Cold extrusion die for double end pipe joint

Abstract

The invention discloses a cold extrusion die for a double end pipe joint. The cold extrusion die comprises an upper die fixing plate, a lower die fixing plate, an upper die sleeve, a middle die sleeve, a lower die sleeve and upper die guide pillars, wherein an inner bore of the middle die sleeve is in a twelve angle plum flower shape, and ejection devices are arranged between the lower die fixingplate and the lower die sleeve, and between the middle die sleeve and the upper die sleeve. The cold extrusion die also comprises support plates fixed on a left side and a right side of the upper diefixing plate, wherein the support plates are also located on a left side and a right side of the upper die sleeve, the middle die sleeve, the lower die sleeve and the lower die fixing plate, and are flexibly connected with the upper die sleeve and the middle die sleeve. The cold extrusion die for double end pipe joint of the present invention can be applied to manufacture of double end pipe jointin a twelve angle plum flower shape, and has advantages of decreased production costs and easy demoulding.

Description

technical field [0001] The invention relates to a cold extrusion die, in particular to a cold extrusion die for a double-ended pipe joint. Background technique [0002] At present, in the manufacture of double-ended pipe joint products with outer wires, the double-ended pipe joint is generally used to form a casting mold to form a blank first, and then the cast blank is finished with a machine tool, and finally the finished work is finished with a die sleeve or a lathe. The double-headed pipe joints are processed with external threads. Adopt above technology to have following defective: [0003] 1) The surface of the product produced by the casting mold is rough, and there are defects such as blisters, pores, burrs, cracks, etc., which cannot meet the precision requirements and affect the quality of the product; [0004] 2) When using a machine tool to finish the cast double-head pipe joint blank, due to the need to cut off the excess metal material and rough surface of th...

AI Technical Summary

Problems solved by technology

[0003] 1) The surface of the product produced by the casting mold is rough, and there are defects such as blisters, pores, burrs, cracks, etc., which cannot meet the precision requirements and affect the quality of the product;

[0004]2) When using a machine tool to finish the double-head pipe joint blank after casting, due to the need to cut off the excess metal material and rough surface of the double-head pipe joint blank, The amount of cutting is large, resulting in waste of materials and increasing the production cost of manufacturing double-ended pipe joints

[0006]The disadvantage of this cold extrusion die is: when demoulding, the upper and middle mold sets must be removed in order to make the extruded product protrude from the bottom. Take it out from the mold; for the next extrusion, put the semi-finished product to be processed into the lower punch, and then install the middle mold sleeve and the upper mold sleeve in sequence, and then perform the next extrusion

During the production process of this mold, the upper and middle mold sleeves are installed and removed many times, which is time-consuming and labor-intensive, which increases the labor cost, and even the demoulding of the product cannot be completed.

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