Core principles and advantages of flexible material punching tool outer diameter grinding process

In the precision cutting of flexible materials such as leather, car seat cushion foam, and shoe fabrics, the outer diameter grinding of the punching knife is the core process of the industry. Different from the inner diameter cutting method of hard materials, it is a key process to ensure die-cutting accuracy, product quality, and mold life.

Flexible materials have a soft texture and fibers are prone to pulling and deformation. If an inner diameter grinding blade is used, the blade edge will form an inward angle. During the punching process, the blade not only cannot cut the material vertically, but also squeezes the material inward, which can easily cause problems such as fuzzing, edge collapse, and hole deviation in leather and foam cuts, seriously affecting the appearance and dimensional accuracy of the product, and unable to meet the fine production standards of automotive interiors and high-quality shoe materials.

Grinding the outer diameter with a punching knife can create a high-quality blade structure that is sharp on the outside and straight on the inside. During punching, the blade cuts the material fibers vertically without lateral compression or pulling, eliminating defects such as fuzzing, tearing, and deformation from the root, ensuring precise and uniform hole positions and irregular cutting sizes. At the same time, the outer wall of the blade after precision grinding of the outer diameter is smooth and even, and the demolding after punching is smooth without sticking or pulling materials, effectively improving the stability and qualification rate of continuous mass production.

In addition, the outer diameter grinding process makes the blade root structure thicker, greatly improving the rigidity and compressive wear resistance of the blade edge. It can evenly disperse the stress during the stamping process, effectively reduce the rate of tool passivation, chipping, and wear, significantly extend the service life of the mold, help downstream enterprises reduce tool changing downtime, reduce consumables and production costs, and adapt to the high-frequency and high-precision cutting production needs of various flexible materials.