A casting method of large-size lead-free free-cutting aluminum alloy cast rod

An aluminum alloy, large-scale technology, applied in the field of aluminum alloy casting, can solve the problems of poor extrusion processing performance of free-cutting aluminum alloy cast rods, deterioration of mechanical properties of free-cutting aluminum alloys, and coarse second-phase compounds of composition segregation. Improve the uniformity of structure and composition and extrusion processing performance, eliminate hot cracks, and facilitate the effect of composition uniformity

Active Publication Date: 2021-05-25
广东领胜新材料科技有限公司
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AI Technical Summary

Problems solved by technology

[0006] In the casting production practice of large-scale lead-free free-cutting Al-Cu aluminum alloy casting rods with a diameter of more than 300 mm, it is found that when the low-melting point metal elements tin and bismuth are used to replace lead, due to the high density of tin and bismuth, the casting The segregation of tin and bismuth elements is very easy to occur inside the rod, and the segregation of tin and bismuth will seriously reduce the chip processing performance of aluminum alloy
In addition, due to the high element content of aluminum alloy and the wide range of crystallization temperature, hot cracks, composition segregation and coarse α-Al grains and second-phase compounds are prone to occur inside large-sized aluminum alloy casting rods, which will directly reduce the free cutting. The extrusion processing performance of aluminum alloy cast rods is poor, which deteriorates the mechanical properties of easy-cutting aluminum alloys, and even directly leads to the scrapping of aluminum alloy cast rods, which seriously affects the yield of aluminum alloy cast rods
Therefore, the casting method of the existing lead-free free-cutting aluminum alloy casting rod still needs to be improved and developed.

Method used

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  • A casting method of large-size lead-free free-cutting aluminum alloy cast rod
  • A casting method of large-size lead-free free-cutting aluminum alloy cast rod
  • A casting method of large-size lead-free free-cutting aluminum alloy cast rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060]A lead-free-cut aluminum alloy cast rod consisting of a percentage of mass: Cu 4.82%, Mg1.43%, Si 1.18%, Sn 0.71%, BI 0.19%, Mn 0.17%, Zr 0.015%, C 0.003 %, BA 0.1%, Fe0.13%, margins are Al and inevitable impurity elements, and the monocity of impurity elements is ≤0.05%, and the total amount of impurity element is ≤0.15%.

[0061]The lead-free-cutting aluminum alloy cast rod casting method includes the steps of:

[0062](1) According to the composition and mass percentage of the aluminum alloy cast rod, the aluminum content of 99.85% is selected from 99.9%, the magnesium content is 99.9%, the tin ingot, the ingam content of 99.9%. Ingots, Al-50Cu alloys, Al-20Si alloy, Al-10MN alloy, Al-10ba alloy and Al-5ZR-1C alloy are ingredients for raw materials;

[0063](2) The melting aluminum furnace is heated by the furnace bottom electromagnetic stirring function to heat the aluminum ingot at 785 ° C, then add magnesium ingot, tin ingot, bismuth ingot, Al-50Cu alloy, Al-20Si alloy, Al-10MN a...

Embodiment 2

[0069]A lead-free-cut aluminum alloy cast rod consisting of a percentage of mass: Cu 4.78%, Mg1.47%, Si 1.14%, Sn 0.75%, Bi 0.15%, Mn 0.15%, Zr 0.01%, C 0.002 %, BA 0.12%, Fe0.14%, margin is Al and inevitable impurity elements, and the monocity of impurity elements is ≤0.05%, and the total amount of impurity element is ≤0.15%.

[0070]The lead-free-cutting aluminum alloy cast rod casting method includes the steps of:

[0071](1) According to the composition and mass percentage of the aluminum alloy cast rod, the aluminum content of 99.85% is selected from 99.9%, the magnesium content is 99.9%, the tin ingot, the ingam content of 99.9%. Ingots, Al-50Cu alloys, Al-20Si alloy, Al-10MN alloy, Al-10ba alloy and Al-5ZR-1C alloy are ingredients for raw materials;

[0072](2) The melted aluminum furnace is heated by the furnace bottom electromagnetic stirring function to heat the aluminum ingot at 780 ° C, then add magnesium ingot, tin ingot, bismuth ingot, Al-50Cu alloy, Al-20Si alloy, Al-10Mn allo...

Embodiment 3

[0078]A lead-free-free-cut aluminum alloy cast rod consisting of 4.86%, Mg1.39%, Si 1.22%, Sn 0.65%, 0.25%, Mn 0.18%, Zr 0.02%, C 0.004. %, BA 0.08%, Fe0.11%, margin is Al and inevitable impurity elements, and the monocity of impurity elements is ≤0.05%, and the total amount of impurity element is ≤0.15%.

[0079]The lead-free-cutting aluminum alloy cast rod casting method includes the steps of:

[0080](1) According to the composition and mass percentage of the aluminum alloy cast rod, the aluminum content of 99.85% is selected from 99.9%, the magnesium content is 99.9%, the tin ingot, the ingam content of 99.9%. Ingots, Al-50Cu alloys, Al-20Si alloy, Al-10MN alloy, Al-10ba alloy and Al-5ZR-1C alloy are ingredients for raw materials;

[0081](2) The melting aluminum furnace is heated with a furnace base with an electromagnetic stirring function to heat the aluminum ingot at 790 ° C, then add magnesium ingot, tin ingot, bismuth ingot, Al-50Cu alloy, Al-20Si alloy, Al-10Mn alloy and Al- The 1...

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Abstract

The invention provides a method for casting a large-size lead-free free-cutting aluminum alloy casting rod, which belongs to the technical field of aluminum alloy casting. Furnace powder spraying refining degassing and impurity removal, on-line grain refinement treatment, on-line degassing and filtration treatment, ultrasonic vibration semi-continuous casting. The invention adopts electromagnetic stirring to smelt aluminum alloy liquid and ultrasonic vibration semi-continuous casting. By optimizing the design of smelting and casting process and parameters, it solves the problems of specific gravity segregation and solidification segregation of Sn, Bi and other elements, eliminates thermal cracks inside the casting rod, and refines α ‑The size of Al grains and second phase compounds improves the microstructure uniformity and extrusion processing performance of large-scale lead-free free-cutting aluminum alloy cast rods.

Description

Technical field[0001]The present invention belongs to the field of aluminum alloy casting, and more particularly to a casting method of large-sized lead-free-free cutting aluminum alloy cast rods.Background technique[0002]Aluminum alloys have the advantages of small density, high specific intensity, corrosion resistance, well-conductive conductivity, easy processing forming, recyclable utilization, are widely used in construction, automotive, electronics, electrical appliances, mechanical equipment and other fields. A large number of cars, milling, drilling, tapping, etc. are required in the production and manufacturing of many aluminum alloy components.[0003]Easy cutting aluminum alloy is usually a chocolate, non-stick knife, and an aluminum alloy that does not hurt the knife. Easy cutting aluminum alloy can be cut by a higher speed or a larger input, so that the production efficiency of the cutting of aluminum alloy components can significantly improve the production efficiency of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06B22D11/00C22B9/02C22B9/05C22C21/14C22C21/16
CPCB22D11/003C22B9/023C22B9/05C22C1/026C22C1/03C22C1/06C22C21/14C22C21/16
Inventor 牛艳萍王彩雯张大鹏覃建波
Owner 广东领胜新材料科技有限公司
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