An electric heating sealing push head and metal forming process

Abstract

The invention relates to the technical field of internal high pressure forming, and provides an electric heating type sealing push head, which includes a sealing part and a pushing part; the sealing part has a mandrel that can reciprocate in the axial direction, and a A number of clamping blocks that reciprocate in the radial direction; the mandrel and the clamping block are respectively equipped with an inner chuck and an outer chuck; the mandrel is also provided with a through hole for the passage of the pressure medium; the inner chuck and the mandrel All are conductive materials, and the mandrel is connected to the conductive plate. Thereby, the present invention realizes the sealing of the tube blank by means of clamping. The precision requirement of the tube blank port is reduced, and the processing difficulty and cost are reduced. The sealed push head also has electric heating function. The invention also provides a metal forming process using the sealed push head, in which the tube blank is heated to the thermal processing temperature by means of electric heating before expanding to avoid cold work hardening after expanding.

Description

technical field [0001] The invention belongs to the technical field of internal high pressure forming, and in particular relates to an electric heating sealing push head. Background technique [0002] With the trend of automobile lightweight, the internal high pressure forming process has gradually become one of the important technologies in the auto parts processing industry. [0003] At present, the push head commonly used in the internal high pressure forming process is the internal sealing method, see figure 1 , the protruding part of the push head extends into the tube blank 1 and cooperates with the inner wall of the mold 11 to clamp the tube wall of the tube blank 1, and a sealing ring 12 is set at the same time to complete the sealing. In order to ensure the sealing effect, the gap between the tube wall of the tube blank 1 and the push head should be as small as possible, so the processing accuracy of the tube diameter of the tube blank 1 port is relatively high, wh...

AI Technical Summary

Problems solved by technology

[0005] However, the thickness of the metal tube blank formed by internal high pressure is not large, and the heat storage of the blank is low;

Therefore, during bulging, the temperature of the blank is difficult to control, which reduces the stability of the forming process and the consistency of the forming quality

[0006] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

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