215] When machining with the aforementioned tool, the ball-end cutting edge processes the surface to be machined within the inner cavity of the titanium alloy casting chamber, bearing the impact of ribs with irregular machining allowances. During machining, the tool feeds axially at a speed of 0.1 mm / r, while the titanium alloy casting chamber rotates at 34 r / min. When the ball-end cutting edge moves axially close to the upper ring, the position of the Z-axis support plate is adjusted in the Y and X axes of the machine tool, thereby adjusting the ball-end cutting edge to move closer to the end face of the inner cavity of the titanium alloy casting chamber, with a depth of cut of 'a'. The Z-axis support plate then moves the tool away from the upper ring, performing reciprocating cutting. After the tool holder moves 5 times, i.e., when the total depth of cut along the machining trajectory is 5a, the cutting task is completed. During the cutting process, a cutting fluid supply device is used to cool, lubricate, and remove chips from the ball-end cutting edge.

[0216] The machining tool was used to machine the inner cavity of the titanium alloy casting chamber. The machining time for a single piece was 8.5 hours, and the service life of the ball end cutting edge was 20-30 minutes.

[0217] Compared with Comparative Example 1, the present invention significantly improves processing efficiency, tool life, and reduces manual intervention. See below for details.

[0218] Table 1. Processing effects of Example 1 and Comparative Example 1

[0219] Example 1 Comparative Example 1 Processing time for a single part 4.5h 8.5h First ball end cutting edge life 8.2h 20-30min Second ball end cutting edge life 8.8h -

[0220] As shown in Table 1, the processing time for a single part in this invention is 4.5 hours, which is much shorter than the processing time of 8.5 hours for a single part in Comparative Example 1. This demonstrates that the dual-point cutting tool of this invention can significantly improve processing efficiency.

[0221] During the processing, the continuous processing time of the cutting edge of the present invention is not less than 8.2 hours and can reach up to 8.8 hours, which is much higher than the continuous processing time of 20-30 minutes of the cutting edge in Comparative Example 1. It can be seen that the use of the double-cutting point tool of the present invention can significantly improve the service life of the tool. There is no need to replace the tool during the processing, which improves the processing efficiency and reduces the human intervention rate.

[0222] Therefore, the present invention utilizes the aforementioned dual-point cutting tool to perform intermittent and efficient turning of the inner cavity of the titanium alloy casting chamber, which can effectively solve the problem of frequent impact of parts on the tool, resulting in rapid tool chipping or wear, and can also effectively improve cutting efficiency.

[0223] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-point cutter for machining titanium alloy pod cavities, characterized by: The tool includes a tool holder, a first carrier and a second carrier installed on the tool holder, and a first ball nose cutting edge installed on the lower end of the first carrier and a second ball nose cutting edge installed on the lower end of the second carrier; The first ball nose cutting edge and the second ball nose cutting edge are arranged in parallel and cut synchronously along the cutting direction; The lower edges of the first ball nose cutting edge and the second ball nose cutting edge are not parallel; The lower end of the first carrier is provided with a first installation groove for installing the first ball nose cutting edge, and the lower end of the second carrier is provided with a second installation groove for installing the second ball nose cutting edge; The inclination of the bottom surface of the first installation 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 installation 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 working rake angle β of the second ball nose cutting edge is greater than the working rake angle α of the first ball nose cutting edge; During cutting, 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, 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.

2. The two-shear-point tool of claim 1, wherein: The cutting depth a of the first ball nose cutting edge satisfies: 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.

3. The two-saddle point tool of claim 2, wherein: The cutting depth b of the second ball nose cutting edge satisfies: 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 2.6-8.9; D is the diameter of the second ball head cutting edge, the value range is 6-12 mm.

4. The dual point cutter of claim 1, wherein: The working rake angle α of the first ball nose 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 nose 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 14.2-25.3; and b is the cutting depth of the second ballnose cutting edge.

5. The two-point cutter of any of claims 1-4, wherein: A rectangular through groove is formed in the tool holder, and the first carrier and the second carrier are inserted into the rectangular through groove and movably connected to the tool holder.

6. The two-saddle point tool of claim 5, wherein: A cutting depth adjusting mechanism is further provided for adjusting the cutting depth of the first ball nose cutting edge and the second ball nose cutting edge; The cutting depth adjusting mechanism includes a cutting depth adjusting gear and a driving device for controlling the rotation of the cutting depth adjusting gear. The driving device drives the first carrier and the second carrier to move up and down in the rectangular through groove of the tool holder through the meshing of the cutting depth adjusting gear and the first carrier and the second carrier.

7. The two-saddle point tool of claim 6, wherein: The first carrier and the second carrier are respectively provided with a rectangular groove on the surface in contact with each other, and the rectangular grooves of the first carrier and the second carrier form an internal chamber for accommodating the cutting depth adjusting gear. The cutting depth adjusting gear is arranged in the internal chamber formed by the rectangular grooves of the first carrier and the second carrier. The bottom surface of the rectangular groove is a tooth surface, and the first carrier and the second carrier are connected to the cutting depth adjusting gear through the meshing of the tooth surface.

8. The two-point cutter of any of claims 1-7, wherein: A cleaning device is further provided for cooling, lubricating and removing residual metal chips at the gap between the adjacent end faces of the first ball nose cutting edge and the second ball nose cutting edge.

9. The two-saddle point tool of claim 8, wherein: The cleaning device includes a first channel and a second channel formed in the first carrier for the flow of gas and liquid. Along the cutting direction, the gas outlet of the first channel and the liquid outlet of the second channel are respectively located at the rear end of the ball head surface of the first ball nose cutting edge and the second ball nose cutting edge, and are arranged towards the gap between the first ball nose cutting edge and the second ball nose cutting edge.

10. The two-saddle point tool of claim 9, wherein: Along the cutting direction, the gas outlet of the first channel is located at the lower end of the liquid outlet of the second channel. The gas is air or nitrogen, and the liquid is a cutting fluid. The gas is air or nitrogen, and the liquid is a cutting fluid. The gas is air or nitrogen, and the liquid is a cutting fluid. The gas is

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