JP7038973B2 - Work gripping jig and work gripping device - Google Patents

Description

The present invention relates to a work gripping jig and a work gripping device, and more particularly to a work gripping jig and a work gripping device suitable for gripping a work having a protrusion such as a flange.

A friction joining device is known in which two workpieces are butted against each other and the frictional heat generated by rotating or vibrating one workpiece with respect to the other workpiece is used to soften the workpieces and join the workpieces at a high pressure. There is. In this case, since a large load (torque) is generated in the work in the rotation direction or the vibration direction, it is necessary to firmly grip the work.

As a method for gripping such a work, a method using a so-called collet chuck mechanism may be adopted. However, with a general collet chuck, it is structurally impossible to grip the work in the vicinity of the joint. Therefore, in the invention described in Patent Document 1, a jig (for example, sabot 107, spring ring 108) that can be divided in the circumferential direction is used in the inner peripheral portion of the tip of the collet.

U.S. Pat. No. 5248078

However, in the configuration described in FIG. 5 of Patent Document 1, since the divided pieces of the jig (spring ring 108) are connected in front of the joint surface side, for example, flanges are attached to both workpieces to be frictionally joined. If it is formed, the workpieces will be joined with the front surfaces of the jig (spring ring 108) facing each other, and the divided pieces of the jig (spring ring 108) can be removed. There is a problem that it disappears.

Further, in the configuration described in Patent Document 1, the position of the connecting member is fixed even though the divided piece of the jig (spring ring 108) is configured to be retractable in the radial direction. Therefore, there is a problem that the connecting member hinders the contraction of the divided piece and it is not possible to apply an even gripping force to the outer periphery of the work.

The present invention has been devised in view of such a problem, and even a work having a protruding portion such as a flange can be removed without interfering with the protruding portion, and an even gripping force is applied to the outer periphery of the work. It is an object of the present invention to provide a work gripping jig and a work gripping device that can be applied.

According to the present invention, it is a work gripping jig provided with an opening into which a work can be inserted in a central portion, and a plurality of divided pieces divided in the circumferential direction and the divided pieces arranged on the side surface of the divided pieces. Each of the divided pieces includes a connecting member that connects the two inwardly contractably, and each of the divided pieces has a recess formed at both ends in the circumferential direction of the side surface and a retaining hole formed in the recess. Provided is a work gripping jig characterized by being provided .

Further, according to the present invention, a work gripping jig having an opening into which a work can be inserted in the central portion, a collet for accommodating the work gripping jig inwardly and retractably, and the collet inwardly. A work gripping device including a holder that holds the work in a retractable manner, wherein the work gripping jig holds a plurality of divided pieces divided in the circumferential direction and the divided pieces arranged on the side surface of the divided pieces. Each of the divided pieces comprises a connecting member that is retractably connected inward, and each of the divided pieces includes recesses formed at both ends in the circumferential direction of the side surface and retaining holes formed in the recesses. A work gripping device characterized by this is provided.

Further, the connecting member includes a connecting plate having an elongated hole that can be arranged so as to straddle the retaining hole of an adjacent divided piece, and a fastener connected to the retaining hole via the elongated hole. You may be prepared.

Further, the work may have a protruding portion protruding outward from the end face, and the divided piece may be arranged between the end face and the protruding portion.

According to the work gripping jig and the work gripping device according to the present invention described above, when the divided pieces are connected from the side surface by a connecting member, for example, the works having a protruding portion such as a flange are frictionally joined to each other. However, the connecting member can be easily accessed and removed from the side surface of the divided piece, and the work gripping jig can be easily removed by disconnecting the divided pieces.

Further, according to the present invention, by connecting the divided pieces inwardly with a connecting member, when the divided pieces are contracted inward to grip the work, the gripping force is evenly applied to the outer periphery of the work. Can be granted.

It is a perspective view which shows the friction bonding apparatus which used the workpiece gripping apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the work gripping apparatus (rotational side) shown in FIG. It is a perspective view of the work gripping jig shown in FIG. It is an enlarged view which shows the connection part of the work gripping jig shown in FIG. 3, (a) shows the state before connection, and (b) shows the state after connection. It is sectional drawing which shows the attachment / detachment method of the work gripping jig, (a) shows the gripping state, (b) shows the removing state.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5 (b). Here, FIG. 1 is a perspective view showing a friction joining device using the work gripping device according to the embodiment of the present invention. FIG. 2 is a cross-sectional view of the work gripping device (rotating side) shown in FIG. FIG. 3 is a perspective view of the work gripping jig shown in FIG. 4A and 4B are enlarged views showing a connecting portion of the work gripping jig shown in FIG. 3, where FIG. 4A shows a state before connection and FIG. 4B shows a state after connection.

As shown in FIGS. 1 to 3, the work gripping device 1 according to the embodiment of the present invention includes a work gripping jig 2 having an opening 20 into which a work W can be inserted in the central portion, and a work gripping jig 2. The work gripping jig 2 includes a collet 3 for accommodating the tool 2 inwardly and a holder 4 for holding the collet 3 inwardly, and the work gripping jig 2 is divided into two parts in the circumferential direction. The pieces (first divided piece 21 and second divided piece 22) and the first divided piece 21 and the second divided piece 22 are arranged on the side surfaces of the first divided piece 21 and the second divided piece 22 so that the first divided piece 21 and the second divided piece 22 can be shrunk inward. A connecting member 23 for connecting is provided.

Here, the work gripping device 1 shown in FIG. 1 is applied to a friction joining device that frictionally joins the works W to each other. The friction joining device includes, for example, a work gripping device 1 that grips the work W on the rotating side, a driving means 5 that rotates the work W on the rotating side together with the work gripping device 1, and a work gripping device that grips the work on the fixed side. It is provided with (not shown in FIG. 1) and fixing means 6 configured so that the work on the fixed side can be brought into contact with the work W on the rotating side.

An actuator for rotating the work gripping device 1 is arranged inside the drive means 5. Further, the fixing means 6 is movably arranged on the rail R, and the fixing means 6 is moved toward the driving means 5 by pressing the fixing means 6 with a hydraulic cylinder (not shown), and the work W on the rotating side is used. It is configured so that the end face of the work and the end face of the work on the fixed side are brought into contact with each other. The configuration of the friction joining device is not limited to the configuration shown in the figure.

Further, in the present specification, for convenience of explanation, as shown in FIG. 1, the X-axis is set in the moving direction of the fixing means 6, the Y-axis is set in the horizontal direction perpendicular to the X-axis, and Z is set in the vertical direction. The axis shall be set.

Here, the cross-sectional view shown in FIG. 2 is a cross-sectional view showing a peripheral portion of the work gripping device 1 of the driving means 5. As shown in FIG. 2, the work W has a substantially cylindrical shape, and has an end face Wa constituting a joint surface and a flange-shaped protrusion Wb protruding outward from the end face Wa, for example. And have.

Further, the drive means 5 includes a rotary shaft 51 that is rotationally driven by a drive motor, and a holder 4 of the work gripping device 1 is fixed to the tip of the rotary shaft 51. Further, the axial center portion of the rotating shaft 51 includes a spacer 52 connected to the collet 3 of the work gripping device 1 and a hydraulic cylinder 53 connected to the spacer 52.

In FIG. 2, only the cylinder head of the hydraulic cylinder 53 is shown, and the figure of the hydraulic cylinder main body is omitted. With this configuration, after the collet 3 is inserted into the holder 4, the collet 3 can be pulled in the negative direction of the X-axis by the hydraulic cylinder 53. The mechanism for pulling the collet 3 into the holder 4 is not limited to the hydraulic cylinder 53, and other means may be used.

As shown in FIG. 2, the work gripping jig 2 is a substantially disk-shaped component arranged between the end surface Wa of the work W and the projecting portion Wb. Further, the work gripping jig 2 includes, for example, as shown in FIG. 3, a first divided piece 21 and a second divided piece 22 having a shape in which a substantially disk-shaped part is divided into upper and lower parts. When the first divided piece 21 and the second divided piece 22 are connected, a circular opening 20 into which the work W can be inserted is formed in the central portion. It should be noted that the peripheral surface forming the opening 20 may be formed with irregularities for improving the gripping force.

Further, the first divided piece 21 and the second divided piece 22 have a plurality of slits S formed radially in the radial direction, and when an external force is applied inward in the radial direction, the gaps in the slits S are formed. It is configured to be able to shrink inward in the radial direction by shrinking. The arrangement of the slits S is arbitrary and is not limited to the arrangement shown in the figure.

Further, in the present embodiment, the case where the work gripping jig 2 is divided into the first divided piece 21 and the second divided piece 22 is described, but the work gripping jig 2 is divided into three or more divided pieces. You may try to do it.

As shown in FIGS. 3 and 4A, the first divided piece 21 has recesses 21a and 21b formed at both ends in the circumferential direction of the side surface, and retaining holes 21c formed in the recesses 21a and 21b. It is equipped with 21d. Similarly, the second divided piece 22 also has recesses 22a and 22b and retaining holes 22c and 22d.

As shown in FIGS. 3 and 4B, for example, the connecting member 23 has a retaining hole 21c (retaining hole 21d) of the adjacent first dividing piece 21 and a retaining hole 22c (retaining hole) of the second dividing piece 22. 22d) A connecting plate 24 having a long hole 24a that can be arranged across the long hole 24a, and four fasteners 25 connected to the retaining holes 21c, 21d, 22c, 22d via the long hole 24a. I have. Further, the connecting plate 24 has an outer shape and a thickness that can be accommodated in the space formed by the recesses 21a and 21b or the recesses 22a and 22b that are connected to each other.

When the first divided piece 21 and the second divided piece 22 are fitted to the outer periphery of the work W and combined, as shown in FIG. 4A, the spaces communicated by the recesses 21a and 21b (recesses 22a and 22b) that are connected to each other are formed. It is formed. The connecting plate 24 is inserted into this space, and the fastener 25 is fixed to the retaining holes 21c, 21d, 22c, 22d. The fastener 25 may be a bolt, a pin, or a screw.

By connecting the first divided piece 21 and the second divided piece 22 by the connecting member 23, the first divided piece 21 and the second divided piece 22 are arranged in an annular shape on the outer periphery of the work W. After that, when an external force is applied to the first divided piece 21 and the second divided piece 22 from the outer circumference, the first divided piece 21 and the second divided piece 22 contract inward in the radial direction. At this time, since the fastener 25 is inserted through the elongated hole 24a, the fastener 25 is arranged so as to be slidable along the longitudinal direction of the elongated hole 24a.

Therefore, the fastener 25 can also move following the contraction of the first divided piece 21 and the second divided piece 22. Therefore, even in a state where the first divided piece 21 and the second divided piece 22 are connected by the connecting member 23, the connecting member 23 is the second to the external force applied to the first divided piece 21 and the second divided piece 22. A uniform gripping force can be applied to the outer periphery of the work W without hindering the contraction of the one-divided piece 21 and the second divided piece 22.

The connecting member 23 is not limited to the illustrated configuration. For example, although not shown, it may be composed of four fasteners 25 connected to each retaining hole 21c, 21d, 22c, 22d, and a chain connecting adjacent fasteners 25 to each other. By connecting the fasteners 25 to each other with a chain, the first divided piece 21 and the second divided piece can be contracted inward in the radial direction due to the slack of the chain. Further, instead of the chain, an elastic band may be used to restrain the adjacent fasteners.

The collet 3 has a substantially cylindrical shape, and a space 31 capable of accommodating the work W is formed therein. A space into which the work gripping jig 2 can be inserted is formed on the tip end side (plus direction side of the X axis) of the collet 3, and the work gripping jig 2 is positioned by the stopper 32 protruding inward. Further, the rear end side (the negative direction side of the X axis) of the collet 3 has a structure that can be connected to the spacer 52.

Further, a plurality of slits are formed in the tubular portion on the tip end side of the collet 3 in the axial direction, and the tip end side of the collet 3 is configured to be retractable inward in the radial direction. Further, a tapered surface 33 having a diameter expanded from the rear end side to the tip side is formed on the outer peripheral portion of the collet 3 on the tip end side. Depending on the length of the work W, a spacer 34 for positioning may be arranged on the collet 3.

The holder 4 has a substantially cylindrical shape, and a space 41 into which the collet 3 can be inserted is formed inside. An annular recess 42 is formed on the tip end side (plus direction side of the X axis) of the holder 4. A ring member 45 having a tapered surface 43 corresponding to the tapered surface 33 of the collet 3 is inserted into the recess 42. By configuring the ring member 45 so as to be separable from the holder 4, the ring member 45 can be changed according to the shape and size of the collet 3, and the tapered surface 43 of the ring member 45 is formed on the tapered surface 33 of the collet 3. It can be properly contacted.

When the work W is gripped and fixed to the holder 4 by using the work gripping device 1 described above, the procedure is as follows. First, the collet 3 is inserted in advance into the space 41 of the holder 4. Next, the first division piece 21 and the second division piece 22 are arranged on the outer periphery of the work W, and the first division piece 21 and the second division piece 22 are connected by the connecting member 23.

Next, the work W and the work gripping jig 2 are inserted into the space 31 of the collet 3. After that, the collet 3 is pulled in the negative direction of the X-axis by the hydraulic cylinder 53, so that the tapered surface 33 of the collet 3 is brought into contact with the tapered surface 43 of the holder 4.

By moving the collet 3 while sliding along the tapered surfaces 33 and 43, an external force is applied radially inward to the tip of the collet 3, and the outer circumference of the work gripping jig 2 is radially inward. External force to go is given. Due to this external force, the first divided piece 21 and the second divided piece 22 contract inward in the radial direction, and the work W is firmly gripped. Further, by using the work gripping jig 2, it is possible to grip the work W while holding the center of rotation of the rotating shaft 51 and the center of the work W coaxially with high accuracy.

In the above-described embodiment, the work W on the rotating side is described, but the work on the fixed side can also be gripped by the same mechanism as the work gripping device 1.

Further, in the above-described embodiment, the case where only the collet 3 is inserted into the holder 4 in advance is described, but after the work gripping jig 2 is placed on the work W, the work gripping jig 2 is inserted into the collet 3. It may be inserted and the work gripping jig 2 and the work W together with the collet 3 may be inserted into the holder 4.

Here, FIG. 5 is a cross-sectional view showing a method of attaching and detaching the work gripping jig, where FIG. 5A shows a gripping state and FIG. 5B shows a removing state. Further, FIGS. 5 (a) and 5 (b) show a case where the work W on the rotating side and the work W'on the fixed side are frictionally joined by using the friction joining device shown in FIG. .. In each figure, for convenience of explanation, the figure is omitted for the configuration of the work gripping device other than the work gripping jig.

Further, in FIGS. 5A and 5B, the end face of the work W on the rotating side is designated by the symbol Wa, the protruding portion of the work W is designated by the reference numeral Wb, the workpiece gripping jig on the rotating side is designated by reference numeral 2, and the work gripping jig. The first divided piece of 2 is designated by reference numeral 21, the second divided piece of the work gripping jig 2 is designated by reference numeral 22, the end face of the work W'on the fixed side is designated by reference numeral Wa', and the protruding portion of the work W'is designated by reference numeral Wb'. The work gripping jig on the side is designated by reference numeral 2', the first divided piece of the work gripping jig 2'is designated by reference numeral 21', and the second divided piece of the work gripping jig 2'is designated by reference numeral 22'.

As shown in FIG. 5A, the portion between the end surface Wa of the work W and the protruding portion Wb is gripped by the work gripping jig 2 by the above-mentioned procedure, and the driving means is gripped via the collet 3 and the holder 4. Fix the work W to 5. Similarly, the portion between the end surface Wa'and the protruding portion Wb'of the work W'is gripped by the work gripping jig 2'and the work W'is fixed to the fixing means 6. In this state, the work W is rotated by the drive means 5, the fixing means 6 is pressed in the minus X direction by the hydraulic cylinder, and the work W'is pressed against the work W to frictionally join the end face Wa and the end face Wa'. Can be done.

When the work W and the work W'are frictionally joined, the work gripping jigs 2 and 2'are sandwiched between the protruding portion Wb of the work W and the protruding portion Wb'of the work W', and the work is gripped. Jigs 2 and 2'cannot be pulled out in the axial direction. Therefore, by removing the connecting member 23 (see FIGS. 3 and 4 (b)) that connected the first divided piece 21 and the second divided piece 22, the work can be gripped as shown in FIG. 5 (b). The jig 2 can be separated into the first divided piece 21 and the second divided piece 22, and the work gripping jig 2 can be removed from the work W.

At this time, since the connecting member 23 is arranged on the side surface of the first divided piece 21 and the second divided piece 22 as described above, the work gripping jig 2 is between the two protrusions Wb and Wb'. Even if it is sandwiched between the jigs, it can be easily accessed. Similarly, the work gripping jig 2'can also be easily separated into the first divided piece 21'and the second divided piece 22', and the work gripping jig 2'can be removed from the work W'. ..

The present invention is not limited to the above-described embodiment, and is not limited to the above-described embodiment. Of course, various changes can be made within the range not specified.

1 Work gripping device 2, 2'Work gripping jig 3 Collet 4 Holder 5 Driving means 6 Fixing means 20 Openings 21, 21'First split pieces 21a, 21b, 22a, 22b Recesses 21c, 21d, 22c, 22d Retaining holes 22, 22'Second division piece 23 Connecting member 24 Connecting plate 24a Long hole 25 Fastener 31 Space 32 Stopper 33 Tapered surface 34 Spacer 41 Space 42 Recessed 43 Tapered surface 45 Ring member 51 Rotating shaft 52 Spacer 53 Hydraulic cylinder

Claims (4)

A work gripping jig with an opening in the center where the work can be inserted.
Multiple pieces divided in the circumferential direction and
A connecting member arranged on the side surface of the divided pieces and connecting the divided pieces inward so as to be contractible, and the like.
Each of the divided pieces includes recesses formed at both ends in the circumferential direction of the side surface, and retaining holes formed in the recesses.
A work gripping jig characterized by this. A claim that the connecting member comprises a connecting plate having an elongated hole that can be arranged so as to straddle the retaining hole of an adjacent divided piece, and a jig connected to the retaining hole via the elongated hole. Item 1. The work gripping jig according to Item 1. The work gripping jig according to claim 1, wherein the work has a protruding portion protruding outward from the end face, and the divided piece is arranged between the end face and the protruding portion. A work gripping jig having an opening into which a work can be inserted in the center, a collet for accommodating the work gripping jig inwardly, and a holder for holding the collet inwardly. It is a work gripping device equipped with
The work gripping jig according to any one of claims 1 to 3 , wherein the work gripping jig is the work gripping jig.

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