JP6897963B2 - Fixing device - Google Patents

Description

The present invention relates to a fixing device.

Patent Document 1 discloses a fixing device for fixing a piston to a spindle when machining a piston for an engine with a lathe or the like. The piston includes a tubular main body portion and a closing portion that closes one end portion thereof, and these are integrally formed. Therefore, the other end of the main body is open so as to communicate with the internal space. A pair of opposite pin holes are formed on the outer peripheral surface of the main body.

In order to fix such a piston, the device according to Patent Document 1 includes a stopper and a pair of finger jaws protruding from the stopper and inserted into the opening of the piston. The pair of finger jaws inserted into the opening are separated from each other and engage the engaging claw at the tip with the pin hole. After that, when the finger jaw is lowered, the piston is also lowered together with the finger jaw, and the piston is fixed to the stopper.

Japanese Unexamined Patent Publication No. 2011-131293

However, in the above device, the piston is fixed by the step of engaging the finger jaw with the pin hole and the step of lowering the finger jaw. Therefore, in order to fix the piston, two operations are required, and there is a problem that the control for that is complicated. It should be noted that such a problem is not limited to the piston, but includes a tubular main body portion and a closed portion that closes one end portion thereof, and a pair of pin holes are formed on the outer peripheral surface of the main body portion. It is a problem that can occur in fixing such a work in general. The present invention solves this problem, and an object of the present invention is to provide a fixing device capable of fixing a work as described above with a simple configuration and control.

The present invention has a tubular main body having first and second ends at both ends in the axial direction, and a closing portion that closes the first end of the main body, and has an outer periphery of the main body. It is a fixing device for fixing a work having a pair of through holes facing each other across the shaft on the surface, and is arranged on the base portion and the base portion, and the work is installed. A support base, an urging member that urges the support base in a direction away from the base portion, and a pair of insertion members that advance and retreat with respect to the through hole are provided, and the work is installed on the support base. When the urging member is configured so that the axis of each through hole is farther from the support base than the axis of each insertion member, and each insertion member is inserted into each through hole, the above. The support base is configured to be pressed toward the base portion so that the axis lines of the through holes and the axis lines of the insertion members coincide with each other.

According to this configuration, when the work is installed on the support base, the urging member is adjusted so that the axis of each through hole is farther from the support base than the axis of each insertion member. Then, when each insertion member is inserted into each through hole, the support base is pressed toward the base portion so that the axis of each through hole and the axis of each insertion member coincide with each other. Therefore, since the control for fixing the work is only to insert the insertion member into the through hole, the work can be fixed with a simple configuration and control.

In the fixing device, a protruding member that protrudes from the base portion and can be inserted into the internal space of the work from the second end side can be further provided with respect to the work installed on the support base. ..

In the fixing device, each inserting member inserted into the through hole can be configured to engage with the protruding member.

In each of the fixing devices, a diameter-expanding member that is attached to the outer peripheral surface of each of the insertion members and expands in diameter so as to press the inner wall surface of each of the through holes when each of the insertion members engages with the projecting member. You can prepare further.

In each of the fixing devices, the work has a through hole formed therein, and a pair of thick portions protruding from the inner wall surface of the work to the internal space are formed, and the protruding member has the pair of thicknesses. It can be configured to be inserted between the meat parts.

In each of the fixing devices, a pair of slide members that support the insertion members and are movable on the base portion in the first direction in which the insertion members move, and in the second direction in which the protrusion member extends. A movable member that can move forward and backward, and a conversion mechanism that converts the movement of the movable member in the second direction into the movement of each slide member in the first direction can be further provided.

In each of the fixing devices, the base portion can be configured to be rotatable around the axis of the work.

According to the present invention, a work such as a piston can be fixed with a simple configuration and control.

It is a perspective view which shows an example of the piston fixed to the fixing device which concerns on this invention. It is sectional drawing of FIG. It is a cross-sectional view of FIG. 1 and is a cross-sectional view deviated from FIG. 2 by 90 degrees. It is a front view which shows the schematic structure of one Embodiment of the fixing device of this invention. It is sectional drawing seen from the front which shows the upper part of the spindle unit in the fixing device of FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a partial cross-sectional view of the upper part of the spindle unit as viewed from the side surface. It is sectional drawing which shows the operation of the insertion tool in FIG. It is sectional drawing which shows the operation of the fixing device when a work is installed. 9 is a cross-sectional view taken along the line BB of FIG. FIG. 9 is an enlarged cross-sectional view of FIG. It is sectional drawing which shows the operation of the insertion tool in FIG. It is sectional drawing which shows the other example of the insertion member.

Hereinafter, an embodiment in which the fixing device according to the present invention is applied to a fixing device for fixing a piston for an engine will be described with reference to the drawings. The piston fixed to the fixing device is processed, for example, by a processing device (not shown) whose outer peripheral surface or the like is processed. Therefore, this fixing device is configured at the tip of the spindle so as to rotate the fixed piston.

First, the piston (work) to be machined will be described with reference to FIGS. 1 to 3. 1 is a side view of the piston, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a cross-sectional view of FIG. 1, which is 90 degrees away from FIG.

As shown in FIGS. 1 to 3, the work 1 includes a tubular main body portion 11 and a columnar closing portion 12 that closes one opening in the axial direction of the main body portion 11. Are integrally formed. The opening 13 on the main body 11 opposite to the closed portion 12 is open to the outside.

The main body 11 is formed by a pair of first wall surfaces 111 extending in the longitudinal direction and a pair of second wall surfaces 112 extending in the lateral direction in a rectangular cross section. The outer surface of the second wall surface 112 is formed in an arc shape and is formed so as to be continuous with the outer peripheral surface of the closed portion 12. Further, since the second wall surface 112 is shorter than the outer diameter of the closing portion 12, as shown in FIGS. 1 and 2, there is a step 119 between the outer peripheral surface of the closing member and the first wall surface 111. Is formed.

On the other hand, a pair of pin holes 113 having a circular cross section are formed on the first wall surface 111 at positions sandwiching the axis (axis center) of the main body portion 11, and each pin hole 113 is the first of the main body portion 11. It is formed so as to penetrate the wall surface 111. Further, in each first wall surface 111, the portion where the pin hole 113 is formed constitutes a thick portion 114 that protrudes into the internal space. The surfaces of the thick portions 114 facing the internal space side face each other, and an insertion space 115 for inserting the projecting member 71, which will be described later, from the opening 13 is formed between the facing surfaces. Has been done. Further, in the closed portion 12, a recess 116 extending in the radial direction (direction orthogonal to the paper surface of FIG. 2) orthogonal to the pin hole 113 is formed at a position corresponding to the insertion space 115, and the recess 116 is formed. , The upper end of the protruding member 71, which will be described later, is engaged.

The recess 116 is formed so as to extend substantially parallel to the first wall surface 111 and substantially the entire radial direction of the closing portion 12. This direction is the longitudinal direction of the recess 116. However, as shown in FIG. 3, the longitudinal direction of the recess 116 is shorter than the length between the second wall surfaces 112 of the main body 11. Therefore, a step portion 117 is formed between both ends of the recess 116 in the longitudinal direction and the second wall surface 112 of the main body portion 11. This step portion 117 is adapted to engage with the projecting member 71 described later, and will be hereinafter referred to as an engaging step portion 117. Further, a notch 118 is formed at the lower end of the inner wall surface of the second wall surface 112, and the notch 118 engages with the edge portion of the support base 72 described later.

Next, a fixing device for fixing the work 1 will be described with reference to FIG. FIG. 4 is a front view showing a schematic configuration of the fixing device. As shown in FIG. 4, this fixing device includes a spindle unit 2 that rotatably supports the work 1 and a cylinder unit 3 arranged below the spindle unit 2. The spindle unit 2 includes a spindle motor 4 and a base portion 5 supported above the motor 4. The rotation axis of the motor 4 extends in the vertical direction, and the base portion 5 rotates about the rotation axis at the upper end portion thereof. Further, a support base 72 is attached to the upper end portion of the base portion 5 as described later, and the work 1 is supported by the support base 72.

The cylinder unit 3 includes a hydraulic cylinder 21 and a push-pull rod 22 that can move forward and backward in the vertical direction by the hydraulic cylinder 21. Then, the push-pull rod 22 extends upward from the hydraulic cylinder 21, penetrates the motor 4 of the spindle unit 2, and extends to the inside of the base portion 5.

Next, the spindle unit 2 will be described in more detail with reference to FIGS. 5 to 7. 5 is a front sectional view showing the upper part of the spindle unit, FIG. 6 is a sectional view taken along line AA of FIG. 5, and FIG. 7 is a partial sectional view of the upper portion of the spindle unit as viewed from the side surface. Hereinafter, the left-right direction of FIG. 5 is referred to as left-right, the left-right direction of FIG. 6 (paper direction of FIG. 5) is referred to as front-back, and in each drawing, description will be given based on these directions.

First, the base portion 5 will be described. As shown in FIGS. 5 to 7, a pair of semi-cylindrical blocks 6 are fixed to the upper portion of the base portion 5 with a gap. A plate-shaped closing member 7 having a rectangular shape in a plan view is attached to the upper surface of the central portion of both blocks 6 so as to cover the gaps between the blocks 6. A pair of inserters 8 are arranged in the gap between the two blocks 6 so as to sandwich the closing member 7, and are supported so as to be movable in the left-right direction along the gap. Further, a conversion mechanism 9 for moving the inserter 8 is arranged in the gap between the two blocks 6, and the push-pull rod 22 described above is connected to the conversion mechanism 9. Further, the closing member 7 is provided with a projecting member 71 and a support base 72 for supporting the work 1. Hereinafter, these members will be described in detail.

On the lower surface of the closing member 7, a rectangular parallelepiped recess 701 is formed at a position corresponding to the gap between both blocks 6. The recess 701 is formed slightly wider than the width of the gap. On the other hand, the above-mentioned protruding member 71 is attached to the upper surface of the closing member 7. The projecting member 71 includes a columnar fixing portion 711 and a supporting portion 712 attached to the upper end of the fixing portion 711 to support the work 1. The support portion 712 is formed in a rectangular parallelepiped shape with the paper surface direction of FIG. 5 as the longitudinal direction. Hereinafter, among the four side surfaces of the support portion 712, a pair of side surfaces extending in the longitudinal direction will be referred to as a first side surface 713, and a pair of side surfaces extending in the lateral direction will be referred to as a second side surface 714. Then, as shown in FIG. 6, on the upper surface of the support portion 712, inclined surfaces 715 extending in the longitudinal direction and inclined downward toward both second side surfaces 714 are formed at both ends in the longitudinal direction. Further, conical recesses 716 are symmetrically formed in the vicinity of the center of both first side surfaces 713 of the support portion 712. Then, as shown in FIG. 11, which will be described later, the axis that passes through both recesses 716 and extends in the horizontal direction is defined as X2.

Further, the support base 72 described above is attached to the upper surface of the closing member 7. The support base 72 is formed in a disk shape, and a through hole 721 is formed in the center thereof. Then, the fixing portion 711 of the above-mentioned protruding member 71 protrudes from the through hole 721. Further, a plurality of convex portions 702 are formed on the upper surface of the closing member 7, and recesses for receiving these convex portions 702 are formed on the lower surface of the support base 72. Therefore, the support base 72 is positioned in the horizontal direction by the convex portion 702 of the closing member 7, and is guided so as to be movable in the vertical direction. Further, a plurality of springs 73 are arranged between the closing member 7 and the support base 72, and the support base 72 is urged upward from the closing member 7 and floats. Here, the positions of FIGS. 5 to 7 in which the work 1 is not arranged on the support base 72 and the support base 72 is urged upward by the spring 73 are referred to as initial positions. On the other hand, as shown in FIGS. 9 to 11 described later, a position where the work 1 is arranged on the support base 72 and the support base 72 is pushed down against the spring 73 by the weight of the work 1 is referred to as an installation position. And. Then, the position where the work 1 is further pushed down from this state and is in the fixed state is referred to as a fixed position. The urging force of the spring 73 is determined so that the support base 72 continues to float even if the support base 72 changes to any of these three positions, that is, the initial position, the installation position, and the fixed position. ..

Next, the inserter 8 will be described. As shown in FIGS. 5 and 7, each insertion tool 8 includes a slide member 81 that slides in the left-right direction in a gap between the blocks 6, and an insertion member 82 that is supported by an upper end portion of the slide member 81. ing. Each slide member 81 includes a rectangular parallelepiped main body portion 811 and a protruding portion 812 protruding from the upper end of the main body portion 811. As shown in FIG. 7, a part of the main body 811 is arranged in the gap between both blocks 6, and the other part projects upward from the block 6. At the lower end of the main body 811, engaging portions 813 projecting in the front-rear direction are formed, and these engaging portions 813 project from the first protrusion 61 so as to face each other near the upper end of each block 6. Engages with the underside of. On the other hand, an insertion plate 814 protruding toward the closing member 7 is attached near the middle of the main body 811 in the vertical direction. The insertion plate 814 is adapted to be inserted into the gap between the recess 701 of the closing member 7 and the upper surface of the block 6 while sliding the upper surfaces of both blocks 6. Therefore, the engaging portion 813 and the insertion plate 814 of the main body portion 811 serve as a guide for the slide member 81 to move in the left-right direction. Further, a recess 815 is formed on the lower surface of the main body 811 so that a rotating member 92, which will be described later, is engaged with the concave portion 815.

The protruding portion 812 of the slide member 81 projects upward from the end portion of the main body portion 811 on the closing member 7 side, and the above-mentioned insertion member 82 is attached to the upper end thereof. As shown in FIG. 11, the insertion member 82 includes a shaft portion 821 formed in a cylindrical shape, a cylindrical movable portion 823 attached to the tip of the shaft portion 821 via a spring 822, and a shaft portion. The 821 and the diameter-expanding member 824 formed in a cylindrical shape so as to cover the outer peripheral surface of the movable portion 823 are provided.

Both shafts 821 are arranged so that their axes face in the left-right direction, and the shafts X2 of the recess 716 of the protruding member 71 described above coincide with the axes of both shafts 821. The height of 821 in the vertical direction is determined. The movable portion 823 is formed in a disk shape and is coaxially arranged on the tip end side of the shaft portion 821, and is urged toward the projecting member 71 side by the spring 822 as described above. However, since the stopper 825 that engages inside the shaft portion 821 is attached to the rear end surface of the movable portion 823, the length of the stopper 825 that is urged by the spring 822 to be separated from the shaft portion 821 is determined. On the other hand, a conical protrusion 826 is provided on the tip surface of the movable portion 823, that is, the surface facing the protruding member 71, and the protrusion 826 matches the recess 716 of the protruding member 71, as will be described later. It is designed to do.

Further, the outer peripheral surface of the tip portion of the shaft portion 821 is formed in a tapered shape whose diameter decreases toward the tip portion. On the other hand, the outer peripheral surface of the movable portion 823 is formed so that the diameter becomes smaller toward the rear end side. Therefore, a groove having a trapezoidal cross section is formed between the tip end portion of the shaft portion 821 and the rear end portion of the movable portion 823. A cylindrical diameter-expanding member 824 is arranged so as to cover the groove. The diameter-expanding member 824 is called a collet, and its inner wall surface is formed in a cross-sectional shape that engages with a groove. Further, the diameter-expanding member 824 has a plurality of slits (not shown) formed on the surface thereof so that the diameter can be expanded in the radial direction, and the movable portion 823 is pressed toward the shaft portion 821 side against the spring 822. Then, the axial length of the groove is shortened, so that the diameter-expanding member 824 is pressed outward in the radial direction. As a result, the diameter-expanding member 824 is expanded in diameter.

Further, the outer diameter of the diameter-expanding member 824 in the initial state is slightly smaller than the inner diameter of the pin hole 113 of the work 1. However, the outer diameter when the diameter-expanding member 824 is expanded is slightly larger than the inner diameter of the pin hole 113.

Next, the conversion mechanism 9 for moving the inserter 8 will be described. The conversion mechanism 9 is composed of an engaging member 91 attached to the tip of the push-pull rod 22 and a pair of rotating members 92 arranged on both sides of the engaging member 91 and below the slide member 81. .. The engaging member 91 is arranged in a gap between both blocks 6, and recesses 911 are formed on both sides in the left-right direction. Further, a protrusion 912 is provided at the upper end of the engaging member 91, and the protrusion 912 is between the second protrusions 65 provided below the first protrusion 61 of both blocks 6. It is designed to be inserted. Further, the upper surface of the engaging member 91 is in contact with the second protrusion 95, so that the engaging member 91 cannot be pushed up any further.

Each rotating member 92 is formed in a flat plate shape, and is rotatably supported around a shaft member 93 extending so as to connect the gaps between the two blocks 6. A first engaging protrusion 921 is formed on the surface facing the engaging member 91, and is movably fitted in the recess 911 of the engaging member 91. Further, a second engaging protrusion 922 is formed on the surface of each rotating member 92 facing the slide member 81, and is movably fitted in the recess 815 on the lower surface of the slide member 81.

The first engaging protrusion 921 and the second engaging protrusion 922 are arranged around the shaft member 93 at an angle of about 90 degrees. Then, for example, when the engaging member 91 is pulled by the push-pull rod 22 from the state of FIG. 5 and moves downward, the first engaging protrusion 921 is pulled downward as shown in FIG. 8, thereby causing the rotating member. 92 rotates around the shaft member 93. Along with this rotation, the second engaging protrusion 922 rotates toward the closing member 7. As a result, the inserter 8 that engages with the second engaging protrusion 922 slides toward the closing member 7. At this time, both the insertion tools 8 move so as to be close to each other at the same time, and the insertion member 82 engages with the recess 716 of the protrusion member 71.

On the other hand, when the push-pull rod 22 is pushed upward, the engaging member 91 is also pushed upward. As a result, as shown in FIG. 5, the first engaging protrusion 921 of each rotating member 92 is also pushed upward, and the rotating member 92 rotates. Along with this rotation, the second engaging protrusion 922 moves in a direction away from the closing member 7, whereby the inserter 8 slides in a direction away from the protruding member 71. As a result, the engagement state between the insertion member 82 of both insertion tools 8 and the projecting member 71 is released, and both insertion members 82 move so as to be separated from each other.

Next, the operation of attaching the work 1 to the fixing device configured as described above will be described with reference to FIGS. 9 to 12. First, the work 1 is arranged on the support base 72 by a robot arm (not shown) or the like so that the opening of the work 1 faces downward. At this time, the work 1 is arranged on the support base 72 with the pin holes 113 facing the insertion members 82. Therefore, as shown in FIG. 9, the projecting member 71 is arranged inside the work 1 between the thick portions 114, and as shown in FIG. 10, the inclined surface 715 on the upper surface of the projecting member 71 is inside the work. Contact the engaging step portion 117 of. Further, the opening edge portion of the work 1, that is, the notch 118 at the lower end portion of the main body portion 11, engages with the peripheral edge of the support base 72. In this way, the work 1 is supported on the support base 72.

At this time, the support base 72 is pushed down from the initial position to the installation position by the weight of the work 1, but as shown in FIG. 11, when the support base 72 is in the installation position, the axis X1 of the pin hole 113 of the work 1 Is adjusted so that the spring 73 that supports the support base 72 is located at a position slightly higher (for example, about 1 mm) than the axis X2 of the insertion member 82 by a distance h.

Then, when the hydraulic cylinder 21 is driven and the push-pull rod 22 is moved downward from the states of FIGS. 9 and 10, the engaging member 91 moves downward. As a result, the rotating member 92 rotates, and as shown in FIG. 12, the inserters 8 move in directions close to each other. As a result, the insertion member 82 is inserted into the pin hole 113 of the work 1. As described above, since the axis X2 of the insertion member 82 is located at a position slightly lower than the axis X1 of the pin hole X1, the axis X2 and the pin hole 113 of the insertion member 82 can be inserted into the pin hole 113 of the insertion member 82. The work 1 is pushed downward so as to coincide with the axis X1 of. That is, the support base 72 is pushed downward against the spring 73 together with the work 1 by the distance h shown in FIG. The position of the support base 72 at this time is the fixed position described above, and the floating state of the support base 72 continues as described above.

Then, when the movable portion 823 of the insertion member 82 engages with the recess 716 of the protruding member 71, the movable portion 823 is pressed against the shaft portion 821, whereby the diameter-expanding member 824 is expanded in diameter. As a result, the diameter-expanding member 824 is in close contact with the inner wall surface of the pin hole 113, and the insertion member 82 is fixed to the pin hole 113. In this state, the work 1 is firmly fixed to the fixing device by the insertion member 82 and the support base 72.

Subsequently, the spindle motor 4 is driven to rotate the base portion 5. As a result, the outer peripheral surface of the work 1 such as the closed portion 12 is processed by a processing tool (not shown). In addition to this, necessary processing such as forming a hole in the work is performed. Then, when the processing is completed, the hydraulic cylinder 21 is driven to push up the push-pull rod 22 upward. Along with this, the engaging member 91 rotates the rotating member 92, and as shown in FIG. 9, both inserters 8 move in a direction in which they are separated from each other. As a result, the insertion member 82 is separated from the projecting member 71, so that the pressure on the movable portion 823 of the insertion member 82 is released. As a result, the diameter-expanding member 824 is reduced in diameter, and the state of close contact between the diameter-expanding member 824 and the inner wall surface of the pin hole 113 is also released. Then, when the insertion member 82 is separated from the pin hole 113, the insertion member 82 releases the downward push-down of the work 1. As a result, the support base 72 is urged by the spring 73, and the work 1 is slightly raised to the initial position. In this state, the robot arm is driven to discharge the processed work 1 on the support base 72. After that, the next raw work 1 is arranged on the support base 72 by the robot arm.

As described above, according to the present embodiment, when the work 1 is installed on the support base 72, the spring 73 is such that the axis of each pin hole 113 is separated from the support base 72 by the axis of each insertion member 82. Has been adjusted. Then, when each insertion member 82 is inserted into each pin hole 113, the support base 72 is pressed toward the base portion 5 so that the axis of each pin hole 113 and the axis of each insertion member 82 coincide with each other. It is configured in. Therefore, since the insertion member 82 is only inserted into the pin hole 113 as the control for fixing the work, the work can be fixed by simple control.

Since the fixing device includes a protruding member 71 that is inserted from the opening 13 of the work 1, when the work 1 is installed on the support base 72, the work 1 is supported by the support base before the work 1 is fixed. It can be stably held on 72. Then, the insertion member 782 inserted into the pin hole 113 engages with the projecting member 71. That is, since the insertion member 82 and the projecting member 71 are connected, the work 1 can be firmly fixed from both the outside and the inside thereof.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the above embodiment, the diameter-expanding member 824 for bringing the insertion member 82 into close contact with the inner wall surface of the pin hole 113 is used, but other configurations may be used. For example, the insertion member 85 of FIG. 13 is formed with an oil passage 851 that connects the tip end thereof and the outer peripheral surface thereof, and oil is sealed inside the oil passage 851. Further, a deformable cylindrical diameter-expanding member 852 is provided on the outer peripheral surface of the insertion member 85. Then, the movable portion 853 provided at the tip of the insertion member 85 is configured to advance and retreat with respect to the insertion member 85, and when the movable portion 853 is pressed by the protruding member 71, the oil in the oil passage 851 is pressed. As a result, the oil presses the diameter-expanding member 852 outward in the radial direction, and the diameter-expanding member 852 and the inner wall surface of the pin hole 113 are brought into close contact with each other. However, this configuration is also an example, and other configurations may be adopted.

In the above embodiment, the insertion member 82 is engaged with the projecting member 71, or the diameter-expanding members 824 and 852 are attached to the insertion member 82 so as to be brought into close contact with the inner wall surface of the pin hole 113, but these are not essential. .. That is, if the insertion member 82 is configured so that the work 1 can be pressed so that the support base 72 is further pushed down from the installation position to the fixed position when the insertion members 82 and 85 are inserted into the pin holes 113. Good.

Further, when the work 1 is installed on the support base 72 by the projecting member 71, the work 1 can be stably held on the support base 72 until the work 1 is fixed. However, from the viewpoint of fixing the work, the shape of the projecting member 71 is not particularly limited, and the projecting member 71 may not be provided. Alternatively, instead of the projecting member 71, a mechanism for holding the work 1 may be provided on the support base 72.

The mechanism for moving the inserter is not particularly limited. In the above embodiment, the advance / retreat of the push-pull rod by the hydraulic cylinder is converted by the conversion mechanism to move the insertion tool, but other driving means may be used so that both insertion members can be separated from each other.

In the above embodiment, a motor is provided in the fixing device, and the base portion is rotatably configured. However, a mechanism for rotation is not always necessary, and the fixing device of the present invention simply uses a piston as described above. It may be fixed.

In the above embodiment, the piston is targeted for machining, but the present invention is not limited to this. That is, it has a tubular main body portion having a first end portion and a second end portion at both ends in the axial direction, and a closing portion that closes the first end portion of the main body portion, and the outer peripheral surface of the main body portion is the said. A work having a pair of through holes facing each other across a shaft is a target for fixing by the fixing device according to the present invention.

1: Work 11: Main body 12: Closed 113: Pin hole (through hole)
114: Thick part 22: Push-pull rod (movable member)
5: Base 9: Conversion mechanism 71: Protruding member 72: Support 73: Spring (biasing member)
81: Slide member 82: Insertion member 721: Through hole 824: Diameter expansion member

Claims (7)

It has a tubular main body having first and second ends at both ends in the axial direction, and a closing portion that closes the first end of the main body, and the shaft is on the outer peripheral surface of the main body. It is a fixing device for fixing a work in which a pair of through holes facing each other are formed.
Base and
A support base that is placed on the base and on which the work is installed,
An urging member that urges the support base in a direction away from the base portion,
A pair of insertion members that advance and retreat with respect to the through hole,
With
When the work is installed on the support, the urging member is configured so that the axis of each through hole is farther from the support than the axis of each insertion member.
When inserting the respective insertion member into the respective through holes, as before Symbol the axis of the respective insert member with the axis of the through-holes coincide, so that the support base is pressed against the base portion A fixed device that is configured. The first aspect of the present invention, wherein the work projecting from the base portion and being installed on the support base is further provided with a projecting member that can be inserted from the second end side into the internal space of the work. Fixing device. The fixing device according to claim 2, wherein each inserting member inserted into the through hole is configured to engage with the protruding member. A claim that further comprises a diameter-expanding member that is attached to the outer peripheral surface of each of the insertion members and expands in diameter so as to press the inner wall surface of each of the through holes when each of the insertion members engages with the projecting member. 3. The fixing device according to 3. The work has a through hole formed therein, and a pair of thick-walled portions projecting from the inner wall surface of the work to the internal space are formed.
The fixing device according to any one of claims 2 to 4, wherein the protruding member is configured to be inserted between the pair of thick portions. A pair of slide members that support each of the insertion members and are movable on the base portion in the first direction in which the insertion members move.
A movable member that can move forward and backward in the second direction in which the protruding member extends,
A conversion mechanism that converts the movement of the movable member in the second direction into the movement of each slide member in the first direction, and
The fixing device according to any one of claims 2 to 5, further comprising. The fixing device according to any one of claims 1 to 5, wherein the base portion is configured to be rotatable around the axis of the work.

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