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Casting process for crankshaft

A casting process and crankshaft technology, which is applied to crankshafts, manufacturing tools, casting molding equipment, etc., can solve the problems that the precision of castings cannot be effectively guaranteed, the hardness of castings is not enough, and there are many casting processes, so as to avoid quality defects, ensure the quality of castings, The effect of reducing production costs

Inactive Publication Date: 2015-07-01
QINGDAO YUGUANG PRECISION CASTING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The crankshaft is composed of the main journal, the connecting rod journal, the crankshaft arm, the balance weight, the front axle end and the rear axle end. One of the connecting rod journals, the crank arms at both ends and the front and rear main journals are combined together, which is called crankshaft. Turn, in the current pouring process of the crankshaft, the hardness of the finished casting is not enough, not only the casting process is more, which affects the production capacity, but also the precision of the casting cannot be effectively guaranteed, and the scrap rate is high

Method used

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Embodiment

[0017] The casting process of the crankshaft of the present embodiment comprises the following steps:

[0018] (1) Resin sand is used as raw material, and its composition percentage is as follows: resin 1%; curing agent 0.4%; the rest is molding sand;

[0019] (2) Use the resin sand to make a sand mold, and form a resin sand mold after matching the mold box, and the axis line of the resin sand mold is parallel to the horizontal plane during production, and the axis line of the resin sand mold after completion Perpendicular to the horizontal plane, the resin sand mold forms a sprue of ￠45mm and an ingate of ￠40mm into a single pour, and the sprue and the ingate are connected through a horizontal track;

[0020] (3) For the production of pouring liquid, the percentage content of the chemical composition of the raw materials is as follows: C: 3.5%; Si: 2.1%; Mn: 0.55%; P: 0.07%; S: 0.02%; Mg: 0.036%; Re: 0.014 %; Cu: 0.5% or Sn: 0.06%; the rest is Fe;

[0021] (4) Heat the abov...

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Abstract

The invention discloses a casting process for a crankshaft. The casting process comprises a molding process and a smelting and casting process. The molding process comprises the following steps of: adopting resin sand for molding, wherein the resin sand comprises 1% of resin, 0.4% of a curing agent and the balance of molding sand; performing transverse molding during the molding, and after mould arrangement and mould assembly, lifting the whole mould vertically to form a resin sand mould. The smelting and casting process comprises the following steps of: preparing casting liquid by using C, Si, Mn, P, S, Mg, Re, Cu, Sn and Fe as raw materials according to a certain percentage; fully melting the raw materials to form molten iron; placing a spheroidizing agent and an inoculant into a ladle, pouring molten iron into the ladle for spheroidizing and inoculating to form the casting liquid; and pouring the casting liquid into the resin sand mold to form a crankshaft casting after solidification. Through the casting process provided by the invention, the defective rate of crankshaft products is low, the qualification ratio reaches 99% or above, and all properties can reach the standards.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a casting process of a crankshaft. [0003] Background technique [0004] The crankshaft is composed of the main journal, the connecting rod journal, the crankshaft arm, the balance weight, the front axle end and the rear axle end. One of the connecting rod journals, the crank arms at both ends and the front and rear main journals are combined together, which is called crankshaft. Turns out, in the current pouring process of the crankshaft, the hardness of the finished casting is not enough, not only the casting process is more, which affects the production capacity, but also the precision of the casting cannot be effectively guaranteed, and the scrap rate is high. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems in the prior art, the object of the present invention is to provide a crankshaft ...

Claims

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Application Information

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IPC IPC(8): C22C37/10B22C9/08B22D1/00F16C3/08
Inventor 陈玉光
Owner QINGDAO YUGUANG PRECISION CASTING FACTORY
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