Hot Forging FAQ – Kobayashi Tools
Frequently Asked Questions
“What makes forged blades so different from casting blades or blanking machined blades? Since those look the same, I don’t understand the difference.”
Answer: The strength of the blade is completely different. We produce high-strength, high-toughness and light blades by hot forging. In addition, the material is high-grade specialized tool steels so that the sharpness is excellent and that has a long life.
The superiority is come from the difference of the method.
- Hot Forging: When materials are heated, products are pressed by high-pressure.
- Lost wax: Pouring liquid metal into a mold.
- Blanking: Scraping from a plate-like metal.
Each method has its pros and cons. The chart below shows the comparison of 3 methods.
<Comparison of Hot Forged, lost wax and blanking machined blades>
|Hot forging blades||Lost wax blades||Blanking machined blades|
|Strength||◎||High pressure makes structure dense and the blade becomes strong.||△||There is a cavity and the metal density poor.||〇||There is a variation depending on the material.|
|Toughness||◎||Repeated bending stress is excellent.||△||Repeated bending stress is weak.||△||Repeated bending stress is weak.|
|Thinning||◎||Products can be thinned by high pressure.||△||Not suitable because the strength is lost.||〇||There is a variation depending on the material.|
|Preciseness||◎||Excellent||〇||Good||◎||High-precision machinning is possible by cutting machines.|
|Lightness||◎||Excellent||△||Thickness is necessary to a certain degree.||〇||There is a variation depending on the material.|
|Cost||〇||Relatively lower cost||〇||Relatively lower cost||◎||There is a variation depending on the materials.|
“A good cable cutter” for users is good for sharpness, hard to break, as well as lightweight and compact, easy to use even in narrow places. Although it is important to choose the optimum method according to purpose and application, our hot forged blades are manufactured aiming at the ideal shape that the users desire.