Drilling and milling end mill

Abstract

The invention discloses a drilling and milling end mill, and belongs to the technical field of machining cutters. A W-shaped bottom edge cutting long edge is formed by the bottom edge outer side edge, the transition arc edge and the bottom edge inner side edge in the two bottom edge long edge parts, the bottom edge outer side edge is higher than the bottom edge inner side edge in the central axis direction of the cutting part, and a part of the bottom edge short edge is distributed on the side, away from the clamping part, of the bottom edge outer side edge. And the other part of the short edge of the bottom edge is distributed on one side, close to the clamping part, of the transition arc edge and the inner side edge of the bottom edge. Thus, during drilling, the transition arc edge, the bottom edge inner side edge and the bottom edge short edge mainly act, the bottom edge outer side edge basically does not participate in cutting, drilling cutting resistance is reduced, meanwhile, the length of the bottom edge short edge participating in drilling and milling, the transition arc edge and the bottom edge inner side edge is short, and the bottom edge short edge and the transition arc edge and the bottom edge inner side edge are distributed in different directions of the bottom of the cutting part respectively. And therefore, the generated cuttings are smaller, and the cuttings can be conveniently discharged from the long edge chip flutes and the short edge chip flutes of the bottom edge.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical processing tools, and in particular to a drilling and milling end mill. Background Art

[0002] In the product processing of the mold industry and the general machinery industry, rough processing of some concave cavities is often involved. For cavities with a processing depth of more than one times the tool diameter, most of the workpiece material needs to be removed. In order to ensure processing efficiency, rough processing generally uses high-efficiency processing end mills with three or four edges or more. However, when the end mill is used for cavity processing, it usually uses a spiral cut or a bevel cut, which takes a long time to process and has a low processing efficiency. Alternatively, the end mill is used to expand the milling after drilling, which is more efficient than the first two methods, but it adds a drilling process and requires an additional tool to complete the processing, increasing the manufacturing cost. Summary of the invention

[0003] The embodiment of the present application provides a drilling and milling end mill, which can solve the problem that the end mill in the prior art cannot have both drilling and milling functions. The technical solution is as follows:

[0004] In one aspect, a drilling and milling end mill is provided, the drilling and milling end mill comprising:

[0005] A clamping portion, and a cutting portion fixedly connected to one end of the clamping portion, wherein the bottom of the cutting portion has: a group of bottom blade long edge portions and a group of bottom blade short edge portions;

[0006] A group of bottom blade long blade portions comprises: two bottom blade long blade portions symmetrically distributed along the central axis of the cutting portion, the bottom blade long blade portions having: a bottom blade outer blade, a transition arc blade and a bottom blade inner blade connected in sequence, the first end of the bottom blade outer blade being used to connect with the circumferential blade of the cutting portion, the two ends of the transition arc blade being respectively connected with the second end of the bottom blade outer blade and the second end of the bottom blade inner blade, the first end of the bottom blade inner blade being distributed in the central area of ​​the cutting portion, the second end of the bottom blade outer blade being away from the clamping portion relative to the first end of the bottom blade outer blade, and the second end of the bottom blade inner blade being away from the clamping portion relative to the first end of the bottom blade inner blade; and the acute angle formed between the bottom blade outer blade and the target plane is greater than the angle between the bottom blade inner blade and the target plane, the target plane being a plane perpendicular to the central axis of the cutting portion;

[0007] A group of bottom blade short blade portions comprises: two bottom blade short blade portions distributed on both sides of the two bottom blade long blade portions, the bottom blade short blade portions having bottom blade short blades, the first ends of the bottom blade short blades being used to connect with the circumferential blade of the cutting portion, the first ends of the bottom blade short blades being away from the clamping portion relative to the second ends of the bottom blade short blades, and in the direction along the central axis of the cutting portion, the first ends of the bottom blade short blades are away from the clamping portion relative to the first ends of the bottom blade outer blades, and the second ends of the bottom blade short blades are close to the clamping portion relative to the vertex of the transition arc blade;

[0008] Among them, the bottom blade long edge of the bottom blade long edge portion includes: the bottom blade outer edge, the transition arc edge and the bottom blade inner edge connected in sequence, and the cutting portion has a bottom blade short edge chip groove distributed on the side of the bottom blade short edge facing the bottom blade long edge, and a bottom blade long edge chip groove distributed on the side of the bottom blade long edge facing the bottom blade short edge.

[0009] Optionally, the acute angle between the outer edge of the bottom blade and the target plane ranges from 3 degrees to 10 degrees; the angle between the inner edge of the bottom blade and the target plane ranges from 0 degrees to 3 degrees; the acute angle between the short edge of the bottom blade and the target plane ranges from 0 degrees to 3 degrees.

[0010] Optionally, the two ends of the transition arc blade are tangent to the second end of the outer edge of the bottom blade and the second end of the inner edge of the bottom blade respectively, and the distance between the vertices of the two transition arc blades is greater than the distance between the second ends of the two short edges of the bottom blade.

[0011] Optionally, the ratio of the distance between the vertices of the two transition arc edges to the diameter of the cutting portion is in the range of 0.35 to 0.55; the ratio of the distance between the second ends of the two short edges of the bottom blades to the diameter of the cutting portion is in the range of 0.3 to 0.5.

[0012] Optionally, an angle α2 between a long edge of the bottom blade and an adjacent short edge of the bottom blade is greater than an angle α1 between a long edge of the bottom blade and another adjacent short edge of the bottom blade.

[0013] Optionally, 2°≤α2-α1≤10°.

[0014] Optionally, the side portion of the cutting portion has: a circumferential long edge connected to the bottom edge long edge, and a circumferential short edge connected to the bottom edge short edge;

[0015] Among them, the cutting part also has: a circumferential long blade chip groove distributed on the side of the circumferential long blade facing the circumferential short blade, and a circumferential short blade chip groove distributed on the side of the circumferential short blade facing the circumferential long blade, the circumferential long blade chip groove is connected with the bottom blade long blade chip groove, and the circumferential short blade chip groove is connected with the bottom blade short blade chip groove.

[0016] Optionally, the groove surface of the circumferential long-edge chip groove and the outer side surface of the clamping portion are connected to form a first partial arc, and the groove surface of the circumferential short-edge chip groove and the outer side surface of the clamping portion are connected to form a second partial arc;

[0017] The groove surface of the bottom blade long-edge chip groove and the groove surface of the circumferential long-edge chip groove are connected to form a third partial arc, and the groove surface of the bottom blade short-edge chip groove and the groove surface of the circumferential short-edge chip groove are connected to form a fourth partial arc.

[0018] Optionally, each of the bottom blade long edge portions has: a bottom blade long edge rake face and a bottom blade long edge first flank face, the bottom blade long edge is formed at the intersection of the bottom blade long edge rake face and the bottom blade long edge first flank face; the side portion of the cutting portion has: a circumferential long edge rake face and a circumferential long edge flank face, the circumferential long edge is formed at the intersection of the circumferential long edge rake face and the circumferential long edge flank face; the edge portion of the cutting portion has a long edge chamfered straight edge connecting the bottom blade long edge and the circumferential long edge;

[0019] And / or, each of the bottom blade short blade portions has: a bottom blade short blade front cutting edge and a bottom blade short blade first back cutting edge, and the bottom blade short blade is formed at the intersection of the bottom blade short blade front cutting edge and the bottom blade short blade first back cutting edge; the side portion of the cutting portion has: a circumferential short blade front cutting edge and a circumferential short blade back cutting edge, and the circumferential short blade is formed at the intersection of the circumferential short blade front cutting edge and the circumferential short blade back cutting edge; the edge portion of the cutting portion has a short blade chamfered straight blade connecting the bottom blade short blade and the circumferential short blade.

[0020] Optionally, the drilling and milling end mill has an internal cooling hole channel distributed in the clamping part and the cutting part, and the part of the internal cooling hole channel distributed in the clamping part has an inlet, and the part of the internal cooling hole channel distributed in the cutting part has an outlet connected to at least one of the bottom blade long edge chip grooves.

[0021] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0022] A drilling and milling end mill may include: a clamping portion, and a cutting portion fixedly connected to one end of the clamping portion. The outer edges of the bottom blades, the transition arc edges and the inner edges of the bottom blades in the two bottom blade long edge portions form a "W"-shaped bottom blade cutting long edge. In the direction of the central axis of the cutting portion, the outer edges of the bottom blades are higher than the inner edges of the bottom blades, and a part of the short edges of the bottom blades is distributed on the side of the outer edges of the bottom blades away from the clamping portion, and the other part of the short edges of the bottom blades is distributed on the side of the transition arc edges and the inner edges of the bottom blades close to the clamping portion. In this way, when drilling, the transition arc edges, the inner edges of the bottom blades and the short edges of the bottom blades mainly play a role, and the outer edges of the bottom blades are basically not involved in cutting, thereby reducing the drilling and cutting resistance. At the same time, since the lengths of the short edges of the bottom blades, the transition arc edges and the inner edges of the bottom blades involved in drilling and milling are relatively short, and the two are respectively distributed at different positions at the bottom of the cutting portion, the chips generated are relatively small, and the chips are conveniently discharged from the chip grooves of the long edges of the bottom blades and the short edges of the bottom blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a drilling and milling end mill provided in an embodiment of the present application;

[0025] Figure 2 yes Figure 1 A front view of a drilling and milling end mill is shown;

[0026] Figure 3 yes Figure 1 A top view of a drilling and milling end mill from one perspective is shown;

[0027] Figure 4 yes Figure 1 A top view of another perspective of the drilling and milling end mill is shown;

[0028] Figure 5 yes Figure 1 A schematic diagram of the distribution of the bottom edge and long edge in the drilling and milling end mill is shown;

[0029] Figure 6 yes Figure 1 A schematic diagram of the distribution of the bottom cutting edge and short cutting edge in the drilling and milling end mill is shown;

[0030] Figure 7 This is a schematic diagram for comparing the combination of a long bottom blade and a short bottom blade provided in an embodiment of the present application;

[0031] Figure 8It is a schematic diagram of the distribution of the bottom blade and long edge of another drilling and milling end mill provided in an embodiment of the present application;

[0032] Fig. 9 It is a schematic diagram of the distribution of the short edges of the bottom edges of another drilling and milling end mill provided in an embodiment of the present application;

[0033] Fig.10 is a front view of another drilling and milling end mill provided in an embodiment of the present application;

[0034] Fig.11 yes Figure 1 A top view of a drilling and milling end mill from one perspective is shown;

[0035] Fig.12 yes Figure 1 A top view of another perspective of the drilling and milling end mill is shown;

[0036] Fig.13 yes Fig.12 Cross-sectional view at AA'.

[0037] Among them, the drilling and milling end mill 000, the clamping part 100, the cutting part 200, the bottom blade long edge part 201, the bottom blade short edge part 202, the bottom blade outer edge R1, the transition arc edge R2, the bottom blade inner edge R3, the target plane M, the arc radius r of the transition arc edge, the bottom blade short edge R4, the circumferential edge Z, the bottom blade short edge chip groove N2, the bottom blade long edge chip groove N1, the vertex d of the transition arc edge, the circumferential long edge Z1, the circumferential short edge Z2, the circumferential long edge chip groove C1, the circumferential short edge chip groove C2, the first Partial arc Y1, second partial arc Y2, third partial arc Y3, fourth partial arc Y4, long-edge chamfered straight edge D1, short-edge chamfered straight edge D2, cutting portion blade diameter Dc, bottom edge long-edge rake face k1, bottom edge long-edge first flank face k2, bottom edge short-edge rake face k3, bottom edge short-edge first flank face k4, circumferential long-edge rake face k5, circumferential long-edge flank face k6, circumferential short-edge rake face k7, circumferential short-edge flank face k8, internal cooling hole channel 300, inlet 301, outlet 302.

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0042] In the related technology, the bottom blade of a four-edge end mill is generally composed of a group of long blades and a group of short blades. When drilling directly, the four blade parts of the bottom blade are involved in cutting at the same time, and the cutting resistance is relatively large during drilling. At the same time, due to the longer blade length of the long blade of the bottom blade, the chips generated are relatively large. The chip removal of the end mill groove is not as good as that of the drill bit, which can easily lead to chip blockage and edge breakage.

[0043] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 1 is a structural schematic diagram of a drilling and milling end mill provided in an embodiment of the present application, Figure 2 yes Figure 1 A front view of a drilling and milling end mill is shown, Figure 3 yes Figure 1 A top view of a drilling and milling end mill from one perspective is shown. Figure 4 yes Figure 1 Another top view of the drilling and milling end mill is shown. Figure 5 yes Figure 1 The schematic diagram of the distribution of the bottom edge and long edge in the drilling and milling end mill is shown. Figure 6 yes Figure 1 The schematic diagram of the distribution of the bottom blade short edge in the drilling and milling end mill 000 is shown. The drilling and milling end mill 000 may include: a clamping part 100, and a cutting part 200 fixedly connected to the clamping part 100, and the bottom of the cutting part 200 may have: a group of bottom blade long edge parts 201 and a group of bottom blade short edge parts 202.

[0044] A set of bottom blade long edge portions 201 may include: two bottom blade long edge portions 201 symmetrically distributed along the central axis L of the cutting portion 200, and the bottom blade long edge portions 201 may have: a bottom blade outer edge R1, a transition arc edge R2, and a bottom blade inner edge R3 connected in sequence. The first end P1 of the bottom blade outer edge R1 may be used to connect with the circumferential edge Z of the cutting portion 200, and the two ends of the transition arc edge R2 may be connected with the second end P2 of the bottom blade outer edge R1 and the second end Q2 of the bottom blade inner edge R3, respectively. The first end Q1 of the bottom blade inner edge R3 is distributed in the central area of ​​the bottom of the cutting portion 200, and the second end P2 of the bottom blade outer edge R1 is away from the clamping portion 100 relative to the first end P1 of the bottom blade outer edge R1. The second end Q2 of the inner edge R3 of the bottom blade is away from the clamping portion 100 relative to the first end Q1 of the inner edge R3 of the bottom blade, and the acute angle θ1 formed between the outer edge R1 of the bottom blade and the target plane M can be greater than the angle θ2 between the inner edge R3 of the bottom blade and the target plane M, so that the outer edge R1 of the bottom blade is higher than the inner edge R3 of the bottom blade in the direction of the central axis L of the cutting portion 200. Here, the target plane M can be a plane perpendicular to the central axis L of the cutting portion 200, and the angle formed between the outer edge R1 of the bottom blade in the long edge portion 201 of the bottom blade and the target plane M and the angle formed between the inner edge R3 of the bottom blade in the long edge portion 201 of the bottom blade and the target plane M are respectively: the smaller angle of the angle formed between the outer edge R1 of the bottom blade and the target plane M and the angle formed between the inner edge R3 of the bottom blade and the target plane M.

[0045] It should be noted that the transition arc blade R2 is convex in the direction away from the clamping portion 100, and the arc radius r of the transition arc blade R2 can be in the range of 0.2 mm to 1 mm. For example, the arc radius r of the transition arc blade R2 can be 0.2 mm, 0.5 mm or 1 mm. The smaller the arc radius r of the transition arc blade R2, the shorter the arc length of the lowest point of the long edge of the bottom blade during drilling, and the easier it is to wear and break. The larger the arc radius r of the transition arc blade R2, the longer the arc length of the lowest point of the long edge of the bottom blade during bottom blade drilling, and the smoother the cutting process.

[0046] A group of bottom blade short edge portions 202 may include: two bottom blade short edge portions 202 distributed on both sides of the two bottom blade long edge portions 201, each bottom blade short edge portion 202 may have a bottom blade short edge R4, a first end T1 of the bottom blade short edge R4 may be used to connect with the circumferential edge Z of the cutting portion 200, and the first end T1 of the bottom blade short edge R4 is away from the clamping portion 100 relative to the second end T2 of the bottom blade short edge R4. Figure 7 , Figure 7A schematic diagram for comparing the combination of a long bottom blade and a short bottom blade is provided. In the direction of the central axis L of the cutting portion 200, the first end T1 of the short bottom blade R4 can be away from the clamping portion 100 relative to the first end P1 of the outer bottom blade R1, and the second end T2 of the short bottom blade R4 can be close to the clamping portion 100 relative to the arc vertex of the transition arc blade R2. That is, a part of the short bottom blade R4 can be distributed on the side of the outer bottom blade R1 away from the clamping portion 100, and another part of the short bottom blade R4 can be distributed on the side of the transition arc blade R2 and the inner bottom blade R3 close to the clamping portion 100.

[0047] The bottom blade long edge 201a of the bottom blade long edge portion 201 includes: a bottom blade outer edge R1, a transition arc edge R2 and a bottom blade inner edge R3 connected in sequence. The cutting portion 200 may have a bottom blade short edge chip groove N2 distributed on the side of the bottom blade short edge R4 facing the bottom blade long edge, and a bottom blade long edge chip groove N1 distributed on the side of the bottom blade long edge facing the bottom blade short edge R4. It should be noted that the length of the bottom blade short edge R4 in the cutting portion 200 is less than the length of the bottom blade long edge.

[0048] In the embodiment of the present application, the bottom blade outer edge R1, transition arc edge R2 and bottom blade inner edge R3 in the two bottom blade long edge portions 201 form a "W"-shaped bottom blade cutting long edge, the bottom blade outer edge R1 is higher than the bottom blade inner edge R3 in the direction of the central axis L of the cutting portion 200, and a part of the bottom blade short edge R4 is distributed on the side of the bottom blade outer edge R1 away from the clamping portion 100, and another part of the bottom blade short edge R4 is distributed on the side of the transition arc edge R2 and the bottom blade inner edge R3 close to the clamping portion 100. In this way, when drilling, the transition arc edge R2, the bottom blade inner edge R3 and the bottom blade short edge R4 are mainly used, and the bottom blade outer edge R1 is basically not involved in the cutting, which reduces the drilling and cutting resistance of the drilling and milling end mill 000. At the same time, since the short edge R4 of the bottom blade, the transition arc edge R2 and the inner edge R3 of the bottom blade involved in drilling and milling are relatively short, and the two are respectively distributed at different positions at the bottom of the cutting part 200, the chips generated are smaller, and the chips are conveniently discharged from the long edge chip groove N1 of the bottom blade and the short edge chip groove N2 of the bottom blade. In this way, the drilling and milling end mill 000 can simultaneously take into account the functions of good drilling and milling.

[0049] In the present application, the angle range of the acute angle θ1 between the outer edge R1 of the bottom blade in the long edge portion 201 of the bottom blade and the target plane M can be: 3 degrees to 10 degrees. For example, the angle of θ1 can be 3 degrees, 6 degrees or 10 degrees, etc. The angle range of the angle θ2 between the inner edge R3 of the bottom blade in the long edge portion 201 of the bottom blade and the target plane M can be: 0 degrees to 3 degrees. For example, the angle of θ2 can be 0 degrees, 2 degrees or 3 degrees, etc. The angle range of the acute angle θ3 between the short edge R4 of the bottom blade in the short edge portion 202 of the bottom blade and the target plane M can be: greater than 0 degrees and less than or equal to 3 degrees. It should be noted that the smaller θ1 is, the more obvious the participation of the outer edge R1 of the bottom blade in cutting during drilling, but the larger θ1 is, the wear near the end during side milling falls on the short edge R4 of the bottom blade, and the wear is faster. The smaller the angle θ3 is, the longer the contact length of the short edge R4 of the bottom blade is during drilling and milling, and the greater the cutting resistance. The larger the angle θ3 is, the smaller the contact length of the short edge R4 of the bottom blade is during drilling and milling, and the smaller the cutting resistance, but the tip of the short edge R4 of the bottom blade is prone to chipping.

[0050] Optional, please refer to Figure 5 , Figure 6 , Figure 8 and Fig. 9 , Figure 8 Schematic diagram of the distribution of the bottom blade and long edge of another drilling and milling end mill provided in an embodiment of the present application. Fig. 9 It is a schematic diagram of the distribution of the short edges of the bottom blade of another drilling and milling end mill provided in an embodiment of the present application. The two ends of the transition arc edge R2 in the long edge portion 201 of the bottom blade can be tangent to the second end P2 of the outer edge R1 of the bottom blade and the second end Q2 of the inner edge R3 of the bottom blade, respectively, and the distance Φ1 between the arc vertices d of the two transition arc edges R2 in the two long edge portions 201 of the bottom blade can be greater than the distance Φ2 between the second ends T2 of the two short edges R4 of the bottom blade. Here, the arc vertex d of the transition arc edge R2 is the lowest point of the long edge of the bottom blade in the direction of the central axis L of the cutting portion 200, and the second end T2 of the short edge R4 of the bottom blade is the highest point of the short edge R4 of the bottom blade in the direction of the central axis L of the cutting portion 200.

[0051] For example, the ratio of the distance Φ1 between the arc vertices d of the two transition arc edges R2 to the edge diameter Dc of the cutting portion 200 may be in the range of 0.35 to 0.55, and the ratio of the distance Φ2 between the second ends T2 of the two bottom edge short edges R4 to the edge diameter Dc of the cutting portion 200 may be in the range of 0.3 to 0.5. For example, the ratio of the distance Φ1 between the arc vertices d of the two transition arc edges R2 to the edge diameter Dc of the cutting portion 200 may be 0.35, 0.4 or 0.55, and the ratio of the distance Φ2 between the second ends T2 of the two bottom edge short edges R4 to the edge diameter Dc of the cutting portion 200 may be 0.3, 0.4 or 0.5, etc. It should be noted that the larger Φ2 is, the shorter the edge length of the bottom edge short edge R4 is, the worse the structural strength of the bottom edge is, and the smaller Φ2 is, the smaller the chip groove N1 of the bottom edge long edge is, which is not conducive to chip rolling and chip removal.

[0052] In the examples of this application, please refer to Fig.10 , Fig.10 It is a front view of another drilling and milling end mill provided in an embodiment of the present application. The angle α2 between a bottom blade long edge and a bottom blade short edge R4 adjacent to the bottom blade long edge can be greater than the angle α1 between a bottom blade long edge and another bottom blade short edge R4 adjacent to the bottom blade long edge. In this case, by setting the angle α2 between a bottom blade long edge and a bottom blade short edge R4 adjacent to the bottom blade long edge to be greater than the angle α1 between a bottom blade long edge and another bottom blade short edge R4 adjacent to the bottom blade long edge, that is, the bottom blade long edge and the bottom blade short edge R4 are distributed at unequal intervals. In this way, the side milling shock absorbing effect of the drilling and milling end mill 000 can be effectively achieved. It should be noted that the drilling and milling end mill 000 completes side milling through the circumferential blade Z, which will be explained in subsequent embodiments.

[0053] For example, 2 degrees ≤ α2-α1 ≤ 10 degrees. If the difference between the angles α2-α1 is too small, the damping effect is not obvious. If the difference between the angles α2-α1 is too large, it will affect the spatial distribution of the chip grooves between adjacent bottom edges, resulting in too small chip grooves N2 of the short edges of the bottom edges, affecting chip holding and chip removal. For example, the value of α2-α1 can be 2 degrees, 5 degrees, 8 degrees or 10 degrees, etc.

[0054] Optional, please refer to Fig.10 , Fig.11 , Fig.12 and Fig.13 , Fig.11 is a top view showing a drilling and milling end mill from one perspective, Fig.12 This is a top view of the drilling and milling end mill from another angle. Fig.13 yes Fig.12Cross-sectional view at A-A'. The side of the cutting part 200 may have: a circumferential long edge Z1 connected to the bottom edge long edge, and a circumferential short edge Z2 connected to the bottom edge short edge R4. Among them, the cutting part 200 also has: a circumferential long edge chip groove C1 distributed on the side of the circumferential edge long Z1 toward the circumferential short edge Z2, and a circumferential short edge chip groove C2 distributed on the side of the circumferential short edge Z2 toward the circumferential long edge Z1. The circumferential long edge chip groove C1 can be connected to the bottom edge long edge chip groove N1, and the circumferential short edge chip groove C2 can be connected to the bottom edge short edge chip groove N2. In this way, the drilling and milling end mill 000 can realize side milling of the workpiece cavity through the circumferential long edge Z1 and the circumferential short edge Z2. And the circumferential edge and the bottom edge are both equipped with chip grooves to ensure convenient chip removal during drilling and sufficient chip space during expansion milling.

[0055] For example, Fig.11 and Fig.12 As shown, the angle range of the helix angle β1 of the circumferential long edge Z1 can be: 20 degrees to 40 degrees, and the angle range of the helix angle β2 of the circumferential short edge Z2 can be: 20 degrees to 40 degrees. For example, the angle of the helix angle β1 of the circumferential long edge Z1 can be: 20 degrees, 30 degrees or 40 degrees, etc., and the angle of the helix angle β2 of the circumferential short edge Z2 can be: 20 degrees, 30 degrees or 40 degrees, etc. It should be noted that the larger the helix angle of the circumferential edge, the longer the effective cutting edge, and the more conducive to side milling, but the larger the helix angle, the worse the chip removal effect; the smaller the helix angle of the circumferential edge, the more convenient it is to remove chips upward, but the effective cutting edge is relatively short, which is not conducive to side milling.

[0056] In the embodiments of the present application, Fig.11 and Fig.12 As shown, the connection between the groove surface of the circumferential long-edge chip groove C1 and the outer side surface of the clamping part 100 can be a first partial arc Y1, and the connection between the groove surface of the circumferential short-edge chip groove C2 and the outer side surface of the clamping part 100 can be a second partial arc Y2. The connection between the groove surface of the bottom-edge long-edge chip groove N1 and the groove surface of the circumferential long-edge chip groove C1 can be a third partial arc Y3, and the connection between the groove surface of the bottom-edge short-edge chip groove N2 and the groove surface of the circumferential short-edge chip groove C2 can be a fourth partial arc Y4. In this way, it can be further ensured that the chips can be discharged from each chip groove in a timely manner, ensuring that there is enough chip space during expansion milling.

[0057] Optional, such as Fig.10 , Fig.11 and Fig.12As shown, the edge of the cutting portion 200 may have a long chamfered straight edge D1 connecting the bottom edge long edge and the circumferential long edge Z1, and a short chamfered straight edge D2 connecting the bottom edge short edge R4 and the circumferential short edge Z2. In this way, by providing the long chamfered straight edge D1 and the short chamfered straight edge D2, the drilling and milling end milling tool 000 can be effectively protected from easily chipping the cutting edge during drilling and side milling. For example, the chamfer width of the long chamfered straight edge D1 may be 0.5%-2% of the cutting portion blade diameter Dc, and the chamfer width of the short chamfered straight edge D2 may be 0.5%-2% of the cutting portion blade diameter Dc.

[0058] In the embodiments of the present application, Fig.10 , Fig.11 and Fig.12 As shown, each bottom blade long edge portion 201 may have: a bottom blade long edge rake face k1 and a bottom blade long edge first flank face k2, and the intersection of the bottom blade long edge rake face k1 and the bottom blade long edge first flank face k2 may form a bottom blade long edge. Each bottom blade short edge portion 202 may have: a bottom blade short edge rake face k3 and a bottom blade short edge first flank face k4, and the intersection of the bottom blade short edge rake face k3 and the bottom blade short edge first flank face k4 may form a bottom blade short edge R4. The side portion of the cutting portion 200 has: a circumferential long edge rake face k5 and a circumferential long edge flank face k6, and the intersection of the circumferential long edge rake face k5 and the circumferential long edge flank face k6 may form a circumferential long edge Z1. The side of the cutting portion 200 may further include: a circumferential short-edge rake face k7 and a circumferential short-edge flank face k8, and the intersection of the circumferential short-edge rake face k7 and the circumferential short-edge flank face k8 may form the circumferential short edge Z2.

[0059] For example, Fig.10 , Fig.11 and Fig.12 As shown, each bottom blade long edge portion 201 may also have: a bottom blade long edge second back blade surface S1 distributed on the side of the bottom blade long edge first back blade surface k2 away from the bottom blade long edge 201a, and each bottom blade long edge portion 201 may also have: a bottom blade short edge second back blade surface S2 distributed on the side of the bottom blade short edge first back blade surface k4 away from the bottom blade short edge R4.

[0060] When the cutting portion has a long-edge chamfered straight edge D1 connecting the bottom edge long edge and the circumferential long edge Z1, and a short-edge chamfered straight edge D2 connecting the bottom edge short edge R4 and the circumferential short edge Z2, the cutting portion is provided with a bottom edge long-edge chamfered edge back cutting edge L1 and a bottom edge short-edge chamfered edge back cutting edge L2, and the long-edge chamfered straight edge D1 is formed at the intersection of the bottom edge long-edge chamfered edge back cutting edge L1 and the bottom edge long-edge front cutting edge k1, and the short-edge chamfered straight edge D2 is formed at the intersection of the bottom edge short-edge chamfered edge back cutting edge L2 and the bottom edge short-edge front cutting edge k3.

[0061] Optional, such as Fig.10 , Fig.11 and Fig.12As shown, the drilling and milling end mill 000 may have an inner cooling hole channel 300 distributed in the clamping part 100 and the cutting part 200, and the portion of the inner cooling hole channel 300 distributed in the clamping part 100 has an inlet 301, and the portion of the inner cooling hole channel 300 distributed in the cutting part 200 has an outlet 302 connected to at least one bottom edge long edge chip groove N1. In this way, the coolant introduced by the inner cooling hole channel 300 can have a certain pressure, which can ensure that the chips in the chip groove can be discharged smoothly, and a good cooling effect can be achieved during drilling and milling.

[0062] For example, the inlet 301 of the inner coolant hole channel 300 may be located at one end of the clamping portion 100 away from the cutting portion 200, and the portion of the inner coolant hole channel 300 distributed in the cutting portion 200 has two outlets 302 correspondingly connected to the two bottom edge long edge chip grooves N1.

[0063] In summary, the embodiment of the present application provides a drilling and milling end mill, which may include: a clamping portion, and a cutting portion fixedly connected to one end of the clamping portion. The outer edge of the bottom blade, the transition arc edge and the inner edge of the bottom blade in the two bottom blade long edge portions form a "W"-shaped bottom blade cutting long edge, the outer edge of the bottom blade is higher than the inner edge of the bottom blade in the direction of the central axis of the cutting portion, and a part of the short edge of the bottom blade is distributed on the side of the outer edge of the bottom blade away from the clamping portion, and the other part of the short edge of the bottom blade is distributed on the side of the transition arc edge and the inner edge of the bottom blade close to the clamping portion. In this way, when drilling, the transition arc edge, the inner edge of the bottom blade and the short edge of the bottom blade mainly play a role, and the outer edge of the bottom blade basically does not participate in cutting, thereby reducing the drilling and cutting resistance. At the same time, since the lengths of the short edge of the bottom blade, the transition arc edge and the inner edge of the bottom blade involved in drilling and milling are relatively short, and the two are respectively distributed at different positions at the bottom of the cutting portion, the chips generated are relatively small, which facilitates the discharge of chips from the chip groove of the long edge of the bottom blade and the chip groove of the short edge of the bottom blade.

[0064] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0065] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A drilling and milling end mill, characterized in that: include: A clamping portion, and a cutting portion fixedly connected to one end of the clamping portion, wherein the bottom of the cutting portion has: a group of bottom blade long edge portions and a group of bottom blade short edge portions; A group of bottom blade long blade portions comprises: two bottom blade long blade portions symmetrically distributed along the central axis of the cutting portion, the bottom blade long blade portions having: a bottom blade outer blade, a transition arc blade and a bottom blade inner blade connected in sequence, the first end of the bottom blade outer blade being used to connect with the circumferential blade of the cutting portion, the two ends of the transition arc blade being respectively connected with the second end of the bottom blade outer blade and the second end of the bottom blade inner blade, the first end of the bottom blade inner blade being distributed in the central area of ​​the cutting portion, the second end of the bottom blade outer blade being away from the clamping portion relative to the first end of the bottom blade outer blade, and the second end of the bottom blade inner blade being away from the clamping portion relative to the first end of the bottom blade inner blade; and the acute angle formed between the bottom blade outer blade and the target plane is greater than the angle between the bottom blade inner blade and the target plane, the target plane being a plane perpendicular to the central axis of the cutting portion; A group of bottom blade short blade portions comprises: two bottom blade short blade portions distributed on both sides of the two bottom blade long blade portions, the bottom blade short blade portions having bottom blade short blades, the first ends of the bottom blade short blades being used to connect with the circumferential blade of the cutting portion, the first ends of the bottom blade short blades being away from the clamping portion relative to the second ends of the bottom blade short blades, and in the direction along the central axis of the cutting portion, the first ends of the bottom blade short blades are away from the clamping portion relative to the first ends of the bottom blade outer blades, and the second ends of the bottom blade short blades are close to the clamping portion relative to the arc vertex of the transition arc blade; Among them, the bottom blade long edge of the bottom blade long edge portion includes: the bottom blade outer edge, the transition arc edge and the bottom blade inner edge connected in sequence; the cutting portion has a bottom blade short edge chip groove distributed on the side of the bottom blade short edge facing the bottom blade long edge, and a bottom blade long edge chip groove distributed on the side of the bottom blade long edge facing the bottom blade short edge.

2. The drilling and milling end mill according to claim 1, characterized in that: The acute angle between the outer edge of the bottom blade and the target plane ranges from 3 degrees to 10 degrees; the angle between the inner edge of the bottom blade and the target plane ranges from 0 degrees to 3 degrees; the acute angle between the short edge of the bottom blade and the target plane ranges from 0 degrees to 3 degrees.

3. The drilling and milling end mill according to claim 1, characterized in that: The two ends of the transition circular arc blade are tangent to the second end of the outer edge of the bottom blade and the second end of the inner edge of the bottom blade respectively, and the distance between the vertices of the two transition circular arc blades is greater than the distance between the second ends of the two short edges of the bottom blade.

4. The drilling and milling end mill according to claim 3, characterized in that: The ratio of the distance between the vertices of the two transition arc edges to the edge diameter of the cutting portion is in the range of 0.35 to 0.55; the ratio of the distance between the second ends of the two bottom edge short edges to the edge diameter of the cutting portion is in the range of 0.3 to 0.

5.

5. The drilling and milling end mill according to any one of claims 1 to 4, characterized in that: An included angle α2 between one of the long edges of the bottom blade and an adjacent short edge of the bottom blade is greater than an included angle α1 between one of the long edges of the bottom blade and another adjacent short edge of the bottom blade.

6. The drilling and milling end mill according to claim 5, characterized in that: 2°≤α2-α1≤10°。 7. The drilling and milling end mill according to claim 5, characterized in that: The side portion of the cutting portion has: a circumferential long edge connected to the bottom blade long edge, and a circumferential short edge connected to the bottom blade short edge; Among them, the cutting part also has: a circumferential long blade chip groove distributed on the side of the circumferential long blade facing the circumferential short blade, and a circumferential short blade chip groove distributed on the side of the circumferential short blade facing the circumferential long blade, the circumferential long blade chip groove is connected with the bottom blade long blade chip groove, and the circumferential short blade chip groove is connected with the bottom blade short blade chip groove.

8. The drilling and milling end mill according to claim 7, characterized in that: The groove surface of the circumferential long-edge chip groove and the outer side surface of the clamping portion are connected to form a first partial arc, and the groove surface of the circumferential short-edge chip groove and the outer side surface of the clamping portion are connected to form a second partial arc; The groove surface of the bottom blade long-edge chip groove and the groove surface of the circumferential long-edge chip groove are connected to form a third partial arc, and the groove surface of the bottom blade short-edge chip groove and the groove surface of the circumferential short-edge chip groove are connected to form a fourth partial arc.

9. The drilling and milling end mill according to claim 7, characterized in that: Each of the bottom blade long edge portions comprises: a bottom blade long edge rake face and a bottom blade long edge first flank face, wherein the bottom blade long edge rake face and the bottom blade long edge first flank face intersect to form the bottom blade long edge; the side portion of the cutting portion comprises: a circumferential long edge rake face and a circumferential long edge flank face, wherein the circumferential long edge is formed at the intersection of the circumferential long edge rake face and the circumferential long edge flank face; The edge of the cutting portion has a long chamfered straight edge connecting the bottom edge long edge and the circumferential long edge; And / or, each of the bottom blade short blade portions has: a bottom blade short blade front cutting edge and a bottom blade short blade first back cutting edge, and the bottom blade short blade is formed at the intersection of the bottom blade short blade front cutting edge and the bottom blade short blade first back cutting edge; the side portion of the cutting portion has: a circumferential short blade front cutting edge and a circumferential short blade back cutting edge, and the circumferential short blade is formed at the intersection of the circumferential short blade front cutting edge and the circumferential short blade back cutting edge; the edge portion of the cutting portion has a short blade chamfered straight blade connecting the bottom blade short blade and the circumferential short blade.

10. The drilling and milling end mill according to any one of claims 1-4, 6-9, characterized in that: The drilling and milling end mill has an internal cooling hole channel distributed in the clamping part and the cutting part, and the part of the internal cooling hole channel distributed in the clamping part has an inlet, and the part of the internal cooling hole channel distributed in the cutting part has an outlet connected to at least one of the bottom blade long edge chip grooves.

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