Soft magnetic alloy component hot extrusion die and preparation method thereof

Abstract

The invention discloses a hot stamping mold for a soft magnetic alloy element and a preparation method thereof, wherein the mold includes an upper mold base and a lower mold base, and the upper mold base and the lower mold base are provided with mutually matching convex molds and concave molds, and the concave mold Including the lower mold body and the lower mold core, the punch includes the upper mold body and the upper mold core, the lower mold body has a graphite coating, and the outer surface of the graphite coating has an induction coil; the lower mold body corresponds to the position of the lower mold core, And there are cooling chambers in the position facing the upper mold core in the upper mold body, and the corresponding cooling chambers on the lower mold body and the upper mold body are equipped with inlets and outlets communicating with them. The preparation method mainly adopts the above-mentioned molds, through structural cooperation such as rapid heating and cooling, combined with measures such as heat preservation and pressure preservation. It can effectively increase the heating rate, cool down in time and ensure a stable cooling gradient, which can meet the preparation of complex structural components, and at the same time help to ensure the continuity of the internal grain structure of the finished soft magnetic alloy component, maintain good magnetic permeability, and improve the quality of the finished product .

Description

technical field [0001] The invention relates to the field of mold structures, in particular to a hot stamping mold for a soft magnetic alloy element and a preparation method thereof. Background technique [0002] Soft magnetic alloy is a kind of alloy with high magnetic permeability and low coercive force in weak magnetic field. It is widely used in radio electronics industry, precision instrumentation, remote control and automatic control system. It is mainly used for energy Conversion and information processing are two major aspects, which are an important material in the national economy. [0003] Usually it needs to be stamped or extruded to process it into the required component shape, and for some micro-shaped components, a combination of stamping and extrusion is used, which generally includes raw material heating, punching, holding pressure and grasping cooling At the same time, it is required that during the processing process, the heating process should be rapid a...

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Problems solved by technology

[0003] Usually it needs to be stamped or extruded to process it into the required component shape, and for some micro-shaped components, a combination of stamping and extrusion is used, which generally includes raw material heating, punching, holding pressure and grasping cooling At the same time, it is required that during the processing process, the heating process should be rapid and stable, and the cooling gradient should be uniform or controllable during the cooling process, otherwise it is very likely that the internal grain structure of the component will break, the continuity will be poor, and the magnetic properties will also attenuate accordingly. The quality of the finished product is greatly reduced. In the existing process, the raw material is usually heated externally, and then placed on the mold for extrusion. After the pressure is completed, it is grabbed to other places for cooling. In the above steps, because The heating is outside the mold, so when the heating is completed and placed in the mold, its temperature will change relatively, which may not meet the processing requirements. Secondly, during the pressure holding process, the finished product is actually in a state of natural cooling, and the pressure holding is completed. Secondary cooling after leaving may lead to fracture of grain structure caused by uneven heating and cooling

[0004] In addition, the processing of soft magnetic alloy components such as Fe-Ni system and Fe-Co system usually adopts two methods of powder sintering and cold processing. If powder sintering is used, although the forming is easier, the internal porosity of the material is relatively large. , affecting the soft magnetic properties of the material

However, the overall cold forming has disadvantages such as large waste of raw materials, low production efficiency, cracking of blanks, reduction of magnetic permeability due to processing stress, and low product qualification rate.

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