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Vacuum negative pressure real type phenolic sand molding lost foam casting method

A technology of lost foam casting and vacuum negative pressure, which is applied in casting equipment, casting molding equipment, casting molds, etc., can solve the problems of increasing production costs, achieve the effects of increasing strength, good air permeability, and improving casting precision

Inactive Publication Date: 2009-01-14
QUEJING CHENGJIE SHIXIN FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method plays a role in preventing casting failure caused by sand collapse, the model shell must be made separately, which increases the difficulty in the process and increases the production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The lost foam casting method of vacuum negative pressure compact resin sand molding according to the present invention mainly includes the steps of mold making, coating, sand box molding, vibration, pouring, vacuuming, heat preservation and cooling, and the casting steps are:

[0022] a. Make a foam plastic model according to the shape of the casting;

[0023] b. The outer surface of the foam plastic model is coated with foam paint;

[0024] c. Put the foamed plastic model after the paint is air-dried in the sand box, and mold it with resin sand. The resin sand is 90 mesh dry sand mixed with adhesive, and the weight ratio of dry sand and adhesive is 8:1 , the adhesive is a mixture of water glass, dextrin and resin;

[0025] d. The molded sand box is placed on the vibrating device to vibrate the molding sand in the box, and carbon dioxide gas is introduced to dry the resin sand;

[0026] e. Pouring molten iron, while pouring, use a 37KW vacuum pump to vacuumize the san...

Embodiment 2

[0029] The lost foam casting method of vacuum negative pressure compact resin sand molding according to the present invention mainly includes the steps of mold making, coating, sand box molding, vibration, pouring, vacuuming, heat preservation and cooling, and the casting steps are:

[0030] a. Make a foam plastic model according to the shape of the casting;

[0031] b. The outer surface of the foam plastic model is coated with foam paint;

[0032] c. Put the foam plastic model after the paint is air-dried in the sand box, and use resin sand for molding. The resin sand is mixed with 80 mesh dry sand and adhesive. The weight ratio of dry sand and adhesive is 8.5:1 , the adhesive is a mixture of water glass, dextrin and resin;

[0033] d. The molded sand box is placed on the vibrating device to vibrate the molding sand in the box, and carbon dioxide gas is introduced to dry the resin sand;

[0034] e. Pouring molten iron, while pouring, use a 37KW vacuum pump to vacuumize the ...

Embodiment 3

[0037] The lost foam casting method of vacuum negative pressure compact resin sand molding according to the present invention mainly includes the steps of mold making, coating, sand box molding, vibration, pouring, vacuuming, heat preservation and cooling, and the casting steps are:

[0038] a. Make a foam plastic model according to the shape of the casting;

[0039] b. The outer surface of the foam plastic model is coated with foam paint;

[0040] c. Put the foamed plastic model after the paint is air-dried in the sand box, and use resin sand for molding. The resin sand is mixed with 100 mesh dry sand and adhesive, and the weight ratio of dry sand and adhesive is 9:1 , the adhesive is a mixture of water glass, dextrin and resin;

[0041] d. Place the molded sand box on the vibrating device to vibrate the molding sand in the box, and pass in carbon dioxide gas to dry the resin sand;

[0042] e. Pouring molten iron, while pouring, use a 37KW vacuum pump to vacuumize the sand ...

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Abstract

The present invention relates to a method for casting a vacuum sub-pressure solid resin sand molding lost mould, and belongs to the casting technical field, in particular relates to a method for casting a vacuum sub-pressure lost mould, which mainly comprises the steps such as molding, coating, sand-box patternmaking, tapping, pouring, vacuum pumping, heat preservation and cooling, and adopts the casting steps: a. foam plastic mould is made according to the shape of the casting piece; b. the outer surface of the foam plastic mould is coated with coating; c. the foam plastic mould that is coated with coating is arranged inside a sand box, and the patternmaking is performed with resin sand; d. the sand box after the patternmaking is arranged inside a tapping device so as to tap the patternmaking sand inside the box and to be dried; e. while pouring the iron liquid, the sand box is vacuum pumped synchronically by a vacuum pumping machine, and the gas that is obtained from the vacuum pumping is discharged after being purified; f. after the pouring is completed, the vacuum pumping is stopped, and the casting piece is taken out to be arranged inside a heat-preservation oven, so that the temperature is increased to 1100 DEG C, and the casting piece can be produced after the heat preservation and cooling. The method of the present invention has simple process, precise processing, easy operation and low production cost.

Description

technical field [0001] The invention relates to a casting technology, in particular to a casting method of vacuum negative pressure lost foam. Background technique [0002] Lost foam casting is called vacuum solid core casting in my country, American is called lost foam and gasification foam casting, and it is called EPC process internationally. Lost foam casting is to replace metal and wooden molds with foam models. After modeling, the foam model is not taken out, and it is a solid cavity, that is, a foam model that is completely similar to the shape of the casting is retained in the mold. The conventional lost foam casting method is adopted. Iron After the liquid is poured into the sand box, the foam burns and gasifies under the high temperature environment of molten iron. At present, the common lost foam casting method is to use polystyrene and other mixed foam materials to make a model consistent with the casting, and place the model in the sand box Fill in dry sand, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02B22C9/02B22C9/12B22D35/04B22D30/00
Inventor 曹怀平
Owner QUEJING CHENGJIE SHIXIN FOUND
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