SJ-60 Type Diameter Reducing Machine
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SJ-60 Type Diameter Reducing Machine
Product Introduction
The SJ-60 diameter‑reduction machine is a non‑cutting machining device that offers high production efficiency, simple processes, ease of operation, material savings, and stable quality. It employs hydraulic technology to cold‑press and form the portion of round steel requiring diameter reduction by feeding it into a specialized die cavity. This process significantly increases the density of the reduced section, thereby enhancing the material’s tensile strength, while maintaining its ductility and impact toughness. As a result, the strength of the threaded portion and the shank are uniform, eliminating the drawbacks associated with reduced tensile strength and impact toughness caused by lathe‑turned surface removal.
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 uniform, addressing the drawback of lathe‑turned peeling, which typically reduces both tensile strength and impact toughness. The diameter‑reducing machine is an ideal solution for manufacturing anchor bolts, foundation screws, and long‑rod screws used in mining applications.
1. The diameter‑reducing machine is equipped with lifting posts, on which wire ropes of appropriate length and diameter can be suspended. To prevent the wire ropes from scratching the machine tool during lifting, padding should be placed at the contact points. The diameter‑reducing machine may be installed directly on a flat, solid workshop floor. In workshop environments subject to impact and vibration, a concrete floor should be poured.
2. Adjustment of the diameter-reducing machine: First, connect the reducer to the power supply 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 are the common malfunctions of a diameter-reducing machine and how can they be resolved?
1. Excessive oil temperature: If the engine oil viscosity is too high or the feed pressure is excessive, and if the ambient temperature is too high, 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. The relief valve has failed; replace the valve. The oil pump coupling is worn.
3. Unstable magnetic field during jog operation: Verify that the magnetic circuit is unobstructed, including the contactor’s normally open contacts, wiring connectors, and stop button.
4. During operation, the contactor of the diameter-reducing machine emits a buzzing sound: Open the contactor’s base and clean the 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 pushbutton mechanism is not jammed.
7. After startup, the unit stalls; restore power after opening the circuit breaker: 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 damage to the circuitry above the contactor. Inspect the wiring from the control system to the circuit board for any faults. 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 now be identified; the start button may be damaged.
Technical Specifications
| Diameter reduction range (customizable for special users) | φ12-φ60 | Clamping hydraulic cylinder | 50T*3 |
| Shrinkage length | 0mm-400mm | Maximum pressure of the hydraulic system | 25Mpa |
| Motor power | 22 kW, 1460 r/min | Size | 2600×1500×1650mm |
| Work efficiency (excluding turning time) | 4–7 roots/min | Overall machine quality | 3000kg |
| Reduced-diameter hydraulic cylinder | 80T |
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Product Message
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Hebei Xinggong Machinery Manufacturing Co., Ltd.
Phone:0319-7585009
Email:info@xingg.com
Website:https://www.xingg.com
Address: Industrial Zone, Xingjiawan Town, Xingtai City
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