JP4251504B2 - Welding tip for crimping resin product and method for crimping resin product using the welding tip - Google Patents

Welding tip for crimping resin product and method for crimping resin product using the welding tip Download PDF

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JP4251504B2
JP4251504B2 JP2006320959A JP2006320959A JP4251504B2 JP 4251504 B2 JP4251504 B2 JP 4251504B2 JP 2006320959 A JP2006320959 A JP 2006320959A JP 2006320959 A JP2006320959 A JP 2006320959A JP 4251504 B2 JP4251504 B2 JP 4251504B2
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tip
welding
cooling
boss
cooling pin
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JP2008132682A (en
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勉 森田
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ムネカタ株式会社
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    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B29C65/607—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking the integral rivets being hollow
    • 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
    • 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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
    • B29C65/7823—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint
    • B29C65/7829—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint said distance pieces being integral with at least one 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/349—Cooling the welding zone on the welding spot
    • B29C66/3494—Cooling the welding zone on the welding spot while keeping the welding zone under pressure
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • 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

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

Description

本発明は、熱可塑性樹脂成形品へ被固定物を固定する際、熱可塑性樹脂成形品の一部に溶着ボスと称される溶着又は変形部を予め形成しておき、この溶着ボスを被固定物側の固定孔内に通してその先端を固定孔内から突き出し、この突き出した先端側を熱で溶融又は変形することにより、熱可塑性樹脂成形品に被固定物をカシメ留めする溶着装置に用いられる溶着チップ及びこの溶着チップを用いたカシメ留め方法に関するものである。   In the present invention, when fixing an object to be fixed to a thermoplastic resin molded article, a welded or deformed portion called a welding boss is formed in advance on a part of the thermoplastic resin molded article, and the welding boss is fixed. Used in a welding device that passes through the fixed hole on the object side and protrudes from the fixed hole, and then crimps the fixed object to the thermoplastic resin molded product by melting or deforming the protruding front end with heat. The present invention relates to a welding tip and a caulking method using the welding tip.

熱可塑性樹脂で成形された成形品に被固定物を固定する方法として、成形品に一体成形された溶着ボスを被固定物側に形成された固定孔に通し、次に、この固定孔から突き出た溶着ボスの先端側を溶着チップにより加熱溶融して固定孔より大きいきのこの傘のような厚肉部（カシメ部）を形成し、この厚肉部により被固定物を成形品にカシメ留めする方法が知られている。
このようなカシメ留め方法においては、被固定物の大型化、及び、重量の増大化へと展開した場合、より高い固定強度が要求される。そのため、溶着ボスを太くして厚肉部が大きくなるように工夫し、その結果広い固定面積を得て固定強度を高めるようにしている。
しかし、溶着ボスを太くすると、溶着ボスの溶融に時間がかかり、また、成形品が部分的に厚肉となるため、ヒケが生じて品質的に支障を生じる場合がある。そのため、溶着ボスの形状をその先端側の中心から有底の孔をあけたいわゆる、中空形状とすることにより、厚肉部の固定面積を確保しつつ熱量を省力化すると共に、ヒケを防止してカシメ部の強度の向上を図るカシメ留め方法が実用化されている。 As a method of fixing an object to be fixed to a molded product formed of a thermoplastic resin, a welding boss integrally formed with the molded product is passed through a fixing hole formed on the object to be fixed, and then protrudes from the fixing hole. The tip end side of the weld boss is heated and melted by a welding tip to form a thick portion (crimped portion) like a mushroom umbrella larger than the fixing hole, and the fixed portion is caulked to the molded product by the thick portion. The method is known.
In such a caulking method, a higher fixing strength is required when the fixing object is increased in size and weight. For this reason, the welding boss is made thick so that the thick part becomes large, and as a result, a wide fixing area is obtained to increase the fixing strength.
However, if the welding boss is thickened, it takes time to melt the welding boss, and the molded product is partially thick, which may cause a sink and cause quality problems. Therefore, by making the shape of the welding boss a so-called hollow shape with a hole with a bottom from the center on the tip side, it saves heat while securing the fixed area of the thick part and prevents sink marks. A caulking method for improving the strength of the caulking portion has been put into practical use.

この様な中空形状の溶着ボスの構造とカシメ例を図１１（ａ）、（ｂ）に基づいて説明する。
この図１１（ａ）、（ｂ）において、溶着チップ１は、下面に平滑な溶融面２を形成すると共に、この溶融面２の周囲に、周側壁３を形成した正面視（下面視）円形から成る。そして、この溶着チップ１には、前記溶融面２の背面から上方に、中央でスリット１ａ、１ｂにより前後に二分割された２箇所の給電部４、４ａが形成され、この給電部４、４ａの上端部の中央には、それぞれ電極部５、５ａが設けられていて、各々の給電線６、６ａの先端は、前記電極部５、５ａにそれぞれ結線された構成となっている。 A structure and caulking example of such a hollow welding boss will be described with reference to FIGS.
11 (a) and 11 (b), the welding tip 1 forms a smooth melting surface 2 on the lower surface and a circular shape in a front view (lower surface view) in which a peripheral side wall 3 is formed around the melting surface 2. Consists of. The welding tip 1 is formed with two feeding portions 4 and 4a that are divided into two front and rear portions by slits 1a and 1b at the center upward from the back surface of the melting surface 2, and the feeding portions 4 and 4a. In the center of the upper end of each, electrode portions 5 and 5a are respectively provided, and the tips of the respective power supply lines 6 and 6a are connected to the electrode portions 5 and 5a, respectively.

また、前記給電部４、４ａの上部内には、絶縁支持部材７が挿入されていて、この支持部材７の中心には、冷却エアーパイプ８が上方から突き抜けるようにして挿入され、この冷却エアーパイプ８のノズル部８ａから溶着チップ１の溶融面２の背面２ａに冷却エアーを吹きつけることにより、溶融面２及び溶融樹脂を急冷したのち、冷却エアーは排気窓１ｃ、１ｄから外に排出される構成となっている。図中９は前記電極部５、５ａ部分を含めて給電部４、４ａの上部全体を包被している絶縁カバーである。   Further, an insulating support member 7 is inserted in the upper part of the power feeding parts 4 and 4a, and a cooling air pipe 8 is inserted into the center of the support member 7 so as to penetrate from above. Cooling air is blown from the nozzle portion 8a of the pipe 8 to the back surface 2a of the melting surface 2 of the welding tip 1 to rapidly cool the melting surface 2 and the molten resin, and then the cooling air is discharged from the exhaust windows 1c and 1d. It is the composition which becomes. In the figure, reference numeral 9 denotes an insulating cover covering the entire upper portions of the power feeding portions 4 and 4a including the electrode portions 5 and 5a.

上記溶着チップ１は、樹脂基材１０側に形成した中空孔１１ａ付の溶着ボス１１を被固定物１２側に形成した固定孔１３内に通し、突き出た溶着ボス１１の先端に溶着チップ１の溶融面２を挿し当てて溶融し、溶融面２と周側壁３で囲まれた空間２ｂ内に充満させて厚肉部１４を形成し、前記冷却エアーパイプ８のノズル部８ａから溶融面２の背面２ａに冷却エアーを吹きつけて溶融面２及び厚肉部１４の冷却を行うことにより、厚肉部１４を固化させる。   The welding tip 1 passes the welding boss 11 with the hollow hole 11a formed on the resin base material 10 side through the fixing hole 13 formed on the fixed object 12 side, and the welding tip 1 of the welding tip 1 protrudes to the tip of the protruding welding boss 11. The molten surface 2 is inserted and melted, and a thick wall portion 14 is formed by filling the space 2b surrounded by the molten surface 2 and the peripheral side wall 3 from the nozzle portion 8a of the cooling air pipe 8 to the molten surface 2. Cooling air is blown to the back surface 2a to cool the melting surface 2 and the thick portion 14, thereby solidifying the thick portion 14.

このようにして従来の溶着チップ１を用いて溶着ボス１１を溶融すると、その溶融過程において、中空孔１１ａ内に残留していた空気及び樹脂から発生したガス体が底部空間１１ｂ内に圧縮されて充満し、その一部は溶融した厚肉部１４内の樹脂中に浸入し、ボイド１５となって厚肉部１４内に残留し、所謂鬆となって残り、これがカシメ強度に悪い影響を及ぼしている。
このため、中空孔１１ａ付の溶着ボス１１を用いる場合には、カシメ強度に悪い影響を及ぼすボイド１５が発生しないカシメ留め方法と、溶着チップの提供が待たれていた。 When the welding boss 11 is melted using the conventional welding tip 1 in this way, in the melting process, the gas body generated from the air and the resin remaining in the hollow hole 11a is compressed into the bottom space 11b. A part of the resin fills and melts into the molten resin in the thick wall portion 14 and remains as a void 15 in the thick wall portion 14 to remain as so-called voids, which adversely affects the caulking strength. ing.
For this reason, when using the welding boss | hub 11 with the hollow hole 11a, the provision of the crimping method and the welding tip which the void 15 which has a bad influence on crimping intensity | strength does not generate | occur | produce was awaited.

そこで、本出願人は、溶着チップの溶融面に溶着ボスの中空孔内に挿入される突出部を設け、この突出部の中心にガス体を溶着チップの外に逃がすための排気孔を形成した内容の発明を、特願２０００−３５７４２８号（特開２００２−１６０３００号）として出願した。
この発明によると、中空溶着ボス内の溶融樹脂により密閉圧縮された中空孔内底部空間に充満したガス体は排気孔から溶着チップ外へ排出されるため、ガス体の一部が溶融した厚肉部内に浸入し、ボイド１５となって残留することはない。
特開２００２−１６０３００号公報 Therefore, the present applicant has provided a protruding portion to be inserted into the hollow hole of the welding boss on the melting surface of the welding tip, and formed an exhaust hole for allowing the gas body to escape outside the welding tip at the center of the protruding portion. The invention of the contents was filed as Japanese Patent Application No. 2000-357428 (Japanese Patent Laid-Open No. 2002-160300).
According to the present invention, the gas body filled in the hollow hole inner bottom space hermetically compressed by the molten resin in the hollow welding boss is discharged from the exhaust hole to the outside of the welding tip, so that a part of the gas body is melted. It does not enter the part and remain as a void 15.
JP 2002-160300 A

しかし、前記特許文献１に記載された溶着チップの場合、突出部に形成された排気孔は細い貫通孔であるため、次の様な欠点がある。
１．中空溶着ボスの高さが低い場合、溶融された樹脂が排気孔に入り込むため排気孔が 詰まり、ガス体を排気できなくなることがある。
２．樹脂のカスなどが排気孔に入り込む場合があり、定期的なメンテナンスが必要であ る。
３．溶着チップを製造する際、排気孔の直径は０．３ｍｍ〜０．７ｍｍと小径のため、 加工に手間とコストがかかる。
４．溶融樹脂が中空孔内にずれ落ちて厚肉部のボリュームが不足して強度不足となった り、外観不良が発生したりして、十分なるカシメ強度が得られなくなる。
本発明の目的は、前記した排気孔を設ける方法ではない方法で確実に溶着ボスの中空孔内底部空間からガス体を排気することができると共に、メンテナンスが不要で、特別な加工を施すことなく中空孔内底部空間からガス体の排気を行うことができる樹脂製品のカシメ留め用の溶着チップとカシメ留め方法を提供することにある。 However, in the case of the welding tip described in Patent Document 1, since the exhaust hole formed in the protruding portion is a thin through hole, there are the following drawbacks.
1. When the height of the hollow welding boss is low, the melted resin enters the exhaust hole and the exhaust hole is clogged, and the gas body may not be exhausted.
2. Resin debris may enter the exhaust vents and regular maintenance is required.
3. When manufacturing the welding tip, the diameter of the exhaust hole is as small as 0.3 mm to 0.7 mm, so that processing takes time and cost.
4). The molten resin slips into the hollow holes and the volume of the thick part becomes insufficient, resulting in insufficient strength or poor appearance, resulting in insufficient caulking strength.
The object of the present invention is that the gas body can be reliably exhausted from the inner space of the hollow hole of the welding boss by a method other than the method of providing the exhaust hole, and maintenance is not required and no special processing is performed. An object of the present invention is to provide a welding tip and a caulking method for caulking a resin product capable of exhausting a gas body from an inner bottom space of a hollow hole.

上記目的を達成するため、請求項１に記載の発明においては、樹脂製品のカシメ留め用溶着チップにおいて、樹脂基材に有底中空孔付の溶着ボスを突設し、この溶着ボスを被固定物側に形成した固定孔内に通して溶着ボスの先端を固定孔内から突出させ、この突出した溶着ボスの先端に周側壁で囲まれた溶融面を押し当てて溶着ボスの先端を溶融し、その後急冷することにより樹脂基材に被固定物をカシメ留めするための溶着チップにおいて、この溶着チップの溶融面の中心から下向きに、先端側に向かって細くなるようにテーパーをつけ、かつその先端が前記周側壁の下縁よりも突き出るようにして冷却ピンを突設すると共に、前記溶融面の背面の中心であって、前記冷却ピンが突出している部位に、前記冷却ピンの根元の部位に喰い込むように空冷凹部を形成したことを特徴とするものである。   In order to achieve the above object, in the invention described in claim 1, in the welding tip for crimping a resin product, a welding boss with a bottomed hollow hole is projected from the resin base material, and the welding boss is fixed. The tip of the welding boss protrudes from the fixing hole through the fixing hole formed on the object side, and the tip of the welding boss is melted by pressing the molten surface surrounded by the peripheral side wall to the tip of the protruding welding boss. Then, in the welding tip for caulking the object to be fixed to the resin base material by rapid cooling, a taper is formed so as to become narrower toward the tip side downward from the center of the melting surface of the welding tip, and The cooling pin protrudes from the lower edge of the peripheral side wall and protrudes from the lower edge of the peripheral side wall. The cooling pin protrudes from the center of the rear surface of the melting surface. Bite into It is characterized in that the formation of the urchin cooling recess.

本発明の冷却ピンは、溶融面の周側壁の下端よりも突き出る長さを有している。また、冷却ピンの発熱を抑えるため出来るだけ細いピンが望ましく、例えば、溶融面の面積の３％〜１０％の底面断面部の面積を持つ冷却ピンが有効である。３％以下であれば、冷却ピンが細すぎて強度不足及び加工が難しい等の問題が生じ、１０％以上である場合は、電気抵抗が小さくなった分、加熱電流が流れて発熱する場合がある。
また、冷却ピンには、先端側に向かって細くなるテーパーをつけたことにより、先端部の温度を他の部分より低くすることができると共に、カシメ留め後、冷却ピンが溶着ボスより抜け易いという効果を得られる。
また、冷却ピンの根元と溶融面との間には、Ｒをつけたことにより、排出されるガス体をスムーズに流出させることができる。
この冷却ピンの効果により、冷却ピンに接触している部分の溶融樹脂の表面には、いち早くスキン層が形成される。したがって、冷却ピンとスキン層間に微小な隙間が生じ、この隙間を経由して溶融樹脂で密閉された底部空間内のガス体は溶融面に向かって流動し、この溶融面及び周側壁の内面及び条件によっては周側壁から外に流出する。したがって、従来の様に、厚肉部の内部へガス体が浸入して厚肉部内にボイドが形成されることがなく、カシメ留め部の強度が不足したりしない。 The cooling pin of the present invention has a length protruding beyond the lower end of the peripheral side wall of the melting surface. Further, a pin that is as thin as possible is desirable in order to suppress heat generation of the cooling pin. For example, a cooling pin having an area of the bottom cross-sectional portion of 3% to 10% of the area of the melt surface is effective. If it is 3% or less, the cooling pin is too thin, resulting in problems such as insufficient strength and difficult processing, and if it is 10% or more, the heating current may flow to generate heat due to the decrease in electrical resistance. is there.
The cooling pin has a taper that becomes narrower toward the tip side, so that the temperature of the tip can be made lower than the other parts, and after crimping, the cooling pin can be easily removed from the welding boss. The effect can be obtained.
Further, by providing R between the root of the cooling pin and the melting surface, the discharged gas body can flow out smoothly.
Due to the effect of the cooling pin, a skin layer is quickly formed on the surface of the molten resin in a portion in contact with the cooling pin. Therefore, a minute gap is generated between the cooling pin and the skin layer, and the gas body in the bottom space sealed with the molten resin flows through the gap to flow toward the melting surface. Depending on the flow from the peripheral side wall. Therefore, unlike the conventional case, the gas body does not enter the thick portion and voids are not formed in the thick portion, and the strength of the crimping portion is not insufficient.

更に、請求項２に記載の発明においては、請求項１に記載の樹脂製品のカシメ留め用溶着チップにおいて、前記溶着チップの周側壁の内周面であって、溶融面に近い位置に、絞り段部を形成したことを特徴とするものである。   Furthermore, in the invention described in claim 2, in the welding tip for crimping a resin product according to claim 1, the inner peripheral surface of the peripheral side wall of the welding tip is close to the melting surface. The step portion is formed.

周側壁の内周面に絞り段部を形成したことにより、固定面積を確保しつつ溶着チップにおける溶融面の一部と溶着ボスとの距離が縮まり、溶融面の熱が溶着ボスへ伝わり易くなる。その結果、溶着ボスの溶融が充分に行なわれ、その後固化したときに均一な厚肉部が形成される。
また、冷却時には、溶融面の表面積が増したことにより、冷却効率が向上し、冷却時間の短縮が図れる。 By forming the throttle step on the inner peripheral surface of the peripheral side wall, the distance between a part of the fusion surface in the welding tip and the welding boss is reduced while securing a fixed area, and the heat of the fusion surface is easily transmitted to the welding boss. . As a result, the welding boss is sufficiently melted, and a uniform thick portion is formed when it is solidified thereafter.
Moreover, at the time of cooling, since the surface area of the melting surface has increased, the cooling efficiency is improved and the cooling time can be shortened.

更に、請求項３に記載の発明においては、ａ．樹脂基材に有底中空孔付の溶着ボスを突設し、この溶着ボスを被固定物側に形成した固定孔内に通して溶着ボスの先端を固定孔内から突出させ、この突出した溶着ボスの先端に周側壁で囲まれた溶融面を押し当てて溶着ボスの先端を溶融することにより、固定孔の直径より大きい厚肉部を形成し、その後急冷することにより樹脂基材に被固定物をカシメ留めする溶着方法において、
ｂ．前記溶着チップの溶融面の中心から下向きに先端側に向かって細くなるようにテーパーをつけ、かつその先端が前記周側壁の下縁よりも突き出るようにして冷却ピンを突設すると共に、前記溶融面の背面の中心であって、前記冷却ピンが突出している部位に、前記冷却ピンの根元の部位に喰い込むように空冷凹部を形成した構成の溶着チップに電圧を印加して前記溶融面を発熱させる、
ｃ．次に、前記溶着チップの冷却ピンを前記中空孔内に挿入しながら溶着チップの溶融面を溶着ボスの先端に押し当てて溶着ボスの溶融又は変形を開始することにより、溶融面と周側壁により囲まれた空間及び中空孔の上部と冷却ピンの根元側との間の隙間内に溶融した樹脂を充満させる、
ｄ．前記溶融した樹脂の充満時に、発熱温度が溶融面に比較して低い冷却ピンの作用により、この冷却ピンと接する溶融した樹脂面にいち早くスキン層を生成する、
ｅ．前記スキン層の生成が先行することにより、冷却ピンの周囲においてスキン層との間に微小な隙間を形成し、この隙間を経由して溶着ボスの中空孔内の底部空間に充満しているガス体を冷却ピンの先端の突き出しにより溶融樹脂に形成された孔から溶融面側に誘導してガス体が溶融した樹脂内に浸入するのを阻止する、
ｆ．次に、電圧の印加を止めて溶融面の裏側に冷却エアーを吹きつけて溶融面の冷却を行うと同時に、冷却凹部内に冷却エアーを吹きつけることにより、冷却ピンの根元部の冷却効果を高めて、溶融樹脂の厚肉部の冷却に併せて、冷却ピンの根元部における溶融樹脂の固化を促進させる、
ｇ．次に、冷却エアーを止めて溶着チップを引き離すことにより、被固定物の外にカシメ部を形成する、
ｈ．ことを特徴とするものである。 Furthermore, in the invention according to claim 3, a. A welding boss with a bottomed hollow hole is projected on the resin base material, and the tip of the welding boss protrudes from the fixing hole through the fixing boss formed on the fixed object side. The melted surface surrounded by the peripheral wall is pressed against the tip of the boss to melt the tip of the welded boss, thereby forming a thick part larger than the diameter of the fixing hole, and then fastened to the resin substrate by rapid cooling. In the welding method for caulking objects,
b. A taper is provided so as to taper downward from the center of the melting surface of the welding tip toward the tip side, and a cooling pin is provided so that the tip protrudes from the lower edge of the peripheral side wall. A voltage is applied to a welding tip having a configuration in which an air-cooled recess is formed in the center of the back surface of the surface, and the cooling pin protrudes into a base portion of the cooling pin, thereby applying the voltage to the melting surface. Fever,
c. Next, while the cooling pin of the welding tip is inserted into the hollow hole, the melting surface of the welding tip is pressed against the tip of the welding boss to start melting or deformation of the welding boss. Filling the melted resin in the space between the enclosed space and the top of the hollow hole and the root side of the cooling pin;
d. When the molten resin is filled, a skin layer is quickly generated on the molten resin surface in contact with the cooling pin by the action of the cooling pin whose heat generation temperature is lower than that of the molten surface.
e. Gas that fills the bottom space in the hollow hole of the welding boss through the gap by forming a minute gap with the skin layer around the cooling pin as a result of the formation of the skin layer preceding. Preventing the gas body from entering the molten resin by guiding the body from the hole formed in the molten resin to the molten surface side by protruding the tip of the cooling pin,
f. Next, the application of voltage is stopped and cooling air is blown to the back side of the melt surface to cool the melt surface, and at the same time, the cooling air is blown into the cooling recess, thereby improving the cooling effect of the base portion of the cooling pin. In combination with the cooling of the thick part of the molten resin, the solidification of the molten resin at the root part of the cooling pin is promoted.
g. Next, the crimping part is formed outside the fixed object by stopping the cooling air and pulling the welding tip apart.
h. It is characterized by this.

本発明の冷却ピンの場合、溶融面に対して電流方向が直角方向となるため、電流はこの直角方向、つまり冷却ピンの先端方向には流れにくく、よって、冷却ピンにはジュール熱による発熱が発生しない。例えば、実測によると、溶着チップの溶融面の発熱温度が３００℃に達したとき、冷却ピンの根元付近での発熱温度は８５℃以下である。したがって、溶融面により加熱されて溶融した樹脂には、冷却ピンと接触している面に即座にスキン層が生成され、冷却ピンと溶融樹脂面間に微小の隙間が発生する。さらに、冷却ピンの先端は溶融樹脂から中空孔内底部空間に突き出ているため、底部空間に圧縮されて充満したガス体は冷却ピンとスキン層との隙間を通って溶接面に至り、その後周側壁の内周面を伝って外に放出され、厚肉部内にガス体が浸入することはない。
また、従来溶融した樹脂が中空孔の底部空間内にたれ落ち、厚肉部の容量が不足する場合があったが、冷却ピンによる冷却効果にて溶融樹脂の温度が適度に低下し、たれ落ちることを防止できるため、設計通りの適切な厚肉部を形成することが可能になる。 In the case of the cooling pin of the present invention, since the current direction is perpendicular to the melting surface, the current is difficult to flow in this perpendicular direction, that is, in the tip direction of the cooling pin, and therefore the cooling pin generates heat due to Joule heat. Does not occur. For example, according to actual measurement, when the heat generation temperature of the fusion surface of the welding tip reaches 300 ° C., the heat generation temperature near the root of the cooling pin is 85 ° C. or less. Therefore, in the resin heated and melted by the melting surface, a skin layer is immediately generated on the surface in contact with the cooling pin, and a minute gap is generated between the cooling pin and the molten resin surface. Furthermore, since the tip of the cooling pin protrudes from the molten resin into the bottom space in the hollow hole, the gas body compressed and filled in the bottom space reaches the welding surface through the gap between the cooling pin and the skin layer, and then the peripheral side wall The gas body is not discharged through the inner peripheral surface, and the gas body does not enter the thick portion.
In addition, the melted resin has fallen into the bottom space of the hollow hole, and the capacity of the thick wall portion may be insufficient. However, the temperature of the melted resin is moderately lowered due to the cooling effect of the cooling pin and dripping down. Therefore, it is possible to form an appropriate thick portion as designed.

更に、請求項４に記載の発明においては、請求項３に記載の樹脂基材に被固定物をカシメ留めする方法において、前記周側壁の内周面であって、溶融面側に近い位置に、絞り段部を形成した溶着チップを用いて行うことを特徴とするものである。   Furthermore, in the invention according to claim 4, in the method for caulking the object to be fixed to the resin base material according to claim 3, it is an inner peripheral surface of the peripheral side wall and is located at a position close to the melt surface side. This is performed using a welding tip in which an aperture step is formed.

１．本発明の溶着チップ及びこれを用いたカシメ留め方法によると、溶着ボスの中空孔内 底部空間に充満した圧縮されたガス体は、冷却ピンの周囲に形成されたスキン層を経由 して中空孔内底部空間から溶着チップの外に流出するため、厚肉部にガス体が浸入する のを防ぐことができる。したがって、厚肉部の内部にボイドが形成されないので、固定 強度不足が発生するのを防止することができる。
２．本発明の溶着チップ及びこれを用いたカシメ留め方法によると、溶着ピンの根元部に 位置する溶融面の背面に冷却凹部を形成したことにより、溶着ピンの根元部の冷却効率 を高めることができる。したがって、スキン層の生成を促進させることができると共に 厚肉部を中心からも冷却するため、溶融樹脂が中空孔内底部空間にずれ落ちて厚肉部の ボリュームが不足して強度が不足したり、カシメ部が変形したりせず、外観が良好で高 強度のカシメ留めを行うことができる。
３．本発明の溶着チップ及びこれを用いたカシメ留め方法によると、周側壁の内面に絞り 段部を形成したため、溶着チップの溶融面と溶着ボスとの距離が短くなり、高い熱伝導 が得られて加熱及び冷却時間を短縮できる。また、溶融面周辺の強度が増し、応力が溶 融面に集中することがないため、繰り返し行われる溶着ボスへの押圧で溶融面に変形が 発生することがなく、よって耐久性が向上する。
４．本発明の溶着チップ及びこれを用いたカシメ留め方法によると、溶着チップの冷却ピ ンが溶融樹脂から中空孔内の底部空間に突き出しているため、冷却ピンと溶融樹脂のス キン層との隙間から底部空間内に残留している圧縮されたガス体を放出することができ る。したがって、溶融樹脂内にガス体が浸入することなくカシメ留めを行うことができ る。よって、厚肉内にガス体が浸入したり、ガス体が厚肉内を不規則に流れてその痕跡 が残ったりすることが無いため、カシメ強度不足が発生したり、カシメ部の外観が損な われたりしない。 1. According to the welding tip of the present invention and the caulking method using the same, the compressed gas body filled in the hollow hole inner space of the welding boss is passed through the skin layer formed around the cooling pin to the hollow hole. Since it flows out of the welding tip from the inner bottom space, it is possible to prevent the gas body from entering the thick wall portion. Therefore, no void is formed inside the thick wall portion, and it is possible to prevent insufficient fixing strength.
2. According to the welding tip and the caulking method using the same according to the present invention, the cooling recess is formed on the back surface of the melting surface located at the root portion of the welding pin, so that the cooling efficiency of the root portion of the welding pin can be increased. . Therefore, the formation of the skin layer can be promoted and the thick part is also cooled from the center, so that the molten resin slips into the inner space of the hollow hole and the volume of the thick part is insufficient, resulting in insufficient strength. The caulking portion is not deformed, and the appearance is good and high strength caulking can be performed.
3. According to the welding tip of the present invention and the caulking method using the same, since the throttle step is formed on the inner surface of the peripheral side wall, the distance between the fusion surface of the welding tip and the welding boss is shortened, and high heat conduction is obtained. Heating and cooling time can be shortened. Further, since the strength around the molten surface is increased and the stress is not concentrated on the molten surface, the molten surface is not deformed by repeated pressing on the welding boss, thereby improving the durability.
4). According to the welding tip of the present invention and the caulking method using the same, since the cooling pin of the welding tip protrudes from the molten resin into the bottom space in the hollow hole, the gap is formed between the cooling pin and the molten resin skin layer. The compressed gas body remaining in the bottom space can be released. Therefore, it is possible to perform caulking without the gas body entering the molten resin. Therefore, the gas body does not penetrate into the thick wall, and the gas body does not flow irregularly through the thick wall and the traces do not remain, so that the caulking strength is insufficient or the appearance of the caulking portion is damaged. It is not done.

本発明に係るカシメ留め用溶着チップとカシメ留め方法の基本的な形態は、溶着チップの溶融面の中心部に、先端へ向かって細くなる冷却ピンを突設すると共に溶接面の背面の中心であって、冷却ピンの根元部に喰い込む位置まで冷却凹部を形成したことと、溶融面の周囲をとり囲むように設けた周側壁の内周面に絞り段差を形成したことにより、厚肉部内にボイドが形成されてカシメ強度が低下するのを防止し、併せて生産性の向上とカシメ部の外観を奇麗に仕上げることができる点に特徴がある。
なお、溶着チップに用いる材料は、ステンレス（ＳＵＳ）、ダイス鋼（ＳＫＤ）、鉄クロムが代表例としてあげられる。
次に、本発明の実施例を各図に基づいて詳細に説明する。 The basic form of the caulking fastening tip and the caulking fastening method according to the present invention is such that a cooling pin that narrows toward the tip is provided at the center of the melting surface of the welding tip and at the center of the back surface of the welding surface. Because the cooling recess was formed to the position where it bites into the root of the cooling pin, and the throttle step was formed on the inner peripheral surface of the peripheral side wall surrounding the melting surface, This is characterized in that voids are prevented from being formed and the caulking strength is reduced, and at the same time, productivity can be improved and the appearance of the caulking portion can be finished beautifully.
Typical examples of the material used for the welding tip include stainless steel (SUS), die steel (SKD), and iron chrome.
Next, embodiments of the present invention will be described in detail with reference to the drawings.

請求項１に記載された溶着チップの構成を図１〜図５に基づいて詳細に説明する。
図１は溶着チップを示し、図１（ａ）は正面図、図１（ｂ）は平面図、図１（ｃ）は図１（ａ）におけるＡ−Ａ´線断面図、図２は溶着チップの斜視図、図３は、溶着チップに対する給電部の説明図、図４は本発明による溶着チップを用いて組み立てが完成した溶着装置の斜視図、図５は図４の中央断面図である。
本実施例による溶着チップ１は、ステンレス材を用いて切削加工されていて、全体的には有底型の円筒形状である。溶着チップ１は、上から下に向けて大径部、中径部、小径部と３ブロックに分かれており、大径部と中径部とを通して溶着チップ１を縦に２等分するようにスリット１ａ、１ｂが形成されている。そのスリット１ａ、１ｂの小径部側端部には排気効率を高めるためスリットをさらに大きくした長方形の排気窓１ｃ、１ｄがスリット１ａ、１ｂと連続して形成されている。大径部内には、図３に示すようにセラミックから成る支持部材７が挿入されている。中径部と小径部の境には、周側壁３が形成され、その周側壁３の底面となる部位が溶融面２であって、カシメ留の際、溶着ボスの先端に溶融面２を押し当てて溶着ボス１１に熱を伝えるところである。
溶融面２の中心部には、先端に向かって細くなるようにテーパーをつけ、さらに、その先端側は、周側壁３の下端縁から突き出るように冷却ピン１６が突設されている。 The structure of the welding tip described in claim 1 will be described in detail with reference to FIGS.
1 shows a welding tip, FIG. 1 (a) is a front view, FIG. 1 (b) is a plan view, FIG. 1 (c) is a cross-sectional view taken along the line AA 'in FIG. 1 (a), and FIG. FIG. 3 is a perspective view of a chip, FIG. 3 is an explanatory view of a power feeding portion for the welding chip, FIG. 4 is a perspective view of a welding apparatus that has been assembled using the welding chip according to the present invention, and FIG. 5 is a central sectional view of FIG. .
The welding tip 1 according to the present embodiment is cut using a stainless steel material, and has a bottomed cylindrical shape as a whole. The welding tip 1 is divided into a large-diameter portion, a medium-diameter portion, and a small-diameter portion from the top to the bottom, and is divided into three blocks, and the welding tip 1 is divided into two equal parts vertically through the large-diameter portion and the medium-diameter portion. Slits 1a and 1b are formed. Rectangular exhaust windows 1c and 1d having larger slits are formed continuously with the slits 1a and 1b at the small diameter side ends of the slits 1a and 1b. A support member 7 made of ceramic is inserted into the large diameter portion as shown in FIG. A peripheral side wall 3 is formed at the boundary between the medium diameter portion and the small diameter portion, and a portion to be a bottom surface of the peripheral side wall 3 is a melt surface 2, and when the caulking is performed, the melt surface 2 is pushed to the tip of the welding boss. This is where the heat is transmitted to the welding boss 11.
A taper is provided at the center of the melting surface 2 so as to become thinner toward the tip, and a cooling pin 16 projects from the lower end of the peripheral side wall 3 at the tip.

図３において、５、５ａは電極部、６、６ａは給電線、８は冷却エアーパイプ、８ａはノズル部、図４、図５において、９は絶縁カバーであって、これらの機能は、図１１で説明した内容と同一のため、詳細な説明は省略する。
図１（ａ）、（ｂ）及び図２、図５において、１７は、溶着チップ１の溶融面２の背面２ａの中心部において、冷却ピン１６の根元１６ａの中心部位に喰い込むようにして形成された冷却凹部であって、この冷却凹部１７は、冷却ピン１６のＲのついた根元１６ａ部分の冷却効率を高めるために形成されている。なお、この冷却凹部１７は、逆円錐形状であるが、円孔でもよく、形状は凹状である限り、問わない。 3, 5 and 5a are electrode portions, 6 and 6a are feeders, 8 is a cooling air pipe, 8a is a nozzle portion, and in FIGS. 4 and 5, 9 is an insulating cover. 11 is the same as that described in FIG.
1 (a), 1 (b), 2 and 5, 17 is formed so as to bite into the central portion of the root 16a of the cooling pin 16 at the center of the back surface 2a of the melting surface 2 of the welding tip 1. The cooling recess 17 is formed in order to increase the cooling efficiency of the root 16a portion with the R of the cooling pin 16. In addition, although this cooling recessed part 17 is a reverse cone shape, a circular hole may be sufficient and it will not ask | require as long as a shape is concave.

実施例１の溶着チップ１の主要部の寸法を表１に示す。

Figure 0004251504
Table 1 shows the dimensions of the main part of the welding tip 1 of Example 1.
Figure 0004251504

冷却ピン１６は、ジュール熱による発熱を抑えるため出来るだけ細いピンが望ましく、例えば、溶融面２の面積の３％〜１０％の断面積を根元部１６ａに持つ冷却ピン１６が有効である。本実施例では約４．７％である。
この冷却ピン１６の効果により、冷却ピン１６に接触した溶融樹脂の表面は、いち早く冷却されて図７に示すようにスキン層１８が生成される。このため、冷却ピン１６とスキン層１８間に微小な隙間１９が生じ、底部空間１１ｂ内に充満したガス体はここを通って溶融面２側に流動することが可能になる。 The cooling pin 16 is desirably as thin as possible in order to suppress heat generation due to Joule heat. For example, the cooling pin 16 having a cross-sectional area of 3% to 10% of the area of the melting surface 2 at the root portion 16a is effective. In this embodiment, it is about 4.7%.
Due to the effect of the cooling pins 16, the surface of the molten resin in contact with the cooling pins 16 is quickly cooled, and a skin layer 18 is generated as shown in FIG. 7. For this reason, a minute gap 19 is generated between the cooling pin 16 and the skin layer 18, and the gas body filled in the bottom space 11 b can flow through this to the melting surface 2 side.

次に、前記カシメ留め用溶着チップ１を用いた溶着装置の組み立て方法について説明する。
図３は、組立を行なう様子を示す斜視図、図４は組立完成を示す斜視図、図５は図4における断面図である。
まず、スリット１ａ、１ｂで分割された各々の溶着チップ１の給電部４、４ａの電極部５、５ａに給電線６、６a を溶接等の方法で電気的に接続する。セラミックである支持部材７は、軸中心に挿入孔が貫通して形成されていて、ここに冷却用エアーを溶接面２の裏面２ａに吹き付けるための冷却エアーパイプ８が突き抜けるようにして挿入され、その後、支持部材７は溶着チップ１の開放された後方から大径部内に挿入され、中径部との境である位置決め段まで挿入される。
前記の様に各部材を組み込んだ後、図４に示す様に、耐熱樹脂（例えば、金属粉入りエポキシ樹脂）からなるカバー９により、溶着チップ１の一部、支持部材７、冷却エアーパイプ８及び各給電線６、６ａの一部又は全部が被覆固定されて、本実施例の溶着装置が完成する。
完成後の溶着装置の断面を図５に示す。 Next, a method for assembling a welding apparatus using the crimping welding tip 1 will be described.
3 is a perspective view showing the state of assembly, FIG. 4 is a perspective view showing completion of assembly, and FIG. 5 is a cross-sectional view of FIG.
First, the power supply lines 6 and 6a are electrically connected to the electrode parts 5 and 5a of the power supply parts 4 and 4a of each welding tip 1 divided by the slits 1a and 1b by a method such as welding. The support member 7 made of ceramic has an insertion hole formed through the center of the shaft, and is inserted so that a cooling air pipe 8 for blowing cooling air to the back surface 2a of the welding surface 2 penetrates through the hole. Thereafter, the support member 7 is inserted into the large-diameter portion from the opened rear of the welding tip 1 and is inserted to the positioning step that is the boundary with the medium-diameter portion.
After each member is assembled as described above, as shown in FIG. 4, a part of the welding tip 1, the support member 7, and the cooling air pipe 8 are covered with a cover 9 made of a heat-resistant resin (for example, an epoxy resin containing metal powder). And a part or all of each feeder 6 and 6a is coat | covered and fixed, and the welding apparatus of a present Example is completed.
FIG. 5 shows a cross section of the welding apparatus after completion.

次に、実施例１における溶着装置（溶着チップ）を用いて行う請求項３に記載したカシメ留め方法について説明する。
図６はカシメ留め方法の工程図で、（ａ）は溶着装置を溶着ボス１１の先端に押し当てる直前の図、（ｂ）は溶着チップ１を発熱させて溶着ボス１１を溶融しながら押し潰した状態の説明図、（ｃ）は冷却エアーパイプ８から冷却用エアーを溶着チップ１の溶融面２の背面２ａへ吹き付けている図、（ｄ）はカシメ留めが完成した図、図７はカシメ留め時の拡大図である。
符号の１０はＡＢＳ樹脂から成形された樹脂成形体であり、この樹脂成形体１０には有底中空孔１１a付の溶着ボス１１が突設してある。 Next, the caulking method described in claim 3 performed using the welding apparatus (welding tip) in the first embodiment will be described.
6A and 6B are process diagrams of the caulking method, wherein FIG. 6A is a view immediately before the welding apparatus is pressed against the tip of the welding boss 11, and FIG. 6B is a diagram showing that the welding tip 1 is heated to crush while melting the welding boss 11. FIG. FIG. 7C is a diagram in which cooling air is blown from the cooling air pipe 8 to the back surface 2a of the melting surface 2 of the welding tip 1, FIG. 7D is a diagram in which crimping is completed, and FIG. It is an enlarged view at the time of a stop.
Reference numeral 10 denotes a resin molded body molded from an ABS resin, and a welded boss 11 with a bottomed hollow hole 11a is projected from the resin molded body 10.

まず、図６(ａ)に示す様に、溶着ボス１１を被固定物１２側に形成した固定孔１３内に通して溶着ボス１１の先端を固定孔１３内から突出させる。次に、溶着装置における溶着チップ１の冷却ピン１６を溶着ボス１１の中空孔１１ａ内に挿入しながら、溶着チップ１の溶融面２を溶着ボス１１の先端に押し当てる。
次に、溶着チップ１に接続されている給電線６、６ａに電圧を印加すると、ジュール熱により溶融面２が発熱する。この時の温度は、溶融面２が３００℃、冷却ピン１６はその根元部１６ａにおいて８５℃である。このように発熱した溶着チップ１の溶融面２を溶着ボス１１の先端に押し付けると、溶着ボス１１は溶融し、溶融した樹脂は溶着チップ１の溶融面２と周側壁３で囲まれた空間２ｂ内に流動し、図６（ｂ）の様に空間２ｂ内に充満する。 First, as shown in FIG. 6A, the welding boss 11 is passed through the fixing hole 13 formed on the fixed object 12 side, and the tip of the welding boss 11 is protruded from the fixing hole 13. Next, the melting surface 2 of the welding tip 1 is pressed against the tip of the welding boss 11 while the cooling pin 16 of the welding tip 1 in the welding apparatus is inserted into the hollow hole 11 a of the welding boss 11.
Next, when a voltage is applied to the feeder lines 6 and 6a connected to the welding tip 1, the molten surface 2 generates heat due to Joule heat. The temperature at this time is 300 ° C. on the melting surface 2 and 85 ° C. at the root portion 16a of the cooling pin 16. When the melting surface 2 of the welding tip 1 thus heated is pressed against the tip of the welding boss 11, the welding boss 11 is melted, and the molten resin is a space 2 b surrounded by the melting surface 2 and the peripheral side wall 3 of the welding tip 1. And flows into the space 2b as shown in FIG. 6 (b).

この時、中空孔１１ａ内に流入した溶融樹脂の中心部は、冷却ピン１６の温度が低いため、この冷却ピン１６と接触している溶融樹脂面にスキン層１８がいち早く生成されて冷却ピン１６の外周面とスキン層１８間に微小隙間１９が形成される。同時に冷却ピン１６の先端が中空孔１１ａ内において溶融樹脂より底部の空間１１ｂに突き出るため、空間１１ｂと微小隙間１９が連通し、これによりカシメ留め工程時に底部空間１１ｂ内に圧縮して充満したガス体ｇは、冷却ピン１６が溶融樹脂から突き出ている部分の孔、及び微小隙間１９を経由して図７において太い線で示すように溶融面２側と接する厚肉部１４の表面側に流出することにより、厚肉部１４内にガス体ｇが浸入したり、ガス体ｇが厚肉部１４内を不規則に流れてその痕跡が残ったりない。この結果、カシメ留め部内にボイドが形成されて強度不足の問題が発生したり、美観が損なわれたりするのを防止することができる。   At this time, since the temperature of the cooling pin 16 is low at the center of the molten resin flowing into the hollow hole 11a, the skin layer 18 is quickly generated on the surface of the molten resin in contact with the cooling pin 16, and the cooling pin 16 A minute gap 19 is formed between the outer peripheral surface of the substrate and the skin layer 18. At the same time, since the tip of the cooling pin 16 protrudes from the molten resin into the bottom space 11b in the hollow hole 11a, the space 11b and the minute gap 19 communicate with each other, thereby compressing and filling the bottom space 11b in the caulking process. The body g flows out to the surface side of the thick portion 14 in contact with the molten surface 2 side as shown by the thick line in FIG. 7 through the hole where the cooling pin 16 protrudes from the molten resin and the minute gap 19. By doing so, the gas body g does not enter into the thick part 14, or the gas body g flows irregularly in the thick part 14, and the trace does not remain. As a result, it is possible to prevent a void from being formed in the caulking fastening portion, causing a problem of insufficient strength, and a loss of aesthetic appearance.

溶融工程時間が経過した後、電圧の印加を停止すると共に、冷却エアーパイプ８のノズル部８ａから冷却用エアーを溶融面２の背面２ａに吹き付けることにより、溶着チップ１の溶融面２は冷却される。したがって、溶融面２と周側壁３により囲まれた空間２ｂ内に充満した溶融樹脂は固化し、きのこの傘の様な厚肉部１４（カシメ部）が形成される。
冷却工程時間が経過した後、冷却エアーの供給を停止し、溶着装置を上昇させると、図６（ｄ）の様に被固定物１２がカシメ留め２０された樹脂成形体を得ることができる。
また、冷却ピン１６の冷却効果により、溶融した樹脂が孔内にたれ落ちることがないため、厚肉部１４は変形することなく所望する外観形状のカシメ留め２０を形成することができる。
実施例２における、加熱時間、冷却時間、固定強度のデータを表２に記載する。 After the melting process time has elapsed, the application of voltage is stopped, and the air 2 for cooling is blown from the nozzle portion 8a of the cooling air pipe 8 to the back surface 2a of the melting surface 2, whereby the melting surface 2 of the welding tip 1 is cooled. The Therefore, the molten resin filled in the space 2b surrounded by the melting surface 2 and the peripheral side wall 3 is solidified to form a thick portion 14 (caulking portion) like a mushroom umbrella.
When the cooling air supply is stopped and the welding apparatus is raised after the cooling process time has elapsed, a resin molded body in which the fixed object 12 is caulked 20 as shown in FIG. 6D can be obtained.
Further, since the molten resin does not fall into the hole due to the cooling effect of the cooling pin 16, the thick-walled portion 14 can form the caulking stopper 20 having a desired external shape without being deformed.
Table 2 shows data of heating time, cooling time, and fixed strength in Example 2.

実施例３では、請求項２及び請求項４に記載した溶着チップ及びカシメ留め方法について説明する。
図８は本実施例３の溶着チップ１を示し、図８（ａ）は正面図、図８（ｂ）は図８（ａ）におけるＢ−Ｂ´線断面図、図９はカシメ留め工程の説明図である。
本実施例３は、図８に示す様に、実施例３の溶着チップ１は、溶着チップ１に形成された周側壁３の内周面３ａであって、奥側（溶融面２側）に絞り段部２１を形成したことを特徴とするものである。他の部分については、実施例１と同一である。 In Example 3, the welding tip and the caulking method described in claims 2 and 4 will be described.
FIG. 8 shows the welding tip 1 of the third embodiment, FIG. 8 (a) is a front view, FIG. 8 (b) is a sectional view taken along the line BB 'in FIG. 8 (a), and FIG. It is explanatory drawing.
In Example 3, as shown in FIG. 8, the welding tip 1 of Example 3 is the inner peripheral surface 3 a of the peripheral side wall 3 formed on the welding tip 1, and on the back side (melting surface 2 side). The diaphragm step portion 21 is formed. Other parts are the same as those in the first embodiment.

絞り段部２１は、溶融面２と周側壁３の内周面３ａとが交わる位置に形成されていて、幅１．７ｍｍ、高さが１．６ｍｍである。
この絞り段部２１を形成したことにより、厚肉部１４の固定面積を確保しつつ溶融面２の周囲であって、内周面と溶着ボス１１との距離が縮まり（図９参照）溶融面２の熱が溶着ボス１１へ伝わり易くなった。その結果、溶着ボス１１の溶融が充分に行なわれ、溶融時間の短縮に併せて、本実施例では実施例１に比べて約３０％の固定強度の向上を図ることができた。
また、冷却時には、冷却面積が増したことにより、冷却効率が向上して冷却時間を短縮することができた。本実施例では実施例１に比べて約１５％の時間短縮を図ることができた。
さらに、絞り段部２１を形成することにより、溶融面２周辺の強度が増し、応力が溶融面２に集中することがないため、繰り返し行われる溶着ボスへの押圧で溶融面２に変形が発生することがなく、よって、耐久性が向上した。
本実施例３における、加熱時間、冷却時間、固定強度のデータを表２に記載する。 The drawing step portion 21 is formed at a position where the melting surface 2 and the inner peripheral surface 3a of the peripheral side wall 3 intersect each other, and has a width of 1.7 mm and a height of 1.6 mm.
By forming the narrowing step portion 21, the distance between the inner peripheral surface and the welding boss 11 is reduced around the melting surface 2 while securing the fixed area of the thick portion 14 (see FIG. 9). The heat of 2 was easily transmitted to the welding boss 11. As a result, the welding boss 11 was sufficiently melted, and in accordance with the shortening of the melting time, in this example, it was possible to improve the fixing strength by about 30% compared to Example 1.
Further, at the time of cooling, the cooling area was increased, so that the cooling efficiency was improved and the cooling time could be shortened. In this example, the time was shortened by about 15% compared to Example 1.
Furthermore, since the strength of the periphery of the melting surface 2 is increased by forming the narrowed step portion 21 and the stress is not concentrated on the melting surface 2, the melting surface 2 is deformed by repeated pressing on the welding boss. Therefore, the durability was improved.
Table 2 shows data of heating time, cooling time, and fixed strength in Example 3.

［比較例１］
比較例として実施例１に紹介した溶着チップ１において、冷却ピン１６を備えていない従来の型の溶着チップ１を用いてカシメ留め作業を行なった。
その結果、図１１に示す様に、厚肉部１４内にボイド１５が発生し、固定強度は実施例１に比べて劣っていた。
比較例１における、加熱時間、冷却時間、固定強度のデータを表２に記載する。 [Comparative Example 1]
In the welding tip 1 introduced in Example 1 as a comparative example, a crimping operation was performed using a conventional type of welding tip 1 that does not include the cooling pin 16.
As a result, as shown in FIG. 11, voids 15 were generated in the thick portion 14 and the fixing strength was inferior to that of Example 1.
Table 2 shows data of heating time, cooling time, and fixed strength in Comparative Example 1.

［比較例２］
本比較例２は、溶融面の中心部に排気用の貫通孔を持たないピンを突出させた溶融チップを用いてカシメ留め作業を行った例である。その結果のデータを表２に記載する。

Figure 0004251504
※溶着ボス１１の形状
直径 ６ｍｍ 高さ １２ｍｍ
中空孔１１ａの径 ３．５ｍｍ 中空孔１１ａの深さ １２ｍｍ

図１０は、溶着チップ１の形状を拡大して示したもので、（ａ）は実施例１において説明した冷却凹部１７付の溶着チップの断面図、（ｂ）は実施例３において説明した絞り段部２１を形成した付溶着チップの断面図である。 [Comparative Example 2]
The comparative example 2 is an example in which the crimping operation is performed using a melting tip in which a pin not having an exhaust through hole is protruded at the center of the melting surface. The resulting data is listed in Table 2.
Figure 0004251504
 * Shape of welding boss 11 Diameter 6mm Height 12mm
Diameter of hollow hole 11a 3.5mm Depth of hollow hole 11a 12mm

FIG. 10 is an enlarged view of the shape of the welding tip 1, (a) is a cross-sectional view of the welding tip with the cooling recess 17 described in the first embodiment, and (b) is the aperture described in the third embodiment. It is sectional drawing of the welding tip in which the step part 21 was formed.

本発明に係る溶着チップを示すもので、（ａ）は側面図、（ｂ）は平面図、（ｃ）はＡ−Ａ´線断面図The welding tip which concerns on this invention is shown, (a) is a side view, (b) is a top view, (c) is AA 'line sectional drawing. 溶着チップを透視した斜視図Perspective view of the welding tip seen through 組み立て途中の溶着チップの斜視図Perspective view of welding tip during assembly 組み立てが完了した状態の溶着チップの斜視図A perspective view of the welding tip in a state where assembly is completed 組み立てが完了した状態の溶着チップの断面図Cross-sectional view of the welding tip when assembly is complete 溶着工程を示すもので、（ａ）は溶着開始直前の説明図、（ｂ）は溶融終了時の説明図、（ｃ）は冷却時の説明図、（ｄ）はカシメ留めを終了した状態の説明図The welding process is shown. (A) is an explanatory diagram immediately before the start of welding, (b) is an explanatory diagram at the end of melting, (c) is an explanatory diagram at the time of cooling, and (d) is a state where crimping is finished. Illustration 溶着ボスの中空孔内からガス体が流動して逃れている様態の説明図Explanatory drawing of a state in which a gas body flows away from the hollow hole of the welding boss 絞り段部付溶着チップ（実施例３）の説明図であって、（ａ）は側面図、（ｂ）はＢ−Ｂ´線断面図It is explanatory drawing of the welding tip (Example 3) with an aperture | diaphragm | squeeze part, Comprising: (a) is a side view, (b) is BB 'sectional drawing. 絞り段部付溶着チップにおける冷却ピンを介してガス体が流動している状態の説明図Explanatory drawing of the state in which the gas body is flowing through the cooling pin in the welding tip with a throttle step 冷却ピンと絞り段部付溶着チップを示すもので、（ａ）は冷却ピン及び冷却凹部付溶着チップの断面図、（ｂ）は絞り段部付溶着チップの断面図The cooling pin and the welding tip with the drawing step portion are shown. (A) is a sectional view of the welding tip with the cooling pin and the cooling concave portion, and (b) is a sectional view of the welding tip with the drawing step portion. 従来の溶着チップとカシメ留め方法の説明図であって、ａは側面図、ｂはＣ−Ｃ´線断面図It is explanatory drawing of the conventional welding tip and the crimping method, Comprising: a is a side view, b is CC 'line sectional drawing

符号の説明Explanation of symbols

１ 溶着チップ
２ 溶融面
３ 周側壁
８ エアーパイプ
１６ 冷却ピン
１７ 冷却凹部
２１ 絞り段部 DESCRIPTION OF SYMBOLS 1 Welding tip 2 Melting surface 3 Peripheral side wall 8 Air pipe 16 Cooling pin 17 Cooling recessed part 21 Drawing step

Claims (4)

樹脂基材に有底中空孔付の溶着ボスを突設し、この溶着ボスを被固定物側に形成した固定孔内に通して溶着ボスの先端を固定孔内から突出させ、この突出した溶着ボスの先端に周側壁で囲まれた溶融面を押し当てて溶着ボスの先端を溶融し、その後急冷することにより樹脂基材に被固定物をカシメ留めするための溶着チップにおいて、この溶着チップの溶融面の中心から下向きに、先端側に向かって細くなるようにテーパーをつけ、かつその先端が前記周側壁の下縁よりも突き出るようにして冷却ピンを突設すると共に、前記溶融面の背面の中心であって、前記冷却ピンが突出している部位に、前記冷却ピンの根元の部位に喰い込むように空冷凹部を形成したことを特徴とする樹脂製品のカシメ留め用溶着チップ。   A welding boss with a bottomed hollow hole is projected on the resin base material, and the tip of the welding boss protrudes from the fixing hole through the fixing boss formed on the fixed object side. In the welding tip for pressing the fusion surface surrounded by the peripheral wall to the tip of the boss to melt the tip of the welding boss and then rapidly cooling the object to be fixed to the resin base material, A taper is provided so as to taper downward from the center of the melting surface toward the tip side, and a cooling pin is provided so that the tip protrudes from the lower edge of the peripheral side wall, and the back surface of the melting surface. An air-cooling recess is formed at a portion of the cooling pin protruding from the center portion of the cooling pin so as to bite into a base portion of the cooling pin. 前記溶着チップの周側壁の内周面であって、溶融面に近い位置に、絞り段部を形成したことを特徴とする請求項１に記載の樹脂製品のカシメ留め用溶着チップ。   2. The welding tip for crimping a resin product according to claim 1, wherein a drawing step portion is formed at an inner peripheral surface of the peripheral side wall of the welding tip and close to the melting surface. ａ．樹脂基材に有底中空孔付の溶着ボスを突設し、この溶着ボスを被固定物側に形成した固定孔内に通して溶着ボスの先端を固定孔内から突出させ、この突出した溶着ボスの先端に周側壁で囲まれた溶融面を押し当てて溶着ボスの先端を溶融することにより、固定孔の直径より大きい厚肉部を形成し、その後急冷することにより樹脂基材に被固定物をカシメ留めする溶着方法において、
ｂ．前記溶着チップの溶融面の中心から下向きに先端側に向かって細くなるようにテーパーをつけ、かつその先端が前記周側壁の下縁よりも突き出るようにして冷却ピンを突設すると共に、前記溶融面の背面の中心であって、前記冷却ピンが突出している部位に、前記冷却ピンの根元の部位に喰い込むように空冷凹部を形成した構成の溶着チップに電圧を印加して前記溶融面を発熱させる、
ｃ．次に、前記溶着チップの冷却ピンを前記中空孔内に挿入しながら溶着チップの溶融面を溶着ボスの先端に押し当てて溶着ボスの溶融又は変形を開始することにより、溶融面と周側壁により囲まれた空間及び中空孔の上部と冷却ピンの根元側との間の隙間内に溶融した樹脂を充満させる、
ｄ．前記溶融した樹脂の充満時に、発熱温度が溶融面に比較して低い冷却ピンの作用により、この冷却ピンと接する溶融した樹脂面にいち早くスキン層を生成する、
ｅ．前記スキン層の生成が先行することにより、冷却ピンの周囲においてスキン層との間に微小な隙間を形成し、この隙間を経由して溶着ボスの中空孔内の底部空間に充満しているガス体を冷却ピンの先端の突き出しにより溶融樹脂に形成された孔から溶融面側に誘導してガス体が溶融した樹脂内に浸入するのを阻止する、
ｆ．次に、電圧の印加を止めて溶融面の裏側に冷却エアーを吹きつけて溶融面の冷却を行うと同時に、冷却凹部内に冷却エアーを吹きつけることにより、冷却ピンの根元部の冷却効果を高めて、溶融樹脂の厚肉部の冷却に併せて、冷却ピンの根元部における溶融樹脂の固化を促進させる、
ｇ．次に、冷却エアーを止めて溶着チップを引き離すことにより、被固定物の外にカシメ部を形成する、
ｈ．ことを特徴とする樹脂基材に被固定物をカシメ留めする方法。 a. A welding boss with a bottomed hollow hole is projected on the resin base material, and the tip of the welding boss protrudes from the fixing hole through the fixing boss formed on the fixed object side. The melted surface surrounded by the peripheral wall is pressed against the tip of the boss to melt the tip of the welded boss, thereby forming a thick part larger than the diameter of the fixing hole, and then fastened to the resin substrate by rapid cooling. In the welding method for caulking objects,
b. A taper is provided so as to taper downward from the center of the melting surface of the welding tip toward the tip side, and a cooling pin is provided so that the tip protrudes from the lower edge of the peripheral side wall. A voltage is applied to a welding tip having a configuration in which an air-cooled recess is formed in the center of the back surface of the surface, and the cooling pin protrudes into a base portion of the cooling pin, thereby applying the voltage to the melting surface. Fever,
c. Next, while the cooling pin of the welding tip is inserted into the hollow hole, the melting surface of the welding tip is pressed against the tip of the welding boss to start melting or deformation of the welding boss. Filling the melted resin in the space between the enclosed space and the top of the hollow hole and the root side of the cooling pin;
d. When the molten resin is filled, a skin layer is quickly generated on the molten resin surface in contact with the cooling pin by the action of the cooling pin whose exothermic temperature is lower than that of the molten surface.
e. Gas that fills the bottom space in the hollow hole of the welding boss through the gap by forming a minute gap with the skin layer around the cooling pin as a result of the formation of the skin layer preceding. Preventing the gas body from entering the molten resin by guiding the body from the hole formed in the molten resin to the molten surface side by protruding the tip of the cooling pin,
f. Next, the application of voltage is stopped and cooling air is blown to the back side of the melt surface to cool the melt surface, and at the same time, the cooling air is blown into the cooling recess, thereby improving the cooling effect of the base portion of the cooling pin. In combination with the cooling of the thick part of the molten resin, the solidification of the molten resin at the root part of the cooling pin is promoted.
g. Next, the crimping part is formed outside the fixed object by stopping the cooling air and pulling the welding tip apart.
h. A method for caulking an object to be fixed to a resin base material. 前記周側壁の内周面であって、溶融面側に近い位置に、絞り段部を形成した溶着チップを用いて行う請求項３に記載の樹脂基材に被固定物をカシメ留めする方法。   4. The method for caulking an object to be fixed to a resin base material according to claim 3, wherein a welding tip having a squeezing step is formed at an inner peripheral surface of the peripheral side wall and close to the melt surface side.
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