CN104889391A - Ag-MeC electric contact and integrated assembly manufacturing method - Google Patents
Ag-MeC electric contact and integrated assembly manufacturing method Download PDFInfo
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- CN104889391A CN104889391A CN201510170631.2A CN201510170631A CN104889391A CN 104889391 A CN104889391 A CN 104889391A CN 201510170631 A CN201510170631 A CN 201510170631A CN 104889391 A CN104889391 A CN 104889391A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an Ag-MeC electric contact and an integrated assembly manufacturing method. First, overlaying film silver-carbide composite powder is prepared and added to a 3D printer powder cylinder; then 3D models of a silver-carbide electric contact and an integrated assembly of the same are built via a computer; and at last 3D printing is finished for the silver-carbide electric contact and the integrated assembly of the same. Quick and direct formation of the silver-carbide electric contact and the integrated assembly of the same from raw material to completed products can be achieved via 3D printing, so raw material and production cost can be reduced; storage and delivery time can be avoided; and a new method is provided for preparation of Ag-MeC electric contact and integrated assembly.
Description
Technical field
The present invention relates to the forming method of a kind of electrical contact and integral component thereof, specifically, what relate to is the 3D printing shaping method of a kind of Ag-MeC electrical contact and integral component thereof.
Background technology
Electrical contact and integral component thereof are the industrial base components such as motor, electrical equipment, instrument and meter, electronics, it is also core parts simultaneously, the feature of electrical contact and integral component thereof is: volume is little, complex-shaped, and require wide in variety, specification is complete, performance is high, its quality directly affects the performance of low-voltage electrical apparatus.Manufacturing high-quality electrical contact and integral component thereof can economize energy and raw material greatly.So the kind of electrical contact and integral component thereof, quality, technology level have become one of mark of the industrial products such as motor, electrical equipment performance level.But prepare the Processes and apparatus of high-quality, various in style, complex-shaped various electrical contact and the many cover complexity of integral component needs thereof, floor space is large, causes high production cost.Simultaneously integral component affects electric property and the mechanical property of integral component due to the series of problems of electrical contact and tactile bridge combination interface, and then affects the reliability of low-voltage electrical apparatus.For reducing costs, improving integral component combination interface quality, constantly having new electrical contact and integral component preparation technology thereof to be developed.
Research both at home and abroad in electrical contact and integral component preparation technology thereof is specific as follows:
2) Chinese invention patent: cold pressure welding compound rivet contacts and manufacture method, application number: 200910053737.9, publication number: CN101587788A.
2) Chinese invention patent: the manufacture method of triple-layer composite cold-rolling welded rivet contact, application number: 200710036330.6, publication number: CN101030491A.
3) Chinese invention patent: igniter and the manufacture method thereof with the firing tip of induction welding and laser weld, application number: 200880114019.1, publication number: CN101842948A.
The technology of preparing of various electrical contact and integral component thereof has saved noble metal raw material all to a certain extent above, simplify preparation technology's flow process of electrical contact, reduce cost of material and production cost, also improve the combination interface quality of electrical contact and tactile bridge in integral component simultaneously, but it still can not reach the production directly from raw material to finished product, still needs multi-step process just can complete.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, preparation method---the 3D printing shaping method of a kind of brand-new Ag-MeC electrical contact and integral component thereof is provided, Selective Laser Sintering in utilizing 3D to print realizes Ag-MeC electrical contact and the quick straight forming of integral component from raw material to finished product thereof, reduce production cost, and improve the combination interface quality touching bridge and Ag-MeC electrical contact in integral component further, improve its electric property and mechanical property; Realize the zero inventory of Ag-MeC electrical contact and integral component thereof, zero-time payment, and then reduce inventory cost.
For realizing above-mentioned object, the 3D printing shaping method of Ag-MeC electrical contact of the present invention and integral component thereof, comprises the steps:
The first step, the component requirements according to Ag-MeC electrical contact carries out powder process, and adopts chemical silvering to carbide powder or compound electric is silver-plated carries out pretreatment, then requires batching according to Ag-MeC electrical contact composition proportion, mixed powder makes silver-carbide composite powder;
Second step, is that overlay film silver-carbide composite powder made by binding agent with high molecular polymer by silver-carbide composite powder, is encased in by overlay film silver-carbide composite powder in 3D printer powder cylinder;
3rd step, sets up the threedimensional model of Ag-MeC electrical contact and integral component thereof, utilizes Selective Laser Sintering to carry out the 3D printing shaping of Ag-MeC electrical contact and integral component thereof, obtains moulded blank.
As a preferred embodiment, in the described first step: silver powder is the mixing of nano powder and powder and micron, silver-carbide quality proportioning is 60:40 ~ 35:65.In this step, silver powder adopts the mixing of nano powder and powder and micron, because the fusing point of nano-silver powder is low, micro-silver powder fusing point is high, the mixed powder of both employings, the nano-silver powder first melted is filled in unfused micro-silver powder, can solve 3D and print Ag-MeC electrical contact and integral component voidage is high, interface quality is poor problem thereof.
As a preferred embodiment, in described second step: the particle diameter of overlay film silver-carbide composite powder is 1 ~ 50 μm.Polymeric binder diluent is diluted, after stirring, silver-carbide composite powder is put into wherein, ceaselessly stir, polymer is allowed fully to be wrapped up by silver-carbide composite powder, drying makes adhesive cures again, obtains overlay film silver-carbide composite powder, and this composite powder concrete structure coalesces together again after silver-carbide composite particles Surface coating one layer of polymeric binding agent.
As a preferred embodiment, in described 3rd step: selective laser sintering and moulding is a kind of heat treatment process, there is a series of physical and chemical changes in the process, mainly contain the change of the generation of heat and conduction, the differentiation of microstructure, the impact of fluid and mechanical tissue, powder to be powdered agglomerate by granular aggregation, thus Ag-MeC electrical contact needed for being formed and integral component thereof.In this series of problem, the impact of heat problem is topmost.In laser sintering metallic powder, heat is produced by the energy of laser and powder preheating completely, and various technological parameter decides the energy density of laser jointly, most important technological parameter comprises laser power, sweep speed, sweep span and lift height etc.The present invention first affects above each technological parameter and the matching relationship thereof of quantity of sintered parts by the numerical simulation analysis in metal powder sintered temperature field, and finally determine laser power 13 ~ 15W by experiment further, sweep speed 1800 ~ 2000mm/s, sweep span 0.1 ~ 0.16mm, lift height 0.1 ~ 0.14mm.
As a preferred embodiment, the present invention, after the 3rd step, performs the 4th step: carry out post processing to obtain closely knit Ag-MeC electrical contact and integral component thereof to moulded blank.
Preferably; in described 4th step: powder unnecessary in moulded blank is removed; after further cleaning polishing; also need to be for further processing to moulded blank; now moulded blank experienced three stages: degradation polymer, double sintering and metallic cementation, this three phases can carry out in same heating furnace, and protective atmosphere is the hydrogen of 30%; the nitrogen of 70%, percentage composition here refers to volumn concentration.
The present invention adopts 3D printing technique to manufacture Ag-MeC electrical contact and integral component thereof, adopts powder surface to be coated with organic polymer on the one hand and solves the printing difficult problem that Ag material causes because thermal conductivity is high and laser reflectivity is high; The method on the other hand adopting Ag nano powder to mix with powder and micron solves 3D and prints Ag-MeC electrical contact and integral component voidage is high, interface quality is poor problem thereof.
Compared with prior art, the present invention has following beneficial effect: the particular advantages utilizing 3D printing technique, can the complex-shaped Ag-MeC electrical contact of manufacturing structure and integral component thereof and do not increase cost; Multiple Ag-MeC electrical contact and assembly thereof can be manufactured and do not increase production line; Because 3D printing increases material manufacture, the waste of raw material can not be caused; Due to without the need to production line and 3D printer volume is little, floor space is little, can reduce production cost; Zero inventory, zero-time payment can be realized.Simultaneously can manufacture complete integral component and improve the electric conductivity of integrated element.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram.
Detailed description of the invention
Elaborate to embodiments of the invention below, following examples give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the device that the present invention adopts and principle signal thereof, in figure: 1. laser instrument, 2. laser beam scanner, 3. laser beam, 4.ZnSe window, 5.AgMeC electrical contact and integral component thereof, 6. moulding cylinder, 7. working piston, 8. powder cylinder, 9. powder feeding piston, 10. powder-laying roller.Its operation principle: whole process unit forms primarily of moulding cylinder 6 and powder cylinder 8, when work starts, powder feeding piston 9 rises, by powder-laying roller 10 by uniform spreading last layer on the tactile bridge of overlay film silver-carbide composite powder on working piston 7, computer controls the two-dimensional scan track of laser beam 3 according to the hierarchical model of prototype, and sintering solid dusty material is to form an aspect of Ag-MeC electrical contact and integral component 5Ag-MeC electrical contact thereof selectively.After powder completes one deck, working piston 7 declines a thickness, and powder-laying roller 10 spreads new powder, controls laser beam 3 and scan and sinter new layer.So move in circles, be layering, until Ag-MeC electrical contact and integral component 5 shaping.Finally, to unsintered Powder Recovery in powder cylinder, and moulded blank is taken out.
Embodiment 1
To print Ag60WC40 electrical contact and integral component thereof
The first step, prepares silver, tungsten carbide powder respectively, adopts chemical silvering to carry out pretreatment to tungsten carbide powder, and is that 60:40 carries out mixed powder and makes silver-tungsten carbide composite powder by silver-tungsten carbide quality proportioning.
Second step, be that overlay film silver-tungsten carbide composite powder that particle diameter is 1 μm made by binding agent (polymer adopted here mainly thermoplastic, as Merlon (PC), nylon (PA) etc.) with high molecular polymer by silver-tungsten carbide composite powder.Overlay film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, set up the threedimensional model of Ag60WC40 electrical contact and integral component thereof, Selective Laser Sintering is utilized to carry out the 3D printing shaping of Ag60WC40 electrical contact and integral component thereof, laser power is 13W, sweep speed is 1800mm/s, sweep span is 0.1mm, and lift height is 0.1mm, obtains Ag60WC40 electrical contact and integral component thereof.
Embodiment 2
To print Ag50WC50 electrical contact and integral component thereof
The first step, prepares silver, tungsten carbide powder respectively, adopts chemical silvering to carry out pretreatment to tungsten carbide powder, and is that 50:50 carries out mixed powder and makes silver-tungsten carbide composite powder by silver-tungsten carbide quality proportioning.
Silver-tungsten carbide composite powder is overlay film silver-tungsten carbide composite powder that binding agent makes that particle diameter is 10 μm with high molecular polymer by second step.Overlay film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, set up the threedimensional model of Ag50WC50 electrical contact and integral component thereof, Selective Laser Sintering is utilized to carry out the 3D printing shaping of Ag50WC50 electrical contact and integral component thereof, laser power is 14W, sweep speed is 1900mm/s, sweep span is 0.13mm, and lift height is 0.12mm.
4th step, carries out clearing up polishing and the post processing such as secondary heat treatment to obtain high strength, high accuracy and contact-the touch bridge combination interface quality well Ag50WC50 electrical contact of (ratio of brazing area reaches more than 99%) and integral component thereof to moulded blank.
Embodiment 3
To print Ag35WC65 electrical contact and integral component thereof
The first step, prepares silver, tungsten carbide powder respectively, tungsten carbide powder is adopted to compound electric is silver-plated carries out pretreatment, and is that 35:65 carries out mixed powder and makes silver-tungsten carbide composite powder by silver-tungsten carbide quality proportioning.
Silver-tungsten carbide composite powder is overlay film silver-tungsten carbide composite powder that binding agent makes that particle diameter is 50 μm with high molecular polymer by second step.Overlay film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, set up the threedimensional model of Ag35WC65 electrical contact and integral component thereof, Selective Laser Sintering is utilized to carry out the 3D printing shaping of Ag35WC65 electrical contact and integral component thereof, laser power is 15W, sweep speed is 2000mm/s, sweep span is 0.16mm, and lift height is 0.14mm.
4th step, carries out clearing up polishing and the post processing such as secondary heat treatment to obtain high strength, high accuracy and contact-the touch bridge interface quality well Ag35WC65 electrical contact of (ratio of brazing area reaches more than 99%) and integral component thereof to moulded blank.
Although content of the present invention has done detailed introduction by above-described embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. a manufacture method for Ag-MeC electrical contact and integral component thereof, is characterized in that, comprises the following steps:
The first step, the component requirements according to Ag-MeC electrical contact carries out powder process, and adopts chemical silvering to carbide powder or compound electric is silver-plated carries out pretreatment, then requires batching according to Ag-MeC electrical contact composition proportion, mixed powder makes silver-carbide composite powder;
Second step, is that overlay film silver-carbide composite powder made by binding agent with high molecular polymer by silver-carbide composite powder, is encased in by overlay film silver-carbide composite powder in 3D printer powder cylinder;
3rd step, sets up the threedimensional model of Ag-MeC electrical contact and integral component thereof, utilizes Selective Laser Sintering to carry out the 3D printing shaping of Ag-MeC electrical contact and integral component thereof, obtains moulded blank.
2. the manufacture method of Ag-MeC electrical contact according to claim 1 and integral component thereof, is characterized in that: in the described first step: in silver-carbide, silver, carbonaceous amount proportioning are 60/40 ~ 35/65.
3. the manufacture method of Ag-MeC electrical contact according to claim 2 and integral component thereof, is characterized in that: in the described first step: silver powder is the mixing of nano powder and powder and micron.
4. the forming method of Ag-MeC electrical contact according to claim 1 and integral component thereof, is characterized in that: in described second step: the particle diameter of overlay film silver-carbide composite powder is 1 ~ 50 μm.
5. the forming method of Ag-MeC electrical contact according to claim 4 and integral component thereof, it is characterized in that: in described second step: polymeric binder diluent is diluted, after stirring, silver-carbide composite powder is put into wherein, ceaselessly stir, polymer is allowed fully to be wrapped up by silver-carbide composite powder, drying makes adhesive cures again, obtain overlay film silver-carbide composite powder, this composite powder structure coalesces together again after silver-carbide composite particles Surface coating one layer of polymeric binding agent.
6. the manufacture method of Ag-MeC electrical contact according to claim 1 and integral component thereof, it is characterized in that: in described 3rd step: the above each technological parameter and the matching relationship thereof that are affected quantity of sintered parts by the numerical simulation analysis in metal powder sintered temperature field, Selective Laser Sintering parameter is: laser power 13 ~ 15W, sweep speed 1800 ~ 2000mm/s, sweep span 0.1 ~ 0.16mm, lift height 0.1 ~ 0.14mm.
7. the Ag-MeC electrical contact according to any one of claim 1-6 and the manufacture method of integral component thereof, it is characterized in that: after the 3rd step, perform the 4th step: post processing is carried out to obtain closely knit Ag-MeC electrical contact and integral component thereof to moulded blank.
8. the manufacture method of Ag-MeC electrical contact according to claim 7 and integral component thereof, it is characterized in that: described post processing, refer to: powder unnecessary in moulded blank is removed, after further cleaning polishing, moulded blank is for further processing, now moulded blank experienced three stages: degradation polymer, double sintering and metallic cementation.
9. the manufacture method of Ag-MeC electrical contact according to claim 8 and integral component thereof; it is characterized in that: described degradation polymer, double sintering and metallic cementation three phases carry out in same heating furnace; protective atmosphere is the hydrogen of 30%, the nitrogen of 70%.
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| CN201510170631.2A CN104889391B (en) | 2015-04-10 | 2015-04-10 | A kind of manufacture method of Ag MeC electrical contacts and its integral component |
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| CN201510170631.2A CN104889391B (en) | 2015-04-10 | 2015-04-10 | A kind of manufacture method of Ag MeC electrical contacts and its integral component |
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| CN109797307A (en) * | 2019-01-09 | 2019-05-24 | 东南大学 | A kind of Ag/C@Ti3AlC2The preparation method of contact material |
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| CN104889391B (en) | 2017-10-27 |
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