Quality Classification of Dongguan Precision Castings

In the quality standards of stainless steel precision casting castings, the prayer parts are divided into three grades: qualified, first-class, and superior. Qualified products refer to the appearance quality and internal quality that meet the current national standards or industry standards, and the production process and quality are stable. User evaluation can meet the performance of castings;

The first-class product refers to the appearance quality and internal quality that meet the current national standards or industry standards, the production process and quality location are stable, and the user evaluation and the quality of the castings that have reached the internal advanced level. Or industry standards, the production process and quality are stable, and users evaluate the quality of the castings to reach the international advanced level, and have the ability to compete in the international market.

If there is one item of robot stainless steel parts that does not meet the standard, it is unqualified. The generalized casting defect refers to the casting quality although the index characteristics do not meet the grading standard, the quality management of the casting factory is poor, and the product quality cannot be effectively guaranteed.

Narrowly speaking, the defects of stainless steel precision casting castings are detectable on the castings, including over-tolerance in size and weight, low appearance quality, unsound internal quality, material failure to meet the acceptance technical conditions and other defects.

Defects can also be divided into eliminable defects and non-eliminable defects according to their degree of elimination. For example, the density of stainless steel precision casting castings is not high (there is unremovable porosity), and the internal residual stress is difficult to control, which is an unremovable defect. The removal of defects is specific and can be detected. The cause should be found in time. , To be effectively corrected in the general rules of casting quality tooth grading.

Coffee machine parts castings other than quality grades are called unqualified products. As a commodity, castings are also unqualified products if they do not meet the requirements of the order contract. Unqualified products are also called defective products. They can be divided into scrap, defective, repaired and repaired products. Recycling products (concave charge). Scrap products refer to products that do not meet the specified requirements and cannot be used normally, or casting defects that cannot be repaired or the repair cost is too high, and the economically uneconomical unqualified products.