Primapress is a professional manufacturer of CNC hydraulic sheet metal press brake bending machines, CNC shearing machines, and CNC rolling machines
The mold of CNC hydraulic sheet metal press brake bending machine, English name PRESS BRAKE YOOL, is widely used in the metal sheet metal processing industry, and is a common tool used by CNC hydraulic sheet metal press brake bending machine to process metal sheet materials.
CNC hydraulic sheet metal press brake bending machine molds can be mainly divided into two categories, one is the upper mold (convex mold) and its accessories, and the other is the lower mold (concave mold) and its accessories. The upper mold components include the upper mold fixture, upper mold, mold handle, mold head, etc. The lower mold components include lower mold, lower mold holder, mold seat, mold clamp, etc. These can all be combined with each other. These all require mold materials for manufacturing.
In the use of CNC hydraulic sheet metal press brake bending machine molds, the upper mold (convex mold) compresses the surface of the sheet metal, while the lower mold (concave mold) restricts the surface of the sheet metal, thereby achieving deformation of the sheet metal and making it the desired shape. During this process, the sheet metal is bent and deformed, the material inside the curved corners is compressed, and the external material of the sheet metal is stretched. Throughout the entire process, mold materials and plates inevitably squeeze and rub against each other, so after prolonged use, mold materials will experience irreversible wear and tear. The contact surface between the mold material and the workpiece of a CNC hydraulic sheet metal press brake bending machine is usually a new surface; The contact pressure is very high, sometimes exceeding the yield strength of the processed material; The contact surface temperature is very high, ranging from 200 ℃ to 500 ℃, with a maximum of 800-1000 ℃. Mold material wear is usually the result of mechanical wear, thermal deformation, and chemical forms combined.
Because of this, when choosing CNC hydraulic sheet metal press brake bending machine mold materials, we need to consider several characteristics: hardness, heat resistance, and wear resistance. We usually choose T8-T12 carbon steel for use, among which T10 is more commonly used, with moderate toughness and good wear resistance. After heat treatment, the highest hardness can reach above 60HRC, and its production cost is relatively low. However, its hardenability is poor and its heat resistance is poor (250 ℃). There are many molds used for ordinary CNC hydraulic sheet metal press brake bending machines. If you need better mold materials, choose 42CrMo high-strength alloy structural steel. 42CrMo belongs to ultra-high strength steel, which has high strength and toughness, good quenching performance, and high fatigue limit and multiple impact resistance after quenching and tempering treatment. It can work below 500 ℃. The hardness after heat treatment is around 45-48HRC, which is more suitable. At present, the majority of CNC hydraulic sheet metal press brake bending machine molds are made of 42CrMo material. Even better is the cold working die steel Cr12MoV, which adds an appropriate amount of alloy elements such as chromium, molybdenum, and vanadium to the material, improving the hardenability and hardenability of the steel, making the comprehensive mechanical properties of the quenched material far superior to other types of steel. It is suitable for various cold stamping dies with large cross-sectional area, complex shapes, and frequent use. The molds manufactured with it have high precision and long lifespan, but the material usage cost is much higher.
With the arrival of the 21st century and the continuous emergence of new materials and processes, some will also be added to CNC hydraulic folding
