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Metal die device, die-casting method and die-cast articles

A metal mold and product technology, applied in the metal field, can solve problems such as sand sticking, poor filling, and casting wrinkles

Inactive Publication Date: 2002-12-25
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the die-casting or metal injection molding of magnesium alloys, there are unique problems such as sand sticking, poor filling, hot cracks or shrinkage cracks, casting wrinkles, shrinkage cavities, etc.
In particular, there is a tendency to increase these problems in the thin casting expected in recent years, or in the use of alloys containing silicon, rare earth elements, or calcium. The mold method is only a trial method of repeating previous experience and extension, and there is no systematic design guide for the metal mold method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1 to 6

[0072] The metal mold method is to use:

[0073] Set four gates, and set up direct runners from the sprue to each gate,

[0074] Set the non-gate distance between adjacent gates to 5mm,

[0075] Set the volume of each runner from the gate to each gate to be the same,

[0076] The cross-sectional area of ​​each gate is set to be proportional to the volume of the product that should be filled from the gate,

[0077] The total cross-sectional area of ​​each runner from the gate to each gate is kept the same in the flow direction of the molten metal,

[0078] Set the shape of the runner to R15 or higher.

[0079] Using the above metal mold method, using AZ91 (Mg-9Al-0.7Zn-0.2Mn) alloy, the cold chamber die-casting machine uses a 650-ton machine made by Ube Corporation of Japan, and the temperature of the alloy melt is set at 680 ° C. The filling speed of the cavity is set to 5 / 100 seconds, and the pressurization after filling is set to 300kgf / cm 2 , set the metal mold tempera...

Embodiment 3

[0082] Adopt the metal mold method adopted in embodiment 1, use the high Mg-5Al-3Ca-0.2Mn alloy of thermal cracking sensitivity, Mg-5Al-4RE-0.2Mn-0.05Ca alloy, Mg-5Al-2Si-0.5RE -0.2Mn alloy, or Mg-9Al-2Ca-2RE-1Si-0.2Mn alloy, the cold chamber die-casting machine uses a 650-ton machine made by Ube Corporation of Japan, and the temperature of the alloy melt is set at 700 ° C, and the mold cavity The filling speed is set to 5 / 100 seconds, and the boost pressure after filling is set to 500kgf / cm 2 , set the temperature of the metal mold to 200°C, set the air pressure in the metal mold to 40mmHg during die-casting, and implement a box-type trial product with a wall thickness of 3mm in the size of 300mm×300mm×180mm imitating auto parts casting. No hot cracking was seen in all four die castings. Example 4

Embodiment 4

[0083] In order to make the die-cast product into a shape that is prone to shrinkage cracking, a portion where the wall thickness is changed from 300 mm to 10 mm is provided at the four corners of the box-shaped trial product in Example 3. Using the Mg-5Al-4Ca-1RE-0.2Mn alloy, casting a trial product of this shape under the same conditions as in Example 3 resulted in shrinkage cracks occurring at a probability of about 10% at the edge of the wall thickness change portion, and after casting Sand sticking occurs every 100 to 300 shots at the part where the mouth enters the die-casting product.

[0084] Therefore, as a countermeasure against shrinkage cracking, the occurrence of shrinkage cracking can be suppressed when the mold part of the wall thickness changing part is cooled to 230°C (the temperature difference from the surrounding mold temperature is 20K).

[0085]As a countermeasure against sand sticking, when casting is performed by applying a release agent added with BN t...

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Abstract

The present invention provides a kind of metallic mold scheme and the die casting method for magnesium alloy using the same that the metallic mold scheme is applied to die casting for magnesium alloy or metal injection molding. The invention is characterized that it provides a plurality of vertical gates and configured with horizontal runners from vertical runners to each gates; and, the distances of non-gating portion between neighbored gates are set to under 10 mm except that the product design was not allowed for this setting. The die casting method using the disclosed metallic mold scheme can be applied to thin-wall die casting, especially for the thin-wall die casting with thickness under 1.5 mm or for the alloy casting containing silicon, rare earth elements, calcium. The die casting product from the invented method will have no wrinkles, surface cracks, insufficient filling, and without mold adherence.

Description

technical field [0001] The present invention relates to a metal mold method suitable for metal injection molding such as die-casting or thixomouldirg (thixomouldirg) manufacturing method of magnesium alloys, and the die-casting method and die-casting products using the metal mold scheme. More specifically, it relates to A die-casting method that can be used to manufacture thin-walled cast parts required for the manufacture of housings for home appliances, various container parts for automobiles, etc. By using the die-casting method using this die-casting method, for example, a minimum wall thickness of 1.5 mm or less can be achieved Die-casting method and die-casting products of magnesium alloy. Background technique [0002] Also, the present invention relates to a die-casting method and die-cast product of a magnesium alloy excellent in room temperature strength and high-temperature strength, and more specifically, relates to a high temperature of about 523K required for we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/22B22C9/00B22D17/00B22D17/14B22D17/32C22C23/02
CPCB22D17/08B22D17/22B22D17/32B22D21/007
Inventor 久保田耕平山本优野坂洋一
Owner MITSUI MINING & SMELTING CO LTD
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