What is the hardness of the mold steel? There is also a certain link between the hardness of the mold steel and the cold forming properties of the material, cutting processability, weldability, etc., which can be used as a reference for the formulation of the processing technology. So, what are the major categories of mold steel?
Main classification of mold steel
For the use of the mold, the use of the mold is very wide, and the working conditions of the various molds are very different. Therefore, a wide range of materials are used for the mold, and the mold steel is the most widely used mold material. From general carbon structural steels, carbon tool steels, alloy structural steels, alloy tool steels, spring steels, high-speed tool steels, stainless heat-resistant steels, to martensitic-aged steels and powdered high-speed steels required for special molds, Powder high alloy die steel. Die steel can be divided into three categories according to the purpose of cold die steel, hot die steel and plastic die steel
1, cold work mold
Cold work die steel is mainly used to make a die that press-forms a workpiece in a cold state. Such as: cold blanking dies, cold stamping dies, cold drawing dies, imprinting dies, cold extruding dies, thread pressing dies and powder pressing dies. The scope of cold work die steel is very wide, ranging from various carbon tool steels, alloy tool steels, high speed tool steels to powdered high speed tool steels and powdered high alloy die steels. Cold work die steel is a vacuum degassed refined steel, pure in the endogenous, good machinability, significantly improved cutting, good hardenability, air quenching hard quenching does not occur, excellent wear resistance, good toughness, available Made of stainless steel and high hardness material stamping die.
2, hot work die
Hot work die steel is mainly used to make the die that presses the work under high temperature conditions. Such as: hot forging die, hot extrusion die, die-casting die, hot die forging die. Commonly used hot work die steels include alloy steels with medium and high carbon content added with Cr, W, Mo, V and other alloying elements; hot die steels with special requirements are sometimes made of high-alloy austenitic heat-resistant die steels. .
3, plastic mold
Due to the variety of plastics, the requirements for plastic products vary greatly, and various performance requirements are also put forward for the materials used to make plastic molds. Therefore, many industrially developed countries have formed a wide range of plastic mold steel series. Including carbon structural steel, carburizing plastic mold steel, pre-hardened plastic mold steel, aging hardening plastic mold steel, corrosion-resistant plastic mold steel, easy-cut plastic mold steel, overall hardened plastic mold steel, martensite Aging steel and plastic mold steel for mirror polishing.
What is the hardness of the mold steel
The hardness of die steel is not mandatory, nor is it a fixed value. Therefore, according to the specific requirements to determine the hardness of the mold steel.
The hardness of several commonly used mold steels is as follows:
738 : 28-32HRC;718 : 28-32HRC
S136 : 28-30HRC;NAK80 : 38-41HRC
S50C : 18-21HRC;P20 : 28-30HRC
Die steel is used to make cold die, hot forging die, die casting die and other steel. Moulds are the main processing tools for manufacturing parts in industrial sectors such as machinery manufacturing, radio meters, motors, and electrical appliances. The quality of the mold directly affects the quality of the pressure processing process, the precision production of the product, and the production cost. The quality and service life of the mold, in addition to reasonable structural design and machining accuracy, are mainly affected by the mold material and heat treatment.
Die steel future development trend
The proportion of high school and low end produced by China's mold industry is extremely unbalanced, which is very unfavorable to the development of China's mold industry. As the downstream industries, especially the automotive industry, rely heavily on the key and core molds for import, a series of key and core injection molding products required by related host products are mainly provided by these internationally renowned mold companies. It is imperative to accelerate the pace of structural adjustment, develop high-end market segments, and synchronize with the international market. How to synchronize with the international market? China's mold industry needs to speed up structural adjustment while improving the level of technology.
Compared with the past, China's mold technology level has greatly improved, but the domestic mold industry production of high school and low-end ratio is extremely uneven, which is very detrimental to the development of China's mold industry. Despite the past few years, the structure and system of China's mold industry have made great changes, mainly in the middle and high-grade molds, large-scale, sophisticated, complex, long life. However, due to the excessive demand for medium- and low-grade molds in China, the self-provisioning rate for medium-to-high-end molds is less than 60%. It is not difficult to see that the irrationality among them.
They mainly show in the following aspects:
First, mold steel and other constraints;
Second, the level of standardization needs to be improved;
Third, high-end mold personnel urgently need to cultivate;
Fourth, speed up the pace of mold product structure adjustment;
Fifth, increase investment to strengthen innovation capabilities;
Sixth, to promote the joint reorganization of mold enterprises;
Seventh, overseas market development needs to be deepened.
Some experts pointed out that in addition to continuing to increase production capacity in the future, China's mold industry must focus on internal structural adjustment and technological development. It mainly focuses on the adjustment of the enterprise structure to the specialization, the development of the product structure towards middle and high-end molds, the improvement of the import and export structure, the analysis and structural improvement of the molding of middle-to-high-end automotive panels, multi-functional composite molds and composite machining, and laser technology in the mold design and manufacturing On the application, high-speed cutting, ultra-precision machining and polishing technology, the development of information technology.
Editor's summary: The relevant information on the major classification of mold steel and the hardness of mold steel is introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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