Quality appraisal of lathe equipment

lathe equipment takes the synergy of precision cutting and dynamic stability as the core principle. By optimizing the spindle radial runout, repeated positioning accuracy and cutting force control, it achieves the synergy of workpiece processing accuracy, surface roughness and production efficiency. It is widely used in the field of batch processing of shafts, discs and threaded parts. In precision turning, it is used for continuous cutting of high-hardness materials; in slender shaft machining, it meets the vibration resistance requirements; in the field of CNC lathes, it ensures the program execution accuracy of multi-axis linkage. Compared with traditional equipment, CNC lathes have features such as intelligent compensation (real-time correction of thermal deformation/tool wear), multi-process integration (turning and milling), and data traceability (cloud storage of processing parameters), and are core equipment for high-end manufacturing.

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

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

1, performance index dispute: excessive processing roundness, spindle temperature rise;

2, material defects: insufficient hardness of bed casting, peeling of guide rail wear-resistant coating;

3, process issues: turret repetitive positioning accuracy, CNC system interpolation error;

4, contract performance dispute: core modules (such as imported spindle bearings, high-resolution encoders) are inconsistent with the technical agreement.

Lathe equipment quality appraisal technical methods mainly include:

1, appearance inspection

Appearance inspection is the first step in identification. The appraiser will conduct a detailed inspection of the appearance of the equipment to see if there is any obvious damage, deformation, rust, etc. For example, whether there are cracks in the shell of the equipment, whether the components are firmly installed, etc. Appearance inspection can initially determine whether the equipment has been impacted by external forces or has serious aging problems.

2, performance testing

Performance testing is the core content of the identification. The appraisers will test various performance indicators of the equipment based on the technical contract and industry standards. For example, testing the machining accuracy, spindle speed, feed speed, etc. of the equipment. By testing these performance indicators, it can be judged whether the equipment can meet the usage requirements agreed in the contract.

0

An automobile parts factory of the applicant signed a "CNC Lathe Purchase Contract" with an equipment manufacturer of the respondent, and it was agreed that the processing roundness should be ≤0.008mm. After being put into production, the roundness error reached 0.025mm. The manufacturer argued that it was caused by incorrect cutting parameters.

identification analysis results:

The quality analysis expert group discussed and synthesized technical data on "lathe equipment" related information, contract technical agreements, on-site inspection case materials and other data Analysis, the following quality analysis opinions are made:

The spindle radial runout of the lathe equipment involved in the case is 0.012mm (agreement ≤0.005mm), the turret repeat positioning accuracy is ±0.03mm (agreement ±0.01mm); the bed casting hardness is HB 160 (agreement ≥ 180), resulting in excessive cutting vibration.

The appraisal conclusion determined that the mechanical accuracy and material defects of the equipment were the main reasons for the failure.

Lathe equipment quality appraisal report should include:

1, appraisal purpose (such as product defect attribution, contract compliance verification) and reference standards;

2, involved equipment model, control system version, production log;

3, detection method and equipment clearance Single sheet (such as universal testing machine, thermal imaging camera);

4, correlation analysis between test data and failure (such as the impact of pressure deviation on bubble rate);