A method for producing as-cast Qt950-4 crankshaft by using all scrap steel

A technology of all scrap steel and crankshaft, which is applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems of long production cycle, easy deformation of heat treatment castings, large investment, etc., to solve deformation oxidation, reduce labor cost and power consumption Effect of low cost and impurity content

Active Publication Date: 2020-12-11
云南云内动力机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used grades of crankshafts are QT700-2 and QT800-2. With the development of diesel engines for cars, the crankshafts of diesel engines for cars are relatively small, and higher requirements are placed on the strength and toughness of crankshafts; traditional crankshafts are produced using normalizing processes to obtain corresponding materials. Large investment, long production cycle, easy deformation of heat treatment castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for producing cast QT950-4 crankshafts using all scrap steel, comprising the following steps:

[0019] (1) Raw material selection: select the plate-shaped steel head (scrap steel) produced by the steel structure factory and the returned material produced by the pouring system during the pouring process as the raw material. The material of the raw material is Q235 and / or Q345, and the average Mn in the raw material is The content is 0.3~0.8%;

[0020] (2) Ingredients: take 1100kg of scrap steel and 200kg of furnace charge;

[0021] (3) Smelting: Add the raw materials gradually into the intermediate frequency electric furnace to raise the temperature to smelt the molten iron. During the heating process, add 41kg of low-sulfur carburizer and 13kg of silicon carbide. After the molten iron is melted to 1500°C, samples are taken to analyze the chemical composition of the molten iron with a direct-reading spectrometer, and 10kg of ferrosilicon alloy, 10kg of electrol...

Embodiment 2

[0028] (1) Raw material selection: choose the plate-shaped steel head produced by the steel structure factory and the returned material produced by the pouring system during the pouring process as raw materials. The material of the raw material is Q235 and / or Q345, and the average Mn content in the raw material is 0.3~ 0.8%;

[0029] (2) Ingredients: take 970kg scrap steel, 330kg recycle material

[0030] (3) Smelting: Add the raw materials gradually into the intermediate frequency electric furnace to raise the temperature to smelt the molten iron. During the heating process, add 37kg of low-sulfur recarburizer and 8kg of silicon carbide. After the molten iron is melted to 1500°C, samples are taken to analyze the chemical composition of the molten iron with a direct-reading spectrometer, and 10kg of ferrosilicon alloy, 8.5kg of electrolytic copper, and 0.6kg of ferrochromium alloy are added, and the manganese content does not need to be adjusted within the process range; after...

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Abstract

The invention belongs to the technical field of material forming, and particularly relates to a method for producing a casting-state QT950-4 crankshaft through full scrap steel. The method for producing the casting-state QT950-4 crankshaft through full scrap steel comprises following steps of raw material selection, burdening, smelting, chemical part control, spheroidization and inoculation, sandlined metal mold casting and box opening. Plate-shaped steel stub bars are adopted, the raw material quality is ensured, and it is ensured that the impurity content in the raw material is low, and thesource is stable.

Description

technical field [0001] The invention belongs to the technical field of material forming, and in particular relates to a method for producing a cast QT950-4 crankshaft by using all scrap steel. Background technique [0002] As we all know, the crankshaft is the most important part of the engine. It bears the force transmitted by the connecting rod and converts it into torque through the crankshaft output and drives other accessories on the engine to work. The crankshaft is affected by the centrifugal force of the rotating mass, the periodically changing gas inertial force and the reciprocating inertial force, so that the crankshaft is subjected to bending and torsional loads. As the power of the diesel engine continues to increase, the requirements for the crankshaft, the heart part of the diesel engine, are getting higher and higher. At present, the commonly used grades of crankshafts are QT700-2 and QT800-2. With the development of diesel engines for cars, the crankshafts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/10B22C9/06B22D1/00C21C7/06
CPCB22C9/068B22D1/00C21C7/06C22C33/10C22C37/06C22C37/10Y02P10/20
Inventor 李静文李建林赖青华冯志琼陈丽阳
Owner 云南云内动力机械制造有限公司
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