JPH0329573B2 - - Google Patents
Info
- Publication number
- JPH0329573B2 JPH0329573B2 JP26184587A JP26184587A JPH0329573B2 JP H0329573 B2 JPH0329573 B2 JP H0329573B2 JP 26184587 A JP26184587 A JP 26184587A JP 26184587 A JP26184587 A JP 26184587A JP H0329573 B2 JPH0329573 B2 JP H0329573B2
- Authority
- JP
- Japan
- Prior art keywords
- lining
- molding
- core mold
- molded product
- 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 - Lifetime
Links
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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
- B29C45/14622—Lining the inner or outer surface of tubular 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
- B29C2045/14877—Pretreatment of the insert, e.g. etching, cleaning preheating or precooling the insert for non-deforming purposes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression 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、ライニングを有する円筒状成形品の
成形方法に関し、インサートとしてコア金型に取
付けられたライニングが変形したり、バリが発生
したりするのを防止することを目的とする。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of molding a cylindrical molded product having a lining, and the present invention relates to a method for molding a cylindrical molded product having a lining, and is a method for molding a cylindrical molded product that is attached to a core mold as an insert, and prevents the lining from deforming or causing burrs. The purpose is to prevent
ライニングを有する成形品においては、ライニ
ングは可撓性の材料により構成されている。
In a molded article having a lining, the lining is made of a flexible material.
このような成形品を成形する場合、予めライニ
ングを成形しておき、これをインサートとし、成
形品本体を成形するという方法がしばしば行われ
ている。 When molding such a molded product, a method is often used in which a lining is molded in advance, this is used as an insert, and the main body of the molded product is molded.
円筒状の成形品では、ライニングをコア金型に
予めセツトして成形する。 For cylindrical molded products, the lining is set in advance in a core mold and molded.
ライニングの材料として弗素樹脂のものがしば
しば使用される。弗素樹脂系ライニングは可撓性
であり、熱膨張率は10-4／℃のオーダーで、金属
のそれより６〜10倍程度である。従つて、通常の
方法で成形する場合、成形時金型温度にまで加熱
されると、膨張して金型との間に隙間ができ、そ
の隙間に樹脂が入りこみ、バリを発生させたり、
ライニングが変形したりする。 Fluororesin is often used as the lining material. Fluororesin linings are flexible and have a coefficient of thermal expansion on the order of 10 -4 /°C, which is about 6 to 10 times higher than that of metal. Therefore, when molding by a normal method, when heated to the mold temperature during molding, it expands and creates a gap between it and the mold, and the resin enters the gap, causing burrs.
The lining may become deformed.
このような欠点のない成形方法は未だ見出され
ていない。 A molding method free from such drawbacks has not yet been found.
本発明はライニングをインサートとする円筒状
成形品の成形において、バリの発生やライニング
の変形という欠点のない成形方法を提供すること
を目的とする。
An object of the present invention is to provide a method for molding a cylindrical molded product using a lining as an insert, which is free from the drawbacks of burr generation and deformation of the lining.
〔発明の構成〕
本発明は、弗素樹脂系ライニングを有する円筒
状成形品の成形方法において、所定の金型成形温
度においては、コア金型の外径より若干小さい内
径のライニングを、予めコア金型温度より高温に
予熱することによりライニングの内径をコア金型
の径より大きくしてコア金型にセツトし、その
後、樹脂により成形品本体を成形することを特徴
とする円筒状成形品の成形方法に関するものであ
る。[Structure of the Invention] The present invention provides a method for molding a cylindrical molded product having a fluororesin lining, in which, at a predetermined molding temperature, a lining having an inner diameter slightly smaller than the outer diameter of the core mold is placed in advance on the core mold. Molding of a cylindrical molded product characterized by preheating to a higher temperature than the mold temperature to make the inner diameter of the lining larger than the diameter of the core mold, setting it in the core mold, and then molding the molded product body with resin. It is about the method.
本発明において、金型温度は、成形される樹脂
によるが、140〜160℃程度である。弗素樹脂系ラ
イニングはそれより高い温度、通常20℃程度高い
温度に加熱されるので、その温度は、160〜180℃
である。従つて、ライニング材料はかなり耐熱性
のあるもの、例えば、TFE樹脂、DFA樹脂、
FEP樹脂等が好ましい。ライニングの形状は、
前記金型温度においては、ライニングがセツトさ
れるコア金型の外径より若干小さい円径とする。
そしてこのライニングを前記金型温度より高い温
度にまで加熱することにより、その内径をコア金
型の外径より若干大きく膨張させる。この状態で
コア金型にセツトする。 In the present invention, the mold temperature is approximately 140 to 160°C, depending on the resin to be molded. Fluororesin lining is heated to a higher temperature, usually about 20°C, so the temperature is 160 to 180°C.
It is. Therefore, the lining material should be fairly heat resistant, such as TFE resin, DFA resin,
FEP resin etc. are preferred. The shape of the lining is
At the above mold temperature, the circular diameter is set to be slightly smaller than the outer diameter of the core mold in which the lining is set.
By heating this lining to a temperature higher than the mold temperature, its inner diameter is expanded to be slightly larger than the outer diameter of the core mold. In this state, set it in the core mold.
コア金型にセツトされたライニングは、その温
度が金型温度にまで低下するので、収縮し、コア
金型に密着する。 The temperature of the lining set in the core mold decreases to the mold temperature, so that it contracts and tightly adheres to the core mold.
しかる後樹脂を投入して、円筒状成形品を成形
する。 After that, resin is added to form a cylindrical molded product.
本発明は、テフロン等のライニング材の熱膨張
係数が金型よりかなり大きいことを利用したもの
で、ライニングをコア金型に密着することができ
るので、ライニングとコア金型との間に樹脂のバ
リが発生するのを防止することができ、ひいて
は、ライニングの変形をも防止できる。従つて、
ライニングを有する円筒状の成形品を、成形不良
を起すことなく成形することができる。
The present invention takes advantage of the fact that the coefficient of thermal expansion of the lining material such as Teflon is considerably larger than that of the mold, and since the lining can be brought into close contact with the core mold, there is no resin between the lining and the core mold. It is possible to prevent the occurrence of burrs and, in turn, to prevent deformation of the lining. Therefore,
A cylindrical molded product having a lining can be molded without causing molding defects.
Claims (1)
の成形方法において、所定の金型成形温度におい
ては、コア金型の外径より若干小さい内径のライ
ニングを、予めコア金型温度より高温に予熱する
ことによりライニングの内径をコア金型の径より
大きくしてコア金型にセツトし、その後、樹脂に
より成形品本体を成形することを特徴とする円筒
状成形品の成形方法。1. In a method for molding a cylindrical molded product having a fluororesin lining, at a predetermined molding temperature, the lining, which has an inner diameter slightly smaller than the outer diameter of the core mold, must be preheated to a higher temperature than the core mold temperature. A method for molding a cylindrical molded product, characterized in that the inner diameter of the lining is made larger than the diameter of the core mold, the lining is set in the core mold, and then the main body of the molded product is molded with resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26184587A JPH01103414A (en) | 1987-10-19 | 1987-10-19 | Molding method of cylindrical molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26184587A JPH01103414A (en) | 1987-10-19 | 1987-10-19 | Molding method of cylindrical molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01103414A JPH01103414A (en) | 1989-04-20 |
| JPH0329573B2 true JPH0329573B2 (en) | 1991-04-24 |
Family
ID=17367546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26184587A Granted JPH01103414A (en) | 1987-10-19 | 1987-10-19 | Molding method of cylindrical molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01103414A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2305547A1 (en) | 2009-09-30 | 2011-04-06 | Honda Motor Co., Ltd. | Arrangement Structure of Evaporated Fuel Treatment Device of Saddle-ride-type Vehicle |
-
1987
- 1987-10-19 JP JP26184587A patent/JPH01103414A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2305547A1 (en) | 2009-09-30 | 2011-04-06 | Honda Motor Co., Ltd. | Arrangement Structure of Evaporated Fuel Treatment Device of Saddle-ride-type Vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01103414A (en) | 1989-04-20 |
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