Quality appraisal of processing machinery and equipment

processing machinery equipment takes the synergy of high-precision cutting and dynamic stability as the core principle. By optimizing the spindle speed, cutting force control and positioning accuracy, it achieves the synergy of dimensional tolerance, surface roughness and production efficiency of the workpiece. It is widely used in aerospace, automobile manufacturing, mold processing and precision parts production and other fields. In five-axis simultaneous machining, it is used for high-precision milling of complex curved surfaces; in the field of superhard materials, it meets the needs for efficient cutting of titanium alloys/ceramics; in micro-machining, it ensures nanoscale surface integrity (no burrs/microcracks). Compared with general-purpose equipment, processing machinery and equipment have the characteristics of intelligent compensation (real-time correction of thermal deformation), multi-process integration (turning and milling combined) and energy efficiency optimization, and are the core equipment of high-end manufacturing.

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

With the upgrade of processing accuracy requirements, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive machining accuracy, spindle radial runout;

2, material defects: guide rail wear-resistant coating life, tool holder taper contact rate;

3, process problems: thermal deformation compensation failure, cutting chatter amplitude;

4, contract performance dispute: core modules (such as imported CNC systems, hydrostatic guide rail brands) are inconsistent with the technical agreement.

1, Appearance inspection of equipment

Appearance inspection is the first step in equipment quality appraisal. By inspecting the appearance of the equipment, you can find out whether there are obvious damage, deformation, corrosion and other problems. Appearance inspection can also observe whether the equipment's logo, nameplate, etc. are clear and accurate to confirm whether the equipment model, specifications and other information are consistent with the contract.

2, equipment performance testing

Performance testing is one of the core contents of equipment quality identification. According to the requirements of the technical contract, various performance indicators of the equipment are tested to determine whether the equipment complies with the contract. Performance testing usually includes equipment operating parameter testing, accuracy testing, reliability testing, etc. Through performance testing, the performance level of the equipment can be objectively evaluated, providing an important basis for determining whether there are quality problems in the equipment.

3. Structural analysis of equipment

An aviation parts factory of the applicant signed a "Five-Axis Machining Center Procurement Contract" with an equipment manufacturer of the respondent, agreeing on a machining accuracy of ±0.005mm. After the parts were put into production, the deviation rate exceeded 20%. The manufacturer argued that it was caused by vibration during operation.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "processing machinery and equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The spindle radial runout of the processing machinery and equipment involved in the case was 0.003mm (agreement ≤ 0.001mm), and the guide rail coating hardness HV 850 (protocol ≥ 1000); the thermal deformation compensation algorithm fails, and the accuracy shifts by 0.008mm when the temperature rises by 10°C.

The appraisal conclusion concluded that defects in the equipment’s mechanical accuracy and temperature control system were the main causes of the failure.

Processing machinery equipment quality appraisal report should include:

1, appraisal purpose (such as processing accident attribution, performance verification) and reference standards;

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

3, detection method and equipment clearance Single (such as laser interferometer, SEM);

4, detection data and failure correlation analysis (such as the impact of spindle runout on out-of-tolerance);