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Method for processing cavity surface of casting mold

A processing method and cavity technology, which can be used in casting and molding equipment, molds, mold components, etc., can solve problems such as reducing mold release, sticking, and angular shapes of concave and convex parts, reducing contact area, reducing Contact area, the effect of improving fluidity

Active Publication Date: 2011-08-17
SINTOKOGIO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processing methods have the following problems: the range that can be processed on the cavity surface is limited, and sufficient fluidity cannot be obtained in a mold with a complex cavity shape.
In addition, since it is very difficult to form concavo-convex portions whose size, depth, shape, etc. are highly controlled in wrinkling processing, there is a problem that sufficient fluidity cannot be obtained.
[0005] In addition, the shape of the formed concavo-convex portion has corners, so there is a problem that when releasing the mold from the mold of the cast product, it is easy to cause snagging, etc., so the ease of releasing from the mold (mold release property) will be reduced.
In the case where the concave-convex portion has directionality in one direction, it is difficult for the release agent applied on the cavity surface to improve the releasability to remain on the cavity surface uniformly, so there is a problem that the releasability is lowered

Method used

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  • Method for processing cavity surface of casting mold
  • Method for processing cavity surface of casting mold
  • Method for processing cavity surface of casting mold

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Embodiment is the example that utilizes processing method (a) to implement, Figure 4 (1)-(3) show the form of the surface texture of the surface (cavity surface 11) of the test piece used as a mold material before processing and after each spray processing process. Hereinafter, this embodiment will be described in detail using the above-mentioned drawings. However, the present invention is not limited to the following embodiments.

[0045] Figure 4 (1) shows the surface properties of a test piece of alloy tool steel SKD61 used as the mold material used in this example. Formed processing marks. The hardness of the test piece was Hv470-500, and the surface roughness was Ra0.07 (≈Rz0.6μm).

[0046] Figure 4 (2) Indicates "amorphous" spherical amorphous particles with a hardness of Hv900 and a particle size of 50 μm TM (AM-50 manufactured by Shinto Kogyo Co., Ltd.) was used as the second blasting material in the blasting process B, and the surface properties of the...

Embodiment 2

[0052] In this example, a thin plate material was cast using a die-casting die, and the fluidity was compared with a cavity surface produced by a conventional wrinkling method. In order to eliminate the influence of the deviation of casting conditions, a mold with symmetrical cavity shape was prepared, and the conventional wrinkle processing was performed on the left half of the cavity surface, and the spray processing of the present invention was carried out on the right half of the cavity surface, and compared liquidity. The fluidity was evaluated by comparing the density of the left half and the right half of the casting. In the case of poor fluidity, the density decreases due to phenomena such as poor filling or entrapment of air bubbles.

[0053] Pouring molten metal, using aluminum alloy (ADC12: density 2.72g / cm 3 ) is poured into the cavity at a melting temperature of 700°C and a mold temperature of 300°C. Density measurement was performed after the casting was remov...

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Abstract

Disclosed is a method for processing the cavity surface of a casting mold wherein the fluidity is good even if the shape of the cavity surface (casting product) is complicated, mold release performance is excellent, reprocessing is possible, and the life of the mold can be enhanced. A jet processing step (A) for forming hemi-spherical first dimples (12) in the cavity surface (11), and a jet processing step (B) for forming second dimples (13) more minute than the first dimples (12) are provided, a processing method (a) and a processing method (b) where either the jet processing step (A) or the jet processing step (B) is carried out preferentially, and a processing method (c) where only the first dimples (12) are formed by carrying out only the jet processing step (A) are provided.

Description

technical field [0001] The present invention relates to a method of processing a cavity surface of a casting mold used for die casting and the like. Background technique [0002] Conventionally, die casting methods such as die-casting have been used to manufacture automotive engine parts such as cylinder heads and oil separators from non-ferrous metals such as aluminum. In the mold casting method, when the flow (fluidity) of the molten metal in the mold deteriorates during casting, defects such as minute flaws and unevenness are likely to occur in the cast product, so various measures are taken to improve the fluidity. Measures for improving fluidity include reducing the contact area between the molten metal and the cavity surface by forming unevenness on the mold surface (cavity surface), thereby reducing the flow resistance of the molten metal. As a method of improving the fluidity of molten metal by forming concavo-convex portions on the cavity surface, for example, Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/06B22D17/22
CPCB22D17/22B22C9/061B22C9/06
Inventor 平野雅雄堀部喜学
Owner SINTOKOGIO LTD
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