Introduction to mold accuracy

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The level of mold production technology and scientific and technological content has become an important symbol to measure the level of a country's science and technology and product manufacturing, which largely determines the quality, efficiency, and development ability of new products, and determines the international competitiveness of a country's manufacturing industry. According to the development of domestic and international mold markets, relevant experts predict that in the future, China's molds will be adjusted by the industry structure, and the accuracy of molds will become higher and higher.

Mold is the basic process equipment of industrial production, in electronics, automobiles, motors, electrical appliances, instruments, home appliances and communications and other products, 60% ~ 80% of the parts rely on mold forming, the shape of the mold determines the shape of these products, mold processing quality and precision also determine the quality of these products. The LCD frame and other products produced by our company, the material thickness is usually about 0.2mm, belongs to the ultra-thin precision metal product series, the flatness of the product is controlled at about 0.1~0.4mm, the key dimensional tolerance is ± 0.05, and the pier requirements are below 0.02~0.05mm, which requires the accuracy of the mold manufactured by our company to reach ±0.02mm.


This paper analyzes the concept of mold accuracy, discusses how to ensure mold accuracy from the procurement of mold processing equipment, spare parts, mold gap size, mold structure requirements, assembly technical requirements and mold manufacturing, management, testing and other influencing factors, and puts forward the technical parameters of mold accuracy requirements, providing mold manufacturing enterprises with industry standards in mold accuracy.

The concept of mold accuracy

1. Mold refers to precision forming tools used as batch forming processing, stamping and other products. Mold accuracy includes the accuracy of parts obtained on processing and the quality awareness of ensuring product accuracy during production, but the mold accuracy usually referred to mainly refers to the accuracy of mold working parts.

(1). The concept of precision in mold processing refers to the degree of consistency between the actual geometric parameters of the mold parts after processing and assembly and the design geometric parameters.

(2). The concept of precision in mold production refers to a thinking mode gradually formed by enterprise employees in production practice and guiding their production behavior, a kind of quality awareness, that is, in the behavior of enterprise employees, always implement the quality awareness of product accuracy.

2. The content of mold accuracy includes four aspects: dimensional accuracy, shape accuracy, position accuracy, and surface accuracy. Since the mold is divided into two parts, the upper mold and the lower mold during work, the mutual position accuracy between the upper and lower molds is the most important among the four kinds of accuracy.

3. Mold accuracy is to serve the precision of products, high-precision products must be guaranteed by higher precision molds, mold accuracy must generally be higher than the accuracy of parts 2 or more than 2.