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Method and device for manufacturing and forming metal material additives

A technology of additive manufacturing and metal materials, applied in the field of material processing, can solve problems such as research difficulties in micro-melting casting technology, achieve low processing cost, less internal defects, and improve mechanical properties

Inactive Publication Date: 2019-01-25
PINGDINGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metal melt system is multi-phase and its phase composition is constantly changing. The viscosity of the melt is very sensitive to temperature changes. The micro-melting casting technology requires the flow of the metal melt raw materials used to be controllable and form a good bond between layers. It has brought great difficulties to the research of micro-melting casting technology

Method used

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  • Method and device for manufacturing and forming metal material additives
  • Method and device for manufacturing and forming metal material additives
  • Method and device for manufacturing and forming metal material additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The metal material additive manufacturing molding method of the present invention comprises the following steps:

[0025] 1) Obtain the flowing liquid material from the smelting furnace and introduce it into the middle flow channel with the outlet below;

[0026] 2) By controlling the temperature and flow velocity of the liquid material, the liquid material entering the middle flow channel is gradually transformed into a fluid in which the liquid-solid two-phase coexists and its temperature is distributed with a high gradient and a low gradient;

[0027] 3) Press the above-mentioned fluid material through the discharge port into the open forming area between its lower part and the substrate (crystallizer) or the accumulation layer attached to it, and use surface tension to constrain it in this space;

[0028] 4) While the fluid in contact with it is directional solidified in the direction of the incoming flow, the substrate (crystallizer) is moved parallel to the outlet...

Embodiment 2

[0032] The metal material additive manufacturing molding method of this embodiment differs from Embodiment 1 in that: in order to prepare a metal member with a complex structure and a thickness perpendicular to the tangential direction greater than the thickness of the tangential single-layer structure, according to the performance of the member and the Accurate design requirements, design the slicing direction and slicing thickness of the three-dimensional digital slicing graphics of the parts to be manufactured, and set the movement track of the crystallizer, process and accumulate the above-mentioned solidified structure layer by layer and achieve a good interlayer interface Combination; substrate (crystallizer) The movement speed of the crystallizer is controlled within the range of no more than 0.5-20 cm / s.

[0033] The movement speed of the crystallizer is controlled within the range of no more than 0.5-20 cm / s. This speed range blocks and destroys the growth of primary d...

Embodiment 3

[0036] The metal material additive manufacturing forming method of this embodiment is different from Embodiment 1 and Embodiment 2 in that: the temperature and flow velocity of the liquid material are controlled to make the liquid metal material a fluid with better fluidity, and at the same time The fluid has a certain viscosity, which can make the fluid perfectly formed; for the non-eutectic alloy, control its solid phase ratio to not exceed 35%; for the eutectic alloy, control the fluid at the outlet to have a certain fluidity.

[0037] In this way, the metal fluid material required for the additive manufacturing of metal materials is prepared. Usually, the semi-solid metal melt has a certain viscosity and fluidity, and the alloy raw material of the metal material additive manufacturing forming method of the present invention is based on the semi-solid raw material.

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Abstract

The invention discloses a method for manufacturing and forming metal material additives. The method includes acquiring flowing liquid-state materials from a smelting furnace and leading the flowing liquid-state materials into a middle flow channel; controlling the temperatures and the flow velocities of the liquid-state materials to gradually transform the liquid-state materials in the middle flowchannel into liquid-solid two-phase coexistence fluid; pushing fluid materials into open forming intervals and restraining the fluid materials in the spaces by the aid of surface tension; directionally solidifying the fluid, which is in contact with a substrate / crystallizer, towards inflow directions, simultaneously allowing the substrate / crystallizer to move at certain speeds in certain movementtracks in parallel to discharge outlets, bringing out solidification structures, inhibiting growth of metal dendrites at the front edges of crystals by the aid of frictional force between the solidification structures and melt, repeatedly carrying out the procedures, and gradually forming tangential single-layer structures in specific directions for integral metal wall plates until material components provided with excellent structures with specified thicknesses in specified shapes. A device for manufacturing and forming the metal material additives comprises the smelting furnace, the middleflow channel, the substrate / crystallizer and a protective atmosphere device.

Description

technical field [0001] The invention relates to material processing technology, in particular to an additive manufacturing molding method and device for preparing integral wallboard-like thin-walled metal material components by micro-melting casting. Background technique [0002] Metal additive manufacturing (also known as 3D printing) technology can directly form metal parts with complex structures and shorten the manufacturing cycle of parts, which is of great significance for improving the modernization level of manufacturing industry and establishing a green economic development model. Highly valued by the world and engineering circles. Metal additive manufacturing technology uses metal powder or wire as raw material, melted by a high power density point heat source (such as laser, electron beam, etc.), and then accumulates it point by point and layer by layer to obtain parts with a certain shape. The properties of the part are then adjusted by rapid cooling and necessa...

Claims

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Application Information

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IPC IPC(8): B22D23/00B33Y10/00B33Y30/00
CPCB22D23/00B33Y10/00B33Y30/00
Inventor 罗晓强韩永军李青彬薛灵伟胡小明
Owner PINGDINGSHAN UNIVERSITY
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