Plastic forming method of draw-hole bolt

Abstract

The invention provides a plastic forming method of a draw-hole bolt and belongs to part cold heading methods. The plastic forming method comprises the steps that firstly, the tail taper and required dimension of a rod part are obtained by squeezing a part blank through a first stamping die (1); secondly, a bottom hole and the required dimension of the rod part are obtained by squeezing the part (2) in the first step through a second stamping die (3); thirdly, the head taper and the required dimension of upsetting depth and pumping depth of the rod part are obtained by squeezing the part (2) in the second step through a third stamping die (4); fourthly, the required dimension for flattening the head portion, drawing down the rod part and further hole drawing is obtained by squeezing the part (2) machined in the third step through a fourth stamping die (5); and fifthly, the head shape is obtained by squeezing the part (2) machined in the fourth step through a fifth stamping die (6). The plastic forming method of the draw-hole bolt has the advantages that the bottom hole is squeezed effectively, the procedures are simple, machining is convenient, the material utilization rate is high, and the service life of the dies is long.

Description

technical field [0001] The invention belongs to the technical field of part processing technology, and in particular relates to a part cold heading processing method for effectively drawing bottom holes. Background technique [0002] Chinese patent application No. 201110341854.2 discloses a cold heading forming process for titanium alloy fasteners, which is to first select the titanium material in the coil annealed state with a Brinell hardness less than 100, and use a small pass process during drawing, that is, anneal each time The final deformation is increased by one pass, and the processing amount of each pass is 50% of the processing amount of the previous pass; the drawn coil material is sent to a high-strength multi-station cold heading machine, and is formed by at least two cold headings Made, and the deformation of each cold heading does not exceed 50%. The application of the inventive process can improve work efficiency by 10-15 times, reduce material utilization ...

AI Technical Summary

Problems solved by technology

But its disadvantages are: the process is relatively complicated, there is still room for improvement in material utilization, the range of processed materials is small, and the product has burrs, which affect product quality. Therefore, the process still needs to be improved.

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