CN105252006A - Method of preparing watch button through powder injection molding - Google Patents

Method of preparing watch button through powder injection molding Download PDF

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Publication number
CN105252006A
CN105252006A CN201510829581.4A CN201510829581A CN105252006A CN 105252006 A CN105252006 A CN 105252006A CN 201510829581 A CN201510829581 A CN 201510829581A CN 105252006 A CN105252006 A CN 105252006A
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CN
China
Prior art keywords
powder injection
binding agent
insulation
molded
heated
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Pending
Application number
CN201510829581.4A
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Chinese (zh)
Inventor
杨东
肖军
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Ningbo Yuxin Metal Powder Technology Co Ltd
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Ningbo Yuxin Metal Powder Technology Co Ltd
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Priority to CN201510829581.4A priority Critical patent/CN105252006A/en
Publication of CN105252006A publication Critical patent/CN105252006A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a method of preparing watch buttons through powder injection molding. The method of preparing the watch buttons through powder injection molding comprises the following steps of: granulating, to be specific, mixing metal powder and a binder by an internal mixer to form granular materials with rheological properties; carrying out injection molding, to be specific, injecting the granular materials into a mold cavity with the shape of a watch button to form a workblank; degreasing, to be specific, clearing away part of binder in the workblank, wherein a greasing solvent is aviation kerosene; and sintering, to be specific, removing the binder to obtain the watch button. The method of preparing the watch buttons through powder injection molding has the advantages of high degreasing rate, good product performance and low production cost.

Description

The preparation method that powder injection-molded table is buckled
Technical field
The preparation method that the table that the present invention relates to a kind of metal powder injection molding is buckled.
Background technology
The table of traditional 3D shape complexity is buckled and is generally adopted 304 stainless steel materials 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 table button 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 that the powder injection-molded table that production cost is low is buckled.
In order to realize foregoing invention object, present invention employs following technical scheme:
The preparation method that powder injection-molded table is buckled, 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 92.3%, and binding agent is 7.7%; Metal dust is mixed by following component in mass ratio: C0.075%, Si0.98%, Mn2%, Cr19.2%, Ni9.3%P0.04%, S0.03%, 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, has pellet injection the mold cavity showing buckle-shaped shape and forms blank;
(3) degreasing, removes the portion of binder in blank; Degreasing solvent is aviation kerosine;
(4) sinter, remove binding agent, obtain table button; 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 1370 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 50 DEG C-60 DEG C.
As preferably, room temperature starts to heat 3 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 3 DEG C/min to 600 DEG C of insulation 30min, again from 600 DEG C of heating 5 DEG C/min to 1150 DEG C of insulation 20-30min, then be heated to 1370 DEG C of insulations 2 hours, Ran Hou Sui stove is chilled to 100 DEG C of blow-ons.
As preferably, binding agent is mixed by following component: palm wax 8.5%, microwax 9%, vinyl acetate 4.5%, stearic acid 3%, polyethylene 12%, polypropylene 5%, polyethylene glycol 7.5%, polyvinyl butyral resin 5.5%, surplus are paraffin.
The preparation method that the powder injection-molded table that have employed technique scheme is buckled, 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 98%.Aviation kerosine degreasing is stripped of dispersant and the lubricant of 98%, 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, in the process of 1150 DEG C of insulations, remove remained binding agent be completely warmed up to 1370 DEG C of insulations again, make product reach stainless steel material 98% to 100% density and other performance.The powder injection-molded table adopting above-mentioned preparation method to obtain is buckled, and its performance parameter is as follows: density:>=7.8g/cm 3; Yield strength:>=197MPa; Hot strength:>=510MPa; Percentage elongation:>=37%; Hardness: HV185.In sum, the advantage of the preparation method that this powder injection-molded table is buckled 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 that powder injection-molded table is buckled, 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 92.3%, and binding agent is 7.7%; Metal dust is mixed by following component in mass ratio: C0.075%, Si0.98%, Mn2%, Cr19.2%, Ni9.3%P0.04%, S0.03%, surplus are Fe; Binding agent is mixed by following component: palm wax 8.5%, microwax 9%, vinyl acetate 4.5%, stearic acid 3%, polyethylene 12%, polypropylene 5%, polyethylene glycol 7.5%, polyvinyl butyral resin 5.5%, surplus are paraffin;
(2) injection moulding, has pellet injection the mold cavity showing buckle-shaped shape 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 155 DEG C, 2 sections 165 DEG C, 3 sections 170 DEG C, nozzle temperature 175 DEG C, mold temperature 45 DEG C-65 DEG C, screw speed 50min, buffering is apart from 10cm 3/ S, locked mode pressure 900bar, pressurize 900bar, dwell time 3s, back pressure 0bar.Avoid injection temperature more than 190 DEG C as far as possible, notice mold temperature can not higher than 68 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 50 C-60 DEG C, solvent flow rate 30ml/h, and the extrusion rate of dispersant and lubricant is 98%;
(4) sinter, remove binding agent, obtain table button; Sintering process curve is: room temperature starts to heat 3 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 3 DEG C/min to 600 DEG C of insulation 30min, again from 600 DEG C of heating 5 DEG C/min to 1150 DEG C of insulation 20-30min, then be heated to 1370 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 98% 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 1370 degree again and be incubated and within 2 hours, reach or close to the density of stainless steel material and other performance.
The powder injection-molded table adopting above-mentioned preparation method to obtain is buckled, and its performance parameter is as follows: sintering post-shrinkage ratio: about 1.18; Density: 7.9g/cm 3; Yield strength: 198MPa; Hot strength: 512MPa; Percentage elongation: 38%; Hardness: HV185.It is as follows that performance parameter buckled by the table of 304 traditional stainless steel materials: density:>=7.93g/cm 3; Yield strength:>=205MPa; Hot strength:>=520MPa; Percentage elongation:>=40%; Hardness: HV≤200.Said method solves the complex-shaped table of conventional three-dimensional and buckles need of production large number quipments input, 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 table button is buckled close to the table of traditional 304 stainless steel materials.

Claims (5)

1. the preparation method that powder injection-molded table is buckled, 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 92.3%, and binding agent is 7.7%; Metal dust is mixed by following component in mass ratio: C0.075%, Si0.98%, Mn2%, Cr19.2%, Ni9.3%P0.04%, S0.03%, 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, has pellet injection the mold cavity showing buckle-shaped shape and forms blank;
(3) degreasing, removes the portion of binder in blank; Degreasing solvent is aviation kerosine;
(4) sinter, remove binding agent, obtain table button; 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 1370 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 that buckles of powder injection-molded table according to claim 1, is characterized in that banburying temperature 180 degree, banburying after 3 hours naturally cooling obtain the mobility of pellet, through screw extruder extrusion granulator.
3. the preparation method that buckles of powder injection-molded table according to claim 1, it is characterized in that using debinding furnace degreasing, debinding furnace internal solvent temperature is 50 DEG C-60 DEG C.
4. the preparation method that buckles of powder injection-molded table according to claim 1, it is characterized in that room temperature starts to heat 3 DEG C/min to 400 DEG C, temperature retention time 1 hour, then from 400 DEG C of heating 3 DEG C/min to 600 DEG C of insulation 30min, again from 600 DEG C of heating 5 DEG C/min to 1150 DEG C of insulation 20-30min, then be heated to 1370 DEG C of insulations 2 hours, Ran Hou Sui stove is chilled to 100 DEG C of blow-ons.
5. the preparation method that buckles of powder injection-molded table according to claim 1, is characterized in that binding agent is mixed by following component: palm wax 8.5%, microwax 9%, vinyl acetate 4.5%, stearic acid 3%, polyethylene 12%, polypropylene 5%, polyethylene glycol 7.5%, polyvinyl butyral resin 5.5%, surplus are paraffin.
CN201510829581.4A 2015-11-25 2015-11-25 Method of preparing watch button through powder injection molding Pending CN105252006A (en)

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CN105252006A true CN105252006A (en) 2016-01-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63290205A (en) * 1987-05-22 1988-11-28 Kobe Steel Ltd Production of metallic mold made of metal powder compact
CN103846445A (en) * 2012-12-03 2014-06-11 长沙聚众冶金科技有限公司 Production method of high-length-diameter-ratio high-precision thin walled parts
CN104668565A (en) * 2015-01-04 2015-06-03 东莞劲胜精密组件股份有限公司 Powder injection molding feedstock preparing method and powder injection molding method
CN104785785A (en) * 2015-04-01 2015-07-22 宝得粉末注射成形(常熟)有限公司 Machining method for swing cam for car steering control system
CN104972129A (en) * 2015-04-09 2015-10-14 玉溪大红山矿业有限公司 Method for manufacturing iron-based alloy part

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63290205A (en) * 1987-05-22 1988-11-28 Kobe Steel Ltd Production of metallic mold made of metal powder compact
CN103846445A (en) * 2012-12-03 2014-06-11 长沙聚众冶金科技有限公司 Production method of high-length-diameter-ratio high-precision thin walled parts
CN104668565A (en) * 2015-01-04 2015-06-03 东莞劲胜精密组件股份有限公司 Powder injection molding feedstock preparing method and powder injection molding method
CN104785785A (en) * 2015-04-01 2015-07-22 宝得粉末注射成形(常熟)有限公司 Machining method for swing cam for car steering control system
CN104972129A (en) * 2015-04-09 2015-10-14 玉溪大红山矿业有限公司 Method for manufacturing iron-based alloy part

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Application publication date: 20160120