JPS6350177B2 - - Google Patents
Info
- Publication number
- JPS6350177B2 JPS6350177B2 JP20025483A JP20025483A JPS6350177B2 JP S6350177 B2 JPS6350177 B2 JP S6350177B2 JP 20025483 A JP20025483 A JP 20025483A JP 20025483 A JP20025483 A JP 20025483A JP S6350177 B2 JPS6350177 B2 JP S6350177B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- product
- medium
- hole
- 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
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 238000001746 injection moulding Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (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】
本発明は、孔を有する樹脂製品の孔を形成する
中型より脹らんだ孔を得るための樹脂射出成型方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin injection molding method for obtaining medium-sized, more enlarged holes for forming holes in a resin product having holes.
孔を有する樹脂製品を射出成形により得るため
には、第１図にて説明すると製品の外面形状をな
す内面凹部を有する外型２５内に中型２７を配置
した金型内１１に製品を形成する合成樹脂を射出
成型装置により射出して合成樹脂の製品１１を得
るが、射出成形後の合成樹脂は金型内１１で冷却
硬化する際収縮されて中型２７の外面に固着さ
れ、常温に冷却硬化するまで放置すると樹脂製品
内の孔から中型２７が取外せなくなる。このため
通常この様な孔を有する製品を射出成形する場合
は、常温まで冷却する前の高温の状態で金型から
取出し製品から中型を除去するが、この様に射出
成形によつて得られる樹脂の収縮量は大きいため
製品の孔は通常中型が取出し易い様の入口から奥
に向つて小径となる抜き包配を付けるのが常識的
に行われている。しかしながら製品によつては孔
の奥部において漸次拡大する中脹らみの製品が必
要な場合があり、この場合に中型２７を製品の孔
奥部において脹らむ形状にすると、前記のごとく
射出成形後の樹脂製品からの中型の取出し操作を
まつたく行うことが出来ない結果、成型後の中型
取出し時において脹らみ部の形状が縮む様な構造
の中型を用いなければこの様な孔の奥部が中脹ら
みの形状のものを作る事は不可能であつた。 In order to obtain a resin product having holes by injection molding, as explained in FIG. 1, the product is formed in a mold 11 in which a middle mold 27 is placed in an outer mold 25 having an inner recess that forms the outer shape of the product. Synthetic resin is injected by an injection molding device to obtain a synthetic resin product 11. When the synthetic resin after injection molding is cooled and hardened in the mold 11, it is contracted and fixed to the outer surface of the middle mold 27, and then cooled and hardened to room temperature. If left until the resin product is removed, the middle mold 27 will not be able to be removed from the hole in the resin product. For this reason, when a product with such holes is injection molded, the middle mold is removed from the mold at a high temperature before being cooled to room temperature. Since the amount of shrinkage is large, it is common sense to attach a hole in the product with a hole that becomes smaller in diameter from the entrance to the back so that the medium size can be easily taken out. However, depending on the product, a product with a medium bulge that gradually expands in the deep part of the hole may be required. As a result, it is not possible to take out the middle mold from the resin product at once, and if a middle mold with a structure that shrinks the shape of the swollen part is not used, the deep part of the hole like this cannot be removed. However, it was impossible to make one with a swollen shape.
本発明は、上記の欠点を解消して容易に中脹ら
みの孔を有する樹脂製品を得ることを目的とする
もので、その要旨は、製品の外面形状をなす内面
凹部を有する外型内に中型を配置した金型を用
い、前記中型の温度を前記外型の温度よりも高温
に保持した状態で合成樹脂を射出して硬化させる
ことを特徴とする中脹らみの孔を成形する方法で
ある。 The object of the present invention is to solve the above-mentioned drawbacks and easily obtain a resin product having a swollen hole. Molding a medium-bulging hole characterized by using a mold in which a medium mold is arranged, and injecting and curing a synthetic resin while maintaining the temperature of the medium mold at a higher temperature than the temperature of the outer mold. It's a method.
以下本発明の実施例を第１図を参照して説明す
る。図において外型２５内に形成した製品は外面
球状の弁対１１を示し、この弁対１１に中脹らみ
の通孔１３を得る成形方法を示す。 Embodiments of the present invention will be described below with reference to FIG. In the figure, the product formed in the outer mold 25 shows a valve pair 11 having a spherical outer surface, and a molding method for obtaining a medium-bulging through hole 13 in the valve pair 11 is shown.
すなわち成形用型として、弁体外面形状をなす
内面凹部を有しその周囲に冷却水通路２６を設け
た分割式の外形２５と円柱状外面を有する管状中
型２７とを組合せたものを用いる。弁体１１の成
形に際しては、外型２５の通常２６に冷却水を流
し、中型２７の内孔２８に設定された温度の温水
を流している状態で弁体材料を射出し、所定の射
出二次圧力を保つものである。かくして弁体の外
壁球面１２ａの近傍は急速硬化し外殻を整える
が、球状部の中央部１２ｂは中型の中央部２７ａ
により徐冷されているので中央部１２ｂに成形収
縮が集中して中ふくらみの通孔１３が得られる。
通孔の中ふくらみの程度は外型と中型の温度差お
よび射出二次圧力保持時間の設定により変更し得
るが、前記温度差は20〜30度Ｃ、前記保持時間は
外殻が形成されるに必要な時間（小型のものでは
１秒以下の程度）であればよい。 That is, the mold used is a combination of a split-type outer shape 25 having an inner recess shaped like the outer surface of the valve body and a cooling water passage 26 around the recess, and a tubular medium mold 27 having a cylindrical outer surface. When molding the valve body 11, the valve body material is injected while cooling water is flowing through the normal 26 of the outer mold 25 and hot water at a set temperature is flowing through the inner hole 28 of the middle mold 27. This is to maintain the next pressure. In this way, the vicinity of the outer wall spherical surface 12a of the valve body is rapidly hardened and the outer shell is prepared, but the center portion 12b of the spherical portion is not the same as the medium-sized center portion 27a.
Since the molding is slowly cooled, molding shrinkage is concentrated in the central portion 12b, resulting in a medium-bulging through hole 13.
The degree of bulge in the through hole can be changed by setting the temperature difference between the outer mold and the middle mold and the injection secondary pressure holding time, but the temperature difference is 20 to 30 degrees Celsius and the holding time is such that an outer shell is formed. The time required for this (about 1 second or less for small-sized devices) is sufficient.
以上説明のように、本発明は中型の温度を外型
の温度より高温にして樹脂が冷却時の冷却硬化速
度を製品の外面で急速に硬化させるため、成形収
縮が製品の樹脂肉厚中央部から外面に集中されて
中脹らみの孔を得ることができるもので、中型の
形状を製品の中脹らみの形状にする必要がなくこ
のため製品から中型の取外しが容易で樹脂成形作
業が容易に行えるものである。 As explained above, in the present invention, the temperature of the middle mold is set higher than the temperature of the outer mold so that the cooling hardening speed when the resin is cooled is rapidly hardened on the outer surface of the product. It is possible to obtain holes with a medium bulge concentrated on the outer surface of the product, and there is no need to make the shape of the medium sized into the shape of the bulge in the middle of the product.This makes it easy to remove the medium sized from the product and facilitates resin molding work. can be easily performed.
第１図は本発明の実施例を示す射出成形用金型
の射出成形後の状態を示す縦断面図である。
１１…製品、１３…孔、２５…外型、２７…中
型。
FIG. 1 is a longitudinal sectional view showing the state of an injection molding die according to an embodiment of the present invention after injection molding. 11... Product, 13... Hole, 25... Outer mold, 27... Medium mold.
Claims (1)
内に中型を配置した金型を用い、前記内面凹部と
中型との間に合成樹脂を射出して前記孔内で前記
中型の外面形状より脹らんだ孔を得る方法におい
て、前記中型の温度を前記外型の温度よりも高温
に保持した状態で前記合成樹脂を射出して硬化さ
せることを特徴とする中脹らみの孔を形成する方
法。1 Using a mold in which a medium mold is placed within an outer mold having an inner recess that forms the outer shape of the product, a synthetic resin is injected between the inner recess and the middle mold, and the mold bulges from the outer shape of the medium mold within the hole. A method for forming round holes, characterized in that the synthetic resin is injected and cured while the temperature of the middle mold is maintained higher than the temperature of the outer mold. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20025483A JPS5998827A (en) | 1983-10-26 | 1983-10-26 | Molding method of internally expanded hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20025483A JPS5998827A (en) | 1983-10-26 | 1983-10-26 | Molding method of internally expanded hole |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5331076A Division JPS5922109B2 (en) | 1976-05-12 | 1976-05-12 | Spherical valve and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5998827A JPS5998827A (en) | 1984-06-07 |
| JPS6350177B2 true JPS6350177B2 (en) | 1988-10-07 |
Family
ID=16421315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20025483A Granted JPS5998827A (en) | 1983-10-26 | 1983-10-26 | Molding method of internally expanded hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5998827A (en) |
-
1983
- 1983-10-26 JP JP20025483A patent/JPS5998827A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5998827A (en) | 1984-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3136831A (en) | Casting method | |
| KR900009253A (en) | Manufacturing Method of Slider for Slide Fastener | |
| KR940006613A (en) | How to manufacture quasi-new golf balls from used golf balls | |
| JPS60223640A (en) | Production of pipe bend | |
| JPS6350177B2 (en) | ||
| US3020669A (en) | Inflatable buoyant body having conical fastening member thereon | |
| US3012315A (en) | Method of making universal joints | |
| US3510551A (en) | Casting composite articles | |
| JPS6114920A (en) | Molding method of fiber reinforced plastic flanged socket by resin injection method | |
| JP3056024B2 (en) | Manufacturing method of hydrodynamic bearing | |
| GB2270633A (en) | Method of making fibre-reinforced plastics cue having a core. | |
| JPS5684931A (en) | Preparation of synthetic resin molding having curved space inside thereof | |
| JPS60259432A (en) | Forming method of reinforced plastic product | |
| JPH08229904A (en) | Production of concrete molded object having hollow hole and core mold for molding hollow hole of concrete molded object | |
| JP2811289B2 (en) | Molding mold and molding method | |
| JPH03216318A (en) | Manufacture of injection mold | |
| JPS61290022A (en) | Mold | |
| JPH07112449A (en) | Manufacture of lining pipe | |
| JP2557805Y2 (en) | Mold structure with cooling function | |
| KR960016213B1 (en) | Preperation method of the rotor for motor | |
| JPS59150716A (en) | Molding method of thermosetting resin | |
| JPS6012206B2 (en) | How to make bushiyu | |
| JPH0413079B2 (en) | ||
| JPS62211885A (en) | Molding die for cable joint | |
| JPH0259049B2 (en) |