Preparation method and special mold for one-time forming multi-curved integral bulletproof plate

Abstract

The invention discloses a special die for one-step-formed multi-curved-face integral bullet-proof plates. The special die comprises an upper punch (2), a lower punch (3), an outer die (4) and a plug block (5). A die cavity (41) is formed in the outer die (4) and is communicated with two ends of the outer die (4). An opening (42) used for charging is formed in the top of the outer die (4) and is matched with the plug block (5) in shape. The die cavity (41) is communicated with the opening (42). The upper punch (2) is connected with an upper die plate of a semi-automatic horizontal press machine, and the lower punch (3) is connected with a lower die plate of the semi-automatic horizontal press machine. The upper punch (2) and the lower punch (3) can get into or come out of the die cavity (41) under the drive of the upper die plate and the lower die plate. The invention further provides a manufacturing method for the one-step-formed multi-curved-face integral bullet-proof plates by the special die.

Description

technical field [0001] The invention relates to a one-time molded multi-curved integral bulletproof plate of ceramic material. Background technique [0002] In military, national defense and other fields, bulletproof plates are widely used. Bulletproof plates include bulletproof chest plates, shoulder pads, knee pads, etc. The use of these bulletproof plates can effectively reduce the chance of injury to important parts of the human body in dangerous situations. Therefore, the design and production of bulletproof plates is a hot spot nowadays. Silicon carbide, alumina, boron carbide and other ceramic materials can be used as bulletproof plates. [0003] At present, most of the bulletproof plates on the market are spliced ​​by small hexagonal pieces. The hexagonal bulletproof sheets have high dimensional accuracy, and the edges and corners need to maintain sharp angles. The splicing and bonding operations are complicated, the technical difficulty is relatively high, and the...

AI Technical Summary

Problems solved by technology

[0005] The traditional dry pressing method cannot ensure the uniform distribution of the powder between the arc-shaped punches, resulting in inconsistent compression ratio of the green body, uneven thickness and density, and serious cracking of the product.

Only the secondary molding method can be used, that is, the parallel polygonal pre-pressed blanks are first pressed, and then put into the curved mold for secondary shaping and pressing. The process is complicated and the production efficiency is low, so it is not suitable for mass production.

[0006] The advantage of the grouting molding method is that it can produce large-sized and complex-shaped products. The disadvantage is that when using a plaster mold, the end close to the plaster mold is dense and regular due to the strong adsorption force; Force attenuation, loose arrangement, and problems such as "sandwich"

[0007] The isostatic pressing method is suitable for the preparation of a single curved surface. After the isostatic pressing cylinder is cut in half from the middle, the equipment requirements are high and the operation is difficult. The cutting of the green body after forming is likely to cause corner defects, and the production efficiency is low. , not suitable for mass production

[0008] The invention of the application number 201110088420.6 "Integral arc-shaped large-size alumina bulletproof ceramic plate and its mold" adopts the water-based slurry gel injection molding method to prepare the integral arc-shaped large-size alumina bulletproof breast plate, and adds organic matter to the slurry. During the heating process, the evenly distributed organic matter can solidify the product evenly, the product has uniform density distribution, accurate size, and smooth surface. This method does not have high requirements for molds. Glass, plastic, metal, wax, etc. can be used as molds, but its The disadvantage is that the processing cycle is long, the process is cumbersome, and the processing cost is high

[0009] The invention of the application number 201310578740.9 "An Integral Silicon Carbide Ceramic Bulletproof Plate and Its Manufacturing Method" first uses the extrusion molding process to extrude the wet billet of the bulletproof plate, and then presses it into a green billet with a curved surface shape. After drying High-temperature sintering, the green body prepared by this method has high moisture content, is prone to deformation during the drying process, and the sintered density of the finished product is low, and the preparation process is cumbersome and the production efficiency is low

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