US20060068161A1 - Structure of joining resin molded bodies - Google Patents

Structure of joining resin molded bodies Download PDF

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Publication number
US20060068161A1
US20060068161A1 US11/236,354 US23635405A US2006068161A1 US 20060068161 A1 US20060068161 A1 US 20060068161A1 US 23635405 A US23635405 A US 23635405A US 2006068161 A1 US2006068161 A1 US 2006068161A1
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United States
Prior art keywords
welding
joining
tilting
portions
vertical
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Abandoned
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US11/236,354
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English (en)
Inventor
Satoshi Enokida
Koichi Fujikawa
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DaikyoNishikawa Corp
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GP Daikyo Corp
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Publication date
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Assigned to G P DAIKYO CORPORATION reassignment G P DAIKYO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ENOKIDA, SATOSHI, FUJIKAWA, KOICHI
Publication of US20060068161A1 publication Critical patent/US20060068161A1/en
Assigned to DAIKYONISHIKAWA CORPORATION reassignment DAIKYONISHIKAWA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: G P DAIKYO CORPORATION
Priority to US12/075,539 priority Critical patent/US7799155B2/en
Abandoned legal-status Critical Current

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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
    • 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
    • B29C66/45—Joining of substantially the whole surface of the 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
    • 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
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin 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
    • B29C66/05—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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • 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
    • B29C66/545—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 one hollow-preform being placed inside the other
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar
    • Y10T428/195—Beveled, stepped, or skived in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet

Definitions

  • the present invention relates to a joining structure of resin molded bodies by means of a vibration welding method while applying a pressure to the pair of resin molded bodies in a state in which joining parts of the pair of resin molded bodies are butted into each other across a substantially entire area of the joining parts.
  • vibration welding method in which a vibration is applied to the resin molded bodies in a state in which joining parts of the pair of resin molded bodies are butted into each other and pressurized so that the pair of resin molded bodies are joined with each other.
  • Unexamined Japanese Patent Publication Nos. 2002-364469 and 2002-364471 disclose a method of welding a resin structure in which a sufficient increase of a joining strength of a tilting line section on a joining line is pursued in joining the resin molded bodies having a complicated shape.
  • the foregoing conventional technology proposed the following two methods; a method in which welding margins of the tilting portions in the pressurizing direction is set to be larger than any other welding margin in the same direction and the tilting portions are welded prior to any other part; and a method in which a pressurizing force is changed in a step of welding the tilting portions and in a step of welding the entire joining parts and the pressurizing force of the latter step is set to be larger than that of the former step.
  • a main object of the present invention is to provide a structure of joining resin molded bodies capable of realizing a reliable and superior joining strength across entire joining parts including tilting parts by devising a shape and a size of each protrusion for welding provided in the joining parts of the resin molded bodies.
  • a structure of joining resin molded bodies according to the present invention is a joining structure for joining a pair of resin molded bodies by means of a vibration welding method while applying a pressure to the pair of resin molded bodies in a state in which joining parts of the pair of resin molded bodies are butted into each other across a substantially entire area thereof, wherein the joining parts of the pair of resin molded bodies have vertical portions vertical to a direction in which the pressure is applied and tilting portions tilting relative to the pressurizing direction, the protrusions for welding are provided in at least the joining part of one of the pair of resin molded parts, and a butting area of the protrusions in the vertical portions is set to be narrower than a butting area thereof in the tilting portions in a state in which the protrusions are butted.
  • the forgoing constitution is preferably adapted to increase the butting area of the protrusions in the vertical portions toward a base of each protrusion.
  • the protrusions in the pressurizing direction more preferably have a substantially rectangular shape in section in the tilting portions, substantially a triangular shape in section in the vertical portions and substantially a trapezoidal shape in section between the vertical portions and the tilting portions.
  • the sectional area in the tilting portions is more preferably set to be equal to or more than sectional area in the vertical portions.
  • the butting area of the protrusions for welding in the tilting portions in the state in which the protrusions are butted is set to be larger than the butting area thereof in the vertical portions in the same state. Therefore, when the vibration welding is carried out while the pressure is applied to the resin molded bodies in the butted state, a welding area in the tilting portions is larger than a welding area in the vertical portions at least in an initial stage of the welding. As a result, the joining strength in the tilting portion, in which it is generally difficult to obtain a reliable and superior joining strength in comparison to the vertical portion, can be enhanced, and the reliable and superior joining strength can be thereby realized across the entire joining parts.
  • the butting area of the protrusions in the vertical portions is preferably set to be larger toward the base of each protrusion.
  • the welding area in the vertical portions can be increased as the welding advances without necessarily changing the pressurizing force applied to the resin molded bodies though the welding area is relatively small in the initial stage of the welding. Thereby, a required joining strength in the vertical portions can be assured.
  • the protrusions in the pressurizing direction more preferably have the substantially rectangular shape in section in the tilting portions so that the welding area is substantially constant regardless of the advancement of the welding.
  • the reliable joining strength can be obtained.
  • the protrusions in the pressurizing direction preferably have the substantially triangular shape in section in the vertical directions so that the welding area can be increased as the welding advances. Therefore, the welding area in the vertical portions can be increased as the welding advances without necessarily changing the pressurizing force though the welding area in the initial stage of the welding is relatively small. As a result, the required joining strength in the vertical portions can be assured.
  • the protrusions in the pressurizing direction preferably have the substantially trapezoidal shape in section between the vertical portions and the tilting portions so that a drastic change of the welding area in the joining region from the tilting portions through the vertical portions can be alleviated. As a result, the reliable and superior joining strength can be realized in the entire joining parts.
  • the sectional area of the welding margins of the protrusions in the direction orthogonal to the butting surface in the tilting portions is more preferably set to be equal to or more than the sectional area thereof in the same direction in the vertical portions so that a welding amount in the tilting portions can be equal to or more than a welding amount in the vertical portions in the direction orthogonal to the butting surface.
  • the joining strength in the tilting portions in which it is generally difficult to obtain the reliable and superior joining strength in comparison to the vertical portion, can be enhanced.
  • the reliable joining strength can be obtained across the entire joining parts in the direction orthogonal to the butting surface.
  • FIG. 1 is a front view of upper and lower half bodies according to an embodiment of the present invention.
  • FIG. 2 is a plan view of the lower half body.
  • FIG. 3 is a sectional view of a protrusion for welding in the upper half body in a pressurizing direction.
  • FIG. 4 is a sectional view of a protrusion for welding in a tilting portion of the upper half body in the pressurizing direction.
  • FIG. 5 is a sectional view of a protrusion for welding in a vertical portion of the upper half body in the pressurizing direction.
  • FIG. 6 is a sectional view of a protrusion for welding between the tilting portion and the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 7 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 8 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 9 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 10 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 11 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 12 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 13 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 14 is a sectional view of a modification example of the protrusion for welding in the vertical portion of the upper half body in the pressurizing direction.
  • FIG. 15 is an illustration of an example of a welding margin of the protrusion for welding in the vertical portion.
  • FIG. 16 is a graph showing a variation of a welding area in a direction in parallel with a butting surface in a triangular-shape welding margin in accordance with an advancement of the welding.
  • FIG. 17 is a graph showing a variation of a contact pressure and a variation of a welding sectional area in a direction orthogonal to the butting surface in accordance with the advancement of the welding in the case of the triangular-shape welding margin.
  • FIG. 18 is a graph showing a variation of a welding area in the direction parallel with the butting surface in accordance with the advancement of the welding in the case of a bell-shape welding margin.
  • FIG. 19 is a graph showing a variation of a contact pressure and a variation of a welding sectional area in the direction orthogonal to the butting surface in accordance with the advancement of the welding in the case of the bell-shape welding margin.
  • FIG. 1 is a front view of an upper half body and a lower half body constituting a pair of resin molded bodies according to the present embodiment.
  • FIG. 2 is a plan view of the lower half body.
  • an upper half body 10 and a lower half body 20 are respectively formed into a saddle shape in front view by left and right lower sides 11 and 21 , upper sides 13 and 23 substantially in parallel with the lower sides 11 and 21 , and slant sides 12 and 22 connecting the upper sides 13 and 23 and the lower sides 11 and 21 .
  • an integrated resin product comprising a hollow part is formed.
  • a lower edge of the upper half body 10 and an upper edge of the lower half body 20 respectively constitute joining parts thereof.
  • the upper half body 10 and the lower half body 20 are respectively formed from, for example, polyamide resin in which glass reinforced fibers are combined.
  • the bodies 10 and 20 are combined with each other in the vertical direction shown in FIG. 1 so that the substantially entire joining parts thereof are butted into each other. Then, in the state in which they are butted into each other, a pressure is applied to both of the half bodies 10 and 20 in a direction indicated by an arrow F shown in FIG. 1 , while a vibration of a predetermined vibration number and amplitude is applied thereto at the same time in a direction indicated by a reciprocating arrow K shown in FIG. 2 . As a result, the half bodies 10 and 20 are joined with each other by means of the vibration welding method.
  • the lower sides 11 and 21 and the upper sides 13 and 23 of the respective half bodies 10 and 20 are substantially vertical to the pressurizing direction (see arrow F direction), while the slant sides 12 and 22 are tilted relative to the pressurizing direction.
  • Joining parts 11 s and 21 s in the lower sides 11 and 21 and joining parts 13 s and 23 s in the upper sides 13 and 23 of the respective half bodies 10 and 20 correspond to the “vertical portions” recited in the claims of the present invention, while joining parts 12 s and 22 s in the slant sides 12 and 22 thereof correspond to the “tilting portions” recited therein.
  • protrusions for welding 11 E, 12 E, 13 E, 21 E, 22 E and 23 E are provided in response to the lower sides 11 and 21 , the slant sides 12 and 22 and the upper sides 13 and 23 .
  • the protrusions for welding 11 E, 12 E and 13 E of the upper half body 10 and the protrusions for welding 21 E, 22 E and 23 E of the lower half body 20 are respectively butted into each other.
  • the protrusions for welding as described above are not necessarily provided in both of the upper and lower half bodies 10 and 20 , but may be provided in one of them.
  • the butting area in the vertical portions vertical to the pressurizing direction (the joining parts 11 s and 21 s of the lower sides 11 and 21 and the joining parts 13 s and 23 s of the upper sides 13 and 23 ) is set to be narrower than the butting area in the tilting portions tilted relative to the pressurizing direction (the joining parts 12 s and 22 s of the slant sides 12 and 22 ).
  • the protrusions for welding 1 E, 12 E and 13 E in the vertical portions 11 s and 13 s and the tilting portion 12 s of the upper half body 10 have a same shape in section in the pressurizing direction.
  • the protrusion for welding 13 E in the joining part 13 s of the upper side 13 for example, the protrusion 13 E including a welding margin 13 w has a substantially rectangular shape in section as shown in FIG. 3 .
  • the protrusions for welding 21 E and 23 E in the vertical portions 21 s and 23 s and the protrusion for welding 22 E and the tilting portion 22 s are arranged to have different sectional shapes in the pressurizing direction.
  • the protrusion for welding 22 E in the tilting portion 22 s including a welding margin 22 w has the substantially rectangular shape in section in the pressurizing direction as shown in FIG. 4 .
  • the protrusion for welding 23 E in the joining part 23 s of the upper side 23 for example, has the substantially rectangular shape from a base through an intermediate position thereof and a substantially triangular shape in section at an edge side thereof (that is, a welding margin 23 w ) as shown in FIG. 5 .
  • the protrusion for welding 24 E between the vertical portions 21 s and 23 s and the tilting portion 22 s has the substantially rectangular shape in section in the pressurizing direction from a base through an intermediate position thereof and a substantially trapezoidal shape at an edge side thereof (that is, a welding margin 24 w ) as shown in FIG. 6 .
  • the protrusions for welding 11 E, 12 E and 13 E of the upper half body 10 and the protrusions for welding 21 E, 22 E and 23 E of the lower half body 20 are arranged to have the foregoing shapes in section in the pressurizing direction, the butting area in the tilting portions 12 s and 22 s is larger than the butting area in the vertical portions 11 s and 21 s and in the vertical portions 13 s and 23 s in the state in which the protrusions for welding are butted.
  • a welding area of the tilting portions 12 s and 22 s is larger than welding area of the vertical portions 11 s and 21 s and the vertical portions 13 s and 23 s at least in an initial stage of the welding (in the present embodiment, until the welding in the entire welding margins is completed).
  • a joining strength can be enhanced in the tilting portions 12 s and 22 s , in which it is generally difficult to obtain a reliable and superior joining strength in comparison to the vertical portions 11 s and 21 s , and the vertical portions 13 s and 23 s , and a reliable and superior joining strength can be realized across the entire joining parts.
  • the protrusions for welding 21 E and 23 E of the vertical portions 21 s and 23 s have the substantially rectangular shape in section the pressurizing direction from the base through the intermediate position thereof and the substantially triangular shape in section at the edge side thereof (that is, the welding margins 21 w and 23 w ), the butting area of the protrusions for welding 21 E and 23 E in the vertical portions 21 s and 23 s is increased toward the bases of the protrusions 21 E and 23 E until the welding in the welding margins 21 w and 23 w is completed.
  • the welding area in the vertical portions 21 s and 23 s can be increased as the welding advances without necessarily changing the pressurizing force with respect to the half bodies 10 and 20 though the welding area is relatively small in the initial stage of the welding. As a result, a required joining strength in the vertical portions 11 s and 21 s and the vertical portions 13 s and 23 s can be assured.
  • the protrusions for welding 21 E, 22 E and 23 E of the lower half body 20 are arranged to have the substantially rectangular shape in section the pressurizing direction in the tilting portion 22 s , the welding area can be substantially constant regardless of the advancement of the welding, which realizes the reliable joining strength.
  • the welding margins in the vertical portions 21 s and 23 s have the substantially triangular shape so that the welding area can be increased as the welding advances.
  • the welding area can be increased as the welding advances without necessarily changing the pressurizing force though the welding area is relatively small in the initial stage of the welding, which leads to the assurance of the required joining strength.
  • the substantially trapezoidal shape is arranged between the vertical portions 21 s and 23 s and the tilting portion 22 s so that a drastic change of the welding area can be alleviated in the joining region from the tilting portion 22 s through the vertical portions 21 s and 23 s .
  • the reliable and superior joining strength across the entire joining parts can be realized.
  • FIGS. 7 through 14 respectively show various examples of modifications of the sectional shape of the protrusion for welding in the pressurizing direction provided in the lower half body 20 .
  • protrusions for welding E 7 and E 18 shown in FIGS. 7 and 8 the rectangular shape and the triangular shape are combined.
  • the protrusions for welding E 9 and E 10 shown in FIGS. 9 and 10 is a modification in which a curved line is applied to the triangular shape.
  • a protrusion for welding E 11 shown in FIG. 11 has a bell shape, and a protrusion for welding E 12 shown in FIG. 12 is a modification of the bell-shaped E 11 .
  • the protrusions for welding E 13 and E 14 shown in FIGS. 13 and 14 is a modification in which a recessed portion is provided in a central part in section.
  • the sectional area in the tilting portion 22 s is set to be equal to or more than the sectional area in the vertical portions 21 s and 23 s.
  • a welding amount in the tilting portion 22 s can be equal to or more than a welding amount in the vertical portions 21 s and 23 s in the direction orthogonal to the butting surface so that the joining strength in the tilting portions 21 s and 23 s , in which it is generally difficult to obtain the reliable and superior joining strength in comparison to the vertical portion 22 s , can be enhanced.
  • the reliable and superior joining strength can be attained in the entire joining parts in a direction orthogonal to a butting surface.
  • the sectional area in the tilting portion 22 s is arranged to be substantially equal to the sectional area in the vertical portions 21 s and 23 s so as to minimize a difference between the respective welding amounts in the tilting portion 22 s and the vertical portions 21 s and 23 s .
  • the joining strength can be more reliable in the entire joining parts.
  • a simulation for the structure of joining the resin molded bodies constituted as described was carried out, which examined a variation of the welding areas in the vertical portions and the tilting portions and a variation of the pressurizing force (so-called contact pressure) in the direction orthogonal to the butting surface in accordance with the advancement of the welding.
  • the simulation was carried out regarding a case in which the welding margin of the protrusion for welding in the tilting portion has the rectangular shape in section in the pressurizing direction (see FIG. 4 ) as in the conventional case, and the welding margin of the protrusion for welding in the vertical portion has the triangular shape in section in the pressurizing direction (see FIG. 5 ) and the bell shape (see FIG. 11 ), and the conventional joining structure in which the welding margins of the protrusions for welding in the vertical and tilting portions both have the rectangular shape in section in the pressurizing direction was used for comparison.
  • FIG. 15 shows sectional shapes and dimensions in the pressurizing direction in the examples of the welding margin of the protrusion for welding in the vertical portion, which were used in the present simulation.
  • a width of the welding margin is 4.0 mm and a height thereof is 2 mm at maximum in the both examples.
  • An entire sectional area thereof is 4 mm 2 in the case of the triangular shape and 4.28 mm 2 in the case of the bell shape.
  • a tilting angle of the tilting portion relative to the pressurizing direction is 45 degrees.
  • a width of the welding margin in the example of the welding margin of the protrusion for welding in the tilting portion is constantly 4.0 mm, and the same values are employed in the vertical and tilting portions in the conventional structure for comparison.
  • All of the sectional shapes in the pressurizing direction in an opposite welding margin of the joining parts to be butted into the aforementioned welding margin are rectangular.
  • the welding areas in the vertical portion and the tilting portion and the pressurizing force (so-called contact pressure) in the direction orthogonal to the butting surface in accordance with the advancement of the welding were examined in the case of vibration-weld the welding margins in the foregoing examples by applying a pressure thereto by means of a hydraulic or pneumatic pressurizing device and applying a predetermined vibration in the state in which the welding margins were butted into each other.
  • a predetermined pressurizing force of the pressurizing device was set to, for example, 2 MPa, and the welding area and the contact pressure were calculated in each advancement of the welding (sinking) per 0.25 mm. Further, the sectional area of the welding part in the direction orthogonal to the butting surface (that is, welding sectional area) in the respective examples of the welding margin was also calculated.
  • Tables 1 and 2 show a calculation result of the example in which the welding margin in the vertical portion has the triangular shape in section in the pressurizing direction (see FIG. 5 ).
  • FIGS. 16 and 17 show graphs respectively corresponding to the Tables 1 and 2.
  • the Table 1 and FIG. 16 show a variation of the welding area in a direction in parallel with the butting surface in the case of the triangular shape (so-called plane parallel direction) in accordance with the advancement of the welding.
  • TABLE 1 Welding area in plane parallel direction (mm 2 ) Tilting portion Vertical portion Sinking amount Welding length (mm) 400 Welding length (mm) 400 (mm) Welding width (mm) Welding area Welding width (mm) Welding area Total welding area 0.00 4 1600 0.00 0.0 1600.0 0.25 4 1600 0.50 200.0 1800.0 0.50 4 1600 1.00 400.0 2000.0 0.75 4 1600 1.50 600.0 2200.0 1.00 4 1600 2.00 800.0 2400.0 1.25 4 1600 2.50 1000.0 2600.0 1.50 4 1600 3.00 1200.0 2800.0 1.75 4 1600 3.50 1400.0 3000.0 2.00 4 1600 4.00 1600.0 3200.0
  • the Table 2 and FIG. 17 show a variation of the contact pressure and a variation of the welding area in the direction orthogonal to the butting surface (so-called plane vertical direction) in accordance with the advancement of the welding in the case of the triangular shape.
  • welding Present embodiment sectional area in plane vertical Comparative example: contact contact pressure (Mpa) direction (mm 2 ) pressure (Mpa) Sinking amount Tilting Vertical Tilting Vertical Tilting Vertical (mm) portion portion portion portion portion portion portion 0.00 2.83 4.00 0 0.00 1.41 2.00 0.25 2.51 3.56 1 0.06 1.41 2.00 0.50 2.26 3.20 2 0.25 1.41 2.00 0.75 2.06 2.91 3 0.56 1.41 2.00 1.00 1.89 2.67 4 1.00 1.41 2.00 1.25 1.74 2.46 5 1.56 1.41 2.00 1.50 1.62 2.29 6 2.25 1.41 2.00 1.75 1.51 2.13 7 3.06 1.41 2.00 2.00 1.41 2.00 8 4.00 1.41 2.00
  • a straight line L 1 k denotes the welding area in the tilting portion in the plane parallel direction
  • L 1 s denotes the welding area in the vertical portion in the plane parallel direction.
  • a straight line L 2 k and a curved line L 2 s respectively denote the welding sectional areas in the tilting and vertical portions in the plane vertical direction
  • a curved line L 3 k an a curved line L 3 s respectively denote the contact pressures in the tilting and vertical portions
  • a straight line L 4 k and a straight line L 4 s respectively show the contact pressures in the tilting and vertical portions in the comparative example.
  • the protrusion has the rectangular shape in section in the pressurizing direction in both of the tilting and vertical portions, which is a general joining structure in the conventional technology.
  • the contact pressures in the tilting and vertical portions is higher than in the case of the comparative example until the welding in the entire height of the welding margin is completed. Further, in the present embodiment, the welding sectional area in the tilting portion in the plane vertical direction (see the straight line L 2 k ) is larger than the welding sectional area in the vertical portion in the plane vertical direction (see the curved line L 2 s ).
  • Tables 3 and 4 show a calculation result of the example in which the welding margin in the vertical portion has the bell shape in section in the pressurizing direction (see FIG. 11 ).
  • FIGS. 18 and 19 show graphs respectively corresponding to the Tables 3 and 4.
  • the Table 3 and FIG. 18 shows the variation of the welding area in the direction in parallel with the butting surface (plane parallel direction) in the case of the bell shape in accordance with an advancement of the welding.
  • TABLE 3 Welding area in plane parallel direction (mm 2 ) Tilting portion Vertical portion Sinking amount Welding length (mm) 400 Welding length (mm) 400 (mm) Welding width (mm) Welding area Welding width (mm) Welding area Total welding area 0.00 4 1600 0.00 0.0 1600.0 0.25 4 1600 0.15 60.0 1660.0 0.50 4 1600 0.35 140.0 1740.0 0.75 4 1600 0.80 320.0 1920.0 1.00 4 1600 2.00 800.0 2400.0 1.25 4 1600 3.20 1280.0 2880.0 1.50 4 1600 4.00 1600.0 3200.0 1.75 4 1600 4.00 1600.0 3200.0 2.00 4 1600 4.00 1600.0 3200.0 3200.0
  • the Table 4 and FIG. 19 show a variation of the contact pressure and a variation of the welding area in the direction orthogonal to the butting surface in the case of the bell shape (plane vertical direction) in accordance with an advancement of the welding.
  • welding Present embodiment sectional area in plane vertical Comparative example: contact contact pressure (Mpa) direction (mm 2 ) pressure (Mpa) Sinking amount Tilting Vertical Tilting Vertical Tilting Vertical (mm) portion portion portion portion portion portion portion portion 0.00 2.83 4.00 0 0.00 1.41 2.00 0.25 2.73 3.86 1 0.02 1.41 2.00 0.50 2.60 3.68 2 0.04 1.41 2.00 0.75 2.36 3.33 3 0.18 1.41 2.00 1.00 1.89 2.67 4 0.59 1.41 2.00 1.25 1.57 2.22 5 1.34 1.41 2.00 1.50 1.41 2.00 6 2.28 1.41 2.00 1.75 1.41 2.00 7 3.28 1.41 2.00 2.00 1.41 2.00 8 4.28 1.41 2.00
  • a straight line L 5 k denotes the welding area in the tilting portion in the plane parallel direction
  • L 5 s denotes the welding area in the vertical portion in the plane parallel direction.
  • the welding are in the direction in parallel with the butting surface (plane parallel direction) is constant in the tilting portion.
  • the welding area in the vertical direction increases along a certain curved line in response to the advancement of the welding (that is, the increase of the sinking amount) and is consequently equal to the welding area in the tilting portion when the sinking amount reaches 1.5 mm.
  • a straight line L 6 k and a curved line L 6 s respectively denote the welding areas in the tilting portion and the vertical portion in the plane vertical direction
  • a curved line L 7 k and a curved line L 7 s respectively denote the contact pressures in the tilting portion and the vertical portion
  • a straight line L 8 k and a straight line L 8 s respectively denote the contact pressures in the tilting and vertical portions in the comparative example.
  • the comparative example is a general joining structure similar to the conventional joining structure shown in FIG. 17 .
  • the contact pressure in the vertical portion is higher than the contact pressure in the comparative example until the welding in the entire height of the welding margin is completed, and the contact pressure in the tilting portion is larger than the contact pressure in the comparative example until the sinking amount reaches 1.5 mm and is thereafter equal to the contact pressure in the comparative example.
  • the welding sectional area in the tilting portion in the plane vertical direction is larger than the welding sectional area in the vertical portion in the plane vertical direction (see the curved line L 6 s ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US11/236,354 2004-09-28 2005-09-27 Structure of joining resin molded bodies Abandoned US20060068161A1 (en)

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JP2019084795A (ja) * 2017-11-09 2019-06-06 株式会社Ｓｕｂａｒｕ 連結構造
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DE102005046137A1 (de) 2006-04-06
US20080156412A1 (en) 2008-07-03
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JP4256320B2 (ja) 2009-04-22
US7799155B2 (en) 2010-09-21

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