JP4100314B2 - Work positioning apparatus and work positioning method - Google Patents

Description

  The present invention relates to a workpiece positioning device and a workpiece positioning method for positioning and fixing a workpiece.

As a workpiece positioning device, for example, Patent Document 1 described below describes a device for positioning and fixing a vehicle body panel component of an automobile.
JP 2001-151175 A

  By the way, body panel parts such as side panels that constitute the side surface of a vehicle body in an automobile are configured by joining an inner panel and an outer panel by welding, and it is necessary to position and fix each panel at a working position during this welding operation. is there.

  In this case, normally, in addition to the positioning pin inserted into the positioning hole provided in the workpiece, the workpiece is clamped and fixed by a gauge portion formed in a panel shape for receiving the workpiece and a clamp arm driven by an air cylinder or the like. A clamping mechanism is provided separately.

  However, in the workpiece positioning device that is additionally provided with a clamping mechanism in addition to the positioning pin as described above, a clamping mechanism that requires a large space, particularly with an air cylinder, is a hindrance when processing workpieces such as welding operations. As a result, the movable range of a processing tool such as a welding gun is restricted, resulting in deterioration of workability.

  Accordingly, an object of the present invention is to enable positioning of a workpiece without causing deterioration of workability after positioning.

In order to achieve the above object, the present invention inserts and fixes the vehicle body panel (1) into a screw hole (5a) of a door mounting nut (5) fixed in advance to the vehicle body panel (1). ) Is positioned at the work position, and is provided with a screw part (9c) that is fastened to the nut (5) .

According to the invention, the threaded portion of the positioning pin, by fixing by fastening the screw hole of the nut of the door mounting that is previously fixed to the vehicle body panel, since the vehicle body panel for positioning and fixing in the working position, As a positioning device, in addition to the positioning pin, a separate clamping mechanism is not required, and the work on the workpiece in a fixed state is facilitated.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a sectional view of a work positioning apparatus showing a first embodiment of the present invention, and FIG. 2 is a perspective view showing the whole.

  The work W here is an inner panel 1 and an outer panel 3 constituting a side panel which is a vehicle body panel part for an automobile, and the work W is positioned and fixed when these two are fixed by welding. On the upper surface of the inner panel 1 opposite to the outer panel 3, a door mounting nut 5 for mounting a door (not shown) is fixed in advance by welding, and the inner panel corresponds to the screw hole 5a of the nut 5. 1 has a positioning hole 1a, and the outer panel 3 has a through hole 3a.

  The inner diameter of the positioning hole 1 a of the inner panel 1 is larger than the inner diameter of the screw hole 5 a of the nut 5, and the inner diameter of the through hole 3 a of the outer panel 3 is larger than the inner diameter of the positioning hole 1 a of the inner panel 1.

  In the positioning device described above, the positioning pin 9 protrudes from the distal end surface 7 a of the guide housing 7. The positioning pin 9 is provided with a conical guide portion 9a that becomes narrower toward the distal end side at the distal end portion, and further includes a pin portion 9b and a screw portion 9c that is fastened to the nut 5 on the base side from the guide portion 9a. ing. On the further base side of the screw portion 9c, there is provided a positioning portion 9d that has a diameter substantially the same as or slightly larger than the positioning hole 1a of the inner panel 1 and fits into the positioning hole 1a.

  Further, the front end surface 7a of the guide housing 7 is a flat work receiving surface on which the outer panel 3 is placed.

  FIG. 3 is a cross-sectional view of the positioning device described above. The guide housing 7 includes a guide shaft portion 11 positioned at the upper portion and a housing main body portion 13 positioned at the lower portion of the guide shaft portion 11. It is fixed on the base part 14. A guide hole 11a is formed in the guide shaft portion 11, and the base side including the positioning portion 9d of the positioning pin 9 is movably inserted into the guide hole 11a.

  The lower end of the positioning pin 9 in the guide hole 11a is connected via the connecting pin 17 to the upper end of the movable shaft 15 accommodated in the guide hole 11a so as to be vertically movable and rotatable. A guide bush 19 is interposed between the movable shaft 15 and the guide hole 11 a, and the movable shaft 15 slides relative to the guide bush 19.

  The lower end of the movable shaft 15 protrudes into the housing body 13 described above, and a servo motor 21 that rotates the movable shaft 15 together with the positioning pin 9 is connected to the protruding end. The servo motor 21 is movable along a guide rail 23 that is arranged extending in the vertical direction in the housing main body 13. Further, a male screw portion 15 a is formed in a portion of the movable shaft 15 protruding into the housing main body portion 13, and a guide nut 25 that is screwed into the male screw portion 15 a is fixed in the housing main body portion 13.

  That is, when the movable shaft 15 is rotated by the drive of the servo motor 21 described above, the male screw portion 15a is rotated with respect to the guide nut 25 fixed to the housing main body portion 13, so that the servo motor 21 is moved to the guide rail 23. Along with this, the movable shaft 15 and the positioning pin 9 are integrally moved up and down with respect to the guide housing 7.

  4 is a plan view showing a state in which the workpiece W is positioned and fixed. The positioning portions F1 and F2 in the lower portion of the front pillar 27 and the positioning portions S1 and S2 in the lower portion of the center pillar 29 are enlarged in FIG. As shown, two door mounting nuts 5 shown in FIG. 1 are fixed. Using one of these two nuts 5, the workpiece W is positioned and fixed using the positioning device of the present embodiment described above.

  For the appropriate positions other than the above-described positioning parts F1, F2 and S1, S2 in the work W, a conventionally used gauge part for placing the work and a clamp arm driven by an air cylinder or the like The workpiece W is positioned and fixed by the clamp mechanism 31 that clamps and fixes the workpiece.

  Further, an outer panel positioning pin 33 for positioning the outer panel 3 is provided at a position adjacent to the positioning pin 9, and an outer panel positioning hole 3 b into which the outer panel positioning pin 33 is inserted is formed in the outer panel 3. Further, corresponding to the outer panel positioning hole 3b, the inner panel 1 is formed with a through hole 1b having an inner diameter larger than that of the outer panel positioning hole 3b. The inner panel positioning pin 33 described above is omitted in FIGS.

  Next, the operation will be described. First, the outer panel 3 is positioned. In this positioning, the outer panel positioning pins 33 are inserted into the positioning holes 3b of the outer panel 3, as shown in FIG. At the same time, the positioning pin 9 is inserted into the through hole 3 a of the outer panel 3, and the outer panel 3 is placed on the distal end surface 7 a of the guide housing 7. At this time, the positioning pin 9 is set at a retracted position where the screw portion 9c is inserted into the guide housing 7.

  From the state of FIG. 6, the inner panel 1 is placed on the outer panel 3 as shown in FIG. At this time, the pin portion 9 b is inserted from the guide portion 9 a at the tip of the positioning pin 9 into the screw hole 5 a of the nut 5 through the positioning hole 1 a of the inner panel 1. At the same time, the outer panel positioning pin 33 is inserted into the through hole 1 b of the inner panel 1. From this state, the servo motor 21 shown in FIG. 3 is driven to rotate the positioning pin 9 and fasten the screw portion 9c to the nut 5 as shown in FIG.

  When the fastening operation of the screw portion 9c to the nut 5 is completed, the positioning portion 9d having a larger diameter than the screw portion 9c is fitted into the positioning hole 1a of the inner panel 1 as shown in FIG. The upper end abuts on the nut 5, thereby completing the positioning and fixing operation of the workpiece W including the inner panel 1.

  FIG. 9 is an enlarged perspective view of the positioning portions F1 and F2 in FIGS. 4 and 5. The tip of the positioning pin 9 protrudes from one nut 5 in each of the positioning portions F1 and F2. Recognize.

  In this way, the outer panel 3 is positioned by the outer panel positioning pins 33 and the inner panel 1 is positioned and fixed by the positioning pins 9, whereby the relative positions of the inner panel 1 and the outer panel 3 are also positioned. For example, a necessary part is appropriately welded and fixed using a welding robot.

  The positioning and fixing of the workpiece W described above uses the positioning pin 9 provided with the screw portion 9c, positions the inner panel 1 with the positioning portion 9d, and fixes the inner panel 1 with the screw portion 9c.

  For this reason, since it is not necessary to separately provide a clamp mechanism including a gauge part and a clamp part for fixing the workpiece W in addition to the positioning pin 9 as a positioning device, a robot arm or the like used for welding work is provided. Thus, the processing work on the workpiece W in the state of being positioned and fixed becomes easy without being disturbed by these.

  FIG. 10 is a cross-sectional view of a work positioning apparatus showing a second embodiment of the present invention. In this embodiment, a positioning pin 35 having a clamp claw 37 is used instead of the positioning pin 9 having the screw portion 9c of FIG. The positioning pin 35 movably accommodates a clamp claw 37 in a slit 35a formed therein.

  The clamp claw 37 can be moved in the slit 35a between a clamp position shown in FIG. 10 and an unclamp position entering the slit 35a from the state shown in FIG. 10 by a drive mechanism (not shown) such as an air cylinder. .

  The movement of the clamp claw 37 is configured such that a cam groove is provided on the base side of the clamp claw 37 and a cam pin (not shown) fixed on the positioning pin 35 side is inserted into the cam groove. By moving upward by a cylinder or the like, the cam pin relatively moves in the cam groove so that the clamp pawl 37 enters the slit 35a. On the contrary, the clamp pawl 37 is moved downward by an air cylinder or the like, so that the cam pin relatively moves in the cam groove, and the nut 5 is pushed downward by the pawl portion 37a at the tip, thereby the work piece. Position and fix W.

  Such a positioning pin 35 has a pin portion 35c inserted into the screw hole 5a of the nut 5 from a guide portion 35b having a tapered tip, and further below the workpiece receiving portion having a larger diameter than the pin portion 35c. 35d. The tip end surface 35e of the workpiece receiving portion 35d is a workpiece receiving surface on which the inner panel 3 is placed.

  The inner panel 1 and the outer panel 3 are provided with a positioning hole 1a and a through-hole 3a having a diameter larger than that of the positioning hole 1a corresponding to the screw hole 5a of the nut 5, respectively. The positioning hole 1 a has a slightly larger diameter than the pin portion 35 c of the positioning pin 35 and positions the inner panel 1. Although positioning of the outer panel 3 is not shown, it is performed using the outer panel positioning pins 33 shown in FIG.

  Also in this embodiment, as in the first embodiment, the outer panel 3 is first positioned in the same manner as in FIG. At this time, in the outer panel 3, the pin portion 35c of the positioning pin 35 is inserted into the through hole 3a and placed on the tip surface 35e of the workpiece receiving portion 35d. Thereafter, the inner panel 1 is placed on the outer panel 3. At this time, the pin portion 35 c is inserted into the screw hole 5 a of the nut 5 through the positioning hole 1 a. At this time, the clamp pawl 37 is set at an unclamping position that enters the slit 35 a of the positioning pin 35.

  Next, as shown in FIG. 10, the clamp claw 37 is protruded from the slit 35a to the clamp position, so that the claw portion 37a of the clamp claw 37 presses the nut 5 downward, and the tips of the claw portion 37a and the workpiece receiving portion 35d. The workpiece W is clamped and fixed between the surface 35e, and thereby the positioning and fixing operation for the workpiece W is completed.

  Therefore, in this embodiment, in addition to the positioning pin 35 having the clamp pawl 37 as the positioning device, there is no need to separately provide a clamp mechanism having a gauge portion and a clamp portion for fixing the workpiece W. The robot arm or the like used in the work is not obstructed by these, and the machining work on the work W in a fixed state is facilitated.

It is sectional drawing of the workpiece | work positioning device which shows 1st Embodiment of this invention. It is a perspective view showing the whole work positioning device by a 1st embodiment. It is sectional drawing of the workpiece | work positioning device shown in FIG. It is a top view which shows the state which fixed and fixed the workpiece | work with the workpiece | work positioning device of 1st Embodiment. It is the top view which expanded and showed the principal part of FIG. It is operation | movement explanatory drawing of the workpiece | work positioning device by 1st Embodiment which shows the state which set the outer panel. It is operation | movement explanatory drawing of the workpiece | work positioning device which shows the state which set the inner panel from the state of FIG. It is operation | movement explanatory drawing of the workpiece | work positioning device which shows the state which rotates a positioning pin from the state of FIG. It is the perspective view which expanded and showed the positioning site | part in FIG. 4, FIG. It is sectional drawing of the workpiece | work positioning device which shows 2nd Embodiment of this invention.

Explanation of symbols

W Work 1 Inner panel (body panel)
1a Positioning hole 5 Nut for door installation 5a Nut screw hole 7 Guide housing 7a, 35e Tip surface (work receiving surface)
9, 35 Positioning pin 9c Screw part 9d Positioning part 37 Clamp claw

Claims (6)

A positioning device provided with a positioning pin for positioning and fixing the vehicle body panel at a working position by inserting and fixing it in a screw hole of a door mounting nut that is fixed in advance to the vehicle body panel . A workpiece positioning device provided with a screw portion for fastening to the nut . A positioning hole corresponding to the screw hole of the nut is provided in the vehicle body panel, and a positioning portion that fits into the positioning hole in a state where the screw portion is fastened to the nut is provided in the positioning pin. The workpiece positioning apparatus according to claim 1 . Work according to claim 1 or 2, characterized in that the front end surface of the guide housing to be movably accommodated in a state of protruding the positioning pins from the distal end surface and a workpiece receiving face for mounting the vehicle body panel Positioning device. A positioning device comprising a positioning pin for positioning and fixing the vehicle body panel at a working position by being inserted into and fixed to a screw hole of a door mounting nut that is fixed in advance to the vehicle body panel, the screw hole of the nut In the state where the positioning hole corresponding to is provided in the vehicle body panel and the positioning pin is inserted into the positioning hole and the screw hole, a work receiving surface on which the vehicle body panel is placed is provided in the positioning pin. A clamp claw that is movable between an unclamping position located inside and a clamping position that projects outward and clamps the vehicle body panel between the workpiece receiving surface is provided on the positioning pin. Lower click positioning apparatus characterized. A work positioning method for positioning and fixing the vehicle body panel at a working position by inserting and fixing a positioning pin into a screw hole of a door mounting nut fixed in advance to the vehicle body panel, the positioning pin A workpiece positioning method , wherein the body panel is positioned and fixed at a working position by fastening a screw portion provided on the nut to the nut . A work positioning method for positioning and fixing the vehicle body panel at a working position by inserting and fixing a positioning pin into a screw hole of a door mounting nut fixed in advance to the vehicle body panel, the positioning pin Are inserted into the positioning hole of the vehicle body panel provided corresponding to the screw hole of the nut and the screw hole of the nut, respectively, and then the vehicle body panel is placed on the workpiece receiving surface provided on the positioning pin. the clamp jaws provided in the positioning within the pin, word click positioning method, characterized by clamping the body panel between said workpiece receiving surface is protruded outside thereof.

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