JP2014188673A - Vibration welding method and vibration welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration welding method capable of effectively removing internally generated welding dust when the body part of an intake manifold is vibration welded to a cover.SOLUTION: An intake manifold 1 includes a body part 4 composed of a lower case and an upper case. The collector part 6 of the body part 4 is covered with a cover 5, and both are integrated by vibration welding. On this occasion, compressed air is injected from the open end of each branch part 7 of the body part 4 through an air blow nozzle. On the other hand, a negative pressure suction force is applied to the interior of the collector part 6 from the open end of the collector part 6, through a suction nozzle 17. Due to the synergistic effect of the air blow and the negative pressure suction force, the welding dust generated by vibration welding can be efficiently collected.

Description

  The present invention relates to a vibration welding method that is one of the methods for joining resin parts and a vibration welding apparatus therefor.

  The vibration welding method is a method in which vibration is applied to the abutting portion between the resin parts to be welded and locally melted by the frictional heat to be welded. ”And resin powder (these are collectively referred to as welding powder). The generation of such welding powder is not only unfavorable for environmental hygiene, but also adheres to a positioning jig at the time of welding or adheres to the product itself, which causes a secondary failure.

  Then, as described in Patent Document 1, as a countermeasure against the above-mentioned welding powder, air is blown from an air blowing device toward a pressing jig or a product, or the welding powder is removed, or Patent Document 2 Has been proposed in which a suction pipe having a large number of suction holes is arranged around the upper and lower mating portions to suck and remove the welding powder.

JP 2001-225387 A JP 2004-66740 A

  However, in the techniques described in Patent Documents 1 and 2, for example, when one member and the other member constituting a duct-shaped hollow container having both ends opened are welded to each other, The removal of the generated welding powder cannot be dealt with, and there is still room for improvement.

  The present invention has been made paying attention to such a problem, and when vibrating and welding one member and the other member constituting a duct-shaped hollow container having both ends open, the inside of the hollow container is formed. It is an object of the present invention to provide a vibration welding method and a vibration welding apparatus capable of effectively removing welding powder generated in the above.

  In the present invention, after joining the joints of one member and the other member to form a resin hollow container having both ends opened and restrained by pressure, vibration is applied in the pressure restrained state. By virtue of the above, the vibration welding method is adapted to perform vibration welding on the butted portion between the joint portions, wherein the butted portion between the joint portions faces the hollow portion of the hollow container, and one of the hollow containers is opened. While compressed air is blown into the hollow portion from the end portion, vibration welding is performed while applying a negative pressure suction force to the hollow portion from the other open end portion of the hollow container.

  In this case, the negative pressure suction force is a negative pressure suction force generated by a suction device such as a dust collector.

  Preferably, considering that vibration is applied to members joined by vibration welding, an air blow nozzle is provided at a predetermined distance from one open end of the hollow container as described in claim 2. While the compressed air is blown in a non-contact manner, a negative pressure suction force is applied by facing the suction nozzle in a non-contact manner with a predetermined distance from the other open end of the hollow container.

  When the hollow container is made of resin containing reinforcing fibers and is an intake manifold for a multi-cylinder internal combustion engine, the open ends of the respective branch portions are provided. While the compressed air is blown in a non-contact manner with an independent air blow nozzle facing the part at a predetermined distance, the single open end of the collector part shared by each branch part is spaced a predetermined distance away The suction nozzle is made to face each other in a non-contact manner to apply a negative pressure suction force.

  Therefore, in at least the invention described in claim 1, since the flow of compressed air by air blow and the flow of air by negative pressure suction force are formed along the longitudinal direction of the hollow container, Due to the synergistic effect with the negative pressure suction force, the welding powder generated inside the hollow container can be effectively removed.

  According to the present invention, due to the synergistic effect of the air blow and the negative pressure suction force, the welding powder generated inside the hollow container can be effectively removed, and the cleaning process inside the product in the subsequent process can be eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the product used as the object by vibration welding which concerns on this invention, and is decomposition | disassembly explanatory drawing which shows the structure of the intake manifold for multicylinder internal combustion engines. FIG. 2 is a longitudinal sectional explanatory view of a vibration welding apparatus for the intake manifold shown in FIG. 1. Plane explanatory drawing of the vibration welding apparatus containing the negative pressure suction part shown in FIG. Explanatory sectional explanatory drawing of the air blow part shown in FIG. FIG. 4 is an enlarged explanatory view of the negative pressure suction part shown in FIG.

  1 to 5 show a more specific form for carrying out the vibration welding method according to the present invention. In particular, FIG. 1 shows the structure of an intake manifold for a multi-cylinder internal combustion engine as a product example to be subjected to vibration welding. ing.

  The intake manifold 1 shown in FIG. 1 has a shape like a duct-like hollow container opened at both ends, and is roughly divided into three parts, a lower case 2, an upper case 3, and a cover 5. The main body 4 of the intake manifold 1 is formed by vibration welding the upper case 3, and then the cover 5 is vibration welded to the main body 4. Any material of the lower case 2, the upper case 3, and the cover 5 is a polyamide resin including a reinforcing fiber (filler) represented by nylon 6 (registered trademark), for example. As described above, the intake manifold 1 including the lower case 2, the upper case 3 and the cover 5 includes a plurality of independent branch portions 7 for each cylinder in addition to the deformed box-shaped collector portion (surge tank portion) 6. Thus, the upper surface of the collector unit 6 is closed by the cover 5.

  A flange portion 8 for coupling with a cylinder head (not shown) is integrally formed at the end portion of each branch portion 7, and a coupling with a throttle body (not shown) is formed at the end portion of the collector portion 6. The flange portion 9 is formed integrally with each other, and these flange portions 8 and 9 are open end portions opened to the outside. In addition to the flange portion 9, the collector portion 6 is opened to the outside by a window portion 10 that is formed in the side wall equivalent portion of the upper case 3 in FIG. 1.

  FIG. 2 is a schematic cross-sectional view of the vibration welding apparatus for the intake manifold 1, and FIG. 3 is a schematic plan view of the main part of the vibration welding apparatus. Here, as shown in FIG. 1, the main body 4 of the intake manifold 1 is formed by vibration welding the lower case 2 and the upper case 3 in advance. The cover 5 is vibration welded.

  As shown in FIG. 2, a lower welding jig 12 is fixed on a solid base 11, and an upper welding jig 13 is disposed to face the lower welding jig 12 that can be raised and lowered. Then, in a state where the lower welding jig 12 is lowered, the main body portion 4 of the intake manifold 1 is positioned on the plurality of positioning blocks 14 on the lower welding jig 12 and the cover 5 is placed on the upper welding jig 13. In this state, the lower welding jig 12 is raised to restrain the main body 4 and the cover 5 from below. In this case, as is well known, a convex bead portion is formed in advance in at least one of the joint portions of the main body portion 4 and the cover 5, and the bead portion is abutted against the other side. It shall be used for vibration welding.

  In such a pressure restraint state, for example, when vibration with a predetermined amplitude as indicated by an arrow F in FIG. 3 is applied to the cover 5 by the upper welding jig 13, the butt portion between the main body 4 and the cover 5 is formed. By locally melting with frictional heat due to vibration addition, they are welded together, and both are integrated.

  As shown in FIG. 2, the frame 11 that supports the lower welding jig 12 is opposed to the flange portion 8 that is an open end portion of each branch portion 7 in the main body portion 4. A plate-like nozzle holder 15 is provided along the parallel direction. As shown in FIG. 4 in addition to FIG. 2, the nozzle holder 15 is provided with an air blow nozzle 16 independent for each branch portion 7 so as to face the inside of the open end of each branch portion 7. Each air blow nozzle 16 is not in contact with the flange portion 8, which is the open end of each branch portion 7, by a predetermined distance C 1, even though the air blow direction is directed toward the inside of the branch portion 7. Each air blow nozzle 16 is connected to a compressed air supply source (not shown), and so-called air blow is performed by blowing compressed air toward the inside of each branch portion 7.

  On the other hand, as shown in FIG. 3, a metal suction nozzle 17 is provided on the lower welding jig 12 so as to face the flange portion 9 which is an open end portion on the main body portion 4 side. The suction nozzle 17 is also disposed so as to face the flange portion 9 in a non-contact manner with a predetermined distance C2. As shown in FIG. 5, the suction nozzle 17 is, for example, a stainless steel elbow, and is connected to a dust collector (not shown) that is a suction device (negative pressure suction source) via a static electricity (charging) prevention hose 18. In addition, a protector 19 formed by cutting a static electricity (charging) prevention hose is attached to a portion facing the flange portion 9 in FIG. Thereby, even if the suction nozzle 17 is not in contact with the flange portion 9 that is the open end portion on the main body portion 4 side, the negative pressure suction force by the dust collector can be exerted on at least the inside of the main body portion 4. Yes.

  Therefore, according to the vibration welding apparatus configured as described above, as shown in FIGS. 2 and 3, while the relative positioning of the main body 4 and the cover 5 of the intake manifold 1 is performed, both of them are attached to the lower welding jig 12. And the upper welding jig 13 are pressed and constrained, and vibration with a predetermined amplitude in the direction of arrow F in FIG. 3 is applied for a predetermined time, whereby the main body 4 and the cover 5 are welded and integrated.

  At that time, prior to the application of vibration, so-called air blowing is performed by blowing compressed air from the air blow nozzles 16 of FIG. It is assumed that a negative pressure suction force is applied from the suction nozzle 17 to the inside of the collector portion 6 and vibration welding is performed by applying vibration as described above in the dust collection state. The so-called dust collection using the air blow and the negative pressure suction force as described above is continued until the vibration welding is completed.

  In this case, the air blow nozzle 16 and the suction nozzle 17 are not in contact with the main body portion 4 of the intake manifold 1 by a predetermined distance C1 or C2, so even if vibration is applied to the main body portion 4. The air blow nozzle 16 and the suction nozzle 17 do not collide with the main body portion 4, and the main body portion 4 side is not damaged or abnormal noise is not generated.

  As a result, as indicated by an arrow M in FIGS. 2 and 3, the intake manifold 1 during vibration welding has an open end portion on the collector portion 6 side from the flange portion 8 which is an open end portion of each branch portion 7. A highly directional air flow toward the flange portion 9 is formed. At the same time, a highly directional air flow from the window portion 10 to the flange portion 9 in FIG. The portion of the main body 4 and the cover 5 that actually participates in welding faces the above-described air flow, and the portion of the air that actually participates in welding also has the above-described air flow. Will reach.

  Therefore, the welding powder generated with vibration welding between the main body 4 and the cover 5 is separated from the main body 4 and the like so as to be blown off by air blow, and is sucked to the dust collector side by the negative pressure suction force. The main body 4 and the cover 5 are not left attached.

  The air blow nozzle 16 and the suction nozzle 17 are not in contact with the main body portion 4 of the intake manifold 1 by a predetermined distance C1 or C2, so that the compressed air blown from the air blow nozzle 16 is sucked (suction). As a result, suction of outside air from the flange portion 8 side of each branch portion 7 can be actively promoted, and outside air can also be actively sucked from the window portion 10 of the collector portion 6 shown in FIG. .

  Here, in parallel with positive suction of outside air from the window portion 10 of the collector portion 6 as described above, the collector portion 6 is accompanied by several pipes (not shown). Since the kind is open to the atmosphere, the outside air can be actively sucked into the collector section 6 by these pipes.

  For this reason, in particular, the collector portion 6 does not become a vacuum state in the sealed space, and the air flow is always formed in the collector portion 6 in a fluid state by the synergistic effect of the air blow and the negative pressure suction force. Then, the negative pressure suction force is applied evenly to every corner of the collector portion 6, and the welding powder in the collector portion 6 can be sucked and removed effectively.

  As described above, as the material of the main body 4 and the cover 5 of the intake manifold 1, a polyamide resin including a reinforcing fiber (filler) represented by nylon 6 (registered trademark) is employed. In this case, the generation of fibrous welding powder is unavoidable due to vibrational friction at the part that actually participates in welding, but these welding powder can also be effectively sucked and removed.

  As described above, according to the present embodiment, when vibration welding is performed between the main body 4 and the cover 5 of the intake manifold 1, dust collection using both air blow and negative pressure suction force is performed through the internal space of the main body 4. As a result, the welding powder generated inside the main body 4 during vibration welding can be effectively collected in parallel with the vibration welding, so that cleaning in the post-process after vibration welding can be abolished and man-hours can be reduced. I can plan. In addition, since suction is performed while blowing air using vibration applied to the main body 4, the welding powder can be sucked and removed while effectively dropping, and welding powder generated outside the main body 4 is suppressed. Therefore, adhesion to a jig or the like can be prevented, and environmental hygiene is preferable.

  Here, in the above embodiment, the case where the main body 4 and the cover 5 of the intake manifold 1 shown in FIG. 1 are welded by vibration is illustrated, but the lower case 2 and the upper that constitute the main body 4. The present invention can be applied to vibration welding of the case 3, and the present invention can also be applied to vibration welding of hollow workpieces of the same type other than the intake manifold 1.

1 ... Intake manifold (hollow container)
DESCRIPTION OF SYMBOLS 2 ... Lower case 3 ... Upper case 4 ... Main-body part 5 ... Cover 6 ... Collector part 7 ... Branch part 16 ... Air blow nozzle 17 ... Suction nozzle

Claims (4)

After joining the joints of one member and the other member to pressurize and constrain each other, which constitutes a resin hollow container having both ends opened, by applying vibration in the pressure constrained state, the above A vibration welding method in which vibration welding is performed on a butt portion between joints,
The butted portion between the joints faces the hollow portion of the hollow container,
While the compressed air is blown into the hollow part from one open end of the hollow container, vibration welding is performed while applying a negative pressure suction force from the other open end of the hollow container into the hollow part. Vibration welding method. While blowing compressed air with the air blow nozzle facing non-contact over a predetermined distance with respect to one open end of the hollow container,
2. The vibration welding method according to claim 1, wherein a suction pressure is applied to the other open end of the hollow container at a predetermined distance so as to contact the suction nozzle in a non-contact manner. The hollow container is made of resin containing reinforcing fibers, and is an intake manifold for a multi-cylinder internal combustion engine,
While the compressed air is blown in a non-contact manner by facing an independent air blow nozzle at a predetermined distance from the open end of each branch part,
3. A negative pressure suction force is applied to a single open end portion of a collector portion shared by each branch portion with a predetermined distance and a suction nozzle facing each other in a non-contact manner. The vibration welding method described in 1. After joining the joints of one member and the other member to pressurize and constrain each other, which constitutes a resin hollow container having both ends opened, by applying vibration in the pressure constrained state, the above A vibration welding apparatus adapted to perform vibration welding on a butt portion between joints,
An air blow nozzle for blowing compressed air into the inside from one open end of the hollow container is arranged to face the one open end with a predetermined distance in a non-contact manner,
A suction nozzle for applying a negative pressure suction force to the inside from the other open end of the hollow container is disposed in a non-contact manner with a predetermined distance from the other open end. Vibration welding equipment to do.

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