JPH0452029Y2 - - Google Patents
Info
- Publication number
- JPH0452029Y2 JPH0452029Y2 JP8092687U JP8092687U JPH0452029Y2 JP H0452029 Y2 JPH0452029 Y2 JP H0452029Y2 JP 8092687 U JP8092687 U JP 8092687U JP 8092687 U JP8092687 U JP 8092687U JP H0452029 Y2 JPH0452029 Y2 JP H0452029Y2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core
- outer mold
- synthetic resin
- core 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.)
- Expired
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 15
- 239000000057 synthetic resin Substances 0.000 claims description 15
- 238000001746 injection moulding Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、合成樹脂射出成形用の金型構造に関
するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mold structure for synthetic resin injection molding.
合成樹脂で射出成形する場合に、内面形状が
やゝ複雑な射出成形品（ワーク）は、芯型を有す
る金型によつて射出成形されることが多い。この
芯型は、外型に形成された孔に前後動可能に嵌め
込まれており、成形時には前進して外型の表面か
ら突出し、型抜き時に後退して外型の表面から退
入する。従つて、芯型の表面と芯型が嵌め込まれ
る外型の孔との間にクリアランスが必要であり、
小さい隙間が存在するが、金型を使用していると
摩耗してこの隙間が大きくなる。従つて、成形時
に溶融した合成樹脂がこの隙間に侵入して凝固す
るので、バリが発生する。このために、後工程で
バリ取り作業が必要になり、作業が煩雑で、生産
性が低下するので、金型を比較的短期使用すると
廃棄しなければならない不具合があつた。
When injection molding is performed using synthetic resin, injection molded products (workpieces) with rather complex inner surfaces are often injection molded using a mold having a core mold. This core mold is fitted into a hole formed in the outer mold so as to be movable back and forth, and moves forward during molding and protrudes from the surface of the outer mold, and retreats and retracts from the surface of the outer mold during demolding. Therefore, a clearance is required between the surface of the core mold and the hole of the outer mold into which the core mold is fitted.
A small gap exists, but as the mold is used, it wears out and this gap becomes larger. Therefore, the synthetic resin melted during molding enters this gap and solidifies, resulting in burrs. For this reason, deburring work is required in the post-process, which makes the work complicated and reduces productivity, resulting in the problem that the mold must be discarded after being used for a relatively short period of time.
そこで本考案は、芯型を有する金型によつて射
出成形するにもかかわらず、後工程でのバリ取り
作業が不要になり、生産性が著しく向上するとと
もに金型寿命を長くすることが可能な合成樹脂射
出成形用の金型構造を提供することを目的とする
ものである。
Therefore, although injection molding is performed using a mold with a core, this invention eliminates the need for deburring in the post-process, significantly improving productivity and extending the life of the mold. The purpose of this invention is to provide a mold structure for synthetic resin injection molding.
本考案の構成は、前後動可能に外型に嵌め込ま
れ、ワークの内面を成形する芯型を有する金型の
構造であつて、この芯型が前進して成形位置にあ
るときに、芯型の表面の外型表面から僅かに奥側
の位置に凹部が鉢巻状に形成されたことを特徴と
するものである。
The configuration of the present invention is a structure of a mold having a core mold that is fitted into an outer mold so as to be movable back and forth and molds the inner surface of the workpiece. It is characterized by a headband-shaped recess formed on the surface of the mold at a position slightly on the back side from the outer mold surface.
すなわち、金型を使用していると摺動部分が摩
耗して芯型の表面と芯型が嵌め込まれる外型の孔
との間の隙間が拡大し、成形時に溶融した合成樹
脂がこの隙間に侵入するが、外型表面から僅かに
奥側の位置に凹部が鉢巻状に形成されているの
で、この凹部に侵入して塊状になつて凝固する。
そして、型抜き時に、芯型を外型から後退させる
と凹部で凝固した合成樹脂が芯型と共に移動して
ワークから離れるので、ワークとこの凹部で凝固
した合成樹脂との間でバリが切れる。そこで、外
型表面から例えば0.1mm程度奥側に凹部を形成し
ておけば、切れたバリの長さは極めて短くなる。
このため、型抜き時にバリ取り作業が自然に行わ
れたのと同等の結果になり、後工程におけるバリ
取り作業が不要になつて生産性が著しく向上す
る。また、芯型の表面と芯型が嵌め込まれる外型
の孔との間の隙間が拡大しても金型を使用できる
ので、金型寿命は著しく長くなる。 In other words, when a mold is used, the sliding parts wear out and the gap between the surface of the core mold and the hole in the outer mold into which the core mold is inserted expands, and the synthetic resin molten during molding fills this gap. However, since there is a headband-shaped recess formed at a position slightly deeper than the outer mold surface, it penetrates into this recess and solidifies into a lump.
Then, when the core mold is retreated from the outer mold during die cutting, the synthetic resin solidified in the recess moves together with the core mold and separates from the workpiece, so that burrs are cut between the workpiece and the synthetic resin solidified in the recess. Therefore, if a recess is formed at a distance of, for example, 0.1 mm from the surface of the outer mold, the length of the cut burr will be extremely short.
Therefore, the result is the same as if the deburring work was performed naturally during die cutting, and the deburring work in the post-process is no longer necessary, resulting in a marked improvement in productivity. Furthermore, the mold can be used even if the gap between the surface of the core mold and the hole of the outer mold into which the core mold is fitted increases, so the life of the mold is significantly extended.
以下に図面に示す実施例に基いて本考案を具体
的に説明する。
The present invention will be specifically described below based on embodiments shown in the drawings.
図面は長期間使用されて摺動部分が摩耗した金
型を示すが、外型は、固定側外型１と可動側外型
２とで構成され、ワークＷの外面を成形する。可
動側外型２に形成された孔にワークＷの内面を成
形するための芯型３が嵌め込まれており、可動側
外型２に対して前後動可能になつている。成形時
には、芯型３が前進しており、第１図に示すよう
に、固定側外型１と可動側外型２および芯型３で
郭定される空間がキヤビテイ５である。そして、
芯型３の表面であつて、芯型３が前進位置にある
ときに、可動側外型２の表面２ａから0.1mm程度
奥側の位置に凹部４が全周にわたつて鉢巻状に形
成されている。 Although the drawing shows a mold whose sliding parts have been worn out due to long-term use, the outer mold is composed of a fixed outer mold 1 and a movable outer mold 2, and molds the outer surface of the workpiece W. A core mold 3 for molding the inner surface of the workpiece W is fitted into a hole formed in the movable outer mold 2, and is movable back and forth with respect to the movable outer mold 2. During molding, the core mold 3 is moving forward, and as shown in FIG. 1, the space defined by the fixed outer mold 1, the movable outer mold 2, and the core mold 3 is the cavity 5. and,
On the surface of the core mold 3, when the core mold 3 is in the forward position, a recess 4 is formed in a headband shape around the entire circumference at a position about 0.1 mm deep from the surface 2a of the movable outer mold 2. ing.
しかして、図示略のゲートからキヤビテイ５に
溶融した合成樹脂を注入する。このとき、溶融合
成樹脂の一部は芯型３の表面と可動側外型２に形
成された孔の隙間を通つて凹部４に侵入し、凝固
する。凝固が完了すると型開きするが、これによ
つてワークＷは固定側外型１から抜ける。そし
て、芯型３を可動側外型２から後退させるが、凹
部４で凝固した合成樹脂は芯型３と共に移動し、
第３図に示すように、ワークＷから切れる。この
とき、可動側外型２の表面２ａから凹部４までの
距離が0.1mm程度であるので、切れたバリの長さ
は極めて短く、後工程でバリ取り作業を必要とし
ないので、生産性が向上する。 Then, molten synthetic resin is injected into the cavity 5 through a gate (not shown). At this time, a part of the molten synthetic resin enters the recess 4 through the gap between the surface of the core mold 3 and the hole formed in the movable outer mold 2, and solidifies. When the solidification is completed, the mold is opened, and the workpiece W is thereby removed from the fixed outer mold 1. Then, the core mold 3 is retreated from the movable outer mold 2, but the synthetic resin solidified in the recess 4 moves together with the core mold 3.
As shown in FIG. 3, the workpiece W can be cut. At this time, since the distance from the surface 2a of the movable outer mold 2 to the recess 4 is approximately 0.1 mm, the length of the cut burr is extremely short, and no deburring work is required in the subsequent process, which improves productivity. improves.
なお、次の射出成形の前に、凹部４で凝固した
合成樹脂を除去する必要はない。それは、次の射
出成形で凹部４の方向に侵入した溶融合成樹脂
は、既に凝固している合成樹脂に接触して溶着す
るが、芯型３を後退させる時に、この部分で再び
切断するからである。 Note that it is not necessary to remove the synthetic resin solidified in the recess 4 before the next injection molding. This is because the molten synthetic resin that enters the recess 4 during the next injection molding comes into contact with the already solidified synthetic resin and welds it, but when the core mold 3 is moved back, it is cut again at this part. be.
以上説明したように、本考案は、芯型の表面の
外型表面から僅かに奥側の位置に凹部を鉢巻状に
形成したので、型抜き時にバリ取り作業が自然に
行われたのと同等の結果になり、長期間使用され
た芯型を有する金型によつて射出成形するにもか
かわらず、後工程におけるバリ取り作業が不要に
なつて生産性が著しく高くなり、かつ金型寿命の
長い合成樹脂射出成形用金型構造とすることがで
きる。
As explained above, in this invention, a recess is formed in a headband shape on the surface of the core mold at a position slightly on the back side from the outer mold surface, so it is equivalent to the natural deburring work performed during mold cutting. As a result, even though injection molding is performed using a mold with a core mold that has been used for a long time, deburring work in the post-process is no longer necessary, significantly increasing productivity and reducing the lifespan of the mold. It can be a long synthetic resin injection mold structure.
第１図は本考案実施例の断面図、第２図と第３
図は型抜き工程の説明図である。
１……固定側外型、２……可動側外型、３……
芯型、４……凹部、５……キヤビテイ、Ｗ……ワ
ーク。
Figure 1 is a sectional view of the embodiment of the present invention, Figures 2 and 3 are
The figure is an explanatory diagram of the die cutting process. 1... Fixed side outer mold, 2... Movable side outer mold, 3...
Core type, 4... recess, 5... cavity, W... work.
Claims (1)
内面を成形する芯型を有する金型の構造であつ
て、この芯型が前進して成形位置にあるときに、
芯型の表面の外型表面から僅かに奥側の位置に凹
部が鉢巻状に形成されたことを特徴とする合成樹
脂射出成形用金型構造。 A structure of a mold having a core mold which is fitted into an outer mold so as to be movable back and forth and molds the inner surface of an injection molded product, and when the core mold moves forward and is in the molding position,
A mold structure for synthetic resin injection molding, characterized in that a headband-shaped recess is formed on the surface of a core mold at a position slightly on the back side from the outer mold surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8092687U JPH0452029Y2 (en) | 1987-05-29 | 1987-05-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8092687U JPH0452029Y2 (en) | 1987-05-29 | 1987-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63189617U JPS63189617U (en) | 1988-12-06 |
| JPH0452029Y2 true JPH0452029Y2 (en) | 1992-12-08 |
Family
ID=30932185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8092687U Expired JPH0452029Y2 (en) | 1987-05-29 | 1987-05-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452029Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0661764B2 (en) * | 1989-04-19 | 1994-08-17 | 日精樹脂工業株式会社 | Mold for molding |
-
1987
- 1987-05-29 JP JP8092687U patent/JPH0452029Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63189617U (en) | 1988-12-06 |
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