JPH069842B2 - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JPH069842B2 JPH069842B2 JP21454884A JP21454884A JPH069842B2 JP H069842 B2 JPH069842 B2 JP H069842B2 JP 21454884 A JP21454884 A JP 21454884A JP 21454884 A JP21454884 A JP 21454884A JP H069842 B2 JPH069842 B2 JP H069842B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- mold
- injection molding
- undercut
- resin
- 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 - Lifetime
Links
- 238000001746 injection moulding Methods 0.000 title claims description 13
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000002087 whitening effect Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は樹脂成形において利用できる射出成形方法に関
するものである。TECHNICAL FIELD The present invention relates to an injection molding method that can be used in resin molding.
従来例の構成とその問題点 従来の射出成形方法において用いられる射出成形金型で
は、第１図(a)，(b)に示すような側面にアンダーカット
のある成形品１０を射出成形する場合、第２図に示すよ
うな金型構造をとっている。第２図において１は取付
板、２はキャビティプレート、３はピン、４はサイドコ
ア、５はコアプレートである。射出成形後第３図に示す
ように金型を開きアンダーカット部を外しているが、実
際は射出成形と同時に第２図のアからイへ向かって樹脂
の収縮が始まりウ部のアンダカット部に白化，メクレ等
が発生し成形不良となっていた。Configuration of Conventional Example and Its Problems When an injection mold used in a conventional injection molding method is used for injection molding a molded product 10 having undercuts on the side surfaces as shown in FIGS. 1 (a) and 1 (b). , Has a mold structure as shown in FIG. In FIG. 2, 1 is a mounting plate, 2 is a cavity plate, 3 is a pin, 4 is a side core, and 5 is a core plate. After injection molding, the mold is opened as shown in Fig. 3 and the undercut portion is removed, but in reality, at the same time as injection molding, resin contraction starts from a to a in Fig. 2 and the undercut portion of the c Molding was defective due to whitening and stains.
発明の目的 本発明は上記したような、射出成形時の収縮による白
化，メクレ等を防止した射出成形方法を提供することを
目的とする。OBJECT OF THE INVENTION It is an object of the present invention to provide an injection molding method which prevents the above-described whitening and clogging due to shrinkage during injection molding.
発明の構成 本発明では、複数のアンダカット部を有する樹脂成形品
を成形する金型として対向して設けられたキャビティプ
レート及びコアプレートと、前記金型の開閉方向に沿っ
て配置された前記複数のアンダカット部のうち射出され
る樹脂が充填される時期の遅い側のアンダカット部を形
成する第１のコアと、前記キャビティプレートに傾斜し
て取り付けられ、前記キャビティプレート及びコアプレ
ートの金型開閉相対移動により前記第１のコアをアンダ
カット部に対し移動させるピンと、前記複数のアンダカ
ット部のうち、樹脂の充填される時期の早い側のアンダ
カット部を形成する第２のコアと、前記第２のコアをア
ンダカット部に対し移動させるシリンダとからなる射出
成形金型を用い、樹脂の射出完了と同時に、かつ型締め
中に前記第２のコアを移動させる。Configuration of the Invention In the present invention, a cavity plate and a core plate provided as opposed to each other as a mold for molding a resin molded product having a plurality of undercut parts, and the plurality of the plurality of mold plates arranged along the opening / closing direction of the mold. A first core forming an undercut portion of the undercut portion on the side where the injection resin is filled later, and a mold for the cavity plate and the core plate, which is attached at an inclination to the cavity plate. A pin that moves the first core with respect to the undercut portion by relative movement of opening and closing; and a second core that forms an undercut portion of the plurality of undercut portions on the side where the resin is filled earlier. An injection molding die including a cylinder for moving the second core with respect to the undercut portion is used. Note: The second core is moved.
実施例の説明 以下、本発明の一実施例について第４図を参照して説明
する。Description of Embodiments An embodiment of the present invention will be described below with reference to FIG.
第４図は本発明に用いる金型の断面を示しており、まず
樹脂を金型内へ射出し充填と同時にエ部のアンダーカッ
トをシリンダー６を使用して外すようにしている。FIG. 4 shows a cross section of the mold used in the present invention. First, the resin is injected into the mold and at the same time as the filling, the undercut at the portion D is removed by using the cylinder 6.
上記のように成形と同時にアンダカットを外すことによ
り成形と同時に発生する樹脂の収縮にによる白化，メク
レ等が防止できる。By removing the undercut at the same time as molding as described above, it is possible to prevent whitening, clogging, etc. due to shrinkage of the resin that occurs at the same time as molding.
発明の効果 以上のように本発明によれば、射出成形時に成形と同時
に始まる収縮によるアンダカット部の白化，メクレ等を
防止することができるため、成形不良を大幅に低減でき
る効果を有する。EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to prevent the undercut portion from being whitened due to shrinkage that starts at the same time as the molding at the time of injection molding, and to prevent clogging. Therefore, molding defects can be significantly reduced.
第１図(a)，(b)は成形品の形状を表わす断面図と正面
図、第２図は従来の成形方法において用いられる金型構
成を示した図、第３図は第２図に示す金型の型開き状態
を示した図、第４図は本発明の一実施例における射出成
形に用いられる金型の断面図である。 １……取付板、２……キャビティプレート、３……ピ
ン、４……サイドコア、５……コアプレート、６……シ
リンダー。FIGS. 1 (a) and 1 (b) are a sectional view and a front view showing the shape of a molded product, FIG. 2 is a view showing a mold structure used in a conventional molding method, and FIG. 3 is a view shown in FIG. FIG. 4 is a view showing a mold open state of the mold shown in FIG. 4, and FIG. 4 is a cross-sectional view of a mold used for injection molding in one embodiment of the present invention. 1 ... Mounting plate, 2 ... Cavity plate, 3 ... Pin, 4 ... Side core, 5 ... Core plate, 6 ... Cylinder.
Claims (1)
を成形する金型として対向して設けられたキャビティプ
レート及びコアプレートと、前記金型の開閉方向に沿っ
て配置された前記複数のアンダカット部のうち、射出さ
れる樹脂が充填される時期の遅い側のアンダカット部を
形成する第１のコアと、前記キャビティプレートに傾斜
して取り付けられ、前記キャビティプレート及びコアプ
レートの金型開閉相対移動により前記第１のコアをアン
ダカット部に対し移動させるピンと、前記複数のアンダ
カット部のうち、樹脂の充填される時期の早い側のアン
ダカット部を形成する第２のコアと、前記第２のコアを
アンダカット部に対し移動させるシリンダとからなる射
出成形金型を用い、樹脂の射出完了と同時に、かつ型締
め中に前記第２のコアを移動させることを特徴とする射
出成形方法。1. A cavity plate and a core plate provided as opposed to each other as a mold for molding a resin molded product having a plurality of undercut parts, and the plurality of unders arranged along the opening / closing direction of the mold. A first core that forms an undercut portion on the side of the cut portion that is later filled with the injected resin, and a mold that is attached to the cavity plate in an inclined manner and that opens and closes the mold of the cavity plate and the core plate. A pin that moves the first core relative to the undercut portion by relative movement; a second core that forms an undercut portion of the plurality of undercut portions that is earlier in time of resin filling; An injection molding die including a cylinder for moving the second core with respect to the undercut portion is used, and at the same time when the injection of the resin is completed and during the mold clamping, Injection molding method characterized by moving the A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21454884A JPH069842B2 (en) | 1984-10-12 | 1984-10-12 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21454884A JPH069842B2 (en) | 1984-10-12 | 1984-10-12 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6192821A JPS6192821A (en) | 1986-05-10 |
| JPH069842B2 true JPH069842B2 (en) | 1994-02-09 |
Family
ID=16657560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21454884A Expired - Lifetime JPH069842B2 (en) | 1984-10-12 | 1984-10-12 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH069842B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358003B (en) * | 2011-07-29 | 2013-11-06 | 宁波双林模具有限公司 | Rotary core loosing and demoulding device for transverse thread slug of injection mold |
-
1984
- 1984-10-12 JP JP21454884A patent/JPH069842B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6192821A (en) | 1986-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |