Multi-die extrusion rolling die and method for inner helical gear ring

Abstract

The invention relates to a multi-die extrusion rolling die and method for an inner helical gear ring, and belongs to the field of gear ring manufacturing. According to the technical scheme, the inner helical gear ring multi-die rolling die comprises a lower die assembly and an upper die assembly, the lower die assembly comprises a lower die base and a lower pushing device, the lower die base is cylindrical and is connected with a rotation driving device, and the pushing end of the lower pushing device is located on the lower portion of a cylindrical inner cavity; the upper die assembly comprises a plurality of die single bodies, the die single bodies are evenly distributed in the circumferential direction with the rotation center of the lower die base as the axis, the die single bodies are cylindrical, and beveling teeth are evenly arranged on the outer circumferential faces of the die single bodies. According to the rolling equipment for the inner helical gear ring, shape rolling and multiple local forming are completed through relative rotation and linear feeding of the blank and the pressing die and multiple times of machining, the tonnage needed by the equipment is greatly reduced, rolling manufacturing of the inner helical gear ring is achieved based on the equipment, and the equipment cost and the process complexity are greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of gear ring manufacturing, in particular to a multi-die extrusion rolling die for an inner bevel gear ring, and a multi-die extrusion rolling method for an inner bevel gear ring. Background Art

[0002] As an important component in the transmission system, the internal bevel gear ring plays the role of power transmission, torque transmission and load bearing in some equipment. It is an indispensable basic component in the equipment manufacturing industry. Due to its outstanding advantages such as stable transmission, low impact noise, suitability for high-speed and heavy-load occasions and long service life, it is widely used in various types of reducers, gearboxes and other mechanical transmission devices. Based on the rapid development of my country's industrial technology, many fields have requirements for high-strength, high-life, high-precision internal bevel gear rings and green production. The traditional long-cycle, low-efficiency, and low-economic-benefit cutting processing has gradually failed to meet the requirements of equipment manufacturing and the development of the times. Therefore, the proposal of a fast, efficient, and green new internal bevel gear ring production process is imminent.

[0003] At present, the processing and manufacturing of internal helical gear rings are mainly based on subtractive forming methods such as gear hobbing, milling and grinding. The material utilization rate is low, the processing time is long, the production efficiency is low, and the cutting process cuts off the metal flow lines on the surface of the parts, resulting in reduced mechanical properties of the formed parts. In addition, the tools and equipment required for cutting and forming internal helical gear rings also have very high requirements. The gear cutting tool used has a complex surface and high strength requirements. The tool movement path during the processing is complex, and the requirements for the machine tool and its control system are high.

[0004] The equipment required for cutting internal bevel gear rings mainly includes gear cutting machines and gear grinding machines. High-precision internal bevel gear rings often require high-end CNC machine tools. The equipment cost is high. Specialized gear cutting machines and gear grinding machines are usually expensive, and the initial investment is large for small and medium-sized enterprises. The operation is complicated. The operation of high-end CNC machine tools requires high professional and technical personnel. The movement trajectory of the tool for cutting internal bevel gear rings is more complicated, and the operation requirements are significantly improved. The operation and maintenance costs are high, and the long processing time leads to high energy consumption for single-piece processing. Summary of the invention

[0005] The invention aims to solve the problems of low efficiency, high cost and complex control in the current processing of internal helical gear rings by gear cutting, gear hobbing and other processes, and provides an internal helical gear ring rolling forming device.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is a multi-die rolling die for an inner bevel gear ring, including a lower die assembly and an upper die assembly, the lower die assembly includes a lower die base and a lower pushing device, the lower die base is cylindrical, the lower die base is connected to a rotating drive device, and the pushing end of the lower pushing device is located at the lower part of the cylindrical inner cavity; the upper die assembly includes a plurality of die monomers, the plurality of die monomers are evenly distributed along the circumferential direction with the rotation center of the lower die base as the axis, the die monomers are cylindrical and the outer circumferential surface is evenly provided with bevel teeth. This solution provides a rolling device for an inner bevel gear ring, which completes the morphological rolling through multiple processes and multiple partial forming through relative rotation and linear feeding of the blank and the die, greatly reducing the tonnage required for the equipment. Based on this equipment, the rolling manufacturing of the inner bevel gear ring is realized, which greatly reduces the equipment cost and process complexity.

[0007] Preferably, the upper mold assembly further includes an upper pushing device, and the plurality of mold units are all mounted on the lifting end of the upper pushing device.

[0008] Preferably, the lower pushing device comprises a pushing ring and a lower pushing driving member, the pushing ring is located in the cylindrical inner cavity of the lower mold base, and the outer periphery of the pushing ring is in slidable contact with the inner wall of the lower mold base.

[0009] Preferably, the rotation driving device comprises a driving gear, and the outer peripheral surface of the lower mold base is provided with a gear ring portion, the driving gear is meshed with the gear ring portion, and the driving gear is also connected to a driving member.

[0010] Preferably, three mold units are provided, which are arranged at an interval of 120 degrees from each other.

[0011] Preferably, the beveled teeth on the outer periphery of the mold unit include a forming part and a trimming part, the trimming part is located below the forming part, and the tooth top circle of the trimming part is tangent to the tooth root circle of the internal bevel gear ring part; the tooth top of the forming part is an inclined surface, and is inclined toward the center direction of the mold unit relative to the tooth top of the trimming part.

[0012] Preferably, the tooth top inclination angle of the forming part relative to the tooth top of the trimming part is 3-15°, the outer diameter of the mold unit is Rb2, the pitch circle radius is R2, the height is Hd2, the center distance between the mold unit 1 and the blank is a1, and the root circle radius of the formed internal helical gear ring part is Rf, a1=Rf- Rb2.

[0013] Preferably, the height of the lower die base 3 is Hd1, the inner diameter is Rd1, the length of the mating portion of the push ring in the lower die base 3 is L1, the height of the blank is Hb, the outer diameter is Rb1, and the formula is satisfied: Hb <Hd1-L1; Rd1= Rb1-ε; Where ε is the interference.

[0014] Preferably, the number of teeth of the die unit 1 is Zd, the number of teeth of the formed internal helical gear ring is Zp, and the phase adjustment angle of the i-th extrusion die relative to the first extrusion die is , and satisfy the formula:

[0015] In the formula, i=1, 2, 3.

[0016] On the other hand, the present invention also provides a multi-die extrusion rolling method for an internal helical gear ring, comprising the following steps: S1. Place the blank into the accommodating cavity of the lower die base, place the blank concentrically with the accommodating cavity and the blank is not higher than the upper end surface of the lower die base, and the lower end surface of the blank contacts the pushing end of the lower pushing device; S2. Compound feed extrusion rolling forming, the die unit moves downward at a speed v1, and the lower die base drives the blank to rotate clockwise at an angular velocity ω1 until two-thirds of the trimming portion of the die unit is out of the lower end surface of the blank, satisfying the formula:

[0017] Where: β is the helix angle of the helical gear ring; S3. The mold is withdrawn, and the mold body moves upward at a speed v2. The lower mold base drives the blank to rotate counterclockwise at an angular velocity ω2 until the mold body returns to the initial position, satisfying the formula:

[0018] S4. The incremental forming area is transferred, and the lower die base drives the blank to rotate clockwise through an angle α, satisfying the formula:

[0019] S5. Repeat steps S2-S4 until a complete internal helical gear ring part is processed; S6. The mold unit is fully raised, so that the distance H between the lower end surface of the mold unit and the upper end surface of the lower mold base is greater than the height Hb of the blank. The lower pushing device moves upward to push the formed internal bevel gear ring part out from the top of the lower mold base to complete the unloading.

[0020] It can be seen from the above technical solutions that the advantages of the present invention are as follows: compared with the prior art, the present invention has a simple and compact structure, and multiple molds are partially formed in a single pass, so the tonnage required for the forming equipment can be greatly reduced; when the extrusion rolling forming equipment of the present invention is working, at the same time, the working mechanism only needs to rotate or move linearly around the axis of the equipment, and the movement is simple, the equipment cost is low, and the efficiency is high; at the same time, the rolling method provided by the present invention effectively reduces and reduces the time and cost of forming the internal bevel gear ring, improves the forming quality, and has the advantages of high production efficiency, small equipment tonnage, and the ability to form large tooth heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0023] Figure 2 It is a schematic structural diagram of a mold unit in the first embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the lower pushing device in the first embodiment of the present invention.

[0025] Description of main reference numerals 1. Mold unit, 11. Forming part, 12. Finishing part, 2. Blank part, 3. Lower mold base, 4. Driving gear, 5. Lower pushing device, 51. Pushing ring, 52. Lower pushing driving part. DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0027] Embodiment 1 like Figure 1 As shown, a multi-die rolling die for an internal helical gear ring includes a lower die assembly and an upper die assembly: The lower die assembly includes a lower die base 3, a lower push device and a rotation drive device. The lower die base 3 is cylindrical, and its inner cavity is used to place the blank 2. Figure 3As shown in the figure, the lower pushing device includes a pushing ring 51 and a lower pushing driving member 52. The lower pushing driving member 52 can be telescoped in the vertical direction, and the telescoping end faces upward. The pushing ring 51 is arranged on the telescoping end of the lower pushing driving member 52. The outer diameter of the pushing ring 51 is adapted to the inner diameter of the cylinder of the lower die base, and the two are in a relatively slidable contact relationship. The rotation driving device includes a driving gear 4. A toothed ring portion is provided on the outer peripheral surface of the lower die base 3. The driving gear 4 meshes with the toothed ring portion, and the driving gear 4 is also connected to a driving member such as a motor.

[0028] The upper die assembly includes a plurality of die monomers 1 and an upper pushing device. The upper pushing device can be telescoped in the vertical direction and the telescoping end faces downward. The die monomers 1 are all installed at the bottom of the lifting end of the upper pushing device. The plurality of die monomers 1 are evenly distributed circumferentially around the rotation center of the lower die base 3. The die monomer 1 is cylindrical and the outer peripheral surface is evenly provided with bevel-cut teeth (it can be understood that the die monomer is a structure similar to a gear). Further, as Figure 2 shown, the bevel-cut teeth include a forming portion 11 and a finishing portion 12. The finishing portion is located below the forming portion. The main function of the forming portion 11 is the extrusion rolling forming of the tooth height of the internal bevel gear ring. The pitch circle of the finishing portion 12 is tangent to the root circle of the internal bevel gear ring part. The main function of the finishing portion 12 is the correction and finishing of the formed bevel teeth. The tooth top of the forming portion 11 is a bevel surface and is inclined 3-15° towards the center direction of the die monomer relative to the tooth top of the finishing portion 12. The size of the die monomer 1 is determined according to the size of the internal bevel gear ring part to be formed. Let the outer diameter of the die monomer 1 be Rb2, the pitch circle radius be R2, the height be Hd2, the center distance between the die monomer 1 and the blank part be a1, and the root circle radius of the formed internal bevel gear ring part be Rf. Then there is a1 = Rf - Rb2.

[0029] Let the height of the lower die base 3 be Hd1, the inner diameter be Rd1, the length of the mating part of the pushing ring located in the lower die base 3 be L1, the height of the blank part 2 be Hb, and the outer diameter be Rb1. It satisfies the formula: Hb < Hd1 - L1; Rd1 = Rb1 - ε, where ε is the selected interference amount.

[0030] In this embodiment, three die monomers are provided, which are arranged at intervals of 120 degrees. The number of teeth of the die monomer 1 is Zd, and the number of teeth of the formed internal bevel gear ring is Zp. The phase adjustment angle of the i-th extrusion die relative to the first extrusion die is , satisfying the formula: , where i = 1, 2, 3; That is, the three die monomers D1, D2, and D3 are arranged clockwise. The specific phase adjustment angles are as follows: The phase adjustment direction of the first die monomer D1 is clockwise, and the adjustment angle is ; The phase adjustment direction of the second die monomer D2 is clockwise, and the adjustment angle is: ; The phase adjustment direction of the third mold unit D3 is clockwise, and the adjustment angle is: .

[0031] Embodiment 2 Based on the rolling die provided in the first embodiment, this embodiment further provides a multi-die extrusion rolling method for an inner helical gear ring, comprising the following steps: S1. Place the blank into the accommodating cavity of the lower die base, place the blank concentrically with the accommodating cavity and the blank is not higher than the upper end surface of the lower die base, and the lower end surface of the blank contacts the pushing end of the lower pushing device; S2. Compound feed extrusion rolling forming, the die unit moves downward at a speed v1, and the lower die base drives the blank to rotate clockwise at an angular velocity ω1 until two-thirds of the trimming portion of the die unit is out of the lower end surface of the blank, satisfying the formula:

[0032] Where: β is the helix angle of the helical gear ring; S3. The mold is withdrawn, and the mold body moves upward at a speed v2. The lower mold base drives the blank to rotate counterclockwise at an angular velocity ω2 until the mold body returns to the initial position, satisfying the formula:

[0033] S4. The incremental forming area is transferred, and the lower die base drives the blank to rotate clockwise through an angle α, satisfying the formula:

[0034] S5. Repeat steps S2-S4 until a complete internal helical gear ring part is processed; S6. The mold unit is fully raised, so that the distance H between the lower end surface of the mold unit and the upper end surface of the lower mold base is greater than the height Hb of the blank. The lower pushing device moves upward to push the formed internal bevel gear ring part out from the top of the lower mold base to complete the unloading.

[0035] Furthermore, it can be known from the description of Example 1 that the lower die base is driven to rotate by the driving gear, so the clearance elimination step can be performed before the first step S2 is performed: the center distance and side clearance between the driving gear 4 and the lower die base 3 are adjusted, and the driving gear 4 and the gear ring part of the lower die base 3 are meshed; according to the rotation direction of the lower die base 3 during the extrusion rolling tooth shape, the contact position of the two meshing teeth of the driving gear 4 and the gear ring part is adjusted to achieve synchronous rotation of the lower die base 3 and the driving gear 4, thereby eliminating the phenomenon of inaccurate rotation control caused by the existence of side clearance.

[0036] It can be seen from the above embodiments that the beneficial effects of the present invention are that, compared with the prior art, the present invention has a simple and compact structure, and multiple molds are partially formed in a single pass, so the tonnage required for the forming equipment can be greatly reduced; when the extrusion rolling forming equipment of the present invention is working, at the same time, the working mechanism only needs to rotate or move linearly around the axis of the equipment, and the movement is simple, the equipment cost is low, and the efficiency is high; at the same time, the rolling method provided by the present invention effectively reduces and reduces the time and cost of forming the internal bevel gear ring, improves the forming quality, and has the advantages of high production efficiency, small equipment tonnage, and the ability to form large tooth heights.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-die rolling die for an internal helical gear ring, characterized in that: It includes a lower mold assembly and an upper mold assembly. The lower mold assembly includes a lower mold base and a lower pushing device. The lower mold base is cylindrical and is connected to a rotating drive device. The pushing end of the lower pushing device is located at the lower part of the cylindrical inner cavity. The upper mold assembly includes a plurality of mold monomers. The plurality of mold monomers are evenly distributed along the circumferential direction with the rotation center of the lower mold base as the axis. The mold monomers are cylindrical and the outer circumferential surface is evenly provided with bevel teeth [Wen Yue 1].

2. The inner bevel gear ring multi-die rolling die according to claim 1, characterized in that: The upper mold assembly also includes an upper pushing device, and multiple mold monomers are installed on the lifting end of the upper pushing device [Wen Yue 2].

3. The multi-die rolling die for the internal helical gear ring according to claim 2, characterized in that: The lower pushing device includes a pushing ring and a lower pushing driving member. The pushing ring is located in the cylindrical inner cavity of the lower mold base, and the outer periphery of the pushing ring is in slidable contact with the inner wall of the lower mold base [Wen Yue 3].

4. The inner helical gear ring multi-die rolling die according to claim 3, characterized in that: The rotation driving device includes a driving gear, and the outer peripheral surface of the lower mold base is provided with a gear ring portion, the driving gear is meshed with the gear ring portion, and the driving gear is also connected to a driving member [Wen Yue 4].

5. The multi-die rolling die for the internal helical gear ring according to claim 4, characterized in that: The mold units are provided in three numbers and are arranged at intervals of 120 degrees from each other.

6. The multi-die rolling die for the internal helical gear ring according to claim 5, characterized in that: The beveled teeth on the outer periphery of the mold unit include a forming part and a trimming part. The trimming part is located below the forming part. The tooth top circle of the trimming part is tangent to the tooth root circle of the internal bevel gear ring part. The tooth top of the forming part is an inclined surface and is inclined toward the center of the mold unit relative to the tooth top of the trimming part [Wen Yue 5].

7. The multi-die rolling die for the internal helical gear ring according to claim 6, characterized in that: The tooth top inclination angle of the forming part relative to the tooth top of the trimming part is 3-15°, the outer diameter of the mold unit is Rb2, the pitch circle radius is R2, the height is Hd2, the center distance between the mold unit 1 and the blank is a1, and the root circle radius of the formed internal helical gear ring part is Rf, a1=Rf- Rb2.

8. The multi-die rolling die for the internal helical gear ring according to claim 7, characterized in that: The height of the lower die base 3 is Hd1, the inner diameter is Rd1, the length of the matching part of the push ring located in the lower die base 3 is L1, the height of the blank is Hb, the outer diameter is Rb1, and the formula is satisfied: Hb <Hd1-L1; Rd1= Rb1-ε; Where ε is the interference.

9. The multi-die rolling die for the internal helical gear ring according to claim 8, characterized in that: The number of teeth of the die unit 1 is Zd, the number of teeth of the formed internal helical gear ring is Zp, and the phase adjustment angle of the i-th extrusion die relative to the first extrusion die is , and satisfy the formula: Where i=1, 2, 3[Wen Yue 6].

10. A multi-die extrusion rolling method for an internal helical gear ring, characterized in that: The following steps are included [Wenyue 7]: S1. Place the blank into the accommodating cavity of the lower die base, place the blank concentrically with the accommodating cavity and the blank is not higher than the upper end surface of the lower die base, and the lower end surface of the blank contacts the pushing end of the lower pushing device; S2. Compound feed extrusion rolling forming, the die unit moves downward at a speed v1, and the lower die base drives the blank to rotate clockwise at an angular velocity ω1 until two-thirds of the trimming portion of the die unit is out of the lower end surface of the blank, satisfying the formula: Where: β is the helix angle of the helical gear ring; S3. The mold is withdrawn, and the mold body moves upward at a speed v2. The lower mold base drives the blank to rotate counterclockwise at an angular velocity ω2 until the mold body returns to the initial position, satisfying the formula: S4. The incremental forming area is transferred, and the lower die base drives the blank to rotate clockwise through an angle α, satisfying the formula: S5. Repeat steps S2-S4 until a complete internal helical gear ring part is processed; S6. The mold unit is fully raised, so that the distance H between the lower end surface of the mold unit and the upper end surface of the lower mold base is greater than the height Hb of the blank. The lower pushing device moves upward to push the formed internal bevel gear ring part out from the top of the lower mold base to complete the unloading.

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