Bending machine has become one of the most popular metal forming machine tools, Manhattan

In forging machinery, bending machines have become one of the most popular metal forming machine tools. Its application scope covers almost every industrial field such as aviation, shipbuilding, railway, metallurgy, instrumentation, textile, electronics, etc. Its use is so wide that it is no wonder the foreign nickname for the bending machine is “Maid of all work”, which means “the most capable maid”.

This book is compiled by the author based on years of information translation work and their experience in designing and managing bending machine production. It provides an overview of various structures, processing types, safety protection measures, molds, CNC devices, cutting methods, production status and development trends of bending machines in different countries. It can be used as a reference for technicians and workers who manufacture, use, and maintain bending machines, teachers and students engaged in teaching forging machinery, as well as consulting service personnel, sales personnel, and others.

The mechanical industry is developing rapidly, and information knowledge is growing rapidly. The content of this book needs to be continuously enriched. The author’s accumulated materials are difficult to perfect, and their experience is also insufficient. It is inevitable that there are errors and inappropriate aspects in the book. We sincerely hope that readers can correct them more.

1、 Early structure of bending machine

Early designed bending machines used mechanical flywheel transmission mechanisms and clutch brake control systems, with bending force obtained through the energy of the flywheel. Their structural features are similar to those of motorized and press machines.

Before adopting pneumatic clutch braking, these early designed bending machines controlled the coupling mechanism between the clutch and brake through a pedal. The most commonly used structures in various applications are belt brakes and cone clutches.

In the past, there were often many accidents caused by brake belt breakage, clutch blockage, and other reasons in these old-fashioned structures, so people have put a lot of effort into modifying these machine tools.

The use of a ‘sliding’ clutch by the operator to control the bending speed will increase the wear of the clutch and cause a large amount of debris to accumulate on the surface of the flywheel and clutch.

A certain amount of debris can cause the clutch cone to tightly adhere. In this way, the slider will continue to move up and down until all the energy of the flywheel is released.

Due to the mechanical interlocking structure between the brake and clutch, when the clutch is tightened, the brake will automatically disengage

Brake band breakage is also a dangerous phenomenon that often occurs in the above-mentioned structures, which is often caused by excessive adjustment of the brake.

This type of brake structure will experience a “curling” effect during operation, resulting in significant stress. Long term excessive operation without frequent replacement of lining materials will inevitably cause excessive fatigue of the brake band, ultimately leading to damage.

In recent years, some people have attempted to use an auxiliary brake to increase braking effect, which is impractical. For bending machines, this is a dangerous and outdated method. Methods similar to auxiliary brakes are not feasible

There is currently an authoritative view that all the above-mentioned structures are broken