Punching device

Abstract

The invention discloses a punching device. The punching device comprises a pipe mold inserted into a pipe cavity of a to-be-punched pipe, a punch is arranged at a through hole formed in the pipe wallof the pipe mold, the punch does stretching and retracting movement perpendicular to the pipe core direction of the pipe mold in the through hole, the end part of the portion, located outside the pipemold, of the punch is a concave arc-shaped punching surface which is of an oval columnar shape with the long axis consistent with the direction of the pipe core of the pipe mold, the end face of theportion is a concave arc-shaped punching surface, and the curvature center line of the concave arc-shaped punching surface is perpendicular to the pipe core of the pipe mold. Under the matching actionof an oval columnar column body of the end part of the punch and the concave arc-shaped punching surface, a notch in the pipe wall of the to-be-punched pipe is oval after the to-be-punched pipe is punched, and the long axis of the oval is consistent with the direction of the pipe core of the to-be-punched pipe, so that the size of the notch in the pipe wall of the to-be-punched pipe in the circumferential direction is smaller than the size in the axial direction, and therefore it is guaranteed that the height of the edge of a hole port of a flanging hole is basically consistent after flanging, the flatness of the hole port of the flanging hole of the to-be-punched pipe is improved, and the brazing quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of stamping, in particular to a punching device for pipe fittings. Background technique [0002] The distribution pipe assembly in the air conditioning pipeline system is usually welded together with the distribution pipe and the branch pipe by means of brazing. In the prior art, punching and flanging are usually carried out from the lumen of the pipe A to be punched outward by using a punching die, such as figure 1 As shown, an external flange hole is formed on the pipe wall of the pipe A to be punched, and then the branch pipe is inserted into the flange hole for brazing. In order to ensure the insertion depth of the branch pipe, it is generally welded on the pipe wall at the insertion end of the branch pipe Limiting bumps, when plugging in, make the limiting bumps on the branch pipe abut against the edge of the flanged hole on the pipe A to be punched, thereby limiting the insertion depth of the branch p...

AI Technical Summary

Problems solved by technology

In the prior art, punching and flanging are usually carried out from the lumen of the pipe A to be punched outward by using a punching die, such as figure 1 As shown, an external flange hole is formed on the pipe wall of the pipe A to be punched, and then the branch pipe is inserted into the flange hole for brazing. In order to ensure the insertion depth of the branch pipe, it is generally welded on the pipe wall at the insertion end of the branch pipe Limiting bumps, when plugging in, make the limiting bumps on the branch pipe abut against the edge of the flanged hole on the pipe A to be punched, thereby limiting the insertion depth of the branch pipe

Since the edge of the flanged hole of the tube A to be punched is in the shape of a crescent as a whole, the depth of the limit bump on the branch pipe and the edge of the flanged hole is inconsistent, which will easily lead to the deviation between the tube core of the branch pipe and the core of the flanged hole , thus affecting the quality of brazing, making the product qualification rate lower

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