Integral die-forging method for frogs

A technology of integral mold and frog, which is applied in the field of forging, can solve problems such as difficult blank positioning, high scrap rate, non-conformity to requirements, etc., achieve axial machining accuracy and high material utilization, reduce operation accuracy requirements, and avoid intermediate The effect of step flashing

Active Publication Date: 2018-08-03
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If the free forging + machining process line is used, at least ten sets of lower anvils are required, which greatly prolongs the processing time and increases the number of heating times. At the same time, because precise forming cannot be achieved, additional dressing and additional processing allowance are required. The utilization rate is lower than 50%, and the blanking is at least 3 tons; and a large amount of dressing at the center of the fork will eventually be removed by subsequent machining, and subsequent machining will cut off the metal streamline formed by free forging, thus reducing the overall performance of the forging , and this part bears the severe impact of the wheel, which has high performance requirements, and the excessive cutting amount of machining may make the final frog forging not meet the requirements; in addition, the frog is more sensitive to the axial precision, and the axial precision in the free forging process It is difficult to control the amount of elongation in the direction, and the process stability is not high, which will eventually lead to a high scrap rate
[0007] If this type of frog is formed by die forging, the following problems will be introduced: the final forming tonnage is huge, and the mold clamping

Method used

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  • Integral die-forging method for frogs
  • Integral die-forging method for frogs
  • Integral die-forging method for frogs

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Embodiment 1

[0041] The embodiment of the present invention adopts the integral die forging method of the super-long variable cross-section long-shaft forging provided by the present invention to produce a certain type of frog hot forging. The frog hot forging contains a flash structure, and its specific structure is as follows figure 2 As shown, it is mainly used for the intersection and reversing positions of heavy-duty railway lines.

[0042] and figure 1 The frog hot forging shown without the flash structure is similar. This type of frog hot forging is composed of wing rails 1 on both sides, fork center 2 at the center, and fork heel rail 3 extended from the fork center 2. The overall It is connected and fixed by the outermost pressure plate 4, and the two ribs arranged in the middle of the frog are removed from the forging. The total length of the frog is about 6 meters, the maximum width is about 450 mm, the maximum height is about 180 mm, and the total weight is less than 1.5 tons....

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Abstract

The invention discloses an integral die-forging method for frogs. The integral die-forging method comprises the steps of cogging, pre-forging and finish-forging, wherein during the cogging, original blanks heated to reach an initial forging temperature are pre-allocated in the axial direction through cross wedge rolling to obtain blanks; during the pre-forging, the blanks heated to reach the initial forging temperature are prefabricated through die-forging to obtain prefabricated blanks; and during the finish-forging, the prefabricated blanks heated to reach the initial forging temperature areforged through the die-forging to obtain the frogs. According to the method disclosed by the invention, formation is realized in the manner of cross wedge rolling cogging, die-forging pre-forging anddie-forging finish-forging, and after the cross wedge rolling cogging and the die-forging pre-forging, the form of the mass distribution of the prefabricated blanks is gradually converted to the formsimilar to the finish-forged pieces, of a plurality of the prefabricated blanks at the two ends and a few of the prefabricated blanks at the middle in the axial direction, and a plurality of the prefabricated blanks at the two sides and a few of the prefabricated blanks at the middle in the section direction, from the uniform-section form of the original round-rod-shaped blanks; the tendency of slip of the blanks due to instability during the pre-forging is reduced through the matching of the columnar characteristic of the blanks and the guide characteristic of the pre-forged die cavities; and the integral die-forging method is high in axial machining accuracy and material utilization rate, stable in process, and capable of realizing integral die-forging for the frogs under a low tonnage.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to an integral die forging method for a frog. Background technique [0002] Long-shaft forgings with variable cross-section usually have the characteristics of large aspect ratio, complex shape in the middle and both ends. In practical applications, long-shaft forgings with variable cross-section usually need to bear alternating loads such as compression, tension, and bending. The quality puts forward higher requirements. In particular, super-long variable-section long-shaft forgings such as frog parts used on railways can reach more than 6 meters in length, and the cross-sectional shape along the axial direction changes complicatedly. At present, casting processes are generally used in mass production. [0003] However, with the continuous improvement of national requirements for the quality of heavy-duty railway lines, the performance of cast frogs can no longer fully meet the re...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21K7/02
Inventor 吴任东袁朝龙姜艺林焦玮黄佳杰周洁陈福强魏玮
Owner TSINGHUA UNIV
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