JP4044021B2 - Manufacturing method of resin parts - Google Patents

Description

The present invention relates to a method for manufacturing a resin component formed by welding and joining resin first and second members together.

Conventionally, resin parts such as a resin case of a fluid pump device are formed by welding and joining resin first and second members together. As such a resin component joining structure, flange portions extending outward are formed at the respective opening side end portions of the respective cylindrical portions of the first and second members, and the first and second portions formed at the respective flange portions. There exists what welds a welding surface (for example, orbital welding) (for example, refer patent document 1). In such a joint structure, the root portion of the flange portion (the portion that bends substantially perpendicularly from the tube portion to the flange portion) has an R shape, so that the stress concentration (maximum stress) at the root portion with respect to the applied pressure during welding is increased. Has been relaxed.
JP 2002-283455 A (FIG. 2)

  By the way, in general, the flange portion as described above is likely to be warped. Specifically, as schematically shown in FIG. 7, flanges extending outward from the respective opening-side end portions in the respective cylinder portions 51 a and 52 a (only a partial cross section is shown) of the first and second members 51 and 52. In general, the portions 51b and 52b tend to warp so as to be separated from each other toward the outer side (lower side in FIG. 7). In FIG. 7, the warping is exaggerated. And this curvature will increase when the base part 53 (the part bent from the cylinder parts 51a and 52a to the flange parts 51b and 52b substantially right-angled) is made into R shape. Therefore, as shown in FIG. 8, after welding, the residual stress based on the warping increases. This causes a decrease in welding strength.

  Further, in the above-described joint structure, since the root portion 53 is formed in an R shape, a welding (pressurizing) jig 54 that is brought into contact with the welding direction of the flange portions 51b and 52b (left and right direction in FIG. 8) is provided. The abuttable position is outside the outer periphery of the cylindrical portions 51a and 52a. Therefore, for example, it is necessary to provide a tapered portion 54a at a position corresponding to the root portion 53 of the jig 54 and to bring the jig 54 into contact with the outside (R-shaped outside) of the outer periphery of the cylindrical portions 51a and 52a. Become. Therefore, it is difficult to uniformly press the entire welding surfaces 51c and 52c with the above configuration, that is, it is difficult to ensure the welding strength. Alternatively, in order to pressurize the entire welding surfaces 51c and 52c uniformly in the above-described configuration, that is, to secure the welding strength, it is necessary to form the welding surfaces 51c and 52c on the outside. In addition, forming the welding surfaces 51c and 52c on the outer side lengthens the extending amount of the flange portions 51b and 52b, and causes the outer shape to increase.

The present invention has been made in order to solve the above-mentioned problems, and the object thereof is to reduce the residual stress based on the warp of the flange portion on which the welding surface is formed, and to improve the welding strength. It is providing the manufacturing method of the resin component which can be manufactured .

In the first aspect of the present invention, the first flange portion extending outward is formed at the opening side end portion of the cylindrical portion of the first member made of resin, and the front end surface of the protruding portion formed in the first flange portion a certain the first welding surface, the production method of the resin part is formed by a second weld surface is the tip surface of the protruding portion formed in the second resin member joining by welding, the In the tube portion, a groove portion that is recessed toward the inside of the tube portion is formed at the base portion of the first flange portion, and the first and second welding surfaces are welded before the first and second welding surfaces. A forming step of forming a concave portion in an intermediate portion of at least one of the second welding surfaces and forming a flat portion on a side portion of the concave portion; and a welding step of orbital welding the first and second welding surfaces. The

( Function)
According to the invention described in claim 1, said tube portion, the root portion of the first flange portion, since the groove is recessed toward the inside of the cylindrical portion is formed, the rigidity of that portion Since the strength of the first flange portion becomes weak, the residual stress based on the warpage after welding becomes small. Therefore, the welding strength can be improved. And the welding jig contact | abutted in the welding direction of a 1st flange part can be made to contact | abut the inner side of a flange part compared with a prior art (a base part is a thing of R shape). Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced). Alternatively, the first welding surface can be formed on the inner side of the conventional technique (having the R-shaped base) while ensuring the same welding strength as that of the conventional technique (having the R-shaped root).
Moreover, since a recessed part is formed in the intermediate part in at least one of the 1st and 2nd welding surfaces at a formation process, a 1st and 2nd welding surface is welded favorably at a welding process. In addition, since a flat portion is formed on the side of the recess in the molding process, when orbital welding is performed in the welding process, the first welding surface or the second welding surface is vibrated so as to draw a minute circle. In addition, the first welding surface and the second welding surface can always be brought into contact with each other in the circumferential direction, and variations in the applied pressure can be suppressed. Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced).

According to the present invention described in claim 1, residual stress welding surface is based on the warpage of the flange portion formed can be reduced, Ru can improve weld strength.

  Hereinafter, an embodiment in which the present invention is embodied in a fluid pump device for circulating cooling water at idle stop will be described with reference to FIGS. As shown in FIG. 1, the fluid pump device includes a motor side case 1 as a first member, a motor side cover 2, a pump side case 3 as a second member, a motor body 4, and an impeller member 5. Prepare. In the present embodiment, the motor side case 1 and the pump side case 3 constitute a resin case.

  The motor side case 1 is made of resin, and includes a cylindrical portion 1a as a substantially cylindrical cylindrical portion, and a partition wall 1b that partitions the inside thereof. The partition wall 1b of the present embodiment includes a disk part 1c extending radially inward from one opening side end K1 of the cylindrical part 1a, and the other opening side of the cylindrical part 1a from the disk part 1c (right side in FIG. 1). ) And a bottom 1e that closes the tip of the small-diameter cylinder 1d. At the center of the bottom portion 1e, a support cylinder portion 1f extending to one opening side (left side in FIG. 1) of the cylindrical portion 1a is erected. The motor-side case 1 is partitioned by a partition wall 1b so that a motor housing portion 1g for housing the motor main body 4 and a pump chamber constituting a part of a pump chamber P described later are included therein. A component 1h is formed.

  The motor main body 4 is accommodated in the motor accommodating portion 1g formed on the other opening side (right side in FIG. 1) of the cylindrical portion 1a, and the motor side cover 2 is disposed on the other opening side end portion of the cylindrical portion 1a. Is fixed. The motor body 4 of the present embodiment is a direct current motor, and includes a yoke 11, a stator magnet 12 fixed to the inner peripheral surface of the yoke 11, and an armature 13 disposed inside the stator magnet 12. The armature 13 has a rotating shaft 14, and one end of the rotating shaft 14 is supported by a bearing 15 fixed to the bottom 1 e of the partition wall 1 b and the other end is fixed to the motor side cover 2. It is supported so that it can rotate. An outer ring magnet 17 that is one of coupling magnets is fixed to one end side of the rotating shaft 14 via a collar. The outer ring magnet 17 includes a disc portion 17a extending radially outward of the rotating shaft 14, a cylindrical portion 1a of the motor-side case 1 extending from the outer edge of the disc portion 17a, and a small-diameter cylindrical portion 1d of the partition wall 1b. The cylinder part 17b arrange | positioned in the clearance gap between.

  The pump side case 3 is fixed to one opening side end K1 of the cylindrical portion 1a in the motor side case 1. The pump side case 3 is made of resin and has a pump cylinder part 3a as a substantially cylindrical cylinder part, and an inflow cylinder part 3b extending from one end side (left side in FIG. 1) of the pump cylinder part 3a while reducing the diameter. And an outflow cylinder portion 3c extending outward (in FIG. 1, the back side of the drawing) so as to communicate the hole formed in the peripheral wall of the pump cylinder portion 3a with the outside. And the opening side end K2 of the pump cylinder part 3a in the pump side case 3 is fixed to one opening side end K1 of the cylindrical part 1a in the motor side case 1, whereby the pump chamber constituting part 1h and the pump side A pump chamber P is formed by the inner surface of the case 3.

  An impeller member 5 is accommodated in the pump chamber P. The impeller member 5 includes an impeller body 21 and an inner ring magnet 22 that is the other of the coupling magnets. The impeller body 21 is disposed in the pump cylinder portion 3a, the impeller portion 21a disposed inside the pump cylinder portion 3a, and the pump chamber constituting portion 1h (between the small diameter cylinder portion 1d and the support cylinder portion 1f) extending from the impeller portion 21a. The cylindrical inner ring magnet 22 is fitted on the outer peripheral surface of the impeller cylinder portion 21b. The impeller member 5 is rotatably supported via a bearing 24 by a support shaft 23 supported by the support cylinder portion 1f of the inner peripheral surface of the impeller portion 21a. The impeller portion 21a is formed by connecting a plurality of wing portions arranged in an annular shape. When the impeller portion 21a is rotated, the impeller portion 21a draws fluid existing in the axial direction and radiates radially outward.

  The fluid pump device according to the present embodiment is provided with a mechanical pump (which is driven based on engine driving and circulates cooling water) in a vehicle adopting the idle stop system, and is in idle stop ( Cooling water is circulated when the engine is not driven. Specifically, the fluid pump device is for ensuring a heating function in the vehicle interior at the time of idling stop. Even if the mechanical pump is stopped at the same time as idling stop, the fluid pump device is driven at the idling stop and is heated (heated). It is for flowing cooling water. That is, in the fluid pump device, the inflow cylinder portion 3b and the outflow cylinder portion 3c are connected to a cooling water pipe communicating with the heater core or the like.

  Here, the opening side end K1 of the cylindrical portion 1a in the motor side case 1 and the opening side end K2 of the pump cylinder portion 3a in the pump side case 3 are a motor side welding surface 31 as a first welding surface, The pump side welding surface 32 as the second welding surface is fixed by welding (in this embodiment, orbital welding) (see FIGS. 2 to 4).

  Specifically, as shown in FIG. 3, a motor side flange portion 33 as a first flange portion extending radially outward is formed at the opening side end portion K1 of the motor side case 1 (cylindrical portion 1a). A motor-side welding projection 34 that slightly projects in the axial direction (side on which the pump-side case 3 is disposed) is formed in an annular shape at the radial intermediate portion of the motor-side flange portion 33, and the tip surface thereof is The motor side welding surface 31 is used. The motor-side welding surface 31 is formed with a concave portion 31a in the middle portion thereof before the welding (see FIG. 3) and a side portion of the concave portion 31a (in the embodiment, the cylindrical portion 1a). The flat portion 31b is formed on the inner side and the outer side. The recess 31a is formed in an arc shape so as to be deeper toward the center of the cylindrical portion 1a in the radial direction, and is formed in an annular shape over the entire circumference of the cylindrical portion 1a. Further, on the radially outer side of the motor-side flange portion 33, an outer protruding wall 35 that protrudes larger than the motor-side welding protruding portion 34 in the axial direction (side on which the pump-side case 3 is disposed) is formed in an annular shape. Yes. Further, on the radially inner side of the motor side flange portion 33, an inner protruding wall 36 that protrudes larger than the motor side welding protruding portion 34 in the axial direction (side on which the pump side case 3 is disposed) is formed in an annular shape. Yes. In addition, an innermost protruding wall 37 that protrudes further in the axial direction (side on which the pump-side case 3 is disposed) in the axial direction (side on which the pump-side case 3 is disposed) is annular at the opening end K1 on the radially inner side of the inner protruding wall 36. Is formed.

  Further, the cylindrical portion 1a in the root portion 38 of the motor-side flange portion 33 is formed with a groove portion 39 that is recessed on the inner side. The groove portion 39 is formed in an annular shape along the root portion 38 of the motor side flange portion 33, that is, over the entire circumference of the cylindrical portion 1a. Further, the groove 39 is formed in a semicircular shape.

  On the other hand, as shown in FIG. 3, a pump-side flange portion 40 as a second flange portion extending radially outward is formed at the opening-side end K2 of the pump-side case 3 (pump cylinder portion 3a). In the present embodiment, the pump-side flange portion 40 extends outward in the radial direction via a stepped portion 41 that is partially formed in the circumferential direction. A pump-side welding projection 42 projecting in the axial direction (side on which the motor-side case 1 is disposed) is formed in an annular shape in the radial intermediate portion of the pump-side flange portion 40, and the tip surface thereof is the pump. A side welding surface 32 is provided.

  Further, the pump cylinder portion 3a in the base portion 43 of the pump side flange portion 40 is formed with a groove portion 44 that is recessed on the inner side. The groove portion 44 is formed in an annular shape along the root portion 43 of the pump-side flange portion 40, that is, over the entire circumference of the pump cylinder portion 3a. Further, the groove 44 is formed in a semicircular shape.

  In this embodiment, the thicknesses L1 and L2 (in the axial direction) of the motor side flange portion 33 and the pump side flange portion 40 are the widths of the motor side welding surface 31 and the pump side welding surface 32 (in the radial direction). It is set smaller than L3 and L4. In the present embodiment, the width L3 (in the radial direction) of the motor-side welding surface 31 is set slightly smaller than the width L4 (in the radial direction) of the pump-side welding surface 32. In the present embodiment, the radially inner end of the motor-side welding surface 31 is arranged slightly radially outside the outer periphery of the cylindrical portion 1a, and the radially inner end of the pump-side welding surface 32 is the pump cylinder portion. 3a (stepped portion 41) is arranged slightly outside in the radial direction from the outer periphery.

  Then, in the welding step, as shown in FIG. 4, jigs 45 and 46 are first brought into contact with the opposite sides of the motor side flange portion 33 and the pump side flange portion 40 (in the welding direction), respectively, and the jigs are fixed. The tools 45 and 46 pressurize (press contact) the motor-side welding surface 31 (plane portion 31b) and the pump-side welding surface 32. The jig 45 abuts from the outer peripheral position of the cylindrical portion 1a (a position matching the outer periphery of the cylindrical portion 1a when viewed from the axial direction) to the outer edge of the motor side flange portion 33. Further, the jig 46 extends from the outer peripheral position of the pump cylinder portion 3a (stepped portion 41) (position matching the outer periphery (stepped portion 41) of the pump cylindrical portion 3a as viewed from the axial direction) to the outer edge of the pump side flange portion 40. Abutted. Then, in this state, the motor side case 1 or the pump side case 3 is vibrated in a horizontal direction (on the surface perpendicular to the axis) so as to draw a minute circle, whereby the motor side welding surface 31 and the pump side welding surface 32 are obtained. The resin of the motor side welding projection 34 and the pump side welding projection 42 is melted, and both members are welded (see FIG. 2). At this time, the outer projecting wall 35, the inner projecting wall 36, and the innermost projecting wall 37 are close to the opposing member (pump side flange portion 40, etc.) and substantially pass through the passage (internal and external). Blocks and prevents burrs from being scattered during welding.

  In the fluid pump device configured as described above, for example, when the vehicle is stopped by a signal or the like, idle stop is performed and the mechanical pump is stopped, power is supplied to the motor body 4 and the armature 13 is rotationally driven. Then, the outer ring magnet 17 is rotated together with the rotating shaft 14, and the impeller member 5 is rotated by the magnetic action between the outer ring magnet 17 that is a coupling magnet and the inner ring magnet 22. Then, the cooling water (fluid) on the inflow cylinder part 3b side is drawn into the pump chamber P and discharged to the outflow cylinder part 3c side. Therefore, the (cooled) cooling water is supplied to the heater core, and the heating function in the vehicle compartment is ensured even during idling stop.

Next, characteristic effects of the above embodiment will be described below.
(1) The cylindrical portion 1a of the root portion 38 of the motor-side flange portion 33 is formed with a groove portion 39 that is recessed on the inner side, so that the rigidity at that portion becomes weak, for example, the motor-side flange portion. Even if 33 is warped at the time of molding, the warping force is weakened, and the residual stress based on the warping after welding is reduced. Therefore, it is possible to improve the welding strength while maintaining the strength of the portion other than the opening side end portion K1 of the cylindrical portion 1a. In addition, the welding jig 45 abutted in the welding direction of the motor-side flange portion 33 is located closer to the inner side of the motor-side flange portion 33 (cylindrical) than the conventional technique (the root portion has an R shape). It is possible to make contact with the outer peripheral position of the portion 1a (up to a position matching the outer periphery of the cylindrical portion 1a when viewed from the axial direction). Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced). Alternatively, the motor-side welding surface 31 can be formed on the inner side of the conventional technique (having the R-shaped base) while ensuring the same welding strength as that of the conventional technique (having the R-shaped root). Therefore, the extension amount of the motor side flange portion 33 can be shortened, and the outer shape (of the fluid pump device) can be reduced.

  (2) Since the pump cylinder part 3a in the base part 43 of the pump side flange part 40 is formed with a groove part 44 that is recessed on the inner side, the rigidity at that part is weakened. Even if the portion 40 is warped during the molding, the warping force is weakened, and the residual stress based on the warping after welding is reduced. Therefore, it is possible to improve the welding strength while maintaining the strength of the portion other than the opening side end portion K2 of the pump cylinder portion 3a. Moreover, the welding jig 46 abutted in the welding direction of the pump side flange portion 40 is located closer to the inner side of the pump side flange portion 40 (pump than the conventional technique (the root portion is R-shaped)). The outer peripheral position of the cylindrical portion 3a (stepped portion 41) (up to the outer peripheral position of the pump cylindrical portion 3a (stepped portion 41) when viewed from the axial direction) can be brought into contact. Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced). Alternatively, the pump-side welding surface 32 can be formed on the inner side of the conventional technique (having the R-shaped base) while ensuring the same welding strength as that of the conventional technique (having the R-shaped root). Therefore, the extending amount of the pump-side flange portion 40 can be shortened, and the outer shape (of the fluid pump device) can be reduced.

  (3) Since the groove portions 39 and 44 are semicircular, they can be easily formed and stress concentration (maximum stress) in the vicinity of the portions can be reduced. Therefore, damage near the groove portions 39 and 44 is reduced.

  (4) In the molding process before welding (see FIG. 3), a concave portion 31a is formed in the intermediate portion of the motor-side welding surface 31 and a side portion of the concave portion 31a (in the embodiment, the cylindrical portion). A flat portion 31b is formed on the inner side and the outer side of 1a. As described above, it is generally known that when the concave portion 31 a is formed in the intermediate portion of the motor side welding surface 31, orbital welding is favorably performed from the side portion side of the motor side welding surface 31. Further, in the generally known conventional one (see FIG. 7), since the recess 51d is formed so as to be deeper toward the center of the welding surface 51c, the welding surfaces 51c and 52c are formed at the initial stage of welding. When line contact is made and vibration is performed so as to draw a minute circle, a part of the welding surface 51c in the circumferential direction is separated from the welding surface 52c, and there is a possibility that the welding pressure varies and the welding strength is lowered. On the other hand, in the above configuration, since the flat portion 31b is formed on the side portion of the recess 31a and the flat portion 31b is in surface contact with all portions in the circumferential direction, when orbital welding is performed in the welding step, the motor side welding is performed. Even if the surface 31 or the pump-side welding surface 32 is vibrated so as to draw a minute circle, a part of the plane portion 31b in the circumferential direction can be prevented from being separated from the pump-side welding surface 32. That is, the motor-side welding surface 31 and the pump-side welding surface 32 can always be brought into contact with each other in the circumferential direction, and variations in the applied pressure can be suppressed. Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced).

  (5) Since the thicknesses L1 and L2 of the motor side flange portion 33 and the pump side flange portion 40 are set smaller than the widths L3 and L4 of the motor side welding surface 31 and the pump side welding surface 32, the motor side flange portion 33 and Even if the pump-side flange portion 40 is warped during molding, the warping force is weakened, and the residual stress based on the warping after welding is further reduced. Therefore, the welding strength can be improved.

The above embodiment may be modified as follows.
In the above embodiment, the grooves 39 and 44 are semicircular, but may be changed to other shapes. For example, as shown in FIG. 5, it may be changed to V-shaped grooves 47 and 48. Further, in the groove portions 47 and 48 in this example (see FIG. 5), the deep portions 47a and 48a have an R shape. Further, for example, as shown in FIG. 6, it may be changed to wedge-shaped grooves 49 and 50. Further, in the groove portions 49 and 50 in this example (see FIG. 5), the deep portions 49a and 50a have an R shape. Even if it does in this way, while being able to form easily, the stress concentration (maximum stress) of the vicinity (groove part 47-50) vicinity can be relieve | moderated.

  In the above embodiment, the motor-side flange portion 33 and the pump-side flange portion 40 are formed at the opening-side end portions K1 and K2, respectively. However, it is sufficient that at least one flange portion is formed. That is, the other may be changed to other shapes such as those in which the flange portion is not formed and the opening side end portion is used as a welding surface as it is. Even in this case, at least one of the effects (1) and (2) of the above embodiment can be obtained.

  In the above embodiment, the recesses 31a and the flat surface 31b are formed on the motor-side welding surface 31 in the molding process before welding (see FIG. 3). It may be changed. For example, you may change the motor side welding surface 31 whole into a plane. Moreover, you may form the recessed part and plane part similar to the said recessed part 31a and the plane part 31b in the pump side welding surface 32. FIG.

  In the above embodiment, the thicknesses L1 and L2 of the motor side flange portion 33 and the pump side flange portion 40 are set to be smaller than the widths L3 and L4 of the motor side welding surface 31 and the pump side welding surface 32. For example, the thicknesses L1 and L2 may be set larger than the widths L3 and L4.

  The outer projecting wall 35, the inner projecting wall 36, and the innermost projecting wall 37 of the above embodiment are projected from the opening side end K1 side of the motor side case 1, but the opening side end of the pump side case 3 You may change so that it may protrude from K2 side, and it is good also as a structure which does not form them.

  The opening side end K1 and the opening side end K2 of the above embodiment are fixed by orbital welding of the motor side welding surface 31 and the pump side welding surface 32, but other welding is performed. May be fixed.

  In the embodiment described above, the fluid pump device for circulating the cooling water at the time of idling stop is embodied. However, it may be changed to a fluid pump device used for other applications. Moreover, as long as it welds the 1st and 2nd member, you may materialize to other resin components (for example, resin-made containers etc.).

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof .

(B) Orbital and a second weld surface is the tip surface of the first weld surface and a second projecting portion formed on the resin member is a distal end surface of the first projecting portion formed on the resin member welding A method of welding resin parts, wherein a molding step of forming a concave portion in an intermediate portion of at least one of the first and second welding surfaces and forming a flat portion on a side portion of the concave portion before welding, And a welding step of orbital welding the first and second welding surfaces. If it does in this way, since a crevice is formed in an intermediate part in at least one of the 1st and 2nd welding surfaces in a forming process, the 1st and 2nd welding surfaces are favorably welded in a welding process. In addition, since a flat portion is formed on the side of the recess in the molding process, when orbital welding is performed in the welding process, the first welding surface or the second welding surface is vibrated so as to draw a minute circle. In addition, the first welding surface and the second welding surface can always be brought into contact with each other in the circumferential direction, and variations in the applied pressure can be suppressed. Therefore, the welded portion can be more uniformly pressed and welded, and as a result, the weld strength can be improved (the dispersion of the weld strength can be reduced).

The principal part sectional drawing of the fluid pump apparatus in this Embodiment. Sectional drawing which shows the opening side edge part in this Embodiment. Sectional drawing which shows the opening side edge part before welding in this Embodiment. Sectional drawing which shows the opening side edge part at the time of the welding process in this Embodiment. Sectional drawing which shows the opening side edge part in another example. Sectional drawing which shows the opening side edge part in another example. Sectional drawing which shows the opening side edge part before welding in a prior art. Sectional drawing which shows the opening side edge part in a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor side case (1st member), 1a ... Cylindrical part (cylinder part), 3 ... Pump side case (2nd member), 3a ... Pump cylinder part (cylinder part), 31 ... Motor side welding surface (1st Welding surface), 32 ... pump side welding surface (second welding surface), 33 ... motor side flange portion (first flange portion), 38, 43 ... root portion, 39, 44, 47-50 ... groove portion, 40 ... pump Side flange portion (second flange portion), 42... Groove portion, 47a to 50a... Deep portion, K1, K2.

Claims (1)

A first flange portion extending outward is formed at an opening side end portion of the cylindrical portion of the first resin member, and a first welding surface which is a front end surface of a protruding portion formed on the first flange portion, and a resin-made first member A method of manufacturing a resin component formed by welding and joining a second welding surface which is a tip surface of a protrusion formed on the second member of the second member,
In the tube portion, a groove portion that is recessed toward the inside of the tube portion is formed at the base portion of the first flange portion ,
Before forming the first and second welding surfaces, forming a recess in an intermediate portion of at least one of the first and second welding surfaces and forming a flat portion on the side of the recess; and A resin component manufacturing method comprising: a welding step of orbital welding the first and second welding surfaces .

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