Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy

A semi-solid and alloy technology, which is applied in the field of semi-solid alloy forming, rheological forming process, inclined cooling shear frequency conversion vibration device, can solve the problems that hinder large-scale popularization and application, heating temperature is difficult to control, and heating equipment is complicated. Achieve the effects of improving the solidification structure, simple structure, and increasing the probability of nucleation

Inactive Publication Date: 2010-03-03
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of forming process, thixoforming is mainly used. Thixoforming needs to make a blank first, and then heat it to the temperature of the semi-solid alloy for forming. The main problem of thixoforming is that the heating temperature is not easy to control, and the blank is oxidized during the heating process. High energy consumption, high technical requirements, and complex heating equipment have seriously hindered the large-scale application of this technology in the world

Method used

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  • Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy
  • Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy
  • Device for preparing semi-solid alloy melt and process for preparing AlSi9Mg semi-solid alloy

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Embodiment 1

[0043] The process of preparing a semi-solid AlSi9Mg alloy melt or blank using the device for preparing a semi-solid alloy melt of the present invention comprises the following steps:

[0044] The first step: Put the aluminum-silicon alloy ingot and pure aluminum ingot into the electric resistance crucible boiler, heat up to 690℃~710℃ after they are completely melted, and then add the preheated aluminum-manganese master alloy.

[0045] The second step: at 680° C. to 700° C., press pure Mg wrapped in aluminum foil into the alloy liquid, and the weight of Mg accounts for 0.4% of the weight of the alloy liquid.

[0046] Step 3: After all the furnace materials are melted, refine with nitrogen at 700°C to 720°C to degas and remove slag from the alloy liquid.

[0047] Step 4: After refining, raise the temperature of the alloy solution to 720°C to 740°C for modification treatment, using sodium salt or Al-Sr alloy as the modification agent.

[0048] Step 5: At a certain inclination a...

Embodiment 2

[0055]Utilize the device for preparing semi-solid alloy melt of the present invention to prepare the rheological die-casting of semi-solid AlSi9Mg alloy except comprising the first to the fifth steps of preparing semi-solid AlSi9Mg alloy melt described in embodiment 1, also include Follow the steps below:

[0056] A. Preheat the mold to 200℃~220℃, apply water-based or wax-based paint inside the mold, and connect the mold to the front end of the die-casting machine.

[0057] B. Adjust the position of the U-shaped cooling tank so that the liquid outlet of the U-shaped cooling tank 10 is aligned with the material receiving port of the rheological die-casting equipment, and the prepared semi-solid alloy melt is directly poured into the pressure chamber of the rheological die-casting equipment.

[0058] C. Die-casting is carried out under the conditions that the specific injection pressure is 40MPa-80MPa, and the filling speed is 1.2m / s-2.5m / s.

[0059] D. Hold the pressure for 10...

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Abstract

The invention discloses a device for preparing semi-solid alloy melt and a process for preparing AlSi9Mg semi-solid alloy. The device comprises a vibrating device which comprises a base and a table top that are connected by a pillar and a rubber spring, the vibrating device is connected with a cooling groove in an inclined way by a supporting frame which can regulate an angle, the table top is provided with a three dimensional vibrating motor, the vibrating acceleration speed is 1 to 2g, the vibrating range is 0.5 to 1mm, the vibrating frequency is 10 to 60 Hz, and a liquid outlet end of the cooling groove corresponds to a forming device. The angle of the cooling groove is 40 to 60 degrees, and the pouring length is 600 to 800mm. The forming device comprises an injection chamber of a die-casting machine, an injection rod, an injection head, a material receiving port and a mold. The rheological forming process for preparing the semi-solid AlSi9Mg alloy melt comprises the steps of alloymelting, gas and slag removing, refining, modifying, inclined vibrating and pouring, rheological die-casting and the like. The device and the process can improve the texture and performance of the semi-solid alloy and solve the problem of solidification and crusting on the surface of an inclined plate in the preparing process.

Description

technical field [0001] The invention belongs to the technology of semi-solid alloy forming in the field of metal forming, and in particular relates to an oblique cooling, shearing, frequency conversion vibration device and rheological forming process for semi-solid alloy melt. Background technique [0002] Semi-solid forming technology is to obtain a solid-liquid mixed melt in which a certain spherical primary solid phase is evenly suspended in the liquid metal mother liquid during the solidification process of the alloy, and use this solid-liquid mixed melt to directly perform forming processing (ie rheological deformation), or first make the solid-liquid mixed melt into a blank, and then reheat to the solid-liquid two-phase region for forming processing (ie, thixotropic deformation), both of which are called semi-solid forming technology. In order to obtain a solid-liquid mixed melt, it is generally necessary to vigorously stir or disturb the molten metal, or change the t...

Claims

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Application Information

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IPC IPC(8): C22C1/00B22D17/08C22C1/03C22C1/06
Inventor 谭建波李增民李立新
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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