Methods for superplastic forming

Abstract

The invention discloses a superplastic forming mold and a superplastic forming method. The superplastic forming mold comprises an upper mold and a lower mold. A pre-forming cavity with a punch is formed in the upper mold and is used for pre-forming. A forming cavity recessed inwardly is formed in the lower mold. The forming cavity corresponds to the pre-forming cavity, so that a sealed space is formed by the forming cavity and the pre-forming cavity when the lower mold and the upper mold are closed. The upper mold and the lower mold are respectively provided with an upper air inlet and a lower air inlet. Both the upper air inlet and the lower air inlet are communicated with the sealed space. By the aid of the superplastic forming mold, both punch forming and superplastic forming can be performed on one mold, the three steps including punch forming, pre-forming and forming can be finished on the same mold, advantages of two technologies are creatively combined, defects of the two technologies are mutually counteracted, quick forming can be realized, thickness of products can be effectively controlled, and requirements, on superplasticity of raw materials, from superplastic forming are reduced.

Description

Technical field [0001] The present invention relates to the field of manufacturing technology, in particular to a mold and method for superplastic forming. Background technique [0002] Superplastic molding technology, especially superplastic inflatable molding technology is a relatively new, advanced and immature technology. It has the advantages of good performance, high precision, simple process, convenient operation, etc. It saves energy while ensuring product quality. And equipment, but the existing superplastic forming technology has two major shortcomings. One problem is that the forming speed is relatively slow, which is generally several to tens of times slower than the traditional process. It requires a lot of equipment to cope with large or even huge production. Therefore, the market positioning of superplastic forming is generally set at low- and medium-volume products, and is positioned at mid-to-high-end products that pursue details. Another problem is that the thic...

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Problems solved by technology

[0002] Superplastic molding technology, especially superplastic inflation molding technology is a relatively new, advanced and immature technology, which has the advantages of good performance, high precision, simple process, convenient operation, etc., and saves energy while ensuring product quality and equipment, but the existing superplastic forming technology has two major shortcomings. One problem is that the forming speed is relatively slow, generally several to dozens of times slower than the traditional process, and a lot of equipment is required to cope with large or even huge production Therefore, the market positioning of superplastic forming is generally set on low-to-medium output products, and is positioned on mid-to-high-end products that pursue details; another problem is that the thickness of formed products is inconsistent, especially for products with complex structures. easy to break

Uneven thickness will cause two problems: 1. It affects the mechanical properties of the formed product; 2. It affects the yield of the product, wastes raw materials, and leads to increased manufacturing costs

Due to the special benefits of superplastic forming and the lack of effective processing methods for box-shaped metal products in the industry, the market demand for superplastic box-shaped products is increasing. Most of them are used for shells, but the thickness is uneven. And the slow production speed will greatly reduce its feasibility. What's more paradoxical is that conventional stamping can't achieve the effect of pre-stretching the thicker part of the complex formed product, and even stretch the thinner part thinner, which is not conducive to the formed product The performance of the product even makes the product break when it is inflated

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