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Rectangular cold crucible system suitable for continuous fusion casting directional freeze

A technology of directional solidification and cold crucible, applied in the field of cold crucible system, can solve the problem that cold crucible cannot be used to process rectangular cross-section ingots, etc.

Inactive Publication Date: 2006-02-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantage that the existing cold crucible cannot be used to process rectangular cross-section ingots, the present invention provides a cold crucible system that can make the magnetic field distribution uniform and the metal melting temperature consistent so as to obtain high-quality alloy ingots

Method used

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  • Rectangular cold crucible system suitable for continuous fusion casting directional freeze
  • Rectangular cold crucible system suitable for continuous fusion casting directional freeze
  • Rectangular cold crucible system suitable for continuous fusion casting directional freeze

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specific Embodiment approach 1

[0005] Specific embodiment 1: Since one of the applicant’s goals is to continue to realize the directional solidification forming of large-size plate-shaped billets of titanium-aluminum-based alloys based on the already declared cold crucible electromagnetic continuous casting and directional solidification technology, first Qualitative analysis of the electromagnetic forming of the shaped parts has been carried out through research. It is found through research that, as the width-to-thickness ratio increases, the electromagnetic pressure difference on the adjacent two sides of the plate-shaped parts with different width to thickness ratios increases, and the magnetic induction intensity appears along the outer contour of the plate. The saddle-shaped distribution tends to be lower at the straight side part and gradually higher at the corner part. When the aspect ratio is too large (>3), it is always difficult to form a predetermined shape at the corners of the plate. This is the r...

specific Embodiment approach 2

[0007] The second embodiment is different from the first embodiment in that this embodiment focuses on the influence of the radius of the transition fillet between the two adjacent surfaces of the cavity 1-1 on the melting of the sheet metal. Regardless of the transition fillet radius between the two adjacent surfaces of the cavity, only the technical solution described in the first embodiment can achieve the purpose of the present invention, but if the transition fillet radius is taken into account, the magnetic field will be obtained. Crucible system with more even distribution.

[0008] On the premise of ensuring the technical solution of the first embodiment, the transition fillet radius of the cavity in the cold crucible is also an important factor affecting the uniform melting of the rectangular sheet. The heating capacity of the fillet part and R 0 (Fillet radius) is proportional to the square, that is q 0 = ...

specific Embodiment approach 3

[0011] Specific embodiment three: The technical solutions described in the first and second embodiments can achieve the purpose of the present invention well. If the wall thickness of the crucible, the structure of the seam, and the position of the seam on the crucible are taken into consideration, it will be better. The distribution of the magnetic field and the intensity of the magnetic field inside the crucible are well adjusted, so as to better achieve the purpose of the present invention.

[0012] The smaller the wall thickness, the better the magnetic permeability of the crucible, so as long as the wall thickness can ensure processing.

[0013] The effect of the split shape of the crucible on the magnetic permeability of the crucible is as follows: within a certain height range, when the split shape is triangular, the magnetic current density in the crucible is the largest, and when the crucible split is square, the magnetic current density is the smallest. The magnetic curr...

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Abstract

The rectangle cold crucible system fit to casting continually and directional solidification comprises mould cavity 1-1 of crucible body 1 with proportion of width, length and height as 1:2~6:10~20 that belongs to fillet transition of two near surfaces and four square platform of big end down; opening splits with number about 6~18 run through outer surface 1-2 to mould cavity 1-1 on crucible body 1. This invention has no pollution to material, prepares heterotype alloy blank of high quality, overcomes the limit to rectangular intersection blank and fits to requirement of metallurgical and aerospace industry.

Description

Technical field: [0001] The invention relates to a cold crucible system. Background technique: [0002] Cold crucible technology originated in the 1950s and 1960s. In recent years, it has become a new technology emerging with its structural form and its combination with other processing technologies. It is a water-cooled copper crucible with split insulation placed on a high In the frequency alternating electromagnetic field, the eddy current heat effect generated by the alternating electromagnetic field is used to melt the metal and keep the molten metal in a soft or non-contact state with the side wall of the crucible, while electromagnetic stirring or constraining the furnace charge. Due to the non (soft) contact between the molten metal and the wall of the crucible, it can maintain the high purity of the original metal and prevent the contamination of various interstitial elements during the smelting or forming process. The processed titanium alloy has accurate composition an...

Claims

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Application Information

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IPC IPC(8): B22D11/112
Inventor 丁宏升王艳丽李春晖毕维生郭景杰傅恒志
Owner HARBIN INST OF TECH
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