Extrusion forming mould of clamping jaw of drill chuck

Abstract

The invention discloses an extrusion forming mould of a clamping jaw of a drill chuck, comprising an upper concave mould and a lower concave mould, wherein the lower concave mould is matched with the upper concave mould; cavities inside the upper concave mould and the lower concave mould correspond to the clamping jaw in the shape and the size and are symmetric left and right; the parting surfaces of the upper concave mould and the lower concave mould are both formed in such a way that a horizontal plane is intersected with an inclined plane; the horizontal planes are coincided with axial lines of the cavities; the axial lines of the cavities are perpendicular to intersected lines of the horizontal planes and the inclined planes; and the inclined planes of the upper concave mould and the lower concave mould are coplanar with two arris inside the cavities, which correspond to the clamping jaw. The extrusion forming mould has the advantages of small quantity of the moulds, simple structure and smooth demoulding; and in addition, by adopting the invention, the cost is reduced, and the quality of products is further enhanced.

Description

technical field [0001] The invention relates to an extrusion molding die, in particular to a jaw extrusion molding die of a drill chuck. Background technique [0002] The jaws are a critical component in a drill chuck. Nowadays, the processing of drill chuck jaws requires multiple steps of lathes, grinders and milling machines to prefabricate the threaded addendum arc stage, occlusal slope and two jaw surfaces. In mass production, especially in the case of mass production, using the above-mentioned production process to shape the blank will cut off and grind away a lot of metal materials, resulting in a large waste of raw materials. At the same time, this processing method has many procedures, which not only increases the labor intensity, but also greatly reduces the production efficiency. Especially in order to ensure that the jaws can reliably hold the tool handle, the machining accuracy of the occlusal ridges of the jaws is required to be high, otherwise the entire prod...

AI Technical Summary

Problems solved by technology

The mold used in this multi-pass extrusion forming method requires the jaw blank to enter and exit the mold cavity along the axis of the part, and it is impossible to complete the extrusion of the prefabricated thread crest arc stage and the "tool occlusal part" on the jaw blank at one time. For press forming, more extrusion passes and more molds are required to complete the prefabricated thread crest arc stage on the jaw blank

Each pass of extrusion hardening will cause the deformation resistance of the material to increase and the plasticity to decrease, and the quality of the processed product will decrease.

Moreover, multi-pass extrusion requires multiple sets of molds, multi-station presses or multiple single-station presses. Building such a production line not only requires a large investment and high production costs, but also the product quality is difficult to be guaranteed.

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