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Gating system capable of effectively controlling air entrainment and slag entrainment and design method thereof

A pouring system and design method technology, applied in the control of molten metal pouring from ladles, manufacturing tools, casting equipment, etc., can solve problems such as difficult to ensure smooth filling of molten metal, unreasonable pouring system, etc., to avoid large Reduce the amplitude, ensure the purity, and avoid the effect of temperature

Active Publication Date: 2012-01-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a gating system that can effectively control entrainment of air and slag, so as to solve the problems of unreasonable gating system in factories and difficulties in ensuring smooth filling and purity of molten metal.

Method used

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  • Gating system capable of effectively controlling air entrainment and slag entrainment and design method thereof
  • Gating system capable of effectively controlling air entrainment and slag entrainment and design method thereof
  • Gating system capable of effectively controlling air entrainment and slag entrainment and design method thereof

Examples

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Effect test

Embodiment 1

[0055] A certain type of machine tool bed is poured, the pouring material is HT250, the pouring temperature is 1360°C, and the weight of the casting is 12t. The cross-sectional area size is Φ55mm, and the height of sprue 1 is 1650mm. The design principle is the principle of equal flow rate. The design of the upper part and the lower part is conducive to the floating of gas and inclusions to the top, and at the same time, it can avoid the erosion of the sprue by the molten metal.

[0056] Such as Figure 4 As shown, the corner of sprue 1 and runner 4 adopts arc bend 3 for transition, the radius of arc bend 3 is 80mm, the equivalent diameter of runner 4 is 60mm, and the cross-sectional area of ​​arc bend 3 The variable diameter design is carried out, the diameter changes between 55mm-90mm, and the negative pressure at the corner is avoided to cause air entrainment. Figure 3 (a) and Figure 3 (b) are traditional pouring systems. It can be seen that the present invention is compare...

Embodiment 2

[0061] A certain type of machine tool bed is poured, the pouring material is HT250, the pouring temperature is 1370°C, and the weight of the casting is 12t. The pouring system is designed as follows. The size is Φ60mm, and the height of the sprue 1 is 1750mm. The design principle is the principle of equal flow rate. The design of the upper part and the lower part is conducive to the gas and inclusions floating to the top, and at the same time, it can avoid the erosion of the molten metal on the sprue 1.

[0062] The corner of sprue 1 and runner 4 adopts arc transition, the radius of arc bend 3 is 90mm, the equivalent diameter of runner 4 is 70mm, and the diameter of arc bend is changed from 60mm to 100mm In between, from the sprue 1 to the runner 4, the cross-sectional diameter gradually increases to avoid negative pressure at the corner and cause air entrainment. Using the parallel design of double runners, the cross-sectional area of ​​the parallel runners is the same, the d...

Embodiment 3

[0064] 15t steel ingot is poured, the pouring material is 40Cr2, the pouring temperature is 1560°C, and the weight is 15t, such as Figure 6 As shown: the gating system is designed as a cone-shaped sprue, where the top of the sprue is Φ85mm, the end of the sprue is Φ50mm, and the height of the sprue is 1550mm. The design principle is the principle of equal flow. The design of the upper part and the lower part is conducive to the gas and inclusions floating to the top, and at the same time, it can avoid the erosion of the sprue by the molten metal.

[0065] The corner of sprue 1 and runner 4 adopts arc bend transition, the radius of arc bend 3 is 65mm, the equivalent diameter of runner 4 is 65mm, and the diameter of arc bend 3 is designed with variable diameter. The diameter changes between 60mm-85mm, avoiding negative pressure at the corner and causing air entrainment. Using the parallel design of double runners, the cross-sectional area of ​​the parallel runners is the same,...

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Abstract

The invention relates to a gating system capable of effectively controlling air entrainment and slag entrainment and a design method thereof. The gating system comprises a sprue, a runner and a plurality of ingates; the sprue is of a big-end-up conical structure, and the maximum cross-sectional area of the upper end is 1.5 to 3 times larger than the minimum cross-sectional area of the lower end; the runner is connected with the lower end of the sprue through a smooth curve, the radius of the curve is 1 to 5 times larger than the equivalent diameter of the runner, the cross-sectional radius ofthe curve is reduced, and the radius-reducing change is between 1 and 5 times larger than the cross-sectional equivalent radius of the runner; the ingates are connected with the runner, and the sum of the cross-sectional areas of the ingates is 2 to 10 times larger than the cross-sectional area of the runner. The invention solves the problem that the conventional gating system is not reasonable and can hardly guarantee the smooth filling and purity of molten metal, the phenomena of secondary oxidation, air entrainment and slag entrainment are prevented in the process of pouring molten metal, so that the quality of castings can be guaranteed, and the invention is suitable for the design of gating systems for the sand mold casting, metal mold casting, casting blank casting and precision casting of non-ferrous metal, ferrous metal, high-temperature alloy and the like.

Description

technical field [0001] The present invention relates to a pouring system in the casting process, in particular to a pouring system and its design method for stable mold filling without air gaps and effective control of entrained gas and slag, and its design method, which is generally applicable to sand molds of non-ferrous metals, ferrous metals, high-temperature alloys, etc. Gating system design for foundry, metal mold casting, slab pouring and investment casting. Background technique [0002] Traditional gating system design is usually closed (pressurized) and open (unpressured) two methods. The cross-sectional area of ​​the sprue, runner, and ingate of the closed gating system gradually decreases, the flow rate of the molten metal is too fast, the turbulence is serious, and it is easy to wash the mold, causing air entrainment and inclusion defects (X-ray observation shows that full When the type velocity is greater than 0.5m / s, it is easy to cause turbulence and air entr...

Claims

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Application Information

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IPC IPC(8): B22D37/00B22C9/08
Inventor 傅排先康秀红李殿中夏立军李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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