Pipe-expansion mold

Abstract

The invention discloses a labor-saving, fast pipe-expansion die with high extensibility, which comprise a die holder and a pipe-expansion die; the die holder comprises a die holder body and a cover plate; a guide hole and a working hole which are mutually run-through are cut at two sides of the die holder body; the pipe-expension die comprises a pyramidal core shaft, an elastic washer and a pipe-expansion body which is composed of at least two combined pipe-expansion monomers of which the inner walls cooperate with the outer wall of the core shaft, and therefore a pyramidal hole formed in the pipe-expansion body coincides with the core shaft; the elastic washer is sheathed at the bottom of the pipe-expansion body and is clasped in the working hole by the cover plate; the core shaft runs through and is arranged in the guide hole and the pyramidal hole. The pipe-expansion die is mainly used in various pipe-end forming devices.

Description

technical field [0001] The invention relates to a mold, in particular to a tube expanding mold. Background technique [0002] As we all know, for example, for pipe fittings used in pipelines of automobiles and air conditioners, the ends of the pipes must be formed through expanding or shrinking processes. In the tube expansion process, the end of the tube is processed into the desired shape by cooperating with the clamping device for clamping the tube (commonly known as the clamping die) and the tube expansion die. As shown in FIG. 1 , a commonly used pipe expanding die includes: a die base 1 and a pipe expanding die 2 arranged in the die base 1 . The working process of the pipe expanding die is as follows: firstly, the pipe fitting 4 to be processed is clamped in the clamping die 3, and then an axial thrust is applied on the mold base 1, and the thrust is directly transmitted to the expanding pipe die 2, so that the expanding pipe The pipe mold 2 and the inner wall of the...

AI Technical Summary

Problems solved by technology

[0003] 1. Sufficient axial thrust is needed to overcome the resistance in the process of moving the expanding tube mold, which makes the advancing speed of the expanding tube mold slow and reduces the efficiency of expanding the tube;

[0004] 2. During the advancing process of the expanding pipe die, the resistance of the expanding pipe die increases with the increase of its advancing depth, which determines that the above-mentioned expanding pipe die should not be too long. In order to ensure the forming length of the pipe end, it must be reduced The elongation of the pipe end is the expansion degree of the pipe end, which makes its elongation relatively low; for some pipe ends that require a higher elongation, it needs to go through the second expansion of the tube to form; and the second expansion of the tube requires the replacement of the expansion tube Die, repositioning, which will not only cause a further decline in tube expansion efficiency, but also affect the coaxiality of tube expansion

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