Warm forming method for metal sheet material

Abstract

The invention relates to a warm forming method for a metal sheet material. The warm forming method is characterized by comprising the following steps: the metal sheet material is arranged on a female mold, a blank pressing ring is arranged on the metal sheet material, and a part, which is opposite to a molding cavity of the female mold, of the blank pressing ring is made into a cylindrical structure which serves as a feeding cylinder; heating elements (e.g. heating rods) are arranged inside the blank pressing ring and the female mold so as to heat the sheet material, and meanwhile, temperature sensors are mounted inside the blank pressing ring and the female mold; a solid granular medium is added from the feeding cylinder of the blank pressing ring, and a compressing head is arranged above the solid granular medium; and when the difference in temperature of a flange part and a center position of the metal sheet material is stable, a blank pressing force is applied to the blank pressing ring, meanwhile, the compressing head descends to compress the solid granular medium so as to apply a compressing force to the metal sheet material, and the metal sheet material is then formed. The warm forming method for the metal sheet material has the advantages that the forming property of the metal sheet material can be effectively improved, the mold structure is simple, and the forming quality of parts is good. Compared with the hydraulic forming method, the warm forming method disclosed by the invention has the advantages that the sealing is not required, no pollution exists, and the solid granular medium can be recycled, thus the requirements for low carbon and environmental protection are met.

Description

technical field [0001] The invention relates to metal sheet forming technology in the mechanical field, in particular to a method for deep drawing and forming of metal sheets in a warm environment, and is especially suitable for forming light alloy or high-strength alloy sheets that are difficult to deform at normal temperatures. Background technique [0002] Many metal sheets are difficult to form at room temperature, such as magnesium alloy, aluminum alloy, titanium alloy and other metals. These metals have poor formability due to low plasticity at room temperature. However, experiments have shown that its formability can be greatly improved at a certain processing temperature. Therefore, warm forming, which can effectively improve the formability of materials that are difficult to deform at room temperature, has been widely used. [0003] At present, there are generally isothermal forming and non-isothermal forming in sheet metal thermoforming. A large number of experime...

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Problems solved by technology

Patent 200520088992.4 discloses a mold tooling for warm hydroforming of magnesium alloy sheets. The mold can realize the composite forming process of warm hydraulic deep drawing, and a large amount of deformation can be realized in one forming process; it can also realize the composite forming process of warm hydraulic bulging However, liquid sealing is difficult in this process, and for high temperature forming, the forming temperature is limited by the limit temperature of the liquid, so it is not suitable for sheet forming with a temperature higher than 400 °C

The patent application specifications with application numbers 200610117578.0 and 200610155912.1 respectively disclose two different non-isothermal drawing dies for magnesium alloys. The formability of alloy sheets; they all use rigid dies in deep drawing, so that further drawing of the sheet is inhibited

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