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A Brief Discussion on the Adjustment and Operating Procedures of Thread Rolling Machines

Release Date:

2022-01-08 00:00

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1. The thread-rolling machine allows you to select automatic rolling, foot‑pedal rolling, or manual rolling by changing the position of the selector switch.

Automatic cycling mode: Start the hydraulic motor and set the selector switch to “Automatic.” Adjust the automatic engagement time and the return‑to‑home time according to the hydraulic requirements. At this point, the sliding carriage advances under hydraulic control governed by the forward‑time relay, and it retracts and holds in the retracted position under the control of the reverse‑time relay.

Foot‑type cycling mode: Insert the foot‑line connector; when the time relay deactivates, operate the foot‑down switch. Under hydraulic pressure, the sliding carriage moves forward, completing the working stroke and then lifting the foot. Subsequently, the sliding carriage returns under hydraulic pressure.

There are many types of thread-rolling machines, including three-axis thread-rolling machines, screw‑rod thread-rolling machines, and fully automatic thread-rolling machines, which can be selected based on the specific application.

II. When installing the screw rod, the connecting rod must be thoroughly cleaned. During the loading and unloading of the roller, the support brackets for the roller wheel rods should be removed separately, and the roller should then be mounted onto the wheel rods. With the aid of adjusting shims, the spiral drum should be positioned at the required axial location. The end faces of the two rollers should be adjusted as closely as possible to a horizontal plane, and shims should be inserted between the roller and its bearing supports to prevent axial movement of the roller.

3. The support base shall be positioned at the center of the workpiece. As the diameter of the rolled piece changes, the position of the support base must also be adjusted. Adjustment procedure: Loosen the two fixing bolts, move the support base to the desired position, and then tighten the bolts.

4. The support block is mounted on the support base, with its top welded using cemented carbide. Loosen the fastening bolts of the support block, adjust its height by adding or removing shims beneath the block, and then tighten the bolts. The height of the support block plays a critical role during the rolling process.

(1) The height of the support block depends on the specifications of the workpiece being rolled; it may be slightly higher or lower depending on the material. Generally, for ordinary steel, high‑carbon steel, and nonferrous metal workpieces, the workpiece center can be set 0–0.25 mm below the roller shaft center. For high‑strength, high‑quality alloy steels and stainless steel workpieces, the workpiece center can be set slightly above the roller shaft center. During operation, users should make adjustments based on actual conditions.

(2) The width of the support block shall be determined such that the rolling wheel does not collide with the support block during rolling. For workpieces with a diameter less than M10, the width should be set close to the allowable value. For workpieces with a diameter of M10 or greater, the top width of the support block may be larger, but it must not exceed 18 mm.

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Introducing several key points for reducing equipment failures in thread-rolling machines.

The working principle of a thread-rolling machine

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Introducing several key points for reducing equipment failures in thread-rolling machines.

In modern enterprises, the utilization rates of various types of equipment are already very high, and the widespread adoption of machinery has also increased operational costs. After all, mechanical equipment is inherently prone to malfunctions. Below, we will focus on thread‑rolling machines and discuss strategies for minimizing such failures.

The working principle of a thread-rolling machine

A thread-rolling machine is a versatile cold-extrusion forming machine tool. Within its specified rolling force range, it can perform thread rolling, straight‑thread rolling, and helical‑thread rolling on workpieces in the cold state; it can also roll straight gears, helical gears, and helical spline gears; additionally, it can carry out straightening, diameter reduction, burnishing, and various forming‑roll operations.

Cold Rolling Process for Thread Rolling Machines

Thread‑rolling machines are primarily used for cold roll‑forming. Cold roll‑forming is a chipless manufacturing process that employs rolling tools to achieve shaping through plastic deformation. During this process, the metal fibers remain continuous, and the radial compressive forces generated by rolling effectively enhance the workpiece’s surface finish, hardness, and strength. Compared with chip‑removal machining, it can boost productivity by several times, even tens of times, while also reducing material consumption and facilitating automated production.