How to control the quality of precision castings?

Casting quality inspection is an important process in foundry production. Its main functions are:

1. Provide quality information for casting production and management department;

2. Put forward the project for the quality management activities.

3. Guarantee the quality of the product.

The total quality management of the foundry includes two parts, the quality control of the castings and the quality assurance of the castings. It is the quality system carried out in the factory under the premise of the comprehensive and reasonable specification of the technical requirements of the castings.

Casting quality inspection is an indispensable part in the casting production process. Its purpose is to ensure that the quality of castings meets the technical requirements of delivery and acceptance. The quality inspection of castings is based on casting drawings, casting process documents, relevant standards and technical conditions for delivery and acceptance of castings.

For the foundry industry, it is characterized by many processes, strong coherence, and many variables in each process. These variables are difficult and difficult to control, and may eventually be reflected in the causes of the defects.Therefore, as far as defect control is concerned, the prevention of defects should be put in the first place, and the quality problems should be studied and solved continuously.

Through active market research, we should constantly grasp the quality requirements of consumers or users, and carry out serious after-sales service to ensure the quality of the market. Quality management is a comprehensive collection of research and development, production inspection and sales services in one of the activities of the total.

According to the quality inspection results of castings, castings are usually divided into three categories: qualified products, repaired products and unqualified products.

Qualified products refer to castings that conform to the relevant standards or delivery conditions.

Rework means that the appearance and internal quality are not fully conformed to the standard and acceptance conditions, but the rework is allowed and the castings can meet the requirements of the standard and the technical requirements for the delivery acceptance of the castings after the rework.

Unqualified products refers to the disqualification of both the appearance quality and the internal quality, and the castings that are not allowed to be repaired or after reworking still fail to reach the standard and the technical requirements for the casting acceptance

In order to ensure the quality of the castings, different inspection methods should be adopted according to the different uses and requirements of the castings so as to detect the impermissible defects in time. The inspection of castings mainly includes the surface quality inspection, the internal quality inspection and the comprehensive identification quality. The surface quality includes surface defects, dimensional accuracy, quality deviation, surface roughness and so on. The appearance quality affects the subsequent processing and subsequent processing, and also affects the performance. All castings must be checked according to the specified standards for appearance quality inspection, which often need to be completed several times. Therefore, there are different inspection systems for different precision casting parts.