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Engine cylinder block cast casting method

A technology for engine cylinder blocks and castings, applied in the field of castings, can solve problems such as poor tensile strength and hardness uniformity, achieve the effects of reducing wall thickness sensitivity, reducing microstructure differences, and improving mechanical properties

Inactive Publication Date: 2014-02-19
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies in the background technology, the purpose of the present invention is to overcome the defects of the background technology and provide a casting method for engine block castings, which can solve the problems of poor tensile strength and hardness uniformity of existing castings, and at the same time the casting The stability of mechanical properties has been greatly improved

Method used

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  • Engine cylinder block cast casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the smelting furnace, the metal charge is melted into molten iron. When the temperature of the molten iron reaches 1520-1550°C, it is poured into the ladle from the smelting furnace. Within a fourth period of time, the A inoculant with a weight of 0.3% of the total weight of the molten iron and a particle size of 0.2-0.6 mm is evenly and dispersedly sprinkled on the liquid flow through a quantitative funnel, and the molten iron is inoculated for the first time in the ladle; When the temperature of the molten iron is 1400-1420°C, inject the molten iron from the ladle into the casting cavity, from the injection amount of the molten iron being one quarter of the total weight of the molten iron to the four fifths of the total weight of the molten iron Within a certain period of time, the B inoculant with a weight of 0.07% to 0.13% of the total weight of the molten iron and a particle size of 0.4 to 0.8mm is evenly and dispersedly sprinkled on the liquid flow through a qua...

Embodiment 2

[0027] The only difference from Example 1 is that the time for adding the inoculant is not limited in the first inoculation treatment and the second inoculation treatment.

[0028] The results of testing the castings produced according to the process of Example 2 are shown in Table 1-1 and 2-2.

Embodiment 3

[0030] The difference from the embodiment is only that: the one-time inoculation process in the background technology is adopted, that is, the metal charge is melted into molten iron in the smelting furnace, and when the temperature of the molten iron reaches 1520-1550 ° C, it is poured into the ladle from the smelting furnace, and the A inoculant with a weight of 0.3% of the total weight of the hot metal from the furnace and a particle size of 0.2-0.6 mm or an inoculant with a weight of 0.07% to 0.13% of the total weight of the molten iron and a particle size of 0.4-0.8 mm is placed in the ladle in advance. At the bottom, when the molten iron is poured into the ladle, an inoculation treatment is carried out in the ladle, and after inoculation treatment, it is poured into the cavity of the casting and cast into shape. Wherein, all parameters of A inoculant or B inoculant are consistent with those in Example 1.

[0031] The casting results produced according to the process of E...

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Abstract

The invention provides an engine cylinder block cast casting method. The engine cylinder block cast casting method is characterized in that metal-stream inoculation is carried out twice, and the time when a nucleating agent is added, the usage amount of the nucleating agent, the particle size and temperature of the nucleating agent, constituents of the nucleating agent and the mass percents of the constituents are controlled in each time of metal-stream inoculation. By means of the method, the problem that an existing cast is poor in tensile strength and uniformity of hardness can be solved, the metallographic phase, hardness, mechanical performance and other properties of the cast are greatly improved, and the mechanical property stability of the cast is greatly improved.

Description

technical field [0001] The invention relates to a casting casting method, in particular to a casting method of an engine cylinder casting. Background technique [0002] Cylinder block is the key component of the automobile engine and one of the most important working parts in the engine work. With the continuous increase of the horsepower of the truck, the engine power needs to be continuously improved, and the country's emission requirements are becoming more and more stringent. The various loads borne by the engine are increasing sharply, making the engine develop in the direction of high speed, strengthening, and long life. Therefore, more stringent requirements are put forward for the design and material performance of the engine cylinder block, especially the material performance will directly affect the engine. various performances. [0003] The internal structure of the cylinder block is complex, and most of them are cast by liquid casting hydraulic technology. Bott...

Claims

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Application Information

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IPC IPC(8): B22D1/00
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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