JPH049147Y2 - - Google Patents
Info
- Publication number
- JPH049147Y2 JPH049147Y2 JP3291686U JP3291686U JPH049147Y2 JP H049147 Y2 JPH049147 Y2 JP H049147Y2 JP 3291686 U JP3291686 U JP 3291686U JP 3291686 U JP3291686 U JP 3291686U JP H049147 Y2 JPH049147 Y2 JP H049147Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- slide pin
- injection molding
- bumper
- temperature
- 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.)
- Expired
Links
- 238000001746 injection moulding Methods 0.000 claims description 19
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 238000000465 moulding Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
（産業上の利用分野）
本考案は、大型で補強リブを有する成形体の射
出成形に使用する射出成形装置に関するものであ
る。
（従来の技術）
一般に自動車用のプラスチツク製バンパ等の大
型の成形体は、成形後、その端末箇所に変形が発
生するために、補強を兼ねた補強リブを備えてい
る。この補強リブの位置は、成形体の形状によつ
て異なるが、成形体の全体からみて成形条件が安
定した状態で決定されるものである。この種の射
出成形型としては、第５図に示すように、周知の
通り、可動金型１を固定金型２に型締めして、そ
の間に形成されたキヤビテイに補強リブ３を備え
たバンパ４の射出成形を行なつている。
（考案が解決しようとする問題点）
上記構成による成形型では、例えば始業時のよ
うに射出成形運転の初期、または断続した運転に
おいて成形型の温度が低い場合、冷却が十分行な
われるために成形されたバンパの変形は少ない
が、連続運転では成形型の温度が高くなつて、冷
却が不十分となり、温度が高い状態でバンパを成
形型から取り出すので、バンパの上部が垂れ下が
ることが多い。この垂れ下がりを防止するため
に、その垂れ下がりが発生する箇所の縦方向に補
強リブを形成するようにキヤビテイの設計を行な
つているが、上記した運転初期のように成形型の
温度が低い時は、第４図に示すように補強リブ３
が突つ支い棒のような作用をして、その箇所が上
に盛り上がる状態になり、所望のバンパ４の成形
が達成できない問題点がある。
そこで、本考案は上記問題点を解決するために
なされたものであつて、成形される成形体の補強
リブに対向した可動金型または固定金型のいずれ
か一方に、そのキヤビテイ面から進退動するスラ
イドピンを設けることによつて、補強リブに金型
の温度に応じた切欠部を形成するので成形型の温
度に無関係で変形しない成形体を得ることができ
る射出成形装置を提供することを目的とする。
（問題点を解決するための手段）
上記目的を達成するために本考案の特徴は、可
動金型または固定金型のいずれか一方に貫通孔を
穿設し、該貫通孔内にキヤビテイ内への突出量に
応じて成形体の補強リブの形状を変えるスライド
ピンを進退動自在に嵌挿し、さらに前記金型の温
度に応じて前記スライドピンの突出量を制御する
制御手段を設けたことである。
（作用）
上記構成による射出成形装置によつて射出成形
する際、変形の原因となる成形体の補強リブの箇
所に対して、型締め前に金型の温度に応じてスラ
イドピンをあらかじめ所定の長さだけキヤビテイ
面から外側へ突き出させておく。そして、型締め
の後、射出成形することによつて、スライドピン
の突き出た量の切欠部が補強リブに形成されるの
で成形型の温度に無関係で変形しない成形体を得
ることができる。
（実施例）
以下に本考案の実施例を図面に基づいて説明す
る。まず、第１図は本考案の射出成形装置を示す
一実施例である。この射出成形装置５は第５図を
もとに従来の技術としてすでに説明したものと共
通の箇所を有するので、その箇所には同じ符号を
付すことにする。第１図に示す射出成形装置５の
固定金型２と可動金型１はそれぞれの固定取付板
６と、スペーサ７を介して可動取付板８に取り付
けられている。固定金型２には成形体としてのバ
ンパ４に対応したキヤビテイ９が形成され、この
キヤビテイ９に対して、さらに一方のキヤビテイ
９を有する可動金型１が型締めされている。この
ようにしてなるバンパ４のキヤビテイ９はバンパ
４の本体１０と、この本体１０を補強するための
補強リブ３とに対応したものとなつている。この
補強リブ３のためのキヤビテイ９で、可動金型１
のキヤビテイ面１２に沿つた箇所の可動金型１内
には貫通孔１３が穿設されて、上記の貫通孔１３
よりも大径に形成された大径孔１４へ延びてい
る。大径孔１４は、さらに貫通孔１３の中心軸と
直交する方向に可動金型１に穿設された摺動孔１
５に通じている。上記した貫通孔１３内には棒状
のスライドピン１６を嵌め入れ、スライドピン１
６の基端部１７にはスライドピン１６よりも大径
の押上部１８を形成して、上記した大径孔１４に
嵌まり込むようになつている。押上部１８の段部
１９と大径部１４の段部２０との間には間〓が形
成され、その中に位置するスライドピン１６には
ばね部材２１が装着されている。このばね部材２
１の通常状態では、スライドピン１６の先端面が
可動金型１のキヤビテイ面１２と近接した位置に
ある。一方、スライドピン１６に基端部１７に形
成された押上部１８の底面には、上記した摺動孔
(Industrial Application Field) The present invention relates to an injection molding apparatus used for injection molding of a large molded article having reinforcing ribs. (Prior Art) In general, large molded products such as plastic bumpers for automobiles are provided with reinforcing ribs that also serve as reinforcement because deformation occurs at the end portions of the molded products after molding. The position of this reinforcing rib varies depending on the shape of the molded product, but is determined while the molding conditions are stable from the perspective of the entire molded product. As shown in FIG. 5, this type of injection molding mold includes, as is well known, a movable mold 1 clamped to a fixed mold 2, and a bumper provided with reinforcing ribs 3 in a cavity formed between them. 4 injection molding is being carried out. (Problem to be solved by the invention) With the mold having the above configuration, when the temperature of the mold is low at the beginning of the injection molding operation, for example at the start of the operation, or during intermittent operation, the mold is sufficiently cooled and the molding is performed. Although there is little deformation of the bumper, the temperature of the mold becomes high during continuous operation and cooling becomes insufficient, and the bumper is removed from the mold at a high temperature, so the upper part of the bumper often sags. In order to prevent this sagging, the cavity is designed to form reinforcing ribs in the vertical direction at the point where the sagging occurs, but when the temperature of the mold is low, such as in the early stages of operation, , as shown in Fig. 4, the reinforcing rib 3
There is a problem in that the bumper 4 acts like a protruding support rod and the bumper 4 is raised upwards, making it impossible to form the bumper 4 as desired. Therefore, the present invention was devised to solve the above-mentioned problems, and the purpose of the present invention is to move the movable mold or the fixed mold, which faces the reinforcing ribs of the molded product to be molded, from its cavity surface to advance and retract. To provide an injection molding apparatus that can obtain a molded article that does not deform regardless of the temperature of the mold because a notch is formed in the reinforcing rib according to the temperature of the mold by providing a slide pin that purpose. (Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that a through hole is bored in either the movable mold or the fixed mold, and the cavity is inserted into the through hole. A slide pin that changes the shape of the reinforcing rib of the molded body according to the amount of protrusion of the molded body is inserted so as to be movable forward and backward, and a control means is further provided to control the amount of protrusion of the slide pin according to the temperature of the mold. be. (Function) When injection molding is performed using the injection molding apparatus configured as described above, slide pins are set in advance according to the temperature of the mold before mold clamping to the reinforcing ribs of the molded product that cause deformation. Leave the length sticking out from the cavity surface. Then, by injection molding after mold clamping, a notch corresponding to the amount by which the slide pin protrudes is formed in the reinforcing rib, so that a molded product that does not deform regardless of the temperature of the mold can be obtained. (Example) An example of the present invention will be described below based on the drawings. First, FIG. 1 shows an embodiment of the injection molding apparatus of the present invention. Since this injection molding apparatus 5 has parts common to those already described as the prior art based on FIG. 5, the parts will be given the same reference numerals. A fixed mold 2 and a movable mold 1 of an injection molding apparatus 5 shown in FIG. 1 are attached to a movable mounting plate 8 via respective fixed mounting plates 6 and spacers 7. A cavity 9 corresponding to a bumper 4 as a molded body is formed in the fixed mold 2, and a movable mold 1 having one cavity 9 is further clamped to this cavity 9. The cavity 9 of the bumper 4 thus constructed corresponds to the main body 10 of the bumper 4 and the reinforcing ribs 3 for reinforcing this main body 10. In the cavity 9 for this reinforcing rib 3, the movable mold 1
A through hole 13 is bored in the movable mold 1 at a location along the cavity surface 12 of the through hole 13.
It extends to a large-diameter hole 14 formed to have a larger diameter. The large diameter hole 14 further includes a sliding hole 1 bored in the movable mold 1 in a direction perpendicular to the central axis of the through hole 13.
5. A rod-shaped slide pin 16 is fitted into the through hole 13 described above, and the slide pin 1
A push-up portion 18 having a larger diameter than the slide pin 16 is formed at the base end 17 of the slide pin 16, and is adapted to fit into the large-diameter hole 14 described above. A gap is formed between the stepped portion 19 of the push-up portion 18 and the stepped portion 20 of the large diameter portion 14, and a spring member 21 is attached to the slide pin 16 located within the gap. This spring member 2
1, the tip end surface of the slide pin 16 is located close to the cavity surface 12 of the movable mold 1. On the other hand, the bottom surface of the push-up part 18 formed at the base end 17 of the slide pin 16 has the above-mentioned sliding hole.
【表】
この表−１から考察すると、成形型の温度が低
い時は、成形されたバンパ４の冷却が十分行なわ
れるためにスライドピン１６を押し出して切欠部
２８を大きくする。一方、成形型の温度が高い時
は成形されたバンパ４の収縮が大きくなるために
スライドピン１６を引き込み切欠部２８を小さく
する。本実施例では、スライドピン１６を可動金
型１に形成したが、成形体のキヤビテイ９に応じ
て固定金型２に設けてもよい。
以上のような本考案の射出成形装置５によつて
成形体としてのバンパ４を射出成形する場合、ま
ず、型締め前に温度センサ２７が検出する温度に
応じてシリンダ２５を作動し、作動ブロツク２４
を摺動させることによつて、上記した表−１の切
欠部２８とｈ，ｘの関係からスライドピン１６の
突き出す長さを決定する。そして、型締め後、射
出成形するが、この成形されたバンパ４を第３図
および第４図に示している。このような成形型の
温度に応じて補強リブ３の切欠部２８の大きさを
変化させることによつて、収縮による変形のない
バンパ４が成形できる。
なお、本実施例によつて説明したスライドピン
１６は一本だけのように説明したが、これは第６
図に従来のバンパ４の成形状態を示したように、
変形の原因となる複数の補強リブ３に対しても、
複数のスライドピン１６を形成し、これを作動ブ
ロツク２４に当接させることによつて、上記と同
様にして切欠部２８の大きさを変えることができ
る。
また、スライドピン１６がキヤビテイ面１２か
ら突き出る長さは、成形型の温度の変化に応じ
て、図示省略されている制御装置により、自動的
に変化させ、所望の変形しないバンパ４の成形が
できる。
（考案の効果）
以上述べたことから、本考案による射出成形装
置は成形される成形体が有する補強リブに対し、
成形型の温度に応じて切欠部の大きさを変化させ
ることができるので、成形型の温度差による成形
体の変形は、最早、発生することはない。このこ
とから、成形体の仕上り寸法が安定し、不良率が
低減できた。[Table] Considering this Table 1, when the temperature of the mold is low, the slide pin 16 is pushed out and the notch 28 is enlarged in order to sufficiently cool the molded bumper 4. On the other hand, when the temperature of the mold is high, the shrinkage of the molded bumper 4 increases, so the slide pin 16 is pulled in to make the notch 28 smaller. In this embodiment, the slide pin 16 is formed in the movable mold 1, but it may be provided in the fixed mold 2 depending on the cavity 9 of the molded product. When injection molding the bumper 4 as a molded object using the injection molding apparatus 5 of the present invention as described above, first, the cylinder 25 is operated according to the temperature detected by the temperature sensor 27 before mold clamping, and the operation block is activated. 24
By sliding the slide pin 16, the protruding length of the slide pin 16 is determined from the relationship between the notch 28 and h and x in Table 1 above. After clamping the mold, injection molding is performed, and the molded bumper 4 is shown in FIGS. 3 and 4. By changing the size of the notch 28 of the reinforcing rib 3 in accordance with the temperature of the mold, the bumper 4 can be molded without deformation due to shrinkage. Although the present embodiment has been described as having only one slide pin 16, this is the same as the sixth slide pin 16.
As shown in the figure, the molding state of the conventional bumper 4,
Regarding the multiple reinforcing ribs 3 that cause deformation,
By forming a plurality of slide pins 16 and bringing them into contact with the actuating block 24, the size of the notch 28 can be changed in the same manner as described above. Further, the length of the slide pin 16 protruding from the cavity surface 12 is automatically changed by a control device (not shown) according to changes in the temperature of the mold, so that the desired bumper 4 that does not deform can be molded. . (Effects of the invention) From the above, the injection molding apparatus according to the invention has
Since the size of the notch can be changed depending on the temperature of the mold, deformation of the molded body due to temperature differences between the molds no longer occurs. As a result, the finished dimensions of the molded product were stabilized and the defective rate was reduced.
第１図は、本考案の射出成形装置を示す縦断面
図、第２図は、スライドピンの突き出す長さの詳
細を示す拡大図、第３図は、成形された成形体を
示す正面図、第４図は、第３図に矢印Ａ−Ａによ
つて示す断面図、第５図は、従来の射出成形装置
を示す縦断面図、第６図は、従来の成形体の変形
した例を示す正面図である。
１……可動金型、２……固定金型、３……補強
リブ、４……成形体（バンパ）、９……キヤビテ
イ、１３……貫通孔、１６……スライドピン、２
４，２５，２６……制御手段（作動ブロツク、シ
リンダ、ピストンロツド）。
FIG. 1 is a longitudinal sectional view showing the injection molding apparatus of the present invention, FIG. 2 is an enlarged view showing details of the protruding length of the slide pin, and FIG. 3 is a front view showing the molded product. FIG. 4 is a sectional view indicated by arrow A-A in FIG. 3, FIG. 5 is a longitudinal sectional view showing a conventional injection molding apparatus, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Movable mold, 2... Fixed mold, 3... Reinforcement rib, 4... Molded body (bumper), 9... Cavity, 13... Through hole, 16... Slide pin, 2
4, 25, 26... Control means (actuating block, cylinder, piston rod).
Claims (1)
孔を穿設し、該貫通孔内にキヤビテイ内への突出
量に応じて成形体の補強リブの形状を変えるスラ
イドピンを進退動自在に嵌挿し、さらに前記金型
の温度に応じて前記スライドピンの突出量を制御
する制御手段を設けたことを特徴とする射出成形
装置。 A through hole is drilled in either the movable mold or the fixed mold, and a slide pin is fitted into the through hole so as to be able to move forward and backward, changing the shape of the reinforcing ribs of the molded body according to the amount of protrusion into the cavity. An injection molding apparatus, further comprising a control means for controlling the amount of protrusion of the slide pin according to the temperature of the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291686U JPH049147Y2 (en) | 1986-03-07 | 1986-03-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291686U JPH049147Y2 (en) | 1986-03-07 | 1986-03-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62144614U JPS62144614U (en) | 1987-09-11 |
| JPH049147Y2 true JPH049147Y2 (en) | 1992-03-06 |
Family
ID=30840035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3291686U Expired JPH049147Y2 (en) | 1986-03-07 | 1986-03-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049147Y2 (en) |
-
1986
- 1986-03-07 JP JP3291686U patent/JPH049147Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62144614U (en) | 1987-09-11 |
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