Common Issues in the Daily Maintenance of Hydraulic Thread Rolling Machines

Release Date:

2022-09-23 17:17

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Next, we’ll discuss common issues in the daily maintenance of fully automatic hydraulic thread‑rolling machines.

1. Due to changes in ambient humidity that can cause condensation on AC contactors, it is essential to implement effective measures to prevent short-circuit faults resulting from such condensation.

2. When cleaning the hydraulic thread‑rolling machine, pay particular attention to removing debris between phases in the input and output lines to prevent phase-to-phase short circuits. Also, be sure to wipe away any contaminants from the surface of the iron core.

3. If uneven wear is detected on the circuit breaker and it can no longer be used safely, a new circuit breaker should be replaced periodically.

Basic Principles of Hydraulic Thread-Rolling Machine Manufacturing and Processing

The fundamental principles underlying the cold‑rolling production and machining of involute splines with small profile shift coefficients. L and R are a pair of involute gear rolling wheels with identical primary parameters, each mounted on one of the hydraulic thread‑rolling machine’s two main spindle bearings. They rotate simultaneously in the same direction, driven by the transmission system. The R wheel is actuated by a hydraulic cylinder to perform axial feed motion, while the L wheel can be adjusted via a variable distribution mechanism so that its imprint on the product’s surface overlaps with that of the R wheel. The hydraulic thread‑rolling machine clamps the workpiece precisely using two centering holes; an adjustable fixture permits radial movement of the workpiece. Under load, the workpiece must swing through an angle Φ about the O point—aligned with the lathe spindle’s central axis—to ensure that, during the cold‑rolling process, the workpiece remains in a self‑aligning rolling condition relative to both rolling wheels, thereby facilitating secure clamping.

Common Issues and Emergency Response Procedures for Hydraulic Thread‑Rolling Machines

1. The air switch fails to start; the main on/off switch remains in the closed position; the power supply has a phase loss; the thermal protector is functioning as a safeguard, while the fuse has blown; wiring is loose or disconnected, and the power transformer has burned out. Check whether the control circuit contacts are making good contact or have become damaged. Inspect the stop/start button for broken or loose wires, and verify that its contacts are in good condition. For the hydraulic thread‑rolling machine, ensure that the front positioning contacts are intact and that the contacts, wiring, and fuse are undamaged.

II. No thread comes out or the thread is tangled

The hydraulic thread‑rolling machine is operating in the wrong direction; the thread‑rolling head’s specifications and model are incompatible with the rebar; the positioning sleeve is incorrectly aligned; the thread‑rolling head is improperly mounted on the equipment; and the rollers or positioning sleeves are damaged.

III. No Reverse Driving

The front limit switch is defective; the time-delay relay is malfunctioning; the steel‑cutting pressure limit switch has insufficient clearance, resulting in inadequate engagement and causing damage or jamming; wiring is loose or disconnected; contact points exhibit poor electrical contact, leading to failure or degradation. Before inspection, verify that the front positioning contacts are properly engaged, that the normally‑closed contacts are reliably open, and that the normally‑open contacts can close as intended, while also confirming that the time controller operates correctly when switching on and off. Afterward, check the rear positioning of the hydraulic thread‑rolling machine: ensure that the normally‑closed contacts are reliably open, and inspect the wiring for loose connections, poor contact, damage, or breaks.

IV. Reverse Thread on the Vehicle

1. The sealing gasket in the linear optical axis has been installed upside down.

2. Flip the button‑type power switch to the “ON” position.

3. Start the hydraulic thread‑rolling machine in the reverse direction to strip the material; press the button to engage reverse, then rotate the die clockwise to roll the threads, and finally reverse the rotation to unwind the threads.

Let me explain what a hydraulic thread‑rolling machine is used for.

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