A kind of sintering process of ceramic spark plug for automobile

Abstract

The invention relates to the technical field of manufacturing ceramic parts, and more specifically relates to a sintering process for ceramic spark plugs for automobiles, including five steps of isostatic pressing, grinding, bisque firing, glazing and high-temperature sintering. The present invention replaces the traditional grouting hot-pressing forming process by using dry pressing, uses an isostatic pressing machine to carry out cold-pressing forming on the dry powder, and controls the feeding amount of the dry powder, heating temperature and time, and the thickness of the glaze layer during the process. And other parameters are continuously optimized, the formed spark plug product has high density, small sintering shrinkage, stable thermal performance, high production efficiency and strong applicability.

Description

Technical field: [0001] The invention relates to the technical field of manufacturing ceramic parts, in particular to a sintering process for ceramic spark plugs used in automobiles. Background technique: [0002] The function of the spark plug is to discharge the pulsed high-voltage electricity sent by the high-voltage wire, break down the air between the two electrodes of the spark plug, and generate electric sparks to ignite the mixed gas in the cylinder; as one of the key ignition components of gasoline or gas engines, the spark plug, It cooperates with the ignition system and the fuel supply system to make the engine work, and the reliability of the spark plug directly affects the power and exhaust emission of the engine; due to the increase of the cylinder compression ratio, the ignition voltage of the spark plug must be increased accordingly, so The working environment of spark plug porcelain insulators will become more and more harsh, and the traditional manufacturin...

AI Technical Summary

Problems solved by technology

[0002] The function of the spark plug is to discharge the pulsed high-voltage electricity sent by the high-voltage wire, break down the air between the two electrodes of the spark plug, and generate electric sparks to ignite the mixed gas in the cylinder; as one of the key ignition components of gasoline or gas engines, the spark plug, It cooperates with the ignition system and the fuel supply system to make the engine work, and the reliability of the spark plug directly affects the power and exhaust emission of the engine; due to the increase of the cylinder compression ratio, the ignition voltage of the spark plug must be increased accordingly, so The working environment of spark plug porcelain insulators will become more and more harsh, and the traditional manufacturing process of spark plug porcelain insulators is mostly slurry injection hot pressing molding, and the porcelain insulators made by slurry injection hot pressing molding will have pores, shrinkage cavities and cracks during firing. Instable thermal performance and other defects, its performance is also difficult to meet the needs of the development of gasoline or gas engines

[0003] A few days ago, powder molding is a very important processing method, an advanced manufacturing technology that saves energy and materials, and is currently a more advanced molding process. With its unique advantages, it has begun to replace traditional molding methods, such as ceramic production. Spark plugs, ceramic balls, plungers, vacuum tube shells and other products, the existing dry powder molding equipment for the production of spark plugs, it is difficult to further improve the processing dimensional accuracy of spark plugs, and cannot meet market requirements