Quality appraisal of powder metallurgy production line

Powder metallurgy is a metallurgical engineering, materials science and mechanical parts manufacturing technology that produces metal powders and uses metal powders (also including non-metallic powders) as raw materials to produce metal materials, composite materials and various types of products through shaping and sintering.

The production process of powder metallurgy can be divided into five stages: powder preparation → raw material powder + additives → molding (molding, CIP, slurry casting, rolling, extrusion, warm pressing, injection molding) → sintering (pressure sintering, hot pressing, HIP, etc.) → post-processing.

Zhongke Testing and Laboratory can provide quality identification services for powder metallurgy production lines and make accurate identifications in aspects such as product design analysis, load analysis and product quality analysis.

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powder metallurgy production line equipment can be divided into:

(1) Powder preparation equipment: including ball mills, high-energy ball mills, airflow mills, spray dryers, etc., used to prepare metal powders.

(2) Press molding equipment: including presses, injection molding machines, etc., used to press metal powder into the required part shape.

(3) Sintering equipment: including sintering furnaces, vacuum sintering furnaces, etc., used for high-temperature sintering of pressed and formed parts to form dense metal parts.

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JB/T 7907-2011 Powder metallurgy oil pump gear technical conditions

JB/T 12080-2014 Powder metallurgy mechanical press technical conditions

JB/T 7379-1994 JZS series powder metallurgy oil pump rotor technical conditions

JB/T 7908-1999 Internal combustion engine powder metallurgy oil pump rotor technical conditions

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After the powder metallurgy production line equipment purchased by an engineering company was installed and debugged, the single-machine structure was first put into use. The supplier repeatedly re-cut the structure, repaired welds, added new parts and rectified the structure. Welding openings were common, and the dryer also experienced explosion accidents and material leakage. Environmental protection testing emissions have not been up to standards, and normal production has been impossible. The engineering company believed that the powder metallurgy production line involved in the case had product quality problems and sued the local court.

Our company was entrusted by the court to identify the product quality issues of the powder metallurgy production line involved in this case.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, on-site investigation and inspection conditions, and inspection and testing data of the "powder metallurgy production line" involved in the case, and made the following quality analysis opinions:

The faults of each single machine of the powder metallurgy special equipment production line are clear , some of them do not meet the national mandatory standards or industry standards;

0 equipment has obvious welding quality problems;

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2 single machine production capacity is insufficient to cause the entire line production capacity to fail to meet the capacity requirements specified in the contract;

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4 single machine equipment is blocked and no active cleaning measures are designed, posing safety risks.

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