A machine clamp type ball head milling cutter

Abstract

The utility model relates to a machine-clamped ball-end milling cutter, belonging to the technical field of mechanical processing tools. The utility model includes a cutter body and a chip groove. A milling blade is provided at the front end of the cutter body, and the milling blade has a front cutting edge. The chip groove is provided on the outer wall of the cutter body and is located beside the milling blade. The front cutting edge is inclined away from the chip groove from the inside to the outside in the radial direction of the cutter body, so that the milling blade forms a negative radial rake angle. At the same time, the front cutting edge is inclined away from the chip groove from the back to the front, so that the milling blade forms a negative axial rake angle. The front end of the milling blade protrudes from the front end face of the cutter body, and a chip space is formed between the front end of the milling blade and the front end face of the cutter body, and the chip groove is connected to the chip space. The utility model makes the blade more resistant to chipping and has a better cutting effect through a negative radial rake angle and a negative axial rake angle. At the same time, two cutting edges are provided on the milling blade, so there is no need to frequently replace the milling blade, and the use cost of the tool is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing tools, in particular to a machine-clamped ball-end milling cutter. Background Art

[0002] The ball cage type constant velocity universal joint is one of the essential key components of modern automobiles. Its appearance has promoted the progress and development of front-wheel drive vehicles and all-wheel drive vehicles. The ball cage type constant velocity universal joint is generally divided into two types: fixed type and telescopic type. The fixed type is commonly known as the "external ball cage" in the industry, and the telescopic type is the "inner ball cage". Among them, the fixed ball cage type constant velocity universal joint includes an outer star wheel and an inner star wheel, both of which are provided with raceways. The processing of the raceways generally includes soft milling rough processing before heat treatment and hard milling finishing after heat treatment. Milling processing requires the use of a milling cutter to achieve.

[0003] The ball end milling cutter in the prior art generally includes a cutter body and a blade. For example, the patent application document with application publication number CN113857541A discloses a ball end milling cutter and a processing method thereof for processing a universal joint ball cage shell. The patent application document provides a ball end milling cutter for processing a universal joint ball cage shell, which includes an integrally connected cutter body and a cutter handle. The cutter body is configured as a hemispherical shape as a whole, and the top of the cutter body is configured as a circular plane. The side surface of the cutter body is provided with four evenly arranged guide surfaces. A protrusion is formed between the two adjacent guide surfaces, and a blade is fixedly provided on the guide surface. However, in the ball end milling cutter, the blade has no front angle, and relies on the arc-shaped blade to cut the workpiece. The cutting direction is perpendicular to the front cutting surface of the blade, which makes cutting more laborious and the blade is easy to break. Utility Model Content

[0004] The utility model provides a machine-clamped ball-end milling cutter to solve the technical problems in the prior art that the ball-end milling cutter has difficulty in cutting and the blade is easy to break.

[0005] In order to solve the above problems, the utility model provides a machine-clamped ball-end milling cutter adopting the following technical solutions:

[0006] A machine-clamped ball-end milling cutter, comprising:

[0007] A cutter body, wherein a milling blade is arranged at the front end of the cutter body, and the milling blade has a front cutting surface;

[0008] A chip removal groove is provided on the outer wall of the cutter body and is located beside the milling blade;

[0009] It is characterized in that

[0010] The front cutting surface is inclined away from the chip groove from the inside to the outside in the radial direction of the cutter body, so that the milling insert forms a negative radial rake angle; at the same time, the front cutting surface is inclined away from the chip groove from the back to the front, so that the milling insert forms a negative axial rake angle;

[0011] The front end of the milling blade protrudes from the front end surface of the cutter body, a chip space is formed between the front end of the milling blade and the front end surface of the cutter body, and the chip removal groove is communicated with the chip space.

[0012] The beneficial effects of the above technical solution are: by setting a negative axial rake angle and a negative radial rake angle, the chips can be discharged forward, and the blade is more resistant to collapse. The cutting edge of the milling blade can be tilted forward to avoid the rear part of the cutting edge of the milling blade from contacting the workpiece, and the cutting is sharper. A chip space is formed at the front end of the cutter body, which can be used to accommodate the chips that enter the front end of the tool during the cutting process, and avoid the distance between the front end of the tool and the workpiece being too small, causing the chips to be stuck between the tool and the workpiece and causing wear to the tool or the workpiece. At the same time, the chip space is connected to the chip groove, and the chips in the chip space can enter the chip groove and be discharged by the chip groove, further avoiding chip blockage.

[0013] Furthermore, the front end surface of the tool body includes a guiding slope inclined from front to back toward the chip groove.

[0014] The beneficial effect of the above technical solution is that the guiding inclined surface is used to guide the chips, so that the chips in the chip holding space can enter the chip discharge groove easily.

[0015] Furthermore, the width of the chip removal groove decreases from front to back.

[0016] The beneficial effects of the above technical solution are: the slot width at the front end of the chip removal slot is larger, which is convenient for chips to enter, and the slot width at the rear end is smaller, which is convenient for chips to be discharged in a concentrated manner.

[0017] Furthermore, the flute wall of the chip removal flute is inclined from front to back away from the axis of the cutter body.

[0018] The beneficial effect of the above technical solution is that it is convenient to guide the chips to be discharged outwards.

[0019] Furthermore, the front cutting edge is arranged toward the corresponding chip removal groove, and the front cutting edge is flush with the corresponding groove wall in the chip removal groove.

[0020] The beneficial effect of the above technical solution is to avoid the formation of grooves between the milling cutter blade and the wall of the chip groove to jam the chips in the chip groove.

[0021] Furthermore, a blade mounting groove is provided on the cutter body, a connecting hole is provided on the milling blade, a connecting bolt is passed through the connecting hole, and the milling blade is fixed in the blade mounting groove by the connecting bolt;

[0022] The milling blade has a first cutting edge and a second cutting edge arranged in a centrally symmetrical manner, and the two ends of the connecting hole are arranged in a centrally symmetrical manner on the milling blade about the symmetry center of the first cutting edge and the second cutting edge; one of the first cutting edge and the second cutting edge protrudes from the front end surface of the blade body, and the other cutting edge is located in the blade mounting groove.

[0023] The beneficial effect of the above technical solution is that the milling blade is detachably connected to the cutter body by a connecting bolt. Compared with the connection method of welding the blade to the cutter body, when the blade is worn, only the blade can be replaced without replacing the entire tool, which can save costs. By providing two centrally symmetrically arranged cutting edges on the milling blade, when one of the cutting edges is worn, it is not necessary to replace a new milling blade. The milling blade only needs to be rotated 180 degrees and the second cutting edge can be adjusted to the position of the first cutting edge for continued use, which can effectively avoid frequent replacement of the milling blade and further reduce the cost of using the tool.

[0024] Furthermore, the milling blade is a quadrangular prism structure with a parallelogram cross-section, one of the bottom surfaces of the milling blade with the quadrangular prism structure forms the front cutting surface of the milling blade, and the edges where the two acute angles of the front cutting surface are located respectively form the first cutting edge and the second cutting edge of the milling blade.

[0025] The beneficial effect of the above technical solution is that such a milling blade has higher structural strength and better cutting effect.

[0026] Furthermore, a cooling channel is provided in the cutter body, and the cooling channel has a cooling outlet, and the cooling outlet is located on the slot wall of the chip removal slot and is arranged toward the milling cutter blade.

[0027] The beneficial effect of the above technical solution is that the cooling medium is discharged to the milling cutter through the cooling channel, which is beneficial to cooling the milling cutter and the workpiece and facilitating the discharge of chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0029] Figure 1 A schematic diagram of the structure of a machine-clamped ball-end milling cutter provided by the utility model Figure 1 ;

[0030] Figure 2 A schematic diagram of the structure of a machine-clamped ball-end milling cutter provided by the utility model Figure 2 ;

[0031] Figure 3 A schematic diagram of the structure of a machine-clamped ball-end milling cutter provided by the utility model Figure 3 ;

[0032] Figure 4 A schematic diagram of the structure of a cutter body in a machine-clamped ball-end milling cutter provided by the utility model;

[0033] Figure 5 The utility model provides a schematic structural diagram of a milling blade in a machine-clamped ball-end milling cutter.

[0034] Description of reference numerals:

[0035] 1. Cutter body; 101. Guide bevel; 2. Milling blade; 201. Connecting hole; 202. Front cutting edge; 203. First cutting edge; 204. Second cutting edge; 3. Connecting bolt; 4. Chip groove; 401. First groove wall; 402. Second groove wall; 5. Blade mounting groove; 6. Avoidance groove; 7. Front end face; 8. Cooling outlet; 9. Threaded hole; 10. Cutter handle. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] The following is an embodiment of a machine-clamped ball-end milling cutter provided by the utility model:

[0038] like Figure 1 As shown, a machine-clamped ball end milling cutter comprises a cutter body 1, the cutter body 1 is cylindrical, and the front end of the outer wall of the cutter body 1 is arc-shaped. The front end of the cutter body 1 has a front end face 7, and three blade mounting grooves 5 are evenly arranged on the outer periphery of the front end face 7. The blade mounting groove 5 has three positioning surfaces, and a cylindrical avoidance notch 6 is provided at the connection position of each two adjacent positioning surfaces. An inclined threaded hole 9 is provided on the positioning surface close to the axis of the cutter body 1.

[0039] A milling blade 2 is arranged in the blade mounting groove 5. Figure 5 As shown, the milling blade 2 is a quadrangular prism structure with a parallelogram cross section, and the four vertical edges of the milling blade 2 are all chamfered with arcs. The upper bottom surface of the milling blade 2 is a rake face 202, and the edges of the two acute angles of the rake face 202 are respectively the first cutting edge 203 and the second cutting edge 204 of the milling blade 2, and the first cutting edge 203 and the second cutting edge 204 are symmetrical about the central axis of the milling blade.

[0040] The two sides of the four sides of the milling blade 2 that are relatively arranged and have a narrower width are defined as the first side and the second side, and the other two sides that are relatively arranged and have a wider width are defined as the third side and the fourth side. The plane located between the upper bottom surface and the lower bottom surface of the milling blade 2 and having an equal distance from the upper bottom surface and the lower bottom surface of the milling blade 2 is defined as the first symmetry plane, and the plane located between the first side surface and the second side surface of the milling blade 2 and having an equal distance from the first side surface and the second side surface is defined as the second symmetry plane. The milling blade 2 is provided with a connecting hole 201. In order to prevent the head of the connecting bolt 3 from leaking out, the connecting hole 201 is processed into a countersunk hole. The hole axis of the connecting hole 201 is located on the intersection of the first symmetry plane and the second symmetry plane. The connecting bolt 3 passes through the connecting hole 201 and is screwed into the threaded hole 9 on the cutter body 1 to fix the milling blade 2 in the blade mounting groove 5. The first blade portion 203 of the milling blade 2 protrudes from the front end face 7, and the second blade portion 204 is located in the blade mounting groove 5.

[0041] Each of the above-mentioned blade mounting grooves 5 is provided with a chip groove 4 on its side, the chip groove 4 is connected to the blade mounting groove 5, the groove width of the chip groove 4 decreases from front to back, the chip groove 4 has a first groove wall 401 and a second groove wall 402, the first groove wall 401 and the second groove wall 402 are away from each other along the radial direction of the cutter body 1 from the center to the outside of the cutter body 1, and at the same time, the first groove wall 401 and the second groove wall 402 are inclined away from the central axis of the cutter body 1 from front to back. The above-mentioned blade mounting groove 5 is provided on the second groove wall 402, after the milling blade 2 is installed in the blade mounting groove 5, the front cutting surface 202 is flush with the second groove wall 402, and when the tool is performing milling processing, the direction of rotation of the tool is from the milling blade 2 to the chip groove 4.

[0042] The front cutting surface 202 is inclined away from the first groove wall 401 from back to front, so that the milling blade 2 forms a negative axial rake angle. At the same time, the front cutting surface 202 is inclined away from the first groove wall 401 from inside to outside in the radial direction of the cutter body 1, so that the milling blade 2 forms a negative radial rake angle.

[0043] A chip space is formed between the front end of the milling blade 2 and the front end face 7 of the cutter body. The chip groove 4 is connected to the chip space. The front end face 7 is provided with three guiding inclined surfaces 101 which are inclined from front to back toward the corresponding chip groove 4 .

[0044] A tapered tool holder 10 is provided at the rear end of the tool body 1. A cooling channel is provided in the tool body 1 and the tool holder 10. The cooling channel includes a main channel and three branch channels. The three branch channels are provided at the front end of the main channel and are connected to the main channel. The rear end of the main channel extends to the rear end surface of the tool holder 10 to form a cooling inlet. The front ends of the branch channels extend to the first groove wall 401 in each chip groove 4 to form a cooling outlet 8. The branch channels are arranged at an angle so that the cooling outlet 8 faces the front cutting edge 202 of the corresponding milling cutter 2.

[0045] When the utility model is in use, the workpiece is cut by driving the tool to rotate. During the cutting process, the first edge 203 of the milling blade 2 contacts the workpiece, and part of the generated chips are discharged along the chip groove 4, and part of the chips enter the chip space at the front end of the cutter body 1. By introducing coolant into the cooling channel and spraying the coolant onto the milling blade 2, the milling blade 2 can be cooled. At the same time, the sprayed coolant can also pass through the chip groove 4, carry the chips in the chip groove 4 to be discharged, and pass through the chip space, bring the chips in the chip space to the chip groove 4 and discharge. After the tool has been used for a period of time, the first edge 203 of the milling blade 2 will be worn. The worn milling blade 2 is removed from the cutter body 1, and then the milling blade 2 is rotated 180 degrees to adjust the second edge 204 to the position of the first edge 203. The milling blade 2 is fixed to the cutter body 1 using the connecting bolt 3, and then it can continue to be used.

[0046] The utility model makes the milling cutter blade more resistant to chipping and sharper in cutting by setting a negative axial rake angle and a negative radial rake angle; by setting a chip accommodating space, it can prevent chips from being stuck between the front end of the cutter body and the workpiece and causing wear to the cutter or the workpiece, making it easier to remove chips; two cutting edges are arranged on the milling cutter blade, and the orientation of the milling cutter blade can be adjusted after one of the cutting edges is worn so that the other cutting edge can perform cutting processing, effectively reducing the use cost of the milling cutter.

[0047] In this embodiment, the milling blade is a quadrangular prism structure with a parallelogram cross section. In other embodiments, the milling blade may be a quadrangular prism structure with a square or rhombus cross section.

[0048] In this embodiment, the width of the chip removal groove decreases from front to back. In other embodiments, the width of the chip removal groove is a constant value and does not change from front to back.

[0049] In this embodiment, the first groove wall and the second groove wall in the chip groove are inclined from front to back away from the central axis of the tool body. In other embodiments, the first groove wall and the second groove wall are not inclined in the front-to-back direction.

Claims

1. A machine-clamped ball-end milling cutter, comprising: A cutter body, wherein a milling blade is arranged at the front end of the cutter body, and the milling blade has a front cutting surface; A chip removal groove is provided on the outer wall of the cutter body and is located beside the milling blade; It is characterized in that The front cutting surface is inclined away from the chip groove from the inside to the outside in the radial direction of the cutter body, so that the milling insert forms a negative radial rake angle; at the same time, the front cutting surface is inclined away from the chip groove from the back to the front, so that the milling insert forms a negative axial rake angle; The front end of the milling blade protrudes from the front end surface of the cutter body, a chip space is formed between the front end of the milling blade and the front end surface of the cutter body, and the chip removal groove is communicated with the chip space.

2. A machine-clamped ball end milling cutter according to claim 1, characterized in that: The front end surface of the tool body comprises a guiding inclined surface which is inclined from front to rear toward the chip discharge groove.

3. A machine-clamped ball end milling cutter according to claim 2, characterized in that: The slot width of the chip removal slot decreases from front to back.

4. A machine-clamped ball end milling cutter according to claim 3, characterized in that: The flute wall of the chip removal flute is inclined from front to back away from the axis of the cutter body.

5. A machine-clamped ball end milling cutter according to claim 4, characterized in that: The front cutting surface is arranged toward the corresponding chip removal groove, and the front cutting surface is flush with the corresponding groove wall in the chip removal groove.

6. A machine-clamped ball end milling cutter according to any one of claims 1 to 5, characterized in that: The cutter body is provided with a blade installation groove, the milling blade is provided with a connecting hole, a connecting bolt is passed through the connecting hole, and the milling blade is fixed in the blade installation groove by the connecting bolt; The milling blade has a first cutting edge and a second cutting edge arranged in a centrally symmetrical manner, and the two ends of the connecting hole are arranged in a centrally symmetrical manner on the milling blade about the symmetry center of the first cutting edge and the second cutting edge; one of the first cutting edge and the second cutting edge protrudes from the front end surface of the blade body, and the other cutting edge is located in the blade mounting groove.

7. The machine-clamped ball end milling cutter according to claim 6, characterized in that: The milling blade is a quadrangular prism structure with a parallelogram cross section, one of the bottom surfaces of the milling blade of the quadrangular prism structure forms the front cutting surface of the milling blade, and the edges where the two acute angles of the front cutting surface are located respectively form the first cutting edge and the second cutting edge of the milling blade.

8. A machine-clamped ball end milling cutter according to any one of claims 1 to 5, characterized in that: The cutter body is provided with a cooling channel, the cooling channel having a cooling outlet, and the cooling outlet is located on the slot wall of the chip removal slot and is arranged toward the milling cutter blade.

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