Stamping equipment quality appraisal

stamping equipment takes the synergy of high tonnage pressure and precise stroke control as the core principle. By optimizing nominal force, stroke repetition accuracy and punch stability, it achieves the synergy of efficient molding of metal sheets, mold life and energy consumption control. It is widely used in the mass production of automobile panels, home appliance sheet metal, electronic connectors and hardware products. In automobile body manufacturing, it is used for deep drawing forming of four-column hydraulic presses; in precision blanking, it meets the mold matching requirements for micron-level gaps; in high-speed stamping, it ensures the dynamic balance of continuous production. Compared with traditional equipment, stamping equipment has the characteristics of intelligent servo drive, fault prediagnosis and rapid mold change, and is the core equipment of the metal forming process.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide stamping equipment quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for stamping equipment quality appraisal.

As the complexity of the stamping process increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: insufficient nominal force output, poor springback of stamping parts;

2, material defects: peeling off of the wear-resistant coating of the slider guide rail, rapid aging of hydraulic cylinder seals rate;

3, process problems: slider parallelism deviation, lubrication system failure;

4, contract performance dispute: core modules (such as imported servo motors, high-precision displacement sensors) are inconsistent with the technical agreement.

stamping equipment quality appraisal technical methods mainly include:

1, appearance inspection method

Appearance inspection is one of the basic methods for identifying the quality of non-standard stamping equipment. Appraisers directly observe the appearance of the equipment to check whether there are obvious defects, such as fuselage deformation, surface scratches, paint peeling, etc. Appearance inspection can initially determine the manufacturing quality and usage status of the equipment.

2, measurement and detection method

The measurement and detection method is to measure the size, accuracy, performance and other parameters of the equipment by using various measuring tools and instruments. For example, use calipers to measure the dimensions of stamping parts and use a durometer to measure the hardness of materials. Measurement and detection methods can obtain accurate values and provide a basis for judging whether the equipment meets quality standards.

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An automobile parts factory of the applicant signed a "2500kN Servo Stamping Line Purchase Contract" with an equipment manufacturer of the respondent, agreeing that the mold life should be ≥ 600,000 times. After being put into production, the mold cracked after only being used 250,000 times. The manufacturer argued that it was caused by improper heat treatment of the material.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "stamping equipment", contract technical agreements, on-site investigation case materials and other data, and made a comprehensive technical analysis. The following quality analysis opinions were issued:

The slider parallelism deviation of the stamping equipment involved in the case was 0.08mm/300mm (agreement ≤ 0.03mm), causing the mold to be eccentrically loaded; the Cr content of the mold steel was only 0.3% (agreement 0.8-1.2%), and the hardness was HRC 56 (agreement ≥58).

The appraisal conclusion determined that defects in equipment mechanical accuracy and material composition were the main causes of mold failure.

stamping equipment quality appraisal report should include:

1, appraisal purpose (such as mold failure attribution, performance verification) and reference standards;

2, involved equipment model, control system version, operation and maintenance records;

3, detection method and equipment list ( Such as pressure sensor, three-dimensional coordinate instrument);

4, correlation analysis between detection data and failure (such as the impact of slider parallelism on eccentric load);