CN1373033A - Injection moulding process - Google Patents
Injection moulding process Download PDFInfo
- Publication number
- CN1373033A CN1373033A CN 01144774 CN01144774A CN1373033A CN 1373033 A CN1373033 A CN 1373033A CN 01144774 CN01144774 CN 01144774 CN 01144774 A CN01144774 A CN 01144774A CN 1373033 A CN1373033 A CN 1373033A
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- battery
- injection moulding
- metal die
- cavity
- moulding process
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- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
An injection molding method is realized using a metal mold (1) having a cavity (8), in which an internal piece as battery (3, 19) is fixedly housed and which is filled with a melted thermoplastic resin (P). Although the internal piece got low dimensions exactitude, causing aperture formations whose range is between 0.02 mm and 0.08 mm in a certain location between the internal wall of the cavity and the internal piece, it is possible to prevent the melted resin to flow within the aperture causing the formation of undesired chips in the molded product. Because this method employs a polyamide resin whose viscosity range is of 1000mPa*s a 3000mPa*s, melted at a relatively low temperature, the molded product. Because this method employs a polyamide can be injected within the metal mold cavity at a low injection pressure whose range is of 0.3Mpa to 0.6Mpa.
Description
Technical field
The present invention relates to carry out the injection moulding process of injection moulding, so that give mechanical part and/or electronic component coating with resin material.Specifically, be on low etc. or the rough parts or the element of appointed product or article, to carry out injection moulding, because structure or economic cause can not always be made described parts or element with the high accuracy size, make their surface portion like this or all plate resin material.
Background technology
With regard to tradition, as the injection moulding process with resin treatment specified parts or element, the injection moulding of finished product embedding lining is known.In general, metal die is used in the injection moulding of finished product embedding lining, will intend with the parts of resin treatment or element fixed placement in inside.Just resin material is infused in the cavity that forms between inner member and the metal die.In the space or gap beyond if resin material flows between inner member and the metal die, promptly from resin material the cavity that should inject flow out, then may produce burr, this burr is retained on the injection-molded item, this dislikes for the producer.In order to prevent to make described gap minimum in this undesirable space or gap between resin material inflow inner member and the metal die reliably as far as possible.
In common injection moulding, the standard plastic material being used for injection moulding is heated to molten condition as polystyrene, and injects under very high pressure in the cavity, and described pressure is set and is about 1 * 10
8Pa.Therefore, injection moulding requires to make the gap between inner member and the metal die be reduced to 0.01mm or littler width usually.In order to satisfy such requirement, adopted multiple measure traditionally.For example, make inner member, perhaps use strong hold-down screw to clamp metal die, make gap between inner member and the metal die seal closely or airtight with high dimension precision.
Recently, portable telephone device has cell module as cell phone or phs terminal (" PHS " is the abbreviation of " personal handyphone system "), and battery is equipped with in the inside.Cell module (abbreviating " battery " as) structures that adopt appointment more, wherein with cell package in slim shell.Perhaps battery is contained in the formed housing of deep-draw aluminum, so that can put into the shell nozzle of battery by the sealing of methods such as welding.Said structure can not use formed gap on the screw enclosed, outer surface.In addition, said structure is difficult to make battery with high dimension precision, and they may cause manufacturing cost to increase in other words.
The thin battery that battery is encapsulated in the thin case may be easily deformable because of the external force that is applied thereto, and therefore, forms the gap easily between battery and metal die.Battery is installed in deep-draw type battery in the formed housing of deep-draw aluminum, and separately the dimensional accuracy of one side is lower, greatly about 0mm to-0.04mm scope.Promptly corresponding with the lower battery of dimensional accuracy inner member is placed in the higher metal die cavity of dimensional accuracy.In this case, between inner member and metal die, should form width and be gap about 0.08mm to the maximum.In brief, it is very difficult carrying out the injection moulding of finished product embedding lining for the lower inner member of dimensional accuracy.
If will be approximately 1 * 10
8The very high pressure of Pa is added in the resin material that is used for the injection moulding battery, will have following shortcoming, and promptly the battery owing to the metal die cavity inside is out of shape, and further adds the gap between macrocell and the metal die.In addition, also have another shortcoming, promptly resin material flows in the gap of new formation between battery and the metal die, has just increased many burrs after solidifying.
In addition, also have other problems, molten resin material can damage the battery in the housing, because for heat and pressure, battery may be flimsy inner member when battery in the metal die contacts under making high temperature.
Summary of the invention
The object of the present invention is to provide a kind of injection moulding process, when with the resin material inner member outer surface that partly dimensional accuracy in the plating mould is lower, this method can be made high quality of products by eliminating burr.
Injection moulding process of the present invention is implemented by the metal die that use has cavity, is placed in cavity inside regularly such as the inner member of battery etc., makes it partly coated with thermoplastic resin.Even the dimensional accuracy of inner member is lower, cause the inwall of cavity and the gap in a certain position formation 0.02mm to the 0.08mm scope between the inner member, also can avoid fusion thermoplastic resin flow to go into this gap, so that cause that the finished product of injection moulding forms undesirable burr.
Above-mentioned feature realizes by using the polyamide of viscosity in 1000mPas to 3000mPas scope, this resin can melt under the lower temperature in 190 ℃ to the 230 ℃ scopes, so that can under the low injection pressure in 0.3MPa to 0.6MPa scope the molten polyamide resin be injected in the cavity of metal die.
In other words, because the injection pressure that is added on the molten polyamide resin is lower, can prevent to form undesirable burr reliably, because the molten polyamide resin can flow in the gap of the above-mentioned width between cavity inner wall and the inner member hardly.In addition, because polyamide has better viscosity scope when fusion, can avoid the injection moulding fault that under lower injection pressure, takes place reliably.
As inner member, can use battery with battery unit, described battery is encapsulated in the aluminum enclosure of thin case or the formation of deep-draw aluminum.Battery can have lower rigidity, thereby easy deformation, and lower hear resistance.The present invention adopts low temperature and low injection pressure, therefore can be in metal die the injection moulding battery, and do not deform.Particularly, the present invention is for making such injection-molded item, and promptly the battery that is installed on the circuit board with the resin injection moulding is effective.
Description of drawings
Describe these and other purposes of the present invention, others and embodiment below with reference to the accompanying drawings in detail, wherein:
The decomposition diagram of the inner member that the battery in the cavity that Fig. 1 is expression with hollow space by metal die forms is corresponding;
Fig. 2 is metal die shown in Figure 1 is used in expression according to embodiments of the invention the formed cell module perspective view of injection moulding process;
Fig. 3 is a system diagram of representing component placement used in the injection moulding process of the present invention;
Fig. 4 is the longitdinal cross-section diagram that expression is inserted into the inner member in the metal die cavity shown in Figure 1;
Fig. 5 is the perspective view of another example of the expression inner member corresponding with battery, and described battery can bear injection moulding process of the present invention; And
Fig. 6 is expression applies the cell module that battery surface shown in Figure 5 makes by part a perspective view.
The specific embodiment
With way of example the present invention is described in more detail below with reference to accompanying drawing.
With reference now to Fig. 1 to 5, the injection moulding process of a kind of specific embodiment of the present invention is described.Reference number 1 expression metal die among Fig. 1, this mould vertically is divided into two parts, i.e. mold 1a and bed die 1b.These moulds 1a and 1b have hollow space 2a and 2b respectively, form the space of stipulating by these hollow spaces, so that place inner member under the situation of metal die 1 closure.As inner member, present embodiment uses circuit board 5, and this circuit board is used to install the battery 3 with thin case and connector 4.By injection moulding, circuit board 5 is partly applied as follows goes up resin material, and promptly the upper surface 3a of battery 3 and lower surface 3b expose, and make their neighboring area optionally be coated resin material.So, the cell module 6 shown in can shop drawings 2.
Can high dimension precision make circuit board 5 and its installation elements in the above.Yet battery 3 has thin case, is out of shape because of the external force that is applied thereto easily; Therefore, it can not be made and have high dimension precision.Under the state that metal die 1 clamps, the upper surface 3a of battery 3 is closely contacted with the hollow space 2a of metal die 1 and the inwall of 2b with lower surface 3b, when the pressure with regulation is added on the resin material that is injected in the metal die 1, between the inwall of the hollow space of the surface of battery 3 and metal die 1, form gap 9 (see figure 4)s that width is about 0.08mm along the thickness direction of battery 3.
In order to eliminate the gap 9 that forms between battery 3 and the metal die 1, can adopt the measure of regulation, wherein compare with the inside dimension of metal die 1, increase the size of battery 3 along thickness direction.Yet in such cases, battery 3 will be damaged, because may be owing to clamp metal die 1 along thickness direction compressing battery., usually metal die 1 is designed to for this reason, makes its inside dimension be set to consistent with the full-size of battery 3.This is because when battery 3 is placed on the hollow space 2a that clamps metal die 1 as shown in Figure 4 and the formed space of 2b, can form gap 9 in a certain position between battery 3 and metal die 1 inevitably, the cavity 8 that is used to guide from the resin material of opening 7 injections is departed from this gap.
The injection moulding process of present embodiment uses above-mentioned mould 1, utilizes the resin material of appointment, carries out injection moulding as polyamide.For example, in 190 ℃ to 210 ℃ specified for temperature ranges, polyamide is heated.In the time of in polyamide is heated to such temperature range, just thawing shows the molten resin characteristic, and its viscosity is greatly in 1400mPas to 2400mPas scope.
Specify in air pressure in 0.3MPa to the 0.4MPa scope such as use, " fusion " polyamide is injected in the cavity 8 of metal die 1.
The general introduction of present embodiment injection moulding process is described below with reference to accompanying drawing 3.At first, " P " puts into heating container 11 polyamide, and heater 10 has been installed in the heating container 11.Like this,, give polyamide P heating, so that molten resin is from mouth 12 outflows of heating container 11 by starting the heater 10 of heating container 11.
When molten resin is in the cavity 8 of the mouth 12 injection metal dies 1 of heating container 11, must prevent that the temperature of molten resin from descending.Also promptly when in the cavity 8 that molten resin is injected metal die 1, should remain under the steady temperature usually.For this reason, the front end that is preferably in mouth 12 is provided with heater 13.
In addition, utilize air source 16 to exert pressure for molten resin P, described air source 16 is communicated with the upper space 15 of the upper surface top of heating container 11 interior molten resin P, and described heating container 11 seals with air tight manner.Utilize air source 16, such as with the air pressure settings of upper space 15 in 0.3MPa to 0.4MPa scope.Utilize the cylinder 18 that is connected with air source 17, make metal die 1 clamped.Should be provided with the clamping pressure that cylinder 18 produces enough high,, withstand the injection pressure of molten resin P so that make metal die 1 remain on clamped condition.Also be about to clamping pressure and be arranged to injection pressure greater than molten resin P.
In the time period of appointment, molten polyamide resin P is injected in the cavity 8 that forms between mould 1, battery 3 and the circuit board 5 continuously.Finish after the injection, make one section official hour section of metal die 1 cooling, molten resin P is solidified in metal die 1.Like this, just can produce cell module 6.
The feature of present embodiment injection moulding process is under very low injection pressure, such as in 0.3MPa to 0.4MPa scope, molten resin P to be injected in the cavity 8 of metal die 1.Like this, even be formed with gap 9 and communicate, can prevent that also molten resin P from flowing into width and being about in the gap 9 of 0.08mmm with cavity 8 in the metal die 1.Therefore, the designated surface zone that only is arranged on the battery 3 in the cavity 8 of metal die 1 is coated with by selectivity and applies molten resin P.Like this, present embodiment has significant effect aspect the burr avoiding injection-molded finished neighboring area to form.
In addition, present embodiment is characterised in that and uses polyamide P that this resin can melt, and guarantees the viscosity scope that about 1000mPas to 3000mPas is enough simultaneously in 190 ℃ to 210 ℃ lower temperature range.Because present embodiment can guarantee that molten resin has enough flowabilities in the cavity 8 of metal die 1, therefore can avoid to arrive the injection moulding fault that the corner took place of cavity 8 because of molten resin.Utilize 190 ℃ to 210 ℃ lower temperature range, just can realize this significant effect.Therefore, present embodiment need not at high temperature battery 3 to be placed in the cavity 8, therefore can guarantee that battery 3 is complete.
Because it is lower than the injection pressure of traditional injection moulding that present embodiment can be reduced to the injection pressure of molten resin, just can avoid battery 3 in metal die 1 internal strain, can also prevent that the gap between metal die 1 and the battery 3 is unnecessarily extended.In other words, can eliminate because the molten resin that flows in the gap forms undesirable Burr Problem, described traditionally gap may be extended.
Describe present embodiment as follows, promptly a certain position formation width outside cavity 8 between metal die 1 and the battery 3 is 0.008mm to the maximum or is exactly the gap 9 of 0.008mm.Making under the littler situation in gap 9, may change the heating-up temperature of molten resin and its injection pressure, so that big or small corresponding with gap 9.
For example, the Breadth Maximum in gap 9 is 0.05mm or is exactly under the situation of 0.05mm that the heating-up temperature of molten resin is elevated to 210 ℃ to the 220 ℃ a certain temperature in the scope, and injection pressure also is elevated to a certain pressure in 0.4MPa to the 0.5MPa scope simultaneously.Under situation about further being reduced to such as the Breadth Maximum that makes gap 9 about 0.025mm, then the heating-up temperature of molten resin is elevated to 220 ℃ to 230 ℃ higher temperature scopes, and injection pressure also is elevated to 0.5MPa to 0.6MPa higher pressure range simultaneously.
By improving the temperature of molten resin, can reduce the viscosity of molten resin, improve its flowability simultaneously.By improving injection pressure, can improve the speed in the molten resin injection cavity 8, therefore can improve injection-molded finished manufacturability.Certainly, battery 3 is influenced by above-mentioned 230 ℃ of temperature and above-mentioned 0.6MPa injection pressure hardly.
Present embodiment uses polyamide as resin material, is used to use the injection moulding of metal die 1.Also can use other identical with the viscosity of molten condition polyamide basically resin materials of other viscositys to replace polyamide.
Present embodiment has been described the inner member example corresponding with cell module 3, and the cell package of described cell module is in thin case, and it is manufactured that this housing is difficult to high dimension precision.Certainly, the present invention also can be used for inner member other examples corresponding to battery 19, and the battery unit of said battery is encapsulated in the interior (see figure 5) of the box of making of deep-draw aluminum.Also promptly can be by partly and optionally applying the surface manufacturing cell module 20 as shown in Figure 6 of battery 19.
Usually, the dimensional accuracy of above-mentioned aluminium box type battery 19 is lower, so the size of its thickness direction is approximately changing about 0.08mm.As previously mentioned, it is consistent with the full-size of battery 19 metal die 1 to be designed to size.In this case, can form width between metal die 1 and battery 9 is 0.08mm or littler gap 9.According to the injection moulding process of the foregoing description, can inject molten resin in the cavity of metal die reliably, prevent that simultaneously molten resin from flowing in the so little gap.
Be described at battery 3 above, battery 3 is examples of inner member.Also can use other inner members to replace battery 3, the dimensional accuracy of these inner members is lower, and causing forming width in metal die is 0.01mm or bigger bigger comparatively speaking gap.If these inner members do not have and battery 3 similar problem, just can improve the temperature of molten resin aspect hear resistance.Also promptly can use the thermoplastic resin material of appointment, at high temperature show as a certain viscosity scope of 1000mPas to 3000mPas after the thawing.
As mentioned above, the present invention has multiple technologies feature and effect, is described below:
(1) injection moulding process of the present invention can avoid molten resin inflow width to be about in the gap of 0.08mm, and described gap is to form between inner member and metal die because the dimensional accuracy of inner member is lower.In addition, can realize injection moulding as follows, promptly all be filled up reliably with the resin of fusion cavity with metal die.So, can prevent injection-molded finished formation burr, therefore can reliably avoid producing the injection moulding fault.
(2) injection moulding process of the present invention such as having relatively low stiffness and stable on heating battery, has remarkable result for the inner member of appointment.Because this injection moulding process does not need high pressure in injection moulding and since battery in metal die in the injection moulding process without undergoing high pressure, therefore can being kept perfectly property.Such effect is for the battery of specified type, promptly be encapsulated in thin case or the housing made by the deep-draw aluminum in the battery highly significant that becomes.That is to say that the present invention need not the high pressure that causes battery container to be out of shape in injection moulding; Therefore, can prevent owing to battery is out of shape the gap enlargement that makes between battery and the metal die.In other words, can avoid forming undesirable burr, such burr can be produced by the molten resin in " expansion " gap that flows between battery and the metal die.
(3) specifically, injection moulding process of the present invention uses polyamide as thermoplastic resin, injects in the cavity of metal die.Therefore, can be implemented in and make the polyamide of molten condition have lower viscosity under the lower air pressure condition.In addition, polyamide melts does not need high temperature; Therefore, since battery in metal die in the injection moulding process without undergoing high temperature, so can keep its integrality.
Because the present invention can implement in several modes that do not break away from spirit of the present invention and inner characteristic; so these embodiment are illustrative; rather than it is restrictive; because scope of the present invention is limited by appended claims; rather than limit by the description of front; all fall into the claim scope with interior remodeling, perhaps fall into being equal to replacement and all will being included in the claimed scope in this scope.
Claims (6)
1. the injection moulding process in the cavity (8) that thermoplastic resin is injected metal die (1) is characterized in that, in turn includes the following steps:
Inner member is placed in the cavity of metal die, tolerance therebetween allows to form the gap (9) of width in 0.02mm to 0.08mm scope in a certain position between cavity inner wall and the inner member;
Under the temperature of appointment, melt thermoplastic resin (P), so that the melting viscosity in 1000mPas to the 3000mPas scope is provided; And
Under the injection pressure in 0.3MPa to 0.6MPa scope, the thermoplastic resin of fusion is injected in the cavity of metal die,
Wherein fill the cavity of metal die, so that partly apply the surface of inner member with thermoplastic resin with the thermoplastic resin of fusion.
2. injection moulding process according to claim 1 is characterized in that, described inner member is corresponding to the battery with battery unit (3), and described battery unit is encapsulated in the thin case.
3. injection moulding process according to claim 1 is characterized in that, inner member is corresponding to the battery with battery unit (19), and described battery unit is encapsulated in the housing that the deep-draw aluminum makes.
4. injection moulding process according to claim 1 is characterized in that, described assigned temperature is in 190 ℃ to 230 ℃ scopes.
5. injection moulding process according to claim 1 is characterized in that, sets described injection pressure and assigned temperature about the Breadth Maximum in described gap.
6. according to any one described injection moulding process in the claim 1 to 3, it is characterized in that described thermoplastic resin is a polyamide.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001058651 | 2001-03-02 | ||
| JP2001058651 | 2001-03-02 | ||
| JP2001074534A JP3585854B2 (en) | 2001-03-02 | 2001-03-15 | Injection molding method |
| JP2001074534 | 2001-03-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1373033A true CN1373033A (en) | 2002-10-09 |
| CN1185089C CN1185089C (en) | 2005-01-19 |
Family
ID=26610538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011447745A Expired - Lifetime CN1185089C (en) | 2001-03-02 | 2001-12-25 | Injection moulding process |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3585854B2 (en) |
| CN (1) | CN1185089C (en) |
| HU (1) | HU224001B1 (en) |
| MX (1) | MXPA02000808A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101366131B (en) * | 2007-05-17 | 2010-06-02 | 惠州市德赛电池有限公司 | Method for lithium battery injection molding encapsulation |
| CN1828984B (en) * | 2005-02-25 | 2010-12-15 | 古河电池株式会社 | Paste type plate manufacturing method and alkaline accumulator using same |
| CN102717477A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 6/PA6T alloy and metal insert |
| CN102717474A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 12 and metal insert |
| CN104282931A (en) * | 2013-07-02 | 2015-01-14 | 国家电网公司 | Plastic packaging method for power-battery equalization module and plastically-packaged power-battery equalization module |
| CN108819087A (en) * | 2018-04-20 | 2018-11-16 | 中山市高远精密模具有限公司 | A kind of manufacturing method of more part combination products and its body die of application |
| CN110734291A (en) * | 2019-10-31 | 2020-01-31 | 陕西博鼎快速精铸科技有限责任公司 | Processing method for ceramic mold injection molding of high-temperature-resistant polymer parts |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4702290B2 (en) * | 2001-06-28 | 2011-06-15 | パナソニック株式会社 | battery |
| JP4702289B2 (en) * | 2001-06-28 | 2011-06-15 | パナソニック株式会社 | battery |
| JP4534839B2 (en) * | 2005-03-30 | 2010-09-01 | 株式会社デンソー | Bolt fastening flange and manufacturing method thereof |
| FR2953755B1 (en) * | 2009-12-14 | 2012-01-20 | Rhodia Operations | PROCESS FOR MANUFACTURING COMPOSITE ARTICLES BASED ON POLYAMIDE |
| CN104175447A (en) * | 2014-08-07 | 2014-12-03 | 浙江锦盛包装有限公司 | Process for forming thick-wall transparent products |
| JP6600193B2 (en) * | 2015-08-24 | 2019-10-30 | 株式会社エンビジョンＡｅｓｃジャパン | Injection molding method and injection molding apparatus |
-
2001
- 2001-03-15 JP JP2001074534A patent/JP3585854B2/en not_active Expired - Lifetime
- 2001-12-25 CN CNB011447745A patent/CN1185089C/en not_active Expired - Lifetime
- 2001-12-28 HU HU0105492A patent/HU224001B1/en active IP Right Revival
-
2002
- 2002-01-23 MX MXPA02000808 patent/MXPA02000808A/en active IP Right Grant
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828984B (en) * | 2005-02-25 | 2010-12-15 | 古河电池株式会社 | Paste type plate manufacturing method and alkaline accumulator using same |
| CN101366131B (en) * | 2007-05-17 | 2010-06-02 | 惠州市德赛电池有限公司 | Method for lithium battery injection molding encapsulation |
| CN102717477A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 6/PA6T alloy and metal insert |
| CN102717474A (en) * | 2012-06-28 | 2012-10-10 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 12 and metal insert |
| CN102717474B (en) * | 2012-06-28 | 2015-06-03 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 12 and metal insert |
| CN102717477B (en) * | 2012-06-28 | 2015-06-03 | 金发科技股份有限公司 | Forming process for combining polylaurolactam (PA) 6/PA6T alloy and metal insert |
| CN104282931A (en) * | 2013-07-02 | 2015-01-14 | 国家电网公司 | Plastic packaging method for power-battery equalization module and plastically-packaged power-battery equalization module |
| CN108819087A (en) * | 2018-04-20 | 2018-11-16 | 中山市高远精密模具有限公司 | A kind of manufacturing method of more part combination products and its body die of application |
| CN110734291A (en) * | 2019-10-31 | 2020-01-31 | 陕西博鼎快速精铸科技有限责任公司 | Processing method for ceramic mold injection molding of high-temperature-resistant polymer parts |
Also Published As
| Publication number | Publication date |
|---|---|
| HUP0105492A3 (en) | 2004-08-30 |
| HUP0105492A2 (en) | 2002-09-28 |
| MXPA02000808A (en) | 2004-07-20 |
| CN1185089C (en) | 2005-01-19 |
| JP3585854B2 (en) | 2004-11-04 |
| JP2002326250A (en) | 2002-11-12 |
| HU0105492D0 (en) | 2002-02-28 |
| HU224001B1 (en) | 2005-04-28 |
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Granted publication date: 20050119 |