Comparison of lifespan between circular punch and irregular punch

2026-03-09 17:14:20

The lifespan of the punch is directly related to production efficiency and consumable costs. No one wants to change the punch frequently, which not only delays production but also increases expenses. The lifespan of circular and irregular punch heads also varies greatly, and the core is still related to the processing difficulty and structure.

Let's talk about circular punch heads first. They generally have a long lifespan and are very stable. Why? Due to the symmetrical structure and uniform force of the circular punch, the punching force can be evenly distributed throughout the punch tip and rod during stamping, without local stress concentration, making it less prone to needle breakage and wear.

The circular punch produced by Jingbo is made of high-quality high-speed steel or hard alloy, and then strengthened by nitriding, titanium plating and other treatments. Under normal working conditions, it can punch thin materials (such as copper foil and aluminum foil) with a lifespan of tens of thousands or even hundreds of thousands of times; Even for stamping thick materials (such as steel plates), the service life can reach thousands to tens of thousands of times, and the wear is uniform. The replacement cycle is very stable, and there is no need to frequently stop and replace the punch, which can ensure production efficiency.

Looking at the irregular punch, its lifespan is relatively unstable and generally shorter than that of a circular punch. There are two core reasons: firstly, the structure of the irregular punch is asymmetric. During stamping, the punching force will be concentrated on the edges, cutting edges, and other parts of the irregular shape. If these parts are subjected to excessive force, they are prone to breakage and wear, eSPECIALly for some sharp and thin edged irregular punch heads, which have a shorter lifespan; The second is that the machining accuracy of the irregular punch requires high precision. Once deviations occur during the machining process, such as uneven cutting edges or burrs on edges and corners, it will exacerbate wear and shorten the service life.

For example, Jingbo encountered a customer who had previously sought out a small manufacturer to process irregular punch heads. Due to inaccurate edge processing and uneven force distribution, the punch head broke after less than a thousand stamping cycles, causing frequent replacement and delaying production progress. Later, we found Jingbo and optimized the structure of the irregular punch, slightly chamfered the sharp corners, optimized the geometric design of the cutting edge, and selected high-quality hard alloy. The machining accuracy was strictly controlled, and the punch life was directly increased to thousands of times, greatly reducing the frequency of replacement.

It should be emphasized here that the lifespan of the irregular punch is not only related to the machining accuracy, but also to the usage scenario. If it is stamping thin or soft materials, the lifespan of the irregular punch will be relatively longer; If it is stamping thick or hard materials (such as stainless steel plates), the lifespan of the irregular punch will be significantly shortened. Moreover, the maintenance of irregular punch heads is more complicated, requiring regular polishing of the cutting edge and cleaning of wear marks on the punch surface to extend its service life.