JP2006218567A - Workpiece positioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece positioning device having a function equivalent to a conventional one, with simple structure, and reduced in manufacturing cost. <P>SOLUTION: A plurality of positioning gauges 4B are erected on a jig base 1, and each positioning gauge 4B is composed of columnar gauge posts 5 in pairs and a gauge plate 6. Reamer bolts 18 provided at lower ends of the gauge posts 5 are engaged with reamer machining holes 16 previously formed on a reference surface 2a of the jig base 1 for positioning and fixing. A receiving surface 6a for receiving a workpiece, and reamer machining holes 21 in pairs are formed on the gauge plate 6. The reamer machining holes 21 are engaged with reamer bolts 17 provided at upper ends of the gauge posts 5 for positioning and fixing to the gauge posts 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for positioning a workpiece represented by a body part of an automobile, for example, after performing relative positioning of panel-like body parts that constitute a part of the body of an automobile. The present invention relates to a workpiece positioning device used when spot welding is performed and so-called body parts are welded and assembled.

  When welding and assembling body parts as described in Patent Document 1, since it is necessary to perform relative positioning of panel-like body parts as workpieces in advance, a large number of positioning gauges are provided on the jig base. A positioning jig is used as a workpiece positioning device that is erected.

  For example, as shown in FIG. 8, this positioning jig is a jig base 101 formed by combining and welding a base board 102 having precision machined on both front and back surfaces and a skeleton member 103 such as a steel mold, and the bottom four corners thereof. The leg 104 is connected with a bolt 105, while positioning gauges 107A and 107B having a gauge plate 106 having a receiving surface 106a corresponding to the cross-sectional shape of the workpiece on the jig base 101 as a main element, A locate pin unit 108 having a locate pin 108a is provided upright. Among the above positioning gauges 107A and 107B, 107A having only a so-called positioning function of only the gauge plate 106, and a positioning function by the gauge plate 106, in addition to the driving of the clamp cylinder 109 attached to the gauge plate 106. 107B having a so-called clamping function by the clamp arm 110 is mixed, and both types are not cured through the gauge plate 106 alone but through a gauge post 111 assembled in a substantially T shape in plan view. Stands on the tool base 101.

More specifically, for example, when the positioning gauge 107B with the clamp function is taken as an example, a lower portion of the cage post 11 is seated on the base board 102 of the jig base 101 as shown in FIG. The bolt 112 and the knock pin 113 are positioned and fixed, and the gauge plate 106 is similarly positioned and fixed to the upper end portion of the gauge post 11 with a plurality of bolts 112 and the knock pins 113. Further, a clamp cylinder 109 is connected to the gauge plate 106, and a clamp arm 110 that is clamped and unclamped according to the expansion and contraction operation of the clamp cylinder 109 is connected via an intermediate link 114 and a hinge pin 115. .
JP 2003-71571 A

  In such a conventional structure, since the jig base 101 is a structure in which the base board 102 and the skeleton member 103 are integrated by welding, not only the welding cost is high, but the structure is complicated and the weight is increased. There is a defect as listed below as a whole jig.

  (1) Since the jig base 101 has a welded structure, it is necessary to perform a heat treatment such as annealing in order to stabilize the machining accuracy of the base board 102, which tends to increase costs.

  (2) Since it is necessary to perform machining on both the front and back surfaces of the base board 102, the cost is likely to increase.

  (3) The number of reamer holes 117 for the knock pins 113 in addition to the screw holes 116 to be machined in the base board 102 is large, which tends to increase the cost.

  (4) Since the weight of the jig base 101 is large, a solid leg 104 is required, which tends to increase costs and further increase the weight.

  (5) The gauge post 111 has a structure assembled by welding a plurality of steel plates and the like, and as shown in FIG. 9, the coupling surface to the gauge plate 106 and the seating surface to the base board 102 are perpendicular to each other. It must be finished with high precision, which tends to increase costs.

  (6) There are a large number of reamer holes for the knock pins 113 in addition to screw holes and bolt holes to be processed in the gauge post 111 and the gauge plate 106, and this tends to increase costs.

  The present invention has been made paying attention to such problems, and in particular, an object of the present invention is to provide a workpiece positioning device that has a function equivalent to that of a conventional one but simplifies the structure and reduces manufacturing costs. Is.

  The invention according to claim 1 is a positioning device in which a plurality of positioning gauges for positioning and supporting a workpiece are provided on a jig base, and the jig base has a leg portion mounted on the lower surface. The upper surface of the single plate material is finished to a predetermined flatness to serve as a reference surface, and a plurality of sets of reamed holes are formed on the reference surface. On the other hand, the positioning gauge is individually positioned and fixed to the reference surface by fitting and holding in at least two of the fitting shaft portions formed at both ends in the reamed hole. In addition to a plurality of pairs of column-shaped gauge posts that have the same length and at least two pairs, a workpiece receiving surface that directly supports the workpiece to be positioned, and the above-mentioned fitting shaft portion At least two reamed holes are formed, and the reamed holes are fitted and held against the other of the fitting shafts at both ends of the gauge post. And a gauge body individually positioned and fixed to the gauge post.

  In this case, as described in claim 2, a part of the positioning gauges on the reference surface has a function of clamping the workpiece supported and positioned in addition to a function of positioning and supporting the workpiece. The gauge main body of the positioning gauge includes a clamp member that clamps a workpiece with the gauge main body, and an actuator such as a clamp cylinder that clamps and unclamps the clamp member.

  According to a third aspect of the present invention, the fitting shaft portion is a reamer bolt formed integrally with the gauge post, and is fitted with a reaming hole on the other side and combined with a nut to form a jig. It is desirable to be fastened to the base or gauge body.

  Therefore, in at least the first aspect of the present invention, the gauge body that directly supports the workpiece to be positioned is mounted on the jig base with the mutual fitting of the reamed hole and the corresponding fitting shaft portion. A conventional workpiece positioning device that is supported by the reamed hole and the fitting shaft corresponding to each other at the upper end of a set of at least two round pillar-shaped gauge posts. Exactly the same function is demonstrated.

  According to the first aspect of the invention, the structure of the jig base and the gauge post itself is simplified as compared with the conventional one, and the jig base, the gauge post, and the gauge main body are also simplified. Since the number of holes such as reamer holes to be machined is greatly reduced, it is possible to simplify the structure of the entire workpiece positioning device and to greatly reduce the manufacturing cost.

  1 to 3 show a more specific embodiment of the workpiece positioning device according to the present invention, in particular FIG. 1 shows the entire structure thereof, and FIGS. 2 and 3 show the details of the essential parts of FIG. Yes.

  As shown in FIG. 1, the workpiece positioning device includes a jig base 1 formed by projecting downward a plurality of round pillar-shaped legs 3, 3,. The plurality of positioning gauges 4A and 4B and the locating pin unit 4C which are erected on the jig base 1 are configured. Each of the positioning gauges 4A and 4B includes a pair of round pillar-shaped gauge posts 5 and 5 and a gauge plate 6 as a gauge body connected to the upper ends of the gauge posts 5 and 5, as will be described later. Among the positioning gauges 4A and 4B, there are 4A having a function of directly positioning and supporting a workpiece with a receiving surface 6a formed on the gauge plate 6, and a workpiece positioning function by the receiving surface 6a. In addition to the above, there is a mixture of a clamp arm 8 attached to the gauge plate 6 and a clamp arm 8 driven by the clamp cylinder 7 having a function of clamping the workpiece supported and positioned between the gauge plate 6 and the gauge plate 6.

  The base board 2, which is the main element of the jig base 1, is provided with positioning gauges 4A, 4B, etc. by performing precision machining so that at least the upper surface (surface) thereof has a predetermined flatness and surface roughness. On the other hand, as shown in FIG. 2, bolt holes 9 of a predetermined size for connecting the round columnar legs 3 are formed through a plurality of locations on the peripheral edge of the base board 2 as shown in FIG. 2. . Screw holes (female thread portions) 10 are formed in the upper and lower ends of the leg portion 3 in advance, and the round columnar leg portion 3 is formed on the lower surface of the base board 2 with the screw hole 10 at the upper end, the bolt 11 and the washer 12. It is firmly fixed so that it can be seated on. Further, as shown in FIG. 3 in addition to FIG. 2, an adjusting bolt 14 with a lock nut 13 is screwed into the screw hole 10 at the lower end of the leg 3, and the adjusting bolt 14 attached to each leg 3 is attached. By adjusting the appearance appropriately, the level of the base board 2, that is, the level can be adjusted. That is, as is clear from FIG. 3, the height H1 from the floor to the reference surface 2a of the base board 2 is regulated by the leg 3 with the adjusting bolt 14 and the spacer 15.

  The details of the plurality of positioning gauges 4A and 4B on the jig base 1 will be described by taking an example of a 4B having a clamp function as an example. As shown in FIG. A high-precision reamed hole 16 is formed in advance at a predetermined pitch P so as to correspond to the gauge posts 5 and 5 at the standing position of the round pillar-shaped gauge posts 5 and 5. It is. The reamed hole 16 referred to here is a hole finished with high precision by reaming for fitting with a reamer bolt 17 or 18 to be described later.

  On the other hand, a reamer bolt 17 as a fitting shaft portion of the same size having a smaller diameter than the maximum diameter of the general portion 5a of the gauge posts 5 and 5 is provided at both ends of the round columnar gauge posts 5 and 5 as a pair. Alternatively, 18 are integrally formed so as to be located on the same axis. Then, while the reamer bolt 18 at the lower end of the gauge post 5 is fitted into the reamer processing hole 16, the shoulder surface 5b formed by the general portion 5a of the gauge post 5 and the reamer bolt 18 is used as a seating surface on the base board 2. The gauge posts 5 and 5 are fastened and fixed on the base board 2 in an upright posture by tightening nuts 19 together with washers 20 from the lower surface (back surface) side of the base board 2.

  Similarly, a pair of reamer holes 21 are formed in the seat portion 6b at the lower end of the gauge plate 6 in advance at a predetermined pitch, and the reamer hole 21 on the side of the seat portion 6b is the same as described above. Is fitted to the reamer bolt 17 at the upper end of the gauge posts 5, 5, and the shoulder surface 5 b formed by the general portion 5 b of the gauge posts 5, 5 and the reamer bolt 17 is used as a seating surface. The gauge plate 6 is fastened and fixed on the pair of gauge posts 5 and 5 in an upright posture by tightening the nut 22 together with the washer 23 from the upper surface (back surface) side of the seat portion 6b. . That is, the height position of the gauge plate 6 from the base board 2 is regulated by the dimension H2 formed between the shoulder portions 5b, 5b at the upper and lower ends of the gauge posts 5, 5.

  Further, a trunnion type clamp cylinder 7 as an actuator and a clamp arm 8 as a clamp member to be clamped and unclamped thereby are shaken on the gauge plate 6 via hinge pins 24 or 25, respectively. It is linked movably.

  The locate pin unit 4C shown in FIG. 1 has a round columnar gauge post 26 with a locate pin 26a attached to the upper end of the base plate 2 with the same fitting fit between the reamer bolt and the reamer processed hole. Is standing upright.

  Therefore, according to the workpiece positioning apparatus configured as described above, the clamp arm 8 attached to a part of the positioning gauge 4B is in an unclamped state, and the gauges in the positioning gauges 4A and 4B in addition to the locate pin 26a. The receiving surface 6a of the plate 6 is used as a reference for positioning and supporting a workpiece (not shown) to be positioned on the receiving surface 6a. Then, the clamp arm 8 attached to a part of the positioning gauges 4B is clamped by the clamp cylinder 7 to firmly clamp the work, and then subjected to welding work such as spot welding.

  As described above, the level of the base board 2 is appropriately adjusted by rotating the adjusting bolt 14 attached to each leg 3.

  Although the function as such a workpiece positioning device is basically the same as that of the conventional one shown in FIG. 8, as is clear from the comparison between FIG. 1 and FIG. Therefore, the intended purpose can be achieved with a very simple structure.

  That is, in addition to the comparison between FIG. 1 and FIG. 8, as well as the comparison between FIG. 2 and FIG. 9, not only the structure of the jig base 1 and the gauge post 5 itself is simplified, but also the base Since the number of holes drilled in the panel 2, gauge post 5, and gauge plate 6 and the number of bolts and nuts corresponding to them are greatly reduced, the manufacturing cost of the entire apparatus can be greatly reduced. .

  In addition, since the gauge post 5 has a round columnar simple shape, the gauge post 5 can be manufactured by a lathe process, and this can also greatly reduce the manufacturing cost.

  Here, as apparent from FIG. 4A, the reamer bolt 18 at the lower end of the gauge post 5 is further provided at the tip of the cylindrical shaft portion 18a having a diameter smaller than the maximum diameter of the general portion 5a of the gauge post 5 itself. While the threaded portion 18b having a smaller diameter than the cylindrical shaft portion 18a is formed in a stepped shaft shape, the reamer bolt 17 at the upper end of the gauge post 5 is smaller in diameter than the maximum diameter in the general portion 5a of the gauge post 5 itself as described above. Further, a threaded portion 17b having a diameter smaller than that of the cylindrical shaft portion 17a is formed in a stepped shaft shape at the tip of the cylindrical shaft portion 17a, and the length H3 of the cylindrical shaft portion 17b is set on the lower end side of the cylindrical shaft portion 18b. It is shorter than the length H4 (H3 <H4). At the same time, the reaming hole 21 on the gauge plate 6 side corresponding to the reamer bolt 17 at the upper end of the gauge post 5 is formed in advance as a stepped hole.

  With this configuration, it is necessary to correct the three-dimensional position of the gauge plate 6 in the positioning gauge 4B by a predetermined amount a, b, c after the assembly as the workpiece positioning device is completed, for example, as shown in FIG. When it occurs, there is an advantage that the correction work can be easily handled.

  That is, when the three-dimensional position of the gauge plate 6 is corrected by a predetermined amount a, b, c as shown in FIG. 5, the upper and lower sides of the gauge posts 5, 5 are exchanged as shown in FIG. As a premise, additional processing is performed on the stepped hole-like reamer processing hole 21 in the seat portion 6b on the gauge plate 6 side, and for example, the correction portions a and b are secured by cutting off the hatched portion Q shown in FIG. The diameter of the reamer bolt 18 on the opposite side can be fitted and fitted. At the same time, the above-mentioned correction allowance c is secured by interposing a shim plate 27 having a predetermined thickness, that is, a thickness corresponding to the correction allowance c, between the seat portion 6b and the shoulder surface 5b during the fitting. However, when the height position of the gauge plate 6 with respect to the gauge posts 5 and 5 is lowered, the shoulder surface 5b is additionally processed instead of using the shim plate 27 described above. As described above, the three-dimensional position of the gauge plate 6 can be easily corrected by turning the gauge post 5 upside down.

  FIGS. 6 and 7 show the second and third embodiments of the present invention. In particular, for the purpose of improving the supporting rigidity of the gauge posts 5 and 5 used in pairs, the gauge posts 5 and 5 are shown in FIGS. The example in the case of reinforcing a root part is shown.

  FIG. 6 shows a pair of pressure clamp blocks 31, 31 as pressure clamp members straddling two gauge posts 5, 5 while sitting on the base board 2, and using these clamp blocks 31, 31, two gauges The base portions of the posts 5 and 5 are fastened and fixed together with bolts 32 so as to increase the seating area of the gauge posts 5 and 5 with respect to the base board 2.

  Further, in the example shown in FIG. 7, a tapered cone-shaped enlarged diameter portion 33 is integrally formed in advance at the base portion of each gauge post 5, 5, and the seating area of each gauge post 5, 5 with respect to the base board 2 is similarly determined. This is an enlargement. In particular, in the case of the present embodiment, the span formed by the two gauge posts 5 and 5 can be enlarged at the same time, and there is an advantage that the improvement of the support rigidity becomes more remarkable.

The perspective view which shows the whole structure of the workpiece | work positioning device which concerns on this invention. FIG. 2 is an exploded explanatory view enlarging an A part in FIG. 1. FIG. 3 is an explanatory front view of a main part of FIG. 2. The principal part expanded sectional explanatory drawing of FIG. The perspective view which shows the assembly state of FIG. The principal part perspective view which shows the 2nd Embodiment of this invention. The principal part perspective view which shows the 3rd Embodiment of this invention. The perspective view which shows an example of the conventional workpiece | work positioning device. The principal part expanded sectional explanatory drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Jig base 2 ... Base board 2a ... Reference surface 3 ... Leg part 4A, 4B ... Positioning gauge 5 ... Gauge post 5a ... General part 5b ... Shoulder surface (stepped part)
6. Gauge plate (gauge body)
6a ... Receiving surface 7 ... Clamp cylinder (actuator)
8. Clamp arm (clamp member)
13 ... Lock nut 14 ... Adjust bolt 16 ... Reamed hole 17 ... Reamer bolt (fitting shaft)
17a ... Cylindrical shaft portion 17b ... Male thread portion 18 ... Reamer bolt (fitting shaft portion)
18a ... Cylindrical shaft portion 18b ... Male thread portion 21 ... Reamed hole 31 ... Pressure clamp block (pressure clamp member)
33 ... Diameter expansion part

Claims (8)

It is a positioning device in which a plurality of positioning gauges for positioning and supporting a workpiece are set up on a jig base,
The jig base has a reference surface by finishing the upper surface of a single plate with legs attached to the lower surface to a predetermined flatness, and has at least two reamed holes on the reference surface. While several sets are formed,
The positioning gauge is
At least two of the fitting shaft portions formed at both ends have the same length and are individually positioned and fixed to the reference surface by fitting and holding in at least two pairs of the reamed holes. Multiple pairs of column-shaped gauge posts,
In addition to the workpiece receiving surface that directly positions and supports the workpiece to be positioned, at least two reamed holes corresponding to the fitting shaft portion are formed. A gauge body that is individually positioned and fixed to a pair of gauge posts by fitting and holding the other of the fitting shafts at both ends of the gauge post,
A workpiece positioning device comprising: Some positioning gauges on the reference surface have a function of clamping the workpiece supported and positioned in addition to the function of positioning and supporting the workpiece.
2. The gauge main body in a part of the positioning gauges includes a clamp member that clamps a workpiece with the gauge main body, and an actuator that clamps and unclamps the clamp member. Work positioning device.   The fitting shaft part is a reamer bolt formed integrally with the gauge post, and is fitted to the mating reamer hole, and then combined with the jig base or gauge body in combination with the nut. The work positioning apparatus according to claim 1, wherein the work positioning apparatus is provided. The reamer bolt is a stepped bolt shape having a threaded portion having a smaller diameter at the tip of a cylindrical shaft portion having a diameter smaller than the general diameter of the gauge post,
The length of the cylindrical shaft part that fits into the reaming hole on the jig base side is set larger than the length of the cylindrical shaft part that fits into the reaming hole on the gauge body side,
4. The gauge post is configured to be seated on each of a jig base and a gauge body with a stepped portion formed by the gauge post and cylindrical shafts at both ends thereof as a seating surface. Work positioning device.   5. The workpiece positioning apparatus according to claim 4, wherein the reamed hole on the gauge body side is formed as a stepped hole shape.   The leg is a round column, and the upper end is seated on the jig base and fastened with bolts, while the grounding surface is fitted with level adjustment bolts with lock nuts. The work positioning apparatus according to claim 1, wherein the work positioning apparatus is provided.   The gauge posts arranged in parallel as at least two pairs are clamped by a pressure clamp member shared by the plurality of gauge posts, and the plurality of gauge posts are connected to each other. The workpiece positioning apparatus according to any one of the above.   The workpiece positioning device according to any one of claims 1 to 6, wherein a diameter of a seating surface of the gauge post with respect to the jig base is set larger than a diameter of a general portion of the gauge post.

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