Heavy duty double-sided grinding machines are widely used in the field of precision component manufacturing due to their efficient double-sided synchronous processing capabilities. Scratches on the surface of the workpiece, as a typical quality defect in the processing of this equipment, not only damage the surface smoothness, but may also weaken the mechanical properties of the workpiece, directly affecting the product qualification rate. Therefore, establishing a scientific troubleshooting process and implementing precise repairs are crucial for ensuring production quality.

Troubleshooting should follow the principle of "layered traceability and precise positioning", starting from the four key links of materials, fixtures, equipment, and processes. At the material level, it is necessary to focus on checking the cleanliness of the grinding fluid and the state of the abrasive particles. Metal debris or aggregated abrasive particles mixed in the grinding fluid can easily form hard scratches during processing; Uneven abrasive particle size may also lead to excessive local cutting force and scratches. In terms of tooling, wear grooves, broken edges, or loose embedded blocks on the surface of the grinding disc will directly form rigid friction with the workpiece surface; The surface burrs or deformations of the positioning fixture may also cause contact scratches during clamping and processing.

At the equipment and process level, excessive radial runout of the spindle can cause the grinding disc to deviate from its trajectory, leading to localized pressure concentration and scratching; If the grinding pressure is set too high and the speed is not properly matched with the workpiece material, it will intensify the cutting effect of the abrasive on the surface of the workpiece, forming regular scratches. During troubleshooting, the root cause of the fault can be identified by stopping the machine to check the status of the tooling, testing the accuracy of the idle testing equipment, and verifying the process parameters through small-scale trial processing.

For scratches of different causes, repair needs to balance "defect elimination" and "precision preservation". Minor scratches on the workpiece can be treated with fine polishing, using polishing paste with appropriate particle size and low-speed polishing process to remove scratches; If the scratch is deep, the surface needs to be smoothed by micro grinding before polishing. In terms of equipment and tooling repair, the grinding disc needs to undergo flat grinding correction to restore surface flatness and smoothness; The burrs on the positioning fixture can be removed by grinding, while the deformed parts need to be corrected or replaced. Scratches caused by improper process parameters need to be re matched with grinding pressure and speed based on the material of the workpiece. If necessary, adjust the concentration of the grinding fluid to enhance the lubrication effect.

The core of preventing scratch faults lies in establishing a normalized maintenance mechanism: regularly filtering grinding fluid and detecting the status of abrasives, conducting weekly wear checks on grinding discs and fixtures, and calibrating equipment spindle accuracy on a monthly basis. Through the closed-loop management of "investigation and traceability - precise repair - normal prevention", the scratch defect rate can be effectively reduced, ensuring the stability of the processing quality of heavy-duty double-sided grinding machines.