Forming method of annular voltage-sensitive resistor

Abstract

The molding method of the ring varistor includes the following steps in sequence: (a) mixing: put the powder with binder and solvent in the kneader and mix evenly; (b) rough rolling: the above powder is mixed After training, the material is discharged to the rolling mill for the first rolling; (c) freezing: the mud obtained by rough rolling is sealed and refrigerated at 0-10°C; (d) finishing rolling: the mud obtained after refrigeration is subjected to the second rolling. Secondary rolling to make it uniform and compact; (e) Extrusion: place the finished mud in a vacuum extruder to extrude into a film belt with good uniformity, density and consistency; (f) drying; (g) stamping. The method can improve the uniformity and compactness of the green body and make the production efficiency higher.

Description

technical field [0001] The invention relates to a molding method of ceramics, in particular to a molding method of a ring piezoresistor. Background technique [0002] At present, the forming of ring varistors usually adopts two processes of dry pressing forming and rolling film forming. Dry pressing is formed by pressing the spray granulated powder on a pressure forming machine. Single-head press or rotary press is mostly used. The defect is that the density of the green body after pressing is not uniform enough, which affects the quality of the powder and the quality of the mold. And workers have high requirements for operation technology, and it is easy to cause layering, edge drop, and mold sticking of the green body; in addition, the dry pressing molding has a lot of dust pollution, and it needs to be equipped with expensive spray granulation equipment. Generally, it is difficult to prepare a thickness of Ring products below 0.5mm. The roll film forming process is to p...

AI Technical Summary

Problems solved by technology

Dry pressing is formed by pressing the spray granulated powder on a pressure forming machine. Single-head press or rotary press is mostly used. The defect is that the density of the green body after pressing is not uniform enough, which affects the quality of the powder and the quality of the mold. And workers have high requirements for operation technology, and it is easy to cause layering, edge drop, and mold sticking of the green body; in addition, the dry pressing molding has a lot of dust pollution, and it needs to be equipped with expensive spray granulation equipment. Generally, it is difficult to prepare a thickness of Ring products below 0.5mm

The extrusion molding process is mainly used in the molding of tubular, rod, honeycomb, and sieve-shaped perforated ceramic cylinders, as well as electronic ceramic bodies such as resistor substrates and tubular capacitors. So far, no application of the extrusion process to ring varistors has been found. forming