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Quenching method of die and manufacture method of die

A mold and mold heating technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve problems such as easy cracks, achieve the effect of suppressing cracks and maintaining toughness

Active Publication Date: 2015-09-23
HITACHI METALS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, since the surface of the mold is also engraved to form the shape of the product (molded product), stress concentrates on the base of the concave or convex steps of the product shape surface of the mold having a complex concave-convex shape. Cracks

Method used

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  • Quenching method of die and manufacture method of die
  • Quenching method of die and manufacture method of die
  • Quenching method of die and manufacture method of die

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Embodiment

[0040] Experimental points

[0041] A 300mm×300mm×300mm square is made of hot-worked tool steel, which is an improved material of JIS-SKD61 in Japan, as a raw material. The entire surface of the block is milled. The martensitic transformation point (Ms point) of this raw material was 285°C. Next, this block was processed to form a concave groove with a depth of 100mm and a width of 50mm corresponding to the product shape surface of the mold, thereby producing a Figure 7 samples for quenching. The corner portion of the groove bottom was processed such that R (radius of curvature) of the corner portion was 1 mmR on one side and 3 mmR on the opposite side. In addition, from the center of the bottom of the groove toward the back of the sample, there are also positions C (that is, the core of the sample) with a depth of 90 mm and positions S (that is, the actual back of the sample) with a depth of 195 mm. central location) forms the insertion hole for the thermocouple that a...

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Abstract

The invention provides a quenching method of a die and a manufacture method of a die which can restrain cracks of product shape surfaces of dies. In the quenching method, a die is heated to the quenching temperature of an austenite area and then cooled, so that the organization of the die is subject to martensite phase transformation. The cooling is performed in such a manner that when the temperature of an area A with the highest temperature of the opposite surface of the product shape surface of the die, namely the back surface of the die, at least passes through the temperature range from martensite phase transformation point to the martensite phase transformation point -70 DEG C, an area B with the highest temperature in the die is made to transfer to the back surface side of the die in part of or all the temperature range. Preferably, when the temperature of the area B passes through the temperature range from the martensite phase transformation point +50 DEG C to the martensite phase transformation point, the area B is cooled at the speed of 3.0 DEG C / min. The invention also provides the manufacture method of a die which is used for tempering of the die quenched with the quenching method of a die.

Description

technical field [0001] The invention relates to a quenching method of a mold and a manufacturing method of the mold. Background technique [0002] In the quenching process of the mold in which the mold is heated to the quenching temperature in the austenite region and then cooled to allow the structure of the mold to undergo a martensitic transformation, the cooling rate of the surface of the mold is usually faster than that of the inside of the mold ( That is to say, the surface of the mold undergoes martensitic transformation before the interior of the mold). Therefore, after the martensitic transformation is first performed on the surface of the mold, the martensitic transformation is carried out later in the mold, so that the surface of the mold that has almost completed the martensitic transformation undergoes thermal contraction as cooling progresses. , on the other hand, phase change expansion takes place inside the mold, thereby causing tensile stress on the surface...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/00
Inventor 西田纯一
Owner HITACHI METALS LTD
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