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Member for die casting and process for manufacturing same, sleeve for die casting, and die casting equipment

A manufacturing method and component technology, applied in the field of die-casting devices, can solve the problems of shortened service life of casting components and increased repair frequency of casting components, and achieve the effect of excellent melting loss resistance

Active Publication Date: 2014-12-10
HITACHI METALS TOOL STEEL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the case of the above-mentioned casting member, when erosion to molten metal significantly progresses during use, the repair frequency of the casting member becomes high, and the life of the casting member also becomes short.

Method used

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  • Member for die casting and process for manufacturing same, sleeve for die casting, and die casting equipment
  • Member for die casting and process for manufacturing same, sleeve for die casting, and die casting equipment
  • Member for die casting and process for manufacturing same, sleeve for die casting, and die casting equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] Samples 1 to 9 were prepared as casting members, and their resistance to melting loss (melting loss rate) during repeated use was evaluated.

[0149] Hereinafter, the specific content will be described centering on Sample 2.

[0150]

[0151] A hot work tool steel of SKD61 specified in JIS-G-4404 (alloy tool steel steel) was processed into a cylindrical shape with a diameter of 10 mm×a height of 90 mm and used as a base material.

[0152] Quenching and tempering were performed on the base material, and the hardness was adjusted to about 45 HRC in terms of Rockwell hardness (HRC) specified in JIS G 0202.

[0153] Nitriding treatment and oxidation treatment under the conditions shown in Table 1 were sequentially performed on the entire surface of the base material after hardness adjustment, and a nitride layer and an oxide layer were sequentially formed on the entire surface of the base material to obtain Sample 2.

[0154] Here, the nitriding treatment was performed i...

Embodiment 2

[0214]

[0215] As the sleeve for die-casting, sleeve A (unprocessed) and sleeve B (unprocessed) having dimensions (outer diameter×inner diameter×length) approximately as shown in Table 2 were prepared. The base material of the sleeve is SKD61.

[0216] First, nitriding treatment was performed on the surfaces of these sleeves at an atmosphere gas flow ratio of ammonia:nitrogen=1:1 under the conditions of 530° C.×36 h to form nitrided layers. The structure of the formed nitrided layer was substantially the same as that of the nitrided layer in Sample 9 (Comparative Example) in Table 1.

[0217] Sleeve A (comparative example) and sleeve B (comparative example) were obtained as above.

[0218] Next, sleeve A (comparative example) and sleeve B (comparative example) were subjected to oxidation treatment (520° C. x 1.5 h in a steam atmosphere), and an oxide layer was formed on the nitrided layer in each sleeve.

[0219] The composition of the formed oxide layer was substantially...

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Abstract

The present invention provides a member for die casting, said member being to be used in contact with a molten metal. The member is provided with: a base metal consisting of a hot-work tool steel; a nitrided layer having a thickness of 200 to 400mum and consisting of two layers, namely, a nitrogen-diffusion layer which is in contact with the base metal and is composed of the base metal and nitrogen diffused therein and the Vickers hardness of which is higher than that of the base metal by 50HV or more, and a nitrogen compound layer which is contact with the nitrogen-diffusion layer and which consists of an iron-containing nitrogen compound and has a thickness of 5 to 40mum; and an oxide layer which is in contact with the nitrogen compound layer and contains an iron-containing oxide and which is to be brought into contact with the molten metal.

Description

technical field [0001] The present invention relates to a casting member, a manufacturing method thereof, a die casting sleeve, and a die casting device. Background technique [0002] A hot work tool steel that is excellent in thermal fatigue for casting members (such as dies and sleeves) that are conventionally used for die casting of aluminum, magnesium, and their alloys, etc., in contact with molten metals ) as the parent material. [0003] When the above-mentioned casting member undergoes significant erosion to molten metal during use, the repair frequency of the casting member becomes high, and the life of the casting member also becomes short. [0004] Here, for the purpose of improving the erosion resistance (erosion resistance) of the casting member, a method of forming a nitride layer on the portion of the casting member in contact with the molten metal, and further forming a nitride layer on the nitride layer have been proposed. Oxide layer method (for example, r...

Claims

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Application Information

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IPC IPC(8): C23C8/26B22C9/06B22D17/20B22D17/22C23C8/10C23C8/14C23C8/18
CPCB22D17/22C23C8/26B22C9/06C23C8/28B22D17/20C23C8/34
Inventor 市川正树西田纯一
Owner HITACHI METALS TOOL STEEL LTD