One-step forming asymmetric convex tooth cutting milling cutter disc

Abstract

The utility model discloses a one -off forming asymmetric convex tooth cutting milling cutter head, including integrative cutter body and axle joint, and the side of cutter body has high, low cutting tooth alternately. Low cutting tooth is equipped with single cutter particle unit and forms tooth top cutting portion, and high cutting tooth's upper and lower tooth part is equipped with two cutter particle units and forms tooth side cutting portion respectively, and the rotation track of two is different, realizes synchronous one -off milling and exports asymmetric convex tooth complete profile, and the multi -process circulation is saved, and the efficiency and batch accuracy consistency are improved significantly. The blade edge of two cutter particle units of high cutting tooth is towards the middle groove, and the first and second tooth side bevel angles of absolute value inequality are formed with the radial, and the asymmetric tooth side is directly and accurately constructed. The positioning groove specification is unified, supports the same specification cutter particle disorderly installation, and is convenient for maintaining, and the curved chip guide step optimizes the chip removal, and improves the surface quality and tool life.

Description

Technical Field

[0001] This utility model relates to the field of milling tool technology, and in particular to a one-time forming asymmetric convex tooth cutting milling cutter disc. Background Technology

[0002] Asymmetric convex teeth refer to the tooth profile on gears or similar transmission components that does not satisfy mirror symmetry, meaning that the parameters on both sides of the tooth are inconsistent. This design is typically used to optimize transmission performance or adapt to special operating conditions.

[0003] Currently, the mainstream machining method for asymmetric convex teeth in the industry still generally relies on multi-stage step-by-step milling processes. Specifically, it usually requires multiple independent processes, such as rough milling of the tooth blank contour, semi-finish milling to approximate the theoretical tooth shape, finish milling to trim details, and tooth-by-tooth indexing and positioning.

[0004] However, the current multi-process distributed milling process has the following problems: 1. Low processing efficiency: The flow of multiple processes increases auxiliary operation time and prolongs the processing cycle of a single product, making it difficult to meet the demand of modern manufacturing for efficient production; 2. Difficulty in controlling precision consistency: Due to the independent positioning errors between each process, the accumulation of tool wear, and the differences in thermal deformation and elastic deformation of the process system, it is difficult to effectively control the tooth profile deviation between workpieces in the same batch. During batch production, the product precision stability is insufficient, and the scrap rate is high; 3. Limited upper limit of precision: Tool marks and accumulated errors in each process are unavoidable in step-by-step machining. Moreover, the finish milling process is often limited by the basic shape of the tooth blank determined by the previous process, making it difficult to achieve the optimal one-time forming of the complex contour of asymmetrical teeth. This limits the upper limit of dimensional accuracy, surface quality, and contour accuracy that asymmetrical convex teeth can achieve, making it difficult to meet the stringent requirements of high-end equipment for ultra-high precision transmission components. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a one-time forming asymmetrical convex tooth cutting milling cutter disc, which achieves a high-efficiency machining process of roughing and finishing in one step and simultaneous forming of multiple surfaces, reducing milling cutter clamping errors in traditional processes and improving machining efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a one-piece molded asymmetrical convex tooth cutting milling cutter disc, comprising an integrally molded cutter disc body and a shaft connection portion. The side of the cutter disc body is provided with multiple high-cutting teeth and low-cutting teeth, which are spaced apart along the circumferential direction and alternately distributed. A cutting bit unit is provided at the center of each low-cutting tooth, the cutting edge of which protrudes from the high-cutting tooth along the radial direction of the cutter disc body, forming a tooth tip cutting portion. The high-cutting tooth comprises an integrally molded upper tooth portion and a lower tooth portion. An open-shaped intermediate groove is formed between the upper and lower teeth. Two additional cutting inserts are fixedly installed on the same side of the upper and lower teeth respectively. The cutting edges of these two cutting inserts protrude from the low cutting teeth in the radial direction of the cutter head body, and the cutting edges of these two cutting inserts protrude towards the intermediate groove respectively, forming a tooth side cutting part between them. The tooth tip cutting part of each high cutting tooth is located on the same rotation trajectory R1. The tooth side cutting part of each low cutting tooth is located on the same rotation trajectory R2. The rotation trajectory R2 is greater than the rotation trajectory R1, so as to mill the tooth height.

[0007] In a further technical solution, the milling rotation direction of the cutter head body is set clockwise or counterclockwise, and each cutting bit unit is fastened to the same side of the corresponding high cutting tooth or low cutting tooth. In this case, along the rotation direction of the cutter head body, the lower tooth is located in front of the upper tooth to form a front-to-back arrangement of high cutting teeth.

[0008] In a further technical solution, a recessed low-cutting positioning groove is formed on one side of the low-cutting tooth. The low-cutting positioning groove is horizontally positioned and extends to the end face of the low-cutting tooth. The insert unit is engaged and positioned in the low-cutting positioning groove and is fastened with bolts. On the same side of the upper tooth, a recessed first high-cutting positioning groove is formed. The first high-cutting positioning groove is inclined upwards, with its outer side extending to the end face of the upper tooth and its lower side extending to the intermediate groove. Another insert unit is engaged and positioned in the first high-cutting positioning groove and is fastened with bolts. The cutting edge forms a first tooth flank angle α with the radial direction of the cutter head body; a second high-cutting positioning groove with a notch is provided on the same side of the lower tooth, the second high-cutting positioning groove is inclined downward, the outer side of the second high-cutting positioning groove extends to the end face of the lower tooth, and the upper side extends to the middle groove, another cutting bit unit is embedded and positioned in the second high-cutting positioning groove and is fastened by bolts, the cutting edge of this cutting bit unit forms a second tooth flank angle b with the radial direction of the cutter head body, the absolute values ​​of the first tooth flank angle α and the second tooth flank angle b are not the same, and the difference between their absolute values ​​is greater than or equal to 5°.

[0009] In a further technical solution, the low-cut positioning groove, the first high-cut positioning groove, and the second high-cut positioning groove are all the same in size, shape, and specifications, so as to achieve disordered installation of blade units of the same specifications.

[0010] In a further technical solution, an arc-shaped chip-guiding step is formed at the connection between the upper and lower teeth.

[0011] In a further technical solution, the number of high-cutting teeth and low-cutting teeth is the same, and a transition angle is formed between the high-cutting teeth and low-cutting teeth, with the angle of the transition angle being less than or equal to 45°.

[0012] In a further technical solution, the number of high-cutting teeth and low-cutting teeth are four each, and the transition angle formed between the high-cutting teeth and low-cutting teeth is 45°.

[0013] In a further technical solution, the rotation trajectory of each blade unit and the coaxiality of the cutter head body are less than or equal to 0.01 mm.

[0014] In a further technical solution, a shaft hole is provided at the center of the shaft connection part, and a notched linkage keyway is formed on both sides of the upper opening of the shaft hole; a disk cavity is provided at the center of the cutter head body, and the disk cavity and the shaft hole are coaxially connected. The diameter of the disk cavity is larger than that of the shaft hole, and a limiting step is formed at the connection between the two to block and lock the output shaft of the host computer.

[0015] In a further technical solution, the opening of the disc cavity is chamfered.

[0016] The advantages of this invention compared to the prior art after adopting the above structure are: 1. The cutter head body is integrally formed with alternating high-cutting and low-cutting teeth. A single cutting bit unit on the low-cutting tooth forms the tooth tip cutting section, while two cutting bit units on the high-cutting tooth together form the tooth flank cutting section. When the cutter head rotates, the cutting bit units on the high and low cutting teeth can simultaneously and in one pass mill the complete contour of the asymmetrical convex tooth, including the tooth tip and both sides of the tooth flank. Compared to traditional multi-process milling, this fundamentally eliminates the auxiliary time loss caused by multi-process flow, significantly shortens the single-piece machining cycle, and greatly improves machining efficiency. Furthermore, by avoiding the accumulation of positioning errors from multiple processes, tool change errors, and secondary workpiece clamping errors between processes, it effectively ensures the consistency of dimensional accuracy, shape accuracy, and positional accuracy of the asymmetrical convex tooth during mass production, reducing the scrap rate.

[0017] 2. Two cutting edge units are fixedly installed on the upper and lower tooth sections respectively. The cutting edges of these two cutting edge units protrude towards the central groove and form a first tooth flank angle 'a' and a second tooth flank angle 'b' with the radial direction of the cutter head body, respectively. This unique structure allows for the direct and precise formation of asymmetrical tooth flanks with different tooth profile parameters on both sides when milling asymmetrical convex teeth, without relying on subsequent dressing processes.

[0018] 3. The low-cut positioning groove, the first high-cut positioning groove, and the second high-cut positioning groove are all the same size, shape, and specifications. They can be installed in an unordered manner using cutting insert units of the same specifications, which simplifies the management and inventory of cutting inserts and facilitates the quick replacement of worn cutting inserts.

[0019] 4. The connection between the upper and lower teeth forms an arc-shaped chip guide step, which can effectively guide and remove the chips generated during the cutting process, avoid chip accumulation between the teeth affecting cutting accuracy, aggravating tool wear or causing vibration, thereby improving the surface quality of the machined surface and extending tool life. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the disassembly of the blade unit in this utility model.

[0023] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0024] Figure 4 This is a side view structural diagram of the present invention.

[0025] Figure 5 This is a schematic diagram of the utility model from a downward viewing angle. Detailed Implementation

[0026] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0027] like Figures 1 to 5As shown, a one-piece molded asymmetric toothed milling cutter head includes an integrally molded cutter head body 2 and a shaft connection part 1. The side of the cutter head body 2 is provided with multiple high-cutting teeth 22 and low-cutting teeth 21. Each high-cutting tooth 22 and each low-cutting tooth 21 is spaced apart along the circumferential direction, and the high-cutting teeth 22 and each low-cutting tooth 21 are alternately distributed. A cutting edge unit 3 is provided at the middle position of the low-cutting tooth 21. The cutting edge of this cutting edge unit 3 protrudes from the high-cutting tooth 22 along the radial direction of the cutter head body 2, forming a tooth tip cutting portion. The high-cutting tooth 22 includes an integrally molded upper tooth portion 221 and a lower tooth portion 222. The upper tooth portion 221... An open intermediate groove 223 is formed between the upper tooth 221 and the lower tooth 222. Two other cutting edge units 3 are fixedly installed on the same side of the upper tooth 221 and the lower tooth 222. The cutting edges of these two cutting edge units 3 protrude from the low cutting tooth 21 in the radial direction of the cutter head body 2, and the cutting edges of these two cutting edge units 3 protrude toward the intermediate groove 223, forming a tooth side cutting part between them. The tooth tip cutting part of each high cutting tooth 22 is respectively located on the same rotation trajectory R1. The tooth side cutting part of each low cutting tooth 21 is respectively located on the same rotation trajectory R2. The rotation trajectory R2 is greater than the rotation trajectory R1, so as to mill the tooth height.

[0028] The cutter head body is integrally formed with alternating high-cutting teeth 22 and low-cutting teeth 21. A single cutting bit unit 3 on the low-cutting tooth 21 forms the tooth tip cutting section, while two cutting bit units 3 on the high-cutting tooth 22 together form the tooth flank cutting section. When the cutter head rotates, the cutting bit units 3 on the high and low cutting teeth can simultaneously and in one pass mill the complete contour of the asymmetric convex tooth, including the tooth tip and the tooth flanks on both sides. Compared with traditional multi-process milling, this fundamentally eliminates the auxiliary time loss caused by multi-process flow, significantly shortens the single-piece machining cycle, and greatly improves machining efficiency. Furthermore, by avoiding the accumulation of positioning errors from multiple processes, tool change errors, and secondary workpiece clamping errors between processes, it effectively ensures the consistency of dimensional accuracy, shape accuracy, and positional accuracy of the asymmetric convex tooth during mass production, reducing the scrap rate.

[0029] Specifically, the milling rotation direction of the cutter head body 2 is set clockwise or counterclockwise, and each cutting bit unit 3 is fastened to the same side of the corresponding high cutting tooth 22 or low cutting tooth 21. In the rotation direction of the cutter head body 2, the lower tooth 222 is located in front of the upper tooth 221 to form a front-to-back arrangement of high cutting teeth 22.

[0030] Specifically, a low-cutting tooth 21 has a recessed low-cutting positioning groove 210 on one side. The low-cutting positioning groove 210 is horizontal and extends to the end face of the low-cutting tooth 21. The insert unit 3 is engaged and positioned in the low-cutting positioning groove 210 and is fastened with bolts. On the same side of the upper tooth 221, a recessed first high-cutting positioning groove 2210 is provided. The first high-cutting positioning groove 2210 is inclined upward. The outer side of the first high-cutting positioning groove 2210 extends to the end face of the upper tooth 221, and the lower side extends to the intermediate groove 223. Another insert unit 3 is engaged and positioned in the first high-cutting positioning groove 2210 and is fastened with bolts. This insert unit... The cutting edge of the element 3 forms a first tooth flank angle a with the radial direction of the cutter head body 2; a second high-cutting positioning groove 2220 with a notch is provided on the same side of the lower tooth portion 222. The second high-cutting positioning groove 2220 is inclined downward. The outer side of the second high-cutting positioning groove 2220 extends to the end face of the lower tooth portion 222 and the upper side extends to the middle groove 223. Another cutting bit unit 3 is embedded and positioned in the second high-cutting positioning groove 2220 and is fastened by bolts. The cutting edge of this cutting bit unit 3 forms a second tooth flank angle b with the radial direction of the cutter head body 2. The absolute values ​​of the first tooth flank angle a and the second tooth flank angle b are not the same, and the difference between their absolute values ​​is greater than or equal to 5°.

[0031] Two cutting edge units 3 are fixedly mounted on the upper tooth section 221 and the lower tooth section 222, respectively. The cutting edges of these two cutting edge units 3 protrude towards the central groove 223 and form a first tooth flank angle 'a' and a second tooth flank angle 'b' with unequal absolute values ​​radially with the cutter head body 2. This unique structure enables the direct and precise formation of asymmetrical tooth flanks with different tooth profile parameters on both sides when milling asymmetrical convex teeth, without relying on subsequent dressing processes.

[0032] Specifically, the low-cut positioning groove 210, the first high-cut positioning groove 2210 and the second high-cut positioning groove 2220 are all the same in size, shape and specifications, so as to achieve random installation of the blade units 3 of the same specifications.

[0033] The low-cut positioning groove 210, the first high-cut positioning groove 2210 and the second high-cut positioning groove 2220 are all the same size, shape and specifications. They can be installed in a disordered manner using cutting insert units 3 of the same specifications, which simplifies the management and inventory of cutting inserts and facilitates the quick replacement of worn cutting inserts.

[0034] Specifically, an arc-shaped chip guide step 224 is formed at the connection between the upper tooth portion 221 and the lower tooth portion 222.

[0035] The connection between the upper and lower teeth forms an arc-shaped chip guide step, which can effectively guide and remove the chips generated during the cutting process, preventing chips from accumulating between the teeth and affecting cutting accuracy, aggravating tool wear, or causing vibration, thereby improving the surface quality of the machined surface and extending tool life.

[0036] Specifically, the number of high-cutting teeth 22 and low-cutting teeth 21 is the same, and a transition angle is formed between the high-cutting teeth 22 and low-cutting teeth 21; the number of high-cutting teeth 22 and low-cutting teeth 21 is four each, and the size of the transition angle formed between the high-cutting teeth 22 and low-cutting teeth 21 is 45°.

[0037] Specifically, the coaxiality between the rotation trajectory of each blade unit 3 and the cutter head body 2 is less than or equal to 0.01 mm.

[0038] Specifically, a shaft hole 10 is provided at the center of the shaft connection part 1, and a notched linkage keyway 11 is formed on both sides of the upper opening of the shaft hole 10; a disk cavity 20 is provided at the center of the cutter head body 2, and the disk cavity 20 and the shaft hole 10 are coaxially connected. The diameter of the disk cavity 20 is larger than that of the shaft hole 10, and a limiting step 12 is formed at the connection between the two to block and lock the output shaft of the host computer.

[0039] Specifically, the opening of the cavity 20 is formed with a chamfer 201.

[0040] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A one-piece molded asymmetric toothed milling cutter head, comprising an integrally molded cutter head body (2) and a shaft connection part (1), characterized in that: The side of the cutter head body (2) is provided with a plurality of high cutting teeth (22) and low cutting teeth (21). Each high cutting tooth (22) and each low cutting tooth (21) is arranged at intervals along the circumferential direction, and each high cutting tooth (22) and each low cutting tooth (21) is arranged alternately. Among them, a cutting element unit (3) is provided in the middle position of the low cutting tooth (21). The cutting edge of this cutting element unit (3) protrudes from the high cutting tooth (22) in the radial direction of the cutter body (2) and forms the tooth tip cutting part. The high-cutting tooth (22) includes an integrally formed upper tooth (221) and lower tooth (222). An open intermediate groove (223) is formed between the upper tooth (221) and the lower tooth (222). Two other cutting bit units (3) are fixedly installed on the same side of the upper tooth (221) and the lower tooth (222). The cutting edges of these two cutting bit units (3) protrude from the low-cutting tooth (21) along the radial direction of the cutter body (2), and the cutting edges of these two cutting bit units (3) protrude toward the intermediate groove (223) respectively, forming a tooth side cutting part between them. The tooth tip cutting portion of each high-cutting tooth (22) is on the same rotation trajectory R1; the tooth side cutting portion of each low-cutting tooth (21) is on the same rotation trajectory R2, and the rotation trajectory R2 is greater than the rotation trajectory R1, so as to form the height of the convex tooth by milling.

2. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 1, characterized in that: The milling rotation direction of the cutter head body (2) is set clockwise or counterclockwise, and each of the cutting bit units (3) is respectively fastened to the same side of the corresponding high cutting tooth (22) or low cutting tooth (21). Along the rotation direction of the cutter head body (2), the lower tooth (222) is located in front of the upper tooth (221) to form a high cutting tooth (22) with a front-to-back arrangement.

3. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 2, characterized in that: The low-cutting tooth (21) has a recessed low-cutting positioning groove (210) on one side. The low-cutting positioning groove (210) is horizontal and extends to the end face of the low-cutting tooth (21). The cutting bit unit (3) is embedded in the low-cutting positioning groove (210) and is fastened by bolts. A first high-cut positioning groove (2210) with a notch is provided on the same side of the upper tooth (221). The first high-cut positioning groove (2210) is inclined upward. The outer side of the first high-cut positioning groove (2210) extends to the end face of the upper tooth (221), and the lower side extends to the intermediate groove (223). Another cutting bit unit (3) is fitted and positioned in the first high-cut positioning groove (2210) and is fastened by bolts. The cutting edge of this cutting bit unit (3) forms a first tooth side angle α with the radial direction of the cutter body (2). A notch is provided on the same side of the lower tooth (222). The second high-cut positioning groove (2220) is set in a downward inclined manner. The outer side of the second high-cut positioning groove (2220) extends to the end face of the lower tooth (222), and the upper side extends to the middle groove (223). Another cutting bit unit (3) is embedded and positioned in the second high-cut positioning groove (2220) and is fastened by bolts. The cutting edge of this cutting bit unit (3) forms a second tooth side angle b with the radial direction of the cutter head body (2). The absolute values ​​of the first tooth side angle a and the second tooth side angle b are not the same, and the difference between their absolute values ​​is greater than or equal to 5°.

4. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 3, characterized in that: The low-cut positioning groove (210), the first high-cut positioning groove (2210) and the second high-cut positioning groove (2220) are all the same in size and shape, so as to achieve random installation of the blade unit (3) of the same specification.

5. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 4, characterized in that: An arc-shaped chip guide step (224) is formed at the connection between the upper tooth (221) and the lower tooth (222).

6. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 1, characterized in that: The number of high-cutting teeth (22) and low-cutting teeth (21) is the same, and a transition angle is formed between the high-cutting teeth (22) and the low-cutting teeth (21), with the angle of the transition angle being less than or equal to 45°.

7. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 5, characterized in that: The number of high-cutting teeth (22) and low-cutting teeth (21) are four each, and the transition angle between the high-cutting teeth (22) and low-cutting teeth (21) is 45°.

8. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 1, characterized in that: The coaxiality between the rotation trajectory of each blade unit (3) and the blade disc body (2) is less than or equal to 0.01 mm.

9. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 1, characterized in that: The shaft connection part (1) has a shaft hole (10) at its center, and the upper opening of the shaft hole (10) has recessed linkage keyways (11) on both sides; the cutter head body (2) has a disc cavity (20) at its center, and the disc cavity (20) and the shaft hole (10) are coaxially connected. The diameter of the disc cavity (20) is larger than that of the shaft hole (10), and a limiting step (12) is formed at the connection between the two to block and lock the output shaft of the host computer.

10. The one-piece forming asymmetric convex tooth cutting milling cutter disc according to claim 9, characterized in that: The opening of the cavity (20) is chamfered (201).

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