JP2010099960A - Heat welding device of resin molding component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit a blow molded component from deviating by jouncing of a clamp member on welding and secure welding strength with an injection molded component. <P>SOLUTION: A heat welding device of resin molding components, which welds both intended joints 14, 24 by mutually pushing them after melting the intended joints 14, 24 of the blow molded component (a ventilation pipe 10) and the injection molded component (a resonator 20) by heating with a hot plate 30, includes: respective clamp members 40, 50 capable of separately gripping the blow molded component and the injection molded component; a drive mechanism 60 which is capable of moving the clamp member 50 of injection molded component toward the clamp member 40 of blow molded component and pushing the intended joints 14, 24 of both molded components together; and a stopper 70 which is arranged at the opposite side to the clamp member 50 of injection molded component receiving the clamp member 40 of blow molded component and bearing a pressing force when the intended joint of injection molded component is pressed to the intended joint of blow molded component. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat welding apparatus for a resin molded product for heating and welding a ventilation pipe (blow molded product) and a resonator (injection molded product) of an intake / exhaust system in a vehicle engine, for example.

  As a structure for joining a ventilation pipe and a resonator of a vehicle, a technique as disclosed in Patent Document 1 is known. And as a means to join two molded products, such as a blow molded product and an injection molded product, it may be welded by a hot plate welding method or the like. As a procedure for welding, after heating and melting the joining part of both molded products, both molding parts are pressed and the joining scheduled part is abutted and welded. In the hot plate welding method, a hot plate heated to a melting temperature or higher is interposed between the planned joining locations, and the planned joining locations are heated by contact or non-contact.

Items that guarantee the welding quality in the welding method include airtightness and welding strength. Since airtightness can be confirmed by submergence inspection or inspection by a leak tester, there is no problem even if the inspection target is a normal product such as a delivered product. On the other hand, since the welding strength is confirmed by an inspection by a destructive test such as a pressure test or a tensile test, it cannot be used for a normal product.
Therefore, as an alternative means for inspecting the welding strength, the distance between the two molded products that have been welded is measured, and the pressing amount of both molded products is controlled so that this distance becomes a specified value. Specifically, the injection-molded product is moved toward the blow-molded product, the stroke of the drive mechanism that can press the planned joint position of both molded products is regulated, and the distance between the two molded products is kept within the specified value. To manage.
Japanese Utility Model Publication No. 7-20329

  Of the two molded products, the blow-molded product having a hollow shape may be deformed due to the pressure applied from the injection molded product at the time of welding. In order to avoid this, it is necessary to hold the blow molded product with a clamp member. However, the blow-molded product is a uniform long product, and a clamp fulcrum is set at a position away from the grip portion of the clamp member in the longitudinal direction of the blow-molded product in order to avoid interference with the hot plate. As a result, the backlash of the clamp member is increased, the blow molded product escapes due to the pressure applied from the injection molded product, and the welding strength may not be ensured.

  The present invention is intended to solve such problems, and its purpose is to prevent the blow-molded product from escaping due to rattling of the clamp member during welding, and to secure the welding strength with the injection-molded product. .

The present invention is for achieving the above object, and is configured as follows.
1st invention is the heat welding apparatus of the resin molded product which heats and melt | dissolves the joining planned location of a blow molded product and an injection molded product with a hot plate, and then presses both the planned joining locations together and welds them. Each of the clamp members capable of individually gripping the blow molded product and the injection molded product, and the clamp member of the injection molded product are moved toward the clamp member of the blow molded product, and the joint planned location of both molded products is The drive mechanism that can be pressed and the clamp member of the blow molded product are arranged on the opposite side of the clamp member of the injection molded product, and the injection molded product is scheduled to be joined at the planned location of the blow molded product. And a stopper for receiving the applied pressure when pressed.

  In this configuration, the blow molded product escapes due to the backlash of the clamp member by receiving the pressure applied from the side of the injection molded product on the blow molded product which is uniformly long and has a large backlash of the clamp member. It is possible to prevent welding and to secure the welding strength at the locations where the mutual bonding is planned.

  According to a second aspect, in the first aspect, the clamp member of the blow molded product is supported by a stay extending along the longitudinal direction of the blow molded product, and a clamp fulcrum is set at the base end portion of the stay. The stopper includes an upper clamp and a lower clamp supported on the table of the equipment, and the stopper includes a contact member fixed to the upper clamp and a receiving member fixed to the table and receiving the contact member.

  Thus, of the clamp member of the blow molded product, only the upper clamp that is supported by the stay and whose clamp fulcrum is separated from the gripping part is received by the stopper, and the blow molded product escapes due to the applied pressure from the injection molded product side. Can be effectively prevented.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a three-dimensional blow-molded product (venting pipe 10) and an injection-molded product (resonator 20). The ventilation pipe 10 which is a blow molded product constitutes a part of the intake and exhaust pipe of a vehicle engine, and the resonator 20 which is an injection molded product is a silencer for absorbing abnormal noise transmitted through the gas in the intake and exhaust pipe. It is. Therefore, it is necessary to couple the ventilation pipe 10 and the resonator 20 in a state where the insides thereof are in communication with each other. For this reason, the ventilation pipe 10 and the resonator 20 have communication ports 12 and 22 that communicate with the interior thereof, and the peripheral portions of the individual communication ports 12 and 22 are the planned joining locations 14 and 24 by thermal welding.
Note that a resonator 28 that has already been joined by thermal welding is located on the opposite side of the planned joining location 14 in the ventilation pipe 10.

As shown in FIG. 2 and FIG. 3, when joining planned joint portions 14, 24 of the vent pipe 10 and the resonator 20 by thermal welding, the vent pipe 10 and the resonator 20 are held by the individual clamp members 40, 50. . These clamp members 40 and 50 are disposed on the table T of the facility, and position the ventilation pipe 10 and the resonator 20 in a state where the respective planned joining portions 14 and 24 face each other.
The clamp member 40 that holds the ventilation pipe 10 includes an upper clamp 42 and a lower clamp 44 that hold the outer peripheral surface of the ventilation pipe 10 in a manner that sandwiches it from above and below. The upper clamp 42 has a structure in which a tip end of a stay 42a extending along the longitudinal direction of the ventilation pipe 10 is connected to a column 42b standing on the table T by a support shaft 42c (FIG. 3).

The reason for using the long stay 42a for the upper clamp 42 in this way is to prevent the connecting portion between the stay 42a and the column 42b, which are the clamp fulcrum of the clamp member 40, from interfering with the hot plate 30 described later. For this purpose, the clamp fulcrum is set at a position away from the longitudinal direction of the ventilation pipe 10 using the long stay 42a. The intermediate portion of the stay 42a is supported by a socket 42d that stands on the table T.
On the other hand, the lower clamp 44 of the clamp member 40 is installed at a fixed position on the table T through the support frame 46 (FIG. 2).

The clamp member 50 that holds the resonator 20 includes an upper clamp 52 and a lower clamp 54 that hold the outer surface of the resonator 20 from above and below. The upper clamp 52 is supported on the lower clamp 54 side by a support frame (not shown) having a predetermined structure having a clamp fulcrum. The lower clamp 54 can be moved in the direction of moving toward and away from the clamp member 40 (the left-right direction in FIG. 2) together with the upper clamp 52 by the drive mechanism 60 shown in FIG.
That is, as shown in FIG. 2, the support frame 56 of the lower clamp 54 is supported by the movable body 62, and the movable body 62 can move in the left-right direction in FIG. 2 along the rail 64 on the table T. The movable body 62 moves on the rail 64 by receiving the driving force of the air cylinder 66 that is the driving source of the driving mechanism 60. The amount of movement in the direction in which the movable body 62 (that is, the clamp member 50) approaches the clamp member 40 is regulated by the projection 63 provided on the leading side of the movable body 62 hitting the receiving block 68 on the table T. .

  As shown in FIGS. 2 and 3, a stopper 70 is disposed on the opposite side of the clamp member 50 to the clamp member 50. The stopper 70 includes a contact member 72 fixed to the upper clamp 42 of the clamp member 40 and a receiving member 74 fixed to the table T. The abutting member 72 and the receiving member 74 are in contact with each other and are disposed at positions that do not interfere with the resonator 28 that has already been heat-welded to the ventilation pipe 10. The abutting member 72 and the receiving member 74 are made of a material such as metal having sufficient rigidity.

Next, an operation of joining the ventilation pipe 10 and the resonator 20 by heat welding will be described.
In the apparatus before entering the welding process, due to the movement control of the clamp member 50 by the drive mechanism 60, the joining planned portions 14 and 24 of the vent pipe 10 and the resonator 20 are kept facing each other with a predetermined interval (see FIG. 2 and FIG. 3). In this state, the heat plate 30 provided on the facility side enters between the planned joining portions 14 and 24 of the ventilation pipe 10 and the resonator 20. The hot plate 30 is heated to a temperature equal to or higher than the melting temperature of the ventilation pipe 10 and the resonator 20, and the joining scheduled portions 14 and 24 are heated to the melting temperature. Then, when the planned joining locations 14 and 24 are sufficiently heated to be in a predetermined molten state, the hot plate 30 is retracted from between the planned joining locations 14 and 24.

  Thereafter, by operating the air cylinder 66 of the drive mechanism 60, the clamp member 50 of the resonator 20 is moved toward the clamp member 40 of the ventilation pipe 10. As a result, the planned joining location 24 of the resonator 20 is pressed against the planned joining location 14 of the ventilation pipe 10 and is cooled and welded while being abutted against each other. Note that the movement stroke of the resonator 20 by the air cylinder 66 at this time is regulated by the protrusion 63 of the movable body 62 hitting the receiving block 68. Thereby, the distance between the ventilation pipe 10 and the resonator 20 after welding is managed as a means for ensuring the welding strength of the planned joining locations 14 and 24.

On the other hand, the upper clamp 42 of the clamp member 40 is set at a position where the connection portion between the stay 42a and the support column 42b, which are clamp fulcrums, is separated from the gripping portion of the ventilation pipe 10 for the reason already described. The backlash of the upper clamp 42 accompanying this support structure causes the vent pipe 10 to escape from the resonator 20 due to the applied pressure when the planned joint location 24 of the resonator 20 is pressed against the planned joint location 14 of the vent pipe 10. . Therefore, if the upper clamp 42 has a backlash, the welding strength of the planned joining portions 14 and 24 can be increased even if the distance between the vent pipe 10 and the resonator 20 after welding is controlled by regulating the movement stroke of the resonator 20. It becomes unstable.
However, in the present embodiment, the pressure applied when the planned joining location 24 of the resonator 20 is pressed against the planned joining location 14 of the ventilation pipe 10 is the contact between the contact member 72 constituting the stopper 70 and the receiving member 74. Received by. Thereby, the play of the upper clamp 42 in the clamp member 40 is suppressed, and appropriate welding strength of the planned joining locations 14 and 24 is ensured.

Plan view showing a vent pipe and a resonator Sectional drawing showing the welding preparation state of a ventilation pipe and a resonator. The top view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ventilation pipe 20 Resonator 24 Joining location 30 Hot plate 40 Clamp member 50 Clamp member 52 Upper clamp 60 Drive mechanism 70 Stopper

Claims (2)

A heat-sealing device for a resin molded product that heats and melts a portion to be bonded between a blow-molded product and an injection-molded product with a hot plate, and then presses the portions to be bonded together to weld each other.
Each clamp member that can hold the blow-molded product and injection-molded product individually, and the clamp member of the injection-molded product are moved toward the clamp member of the blow-molded product, and the joining planned part of both molded products is pressed. It is arranged in a state where the blow molding product clamp member is received on the side opposite to the injection molding product clamp member, and the injection molding product joining location is pressed against the blow molding product joining location. And a resin-molded product heat welding apparatus provided with a stopper for receiving the applied pressure when applied. It is the heat welding apparatus of the resin molded product described in Claim 1,
The clamp member of the blow molded product is supported by a stay extending along the longitudinal direction of the blow molded product, and an upper clamp in which a clamp fulcrum is set at the base end of the stay, and a lower clamp supported by a table of the equipment The stopper is a resin-molded product heat welding apparatus comprising a contact member fixed to the upper clamp and a receiving member fixed to the table and receiving the contact member.

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