CN108421981A - POM plastics are used as can the injection molding application of fusible core - Google Patents
POM plastics are used as can the injection molding application of fusible core Download PDFInfo
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- CN108421981A CN108421981A CN201710747406.XA CN201710747406A CN108421981A CN 108421981 A CN108421981 A CN 108421981A CN 201710747406 A CN201710747406 A CN 201710747406A CN 108421981 A CN108421981 A CN 108421981A
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- pom
- degreasing
- injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
POM plastics as can the injection molding application of fusible core, the present invention relates to mold machining technology fields；Its processing flow is as follows：Metal dust granulation；POM material drying；POM is injection moulded；Double injection molding；Degreasing；Sintering.Product design degree of freedom is promoted, solve that conventional method can not demould the structure that 3D shapes are complicated and required with property such as is buckled to, is hollow；Quality problems and cost problem caused by the product of 3D shape labyrinth reduces the processes such as secondary operation；Product development cycle is greatly shortened, power is striven in occuping market unexpectedly.
Description
Technical field
The present invention relates to mold machining technology fields, and in particular to POM plastics are used as can the injection molding application of fusible core.
Background technology
MIM technologies as a kind of near-net-shape technology of manufacture high quality precision component there is conventional powder metallurgical, machine to add
Work and the incomparable advantage of casting method.It is widely used in metal forming.But with made of metal
Product are applied increasingly extensive, and more stringent requirements are proposed to the precision of product, shape, function, cost etc. by people, traditional injection
Moulding process has been difficult to adapt to this requirement.It is main to show since mold limits, it is realized on product structure certain specific
Function, it is higher the complexities such as need to be buckled to, is hollow, needs secondary operation such as vehicle, milling, brill etc. to increase process and increases cost, POM modelings
The molding of part Fusible core injection molding is imperative.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of processing simply, reasonable design
POM plastics as can the injection molding application of fusible core, promoted product design degree of freedom, solve conventional method can not demould fall
The 3D shapes such as button, hollow complexity and the structure with property requirement；The product of 3D shape labyrinth is reduced
Quality problems and cost problem caused by the processes such as secondary operation；Product development cycle is greatly shortened, power is striven in occuping market unexpectedly.
To achieve the above object, the technical solution adopted by the present invention is：Its processing flow is as follows：
1, metal dust granulation：The good metal powder of feeding (BASF) is put into comminutor, is 20~30r/ in rotating speed
It is kneaded 2~4 hours under min, the operating mode that temperature is 180~200 DEG C, the good material of batch mixing is pelletized through sheet twice, rodlike extruding, is made
Feeding is further uniform, closely knit, obtains the granular feeding suitable for injection；
2, POM material drying：It before the forming of POM plastics needs that 2~3h of time is dried to POM materials, drying temperature is
80~90 DEG C；
3, POM is injection moulded：POM material after drying are poured into hopper, are injected into soluble core shape, injection pressure 12
~16MPa, temperature are 160~210 DEG C, and the duration of pouring is 20~30s (specifically beating subject to full)；
4, double injection molding：The POM plastic cores of injection moulding are put into MIM mold cavities and are injection moulded, it is cooling
Afterwards including that the product of core takes out from cavity；
5, degreasing：Ungrease treatment is carried out to MIM workpiece using catalysis degreasing technology, the temperature of degreasing is 110-130 DEG C, into
Acid amount is 3.0-4.5g/min, and the time of degreasing is 2~6h (depending on having taken off subject to POM plastics)；
6, it is sintered：Formed products after degreasing are sintered, the temperature of sintering is 1250~1400 DEG C, and design parameter is as follows
Referring to table.
Further, in the step 4, cannot melt when POM plastics are put into MIM mold injections, material temperature can not
More than 200 ° mould temperature may not exceed 120 °.
Further, the POM plastics in the step 4 have certain positioning support force in MIM molds, inject
Journey POM plastics will not deform.
Further, the degreasing time in the step 5 will be according to POM plastics subject to, the time is appropriate with respect to 1mm/H
It lengthens.
Further, the degreasing parameter in the step 5 is appropriate, and rate is unsuitable too fast, too fast to lead to POM plastics
It is excessively violent with nitric acid reaction, destroy product.
The operation principle of the present invention：POM is first injected into Fusible core, is then put into using POM Fusible cores as inserts
Be injection moulded in mold, it is cooling after including that the product of core takes out from cavity, it is degreasing sintered to remove POM modelings
Part.
After above-mentioned technique, the present invention has the beneficial effect that：POM plastics of the present invention are used as can fusible core injection moulding
Application, promote product design degree of freedom, solve that conventional method can not demould is buckled to, is hollow etc. that 3D shapes are complicated and tool
Have specific characteristics the structure that can be required；The quality problems caused by the product of 3D shape labyrinth reduces the processes such as secondary operation
And cost problem；Product development cycle is greatly shortened, power is striven in occuping market unexpectedly.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is the process flow chart of the present invention.
Fig. 2 is the process parameter table of step 3 in specific implementation mode.
Fig. 3 is the process parameter table of step 4 in specific implementation mode.
Fig. 4 is the process parameter table of step 5 in specific implementation mode.
Fig. 5 is the process parameter table of step 6 in specific implementation mode.
Fig. 6 is the structural schematic diagram of embodiment processing part.
Fig. 7 is the decomposition diagram of embodiment processing part.
Reference sign：
1, MIM green compact；2、POM.
Specific implementation mode
The present invention will be further described below with reference to the drawings.
Referring to as Figure 1-Figure 5, present embodiment the technical solution adopted is that：Its processing flow is as follows：
1, metal dust granulation：The good metal powder of feeding (BASF) is put into comminutor, is 20~30r/ in rotating speed
It is kneaded 2~4 hours under min, the operating mode that temperature is 180~200 DEG C, the good material of batch mixing is pelletized through sheet twice, rodlike extruding, is made
Feeding is further uniform, closely knit, obtains the granular feeding suitable for injection；
2, POM material drying：It before the forming of POM plastics needs that 2~3h of time is dried to POM materials, drying temperature is
80~90 DEG C；
3, POM is injection moulded：POM material after drying are poured into hopper, are injected into soluble core shape, injection pressure 12
~16MPa, temperature are 160~210 DEG C, and the duration of pouring is 20~30s (specifically beating subject to full), and specific process parameter is referring to figure
2；
4, double injection molding：The POM plastic cores of injection moulding are put into MIM mold cavities and are injection moulded, it is cooling
Afterwards including that the product of core takes out from cavity, specific process parameter is referring to Fig. 3；
5, degreasing：Ungrease treatment is carried out to MIM workpiece using catalysis degreasing technology, the temperature of degreasing is 110-130 DEG C, into
Acid amount is 3.0-4.5g/min, and the time of degreasing is 2~6h (depending on having taken off subject to POM plastics), and specific process parameter is referring to Fig. 4；
6, it is sintered：Formed products after degreasing are sintered, the temperature of sintering is 1250~1400 DEG C, specific process parameter
Referring to Fig. 5.
Further, in the step 4, cannot melt when POM plastics are put into MIM mold injections, material temperature can not
More than 200 ° mould temperature may not exceed 120 °.
Further, the POM plastics in the step 4 have certain positioning support force in MIM molds, inject
Journey POM plastics will not deform.
Further, the degreasing time in the step 5 will be according to POM plastics subject to, the time is appropriate with respect to 1mm/H
It lengthens.
Further, the degreasing parameter in the step 5 is appropriate, and rate is unsuitable too fast, too fast to lead to POM plastics
It is excessively violent with nitric acid reaction, destroy product.
The working principle of this specific embodiment:：POM is first injected into Fusible core, then using POM Fusible cores as
Inserts is put into mold and is injection moulded, it is cooling after including that the product of core takes out from cavity, it is degreasing sintered to go
Except POM plastics.
After above-mentioned technique, present embodiment has the beneficial effect that：POM plastics described in present embodiment are made
For can the injection molding application of fusible core, promote product design degree of freedom, solve that conventional method can not demould is buckled to, is hollow etc. three
Tie up structure that is complex-shaped and being required with property；The works such as secondary operation are reduced to the product of 3D shape labyrinth
Quality problems caused by sequence and cost problem；Product development cycle is greatly shortened, power is striven in occuping market unexpectedly.
Embodiment：
Referring to Fig. 6 and Fig. 7, the present embodiment uses the product back-off structure of the application technology processing and fabricating, wherein POM to be embedded
In cavity in MIM green compact.
The above is merely illustrative of the technical solution of the present invention and unrestricted, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (5)
1.POM plastics are as can the injection molding application of fusible core, it is characterised in that：Its processing flow is as follows：
(1), metal dust granulation：The good metal powder of feeding is put into comminutor, is 20~30r/min, temperature in rotating speed
To be kneaded 2~4 hours under 180~200 DEG C of operating modes, the good material of batch mixing is pelletized through sheet twice, rodlike extruding, makes feeding into one
Walk it is uniform, closely knit, obtain suitable for injection granular feeding；
(2), POM material drying：Before the forming of POM plastics need that 2~3h of time, drying temperature 80 is dried to POM materials
~90 DEG C；
(3), POM is injection moulded：POM material after drying to be poured into hopper, are injected into soluble core shape, injection pressure is 12~
16MPa, temperature are 160~210 DEG C, and the duration of pouring is 20~30s；
(4), double injection molding：The POM plastic cores of injection moulding are put into MIM mold cavities and are injection moulded, after cooling
Including that the product of core takes out from cavity；
(5), degreasing：Ungrease treatment is carried out to MIM workpiece using catalysis degreasing technology, the temperature of degreasing is 110-130 DEG C, into acid
Amount is 3.0-4.5g/min, and the time of degreasing is 2~6h；
(6), it is sintered：Formed products after degreasing are sintered, the temperature of sintering is 1250~1400 DEG C.
2. POM plastics according to claim 1 are as can the injection molding application of fusible core, it is characterised in that：The step
Suddenly in (4), cannot melt when POM plastics are put into MIM mold injections, material temperature may not exceed 200 ° of mould temperature and may not exceed
120°。
3. POM plastics according to claim 1 are as can the injection molding application of fusible core, it is characterised in that：The step
Suddenly there is the POM plastics in (4) certain positioning support force, injection process POM plastics will not deform in MIM molds.
4. POM plastics according to claim 1 are as can the injection molding application of fusible core, it is characterised in that：The step
Suddenly the degreasing time in (5) will be according to POM plastics subject to, the time will suitably lengthen with respect to 1mm/H.
5. POM plastics according to claim 1 are as can the injection molding application of fusible core, it is characterised in that：The step
Suddenly the degreasing parameter in (5) is appropriate, and rate is unsuitable too fast, too fast that POM plastics and nitric acid reaction can be caused excessively violent, destroys production
Product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710747406.XA CN108421981A (en) | 2017-08-28 | 2017-08-28 | POM plastics are used as can the injection molding application of fusible core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710747406.XA CN108421981A (en) | 2017-08-28 | 2017-08-28 | POM plastics are used as can the injection molding application of fusible core |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109400172A (en) * | 2018-10-22 | 2019-03-01 | 厦门钜瓷科技有限公司 | The manufacturing method of inner hollow runner aluminium nitride ceramics device |
| CN109702209A (en) * | 2019-01-18 | 2019-05-03 | 佛山隆易科技有限公司 | A kind of manufacture contains the manufacturing method of profile-followed water route part |
| CN109732079A (en) * | 2019-01-29 | 2019-05-10 | 上海富驰高科技股份有限公司 | A kind of welding heat exchanger production technology |
| CN110640144A (en) * | 2019-10-22 | 2020-01-03 | 曲靖中铭科技有限公司 | Tapping-free sintering process for internal threads of MIM (metal injection molding) product |
| CN111496256A (en) * | 2020-04-30 | 2020-08-07 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten-based high-specific gravity alloy with internal channel |
| CN111515389A (en) * | 2019-04-20 | 2020-08-11 | 深圳市泛海统联精密制造股份有限公司 | Method for directly forming internal reverse buckle by MIM (metal injection molding) |
| CN112343948A (en) * | 2020-11-05 | 2021-02-09 | 三阳纺织有限公司 | Manufacturing method of mandrel component, mandrel component and textile machine applying mandrel component |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111515389A (en) * | 2019-04-20 | 2020-08-11 | 深圳市泛海统联精密制造股份有限公司 | Method for directly forming internal reverse buckle by MIM (metal injection molding) |
| CN110640144A (en) * | 2019-10-22 | 2020-01-03 | 曲靖中铭科技有限公司 | Tapping-free sintering process for internal threads of MIM (metal injection molding) product |
| CN111496256A (en) * | 2020-04-30 | 2020-08-07 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten-based high-specific gravity alloy with internal channel |
| CN112343948A (en) * | 2020-11-05 | 2021-02-09 | 三阳纺织有限公司 | Manufacturing method of mandrel component, mandrel component and textile machine applying mandrel component |
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Application publication date: 20180821 |