Low speed precision automatic metallographic cutting machine is a key equipment in the field of material analysis, and its cutting accuracy and operational stability directly affect the quality of sample preparation. However, in long-term use, it is inevitable to encounter faults such as insufficient cutting accuracy and equipment jamming. This article combines industry practical experience to systematically sort out the causes and solutions of faults, helping users quickly restore equipment performance.

1、 Troubleshooting and Solution for Insufficient Cutting Accuracy

1. Selection and wear issues of cutting blades

Reason: Low speed precision automatic metallographic cutting machine cutting pieces that do not match the hardness of the material or wear severely can lead to rough cutting surfaces and dimensional deviations. For example, resin cutting blades are suitable for soft materials such as aluminum and copper, while diamond cutting blades are used for high hardness materials such as high carbon steel.

Solution: Regularly check the wear of cutting blades and replace them in a timely manner; Select the appropriate cutting blade type based on material characteristics and optimize cutting parameters such as speed and feed pressure.

2. Abnormal mechanical structure

Reason: The axial backlash of the machine tool, wear of the guide rail, or abnormal motor control may cause positioning errors. For example, damage to the Z-axis bearing can cause overcutting in the cutting direction, while insufficient lubrication of the guide rail can exacerbate vibration.

Solution: Calibrate the reverse clearance compensation value through parameter checking method and adjust the pre tightening force of the screw; Regularly clean the guide rail and apply specialized lubricating oil, and replace worn parts if necessary.

3. Cooling and fixing system failure

Reason: Insufficient coolant flow or loose sample fixture can cause thermal deformation and cutting deviation. For example, coolant impurities blocking the nozzle can cause local overheating, while an uneven workbench can cause uneven stress on the sample.

Solution: Clean the coolant pipeline and replace the filter element every month to ensure that the flow covers the cutting area; Use specialized fixtures to fix small-sized samples and use a level to verify the flatness of the workbench.

2、 Deep reasons and coping strategies for equipment lag

1. Transmission system malfunction

Reason: Loose conveyor belt, abnormal motor noise, or damaged coupling can cause motion jamming. For example, insufficient belt tension can reduce friction and cause feeding stagnation.

Solution: Adjust the tension bolt of the conveyor belt to a sinking of ≤ 5mm; if there is abnormal noise during motor operation, check the wiring or replace the servo driver.

2. Control system parameter disorder

Reason: Missing numerical control system parameters or logical errors may cause abnormal instruction execution. For example, incorrect setting of the G54 workpiece coordinate system can result in X-axis positioning deviation.

Solution: Run standard code snippets through functional program testing to verify parameter integrity; Reset the PLC logic and re-enter the machining program.

In response to the above-mentioned faults, it is recommended to establish a "preventive maintenance+fault ledger" mechanism for low-speed precision automatic metallographic cutting machines: clean key components and check lubrication status every week; Record the phenomena, causes, and handling methods after troubleshooting each time, forming a traceable database. If the problem persists, professional technicians should be contacted promptly for in-depth maintenance.