JP2941925B2 - Work assembly method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for assembling a work.

(Prior Art) As shown in JP-A-1-208285, a work assembling method involves individually positioning a work and an attached body with respect to a jig by using positioning pins provided upright on the jig. And then assembling the work to the body to be mounted.

Specifically, in this assembling method, a jig is provided with a positioning pin for a work and a positioning pin for a workpiece, and each positioning pin is inserted into a positioning hole provided in the workpiece and the workpiece. Thereby, the workpiece and the attached body are respectively positioned based on the jig, and as a result,
The positional relationship between the workpiece and the workpiece is determined.

(Problems to be Solved by the Invention) However, in the above assembling method, positioning pins for the workpiece and the workpiece must be provided on the jig in order to determine the positional relationship between the workpiece and the workpiece. Must
The number of parts (positioning pins) must be large.

Moreover, the positioning of the workpiece and the attached body is obtained as a result of positioning the workpiece and the attached body on the jig with reference to each positioning pin of the jig, respectively.
The positional relationship between the workpiece and the attached body is determined not indirectly but directly indirectly. For this reason, when the positioning accuracy of the positioning pins of the jig, the work, and the positioning holes of the work to be mounted is not high, the positioning of the work to be mounted and the work is properly performed as a result of the sum of the errors. There is a risk that the state will deviate.

The present invention has been made in view of the above circumstances, and an object of the present invention is to individually perform positioning of a work and an attached body with respect to a jig by using a positioning pin erected on the jig, and thereafter, In a method of assembling a work for assembling the work to an attached body, it is an object of the present invention to reduce the number of positioning pins of a jig and to improve the positioning accuracy between the attached body and the work in assembling.

(Means and Actions for Solving the Problems) In order to achieve the above object, in the present invention, the positioning of the work and the attached body with respect to the jig is performed by using a positioning pin provided upright on the jig. In the method of assembling a work for assembling the work to the attached body, a large-diameter hole is provided in the work, and the attached body has a smaller diameter than the large-diameter hole. A large-diameter portion that can be inserted into the large-diameter hole, and the same axis as the axis of the large-diameter portion at a position on the distal end side of the large-diameter portion. And a small-diameter portion formed so as to be able to be inserted into the small-diameter hole. When positioning the jig and the work, the jig and the attached body, first, the large diameter of the positioning pin Part through the large-diameter hole of the workpiece, There diameter portion of the serial positioning pins configured so as to inserted into the small-diameter hole of the object to be attached body.

With the above-described configuration, the same positioning pin is used when positioning the jig and the work, and between the jig and the attached body, so that the positioning pin can be shared. Thereby, the number of positioning pins of the jig can be reduced.

In addition, since each of the above-described positioning is performed based on the large-diameter portion and the small-diameter portion under the same positioning pin, the workpiece and the workpiece are directly positioned. Moreover, when positioning the workpiece and the workpiece, the step formed by the small diameter part and the large diameter part is brought into contact with the workpiece,
Even if the load on the jig is unevenly distributed, the jig can be maintained in an appropriate posture with respect to the attached body, and the work can be brought close to the attached body by using the large-diameter portion as a guide. For this reason, the positioning accuracy between the workpiece and the workpiece can be improved.

(Embodiment) Hereinafter, an embodiment of the present invention will be described by taking as an example a case where a sunroof unit is assembled as a workpiece to a vehicle body as an attached body.

First, as shown in FIG. 1, the vehicle body 1 is transferred to the sunroof unit assembling station S by tact transfer by the transfer device 2.

In the sunroof unit assembling station S, a turntable 3 is provided beside the transfer device 2. The turntable 3 is divided into four work areas, and in each work area on the turntable 3, predetermined work is performed.

That is, in the work area, the empty jig 4 is moved from the work area, and the sunroof unit before the parts are assembled is set on the jig 4. Then, predetermined parts are assembled to the sunroof unit before the parts are assembled from the work area to the work area, and the sunroof unit after the assembly is completed (hereinafter, referred to as a sunroof unit).
The jig 4 on which 5 is set is moved to the work area.

Here, the jig 4 and the setting of the sunroof unit 5 with respect to the jig 4 will be described briefly. The jig 4 is shown in FIG. 2 (FIG. 2 shows one side of the jig with the dashed line as the center). ), A long first support frame 6 is provided, and a grip 7 is provided on one end side (left end side in FIG. 2) of the first support frame 6, and the first support frame 6 is provided with a first support frame 6. On the other end side (the right end side in FIG. 2) of the support frame 6, a second support frame 8 is fixed so as to cross the first support frame. On the second support frame 8, a third mechanism is provided via a floating mechanism 9.
A support frame 10 is provided, and the third support frame 10 is moved by the floating mechanism 9 in a floating state in which the third support frame 10 can freely move in the horizontal direction with respect to the second support frame 8. The locked state to be fixed can be appropriately selected. The third support frame 10 includes a connecting portion 11 that extends across the first support frame 6 from the second support frame 8,
11 has support portions (one of a pair of support portions 12 is not shown) provided at both end portions and extending in the direction in which the first support frame 6 extends. On each support portion 12, a positioning pin 13, a pair of socket devices 14 for tightening nuts, and a pair of suction pads
Each of the connecting portions 11 is provided with a lifter (elevating cylinder) 31 on both sides of the first supporting frame 6 with reference to the first supporting frame 6 (one of which is not shown). A receiving member 16 is provided above.

As shown in FIG. 3, each of the positioning pins 13 (the positioning pins on one of the support portions, which are not shown) are, as shown in FIG.
Large-diameter part that is erected with a relatively long length on the support part 12
17 and a small-diameter portion 18 extending upward with a length considerably shorter than the large-diameter portion 17.
A step 19 is formed between the two. The large-diameter portion 17 has a function as a positioning pin for the sunroof unit 5, and the large-diameter portion 17 can be inserted into positioning holes 20 (see FIG. 5) on both sides of the sunroof unit 5. Outer diameter. The small diameter portion 18 has a function as a positioning pin for the vehicle body 1, and the small diameter portion 18
Positioning holes 21 on both sides of body 1 (see FIG. 5)
Has an outer diameter that allows insertion. The axis of the small-diameter portion 18 coincides with the axis of the large-diameter portion 17, and the positioning pin 13 having the small-diameter portion 18 and the large-diameter portion 17 passes through (the positioning hole 20 of) the sunroof unit 5. A fixed positional relationship between the vehicle body 1 (the positioning hole 21 thereof) is directly determined. The outer peripheral surface of the distal end portion of the small-diameter portion 18 is inclined so that the outer diameter decreases as it goes upward, and the outer peripheral surface has a function as a guide surface for the positioning hole 21 of the vehicle body 1. doing.

As shown in FIG. 4, each of the socket devices 14 has a first
It comprises a transmission shaft 22, a second transmission shaft 23, a socket 24, and a coil spring 25. The first transmission shaft 22 is rotatably supported by the support portion 12 so as to extend in the vertical direction. The upper end of the first transmission shaft 22 is positioned at the same height as the upper surface of the support portion 12, and the lower end portion of the support portion 12 is It extends downward. Second
The transmission shaft 23 is disposed to extend vertically above the first transmission shaft 22, and its lower end is spline-coupled to the upper end of the first transmission shaft 22 so as to be vertically displaceable. ing. The socket 24 is fixed to the upper end of the second transmission shaft 23, and a fixing nut is provided in the socket 24.
26 is inserted. Coil spring 25 is a socket
The socket 24 is fitted around the outer periphery of the second transmission shaft 23 between the upper end of the first transmission shaft 22 and the upper end of the first transmission shaft 22, and the coil spring 25 urges the socket 24 upward.

Floating mechanism 9, suction pad 15, lifter 31
Is already known, and the description thereof is omitted.

The sunroof unit 5 is set on the jig 4 by placing the sunroof unit 5 on the jig 4.
Receiving member 16 on 11, a pair of sockets 24 on both supports 12,
It is received by a pair of suction pads 15, and at that time, in order to position the sunroof unit 5 with respect to the jig 4,
As shown by the solid line in FIG. 5, the large diameter portions 17 of the positioning pins 13 on both support portions 12 are inserted into the positioning holes 20 on both sides of the sunroof unit 5 respectively. still,
In FIG. 2, the sunroof unit 5 is indicated by an alternate long and short dash line.

Let us return to the procedure for assembling the sunroof unit 5 again. When the jig 4 on which the sunroof unit 5 is set is moved to a work area, the robot 27
The gripper 7 of the jig 4 is gripped by a robot hand (not shown) attached to the tip of the arm 27a of the arm 27a, and as shown in FIG. From the vehicle body 1 through the front window frame. Then, the robot 27 lifts and raises the jig 4, and the distal ends of the positioning pins 13 on the jig 4 are
In the state of being engaged with the positioning hole 21, the ascent is stopped.

Subsequently, the third support frame 10 is brought into a floating state with respect to the second support frame 8, and the robot 27 raises the jig 4 again in this state. Thereby, even if the position of each positioning hole 21 of the vehicle body 1 is displaced from the position of each positioning pin 13, each positioning pin 13 is guided by the outer peripheral surface at the distal end of the small diameter portion 18 and enters into each positioning hole 21. It will be inserted. Then, as shown by the imaginary line in FIG.
When the inner peripheral edge of each positioning hole 21 of the vehicle body 1 comes into contact with the step 19 of each positioning pin 13, the robot 27 stops lifting the jig 4. At this time, as shown by a virtual line in FIG.
Each mounting hole 5a of the sunroof unit 5 is located slightly below the mounting bolt 28 provided in each mounting portion 1a.

Next, the lifter 31 is operated, and the sunroof unit 5 is raised until the sunroof unit 5 comes into contact with the vehicle body 1 (the mounting portion 1a) as shown by the arrow in FIG. When the sunroof unit 5 is raised, the large-diameter portions 17 of the positioning pins 13 are inserted into the positioning holes 20 of the sunroof unit 5 so that the large-diameter portions 17 function as a guide. Thus, the sunroof unit 5 is raised while maintaining the positional relationship between the vehicle body and the sunroof unit determined by the large-diameter portion 17 and the small-diameter portion 18 of the positioning pins 13. As a result, the vehicle body 1 and the sunroof unit 5 are directly positioned through the two positioning pins 13.

As described above, the step 19 of the positioning pin 13 is brought into contact with the inner peripheral edge of the positioning hole 21 of the vehicle body 1 so that only the small diameter portion 18 is inserted into the positioning hole 21 of the vehicle body 1 and the jig 4 is moved to the large diameter portion.
The reason why the jig 4 and the sunroof unit 5 are lifted by the lifter 31 while being guided by the guide 17 is that the weight of each part is unevenly distributed. It is difficult to accurately maintain the jig 4 in a horizontal state within the jig 1, and as the jig 4 is raised, the positioning pin 13 may be raised in an inclined state. This is because there is a possibility that the positioning with the hood unit 5 is not performed smoothly.

When the sunroof unit 5 is raised until the sunroof unit 5 comes into contact with each mounting portion 1a of the vehicle body 1 as shown by a virtual line in FIG.
The mounting bolts 28 of the vehicle body 1 are inserted into the mounting holes 5a of the sunroof unit 5, respectively. At this time, each socket 24
Rises as the sunroof unit 5 rises due to the urging force of the coil spring 25. The mounting bolts 28 are inserted into the mounting holes 5a of the sunroof unit 5, and the tips of the mounting bolts 28 When it comes into contact with the socket 24 (the nut 26 in the socket 24), its rise is stopped.

When the sunroof unit 5 comes into contact with each mounting portion 1a of the vehicle body 1 and each mounting bolt 28 of the vehicle body 1 is inserted into each mounting hole 5a of the sunroof unit 5, a plurality of robots 29 holding the nut runner are The nut runner is fitted to the lower end of the first transmission shaft 22 from below. Then, rotate the nut runner, and attach the nut 26 in the socket 24 to the mounting bolt 28.
Tighten to At this time, each of the sockets 24 is raised by the coil spring 25 with the tightening of the nut, and each of the nuts 26 is tightened to each of the mounting bolts 28 until a predetermined state is reached. Thereby, the sunroof unit 5 is fixed to the vehicle body 1.

After tightening the nut, the robot 29 (arm) holding the nut runner returns to its original position,
The jig 4 is lowered, and each positioning pin 13 on the jig 4 is pulled out from each positioning hole 20 of the sunroof unit 5, and the empty jig 4 is returned to the work area on the turntable 3.
Empty jig 4 in the work area on the turntable 3
Is moved to the work area on the turntable 3 and again,
The same work is repeated.

Therefore, in this embodiment, when the sunroof unit 5 is set on the jig 4, the positioning pins 13 (large-diameter portions 17) are used for positioning the sunroof unit 5 with respect to the jig 4, and the vehicle body with respect to the jig 4 is Since the same positioning pin 13 (small-diameter portion 18) is used for the positioning, the positioning pin 13 can be shared and the number of positioning pins 13 can be reduced.

Further, the sunroof unit 5 and the vehicle body 1 are positioned with respect to the jig 4 through the positioning pins 13. Since the same positioning pin 13 is used, the sunroof unit 5 and the vehicle body 1 Therefore, the positioning is performed directly, not indirectly, and the positioning accuracy is improved.

(Effects of the Invention) As described above, in the present invention, the positioning of the workpiece and the attached body with respect to the jig is individually performed using the positioning pins erected on the jig, and thereafter, the attached body is attached. On the other hand, in the work assembling method for assembling the work, the number of positioning pins of the jig can be reduced, and at the time of assembling, the positioning accuracy between the workpiece and the work can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an assembling line including a sunroof unit assembling station, FIG. 2 is a plan view showing a jig used in an embodiment of the present invention, and FIG. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 2, FIG. 5 is an explanatory view illustrating positioning by the positioning pins, and FIG. 6 is an explanatory view of attaching the sunroof unit to the vehicle body. FIG. 1 ... body 4 ... jig 5 ... sunroof unit 13 ... positioning pin

Continuation of the front page (56) References JP-A-2-106229 (JP, A) JP-A-1-208285 (JP, A) JP-A-60-1003081 (JP, U) JP-A-60-146439 (JP (U, U) Real opening 63-43992 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23P 19/00 302 B23P 19/06 B23P 21/00 303 B25B 23/14 640

Claims (1)

(57) [Claims] A work and an object to be mounted are individually positioned with respect to a jig using positioning pins erected on the jig, and thereafter, the work for assembling the work to the object to be mounted is provided. In the assembling method, a large-diameter hole is provided in the workpiece, and a small-diameter hole having a smaller diameter than the large-diameter hole is provided in the attached body, while the positioning pin is provided in the large-diameter hole. A large-diameter portion that can be inserted, and a small-diameter portion that is formed so as to have the same axis as the axis of the large-diameter portion at a position on the distal end side of the large-diameter portion and that can be inserted into the small-diameter hole are provided. In positioning each of the jig and the work, and the jig and the attached body, first, a large-diameter portion of the positioning pin is inserted into a large-diameter hole of the work, and then a small-diameter portion of the positioning pin. Through a small diameter hole of the attached body, How to assemble the workpiece.