CN105479687A - Micro mold for injection molding - Google Patents
Micro mold for injection molding Download PDFInfo
- Publication number
- CN105479687A CN105479687A CN201511008945.9A CN201511008945A CN105479687A CN 105479687 A CN105479687 A CN 105479687A CN 201511008945 A CN201511008945 A CN 201511008945A CN 105479687 A CN105479687 A CN 105479687A
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- Prior art keywords
- micro
- mold
- die
- injection molding
- cavity
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 7
- 238000011049 filling Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910001651 emery Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000520 microinjection Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008393 encapsulating agent Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000001053 micromoulding Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a micro mold for injection molding. The micro mold comprises a fixed mold provided with a main runner, a movable mold, a mold core fixed to the movable mold and an ejection device, an insert used for forming a cavity is arranged in the mold core in an embedded mode, an auxiliary runner communicated with the cavity is formed in the upper surface of the mold core, and an ejection rod of the ejection device penetrates through the mold core and directly reaches the auxiliary runner in the ejection process; the movable mold is provided with a vacuumized channel communicated with the cavity and a vacuum pump, and seal rings are arranged on the parting face of the fixed mold, the parting face of the movable mold, the ejection rod and a sprue connected to the main runner. According to the invention, the separation structure is adopted, the cavity of the micro mold is formed in a mold plate through the insert and can be replaced conveniently when forming parts are damaged or different plastic parts are machined, the vacuum pump exhausts gas from the cavity, and therefore the quality of the formed plastic parts is good, the cost is low, the productivity is high, and large-scale manufacturing is easy to realize.
Description
Technical field
The present invention relates to a kind of use in injection molding micro-mould and Micrometer-Nanometer Processing Technology field, be specifically related to a kind of use in injection molding micro-mould.
Background technology
Along with the rise of the new branch of science such as the later stage eighties 20th century MEMS (MEMS), the Design and manufacture of industrial products presents the development trend of microminiaturization, lightweight, precise treatment.Micro injection molding, as a kind of micro molding process, has product material, geometry and size adaptability is good, cost is low, efficiency is high, and can the series of advantages such as serialization, automated production, is the important development direction manufacturing microminiature product on a large scale.
Injection mo(u)lding micro-mould is because of its die cavity and the grand-micro-scale scope of channel size leap, be subject to the impact of dimensional effect, in forming process melt flowing, heat transfer all different under macro-scale, to the temperature of mould, the demoulding pickup etc. of the ventilation of die cavity, exhaust, micro-plastic has particular/special requirement, traditional Design of Dies Theories and methods is no longer applicable in micro injection molding die design, mainly comprises die temperance control system, gas extraction system and ejection system.In micro injection molding, because mold cavity surface to volume ratio is large, cause melt temperature large in filling phase change scope, have a strong impact on Forming Quality and the molding cycle of micro-plastic, therefore, micro-mould needs design dynamic mold temperature control system usually.Because micro-mould surface processing accuracy is high, when after mould matched moulds, gap between dynamic model and cover half is very little, the gas of air residual in die cavity and melt release is difficult to discharge completely from die cavity gap, this can affect filling melt rate and micro-plastic parts moulding quality, and therefore micro-mould will design vacuum pumping system.Because micro-plastic part quality is light, wall is thin, intensity is low, traditional mould emptier, the pushing method that namely push rod and plastic directly contact can destroy micro-structural, has a strong impact on the Forming Quality of micro-plastic, therefore wants micro-plastic pushing method reasonable in design.
In addition, minisize mould preparation method conventional at present, is utilized MEMS technology to be combined with electrocasting, is realized the preparation of micro-structural by photoetching and plasma etching, have the advantage of high accuracy, mass.But apparatus expensive, mould machine intensity is low, and the life-span is shorter.
Summary of the invention
For above various problems, the present invention devises the use in injection molding micro-mould that a kind of structure is simple, Forming Quality is high, molding cycle is short.
The technical solution used in the present invention is as follows:
A kind of use in injection molding micro-mould, comprise the cover half, dynamic model, die, the liftout attachment be fixed on described dynamic model that are provided with sprue, be provided with the insert for the formation of die cavity with inlaying in described die, the upper surface of described die is provided with the runner being communicated with described die cavity, to go directly runner when the push rod of described liftout attachment ejects through die; Described dynamic model is provided with the evacuation passageway being communicated with described die cavity and vavuum pump, on the die joint of described fixed half and moving half and push rod, the sprue bush that connects sprue is provided with sealing ring.
This programme gas extraction system adopts vacuum exhaust mode, die joint offers exhaust passage, by die cavity environmental seal, utilizes vavuum pump extracted out from die cavity by gas thus improve filling melt rate and product molding quality.Liftout attachment adopts and indirectly ejects, and push rod acts on the plastic that is positioned on runner, indirectly drives the plastic member product demoulding, does not damage shaping plastic, ensure that the Forming Quality of plastic by runner and cast gate.
Further, also comprise die temperance control system, described die temperance control system comprises temperature sensor, be separately positioned on fixed half and moving half in and be positioned at some electrical bars of die cavity both sides and be arranged symmetrically in some cooling water path of described electrical bar periphery, described temperature sensor is for controlling the switch of electrical bar power supply, realize the heating and cooling to mould, and then realize continuously shaped.
Further, the surface of described insert is provided with the micro-structural of skive processing, for the formation of the micro-structural on injection-molded finished surface.
Further, described micro-structural comprises V groove, trapezoidal groove, micro-cone tower, micro-rectangular channel.
The present invention compared with prior art has the following advantages:
(1) compared with common injection mo(u)lding micro-mould, adopt the micro-mould filling melt rate after above improvement high, plastic parts moulding quality is good, is easy to realize extensive manufacture.
(2) skive after utilizing finishing can make the micro-structural with given shape at surface of the work, and equipment cost is low compared with the processing method based on photoetching, etching, technique simple, the material that the plastic hardness of skive is higher.
(3) the workpiece micro-structure surface of working it out is smooth, and precision is high.
Accompanying drawing explanation
Fig. 1 is the overall schematic front view of injection mo(u)lding micro-mould of the present invention.
Fig. 2 is the pumped vacuum systems cross-sectional schematic of injection mo(u)lding micro-mould of the present invention.
Fig. 3 is A place enlarged diagram in Fig. 2.
Fig. 4 is the insert structure schematic diagram of injection mo(u)lding micro-mould of the present invention.
Fig. 5 is the another kind of insert structure schematic diagram of injection mo(u)lding micro-mould of the present invention.
Fig. 6 is the insert machining sketch chart of injection mo(u)lding micro-mould of the present invention.
Fig. 7 is the mould core structure schematic diagram of injection mo(u)lding micro-mould of the present invention.
Shown in figure be: 1-cover half; 2-dynamic model; 3-die; 4-evacuation passageway; 5-sealing ring; 6-insert; 7-sprue; 8-runner; 9-die cavity; 10-push rod.
Detailed description of the invention
Be described in further detail object of the present invention below by specific embodiment, embodiment can not repeat one by one at this, but therefore embodiments of the present invention are not defined in following examples.
As shown in Figure 1 to Figure 3, a kind of use in injection molding micro-mould, comprise the cover half 1, dynamic model 2, die 3, the liftout attachment be fixed on described dynamic model 2 that are provided with sprue 7, be provided with the insert 6 for the formation of die cavity 9 with inlaying in described die 3, the upper surface of described die 3 is provided with the runner 8 being communicated with described die cavity 9, to go directly runner 8 when the push rod 10 of described liftout attachment ejects through die 3; Described dynamic model 2 is provided with the evacuation passageway 9 being communicated with described die cavity 9 and vavuum pump, on the die joint of described cover half 1 and dynamic model 2 and push rod 10, the sprue bush that is connected sprue 7 is provided with sealing ring 5.
Gas extraction system of the present invention adopts vacuum exhaust mode, die joint offers exhaust passage, by die cavity environmental seal, vavuum pump is utilized to be extracted out from die cavity by gas thus improve filling melt rate and product molding quality, sealing ring 5 adopts O RunddichtringO, sprue 7 and runner 8 seal with die joint simultaneously, encapsulant requires good greasy property, anti-wear performance and resistance to elevated temperatures, the design of vacuum lead as shown in Figure 2, after mould is closed, when injection molding machine nozzle withstands on mould sprue 7 porch, mould inside forms closed space, at this moment external vaccum-pumping equipment is taken away by the air of evacuation passageway 9 by mold cavity, for making evacuation time short, select larger vavuum pump and shorter pipeline as far as possible, .
Micro-plastic part quality is light, wall is thin, intensity is low; tradition mould emptier can make micro-structural be out of shape, even damage; affect the Forming Quality of plastic; the liftout attachment of the present embodiment adopts indirectly ejecting of directly not contacting with product face; push rod 10 acts on the plastic that is positioned on runner 8, indirectly drives the plastic member product demoulding, indirectly steadily ejected by plastic by runner and cast gate; do not damage shaping plastic, ensure that the Forming Quality (see Fig. 7) of plastic.
Specifically, the use in injection molding micro-mould of the present embodiment also comprises die temperance control system, described die temperance control system comprises temperature sensor, to be separately positioned in cover half 1 and dynamic model 2 and to be positioned at four electrical bars at 25mm place, die cavity 9 both sides, and be arranged symmetrically in four cooling water path of described electrical bar periphery, each two diameter phi 8mm electrical bars in cover half 1 and dynamic model 2, the power of every root electrical bar is 500W, cooling water path diameter is φ 8mm, described temperature sensor is for controlling the switch of electrical bar power supply, before injection mo(u)lding with electrical bar to mold heated, injection mo(u)lding is started after reaching predetermined temperature, plastic is filled completely and is disconnected electrical bar by described temperature sensor, start to connect cooling water path, drop to the demoulding after predetermined temperature, eject plastic, the switch of heating and cooling is switched by setting-up time, realize the heating and cooling to mould, and then realize continuously shaped.Improve injection moulding efficiency.
Specifically, the surface of described insert 6 is provided with the micro-structural of skive processing, for the formation of the micro-structural on injection-molded finished surface, described micro-structural comprises V groove (Fig. 4), trapezoidal groove (Fig. 5), micro-cone tower, micro-rectangular channel.
As shown in Figure 6, the micro-structural of described insert 6 uses the method for micro-grinding to process.Insert 6 level is put on lathe workbench, in the insert 6 fixed, straight reciprocating motion is done by being trimmed to the effigurate skive of tool, process the micro-structural with given shape, as processed the trapezoidal groove array structure shown in the V groove array structure shown in Fig. 4 and Fig. 5.Add that first to utilize the skive of coarseness to carry out roughing man-hour shaping, leave suitable surplus, recycle fine-grained emery wheel and carry out fine finishining to meet the requirements of size and roughness.Micro-mould and the nondistinctive position of traditional moulds still adopt conventional method to process.
Specifically, when processing the micro-structural on insert 6 surface, first the insert 6 wearing into preliminary dimension and surface roughness is clipped on vice, vice is fixed on magnetic force platform, adopt after mixing up position the skive of the coarseness trimmed insert 6 on the surface grinding go out to have the micro-structural of wheel face shape, then, in same orientation, utilize fine-grained skive to be refined by the workpiece after slightly shaping, process more smooth surface.
The skive of described coarseness is made up of diamond abrasive and bronze binding agent, and diamond abrasive granularity is 60 ~ 200 orders; Described fine-grained emery wheel is made up of diamond abrasive and resinoid bond, diamond abrasive granularity 1500 ~ 4000 order.Grinding wheel speed is 2000 ~ 5000 revs/min; In the thick molding process of micro-structural, emery wheel feeding depth is 10 ~ 40 microns/every stroke, and feed speed is 5 ~ 30 millis m/min; The shaping feeding depth of fine finishining is 1 ~ 10 micron/every stroke, and feed speed is 1 ~ 5 milli m/min.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (4)
1. a use in injection molding micro-mould, comprise the cover half (1), dynamic model (2), die (3), the liftout attachment be fixed on described dynamic model (2) that are provided with sprue (7), it is characterized in that: in described die (3), be provided with the insert (6) for the formation of die cavity (9) with inlaying, the upper surface of described die (3) is provided with the runner (8) being communicated with described die cavity (9), through the through runner (8) of die (3) when the push rod (10) of described liftout attachment ejects; Described dynamic model (2) is provided with and is communicated with described die cavity (9) and the evacuation passageway (9) of vavuum pump, the sprue bush that sprue (7) was gone up, was connected to the die joint of described cover half (1) and dynamic model (2) and push rod (10) is provided with sealing ring (5).
2. use in injection molding micro-mould according to claim 1, it is characterized in that: also comprise die temperance control system, described die temperance control system comprises temperature sensor, be positioned at some electrical bars of die cavity (9) both sides and be arranged symmetrically in some cooling water path of described electrical bar periphery in be separately positioned on cover half (1) and dynamic model (2), and described temperature sensor is for controlling the switch of electrical bar power supply.
3. use in injection molding micro-mould according to claim 1, is characterized in that: the surface of described insert (6) is provided with the micro-structural of skive processing.
4. use in injection molding micro-mould according to claim 3, is characterized in that: described micro-structural comprises V groove, trapezoidal groove, micro-cone tower, micro-rectangular channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008945.9A CN105479687A (en) | 2015-12-27 | 2015-12-27 | Micro mold for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008945.9A CN105479687A (en) | 2015-12-27 | 2015-12-27 | Micro mold for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105479687A true CN105479687A (en) | 2016-04-13 |
Family
ID=55667127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511008945.9A Pending CN105479687A (en) | 2015-12-27 | 2015-12-27 | Micro mold for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105479687A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107825666A (en) * | 2017-11-14 | 2018-03-23 | 中山市高远精密模具有限公司 | A kind of Vacuuming structure of mould |
| CN107932843A (en) * | 2017-11-10 | 2018-04-20 | 广东泰安模塑科技股份有限公司 | A kind of mould structure of adjustable exhaust clearance |
| CN109421239A (en) * | 2017-09-04 | 2019-03-05 | 临沂大学 | A kind of superthin plastic part dynamic analog temperature vacuum forming system |
| CN111902254A (en) * | 2018-03-27 | 2020-11-06 | 住友重机械工业株式会社 | Mold system |
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| CN203472061U (en) * | 2013-08-19 | 2014-03-12 | 台州市凯华塑业有限公司 | Automatic-snap side gate mechanism of two-plate injection mold |
| CN204076672U (en) * | 2014-09-23 | 2015-01-07 | 天津联欣盈塑胶科技有限公司 | A kind of television stand injection forming mold |
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| CN205326183U (en) * | 2015-12-27 | 2016-06-22 | 华南理工大学 | Injection moulding is with little mould |
-
2015
- 2015-12-27 CN CN201511008945.9A patent/CN105479687A/en active Pending
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| EP1407869A1 (en) * | 2002-10-11 | 2004-04-14 | Liteco S.R.L. | Standardised modular system for moulds of injection moulding machines |
| CN101468512A (en) * | 2007-12-29 | 2009-07-01 | 鸿富锦精密工业（深圳）有限公司 | Mold |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109421239A (en) * | 2017-09-04 | 2019-03-05 | 临沂大学 | A kind of superthin plastic part dynamic analog temperature vacuum forming system |
| CN107932843A (en) * | 2017-11-10 | 2018-04-20 | 广东泰安模塑科技股份有限公司 | A kind of mould structure of adjustable exhaust clearance |
| CN107932843B (en) * | 2017-11-10 | 2019-08-23 | 广东泰安模塑科技股份有限公司 | A kind of mould structure of adjustable exhaust clearance |
| CN107825666A (en) * | 2017-11-14 | 2018-03-23 | 中山市高远精密模具有限公司 | A kind of Vacuuming structure of mould |
| CN111902254A (en) * | 2018-03-27 | 2020-11-06 | 住友重机械工业株式会社 | Mold system |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160413 |
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| RJ01 | Rejection of invention patent application after publication |