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Die steel fracture problem is a common material problem, some material experts found that the raw material quenching treatment can make the die steel less prone to fracture. The presence of severe carbide segregation in the raw material, the lack of timely tempering and inadequate tempering of the quenched workpiece, the presence of excessive residual internal stresses and the superposition of new internal stresses formed during the wire-cutting process lead to wire-cutting cracks. The problem of die steel fracture can be effectively solved by the following release.
1. re-forging of raw materials, multiple double cross-shaped variable upsetting and drawing forging, by four upsetting and four drawing, so that the forging fibre tissue is wavy and symmetrically distributed around the cavity or axis, and quenching using the high temperature residual heat of the last fire, followed by high temperature tempering.
2. the development of an advanced heat treatment process to control the final quenched residual austenite content without exceeding the standard.
3. timely tempering and quenching stress relief after quenching.
4. Appropriately reduce the grinding speed, grinding volume and grinding cooling rate, which can effectively prevent and avoid the formation of grinding cracks.
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Dongguan City, Guangdong Province