Method for full mold-filling casting below melting point

A melting point and complete technology, applied in the field of metal or alloy material casting, can solve the problems of many casting defects, poor filling ability, failure to meet the design requirements, etc., and achieve the effect of reduced production cost and fine grain size

Active Publication Date: 2012-06-27
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The filling ability of this method is very poor, and the poured casting has too many defects, which cannot meet the design requirements

Method used

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  • Method for full mold-filling casting below melting point
  • Method for full mold-filling casting below melting point
  • Method for full mold-filling casting below melting point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 uses K4169 alloy, and the size of the filling sample is: 60×60×40+60×60×20+60×60×8+60×60×2.5 in a stepped shape.

[0034] figure 1 For the pouring of the above-mentioned different variable cross-section castings, as well as figure 2 and image 3 metallographic structure.

[0035] Carry out induction melting and refining process on the metal material, cool down the pouring liquid after melting and refining, apply a constant power 5KW, 200HZ low-frequency current induction magnetic field to the pouring liquid, this power can keep the pouring liquid still cooling continuously; When the pouring liquid cools down to about 15°C below the melting point, the supercooled liquid is injected into the casting formwork that maintains the same low-frequency induction magnetic field. The temperature of the pouring formwork is kept at about 800°C, and the pouring is performed at 15°C below the melting point. At this time, the pouring liquid still maintains good fluidity u...

Embodiment 2

[0038] Figure 4 As one of the examples of complex shape products mass-cast in industrial production, the alloy material is K4202 alloy. The maximum outer circle of the casting is Φ200mm, the smallest inner circle is Φ26mm, the thickest wall is 14mm, and the thinnest wall is 3mm.

[0039]First, the alloy material is melted by induction and refined. After melting and refining, the pouring liquid is cooled, and a low-frequency induction magnetic field with a constant power of 10KW and 300HZ is applied to the pouring liquid. This power keeps the pouring liquid continuously cooling without Solidification; when the pouring liquid cools down to about 12°C below the liquidus line, it still maintains fluidity. At this time, the supercooled 12°C pouring liquid is injected into the casting mold that maintains the same low-frequency induction magnetic field, and the temperature of the casting mold shell remains Pouring is performed at around 1000°C and 12°C below the melting point. The...

Embodiment 3

[0042] Embodiment 3 is K4169 alloy casting material, Figure 15 It is the structural diagram of the industrial casting fluidity test of embodiment 3, Figure 16 and Figure 17 respectively in Figure 15 The physical morphology of the grains cut at the riser A of the casting and the bottom B of the vertical square runner.

[0043] First conduct induction melting and refining process on the pouring material, cool down the pouring liquid after melting and refining, apply a low-frequency stable magnetic field with a constant power of 15KW and 1000HZ to the pouring liquid, and this frequency keeps the pouring liquid continuously cooling; When the pouring liquid cools down to about 15°C below the melting point, inject the supercooled pouring liquid into the casting mold that maintains the same low-frequency induction magnetic field, keep the temperature of the pouring mold shell at about 600°C, and pour at 15°C below the melting point. Because the pouring liquid still has good fl...

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Abstract

The invention provides a method for full mold-filling casting of total-cross-section equiaxed crystals below the melting point, which can be applied to the industry and realizes design effect. In the method, when being cooled continuously until the temperature thereof is below the melting point, casting liquid keeps flowing until filling molds completely and being crystallized, and accordingly equiaxed crystals are separated out of each section of castings. Compared with the method of forging or rolling, the method has the advantages that deformation texture and deformation streamlines which cause anisotropy of mechanical property are omitted, and problems about refinement of crystal grains and direct forming of high-strength alloy which is incapable of being forged are solved. Products casted by the method have no classic three-crystal zones when compared with general casting products. In addition, the method can be used for forming coarse inherent grain steel casting products in different complicated shapes, and accordingly casting products can substitute for forging products.

Description

technical field [0001] The invention relates to the field of metal or alloy material casting, in particular to a fully filling casting method in which the pouring liquid remains flowing below the melting point. Background technique [0002] Under the influence of casting process factors, the fluidity of the molten metal, that is, the ability to fill the mold is called the filling ability. The better the fluidity of the liquid alloy, the stronger its filling ability, and the easier it is to cast castings with complex shapes such as correct shape, slender and thin walls. Liquid alloys with poor fluidity cannot be cast to meet the quality due to their poor filling ability. Castings with complex shapes required. [0003] The higher the pouring temperature of the pouring liquid and the longer it remains flowing in the mold, the stronger its filling ability. But its crystalline grain is larger. [0004] At present, theoretical researchers in this field are limited to research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02
Inventor 赵京晨燕平张龙飞韩凤奎
Owner CENT IRON & STEEL RES INST
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