JPH0732023Y2 - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH0732023Y2 JPH0732023Y2 JP1990097272U JP9727290U JPH0732023Y2 JP H0732023 Y2 JPH0732023 Y2 JP H0732023Y2 JP 1990097272 U JP1990097272 U JP 1990097272U JP 9727290 U JP9727290 U JP 9727290U JP H0732023 Y2 JPH0732023 Y2 JP H0732023Y2
- Authority
- JP
- Japan
- Prior art keywords
- core
- synthetic resin
- opening
- gap
- molding
- 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 - Fee Related
Links
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、板状壁部に開口を有する製品を射出成形する
成形型に関し、特に反応射出成形（RIM成形）するのに
好適な成形型に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a molding die for injection molding a product having an opening in a plate-like wall, and particularly to a molding die suitable for reaction injection molding (RIM molding). Regarding
（従来の技術） 一般に、板状壁部ａに開口ｂを有する製品を射出成形す
る場合、第13図に示すように、開口ｂを成形するコアの
下流側にウェルドマークやボイド（気泡だまりによる不
良部）が生じ易く、これらウェルドマークやボイドの発
生は注入圧力が3Kg/cm2程度の比較的低圧で行なわれるR
IM成形において顕著に現われる。(Prior Art) In general, when a product having an opening b in a plate-shaped wall portion a is injection-molded, as shown in FIG. 13, a weld mark or a void (due to bubble accumulation) is formed on the downstream side of the core forming the opening b. (Defects) are likely to occur, and these weld marks and voids are generated at a relatively low injection pressure of about 3 kg / cm 2 R
Remarkably appears in IM molding.
そこで従来は、実開昭62−50912号公報により知られる
ように、開口を成形するコアに板状壁部の肉厚と同じ寸
法の流路を合成樹脂の流れ方向と平行に設けるようにし
ている。Therefore, conventionally, as known from Japanese Utility Model Laid-Open No. 62-50912, a flow path having the same dimension as the thickness of the plate-shaped wall portion is provided in the core forming the opening in parallel with the flow direction of the synthetic resin. There is.
（考案が解決しようとする課題） 上記した従来のものでは、製品の開口にコアの流路に対
応する比較的太い棒状の不要部が成形されるため、その
除去作業が面倒なものとなりしかも合成樹脂の無駄が多
くなる。特に開口が大きい場合にはコアに流路を多数設
ける必要があって、不要部の除去作業に一層時間かかる
ようになると共に合成樹脂の無駄も多くなる。(Problems to be solved by the invention) In the above-mentioned conventional one, since a relatively thick rod-shaped unnecessary portion corresponding to the core flow path is formed in the opening of the product, the removing work becomes troublesome and the synthesis is complicated. Waste of resin increases. Especially when the opening is large, it is necessary to provide a large number of flow paths in the core, which requires more time to remove unnecessary portions and wastes synthetic resin.
本考案の目的は、不要部の除去作業が簡単に行なえ且つ
合成樹脂の無駄を減少し製品にウェルドマークやボイド
を生じないようにした成形型を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a molding die in which unnecessary work can be easily removed, waste of synthetic resin is reduced, and weld marks and voids are not generated in a product.
（課題を解決するための手段） 上記目的を達成すべく、本考案では、板状壁部に開口を
有する製品を射出成形する成形型において、一方の成形
型の前記開口を成形するコアの端面と他方の成形型の内
面との間に捨ばり用の隙間を設けると共に、合成樹脂の
射出方向上流側からの前記隙間への合成樹脂の流入のみ
を規制する規制部を設けた。(Means for Solving the Problem) In order to achieve the above object, in the present invention, in a molding die for injection molding a product having an opening in a plate-shaped wall portion, an end surface of a core for molding the opening of one molding die. A clearance gap is provided between the molding die and the inner surface of the other molding die, and a restriction portion that restricts only the inflow of the synthetic resin into the clearance from the upstream side in the injection direction of the synthetic resin is provided.
（作用） コアの端面と他方の成形型の内面との間に捨ばり用の隙
間が設けられ、コアの上流側に設けた規制部により上流
側から該隙間への合成樹脂の流れ込みが規制されてコア
の両側部から合成樹脂がスムーズに隙間に流入するよう
になることと相俟って、ウェルドマークやボイドが捨ば
り部に生じる。(Function) A clearance gap is provided between the end surface of the core and the inner surface of the other molding die, and the restriction portion provided on the upstream side of the core restricts the synthetic resin from flowing into the clearance from the upstream side. In combination with the smooth flow of synthetic resin from both sides of the core into the gap, weld marks and voids are formed in the cut-off portion.
（実施例） 第１図乃至第５図を参照して、（１）は板状壁部Ａの開
口Ｂを成形するコア（２）を突設した下型、（３）は上
型を示し、該コア（２）の端面と該上型（３）の内面
（3a）との間に捨ばり用の隙間（４）を設け、さらに該
下型（１）に、前記隙間（４）への合成樹脂の流入を規
制する規制部（５）を前記コア（２）の合成樹脂の流れ
方向上流側に位置するように設けた。(Example) With reference to FIG. 1 to FIG. 5, (1) shows a lower mold having a core (2) protrudingly forming an opening B of a plate-shaped wall portion A, and (3) shows an upper mold. A gap (4) for discarding is provided between the end surface of the core (2) and the inner surface (3a) of the upper die (3), and further to the lower die (1) to the gap (4). The restriction portion (5) for restricting the inflow of the synthetic resin is provided so as to be located on the upstream side in the flow direction of the synthetic resin of the core (2).
該規制部（５）は合成樹脂の流速を弱めるコア（２）の
上流側の第１溝部（5a）と、該第１溝部（5a）から下流
側にのびる該コア（２）の側部の第２溝部（5b）とで構
成され、該第１溝部（5a）を第３図に明示する如く下流
側に向って漸次深くなるように成形すると共に、該各第
２溝部（5b）を下流側に向って漸次浅くなるように形成
した。The restricting portion (5) includes a first groove portion (5a) on the upstream side of the core (2) that weakens the flow velocity of the synthetic resin, and a side portion of the core (2) extending from the first groove portion (5a) to the downstream side. The second groove portion (5b) is formed so that the first groove portion (5a) is gradually deepened toward the downstream side as shown in FIG. 3, and each of the second groove portions (5b) is formed downstream. It was formed so as to gradually become shallower toward the side.
かくて、第１溝部（5a）により合成樹脂の流速が弱めら
れるためコア（２）の上流側部分からの隙間（４）への
合成樹脂の流入が規制され、第２溝部（5b）が下流側に
向って漸次浅くなっているため合成樹脂の流速が早くな
ることと相俟って合成樹脂が該隙間（４）にコア（２）
の両側部からスムーズに流入するようになり、第５図に
示すようにウェルドマークやボイドが開口Ｂの捨ばり部
のみに生じる。Thus, since the flow velocity of the synthetic resin is weakened by the first groove portion (5a), the inflow of the synthetic resin into the gap (4) from the upstream side portion of the core (2) is restricted, and the second groove portion (5b) is downstream. Along with the fact that the synthetic resin is gradually shallower toward the side, the synthetic resin flows faster in the core (2) in the gap (4).
As a result, the weld marks and voids are generated only in the discarded portion of the opening B as shown in FIG.
この場合、隙間（４）の寸法ｔは成形後の開口Ｂの捨ば
りを切除することを考慮すると一般部の厚さＴの15％〜
40％にすることが望ましく、また前記第１溝部（5a）の
深さＨも前記一般部の厚さＴの15％〜40％にすることが
望ましい。In this case, the dimension t of the gap (4) is 15% of the thickness T of the general portion in consideration of cutting off the discarding of the opening B after molding.
It is desirable to set it to 40%, and the depth H of the first groove portion (5a) is also desirably set to 15% to 40% of the thickness T of the general portion.
また、上記実施例では第１溝部（5a）の断面形状を楔状
としたが第６図に示す如く矩形に形成しても良い。Further, in the above embodiment, the cross-sectional shape of the first groove portion (5a) is wedge-shaped, but it may be rectangular as shown in FIG.
また、開口Ｂが円形の場合には第７図に示すように第１
溝部（5a）と第２溝部（5a）とから成る規制部（５）を
コア（２）の略半周に亘るように形成し、また開口Ｂが
三角形でその角部が流入方向を向くときは規制部（５）
を第８図示の如く形成し、或るいはコア（２）の一辺が
流入方向を向くときは規制部（５）を第９図示の如く形
成することが望ましく、開口Ｂが矩形でその角部が流入
方向を向くときは第10図示の如く規制部（５）を形成す
ることが望ましい。When the opening B is circular, as shown in FIG.
When the regulating portion (5) including the groove portion (5a) and the second groove portion (5a) is formed so as to extend over substantially the half circumference of the core (2), and when the opening B has a triangular shape and its corner portion faces the inflow direction, Regulation department (5)
Is formed as shown in FIG. 8, or when one side of the core (2) faces the inflow direction, it is desirable to form the restriction portion (5) as shown in FIG. It is desirable to form the regulating portion (5) as shown in FIG.
また、第11図及び第12図に示すように、コア（２）の上
流側部分を上型（３）の内面（3a）に密着する邪魔壁
（5c）に形成し、該邪魔壁（5c）で前記規制部（５）を
構成することも可能である。Further, as shown in FIG. 11 and FIG. 12, the upstream side portion of the core (2) is formed into a baffle wall (5c) that closely adheres to the inner surface (3a) of the upper mold (3), and the baffle wall (5c It is also possible to constitute the regulation part (5) with ().
かくて、該邪魔壁（5c）により上流側からの隙間（４）
への合成樹脂の流入が阻止されるため、該隙間（４）に
合成樹脂がコア（２）の側方からスムーズに流入され、
ウェルドマークやボイドが開口Ｂのばり部のみに生じる
ようになる。Thus, the gap (4) from the upstream side due to the baffle wall (5c)
Since the synthetic resin is prevented from flowing into the gap (4), the synthetic resin smoothly flows into the gap (4) from the side of the core (2),
Weld marks and voids are generated only in the flash portion of the opening B.
（考案の効果） 以上のように本考案によれば、コアの端面の隙間と規制
部により開口部の捨ばり部にのみウェルドマークやボイ
ドを生じるようにでき、従って不良部のない成形品を得
られると共に、捨ばりは厚さが薄いため上記した従来の
ものに比べ捨ばり即ち不要部の除去作業が簡単に行なえ
且つ合成樹脂の無駄を低減できる効果を有する。(Effect of the Invention) As described above, according to the present invention, it is possible to form a weld mark or a void only in the discarded portion of the opening due to the gap between the end surface of the core and the restriction portion, and thus a molded product having no defective portion can be obtained. In addition to being obtained, since the thickness of the waste is thin, the waste, that is, the unnecessary portion removing work can be easily performed and the waste of the synthetic resin can be reduced as compared with the above-mentioned conventional one.
第１図は本考案装置の１例を示す要部の截断側面図、第
２図は下型の要部の平面図、第３図及び第４図は夫々第
２図のIII−III線及びIV−IV線截断面図、第５図は製品
の要部の平面図、第６図はその変形例を示す要部の截断
面図、第７図乃至第10図は夫々図規制部の変形例を示す
下型の要部の平面図、第11図は他の実施例を示す要部の
截断側面図、第12図はその下型の要部の平面図、第13図
は従来の成形型で成形した製品の要部の平面図である。 （１）…下型（一方の成形型）、（２）…コア （３）…上型（他方の成形型）、（3a）…内面 （４）…隙間、（５）…規制部 Ａ…板状壁部、Ｂ…開口FIG. 1 is a cutaway side view of an essential part showing an example of the device of the present invention, FIG. 2 is a plan view of the essential part of the lower mold, and FIGS. 3 and 4 are III-III line and FIG. IV-IV cross-sectional view, FIG. 5 is a plan view of the main part of the product, FIG. 6 is a cross-sectional view of the main part showing a modified example thereof, and FIGS. Fig. 11 is a plan view of an essential part of a lower die showing an example, Fig. 11 is a cutaway side view of an essential part showing another embodiment, Fig. 12 is a plan view of an essential part of the lower die, and Fig. 13 is a conventional molding. It is a top view of the principal part of the product molded by the mold. (1) ... lower mold (one mold), (2) ... core (3) ... upper mold (other mold), (3a) ... inner surface (4) ... gap, (5) ... regulator A ... Plate-shaped wall portion, B ... Opening
───────────────────────────────────────────────────── フロントページの続き (72)考案者 栗原 恒夫 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (56)参考文献 特開 平１−286807（ＪＰ，Ａ) 特開 昭62−240521（ＪＰ，Ａ) 実開 昭61−204714（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsuneo Kurihara 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (56) Reference JP-A-1-286807 (JP, A) JP A 62-240521 (JP, A) Actually opened 61-204714 (JP, U)
Claims (1)
る成形型において、一方の成形型の前記開口を成形する
コアの端面と他方の成形型の内面との間に捨ばり用の隙
間を設けると共に、合成樹脂の射出方向上流側からの前
記隙間への合成樹脂の流入のみを規制する規制部を設け
たことを特徴とする射出成形型。1. A molding die for injection-molding a product having an opening in a plate-shaped wall portion, which is used for rounding off between an end surface of a core for molding the opening of one molding die and an inner surface of the other molding die. An injection molding die characterized in that a gap is provided, and a regulation portion is provided to regulate only the inflow of the synthetic resin into the gap from the upstream side in the injection direction of the synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990097272U JPH0732023Y2 (en) | 1990-09-18 | 1990-09-18 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990097272U JPH0732023Y2 (en) | 1990-09-18 | 1990-09-18 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0454816U JPH0454816U (en) | 1992-05-11 |
| JPH0732023Y2 true JPH0732023Y2 (en) | 1995-07-26 |
Family
ID=31837500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990097272U Expired - Fee Related JPH0732023Y2 (en) | 1990-09-18 | 1990-09-18 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732023Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01286807A (en) * | 1988-05-14 | 1989-11-17 | Etsuhisa Abe | Molding mold |
-
1990
- 1990-09-18 JP JP1990097272U patent/JPH0732023Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0454816U (en) | 1992-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |