Stone grinding machine tool quality appraisal

stone grinding machine is the core equipment of the stone processing industry and is used for surface grinding, polishing and special-shaped processing of natural stones such as marble and granite. It uses a high-precision grinding head and a CNC system to achieve a mirror effect of stone surface roughness Ra≤0.1μm, and is widely used in architectural decoration, home building materials, handicraft manufacturing and other fields. Compared with traditional manual grinding, modern CNC grinding machine tools occupy a key position in the stone deep processing industry chain due to their high degree of automation, stable processing efficiency, and low energy consumption. They are an important support for promoting the industry's development towards standardization and refinement.

With the upgrading of the stone processing industry, the number of quality disputes over grinding machine tools has gradually increased. Judicial disputes focus on: whether the equipment meets the contracted processing accuracy (such as flatness ≤ 0.05mm/m), surface roughness, production efficiency and other indicators; whether there is stone scrapping due to mechanical wear and control system failure; and the correlation between quality problems, order breaches, economic losses, etc. In such cases, the quality appraisal of stone grinding machine tools provides a scientific basis for the court to determine liability and loss compensation through geometric accuracy testing, processing parameter analysis and other technical means, and promotes industry technical standards and transaction fairness.

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

Stone grinding machine tool quality appraisal technical methods include:

1, appearance and structural inspection

Check whether the materials of key components such as the bed and grinding head guide rail (such as cast iron HT300) meet the strength requirements, and whether there are cracks or rust on the surface.

2, dimensional accuracy detection

Use vernier calipers or micrometers to measure the dimensions of the main components of the machine tool, including the flatness of the grinding table, the verticality of the grinding head, etc.

0 uses an acceleration sensor to analyze the vibration spectrum of the grinding head and identify abnormal vibration sources (such as bearing failures). Measure the operating noise of the equipment to confirm compliance with industrial environmental standards.

1

2

3

4

A stone processing factory of the applicant signed a "CNC Grinding Machine Purchase Contract" with a machine tool company of the respondent, agreeing to purchase 2 stone grinding machine tools of model WM-600. After the equipment was put into use, problems such as periodic ripples and insufficient gloss appeared on the surface of the processed stone, resulting in delays in order delivery. The processing plant believed that the equipment had a design defect and demanded compensation for losses. The machine tool company argued that the problem was caused by differences in stone material or improper operation, and both parties filed suit in court. The court entrusted a third-party appraisal agency to conduct quality appraisal of the equipment involved in the case.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "Stone Grinding Machine Tool", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

1. The clearance of the grinding head spindle bearing of the stone grinding machine tool involved in the case is too large (actual measurement) 0.03mm, standard ≤0.01mm), resulting in unstable grinding force. There was local wear on the bed guide rail, and the straightness deviation exceeded the contract

2. The interpolation error of the CNC system of the stone grinding machine involved reached 0.02mm (standard ≤0.005mm), resulting in a deviation in the processing path. The human-machine interface does not set the linkage protection between the grinding head speed and the feed amount, allowing hyperparameter operation.

Stone grinding machine tool quality appraisal report should include the following content:

1. Information of the appraisal client and the appraised party.

2. Testing items, sampling methods, testing methods and equipment.

3. Test results and analysis.

4. Quality evaluation conclusion.