JP2022019160A - Holding jig for l-shaped tube body - Google Patents

Abstract

To provide a holding jig capable of efficiently processing both end parts of an L-shaped tube body.SOLUTION: A holding jig holds an L-shaped tube body W having an axis bent at an angle θ, and comprises: a base body 10 to be attached to a machine tool; a rotary holding body 20 to be relatively rotatably installed on the base body 10; and a clamp mechanism 14 for fixing the rotary holding body 20 to the base body 10. The base body 10 has an installation surface 11a, and an inclined plane 12a inclined at an angle of (90°-θ/2) to an axis orthogonal to the installation surface 11a. The rotary holding body 20 is rotatably held on the inclined plane 12a of the base body 10 while centering at an axis orthogonal to the inclined plane 12a. The rotary holding body 20 has a holding mechanism 25 which holds the tube body W in an attitude such that a bent part of the tube body W lies close to the inclined plane and in an attitude such that a plane including the axis of the tube body W is orthogonal to the inclined plane 12a and the axis of one end part is orthogonal to the installation surface.SELECTED DRAWING: Figure 1

Description

There is an application for application of Article 30, Paragraph 2 of the Patent Law. Published to SJ Petroleum Machinery Company on July 19, 1st year of Reiwa.

The present invention relates to a holding jig for holding an L-shaped tube whose axis is bent like a hook. More specifically, the present invention holds the tube so that both ends of the tube can be indexed to a processing position. Regarding holding jigs.

Conventionally, various tubes such as tubes for transporting liquids have been used. Such pipes are generally adapted to form the required pipes by sequentially joining objects of a set standard length. For this reason, conventionally, attempts have been made to machine the end portion of the pipe body so that the connecting portion is closely connected.

As a processing device for processing the end portion of the pipe body, an end face processing device disclosed in Patent Document 1 below has been conventionally proposed. This end face processing device processes a straight steel pipe, and is composed of a pedestal (so-called bed), a fixing mechanism and a grinder support mechanism provided on the pedestal, and a grinder supported by the grinder support mechanism. Has been done. The fixing mechanism includes a rotary table (so-called spindle) and a chuck attached to the rotary table, and the rotary table is rotated while one end side of the steel pipe is fixed (grasped) by the chuck. The steel pipe can be rotated around its axis. Then, in this way, with the steel pipe rotated, the end face on the other end side of the steel pipe is ground by the grinder.

When the machining of the other end of the steel pipe is completed, the steel pipe is removed from the chuck, and then the other end of the machining is gripped by the chuck, and the steel pipe is rotated about the center of the axis in the same manner as described above. In this state, the end face on one end side of the steel pipe is ground using the grinder. From the above, both ends of the steel pipe can be ground.

Japanese Patent No. 6587261

By the way, the steel pipe includes not only a linear one but also an L-shaped one whose axis is bent at a predetermined angle, and the linear steel pipe and this L-shaped steel pipe are connected in combination. Can form pipelines of various routes.

Therefore, even for this L-shaped steel pipe, if both ends thereof can be processed, the connected steel pipes can be closely connected to each other. However, equipment capable of efficiently processing this L-shaped steel pipe has not been provided so far. For this reason, conventionally, for example, when forming a pipeline using an L-shaped steel pipe, flanges are formed at both ends of the L-shaped steel pipe, and flanges are formed at both ends of the L-shaped steel pipe, and at the end of the steel pipe connected to the L-shaped steel pipe. In addition, a flange was formed, and a packing or the like was sandwiched between the two flanges without processing the end face of the flange, and these were joined by using bolts and nuts.

However, in such a joining mode, it is not always possible to realize a sufficiently close joining. Further, in recent years, pipe bodies have been used for a wide variety of purposes, and in a stricter sense, a joining form with a high degree of closeness is required. Therefore, in order to meet such demands, it would be beneficial if both ends of the L-shaped tube could be machined. Further, some pipe bodies such as steel pipes and iron pipes are considerably heavy in weight, and it is more useful if such a heavy L-shaped pipe body can be efficiently processed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a holding jig capable of efficiently processing both ends of an L-shaped tube.

The present invention for solving the above problems
It is a holding jig configured to hold an L-shaped tube whose axis is bent like a hook at an internal angle of angle θ, and to index both ends of the tube to positions where they can be processed.
It is configured to include a substrate to be attached to a machine tool, a rotation holder that is relatively rotatably mounted on the substrate, and a clamp mechanism that fixes the rotation holder to the substrate.
The substrate has a mounting surface mounted on the machine tool and an inclined surface inclined at an angle of (90 ° −θ / 2) with respect to an axis orthogonal to the mounting surface.
The rotation holder is rotatably held on the inclined surface of the substrate with an axis orthogonal to the inclined surface as a rotation center axis.
Further, in the rotation holding body, the bent portion of the tubular body is in a posture close to the inclined surface, the plane including the axis of the tubular body is orthogonal to the inclined surface, and the axial line of one end thereof is the inclined surface. It is equipped with a holding mechanism that can hold the tube so that it is in a posture orthogonal to the mounting surface.
By rotating the rotation holding body around the rotation center axis, both ends of the tube body are indexed to positions where the axes are orthogonal to the mounting surface and can be processed. The present invention relates to a holding jig for an L-shaped tubular body configured so as to be capable of.
The angle θ has a practical range of 30 ° to 150 °, a more practical range of 45 ° to 135 °, and a more practical range of 80 ° to 120 °.

In this L-shaped tube holding jig, the holding mechanism provided in the rotation holding body allows the L-shaped tube to be held in a posture in which the bent portion is close to the inclined surface and the axis of the tube. The plane including the above is held so as to be orthogonal to the inclined surface and the axis of one end to be orthogonal to the mounting surface.

This holding jig can be applied to a machine tool such as a vertical or horizontal machining center, for example. In the case of a vertical machining center, for example, by mounting the holding jig on the table so that the mounting surface of the substrate is joined to the upper surface of the table, the pipe body held by the holding jig is processed. can do. Further, in the case of a horizontal machining center, for example, the holding jig is held by the holding jig by attaching the holding jig in a state where the mounting surface of the substrate is joined to the side surface of the ikeel fixed on the table. The tube can be processed. At that time, the holding jig may be attached to the machining center and then the tube body may be attached to the holding jig, or the holding jig may be attached to the holding jig first and then the holding jig may be attached to the machining center. It may be attached to.

Thus, in the tube body attached to the holding jig, the axis of one end thereof is in a posture orthogonal to the mounting surface of the substrate and the upper surface of the table. , Inner diameter machining can be performed using a boring tool, end face machining and outer diameter machining of the end can be performed using an end mill, and outer diameter machining using a tool dedicated to outer diameter machining. It can be performed.

Then, when the rotation holding body is released from being fixed to the substrate by the clamping mechanism and the rotation holding body is rotated by 180 ° about the rotation center axis, the other end portion of the tube body is rotated. It can be indexed to a processable position where the axis is in a posture orthogonal to the mounting surface and the upper surface of the table. Thus, the other end of the tube can be processed in the same manner as described above.

As described above, according to the holding jig according to the present invention, by rotating the rotation holding body by 180 ° about the rotation center axis, both ends of the L-shaped tubular body are formed by their axes as substrates. Since it is a position that takes an attitude orthogonal to the mounting surface of the above and is configured so that it can be indexed to a position that can be machined by a machine tool, the holding jig can be moved to the holding jig without replacing the L-shaped tube. Both ends of the L-shaped tube can be machined with a single installation. Therefore, even if the L-shaped tube is heavy, both ends thereof can be efficiently processed.

In the present invention, in the holding mechanism, the axis at one end of the tube is orthogonal to the mounting surface of the substrate, and the axes at both ends of the tube intersect on the axis of the rotation center axis. It is preferable that the tube is configured to hold the tube so as to be in such a posture.

According to the holding jig configured as described above, the L-shaped tube is in a posture in which the bent portion is close to the inclined surface, and the plane including the axis of the tube is orthogonal to the inclined surface. At the same time, when the rotation holding body held so that the axis of one end is orthogonal to the mounting surface is rotated by 180 ° about the rotation center axis, the other end of the tube is changed. At the processable position, the axis is indexed to a position where the axis of one end overlaps with the position where the axis was located. In other words, both ends of the tube are indexed so that their axes are coaxial at the processable position.

Thus, according to this holding jig, the base of the holding jig is attached to, for example, the spindle of a vertical or horizontal lathe in addition to the above-mentioned vertical or horizontal machining center, and its mounting surface is the spindle end surface. By attaching the L-shaped tube so as to be joined to the L-shaped tube, both ends of the L-shaped tube can be turned by the vertical or horizontal lathe.

Further, in the present invention, it is preferable that the holding mechanism includes two holding portions for holding the portions on each end side of the tubular body. By doing so, the L-shaped tube can be held in a stable state.

Further, it is preferable that the holding portion is configured to sandwich the pipe body in the radial direction. By doing so, the L-shaped tube can be held in a more stable state.

According to the holding jig according to the present invention, by rotating the rotation holding body by 180 ° about its rotation center axis, the axes of both ends of the L-shaped tubular body are orthogonal to the mounting surface of the substrate. Since it is a position to take a posture and is configured so that it can be determined to a position that can be machined by a machine tool, it can be attached to the holding jig once without replacing the L-shaped tube. , Both ends of the L-shaped tube can be machined respectively. Therefore, even if the L-shaped tube has a heavy weight, both ends thereof can be efficiently processed.

It is a perspective view which showed the holding jig which concerns on one Embodiment of this invention, (a) is the perspective view of the substrate, (b) is the perspective view of the rotation holding body. It is a front view which showed the holding jig which concerns on this embodiment. FIG. 2 is a front view showing a holding jig in a state where the rotation holding body in FIG. 2 is rotated by 180 °. It is a figure in the direction of arrow AA in FIG. 2, and is the figure which showed the holding part of the rotation holding body. It is explanatory drawing for demonstrating the holding mode of the holding part shown in FIG. It is explanatory drawing for demonstrating the holding mode of the holding part shown in FIG. It is explanatory drawing for demonstrating another embodiment of this invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the holding jig 1 of this example is a jig for holding an L-shaped tubular body W whose axis Wa is bent like a clamp at an internal angle of 90 °, and is a machine tool. A base 10 attached to the base 10, a rotation holding body 20 attached to the base 10 so as to be relatively rotatable, and a clamp mechanism 14 for fixing the rotation holding body 20 to the base 10 are provided.

The substrate 10 has an angle of 45 ° with respect to a disk-shaped mounting plate 11 having a mounting surface 11a to be mounted on the machine tool and an axis orthogonal to the mounting surface 11a (central axis of the mounting plate 11). It is composed of an inclined bracket 12 having an inclined inclined surface 12a. The inclined surface 12a has a rectangular shape, and a support shaft 13 is erected at a substantially central position thereof, and screw holes for four bolts 16 are formed around the support shaft 13. Further, screw holes for four bolts 15 and screw holes for one positioning pin 17 are bored at the edges of each long side of the inclined surface 12a. Note that FIG. 1A shows a state in which the bolts 15 and 16 and the positioning pin 17 are screwed into the screw holes. Further, in FIGS. 2 and 3, the rotation holding body 20 is indicated by a broken line. Further, in this example, the machine tool is a vertical lathe, and the substrate 10 is attached to the spindle 100 with its mounting surface 11a joined to the end surface of the spindle 100 of the lathe.

The rotation holding body 20 has a mounting plate 21 attached to the inclined surface 12a in a state of being fitted to the support shaft 13 of the inclined bracket 12, and a first holding portion provided on the mounting plate 21 at predetermined intervals. 30 and a second holding portion 50 are provided. The mounting plate 21 has a rectangular shape like the mounting plate 11 of the substrate 10, and has a bolt hole for four bolts 15 and a pin hole for one positioning pin 17 at the edge of each long side. It has been drilled. Further, a bolt hole for the bolt 16 is formed in the central portion.

Thus, the rotation holding body 20 is rotatably arranged on the inclined surface 12a of the inclined bracket 12 with the axis _ax1 of the support shaft 13 as the rotation center axis, and the positioning pin 17 is fitted into the pin hole. By screwing into the corresponding screw hole, the mounting plate 11 is positioned with respect to the inclined surface 12a of the inclined bracket 12. Then, by screwing the bolt 15 and the bolt 16 into the corresponding screw holes in this state, the mounting plate 21 is fixed to the inclined bracket 12. The bolt 15, the bolt 16, the positioning pin 17, and the corresponding screw hole constitute the clamp mechanism 14.

The first holding portion 30 and the second holding portion 50 are arranged at predetermined intervals along the longitudinal direction of the mounting plate 21 and in a state of being inclined toward the mating side (opposing side), respectively, and each end of the tubular body W. Hold the part (each side) on the part side. The first holding portion 30 and the second holding portion 50 constitute a holding mechanism 25, and have the same configuration. Therefore, in the following, the first holding unit 30 will be described as a representative, and in FIG. 4, the reference numerals of the same constituent parts of the second holding unit 50 are shown in parentheses. The figure in FIG. 4 corresponds to the view of the second holding portion 50 as viewed from the arrow B direction in FIG.

As shown in FIG. 4, the first holding portion 30 includes an upper arm 45 having an inverted U-shape of the alphabet provided above and below, and a lower arm 31 having a U-shape. Fork-shaped connecting portions 38 and 41 are fixed to the upper end surfaces of the lower arm 31 by fixing bolts 39 and 42, respectively, and the lower end portions of the upper arm 45 are inserted into these connecting portions 38 and 41, respectively. In this state, the upper arm 45 and the lower arm 31 are connected in an annular shape so as to surround the pipe body W by the connecting bolts 40 and 43. A bolt hole is drilled in one of the fork-shaped connecting portions 38 and 41, and a screw hole is drilled in the other portion at a position corresponding to the bolt hole. Further, bolt holes are formed at the lower ends of the upper arms 45 inserted into the connecting portions 38 and 41 at positions corresponding to the bolt holes and screw holes bored in the connecting portions 38 and 41, respectively. There is.

Three spike jaws 32, 33, and 34 are planted on the inner surface of the lower arm 31 so as to be able to advance and retreat in the radial direction, and the amount of advance and retreat can be adjusted by adjusting bolts 35, 36, and 37, respectively. It has become. Similarly, two spike jaws 46 and 47 are planted on the inner surface of the upper arm 45 so as to be able to advance and retreat in the radial direction, and the amount of advance and retreat can be adjusted by the adjusting bolts 48 and 49, respectively. ing. Thus, the tubular body W is radially sandwiched by these five spike jaws 32, 33, 34, 46, 47.

As shown in FIG. 4, the spike jaws 33 are arranged so as to abut on the lower end portion of the tubular body W, and the spike jaws 32 and 47 are arranged so as to face each other with the center of the tubular body W interposed therebetween. , Spike jaws 34, 46 are arranged so as to face each other with the center of the tubular body W interposed therebetween. Further, the spike jaws 32, 33, 34 are arranged at equal intervals in the circumferential direction of the tubular body W, and the spike jaws 32, 34, 46, 47 are also arranged at equal intervals in the circumferential direction of the tubular body W. Have been placed.

According to the holding jig 1 of this example having the above configuration, for example, as shown in FIG. 5, the mounting surface 11a of the mounting plate 11 is placed on a table with the mounting surface 11a facing downward. For example, one connecting bolt 43 of the first holding portion 30 is removed, the upper arm 45 is swiveled around the other connecting bolt 40 as a fulcrum, and the ring body formed by the upper arm 45 and the lower arm 31 is opened. In the same manner, as shown in FIG. 6, one connecting bolt 60 of the second holding portion 50 is removed, the upper arm 65 is swiveled around the other connecting bolt 63 as a fulcrum, and the upper arm is rotated. The ring formed by the 65 and the lower arm 51 is opened.

Next, as shown in FIG. 2, the bent portion of the tubular body W is located on the inclined bracket 12 side, and the axis Wa ₁ of one end portion W ₁ of the tubular body W is substantially equal to the central axis ax ₂ of the mounting plate 11. The tube body W is arranged so as to be coaxial and located in the lower arm 31 of the first holding portion 30 and in the lower arm 51 of the second holding portion 50.

After that, the upper arm 45 of the first holding portion 30 is swiveled toward the lower arm 31 with the other connecting bolt 40 as a fulcrum, the lower end portion thereof is inserted into the connecting portion 41, and then the connecting bolt 43 is used to connect the upper arm 45. The portion 41 and the lower end portion of the upper arm 45 are connected. Similarly, the upper arm 65 of the second holding portion 50 is swiveled toward the lower arm 51 with the other connecting bolt 63 as a fulcrum, and the lower end portion thereof is inserted into the connecting portion 58, and then the connecting bolt 60. Connects the connecting portion 58 and the lower end portion of the upper arm 65.

Next, the advancing / retreating amount of the spike jaws 32, 33, 34, 46, 47 is adjusted by the adjusting bolts 35, 36, 37, 48, 49 of the first holding portion 30, and the holding state of the pipe body W by these is adjusted. At the same time, in the same manner, the advancing / retreating amount of the spike jaws 52, 53, 54, 66, 67 is adjusted by the adjusting bolts 55, 56, 57, 68, 69 of the second holding portion 50, and the pipe body W by these is adjusted. Adjust the pinching condition.

In the holding jig 1 of this example, when the pipe body W is sandwiched between the first holding portion 30 and the second holding portion 50, the axis Wa ₁ of one end portion W ₁ of the pipe body W and the other end. The axis Wa ₂ of the portion W ₂ has a positional relationship of intersecting on the axis (rotation center axis) ax ₁ of the support shaft 13.

Next, as shown in FIG. 2, the holding jig 1 in which the tube body W is sandwiched as described above is attached to the spindle 100 of the vertical lathe. At that time, the holding jig 1 is attached to the mounting plate 11. The mounting surface 11a is mounted on the spindle 100 in a state of being mounted on the upper surface of the spindle 100, and the axis ax ₃ of the spindle 100 and the central axis ax ₂ of the mounting plate 11 are coaxial. Further, the axis Wa ₁ of one end W ₁ of the tube body W is substantially coaxial with the axis ax ₃ of the main shaft 100. Then, in this state, one end side W ₁ of the tube body W is machined by the lathe.

In this way, after processing one end side W ₁ of the tubular body W, the other end portion W ₂ of the tubular body W is then indexed to the processing position. That is, first, the bolt 15 and the bolt 16 of the holding jig 1 are pulled out from the screw holes, the positioning pin 17 is pulled out from the screw holes, and the rotation holding body 20 is attached to the axis (rotation center axis) of the support shaft 13. Make it rotatable around ax ₁ . Next, the rotation holding body 20 is rotated by 180 ° about the axis ax ₁ so that the axis Wa ₂ of the other end W ₂ of the tube body W becomes substantially coaxial with the axis ax ₃ of the main shaft 100. _The other end W2 is indexed to the machining position. Then, in this state, the other end portion W ₂ of the tubular body W is machined by the lathe.

After finishing the processing of both ends W ₁ and W ₂ of the tubular body W as described above, the holding jig 1 was removed from the spindle 100 of the vertical lathe, and the mounting surface 11a of the mounting plate 11 was turned downward. Place it on the table as appropriate in the state. Then, as described above, one connecting bolt 43 of the first holding portion 30 is removed, the upper arm 45 is swiveled around the other connecting bolt 40 as a fulcrum, and the upper arm 45 and the lower arm 31 are formed. The ring body is opened, and in the same manner, one connecting bolt 60 of the second holding portion 50 is removed, and the upper arm 65 is swiveled with the other connecting bolt 63 as a fulcrum to rotate the upper arm 65 and the upper arm 65. The ring body formed by the lower arm 51 is opened, and the processed ring body W is removed from the holding jig 1.

After that, by repeating the above-mentioned work, a new ring body W can be machined by a lathe.

As described above, according to the holding jig 1 of this example, by rotating the rotation holding body 20 by 180 ° about the rotation center axis 13, both ends W ₁ of the L-shaped tube body W are formed. , W ₂ can be indexed to a processing position where the axes Wa ₁ and Wa ₂ are coaxial with the mounting surface 11a of the base 10, that is, the axis of the spindle 100 of the lathe, so that the tube body W should be replaced. Instead, both ends W ₁ and W ₂ of the tubular body W can be machined by attaching to the holding jig 1 once. Therefore, even if the pipe body W has _a heavy weight, _both ends W1 and W2 can be efficiently processed.

Although one embodiment of the present invention has been described above, the specific embodiments that the present invention can take are not limited to those of the above examples.

For example, in the above example, the pipe body W has an example in which the bending angle (inner angle) is 90 °, but the present invention is not limited to this, and the practical range of the bending angle (inner angle) of the pipe body W is not limited to this. It is 30 ° to 150 °. This is because it is difficult to hold an object having an internal angle of less than 30 ° and an object having an internal angle of more than 150 ° due to the structure of the holding jig, and it is difficult to process the object. The more practical range of bending angle is 45 ° to 135 °, and the more practical range is 80 ° to 120 °.

In this case, where the bending angle (inner angle) of the tubular body W is θ, the inclined surface 12a of the inclined bracket 12 is (90 ° −θ /) with respect to the axis _ax2 orthogonal to the mounting surface 11a of the mounting plate 11. It needs to be tilted at the angle of 2). Since the inclined surface 12a is inclined at this angle, when the rotation holding body 20 is rotated by 180 ° about the axis ax ₁ of the support shaft 13, the other end portion W ₂ of the tubular body W becomes. The axis Wa ₂ is indexed to a machining position coaxial with the central axis of the spindle 100. As a result, both ends W ₁ and W ₂ of the tubular body W can be machined.

Further, in the above example, the holding jig 1 is attached to a vertical lathe for processing, but the processing is not limited to this, and processing can be performed using a horizontal lathe, and further. It can be processed using a horizontal or vertical machining center or the like. For example, when machining using a vertical machining center, the holding jig 1 is mounted on the table so that the mounting surface 11a of the substrate 10 is joined to the upper surface of the table. The tube body W held in 1 can be processed. Further, in the case of processing using a horizontal machining center, for example, the holding jig 1 is attached to the side surface of the ikeel fixed on the table in a state where the attachment surface 11a of the substrate 10 is joined. The tube body W held by the holding jig 1 can be processed.

When machining a tubular body W using a rotary tool in a vertical or horizontal machining center, for example, a boring tool can be used to machine the inner diameters of both ends W ₁ and W ₂ , and the end mill can be used. It is possible to perform end face machining and outer diameter machining of both ends W ₁ and W ₂ by using it, and further, it is possible to perform outer diameter machining of both ends W ₁ and W ₂ by using a tool dedicated to outer diameter machining.

Further, in the above example, after the pipe body W is attached to the holding jig 1, the holding jig 1 is attached to the machine tool, but the present invention is not limited to this mode, and the holding jig 1 is used. After attaching to the machine tool, the pipe body W may be attached to the holding jig 1.

Further, in the above example, when the pipe body W is sandwiched by the first holding portion 30 and the second holding portion 50, the axis line Wa ₁ of one end portion W ₁ of the pipe body W and the axis line of the other end portion W ₂ Wa ₂ has a positional relationship of intersecting on the axis ax ₁ of the support shaft 13, but is not limited to this. In the holding jig according to the present invention, when the bending angle (inner angle) of the L-shaped tube body W to be held is θ, the inclined surface 12a of the inclined bracket 12 is orthogonal to the mounting surface 11a of the mounting plate 11. It is important that the axis ax ₂ is tilted at an angle of (90 ° −θ / 2), and it may be configured in this way.

With this configuration, the bent portion of the tubular body W is in a posture close to the inclined surface 12a, and the plane including the axis Wa of the tubular body W is orthogonal to the inclined surface 12a, and one end portion W ₁ By holding the rotation holding body 20 on the rotation holding body 20 so that the axis Wa ₁ of the above is orthogonal to the mounting surface 11a, the rotation holding body 20 is rotated by 180 ° about the axis ax ₁ of the support shaft 13. Then, the other end portion W ₂ of the tubular body W can be indexed to a processing position where the axis Wa ₂ is orthogonal to the mounting surface 11a (see FIG. 7). Thus, with such a configuration, both end portions W ₁ and W ₂ of the tubular body W can be indexed to the processing position, and both end portions W ₁ and W ₂ can be processed.

Further, in the above example, the tube body W is held by the two holding portions of the first holding portion 30 and the second holding portion 50, but the present invention is not limited to such a configuration, and one holding portion is used. The tube body W may be held.

Again, the description of the embodiments described above is exemplary in all respects and not restrictive. Modifications and changes can be made as appropriate for those skilled in the art. The scope of the invention is indicated by the claims, not by the embodiments described above. Further, the scope of the present invention includes modifications from the embodiments within the scope of the claims and within the scope of the claims.

1 Holding jig 10 Base 11 Mounting plate 11a Mounting surface 12 Tilt bracket 12a Tilt surface 13 Support shaft 14 Clamp mechanism 20 Rotating holder 21 Mounting plate 25 Holding mechanism 30 First holding part 31 Lower arm 45 Upper arm 50 Second holding part 51 Lower arm 65 Upper arm W (L-shaped) tube

Claims (4)

It is a holding jig configured to hold an L-shaped tube whose axis is bent like a hook at an internal angle of angle θ, and to index both ends of the tube to positions where they can be processed.
It is configured to include a substrate to be attached to a machine tool, a rotation holder that is relatively rotatably mounted on the substrate, and a clamp mechanism that fixes the rotation holder to the substrate.
The substrate has a mounting surface mounted on the machine tool and an inclined surface inclined at an angle of (90 ° −θ / 2) with respect to an axis orthogonal to the mounting surface.
The rotation holder is rotatably held on the inclined surface of the substrate with an axis orthogonal to the inclined surface as a rotation center axis.
Further, in the rotation holding body, the bent portion of the tubular body is in a posture close to the inclined surface, the plane including the axis of the tubular body is orthogonal to the inclined surface, and the axial line of one end thereof is the inclined surface. It is equipped with a holding mechanism that can hold the tube so that it is in a posture orthogonal to the mounting surface.
By rotating the rotation holding body around the rotation center axis, both ends of the tube body are indexed to positions where the axes are orthogonal to the mounting surface and can be processed. An L-shaped tube holding jig characterized by being configured so that it can be used. In the holding mechanism, the axis at one end of the tube is orthogonal to the mounting surface of the substrate, and the axes at both ends of the tube intersect on the axis of the rotation center axis. The holding jig for an L-shaped tube according to claim 1, wherein the tube is configured to hold the tube. The holding jig for an L-shaped pipe according to claim 1 or 2, wherein the holding mechanism includes two holding portions for holding portions on each end side of the pipe. The holding jig for an L-shaped tube according to claim 3, wherein the holding portion is configured to sandwich the tube in the radial direction.

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