Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/80—General aspects of machine operations or constructions and parts thereof
  • B29C66/84—Specific machine types or machines suitable for specific applications
  • B29C66/861—Hand-held 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
• • 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
  • B29C65/7841—Holding or clamping means for handling purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
  • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
  • B29C66/114—Single butt joints
  • B29C66/1142—Single butt to butt joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—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
  • B29C66/52—Joining tubular articles, bars or profiled elements
  • B29C66/524—Joining profiled elements
  • B29C66/5241—Joining profiled elements for forming coaxial connections, i.e. the profiled elements to be joined forming a zero angle relative to each 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
  • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
  • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
  • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
  • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
• • 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
  • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
  • B29C66/824—Actuating mechanisms
  • B29C66/8242—Pneumatic or hydraulic drives
• • 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
  • 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
  • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
  • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both surfaces 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
  • 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
  • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
• • 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
  • B29L2031/001—Profiled members, e.g. beams, sections
  • B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts

Definitions

• the present invention relates to a method for the flashless welding of thermoplastic profiles. It also relates to a device for welding such profiles and to an endless profile welded by the method according to the invention.
• the "hot blade” method does not permit controlled, uniform heat ⁇ ing of the belt ends and therefore does not produce joints of uniform quality. It is thus one of the objects of the present invention to over ⁇ come the drawbacks and difficulties of the prior art methods and to provide a method that produces substantially flashless welded joints of high, uniform quality and precisely aligned profile ends.
• this is achieved by providing a method for producing a flashless, welded joint in a thermoplastic profile, comprising the steps of providing a piece of profile of predetermined length, with ends cut to have complementary surfaces, inserting the ends of said profile into an open mold, with the complementary surfaces of said ends facing one another at a distance, applying heat to said complementary surfaces, bringing said comple ⁇ mentary surfaces together in said open mold, closing said mold at least in the region of said brought-together complementary surfaces and applying pressure in said region in the plane of said surfaces, and allowing the thus-produced substantially flashless, welded joint to solidify under pressure.
• the invention further provides a device for producing a flashless, welded joint in a profile of predetermined length, with ends cut to have complementary surfaces, comprising two members, at least one of which has an at least partly open guide and molding groove adapted to snugly fit and accommodate said profile along at least some portions of at least one of the surfaces thereof, the other of said two members having at least one surface substantially aligned with at least one of the profile-fitting surfaces of said guide groove, at least one of said two members being movable in translation relative to the other member, means to immobilize one end portion of said profile relative to one of said two members, means to immobilize the other end portion of said profile relative to the other one of said two members, means to apply heat to said complementary surfaces, means to produce a translational movement of at least one of said members to bring together said two complementary surfaces after having been heated, and means to close at least a portion of said open guide and molding groove and to apply pressure in the region and the plane of said brought-together complementary surfaces.
• Fig. 1 is a schematic perspective view of the device according to the invention
• Fig. 2 illustrates the device in an initial stage of its use
• Fig. 3 is a partial view, in cross section along plane III—III in
• FIG. 2; Fig. 4 is a similar view, in cross section along plane IV—IV in
• Fig. 6 shows the device in the final stage of its use
• Fig. 9 is a partial view, in cross section along plane IX—IX in
• a stationary member 2 fixedly mounted on the base of the device (not shown).
• the stationary member has an open guide and molding groove 4 (see Fig. 3) of a cross-sectional shape configured to snugly fit the profile 6 to be spliced by welding.
• a V-belt profile 6 is shown accommodated in the groove 4.
• a second member 12 which is movable in translation, being guided by two guide rods 14 on which it is sliding- ly mounted. Movement of the member 12 is effected by a hydraulic or pneumatic cylinder 16 mounted on a bracket (not shown) fixedly attached to the above-mentioned base.
• the movable member 12 is preferably provided with a guide groove, 5, similar in size and shape, and in alignment with, the groove 4 of the stationary member 2.
• Each of the members 2, 12 is provided with a clamping means 18 and 20, respectively, shown in Fig. 1 in the open position.
• these clamping means When in the course of the welding operation these clamping means are brought down onto the profile end portions as located in their respective members, these ends are immobilized relative to these members.
• profile end A is immobilized with respect to the stationary member 2 by clamping means 18, and profile end B is immobilized with respect to the movable member 12 by clamping means 20.
• a and B completes the circumference of the profile partly formed by the molding groove 4. The purpose of this pad will be explained further below.
• a hot-air nozzle 24 Shown in Fig. 1 in its working position in which it blows hot air into the gap, it is used to soften the complementary surfaces 26, 28 of the ends A and B respectively, prior to the actual welding thereof. After the softening operation and prior to the below described welding stage, the nozzle 24 is withdrawn, to make way for the descending pad 22.
• the first step consists in preparing a piece of thermoplastic profile of the required length, having two end portions A and B, and two complementary surfaces 26,28 (Fig. 2).
• a butt surface perpendicular to the profile's center axis is produced.
• the end portion A is then inserted into the guide groove 4 of the stationary member 2 (Fig. 2) to a predetermined point advantageously indicated by a mark (not shown) and is then immobilized by clamping it down with the aid of the clamping means 18.
• the position of the belt inside the groove 4 with matching contours is clearly seen in Fig. 4, which also shows the clamping means 18 as clamped down.
• Fig. 5 The next step is illustrated in Fig. 5, showing the other end portion B inserted into the guide groove 5 and immobilized relative to the movable member 12 by clamping means 20.
• the complementary surfaces 26,28 now face one another at a short distance.
• the hot-air nozzle 24 is then swung into position above the gap 23, as shown in Figs. 6 and 7, and hot air is forced into the gap. - 1 -
• the movable member 12 is pneumatically pushed towards the stationary member 2, until the complementary surfaces 26,28 meet under controlled pressure and, having been thoroughly softened, fuse.
• the clamping means 18,20 and pressure pad 22 are opened and the now endless profile removed from the device, following which the cylinder 16 is activated to return the movable member 12 to its initial position.
• profile used to explain the device according to the invention was a V-belt profile
• other profiles can be welded using the device.
• Such profiles include round, rectangular, hollow, reinforced profiles, etc.
• the angle of cut of the ends A and B can be any pair of comple ⁇ mentary angles, allowing the continuity of the profiles.
• the members 2 and 12 are different for each profile, it is advantageous to design the members 2 and 12 as two-part blocks each, the upper part having the required groove and being exchangeable.
• the profile and size of the clamping means 18,20 and pressure pad 22, too, is determined by the profile.
• thermoplastic belt material While hot air has been found very suitable as heating medium for softening the thermoplastic belt material to the fusing point, other media are also possible, e.g., a flat electric heating element insertable into the gap 23 and producing radiant or contact heat or heat generated by electromagnetic fields.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=11061723

Family Applications (1)

Country Status (3)

Families Citing this family (7)

Family Cites Families (5)

• 1990
  • 1990-11-01 IL IL96207A patent/IL96207A0/xx unknown
• 1991
  • 1991-04-16 EP EP91908342A patent/EP0507891A1/de not_active Withdrawn
  • 1991-04-16 WO PCT/EP1991/000721 patent/WO1992007704A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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