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Three-dimensional part printing method

A technology of 3D printing and parts, applied in the field of 3D printing parts, to achieve the effects of strong operability, meeting the preparation requirements, and wide application range

Inactive Publication Date: 2015-11-18
王海英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to provide a method for 3D printing parts, which solves the problem of forming blanks with complex shapes without molds using metal slurry as raw material, and the problem of 3D printing at room temperature or low temperature (<100°C). The invented method of 3D printing parts has strong operability, stable process and broad application prospects

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preparation example Construction

[0067] The preparation process of metal slurry suitable for 3D printing includes: glue solution preparation and metal slurry preparation.

[0068] To prepare metal slurry suitable for 3D printing, it is necessary to solve the four major problems of solid-liquid compatibility (physical and chemical mutual compatibility), fluidity, solid phase content and curing time. Through practice, the following two (water-based and organic-based) gel system glues can be used to prepare qualified metal slurry. The preparation process is divided into two parts: glue solution preparation and metal slurry preparation.

[0069] Use two kinds of glue (water-based and organic-based gel system) to prepare metal slurry with low viscosity and high solid phase content as the raw material for 3D cold printing. The phase content is higher than 50 vol.%. The metal slurry should meet the performance requirements of 3D printing equipment such as pressure storage, pressure delivery, and rapid curing.

[0...

Embodiment 1

[0105] Implementation example 1: Using 3D cold printing technology to prepare cemented carbide end mills

[0106] 1. Preparation of cemented carbide slurry

[0107] Two liquids, 45wt.% hydroxyethyl methacrylate (HEMA) and 55wt.% toluene, were evenly stirred at room temperature to prepare a glue solution.

[0108] Add cemented carbide powder with a particle size of 5 μm into the organic glue, fully stir to make a metal slurry with a solid phase content of 50vol.%, add 0.01wt.% oleic acid as a dispersant, and add 0.2wt% of the slurry % N,N'-dimethylaniline is used as a catalyst, so that the viscosity of the slurry is 1 Pa·s, and the metal slurry is prepared.

[0109] benzoyl peroxide (BPO) as an initiator with 0.1 wt% of the slurry mass and 0.2 wt.% toluene as the slurry mass were stirred evenly at room temperature and used as a chemical curing agent for later use.

[0110] Remove air bubbles in 3D cold printing metal slurry and chemical curing agent by vacuum negative pressur...

Embodiment 2

[0118] Implementation example 2: Using 3D cold printing technology to prepare stainless steel ellipsoid parts

[0119] 1. Preparation of stainless steel slurry

[0120] Add 38wt.% N,N-dimethylbisacrylamide (MBAM) to 62wt.% acrylic acid and mix, then add deionized water with a total mass of acrylic acid and MBAM of 25wt.%, stir well at room temperature, and prepare Glue.

[0121] Add stainless steel powder with a particle size of 110 μm into the glue to make a metal slurry with a solid phase content of 60vol.%, add 0.02wt.% oleic acid as a dispersant to make the slurry viscosity 0.8Pa·s, add Hexamethylenetetramine (HMTA) adjusts the pH to 4, fully stirs at room temperature, and degasses under pressure to complete the preparation of the stainless steel slurry.

[0122] 2.3D cold printing stainless steel ellipsoid parison

[0123] According to the comprehensive consideration of the shrinkage ratio and solid content of stainless steel, the model is enlarged by 1.6 times the act...

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Abstract

The invention provides a three-dimensional part printing method. The method comprises the following steps that firstly, metal slurry is prepared; secondly, parameters of a parison model are designed; thirdly, a parison is printed in a three-dimensional manner and solidified in an entire manner, wherein the third step comprises that the metal slurry is placed in a stock bin of a slurry pressure storing and quantitative feeding system of a three-dimensional printing device; the metal slurry is conveyed to the portion of a slurry three-dimensional printing spraying head of the three-dimensional printing device through the slurry pressure storing and quantitative feeding system in a channelized manner; according to a scanning route of each layer, the slurry three-dimensional printing spraying head is controlled to squeeze out the metal slurry, micro-cell three-dimensional stacking building is carried out on a printing platform of the three-dimensional printing device, and during the stacking building, thermal initiation solidifying and / or chemical solidifying initiation are / is carried out; fourthly, degumming is carried out on a solidifying type parison, and solvent and a rubber matrix are removed; and fifthly, sintering is carried out, and a metal part which is in a target shape is obtained. According to the method, the operability is strong, the technology is stable, and the wide application prospect is achieved.

Description

technical field [0001] The invention provides a powder forming technology with a wide application range, belongs to the technical field of preparing metal parts with complex shapes in the powder metallurgy production process, and particularly relates to a method for 3D printing parts. Background technique [0002] 3D printing technology integrates mechanical engineering, CAD, reverse engineering technology, layered manufacturing technology, numerical control technology, material science, and laser technology. It solves the limitations of traditional processing technology on product shape and manufacturing, and can automatically, directly and quickly , Accurately transform design ideas into corresponding prototypes or parts. The use of 3D printing technology can solve the problem of forming products with complex shapes. The 3D printing technology currently applied to metal powder is mainly laser sintering technology. At the same time, special shape parts are formed. This met...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/115
Inventor 王海英吴成义柏鉴玲郭雷辰张欣悦芦博昕罗俊
Owner 王海英
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