JPH0825408A - Synthetic resin molding method and molds for molding the resin - Google Patents
Synthetic resin molding method and molds for molding the resinInfo
- Publication number
- JPH0825408A JPH0825408A JP16530394A JP16530394A JPH0825408A JP H0825408 A JPH0825408 A JP H0825408A JP 16530394 A JP16530394 A JP 16530394A JP 16530394 A JP16530394 A JP 16530394A JP H0825408 A JPH0825408 A JP H0825408A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- embedded
- molds
- mold
- metal fitting
- 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.)
- Pending
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 74
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 74
- 238000000465 moulding Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 16
- 229920005989 resin Polymers 0.000 title description 5
- 239000011347 resin Substances 0.000 title description 5
- 239000000463 material Substances 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims description 45
- 229910052751 metal Inorganic materials 0.000 claims description 45
- 230000005389 magnetism Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 2
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004033 plastic Substances 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/005—Compensating volume or shape change during moulding, in general
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/54—Compensating volume change, e.g. retraction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、埋め込み金具のような
埋設物を表面に露出させたエポキシ樹脂等の合成樹脂成
形品を得る合成樹脂成形方法および合成樹脂成形用金型
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molding method and a synthetic resin molding die for obtaining a synthetic resin molded product such as an epoxy resin in which an embedded object such as an embedded metal fitting is exposed on the surface.
【０００２】[0002]
【従来の技術】電気機器用の電気部品のうち、絶縁筒、
電気絶縁ブッシングのような電気絶縁部品は、一般的
に、エポキシ樹脂のような合成樹脂材料の成形によって
得られている。このような樹脂成形品、特に、大型の樹
脂成形品は、その部品の取付けのためのねじ穴を有する
金具が一体的に埋設されて、形成されている。2. Description of the Related Art Of electric parts for electric equipment, insulating cylinders,
Electric insulating parts such as electric insulating bushings are generally obtained by molding a synthetic resin material such as an epoxy resin. Such a resin molded product, especially a large-sized resin molded product, is formed by integrally embedding a metal fitting having a screw hole for mounting the component.
【０００３】図２は、このような、いわゆる埋め込み金
具付き合成樹脂製品および従来の合成樹脂成形方法に用
いられる金型の主要部断面図である。図２（ａ）に示さ
れているように、金型１の所定箇所には、貫通孔２が形
成されている。支持ボルト３が、その軸部３ａを貫通孔
２を経て金型１内に突出させて配置される。金型１内に
は、埋設すべき埋め込み金具４が配置される。埋め込み
金具４は、ねじ穴４ａの開放する端面が金型１の内壁面
に当接するように、そのねじ穴４ａを支持ボルト３の軸
部３ａに螺合させて固定される。このようにして、埋め
込み金具４が金型１内に支持された状態で、金型１内に
合成樹脂材料５が注入され、この注入された合成樹脂材
料５の硬化後、支持ボルト３が、合成樹脂材料５内に埋
設された埋め込み金具４から、回転させながら抜き取ら
れ、その後、成形品となった合成樹脂製品５が金型１か
ら取り出される。FIG. 2 is a sectional view of the main part of such a so-called synthetic resin product with embedded metal fittings and a mold used in a conventional synthetic resin molding method. As shown in FIG. 2A, a through hole 2 is formed at a predetermined position of the mold 1. The support bolt 3 is arranged such that its shaft portion 3 a projects into the mold 1 through the through hole 2. An embedded metal fitting 4 to be embedded is arranged in the mold 1. The embedded fitting 4 is fixed by screwing the screw hole 4a into the shaft portion 3a of the support bolt 3 so that the open end surface of the screw hole 4a abuts the inner wall surface of the mold 1. In this way, the synthetic resin material 5 is injected into the mold 1 with the embedded metal fitting 4 supported in the mold 1, and after the injected synthetic resin material 5 is cured, the support bolt 3 is The embedded metal fitting 4 embedded in the synthetic resin material 5 is pulled out while being rotated, and then the synthetic resin product 5 as a molded product is taken out from the mold 1.
【０００４】[0004]
【発明が解決しようとする課題】ところで、エポキシ樹
脂のような樹脂は、一般に、硬化する際にその体積を収
縮させる。このために、埋め込み金具４を埋設した状態
で注入された合成樹脂材料５は、その硬化時に、金型１
の内面から離れるように体積を収縮させる。しかしなが
ら、この合成樹脂材料５に埋設された埋め込み金具４
は、金型１の内面に固定的に支持されていることから、
合成樹脂材料５の収縮に伴いこれと共に変位することは
なく、逆に、埋め込み金具４が、図２（ｂ）に示されて
いるように、合成樹脂材料の収縮分、その端面から突出
することになる。By the way, a resin such as an epoxy resin generally shrinks its volume when being cured. For this reason, the synthetic resin material 5 injected with the embedded metal fitting 4 embedded therein has the mold 1
Contract the volume away from the inner surface of the. However, the embedded metal fitting 4 embedded in the synthetic resin material 5
Is fixedly supported on the inner surface of the mold 1,
As the synthetic resin material 5 shrinks, it does not move along with it, and conversely, the embedded metal fitting 4 projects from the end surface of the synthetic resin material by the amount of shrinkage of the synthetic resin material, as shown in FIG. 2B. become.
【０００５】このために、樹脂製品の取出し後に、図２
（ｂ）に破線で示すような平坦面を得るための切削加工
が必要となり、製作コストの増大を招く。また、合成樹
脂材料５の収縮に際し、埋め込み金具４の突出部分に引
っ張られた状態で硬化した部分の近傍に大きな歪が残る
ことから、切削加工後においても、クラックの原因の一
つになる虞れがある。従って、本発明の目的は、成形後
に切削加工等を不要とし、埋設物によって内部に大きな
歪を生じることのない合成樹脂材料成形方法およびその
ための金型を提供することにある。For this reason, after taking out the resin product, as shown in FIG.
A cutting process is required to obtain a flat surface as shown by a broken line in (b), which causes an increase in manufacturing cost. Further, when the synthetic resin material 5 shrinks, a large strain remains in the vicinity of the hardened portion in the pulled state of the protruding portion of the embedded metal fitting 4, which may be one of the causes of cracks even after cutting. There is Therefore, an object of the present invention is to provide a synthetic resin material molding method that does not require cutting work after molding and that does not cause a large internal strain due to an embedded object, and a mold therefor.
【０００６】[0006]
【課題を解決するための手段】本願発明に係る方法は、
前述の課題を解決するために、表面に埋設物が露出する
合成樹脂製品を成形する合成樹脂成形方法であって、合
成樹脂製品に埋め込むべき埋設物を金型の内面に磁力で
以て保持したことを特徴とする。また、本願発明に係る
金型は、磁性を有しかつ凹所が開放する面を有する金具
を埋め込んだ合成樹脂製品を成形するための金型に、埋
設される金具の凹所に嵌合する凸部を、磁石により形成
したことを特徴とする。The method according to the present invention comprises:
In order to solve the above-mentioned problems, a synthetic resin molding method for molding a synthetic resin product in which an embedded object is exposed on the surface, in which the embedded object to be embedded in the synthetic resin product is magnetically held on the inner surface of the mold. It is characterized by Further, the mold according to the present invention is fitted to the recess of the embedded metal fitting in the mold for molding the synthetic resin product in which the metal fitting having magnetism and having the surface where the recess is open is embedded. The convex portion is formed of a magnet.
【０００７】[0007]
【作用】本発明に係る合成樹脂成形方法では、金型に保
持された埋め込むべき埋設物は、両者間に作用する磁力
によって保持されていることから、合成樹脂材料の硬化
に伴なう収縮によって、この合成樹脂材料が金型の内面
から離れる際、磁力によって金型に保持された埋設物
は、合成樹脂材料と共に金型から容易に離反する。従っ
て、合成樹脂材料の硬化に伴う収縮時に埋設物が金型に
従来のように取り残されることはなく、合成樹脂材料の
収縮に応じて変位する。また、本発明に係る合成樹脂成
形用金型では、本発明に係る合成樹脂成形方法を適正に
実施することができることに加え、金型に形成された凸
部に金具の凹所を嵌合させることにより、埋設すべき金
具は、容易かつ正確に位置決めされ、しかも磁性によっ
て確実に保持される。In the synthetic resin molding method according to the present invention, the embedded object held in the mold is held by the magnetic force acting between the two, so that the shrinkage caused by the hardening of the synthetic resin material is caused. When the synthetic resin material separates from the inner surface of the mold, the embedded object held in the mold by the magnetic force easily separates from the mold together with the synthetic resin material. Therefore, when the synthetic resin material shrinks due to curing, the embedded object is not left in the mold as in the conventional case, and is displaced according to the shrinkage of the synthetic resin material. Further, in the synthetic resin molding die according to the present invention, in addition to being able to properly carry out the synthetic resin molding method according to the present invention, the recess of the metal fitting is fitted to the convex portion formed on the die. As a result, the metal fitting to be embedded is easily and accurately positioned, and is securely held by magnetism.
【０００８】[0008]
【実施例】以下、本発明に係る合成樹脂成形方法および
これに用いられる合成樹脂成形用金型を図示の実施例に
沿って詳細に説明する。図１は本発明に係る合成樹脂成
形用金型の主要部を部分的に示す断面図である。本発明
に係る合成樹脂成形用金型１０は、例えば図１に示され
ているように、凹所１２を有する一端開放の筒状部材か
らなる埋め込み金具１４が埋設された合成樹脂製品１６
の成形に用いられる。図示の例では、凹所１２は円形の
ねじ穴１２であり、埋め込み金具１４は例えば鉄のよう
な磁性金属材料から成る。The synthetic resin molding method according to the present invention and the synthetic resin molding die used therefor will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a sectional view partially showing a main part of a synthetic resin molding die according to the present invention. The synthetic resin molding die 10 according to the present invention is, for example, as shown in FIG. 1, a synthetic resin product 16 in which an embedding metal fitting 14 made of a tubular member having a recess 12 and having one end opened is embedded.
Used for molding. In the illustrated example, the recess 12 is a circular screw hole 12, and the embedded metal fitting 14 is made of a magnetic metal material such as iron.
【０００９】合成樹脂成形用金型１０の埋め込み金具１
４を支持すべき所定位置には、支持部材１８が固定され
る。支持部材１８は、金型１０の内面に形成された凹部
２０内に収容されかつこれに固定される基部２２と、こ
の基部２２から直角に金型１０内に伸びる凸部たる支持
部２４とを備える。基部２２および支持部２４は、永久
磁石からなる。基部２２の磁力によって支持部材１８を
金型１０に結合することができるが、接着剤等の結合手
段を用いて支持部材１８を確実に金型１０に固定するこ
とが好ましい。この場合、基部２２を磁石以外の例えば
金属材料で構成することができる。Embedded metal fitting 1 for synthetic resin molding die 10
A support member 18 is fixed at a predetermined position where the support member 4 should be supported. The support member 18 includes a base portion 22 that is housed in and fixed to a recess portion 20 formed on the inner surface of the mold 10, and a support portion 24 that is a convex portion that extends from the base portion 22 at a right angle into the mold 10. Prepare The base 22 and the support 24 are made of permanent magnets. The support member 18 can be bonded to the mold 10 by the magnetic force of the base portion 22, but it is preferable to securely fix the support member 18 to the mold 10 using a bonding means such as an adhesive. In this case, the base portion 22 can be made of, for example, a metal material other than the magnet.
【００１０】支持部２４の外径は、この支持部２４を受
け入れるねじ穴１２の内径よりも僅かに小さく、また支
持部２４の長さ寸法は、ねじ穴１２の深さよりも浅い。
従って、金型１０内への合成樹脂材料２６の注入に先立
って、埋め込み金具１４がそのねじ穴１２を支持部材１
８の支持部２４に嵌め込まれるが、この際、円滑な嵌め
込み作業が損なわれることはなく、埋め込み金具１４の
端面が金型１０の内面あるいはこれと同一平面にある基
部２２の内面に当接するように、埋め込み金具１４を正
確な位置でしかも確実に嵌め込むことができる。また、
支持部材１８は、その支持部２４の磁力によって、磁性
材料からなる埋め込み金具１４をがた付きなく確実に保
持する。このように、埋め込み金具１４を確実に保持し
た状態で、金型１０内には、例えば、ケーブル接続部に
使用される絶縁筒あるいは絶縁ブッシングのような電気
絶縁部品のための材料として、エポキシ樹脂材料のよう
な熱硬化性合成樹脂材料２６が注入される。The outer diameter of the support portion 24 is slightly smaller than the inner diameter of the screw hole 12 that receives the support portion 24, and the length dimension of the support portion 24 is shallower than the depth of the screw hole 12.
Therefore, prior to the injection of the synthetic resin material 26 into the mold 10, the embedded metal fitting 14 inserts the screw hole 12 into the support member 1.
8, but the smooth fitting work is not impaired at this time, so that the end surface of the embedded metal fitting 14 is brought into contact with the inner surface of the mold 10 or the inner surface of the base portion 22 which is flush with the inner surface of the mold 10. In addition, the embedded metal fitting 14 can be securely fitted in the correct position. Also,
The support member 18 reliably holds the embedded metal fitting 14 made of a magnetic material without rattling due to the magnetic force of the support portion 24. In this manner, with the embedded metal fitting 14 securely held, epoxy resin is used as a material for an electrically insulating component such as an insulating cylinder or an insulating bushing used for a cable connecting portion in the mold 10. A thermosetting synthetic resin material 26 such as material is injected.
【００１１】この合成樹脂材料２６は、硬化するとその
硬化に伴って、金型１０の内面から離れるように、収縮
する。図３は、収縮後の合成樹脂成形品１６の主要部を
部分的に示す断面図である。合成樹脂材料２６は、その
収縮時、これに埋設された埋め込み金具１４に、この金
具１４が金型１０の内面から離れる方向への強い作用力
を及ぼす。この作用力を受ける埋め込み金具１４は、ね
じ嵌合のような強固な機械的結合手段によって支持部材
１８に結合されてはおらず、磁力によって保持されてい
るに過ぎない。このために、埋め込み金具１４に合成樹
脂材料２６の収縮に伴う強い力が作用すると、図３に示
されているように、埋め込み金具１４は、合成樹脂材料
２６の収縮に伴なってこれと一体的に変位する。When the synthetic resin material 26 is hardened, the synthetic resin material 26 shrinks away from the inner surface of the mold 10 as it hardens. FIG. 3 is a sectional view partially showing a main part of the synthetic resin molded product 16 after contraction. When the synthetic resin material 26 contracts, the synthetic metal material 26 exerts a strong acting force on the embedded metal fitting 14 embedded therein in a direction in which the metal fitting 14 is separated from the inner surface of the mold 10. The embedded metal fitting 14 that receives this acting force is not connected to the support member 18 by a strong mechanical connection means such as screw fitting, but is only held by the magnetic force. Therefore, when a strong force due to the contraction of the synthetic resin material 26 acts on the embedded metal fitting 14, the embedded metal fitting 14 is integrated with the embedded metal fitting 14 as the synthetic resin material 26 contracts, as shown in FIG. Will be displaced.
【００１２】その結果、埋め込み金具１４は、これが露
出する合成樹脂材料２６の面から突出することはなく、
埋め込み金具１４が露出する面はほぼ平坦に保たれる。
このことから、合成樹脂製品２６に従来のような切削加
工を施す必要なく、これを完成することができる。ま
た、合成樹脂材料２６の収縮に際し、埋め込み金具１４
がこれに応じて変位することから、合成樹脂材料２６の
硬化後、埋め込み金具１４の周辺に大きな内部歪が残る
ことはなく、クラックの発生を防止して合成樹脂成形品
の耐久性が高められる。As a result, the embedded metal fitting 14 does not project from the surface of the synthetic resin material 26 from which it is exposed,
The exposed surface of the embedded metal fitting 14 is kept substantially flat.
From this, it is possible to complete the synthetic resin product 26 without having to perform the conventional cutting process. In addition, when the synthetic resin material 26 shrinks, the embedded metal fitting 14
However, since the synthetic resin material 26 is hardened, a large internal strain does not remain around the embedded metal fitting 14 after the synthetic resin material 26 is hardened, cracks are prevented, and the durability of the synthetic resin molded product is improved. .
【００１３】先に述べたところでは、金型１０内に突出
する凸部２４を構成する支持部材１８の支持部２４を永
久磁石で構成した例について説明したが、支持部２４そ
のものを永久磁石で形成することに代えて、支持部２４
の表面にのみ永久磁石を埋め込むことができる。また、
支持部材１８の支持部２４を不要とし、金型に埋設され
る基部２２を永久磁石とし、その磁力で埋め込み金具１
４を保持することもできる。しかしながら、図示の実施
例に示したように、支持部材１８に支持部２４を設け、
この支持部２４を埋め込み金具１４に嵌合させることに
より、この埋め込み金具の正確な位置決めを迅速かつ容
易に行なうことができる。このことから、埋め込み金具
１４に嵌合する凸部２４を設けることが、作業効率を高
める上で、有利である。In the above description, an example in which the supporting portion 24 of the supporting member 18 forming the convex portion 24 protruding into the mold 10 is made of a permanent magnet has been described, but the supporting portion 24 itself is made of a permanent magnet. Instead of forming, the supporting portion 24
The permanent magnet can be embedded only on the surface of the. Also,
The support portion 24 of the support member 18 is not required, the base portion 22 embedded in the mold is a permanent magnet, and the magnetic force thereof causes the embedded metal fitting 1
It is also possible to hold 4. However, as shown in the illustrated embodiment, the support member 24 is provided with the support portion 24,
By fitting the support portion 24 into the embedded metal fitting 14, the embedded metal fitting can be accurately positioned quickly and easily. For this reason, it is advantageous to provide the convex portion 24 that fits into the embedded metal fitting 14 in order to improve work efficiency.
【００１４】さらに、支持部材を磁力源とすることに代
えて、磁力源を埋め込み金具側に設けるために、埋め込
み金具１４の全部あるいは一部を永久磁石とすることが
できる。埋め込み金具１４の一部を永久磁石とする場
合、埋め込み金具以外の非磁性材料から成る埋設物にも
本願方法を適用することができる。何れにしても、金型
に埋め込み金具のような埋設物を保持するために、両者
間に種々の形態で磁力を作用させることができる。ま
た、合成樹脂材料として可塑性合成樹脂材料を用いるこ
とができ、また、電気絶縁部品に限らず、種々の合成樹
脂成形品に本願を適用することができる。Further, instead of using the support member as the magnetic force source, the embedded metal member 14 may be wholly or partly a permanent magnet in order to provide the magnetic force source on the embedded metal member side. When a part of the embedded metal fitting 14 is made of a permanent magnet, the method of the present invention can be applied to an embedded object made of a non-magnetic material other than the embedded metal fitting. In any case, in order to hold an embedded object such as an embedded metal fitting in the mold, magnetic force can be applied between them in various forms. Further, a plastic synthetic resin material can be used as the synthetic resin material, and the present application can be applied to various synthetic resin molded products, not limited to electrical insulating parts.
【００１５】[0015]
【発明の効果】以上説明したように、本発明に係る合成
樹脂成形方法では、埋設物は、合成樹脂材料の硬化に伴
う収縮時に金型に取り残されることはなく、合成樹脂材
料の収縮に応じて変位することから、合成樹脂材料の硬
化後に埋設物が合成樹脂材料から突出することなく、埋
設物が露出する面はほぼ平坦に形成される。従って、本
発明に係る方法によれば、従来のような切削加工を不要
とすることができ、これにより製作コストの低減を図る
ことができる。また、本発明に係る方法によれば、合成
樹脂材料の収縮に際し、埋め込み金具がこれに応じて変
位することから、硬化後に大きな内部歪が残ることはな
く、クラックの発生を防止して合成樹脂成形品の耐久性
を高めることができる。さらに、本発明に係る合成樹脂
成形用金型では、本発明の方法によって得られる効果に
加えて、埋設物である金具は、容易かつ正確に位置決め
され、しかも磁性によって確実に保持されることから、
作業能率を高め、これにより作業効率の一層の向上を図
ることができる。As described above, in the synthetic resin molding method according to the present invention, the embedded material is not left in the mold when contracted due to the curing of the synthetic resin material, and the embedded material is not affected by the contraction of the synthetic resin material. Since the embedded object does not protrude from the synthetic resin material after the synthetic resin material is cured, the surface where the embedded object is exposed is formed to be substantially flat. Therefore, according to the method of the present invention, it is possible to eliminate the conventional cutting process, thereby reducing the manufacturing cost. Further, according to the method of the present invention, when the synthetic resin material is contracted, the embedded metal fitting is displaced accordingly, so that a large internal strain does not remain after curing, and the generation of cracks is prevented. The durability of the molded product can be improved. Further, in the synthetic resin molding die according to the present invention, in addition to the effect obtained by the method of the present invention, the metal fitting which is the buried object is easily and accurately positioned, and moreover, is securely held by magnetism. ,
The work efficiency is increased, and thus the work efficiency can be further improved.
【図１】本発明に係る合成樹脂成形用金型の主要部を部
分的に示す断面図である。FIG. 1 is a sectional view partially showing a main part of a synthetic resin molding die according to the present invention.
【図２】従来の合成樹脂成形用金型および合成樹脂成形
品の主要部を部分的に示す断面図である。FIG. 2 is a sectional view partially showing a main part of a conventional synthetic resin molding die and a synthetic resin molded product.
【図３】本発明に係る合成樹脂成形品の主要部を部分的
に示す断面図である。FIG. 3 is a sectional view partially showing a main part of a synthetic resin molded article according to the present invention.
１０ 金型 １２ 凹所 １４ 埋設物 １６ 合成樹脂成形品 ２４ 凸部 10 Mold 12 Recess 14 Buried 16 Synthetic Resin Molded Product 24 Convex
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 43/18 7365−4Ｆ 43/36 7365−4Ｆ 45/26 9350−4Ｆ // Ｂ２９Ｋ 105:22 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29C 43/18 7365-4F 43/36 7365-4F 45/26 9350-4F // B29K 105: 22
Claims (2)
成形する合成樹脂成形方法であって、 埋め込むべき前記埋設物を金型の内面に磁力で以て保持
し、合成樹脂材料の硬化時の収縮に伴い前記埋設物が前
記金型から離反することを特徴とする合成樹脂成形方
法。1. A synthetic resin molding method for molding a synthetic resin product in which an embedded object is exposed on the surface, wherein the embedded object to be embedded is magnetically held on the inner surface of a mold to cure the synthetic resin material. The method of molding a synthetic resin, wherein the embedded object is separated from the mold with shrinkage of the mold.
る金具の前記凹所が開放する前記面を表面に露出させて
該金具を埋め込んだ合成樹脂製品を成形するための金型
であって、該金型には前記凹所に嵌合する凸部が磁石に
より形成されていることを特徴とする合成樹脂成形用金
型。2. A mold for molding a synthetic resin product, in which the surface of the metal fitting having magnetism and having a surface in which the recess is opened is exposed on the surface and the metal fitting is embedded. A mold for synthetic resin molding, characterized in that a convex portion that fits into the recess is formed by a magnet in the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530394A JPH0825408A (en) | 1994-07-18 | 1994-07-18 | Synthetic resin molding method and molds for molding the resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16530394A JPH0825408A (en) | 1994-07-18 | 1994-07-18 | Synthetic resin molding method and molds for molding the resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0825408A true JPH0825408A (en) | 1996-01-30 |
Family
ID=15809774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16530394A Pending JPH0825408A (en) | 1994-07-18 | 1994-07-18 | Synthetic resin molding method and molds for molding the resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825408A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006041781A1 (en) * | 2004-10-04 | 2006-04-20 | Graham Packaging Pet Technologies Inc. | Method and apparatus for compensating for in mold material shrinkage |
-
1994
- 1994-07-18 JP JP16530394A patent/JPH0825408A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006041781A1 (en) * | 2004-10-04 | 2006-04-20 | Graham Packaging Pet Technologies Inc. | Method and apparatus for compensating for in mold material shrinkage |
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