JPH0232976B2 - PURASUCHITSUKUKANNOKANTANKAKOHOHO - Google Patents
PURASUCHITSUKUKANNOKANTANKAKOHOHOInfo
- Publication number
- JPH0232976B2 JPH0232976B2 JP8305381A JP8305381A JPH0232976B2 JP H0232976 B2 JPH0232976 B2 JP H0232976B2 JP 8305381 A JP8305381 A JP 8305381A JP 8305381 A JP8305381 A JP 8305381A JP H0232976 B2 JPH0232976 B2 JP H0232976B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- diameter
- tube
- plastic tube
- tube end
- 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
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
- B29C57/02—Belling or enlarging, e.g. combined with forming a groove
- B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
-
- 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
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
- B29C57/02—Belling or enlarging, e.g. combined with forming a groove
- B29C57/08—Belling or enlarging, e.g. combined with forming a groove using pressure difference
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
【発明の詳細な説明】
本発明は、プラスチツク管の管端に、弾性リン
グ嵌着用のソケツト部を形成する為のプラスチツ
ク管の管端加工方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing the end of a plastic tube to form a socket portion into which an elastic ring is fitted.
第１図に示す耐震型ベルパイプのソケツト部
Paの如く、弾性リング（図示しない）を、内側
から嵌着する為の膨出部Pa1を有するプラスチツ
ク管ソケツト部を形成する場合には、同図に示す
如く、一方端部にフランジ状の隆起部１ａを持つ
第１の型１と、第２の型２及びガイド３を具える
成形型を使用する。第１の型１は、第２図に示す
如きセグメント１１が、複数箇、円形に並び割型
であつて、各セグメント１１は、円錐体１２の外
周面の軸方向溝１２ａに係合しており、円錐体１
２が軸線方向に動かされた時に半径方向に動くこ
とにより、第１の型１の縮型もしくは拡型が行わ
れる。１１ａはセグメント１１の一方端部外周面
に形成された周方向突部で、上記隆起部１ａの一
部を構成する。各セグメント１１には、更に周方
向突部１１ａの両側基部に開口する真空吸引孔１
１ｂが形成されており、該真空吸引孔１１ｂは、
配管４を介して図示しない真空ポンプに接続され
ている。なお、第１の型１及び第２の型２とも
に、図示しないヒータを内蔵している。 Socket part of earthquake-resistant bell pipe shown in Figure 1
When forming a plastic tube socket part such as Pa, which has a bulge part Pa1 for fitting an elastic ring (not shown) from the inside, a flange-like part is attached to one end as shown in the same figure. A mold comprising a first mold 1 having a raised portion 1a, a second mold 2 and a guide 3 is used. The first mold 1 is a split mold in which a plurality of segments 11 as shown in FIG. cage, cone 1
The first mold 1 is contracted or expanded by moving in the radial direction when the mold 2 is moved in the axial direction. Reference numeral 11a denotes a circumferential protrusion formed on the outer circumferential surface of one end of the segment 11, and constitutes a part of the raised portion 1a. Each segment 11 further includes vacuum suction holes 1 that open at both bases of the circumferential protrusion 11a.
1b is formed, and the vacuum suction hole 11b is
It is connected to a vacuum pump (not shown) via piping 4. Note that both the first mold 1 and the second mold 2 have a built-in heater (not shown).
ソケツト部Paの加工に際しては、第１の型１
を、第２の型２の外径d2より大きい外形d1になる
まで拡径せしめてから、予め加熱して軟化せしめ
たプラスチツク管Ｐを、ガイド３を介し第１の型
１上に、その管端の所定長が第２の型２側え出る
まで押し嵌める。次いで、真空ポンプを駆動して
真空吸引孔１１ｂ、に負圧を作用させることによ
り、隆起部１ａにプラスチツク管Ｐを密接させて
膨出部Pa1を形成せしめるが、プラスチツク管Ｐ
の加熱温度を低い場合には、真空引きを行つて
も、隆起部１ａの後方部分ｘではプラスチツク管
Ｐが吸引変形して隆起部１ａに密着するが、前方
部分では、管端が閉塞されていない為にプラスチ
ツク管Ｐに対して真空吸引力が作用せず、この
為、第１図に点線で示す如く変形せず、膨出部
Pa1が得られない。しかし、加熱温度を高くする
と、今度は、プラスチツク管Ｐと第１の型１との
間の摺動抵抗が大きくなつて、プラスチツク管Ｐ
を成形型に押し嵌める途中で、座屈ａが生じ、成
形不能となるという問題があつた。 When processing the socket part Pa, the first mold 1
is expanded in diameter until it has an outer diameter d 1 larger than the outer diameter d 2 of the second mold 2, and then a plastic tube P that has been preheated and softened is placed on the first mold 1 via the guide 3. The tube end is pushed into the second mold 2 until a predetermined length thereof protrudes toward the second mold 2 side. Next, by driving the vacuum pump to apply a negative pressure to the vacuum suction hole 11b, the plastic tube P is brought into close contact with the raised portion 1a to form the bulged portion Pa1 .
When the heating temperature is low, even if vacuum is applied, the plastic tube P is deformed by suction at the rear part x of the raised part 1a and comes into close contact with the raised part 1a, but in the front part, the tube end is not closed. Because there is no vacuum suction force acting on the plastic tube P, it does not deform as shown by the dotted line in Figure 1, and the bulge part
I can't get Pa 1 . However, when the heating temperature is increased, the sliding resistance between the plastic tube P and the first mold 1 increases, and the plastic tube P
There was a problem in that buckling a occurred during the process of pushing and fitting into the mold, making molding impossible.
本発明は、上記した従来の問題点に鑑みてなさ
れたもので、プラスチツク管を成形型へ嵌める作
業を、第１の型を拡径してこれに嵌める工程と、
第１の型を縮径して第２の型まで送る工程の２段
階に分けることにより、プラスチツク管の管端が
第２の型に外接するようにプラスチツク管を成形
型へ嵌め得るようにし、次いで第１の型を拡径し
て真空引きをする構成とすることによつて、従来
に比し、プラスチツク管の加熱温度の許容範囲が
広く、所定形状のソケツト部を歩留りよく成形す
ることができるプラスチツク管の管端加工方法を
提供することを目的とする。 The present invention has been made in view of the above-mentioned conventional problems, and includes the step of fitting a plastic tube into a mold by expanding the diameter of a first mold and fitting it into the mold.
By dividing the first mold into two stages of reducing the diameter and sending the plastic pipe to the second mold, the plastic tube can be fitted into the mold so that the end of the plastic tube circumscribes the second mold, Next, by enlarging the diameter of the first mold and evacuating it, the allowable range of heating temperature for the plastic tube is wider than in the past, making it possible to mold a socket portion of a predetermined shape with a high yield. The purpose of the present invention is to provide a method for processing the ends of plastic pipes.
以下、本発明の一実施例を図について説明す
る。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第３図イ〜ニは、ソケツト部の加工方法を工程
順に示したものである。先づ、イに示す如く、第
１の型１を、隆起部１ａの外径が第２の型２の外
径より所定長大きくなるまで拡径しておいて、予
熱したプラスチツク管Ｐの管端部を、ガイド３を
介して第１の型１に押し嵌める。この押し嵌め作
業は、上記管端部が、隆起部１ａの一部例えば頂
部近傍にかゝつたところで止める。次いで、同図
ロの如く、第１の型１を、隆起部１ａの外径が、
第２の型２の外径と少くとも同じになるまで、縮
径せしめた後、プラスチツク管Ｐを、更に、第２
の型２側へ送る。この場合、隆起部１ａの頂部と
第２の型２との間の距離は小さいので、プラスチ
ツク管Ｐの管端は、円滑に隆起部１ａから第２の
型２へ移る。同図ロに点線で示す如く、上記管端
部の端部分P′aの所定長が、第２の型２に外嵌さ
れると、再び第１の型１を、同図ハに示す如く、
拡径する。この間、上記端部分P′aは第２の型２
で閉塞された状態を保つ。この再度の拡径が終る
と、前記した真空引きを行うが、上記したよう
に、端部分P′aが閉塞されているので、管端部
の、隆起部１ａと第２の型２の間の部分にも真空
吸引力Ｆが作用する。従つて、第２の型２に端部
分P′aが外接した状態で第１の型１の全周面にプ
ラスチツク管Ｐが外接するので、ソケツト部Pa
が成形される。次いで、このソケツト部Paを水
冷硬化せしめた後、第１の型１を緒径して、ソケ
ツト部Paを成形型からはずす。 Figures 3A to 3D show the method of processing the socket portion in the order of steps. First, as shown in A, the diameter of the first mold 1 is expanded until the outer diameter of the raised portion 1a becomes larger than the outer diameter of the second mold 2 by a predetermined length, and the preheated plastic tube P is heated. The end portion is pushed into the first mold 1 via the guide 3. This push-fitting operation is stopped when the tube end is near a portion of the raised portion 1a, for example, near the top. Next, as shown in FIG.
After reducing the diameter until it becomes at least the same as the outer diameter of the second mold 2, the plastic tube P is further
Send it to the mold 2 side. In this case, since the distance between the top of the raised part 1a and the second mold 2 is small, the tube end of the plastic tube P smoothly transfers from the raised part 1a to the second mold 2. As shown by the dotted line in FIG. ,
Expand the diameter. During this time, the end portion P'a is transferred to the second mold 2.
keep it closed. When this second diameter expansion is completed, the vacuum is drawn as described above, but since the end portion P′a is closed as described above, the space between the raised portion 1a and the second mold 2 at the tube end is The vacuum suction force F also acts on the part. Therefore, since the plastic pipe P is circumscribed on the entire circumferential surface of the first mold 1 with the end portion P′a circumscribing the second mold 2, the socket portion Pa
is formed. Next, after this socket part Pa is water-cooled and hardened, the first mold 1 is removed and the socket part Pa is removed from the mold.
なお、上記実施例では、第１の型と再度拡径し
た後に、真空引きを行つているが、拡径しなが
ら、真空引きを行つても同じ効果が得られること
は明らかである。 Incidentally, in the above embodiment, evacuation is performed after expanding the diameter of the first mold again, but it is clear that the same effect can be obtained even if evacuation is performed while expanding the diameter.
以上の如く、本発明によれば、プラスチツク管
端部を、成形型に嵌める場合に、２段階に分け、
第１の型を拡径せしめて、該第１の型に管端部を
嵌めた後、一旦縮径して第２の型に管端部の端部
分を嵌め、再び上記第１の型を拡径せしめるよう
にしたことにより、上記端部分を上記第２の型で
閉塞したまゝ、上記再度の拡径が行われ、真空引
きを行うと、上記端部分にも真空吸引力が作用す
るので、上記管端部の加熱温度が多少低くゝても
所望形状のソケツト部を得ることができ、加熱温
度の許容範囲が従来に比して広くなるので、歩留
りよく、経済的にソケツト部を成形加工すること
ができる。 As described above, according to the present invention, when fitting the end of a plastic tube into a mold, it is divided into two stages,
After expanding the diameter of the first mold and fitting the pipe end into the first mold, the diameter is once reduced and fitting the end portion of the pipe end into the second mold, and then the first mold is fitted again. By expanding the diameter, the diameter is expanded again while the end portion is closed with the second mold, and when vacuuming is performed, the vacuum suction force also acts on the end portion. Therefore, even if the heating temperature of the tube end is somewhat low, a socket of the desired shape can be obtained, and the allowable range of heating temperature is wider than before, so the socket can be formed economically with high yield. Can be molded.
第１図は、従来のプラスチツク管々端加工装置
の成形型の半部側面図、第２図は上記成形型の半
部縦断面図、第３図イ〜ニは、本発明によるプラ
スチツク管々端加工方法を説明する為の図であ
る。
１…第１の型、１ａ…隆起部、２…第２の型、
３…ガイド、１１…セグメント、１１ａ…周方向
突部、１１ｂ…真空吸引孔。
FIG. 1 is a side view of a half of a mold of a conventional plastic pipe end processing device, FIG. 2 is a longitudinal sectional view of a half of the mold, and FIGS. It is a figure for demonstrating the edge processing method. 1... First mold, 1a... Protuberance, 2... Second mold,
3... Guide, 11... Segment, 11a... Circumferential protrusion, 11b... Vacuum suction hole.
Claims (1)
在な第１の型にプラスチツク管の管端部を押し嵌
め、上記第１の型の上記一方端側に同軸に連続配
置された第２の型上に上記管端部の端部分所定長
を臨ませた後、真空引きを行つて環状膨出部を持
つソケツト部を形成する場合において、上記第１
の型を拡径せしめて該第１の型に、上記管端部を
上記隆起部の一部にかゝるまで押し嵌め、次いで
一旦縮径せしめた後、上記管端部を上記第２の型
側へ送つて該管端部所定長を上記第２の型に外接
させ、上記第１の型を再度拡径させ、上記真空引
きを行うことを特徴とするプラスチツク管の管端
加工方法。1. The tube end of the plastic tube is force-fitted into a first mold which has a circumferential protuberance on one end and is capable of expanding and contracting in diameter. In the case where a predetermined length of the end portion of the tube end portion is exposed on the second mold, and a vacuum is applied to form a socket portion having an annular bulge portion, the first mold is
The diameter of the mold is expanded, and the tube end is pushed into the first mold until it is over a part of the raised portion.Then, after the diameter is once reduced, the tube end is inserted into the second mold. A method for processing the end of a plastic tube, comprising: sending the tube end to the mold side, circumscribing the predetermined length of the tube end on the second mold, expanding the diameter of the first mold again, and performing the evacuation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8305381A JPH0232976B2 (en) | 1981-05-29 | 1981-05-29 | PURASUCHITSUKUKANNOKANTANKAKOHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8305381A JPH0232976B2 (en) | 1981-05-29 | 1981-05-29 | PURASUCHITSUKUKANNOKANTANKAKOHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57197122A JPS57197122A (en) | 1982-12-03 |
| JPH0232976B2 true JPH0232976B2 (en) | 1990-07-24 |
Family
ID=13791445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8305381A Expired - Lifetime JPH0232976B2 (en) | 1981-05-29 | 1981-05-29 | PURASUCHITSUKUKANNOKANTANKAKOHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0232976B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031948A (en) * | 1983-07-29 | 1985-02-18 | Sekisui Chem Co Ltd | Molding equipment for diameter-widened port section of synthetic-resin tube body |
| JPH0615206B2 (en) * | 1985-06-19 | 1994-03-02 | 三菱樹脂株式会社 | Mouth forming mold |
-
1981
- 1981-05-29 JP JP8305381A patent/JPH0232976B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57197122A (en) | 1982-12-03 |
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