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A low-pressure casting one-step method for manufacturing semi-solid light alloy castings
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A low-pressure casting, light alloy technology, applied in the field of semi-solid metal processing, can solve the problems of uncontrollable, high cost, complicated operation process, etc., and achieve the effect of prolonging the free time of grains
Active Publication Date: 2017-09-26
SHENYANG RES INST OF FOUNDRY
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[0005] In order to solve the problems existing in the existing process of manufacturing semi-solid light alloy castings, such as poor quality of semi-solid metal slurry preparation, complicated operation process, uncontrollable, high cost, etc., the purpose of the present invention is to provide a method for manufacturing semi-solid light alloy castings Low pressure casting one-step method
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Embodiment 1
[0043] This implementation example is a semi-solid low-pressure rheologically formed ZL101A alloy casting. The composition of the alloy material is (weight percent) Si: 6.96%, Mg: 0.35%, Ti: 0.15%, Fe: 0.1%, Ni: 0.01%, Zn : 0.01%, Cu: 0.01%, Mn: 0.01%, Sn: 0.01%, and the rest is Al. The liquidus and solidus temperatures of the ZL101A alloy are 615°C and 560°C, respectively.
[0044] The specific process is as follows:
[0045] 1) Melt the ZL101A aluminum alloy in the crucible resistance furnace 1, and when the temperature of the alloy reaches about 680°C, add a modifying agent, and then add argon for refining after the modification is completed (the amount added is 0.5% of the total weight of the alloy liquid), and the argon The gas is pressed into the bottom of the light alloy liquid with a bell jar and gently swings to make the ZL101A aluminum alloy liquid boil completely. When there are no more bubbles in the bell jar, clean the slag with a scum spoon, and finally lower t...
Embodiment 2
[0049] This implementation example is a semi-solid low-pressure rheologically formed ZL114A alloy casting. The composition of the alloy material is (weight percent) Si: 6.96%, Mg: 0.55%, Ti: 0.15%, Fe: 0.1%, Ni: 0.01%, Zn : 0.01%, Cu: 0.01%, Mn: 0.01%, Sn: 0.01%, and the rest is Al. The liquidus and solidus temperatures of the ZL114A alloy are 615°C and 560°C, respectively.
[0050] The specific process is as follows:
[0051] 1) Melt the ZL114A aluminum alloy in the crucible resistance furnace 1. When the gold temperature reaches about 685°C, add a modifying agent. After the modification is completed, add argon for refining (the amount added is 0.5% of the total weight of the alloy liquid). Argon The gas is pressed into the bottom of the light alloy liquid with a bell jar and gently swings to make the aluminum alloy liquid boil completely. When there are no more bubbles in the bell jar, clean the slag with a scum spoon, and finally lower the temperature of the alloy liquid ...
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Abstract
The invention discloses a low-pressure casting one-step method for manufacturing semi-solid light alloy castings, and belongs to the field of semi-solid metal processing. A device for the method comprises a crucible resistance furnace, a liquid raising tube, a low-pressure sealing platform, a light alloy crystal leading channel, a sealing barrel, a connecting base, a mold fixing platform and a metal mold. According to the low-pressure casting one-step method, molten alloy with the temperature 15-35 DEG C higher than a liquid phase line flows through the light alloy crystal leading channel with strong chilling capacity under the gas pressure action and then is brought into a casting mold under the gas pressure action, and the castings of a small ball-shaped semi-solid structure are obtained finally. According to the low-pressure casting one-step method, light alloy semi-solid slurry is prepared in the process of mold filling and pouring in a one-step mode; a device special for transporting and preparing the light alloy semi-solid slurry is omitted; and the problems of slurry oxidization in the transportation process and control difficulty of slurry temperature in the process of slurry preparation in a traditional method of manufacturing the semi-solid light alloy castings are solved.
Description
technical field [0001] The invention relates to the technical field of semi-solid metal processing, in particular to a one-step low-pressure casting method for manufacturing semi-solid light alloy castings. Background technique [0002] The rapid preparation of semi-solid metal paste with spherical primary phase by online and one-step method is the core content of semi-solid metal forming technology. How to prepare semi-solid metal slurry on-line with high quality and high efficiency and directly flow into it has become the focus of research and attention on the industrialization of semi-solid metal processing technology. [0003] Production practice has proved that low-pressure casting has many advantages, which are summarized as follows: (1) Liquid metal fills the cavity smoothly from bottom to top, and the direction of liquid flow in the cavity is consistent with the direction of gas, so it can avoid the impact of liquid metal on the cavity. At the same time, it can redu...
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