Magnesium alloy casting method and device thereof

A magnesium alloy and mixed gas technology, which is applied in the field of casting, can solve the problems of magnesium alloys being easy to burn, and achieve the effects of good performance, convenient operation, and easy mass production

Inactive Publication Date: 2014-04-02
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: how to provide a casting method of magnesium alloy, so as to overcome the technical problem of easy oxidation and burning of magnesium alloy in the casting process in the prior art; and provide a casting device of magnesium alloy

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  • Magnesium alloy casting method and device thereof
  • Magnesium alloy casting method and device thereof
  • Magnesium alloy casting method and device thereof

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Embodiment 1

[0040] like figure 1 As shown, this embodiment describes a casting method for magnesium alloy near pressure regulating gas protection, the method includes the following steps:

[0041] Step 101. Put the molten magnesium alloy at a temperature of 730° C. to 820° C. after smelting and deslagging into a crucible. The crucible is built into a lower tank, and the lower tank is sealed with a sealing cover.

[0042] On the one hand, due to the high pouring temperature of magnesium alloy thin-walled parts, the magnesium alloy melt and gypsum are prone to react; The reaction between liquid and gypsum, therefore, after many tests, the melting temperature of the magnesium alloy in this embodiment is 730°C-820°C.

[0043] Step 102: Put the preheated plaster mold at a temperature of 200° C. to 400° C. on the sealing cover plate, and cover the lower jar with the upper jar.

[0044] In order to prevent the temperature of the gypsum mold from being too low and reduce the temperature of the ...

Embodiment 2

[0064] The following ZM10 magnesium alloy, gypsum-type ingredients (mass fraction) are: 15% to 20% of quartz powder, 6% to 8% of talc powder, 60% to 85% of α hemihydrate gypsum, 18% to 25% of MgS0 4 , water and other materials, the mixed gas ratio is 10% sulfur hexafluoride and 90% argon as raw materials, combined Figure 4 The casting device structural diagram shown, specifically introduces this embodiment, as figure 2 As shown, the specific steps of a casting method of a magnesium alloy near pressure regulating gas protection described in this embodiment are as follows:

[0065] In step 201, the ZM10 magnesium alloy is smelted at 780° C., and the slag is removed, and the slag-removed magnesium alloy melt is put into a crucible, and the lower tank is sealed with a sealing partition.

[0066] Step 202, preheating the gypsum mold at 380°C, closing the tank and putting the upper tank cover on and off the tank.

[0067] Step 203, pressurizing the lower tank for 1 minute with ...

Embodiment 3

[0073] The casting method of a magnesium alloy close to the pressure regulating gas protection described in this embodiment is basically the same as the technical solution described in the above-mentioned preferred embodiment, except that the raw materials and process parameters are different:

[0074] 1. The raw materials are different, the magnesium alloy is ZM5, and the mixed gas ratio is 5% sulfur hexafluoride + 95% argon;

[0075] 2. The temperature of the magnesium alloy ZM5 melt is 820°C, and the preheating temperature of the gypsum type is 400°C;

[0076] 3. Vacuumize the upper tank to make the negative pressure of the upper tank reach -20KPa, and then inject the mixed gas into the upper tank to raise the negative pressure of the upper tank to -10KPa;

[0077] 4. Pressurize the lower tank for 2 minutes with a mixed gas of 5% sulfur hexafluoride and 95% argon at a pressure of 3Kpa

[0078] 5. Use the air pressure of 55KPa to pressure pour the lower tank, the liquid lifti...

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Abstract

The invention discloses a magnesium alloy casting method which comprises the steps of smelting magnesium alloy and deslagging; preheating a gypsum mould; using a gas mixture containing 1-10% of sulfur hexafluoride and 90-99% of argon to pressing a lower tank for 1-2 minutes with the gas pressure of 1-5Kpa; vacuumizing an upper tank to reach a specified negative pressure value k1, injecting a gas mixture containing 1-10% of the sulfur hexafluoride and 90-99% of the argon into the upper tank to rise to a specified negative pressure value k2; pressing the lower tank with the gas pressure of 10-80KPa to realize pressing casting. The invention discloses a magnesium alloy casting device. According to the technical scheme disclosed by the invention, a produced casting has the average wall thickness of 1.0-1.5mm, the tensile strength of 190MPa and the ductility of 2-3%, and is high in surface quality, compact in internals and good in performance, oxidation, cold shut and slag inclusion defects are avoided, and simple process, convenience in operation and low cost are realized.

Description

technical field [0001] The invention relates to a casting technology, in particular to a magnesium alloy casting method and a device thereof. Background technique [0002] Magnesium alloy has low density, high specific strength / specific stiffness, stable size, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding and other advantages. At present, as an important structural material, it is widely used in aviation, aerospace, automobile, electronic communication and other industrial fields. In the field of national defense, due to the relatively high requirements for individual combat, magnesium alloys also have a place as weight-reducing materials. As early as the 1950s, the skins, frames and engine casings of my country's imitated aircraft and missiles had used magnesium rare earth alloys. After the 1970s, with the rapid development of my country's aerospace technology, magnesium alloys have been gradually promoted and applied...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D21/04B22D18/04
Inventor 王狂飞许广涛历长云周志杰张锦志米国发刘宝忠王有超
Owner HENAN POLYTECHNIC UNIV
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