A fall type high-precision milling cutter

Abstract

The application discloses a fall type high-precision milling comprehensive milling cutter, which comprises a cutter body, a peripheral edge and cutter teeth, the peripheral edge is arranged at the front section of the cutter body, and the cutter teeth are arranged at the front end of the peripheral edge, characterized in that: the edge of the cutter tooth tip part is provided with a first protection angle surface, a second protection angle surface and a third protection angle surface, the intersection end points of the first, second and third protection angle surfaces form an intersection angle tool tip, the front end face of the cutter tooth tip part is provided with a tool tip facet, and the tool tip facet and the intersection angle tool tip have a finishing height fall, so that the tool tip facet is subjected to fine grinding and finishing machining. Through the improvement of the structure of the cutter tooth tip part, the intersection angle tool tip and the tool tip facet with a slight height fall are formed, the milling cutter machining performance is improved, and the high-precision face milling machining can be performed on low-carbon steel, stainless steel and the like (soft steel with HRC less than 40 degrees).

Description

TECHNICAL FIELD

[0001] The present application relates to the structure of a comprehensive milling cutter, in particular to a fall type high-precision milling comprehensive milling cutter. BACKGROUND

[0002] The traditional milling cutter, the tip of the tooth tip end and the end face adopt flush structure, such milling cutter in processing low carbon steel (soft steel) with Rockwell hardness HRC below 40, generally can only carry out rough machining with surface roughness above Ra1.6. If you want to achieve lower roughness value and better smoothness, you must also use a grinding machine for fine grinding. And because the tip of the tooth tip end is flush with the end face, the stress is concentrated during cutting, the stress is uneven, repeated cutting is easy to produce, which leads to unstable surface finish and roughness, and seriously affects the service life of the milling cutter and product quality. SUMMARY

[0003] In view of the above shortcomings, the purpose of the present application is to provide a fall type high-precision milling comprehensive milling cutter, improve the structure of the tooth tip end, form the intersection angle of the tip with the tip facet with fine height difference, and improve the machining performance of the milling cutter. The low carbon steel (soft steel) can be machined with high-precision surface milling.

[0004] The technical scheme adopted by the present application is: a fall type high-precision milling comprehensive milling cutter, comprising a cutter body, a peripheral edge and a tooth, the peripheral edge is arranged at the front of the cutter body, and the tooth is arranged at the front end of the peripheral edge.

[0005] The edge of the tooth tip end is provided with a first protection angle surface, a second protection angle surface and a third protection angle surface, the intersection end points of the first, second and third protection angle surfaces form an intersection angle tip, the front end face of the tooth tip end is provided with a tip facet, and the tip facet and the intersection angle tip have a fine height difference, so that the tip facet is finely ground and polished.

[0006] It should be noted that the intersection angle tip is because the first protection angle surface, the second protection angle surface and the third protection angle surface are machined on the edge of the tooth tip end, and the intersection angle tip is formed by the intersection of each protection angle surface (or edge) (that is, the new tool tip angle is formed by the tool edge rake edge, the secondary angle edge and the end tooth bottom edge). Because of the existence of each protection angle surface, the tip facet and the intersection angle tip form a fine height difference. In this way, the tip works and performs rough cutting, leaving a small amount of residual, and the tip facet is polished and ground to ensure the smoothness of the milling cutter.

[0007] It also needs to be explained here that for the first protection angle section, the second protection angle section, the third protection angle section, it is not necessarily an absolute plane (i.e. cross section), but it is allowed that one of the protection angle sections has a certain degree of inclination or arc degree at the front end when forming the intersection angle tool tip, the purpose is to better make the intersection of the first, second, third protection angle section edge end point form the intersection angle tool tip. Of course, the three protection angle sections are at least the number, and it does not exclude that four or even five protection angle sections can be used to form the intersection angle tool tip through the intersection end points of these protection angle sections. Although the use of four or even five protection angle sections will reduce the strength of the intersection angle tool tip to some extent, these schemes are feasible, and they also include at least three protection angle sections. In short, the purpose of this design is to process the three edge protection chamfers of the tool edge rake angle, the secondary angle edge, and the end tooth bottom edge while forming a new tool tip angle (i.e. intersection angle tool tip), and to make the new tool tip angle and the tool tip flat have a slight difference.

[0008] As a preferred scheme, the first edge line and the second edge line of the tool tip flat correspond to the first protection angle section and the second protection angle section respectively, and the length of the first edge line and the second edge line of the tool tip flat is 5%-7% of the diameter of the tool body; the finishing height difference between the tool tip flat and the intersection angle tool tip is 0.002-0.01mm, so that the tool tip flat is finely ground and polished. The tool tip flat as a finishing structure plane, the length, width and size should not be too large, and 5%-7% of the diameter of the tool body is the most preferred; moreover, the height difference between the tool tip flat and the intersection angle tool tip can only be a slight height difference, otherwise it cannot achieve the finishing effect, and the height difference of 0.002-0.01mm is the most preferred. Of course, if the tool body diameter is relatively large, the finishing height difference is slightly larger than 0.01mm, which is also feasible, but it cannot be too large, otherwise it will affect the finishing effect. In addition, such a setting has another advantage: on the basis of the slight height difference between the tool tip flat and the intersection angle tool tip, the first edge line and the second edge line are associated with the first protection angle section and the second protection angle section, so that the first edge line and the second edge line are used as the transition edges of the tool tip flat and the first protection angle section and the second protection angle section, respectively, to play the role of edge cutting edge, further improving the finishing effect of the tool tip flat. In addition, it also needs to be explained here that the height difference between the tool tip flat and the intersection angle tool tip is formed because of the first, second, and third protection angle sections (i.e. the chamfer of the three edges), so the chamfer width of the three edges is also 0.002-0.01mm.

[0009] As a preferred solution, the tool nose facet is a triangular tool nose facet, wherein the first edge line and the second edge line of the tool nose facet are equal in length. The tool nose facet is subjected to wear rules during finishing machining, and the closer to the first edge line and the second edge line, the wider and more serious the wear. Therefore, the tool nose facet is designed as a triangular tool nose facet to adapt to the wear rules during machining. Moreover, it is emphasized that the first edge line and the second edge line of the tool nose facet are controlled to be 5%-7% of the diameter of the tool body, and the triangular design is also an important reason for optimizing the chip removal of the tool nose facet during finishing machining. If the first edge line and the second edge line of the tool nose facet are too long, the tool nose facet is too wide, and the chip extrusion problem is prone to occur during machining, which not only affects the machining effect, but also affects the service life of the tool nose facet.

[0010] As a preferred solution, the vertex of the triangular tool nose facet and the intersection angle tool nose are located at the two end points of a new edge formed by the intersection of the first protective corner surface and the second protective corner surface. The vertex of the triangular tool nose facet is the cutting point during finishing machining of the tool nose facet, and when it is located at the two ends of the same edge with the intersection angle tool nose, the edge functions as a cutting micro-edge, which greatly improves the machining effect. The vertex of the triangular tool nose facet and the intersection angle tool nose are located at the two end points of a new edge formed by the intersection of the first protective corner surface and the second protective corner surface, which functions as a cutting micro-edge and can be used for opening and cutting, which is an excellent optimized structure.

[0011] As a preferred solution, the peripheral edge includes four spirally distributed edges, and the tool teeth include a main tooth group and a secondary tooth group which are cross-distributed; the main tooth group includes a first main tooth and a second main tooth, and the secondary tooth group includes a first secondary tooth and a second secondary tooth; wherein the first main tooth and the second main tooth are high teeth, and the first secondary tooth and the second secondary tooth are low teeth. The technical improvement of the intersection angle tool nose and the tool nose facet at the tip end is applicable to a milling cutter with two or more peripheral edges. However, it is a better choice to apply it to a four-edge milling cutter. The main tooth group and the secondary tooth group are designed as high teeth and low teeth, so that the tool nose facet of the high teeth works first, and the tool nose facet of the low teeth works immediately after the tool nose facet of the high teeth is worn out, which greatly improves the machining life of the finishing milling cutter. Moreover, it is worth mentioning that even if the tool nose facets of the high teeth and the low teeth are worn out, the milling cutter can still be used for rough milling, although it cannot achieve high smoothness, but it can achieve basic machining accuracy like ordinary cutters. In this way, the service life of the drop-type high-precision milling comprehensive milling cutter can be more than several dozen times of that of ordinary milling cutters.

[0012] As a preferred solution, the first main tooth and the second main tooth have a height difference between the tip flat of the first main tooth, the second main tooth and the tip flat of the first secondary tooth, the second secondary tooth, wherein the tip flat of the first main tooth, the second main tooth is higher than the tip flat of the first secondary tooth, the second secondary tooth by 0.1-0.3mm. The area of the tip flat should not be too large, and the height difference between the tip flat of the high tooth and the tip flat of the low tooth should not be too large, so after the tip flat of the high tooth is worn by 0.1-0.3mm, the tip flat of the low tooth should enter the work. Otherwise, it will cause the extrusion of the chip due to the increase of the area of the tip flat after wear. Therefore, the height difference between the tip flat of the high tooth and the tip flat of the low tooth should be controlled within 0.1-0.3mm.

[0013] As a preferred solution, the peripheral edge is of unequal division, unequal spiral, and variable pitch structure, so that with the center of the cross section of the cutter body as the center, the angle between the intersection angle tip of the first main tooth and the intersection angle tip of the first secondary tooth is 95°, the angle between the intersection angle tip of the first secondary tooth and the intersection angle tip of the second main tooth is 85°, the angle between the intersection angle tip of the second main tooth and the intersection angle tip of the second secondary tooth is 95°, and the angle between the intersection angle tip of the second secondary tooth and the intersection angle tip of the first main tooth is 85°. The peripheral edge is more dispersed in cutting stress, improving the machining effect and service life of the cutter.

[0014] As a preferred solution, the core diameter of the peripheral edge section of the cutter body is tapered with a small front end and a large tail end, improving the overall strength of the cutter.

[0015] As a preferred solution, the peripheral edge is a circular arc clearance angle, which improves the cutting performance and stress strength of the peripheral edge and ensures the cutting effect of the peripheral edge.

[0016] As an optional solution, only the first main tooth and the second main tooth are provided with an intersection angle tip and a tip flat at the tip end, and the first secondary tooth and the second secondary tooth are not provided with an intersection angle tip and a tip flat at the tip end; the tip flat of the first main tooth and the second main tooth has a height difference between the tip flat of the first main tooth, the second main tooth and the end face of the first secondary tooth, the second secondary tooth, wherein the tip flat of the first main tooth, the second main tooth is higher than the end face of the first secondary tooth, the second secondary tooth by 0.1-0.3mm. It should be noted that this design is a replacement solution based on the technical solution that both the high tooth and the low tooth are provided with an intersection angle tip and a tip flat. Although the service life of the cutter is slightly worse, since the high tooth (i.e. the first main tooth and the second main tooth) is provided with an intersection angle tip and a tip flat at the tip end, it still can play a role in rough chewing and fine repair.

[0017] The application has the following advantages: the first protection angle surface, the second protection angle surface and the third protection angle surface are arranged at the cutter tooth tip end part, the edges of the surfaces are intersected, the intersection angle cutter tip is formed at the end point, the cutter tip small plane is arranged on the front end surface of the cutter tooth tip end part, the slight height difference between the cutter tip small plane and the intersection angle cutter tip is utilized, the milling cutter processing performance is improved, the low carbon steel (soft steel) can be processed by high-precision milling, the surface roughness is less than RA0.4, the brightness reaches the mirror surface, and the service life of the cutter is also significantly improved.

[0018] The application is further described below in combination with the specific embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure diagram of the fall type high-precision milling comprehensive milling cutter.

[0020] Figure 2 It is an enlarged structure diagram of the cutter tooth tip end part.

[0021] Figure 3 It is a side view structure diagram of the cutter tooth tip end part. Figure 1

[0022] Figure 4 It is a height difference diagram of the cutter tip small planes of the high tooth and the low tooth.

[0023] Figure 5 It is a C part local enlarged diagram of the cutter tooth tip end part. Figure 3

[0024] Figure 6 It is a front end surface structure diagram of the fall type high-precision milling comprehensive milling cutter.

[0025] Figure 7 It is a B part local enlarged diagram of the cutter tooth tip end part. Figure 6

[0026] It is a cross section diagram of the fall type high-precision milling comprehensive milling cutter. Figure 8

[0027] It is a cross section structure diagram of the peripheral edge. Figure 9

[0028] It is a cutter tip small plane loss diagram during processing. Figure 10

[0029] ​​​In the figure: tool body 1; peripheral edge 2; tool tooth 3; first protective corner surface 31; second protective corner surface 32; third protective corner surface 33; intersection tool tip 34; tool tip facet 35; first edge line 351; second edge line 352; first main tooth 3a; second main tooth 3b; first secondary tooth 3c; second secondary tooth 3d; first wire frame area 35a; second wire frame area 35b; first and second protective corner surface intersection new edge 4. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings). If the certain posture changes, the directional indications also change accordingly.

[0032] In addition, if the embodiments of the present application involve descriptions of “first” or “second”, etc., the descriptions of “first” or “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is also not within the protection scope of the present application.

[0033] Reference Figures 1 to 10 The drop-type high-precision milling comprehensive milling cutter provided by the embodiment includes a tool body 1, a peripheral edge 2 and a tool tooth 3. The peripheral edge 1 is arranged at the front section of the tool body 1, and the tool tooth 3 is arranged at the front end of the peripheral edge 2.

[0034] The three edges of the cutting edge rake edge, the minor edge, and the end tooth bottom edge are chamfered, so that the first protection corner surface 31, the second protection corner surface 32, and the third protection corner surface 33 are formed at the edge of the tooth tip end part, the edge intersection end point of the first, second, and third protection corner surfaces forms the intersection angle tool tip 34, the front end surface of the tooth tip end part is provided with a tool tip facet 35, and the tool tip facet 35 has a fine height difference with the intersection angle tool tip 34, so that the tool tip facet 35 is polished and finely ground (that is, when the milling cutter is processed, the tool tip facet plays a role of fine polishing and grinding).

[0035] It should be noted that the intersection angle tool tip is formed because the first protection corner surface, the second protection corner surface, and the third protection corner surface are processed at the edge of the tooth tip end part, and because the presence of each protection corner surface, a slight height difference is formed between the tool tip facet and the intersection angle tool tip. In this way, the tool tip works and performs rough machining, leaving a slight excess, and the tool tip facet is polished and finely ground to ensure the smoothness of the milling cutter processing.

[0036] It should also be noted that the first protection corner surface, the second protection corner surface, and the third protection corner surface are not necessarily absolute planes (i.e., cross sections), but one of the protection corner surfaces can have a certain degree of inclination or curvature at the front end when forming the intersection angle tool tip. The purpose is to better form the intersection angle tool tip at the edge intersection end point of the first, second, and third protection corner surfaces. Of course, the three protection corner surfaces are at least the number, and it does not exclude that four or even five protection corner surfaces can be used to form the intersection angle tool tip through the intersection end points of these protection corner surfaces. Although four or even five protection corner surfaces are used, it will reduce the strength of the intersection angle tool tip to some extent, but these schemes are feasible and also include at least three protection corner surfaces. In summary, the purpose of the design is to process the three edge protection chamfers of the cutting edge rake edge, the minor edge, and the end tooth bottom edge, form a new tool tip angle (i.e., the intersection angle tool tip), and have a slight difference between the new tool tip angle and the tool tip facet.

[0037] Specifically, referring to Figure 2 , 5, 7, the first edge line 351 and the second edge line 352 of the nose facet 35 correspond to the first protection corner surface 31 and the second protection corner surface 32 respectively (i.e., the nose facet intersects the first protection corner surface and the second protection corner surface respectively, and has a common edge respectively), and the length of the first edge line 351 and the second edge line 352 of the nose facet is 5%-7% of the diameter of the tool body; the height difference between the nose facet 35 and the intersecting angle nose 34 is 0.002-0.01mm, so that the nose facet is finely ground and polished. The nose facet as a fine polishing structure plane, the length, width and size should not be too large, preferably 5%-7% of the diameter of the tool body (specifically in this embodiment, the diameter of the tool body is 10mm, and the first edge line and the second edge line are 0.6mm); moreover, the height difference between the nose facet and the intersecting angle nose can only be a slight height difference, otherwise the fine polishing effect cannot be achieved, wherein the height difference of 0.002-0.01mm is the most preferred. Of course, if the tool body diameter is relatively large, the fine polishing height difference is slightly larger than 0.01mm, which is also feasible, but it cannot be too large, otherwise it will affect the fine polishing effect. In addition, such a setting also has another advantage: on the basis of the slight height difference between the nose facet and the intersecting angle nose, the first edge line and the second edge line are associated with the first protection corner surface and the second protection corner surface respectively, so that the first edge line and the second edge line respectively serve as the transition edges of the nose facet and the first protection corner surface and the second protection corner surface, and play the role of edge cutting edge, improving the fine polishing effect of the nose facet. In addition, it should be noted here that the height difference between the nose facet and the intersecting angle nose is formed because of the first, second and third protection corner surfaces (i.e., the chamfers of the three edges), and therefore the chamfer width of the three edges is also 0.002-0.01mm.

[0038] More specifically, the nose facet 35 is a triangular nose facet, wherein the length of the first edge line 351 and the second edge line 352 of the nose facet 35 is equal, so that the nose facet forms an isosceles triangle. The nose facet is finely polished, and there is a wear rule that the closer to the first edge line, the wider and more serious the wear. Therefore, designing the nose facet as a triangular nose facet can well adapt to the wear rule during machining. Moreover, it should be emphasized here that the reason why the length of the first edge line and the second edge line of the nose facet is controlled to be 5%-7% of the diameter of the tool body and the triangular design is adopted is that it optimizes the chip removal problem of the nose facet during fine polishing. If the length of the first edge line and the second edge line of the nose facet is too long, the nose facet is too wide, and during machining, it will easily cause the problem of extrusion of chips, which not only affects the machining effect, but also affects the service life of the nose facet.

[0039] Specifically, the vertex of the triangular nose corner facet 35 and the intersection corner 34 are located at the two end points of the new edge formed by the intersection of the first and second protective corner facets 31 and 32 respectively (the first and second protective corner facet intersection new edge 4). The vertex of the triangular nose corner facet is the cutting point when the nose corner facet is refined, and when it is at the two ends of the same edge with the intersection corner, the edge acts as a cutting micro-edge, greatly improving the machining effect. The vertex of the triangular nose corner facet and the intersection corner formed by the intersection of the first and second protective corner facets respectively serve as the cutting micro-edge, allowing for opening and cutting, and is an excellent optimized structure.

[0040] In the present embodiment, the peripheral edge 2 comprises four spirally distributed, the tooth 3 comprises a main tooth group and a secondary tooth group which are intersected, the main tooth group comprises a first main tooth 3a and a second main tooth 3b, and the secondary tooth group comprises a first secondary tooth 3c and a second secondary tooth 3d; wherein the first main tooth 3a and the second main tooth 3b are high teeth, and the first secondary tooth 3c and the second secondary tooth 3d are low teeth. The technical improvement of setting the intersection corner 34 and the nose corner facet 35 at the tip part is suitable for milling cutters with two or more peripheral edges. However, it is a better choice to apply it to a four-edge milling cutter. The main tooth group and the secondary tooth group are designed as high teeth and low teeth, so that the nose corner facet of the high tooth works first, and after the nose corner facet of the high tooth is worn out, the nose corner facet of the low tooth works immediately, so that the machining life of the milling cutter can be greatly improved. Moreover, it is also worth mentioning that even if the nose corner facets of the high teeth and the low teeth are all worn out, the milling cutter can still be used for rough milling, although it cannot achieve very high smoothness, but it can achieve basic machining accuracy like ordinary tools. In this way, the life of the drop-type high-precision milling comprehensive milling cutter can be more than several dozen times of that of ordinary milling cutters.

[0041] Specifically, referring to the accompanying drawings Figure 4 , 6 , the nose corner facet of the first main tooth 3a and the second main tooth 3b has a height difference with the nose corner facet of the first secondary tooth 3c and the second secondary tooth 3d, wherein the nose corner facet of the first main tooth 3a and the second main tooth 3b is 0.1-0.3mm higher than the nose corner facet of the first secondary tooth 3c and the second secondary tooth 3d (0.2mm in the present embodiment). The area of the nose corner facet should not be too large, and the height difference between the nose corner facets of the high teeth and the low teeth should not be too large, so that after the nose corner facet of the high tooth is worn out by 0.1-0.3mm, the nose corner facet of the low tooth should enter the work. Otherwise, the extrusion problem will occur due to the increase in the area of the nose corner facet after it is worn out. Therefore, the height difference between the nose corner facets of the high teeth and the low teeth should be controlled within 0.1-0.3mm.

[0042] Specifically, referring to the accompanying drawings Figure 6 ,8 , the peripheral edge 2 is of unequal division, unequal spiral, variable pitch structure, so that the angle between the intersection angle of the first main tooth 3a and the intersection angle of the first secondary tooth 3c is 95°, the angle between the intersection angle of the first secondary tooth 3c and the intersection angle of the second main tooth 3b is 85°, the angle between the intersection angle of the second main tooth 3b and the intersection angle of the second secondary tooth 3d is 95°, and the angle between the intersection angle of the second secondary tooth 3d and the intersection angle of the first main tooth 3a is 85°. The peripheral edge is more dispersed in stress during cutting, improving the machining effect and service life of the tool.

[0043] Specifically, referring to the accompanying drawings Figure 8 , the core diameter of the tool body 1 at the peripheral edge section is tapered from small at the front end to large at the tail end. For example, in this embodiment, if the core diameter of the peripheral edge section at the front end is 6.9mm, the core diameter of the peripheral edge section at the tail end can be about 7mm. Such design can improve the overall strength of the tool.

[0044] Specifically, referring to the accompanying drawings Figure 9 , the peripheral edge is a circular arc clearance angle. The cutting performance and stress strength of the peripheral edge are improved to ensure the cutting effect of the peripheral edge.

[0045] The fall type high-precision milling comprehensive milling cutter provided in the embodiment has the following advantages:

[0046] I. The three edge chamfers (0.02mm-0.04mm) of the blade rake edge, the secondary angle edge and the end tooth bottom edge form a new tool tip angle (i.e. intersection angle tool tip), and a tool tip facet is provided, wherein the fall of the intersection angle tool tip and the tool tip facet is 0.03mm-0.09mm.

[0047] II. Referring to the accompanying drawings Figure 10 , the tool tip facet 35 is divided into a first line frame area 35a and a second line frame area 35b. In actual processing, the contact surface along the positive direction of X determines the roughness of the processed material surface. The contact surface along the negative direction of Z determines the durability of the processed material surface, i.e. the service life.

[0048] III. The tool nose flat 35 is designed as an isosceles triangle with a side length of 0.6 mm (6% of the tool diameter (D)). In actual use, the first line frame area 35a of the tool nose flat 35 first participates in the finishing action of the production material, plays a polishing role, and also has real-time wear. Taking a tool with a tool body diameter of 10 mm as an example, at this moment the machining parameters are: rotational speed (S1) = 4500, cutting width (ae) = 70%*tool diameter (D), feed (F) = 1000. When the surface roughness effect decreases, we only need to increase the rotational speed (S2) = S1*(1.3-1.5), that is, the rotational speed is adjusted to 6000-7000 rpm, so that the second line frame area 35b of the tool nose flat 35 continues to replace the first line frame area 35a to polish the work, so as to maintain the roughness effect and prolong the polishing service life of the tool.

[0049] As another embodiment: only the first main tooth and the second main tooth are provided with an intersection angle tool nose and a tool nose flat at the tip portion, and the first secondary tooth and the second secondary tooth are not provided with an intersection angle tool nose and a tool nose flat at the tip portion; the tool nose flat of the first main tooth and the second main tooth has a height difference with the end face of the first secondary tooth and the second secondary tooth, wherein the tool nose flat of the first main tooth and the second main tooth is higher than the end face of the first secondary tooth and the second secondary tooth by 0.1-0.3 mm. It should be noted that this design is a replacement scheme based on the technical scheme in which the high tooth and the low tooth are both provided with an intersection angle tool nose and a tool nose flat. Although the service life of the tool is slightly worse, the high tooth (i.e. the first main tooth and the second main tooth) is still capable of roughing and finishing due to the intersection angle tool nose and the tool nose flat provided at the tip portion.

[0050] The present application is not limited to the above-mentioned embodiments, and other kinds of drop-type high-precision milling comprehensive milling cutters obtained by using the same or similar technical features as the above-mentioned embodiments of the present application are also within the scope of protection of the present application.

Claims

1. A high-precision fall-type milling cutter, comprising a cutter body, a peripheral edge and cutter teeth, the peripheral edge is arranged at the front section of the cutter body, and the cutter teeth are arranged at the front end of the peripheral edge, characterized in that: The edge of the tool tip end part is provided with a first protection angle surface, a second protection angle surface and a third protection angle surface, the intersection points of the first, second and third protection angle surfaces form an intersection angle tool tip, the front end surface of the tool tip end part is provided with a tool tip facet, the tool tip facet and the intersection angle tool tip have a finishing height difference, so that the tool tip facet is finely ground and polished; the first and second edge lines of the tool tip facet correspond to the first and second protection angle surfaces respectively, the lengths of the first and second edge lines of the tool tip facet are 5%-7% of the diameter of the tool body; the finishing height difference between the tool tip facet and the intersection angle tool tip is 0.002-0.01mm.

2. The plunge high-precision milling cutter according to claim 1, characterized in that: The tool tip facet is a triangular tool tip facet, wherein the lengths of the first and second edge lines of the tool tip facet are equal.

3. The plunge high-precision milling cutter according to claim 2, characterized in that: The vertex of the triangular tool tip facet and the intersection angle tool tip are located at the two endpoints of a new edge formed by the intersection of the first and second protection angle surfaces.

4. The plunge high-precision milling cutter of claim 1, wherein: The peripheral edge includes four spiral distributions, the tool teeth include a main tooth group and a secondary tooth group which are cross-distributed; the main tooth group includes a first main tooth and a second main tooth, and the secondary tooth group includes a first secondary tooth and a second secondary tooth; wherein the first and second main teeth are high blades, and the first and second secondary teeth are low blades.

5. The plunge high-precision milling cutter according to claim 4, characterized in that: The tool tip facets of the first and second main teeth have a height difference with the tool tip facets of the first and second secondary teeth, wherein the tool tip facets of the first and second main teeth are higher than the tool tip facets of the first and second secondary teeth by 0.1-0.3mm.

6. The plunge high-precision milling cutter of claim 4, wherein: The peripheral edge is of unequal division, unequal spiral and variable pitch structure, so that with the center of the circle of the cross section of the tool body as the center, the angle between the intersection angle tool tip of the first main tooth and the intersection angle tool tip of the first secondary tooth is 95°, the angle between the intersection angle tool tip of the first secondary tooth and the intersection angle tool tip of the second main tooth is 85°, the angle between the intersection angle tool tip of the second main tooth and the intersection angle tool tip of the second secondary tooth is 95°, and the angle between the intersection angle tool tip of the second secondary tooth and the intersection angle tool tip of the first main tooth is 85°.

7. The plunge high-precision milling cutter of claim 4, wherein: The core diameter of the tool body at the peripheral edge section is tapered with a small front end and a large tail end.

8. The plunge high-precision milling cutter of claim 4, wherein: The peripheral edge is a circular arc clearance angle.

9. The plunge high-precision milling cutter of claim 4, wherein: Only the first and second main teeth are provided with an intersection angle tool tip and a tool tip facet at the tip end part, and the first and second secondary teeth are not provided with an intersection angle tool tip and a tool tip facet at the tip end part; the tool tip facets of the first and second main teeth have a height difference with the end surface of the first and second secondary teeth, wherein the tool tip facets of the first and second main teeth are higher than the end surface of the first and second secondary teeth by 0.1-0.3mm.

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