What are the common malfunctions of a diameter-reducing machine and their troubleshooting methods?

Release Date:

2022-08-03 14:28

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Pressure gauge pointer vibration: Oil intake is obstructed; clean the oil cylinder. Vibration during both forward and return strokes may be caused by trapped air—bleed the air out. Insufficient lubrication of the slide block requires replenishing the oil. So, what are the common malfunctions of a diameter‑reducing machine and how can they be resolved?

Sizing machine What are the common malfunctions and their troubleshooting methods?

1. Excessive oil temperature: If the engine oil viscosity is too high or the feed pressure is excessive, and the ambient temperature is also elevated, install a cooler.

2. Low pressure regulation: The oil pump’s reduced‑diameter section is worn; replace it. The oil viscosity is too low; change to a new oil grade. The relief valve has failed; replace the valve. The oil pump coupling is worn.

3. Unstable magnetic field during jog operation: Check that the magnetic circuit is unobstructed, including the contactor’s normally open contacts, wiring connectors, and stop button.

4. During operation, the contactor emits a buzzing sound: Open the contactor’s base and clean any oil or rust from both sides of the iron core.

5. The circuit breaker trips automatically upon startup: this may be due to a short circuit or a burned-out motor.

6. No response upon startup: If the reducer fails to start or there is an open circuit in the power supply, check whether the contactor’s auxiliary contacts and the product‑circuit plug are damaged, and verify that the button mechanism is not jammed.

7. After startup, the unit stalls; after opening the circuit breaker, it resumes operation: the contacts may have been in service for too long or subjected to excessive current, causing them to weld together and fail to release; the pushbutton may be damaged; or oil contamination on the magnetic pole surfaces of the electromagnet core.

8. Electric Leakage: If the diameter‑reducing machine is started without the motor being activated and electric leakage is detected, it indicates that the circuit above the contactor is damaged. Inspect the wiring from the control system to the circuit board for any damage. If leakage occurs after the machine is powered on, it is likely due to contact with certain components. Check for any damaged parts between the motor and the circuit board system.

9. The contactor fails to close properly and vibrates repeatedly when the start button is pressed: If there is a loose connection between the contactor coil and the control button, this should be identified; the start button may be damaged.

What are the adjustment and installation procedures for a diameter-reducing machine?

A diameter‑reducing machine is a non‑cutting machining device that offers high production efficiency, simple processes, convenient operation, material savings, and stable quality. It employs hydraulic technology to feed round steel, threaded steel, and similar workpieces into specialized dies for cold‑pressing. This process significantly increases the density of the steel in the pressed components, thereby enhancing their tensile strength—without compromising ductility or impact toughness. As a result, the strength of the screw shank and the rod section remains consistent, addressing the drawback of lathe‑turned surfaces, which often reduce tensile strength and impact resistance. The diameter‑reducing machine is an ideal solution for manufacturing anchor bolts, foundation screws, and long‑rod screws used in mining applications.

1. Sizing machine It is equipped with lifting posts, on which steel wire ropes of appropriate length and diameter can be suspended. To prevent the wire rope from scratching the machine tool during lifting, padding should be added to the contact areas. Sizing machine It can be installed directly on a flat, solid workshop floor. For workshop environments subject to impact and vibration, a concrete floor should be poured.

2. Adjustment of the diameter-reducing machine: First, connect the power supply to the reducer and start the motor; verify that the rotation direction is correct. Then, adjust the limit switch distance to set the desired length of the compressed workpiece end.

3. Pressure Adjustment: In a hydraulic system, pressure should be adjusted as needed, ranging from low to high. The smaller the working diameter, the lower the required pressure; it is preferable to set the pressure as low as possible. However, at lower pressures, the operating speed is typically slower, so users can select accordingly based on their specific application.

4. Replacing the necking die: Loosen the set screws at the front of the necking die on the necking machine, then remove the end cap. Gently tap the rear of the die with a wedge to extract it. Otherwise, insert the die into the nose and tighten the pressure cap.

What is a diameter-reducing machine?

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