CN105290391A - Method for manufacturing sampler through powder injection moulding - Google Patents
Method for manufacturing sampler through powder injection moulding Download PDFInfo
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- CN105290391A CN105290391A CN201510830995.9A CN201510830995A CN105290391A CN 105290391 A CN105290391 A CN 105290391A CN 201510830995 A CN201510830995 A CN 201510830995A CN 105290391 A CN105290391 A CN 105290391A
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- sampler
- powder injection
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Abstract
The invention relates to a method for manufacturing a sampler through powder injection moulding. The method for manufacturing the sampler through powder injection moulding sequentially comprises the following steps of granulation, namely metal powder and a binder are blent through a smelting machine so as to become granules with rheological property; injection moulding, namely the granules are injected into a mould cavity with the shape of the sampler to form a workblank; degreasing, namely part of the binder in the workblank is removed, and aviation kerosene is adopted as a degreasing solvent; and sintering, namely the binder is removed to obtain the sampler. The method for manufacturing the sampler through powder injection moulding has the advantages that the degreasing rate is high; the product property is good; and the production cost is low.
Description
Technical field
The present invention relates to a kind of preparation method of sampler of metal powder injection molding.
Background technology
The sampler of traditional 3D shape complexity all adopts stainless steel material to make, production will pass through a series of equipment investment, such as machining center, punch press, milling machine, accurate puncher, Linear cut etc., the equipment needing input a large amount of is artificial, there is the problem of the low waste resource of production cost high yield, especially due to sampler 3D shape complexity, therefore difficulty of processing is high, adopt metallic powder injection moulding process to solve the problem, but adopt metallic powder injection moulding process easily to affect the performance of product due to the problem of degreasing rate.
Summary of the invention
The object of the invention is to provide a kind of degreasing rate high, good product performance, the preparation method of the powder injection-molded sampler that production cost is low.
In order to realize foregoing invention object, present invention employs following technical scheme:
The preparation method of powder injection-molded sampler, step comprises the following steps successively:
(1) granulate, metal dust and binding agent are undertaken blended by banbury, becomes the pellet with rheological characteristic; By pellet mass ratio, metal dust is 93%, and binding agent is 7%; Metal dust is mixed by following component in mass ratio: C0.07%, Cr16.9%, Ni4.5%, Mn0.92%, SI1%, P0.04%, S0.03%, Cu5%, Nb0.2%, Ta0.2%, surplus are Fe; Binding agent is mixed by following component: palm wax, microwax, vinyl acetate, paraffin, stearic acid, polyethylene, polypropylene, polyethylene glycol, polyvinyl butyral resin;
(2) injection moulding, injects the mold cavity with sampler shape by pellet and forms blank;
(3) degreasing, removes the portion of binder in blank; Degreasing solvent is aviation kerosine;
(4) sinter, remove binding agent, obtain sampler; Sintering process curve is as follows: room temperature starts to be heated to 400 DEG C, and insulation, is then heated to 600 DEG C from 400 DEG C, insulation, then is heated to 1150 DEG C from 600 DEG C, and insulation, is then heated to 1360 DEG C, and insulation, Ran Hou Sui stove is chilled to 90 DEG C of-110 DEG C of blow-ons.
As preferably, banburying temperature 180 degree, banburying after 3 hours naturally cooling obtain the mobility of pellet, through screw extruder extrusion granulator.
As preferably, use debinding furnace degreasing, debinding furnace internal solvent temperature is 38 DEG C-45 DEG C.
As preferably, room temperature starts to heat 5 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 5.5 DEG C/min to 600 DEG C of insulation 30min, again from 600 DEG C of heating 7 DEG C/min to 1150 DEG C of insulation 20-30min, be then heated to 1360 DEG C of insulations 2 hours.
As preferably, binding agent is mixed by following component: palm wax 10%, microwax 13%, vinyl acetate 2%, paraffin 48% stearic acid 1%, polyethylene 8%, polypropylene 11.5%, polyethylene glycol 2.5%, polyvinyl butyral resin 4%.
Have employed the preparation method of the powder injection-molded sampler of technique scheme, palm wax, paraffin and microwax are as dispersant, dispersant can improve the interaction between powder and polymer, strengthening powder disperses in the polymer, the object of dispersant is arranged in medium equably by powder particle to remove, to improve powder surface performance, destroy aggregate, in shaping preparation process except raising powder in media as well dispersive property, dispersant can also improve useful load and the shaping green strength of powder, and can not the mobility of deteriorated mixture.Vinyl acetate and polyvinyl butyral resin are as stabilizing agent, and stabilizing agent makes molding structure uniform and stable for a long time.Polypropylene, polyethylene and polyethylene glycol are as plasticizer, and plasticizer increases molded plastic, changes shaping rheological behaviour.Stearic acid is as lubricant, and lubricant reduces various rubbing action.Degreasing solvent adopts aviation kerosine, and the extrusion rate of dispersant and lubricant reaches 99%.Aviation kerosine degreasing is stripped of dispersant and the lubricant of 99%, make between each powder, to have had certain gap so greatly accelerate the speed of sintering thermal debinding in early stage, in the process of insulation 400 DEG C time, dispersant and lubricant are removed totally, in the process of 600 DEG C of insulations, stabilizing agent and plasticizer are removed, remove remained binding agent completely and be warmed up to 1360 DEG C of insulations again in the process of 1150 DEG C of insulations, product is reached or close to stainless steel material density and other performance.Adopt the powder injection-molded sampler that above-mentioned preparation method obtains, its performance parameter is as follows: density:>=7.7g/cm
3; Yield strength:>=975MPa; Hot strength:>=1030MPa; Hardness: HV185.In sum, the advantage of the preparation method of this powder injection-molded sampler is that degreasing rate is high, and good product performance, production cost is low.
Detailed description of the invention
The following specific embodiments of the present invention is to make a detailed explanation.
The preparation method of powder injection-molded sampler, step comprises the following steps successively:
(1) granulate, undertaken blended, banburying temperature 180 degree by metal dust and binding agent by banbury, banburying cools the mobility obtaining pellet naturally after 3 hours, through screw extruder extrusion granulator, become the pellet with rheological characteristic; By pellet mass ratio, metal dust is 93%, and binding agent is 7%; Metal dust is mixed by following component in mass ratio: C0.07%, Cr16.9%, Ni4.5%, Mn0.92%, SI1%, P0.04%, S0.03%, Cu5%, Nb0.2%, Ta0.2%, surplus are Fe; Binding agent is mixed by following component: palm wax 10%, microwax 13%, vinyl acetate 2%, paraffin 48% stearic acid 1%, polyethylene 8%, polypropylene 11.5%, polyethylene glycol 2.5%, polyvinyl butyral resin 4%;
(2) injection moulding, injects the mold cavity with sampler shape by pellet and forms blank; Injection moulding can be produced with common plastic machine, and require that screw rod hardness is large, gun barrel temperature 1 section 145 DEG C, 2 sections 155 DEG C, 3 sections 160 DEG C, nozzle temperature 168 DEG C, mold temperature 45 DEG C-50 DEG C, screw speed 50min, buffering is apart from 10cm
3/ S, locked mode pressure 600bar, pressurize 500bar, dwell time 1s, back pressure 0bar.Avoid injection temperature more than 180 DEG C as far as possible, notice mold temperature can not higher than 55 DEG C simultaneously.During beginning, screw rod first-selection uses low-shearing force, and pressure ratio is 1.6:1, maximum pressure than for 2:1 because pressure crosses conference make blank demoulding difficulty, the problem appearance such as the serious and die wear of burr;
(3) degreasing, removes the portion of binder in blank; Use debinding furnace degreasing, degreasing solvent is aviation kerosine, stove internal solvent temperature 38 DEG C-45 DEG C, solvent flow rate 30ml/h, and the extrusion rate of dispersant and lubricant is 99%;
(4) sinter, remove binding agent, obtain sampler; Room temperature starts to heat 5 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 5.5 DEG C/min to 600 DEG C of insulation 30min, then from 600 DEG C of heating 7 DEG C/min to 1150 DEG C of insulation 20-30min, then be heated to 1360 DEG C of insulations 2 hours, Ran Hou Sui stove is chilled to about 100 DEG C blow-ons.Due to solvent degreasing in early stage be stripped of 99% dispersant and lubricant make between product powder and powder, to have had certain gap thus greatly accelerate sinter early stage thermal debinding speed, at 400 DEG C, in the temperature retention time process of 1 hour, dispersant and lubricant are removed totally.In 600 DEG C of insulations process of 30 minutes, stabilizing agent and plasticizer are removed, 1150 DEG C be incubated within 20 minutes, to remove completely in process in product the adhesive that remains be warmed up to 1360 degree again and be incubated the density that reaches stainless steel material for 2 hours and the performance close to other.
Adopt the powder injection-molded sampler that above-mentioned preparation method obtains, its performance parameter is as follows: sintering post-shrinkage ratio: about 1.17; Density: 7.8g/cm
3; Yield strength: 976MPa; Hot strength: 1032MPa; Hardness: HV185.Traditional forging sampler, its performance parameter is as follows: density:>=7.75g/cm
3; Yield strength:>=1000MPa; Hot strength:>=1105MPa; Hardness HB363.Said method solves the complex-shaped sampler need of production large number quipments of conventional three-dimensional and drops into, and solves difficulty of processing large, and 3D shape is complicated, and precision is low waits series of problems.Advantage is that processing technology is simple, with short production cycle, stable performance, by mould one-shot forming, and degreasing, sintering.Have employed metallic powder injection moulding process, adopt above-mentioned metal powder component and binder component, coordinate above-mentioned technique, namely solve the problem of the performance easily affecting product due to binding agent degreasing rate, also ensure that the performance parameters of sampler is close or exceeded the sampler of traditional stainless steel material.
Claims (5)
1. the preparation method of powder injection-molded sampler, is characterized in that step comprises the following steps successively:
(1) granulate, metal dust and binding agent are undertaken blended by banbury, becomes the pellet with rheological characteristic; By pellet mass ratio, metal dust is 93%, and binding agent is 7%; Metal dust is mixed by following component in mass ratio: C0.07%, Cr16.9%, Ni4.5%, Mn0.92%, SI1%, P0.04%, S0.03%, Cu5%, Nb0.2%, Ta0.2%, surplus are Fe; Binding agent is mixed by following component: binding agent is mixed by following component: palm wax, microwax, vinyl acetate, paraffin, stearic acid, polyethylene, polypropylene, polyethylene glycol, polyvinyl butyral resin;
(2) injection moulding, injects the mold cavity with sampler shape by pellet and forms blank;
(3) degreasing, removes the portion of binder in blank; Degreasing solvent is aviation kerosine;
(4) sinter, remove binding agent, obtain sampler; Sintering process curve is as follows: room temperature starts to be heated to 400 DEG C, and insulation, is then heated to 600 DEG C from 400 DEG C, insulation, then is heated to 1150 DEG C from 600 DEG C, and insulation, is then heated to 1360 DEG C, and insulation, Ran Hou Sui stove is chilled to 90 DEG C of-110 DEG C of blow-ons.
2. the preparation method of powder injection-molded sampler according to claim 1, is characterized in that banburying temperature 180 degree, and banburying cools the mobility obtaining pellet naturally after 3 hours, through screw extruder extrusion granulator.
3. the preparation method of powder injection-molded sampler according to claim 1, it is characterized in that using debinding furnace degreasing, debinding furnace internal solvent temperature is 38 DEG C-45 DEG C.
4. the preparation method of powder injection-molded sampler according to claim 1, it is characterized in that room temperature starts to heat 5 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 5.5 DEG C/min to 600 DEG C of insulation 30min, again from 600 DEG C of heating 7 DEG C/min to 1150 DEG C of insulation 20-30min, be then heated to 1360 DEG C of insulations 2 hours.
5. the preparation method of powder injection-molded sampler according to claim 1, is characterized in that binding agent is mixed by following component: palm wax 10%, microwax 13%, vinyl acetate 2%, paraffin 48%, stearic acid 1%, polyethylene 8%, polypropylene 11.5%, polyethylene glycol 2.5%, polyvinyl butyral resin 4%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105860886A (en) * | 2016-06-14 | 2016-08-17 | 安徽三联学院 | Composite binder for powder injection moulding and preparation and application method |
| CN109702204A (en) * | 2019-03-07 | 2019-05-03 | 湖南英捷高科技有限责任公司 | A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm |
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| CN104860684A (en) * | 2015-05-26 | 2015-08-26 | 北京科技大学 | Adhesive agent for injection molding of aluminum nitride ceramic and application method of adhesive agent |
| CN104907565A (en) * | 2015-04-23 | 2015-09-16 | 上海精科粉末冶金科技有限公司 | Method for processing special-shaped SKD11 part |
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Patent Citations (8)
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| JP2000204402A (en) * | 1999-01-13 | 2000-07-25 | Komatsu Ltd | Aqueous solvent extraction from powder injection-formed body |
| JP2012197475A (en) * | 2011-03-18 | 2012-10-18 | Kanto Yakin Kogyo Co Ltd | Microwave degreasing apparatus and microwave degreasing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105860886A (en) * | 2016-06-14 | 2016-08-17 | 安徽三联学院 | Composite binder for powder injection moulding and preparation and application method |
| CN109702204A (en) * | 2019-03-07 | 2019-05-03 | 湖南英捷高科技有限责任公司 | A kind of outer diameter is less than or equal to the 420 stainless steel biopsy forceps and its MIM preparation process of 1mm |
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Application publication date: 20160203 |