There are a variety of materials for the production of press brake dies, including steel, cemented carbide, steel bonded cemented carbide, zinc based alloy, low melting point alloy, aluminum bronze, polymer materials and so on.
At present, most of the materials for manufacturing stamping bending machine dies are steel.
The commonly used types of press brake tools materials are: carbon tool steel, low alloy tool steel, high carbon and high chromium or medium chromium tool steel, medium carbon alloy steel, high speed steel, matrix steel, cemented carbide, steel bonded cemented carbide, etc.
In the post below, we will analyze several material types of press brake dies.
Carbon tool steel
T8A, T10A and other carbon tool steels are widely used in press brake toolings, which have the advantages of good processing performance and low price.
However, the hardenability and red hardness are poor, the heat treatment deformation is large, and the bearing capacity is low.
Low alloy tool steel
Low alloy tool steel is based on carbon tool steel with an appropriate amount of alloy elements.
Compared with carbon tool steel, the quenching deformation and cracking tendency are reduced, the hardenability and wear resistance of the steel are improved.
Low alloy steels used for manufacturing press brake dies include CrWMn, 9Mn2V, 7CrSiMnMoV (code CH-1), 6CrNiSiMnMoV (code GD), etc.
High carbon and high chromium tool steel
The commonly used high carbon and high chromium tool steels are Cr12, Cr12MoV and Cr12Mo1V1 (code D2).
They have good hardenability and wear resistance. The heat treatment deformation is very small. They are high wear-resistant micro deformation press brake die steel, and their bearing capacity is second only to high-speed steel.
However, the carbide segregation is serious, so repeated upsetting and drawing (axial upsetting and radial drawing) must be carried out to reduce the heterogeneity of carbide and improve the service performance.
High carbon medium chromium tool steel
High carbon medium chromium tool steels used for bending machine dies include Cr4W2MoV, Cr6WV, Cr5MoV, etc. They have low chromium content, less eutectic carbides, uniform carbide distribution, small heat treatment deformation, good hardenability and dimensional stability.
Compared with high carbon and high chromium steel with relatively serious carbide segregation, the properties are improved.
High speed steel
High speed steel has the highest hardness, wear resistance and compressive strength in press brake die steel, and its bearing capacity is very high.
W18Cr4V (code 8-4-1), W6Mo5 and Cr4V2 (code 6-5-4-2, American grade M2) with less tungsten and 6W6Mo5 Cr4v (code 6W6 or low carbon M2) developed to improve toughness are commonly used in press brake punches and dies.
High speed steel also needs to be forged to improve its carbide distribution.
In order to improve the properties of high speed steel, a small amount of other elements are added to the basic composition of high speed steel and the carbon content is appropriately increased or decreased. Such steel is collectively referred to as base steel.
They not only have the characteristics of high-speed steel and have certain wear resistance and hardness, but also have better fatigue strength and toughness than high-speed steel. They are high-strength and toughness cold work bending machine die steel, but the material cost is lower than high-speed steel.
The matrix steels commonly used in press brake dies include 6Cr4W3Mo2VNB (code 65Nb), 7Cr7Mo2V2Si (code LD), 5Cr4Mo3SiMnVAL (code 012AL), etc.
Cemented carbide and steel bonded cemented carbide
The hardness and wear resistance of cemented carbide are higher than any other kind of bending machine die steel, but the bending strength and toughness are poor.
The cemented carbide used as the bending machine die is tungsten cobalt. For the bending machine die with low impact and high wear resistance, the cemented carbide with low cobalt content can be selected.
For bending machine dies with high impact, cemented carbide with high cobalt content can be selected.
Steel bonded cemented carbide is sintered by powder metallurgy with iron powder added with a small amount of alloy element powder (such as chromium, molybdenum, tungsten, vanadium, etc.) as binder and titanium carbide or tungsten carbide as hard phase.
The matrix of steel bonded cemented carbide is steel, which overcomes the shortcomings of poor toughness and difficult processing of cemented carbide. It can be cut, welded, forged and heat treated.
Steel bonded cemented carbide contains a lot of carbides. Although its hardness and wear resistance are lower than that of cemented carbide, it is still higher than other steel grades.
After quenching and tempering, the hardness can reach 68 ~ 73 HRC.
The material used for the bending machine die belongs to the cold bending machine die steel, which is the press brake die steel with large application, wide application and the most types.
The main performance requirements are strength, toughness and wear resistance.
At present, the development trend of cold work bending machine die steel is based on the properties of high alloy steel D2 (equivalent to Cr12MoV in China), which is divided into two branches: one is to reduce the carbon content and alloy element content, improve the uniformity of carbide distribution in steel, and highlight the improvement of the toughness of bending machine die, such as 8CrMo2V2Si of American vanadium alloy steel company and DC53 (Cr8Mo2SiV) of Daido Steel in Japan.
The other is powder high-speed steel developed to improve wear resistance and adapt to high-speed, automatic and mass production, such as 320CrVMo13 in Germany, etc.
The above is about the materials of press brake dies. If you just need to buy a set of press brake punches and dies, please contact us for the latest quotation.