Method for forming pipe fittings by cold extrusion

Abstract

The invention discloses a method for cold compressing molding tube fittings, which comprises: first, plating surface coats on inner and outer surface of needed tube, to attain a half-finished product whose thickness is uniform and the size meets demand; surface treating the half-finished product; solid solution treating the half-finished product; finishing said half-finished product, to attain the final product. The invention has high efficiency and high quality without changing the property and chemical components of former material. And it can be used in the treatment of variable tube fittings.

Description

1. Technical field [0001] The invention belongs to the field of mechanical processing, in particular to a method for processing pipe fittings by cold extrusion. 2. Background technology [0002] A large number of pipe fittings of various specifications are used in the current ships, ships, chemical industry, petroleum industry, nuclear power industry and other fields. The processing and manufacturing of these pipe fittings are mostly realized by thermal processing or rolling ball forming technology. of. Thermal processing is to heat the blank of the pipe fitting during molding, and then use a mold and a mold core to form it. The disadvantage is that the iron ions on the mold will penetrate into the pipe fittings in the range of 600-900°C during heating, which will affect the performance of the product. , low processing efficiency and energy consumption. [0003] The current processing method using rolling ball forming is as follows, see figure 1 and figure 2 : [0004]...

AI Technical Summary

Problems solved by technology

[0022] When the rolling ball forming process is used, the blank of the pipe fitting is rolled again and again with a ball. The disadvantage is that the thinning amount is more than 18%, which does not meet the international standard of 12.5%. It is necessary to use a large wall thickness. Materials to produce, high cost, waste of raw materials

Usually, the glue used as the surface coating before the pipe fittings are formed is the glue with the ratio of traditional chlorinated rubber and methylbenzene, which pollutes the pipe fittings, has poor protection performance, and will evaporate at high temperature, so the current method is labor-intensive and time-consuming. It is not easy to control or the wall thickness around the product is uneven, the processing efficiency is low, the quality cannot be guaranteed, and it is not easy to promote and apply in large quantities.

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