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Method for manufacturing graphite forming chilling block through hot core box

A graphite cold iron and hot core box technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problem of high production cost, achieve high production efficiency, short production cycle, and solve the effects of cumbersome production processes

Inactive Publication Date: 2018-07-10
溧阳市联华机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it needs to be customized from a professional manufacturer, especially the graphite forming curved surface cold iron needs to be processed by CNC machine tools, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] ⑴ Process the A-shaped cold iron model designed by the casting process into a hot core box mold;

[0022] (2) Add the graphite-coated sand to the sand hopper of the hot core box core making machine, and heat the hot core box mold to 250°C;

[0023] ⑶ Close the mold and shoot sand, the compressed air pressure of sand shooting is 0.5MPa, and the sand shooting time is 2s. Through the action of compressed air, the coated sand in the hot core box is compacted;

[0024] ⑷Hardening and curing, the curing temperature is controlled at 250°C, and the curing time is controlled at 90S;

[0025] (5) Open the mold and take out the graphite chilled iron core to obtain the graphite chilled iron embryo;

[0026] ⑹The graphite cold iron embryo in step ⑸ is fully solidified, baked, cooled and cleaned (baking temperature 250°C, baking time 2 hours) to obtain a finished graphite-formed cold iron product.

Embodiment 2

[0028] ⑴ Process the B-shaped cold iron model designed by the casting process into a hot core box mold;

[0029] ⑵Put the graphite coated sand into the sand hopper of the hot core box core making machine, and heat the hot core box mold to 280°C;

[0030] ⑶Closing the mold and shooting sand, the compressed air pressure of sand shooting is 0.6MPa, and the sand shooting time is 3s. Through the action of compressed air, the coated sand in the hot core box is compacted;

[0031] ⑷Hardening and curing, the curing temperature is controlled at 280°C, and the curing time is controlled at 80S;

[0032] (5) Open the mold and take out the graphite chilled iron core to obtain the graphite chilled iron embryo;

[0033] ⑹The graphite cold iron embryo in step ⑸ is fully solidified, baked, cooled and cleaned (baking temperature 280°C, baking time 1.5 hours) to obtain a finished graphite-formed cold iron product.

Embodiment 3

[0035] ⑴ Process the C-shaped cold iron model designed by the casting process into a hot core box mold;

[0036] (2) Add the graphite-coated sand into the sand hopper of the hot core box core making machine, and heat the hot core box mold to 300°C;

[0037] ⑶Closing the mold and shooting the sand, the compressed air pressure of the sand shooting is 0.5MPa, and the sand shooting time is 4s. Through the action of the compressed air, the coated sand in the hot core box is compacted;

[0038] ⑷Hardening and curing, the curing temperature is controlled at 300°C, and the curing time is controlled at 60S;

[0039] (5) Open the mold and take out the graphite chilled iron core to obtain the graphite chilled iron embryo;

[0040] ⑹The graphite cold iron embryo in step ⑸ is fully solidified, baked, cooled and cleaned (baking temperature 300°C, baking time 1 hour) to obtain a graphite-formed cold iron product.

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Abstract

The invention discloses a method for manufacturing a graphite forming chilling block through a hot core box. Graphite precoated sand is used as a coremaking material, a forming chilling block model designed through a casting process is machined into a hot core box mold, through a hot core box coremaking process, a graphite forming chilling block initial blank is obtained, and then a finished graphite forming chilling block is obtained through thorough solidifying, baking, cooling and trimming. The manufacturing method is simple, high in production efficiency and good in effect, the problem oftedious manufacturing procedures of forming chilling blocks for casting is solved, the production cycle is short, the casting defects of casting bonding and pores are effectively prevented, the production cost is reduced, the casting yield and production efficiency are improved, industrial production can be conducted easily, and the method has wide market prospects.

Description

technical field [0001] The invention belongs to the field of mechanical casting, and in particular relates to a method for making graphite-molded cold iron with a hot core box. Background technique [0002] In the pouring process of ductile iron and steel castings, due to the large solidification and shrinkage of the molten metal, it is difficult to fully feed the grain gaps, so shrinkage cavities and shrinkage defects are prone to occur on thick hot spots and isolated laps. . In the design of casting process, it is necessary to use external chill iron to control the solidification sequence of castings, reduce the modulus at hot joints, enhance the feeding ability and effect of risers, and ensure that the quality of castings meets the requirements of shrinkage porosity. According to the structural characteristics of our turbocharger turbine shell products, the casting structure is relatively complex, showing a three-dimensional curved surface streamline structure with singl...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22D27/04
CPCB22C9/10B22D27/04
Inventor 纪汉成
Owner 溧阳市联华机械制造有限公司