Forming process and device of a complex curved surface bulletproof insert

Abstract

The invention discloses a forming process and device for bulletproof inserts with complex curved surfaces, which includes the following steps: Step 1: After boron carbide powder is granulated through pulping and spray drying, the surface of the powder particles is modified and a sintering aid is added, Promote the activity between boron carbide particles during the sintering process, and press it into a green body with a steel mold; Step 2: Put the prepared green body into the sintering furnace, vacuum sinter to 2200 degrees, and then keep it warm for 60 minutes, and then cool after sintering The forming process and device of the complex curved bulletproof inserts are based on the setter plate installed inside the sintering furnace, and the setter not only maintains a relatively uniform temperature of the airflow directly in contact with the complex curved bulletproof inserts and setters, At the same time, it can play the role of stably supporting the bulletproof insert with complex curved surface, and further improve the stability of the bulletproof insert when sintering inside the sintering furnace body.

Description

technical field [0001] The invention relates to the technical field of bulletproof board processing, in particular to a forming process and device for bulletproof boards with complex curved surfaces. Background technique [0002] The multi-curved bulletproof insert is a continuous and gradual complex curved surface. The product is composed of circular arcs with different curvatures at each position. The blanks in the compression molding stage in the pressureless sintering process require that the density of the blanks at each position should be basically equal. This requires that the weight of the powder distributed in each unit volume of the blank should be substantially equal before compression molding. [0003] In the actual application of the bulletproof board, in order to ensure the comfort of the user, its shape is composed of an ergonomically designed, continuous and gradually changing complex curved surface. In order to ensure the curved surface structure of the bull...

AI Technical Summary

Problems solved by technology

[0004] In the pressureless sintering process of boron carbide ceramics, due to the need to meet the densification requirements, the product is placed on the sintering plate, which is placed inside the high-temperature sintering furnace for sintering deformation. There will be a process of volume shrinkage of about 20%, and the volume shrinkage will cause the shape of the curved surface of the product to change, and the process of shrinkage and shape change is all completed above 2200°C. In this ultra-high temperature environment, thermoelectric The measuring part of the pair will be damaged due to excessive temperature. At the same time, during the deformation process of the product, because the bulletproof plate is a complex curved shape, and the internal temperature of the sintering furnace is controlled by heating, heat preservation, cooling and cooling. Therefore, it often occurs that the temperature distribution in the airflow in contact between the bulletproof plate and the setter plate is uneven, which makes the production and control of the bulletproof plate very difficult. For this reason, we propose a complex curved surface Forming Technology and Device of Bulletproof Insert

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