CN105149584B - A kind of powder injecting molding die and its application method - Google Patents
A kind of powder injecting molding die and its application method Download PDFInfo
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- CN105149584B CN105149584B CN201510618747.8A CN201510618747A CN105149584B CN 105149584 B CN105149584 B CN 105149584B CN 201510618747 A CN201510618747 A CN 201510618747A CN 105149584 B CN105149584 B CN 105149584B
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Abstract
The invention discloses a kind of powder injecting molding die, including dynamic model die and cover half die, inner chamber is provided with the dynamic model die, the profile of the cover half die is adapted with the inner chamber of dynamic model die, it is characterized in that, it is provided between dynamic model die and cover half die on gap, the inwall of dynamic model die inner chamber and is provided with the step for being provided with and being adapted with dynamic model die inwall step on step, the outer wall of cover half die.The degreasing sintered preceding product of powder metallurgy is prepared using the mould, its consistency can be substantially improved.
Description
Technical field
The present invention relates to a kind of powder injection-molded mould, more particularly to a kind of powder note for preparing compact formed part
Penetrate mould and the method for preparing shaped article using the mould.
Background technology
Powder Injection Molding Technology（Powder injection molding, abbreviation PIM）Be it is a kind of by metal dust with
Organic binder is mixed, and is injected into die cavity internal shaping with injection machine in a heated state, then with chemical solvent or heating
The method of decomposition removes adhesive, finally sinters the novel alloy production technology of densification product into.In recent years, as manufacture is complicated
The metal of shape or the development of ceramic post sintering body method technique, PIM technologies are applied in increasing field, especially MIM
（Metal Injection Molding, it is metal injection molded）And CIM（Ceramic Injection Molding ceramic injections
Shaping）Applied in all kinds of structural members, the moulding process of shaped piece.With the development of PIM technologies, size of each field to product
Precision, structural homogenity, mechanical property, production cost etc. propose higher and higher requirement, and this requires degreasing sintered preceding life
Embryo product has high density and structural homogenity, to reach the higher and higher performance requirement to product.
In the prior art, in order to lift the compactness extent of raw embryo product, often carried out using the minimum powder stock of particle diameter
Compacting, while the strictly homogeneity of control powder stock granularity, such as conventional powder metallurgical raw material granularity is 50-100 μm, once will
The particle mean size control of powder stock is 10 μm or so, then the compactness extent of MIM products can lift 20%-30%.But, to raw material
The granularity of powder, which is controlled, can bring being doubled and redoubled for material powder cost, while under the conditions of current technology, powder grain
The reduction degree of degree is also extremely limited.
Also many technologies improve mould used in preparation technology, such as Application No.
200510138082.7 it is entitled《Method and combination die for manufacturing fine and close metal powder parts》Chinese patent there is provided
A kind of mould for including upper die and lower die movable relative to each other from open position to closing position, in addition at least
One upper punch and at least one low punch being connected with the lower mould that are connected with the upper mould, this method utilize upper and lower mould
The powder to be compacted in die cavity is relatively moved with upper low punch to obtain densification product.This method step is relatively complicated, for
The compactness extent of powder compacting product improves also limited.
The content of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of powder injection mould for preparing compact formed part
Tool and the method for preparing shaped article using the mould, a note is carried out by the improvement to mould, and using improved mould
The matched moulds twice penetrated in the molding cycles cycle, can be in the case where other conditions change, to the raw embryo of dusty material
Product carries out secondary compaction, and the consistency of powder compacting product is substantially improved.
The technical problems to be solved by the invention are achieved by the following technical programs：
Inner chamber is provided with a kind of powder injecting molding die, including dynamic model die and cover half die, the dynamic model die,
The profile of the cover half die is adapted with the inner chamber of dynamic model die, it is characterised in that set between dynamic model die and cover half die
Have to be provided with step, the outer wall of cover half die on gap, the inwall of dynamic model die inner chamber and be provided with and wall stand in dynamic model die
The step that rank is adapted.
In existing mold technology, Split type die is typically made up of dynamic model and cover half, and dynamic model die and cover half die are
Necessary part on mould and cover half, dynamic model part can also include dynamic model foreboard, thimble, ejector retainner plate group in addition to dynamic model die
The components such as part, moving clamping plate；Cover half part can also include the components such as cover half template, feed nozzle in addition to cover half die.This hair
Dynamic model die and cover half die in bright scheme can be loaded into any mould of the prior art.
It is that mould can be used that set inner chamber is adapted with the profile of cover half die on dynamic model die in Split type die
Necessary condition.In the solution of the present invention, gap is provided between dynamic model die and cover half die, partly in order in compacting powder
The gas allowed during powder stock in raw material has passage to discharge, and on the other hand sets the gap that certain angle is presented with thimble direction
Degree can allow dynamic model die and cover half die more smoothly when loading cooperation, during compacted products, pressure can along gap side
Put on to what is be more uniformly distributed on molded samples, while the raw material in being die cavity in first matched moulds and injection pressure maintaining period
There is provided more sufficient space makes what the binding agent in powder stock melted to be more uniformly distributed, and then sinters subsequent forming product
It is more uniform.Dynamic model die and cover half die have certain form and position tolerance when loading and coordinating, and rationally set therebetween
The influence to shaped article size that a little bias that gap length can also suitably avoid die from occurring in process is brought.
The present inventor show that set gap thickness is 0.1-0.5mm between dynamic model die and cover half die by many experiments
It is advisable, the gap and thimble direction institute are angled to be advisable for 1-15 °.
Meanwhile, it is provided with step, the outer wall of cover half die and is provided with and dynamic model die on the inwall of dynamic model die inner chamber
The step that inwall step is adapted, makes dynamic model die be effectively formed the cavity of closing with cover half die.In common mould, dynamic model
Die can produce the poor dislocation of certain shape when loading and coordinating unavoidably with cover half die, set step to be prevented effectively from this
The generation of situation and cause powder stock leakage occur（" run material "）Situation, and be follow-up secondary close press-fitting mould step
Rapid provide continues the path that compacted powder raw material is molded idiosome.On the inwall of dynamic model die inner chamber set step can for one-level or
On multistage, corresponding cover half die outer wall the prefabricated step being adapted or one or more levels.If to mould molding cavity
Closure have higher requirement, then step can be set to two-stage or multistage as desired, step shape also can be according to specific
Demand is adjusted.
Set length of bench is the 3-15% of injection-molded product thickness on the inwall of dynamic model die inner chamber, i.e., theoretically
Say, by that product consistency can be lifted into 3-15% in the compacting process in secondary close press-fitting mould step.But from the reality of inventor
Trample in experience and draw, under the processing conditions of common clamping, unconfined powder stock can not be pressed always
It is real, once more serious raw material leakage occurs in hypertonia, die cavity used in during secondary close press-fitting mould（I.e.
" running material "）Situation.The present inventor is found through experiments that, the mixing ratio according to the granularity of powder stock and with binding agent
Upper set length of bench on cavity wall in dynamic model die is set to the 3-15% of injection-molded product thickness preferably to set by example.
If raw material granularity is larger, and binding agent is general to the wetability of material powder, then can adjust above-mentioned length of bench is 8-15%；If
Raw material granularity is smaller, and binding agent is good to separation wetability, then can adjust above-mentioned length of bench is 5-10%；If raw material and binding agent
The compactness of itself is just more excellent, then above-mentioned length of bench is adjusted for 3-5%, for different powder and binding agent
System, which makes appropriate adjustment, can not only maximize the utilization rate to powder stock, and can be protected during mass production
Demonstrate,prove the stability of shaped article consistency lifting.The present inventor had found by many experiments, be 10 μm to particle mean size-
When material powder in 50 μ ms is suppressed, the inwall top bar length for setting dynamic model die inner chamber is injection-molded product
The 10% of thickness, can lift nearly 10% by injection molding product consistency at optimum conditions.
The set length of bench being adapted with the inwall of dynamic model die inner chamber can be with dynamic model die on cover half die outer wall
The inwall top bar length of inner chamber is consistent.Further preferably, on cover half die outer wall set length of bench than dynamic model mould
Set length of bench is short on the inwall of benevolence inner chamber, makes dynamic model die and cover half die formation closed cavity so as to more efficiently.
A kind of method for preparing shaped article using above-mentioned powder injecting molding die, comprises the following steps：
（1）First matched moulds：It is by clamping that dynamic model die is mobile for the first time to cover half die, dynamic model is closed with cover half
Close, make dynamic model die and cover half die formation closed cavity, one section of preset space is kept between dynamic model and cover half；
Step（1）For first time matched moulds, it is therefore an objective to be tentatively compacted powder stock, reach mould-cavity temperature and pressure required
Value, discharge powder stock in gas, allow product just one-step forming.Above-mentioned clamping may be selected to be any suitable commercially available injection
Machine or forcing press, are if desired heated, forcing press can Heating System Supporting use.
（2）Inject pressurize：By injecting feeding mechanism, powder stock is injected in mold cavity by feed nozzle, treated
Feed pressure is kept after being full of raw material in mold cavity.Feed system of the prior art may be selected in injection feed system, such as notes
Molding machine screw fed systems.Keep feed pressure further to promote exhaust, and effectively make product uniform.
（3）Close press-fitting mould：Step（2）After the completion of, by clamping by dynamic model die to second of the movement of cover half die,
Until the die joint of dynamic model and cover half is closed completely, i.e., preset space between dynamic model and cover half is removed completely, makes product in die cavity
Further compacting.
This step is second of compacting operation of mould, i.e., the precondition of suitable temperature and pressure has been reached in die cavity
Under product compaction again.Preset space between dynamic model and cover half is not more than on cover half die outer wall and dynamic model die inner chamber
The length of bench that set step is adapted on inwall.Corresponding, the preset space between dynamic model and cover half forms product for injection
The 3-15% of thickness, is preferably further the 10% of injection-molded product thickness.Such length is set, and can both ensure step
（1）The closure of middle dynamic model die and cover half die cavity, or step（3）In the process of second matched moulds compacting provide
The moveable path of dynamic model, after the completion of secondary compaction operation can effective hoist type intracavitary product consistency.
（4）Mold pickup：Mould is cooled down by the cooling system of mould, feeding mechanism is removed, opens dynamic model, pass through mould
In ejector pin component product is ejected.Cooling-water machine general in industry can be used in the cooling system of mould.
The present invention has the advantages that：
1st, the compactness extent of degreasing sintered preceding shaped article in powder metallurgy is effectively lifted, it is optimal to put forward product consistency
10% is risen, so as to effectively lift the consistency of finished product after sintering.
2nd, dependence that need not be undue reduce raw material powder particle size and Control granularity uniformity improve product density and
Compactness, it is possible thereby to reduce the cost of product, improves competitiveness.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram that powder injecting molding die of the present invention prepares shaped article.
Fig. 2 is the first matched moulds step schematic diagram of powder injecting molding die of the present invention.
Fig. 3 is the close press-fitting mould step schematic diagram of powder injecting molding die of the present invention.
Fig. 4 is that powder injecting molding die of the present invention molds pickup step schematic diagram.
Label declaration in figure：
1- dynamic model die 2- thimble 3- moving clamping plate 4- ejector retainner plate lead 5- thimble board components
6- dynamic model foreboard 7- cover half die 8- feed nozzle 9- cover half template 10- push rods
Gap 13- steps between 11- products 12- dynamic models die and cover half die（At oval frame mark）14- partings
Face 111- dynamic model 112- cover half
At A distance be first matched moulds step in, the preset space kept between dynamic model and cover half.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
The injection machine and corollary system commonly used in Powder Metallurgy Industry, the powder stock granularity of selection are utilized in the present embodiment
10 μm of average out to, by mould installion on injection molding machine.This part is prior art, at once technology commonly used in the trade, herein seldom
Plus repeat.
As shown in drawings, mould includes dynamic model 111 and cover half 112.Dynamic model 111 includes dynamic model die 1, thimble 2, moving die bottom
Plate 3, ejector retainner plate lead 4, thimble board component 5, dynamic model foreboard 6.Cover half 112 includes cover half die 7, feed nozzle 8, cover half template
9.Wherein dynamic model 111 is connected with cover half 112 by push rod 10, and dynamic model 111 is moved along push rod 10.Dynamic model foreboard 6 is consolidated
Surely dynamic model die 1 is supported, thimble board component 5 fixes thimble 2, and ejector retainner plate lead 4 is sequentially connected with dynamic model foreboard 6, ejector retainner plate group
Part 5 and moving clamping plate 3.In cover half 112, the fixed bearing cover half die 7 of cover half template 9, cover half die 7 not with dynamic model die 1
The opposite side connected is provided with the feed nozzle 8 matched with cover half die 7.
Above-mentioned die assembly is the common implementation of mould of the prior art, it is necessary in explanation, the present invention
Though method of the mould suitable for the present embodiment, is not limited only to use on mould in the present embodiment, for example, although this hair
The mould used in bright embodiment is that mould and method in horizontal type structure, the present invention are equally applicable to the mould of vertical structure.
Cavity wall in gap 12, dynamic model die 1 is provided between dynamic model die 1 and cover half die 7 and is provided with step 13, step
Length is to be provided with the step being adapted therewith on the 10% of shaped article thickness, the outer wall of cover half die 7.The outer wall of cover half die 7
On step it is slightly shorter than the step on inner wall in dynamic model die 1.Set the gap 12 between dynamic model die 1 and cover half die 7
Thickness is 0.1mm, and it is 5 ° that gap 12 is angled with thimble direction.
The method that shaped article is prepared using above-mentioned powder injecting molding die, step is as follows：
（1）First matched moulds
As shown in Fig. 2 moving dynamic model die 1 for the first time to cover half die 7 by the clamping of equipment, make dynamic model
111 are closed with cover half 112, form closed cavity, and one section of preset space is retained between dynamic model 111 and cover half 112（In such as Fig. 2 at A
It is shown）The length of the preset space is the 10% of injection-molded product thickness.Powder stock is compacted, makes mould-cavity temperature and pressure
Reach desirable value, the gas in discharge powder stock allows the just one-step forming of product 11.
（2）Inject pressurize
By the injection feeding mechanism of equipment, powder stock is injected in mold cavity by feed nozzle 8, mould type is treated
Intracavitary keeps feed pressure after being full of raw material.
（3）Close press-fitting mould
Step（2）After the completion of, the clamping of equipment to second of the movement of cover half die 7, further squeezes dynamic model die 1
Product in compression mould die cavity, until the die joint 14 of dynamic model 111 and cover half 112 is closed completely, i.e., completely removal dynamic model 111 and
Preset space between cover half 112（As shown in A in Fig. 2）, product in die cavity is further compacted.
（4）Mold pickup
Mould is cooled down by the cooling system of mould, feeding mechanism is removed, opens dynamic model 111, pass through the thimble in mould
Component ejects product.
Due to there is the process of secondary close pressure, what the shaped article after being compacted by above-mentioned steps was obtained than conventional method
Product is more densely cross-linked, consistency lifting nearly 10%.The product obtained in this way after sintering, the compactness and power of product
Learning performance can be remarkably enhanced.
It is last it should be noted that above example is only entered to the technical scheme that illustrates the embodiment of the present invention rather than to it
Row limitation.Although the embodiment of the present invention is described in detail with reference to preferred embodiment, one of ordinary skill in the art
It should be understood that the technical scheme of the embodiment of the present invention can still be modified or equivalent substitution, and these are changed or waited
It can not also make the scope of amended technical scheme disengaging technical scheme of the embodiment of the present invention with replacing.
Claims (8)
1. inner chamber is provided with a kind of powder injecting molding die, including dynamic model die and cover half die, the dynamic model die, institute
The profile for stating cover half die is adapted with the inner chamber of dynamic model die, it is characterised in that：
It is provided between dynamic model die and cover half die on gap, the inwall of dynamic model die inner chamber and is provided with step, cover half die
The step being adapted with dynamic model die inwall step is provided with outer wall, the gap thickness between dynamic model die and cover half die is
0.1-0.5mm；
The method for preparing shaped article of the powder injecting molding die comprises the following steps：
（1）First matched moulds：It is by clamping that dynamic model die is mobile for the first time to cover half die, dynamic model and cover half are closed,
Make dynamic model die and cover half die formation closed cavity, one section of preset space is kept between dynamic model and cover half；
（2）Inject pressurize：By injecting feeding mechanism, powder stock is injected in mold cavity by feed nozzle, mould is treated
Feed pressure is kept after being full of raw material in die cavity；
（3）Close press-fitting mould：Step（2）After the completion of, by clamping by dynamic model die to second of the movement of cover half die, until
The die joint of dynamic model and cover half is closed completely, i.e., remove preset space between dynamic model and cover half completely, product in die cavity is entered one
Step compacting；
（4）Mold pickup：Mould is cooled down by the cooling system of mould, feeding mechanism is removed, dynamic model is opened, by mould
Ejector pin component ejects product.
2. the powder injecting molding die according to claim 1, it is characterised in that：Between dynamic model die and cover half die
Gap is in 1-15 degree angle with thimble direction.
3. the powder injecting molding die according to claim 1, it is characterised in that：It is set on the inwall of dynamic model die inner chamber
Length of bench is the 3-15% of injection-molded product thickness.
4. the powder injecting molding die according to claim 1, it is characterised in that：It is set on the inwall of dynamic model die inner chamber
Step can be one or more levels.
5. the powder injecting molding die according to claim 1, it is characterised in that：Set step is long on cover half die outer wall
Degree is shorter than set length of bench on the inwall of dynamic model die inner chamber.
6. the powder injecting molding die according to claim 1, it is characterised in that：In the method for preparing shaped article, dynamic model
Preset space between cover half is not more than on cover half die outer wall to be adapted with set step on the inwall of dynamic model die inner chamber
Length of bench.
7. the powder injecting molding die according to claim 1, it is characterised in that：In the method for preparing shaped article, dynamic model
Preset space between cover half is the 3-15% of injection-molded product thickness.
8. the powder injecting molding die according to claim 1, it is characterised in that：In the method for preparing shaped article, dynamic model
Preset space between cover half is the 10% of injection-molded product thickness.
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| CN108909007B (en) * | 2018-07-03 | 2021-10-01 | 厦门泰启力飞科技有限公司 | Graphene die-casting forming process |
| CN110756736A (en) * | 2019-12-03 | 2020-02-07 | 广州市型腔模具制造有限公司 | Step mould cover half |
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| CN201721006U (en) * | 2010-06-11 | 2011-01-26 | 富港电子（东莞）有限公司 | Injection mold |
| CN201997709U (en) * | 2011-01-18 | 2011-10-05 | 常州精研科技有限公司 | Powder injection molding concave-convex wheel die with depressed thimble device |
| CN102218520A (en) * | 2011-05-26 | 2011-10-19 | 哈尔滨工业大学 | Light-alloy die-casting, filling, forging and compacting integrated forming device and forming method |
| CN202169668U (en) * | 2011-06-10 | 2012-03-21 | 东莞劲胜精密组件股份有限公司 | Injection mould |
| CN204912766U (en) * | 2015-09-25 | 2015-12-30 | 宋佳 | Powder injection molding mould |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7182904B2 (en) * | 2003-12-23 | 2007-02-27 | Lear Corporation | Low pressure laminate gas assist molding |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201721006U (en) * | 2010-06-11 | 2011-01-26 | 富港电子（东莞）有限公司 | Injection mold |
| CN201997709U (en) * | 2011-01-18 | 2011-10-05 | 常州精研科技有限公司 | Powder injection molding concave-convex wheel die with depressed thimble device |
| CN102218520A (en) * | 2011-05-26 | 2011-10-19 | 哈尔滨工业大学 | Light-alloy die-casting, filling, forging and compacting integrated forming device and forming method |
| CN202169668U (en) * | 2011-06-10 | 2012-03-21 | 东莞劲胜精密组件股份有限公司 | Injection mould |
| CN204912766U (en) * | 2015-09-25 | 2015-12-30 | 宋佳 | Powder injection molding mould |
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Effective date of registration: 20170220 Address after: Fenggang town of bamboo village 523682 Guangdong city of Dongguan province Tong Fumin Road No. 43 by a building A and B Applicant after: DONGGUAN YIHAO METAL MATERIAL TECHNOLOGY CO., LTD. Address before: Longgang street, Longgang City Peng Dharma District of Shenzhen City, Guangdong province 1204 518116 Applicant before: Song Jia |
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