Method for extrusion molding of lead-free specially shaped copper tubes

Abstract

The invention belongs to the technical field of mechanical manufacturing, and relates to a method for extrusion molding of lead-free specially shaped copper tubes. In the method, a mixture of potassium nitrate, animal fat and calcium stearate in a ratio is used as a molding medium to mold the specially shaped copper tubes, in particular, the copper tubes of a certain size are deburred, and the mixture of the potassium nitrate, animal fat and calcium stearate is fully filled in blanks of the copper tubes to obtain the filled type copper tubes; the blanks of the copper tubes are placed in an extrusion mold, the uniform and equivalent pressure is applied onto both sides of the copper tubes by extrusion mechanics, so that the blanks of the copper tubes are processed into the specially shaped copper tube pieces; after being taken down, the workpieces are placed in hot water to thaw the potassium nitrate, and then the filling materials are removed to obtain the finished products. The method has the advantages of simple process, easy operation, no lead pollution, convenient and thorough removal of the extrusion medium of the potassium nitrate and the mixture of the potassium nitrate, the realization of recycling potassium nitrate and the mixture of the potassium nitrate and low production cost.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and relates to a method for extruding a lead-free special-shaped copper pipe. Background technique [0002] At present, special-shaped copper tubes are widely used in chemical industry, refrigeration and other industries, and are indispensable parts in the connection of copper tubes. With the improvement of environmental protection regulations in various countries around the world, the heavy metals (including metal lead) in the components of household appliances exported to the EU and other regions and countries must be controlled within the allowable range. However, the processing and forming of special-shaped copper tubes in China has been using the lead filling extrusion method for a long time. The biggest defect of this process is that the process of removing residual lead in copper tubes is complicated, long cycle, and high cost to ensure that the lead content is up to stand...

AI Technical Summary

Problems solved by technology

However, the processing and forming of special-shaped copper pipes in China has been using the lead filling extrusion method for a long time. The biggest defect of this process is that the process of removing residual lead in copper pipes is complicated, long-term, and high-cost in order to ensure that the lead content is up to standard, which is very common. The residual lead content of special-shaped copper pipes produced by this process exceeds the standard

In addition, in the process of cleaning up the residual lead, the surrounding environment will be polluted, and it will directly affect the physical and mental health of the operating workers.

Images