CN210475363U

CN210475363U - Die for internal T-shaped gear forging

Info

Publication number: CN210475363U
Application number: CN201921405257.XU
Authority: CN
Inventors: 冯磊; 汪森林; 陶科华
Original assignee: Zhangjiagang Hengtong Ring Forging Manufacturing Co Ltd
Current assignee: Zhangjiagang Hengtong Ring Forging Manufacturing Co Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-05-08
Anticipated expiration: 2029-08-27

Abstract

The utility model discloses an inner T-shaped gear forging die, which comprises a cylindrical main roller and a core roller, wherein the forging is arranged between the main roller and the core roller, the die also comprises a pair of conical rollers which are clamped on the upper side surface and the lower side surface of the forging, the core roller comprises an upper section of the core roller, core roller middle section and core roller hypomere, the core roller middle section is cylindricly, be provided with the epirelief shoulder in the core roller middle section, the lower protruding shoulder and be located the depressed part between the two, the side of depressed part is vertical face, the lower extreme downward sloping of epirelief shoulder is oblique straight face, carry out transitional coupling through first transition circular arc between the side of epirelief shoulder and its lower terminal surface, carry out transitional coupling through second transition circular arc between the lower terminal surface of epirelief shoulder and the side of depressed part, the upper end of protruding shoulder is the arc surface of evagination down, carry out transitional coupling through third transition circular arc between the upper end of protruding shoulder and the side of depressed part down. When the mold is used for production, the investment of raw materials can be reduced, and meanwhile, the mold is not easy to crack in the using process and long in service life.

Description

Die for internal T-shaped gear forging

Technical Field

The utility model relates to a production technical field of ring forging, concretely relates to interior T type gear forging mould.

Background

The gear is a common part which is frequently used in mechanical transmission, adopts high-quality high-strength alloy steel, is subjected to surface carburizing and hardening treatment, and has strong bearing capacity and durability. In practical application, the helical gear has the characteristics of stable transmission, small impact, vibration and noise and the like, so the helical gear is widely used on engineering machinery and large ship cranes.

Traditional ring gear is when producing, and ring gear ring and web separately produce alone, weld again after the machine-shaping, and it is high to its tailor-welding technical requirement, can produce stress during the welding, lead to the ring gear ring to warp, and follow-up processing finishes still must destressing the tempering, and the production process uncontrollable factor is more, leads to unqualified product more, and the mechanical properties of welding department often hardly reachs the mechanical properties of whole body, and long-time rotation atress uses the welding department can ftracture. In order to solve the problems, the core roller is improved in the patent number ZL201220171186.3 (a gear forging core roller), the groove design is adopted in the middle of the core roller, the outer side of the groove is designed into a circular arc shape to forge simultaneously, the core roller is adopted to save materials, but when the core roller is adopted to forge forgings, the metal fluidity of 42CrMo is poor, the cavity in the upper half part of the die is hardly filled, the machining allowance is insufficient, and the unqualified product is caused. How to solve the above problems is a matter that those skilled in the art have been dedicated to solve.

Disclosure of Invention

The utility model aims at overcoming prior art not enough, providing an interior T type gear forging mould, when adopting this mould production, reduced follow-up car processing's surplus, shortened car processing time, improve the qualification rate of product in the save raw materials.

In order to achieve the above purpose, the utility model adopts the technical scheme that: an inner T-shaped gear forging die comprises a cylindrical main roller and a core roller, wherein a forging is arranged between the main roller and the core roller, the die also comprises a pair of conical rollers clamped on the upper side surface and the lower side surface of the forging piece, the core roller comprises a core roller upper section, a core roller middle section and a core roller lower section, the middle section of the core roller is cylindrical, the middle section of the core roller is provided with an upper convex shoulder part, a lower convex shoulder part and a concave part positioned between the upper convex shoulder part and the lower convex shoulder part, the side surface of the concave part is a vertical surface, the lower end surface of the upper convex shoulder part is inclined downwards to form an inclined straight surface, the side surface of the upper convex shoulder part is in transition connection with the lower end surface of the upper convex shoulder part through a first transition circular arc, the lower end surface of the upper convex shoulder part is in transition connection with the side surface of the concave part through a second transition circular arc, the upper end face of the lower convex shoulder part is an arc surface which is convex outwards, and the upper end face of the lower convex shoulder part is in transition connection with the side face of the concave part through a third transition arc.

Preferably, the lower end face of the upper convex shoulder part is inclined inwards by 40-48 degrees from top to bottom, and the upper end face of the lower convex shoulder part is an arc surface with the radian of 85-95 degrees.

Preferably, the first transition circular arc and the second transition circular arc are circular arcs of R20.

Preferably said third transition arc is the arc of R20.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage: the utility model discloses an interior T type gear forging mould, it has set up epirelief shoulder, lower protruding shoulder and depressed part at the core roller middle part, through setting up the depressed part, carries out the feed supplement in advance in process of production, effectively prevents to fill the condition that appears pulling the material after being full of at the die cavity, is rolling ring extrusion in-process simultaneously, has improved the mechanical properties of this side department to a certain extent, has improved the life of product. And the lower extreme face downward slope of epirelief shoulder is oblique straight face, and the upper end of epirelief shoulder is personally submitted circular-arcly, is favorable to the mould shaping, ensures the metal flow to die cavity bottom position simultaneously in the ring forging production process, makes it fill up, has reduced the car allowance, and convenient follow-up processing has improved production efficiency, through setting up first transition circular arc, second transition circular arc, third transition circular arc, is favorable to reducing the condition that takes place the fracture in the mould use, has improved the life of mould.

Drawings

FIG. 1 is a schematic structural view of a gear forging mold according to the present invention;

FIG. 2 is a schematic structural view of a core roller in the gear forging mold according to the present invention;

wherein: 1. a main roller; 2. a core roll; 21. a core roller upper section; 22. a core roller middle section; 23. a core roller lower section; 24. a raised shoulder; 25. a lower convex shoulder; 26. a recessed portion; 27. a first transition arc; 28. a second transition arc; 29. a third transition arc; 3. forging; 4. and (4) a conical roller.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

A die for forging internal T-shaped gears comprises a cylindrical main roller 1, a core roller 2, a forging 3 arranged between the main roller 1 and the core roller 2, and a pair of conical rollers 4 clamped on the upper side surface and the lower side surface of the forging 3, as shown in figure 1.

The core roll 2 comprises a core roll upper section 21, a core roll middle section 22 and a core roll lower section 23, as shown in fig. 1 and 2. This core roller middle section 22 is cylindricly, be provided with last shoulder 24, lower shoulder 25 and be located the depressed part 26 between the two on the core roller middle section 22, the side of this depressed part 26 is vertical face, the lower extreme downward sloping of last shoulder 24 is oblique straight face, go up the side of shoulder 24 and carry out transitional coupling through first transition circular arc 27 between its lower terminal surface, carry out transitional coupling through second transition circular arc 28 between the lower terminal surface of last shoulder 24 and the side of depressed part 26, the arc surface that the upper end of lower shoulder 25 is outside protruding, carry out transitional coupling through third transition circular arc 29 between the upper end of lower shoulder 25 and the side of depressed part 26, see fig. 2.

Here, through setting up depressed part 26 for prevent to appear pulling the condition of material after the die cavity is filled fully in production process, through setting up depressed part 26, carry out the feed supplement in advance, guarantee that fashioned product leaves the car allowance to through in the ring rolling extrusion process, improved the mechanical properties of this side department to a certain extent, improved the life of product. Here, the upper and lower positions of the forging 3 are adjusted through the conical rollers 4, the upper conical roller 4 and the lower conical roller 4 are driven by the motor to move in opposite directions, and the upper conical roller 4 moves downwards within a certain time range to adjust the position of the forging 3.

Here, the lower end surface of the upper shoulder portion 24 is provided with an inclined straight surface, which has the function of facilitating the molding of the mold and ensuring that the metal flows to the bottom position of the cavity during the ring forging process, so that the cavity is filled with the metal. And the upper and lower sides of the inclined straight surface are in transition connection with the side surface of the upper convex shoulder part 24 and the side surface of the concave part 26 through a first transition arc 27 and a second transition arc 28, so that the cracking of the product in the use process is reduced, and the service life of the product is prolonged.

Here, the upper end surface of the lower shoulder 25 is configured to be an arc surface, the arc surface is configured according to the shape of the product, and in order to reduce the subsequent machining allowance, the upper end surface of the lower shoulder 25 is transited to the side surface of the recess 26 through the third transition arc 29, which is beneficial to cracking of the product in the using process, so as to improve the service life of the product.

In this example, the lower end surface of the upper shoulder 24 is inclined inward by 40 to 48 degrees from top to bottom, and the arc of the upper end arc surface of the lower shoulder 25 is 85 to 95 degrees. The angle is too large, so that the purpose of saving materials cannot be achieved, and the angle is too small, so that the metal flow is not facilitated, and the cavity cannot be filled.

Here, the first transition arc 27 and the second transition arc 28 are arcs of R20; the third transition arc 29 is the arc of R20. Through setting up first transition circular arc 27 and second transition circular arc 28, be connected the side of last boss, terminal surface down, depressed part 26, be connected the upper end face of boss and the side of depressed part 26 down through third transition circular arc 29, be favorable to reducing to take place the fracture in the use, improved the life of mould.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. An inner T-shaped gear forging die comprises a cylindrical main roller, a core roller, a pair of conical rollers clamped on the upper side surface and the lower side surface of a forging, wherein the forging is arranged between the main roller and the core roller, it is characterized in that the core roller comprises a core roller upper section, a core roller middle section and a core roller lower section, the core roller middle section is cylindrical, the middle section of the core roller is provided with an upper convex shoulder part, a lower convex shoulder part and a concave part positioned between the upper convex shoulder part and the lower convex shoulder part, the side surface of the concave part is a vertical surface, the lower end surface of the upper convex shoulder part is inclined downwards to form an inclined straight surface, the side surface of the upper convex shoulder part is in transition connection with the lower end surface of the upper convex shoulder part through a first transition circular arc, the lower end surface of the upper convex shoulder part is in transition connection with the side surface of the concave part through a second transition circular arc, the upper end face of the lower convex shoulder part is an arc surface which is convex outwards, and the upper end face of the lower convex shoulder part is in transition connection with the side face of the concave part through a third transition arc.

2. The die for forging the inner T-shaped gear as claimed in claim 1, wherein the lower end face of the upper convex shoulder portion is inclined inward by 40-48 degrees from top to bottom, and the upper end face of the lower convex shoulder portion is an arc face with the radian of 85-95 degrees.

3. The internal T-shaped gear forging die of claim 1, wherein the first transition arc and the second transition arc are arcs of R20.

4. The inner T-shaped gear forging die of claim 1, wherein the third transition arc is the arc of R20.