Sedan B-post high-strength plate cold stretching-forming die and technique

Abstract

The invention relates to a die and a process for cold stretch forming of a B-column high-strength plate of a sedan, belongs to forming processing technology of metallic materials, and aims to effectively solve the technical problem of resilience of the high-strength steel plate during precision forming manufacturing. The die mainly comprises a concave die (3), a convex die (7) and a blank holder (5), wherein the concave die (3) and the convex die (7) are fixed on an upper die holder (4) and a lower die holder (8) respectively; a TD coating is fused on the concave die (3); and the bottom of the blank holder (5) is supported by a nitrogen spring (6) which is arranged on the lower die holder (8) and slidably matched with the convex die (7). The process comprises the following steps: a) blanking of technical chips; b) pre-forming of a product; c) realization of R-angle forming through reverse stretching of a workpiece in the pre-forming state; d) edging and punching of the workpiece after reverse stretching; and e) R-angle and surface reshaping of the workpiece after edging and punching.

Description

technical field [0001] The invention belongs to metal material molding processing technology, and relates to metal materials, automobile manufacturing, machinery manufacturing, metal material precision plastic molding and other disciplines. Background technique [0002] Lightweight, energy saving, environmental protection and safety are important development directions of today's automotive technology. Materials and related application technologies are the important content and material basis of technological innovation in the automotive industry. The application of lightweight materials and related application technologies in automobiles is one of the most effective measures to reduce automobile emissions and improve fuel economy. High-strength steel plate has comprehensive advantages such as high strength, good formability, high energy absorption rate, high initial work hardening rate and good anti-crash performance, and has rapidly developed into one of the most promisin...

AI Technical Summary

Problems solved by technology

The disadvantages of sheet metal hot stamping are: the forming process is complicated, the work efficiency is low, and the cost is high. It needs expensive special equipment to heat the sheet through high temperature, medium circulation and cooling, and it can be formed through complex and difficult-to-maintain tooling. , which greatly increases energy consumption, wastes resources, and forms a certain source of pollution

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