JP2008119889A - Mold injection-molding mold - Google Patents

Mold injection-molding mold Download PDF

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JP2008119889A
JP2008119889A JP2006304030A JP2006304030A JP2008119889A JP 2008119889 A JP2008119889 A JP 2008119889A JP 2006304030 A JP2006304030 A JP 2006304030A JP 2006304030 A JP2006304030 A JP 2006304030A JP 2008119889 A JP2008119889 A JP 2008119889A
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cavity
mold member
mold
movable mold
hole
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JP5006621B2 (en
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Isamu Okubo
勇 大久保
Toru Hirano
透 平野
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To easily extract air and resin gas from a cavity even when the size of a molding part is small in a mold injection-molding mold. <P>SOLUTION: In a first movable mold member wherein the cavity is formed, a first hole communicating with the cavity and a groove which is formed in a surface opposite to a surface wherein the cavity is formed and communicates with the first hole are formed. A second hole communicating with the groove is formed in a second movable mold member supporting the first movable mold member. Air and resin gas are extracted outside from the cavity through the first hole, the groove, and the second hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、モールド射出成形金型に係り、特に、成形品の精度を確保するために、成形部としてのキャビティ内から空気や樹脂ガスを抜くための技術に関する。   The present invention relates to a mold injection mold, and more particularly, to a technique for extracting air and resin gas from a cavity as a molded part in order to ensure the accuracy of a molded product.

モールド射出成形においては、空気や樹脂から発生するガス（以下、樹脂ガスという）がキャビティ内に留まっている場合には、樹脂がキャビティ内に十分に充填されず適切な成形が阻害され、成形品に不良を発生することが多い。このため、従来から、キャビティ内から空気や樹脂ガスを抜くことが行われている。従来技術の例を図３に示す。図３において、（ａ）は、成形部１１１に溜まった空気や樹脂ガスを、イジェクトピン１８とイジェクトピン挿入用の孔３０との間に形成される隙間から抜く構造であり、（ｂ）は、イレコ４０の表面に設けたエア溝から、成形部１１１に溜まった空気や樹脂ガスを抜く構造である。図中、１１'は可動金型部材、２１'は固定金型部材である。   In mold injection molding, when gas generated from air or resin (hereinafter referred to as resin gas) stays in the cavity, the resin is not sufficiently filled in the cavity and proper molding is hindered. In many cases, defects occur. For this reason, conventionally, air and resin gas are extracted from the cavity. An example of the prior art is shown in FIG. In FIG. 3, (a) is a structure in which air or resin gas accumulated in the molding part 111 is extracted from a gap formed between the eject pin 18 and the eject pin insertion hole 30, and (b) In this structure, the air and resin gas collected in the molding part 111 are removed from the air groove provided on the surface of the ileco 40. In the figure, 11 'is a movable mold member, and 21' is a fixed mold member.

また、本願発明に関連した従来技術であって、特許文献に記載されたものとしては、例えば、特開２００４−２９９０８５号公報（特許文献１）、特開２００４−２９９０９０号公報（特許文献２）及び特開平８−７２１０９号公報（特許文献３）に記載された技術がある。特開２００４−２９９０８５号公報及び特開２００４−２９９０９０号公報には、固定金型部材側に設けたキャビティ内のガスを、可動金型部材側に、金型面を成す成形体と対状にして設けた多孔質金属体の通気部から抜くとする構成が記載され、特開平８−７２１０９号公報には、キャビティ内の空気を吸引しながら、溶融樹脂をキャビティ内に充填した後、溶融樹脂が冷却固化しつつあるとき、キャビティ内の成形品の裏面側に圧縮流体を注入して、成形品の表面にひけが発生しないようにするとした構成が記載されている。   Moreover, as a prior art related to the invention of the present application and described in the patent document, for example, Japanese Patent Application Laid-Open No. 2004-299085 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2004-299090 (Patent Document 2). And a technique described in Japanese Patent Laid-Open No. 8-72109 (Patent Document 3). In JP-A-2004-299085 and JP-A-2004-299090, the gas in the cavity provided on the stationary mold member side is paired with the molded body forming the mold surface on the movable mold member side. In Japanese Patent Application Laid-Open No. 8-72109, after the molten resin is filled in the cavity while sucking the air in the cavity, the molten resin is disclosed. Describes a configuration in which a compressed fluid is injected into the back surface side of the molded product in the cavity so that sink marks do not occur on the surface of the molded product.

特開２００４−２９９０８５号公報JP 2004-299085 A 特開２００４−２９９０９０号公報JP 2004-299090 A 特開平８−７２１０９号公報JP-A-8-72109

上記図３に示す従来技術においては、成形部の寸法が小さい場合には、小寸法のイジェクトピン挿入用の孔やイレコを製造することが技術的に難しくなるため、容易にはこれに対応することができず、成形品の製造コストも増大し易い。また、特開２００４−２９９０８５号公報や特開２００４−２９９０９０号公報に記載の技術では、多孔質金属体の表面を、金型面を成す成形体で覆う構成のため、例えば成形品に細かいピッチの突起部がある場合には、該突起部に対応するキャビティ内のガスは抜くことが難しいと考えられる。
本発明の課題点は、上記従来技術の状況に鑑み、モールド射出成形金型において、成形部の寸法が小さい場合にも、キャビティ内から空気や樹脂ガスを容易に抜くことができるようにすることである。 In the prior art shown in FIG. 3, when the size of the molding part is small, it is technically difficult to manufacture a small-sized eject pin insertion hole or an irreco. It is difficult to increase the manufacturing cost of the molded product. In the technique described in Japanese Patent Application Laid-Open No. 2004-299085 and Japanese Patent Application Laid-Open No. 2004-299090, the surface of the porous metal body is covered with a molded body that forms a mold surface. If there is a protrusion, it is considered difficult to remove the gas in the cavity corresponding to the protrusion.
An object of the present invention is to make it possible to easily remove air and resin gas from a cavity even when the size of a molding part is small in a mold injection mold, in view of the above-described prior art. It is.

上記課題点を解決するために、本発明のモールド射出成形金型では、成形部としてのキャビティが設けられる第１の可動金型部材内に、該キャビティに連通した第１の孔と、該キャビティが形成された面とは反対側の面に形成され該第１の孔に連通する溝部とを設け、さらに、該第１の可動金型部材を支持する第２の可動金型部材に、上記溝部に連通する第２の孔を設けた構成とし、該第１の孔、該溝部及び該第２の孔を通して、上記キャビティ内から空気や樹脂ガスを外部に抜くことができる構成とする。   In order to solve the above-described problems, in the mold injection mold of the present invention, a first hole communicated with the cavity in the first movable mold member provided with a cavity as a molding part, and the cavity A groove formed on a surface opposite to the surface on which the first movable mold member is formed and communicated with the first hole, and a second movable mold member supporting the first movable mold member includes A configuration is provided in which a second hole communicating with the groove portion is provided, and air and resin gas can be extracted from the cavity through the first hole, the groove portion, and the second hole.

本発明によれば、モールド射出成形金型において、成形品の精度を確保し、成形不良を防止することができる。   According to the present invention, in a mold injection mold, the accuracy of a molded product can be ensured and molding defects can be prevented.

以下、本発明の実施例につき、図面を用いて説明する。
図１及び図２は、本発明の実施例の説明図である。図１は、実施例としてのモールド射出成形金型の全体構成を示す図、図２は、図１のモールド射出成形金型の要部構成を示す図である。
図１において、１００はモールド射出成形金型、１は可動金型部材、２は固定金型部材、Ｐは、可動金型部材１を固定金型部材２から分離させる分離面（パーティング）、１１は、成形部のキャビティを有する第１の可動金型部材、１２は、該第１の可動金型部材１１を支持する第２の可動金型部材、２１は、第１の可動金型部材１１に対向して配され、上記キャビティを覆って該第１の可動金型部材１１とともに成形部を形成する第１の固定金型部材、２２は、該第１の固定金型部材２１を支持する第２の固定金型部材、１３は、第２の可動金型部材１２を所定の高さ位置に支持するスペーサブロック、１４は、可動金型部材１を射出成形機に取付ける可動側取付け板、１５は、成形品を成形部から突き出すためのイジェクトピン、１６、１７は、イジェクトピン１５を支持するイジェクタプレート、２３は、ランナープレート、２４は固定側取付け板、２５は、供給された溶融樹脂を金型内へ導くスプルーブシュ、２６は、成形機（図示なし）に対しモールド射出成形金型１００を位置決めするためのロケートリングである。 Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are explanatory views of an embodiment of the present invention. FIG. 1 is a diagram illustrating an overall configuration of a mold injection mold as an embodiment, and FIG. 2 is a diagram illustrating a main configuration of the mold injection mold of FIG.
In FIG. 1, 100 is a mold injection mold, 1 is a movable mold member, 2 is a fixed mold member, P is a separation surface (parting) for separating the movable mold member 1 from the fixed mold member 2, 11 is a first movable mold member having a cavity of a molding part, 12 is a second movable mold member that supports the first movable mold member 11, and 21 is a first movable mold member. 11, a first fixed mold member 22 that forms a molding portion together with the first movable mold member 11 so as to cover the cavity and support the first fixed mold member 21 A second fixed mold member 13, a spacer block 13 for supporting the second movable mold member 12 at a predetermined height position, and a movable side mounting plate 14 for mounting the movable mold member 1 on the injection molding machine. , 15 is an eject pin for projecting the molded product from the molded part, 16, 7 is an ejector plate that supports the eject pin 15, 23 is a runner plate, 24 is a fixed side mounting plate, 25 is a sprue bush that guides the supplied molten resin into the mold, and 26 is a molding machine (not shown) ) Is a locating ring for positioning the mold injection mold 100.

また、１１１は、第１の可動金型部材１１に形成される成形部としてのキャビティ、１１２は、第１の可動金型部材１１に形成され、キャビティ１１１に連通して設けられた第１の孔としての微細孔、１１３は、同じく第１の可動金型部材１１に形成され、微細孔１１２に連続する同じく第１の孔としてのエア孔、１１４は、第１の可動金型部材１１上において、キャビティ１１１が形成された面とは反対側の面に形成され該エア孔１１３に連通する溝部、１１５は、第２の可動金型部材１１２に形成され、溝部１１４に連通する第２の孔、１１６はエアチューブ、１１７は、第２の孔１１５とエアチューブ１１６とをつなぐ継手、２１１は、スプルーブシュ２５内にあって溶融樹脂の流入路を形成する１次スプルー部、２１２は、第２の固定金型部材２２内及び第１の固定金型部材２１内に連続状に形成され溶融樹脂のキャビティ１１１への流入路を形成する２次スプルー部、２１３は、１次スプルー部２１１から２次スプルー部２１２に溶融樹脂を流すランナー部、５０はコンプレッサ、Ｓはイジェクトストロークである。キャビティ１１１内に溶融樹脂が充填され固化されることで成形品が製造される。エアチューブ１１６はコンプレッサ５０に接続されている。
射出成形機は、上記モールド射出成形金型１００と、樹脂を溶融させ該溶融樹脂を該モールド射出成形金型１００に供給する樹脂供給部（図示なし）と、上記コンプレッサ５０と、これらを制御する制御部（図示なし）とを備えて構成されるものとする。 Reference numeral 111 denotes a cavity as a molding portion formed in the first movable mold member 11, and 112 denotes a first formed in the first movable mold member 11 and provided in communication with the cavity 111. A fine hole 113 as a hole is also formed in the first movable mold member 11, and an air hole 114 as a first hole that is continuous with the fine hole 112 is formed on the first movable mold member 11. , The groove portion 115 formed on the surface opposite to the surface on which the cavity 111 is formed and communicated with the air hole 113 is formed in the second movable mold member 112 and communicated with the groove portion 114. Hole, 116 is an air tube, 117 is a joint connecting the second hole 115 and the air tube 116, 211 is a primary sprue part in the sprue bush 25 that forms an inflow path for molten resin, 212 is Second solid The secondary sprue part 213 is formed continuously in the mold member 22 and the first fixed mold member 21 and forms an inflow path to the cavity 111 of the molten resin. The secondary sprue part 213 extends from the primary sprue part 211 to the secondary sprue part. A runner section for flowing molten resin to the section 212, 50 is a compressor, and S is an eject stroke. A molded product is manufactured by filling the cavity 111 with a molten resin and solidifying it. The air tube 116 is connected to the compressor 50.
The injection molding machine controls the mold injection mold 100, a resin supply unit (not shown) that melts the resin and supplies the molten resin to the mold injection mold 100, the compressor 50, and the like. A control unit (not shown) is provided.

図２は、図１のＡ部の拡大図である。
第１の可動金型部材１１に形成される成形部としてのキャビティ１１１は、成形品が表面に複数の凸部を有する形状の場合、該複数の凸部に対応し共通の第１の凹部１１１ａ内にさらに複数の第２の凹部１１１ｂを有し、該第２の凹部１１１ｂのそれぞれに連通して複数の微細孔（第１の孔）と複数のエア孔１１３が設けられ、溝部１１４は、該複数のエア孔１１３に共通して連通するようになっている。本実施例の場合、隣接する第２の凹部１１１ｂ相互間の間隔は例えば２×１０−３ｍ以下、微細孔１１２の直径は例えば０．０５×１０−３ｍ〜０．１×１０−３ｍ程度、長さは例えば３×１０−３ｍ〜５×１０−３ｍ程度とする。 FIG. 2 is an enlarged view of a portion A in FIG.
When the molded product has a shape having a plurality of projections on the surface, the cavity 111 as a molding portion formed in the first movable mold member 11 corresponds to the plurality of projections and is a common first recess 111a. A plurality of second recesses 111b are further provided therein, and a plurality of fine holes (first holes) and a plurality of air holes 113 are provided in communication with each of the second recesses 111b. The plurality of air holes 113 communicate with each other in common. In the case of the present embodiment, the interval between the adjacent second recesses 111b is, for example, 2 × 10 −3 m or less, and the diameter of the fine hole 112 is, for example, 0.05 × 10 −3 m to 0.1 × 10 −3. For example, the length is about 3 × 10 −3 m to 5 × 10 −3 m.

上記図１、図２の構成において、成形時、樹脂供給部（図示なし）から溶融樹脂がスプルーブシュ２５内の１次スプルー部２１１に供給されると、該溶融樹脂は、ランナー部２１３、２次スプルー部２１２を通ってキャビティ１１１内に入り、充填される。このとき、キャビティ１１１内の空気や溶融樹脂から発生する樹脂ガスは、微細孔１１２、エア孔１１３、溝部１１４、第２の孔１１５、継手１１７、エアチューブ１１６を経て、外部に放出される。これによって、溶融樹脂のキャビティ１１１内への十分な充填が確保される。また、キャビティ１１１内への溶融樹脂の充填が完了する直前に、第２の孔１１５に圧縮空気を流し込んで溝部１１４、エア孔１１３に圧縮空気を送り、微細孔１１２内の空気圧を増大させて、該微細孔１１２内に溶融樹脂が流れ込んでバリが生ずるのを防ぐ。キャビティ１１１内に充填された溶融樹脂は、その後加熱処理等をされて硬化し固化状態となる。その後、可動金型部材１が−Ｚ軸方向に移動され、分離面Ｐで固定金型部材２から分離される。このとき、第１の固定金型部材２１の内部の２次スプルー部２１２にある固化状態の樹脂部の先端部は、第１の可動金型部材１１のキャビティ１１１内にある固化状態の樹脂部の表面から引きちぎられる。可動金型部材１は−Ｚ軸方向に所定距離移動した位置で移動を停止される。該位置で、イジェクタプレート１６、１７が、Ｚ軸方向に移動され、イジェクトピン１５をＺ軸方向にイジェクトストロークＳの距離だけ押し上げる。該押し上げられることでイジェクトピン１５の先端は、キャビティ１１１内にある固化状態の樹脂部の裏面側を押し、該樹脂部をキャビティ１１１の内面から離間させるすなわち該樹脂部である成形品を第１の可動金型部材１１から離型させる。離型された成形品はモールド射出成形金型１００の外部に取り出される。このようにして、モールド射出成形金型１００により成形品が製造される。   1 and 2, when molten resin is supplied from a resin supply unit (not shown) to the primary sprue portion 211 in the sprue bush 25 during molding, the molten resin is supplied to the runner portions 213, 2 and 2. It enters the cavity 111 through the next sprue 212 and is filled. At this time, the resin gas generated from the air or molten resin in the cavity 111 is discharged to the outside through the fine holes 112, the air holes 113, the grooves 114, the second holes 115, the joints 117, and the air tubes 116. This ensures sufficient filling of the molten resin into the cavity 111. Also, immediately before the filling of the molten resin into the cavity 111 is completed, compressed air is poured into the second hole 115 and the compressed air is sent to the groove 114 and the air hole 113 to increase the air pressure in the fine hole 112. , It prevents the molten resin from flowing into the fine holes 112 to generate burrs. The molten resin filled in the cavity 111 is then subjected to a heat treatment or the like to be cured and solidified. Thereafter, the movable mold member 1 is moved in the −Z-axis direction and separated from the fixed mold member 2 on the separation surface P. At this time, the front end portion of the solidified resin portion in the secondary sprue portion 212 inside the first fixed mold member 21 is the solidified resin portion in the cavity 111 of the first movable mold member 11. Torn from the surface of the. The movable mold member 1 stops moving at a position moved a predetermined distance in the −Z axis direction. At this position, the ejector plates 16 and 17 are moved in the Z-axis direction to push up the eject pin 15 by the distance of the eject stroke S in the Z-axis direction. By being pushed up, the tip of the eject pin 15 pushes the back side of the solidified resin part in the cavity 111 to separate the resin part from the inner surface of the cavity 111, that is, the molded product that is the resin part is the first. The mold is released from the movable mold member 11. The released molded product is taken out of the mold injection mold 100. In this way, a molded product is manufactured by the mold injection mold 100.

上記説明した本発明の実施例のモールド射出成形金型１００によれば、成形時、キャビティ１１１内から空気や樹脂ガスを外部に抜くことができ、該空気や樹脂ガスに起因する成形不良を排除して成形品の精度を確保することができる。また、微細孔１１２内の空気圧を増大させることで該微細孔１１２に起因するバリの発生が抑えられ、この点からも成形品の精度を確保し易くなる。   According to the mold injection mold 100 of the embodiment of the present invention described above, air or resin gas can be extracted from the cavity 111 to the outside during molding, and molding defects caused by the air or resin gas are eliminated. Thus, the accuracy of the molded product can be ensured. Further, by increasing the air pressure in the fine holes 112, the generation of burrs due to the fine holes 112 is suppressed, and from this point, it is easy to ensure the accuracy of the molded product.

本発明の実施例としてのモールド射出成形金型の構造図である。1 is a structural diagram of a mold injection mold as an embodiment of the present invention. 図１のモールド射出成形金型の要部説明図である。It is principal part explanatory drawing of the mold injection molding metal mold | die of FIG. 従来技術の説明図である。It is explanatory drawing of a prior art.

符号の説明Explanation of symbols

１００…モールド射出成形金型、
１…可動金型部材、
２…固定金型部材、
１１…第１の可動金型部材、
１２…第２の可動金型部材、
２１…第１の固定金型部材、
２２…第２の固定金型部材、
１３…スペーサブロック、
１４…可動側取付け板、
１５…イジェクトピン、
１６、１７…イジェクタプレート、
２３…ランナープレート、
２４…固定側取付け板、
２５…スプルーブシュ、
２６…ロケートリング、
１１１…キャビティ、
１１２…微細孔、
１１３…エア孔、
１１４…溝部、
１１５…第２の孔、
１１６…エアチューブ、
１１７…継手、
２１１…１次スプルー部、
２１２…２次スプルー部、
２１３…ランナー部、
５０…コンプレッサ。 100: mold injection mold,
1 ... movable mold member,
2 ... Fixed mold member,
11: First movable mold member,
12 ... Second movable mold member,
21: First fixed mold member,
22 ... Second stationary mold member,
13: Spacer block,
14 ... Moving side mounting plate,
15 ... eject pin,
16, 17 ... ejector plate,
23 ... Runner plate,
24 ... Fixed side mounting plate,
25 ... sprue bushes,
26 ... Locate ring,
111 ... cavity,
112 ... micropores,
113 ... Air hole,
114 ... groove,
115 ... second hole,
116: air tube,
117 ... Fitting,
211 ... Primary sprue part,
212 ... Secondary sprue part,
213 ... Runner part,
50 ... Compressor.

Claims (3)

可動金型と固定金型との間にキャビティを形成し該キャビティに充填される樹脂を成形するモールド射出成形金型であって、
成形部としてのキャビティと、該キャビティに連通した第１の孔と、上記キャビティが形成された面とは反対側の面に形成され該第１の孔に連通する溝部とが形成された第１の可動金型部材と、
上記第１の可動金型部材を支持し、上記溝部を覆い、かつ該溝部に連通する第２の孔を有する第２の可動金型部材と、
上記第１の可動金型部材に対向して配され、上記キャビティを覆って該第１の可動金型部材とともに成形部を形成するとともに、該成形部に連通し該成形部に溶融した樹脂を供給する第１のスプルー部が設けられた第１の固定金型部材と、
上記第１の固定金型部材を支持し、上記第１のスプルー部に連通し該第１のスプルー部に溶融した樹脂を供給する第２のスプルー部が設けられた第２の固定金型部材と、
を備え、上記キャビティ内の空気または樹脂ガスを、上記第１の孔、上記溝部、上記第２の孔を経て外部に抜く構成としたことを特徴とするモールド射出成形金型。 A mold injection mold for forming a cavity between a movable mold and a fixed mold and molding a resin filled in the cavity,
A cavity as a molding part, a first hole communicating with the cavity, and a groove formed on a surface opposite to the surface where the cavity is formed and communicating with the first hole are formed. A movable mold member of
A second movable mold member that supports the first movable mold member, covers the groove, and has a second hole communicating with the groove;
The first movable mold member is arranged to face the first movable mold member so as to cover the cavity and form a molded portion together with the first movable mold member. A first fixed mold member provided with a first sprue portion to be supplied;
A second fixed mold member provided with a second sprue portion that supports the first fixed mold member and communicates with the first sprue portion and supplies molten resin to the first sprue portion. When,
And a mold injection mold characterized in that air or resin gas in the cavity is extracted outside through the first hole, the groove, and the second hole. 上記第１の可動金型部材は、上記キャビティが、成形品表面の複数の凸部に対応し共通の第１の凹部内にさらに複数の第２の凹部を有し、さらに、該第２の凹部のそれぞれに連通した複数の第１の孔と、該複数の第１の孔に共通的に連通する溝部とが形成された構成である請求項１に記載のモールド射出成形金型。   In the first movable mold member, the cavity has a plurality of second recesses in a common first recess corresponding to the plurality of projections on the surface of the molded product, and the second movable mold member 2. The mold injection mold according to claim 1, wherein a plurality of first holes communicated with each of the concave portions and a groove portion commonly communicated with the plurality of first holes are formed. 上記第１の可動金型部材は、キャビティの平面領域内に、イジェクトピン挿入用の孔が、該キャビティに連通状態で設けられた構成である請求項１に記載のモールド射出成形金型。   2. The mold injection mold according to claim 1, wherein the first movable mold member has a structure in which a hole for inserting an eject pin is provided in communication with the cavity in a planar region of the cavity.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105904646A (en) * 2016-04-08 2016-08-31 天津大学 Cavity gas pressure dynamic control-based micro injection molding apparatus and method thereof
KR101759307B1 (en) 2014-05-07 2017-07-25 주식회사 오리지널복합소재 Mould for forming fiber-reinforced composite material easying gas emissions

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03202333A (en) * 1989-02-28 1991-09-04 Citizen Watch Co Ltd Injection molding device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03202333A (en) * 1989-02-28 1991-09-04 Citizen Watch Co Ltd Injection molding device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101759307B1 (en) 2014-05-07 2017-07-25 주식회사 오리지널복합소재 Mould for forming fiber-reinforced composite material easying gas emissions
CN105904646A (en) * 2016-04-08 2016-08-31 天津大学 Cavity gas pressure dynamic control-based micro injection molding apparatus and method thereof

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