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A semi-continuous casting method and device for air pressure filling

A semi-continuous, mold-filling technology, applied in the field of metal material molding, can solve the problems of limited effect of grain refinement, limited effect of grain refinement, rising equipment investment cost, etc., to eliminate coarse columnar crystals and suppress macroscopic components Effect of segregation and promotion of crystal nucleus dissociation

Inactive Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) When the method of vibration is adopted, the vibration device is relatively complicated, and the effect of vibration leading to grain refinement is very limited
[0006] (2) When electromagnetic stirring or ultrasonic stirring is used, the device structure is complex, the equipment maintenance cost is high, and the grain refinement effect is limited, especially for large-scale ingots or alloys with relatively large specific gravity, to achieve ideal stirring As a result, it is necessary to greatly increase the strength of the electromagnetic field or the power of the ultrasonic wave, resulting in a substantial increase in equipment investment costs and a significant increase in technical difficulty

Method used

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  • A semi-continuous casting method and device for air pressure filling
  • A semi-continuous casting method and device for air pressure filling
  • A semi-continuous casting method and device for air pressure filling

Examples

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Embodiment 1

[0035] This embodiment is a semi-continuous casting method for air pressure filling. By setting a sprue between the tundish and the crystallizer, and controlling the flow rate of the molten metal at the outlet of the sprue, the convection of the molten metal in the liquid cavity is strengthened. effect and agitation to refine the crystals in the ingot.

[0036] The flow rate control of the molten metal at the outlet of the sprue is realized by adjusting the gas pressure in the tundish. The flow rate of the molten metal at the outlet of the sprue and the gas pressure in the tundish satisfy the following relationship:

[0037] v = D 2 nd 2 2 Hg + 2 P ρ ,

[0038] In the formula: v is the flow rate of the molten metal at the o...

Embodiment 2

[0049] In this embodiment, the copper-nickel-tin alloy is a solid solution alloy with a wide crystallization temperature. During slow cooling, thick dendrites tend to appear in the ingot structure, and the Sn solute tends to move outward along the dendrites. A reverse segregation of tin is formed.

[0050] The first: utilize the semi-continuous casting method and device of embodiment 1, take following process:

[0051] (1) The alloy composition is Cu-15Ni-8Sn. The ingot specification is φ180mm.

[0052] (2) The technological parameters in the casting process are as follows: the pouring temperature is 1250-1260°C, the ingot pulling speed is 1.6mms / s, the cooling water pressure is 0.06MPa, and the pressurized gas is argon.

[0053] (3) The diameter D of the inlet of the sprue is 3.7mm, and the diameter d of each opening at the outlet of the sprue is 1.5mm. There are 6 openings in total. The angle θ between the center line of the sprue and the center line of each opening is 60...

Embodiment 3

[0060] In this embodiment, the copper-nickel-tin alloy is a solid solution alloy with a wide crystallization temperature. During slow cooling, thick dendrites tend to appear in the ingot structure, and the Sn solute tends to move outward along the dendrites. A reverse segregation of tin is formed.

[0061] The first: utilize the semi-continuous casting method and device of embodiment 1, take following process:

[0062] (1) The alloy composition is Cu-15Ni-8Sn-0.35Ti. The ingot specification is φ350mm.

[0063] (2) The technological parameters in the casting process are as follows: the pouring temperature is 1250-1260°C, the ingot pulling speed is 1.1mms / s, the cooling water pressure is 0.1MPa, and the pressurized gas is argon.

[0064] (3) The diameter D of the inlet of the sprue is 9.8mm, the diameter d of each opening at the outlet of the sprue is 4mm, and there are 6 openings in total, and the included angle θ between the center line of the sprue and the center line of ea...

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Abstract

The invention discloses a semi-continuous casting method and a semi-continuous casting device for gas pressure mould filling. The semi-continuous casting method comprises the following steps: arranging a sprue runner between a tundish and a crystallizer, controlling the flow speed of metal melt in an outlet of the sprue runner, strengthening the convection effect and the stirring effect of the metal melt in a liquid cavity, thereby refining crystals in a cast ingot. The device comprises a tundish, a guide slot, a plunger rod, a sprue runner and a crystallizer, wherein the guide slot is formed in one side of the tundish; the plunger rod is arranged in a connector of the guide slot and the tundish; the tundish and the crystallizer are connected through the sprue runner, a liquid cavity is formed in the outlet of the sprue runner; the tundish is of a sealed type structure, and the top of the tundish is externally connected with a gas pressure control system. The semi-continuous casting method and the semi-continuous casting device can be used for achieving purposes of enabling the texture and components of the cast ingot to be uniform, eliminating thick cylindrical crystals, forming isometric crystals with fine crystalline grains and restraining macroscopic component segregation in the cast ingot.

Description

technical field [0001] The invention relates to the technical field of metal material forming, in particular to a semi-continuous casting method and device for air pressure filling. Background technique [0002] Semi-continuous casting is an important means of preparing ingots of metal materials, and has been widely used in the field of non-ferrous alloys. However, for some copper alloys with a wide crystallization temperature range (such as copper-nickel-tin alloys, etc.), it is easy to produce coarse columnar crystals and severe macroscopic component segregation during the semi-continuous casting process of large-scale ingots. A large number of production practices have shown that strengthening the melt agitation in the liquid cavity in the mold area during the semi-continuous casting process is an effective way to suppress the segregation of coarse columnar crystals and macroscopic components. [0003] In order to strengthen the melt stirring in the liquid cavity area, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/14
CPCB22D11/14B22D11/16
Inventor 张卫文陈强罗宗强张大童杨超
Owner SOUTH CHINA UNIV OF TECH
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