How can a professional technician inspect used KYORI?

Author：J           Date：2025-11-12

The inspection of a used KYORI punch press by professional technicians is a systematic diagnostic process that goes beyond surface appearances and delves into the equipment's "vital signs." It's far more than simply starting it up; it follows a rigorous logical process designed to assess its residual accuracy, reliability, and potential value.

Step 1: Static Precision Inspection

Before powering on the equipment, technicians examine every detail like forensic pathologists.

Structural Integrity: The first step is to check the machine body, slide, and worktable for any minor cracks, weld repair marks, or irreversible deformation. A high-precision level is used to check the machine body's levelness; without a level foundation, all accuracy is meaningless.

Wear and Clearance: The machine is manually rotated to feel for smooth operation. A dial indicator is used to check the parallelism between the slide and the worktable, as well as the perpendicularity between the lower plane of the slide and the worktable. More importantly, at critical guide rails and bearing housings, technicians use feeler gauges to precisely measure static fit clearances. Excessive clearance is direct evidence of long-term heavy-load operation and will directly lead to a loss of stamping accuracy.

Paint and Rust: Observe the paint wear, especially the edges of the T-slots on the worktable. The wear pattern and degree reflect past usage habits and the nature of the processed parts. Pay attention to rust in non-exterior areas, such as the machine's interior, as this indicates the equipment's storage environment.

Step Two: Dynamic Performance Testing

Power-on testing is the core of the inspection, designed to simulate real-world working conditions.

No-load Operation Analysis: Start the main motor, and the technician will listen carefully to the sounds of the gearbox, bearings, and crank-connecting rod mechanism at different speeds. A uniform, muffled rumble is healthy, while any intermittent impact sounds or sharp friction sounds indicate severe wear on specific components. Observe whether the slider runs smoothly and whether there is any abnormal vibration.

Load and Accuracy Verification: This is the "touchstone" of the inspection. The technician will conduct physical test punches, usually using high-precision copper or aluminum. They not only check whether parts can be punched, but also use tools such as micrometers and projectors to rigorously inspect the dimensional tolerances, burr height, and consistency of the test punches. Measuring the dimensional difference between the first and last piece after 100 consecutive stamping cycles is crucial for evaluating the equipment's precision stability under hot-operation conditions. Simultaneously, the response speed and coordination of the clutch and brake are tested to ensure there are no safety hazards such as continuous stamping or slide slippage.

Control System and Functions: The effectiveness of all operating modes (manual, single-stroke, continuous), stroke adjustment, and safety devices (such as photoelectric protection and emergency stop) is tested item by item. For CNC models, the accuracy of each axis movement and the precision of zeroing are checked.

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