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Self-adaptation sand mould gradient printing forming method

A self-adaptive, sand-molded technology, applied in the directions of mold composition, mold, core, etc., can solve the problems of casting blowhole defects, large gas generation, poor collapsibility, etc., to meet the strength requirements, good gas generation and air permeability. Effect

Active Publication Date: 2018-02-23
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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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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  • Self-adaptation sand mould gradient printing forming method
  • Self-adaptation sand mould gradient printing forming method
  • Self-adaptation sand mould gradient printing forming method

Examples

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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 with 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 ...

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Abstract

The invention belongs to the field of rapid forming, and discloses a self-adaptation sand mould gradient printing forming method. According to the method, a sand mould three-dimensional CAD model is subjected to slicing and layering, the outline information of each layer of section is obtained, the resin content of different parts of a sand mould is determined in combination of sand mould strength, breathability and other casting technology requirements, and the grey level information of each layer of section is obtained; after sand and a curing agent are premixed, the mixture is sent into a sand paving hopper, the sand paving hopper is moved, and the moulding sand with one layer thickness is evenly laid; and a printing device is moved, printing of different grey scales is conducted on each layer of paved moulding sand according to the contour information and the grey information of the section of the current layer, layer-by-layer sand paving is conducted, layer-by-layer grey printingis conducted till layer-by-layer stacking is finally conducted and the integral sand mould is formed through solidification. The method has high printing precision, the printed sand mould can meet therequirements for integral strength and local strength, and meanwhile the sand mould integrally has good gas evolution and breathability.

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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IPC IPC(8): B22C9/02B33Y10/00B33Y80/00
CPCB22C9/02B33Y10/00B33Y80/00
Inventor 刘丰单忠德赵蒙蒙
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH