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Cross wedge rolling combined die of railway vehicle axle and forming method thereof

A technology of railway vehicles and combined molds, which is applied in the direction of metal rolling, cylinders, mechanical equipment, etc., can solve the problems of difficult mold manufacturing and debugging, huge equipment, and increased equipment load, so as to reduce the size and weight, and reduce the mold cost, effect of reducing mill load

Active Publication Date: 2021-12-14
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the railway vehicle axle is a super-large shaft part with a diameter greater than Φ190mm and a length greater than 2200mm. A pair of single-wedge molds are used for one-time forming. The diameter of the mold needs to be more than Φ3400mm, and the equipment is huge; Small, but the equipment load is multiples of the single wedge, making mold manufacturing and debugging very difficult
Therefore, the use of a pair of molds to form railway vehicle axles is huge and difficult to implement.

Method used

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  • Cross wedge rolling combined die of railway vehicle axle and forming method thereof
  • Cross wedge rolling combined die of railway vehicle axle and forming method thereof
  • Cross wedge rolling combined die of railway vehicle axle and forming method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a combination die for cross wedge rolling of a railway vehicle axle, such as Figure 3-6 As shown, the molds include: the first pair is a universal mold for cross-wedge rolling axle body, which is used to roll and form part of the axle body of the axle, and this mold can be shared by different axles; the second pair is a special mold for cross-wedge rolling axle step forming , used to roll the stepped shape of the axle and the rest of the two sides to ensure the axial dimensional accuracy of the axle. The mold blocks are distributed along the forming wedge, and the second auxiliary mold adopts the middle positioning key to offset the axial force. The forming method realizes the forming of the axle bodies with different diameters by adjusting the center distance of the mold on the general mold of the first auxiliary cross wedge rolling axle body; Dies with different axle step pass types roll and form the axle steps and the rest of the two sides,...

Embodiment 2

[0055] A kind of cross-wedge rolling combined mold of railway vehicle axle and its forming method of the present embodiment are basically the same as embodiment 1, only difference is:

[0056] In this embodiment, according to the above-mentioned combined cross-wedge rolling mold and forming method for railway vehicle axles, the diameter D0 of the original rolled piece is Φ212mm, and the dimensions of the formed axle: the total length L0 is 2161mm, the shaft length L1 is 1155mm, and the diameter D1 is Φ182mm , the wheel seat length L2 is 202mm, the shaft diameter length L3 is 187mm, and the diameter D2 is Φ142mm. The common mold for the shaft body is shared with Example 1, and the forming angle α2 of the outer step shaft section of the special mold for step forming is 27°, and the widening angle β2 angle is 8°. The rolling diameter D1 of the common die for the shaft body is Φ182mm, the rolling length M1 is 990mm, and the rolling length of the special die for step forming 2×M2 i...

Embodiment 3

[0058] A kind of cross-wedge rolling combined mold of railway vehicle axle and its forming method of the present embodiment are basically the same as embodiment 1, only difference is:

[0059] In this embodiment, according to the above-mentioned combined cross-wedge rolling mold and forming method for railway vehicle axles, the diameter D0 of the original rolled piece is Φ248mm, and the dimensions of the formed axle: the total length L0 is 2229mm, the shaft length L1 is 1145mm, and the diameter D1 is Φ208mm , the wheel seat length L2 is 196mm, the shaft diameter length L3 is 186mm, and the diameter D2 is Φ172mm. The common mold for the shaft body is shared with that of Example 1. The forming α2 angle of the outer step axis section of the special mold for step forming is 42°, and the widening angle β2 angle is 11.5°. The rolling diameter D1 of the common die for the shaft body is Φ208mm, the rolling length M1 is 990mm, and the rolling length of the special die for step forming...

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Abstract

The invention belongs to the technical field of metal plastic forming, and particularly relates to a cross wedge rolling combined die of a railway vehicle axle and a forming method thereof. The cross wedge rolling combined die of the railway vehicle axle comprises an axle body universal die and a step forming special die, wherein the axle body universal die is used for rolling and forming an axle body part of an axle, and different axles can share the axle body universal die; and die hole patterns are determined according to different axle step shapes and sizes, the step forming special die is used for rolling and forming the step shapes of the axles and the rest parts on the two sides, and the axle body universal die and the step forming special die are combined to roll and form the whole railway vehicle axle. According to the forming method of the cross wedge rolling combined die of the railway vehicle axle, the size and weight of the cross wedge rolling die and the rolling mill are greatly reduced, the rolling mill load is reduced, and the die cost is remarkably reduced. The cross wedge rolling combined die of the railway vehicle axle is suitable for realizing the forming problem of the cross wedge rolling railway vehicle axle.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a combined cross-wedge rolling die for a railway vehicle axle and a forming method thereof. Background technique [0002] Axles are key components of railway vehicles. With the continuous increase of the scale of railway network construction, the market demand for axles is very large. Cross wedge rolling is a green and advanced near-net shape technology, which has been widely used in forming shaft parts. As a large-volume shaft part, the railway vehicle axle is produced by cross-wedge rolling near net shape technology. Compared with the original forging, it has the advantages of high efficiency, material saving and environmental friendliness. However, the railway vehicle axle is a super-large shaft part with a diameter greater than Φ190mm and a length greater than 2200mm. A pair of single-wedge molds are used for one-time forming. The diameter of the mo...

Claims

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Application Information

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IPC IPC(8): B21H1/22B21H1/18
CPCB21H1/22B21H1/18
Inventor 杨翠苹王宝雨李树林徐俊生刘晋平郑振华周靖
Owner UNIV OF SCI & TECH BEIJING