Pressing demoulding method of equal-density pressing machine

Abstract

The invention discloses a pressing demoulding method of an equal-density pressing machine. The equal-density pressing machine comprises an upper pressing mechanism, a middle mould mechanism and a lower pressing mechanism. The upper pressing mechanism comprises an upper punch which can move up and down, the lower pressing mechanism comprises a lower punch which can move up and down, and the middle mould mechanism is provided with mould holes which correspond to the upper punch and the lower punch. The pressing demoulding method comprises a feeding step, a pressing step, a pressure maintaining demoulding step and a demoulding step. In the pressure maintaining demoulding step, the upper punch and the lower punch move upwards, and pressure maintaining is carried out on a pressed material element until the top end of the pressed material element is flush with the surfaces of mould holes. In the demoulding step, when the pressed material element starts to leave the mould holes, the upper punch is separated from the material element and goes back to the original position, the lower punch moves upwards continuously until the material element is pushed out of the mould holes completely, accordingly, the material element can be effectively prevented from being cracked in the pressure maintaining demoulding step, and cracking caused by the fact that pressure exerted on the top end of the material element exceeds the bearing capacity of the material element can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of material pressing, in particular to a pressing and demoulding method of an isodensity press. Background technique [0002] The structure of the existing single-station press is usually that a guide post is arranged on the base, the lower punch is fixed on the base, the upper punch is fixed on the guide plate, and the guide plate is slidably arranged on the guide post and connected with the main press. The upper punch can move up and down with the guide plate, and the middle platen is also slid on the guide column and driven by the oil cylinder below it to move up and down. The upper punch and the lower punch can move with the middle plate. The die holes at the corresponding positions of the templates are matched. [0003] For example, the Chinese patent document CN102717075A discloses a powder automatic forming mold base based on a powder metallurgy press machine and its realization method, wherein the r...

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is the technical problem that the existing single-station presses tend to cause the density of the pressing elements to be uneven and easy to crack during the pressing operation, so as to provide a kind of equal density pressing, and can effectively prevent the pressing elements from Pressing and demoulding method of isodensity press that cracks during demoulding

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