JPS61127322A - Molding method of valve body - Google Patents
Molding method of valve bodyInfo
- Publication number
- JPS61127322A JPS61127322A JP25072884A JP25072884A JPS61127322A JP S61127322 A JPS61127322 A JP S61127322A JP 25072884 A JP25072884 A JP 25072884A JP 25072884 A JP25072884 A JP 25072884A JP S61127322 A JPS61127322 A JP S61127322A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- packing
- mold
- fitting
- synthetic 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.)
- Granted
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
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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はゲート弁やストップ弁等に装着される合成樹脂
製弁体の射出成形法に関し、殊に弁体に取付けられるシ
ール用パツキンの一部を弁体中に埋め込む様に射出成形
する方法に関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an injection molding method for synthetic resin valve bodies to be attached to gate valves, stop valves, etc. The present invention relates to a method of injection molding the valve body so as to embed the valve body into the valve body.
ゲート弁等に装着される弁体は例えば第５図に示す様に
弁体本体１側から矢印入方向く圧送されてくる水を阻止
するもので、弁体２は弁体本体１の上方に嵌合されるキ
ャップの中心を貫通して螺合される弁軸４の下端に遊支
され、弁軸４の昇降によって弁体２の開閉が行なえる様
に構成されている。５は給水孔で本体１の上方側壁に複
数個穿設されてお勺、弁体２の上昇によって水の上昇通
路が開放される結果、阻止されていた水は弁体２の側方
を矢印Ｂの様にすプ抜け、更に矢印Ｃに沿って給水孔５
から放出されていく。A valve body attached to a gate valve or the like is used to block water that is forced to flow in the direction of the arrow from the valve body 1 side, as shown in FIG. 5, for example. The valve shaft 4 is loosely supported at the lower end of a valve shaft 4 that penetrates through the center of the cap to be fitted, and is configured so that the valve body 2 can be opened and closed by raising and lowering the valve shaft 4. Reference numeral 5 denotes water supply holes, which are drilled in multiple holes in the upper side wall of the main body 1.As a result of the rise of the valve body 2, the rising passage for water is opened, and the blocked water flows out along the side of the valve body 2 as shown by the arrow. Drop out as shown in B, and then go through the water supply hole 5 along arrow C.
It is released from.
一方弁体２には図示した様なパツキン６が嵌合され、本
体内壁１ａと弁体２の間に形成される間隙を閉塞して止
水効果を発揮するものである。ところがパツキン６には
弁体の昇降に伴う本体内壁１ａとの摩擦及び本体１側か
らの水圧を受けるものであるから、その都度弁体２から
脱離する方向への力を受けることになる。その為離脱し
にくいアンダーカット形状をパツキン６に与えてこれを
弁座７とリング８によって挾持せしめている。On the other hand, a packing 6 as shown is fitted into the valve body 2 to close the gap formed between the inner wall 1a of the main body and the valve body 2, thereby exhibiting a water-stopping effect. However, since the packing 6 is subjected to friction with the inner wall 1a of the main body and water pressure from the main body 1 side as the valve body moves up and down, it receives a force in the direction of detaching from the valve body 2 each time. For this reason, the gasket 6 is given an undercut shape that makes it difficult to separate, and the gasket 6 is held between the valve seat 7 and the ring 8.
ところが以上の様に構成された弁体２では弁座７とリン
グ８の挾持圧がパツキン６の保持力を決定しているので
、弁座７とリング８の挾持状態が何らかの事情によって
変化し、例えばかたむきや隙間が形成されるとパツキン
６の把持力が悪くな）、パッキン６０嵌合が不完全とな
ってパツキン６が離脱し易くなる。この様な事故は弁体
２の使用期間が長くなれば長くなる種発生し易くなる。However, in the valve body 2 configured as described above, the clamping pressure between the valve seat 7 and the ring 8 determines the holding force of the seal 6, so the clamping state between the valve seat 7 and the ring 8 may change due to some circumstances. For example, if the packing 6 is bent or a gap is formed, the gripping force of the packing 6 will be poor), the fitting of the packing 60 will be incomplete, and the packing 6 will easily come off. Such accidents become more likely to occur as the period of use of the valve body 2 increases.
これはパツキン６の保持構造を２物品による挾持構造と
したことに由来するものであシ、またこの様な２物品組
合せ方式ではパツキン６の装着作業性から見ても煩雑さ
を伴ない都合の悪いものであった。This is due to the fact that the holding structure of the seal 6 is a clamping structure using two articles, and this method of combining two articles is not complicated and convenient in terms of the workability of attaching the seal 6. It was bad.
そこで本発明者等は、合成樹脂製弁体の射出成形に当た
ってパツキンの一部を弁体内に埋設させることができれ
ばパツキンの離脱が防止されると共に、組立作業の不便
が解消されるのではないかと考え種々研究したところ以
下に示す様な射出成形法を提供し得ることとなった。Therefore, the present inventors thought that if a part of the seal could be buried within the valve body during injection molding of a synthetic resin valve body, it would be possible to prevent the seal from coming off and eliminate the inconvenience of assembly work. After much thought and research, we were able to provide the injection molding method shown below.
即ち上記問題点を解決し得た本発明の構成とは弁体嵌合
部及びシール用リップ部からなるシール用硬質パツキン
の該弁体嵌合部を合成樹脂製弁体に嵌合させる形で合成
樹脂を射出成形するに当たり、硬質パツキンを全屋内周
面で把持位置決めさせておき、キャビティ内に突出した
前記弁体嵌合部の一部に形成されているアンダーカット
部に合成樹脂を流入させて弁体嵌合部を合成樹脂材中に
埋め込むことを要旨とするものである。That is, the structure of the present invention that can solve the above problem is that the valve body fitting part of a hard sealing packing consisting of a valve body fitting part and a sealing lip part is fitted into a synthetic resin valve body. When injection molding a synthetic resin, a hard gasket is gripped and positioned on the entire inner circumferential surface, and the synthetic resin is flowed into an undercut portion formed in a part of the valve body fitting portion that protrudes into the cavity. The gist of this method is to embed the valve body fitting portion in a synthetic resin material.
本発明の射出成形法によれば弁体の成形と同時にパツキ
ンの埋込みが行なえるので、パツキン自体の離脱防止形
状はさして複雑なものとする必要がない。そしてパツキ
ンの一部が弁体内にインサート成形された状態となるの
で、パツキンと弁体の一体性が柩めて高くなシ弁体の開
閉操作時や本体内からの水圧によってノ（ツキンが離脱
することはない。また弁体全体も一物品構造として成形
されるので、組立て時の不便さがなくなるだけでなく、
弁体自身のがたつきも解消され弁としての機能が大幅に
向上する。According to the injection molding method of the present invention, the packing can be embedded at the same time as the valve body is molded, so the shape of the packing itself to prevent separation does not need to be very complicated. Since a part of the seal is insert-molded inside the valve body, the integrity of the seal and the valve body is very high.When the valve body is opened or closed, or due to water pressure from within the main body, the seal may become detached. In addition, since the entire valve body is molded as one piece, it not only eliminates the inconvenience during assembly, but also
The looseness of the valve body itself is also eliminated, and its function as a valve is greatly improved.
以下本発明の弁体成形方法を図面に基づいて説明する。 The valve body molding method of the present invention will be explained below based on the drawings.
第１図は本発明の成形方法によって得られる弁体を示す
一部破断側面図で、ノクツキン６の嵌合部（インサート
部）６ａをヘッド部１０内にインサートさせると共に、
パツキン６のシール部（リップ部）６ｂをヘッド部１０
の外周側へ突出させる様になっておシ、嵌合部６ａはヘ
ッド部１０に形成した離脱防止用凸線１０ａＫよって安
定的に把持される。従ってパツキン６とヘッド部１０は
離脱防止用凸線１０ａによって抱き込まれた状態となシ
、両者の一体性は極めて高くなシ、しかもヘッド部１０
自体が一体型である為、弁体の開閉操作時等におけるパ
ツキン６の前記離脱事故は完全に防止される。FIG. 1 is a partially cutaway side view showing a valve body obtained by the molding method of the present invention, in which the fitting part (insert part) 6a of the nokutsukin 6 is inserted into the head part 10,
The seal part (lip part) 6b of the packing 6 is attached to the head part 10.
The fitting portion 6a is stably held by a detachment prevention convex line 10aK formed on the head portion 10. Therefore, the seal 6 and the head part 10 are held together by the protruding wire 10a for preventing detachment, and the integrity of the two is extremely high.
Since the valve itself is integrated, the above-mentioned detachment accident of the gasket 6 during opening/closing operations of the valve body is completely prevented.
この様な弁体を成形するに当たって本発明では、以下に
示す如き手順によって成形を行なう。即ち第２〜４図は
本発明に係る射出成形法を例示的に説明するもので、射
出成形金ｆｉｌｌは固定金型１２と移動金型１３からな
シ、両者の間に形成されたキャビティ１４内に加熱溶融
状態の合成樹脂材を射出して弁体を成形するが、射出成
形に際してはまずキャビティ１４内ｔＣＷ質のパツキン
６を配置しておく、パツキン６の配置に当たっては固定
金型１２と移動金型１３０間に形成されるリップ把持部
１５によってパツキン６のリップ部６ｂを把持せしめる
。こうしてリップ部６ｂの外周側を射出成形金型１１で
把持するが、パツキン６の嵌合凹部６ｃはキャピテイ１
４内に開放される様に把持されておらなければならない
。尚本実施例では射出時に樹脂が把持部に進入すること
を防止するためにパツキン６のリップ部６ｂの厚みｔを
金型結合時の把持空間Ｔの寸法よシ大きくしている。ま
たパツキン６は射出時の樹脂圧による変形を防ぐため、
硬度は７０〜８０Ｈｓとされておシ、把持長！はパツキ
ンの突出長さしのい以上とされている。こうしてパツキ
ン６が把持されると固定金型１２のゲート部１６から合
成樹脂材を圧入する。In the present invention, such a valve body is molded according to the following procedure. That is, FIGS. 2 to 4 exemplarily explain the injection molding method according to the present invention, and the injection mold fill consists of a fixed mold 12 and a movable mold 13, and a cavity 14 formed between them. The valve body is molded by injecting a heated molten synthetic resin material into the cavity 14. During injection molding, a tCW quality packing 6 is first placed inside the cavity 14. When placing the packing 6, the fixed mold 12 and The lip portion 6b of the gasket 6 is gripped by the lip grip portion 15 formed between the movable molds 130. In this way, the outer peripheral side of the lip part 6b is gripped by the injection mold 11, but the fitting recess 6c of the packing 6 is
It must be held in such a way that it can be opened within 4. In this embodiment, the thickness t of the lip portion 6b of the packing 6 is made larger than the dimension of the gripping space T when the molds are connected in order to prevent the resin from entering the gripping portion during injection. In addition, the packing 6 is designed to prevent deformation due to resin pressure during injection.
The hardness is said to be 70-80Hs, and the grip length! is said to be longer than the protrusion length of Patsukin. When the packing 6 is gripped in this manner, a synthetic resin material is press-fitted from the gate portion 16 of the fixed mold 12.
キャビティ内に圧入された溶融樹脂はキャビティ１４内
へ突出している。嵌合部６ａ及び嵌合凹部６ｃの裏側へ
も回シ込んでからこれらを包み込む様に充填させる、尚
固定金型１２に形成される凸条１７は射出後の溶融樹脂
材の放熱効果を高めるものであシ、パツキン６への熱の
影響を少くしている。こうして溶融樹脂材がキャビティ
１４内で冷却固化すると第３図にホす様に移動金型１３
を白抜矢印方向へ移動させて金型１１を離型する。The molten resin press-fitted into the cavity protrudes into the cavity 14. It is also inserted into the back side of the fitting part 6a and the fitting recess 6c, and then filled so as to wrap them.The protruding stripes 17 formed on the fixed mold 12 enhance the heat dissipation effect of the molten resin material after injection. It is a monochrome material, which reduces the effect of heat on Patsukin 6. When the molten resin material cools and solidifies in the cavity 14, the mold 13 moves as shown in FIG.
is moved in the direction of the white arrow to release the mold 11.
上記の様に溶融樹脂はキャビティ内で冷却されるので、
移動金型１３のコアビン１３ａを取シ囲む様に射出され
た樹脂材が冷却時に受けた収縮力によってコアビン１３
ａを強く抱き締める。従って移動金型１３を白抜き矢印
方向へ移動させるとヘッド部１０は；アビン１３ａを抱
き締めたｔまになっているので、移動金型」３と共に移
動して固定金型１２から脱型する。次いで第４図に示す
様に突出プレート１９を移動させて突出ピン１９ａでヘ
ッド部１０を突き出し、移動金型１３からヘッド部１０
を取）出す。こうして射出成形されたヘッド部１０には
嵌合凹部６ｃと離脱防止用凸線１０ａの嵌合によってパ
ツキン６が安定的に把持される。またヘッド部１０が２
物品の完全嵌合体として形成されているので、パツキン
６の嵌合状態は長期にわたって安定・維持される。As mentioned above, the molten resin is cooled inside the cavity, so
The resin material injected so as to surround the core bin 13a of the movable mold 13 is compressed by the shrinkage force received during cooling.
Hug A tightly. Therefore, when the movable mold 13 is moved in the direction of the outlined arrow, the head portion 10 is at a position where it is hugging the abin 13a, so that it moves together with the movable mold 3 and is removed from the fixed mold 12. Next, as shown in FIG. 4, the protruding plate 19 is moved to protrude the head part 10 with the protruding pin 19a, and the head part 10 is removed from the movable mold 13.
take out). The gasket 6 is stably held in the injection-molded head portion 10 by fitting the fitting concave portion 6c and the detachment prevention convex wire 10a. In addition, the head portion 10 is
Since it is formed as a completely fitted body of articles, the fitted state of the packing 6 is stable and maintained over a long period of time.
本発明は以上の様に構成、されているので、弁体とパツ
キンの一体性が極めて高く、弁体の開閉操作や弁体内か
らかかる水圧等によってパツキンが離脱するようなこと
はない。また弁体の成形時にパツキンの一部をキャビテ
ィ内に配置してパツキンの一部が弁体内にインサートさ
れる様に射出成形するので、従来の様に弁体成形後にパ
ツキンをわざわざ嵌合させる様な手間がなくなシ、弁体
製造時間を大幅に短縮することができる。Since the present invention is configured and implemented as described above, the integrity of the valve body and the packing is extremely high, and the seal will not come off due to opening/closing operations of the valve body or water pressure applied from the valve body. Also, when molding the valve body, part of the gasket is placed in the cavity and injection molded so that part of the gasket is inserted into the valve body, so there is no need to go to the trouble of fitting the gasket after molding the valve body as in the conventional method. This eliminates the hassle and significantly reduces the valve body manufacturing time.
第１図は本発明の成形方法によって得られる弁体を示す
一部切除側面図、第２図〜第４図は本発明の成形方法を
示す一部切除側面図、第５図は公知の弁体を示す断面図
である。FIG. 1 is a partially cutaway side view showing a valve body obtained by the molding method of the present invention, FIGS. 2 to 4 are partially cutaway side views showing the molding method of the present invention, and FIG. 5 is a partially cutaway side view showing a valve body obtained by the molding method of the present invention. It is a sectional view showing a body.
Claims (1)
パッキンの該弁体嵌合部を合成樹脂製弁体に嵌合させる
形で合成樹脂を射出成形するに当たり、硬質パッキンを
金型内周面で把持位置決めさせておき、キャビティ内に
突出した前記弁体嵌合部の一部に形成されているアンダ
ーカット部に合成樹脂を流入させて弁体嵌合部を合成樹
脂材中に埋め込むことを特徴とする弁体成形方法。When injection molding synthetic resin so that the valve body fitting part of the sealing hard packing consisting of the valve body fitting part and the sealing lip part fits into the synthetic resin valve body, the hard packing is attached to the inner periphery of the mold. embedding the valve body fitting part in the synthetic resin material by letting synthetic resin flow into an undercut part formed in a part of the valve body fitting part protruding into the cavity; A valve body forming method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25072884A JPS61127322A (en) | 1984-11-27 | 1984-11-27 | Molding method of valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25072884A JPS61127322A (en) | 1984-11-27 | 1984-11-27 | Molding method of valve body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61127322A true JPS61127322A (en) | 1986-06-14 |
| JPH0352328B2 JPH0352328B2 (en) | 1991-08-09 |
Family
ID=17212160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25072884A Granted JPS61127322A (en) | 1984-11-27 | 1984-11-27 | Molding method of valve body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127322A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520098A (en) * | 1978-07-27 | 1980-02-13 | Siemens Ag | Circuit device for remotely feeding repeater for communication transmission technic device |
| JPS5633635U (en) * | 1979-08-21 | 1981-04-02 | ||
| JPS5686717A (en) * | 1979-12-19 | 1981-07-14 | Mitsubishi Petrochem Co Ltd | Extrusion of metal junction plastic molded article |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54132845A (en) * | 1978-03-28 | 1979-10-16 | Sanden Corp | Heat exchanger |
-
1984
- 1984-11-27 JP JP25072884A patent/JPS61127322A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520098A (en) * | 1978-07-27 | 1980-02-13 | Siemens Ag | Circuit device for remotely feeding repeater for communication transmission technic device |
| JPS5633635U (en) * | 1979-08-21 | 1981-04-02 | ||
| JPS5686717A (en) * | 1979-12-19 | 1981-07-14 | Mitsubishi Petrochem Co Ltd | Extrusion of metal junction plastic molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0352328B2 (en) | 1991-08-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |