Introduction: The Importance of Press Feeders in Stamping Processes

Press feeders play a critical role in the automated stamping process of coiled materials, as their efficient operation directly impacts product quality. However, these machines can experience malfunctions, such as material scratching, which leads to increased scrap production and potential mold damage. To minimize downtime and maintain product quality, it’s essential to identify the causes of material scratching and implement appropriate solutions.

Understanding the Causes of Material Scratching in Press Feeders

Material scratching in press feeders typically occurs due to three main factors:

  1. Excessive Clamping Force: Handling thin or lower-strength materials (e.g., sheet metal, copper, aluminum) with too much clamping force can cause indentations on the material during the release and clamping process.
  2. Foreign Object Contamination: Debris, such as material fragments, oxidation, or residues, can stick to feeder rollers and transfer their shape onto the material as the roller rotates, causing intermittent pitting.
  3. Overfeeding Issues: If the first two causes are ruled out, the root cause of scratching might not originate from the feeder itself. Observe the material strip’s movement from the feeder outlet to the mold or finished product area to determine if any specific part contacts and subsequently scratches the material during the stamping process.

Tailored Solutions for Different Types of Feeders

To address material scratching, implement the following solutions based on the type of feeder in use:

For Air Automatic Feeders

  1. Foreign Object-Induced Scratching: Stop the machine, inspect the fixedclamp and moving clamp of the air automatic feeder for debris or foreign objects. Clean them to resolve the issue.
  1. Scratching Due to Thin Materials (common with copper or aluminum): Apply a protective film to the air automatic feeder’s material support rack, fixed clamp, and moving clamp to prevent scratching.

For Roller Feeders

  1. Incorrect Material Thickness Adjustment and Excessive Spring Pressure: Stop the machine, verify if the roller feeder’s material thickness has been adjusted according to the actual material thickness, and reduce the pressure exerted by the spring.
  2. Foreign Objects on Feeder Rollers: Wipe and clean the rollers to resolve the issue.

For NC Servo Feeders

  1. Excessive Cylinder Pressure Causing Material Damage: Adjust the cylinder pressure according to material thickness using the pressure adjustment handle of the three-point combination. When handling thin materials, reduce the cylinder pressure of the three-point combination accordingly.
  2. Foreign Objects on Feeder Rollers: Wipe and clean the rollers to resolve the issue.

Seeking Professional Assistance

If the aforementioned solutions do not resolve the material scratching issue, contact a professional or the feeder’s manufacturer for further assistance. They can dispatch experienced personnel to investigate the problem, conduct research, and provide a suitable solution to eliminate material scratching and ensure the smooth operation of your press feeder.

roller feeder
roller feeder