JP6322018B2 - Injection mold and method of manufacturing resin molded product using the same - Google Patents
Injection mold and method of manufacturing resin molded product using the same Download PDFInfo
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- JP6322018B2 JP6322018B2 JP2014062982A JP2014062982A JP6322018B2 JP 6322018 B2 JP6322018 B2 JP 6322018B2 JP 2014062982 A JP2014062982 A JP 2014062982A JP 2014062982 A JP2014062982 A JP 2014062982A JP 6322018 B2 JP6322018 B2 JP 6322018B2
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- 239000011347 resin Substances 0.000 title claims description 88
- 229920005989 resin Polymers 0.000 title claims description 88
- 238000002347 injection Methods 0.000 title claims description 26
- 239000007924 injection Substances 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000465 moulding Methods 0.000 claims description 51
- 238000013461 design Methods 0.000 description 15
- 238000001746 injection moulding Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 11
- 230000002087 whitening effect Effects 0.000 description 7
- 230000008602 contraction Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- Moulds For Moulding Plastics Or The Like (AREA)
Description
本発明は、固定金型と可動金型とで形成されるキャビティ内に溶融した樹脂を射出し、固化させることで樹脂成形品を成形する射出成形用金型及びそれを用いた樹脂成形品の製造方法に関する。 The present invention relates to an injection mold for molding a resin molded product by injecting molten resin into a cavity formed by a fixed mold and a movable mold and solidifying the resin, and a resin molded product using the mold. It relates to a manufacturing method.
自動車内部品のインスツルメント・パネル（instrument panel 以下、「インパネ」と略称する。）のような樹脂製品を成形する成形技術として、固定金型と可動金型とで形成されるキャビティ内に溶融した樹脂を射出し、固化させることで樹脂製品を生成する射出成形法が広く用いられている。 As a molding technology for molding resin products such as instrument panels (hereinafter referred to as “instrument panels”) for automotive interior parts, melting is performed in a cavity formed by a fixed mold and a movable mold. An injection molding method in which a resin product is produced by injecting and solidifying a resin is widely used.
射出成形法では、成形品にアンダーカット部がある場合、スライド機構を用いることが一般的であるが、樹脂の固化に伴う熱収縮により成形品のアンダーカット部が白化することがある。 In the injection molding method, when the molded product has an undercut portion, a slide mechanism is generally used. However, the undercut portion of the molded product may be whitened due to thermal contraction accompanying the solidification of the resin.
従来、上記の成形品のアンダーカット部の白化を防止する方法として、例えば、特開２００９−１０１６４０号公報に、アンダーカット部を成形するための入れ子を可動部と支持部とで構成し、可動部を樹脂の熱収縮に応じて可動させる方法が提案されている。 Conventionally, as a method for preventing whitening of the undercut portion of the above-mentioned molded product, for example, in Japanese Patent Application Laid-Open No. 2009-101640, a nest for forming the undercut portion is configured by a movable portion and a support portion, and is movable. There has been proposed a method of moving the portion in accordance with the thermal contraction of the resin.
ところで、樹脂成形品には、例えば、自動車内部品のインパネのように、意匠面にシボが設けられる成形品がある。自動車内部品のインパネを射出成形法で成形する場合、シボは微細な凹凸であるため、インパネの意匠面がアンダーカット部となる。このため、型開き動作や射出成形中の樹脂流動に起因して、シボの部分に圧力が掛かり、インパネの意匠面に白化やカジリが発生することがある。 By the way, the resin molded product includes, for example, a molded product in which a texture is provided on a design surface, such as an instrument panel of a car interior part. When the instrument panel of an automobile interior part is molded by an injection molding method, the design surface of the instrument panel becomes an undercut part because the texture is a fine unevenness. For this reason, pressure is applied to the embossed part due to the mold opening operation or the resin flow during the injection molding, and whitening or galling may occur on the design surface of the instrument panel.
この問題に対し、スライド機構によって対策することが考えられるが、個々のシボに対応してスライド機構を設けることは不可能で、製品形状やシボパターンに制約を設けることで対策するのが現状となっている。このため、インパネの設計の自由度が低いという問題がある。 Although it is conceivable to take measures against this problem by using a slide mechanism, it is impossible to provide a slide mechanism corresponding to each grain, and it is currently possible to take measures by setting restrictions on the product shape and grain pattern. It has become. For this reason, there exists a problem that the freedom degree of design of an instrument panel is low.
本発明は、上記の課題に鑑みてなされたものであって、樹脂成形品の白化やカジリの発生を抑制することができる射出成形用金型及びそれを用いた樹脂成形品の製造方法を提供することを目的とする。 The present invention has been made in view of the above problems, and provides an injection mold that can suppress the whitening and galling of a resin molded product, and a method for producing a resin molded product using the same. The purpose is to do.
本発明の第１の側面で提供される射出成形用金型は、微細な凹凸が形成された成形面を有する第１の金型と、当該第１の金型に型締めされて樹脂成形品の形状を有するキャビティを形成する第２の金型とを備え、前記キャビティ内に溶融した樹脂を射出し、固化させることで前記樹脂成形品を成形する射出成形用金型において、前記キャビティに射出された樹脂と前記成形面との間にエアを供給するエア供給手段を備えたことを特徴とする（請求項１）。 An injection mold provided in the first aspect of the present invention includes a first mold having a molding surface on which fine irregularities are formed, and a resin molded product that is clamped to the first mold. A second mold for forming a cavity having a shape of the above, and injecting molten resin into the cavity and solidifying the resin molded product by injection, and injecting the resin into the cavity An air supply means for supplying air between the formed resin and the molding surface is provided (claim 1).
好ましい実施形態によれば、前記エア供給手段は、前記第１の金型の成形面に設けられた前記エアの吹出口と、その吹出口に連通する連通路と、その連通路にエアを供給するエア供給部と、を含む構成にするとよい（請求項２）。 According to a preferred embodiment, the air supply means supplies the air to the air passage, the communication passage communicating with the air outlet, the air passage provided on the molding surface of the first mold, and the communication passage. And an air supply unit to be configured (claim 2).
また、前記エアの吹出口と前記連通路は、前記第１の金型の成形面に入れ子を設けることによって形成されるとよい（請求項３）。 The air outlet and the communication passage may be formed by providing a nest on the molding surface of the first mold.
本発明の第２の側面で提供される樹脂成形品の製造方法は、微細な凹凸が形成された成形面を有し、その成形面の一部にエアの吹出口が設けられた第１の金型と、当該第１の金型に型締めされて樹脂成形品の形状を有するキャビティを形成する第２の金型と、前記第１の金型の前記エアの吹出口から前記キャビティにエアを供給するエア供給手段とを備えた射出成形用金型による樹脂成形品の製造方法であって、前記キャビティ内に溶融した樹脂を射出し、当該樹脂が前記吹出口を通過した後の所定のタイミングで前記エア供給手段により前記吹出口を介して前記キャビティ内にエアを供給することを特徴とする（請求項４）。 The method for producing a resin molded product provided in the second aspect of the present invention has a molding surface on which fine irregularities are formed, and a first part in which an air outlet is provided on a part of the molding surface. A mold, a second mold that is clamped to the first mold to form a cavity having the shape of a resin molded product, and air from the air outlet of the first mold to the cavity. A method for producing a resin molded article using an injection mold having an air supply means for supplying a molten resin, wherein a predetermined amount of resin after the molten resin is injected into the cavity and the resin passes through the outlet The air is supplied into the cavity through the air outlet by the air supply means at a timing (Claim 4).
請求項１，４に記載の発明によれば、第１の金型と第２の金型とで形成されるキャビティ内に溶融した樹脂を射出し、固化させる際、当該樹脂と第１の金型の成形面との間にエアを供給するので、そのエアの層によって、第１の金型の成形面と密着することを防止することができる。これにより、金型の型開きをする際に固化した樹脂が第１の金型の成形面に形成された微細な凸凹部分と擦れて樹脂成形品の表面（微細な凸凹の意匠が施される面）に白化やカジリが生じるのを防止することができる。 According to the first and fourth aspects of the invention, when the molten resin is injected into the cavity formed by the first mold and the second mold and solidified, the resin and the first mold Since air is supplied to the molding surface of the mold, it is possible to prevent the air layer from coming into close contact with the molding surface of the first mold. As a result, the resin solidified when the mold is opened is rubbed against the minute convex and concave portions formed on the molding surface of the first mold, and the surface of the resin molded product (the design of fine irregularities is applied. It is possible to prevent whitening and galling on the surface.
また、請求項２に記載の発明によれば、第１の金型の成形面に設けられるキャビティへのエアの吹出口を微小サイズに設定することで、キャビティ内に射出された樹脂が吹出口から連通路側に進入し、それによって成形不良となることを防止することができる。 According to the second aspect of the present invention, the air injected into the cavity provided on the molding surface of the first mold is set to a very small size so that the resin injected into the cavity is discharged from the outlet. Can be prevented from entering into the communication path side, thereby causing molding defects.
また、請求項３に記載の発明によれば、入れ子を用いて射出成形用金型にエアの供給路を設けることができるので、射出成形用金型への通常の加工で容易に白化やカジリの発生を防止することができる。 According to the third aspect of the present invention, since the air supply path can be provided in the injection mold using the insert, whitening and galling can be easily performed by normal processing of the injection mold. Can be prevented.
本発明の好ましい実施の形態を、添付図面を参照して具体的に説明する。 A preferred embodiment of the present invention will be specifically described with reference to the accompanying drawings.
図１は、本発明に係る射出成形用金型の一例を示す図で、射出成形用金型が型締めされた状態を示す断面図である。図２は、射出成形用金型で成形される樹脂成形品を示す斜視図である。なお、図２に示す樹脂成形品の形状は、説明の便宜上、簡単な仮想の形状としている。 FIG. 1 is a view showing an example of an injection mold according to the present invention, and is a cross-sectional view showing a state where the injection mold is clamped. FIG. 2 is a perspective view showing a resin molded product molded with an injection mold. The shape of the resin molded product shown in FIG. 2 is a simple virtual shape for convenience of explanation.
射出成形用金型１（以下、単に「金型１」という。）は、固定金型２と、この固定金型２に型締めされて樹脂成形品５（図２参照）と同一形状のキャビティ４を有する金型を構成する可動金型３とで構成される。 An injection mold 1 (hereinafter simply referred to as “mold 1”) includes a fixed mold 2 and a cavity having the same shape as that of a resin molded product 5 (see FIG. 2), which is clamped to the fixed mold 2. And a movable mold 3 constituting a mold having four.
固定金型２は、キャビティ４内に溶融した樹脂を射出する射出成形機（図示省略）に固定される金型であり、固定金型本体２１と入れ子２２で構成されている。固定金型本体２１の内部には、射出成形機のノズル６から射出される溶融した樹脂Ｒ（図３参照）をキャビティ４に供給するためのスプルー２１１が穿設されている。また、固定金型２の内面には、スプルー２１１に連設された成形品表側成形面２１２が形成されている。 The fixed mold 2 is a mold that is fixed to an injection molding machine (not shown) that injects molten resin into the cavity 4, and includes a fixed mold main body 21 and a nest 22. A sprue 211 for supplying molten resin R (see FIG. 3) injected from the nozzle 6 of the injection molding machine to the cavity 4 is formed in the fixed mold body 21. Further, on the inner surface of the fixed mold 2, a molded product front side molding surface 212 connected to the sprue 211 is formed.
成形品表側成形面２１２は、図２に示すように、樹脂成形品５の表面のうち、意匠を施す面を成形する面である。本実施形態では、樹脂成形品５の「く」の字形の表面のうち、上側の表面５１（以下、「意匠面５１」という。）にシボ（シワ模様）を形成するため、成形品表側成形面２１２にシボ形成用の微細な凹凸２１２ａが設けられている。入れ子２２は、キャビティ４に溶融した樹脂Ｒが供給された後、当該樹脂Ｒが固化する際に当該樹脂Ｒと成形品表側成形面２１２の間にエアを供給するエア供給路２３を固定金型本体２１内に形成するためのものである。 As shown in FIG. 2, the molded product front side molding surface 212 is a surface on which a surface to which a design is applied is molded out of the surface of the resin molded product 5. In the present embodiment, a wrinkle pattern is formed on the upper surface 51 (hereinafter referred to as “design surface 51”) of the “<”-shaped surfaces of the resin molded product 5. The surface 212 is provided with fine irregularities 212a for embossing. The insert 22 has an air supply path 23 for supplying air between the resin R and the molded product front side molding surface 212 when the resin R solidifies after the molten resin R is supplied to the cavity 4. It is for forming in the main body 21.
射出成形時にキャビティ４内にエアを供給するのは、樹脂Ｒが固化するときに当該樹脂Ｒと成形品表側成形面２１２の間にエアの層を形成して当該樹脂Ｒが成形品表側成形面２１２に密着しないようにするためである。エアの層を形成することの作用・効果については後述する。 Air is supplied into the cavity 4 at the time of injection molding because, when the resin R is solidified, an air layer is formed between the resin R and the molded product surface side molding surface 212 so that the resin R becomes the molded product surface side molding surface. This is to avoid contact with 212. The operation and effect of forming the air layer will be described later.
エア供給路２３は、エアコンプレッサー８に接続される連通路２３１と、キャビティ４内にエアを吹き出すエア吹出口２３２とで構成される。エア吹出口２３２は、成形品表側成形面２１２の適所に設けられている。図１の例では、上側の傾斜した成形品表側成形面２１２の中央部に設けられている。従って、固定金型本体２１内の、成形品表側成形面２１２のエア吹出口２３２を形成する部分に入れ子２２が設けられている。 The air supply path 23 includes a communication path 231 connected to the air compressor 8 and an air outlet 232 that blows air into the cavity 4. The air outlet 232 is provided at an appropriate position on the molded product front side molding surface 212. In the example of FIG. 1, it is provided at the center portion of the upper inclined molded product surface side molding surface 212. Therefore, the insert 22 is provided in a portion of the fixed mold body 21 where the air outlet 232 of the molded product front side molding surface 212 is formed.
入れ子２２は、直方体形状を有し、キャビティ４に臨む傾斜した面（以下、「シボ形成面」という。）には固定金型本体２１の成形品表側成形面２１２と同様のシボ形成用の微細な凹凸２１２ａが設けられている。入れ子２２は、シボ形成面を固定金型本体２１の成形品表側成形面２１２に合わせて固定金型本体２１に固定されている。 The insert 22 has a rectangular parallelepiped shape, and an inclined surface facing the cavity 4 (hereinafter referred to as a “texture forming surface”) has a fine texture for forming a texture similar to that of the molded product front side molding surface 212 of the fixed mold body 21. An uneven surface 212a is provided. The insert 22 is fixed to the fixed mold body 21 with the embossed surface aligned with the molded product surface side molding surface 212 of the fixed mold body 21.
エア吹出口２３２は、連通路２３１よりも間隔を狭くするように、入れ子２２のシボ形成面側の端部に段差２３２ａを設けることによって形成されている。エア吹出口２３２の間隔を連通路２３１の間隔よりも狭くしているのは、キャビティ４内に供給された樹脂Ｒが連通路２３１側に進入して固化したときに不要なバリになることを防止するためである。従って、エア吹出口２３２のサイズは、スプルー２１１からキャビティ４内に押し出された樹脂Ｒがエア吹出口２３２から連通路２３１側に進入できないサイズ（例えば、０．０５ｍｍよりも狭いサイズ）に設定されている。 The air outlet 232 is formed by providing a step 232a at the end of the insert 22 on the side where the embossing surface is formed so that the interval is narrower than the communication passage 231. The reason why the interval between the air outlets 232 is narrower than the interval between the communication passages 231 is that the resin R supplied into the cavity 4 enters the communication passage 231 side and solidifies when unnecessary. This is to prevent it. Accordingly, the size of the air outlet 232 is set to a size (for example, a size smaller than 0.05 mm) in which the resin R extruded into the cavity 4 from the sprue 211 cannot enter the communication passage 231 side from the air outlet 232. ing.
次に、図３〜図６を用いて、本発明に係る射出成形用金型を用いた射出成形の作用と効果について、説明する。 Next, the operation and effect of injection molding using the injection mold according to the present invention will be described with reference to FIGS.
図３は、金型１のキャビティ４内への溶融した樹脂Ｒの射出を開始したときの状態を示す図、図４は、金型１のキャビティ４内にエアを供給するときの状態を示す図である。図５は、キャビティ４内に供給されたエアにより樹脂Ｒと成形品表側成形面２１２の間にエアの層が形成された状態を示す図である。 FIG. 3 is a diagram showing a state when injection of molten resin R into the cavity 4 of the mold 1 is started, and FIG. 4 shows a state when air is supplied into the cavity 4 of the mold 1. FIG. FIG. 5 is a view showing a state in which an air layer is formed between the resin R and the molded product front side molding surface 212 by the air supplied into the cavity 4.
射出成形機のピストン７が金型１側に押し出され、当該ピストン７の先端が固定金型本体２１のスプルー２１１の基端から所定の寸法ＬAだけ手前の位置Ａに達すると、図３に示されるように、溶融した樹脂Ｒのキャビティ４内への射出が開始される。金型１には、図示省略の冷却装置が設けられているので、スプルー２１１の先端からキャビティ４内に射出された樹脂Ｒは、冷却されながら（固化しながら）キャビティ４の先端側に移動する。 When the piston 7 of the injection molding machine is pushed out to the mold 1 side and the tip of the piston 7 reaches a position A in front of the base end of the sprue 211 of the fixed mold body 21 by a predetermined dimension L A , FIG. As shown, injection of molten resin R into cavity 4 is started. Since the mold 1 is provided with a cooling device (not shown), the resin R injected into the cavity 4 from the tip of the sprue 211 moves to the tip of the cavity 4 while being cooled (solidified). .
キャビティ４にはエア吹出口２３２が設けられているが、エア吹出口２３２のサイズは溶融した樹脂Ｒが進入できない微小なサイズに設定されているので、樹脂Ｒは、エア吹出口２３２から連通路２３１側に浸透することなくキャビティ４内をスプルー２１１から先端側に移動する。 The air blowout port 232 is provided in the cavity 4, but the size of the air blowout port 232 is set to a small size that the molten resin R cannot enter, so that the resin R is connected to the communication path from the air blowout port 232. The inside of the cavity 4 moves from the sprue 211 to the tip side without penetrating into the 231 side.
そして、射出成形機のピストン７が位置Ａから金型１側に所定の寸法だけ離れた位置Ｂ（スプルー２１１の基端から寸法ＬB（＜ＬA）だけ手前の位置）に達したときがキャビティ４内を進行する樹脂Ｒの先端が成形品表側成形面２１２の入れ子２２の部分を通過したタイミングであるとすると、そのタイミングでエアコンプレッサー８が作動し、図４に示されるように、エア吹出口２３２からエアがキャビティ４に供給される。エアコンプレッサー８によるエアの供給は、金型１の型開きが行われるまで継続される。 Then, when the piston 7 of the injection molding machine reaches a position B (a position just before the dimension L B (<L A ) from the base end of the sprue 211) separated from the position A by a predetermined dimension toward the mold 1 side. If it is the timing when the tip of the resin R traveling in the cavity 4 passes through the portion of the insert 22 of the molded product front side molding surface 212, the air compressor 8 is activated at that timing, and as shown in FIG. Air is supplied to the cavity 4 from the air outlet 232. The supply of air by the air compressor 8 is continued until the mold 1 is opened.
キャビティ４内に充填された樹脂Ｒは冷却によって固化し、樹脂成形品５となるが、金型１の型開きまでエアが供給されるので、図５に示されるように、固定金型本体２１の成形品表側成形面２１２と樹脂Ｒの間にエアの層が形成され、樹脂Ｒが固化したとき（樹脂成形品５ができたとき）に、固定金型本体２１の成形品表側成形面２１２と樹脂Ｒが密着することがない。 The resin R filled in the cavity 4 is solidified by cooling and becomes a resin molded product 5. However, since air is supplied until the mold 1 is opened, as shown in FIG. When a layer of air is formed between the molded product front side molding surface 212 and the resin R and the resin R is solidified (when the resin molded product 5 is formed), the molded product front side molded surface 212 of the fixed mold body 21 is formed. And resin R do not adhere to each other.
従って、図６に示すように、可動金型３を固定金型本体２１から水平に引いて型開きをしたときに、樹脂成形品５の意匠面５１の凸凹５１ａのエッジ部分（図６の点線で示すエッジ部分Ｐ）が固定金型本体２１の成形品表側成形面２１２の凸凹２１２ａのエッジ部分（図６の点線で示すエッジ部分Ｑ）と擦れることがないので、樹脂成形品５の意匠面５１に白化やカジリが生じることを確実に防止することができる。 Therefore, as shown in FIG. 6, when the movable mold 3 is pulled horizontally from the fixed mold body 21 to open the mold, the edge portion of the irregularities 51 a of the design surface 51 of the resin molded product 5 (dotted line in FIG. 6). The edge portion P) shown in FIG. 6 does not rub against the edge portion of the unevenness 212a (the edge portion Q indicated by the dotted line in FIG. 6) of the molded product front side molding surface 212 of the fixed mold main body 21. It is possible to reliably prevent whitening and galling in 51.
また、キャビティ４内に供給された樹脂Ｒは、冷却されながら（固化しながら）スプルー２１１からキャビティ４の先端側に移動するため、キャビティ４の先端側では樹脂Ｒの粘度が上昇し、これにより成形品表側成形面２１２の凸凹２１２ａと擦れて白化やカジリが生じ易くなるが、本実施形態では、樹脂Ｒが入れ子２２のシボ成形面を通過すると、当該樹脂Ｒと成形品表側成形面２１２の間にエアを供給して隙間を形成するので、固化しつつある樹脂Ｒが成形品表側成形面２１２の凸凹２１２ａと擦れて白化やカジリが生じるのを防止することができる。 Further, since the resin R supplied into the cavity 4 moves from the sprue 211 to the tip side of the cavity 4 while being cooled (solidified), the viscosity of the resin R increases at the tip side of the cavity 4, thereby In this embodiment, when the resin R passes through the embossed molding surface of the insert 22, the resin R and the molded product front side molding surface 212 are rubbed against the unevenness 212 a of the molded product front side molding surface 212. Since the gap is formed by supplying air therebetween, it is possible to prevent the resin R being solidified from rubbing against the unevenness 212a of the molded product front side molding surface 212 to cause whitening or galling.
以上説明したように、本実施形態によれば、金型１のキャビティ４の成形品表側成形面２１２にエア吹出口２３２を設け、キャビティ４内に溶融した樹脂Ｒを射出した後、所定のタイミングでエア吹出口２３２からキャビティ４内にエアを供給するようにしているので、成形品表側成形面２１２によってシボが形成される樹脂成形品５の意匠面５１に白化やカジリが生じるのを好適に防止することができる。 As described above, according to the present embodiment, the air blowout port 232 is provided on the molded product front side molding surface 212 of the cavity 4 of the mold 1, and after the molten resin R is injected into the cavity 4, a predetermined timing is reached. Since air is supplied from the air outlet 232 into the cavity 4, it is preferable that the design surface 51 of the resin molded product 5 on which the emboss is formed by the molded product front side molding surface 212 is whitened or frayed. Can be prevented.
本発明に係る金型１を自動車のインパネ等の大型の樹脂成形品に適用する場合は、樹脂成形品５の意匠面５１が広いので、固定金型本体２１の成形品表側成形面２１２の複数箇所に入れ子２２によってエア吹出口２３２を設けるようにするとよい。例えば、樹脂成形品５が自動車のインパネの場合、図７に示すように、樹脂成形品（インパネ）５の意匠面５１の左右の端部の部分５１ａ，５１ｂと中央部の部分５１ｃに対応する金型１の成形品表側成形面２１２の部分に、入れ子２２によってエア吹出口２３２を複数個設けるようにするとよい。 When the mold 1 according to the present invention is applied to a large resin molded product such as an instrument panel of an automobile, since the design surface 51 of the resin molded product 5 is wide, a plurality of molded product front side molding surfaces 212 of the fixed mold body 21 are provided. It is advisable to provide the air outlet 232 at the location by the insert 22. For example, when the resin molded product 5 is an instrument panel of an automobile, as shown in FIG. 7, the left and right end portions 51a and 51b and the central portion 51c of the design surface 51 of the resin molded product (instrument panel) 5 correspond. A plurality of air outlets 232 may be provided by the insert 22 in the molded product front side molding surface 212 of the mold 1.
また、樹脂成形品５にアンダーカット部がある場合はそのアンダーカット部を成形するために射出成形用金型にスライド機構が用いられるが、そうした既存のスライド機構のスライド金型を利用してキャビティ４の成形品表側成形面２１２にエア吹出口２３２を形成するようにしてもよい。 In addition, when the resin molded product 5 has an undercut portion, a slide mechanism is used for the injection mold in order to mold the undercut portion. A cavity is formed by using the slide mold of the existing slide mechanism. You may make it form the air blower outlet 232 in the molded article surface side molding surface 212 of No.4.
また、入れ子２２によって形成されるエア吹出口２３２が直線的であった場合、エア吹出口２３２の形状が樹脂成形品５の意匠面５１に残り、その直線的な模様が固定金型本体２１の成形品表側成形面２１２で樹脂成形品５の意匠面５１に形成される曲線のシマ模様に対して違和感を与えるので、図８に示すように、入れ子２２の成形品表側成形面２１２を形成する面の周辺２２ａを曲線にしてエア吹出口２３２を非直線的にし、固定金型本体２１の成形品表側成形面２１２で形成されるシマ模様にエア吹出口２３２で成形される模様を紛れ込ませて目立たなくするようにするとよい。 In addition, when the air outlet 232 formed by the insert 22 is linear, the shape of the air outlet 232 remains on the design surface 51 of the resin molded product 5, and the linear pattern of the fixed mold body 21 Since the molded product front side molding surface 212 gives an uncomfortable feeling to the curved stripe pattern formed on the design surface 51 of the resin molded product 5, as shown in FIG. 8, the molded product front side molding surface 212 of the insert 22 is formed. The air blower outlet 232 is made non-linear by making the periphery 22a of the surface curved, and the pattern formed by the air blower outlet 232 is inserted into the stripe pattern formed by the molded product front side molding surface 212 of the fixed die main body 21. Try to make it inconspicuous.
１ 射出成形用金型
２ 固定金型
２１ 金型本体
２１１ スプルー
２１２ 成形品表側成形面
２２ 入れ子
２２ａ 入れ子の成形品表側成形面の周辺
２３ エア供給路
２３１ 連通路
２３２ エア吹出口
２３２ａ 段差
３ 可動金型
４ キャビティ
５ 樹脂成形品
５１ 意匠面
６ ノズル
７ 射出成形機のピストン
８ エアコンプレッサー
Ｒ 樹脂
DESCRIPTION OF SYMBOLS 1 Injection mold 2 Fixed mold 21 Mold main body 211 Sprue 212 Molded product front side molding surface 22 Nest 22a Periphery of the molded product front side molding surface 23 Air supply path 231 Communication path 232 Air outlet 232a Step 3 Movable mold Mold 4 Cavity 5 Plastic molding 51 Design surface 6 Nozzle 7 Piston of injection molding machine 8 Air compressor R Resin
Claims (4)
前記キャビティに射出された樹脂と前記成形面との間にエアを供給するエア供給手段を備え、
前記成形面は前記第１の金型に固定されており、
前記エア供給手段は、前記溶融した樹脂が前記成形面の微細な凹凸が形成された領域を通過したタイミングで、エアを供給する、
ことを特徴とする射出成形用金型。 A first mold having a molding surface on which fine irregularities are formed, and a second mold that is clamped to the first mold to form a cavity having the shape of a resin molded product, In an injection mold that molds the resin molded product by injecting molten resin into the cavity and solidifying it,
Air supply means for supplying air between the resin injected into the cavity and the molding surface ;
The molding surface is fixed to the first mold;
The air supply means supplies air at a timing when the molten resin passes through a region where fine irregularities of the molding surface are formed,
An injection mold characterized by that.
請求項１に記載の射出成形用金型。 The air supply means continues to supply air until mold opening is performed.
The injection mold according to claim 1.
前記キャビティ内に溶融した樹脂を射出し、当該樹脂が前記成形面の微細な凹凸が形成された領域を通過したタイミングで前記エア供給手段により前記吹出口を介して前記キャビティ内にエアを供給することを特徴とする、樹脂成形品の製造方法。 A first mold having a molding surface on which fine irregularities are formed and an air outlet is provided in a part of the molding surface; and a mold that is clamped to the first mold and A second mold for forming a cavity having a shape; and an air supply means for supplying air to the cavity from the air outlet of the first mold, wherein the molding surface is the first mold. A method for producing a resin molded product using an injection mold fixed to a mold,
The molten resin is injected into the cavity, and air is supplied into the cavity through the air outlet by the air supply means at a timing when the resin passes through a region where fine irregularities on the molding surface are formed. A method for producing a resin molded product, comprising:
請求項３に記載の樹脂成形品の製造方法。The manufacturing method of the resin molded product of Claim 3.
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