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Casting method of crank case

A crankcase and spindle box technology, which is applied to casting molding equipment, molds, mold components, etc., can solve the problems of shrinkage porosity and uneven cooling speed, and achieve the possibility of eliminating shrinkage porosity, consistent cooling speed, and improved castings. quality effect

Inactive Publication Date: 2015-09-02
LIUZHOU BAITIAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a crankcase casting method to solve the problem that the existing crankcase casting is prone to shrinkage due to uneven cooling speed at the intersection of thickness and thickness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A crankcase casting method, the chemical composition of the crankcase is: C: 2.6%; Si: 1.6; Mn: 0.4%; S: 0.06%; Cr: 0.5%; Cu: 0.8%; Sn: 0.03 %; the rest is Fe;

[0014] Including the following steps:

[0015] A. Heat and smelt the above raw materials into molten metal at a melting temperature of 1480°C to 1500°C. After removing the slag, pour it into the ladle, and then put it into the holding furnace for heat preservation;

[0016] B. When the molten metal reaches 1420°C to 1450°C, put the molten metal into the ladle, add an inoculant 75Si to inoculate the molten metal, remove the slag quickly after the inoculation, and pour overnight;

[0017] C. Pouring pouring fluid into the sand mold through the gate, the pouring temperature is 1320°C-1330°C, and the spindle box is obtained after solidification; place a cold iron at the intersection of the thickness and thickness of the crankcase mold in the sand mold.

Embodiment 2

[0019] A crankcase casting method, the chemical composition of the crankcase is: C: 3.2%; Si: 2.2%; Mn: 1%; S: 0.08%; Cr: 1%; Cu: 1.0%; Sn: 0.03%; the rest is Fe;

[0020] Including the following steps:

[0021] A. Heat and smelt the above raw materials into molten metal at a melting temperature of 1480°C to 1500°C. After removing the slag, pour it into the ladle, and then put it into the holding furnace for heat preservation;

[0022] B. When the molten metal reaches 1420°C to 1450°C, put the molten metal into the ladle, add an inoculant 75Si to inoculate the molten metal, remove the slag quickly after the inoculation, and pour overnight;

[0023] C. Pouring pouring fluid into the sand mold through the gate, the pouring temperature is 1320°C to 1330°C, and the spindle box is obtained after solidification; place a cold iron at the intersection of the thickness and thickness of the crankcase mold in the sand mold.

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Abstract

The invention discloses a casting method of a crank case. The crank case is produced from the following chemical components in percentage by weight: 2.6%-3.2% of C, 1.6%-2.2% of Si, 0.4%-1% of Mn, 0.06%-0.08% of S, 0.5%-1% of Cr, 0.8%-1% of Cu, 0.03% of Sn and the balance of Fe. The casting method comprises the operation steps: A, heating and melting the raw materials into a metal liquid at the melting temperature of 1480 DEG C-1500 DEG C; B, putting the metal liquid into a ladle when the metal liquid reaches 1420 DEG C-1450 DEG C, adding a nucleating agent, nucleating the metal liquid so as to obtain a casting liquid; and C, casting the casting liquid to a sand mold from a sprue at the casting temperature of 1320 DEG C-1330 DEG C, and condensing so as to obtain the crank case. Compared with the prior art, the problem of shrinkage porosity due to uneven cooling speed at the thickness junction part when the existing crank case is cast can be solved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting method for a crankcase of a large compressor. Background technique [0002] Large compressor crankcase The main shaft box is one of the important parts of the compressor. The weight of the casting is relatively large, and the difference between the thickest part and the thinnest part of the casting wall thickness is about 3 times; The stiffeners of the crankcase and the junction of thick and thin walls are prone to shrinkage, and the finished product will develop cracks after a period of use, resulting in oil leakage or even serious oil leakage. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a crankcase casting method to solve the problem of uneven cooling rate and easy shrinkage at the intersection of thickness and thickness in the existing crankcase casting. [0004] The technical solution adopted by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22C22C38/60B22D27/04
Inventor 谭皓原
Owner LIUZHOU BAITIAN MACHINERY
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