JPH0516183A - Metal mold for injection molding and method for preparation of metal mold - Google Patents
Metal mold for injection molding and method for preparation of metal moldInfo
- Publication number
- JPH0516183A JPH0516183A JP19489591A JP19489591A JPH0516183A JP H0516183 A JPH0516183 A JP H0516183A JP 19489591 A JP19489591 A JP 19489591A JP 19489591 A JP19489591 A JP 19489591A JP H0516183 A JPH0516183 A JP H0516183A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- gas
- hole
- metal mold
- Prior art date
- 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.)
- Withdrawn
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、型の開閉方向に平行な
成形面に滞留するガスを逃すようにした射出成形用金型
及び金型の作成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molding die and a method for producing a die, in which gas accumulated on a molding surface parallel to the opening / closing direction of the die is released.
【0002】[0002]
【従来の技術】従来、例えば樹脂成形品を成形する射出
用金型において、キャビティ内のガス抜きが不足する
と、溶融樹脂の充填不足のため成形品の強度が低下した
り、寸法精度が狂ったり、或いは表面状態が悪化したり
する等の不良現象が生起することから、適切にガス抜き
手段を講じる必要があった。このため例えば、実開昭6
1―71419号とか、実開昭62―67722号のよ
うな金型のガス抜き手段が一般的なガス抜き構造として
知られており、これらはいずれも金型内に設けたガス抜
き孔を型の開閉方向に沿って延出させ、キャビティ内と
外部空間を連通せしめている。2. Description of the Related Art Conventionally, for example, in an injection mold for molding a resin molded product, if the gas inside the cavity is insufficiently depleted, the strength of the molded product will decrease due to insufficient filling of the molten resin, and the dimensional accuracy will change. Or, since a defective phenomenon such as deterioration of the surface condition occurs, it is necessary to take appropriate degassing means. For this reason, for example,
Gas venting means for molds such as No. 1-71419 and No. 62-67722 are known as general gas venting structures, and all of these have a vent hole provided in the mold. It is extended along the opening and closing direction of to make the inside of the cavity communicate with the external space.
【0003】[0003]
【発明が解決しようとする課題】ところが、例えば自動
車のインストルメントパネルのような樹脂成形品は、従
来の方法によるガス抜き手段では完全にガス抜きを行な
うことが出来ないという問題があった。すなわち図4に
示すように、インストルメントパネル20はメータ類を
収納するためのボックス部21を備えているが、このボ
ックス部21の各辺を形成する左側面部22、右側面部
23、上面部24、下面部25の各張り出し部は、金型
成形時に型開閉方向に対して平行面となり、特に樹脂を
注入するゲート26から遠い側の左側面部22にガスが
滞留しやすくなって、同部に不良箇所28が発生すると
いう不具合があった。そして、このように型の開閉方向
に対して平行な成形面からガスを抜く方法は、従来のガ
ス抜き方式では対処し得なかった。However, there has been a problem that a resin molded product such as an instrument panel of an automobile cannot be completely degassed by a conventional degassing means. That is, as shown in FIG. 4, the instrument panel 20 includes a box portion 21 for accommodating meters, and the left side surface portion 22, the right side surface portion 23, and the upper surface portion 24 that form each side of the box portion 21. The protruding portions of the lower surface portion 25 are planes parallel to the mold opening / closing direction during molding of the mold, and in particular, gas is likely to stay on the left side surface portion 22 on the side far from the gate 26 for injecting the resin. There was a problem that a defective portion 28 was generated. The conventional method of degassing cannot deal with such a method of degassing from the molding surface parallel to the opening / closing direction of the mold.
【0004】[0004]
【課題を解決するための手段】かかる課題を解決するた
め、本発明は型の開閉方向にほぼ平行な成形面からガス
を抜くことの出来る金型を構成した。すなわち、雌雄い
ずれかの金型に、成形面から型の分割面に連通するガス
抜き流路を設けた。又、複数の成形面が相対する場合、
各成形面と分割面を連通する複数のガス抜き流路を交差
して設ける。そして、ガス抜き流路として、成形面と分
割面の間に貫通孔を設け、この貫通孔の成形面側に捨て
ピンを設けるとともに、分割面側には型にガス溜め溝を
刻設した。又、捨てピンとして、前記貫通孔とほぼ同径
の円柱部材の外周部をポンチ等で叩いて打痕を形成した
後、該貫通孔に嵌入した。In order to solve the above problems, the present invention comprises a mold capable of releasing gas from a molding surface substantially parallel to the opening / closing direction of the mold. That is, a gas vent passage communicating from the molding surface to the split surface of the mold was provided in either the male or female mold. Also, when multiple molding surfaces face each other,
A plurality of gas vent channels are provided so as to communicate with each molding surface and the division surface. Then, a through hole was provided between the molding surface and the dividing surface as a gas release channel, a discarding pin was provided on the molding surface side of the through hole, and a gas reservoir groove was formed in the mold on the dividing surface side. Further, as a discarding pin, a cylindrical member having a diameter substantially the same as that of the through hole was hit with a punch or the like to form a dent, and then inserted into the through hole.
【0005】[0005]
【作用】型の開閉方向に平行な成形面に滞留するガスは
ガス抜き流路を介して型の分割面に抜かれた後、外部に
逃される。平行な成形面が相対する場合でも、ガス抜き
流路を交差させることで両方の成形面からガス抜きが出
来る。この際、ガス抜き流路は、金型に設けた貫通孔の
形成面側に捨てピンを嵌め込んで、該捨てピン周囲に狭
い流通路を形成し溶融樹脂の入り込みを防止するが、貫
通孔とほぼ同径の円柱部材の外周部を叩いて外面に凹凸
部を設け、凹部となった箇所をガス抜き流路とすること
で容易に構成出来る。The gas staying on the molding surface parallel to the opening / closing direction of the mold is discharged to the outside after being discharged to the dividing surface of the mold through the gas discharging channel. Even if the parallel molding surfaces face each other, the gas can be vented from both molding surfaces by intersecting the gas vent passages. At this time, in the gas vent passage, a waste pin is fitted on the surface of the die where the through hole is formed to form a narrow flow passage around the waste pin to prevent molten resin from entering. It can be easily constructed by striking the outer peripheral portion of a columnar member having substantially the same diameter as that of FIG.
【0006】[0006]
【実施例】本発明の射出成形用金型の実施例について添
付した図面により説明する。図1は本発明の要部を示す
金型縦断面図、図2は捨てピンの拡大図、図3は型開き
状態図、図4は成形したインストルメントパネルの斜視
図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an injection molding die of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a vertical sectional view of a mold showing a main part of the present invention, FIG. 2 is an enlarged view of a waste pin, FIG. 3 is a mold open state view, and FIG. 4 is a perspective view of a molded instrument panel.
【0007】本発明の射出成形用金型は、図4に示す自
動車の内装部品であるインストルメントパネル20の成
形用として構成され、このインストルメントパネル20
は、既述のように左側面部22、右側面部23、上面部
24、下面部25の四辺からなるボックス部21を備え
ているが、各辺の張り出し縁部は内方に向けて折曲して
内方フランジ部22a,23a,24a,25aとされ
ている。又、この内方フランジ部のうち下面部25のフ
ランジ部25aには、メータ類取り付け座としてのリブ
27が突設されている。The injection molding die of the present invention is configured for molding an instrument panel 20 which is an automobile interior component shown in FIG.
As described above, the box portion 21 includes four sides, that is, the left side surface portion 22, the right side surface portion 23, the upper surface portion 24, and the lower surface portion 25. The protruding edge portion of each side is bent inward. And inner flange portions 22a, 23a, 24a, 25a. Further, a rib 27 serving as a meter mounting seat is projected on the flange portion 25a of the lower surface portion 25 of the inner flange portion.
【0008】一方、溶融樹脂を注入するゲート26は中
央一点に設けているが、流動性の良い樹脂材であればか
かる一点からのみでも充分充填することが出来、しかも
型製作費用の削減上有利だからである。On the other hand, the gate 26 for injecting the molten resin is provided at one point in the center, but if the resin material has a good fluidity, it can be sufficiently filled from only this point, and it is advantageous in reducing the die manufacturing cost. That's why.
【0009】ところで、かかる形態のインストルメント
パネル20を成形するにあたり、ゲート26から注入さ
れた溶融樹脂は左右に広がり、ボックス部21側に向う
ものは、ゲート26側に近い右側面部23から内方フラ
ンジ部25aを経て左側面部22に至るもの、及び右側
面部23から下面部25を経て左側面部22に至るもの
等の流れの合流部となり、しかも内方フランジ部25a
にはリブ27が突設されて、その下流には流れの乱流が
起きやすいこと等の理由もあって、特に左側面部22に
ガスの滞留が起きやすかった。When molding the instrument panel 20 of such a form, the molten resin injected from the gate 26 spreads left and right, and the one facing the box portion 21 side is inward from the right side surface portion 23 close to the gate 26 side. It becomes a confluence part of the flow such as the one that reaches the left side surface part 22 through the flange part 25a, the one that reaches the left side surface part 22 through the lower surface part 25 from the right side surface part 23, and the inner flange part 25a.
A rib 27 is provided on the bottom of the rib 27, and a turbulent flow is likely to occur downstream of the rib 27. Therefore, the left side surface portion 22 is apt to accumulate gas.
【0010】又、後述するように、この左右側面部2
2、23、上下面部24、25の各辺は金型製作時に型
の開閉方向に平行となり、又、各内方フランジ部22
a,23a,24a,25aが型の分割面方向に沿って
いるため、従来の方法ではこの左側面部22のガスを有
効に抜くことが出来なかった。そして、ガスが滞留した
状態で固化すると、不良箇所28となり、例えば成形品
表面に白い筋が現われる等の不良を呈していた。As will be described later, the left and right side surfaces 2
Each side of the upper and lower surface portions 24 and 25 is parallel to the opening and closing direction of the mold when the mold is manufactured.
Since a, 23a, 24a, and 25a are along the dividing surface direction of the mold, it is impossible to effectively remove the gas from the left side surface portion 22 by the conventional method. Then, when the gas is solidified in a retained state, it becomes a defective portion 28, which is defective such as white streaks appearing on the surface of the molded product.
【0011】それではかかる箇所のガスを有効に抜くよ
うにした本発明の構成について、図1に基づき説明す
る。金型1は、ボックス部21の内面側を成形する可動
型2と、外面側を成形する固定型3を備え、可動型2は
二段突部2aを有する雄型として構成されるとともに、
固定型3は二段凹部3a(図3)を有する雌型として構
成されている。そして、可動型2が固定型3に対して左
右に型開き、型閉め移動可能となり、図に示すように型
閉め状態でキャビティ6を形成する。Now, the construction of the present invention for effectively venting the gas at such a portion will be described with reference to FIG. The mold 1 includes a movable mold 2 that molds the inner surface side of the box portion 21 and a fixed mold 3 that molds the outer surface side, and the movable mold 2 is configured as a male mold having a two-step protrusion 2a.
The fixed die 3 is configured as a female die having a two-step recess 3a (FIG. 3). Then, the movable mold 2 is opened to the left and right with respect to the fixed mold 3, and the mold can be closed and moved, and the cavity 6 is formed in the mold closed state as shown in the figure.
【0012】このキャビティ6は、図中、インストルメ
ントパネル20の左側面部22を成形する水平な成形面
6aが下方に位置し、右側面部23を成形する水平な成
形面6bが上方に位置するとともに、各内方フランジ部
22a、23aを成形する縦向きの成形面6c、6dが
左方に位置している。つまり不図示のゲート部が上方に
位置することになる。又、水平な成形面6a、6bが型
の開閉方向に対して平行とされることになる。In the cavity 6, in the drawing, a horizontal molding surface 6a for molding the left side surface portion 22 of the instrument panel 20 is located below, and a horizontal molding surface 6b for molding the right side surface portion 23 is located above. The vertical molding surfaces 6c and 6d for molding the inner flange portions 22a and 23a are located on the left side. That is, the gate portion (not shown) is located above. Further, the horizontal molding surfaces 6a and 6b are parallel to the opening / closing direction of the mold.
【0013】又、可動型2の二段突部2aの先端凸部
と、固定型3の二段凹部3aの陥没凹部は、成形品に開
口部(ボックス部21のメータ取り付け穴)を形成する
ためのものであり、このため型閉め状態で、これら先端
凸部と陥没凹部は直接当接しあう分割面(パーティング
ライン)7となる。The tip projection of the two-step projection 2a of the movable mold 2 and the recessed recess of the two-step recess 3a of the fixed mold 3 form an opening (a meter mounting hole for the box 21) in the molded product. Therefore, in the mold closed state, the tip convex portion and the depressed concave portion form a dividing surface (parting line) 7 that directly abuts each other.
【0014】一方、可動型2の型内には、複数の冷却水
通路4…が設けられるとともに、型開閉方向に延びる押
出しピン5が進退動自在に設けられ、先端が内方フラン
ジ部23aを成形するキャビティ6dに臨んでいる。On the other hand, in the mold of the movable mold 2, a plurality of cooling water passages 4 are provided, and an extruding pin 5 extending in the mold opening / closing direction is provided so as to be able to move forward and backward, and the tip end thereof has an inner flange portion 23a. It faces the cavity 6d to be molded.
【0015】可動型2の二段突部2a内には、ガス抜き
流路10が設けられている。このガス抜き流路10は、
二段突部2a内に斜めに穿設された直径約1cm程度の
円形の貫通孔11を備えており、この貫通孔11の一端
側は水平な成形面6aに開口するとともに、他端側は二
段突部2a先端凸部側面に向けて開口し、該開口部の位
置に刻設されたガス溜め溝12に連通している。つまり
このガス溜め溝12は、例えば型開閉方向に沿って設け
られ、深さ約0.1mm程度とされて前面の縦向き分割
面7に連通している。A gas vent passage 10 is provided in the two-stage protrusion 2a of the movable die 2. This degassing channel 10 is
A circular through hole 11 having a diameter of about 1 cm is obliquely formed in the two-stage protrusion 2a. One end of this through hole 11 is opened on a horizontal molding surface 6a and the other end is open. The two-step protrusion 2a opens toward the side of the tip of the convex portion and communicates with the gas reservoir groove 12 formed at the position of the opening. That is, the gas reservoir groove 12 is provided, for example, along the mold opening / closing direction, has a depth of about 0.1 mm, and communicates with the vertical dividing surface 7 on the front surface.
【0016】一方、貫通孔11の成形面6a側には、捨
てピン13が嵌め込まれている。この捨てピン13は、
貫通孔11内に溶融樹脂が入り込むのを防止する栓の作
用を果すものであり、ガスのみを逃すことが出来るよう
にされている。すなわち、図2に示すように、略々貫通
孔11と同径或いは僅かに細径の円柱状鋼材の外周面を
ポンチ等で強く打って微少突起を設け、外周と貫通孔1
1内面とのクリアランスCを、約0.05mm程度に設
定して貫通孔11内に押込んでいる。そして成形面6a
側の端部を斜めに切断して、該成形面6aと同一面にし
ている。On the other hand, a discarding pin 13 is fitted on the molding surface 6a side of the through hole 11. This discard pin 13
It serves as a stopper for preventing the molten resin from entering the through hole 11, and allows only gas to escape. That is, as shown in FIG. 2, the outer peripheral surface of a cylindrical steel material having a diameter substantially the same as or slightly smaller than that of the through hole 11 is strongly struck by a punch or the like to provide minute projections, and the outer periphery and the through hole 1 are provided.
The clearance C from the inner surface of the inner wall 1 is set to about 0.05 mm and is pushed into the through hole 11. And molding surface 6a
The end portion on the side is cut obliquely to be flush with the molding surface 6a.
【0017】ガス抜き流路10は以上のような貫通孔1
1、ガス溜め溝12、捨てピン13によって構成されて
いるが、その作用について説明する。固定型3と可動型
2が型締めされ、ゲートから溶融樹脂が注入されると溶
融樹脂はキャビティ6内を順次流動して充填される。こ
の際、既述のように成形面6aにガスが滞留してくる
が、このガスは、ガス抜き流路10の貫通孔11と捨て
ピン13の間のクリアランスCからガス溜め溝12に向
けて排出され、このガス溜め溝12から分割面を介して
逃される。このため、成形面6aの品質が損われるよう
な不具合がない。そして成形が終え、固化すると図3に
示すように型開きして押出しピン5によって製品を突き
出す。The gas vent channel 10 has the through hole 1 as described above.
1, the gas reservoir groove 12, and the discard pin 13, the operation will be described. When the fixed mold 3 and the movable mold 2 are clamped and the molten resin is injected from the gate, the molten resin sequentially flows and is filled in the cavity 6. At this time, the gas stays on the molding surface 6a as described above, but this gas is directed from the clearance C between the through hole 11 and the discarding pin 13 of the gas vent channel 10 toward the gas reservoir groove 12. It is discharged and escaped from the gas reservoir groove 12 through the dividing surface. Therefore, there is no problem that the quality of the molding surface 6a is impaired. When the molding is completed and solidified, the mold is opened as shown in FIG.
【0018】又、以上のようなガス抜き流路10は、同
時に他の成形面6b側のガスを抜くべく複数設けるよう
にしてもよい。この場合は、不図示であるがガス抜き流
路が交差して設けられることになり、両成形面6a、6
bからのガスを抜いて一層品質の高い成形を行なうこと
が出来る。Further, a plurality of the gas vent passages 10 as described above may be provided so as to vent the gas on the side of the other molding surface 6b at the same time. In this case, although not shown, the degassing flow paths are provided so as to intersect with each other, and both molding surfaces 6a, 6a
The gas from b can be removed to perform higher quality molding.
【0019】[0019]
【発明の効果】以上のように本発明の射出用金型は、型
開閉方向に平行な成形面に滞留するガスをキャビティ外
に抜き取ることが出来るので、ガス抜き不足による表面
状態の悪化、寸法精度の狂い等の不具合を防止すること
が出来る。又、ガス抜き流路の構成は、貫通孔を設けて
捨てピンを嵌め込むだけの至って簡単な構成であり、捨
てピンの製作も容易である。As described above, in the injection mold of the present invention, the gas staying on the molding surface parallel to the mold opening / closing direction can be extracted to the outside of the cavity. It is possible to prevent problems such as incorrect accuracy. Further, the structure of the gas vent channel is as simple as providing a through hole and fitting the waste pin therein, and the waste pin can be easily manufactured.
【図1】本発明の要部を示す金型縦断面図FIG. 1 is a vertical cross-sectional view of a mold showing a main part of the present invention.
【図2】捨てピンの拡大図[Fig.2] Enlarged view of the waste pin
【図3】金型の型開き状態図[Fig. 3] Mold open state diagram
【図4】成形したインストルメントパネルの斜視図FIG. 4 is a perspective view of a molded instrument panel.
2 可動型 3 固定型 6a、6b 成形面 7 分割面 10 ガス抜き流路 11 貫通孔 12 ガス溜め溝 13 捨てピン 2 movable 3 fixed type 6a, 6b molding surface 7 division planes 10 degassing channel 11 through holes 12 gas reservoir groove 13 Discarded pin
Claims (4)
スを抜くようにした金型において、雌雄いずれかの金型
に、前記成形面から型の分割面に連通するガス抜き流路
を設けたことを特徴とする射出成形用金型。1. A mold in which gas is discharged from a molding surface that is substantially parallel to the opening / closing direction of the mold, and a gas vent passage communicating from the molding surface to the dividing surface of the mold is provided in one of the male and female molds. An injection molding die characterized by being provided.
けられ、各成形面と型の分割面を連通する複数のガス抜
き流路が交差して設けられたことを特徴とする請求項1
に記載の射出成形用金型。2. The molding surface is provided so as to be opposed to each other at different positions, and a plurality of gas vent passages that connect the molding surface and the mold dividing surface are provided to intersect with each other. 1
The mold for injection molding according to.
結ぶ貫通孔と、この貫通孔の成形面側一端に設けた捨て
ピンと、型の分割面側に刻設したガス溜め溝からなるこ
とを特徴とする請求項1又は請求項2に記載の射出成形
用金型。3. The gas vent passage comprises a through hole connecting the molding surface and the dividing surface, a discarding pin provided at one end of the through hole on the molding surface side, and a gas reservoir groove formed on the dividing surface side of the mold. The mold for injection molding according to claim 1 or 2, wherein
円柱部材からなり、該円柱部材の外周面をポンチ等で叩
いて打痕を形成した後、前記貫通孔に嵌入したことを特
徴とする金型の作成方法。4. The throwing pin is made of a columnar member having substantially the same diameter as the through hole, and the outer peripheral surface of the columnar member is struck by a punch or the like to form a dent and then fitted into the through hole. How to make a mold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19489591A JPH0516183A (en) | 1991-07-09 | 1991-07-09 | Metal mold for injection molding and method for preparation of metal mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19489591A JPH0516183A (en) | 1991-07-09 | 1991-07-09 | Metal mold for injection molding and method for preparation of metal mold |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0516183A true JPH0516183A (en) | 1993-01-26 |
Family
ID=16332118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19489591A Withdrawn JPH0516183A (en) | 1991-07-09 | 1991-07-09 | Metal mold for injection molding and method for preparation of metal mold |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0516183A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010115858A (en) * | 2008-11-13 | 2010-05-27 | Ube Machinery Corporation Ltd | Mold |
CN113664175A (en) * | 2021-08-17 | 2021-11-19 | 无锡佳浩多精密机械有限公司 | Vacuum die-casting forming method and device for aluminum alloy communication cavity |
-
1991
- 1991-07-09 JP JP19489591A patent/JPH0516183A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010115858A (en) * | 2008-11-13 | 2010-05-27 | Ube Machinery Corporation Ltd | Mold |
CN113664175A (en) * | 2021-08-17 | 2021-11-19 | 无锡佳浩多精密机械有限公司 | Vacuum die-casting forming method and device for aluminum alloy communication cavity |
CN113664175B (en) * | 2021-08-17 | 2024-06-07 | 无锡佳浩多精密机械有限公司 | Vacuum die-casting forming method and equipment for aluminum alloy communication cavity |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |