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No-mold fusion stacking manufacture method of parts or mold

A technology of fused lamination and manufacturing methods, applied in the direction of manufacturing tools, auxiliary welding equipment, welding equipment, etc., can solve problems such as collapse, falling and flowing of fused lamination materials, and achieve low cost, easy full density, and high forming efficiency Effect

Inactive Publication Date: 2009-02-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a moldless fusion lamination manufacturing method for parts or moulds, which solves the problems of falling, flowing, and collapse of fusion lamination materials in the process of unsupported and moldless lamination forming in existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The melting electrode gas is used to protect the deposition gun, and the welding current is 40-50A. For the forming of unsupported aluminum alloy parts with camber on the outer wall, the gravity of the material in the molten pool is calculated according to the volume of the molten pool: length x width x height x density x acceleration of gravity = (0.004m~0.006m)*(0.004m~ 0.006m)*(0.0005m~0.001m)*2.7*10 3 kg / m 3 *9.8m / s 2≈0.0002N~0.001N, that is, 0.0002N to 0.001N, make an electromagnetic induction coil with 20 turns, place it under the unsupported part of the molten pool, and adjust the current of the coil within the range of 14A~24A , generating an upward electromagnetic force that is about equal to or greater than the weight of the material in the molten pool, eliminating or inhibiting the falling of the material in the molten pool. Under this condition, the aluminum alloy wire is used to deposit and form layer by layer on the substrate according to ...

Embodiment 2

[0017] Embodiment 2: The fusion deposition gun is protected by the melting electrode gas, and the welding current is 50-60A. For the forming of unsupported stainless steel parts with camber on the outer wall, the gravity of the material in the molten pool is calculated according to the volume of the molten pool: length x width x height x density x acceleration of gravity = (0.004m~0.006m)*(0.004m~0.006 m)*(0.0005m~0.001m)*8*10 3 kg / m 3 *9.8m / s 2 ≈0.0006N~0.003N, make an electromagnetic induction coil with 20 turns, place it under the unsupported part of the molten pool, and in the range of about 15A~35A, by controlling and adjusting the current of the coil, the direction of generation is upward, An electromagnetic force approximately equal to or greater than the weight of material in the molten pool eliminates the drop of molten pool material. Under this condition, stainless steel wire is used to deposit and form layer by layer on the substrate according to the digital form...

Embodiment 3

[0018] Embodiment 3: adopt the plasma arc deposition gun of non-melting electrode gas shielded welding, welding current 60~70A, for the forming of supported iron-nickel-chromium alloy part, calculate the weight of the material in the molten pool according to the volume of molten pool : Length x width x height x density x acceleration of gravity = (0.004m~0.006m)*(0.004m~0.006m)*(0.0005m~0.001m)*8*10 3 kg / m 3 *9.8m / s 2 ≈0.0006N~0.003N, make an electromagnetic induction coil with 19 turns, place it on the side of the molten pool with support, within the range of about 4A~16A, by controlling and adjusting the current of the coil, it will generate a shock to the molten pool Electromagnetic force of side compression eliminates flow of molten pool material. Under this condition, iron-nickel-chromium alloy powder is used to form layer by layer fusion layer on the substrate according to the digital forming path obtained from the three-dimensional CAD model of the part. Due to the c...

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Abstract

The invention relates to a method for die-free fused deposition modeling of a part or a die, which belongs to the method of die-free modeling, and solves the problems of falling, flowing and collapsing of fusing material in the process of support-free and die-free fused deposition modeling of the existing method. The method comprises the following steps: (1) hierarchy slicing processing is performed to the three-dimensional CAD model of the part or the die; (2) a computer generates numerical control codes required by the shaping of each hierarchy according to the hierarchy slicing data and the characteristics of the slicing size and shape of each hierarchy; and (3) numerically controlled gas-shielded welding arc or laser bean is adopted to fuse and shape the fusing material on the base plate in sequence according to the numerical control codes of each hierarchy, until the requirements on the size and the surface of the part or the die are met; simultaneously, electromagnetic field acting on the fusing material in the melting bath is generated through an electromagnetic device. By adopting the method, the part or the die made of metal, intermetallic compound, metal ceramics, ceramics and functionally gradient material can be quickly obtained with low cost and high quality.

Description

technical field [0001] The invention belongs to the moldless growth type manufacturing method of parts and moulds. Background technique [0002] The main methods of forming high-density metal parts or molds without mold deposition include high-power cladding laser forming with high-energy beams, free electron beam forming, and plasma deposition forming. The former uses a high-power laser to melt the metal powder sent to the substrate layer by layer, and rapidly solidifies and forms layer by layer, and finally obtains a near-final shape with high forming accuracy, and the density of the workpiece is much higher than that of selective laser sintering. See A.J.Pinkkerton, L.Li, Effects of Geometry and Composition in Coaxial LaserDeposition of 316L Steel for Rapid Protyping, Annals of the CIRP, Vol.52, 1(2003), p181-184.; but the technology exists The utilization rate of efficiency, energy and materials is not high, it is difficult to achieve full density, and the equipment inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/06B23K9/04B23K26/34
Inventor 张海鸥王桂兰韦忠朝
Owner HUAZHONG UNIV OF SCI & TECH
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