CN102554234A - Processing method and supporting jig for metal injection molding structural parts - Google Patents

Processing method and supporting jig for metal injection molding structural parts Download PDF

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Publication number
CN102554234A
CN102554234A CN2012100475923A CN201210047592A CN102554234A CN 102554234 A CN102554234 A CN 102554234A CN 2012100475923 A CN2012100475923 A CN 2012100475923A CN 201210047592 A CN201210047592 A CN 201210047592A CN 102554234 A CN102554234 A CN 102554234A
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China
Prior art keywords
structural
support jig
processing
support
degreasing
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Pending
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CN2012100475923A
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Chinese (zh)
Inventor
何波
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Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Priority to CN2012100475923A priority Critical patent/CN102554234A/en
Publication of CN102554234A publication Critical patent/CN102554234A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a processing method and a supporting jig for metal injection molding structural parts. The method comprises the following steps: A, mixing metal powder and adhesives to form a mixed material; B, placing the mixed material into an injection machine for injection molding to obtain molding blanks; C, placing the molding blanks into a degreasing furnace for degreasing to obtain degreased blanks; and D, supporting the degreased blanks by the supporting jig in a fitting way, and placing the degreased blanks and the supporting jig into a sintering furnace for sintering together for 30-40h under the temperature being 1200-1400 DEG C, wherein in the step D, the supporting jig is made of a material same as the material of the structural part. As the supporting jig made of the material same as the material of the structural part is adopted for fitting supporting and then is sintered together during sintering, the transformation amount of the structural part can be greatly reduced, the structural part has the same contractibility rate as the supporting jig, and the structural part and the supporting jig are easy to separate after sintering.

Description

A kind of processing method of metal injection molded molding structure spare and support jig thereof
Technical field
The metal injection molded forming field in the field that the present invention relates to, what relate in particular is a kind of process modifications of metal injection molded molding structure spare.
Background technology
Metal injection molded moulding (Metal Injection Molding is called for short MIM) is that a kind of plasticising compound with metal dust and its binding agent is injected in the manufacturing process in the model.It is earlier selected powder to be mixed with binding agent, then with the compound needed shape of injection moulding of granulating again.Polymer is given compound with the characteristic of its VISCOUS FLOW, and help to be shaped, die cavity is filled and the uniformity of powder packing.Get rid of binding agent after being shaped, again the degreasing blank is carried out sintering.Sintered products not only has complicated shape and the high accuracy the same with injection molding of plastics method resulting product, and has the physics approaching with forging, chemistry and mechanical performance.The manufacturing that the suitable production in enormous quantities of this technology is small-sized, accurate, 3D shape is complicated and have the metallic element of property requirement.
Sintering processing of the prior art is after metal injection molded moulding is accomplished, and according to the shape of part part is ordered on the graphite sintering gripper shoe of plane, puts into sintering furnace again and carries out sintering.Adopt this sintering processing mainly to have following shortcoming: complicated parts inside can not get effective support, owing to the influence of stress, gravity etc., causes part deformation easily in the sintering process, follow-up being difficult to orthopedic; Between 15-20%, if gripper shoe is provided with the internal structure of support structure part, part sintering completion after-contraction fastens gripper shoe and causes part and support member to be difficult to separate part, thereby causes part to be difficult to take out at the sintering post-shrinkage ratio.
Therefore, prior art still haves much room for improvement and develops.
Summary of the invention
The objective of the invention is to, a kind of processing method and support jig thereof of metal injection molded molding structure spare is provided, be difficult to the problem of taking out with part deformation and part in the solution sintering process from support member.
Technical scheme of the present invention is following:
A kind of processing method of metal injection molded molding structure spare wherein, may further comprise the steps: A, metal dust mixed with bonding agent form batch mixing; B, said batch mixing is inserted in the injection machine, injection mo(u)lding obtains moulded blank; C, said moulded blank is inserted debinding furnace carry out degreasing, obtain the degreasing blank; D, said degreasing blank fit is supported by a support jig, more said degreasing blank and said support jig are put into the sintering furnace co-sintered, sintering time is 30-40h, 1200 ℃-1400 ℃ of temperature; In the wherein said D step, said support jig adopts with said structural member identical materials and is made.
Described processing method, wherein, further comprising the steps of after the said D step: E, said sintered part is carried out back processing, the processing of said back comprises processing cast gate, orthopedic.
Described processing method, wherein, said A step also comprises: A1, said batch mixing is machined to form granule through granulation.
Described processing method, wherein, said support jig adopts batch mixing, injection mo(u)lding, degreasing process is made.
Described processing method, wherein, said support jig bottom is set to planar structure, and the supporting surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully.
A kind of support jig that is used for metal injection molded molding structure spare processing method, wherein, said support jig adopts with said structural member identical materials and is made.
Described support jig, wherein, said support jig adopts batch mixing, injection mo(u)lding, degreasing process is made.
Described support jig, wherein, said support jig bottom is set to planar structure, and the support outer surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully.
The processing method of a kind of metal injection molded molding structure spare provided by the present invention and support jig thereof; Owing in sintering process, adopt with the support jig applying of said structural member same material and support the back co-sintered; The inside of said structural member has obtained effective support, has reduced the deflection of said structural member greatly; Because said structural member and said support jig adopt same material to make, and said structural member is identical with the shrinkage factor of support jig, said structural member was easy to separate with said support jig after sintering was accomplished simultaneously.
Description of drawings
Fig. 1 is the process chart of a kind of metal injection molded molding structure spare processing method of the present invention.
Fig. 2 is the structural representation of the present invention's structural member to be processed.
The structural representation of the support jig when Fig. 3 is a sintering of the present invention.
Fig. 4 is the assembly structure sketch map of the present invention's structural member to be processed and support jig.
The specific embodiment
Below will combine accompanying drawing, specific embodiments of the invention and embodiment specify, and described specific embodiment in order to explain the present invention, is not to be used to limit the specific embodiment of the present invention only.
The invention discloses a kind of processing method of metal injection molded molding structure spare, its processing process is as shown in Figure 1, may further comprise the steps:
Step S110, metal dust mixed with bonding agent form batch mixing; The ratio of said metal dust and said bonding agent is about 3: 2, and said metal dust mainly is a stainless steel, and its material model commonly used is SUS316L, SUS17-4H or SUS440C etc.
Step S120, said batch mixing is inserted in the injection machine, injection mo(u)lding obtains moulded blank; After said batch mixing inserted injection machine, with said batch mixing fusion, the hydraulic stem that utilizes injection machine again was injected into the batch mixing of fusion in the die cavity, and last die cavity die sinking is taken out product and obtained moulded blank.
Step S130, said moulded blank is inserted debinding furnace carry out degreasing, obtain the degreasing blank; Degreasing time is 20 hours-30 hours, and temperature is 200 ℃-500 ℃, divides 3 to 4 grades and improves temperature step by step; From moulded blank, deviate from the bonding agent of 30%-50%, under hot conditions, bonding agent partly volatilizees; Make moulded blank form the partial through holes shape, obtain the degreasing blank.
Step S140, said degreasing blank fit is supported by a support jig, more said degreasing blank and said support jig are put into the sintering furnace co-sintered, sintering time is 30-40h, 1200 ℃-1400 ℃ of temperature; Wherein, said support jig adopts with said structural member identical materials and is made.。In sintering process, the partial through holes shape of degreasing blank can be densified, the co-contraction of said degreasing blank and said support jig meeting simultaneously, and shrinkage factor is 15%-20%.
Because in sintering process, be used in the support jig applying assembling back co-sintered of said structural member same material, the inside of said structural member has obtained effective support, has reduced the deflection of said structural member greatly; Because said structural member and said support jig adopt same material to make, and said structural member is identical with the shrinkage factor of support jig, said structural member was easy to separate with said support jig after sintering was accomplished simultaneously.
After sintering is accomplished, also comprise step S150 as required, step S150, sintered part is carried out back process.If do not need the back to process, said sintered part is final structural member; Cast gate is for example processed in back processing if desired, and is orthopedic etc., after machine after, can obtain final structural member.
Wherein, step S110 also comprises: S111, said batch mixing is machined to form granule through granulation.Said batch mixing is cut into the big or small fine granularity of the grain of rice through system material machine, obtains the material grain, be convenient to the fusing of batch mixing in the injection mo(u)lding, the speed that can accelerate to melt.
Said support jig adopts batch mixing, injection mo(u)lding, and degreasing process is made; Adopt with the preceding identical technology of degreasing blank of sintering to be made, again with said support jig and degreasing blank co-sintered, owing to adopt same material; And be to be made by same process; Therefore, both shrinkage factors in sintering process are identical, and said structural member was easy to separate with said support jig after sintering was accomplished; Said support jig adopts the technology identical with the degreasing blank, can also save the needed process time of the said support jig of Design and Machining.
Said support jig bottom is set to planar structure; Can conveniently said support jig be placed said sintering furnace stably; The supporting surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully; Said like this structural member just can obtain the support fully of said support jig, has reached comprehensive support purpose.
The invention also discloses a kind of support jig that is used for metal injection molded molding structure spare processing method, said structural member is the metallic element of mobile phone, and said support jig adopts with said structural member identical materials and is made.Said structural member is identical with the shrinkage factor of support jig, and said structural member was easy to separate with said support jig after sintering was accomplished.Concrete, said support jig adopts the technology injection mo(u)lding identical with said structural member.Can save the needed process time of the said support jig of Design and Machining.Concrete; Said support jig bottom is set to planar structure; Can conveniently said support jig be placed said sintering furnace stably; The supporting surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully, and said like this structural member just can obtain the support fully of said support jig, has reached comprehensive support purpose.
Combine Fig. 3, shown in Figure 4 like Fig. 2, Fig. 2 is the structural representation of structural member 100 to be processed, and the structural representation of the support jig 200 when Fig. 3 is sintering, Fig. 4 are the structural member 100 to be processed and the assembly structure sketch map of support jig 200.The raw-material material of said structural member 100 is SUS316L, and processing method is following:
At first the SUS316L powder is mixed with bonding agent and form batch mixing; The ratio of said SUS316L powder and said bonding agent is about 3: 2.
Then said batch mixing is machined to form granule through granulation.Said batch mixing is cut into the big or small fine granularity of the grain of rice through system material machine, obtains the material grain, be convenient to the fusing of batch mixing in the injection mo(u)lding, the speed that can accelerate to melt.
Said material grain is inserted in the injection machine, injection mo(u)lding obtains moulded blank again; After said batch mixing inserted injection machine, with said batch mixing fusion, the hydraulic stem that utilizes injection machine again was injected into the batch mixing of fusion in the die cavity, and last die cavity die sinking is taken out product and obtained moulded blank.
Again said moulded blank is inserted debinding furnace and carry out degreasing, obtain the degreasing blank; Degreasing time is 20 hours to 30 hours, and temperature is 200 ℃-500 ℃, divides 3 to 4 grades and improves temperature step by step; From moulded blank, deviate from the bonding agent of 30%-50%, under hot conditions, bonding agent partly volatilizees; Make moulded blank form the partial through holes shape, obtain the degreasing blank.
Again said degreasing blank is fitted by a support jig and support, as shown in Figure 4, more said degreasing blank and said support jig are put into the sintering furnace co-sintered, sintering time is 30-40h, 1200 ℃-1400 ℃ of temperature; In the wherein said D step, said support jig adopts with said structural member identical materials and is made.In sintering process, the partial through holes shape of degreasing blank can be densified.Said degreasing blank and said support fixture can co-contraction simultaneously.Because said structural member 100 is an identical materials with said support jig 200 employings, so both shrinkage factors are identical, sintering is easy to said structural member 100 is separated with said support jig 200 after accomplishing, and can not cause the distortion of said structural member 100.Simultaneously, because said structural member 100 is the assembling of fitting with said support jig 200, the inside of said structural member 100 has obtained effective support, has reduced the deflection of said structural member 100 in sintering process greatly.And said support jig bottom is set to planar structure, can conveniently said support jig be placed said sintering furnace stably; The supporting surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully, and said like this structural member just can obtain the support fully of said support jig, has reached comprehensive support purpose; Reduced the distortion of said structural member 100 in sintering process greatly, said support jig adopts batch mixing, injection mo(u)lding; Degreasing process is made, and adopts with the preceding identical technology of degreasing blank of sintering to be made, again with said support jig and degreasing blank co-sintered; Owing to adopt same material, and be to be made, therefore by same process; Both shrinkage factors in sintering process are identical; Said structural member was easy to separate with said support jig after sintering was accomplished, and said support jig adopts the technology identical with the degreasing blank, can also save the needed process time of the said support jig of Design and Machining.
At last sintered part is carried out back processing and obtain said structural member 100.Adopt the support jig 200 of identical material to fit to adorn in the sintering link and support, reduced the distortion of said structural member 100 greatly, said structural member 100 is easy to separate with said support jig 200 simultaneously.Therefore promoted the qualification rate of producing said structural member 100.
Compare with of the prior art; The processing method of a kind of metal injection molded molding structure spare provided by the present invention and support jig thereof; Owing in sintering process, adopt support jig applying assembling back co-sintered with said structural member same material; The inside of said structural member has obtained effective support, has reduced the deflection of said structural member greatly; Because said structural member and said support jig adopt same material to make, and said structural member is identical with the shrinkage factor of support jig, said structural member was easy to separate with said support jig after sintering was accomplished simultaneously.
Should be understood that; The above is merely preferred embodiment of the present invention, is not sufficient to limit technical scheme of the present invention, concerning those of ordinary skills; Within spirit of the present invention and principle; Can increase and decrease according to above-mentioned explanation, replacement, conversion or improvement, and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection domain of accompanying claims of the present invention.

Claims (8)

1. the processing method of a metal injection molded molding structure spare is characterized in that, may further comprise the steps: A, metal dust mixed with bonding agent form batch mixing;
B, said batch mixing is inserted in the injection machine, injection mo(u)lding obtains moulded blank;
C, said moulded blank is inserted debinding furnace carry out degreasing, obtain the degreasing blank;
D, said degreasing blank fit is supported by a support jig, more said degreasing blank and said support jig are put into the sintering furnace co-sintered, sintering time is 30-40h, 1200 ℃-1400 ℃ of temperature;
In the wherein said D step, said support jig adopts with said structural member identical materials and is made.
2. processing method according to claim 1 is characterized in that, and is further comprising the steps of after the said D step:
E, said sintered part is carried out back processing, the processing of said back comprises processing cast gate, orthopedic.
3. processing method according to claim 1 is characterized in that, said A step also comprises: A1, said batch mixing is machined to form granule through granulation.
4. processing method according to claim 1 is characterized in that, said support jig adopts batch mixing, injection mo(u)lding, and degreasing process is made.
5. processing method according to claim 1 is characterized in that, said support jig bottom is set to planar structure, and the supporting surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully.
6. one kind is used for the support jig of processing method according to claim 1, it is characterized in that, said support jig adopts with said structural member identical materials and is made.
7. support jig according to claim 6 is characterized in that, said support jig adopts batch mixing, injection mo(u)lding, and degreasing process is made.
8. support jig according to claim 6 is characterized in that, said support jig bottom is set to planar structure, and the support outer surface and the said structural member inner surface that are used to support said structural member on the said support jig are fitted fully.
CN2012100475923A 2012-02-28 2012-02-28 Processing method and supporting jig for metal injection molding structural parts Pending CN102554234A (en)

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Cited By (11)

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CN104043835A (en) * 2014-06-03 2014-09-17 宝得粉末注射成形(常熟)有限公司 Processing method for presser foot control cam for computerized flat knitting machines
CN105108154A (en) * 2015-09-21 2015-12-02 深圳艾利门特科技有限公司 Method for preparing special-shaped complex part through powder injection molding technology
CN105458268A (en) * 2015-12-04 2016-04-06 东莞华晶粉末冶金有限公司 Sintering tool for powder injection molding products and manufacturing method of sintering tool
CN106001557A (en) * 2016-07-28 2016-10-12 昆山安泰美科金属材料有限公司 Metal powder injection forming sintering device
CN106078111A (en) * 2016-07-14 2016-11-09 昆山科森科技股份有限公司 A kind of processing method of charging inlet support
DE102015210770A1 (en) * 2015-06-12 2016-12-15 Rolls-Royce Deutschland Ltd & Co Kg Component construction, component for a gas turbine and method for producing a component of a gas turbine by metal powder injection molding
CN106735170A (en) * 2016-12-20 2017-05-31 佛山铂利镁特金属科技有限公司 A kind of injection moulding method of big part metalwork
CN107257719A (en) * 2015-01-14 2017-10-17 数字金属公司 Sintering method, manufacture method, object data processing method, data medium and object data processor
CN108607989A (en) * 2018-04-11 2018-10-02 深圳艾利佳材料科技有限公司 The ejection forming method of abnormal complex part
CN111745960A (en) * 2016-01-29 2020-10-09 精工爱普生株式会社 Method for manufacturing three-dimensional shaped object
CN111872399A (en) * 2020-08-22 2020-11-03 江苏精研科技股份有限公司 Synchronous sintering method of titanium alloy or pure titanium product in powder injection molding

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CN104043835A (en) * 2014-06-03 2014-09-17 宝得粉末注射成形(常熟)有限公司 Processing method for presser foot control cam for computerized flat knitting machines
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CN106735170A (en) * 2016-12-20 2017-05-31 佛山铂利镁特金属科技有限公司 A kind of injection moulding method of big part metalwork
CN106735170B (en) * 2016-12-20 2019-01-25 佛山铂利镁特金属科技有限公司 A kind of injection moulding method of big part metalwork
CN108607989A (en) * 2018-04-11 2018-10-02 深圳艾利佳材料科技有限公司 The ejection forming method of abnormal complex part
CN111872399A (en) * 2020-08-22 2020-11-03 江苏精研科技股份有限公司 Synchronous sintering method of titanium alloy or pure titanium product in powder injection molding

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