The correct selection of the material of the wire drawing die, the reasonable design of the shape and size of the die hole, the reasonable formulation of the mold structure and mold repair process, and the accurate and precise processing of the wire drawing die are all of great significance to the production of steel wire.
1. The material of the wire drawing die core: Due to the constraints of the working conditions of wire drawing, the material of the wire drawing die core not only has high hardness and wear resistance, but also has sufficient strength, toughness and a very smooth working surface. Taking into account the corrosion of various lubricants and coatings, it is required to have low adhesion to the surface of the steel wire, small expansion coefficient and high thermal conductivity, as well as low price and convenient processing. The current steel wire production mainly uses wire drawing dies made of cemented carbide.
2. The characteristics of cemented carbide materials: Cemented carbide is an alloy made of refractory metal hard carbide as aggregate, cobalt as binder, powder metallurgy method, pressure forming and sintering after mixing . The currently used cemented carbides are mainly divided into three categories: tungsten-cobalt, tungsten-cobalt-titanium and tungsten-cobalt-tantalum-titanium. Because the latter two types of alloys are relatively brittle, they are not suitable for use as wire drawing dies. The correct selection of the material of the wire drawing die of the tungsten-cobalt alloy wire drawing die, the proper design of the die hole shape and size, the reasonable formulation of the mold structure and mold repair process, and the accurate and precise processing of the wire drawing die are all of great significance to the production of steel wire.
1. The characteristics of cemented carbide materials: Cemented carbide is an alloy made of refractory metal hard carbide as aggregate, cobalt as binder, powder metallurgy method, pressure forming and sintering after mixing . The currently used cemented carbides are mainly divided into three categories: tungsten-cobalt, tungsten-cobalt-titanium and tungsten-cobalt-tantalum-titanium. Because the latter two types of alloys are relatively brittle, they are not suitable for use as wire drawing dies.
2, Material of wire drawing die core:
Due to the constraints of the working conditions of wire drawing, the material of the wire drawing die core not only has high hardness and wear resistance, but also has sufficient strength (compressive strength and compressive bending strength), toughness and a very smooth working surface. It is necessary to consider factors such as adapting to the corrosion of various lubricants, various coatings, and oxidation including the atmosphere, requiring low adhesion to the steel wire surface, small expansion coefficient and high thermal conductivity, as well as low price and convenient processing. The current steel wire production mainly uses wire drawing dies made of cemented carbide.
(1) Strong polishability and low adhesion. The above mirror surface roughness can be processed, which can not only ensure the drawing quality of the steel wire surface, but also reduce the power consumption during drawing due to its low friction coefficient.
(2) High hardness and good abrasion resistance. The room temperature hardness is generally as high as hra86-93, and some red hardness. The hardness can be maintained under >500℃, and the hardness will be reduced if it is above 500℃. The wear resistance is 15-20 times higher than that of high-speed tool steel (stainless steel), which can ensure the accuracy of steel wire size under long-term drawing working conditions.
(3) Good corrosion resistance. The mold will not be oxidized and corroded during storage, cleaning and grinding and repair, and it can work continuously for a long time.
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