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Warm house low pressure casting method for alloy casting and casting machine thereof

A low-pressure casting machine and low-pressure casting technology, applied in the field of low-pressure casting, can solve problems such as shortened machine life, high defective rate of finished products, and burrs, and achieve the effects of reduced defective rate, energy saving, and low extrusion pressure

Inactive Publication Date: 2007-06-27
杨然森 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the casting of magnesium alloy castings, since magnesium alloys are extremely easy to oxidize and burn, the oxidation caused by the fall of the magnesium alloy liquid in the booster tube when the above-mentioned process is used for casting and pressure relief, will be repeated, and a large amount of oxide skin will be produced in the booster tube , affect production efficiency, and may also cause oxidation inclusions in castings
[0004] Traditional casting equipment includes cold chamber die-casting machine, hot chamber die-casting machine and semi-melting thixotropic and rheological injection machines. In the sealed state, the casting contains air bubbles and more burrs, which reduces the yield and increases the casting cost
Cold room and hot die-casting machines are not easy to combine the mold and the equipment itself to vacuumize. During the molding process, the raw materials are in contact with the air, which is easy to cause the finished product itself to oxidize, envelop and burr.
Semi-melting thixotropic and rheological injection machines are theoretically close to plastic injection molding machines. The magnesium alloy granular raw materials are directly fed into the screw for heating and stirring. The wear of the material will shorten the life of the machine. In the case of soft materials, the magnesium alloy is easy to oxidize, and an inert gas (such as argon) must be added to it, so that the mixture of the raw material and argon will easily form air bubbles and burrs in the finished product, resulting in a high defective rate of the finished product.

Method used

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  • Warm house low pressure casting method for alloy casting and casting machine thereof
  • Warm house low pressure casting method for alloy casting and casting machine thereof

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1: Pressing aluminum alloy castings, alloy raw materials do not need to purchase expensive alloy ingots, this machine can inject raw materials into crucibles to melt and stir respectively, such as adopting aluminum alloy raw materials ADC12, the content of each component in the raw materials is: aluminum 80.5-85 %, copper 1.5-3.5%, silicon 9.6-1 2%, magnesium 0.3% or less, zinc 1% or less, iron 1.3% or less, manganese 0.5% or less, sodium 0.5% or less, arsenic 0.3% or less, melting temperature is 630°C About, insulation molding temperature is about 420 ℃, extrusion pressure is 320kgf / cm 2 .

[0030] The casting process of aluminum alloy castings is as follows:

[0031] a. Put the above-mentioned aluminum alloy raw materials into the crucible 1, heat and stir in the crucible to form a fluid alloy material.

[0032] b. Close the feed valve 21 with air channel at the feed port of the mold, vacuum the mold cavity 23, runner and pressure chamber 14; close the mo...

Embodiment 2

[0035] Embodiment 2: Magnesium alloy castings are pressed. When alloy raw materials have special materials, they are more expensive. This machine can respectively inject raw materials and special materials (such as beryllium, rare earth materials, etc.) into the crucible for melting and stirring. The content of each component in the raw material is: 89.5-90.5% of magnesium, 8.5-9.5% of aluminum, 0.45-0.9% of zinc, 0.17-0.4% of manganese, less than 0.05% of silicon, less than 0.025% of copper, less than 0.001% of sodium, iron Below 0.004% and other trace elements, the melting temperature is 590°C, the heat preservation molding temperature is 350°C, and the extrusion pressure is 250kgf / cm2 .

[0036] The casting process of magnesium alloy castings is as follows:

[0037] a. Put the above-mentioned magnesium alloy raw material into the crucible 1, and after vacuuming, fill in the inert gas from the inert gas charging connecting pipe 5, such as argon, etc., heat and stir in the cr...

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Abstract

The invention relates to low-pressure casting method and machine at room temperature for alloy casting, wherein, the method comprises, heating and mixing the material in sealed crucible to form liquid material; taking vacuum to the mould cavity, pouring and swaging cavity; feeding quantitatively liquid material to swaging cavity by screw feeding device, using piston-type extrusion device to press material into cavity and shape. This invention needs no big oil cylinder, saves energy and can decrease the rate of subquality product below 5% and the minimum wall thickness of casting less than 0.8mm.

Description

technical field [0001] The invention relates to low-pressure casting technology, in particular to a greenhouse low-pressure casting method for alloy castings and a non-parallel injection alloy greenhouse low-pressure casting machine. Background technique [0002] At present, the low-pressure casting process of low-melting point alloys mostly adopts the following steps: a compressed gas is introduced into a closed crucible filled with alloy liquid, and the pressure of the gas acts on the surface of the alloy that maintains a certain casting temperature. After the alloy passes through the runner, the mold gate, and fills the cavity smoothly along the riser tube connected to the mold, the pressure is increased to make the alloy liquid in the cavity solidify and crystallize under higher pressure; then the crucible The gas inside is depressurized, and the unsolidified liquid metal in the booster tube falls back into the crucible under the action of gravity; the next cycle is carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00
Inventor 杨然森张贵宁
Owner 杨然森
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