An automatic chain bending machine automatically performs over 20 actions—including metal wire straightening, feeding, cutting, bending, chain knitting (interlinking), and shaping at room temperature or under heated conditions. It bends wire or bar stock into finished round chain links.

A complete production cycle typically consists of the following steps:

1. Feeding and Clamping

The straightened metal wire is fed into the working position by the feeding device and firmly secured by the clamping mechanism.

2. Bending and Forming

The Pre-bending die, core dies and other cpmponents work together to wrap the wire around the core die into a U shape, and finally close the ends to form an open ring (chain link).

3. Knitting / Interlinking

During the bending process, each newly formed open chain link passes through the previously closed link, achieving automatic chain connection.

4. Discharge Preparation

The formed chain link is taken out and rotated by 90 degrees, ready for the next link to be inserted.

 

Our Products - Hangzhou Polywin Machinery Co., Ltd.

The automatic chain bending machines manufactured by Hangzhou Polywin Machinery Co., Ltd. operate at room temperature (commonly known as cold bending, cold forming) to produce Grade 80 and Grade 100 high strength lifting chains, hoist chains, mining chains, lashing chains, etc., with a diameter ranging from 3 mm to 26 mm. Based on German technology and our own upgrades, our machines are made of high quality materials, offering excellent impact resistance and high wear resistance.

The electrical control system uses a Siemens programmable logic controller (PLC) for precise control, automatically managing the entire process from wire feeding to finished chain output.

All machine operations are executed via control panel pushbuttons. The panel includes a series of practical and efficient controls: variable frequency drive fault alarm, short material protection, core die fault protection, production count display, frequency adjustment, forward/reverse rotation operation, and more. These features make operation more convenient and reliable while improving the machine’s automation level.

This series of machines adopts pneumatic clutch transmission and gear speed change, further enhancing operating efficiency.