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What are the manufacturing materials of stamping molds?

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Among the four major processes, stamping is very important. In the stamping process, the quality of the stamping die is a very important process. It often stops production due to the failure of the blanking die, which affects the quality of the blanking parts and the production cycle. In addition to the process of stamping die production, the material is also a very important part, and the stamping die material is the key to prolonging its service life. The following is the editor of Zhejiang Baifudu Electromechanical to introduce some common stamping die manufacturing materials. .

The materials for producing stamping parts include high-speed steel, carbon tool steel, alloy tool steel, cemented carbide, steel-bonded cemented carbide, zinc-based alloy, low melting point alloy, aluminum bronze, polymer materials, etc. At present, many materials are used for stamping dies. for steel.

1. Carbon tool steel

Carbon tool steels such as T8A and T10A are used for stamping dies, which are characterized by good workability and low price; but poor hardenability and red hardness, large heat treatment deformation, and low bearing capacity.

2. Low alloy steel

Low-alloy steel is based on carbon tool steel, adding an appropriate amount of alloying elements. Compared with carbon tool steel, the quenching deformation tendency is small, the hardenability is good, and the wear resistance after quenching is good. The low alloy steel used for stamping parts is CrWMn.9Mn2V. 7CrSiMnMoV (code CH-1). 6CrNiSiMnMoV (code GD), etc.

3. High carbon-high chromium tool steel

Cr12 and Cr12MoV. Cr12Mo1V1 (code D2) is a common high carbon and high chromium tool steel with good hardening properties and minimal heat treatment deformation. They are highly wear-resistant, slightly deformed die steels, second only to high-speed steels in bearing capacity. But the carbide segregation is serious and must be upsetting repeatedly (axial upsetting). Through forging, the non-uniformity of carbides can be reduced and the service performance can be improved.

4. Medium chromium high carbon tool steel.

High-carbon medium-chromium tool steels are mainly Cr4W2MoV, Cr6WV ​​and other Cr5MoV, etc., which have low chromium content, uniform carbide distribution, small heat treatment deformation, good hardenability, and good processing dimensional stability. The results show that the performance is improved compared with the high carbon and high chromium steel with a larger degree of carbide segregation.

5. High-speed steel

Among high-speed steels, it has the highest hardness, wear resistance, high compressive strength and high bearing capacity. W18Cr4V (code 8-4-1), tungsten W6Mo5Cr4V2 (code 6-5-4-2), Japanese trademark SKH51, American brand M2) and 6W6Mo5Cr4V (code 6W6, also known as low carbon M2) for toughness enhancement .

6. Basic steel

Adding a small amount of other elements to the basic composition of high-speed steel and appropriately increasing the carbon content can improve the performance of the steel. Such steels are collectively referred to as base steels. It not only has high wear resistance and hardness, but also has better fatigue strength and toughness than high-speed steel. It is a high toughness cold work die steel with lower material cost than high speed steel. The basic steels commonly used in stamping dies are 6Cr4W3Mo2VNb (code 65Nb), 7Cr7Mo2V2Si (code LD), 5Cr4Mo3SiMnVal (code 012Al), etc.

7. Carbide and steel bonded cemented carbide.

Carbonization has higher hardness and wear resistance, but poor bending strength and toughness. Tungsten-cobalt alloys are used as cemented carbides for molds. For molds with low impact and high wear resistance, cemented carbide with low cobalt content can be selected. For impact dies, carbides with high cobalt content can be used.

Steel-bonded cemented carbide is sintered by powder metallurgy with a small amount of alloying element powder (such as chromium, molybdenum, tungsten, vanadium, etc.) as the binder and titanium carbide or tungsten carbide as the hard phase. Steel-bonded cemented carbide is based on steel, which overcomes the disadvantages of poor toughness and difficult processing of cemented carbide, and can be cut, welded, forged and heat treated. Steel-bonded cemented carbides contain more carbides. The hardness and wear resistance of steel-bonded cemented carbide after quenching are poor, but the hardness is high, up to 68-73HRC.

The above is the content related to stamping die manufacturing materials. The manufacturing cost of stamping dies is high, and the general die cost accounts for 1/4-1/5 of the total cost of stamping parts. The cost of a trimming is more than 70% of the original mold cost, or the mold life is close. If the mold repair process is too complicated, the mold repair cost is too high, and the difficulty is high, the maintenance cycle will be too long, which will seriously affect the normal production of stamping parts. Hope the above content can be helpful to readers.

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