What is the function of a cold heading machine?

A cold heading machine is a highly efficient manufacturing device that applies pressure to metal blanks at room temperature, inducing plastic deformation through a die to produce parts of various shapes and dimensions. Its core functions are manifested in the following aspects:

I. Efficient Mass Production of Metal Parts

Multi-station continuous processing

Cold heading machines, with their multi-station design—including material cutting, head upsetting, accumulation, forming, chamfering, and thread rolling—can complete all or most of a part’s machining operations in a single clamping. For example, when producing bolts, a single cold heading machine can sequentially perform material cutting, head upsetting, and thread rolling, eliminating the need for multiple clamps or workpiece transfers and significantly boosting production efficiency.

High-speed operation capability

The main motor employs variable-frequency drive technology, achieving rotational speeds of several hundred revolutions per minute, with some models exceeding 1,000 rpm. When paired with an automated feeding system, it enables high‑efficiency production rates of 80 to 240 parts per minute—far surpassing those of conventional turning or forging processes.

High material utilization rate

During cold working, metals undergo plastic deformation, and material utilization typically reaches 80%–90%, significantly higher than in cutting processes (approximately 50%–70%). For example, when manufacturing an M12 bolt, the cold forging process requires only about 11.5 grams of steel, whereas the turning process demands roughly 15 grams, resulting in a 23% reduction in material costs.

II. Enhancing Part Performance and Quality

Cold work hardening effect

When metals undergo plastic deformation at room temperature, grain refinement and an increase in dislocation density lead to a significant enhancement in material strength, hardness, and wear resistance. For example, the tensile strength of bolts after cold heading can improve by 30%–50%, meeting the requirements for high‑strength fasteners.

High-precision machining capability

Digital Control: Equipped with a microcomputer control system and a human–machine interface (HMI), it enables real-time adjustment of processing parameters—such as punch angle, rotational speed, and die height—with an accuracy of ±0.01 mm.

Precision guiding system: Employs a multi‑guide‑post design, paired with high‑wear‑resistant alloy copper bushings, to ensure smooth, backlash‑free slider motion and minimize machining errors.

Excellent surface quality

The cold forging process eliminates burrs, flash, and heat-affected zones that typically arise from cutting, resulting in a surface finish as smooth as Ra 3.2 μm or better. This reduces the need for subsequent grinding or polishing operations, thereby lowering production costs.

III. Adapting to Diverse Production Needs

Multi-material processing capability

It can process a variety of metal materials, including steel, aluminum, copper, brass, and stainless steel, meeting the needs of different industries. For example:

Automotive industry: Produces high-strength fasteners such as engine bolts and connecting‑rod bolts.

Construction industry: manufacturing corrosion-resistant components such as anchor bolts and steel structure connectors.

Electronics industry: machining precision components such as miniature screws and connectors.

Complex Shape Forming

Through mold design, it is possible to manufacture parts with complex features such as heads, threads, grooves, and holes. For example:

Hex head bolt: The hexagonal head is formed in a single operation at the heading station, eliminating the need for subsequent machining.

Special-shaped nut: Utilizes a split-type mold to achieve precise machining of asymmetric geometries.

Flexible specification adjustments

A wide range of tonnages—such as 30 t, 60 t, and 100 t—and model options are available; higher tonnage corresponds to greater processing capacity. Users can flexibly configure the equipment based on part dimensions, material thickness, and production volume.

IV. Reducing Production Costs and Lead Times

Energy-saving and environmentally friendly design

Low energy consumption: Equipped with a pneumatic clutch brake, it reduces motor idling time, lowering power consumption by 20%–30%.

Fully enclosed production: Certain models feature a sealed design that reduces noise and dust emissions, meeting green manufacturing standards.

Automation Integration

It supports synchronized integration with equipment such as feeders, levelers, and robotic arms, enabling fully automated production across the entire process. For example, when paired with a high-speed roller feeder, it can increase the feeding speed to over 10 meters per minute, minimizing manual intervention and reducing labor costs.

Easy maintenance

Modular Design: Key components, such as the crankshaft, engine block, and impact connecting rod, are joined using high‑wear‑resistant alloy copper bearings, providing high load capacity and extended service life.

Fault self‑diagnosis function: Equipped with a fault detector and safety protection devices, the equipment automatically shuts down and triggers an alarm in case of abnormalities, thereby minimizing downtime.

V. Typical Application Scenarios

Fastener manufacturing

It manufactures standard fasteners such as bolts, nuts, screws, and washers, which account for more than 60% of the cold forging press market. For example, automotive engines require hundreds of different specifications of cold-forged bolts to ensure reliable connections.

Machining of irregularly shaped parts

We manufacture non-standard components such as shafts, sleeves, and valve bodies, achieving complex geometries in a single forming operation through custom-designed dies. For example, cold upsetting is well suited for producing profiled parts like bicycle bottom brackets and motorcycle chain pins.

Micro-component manufacturing

We machine precision components such as miniature screws and connectors with diameters less than 5 mm, meeting the high‑precision, low‑volume production requirements of industries like electronics and medical devices.