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JP6339395B2 - Welding method for resin molded products - Google Patents

Welding method for resin molded products Download PDF

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Publication number
JP6339395B2
JP6339395B2 JP2014065038A JP2014065038A JP6339395B2 JP 6339395 B2 JP6339395 B2 JP 6339395B2 JP 2014065038 A JP2014065038 A JP 2014065038A JP 2014065038 A JP2014065038 A JP 2014065038A JP 6339395 B2 JP6339395 B2 JP 6339395B2
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component
plane
welding
resin molded
molded product
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JP2015186872A5 (en
JP2015186872A (en
Inventor
浩和 浦野
浩和 浦野
寺田　浩
浩 寺田
潔 佐々木
潔 佐々木
川口　英靖
英靖 川口
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T.RAD CO., L T D.
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T.RAD CO., L T D.
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Priority to JP2014065038A priority Critical patent/JP6339395B2/en
Priority to PCT/JP2015/056573 priority patent/WO2015146530A1/en
Priority to CN201580016059.2A priority patent/CN106132667B/en
Priority to TW104109171A priority patent/TWI613062B/en
Publication of JP2015186872A publication Critical patent/JP2015186872A/en
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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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12449—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being asymmetric
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
    • B29C66/12469—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being asymmetric
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • 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
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/18—Heat-exchangers or parts thereof

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

Description

本発明は、樹脂製の第１部品と第２部品とを超音波溶着機によって接合する接合方法に関する。   The present invention relates to a joining method in which a first part made of resin and a second part are joined by an ultrasonic welding machine.

一例として、樹脂製ラジエータキャップは、弁本体とキャップ本体とを夫々樹脂成形品で形成し、両者を嵌着し、その接合部を超音波溶着により接合することができる。
第１部品と第２部品とが夫々複雑な形状をしている場合、各部品ごとに成形し、両部品を接合することにより、より複雑な部品を完成することができる。
図６〜図８は従来の樹脂成形品の溶着方法であり、図６はその第１部品１の平面図、図７は同縦断面図である。
上記のような環状の第１部品１を射出成形により形成するには、図７に示す如く、成形用金型の中心から溶融した樹脂７を内部に注入し、それを図６に示す如く、複数の架橋部８を介して半径方向外側に導くことになる。 As an example, the resin-made radiator cap can form a valve main body and a cap main body by a resin molded product, respectively, can fit both, and can join the junction part by ultrasonic welding.
When the first part and the second part have complicated shapes, a more complicated part can be completed by molding each part and joining both parts.
6 to 8 show a conventional method of welding a resin molded product. FIG. 6 is a plan view of the first component 1 and FIG. 7 is a longitudinal sectional view thereof.
In order to form the annular first component 1 as described above by injection molding, as shown in FIG. 7, molten resin 7 is injected into the inside from the center of the molding die, and as shown in FIG. It leads to the radial direction outer side via the some bridge | crosslinking part 8. FIG.

ところが、複数の架橋部８を介して溶融する樹脂７を環状部に供給するとき、その端面1aの表面に、僅かな凸部1bが形成されることがある。その凸部1bの高さは、一例として０．０２ｍｍ（図３参照）程度で極めて僅かである。
ところが、その第１部品１の端面1aに超音波溶接機のホーン４（またはコーンともいう）を当接し、超音波振動を与えると、僅かな凸部1bが平坦に押圧され、図８の如く、凸部1bの端部が端面1aの外周に溶融部５として付着する。そのため、第１部品１の外周が不体裁になると共に、その溶融部５が分離して部品の各部に付着するおそれがある。
上記のような成形品が弁ユニットを内部に有するラジエータキャップであった場合であり、分離した溶融部５が部品内部に浸入したときは、その分離した溶融部５の侵入によりキャップ内に設けられる弁ユニットが動作不良を起こし、ラジエータキャップのシール性を損なうおそれがある。
そこで、本発明はこのような凸部1bが端面1aの表面に形成されても、超音波振動の際にそれが外部に飛び出さないようにして、体裁が良く、且つ溶着不良が生じ難い成形品を提供することを課題とする。 However, when the molten resin 7 is supplied to the annular portion via the plurality of bridging portions 8, a slight convex portion 1b may be formed on the surface of the end surface 1a. As an example, the height of the convex portion 1b is about 0.02 mm (see FIG. 3) and is extremely small.
However, when the horn 4 (or cone) of the ultrasonic welder is brought into contact with the end surface 1a of the first component 1 and ultrasonic vibration is applied, the slight convex portion 1b is pressed flat, as shown in FIG. The end of the convex portion 1b adheres to the outer periphery of the end surface 1a as the melting portion 5. For this reason, the outer periphery of the first component 1 becomes unnatural, and the melted part 5 may be separated and adhere to each part of the part.
This is a case where the molded product as described above is a radiator cap having a valve unit therein, and when the separated melted part 5 enters the inside of the part, it is provided in the cap by the penetration of the separated melted part 5 The valve unit may malfunction and impair the sealing performance of the radiator cap.
Therefore, even if such a convex portion 1b is formed on the surface of the end surface 1a, the present invention prevents molding from protruding to the outside during ultrasonic vibration so that the appearance is good and poor welding hardly occurs. The issue is to provide goods.

請求項１に記載の本発明は、それぞれ樹脂成形品よりなる第１部品１と第２部品２とを超音波溶着機により、互いに接合する方法において、
第１部品１の軸線に直行する端面１ａが、略環状の平面に形成され、その平面に対して僅かに突出する凸部１ｂが前記軸線に対して放射状に互いに離間して、その平面上に複数存在するものであって、
前記端面１ａの外周縁又は内周縁の少なくとも一方に、前記平面に対して凹陥する環状の段部３を形成しておく工程と、
前記第１部品１と前記第２部品２とを接触させ、溶着機のホーン４を第１部品１の前記端面１ａに当接し、複数の各凸部１ｂを押圧しつつ、前記第１部品１および前記第２部品２間に超音波振動を与える溶着工程と、
を、具備し、
前記各凸部１ｂが超音波振動により平面に押込まれて平面に面一に形成され、各凸部１ｂの変形に伴い、前記各凸部１ｂの端部から生じる溶融樹脂を前記段部３内に留まるように溶着して、凸部１ｂの端部から生じる溶融樹脂が第１部品の端面の外周縁又は内周縁の少なくとも一方から、半径方向の外側又は内側の少なくとも一方に突出しないようにした樹脂成形品の溶着方法である。 The present invention according to claim 1 is a method of joining the first part 1 and the second part 2 each made of a resin molded product to each other by an ultrasonic welding machine.
An end face 1a perpendicular to the axis of the first component 1 is formed in a substantially annular plane, and convex portions 1b slightly projecting from the plane are radially separated from the axis, and are on the plane. There are several,
On at least the outer periphery or the inner periphery of the end face 1a, a step to be formed an annular stepped portion 3 of recessed relative to the plane,
Contacting the first component 1 and the second part 2, contact the horn 4 of the welding machine to the first said end face 1a of the component 1, while pressing a plurality of the convex portions 1b, the first component 1 and the welding step and the Ru applying ultrasonic vibrations between the second component 2,
Comprising
Each projection 1b is pushed into the plane by the ultrasonic vibration is formed flush in a plane, with the deformation of the projection 1b, the respective convex portions 1b molten resin in the stepped portion 3 resulting from the end of So that the molten resin generated from the end of the convex portion 1b does not protrude from at least one of the outer peripheral edge or inner peripheral edge of the end surface of the first component to at least one of the outer side or the inner side in the radial direction. This is a method of welding a resin molded product.

請求項２に記載の本発明は、請求項１に記載の樹脂成形品の溶着方法において、
前記第１部品（１）は、ラジエータキャップの弁本体であり、
前記第２部品（２）は、ラジエータキャップのキャップ本体であり、
前記段部（３）を、前記第１部品（１）である弁本体の端面（１ａ）の外周縁および内周縁に、予め環状に形成しておいたことを特徴とする樹脂成形品の溶着方法である。 According to a second aspect of the present invention, in the method for welding a resin molded product according to the first aspect,
The first part (1) is a valve body of a radiator cap;
The second part (2) is a cap body of a radiator cap,
The step (3) is formed in a ring shape in advance on the outer and inner peripheral edges of the end surface (1a) of the valve body which is the first component (1). Is the method.

本発明の樹脂成形品の溶着方法によれば、ホーン４が当接する第１部品の端面１ａの凸部１ｂが溶着されるとき、その端部から生じる溶融樹脂が段部３内に留まるように収納され、その凸部１ｂの端部から生じる溶融樹脂が部品の外周に押し出されることを防止し、体裁のよい樹脂成形品となる。即ち、溶着工程で、第１部品１の端面１ａの凸部１ｂが、端面１ａと面一に形成されたとき、その凸部１ｂの端部から生じる溶融樹脂が、周縁に設けた段部３に溶着され、それが外部に飛び出ることがない。また、このように凸部１ｂの端部から生じる溶融樹脂を段部３に溶着した場合、その凸部１ｂの端部から生じる溶融樹脂が分離して部品の内部に浸入することを防止することができるため、溶着不良が生じ難い樹脂成型品を提供できる。
一例として、ラジエータキャップの場合は、凸部１ｂの端部から生じうる溶融部５が内部に侵入することを防止できるため、そのシール性が損なわれることを効果的に防止しうる。 According to the welding method of the resin molded product of the present invention, when the convex portion 1b of the end surface 1a of the first part with which the horn 4 abuts is welded, the molten resin generated from the end portion remains in the step portion 3 . The molten resin generated from the end of the convex portion 1b is prevented from being pushed out to the outer periphery of the component, and the resin molded product has a good appearance. That is, in the welding step, when the convex portion 1b of the end surface 1a of the first component 1 is formed flush with the end surface 1a, the molten resin produced from the end portion of the convex portion 1b is provided on the peripheral portion. It will be welded to the outside and it will not jump out. Further, when the molten resin generated from the end portion of the convex portion 1b is welded to the step portion 3 in this way, the molten resin generated from the end portion of the convex portion 1b is prevented from separating and entering the inside of the component. Therefore, it is possible to provide a resin molded product that hardly causes poor welding.
As an example, in the case of a radiator cap, it is possible to prevent the melted portion 5 that can be generated from the end portion of the convex portion 1b from entering the inside, and thus it is possible to effectively prevent the sealing performance from being impaired.

請求項２に記載の樹脂成形品の溶着方法によれば、段部３を、前記第１部品１である弁本体の端面１ａの外周縁および内周縁に、予め環状に形成しておいたので、凸部１ｂの端部から生じる溶融樹脂を、周縁に設けた段部３に確実に溶着することができる。 According to the welding method of the resin molded article according to claim 2, the step portion 3, the outer peripheral edge and inner peripheral edge of the end face 1a of the first part 1 a is a valve body, so it had been formed in advance ring The molten resin generated from the end of the convex portion 1b can be reliably welded to the step portion 3 provided on the periphery.

本発明の樹脂成形品の溶着方法を示す説明図であって、その溶着前の要部縦断面図。It is explanatory drawing which shows the welding method of the resin molded product of this invention, Comprising: The principal part longitudinal cross-sectional view before the welding. 図１のII−II矢視断面図。II-II arrow sectional drawing of FIG. 図２のIII−III矢視断面拡大図。FIG. 同溶着方法の溶着時の要部縦断面拡大図。The principal part longitudinal cross-sectional enlarged view at the time of the welding of the welding method. 図４のＶ−ＶI矢視平面図（Ａ）、同（Ａ）のＢ−Ｂ矢視断面図。The V-VI arrow plan view of FIG. 4 (A), BB arrow sectional drawing of the same (A). 従来の第１部品１の端面１ａの平面図。The top view of the end surface 1a of the conventional 1st component 1. FIG. 同第１部品１の射出成形説明図。Explanatory drawing of injection molding of the said 1st component 1. FIG. 図７において、第１部品１とホーン４とを当接したとき、当接部にできる溶融部５の説明図。In FIG. 7, when the 1st component 1 and the horn 4 are contact | abutted, explanatory drawing of the fusion | melting part 5 which can be made into a contact part.

次に、図面に基づいて本発明の実施の形態につき説明する。
本実施例は、一例として、ラジエータ等のフィラーネック部に着脱自在に装着され、一対の分割体からなるラジエータキャップについて説明する。
図１は、第１部品１としてラジエータの弁本体と、第２部品２として同キャップ本体とを、図示しない超音波溶接機を介して接合する説明図である。
先ず、第１部品１と第２部品２とを嵌着する。それらの間には、予め、弁ユニットが介装されている。この弁ユニットは、図１の如く、負圧弁と正圧弁が環状の弁座を介して対向しており、それらの弁が負圧スプリングと正圧スプリングにより付勢されている。この時点では、第１部品１と第２部品２とは固定されていない。
その第１部品１の端面1aの表面には、凸部1bが放射方向に複数形成されている。この凸部1bは、図３に示す如く、その高さが一例として０．０２ｍｍ程度の極めて僅かなものである。 Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, as an example, a description will be given of a radiator cap that is detachably attached to a filler neck portion such as a radiator and includes a pair of divided bodies.
FIG. 1 is an explanatory view for joining a valve body of a radiator as a first part 1 and a cap body as a second part 2 via an ultrasonic welding machine (not shown).
First, the first component 1 and the second component 2 are fitted. A valve unit is interposed between them in advance. In this valve unit, as shown in FIG. 1, a negative pressure valve and a positive pressure valve are opposed to each other via an annular valve seat, and these valves are biased by a negative pressure spring and a positive pressure spring. At this time, the first component 1 and the second component 2 are not fixed.
On the surface of the end surface 1a of the first component 1, a plurality of convex portions 1b are formed in the radial direction. As shown in FIG. 3, the convex portion 1b has an extremely small height of about 0.02 mm as an example.

次に、この発明では、第１部品１の端面1aの外周及び内周には、僅かな段差である段部３が図１及び図２に示す如く形成されている。そして、図示しない超音波溶着機のホーン４を第１部品１の端面1aに当接し、第１部品１及び第２部品２間に超音波振動を与える。
前述の僅かな凸部1bはその振動によって、端面1aの平面内に押し込まれて平坦に形成される。それと共に、図４又は図５の如く、その凸部1bの両端部から生じうる溶融部５は段部３に溶着し、そこに溶融部５が保持される。そのため、超音波振動時に第１部品１の内周側及び外周側に流出した溶融部５は、そこから外部に飛び出ることがない。それにより、体裁の良い溶着が行われる。さらに、ラジエータキャップの内部に溶融部５が侵入することを防止することができるため、弁ユニットの動作に影響を及ぼすことがない。
このとき、図１において第１部品１の下端部は環状の凸部に形成され、第２部品２の上端部は環状の溝部に形成され、両者が同図の如く嵌着している。そして超音波振動によって、両者の嵌着部が溶着する。それにより、第１部品１と第２部品２とは一体化される。 Next, in the present invention, step portions 3 that are slight steps are formed on the outer periphery and inner periphery of the end surface 1a of the first component 1 as shown in FIGS. Then, the horn 4 of an ultrasonic welding machine (not shown) is brought into contact with the end face 1a of the first part 1 to apply ultrasonic vibration between the first part 1 and the second part 2.
The slight protrusion 1b described above is pushed into the plane of the end face 1a by the vibration and is formed flat. At the same time, as shown in FIG. 4 or FIG. 5, the melted portion 5 that can be generated from both ends of the convex portion 1b is welded to the step portion 3, and the melted portion 5 is held there. Therefore, the melted part 5 that has flowed out to the inner peripheral side and the outer peripheral side of the first component 1 during ultrasonic vibration does not jump out of the first part 1. As a result, good-quality welding is performed. Furthermore, since it can prevent that the fusion | melting part 5 penetrate | invades into the inside of a radiator cap, it does not affect the operation | movement of a valve unit.
At this time, in FIG. 1, the lower end portion of the first component 1 is formed in an annular convex portion, and the upper end portion of the second component 2 is formed in an annular groove portion, and both are fitted as shown in FIG. And the fitting part of both welds by ultrasonic vibration. Thereby, the 1st component 1 and the 2nd component 2 are integrated.

さらに、図１に記載の如く、第１部品１の端面1aの位置は、負スプリングが載置されるスプリング座の端面と架橋部８の端面の位置から高さをずらして設けられている（この図では、端面1aの位置がスプリング座の端面より上方に環状に突出している、これに対し、従来技術の図７では、端面1aとスプリング座と架橋部８が略面一に形成されている。）。このような構造とした場合、ホーン４の当接する面が端面1aのみとなるので、端面1aに段部３の加工を行えばよく、樹脂製ラジエータキャップの製造が容易となり、且つ、凸部1bの端部から生じうる溶融部５を確実に段部３に溶着することが可能となる。   Furthermore, as shown in FIG. 1, the position of the end surface 1a of the first component 1 is provided with a height shifted from the position of the end surface of the spring seat on which the negative spring is placed and the end surface of the bridging portion 8 ( In this figure, the position of the end face 1a protrudes in an annular shape above the end face of the spring seat. On the other hand, in FIG. 7 of the prior art, the end face 1a, the spring seat and the bridging portion 8 are formed substantially flush with each other. Yes.) In such a structure, the surface with which the horn 4 abuts is only the end surface 1a. Therefore, the stepped portion 3 can be processed on the end surface 1a, the resin radiator cap can be easily manufactured, and the convex portion 1b. It is possible to reliably weld the melted portion 5 that can be generated from the end portion to the stepped portion 3.

１ 第１部品
1a 端面
1b 凸部
２ 第２部品
３ 段部
４ ホーン
５ 溶融部
６ 樹脂流れ
７ 樹脂
８ 架橋部 1 First part
1a End face
1b Convex part 2 Second part 3 Step part 4 Horn 5 Melting part 6 Resin flow 7 Resin 8 Cross-linking part

Claims (2)

それぞれ樹脂成形品よりなる第１部品（１）と第２部品（２）とを超音波溶着機により、互いに接合する方法において、
第１部品（１）の軸線に直行する端面（１ａ）が、略環状の平面に形成され、その平面に対して僅かに突出する凸部（１ｂ）が前記軸線に対して放射状に互いに離間して、その平面上に複数存在するものであって、
前記端面（１ａ）の外周縁又は内周縁の少なくとも一方に、前記平面に対して凹陥する環状の段部（３）を形成しておく工程と、
前記第１部品（１）と前記第２部品（２）とを接触させ、溶着機のホーン（４）を第１部品（１）の前記端面（１ａ）に当接し、複数の各凸部（１ｂ）を押圧しつつ、前記第１部品（１）および前記第２部品（２）間に超音波振動を与える溶着工程と、
を、具備し、
前記各凸部（１ｂ）が超音波振動により平面に押込まれて平面に面一に形成され、各凸部（１ｂ）の変形に伴い、前記各凸部（１ｂ）の端部から生じる溶融樹脂を前記段部（３）内に留まるように溶着して、凸部（１ｂ）の端部から生じる溶融樹脂が第１部品の端面の外周縁又は内周縁の少なくとも一方から、半径方向の外側又は内側の少なくとも一方に突出しないようにした樹脂成形品の溶着方法。 In a method of joining the first part (1) and the second part (2) each made of a resin molded product to each other by an ultrasonic welding machine,
An end face (1a) perpendicular to the axis of the first component (1) is formed in a substantially annular plane, and convex portions (1b) slightly projecting from the plane are radially separated from the axis. And there are multiple on the plane,
At least one of the outer periphery or inner periphery of said end face (1a), a step to be formed a stepped portion of the annular shape recessed to (3) to the plane,
Wherein the first component (1) and the second part (2) and brought into contact with the end face (1a) in contact with a plurality of the convex portions of the horn (4) of the welding machine first component (1) ( while pressing the 1b), and the welding step of Ru applying ultrasonic vibrations while said first component (1) and the second part (2),
Comprising
Wherein each of the convex portions (1b) is formed flush to the plane to the plane pushed by the ultrasonic vibration, with the deformation of the convex portions (1b), the molten resin resulting from the end of each protrusion (1b) Is welded so as to remain in the step (3), and the molten resin generated from the end of the convex portion (1b) is radially outward from the outer periphery or the inner periphery of the end surface of the first part, A method of welding a resin molded product so as not to protrude to at least one of the inner sides. 請求項１に記載の樹脂成形品の溶着方法において、
前記第１部品（１）は、ラジエータキャップの弁本体であり、
前記第２部品（２）は、ラジエータキャップのキャップ本体であり、
前記段部（３）を、前記第１部品（１）である弁本体の端面（１ａ）の外周縁および内周縁に、予め環状に形成しておいたことを特徴とする樹脂成形品の溶着方法。 In the welding method of the resin molded product according to claim 1,
The first part (1) is a valve body of a radiator cap;
The second part (2) is a cap body of a radiator cap,
The step (3) is formed in a ring shape in advance on the outer and inner peripheral edges of the end surface (1a) of the valve body which is the first component (1). Method.
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