Method for precinct laser sintering fast manufacture metal die

A technology of selective laser sintering and metal molds, which is applied in the direction of improving process efficiency and energy efficiency, and can solve problems such as impregnation hole defects, low strength, and easy oxidation

Inactive Publication Date: 2007-02-07
NANCHANG AERONAUTICAL ENG INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are three main methods for rapid manufacturing of metal molds by SLS. One is high-power laser sintering of single metal powder. The metal powder is scanned and sintered by high-power laser (above 1000W), and the metal powder is superimposed and formed layer by layer. The molded parts are subjected to surface post-treatment ( grinding, finishing) to complete the mold making; the second is the mixed metal powder laser sintering molding, the molding powder is a mixture of two or more metal powders, one of which has a lower melting point and acts as a binder. The shrinkage of various metals with different melting points is inconsistent, and their volume changes can be compensated for each other, so that the total shrinkage of the workpiece is small, and it must be treated after infiltration; but the metal powder of the above two methods needs to be melted under the action of the laser, and due The characteristics of SLS "rapid melting and rapid cooling" sintering, there are spheroidization and sintering shrinkage phenomena in the process of metal powder melting and sintering, the resulting thermal stress makes the sintered parts prone to warping, and the sintered parts may have some obvious sintering defects. The density is not high, and the laser power required by the laser sintering

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] This embodiment is a rapid manufacturing precision casting copper mold by selective laser sintering.

[0024] (1) Proportion of metal powders with different particle sizes: two metal Cu powders with an average size of 13 μm and 65 μm, mixed in a ratio of 1:2 mass percent;

[0025] (2) Preparation of metal copper molding powder for SLS: use silane coupling agent KH-570 to carry out surface modification treatment on metal copper powder, mix the modified metal copper powder with 6% ammonium dihydrogen phosphate powder, 8% epoxy Resin powder, 3% lithium stearate powder are evenly mixed to obtain metallic copper molding powder;

[0026] (3) SLS forming: According to the requirements of mold forming, design the three-dimensional CAD model of the mold, and slice the three-dimensional CAD model. The laser sintering process parameters are: laser power 40W, scanning speed 1500mm / s, scanning distance 0.1mm, The thickness of the powder layer is 0.15mm, and the preheating temperatu...

Embodiment 2

[0030] This embodiment is rapid manufacturing of injection molded steel molds by selective laser sintering.

[0031] (1) Proportion of metal powders with different particle sizes: two metal reduced iron powders with an average size of 20 μm and 80 μm, mixed in a ratio of 1:3 mass percent;

[0032] (2) Preparation of metal reduced iron molding powder for SLS: use silane coupling agent KH-570 to carry out surface modification treatment on metal reduced iron powder, mix the modified metal iron powder with 6% ammonium dihydrogen phosphate powder, 5% Epoxy resin powder, 3% nylon 6 powder, 3% lithium stearate powder, 1% carbon black powder are evenly mixed to obtain metal iron molding powder;

[0033] (3) SLS forming: According to the requirements of mold forming, design the three-dimensional CAD model of the mold, and slice the three-dimensional CAD model. The laser sintering process parameters are: laser power 42.5W, scanning speed 1500mm / s, scanning distance 0.1mm , the thicknes...

Embodiment 3

[0037] This embodiment is a rapid manufacturing precision casting aluminum mold by selective laser sintering.

[0038] (1) Proportion of metal powders with different particle sizes: two metal aluminum powders with an average size of 10 μm and 50 μm are mixed in a ratio of 1:4 mass percent;

[0039] (2) Preparation of metal aluminum molding powder for SLS: use silane coupling agent KH-570 to carry out surface modification treatment on metal aluminum powder, mix the modified aluminum powder with 5% ammonium dihydrogen phosphate powder, 8% epoxy resin powder, 3% lithium stearate powder, and 1% carbon black powder are uniformly mixed to obtain metal aluminum molding powder;

[0040](3) SLS forming: According to the requirements of mold forming, design the three-dimensional CAD model of the mold, and slice the three-dimensional CAD model. The laser sintering process parameters are: laser power 38W, scanning speed 1600mm / s, scanning distance 0.1mm, The thickness of the powder layer...

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Abstract

The invention relates to a method for quickly producing metal mould with laser sintering, which comprises: first, using at least two kinds of different metal powders with different diameters, to be mixed with different mass percentages; using physical or chemical modification to treat the surface of metal powder; then mixing the modified metal powders, the adhesive formed by organic resin and inorganic with different fusion points, and the lubricant uniformly to obtain the metal molding powder; then designing the three-dimension CAD mode of mould, to slice the mode, and laser sintering the metal molding powder; the laser sintered element is baked at 300-800Deg. C; using vacuum pressure penetration to penetrate the metal, to obtain the high-accuracy metal mould.

Description

technical field [0001] The invention relates to rapid manufacturing of metal molds, in particular to a method for rapid manufacturing of metal molds by selective laser sintering (Selective laser sintering, SLS). Background technique: [0002] With the globalization of the market and the intensification of competition, the speed of product replacement is accelerating. The development, research, production cycle of new products, small batches, and fast updates have become one of the main trends in the development of manufacturing technology. Small batches will become an important production mode in the manufacturing industry. In this case, the manufacturing industry puts forward higher requirements for the rapid manufacturing of product prototypes and rapid manufacturing technology of molds, and proposes high-efficiency, high-precision, and high-life three-high molds. The goal of metal mold rapid manufacturing technology is to directly manufacture high-precision durable metal...

Claims

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Application Information

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IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 徐志锋张坚郑玉惠蔡长春胡美忠
Owner NANCHANG AERONAUTICAL ENG INST
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