JPS60166437A - Manufacture of hollow annular body - Google Patents

Manufacture of hollow annular body

Info

Publication number
JPS60166437A
JPS60166437A JP59023306A JP2330684A JPS60166437A JP S60166437 A JPS60166437 A JP S60166437A JP 59023306 A JP59023306 A JP 59023306A JP 2330684 A JP2330684 A JP 2330684A JP S60166437 A JPS60166437 A JP S60166437A
Authority
JP
Japan
Prior art keywords
groove body
recessed groove
annular recessed
temperature
hot plate
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
Application number
JP59023306A
Other languages
Japanese (ja)
Other versions
JPS6255972B2 (en
Inventor
Hideo Obata
小幡　英夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59023306A priority Critical patent/JPS60166437A/en
Publication of JPS60166437A publication Critical patent/JPS60166437A/en
Publication of JPS6255972B2 publication Critical patent/JPS6255972B2/ja
Granted legal-status Critical Current

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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror
    • B29C65/203—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror being several single mirrors, e.g. not mounted on the same tool
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/547—Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles, e.g. endless tubes
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00—Hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7096—Rings or ring-like articles
    • B29L2031/7102—Toroidal articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To prevent the leakage of air, and to obtain a hollow annular body having high airtightness by putting an aqueous solution into an annular recessed groove body before thermal welding and obviating the temperature rise of internal air due to a hot plate. CONSTITUTION:A proper quantity of an aqueous solution 5 is injected into an annular recessed groove body 4, an upper surface thereof is opened. A hot plate 6 is applied to an opening section in the annular recessed groove body 4 while an opening edge in an annular recessed groove body 7, an opening section thereof is directed downward, is pressure-welded to the upper surface of the hot plate 6. Heat energy from the hot plate 6 entering air in the annular recessed groove body 4 is absorbed to the aqueous solution 5, and the temperature of air is not elevated so much. The temperature of internal air is elevated in the annular recessed groove body 7. In the worst case, one part of the annular recessed groove body 7 is spread and internal air escapes to the outside, and the temperature of a synthetic resin at a position where internal air leaks drops, but the reverse side opposite to one part of the groove body 7 sufficiently compensates the temperature. The opening edges of the annular recessed groove body 4 and the annular recessed groove body 7 are butted, and the annular recessed groove bodies are pressed down, thus obtaining a hollow annular body 8 having airtightness.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、王に家庭用電気製品、たとえば洗濯機やジュ
ーサ等の回転バランサーとして使用されている中空環状
体の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a hollow annular body which is commonly used as a rotational balancer in household electrical appliances, such as washing machines and juicers.

従来レリの構成とその簡題点 従来、この種の中空環状体は上下２つに分割した合成樹
脂製の２つの環状凹溝体の開口縁溶着して形成している
。そりでその製造方法は寸ず、第１図ａに示すように夫
々の環状凹溝体１，２０開ロ部に、熱板３を圧接する。Conventional Reli Structure and Problems Conventionally, this type of hollow annular body has been formed by welding the opening edges of two annular groove bodies made of synthetic resin that are divided into upper and lower halves. The manufacturing method is as follows: As shown in FIG. 1a, a hot plate 3 is pressed into contact with the opening of each annular groove body 1, 20.

このとき、熱板３に接した開口縁は０．３〜０．７ｍｍ
位溶けるように設定てれている。At this time, the opening edge in contact with the hot plate 3 is 0.3 to 0.7 mm.
It is set to melt.

次に、同図すに示すように夫々の環状凹溝体１゜２より
熱板３を取り外し、短時間のうちに、環状凹溝体１，２
の開口縁をつき合わす。さらに同図Ｃに示すように環状
凹溝体１，２全つき合わせた後、開口縁のつき合せ面で
の結合を行なうために夫々の環状凹溝体１，２を押えて
いる。なお押えしるに約０．３〜０．６程度である。Next, as shown in the figure, the hot plate 3 is removed from each of the annular groove bodies 1 and 2, and within a short time,
The edges of the openings meet. Further, as shown in Figure C, after the annular groove bodies 1 and 2 are all butted together, the respective annular groove bodies 1 and 2 are held down in order to connect the abutting surfaces of the opening edges. The pressing force is about 0.3 to 0.6.

しかしながら、この製造方法において問題となるのは次
の点である。However, problems with this manufacturing method are as follows.

すなわち、夫々の環状凹溝体１，２の開口縁を熱板３で
溶かすとき、熱板３の表面温度は環状凹溝体１，２０合
成樹脂材料（一般にはポリプロピレンが使用される）の
溶融温度よυも高い１６０°Ｃ〜２００°Ｃ位にする必
要がある。That is, when the opening edges of the respective annular groove bodies 1 and 2 are melted by the hot plate 3, the surface temperature of the hot plate 3 is equal to the melting temperature of the annular groove bodies 1 and 20 and the synthetic resin material (generally polypropylene is used). It is necessary to set the temperature to 160°C to 200°C, which is also high.

熱板３がこのように高い温度であると、当然それに接す
る環状凹溝体１，２内の空気も温度が上昇して内部の空
気圧も上昇する。前記内部の空気圧の上昇が大きすぎる
と、熱Ｖ１３と環状凹溝体１または２の開口縁の接触面
の一部を押し拡げて内部空気が外に逃げてしまう。こう
いう現象が生じると事実上、熱板３と環状凹溝体１，２
の接触が損なわれることになり、その部分だけ合成樹脂
の溶融温度が下がることになる。When the hot plate 3 is at such a high temperature, the temperature of the air in the annular groove bodies 1 and 2 that are in contact with it also rises, and the air pressure therein also rises. If the increase in the internal air pressure is too large, a part of the contact surface between the heat V13 and the opening edge of the annular groove body 1 or 2 will be pushed open, and the internal air will escape to the outside. When such a phenomenon occurs, the hot plate 3 and the annular groove bodies 1 and 2 are effectively damaged.
The contact between the parts will be impaired, and the melting temperature of the synthetic resin will be lowered in that area.

この状態で、環状凹溝体１，２をつき合わしたとき、も
し環状凹溝体１の空気もれが生じた箇所と、環状凹溝体
２の空気もれが生じた箇所とが異なった所にあった場合
、お互いの熱保有量によって相手側の溶融温度外を補な
って最終的な熱溶着が可能であることは実験的に碓かめ
られている。In this state, when the annular groove bodies 1 and 2 are brought together, if the place where the air leakage occurs in the annular groove body 1 and the place where the air leakage occurs in the annular groove body 2 are different. It has been experimentally confirmed that when the two materials are in the same position, the amount of heat retained by both materials compensates for the temperature outside the melting temperature of the other material, and the final thermal welding is possible.

しかし、夫々の空気もれが生じた箇所が相対応した場合
には、お互いの溶融温ＪＷが低いため、その箇所での熱
溶着が不完全となり、気密性を必要とする中空環状体と
しての機能を果せなくなるという問題を有していた。However, if the locations where air leaks occur correspond to each other, the melting temperatures JW of each are low, so thermal welding at those locations will be incomplete, and the hollow annular body, which requires airtightness, will The problem was that it could no longer function properly.

発明の目的 本発明は、このような従来の問題に留意し、合成樹脂製
の２つの環状凹溝体を熱溶着して中空環状体を形成する
製造方法において、安定した熱溶着によって気密性の高
い中空環状体を得る製造法を提供することを目的とする
ものである。Purpose of the Invention The present invention takes these conventional problems into consideration, and provides a manufacturing method for forming a hollow annular body by thermally welding two annular groove bodies made of synthetic resin. The object of the present invention is to provide a manufacturing method for obtaining a tall hollow annular body.

発明の構成 上記目的を達成するために、本発明はあらかじめ合成樹
脂製の環状凹溝体の中に適当量の水溶液金入れた後開口
部に熱ｍｔ当ててその開口縁を溶かし、前記開口縁が溶
けた２つの環状凹溝体を熱溶着する製造法としたもので
あり、気密性の高い中空環状体を提供することができる
ものである。Structure of the Invention In order to achieve the above-mentioned object, the present invention involves placing an appropriate amount of aqueous gold in an annular groove made of synthetic resin in advance, applying heat to the opening to melt the opening edge, and melting the opening edge. This is a manufacturing method in which two melted annular groove bodies are thermally welded, and it is possible to provide a hollow annular body with high airtightness.

実施例の説明 以下、添イ」図面に基づき本発明の一実施例を説明する
。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

第２図は本発明の工程図を示している。FIG. 2 shows a process diagram of the present invention.

まず、同図ａのように上面を開口した環状凹溝体４の中
に適当量の水溶液６を注入する。この後、熱板６を環状
凹溝体４との開口部に当てるとともに前記熱′ｊＪｊ、
６の上面に開口部を下向きにした環状凹溝体７の開口縁
全圧接する。このとき熱板６に接している開口縁は０．
３〜０．７市位溶けるよう設ボされている。First, an appropriate amount of aqueous solution 6 is poured into an annular groove body 4 whose upper surface is open as shown in FIG. After that, the hot plate 6 is applied to the opening with the annular groove body 4, and the heat 'jJj,
The opening edge of the annular groove body 7 with the opening facing downward is fully pressed against the upper surface of the groove body 6. At this time, the opening edge in contact with the hot plate 6 is 0.
It is designed to dissolve 3 to 0.7 degrees.

このとき熱＠６の温度は１６０°〜　２００′Ｃ位にな
っているため、それに接する環状凹溝体４および環状凹
溝体Ｔ内の空気の温度が上がる。しかし環状凹溝体４の
中には熱容量の大きい水溶液６があるため、環状凹溝体
４の中の空気に入ってぐる熱板６からの熱エネルギーは
、空気と接する水溶液６に吸収されてしまい、結果、空
気の温度はそれ程高くなることはなく、空気圧も余り上
がらない。したがって、従来例で見られた内部空気のも
れもほとんど発生しないことになる。At this time, the temperature of the heat@6 is about 160° to 200'C, so the temperature of the air in the annular groove body 4 and the annular groove body T that are in contact with it rises. However, since the annular groove body 4 contains an aqueous solution 6 with a large heat capacity, the thermal energy from the hot plate 6 that enters the air inside the annular groove body 4 is absorbed by the aqueous solution 6 in contact with the air. As a result, the temperature of the air does not rise that high, and the air pressure does not rise too much. Therefore, the leakage of internal air seen in the conventional example will hardly occur.

一方、環状凹溝体７の方には水溶液が在存しないため、
内部内気の温度と圧力は上昇し、最悪の場合には、環状
凹溝体７と熱板６の接触面の一部を押しひろげて、内部
空気が外に逃げてしまい、その部分の合成樹脂の溶融温
度が下がってし甘う。On the other hand, since there is no aqueous solution in the annular groove body 7,
The temperature and pressure of the internal air will rise, and in the worst case, a part of the contact surface between the annular groove body 7 and the hot plate 6 will be pushed and expanded, causing the internal air to escape to the outside and damage the synthetic resin in that area. The melting temperature of the liquid decreases.

次に、第２図すに示すように環状凹溝体４および環状凹
溝体７より熱ｆｉ１６ｆｒ取り外して短時間のうちに、
夫々の溶けた状態にある開口縁をつき合わす。Next, as shown in Figure 2, the heat filter 16fr is removed from the annular groove body 4 and the annular groove body 7, and within a short time
The edges of each melted opening are brought together.

このとき、環状凹溝体７の内気もれした箇所の合成樹脂
温度は下がっているが、それと対峙する相手側の温度は
高いままであるため十分温度を補なうことができる。At this time, although the temperature of the synthetic resin at the part of the annular groove body 7 from which internal air leaked has decreased, the temperature of the opposite side remains high, so that the temperature can be sufficiently compensated for.

さらに同図Ｃに示すように環状凹溝体４と環状凹溝体７
の開口縁をつき合わせた後、つき合わせ面での合成樹脂
どうしの結合を行なうために夫々の環状凹溝体４，７を
０．３〜０．５ｍｍ程度押えつける。Furthermore, as shown in FIG.
After abutting the opening edges, the annular groove bodies 4 and 7 are pressed down by about 0.3 to 0.5 mm in order to bond the synthetic resins together at the abutting surfaces.

以上の工程により、最終的には、気密性を有した中空環
状体８を提供することができる。Through the above steps, it is possible to finally provide the hollow annular body 8 having airtightness.

発明の効果 一層記実施１タリの説明よシ明らかなように本発明の製
造方法は熱溶着する前に環状凹溝体の中に熱容量の大き
い水浴液を入れておくため、熱板による内部空気の温度
、気圧の上昇を防止することができ、気圧上昇による空
気もれを防ぐことにより、より気密性の高い中空環状体
を得ることができる。Further Description of Effects of the Invention As is clear from the explanation in Example 1, in the manufacturing method of the present invention, a water bath liquid with a large heat capacity is placed in the annular groove body before heat welding, so that the internal air is removed by the hot plate. By preventing increases in temperature and pressure, and by preventing air leakage due to increases in pressure, a hollow annular body with higher airtightness can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ａ　、ｂ　、ｃはそれぞれ従来の中空環状体の製
造工程図、第２図ａ、ｂ、ｃはそれぞれ本発明の中空環
状体の製造工程図である。 ４・・・・・・環状凹溝体、６・・・・・・水溶液、６
・・・・・・熱板、７・・・・・・環状凹溝体、８・・
・・・・中空環状体。 代理人の氏名　弁理士　中　尾　敏　男′はが１名ＩＩ
Ｒ″ 第２図 （ＣＬ） （・ｂ）　（Ｃ）FIGS. 1A, 1B, and 1C are diagrams showing the manufacturing process of a conventional hollow annular body, respectively, and FIGS. 2A, 2B, and 2C are diagrams of the manufacturing process of the hollow annular body of the present invention, respectively. 4... Annular concave groove body, 6... Aqueous solution, 6
...Hot plate, 7...Annular concave groove body, 8...
...Hollow annular body. Name of agent Patent attorney Satoshi Nakao 1 person II
R'' Figure 2 (CL) (・b) (C)

Claims (1)

【特許請求の範囲】[Claims] ２つの合成樹脂製の環状凹溝体を素体とし、少なくとも
一方の環状凹溝体内に適当量の水溶液を注入し、前記環
状凹溝体の開口部に熱板を当接してその開口縁を溶かし
たのち、開口縁が溶けた２つの環状凹溝体の開口縁相互
を溶着すること全特徴とする中空環状体の製造方法。Two annular groove bodies made of synthetic resin are used as the base body, an appropriate amount of aqueous solution is injected into at least one of the annular groove bodies, and a hot plate is brought into contact with the opening of the annular groove body to heat the opening edge. A method for manufacturing a hollow annular body, which is characterized in that after melting, the opening edges of two annular groove bodies whose opening edges have been melted are welded to each other.
JP59023306A 1984-02-10 1984-02-10 Manufacture of hollow annular body Granted JPS60166437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59023306A JPS60166437A (en) 1984-02-10 1984-02-10 Manufacture of hollow annular body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59023306A JPS60166437A (en) 1984-02-10 1984-02-10 Manufacture of hollow annular body

Publications (2)

Publication Number Publication Date
JPS60166437A true JPS60166437A (en) 1985-08-29
JPS6255972B2 JPS6255972B2 (en) 1987-11-24

Family

ID=12106914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59023306A Granted JPS60166437A (en) 1984-02-10 1984-02-10 Manufacture of hollow annular body

Country Status (1)

Country Link
JP (1) JPS60166437A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070090752A (en) * 2006-03-02 2007-09-06 신꼬오덴끼가부시끼가이샤 Air cushion unit and production method of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070090752A (en) * 2006-03-02 2007-09-06 신꼬오덴끼가부시끼가이샤 Air cushion unit and production method of the same

Also Published As

Publication number Publication date
JPS6255972B2 (en) 1987-11-24

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