Fastening method and fastening device

Abstract

The purpose of the present invention is to reduce the number of parts, and to improve the rigidity and the sealing performance of a vehicle body constituting article of a vehicle. The fastening method comprises the following steps: measuring the size of the side beam (21); a step for measuring the dimensions of the casting (22); a step of selecting a gasket (24) to be assembled to the side beam (21); a step of assembling a gasket (24) to the side beam (21); a step of assembling the side beam (21) and the casting (22); a step of fastening the side beam (21) to the gasket (24) and fastening the side beam (21) to the casting (22); and a step for injecting an adhesive between the side beam (21) and the casting (22), in the step for selecting the gasket (24), a gasket (24) having a predetermined gasket thickness (t) is selected on the basis of the distance of the gap (S) when the side beam (21) and the casting (22) are assembled, and the distance of the adjusted gap (W) from the gasket (24) to the casting (22) is adjusted.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a fastening method and a fastening device for a vehicle body of a vehicle. BACKGROUND

[0002] In recent years, in the manufacturing process of a vehicle, a vehicle constituent member is configured by joining a first module base and a second module base.

[0003] In Patent Literature 1, a joining method is described in which two partial modules are manufactured separately, and joining is performed with good accuracy even when there is a deviation in the angle and the front and rear position of the joining surfaces of the partial modules. PRIOR ART DOCUMENTS PATENT LITERATURE

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2019-023036 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] As the plurality of modules involved in the vehicle constituent member, a module is used in which, after a rocker is joined in a character shape, a plurality of castings are fastened by assembly bolts for the purpose of protecting a battery or the like. However, there are cases in which the gap between the rocker and the castings becomes large due to a problem in the machining accuracy of the parts, and thus stress is generated in the rocker and the castings when bolt fastening is performed. In addition, it is considered that damage occurs in these modules when the stress exceeds the allowable stress.

[0006] Further, when bolt fastening is performed, the castings are attached to the rocker after an adhesive for ensuring strength is applied to the bolt fastening surface. At this time, the gap sometimes becomes small or almost disappears due to the lower limit of the accuracy of these parts, lateral deviation, or the like, and thus the adhesive is scraped off, and the target strength cannot be ensured.

[0007] The present disclosure provides a fastening method and a fastening device that achieve an increase in the rigidity and an increase in the sealing performance of a vehicle body constituent article while reducing the number of parts. TECHNICAL MEANS FOR SOLVING THE PROBLEMS

[0008] The fastening method according to the present disclosure is a fastening method of a vehicle body structure of a vehicle body formed by combining a side sill with a casting, and includes: a step of measuring a dimension of the side sill; a step of measuring a dimension of the casting; a step of selecting a gasket to be assembled to the side sill; a step of assembling the gasket to the side sill; a step of assembling the side sill with the casting; a step of fastening the side sill with the gasket by a bolt and fastening the side sill with the casting by a bolt; and a step of injecting an adhesive between the side sill and the casting, wherein, in the step of selecting the gasket, the gasket having a prescribed gasket thickness is selected in accordance with a distance of a gap in a state where the side sill is assembled with the casting, and a distance of an adjusted gap from the gasket to the casting is adjusted. Thus, the gap of the fastening portion of the side sill and the casting can be adjusted using the gasket.

[0009] Further, the fastening device according to the present disclosure is a fastening device of a vehicle body structure of a vehicle body formed by combining a side sill with a casting, and includes: a side sill dimension measuring section that measures a dimension of the side sill; a casting dimension measuring section that measures a dimension of the casting; a gasket selecting section that selects a gasket to be assembled to the side sill; a gasket assembling section that assembles the gasket to the side sill; a side sill casting assembling section that assembles the side sill with the casting; a bolt fastening section that fastens the side sill with the gasket by a bolt and fastens the side sill with the casting by a bolt; and an adhesive injecting section that injects an adhesive between the side sill and the casting, wherein the gasket selecting section selects the gasket having a prescribed gasket thickness in accordance with a distance of a gap in a state where the side sill is assembled with the casting, and a distance of an adjusted gap from the gasket to the casting is adjusted. Thus, the gap of the fastening portion of the side sill and the casting can be adjusted using the gasket. Effects of Invention

[0010] According to the present disclosure, a fastening method and a fastening device can be provided that achieve an increase in rigidity and an increase in sealing performance of a vehicle body structure article while reducing the number of parts. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a diagram showing a configuration block and an operation flow of the fastening device according to Embodiment 1. Figure 2 is a diagram showing an object to be fastened by the related fastening device. Figure 3 is a diagram showing an object to be fastened by the fastening device according to Embodiment 1. Figure 4is a graph showing an example of the adjusted gap W adjusted to a prescribed range by setting the gasket thickness t corresponding to the initial gap S, which is related to Embodiment 1. Figure 5 is a perspective view showing an example of injection of the adhesive, which is related to Embodiment 1. Figure 6 is a graph showing details of injection of the adhesive, which is related to Embodiment 2. DETAILED DESCRIPTION

[0012] Embodiment 1 Hereinafter, a fastening device 1 of a vehicle body related to the present embodiment will be described with reference to the drawings. Figure 1 (a) of FIG. 1 shows a configuration of the fastening device 1, Figure 1 (b) of FIG. 1 is a graph showing an example of a flow of an operation of the fastening device 1.

[0013] As shown in Figure 1 , the fastening device 1 is provided with a side sill dimension measuring section 11, a casting dimension measuring section 12, a gasket selecting section 13, a gasket assembling section 14, a side sill casting assembling section 15, a bolt fastening section 16, and an adhesive injecting section 17. Further, fastening objects are described as a side sill 21, a first casting (Fr casting) 22, a second casting (Rr casting) 23, and a gasket 24.

[0014] Further, hereinafter, as shown in Figure 2 (a), with respect to the side sill 21, in a case where a viewpoint from a prescribed direction is observed, a direction in which opposite two sides of one side extend is set as an X direction, and a direction in which opposite two sides of the other side extend is set as a Y direction, the X direction and the Y direction are orthogonal to each other. Further, a direction orthogonal to the X direction and the Y direction, respectively, is sometimes set as a Z direction, and the Z direction is described as an up-down direction.

[0015] The side sill dimension measuring section 11 measures a dimension of the side sill 21. Here, as shown in Figure 2 (a) to (c) of FIG. 2 and Figure 3 (a) of FIG. 3, Figure 3 (c) of FIG. 3, the side sill 21 is a configuration article configured in a mouth shape. Further, Figure 2 shows a configuration article of a related vehicle assembled without using the gasket 24, Figure 3 shows a configuration article related to the present disclosure assembled with the gasket 24. Further, the side sill dimension measuring section 11 measures a side sill dimension Wr.

[0016] The casting dimension measuring section 12 measures dimensions of the Fr casting 22 and the Rr casting 23. Here, Figure 2 (b) of FIG. 4 and Figure 3(a) is a perspective view showing a state in which the Fr cast 22 and the Rr cast 23 are mounted with respect to the side beam 21. Further, the cast size measuring section 12 measures the cast size Wc. Here, in particular, it is provided that the Fr cast 22 and the Rr cast 23 are mounted to the side beam 21 in this order, and the size of the cast to be mounted to the side beam 21 is set as the cast size Wc. In addition, hereinafter, sometimes the explanation is provided assuming that the Fr cast 22 is mounted for the sake of simplicity, but the same applies to the Rr cast 23.

[0017] Further, Figure 2 (b) of FIG. 8 is an example of a state in which the gasket 24 is not interposed between the side beam 21 and the Fr cast 22, and between the side beam 21 and the Rr cast 23, Figure 3 (a) of FIG. 8 shows a state in which the gasket 24 is interposed between the side beam 21 and the Fr cast 22, and between the side beam 21 and the Rr cast 23.

[0018] The gasket selecting section 13 calculates the initial gap S, which is a gap between the side beam 21 and the Fr cast 22 before adjustment, and the adjusted gap W, based on the side beam size Wr measured by the side beam size measuring section 11 and the cast size Wc measured by the cast size measuring section 12, and thereby selects the gasket 24 having the optimum gasket thickness t.

[0019] Further, in the configuration of (b) of FIG. 8, Figure 2 In the configuration of (b) of FIG. 8, the side beam size Wr is the width of the side beam 21 in the Y direction at the position where the cast 22 is mounted, and the cast size Wc is the width of the cast 22 in the Y direction at the position where the side beam 21 is mounted. Further, Figure 2 (c) of FIG. 8 is an enlarged view of the vicinity of the end portion in the Y direction of the side beam 21 and the cast 22 assembled.

[0020] Here, the fastening device 1 calculates the initial gap S by Wr - Wc. In addition, the fastening device 1 calculates the adjusted gap W by W = (Wr - Wc) - t. In other words, the adjusted gap W = the initial gap S - the gasket thickness t.

[0021] Here, Figure 3 (c) of FIG. 8 is a plan view showing an example of the initial gap S and the adjusted gap W of the Fr cast 22 mounted to the side beam 21. That is, Figure 3 (c) of FIG. 8 is an enlarged view of the vicinity of the end portion in the Y direction when the side beam 21 and the cast 22 are mounted as shown in (a) of FIG. 8. Figure 3

[0022] As shown in (a) of FIG. 8 and Figure 4 Figure 4 ​​As shown in (b), the gasket selection section 13 selects the gasket 24 of the prescribed gasket thickness t in such a manner that the adjusted gap W becomes C < W < A, B in relation to the upper limit A set in accordance with the stress applied to the flange 21 and the casting 22, the upper limit B set in accordance with the allowable value of the outflow of the adhesive, and the lower limit C set in accordance with the air discharge condition at the time of the injection of the adhesive. As for Figure 4 (a) of Figure 4 (b) is described later.

[0023] Further, Figure 3 (b) is an example of the selected gasket 24, and has a flat surface 24a, a bolt insertion section 24b capable of fixing the flange 21 and the gasket 24 by inserting a bolt into the flat surface 24a, and a hole-shaped injection hole 24c capable of injecting the adhesive.

[0024] The gasket assembly section 14 is, for example, an assembly section that moves the gasket 24 to the mounting position in the flange 21. Further, the gasket 24 can be mounted to the casting 22 instead of the flange 21, in which case the gasket assembly section 14 moves the gasket 24 to the mounting position in the casting 22. Hereinafter, the description is given on the assumption that the gasket 24 is mounted to the flange 21.

[0025] The flange casting assembly section 15 is, for example, an assembly section that moves the flange 21 and the casting 22 in such a manner as to become an assembly position.

[0026] The bolt fastening section 16 is a fastening section that fastens the flange 21 and the gasket 24 with a bolt. In addition, the bolt fastening section 16 fastens the flange 21 and the casting 22 with a bolt.

[0027] The adhesive injection section 17 is a filling device that injects the adhesive into the gap adjusted by the gasket 24 in the fastening section of the flange 21 and the casting 22.

[0028] Hereinafter, the operation of the fastening device 1 is described with reference to (b) of Figure 1 .

[0029] The flange dimension measurement section 11 performs the dimension measurement of the flange 21 (step S1). Next, the casting dimension measurement section 12 performs the dimension measurement of the casting 22 (step S2).

[0030] Next, the gasket selection section 13 performs the selection of the gasket thickness with respect to the gasket 24 used (step S3).

[0031] Here, Figure 4(a) is a graph showing the size of the initial gap S, the state of the spacers 24 using the spacer thickness of the spacers 24 that fit the initial gap S, and the adjusted gap W calculated by using the spacers 24. Here, one of the spacers 24 is selected from a plurality of spacers 24 having five different spacer thicknesses.

[0032] Further, Figure 4 (b) is an enlarged view of the adjusted gap W, showing the state in which the upper limit A, the upper limit B, and the lower limit C are set as two upper limits. Here, the upper limit A refers to the length of the gap in which the stress generated in the stringer 21 and the casting 22 at the time of bolt fastening becomes below the allowable value. The upper limit B refers to the length of the gap in which the outflow of the adhesive from between the stringer 21 and the casting 22 at the time of injection of the adhesive becomes below the allowable value. The lower limit C refers to the length of the gap in which the air is smoothly discharged from between the stringer 21 and the casting 22 at the time of injection of the adhesive.

[0033] Further, in Figure 4 (b), the upper limit A is a value greater than the upper limit B, but the upper limit B can also be a value greater than the upper limit A. Typically, the smaller one of the upper limit A and the upper limit B is used.

[0034] In this way, the spacer selection section 13 selects the spacers 24 having appropriate spacer thicknesses from among the plurality of spacers in such a way that the adjusted gap W is greater than the lower limit C and smaller than the upper limits A and B. Further, as described above, the adjusted gap W is a value calculated by adjusted gap W = initial gap S - spacer thickness t.

[0035] In summary, the spacer selection section 13 is able to select the spacers 24 having the spacer thickness t in such a way that the adjusted gap W becomes a distance that ensures the amount of the adhesive injected after the fastening of the bolt. Specifically, with respect to the length of the adjusted gap W, the spacer selection section 13 is able to limit the lower limit C in such a way that it becomes a gap in which the air is smoothly discharged between the stringer 21 and the casting 22, and set the upper limit B in such a way that the outflow of the adhesive at the time of injection of the adhesive is limited to below a prescribed allowable value. In addition, the spacer selection section 13 is able to set the upper limit A in accordance with the stress applied to the stringer 21 and the casting 22. Further, in the spacer selection section 13, the spacers 24 are selected using the spacer thickness t in such a way that the adjusted gap W becomes a condition that satisfies these limits A to C.

[0036] Next, the spacer assembly section 14 assembles the stringer 21 and the selected spacers 24 (step S4). Next, the stringer casting assembly section 15 assembles the stringer 21 and the casting 22 (step S5). Next, the bolt fastening section 16 performs the fastening of the spacers 24 to the stringer 21 using bolts, and the fastening of the stringer 21 to the casting 22 using bolts (step S6).

[0037] Next, the adhesive injection portion 17 injects adhesive into the gap adjusted by the gasket 24 in the fastening portion of the border beam 21 and the casting 22 (step S7).

[0038] Here, as shown in (b) of FIG. 10, the gasket 24 is provided with an injection hole 24c, and the area of the injection hole 24c on the surface of the gasket 24 is set to an area V. The injection amount of the adhesive is set to a target filling amount = V x S using this area V and the initial gap S. Figure 3

[0039] Figure 5 (a) to (d) of FIG. 11 are diagrams showing examples of the state in which the adhesive is injected into the injection hole 24c. Figure 5 (a) of FIG. 11 is a state at the start of injection, Figure 5 (b) of FIG. 11 is a state at the early stage of injection, Figure 5 (c) of FIG. 11 is a state at the late stage of injection, and Figure 5 (d) of FIG. 11 shows a state at the completion of injection. Figure 5

[0040] Here, as shown by arrows in (b) of FIG. 12, between the border beam 21 and the casting 22, the state in which air is discharged from the small gap from a portion other than the bolt insertion portion 24b by continuously injecting the adhesive from the adhesive injection portion 17 into the injection hole 24c. On the other hand, as shown by arrows in (d) of FIG. 12, when the amount of the adhesive injected from the adhesive injection portion 17 into the injection hole 24c increases, the adhesive itself flows out from the small gap. Thus, in the fastening device 1, with respect to the adhesive, the injection is performed with an appropriate filling amount using V x S as the target filling amount and the allowable value Q of the flow-out, and the like. Figure 5 Figure 5

[0041] Specifically, Figure 6 is a diagram showing an example of the configuration of the adhesive injection portion 17 and the conditions at the time of injecting the adhesive. Specifically, Figure 6 (a) of FIG. 13 shows an example of the configuration of the adhesive injection portion 17, Figure 6 (b) of FIG. 13 shows an enlarged view of the vicinity of the gasket 24 and the injection hole 24c. Figure 6 In (c) of FIG. 13, the horizontal axis is set to the injection amount or the time of the adhesive, and the vertical axis is set to the size of the power of the driving motor 31 described later, the pressure applied to the adhesive in the injection cylinder 32.

[0042] Here, as shown in (b) of FIG. 14, the gasket 24 is provided with an injection hole 24c, and the area of the injection hole 24c on the surface of the gasket 24 is set to an area V. The injection amount of the adhesive is set to a target filling amount = V x S using this area V and the initial gap S. Figure 6 ​​​​As shown in (a), the adhesive injection unit 17 includes a drive motor 31, an injection cylinder 32, an injection nozzle 33, and a pressure gauge 34. The injection cylinder 32 is operated by the driving force received from the drive motor 31 to inject the adhesive filled inside it into the injection hole 24c of the gasket 24 disposed in the fastening part between the side beam 21 and the casting 22 through the injection nozzle 33. In addition, the pressure gauge 34 can measure the pressure of the adhesive applied to the adhesive in the injection cylinder 32 or the injection nozzle 33.

[0043] like Figure 6 As shown in (b), the distance between the face of the shim 24 on the casting 22 side and the casting 22 is the adjusted clearance W. Here, as Figure 6 As shown in (c), when the adjusted gap W is too small (gap 4), the air expulsion caused by the injected adhesive is poor, the pressure rises before filling, and the target filling amount of adhesive cannot be injected. In this case, by setting appropriately... Figure 4 The lower limit C in (b) is set so that the adjusted gap W exceeds the lower limit C, which enables the gap between the side beam 21 and the casting 22 to become a gap for smooth air discharge.

[0044] Additionally, if the adjusted gap W is too large ( Figure 6 In gap (c), after injection, a significant amount of adhesive will flow out from the gap, resulting in a situation where the pressure cannot rise above the specified threshold P, which is undesirable. In this case, by appropriately setting... Figure 4 The upper limit B in (b) and the adjusted gap W not exceeding the upper limit B are such that the gap between the side beam 21 and the casting 22 becomes a gap where the outflow of adhesive is below the allowable value.

[0045] Therefore, in the adhesive injection section 17, when the adjusted gap W is appropriately set ( Figure 6 (c) gaps 2 and 3) are capable of completing injection while suppressing the outflow of adhesive from the gaps within the allowable value Q, and while the pressure applied to the adhesive exceeds the specified threshold P.

[0046] In addition, Figure 6 In (a), it is described that the adhesive injection section 17 is provided on the side beam 21, and the nozzle 33 is configured to pass through the nozzle insertion hole provided on the side beam 21, but it is not limited to this. That is, it is also possible to configure the adhesive injection section 17 to be provided on the side of the casting 22.

[0047] According to the above, in the fastening device 1, the gasket 24 having a suitable gasket thickness t can be disposed between the side sill 21 and the casting 22. In other words, in the fastening device 1, the use of the gasket 24 having a prescribed gasket thickness t is determined in accordance with the length of the gap S generated between the side sill 21 and the casting 22 without the gasket 24 being interposed. Thus, the fastening device 1 can adjust the distance of the gasket 24 mounted to the side sill 21 from the casting 22, and the adjusted adjusted gap W becomes a gap that ensures the amount of injected adhesive.

[0048] Therefore, in the fastening device 1, in the case where the injection hole 24c provided in the gasket 24 between the side sill 21 and the casting 22 is injected with adhesive, the amount of outflow of the adhesive from the gap between the gasket 24 and the casting 22 can be suppressed, and an adequate amount of adhesive can be injected so that the adhesion of the side sill 21 and the casting 22 is sufficiently strong.

[0049] Thus, the improvement of the rigidity and the improvement of the sealing property of the vehicle body constituent article of the vehicle can be achieved while reducing the number of parts.

[0050] Further, the present application is not limited to the above-described embodiments, and can be appropriately changed within the scope of the gist. That is, the above-described description has been appropriately omitted and simplified for the sake of clarity of the explanation, and each element of the embodiments can be easily changed, added, and transformed within the scope of the present application for those skilled in the art.

[0051] For example, the gasket 24 can not be mounted to the side sill 21 as described above, but can be mounted to the casting 22. That is, as the fastening method, the following steps can be provided: a step of selecting the gasket 24 to be assembled to the casting 22; a step of assembling the gasket 24 to the casting 22; a step of assembling the side sill 21 and the casting 22; a step of fastening the casting 22 and the gasket 24 with a bolt, and fastening the side sill 21 and the casting 22 with a bolt; and a step of injecting adhesive between the side sill 21 and the casting 22, the gasket 24 having a gasket thickness t is selected in accordance with the distance of the initial gap S in the case where the side sill 21 and the casting 22 are assembled, and the distance of the adjusted gap W from the gasket 24 to the side sill 21 is adjusted. Explanation of Reference Numerals

[0052] 1 fastening device 11 side sill dimension measuring portion 12 casting dimension measuring portion 13 gasket selecting portion 14 gasket assembling portion 15 side sill-casting assembling portion 16 bolt fastening portion 17 adhesive injecting portion 21 side sill 22 first cast (Fr cast) 23 second cast (Rr cast) 24 shim 24a flat surface 24b bolt insertion portion 24c injection hole 31 drive motor 32 injection cylinder 33 nozzle 34 pressure gauge Q allowable value S initial gap V area W adjusted gap Wc cast size Wr sill size t shim thickness

Claims

1. A fastening method of a vehicle body structure of a vehicle body formed by combining a side sill with a casting, comprising: a step of measuring a dimension of the side sill; a step of measuring a dimension of the casting; a step of selecting a gasket to be assembled to the side sill; a step of assembling the gasket to the side sill; a step of assembling the side sill with the casting; a step of fastening the side sill with the gasket by a bolt and fastening the side sill with the casting by a bolt; and a step of injecting an adhesive between the side sill and the casting, wherein in the step of selecting the gasket, the gasket having a prescribed gasket thickness is selected in accordance with a distance of a gap in a case where the side sill is assembled with the casting, and a distance of an adjusted gap from the gasket to the casting is adjusted.

2. The fastening method according to claim 1, wherein, as an alternative to the gasket being assembled to the side sill, the gasket is assembled to the casting, and comprising: a step of selecting a gasket to be assembled to the casting; a step of assembling the gasket to the casting; a step of assembling the side sill with the casting; a step of fastening the casting with the gasket by a bolt and fastening the side sill with the casting by a bolt; and a step of injecting an adhesive between the side sill and the casting, wherein the gasket having a prescribed gasket thickness is selected in accordance with a distance of a gap in a case where the side sill is assembled with the casting, and a distance of an adjusted gap from the gasket to the side sill is adjusted.

3. The fastening method according to claim 2, wherein, in the step of selecting the gasket, the gasket having a gasket thickness that makes the adjusted gap a distance that ensures an amount of the injected adhesive after fastening of the bolt is selected.

4. The fastening method according to claim 3, wherein, in the step of selecting the gasket, the gasket having a gasket thickness that satisfies both a lower limit of a length of the adjusted gap that limits an air gap between the side sill and the casting to be smooth and an upper limit of the length of the adjusted gap that limits an outflow of the adhesive at the time of injection of the adhesive to be below a prescribed allowable value is selected.

5. A fastening device of a vehicle body structure of a vehicle body formed by combining a side sill with a casting, comprising: a side sill dimension measuring section that measures a dimension of the side sill; a casting dimension measuring section that measures a dimension of the casting; a gasket selecting section that selects a gasket to be assembled to the side sill; a gasket assembling section that assembles the gasket to the side sill; a side sill casting assembling section that assembles the side sill with the casting; a bolt fastening section that fastens the side sill with the gasket by a bolt and fastens the side sill with the casting by a bolt; and an adhesive injecting section that injects an adhesive between the side sill and the casting, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The gasket selection section selects the gasket having a prescribed gasket thickness in accordance with the distance of the gap in the case where the side beam is assembled with the casting, and adjusts the distance of the adjusted gap from the gasket to the casting.

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