In the dynamic realm of stamping production, the integration of feeding machines has undeniably revolutionized the automation of material feed in stamping equipment. However, the prolonged operation of these feeding machines may introduce a degree of cumulative error over time. To ensure optimal precision in stamping processes, the judicious introduction of positive guiding pins becomes imperative. This crucial step requires the material to be in a state of relaxation for accurate rectification of its position—a phenomenon commonly known as “relaxation” within the stamping industry.

Types of NC Feeding Machines: Pneumatic vs. Mechanical

NC feeding machines, classified by their relaxation mechanisms, predominantly fall into two categories: pneumatic NC feeding machines and mechanical NC feeding machines. The choice between these machines hinges on the specific requirements of products and molds, each demanding distinct relaxation methods.

Mechanical NC Feeding Machines: Speed and Short Strides

Mechanical NC feeding machines excel in quick relaxation and short relaxation distances, making them particularly well-suited for high-speed feeding with short strides. These machines operate efficiently, providing precision in stamping processes.

Pneumatic NC Feeding Machines: Versatility for Various Requirements

On the other hand, pneumatic NC feeding machines, not constrained by stroke limitations, cater to prolonged relaxation requirements. They shine, especially when dealing with large molds and non-high-speed stamping processes.

The Fundamental Principle of NC Feeding Machine Relaxation

The relaxation process in NC feeding machines involves the initial relaxation of the feeding rollers. The lower feeding roller, affixed in position, executes rotational movements controlled by program-controlled servo motors and synchronous belts. This bidirectional rotation achieves the objectives of feeding and material retraction.

The entire upper roller assembly, fixed onto the frame by a rotating shaft, is tensioned by reset springs to press the upper and lower rollers tightly against the material. During relaxation, the upper roller assembly lifts, separating the upper and lower rollers. This fulfills the relaxation function, facilitating material entry, and aiding die guidance during stamping. Importantly, the rotating shaft of the NC feeding machine is an eccentric shaft, allowing for adjustment to accommodate varying material thicknesses.

Mechanical NC Feeding Machine Relaxation Process

In mechanical NC feeding machines, the relaxation process involves the installation of a relaxation rod on the press slide. As the slide moves up and down, the relaxation rod engages the mechanical relaxation support. The rotating shaft in the mechanical relaxation support causes the upper roller assembly to move upward, separating the upper and lower rollers for relaxation.

Upon the slide’s upward movement, the mechanical relaxation support gradually resets. The spring-fixed plate of the roller assembly is pulled to the left by the reset spring, causing the entire upper roller assembly to move downward. This re-engages the upper and lower rollers, facilitating the feeding process.

Pneumatic Relaxation in NC Feeding Machines

Contrastingly, the pneumatic relaxation process in NC feeding machines is controlled by a PLC program. The program signal operates pneumatic solenoid valves to actuate the pneumatic relaxation cylinder, pulling the entire upper roller assembly upward. This action separates the upper and lower rollers, achieving pneumatic relaxation.

Customization for Optimal Performance

Integrated pneumatic and mechanical relaxation NC feeding machines offer customization to meet specific client needs. In pneumatic relaxation setups, the installation of a relaxation rod is unnecessary. For mechanical relaxation, the relaxation rod is installed, and the pneumatic relaxation function can be deactivated through the 7-inch Weinview touchscreen. When both mechanical and pneumatic relaxations operate simultaneously, dual relaxation functions are achieved—enabling both high-speed and prolonged relaxations. The intricate design provides practical convenience, ensuring precision and efficiency in stamping automation.

Stamping Automation
Stamping Automation