Wide-angle layered ball-end milling cutter

Abstract

The utility model relates to the technical field of milling cutters, and discloses a wide-angle layered ball-end milling cutter which comprises a cutter body and a cutter handle, the top end of the cutter body is spherical, the longitudinal axial section of the cutter body is of a fan-shaped structure with the angle larger than 180 degrees, two blades are arranged at the top end of the cutter body, and the blades spirally extend towards the cutter handle along the side wall of the cutter body. Chip grooves are formed in the top end of the cutter body along the edges of the two cutting edges, the two cutting edges are mutually staggered at the top of the cutter body, and the two cutting edges extend into the two chip grooves, so that the two cutting edges form a staggered conical point A and two staggered cutting edge angles f; the two cutting edges are staggered at the top end of the cutter body to form the staggered conical point A, so that the end of the ball-end milling cutter can apply high-strength pressure to the surface of a workpiece, the surface of the workpiece can be broken conveniently, the milling capacity of the end of the end is improved, and when the end of the ball-end milling cutter is in contact with the workpiece, the end of the ball-end milling cutter is not prone to breakage due to the staggered cutting edge angle f formed after the two cutting edges are staggered. And the cutting edge still has a relatively strong cutting effect.

Description

Technical Field

[0001] The utility model relates to the technical field of milling cutters, and more specifically to a wide-angle layered ball-end milling cutter. Background Art

[0002] A milling cutter is a rotary tool with one or more teeth used for milling. There are many types of milling cutters, including ball-end milling cutters. Ball-end milling cutters are widely used in milling. Their blades are shaped like a ball head, hence the name. Ball-end milling cutters are tools with blades similar to ball heads that are installed on milling machines for milling various curved surfaces and circular grooves. The Chinese patent (CN218396104U) discloses "a wide-angle layered ball-end milling cutter". This application improves the processing efficiency and processing accuracy of the workpiece. The segment angle of the blade on the cutter carrier is greater than 180°, which allows the milling cutter to have a larger cutting range and realize a wide-angle cutting method. The blades are layered on the spherical surface of the cutter carrier, which effectively disperses the cutting force and ensures the stability of the cutting process.

[0003] The ball-end milling cutter in the prior art has defects when in use: first, the chip removal ability of the tool is weak during processing, and debris accumulates at the blade after long-term work, affecting the milling accuracy; second, the milling ability of the tool head is weak. When in contact with the workpiece, the blade head is extremely susceptible to strong wear, affecting the service life. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a wide-angle layered ball head milling cutter to solve the problem that the wide-angle layered ball head milling cutter in the prior art in the above-mentioned background technology has weak chip removal ability affecting the milling accuracy, and the milling ability at the cutter head is weak and easily subject to wear, thereby reducing the service life.

[0005] The utility model provides the following technical solutions: a wide-angle layered ball-end milling cutter, comprising a cutter body and a cutter handle, wherein the top of the cutter body is set to be spherical, and the axial section in the longitudinal direction is a fan-shaped structure with an angle greater than 180°, the top of the cutter body is provided with two blades, the blades are spirally extended along the side wall of the cutter body toward the cutter handle, and the top of the cutter body is provided with chip grooves along the edges of the two blades, the two blades are staggered at the top of the cutter body, and the two blades extend into the two chip grooves, so that the two blades form a staggered cone point A and two staggered blade angles f, and the staggered cone point A is the highest point of the top of the cutter body;

[0006] The blade is composed of an inner peripheral blade, an outer peripheral blade, and an end blade, and the inner peripheral blade is an inner concave curved surface;

[0007] The side wall of the blade is provided with a plurality of air flow holes along a spiral direction, and the air flow holes connect the inner peripheral blade and the end blade.

[0008] Furthermore, the staggered blade angle f of the two blades is 10° to 15°.

[0009] Furthermore, the helical angle e of the blade on the blade body is 40° to 45°.

[0010] Furthermore, the radial first clearance angle a of the peripheral cutting edge is in the range of 14° to 18°, and the radial second clearance angle b of the peripheral cutting edge is in the range of 26° to 30°.

[0011] Furthermore, the radial rake angle d of the inner peripheral cutting edge ranges from 5° to 15°.

[0012] Furthermore, the edge angle c of the end edge is 35°.

[0013] Furthermore, the surfaces of the blade body and the blade are provided with a protective coating, and the protective coating is composed of at least one layer of high-strength, high-hardness wear-resistant material, including but not limited to ceramic material, cemented carbide particles, and diamond material.

[0014] Furthermore, the protective coating is uniformly deposited on the surface of the blade body and the blade by one of the following process methods: physical vapor deposition, chemical vapor deposition, thermal spraying, and electroplating, and the surface of the protective coating is micro-textured and nano-processed.

[0015] Technical effects and advantages of the utility model:

[0016] The utility model forms a staggered cone point A through the staggered design of two blades at the top of the cutter body, so that the end of the milling cutter can apply high-intensity pressure to the surface of the workpiece, which is convenient for breaking the surface of the workpiece and improving the milling ability at the end. In addition, the staggered blade angle f is formed after the two blades are staggered, so that when the end of the ball-end milling cutter contacts the workpiece, the blade still has a strong cutting effect, further improving the milling ability of the end of the ball-end milling cutter;

[0017] The spiral arrangement of the two blades and the two chip removal grooves on the cutter body can improve the chip removal capacity of the ball end milling cutter and enable it to have side milling capacity. In addition, the two blades are staggered and extend into the two chip removal grooves respectively, so that when the end of the ball end milling cutter is milling, it is convenient to guide the milling chips into the two chip removal grooves to assist in chip removal. In addition, the concave curved surface shape of the inner peripheral edge of the blade is set to increase the chip capacity of the chip removal groove, thereby further improving the chip removal capacity.

[0018] In addition, by providing a protective coating on the cutter body and the cutting edge, the strength, hardness and wear resistance of the ball end milling cutter are improved, thereby increasing the service life of the milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is the top view of the overall structure of the utility model;

[0021] Figure 3 For this utility model Figure 1 Top view of the cutter body section in ;

[0022] Figure 4 It is a front view of the overall structure of the utility model;

[0023] Figure 5 For this utility model Figure 3 Schematic diagram of the blade structure.

[0024] The reference numerals in the drawings are: 1, tool body; 2, tool handle; 3, blade; 4, chip groove; 5, air flow hole; 31, inner peripheral blade; 32, outer peripheral blade; 33, end blade. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0026] Reference Figure 1-Figure 4 The utility model provides a wide-angle layered ball-end milling cutter, comprising a cutter body 1 and a cutter handle 2. The top of the cutter body 1 is set to be spherical, and the axial section in the longitudinal direction is a fan-shaped structure with an angle greater than 180°. Two blades 3 are arranged at the top of the cutter body 1. The blades 3 extend in a spiral shape along the side wall of the cutter body 1 toward the cutter handle 2, and chip grooves 4 are opened along the edges of the two blades 3 at the top of the cutter body 1. The two blades 3 are staggered with each other at the top of the cutter body 1, and the two blades 3 extend into the two chip grooves 4, so that the two blades 3 form a staggered cone point A and two staggered blade angles f. The staggered cone point A is the highest point at the top of the cutter body 1. The blade 3 is composed of an inner peripheral blade 31, an outer peripheral blade 32, and an end blade 33. The inner peripheral blade 31 is an inner concave curved surface. The side wall of the blade 3 is opened with a plurality of air flow holes 5 along the spiral direction, and the air flow holes 5 connect the inner peripheral blade 31 and the end blade 33.

[0027] During milling operation, the top of the cutter body 1 contacts the workpiece. In this process, the two blades 3 are first contacted through the staggered cone point A formed by the staggered contact of the workpiece, thereby applying high-intensity pressure to the surface of the workpiece to facilitate breaking the surface of the workpiece. Then, the end edges 33 of the two blades 3 contact the workpiece for cutting. Since there is a staggered blade angle f between the two blades 3, when the end of the milling cutter is milling, the blade 3 can still have a sufficient cutting depth on the workpiece, thereby making the end of the ball head milling cutter have a strong milling ability, and the milling generated by one blade 3 during milling can be guided into the chip groove 4 by the staggered end of the other blade 3, thereby assisting chip removal and improving the chip removal ability of the head of the milling cutter. In addition, by arranging a plurality of air flow holes 5 on the blade 3, when the ball head milling cutter is rotating at high speed, the air flow can pass through the plurality of air flow holes 5, thereby having a heat dissipation effect on the blade 3 and improving the heat resistance of the ball head milling cutter.

[0028] Reference Figure 4 The staggered blade angle f of the two blades 3 is 10° to 15°, which avoids mutual blocking of the two blades 3, so that when the ball end milling cutter head is milling a workpiece, the blade 3 still has sufficient milling depth, further improving the milling ability of the milling cutter head.

[0029] Reference Figure 2 The helical angle e of the blade 3 on the cutter body 1 is 40° to 45°. Using a blade 3 with a larger helical angle helps the milling cutter improve its side milling capability.

[0030] Reference Figure 5 The radial first clearance angle a of the peripheral cutting edge 32 has an angle range of 14° to 18°, and the radial second clearance angle b of the peripheral cutting edge 32 has an angle range of 26° to 30°. Through the smaller angle range of the radial first clearance angle a, the cutting edge 3 can reduce cutting resistance and friction, improve cutting efficiency and tool durability, and the radial second clearance angle b located after the first clearance angle can be used to ensure the gap between the workpiece and the tool during cutting, improve cutting stability, and assist chip removal, thereby further improving the chip removal ability of the milling cutter.

[0031] Reference Figure 5 The radial rake angle d of the inner peripheral edge 31 ranges from 5° to 15°, so that the blade 3 has a larger cutting force during the cutting process, increases the cutting temperature, and is easier to process hard materials.

[0032] Reference Figure 5 The edge angle c of the end edge 33 is 35°, which makes the milling tool have a certain milling accuracy while ensuring the overall strength of the blade 3.

[0033] Reference Figure 1The surfaces of the cutter body 1 and the blade 3 are provided with a protective coating, which is composed of at least one layer of high-strength, high-hardness wear-resistant material, including but not limited to ceramic material, cemented carbide particles, and diamond material, thereby improving the strength, hardness and wear resistance of the milling cutter and extending the service life of the milling cutter.

[0034] Reference Figure 1 The protective coating is uniformly deposited on the surface of the blade body 1 and the blade 3 by one of the process methods of physical vapor deposition, chemical vapor deposition, thermal spraying, and electroplating, and the surface of the protective coating is micro-textured and nano-processed to ensure that the protective coating has good bonding force and anti-stripping performance with the blade body 1 and the blade 3, and further improve the wear resistance, anti-adhesion and self-lubricating performance of the coating to meet the needs of different processing materials and processing conditions.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. The utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A wide-angle layered ball-end milling cutter, comprising a cutter body (1) and a cutter handle (2), wherein the top end of the cutter body (1) is configured to be spherical, and the longitudinal axial cross section is a fan-shaped structure with an angle greater than 180°, characterized in that: The top of the knife body (1) is provided with two blades (3), the blades (3) extending in a spiral shape along the side wall of the knife body (1) in the direction of the knife handle (2), and the top of the knife body (1) is provided with chip grooves (4) along the edges of the two blades (3), the two blades (3) are staggered with each other at the top of the knife body (1), and the two blades (3) extend into the two chip grooves (4), so that the two blades (3) form a staggered cone point A and two staggered edge angles f, and the staggered cone point A is the highest point of the top of the knife body (1); The blade (3) is composed of an inner peripheral blade (31), an outer peripheral blade (32), and an end blade (33); the inner peripheral blade (31) is an inner concave curved surface; A plurality of air flow holes (5) are provided on the side wall of the blade (3) in a spiral direction, and the air flow holes (5) connect the inner peripheral blade (31) and the end blade (33).

2. A wide-angle layered ball end milling cutter according to claim 1, characterized in that: The staggered edge angle f of the two blades (3) is 10° to 15°.

3. The wide-angle layered ball end milling cutter according to claim 1, characterized in that: The helical angle e of the blade (3) on the blade body (1) is 40° to 45°.

4. The wide-angle layered ball end milling cutter according to claim 1, characterized in that: The radial first back angle a of the peripheral cutting edge (32) is in the range of 14° to 18°, and the radial second back angle b of the peripheral cutting edge (32) is in the range of 26° to 30°.

5. The wide-angle layered ball end milling cutter according to claim 1, characterized in that: The radial rake angle d of the inner peripheral cutting edge (31) ranges from 5° to 15°.

6. The wide-angle layered ball end milling cutter according to claim 1, characterized in that: The edge angle c of the end edge (33) is 35°.

7. The wide-angle layered ball end milling cutter according to claim 1, characterized in that: The surfaces of the blade body (1) and the blade (3) are both provided with a protective coating, wherein the protective coating is composed of at least one layer of high-strength, high-hardness wear-resistant material, including but not limited to ceramic material, cemented carbide particles, and diamond material.

8. The wide-angle layered ball end milling cutter according to claim 7, characterized in that: The protective coating is uniformly deposited on the surface of the blade body (1) and the blade (3) by using one of physical vapor deposition, chemical vapor deposition, thermal spraying and electroplating, and the surface of the protective coating is micro-textured and nano-processed.

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