How Knifes Are Made - Modern Knife Making with Robot Technology | Inside The Making Factory

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Sharp knives are crucial in everything from food processing to manufacturing and packaging. There’s a wide variety of knife blade material, however, there are two main characteristics that go into keeping knives sharp. One is the blade material hardness. The other is knife material toughness.
These are two separate issues and need to balance to produce excellent machine knife blades that give long service. It’s the combination of hardness and toughness that builds great blades.

Hardness refers to the knife blade density. In the machine knife blade industry, we measure metal hardness on the Rockwell C scale. Generally, the higher the Rockwell C number is, the denser and therefore harder the material is. But just because a certain metal has a high Rockwell scale doesn’t mean the material is durable or tough. Many high-scale metals easily erode and quickly lose their edge.

Toughness refers to how well the knife blade resists erosion and abrasion. We measure a metal’s toughness by its Transverse Rupture Strength (TRS). In metal science, Young’s modulus of elasticity is the physical principle or guidance that scores a metal’s toughness. The higher a metal’s TRS score, the tougher it is.

You’d think that knife blades with high Rockwell C and TRS numbers would be ideal materials. Unfortunately, that’s not possible. TSR and Rockwell scores are inversely proportional. Physical properties dictate that harder metals tend to be brittle and damage easily. Softer metals can turn out to be incredibly tough as they exhibit elasticity that absorbs foreign forces.

Finding the right balance of metal hardness and toughness is what York Saw and Knife customers depend upon. We have a selection of proven blade metals and rely on those as backbones for our manufacturing process. Still, we often get customers shipping us their own machine knife blades to replicate or reproduce.

The first thing we do is analyze the metal and determine its characteristics to reverse engineer it. Then we follow a simple six-step process in manufacturing machine knives. We use this process regardless if we’re producing stock knives or building custom applications.











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