Device and method for thermoforming gradient materials

Abstract

The invention discloses a device and method for thermoforming gradient materials. An upper mold base and a lower mold base are connected through a supporting post. A lower ejector rod and the lower mold base form sliding fit through a guide post hole in the center of the lower mold base and a slope. The upper surface of the lower ejector rod and the upper surface of the lower mold base are located in a same plane. A plurality of molds which are same in structure are stacked up and down and installed into gradient mold molds, and the molds are fixed on the lower mold base. Every two adjacent molds are isolated by asbestos gaskets respectively. The lower end of an upper punch and the center holes of the molds are coaxially installed to form sliding fit. The lower end of an upper mold connecting rod stretches into the position between the upper mold base and the lower mold base and is connected with the upper end of the upper mold punch. The upper end of the upper mold connecting rod stretches out of the upper mold base. By the adoption of the mode that the molds are installed in a gradient mode, so that powder materials which need to be located in different temperature intervals can be heated in the gradient mode; stable axial temperature gradients can be generated by heating rods and thermocouples, wherein the heating rods and the thermocouples are evenly distributed. By the adoption of the lower ejector rod, demolding can be rapidly conducted, and therefore production efficiency is improved.

Description

Technical field [0001] The invention relates to a device and a method for forming metal powder, in particular to a device and a forming method for hot-press forming gradient materials with automatic demoulding function. Background technique [0002] Powder metallurgy is a process technology for preparing metal or using metal powder (or a mixture of metal powder and non-metal powder) as raw materials, forming and sintering, to produce metal materials, composite materials and various types of products. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, which is very suitable for mass production. [0003] Functionally graded materials (functionally graded materials), the concept of which was first proposed by Japanese scholars such as Shinno Masayuki and Hirai Toshio in 1986. It refers to the continuous change of the composition and structure of the material from...

AI Technical Summary

Problems solved by technology

However, due to the fixed inclination of the truncated cone, the temperature gradient of the inner wall temperature of the mold cannot be adjusted and the temperature gradient is limited

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