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Model mold drawing method for casting

A technology of model and draft angle, applied in casting molding equipment, mold, mold composition, etc., can solve problems such as insufficient strength of wood products, model remaining in sand mold, sand mold damage, etc.

Active Publication Date: 2019-07-19
DALIAN JINHE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, due to product or process requirements, some models have a small draft angle, or require no draft angle, and the outer wall of the model is basically approximately vertically arranged in the sand box. When drafting, the model and the sand mold It is always in friction, and the molding sand used in casting contains binder and has a certain degree of viscosity. Therefore, when the draft angle is small or there is no draft angle, and the model is buried deep in the sand, it may cause failure. It is difficult to pull out the model, and the existing models are mostly made of wooden models. The strength of wood products is not enough, and it is easy to break due to the failure to pull out smoothly during the drawing process, so that part of the model remains in the sand mold, causing damage to the model or even Sand mold damage affects casting production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Model drafting method for casting, which is applied in the drafting process of models whose draft angle is less than 1° or requires no draft angle. A layer of paper is attached to the outer surface of the model, and the model and paper are put into the sand box together. , pull out the model after sand washing and shaping. When the model is pulled out, due to the stickiness of the sand mold, the paper is separated from the model, and the model can be pulled out smoothly due to the small friction with the paper. The paper is left on the inner wall of the sand mold and can be torn off manually.

[0018] Further, the thickness of the paper is 60-80 μm.

[0019] The so-called attachment refers to pasting the paper on the outer surface of the model in some unstable ways, such as using adhesive tape to fix several places on the paper, or pasting the paper on the model at the corner with paste, and other possible methods way and so on. This type of sticking keeps the paper o...

Embodiment 2

[0023] The casting model drafting method is applied to the drafting process of the model whose draft angle is less than 1° or requires no draft angle. A layer of lost foam sheet is nailed on the outer surface of the model to connect the model with the lost foam. The mold sheets are put into the sand box together, and the model is pulled out after sand washing and shaping. When the model is pulled out, due to the viscosity of the sand mold, the lost foam sheet is separated from the model, and the model is pulled out together with the nails. The nails on the model scratch the lost foam sheet, and the scratched lost foam sheet is left on the inner wall of the sand mold. , can be torn off manually.

[0024] Further, the thickness of the lost foam sheet is 2-3mm. The corresponding part of the model can be correspondingly reduced by 2-3mm or the size of the model remains the same. Due to the relatively large size of large castings, the performance of the entire casting will not be...

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Abstract

The invention belongs to the technical field of casting, and particularly relates to a model mold drawing method for casting. A layer of isolating sheet is attached to the outer surface of a model, the model and the isolating sheet are placed in the sand box together, the model is pulled out after sand washing and shaping, after the mold drawing is completed, and the isolating sheet left on the sand mold is separated from the sand mold. According to the mold drawing method provided by the invention, the inclination of the mold drawing model can be small or the mold drawing inclination is not required, the model can be smoothly separated from the sand mold, and when the model is buried in sand and can not be used for drawing.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a casting model drafting method. Background technique [0002] Usually in the casting process, the model is first put into the sand box, the sand is washed to form a sand mold, and then the model is taken out of the sand mold, that is, the drafting process. Generally speaking, in order to make the model easy to pull out, the model is generally made into a wedge shape with a wide top and a narrow bottom, so that it has a certain draft slope. When drawing the mold, the model and the sand mold only have friction at the very first moment. , as long as the model is pulled out for a short distance, the outer wall of the model and the inner wall of the sand mold will be separated. However, in actual production, due to product or process requirements, some models have a small draft angle, or require no draft angle, and the outer wall of the model is basically approximately v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/00B22C9/02B22C23/00
CPCB22C7/00B22C9/02B22C23/00
Inventor 马广华吕芳遂于祥增
Owner DALIAN JINHE CASTING
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