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A Forming Method of Adaptive Gradient Printing of Sand Mold

A self-adaptive, sand molding technology, applied in the direction of casting mold components, cores, molds, etc., can solve the problems of large gas generation, casting pore defects, and reduced air permeability, so as to achieve good gas generation and gas permeability, and meet strength requirements Effect

Active Publication Date: 2020-08-11
BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the sand mold strength of sand inkjet printing is often lower than that of manual molding. In order to meet the demand for sand mold strength, the injection amount of resin binder is usually more, and the sand mold made from this has increased gas generation and lower air permeability. , poor collapsibility and other shortcomings
The large amount of gas generation will cause porosity defects in the casting, and even the pouring cannot be completed

Method used

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  • A Forming Method of Adaptive Gradient Printing of Sand Mold
  • A Forming Method of Adaptive Gradient Printing of Sand Mold
  • A Forming Method of Adaptive Gradient Printing of Sand Mold

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Experimental program
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Embodiment Construction

[0022] Such as figure 1 The three-dimensional model of a certain sand mold is shown, taking this as an example, the specific operation steps are as follows:

[0023] 1. Convert the 3D CAD model of the sand mold into a file in STL format for slicing and layering to obtain the profile information of the section of each layer;

[0024] 2. According to the requirements of the casting process such as the strength and air permeability of different parts of the sand mold, determine the amount of resin in different parts of the sand mold, and convert it into a gray value to obtain the gray value information of each layer section. Such as figure 2 and image 3 The diagrams shown are the gradient printing diagrams of the upper and lower parts of the sand mold with different wall thicknesses. Since the inner and outer surface contours of the sand mold require higher strength, more inkjet volume is required, and the printing grayscale is higher. The central part of the sand mold has l...

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Abstract

Disclosed is a method for forming a sand mold by means of self-adaptive gradient printing. The method comprises the following steps: firstly slicing and layering a three-dimensional CAD model of a sand mold, obtaining profile information about a section of each layer, and in conjunction with casting process requirements, such as the intensity and the air permeability of the sand mold, determining the resin content of different parts of the sand mold and obtaining grayscale value information about the section of each layer; premixing sand with a solidification agent, and feeding the mixture to a sanding hopper, and moving the sanding hopper to uniformly lay molding sand with a thickness of one layer; moving a printing device, and according to the profile information and grayscale information about the section of the current layer, carrying out printing with different grayscales for molding sand laid at each layer; and laying sand layer by layer, and carrying out grayscale printing layer by layer until a complete sand mold is finally formed by means of layer-by-layer staking and solidification.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a rapid prototyping method for a moldless casting mold. Background technique [0002] 3D printing technology, also known as three-dimensional printing technology, refers to the technology of using print heads, nozzles or other printing technologies to deposit materials to manufacture objects. It belongs to a kind of additive manufacturing technology and is an important direction of current research in the field of rapid prototyping. It refers to the combination of converting the complex three-dimensional model of the required shaped workpiece into a simple two-dimensional section through slicing. Use material powder to print layer by layer, accumulate layer by layer, and form a 3D model with any complex structure from bottom to top. [0003] Sand inkjet printing is a rapid prototyping technology mainly based on droplet jet forming. The sand mold printing technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B33Y10/00B33Y80/00
CPCB22C9/02B33Y10/00B33Y80/00
Inventor 刘丰单忠德赵蒙蒙
Owner BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD