JPH0193323A - Compression molding method utilizing ejector of plastic injection molding machine - Google Patents
Compression molding method utilizing ejector of plastic injection molding machineInfo
- Publication number
- JPH0193323A JPH0193323A JP14112387A JP14112387A JPH0193323A JP H0193323 A JPH0193323 A JP H0193323A JP 14112387 A JP14112387 A JP 14112387A JP 14112387 A JP14112387 A JP 14112387A JP H0193323 A JPH0193323 A JP H0193323A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- ejector
- plastic injection
- injection molding
- method utilizing
- 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
- 238000001746 injection moulding Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims description 4
- 238000000748 compression moulding Methods 0.000 title description 3
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims abstract description 3
- 239000007924 injection Substances 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
＊ 産業上の利用分野
精密エンジニャリングプラスチック部品射出成型に関す
るものであります。[Detailed Description of the Invention] * This invention relates to the field of industrial application: precision engineering, injection molding of plastic parts.
＊ 従来の技術
プラスチックレンズ等の成型にあたっては、金型を二度
締め直す（増し締め）方法による圧縮成型がなされてい
るが、成型品の周辺にバリが出来る等、ギヤ、プーリー
など周辺の機能を必要とするものには適当でないと共に
、既存の金型、射出成型機は、使用出来ず新たに造り替
えなければならない。当発明は、従来の金型や射出成型
機に少々の改良を加えることにより充分、使用出来る利
点がある。* Conventional technology When molding plastic lenses, etc., compression molding is performed by tightening the mold twice (retightening), but this can cause burrs to form around the molded product, and damage to peripheral functions such as gears and pulleys. Not only is it unsuitable for products that require this, but existing molds and injection molding machines cannot be used and must be rebuilt. The present invention has the advantage that it can be fully used with conventional molds and injection molding machines by making slight improvements.
＊ 問題点を解決する為の手段方法
従来の圧縮成型が金型全体の増し締めをしたのに対し、
当発明は、金型の締まった状態で、唯一の動く部分、エ
ジェクター（金型が開いてから、成型品を突き落とす為
に押し出すものとされていた）を、固まる寸前の樹脂内
に押し出すことにより、内容樹脂に圧縮を加え、成型後
の収縮を防ぐ方法であります。*Means and methods to solve the problemIn contrast to conventional compression molding, which requires retightening of the entire mold,
This invention works by extruding the only moving part, the ejector (which was supposed to eject the molded product after the mold is opened, into the resin that is about to harden) when the mold is closed. , is a method that applies compression to the resin content to prevent shrinkage after molding.
これによって、成型後の収縮による、ギヤ、プーリー等
の、芯振れ、面振れ、を防ぎ、アームレバー等の、反り
を止め、より精度の高い製品を造ることが出来る。This prevents center runout and surface runout of gears, pulleys, etc. due to shrinkage after molding, and prevents warping of arm levers, etc., making it possible to manufacture products with higher precision.
エジェクターの動きの説明のため其の部分ビックアップ
した、簡単な図面であります。金型の断面を想定してい
ます。
（１） （Ａ）のキャパシティに樹脂が入って、射出
完了とタイミングを合わせて、（Ｂ）のエジェクターを
樹脂内に押し出します。と、（２）の状態になります（
理解して頂くために、オーバーに書いてありまずカリ
（３）エジェクターを抜くと、（Ｃ）の黒の部分の容量
だけ、樹脂が圧縮されます。樹脂の収縮率は、１００分
の数ミリ代なので、充分効果をあげることか出来ます。This is a simple drawing with some parts enlarged to explain the movement of the ejector. The cross section of the mold is assumed. (1) When resin enters capacity (A) and injection is completed, ejector (B) pushes out the resin. Then, the state (2) will be obtained (
For your understanding, if you first remove the potash (3) ejector as written above, the resin will be compressed by the capacity of the black part (C). The shrinkage rate of the resin is a few hundredths of a millimeter, so it can be quite effective.
Claims (1)
ジェクターピンを樹脂内に押し出すことに因って型内の
体積を小さくして型内樹脂に対する圧縮効果を得る成型
方法。A molding method that reduces the volume inside the mold by pushing an ejector pin into the resin just before the injection ends and hardens during plastic injection molding, thereby achieving a compression effect on the resin inside the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14112387A JPH0193323A (en) | 1987-06-05 | 1987-06-05 | Compression molding method utilizing ejector of plastic injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14112387A JPH0193323A (en) | 1987-06-05 | 1987-06-05 | Compression molding method utilizing ejector of plastic injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0193323A true JPH0193323A (en) | 1989-04-12 |
Family
ID=15284695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14112387A Pending JPH0193323A (en) | 1987-06-05 | 1987-06-05 | Compression molding method utilizing ejector of plastic injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0193323A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07137107A (en) * | 1994-04-20 | 1995-05-30 | Fanuc Ltd | Injection molding method |
| RU2505439C2 (en) * | 2009-04-07 | 2014-01-27 | Сименс Аг Эстеррайх | Method of control over vehicle air cushioning system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122835A (en) * | 1982-01-18 | 1983-07-21 | Omron Tateisi Electronics Co | Mold for injection molding |
| JPS58132531A (en) * | 1982-02-01 | 1983-08-06 | Omron Tateisi Electronics Co | Injection molding method by force |
| JPS59146806A (en) * | 1983-02-10 | 1984-08-22 | Matsushita Electric Ind Co Ltd | Mold apparatus |
-
1987
- 1987-06-05 JP JP14112387A patent/JPH0193323A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122835A (en) * | 1982-01-18 | 1983-07-21 | Omron Tateisi Electronics Co | Mold for injection molding |
| JPS58132531A (en) * | 1982-02-01 | 1983-08-06 | Omron Tateisi Electronics Co | Injection molding method by force |
| JPS59146806A (en) * | 1983-02-10 | 1984-08-22 | Matsushita Electric Ind Co Ltd | Mold apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07137107A (en) * | 1994-04-20 | 1995-05-30 | Fanuc Ltd | Injection molding method |
| RU2505439C2 (en) * | 2009-04-07 | 2014-01-27 | Сименс Аг Эстеррайх | Method of control over vehicle air cushioning system |
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