Vertical grinder quality appraisal

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vertical grinder takes the synergy of high-precision grinding and rigid structure as its core principle. By optimizing the spindle rotation accuracy, worktable flatness and CNC system positioning accuracy, it achieves the synergy of complex curved surfaces, high-precision dimensional tolerances and processing efficiency. It is widely used in mold manufacturing, aerospace, precision machinery and automotive parts processing. In mold processing, it is used for mirror polishing and high-precision trimming of mold cavities; in the aviation field, it meets the needs for efficient grinding of titanium alloy blades; in precision bearing production, it ensures the nanometer-level surface integrity of the raceway surface. Compared with traditional horizontal grinders, vertical grinders have the characteristics of high space utilization, excellent multi-axis linkage accuracy and strong thermal stability, and are the core equipment for ultra-precision machining.

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

As the demand for precision machining accuracy escalates, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive processing surface roughness, insufficient repeat positioning accuracy;

2, material defects: insufficient Cr content in spindle bearing steel, peeling of guide rail plastic layer Strength;

3, process problems: spindle dynamic balance deviation, CNC system interpolation error;

4, contract performance dispute: core modules (such as linear motor brand, grating scale resolution) are not consistent with the technical agreement.

0 Such cases need to pass processing accuracy verification, material failure analysis and dynamic performance testing to clarify the quality responsibility.

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The technical methods for quality appraisal of vertical grinders include:

1. Appearance inspection: Check the appearance of the equipment for deformation, cracks, defects, etc.

2. Accuracy detection: Use precision measuring instruments to detect the geometric accuracy, flatness, verticality, etc. of the equipment.

3. Stiffness test: load a certain weight, measure the deformation of the device, and evaluate the stiffness.

4. Efficiency evaluation: By processing test pieces, the processing speed and efficiency of the equipment are measured.

05. Safety performance test: Check whether protective devices and electrical systems comply with safety regulations and whether there are any safety hazards.

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A mold factory of the applicant signed a "Five-axis Vertical Grinder Purchase Contract" with an equipment manufacturer of the respondent, agreeing that the surface roughness Ra≤0.1μm. After being put into production, vibration marks (Ra≥0.4μm) appeared on the surface of the mold cavity. The manufacturer argued that it was caused by improper parameter settings by the operator.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "vertical grinder", contract technical agreement, on-site inspection case materials and other data, and made the following quality analysis opinions :

The spindle bearing of the vertical grinder involved in the case has a radial runout of 0.003mm (agreement ≤ 0.001mm) and a Cr content of only 0.9% (agreement 1.3-1.6%); the CNC system interpolation cycle delay is 2ms (agreement ≤ 1ms), resulting in a trajectory error of 0.008mm.

The appraisal conclusion determined that defects in the spindle material and control system were the main reasons for the machining failure.

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Vertical grinder quality appraisal report should include:

1, purpose of appraisal (such as processing accuracy disputes, technical compliance verification) and reference standards;

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

3, testing methods and equipment list (such as laser interferometer, roundness meter);

4, correlation analysis between detection data and failure (such as the impact of spindle runout on surface roughness);

05,clear quality responsibility determination conclusion and technical basis;

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26,signature of appraiser, mechanical engineer qualification certificate and official seal of the organization.

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