JP7193834B2 - Work jig and work support system provided with the same - Google Patents

Description

The present invention relates to a work jig and a work support system having the same.

When finishing the surface of the teeth of a gear-cut work, after the work (the gear to be machined) is attached to the spindle unit, the gear-shaped tool is meshed with the work, and the work is machined while the two are driven synchronously. There is a device (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2009-12175

By the way, in order to properly mesh the work with the tool, the work must be correctly attached to the work jig, and the work jig must be properly attached to the spindle unit. However, conventionally, there was a problem that the work efficiency was low because the worker had to check whether the work and the work jig were properly attached each time. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a work jig and a work support system provided with the same that can efficiently confirm at least whether or not a work is attached at a correct position. intended to provide

The present invention provides a work jig that detachably fixes a work W and is detachably supported by a work support unit, the jig main body having a columnar mounting portion at the tip, and the work W so as to be able to be inserted into the through-hole of the mounting portion, and arranged to cover the mounting portion, the diameter of which decreases when moving toward the distal end side of the mounting portion in the axial direction, and increases when moving toward the rear end side in the axial direction. A fixing member whose diameter can be expanded and contracted is inserted through the inside of the jig body in the axial direction, and between a release position where the fixing member is arranged on the front end side and a fixing position where the fixing member is arranged on the rear end side. a first moving member that is axially movable; and a first spring member that biases the moving member toward the fixed position, wherein the first moving member is formed with the first flow path, The jig body has a first seating surface for the workpiece W when the workpiece W is attached to the fixing member, a first opening capable of ejecting air from the first seating surface, the first opening, and and a second flow path communicating with the first flow path is formed so that the first moving member is pressed from the fixed position to the release position by a first pressing member provided in the work supporting unit. When the first moving member is in the fixed position, the first pressing member is in contact with the first moving member, and the air jetting port provided in the first pressing member blows the first moving member. Air can be ejected from the opening via the first flow path and the second flow path.

A work support system according to the present invention includes the above-described work jig and a work support unit that detachably supports the work jig, wherein the work support unit is a first support that supports the work jig. and a first pressing member attached to the first supporting body and capable of pressing the first moving member from the rear end side in the axial direction toward the release position, wherein the first pressing member When the first moving member is at the fixed position, it is capable of maintaining contact with the first moving member, and has an injection port capable of injecting air into the second flow path of the first moving member, The first pressing member has a pressing position for pressing the moving member against the first spring member so as to move the first moving member to the release position, and a pressing position for moving the first moving member to the fixing position. It is movably supported in the axial direction so as to be able to take a contact position in which it contacts the first moving member and a retracted position away from the first moving member in a moved state.

In the above work support system, the first pressing member includes a first pressing body movable in the axial direction, and a first pressing member having an urging force weaker than that of the first spring member at the tip portion in the axial direction of the first pressing body. a first movable portion attached via two spring members and formed with the injection port, wherein when the first pressing member is at the contact position, the first pressing member moves to the second spring member; can be configured to press the first movable portion against the first moving member.

The work support system further includes a spindle unit for detachably attaching the work jig, the spindle unit supporting the work jig and having a second seating surface on which the work jig is seated. 2 a support body, a housing that supports the second support body rotatably around the axial direction, a fixing mechanism that is attached to the second support body and detachably fixes the work jig, a second pressing member attached to the housing, wherein the fixing mechanism is pressed by the second pressing member to move to a release position, and when the pressing by the second pressing member is released, a second moving member that moves to a fixed position; a third spring member that biases the second moving member toward the fixed position; and fixing the work jig when the second moving member is at the release position. and a fixture configured to fix the work jig when the second moving member is at the fixed position; and a third flow path provided in the second moving member through which air flows. and the second support body includes a fourth flow path communicating with the third flow path, and a second opening formed in the second seating surface to which the fourth flow path is connected. and the second pressing member is capable of maintaining contact with the second moving member when the second moving member is at the fixed position, and injects air into a third flow path of the second moving member. wherein said second pressing member is in a pressing position for pressing said second moving member against said third spring member so as to move said second moving member to said release position. and, with the second moving member moved to the fixed position, move in the axial direction so as to take a contact position where the second moving member contacts the second moving member and a retracted position spaced apart from the second moving member. It can be supported as possible.

In the above work support system, the second pressing member includes a second pressing body movable in the axial direction, and a second pressing member having a biasing force weaker than that of the third spring member, which is attached to the tip portion of the second pressing body in the axial direction. 4 a second movable portion attached via a spring member and formed with the injection port, wherein when the second pressing member is at the contact position, the second pressing member moves the fourth spring member; can be configured to press the second movable portion against the second moving member.

In the above work support system, a transport unit transports the work jig between the work support unit and the spindle unit, and a work attached to the work jig supported by the spindle unit is processed. and a tool unit.

According to the present invention, it is possible to efficiently confirm at least whether or not the workpiece is attached at the correct position.

1 is a front view showing an example in which a work support system according to the present invention is applied to a gear machining system; FIG. 2 is a partial side view of FIG. 1 including the interior of the base; FIG. FIG. 4 is a cross-sectional view of an arbor supporting a work; 4 is a cross-sectional view of the work support unit; FIG. 4 is a cross-sectional view of the work support unit; FIG. 4 is a cross-sectional view of the work support unit; FIG. 4 is a cross-sectional view of the work support unit; FIG. 4 is a cross-sectional view of the spindle unit; FIG. 4 is a cross-sectional view of the spindle unit; FIG. 4 is a cross-sectional view of the spindle unit; FIG.

An embodiment in which a work support system according to the present invention is applied to a gear machining system will be described below with reference to the drawings. FIG. 1 is a front view of the gear machining system according to this embodiment, and FIG. 2 is a partial side view of FIG. 1 including the inside of the base portion.

As shown in FIGS. 1 and 2, this gear machining system grinds a workpiece W, which is a gear to be machined, while synchronously rotating it with a grindstone 23, which is a tool. This system comprises a work support unit 1 for setting a work W, a tool unit 2 having a grindstone 23 for processing the work W, a spindle unit 3 for synchronously rotating the work with respect to the grindstone 23, and a work support unit 1. A transfer unit 4 for transferring the work W set to the spindle unit 3 to the spindle unit 3 is provided, and a base portion 6 for supporting them is provided. The work W is mainly supported by a work jig called an arbor 5 and transferred from the work support unit 1 to the spindle unit 3 by the transfer unit 4 while being supported by the arbor 5 . Each unit will be described in detail below.

<1. Arbor>
First, the work W and the arbor 5 supporting the work W will be described with reference to FIG. FIG. 3 is a cross-sectional view of the arbor 5 supporting the work W. As shown in FIG. As shown in the figure, the work W is a gear with a through hole formed in the center, and the arbor 5 is a member that supports the work W. As shown in FIG. The arbor 5 includes a truncated conical lower base portion 511, a columnar center portion 512 provided at the upper end of the lower base portion 511, and a distal end provided at the upper end of the central portion 512 and having a tapered outer peripheral surface. An arbor body (jig body) 51 integrally formed with a portion (mounting portion) 513 is provided. Since the outer diameters of the tip portion and the central portion are different, a step is formed, and a seating surface (first seating surface) 594 on which a workpiece is placed is formed on the step, that is, the upper surface of the central portion 512 . ing.

A support portion 58 is attached to the lower end portion of the arbor body 51 . The support portion 58 includes a disc-shaped flange portion 581 extending radially outward from the lower base portion 511 and a cylindrical fixing portion 582 extending downward from the lower end of the flange portion 581 and having a smaller diameter than the flange portion 581 . are integrally formed. Further, the support portion 58 is formed with a through hole 583 that penetrates the flange portion 581 and the fixed portion and communicates with the through hole 57 of the arbor body 51 described below.

An annular groove 516 is formed above the flange portion 581 on the outer peripheral surface of the lower base portion 511 of the arbor body 51 so as to be clamped by the clamping arm 44 to be described later. A through hole 57 extending in the axial direction is formed inside the arbor body 51 . The through hole 57 has a first portion 571 extending from the lower base portion 511 to the vicinity of the upper end of the central portion 512, and the diameter of the first portion 571 decreases from the upper end of the first portion 571 and extends to open toward the upper end of the tip portion 513. A second part 572 is provided. A moving member (first moving member) 52 is inserted through the through hole 57 . The moving member 52 includes a rod-shaped main body portion 521 inserted through the second portion 572 of the through hole 57, a cylindrical cap portion 522 attached to the portion of the main body portion 521 protruding from the upper end of the distal end portion 513, and a main body. A columnar pressing portion 523 is provided at the lower end of the portion 521 and positioned at the first portion 571 of the through hole 57 . The diameters of the cap portion 522 and the pressing portion 523 are larger than that of the main body portion 521 . In addition, a plurality of coned disc springs ( A first spring member) 53 is arranged. Therefore, the spring 53 always acts to urge the pressing portion 523 downward. Further, a contact portion 524 is provided on the lower side of the cap portion 522 of the moving member 52 to contact the opening peripheral edge of the tip portion 513 of the arbor body 51 , and the contact portion 524 contacts the tip portion 513 . Therefore, the moving member 52 is prevented from slipping out of the arbor body 51. - 特許庁

A cylindrical collet chuck (fixing member) 55 is provided below the cap portion 522 . The outer peripheral surface of the collet chuck 55 is parallel to the axis of the arbor body 51, and the workpiece W is fitted therein. On the other hand, the inner wall surface of the collet chuck 55 is formed in a tapered shape that spreads toward the bottom so as to correspond to the taper of the tip portion 513 of the arbor body 51 . Further, the contact portion 524 described above is engaged with the inner wall surface of the collet chuck 55 . Normally, the collet chuck 55 is pressed downward by the cap portion 522 due to the force of the spring 53 . Therefore, the collet chuck 55 expands radially outward while being pressed downward along the taper of the distal end portion 513 . As a result, the workpiece W fitted in the collet chuck 55 receives radially outward force from the inside, and as a result, is fixed to the collet chuck 55 . On the other hand, when the moving member 52 is pressed from below against the spring 53 , the cap portion 522 is pushed upward together with the contact portion 524 , so the collet chuck 55 is pushed up by the contact portion 524 . As a result, the collet chuck 55 moves upward along the taper and becomes smaller in diameter. As a result, the work W can be removed from the collet chuck 55 because the force of the collet chuck 55 that presses the work W does not act. Hereinafter, the position of the moving member 52 when the moving member 52 is pushed down by the spring 53 and the workpiece W is fixed to the collet chuck 55 is referred to as a fixed position. On the other hand, the position of the moving member 52 when the moving member 52 is pushed up and the workpiece W can be removed from the collet chuck 55 is called the release position.

As will be described later, the first pressing member 12 that pushes up the moving member 52 from below passes through the through hole 583 of the supporting portion and is inserted into the through hole 57 of the arbor body 51 .

Further, inside the moving member 52, a first flow path 591 extending in the axial direction is formed through which air flows. A second flow path 592 is formed in the central portion 512 of the arbor body 51 so as to communicate with the first flow path 591 . This second flow path 592 is connected to an opening 593 formed in an annular seating surface 594 on the upper surface of the central portion 512 described above. Therefore, the air supplied from the first flow path 591 is jetted from the opening 593 after passing through the second flow path 592 . A plurality of second flow paths 592 and openings 593 can be provided so as to correspond to the seating surfaces 594 .

<2. Work support unit>
Next, the work support unit 1 will be described with reference to FIGS. 4 to 7 as well. 4 is a cross-sectional view of the work support unit, and FIGS. 5 to 7 are cross-sectional views of the work support unit showing the state in which the arbor is attached.

As shown in FIGS. 4 and 5, the work support unit 1 includes a cylindrical support body (first support body) 11 which is supported by the base portion 6 and whose axis extends in the vertical direction. The support body 11 extends so as to slightly protrude upward from the base portion 6, and has a vertically extending through hole 111 formed therein. The first pressing member 12 inserted into the through holes 583 and 57 of the arbor 5 is accommodated in the through hole 111 and supported so as to be vertically movable. Two large-diameter portions are formed in the middle of the through-hole 111 . The first large-diameter portion 13 on the upper side opens upward from the upper end portion of the support body 11 so that the fixing portion 5822 of the arbor 5 is fitted therein. The second large-diameter portion 14 on the lower side constitutes an oil chamber in which a later-described piston portion is accommodated.

The first pressing member 12 includes a rod-shaped main body 121, a movable portion (first movable portion) 123 attached to the tip of the main body 121 via a spring 122, and an axial lower side of the main body 121. , a disk-shaped piston portion 124 extending radially outward, and a disk-shaped detection body 125 attached to the rear end portion of the main body 121 . A through hole 126 extending in the axial direction is formed in the main body 121 and the movable portion 123 so that the air injected from the rear end of the main body 121 can be ejected from the front end of the movable portion 123 . Although not shown, air injection means for injecting air into the first pressing member 12 uses a compressor or the like, and can also measure the air pressure of the air passing through the through hole 126 .

The movable part 123 is formed in a cylindrical shape with a large-diameter part at the tip, and the tip surface can come into contact with the lower surface of the moving member 52 of the arbor 5 . A seal 123a is provided around the open end of the through-hole 126 to prevent air leakage from a portion in contact with the moving member 52, and the movable portion 123 is a spring (second spring) whose elastic force is weaker than the spring 53 of the arbor 5. It can reciprocate between a forward position pushed forward by the spring member 122 and a rearward position pushed backward against the spring 53. A seal 123b is provided.

A piston portion 124 attached to the main body 121 is accommodated in the oil chamber 14 described above, and is vertically movable within the oil chamber 14 . More specifically, a seal 127 is attached to the radially outer end surface of the piston portion 124 , and the seal 127 brings the piston portion 124 into liquid-tight contact with the inner wall surface of the oil chamber 14 . Therefore, in the oil chamber 14 , liquid-tight spaces are formed above and below the piston portion 124 . By selectively supplying hydraulic oil to the space above or below the piston portion 124 , the piston portion 124 moves upward or downward together with the main body 121 . Therefore, the support body 11 is formed with a first communication passage 151 that communicates with the upper side of the oil chamber 14 with the piston portion 124 interposed therebetween, and a second communication passage 152 that communicates with the lower side of the oil chamber 14 .

A body 121 protrudes from the lower end of the support body 11, and the detection body 125 is attached to the protruded portion. Three position sensors 161 to 163 for detecting the detection body 125 are attached to the lower end of the base portion 6 . These position sensors 161 to 163 are arranged in the axial direction, and can detect three axial positions of the first pressing member 12 by detecting the position of the detection body 125 . That is, it is possible to detect three positions: a pressing position where the first pressing member 12 is most advanced, a retracted position where the first pressing member 12 is most retracted, and a contact position between these pressing positions and retracted positions.

5, when the first pressing member 12 is at the retracted most retracted position, the first pressing member 12 and the moving member 52 of the arbor 5 are separated from each other. Therefore, the moving member 52 is in the fixed position. On the other hand, as shown in FIG. 6, when the first pressing member 12 is at the raised pressing position, the first pressing member 12 presses the moving member 52 to move the moving member 52 to the release position. Further, as shown in FIG. 7, when the first pressing member 12 is at the contact position, the first pressing member 12 and the moving member 52 are in contact, but the moving member 52 is at the fixed position. At this time, the movable portion 123 of the first pressing member 12 is in contact with the moving member 52 while being urged upward by the spring 122 . Therefore, the movable portion 123 is in close contact with the lower end surface of the moving member 52 . However, since the elastic force of the spring 122 of the movable portion 123 is weaker than the elastic force of the disc spring 53 of the moving member 52, the moving member 52 in the fixed position is not pushed toward the release position. Therefore, there is no concern that the work W will be released from the restraint.

As shown in FIG. 4 , the support body 11 is formed with a third communication passage 153 extending toward the inner peripheral surface of the first large diameter portion 13 . A tubular thin plate member 17 is arranged on the inner peripheral surface of the first large diameter portion 13 , and the thin plate member 17 is pressed radially inward by the hydraulic oil supplied to the third communication passage 153 . It is designed to be Therefore, the fixing portion 582 of the arbor 5 accommodated in the first large-diameter portion 13 is pressed by the thin plate member 17 so as to be fixed to the support body 11 .

Next, the operation of the work supporting unit 1 configured as described above will be described. The operation of attaching the work W to the work support unit 1 will be described below.

First, as shown in FIG. 5, the arbor 5 is attached to the work supporting unit 1 . That is, the fixing portion 582 of the arbor 5 is inserted into the first large diameter portion 13 of the support body 11 . Hydraulic oil is then supplied to the third communication passage 153 to press the thin plate member 17 radially inward. As a result, the thin plate member 17 presses the outer peripheral surface of the fixing portion 582 , and the arbor 5 is fixed to the support body 11 .

Next, as shown in FIG. 6, the first pressing member 12 is raised to press the moving member 52 and move the moving member 52 to the release position. Since the outer diameter of the collet chuck 55 is thereby reduced, the workpiece W is attached to the collet chuck 55 of the arbor 5 by the transfer arm 80 . At this time, the workpiece W is brought into contact with the seating surface 594 described above. Subsequently, as shown in FIG. 7, the first pressing member 12 is lowered to locate the first pressing member 12 at the contact position. In this process, the moving member 52 descends and is placed at the fixed position, so that the diameter of the collet chuck 55 is expanded and the workpiece W is fixed to the collet chuck 55 .

Then, when the position sensor 162 detects the contact position of the first pressing member 12, air injection means (not shown) is operated. This air passes through the through hole of the first pressing member 12, the first flow path 591 of the moving member 52, and the second flow path 592 of the arbor body 51, and is ejected from the opening 593 of the seating surface 594 on which the workpiece W is seated. When the workpiece W is correctly seated on the seating surface 594, the opening 593 is closed by the workpiece W, so the air pressure rises. By detecting this, it can be determined that the workpiece W is correctly seated. On the other hand, if the work W is not properly seated, air leaks from the opening 593. By detecting this, it is possible to detect that the work W is not properly seated. In this way, when the work W is confirmed to be seated, the first pressing member 12 is lowered and arranged at the retracted position. After that, when the hydraulic fluid is discharged from the third communication passage 153 , the pressure of the hydraulic fluid on the thin plate member 17 is released, and the arbor 5 with the work W attached can be removed from the work support unit 1 .

<3. Spindle unit>
Next, the spindle unit 3 will be described in detail with reference to FIGS. 8 to 10 as well. 8 is a cross-sectional view of the spindle unit, and FIGS. 9 and 10 are cross-sectional views of the spindle unit showing a state in which the arbor is attached.

As shown in FIG. 8, the spindle unit 3 includes a cylindrical housing 30 and a cylindrical rotation support (second support body) 7 housed inside the housing 30. The support 7 is rotatably supported around an axis extending vertically inside the housing 30 . A second pressing member 8 that axially presses a push rod 73 in the rotary support 7 is arranged on the same axis below the rotary support 7 as will be described later.

The rotary support 7 includes a cylindrical support body 71 and a tip support portion 72 attached to the tip of the support body 71, which are fixed with bolts or the like. The tip support portion 72 protrudes from the housing 30, and the arbor is detachably attached to this protruding portion. Further, a housing portion 721 for housing the fixing portion 582 of the arbor 5 is formed on the top surface of the tip support portion 72 , and a flange of the arbor 5 is formed around the housing portion 721 on the top surface of the tip support portion 72 . An annular seating surface (second seating surface) 722 with which the portion 581 abuts is formed.

Inside the housing 30, the upper end side and the lower end side of the support body 71 are rotatably supported by bearings 61 and 62, and an electric motor such as a spindle motor is mounted on the support body 71 between the bearings 61 and 62. The rotor of motor 63 is attached. The motor 63 drives the rotary support 7 to rotate about its axis. An inner space 70 extending in the axial direction is formed inside the support body 71, and a push rod (second moving member) 73 is arranged in the inner space 70 so as to be movable in the axial direction.

The internal space 70 includes a first portion 701 with a circular cross section that is open to the outside on the distal end side of the support body 71, and a second portion with a circular cross section that is connected to the lower end of the first portion 701 and has a smaller diameter than the first portion 701. 702, and a third portion 703, which is connected to the lower end of the second portion 702 and has a circular cross section larger in diameter than the second portion 702, are formed so as to communicate with each other. A lower end of the third portion 703 is open to the inside of the housing 30 from the lower portion of the support body 71 . Also, the upper end of the first portion 701 communicates with the housing portion 721 described above.

The push rod 73 includes a rod-shaped main body portion 731 , a first stopper 732 connected to the tip of the main body portion 731 , and a second stopper 733 connected to the lower end of the main body portion 731 . Both the first stopper 732 and the second stopper 733 are formed in a cylindrical shape with a diameter larger than that of the main body portion 731 . The first stopper 732 is arranged at the first portion 701 of the internal space 70 and the body portion 731 extends over the second portion 702 and the third portion 703 . Further, while the first stopper 732 is in airtight contact with the inner wall surface of the first portion 701 , the body portion 731 near the first stopper 732 is also in airtight contact with the inner wall surface of the second portion 702 . An airtight space is formed between the lower end surface and the lower end surface of the first portion 701 . The second stopper 733 is slidably in contact with the inner wall surface of the third portion 703 and is arranged to be exposed inside the housing 30 from the lower end of the third portion 703 . Furthermore, in the third portion 703, a disc spring (third spring member) 74 is arranged between the tip end surface of the third portion 703 and the second stopper 733 so as to cover the periphery of the main body portion 731. (only part of it is shown in FIG. 8). As a result, an elastic force acts so that the disc spring 74 pushes the second stopper 733 toward the lower end side. On the other hand, the first stopper 732 is a stopper that engages with the step between the first portion 701 and the second portion 702 to prevent the push rod 73 from coming off to the lower end side due to the elastic force of the disc spring 74 . ing. In this manner, the push rod 73 is always pushed downward by the disc spring 74, and the pushed position serves as a fixing position for fixing the arbor 5 as described later. The position pushed upward by the second pressing member 8, which will be described later, is the release position where the arbor 5 is released.

A chuck (fixing tool) 75 is attached to the tip of the first stopper 732 and is formed to detachably fix the fixing portion 582 of the arbor 5 . More specifically, the chuck 75 is provided with a plurality of claws that open so that the diameter of the distal end side increases when the push rod 73 rises, and closes so that the diameter decreases when the push rod 73 descends. Therefore, when the push rod 73 is in the fixed position, the chuck 75 has a smaller diameter on the distal end side and fixes the fixed portion 582 of the arbor 5 . On the other hand, when the push rod 73 is at the release position, the diameter of the distal end side is increased so that the fixing portion 582 of the arbor 5 is fixed.

Next, an air passage for confirming seating of the arbor 5, which is formed inside the spindle unit 3, will be described. As shown in FIG. 8, a first channel (third channel) 91 extending in the axial direction is formed inside the push rod 73 . Air is injected into the first flow path 91 as described later. An upper end portion of the first flow path 91 extends radially outward from the first stopper 732 and extends from the inner wall surface of the first portion 701 toward the support main body 71 and the tip support portion 72 side. It communicates with the channel (fourth channel) 92 . The second flow path 92 extends upward and is connected to an opening (second opening) 93 formed in the seating surface 722 of the tip support portion 72 . Therefore, when the arbor 5 is attached to the seating surface 722 in the correct posture, the flange portion 581 of the arbor 5 closes the opening. A plurality of second flow paths 92 and openings 93 can be provided so as to correspond to the seating surface 722 .

Next, the second pressing member 8 will be described with reference to FIGS. 9 and 10 as well. As shown in FIG. 8, the second pressing member 8 is a member for pressing the push rod 73 of the rotary support 7 at the rear end of the housing 30. A movable portion (second movable portion) 83 attached to the tip portion via a spring 82 , a piston portion 84 formed near the axial center of the main body 81 and extending radially outward, and the rear end of the main body 81 . and a disc-shaped detection body 85 attached to the portion. As shown in FIG. 8 , the main body 81 and the movable portion 83 are formed with through holes 801 extending in the axial direction so that the air injected from the rear end of the main body 81 can be jetted from the front end of the movable portion 83 . It's becoming Although not shown, air injection means for injecting air into the second pressing member 8 may be a compressor or the like, or may measure the air pressure from the through hole 801 to the first flow path 91 of the push rod 73. It is possible.

The movable portion 83 has a large-diameter portion at its tip and is formed in a columnar shape, and the tip surface can come into contact with the second stopper 733 of the push rod 73 . A seal (not shown) is provided around the opening end of the through-hole 801 to prevent air leakage from the point of contact with the second stopper 733 . It is capable of reciprocating between an upper position pushed upward by a fourth spring member 82 and a lower position pushed downward against the spring 82, and its sliding surface is airtight. It is equipped with a seal (not shown) for

A piston portion 84 attached to the main body 81 is accommodated in a cylindrical oil chamber 64 formed at the rear end portion of the housing 30 and is vertically movable within the oil chamber 64 . More specifically, a seal 841 is attached to the radially outer end surface of the piston portion 84 , and the seal 841 brings the piston portion 84 into liquid-tight contact with the inner wall surface of the oil chamber 64 . Therefore, in the oil chamber 64 , liquid-tight spaces are formed above and below the piston portion 84 . By selectively supplying hydraulic oil to the upper space or the lower space of the piston portion 84, the piston portion 84 moves upward or downward together with the main body 81. As shown in FIG.

A main body 81 protrudes from the lower end of the housing 30, and the detection body 85 is attached to the protruded portion. Three position sensors 65 to 67 for detecting the detection body 85 are attached to the lower end of the housing 30 . These position sensors 65 to 67 are arranged in the axial direction, and by detecting the position of the detection body 85, three positions of the second pressing member 8 in the axial direction can be detected. That is, it is possible to detect three positions: the pressing position where the second pressing member 8 is most advanced, the retracted position where the second pressing member 8 is most retracted, and the contact position between these pressing positions and retracted positions.

10, when the second pressing member 8 is at the retracted most retracted position, the second pressing member 8 and the push rod 73 are separated from each other. The push rod 73 is therefore in a fixed position. On the other hand, as shown in FIG. 8, when the second pressing member 8 is at the raised pressing position, the second pressing member 8 presses the push rod 73 to move the push rod 73 to the release position. Also, as shown in FIG. 9, when the second pressing member 8 is at the contact position, the second pressing member 8 and the push rod 73 are in contact, but the push rod 73 is at the fixed position. At this time, the movable portion 83 of the second pressing member 8 is in contact with the push rod 73 while being urged upward by the spring 82 . Therefore, the movable portion 83 is in close contact with the lower end surface of the push rod 73 . However, since the elastic force of the spring 82 of the movable portion 83 is weaker than the elastic force of the disc spring 74 that presses the push rod 73, the push rod 73 in the fixed position is not pushed toward the release position. Therefore, there is no concern that the restraint of the arbor 5 will be released.

Next, the operation of the spindle unit 3 configured as described above will be described. The operation of attaching the arbor 5 to the spindle unit 3 will be described below.

First, as shown in FIG. 8, oil is supplied to the oil chamber 64 on the retraction side, and the second pressing member 8 at the retracted position is advanced to the pressing position. In this process, the second pressing member 8 presses the movable portion 83 against the second stopper 733 at the rear end of the push rod 73 via the spring 82 . Then, while the movable portion 83 is in contact with the second stopper 733 , the main body 81 advances further, and the movable portion 83 is pushed toward the main body 81 while compressing the spring 82 . Then, from the state where the movable portion 83 is completely pushed toward the main body 81 side, the main body 81 is further raised, the second stopper 733 is pressed by the second pressing member 8, and the push rod 73 is pushed by the elastic force of the disc spring 74. resist and rise. In this way, when the push rod 73 moves to the release position, the diameter of the tip side of the chuck 75 increases, and the fixing portion 582 of the arbor 5 can be attached to the chuck 75 .

Next, the arbor 5 is attached to the spindle unit 3, as shown in FIG. That is, the fixed portion 582 of the arbor 5 is attached to the chuck 75 . As a result, the arbor 5 closes the opening 93 of the seating surface 722 of the tip support portion 72 . Subsequently, oil is supplied to the contraction-side oil chamber of the piston portion 84, and the second pressing member 8 is lowered. As a result, the push rod 73 is pressed by the disc spring 74 and lowered to the fixed position. At this time, as the push rod 73 descends, the diameter of the tip of the chuck 75 becomes smaller, and the claws of the chuck 75 fix the fixing portion 582 of the arbor 5 . The arbor 5 is thus fixed to the spindle unit 3 .

Then, as shown in FIG. 9, when the second pressing member 8 descends to the contact position, the push rod 73 retreats to the fixed position, but the movable portion 83 is still pushed against the spring 82 by the main body 81. ing. Therefore, the movable portion 83 is in a state of being in close contact with the second stopper 733 of the push rod 73 . The elastic force of the spring 82 of the second pressing member 8 is weaker than the elastic force of the disc spring 74 of the push rod 73, thereby preventing the push rod 73 in the fixed position from being pushed toward the release position. Therefore, there is no concern that the restraint of the arbor 5 will be released.

When the position sensor 66 detects the contact position of the second pressing member 8, air injection means (not shown) is operated. That is, when air is injected from the rear end of the second pressing member 8 , the air passes through the through hole 801 of the second pressing member 8 , the first channel 91 of the push rod 73 , the second channel 92 , and the air from the opening 93 . is injected. At this time, when the arbor 5 is correctly seated, the opening 93 is closed by the flange portion 581 . As a result, air is not injected from the opening 93, so the air pressure rises. In this way, it can be detected that the arbor 5 is attached to the correct position. On the other hand, if the arbor 5 is not seated at the correct position, air leaks from the opening 93, and the air pressure drops. Therefore, when this is detected, it is preferable to activate an alarm (not shown) and move the second pressing member 8 forward to the pressing position again to prompt the arbor 5 to be attached to the correct position.

When the mounting position of the arbor 5 is thus confirmed, the second pressing member 8 is retracted to the retracted position as shown in FIG. As a result, the movable portion 83 of the second pressing member 8 is separated from the push rod 73, so that the rotary support 7 can be rotated by the electric motor 63 while the arbor 5 remains fixed.

<4. Transfer unit>
As shown in FIG. 2 , the transport unit 4 is arranged between the work support unit 1 and the spindle unit 3 on the base portion 6 . The conveying unit 4 includes a vertically extending shaft member 41 and a drive unit 42 that raises and lowers the shaft member 41 and rotates it about its axis. A horizontally extending swivel arm 43 is attached to the upper end of the shaft member 41 , and clamping arms 44 for gripping the arbor 5 are attached to both ends of the swivel arm 43 .

FIG. 2 shows a state in which the shaft member 41 is lifted while the arbor 5 on the work support unit 1 and the arbor 5 on the spindle unit 3 are held by the clamping arm 44 . When the shaft member 41 is rotated 180 degrees from this state, the swivel arm 43 swivels, the arbor 5 on the work support unit 1 is arranged above the spindle unit 3, and the arbor 5 on the spindle unit 3 is moved. It is arranged above the work support unit 1 . After that, when the shaft member 41 is lowered, the arbor 5 is attached to the spindle unit 3 and the work support unit 1, respectively. In this manner, the transport unit 4 is configured to replace the arbor 5 on the work support unit 1 and the arbor 5 on the spindle unit 3 .

<5. Tool unit>
Next, the tool unit 2 will be explained. As shown in FIG. 1 , the tool unit 2 includes a column 21 arranged on the base portion 6 and a saddle 22 that is separated from the column 21 with respect to the spindle unit 3 . A grindstone 23 is rotatably supported at the tip of the saddle 22 . Although not shown, the tool unit 2 is provided with a drive source such as a motor for rotating the grindstone 23 . The grindstone 23 is formed in a cylindrical shape and has a thread formed on its surface. The screw meshes with the teeth of the workpiece W, and the grindstone 23 and the workpiece W rotate synchronously, whereby the workpiece W is ground.

<6. Operation of Gear Machining System>
Next, the operation of the gear machining system configured as described above will be described. First, the arbor 5 is attached to the work supporting unit 1 and the spindle unit 3, respectively. At this time, the shaft member 41 of the transport unit 4 is lowered, but each clamping arm 44 is opened. Therefore, each clamping arm 44 is separated from the arbor 5 .

Next, the work W transported by the transport arm 80 is attached to the work supporting unit 1 . At this time, as described above, the first pressing member 12 is moved up and down, and seating confirmation of the work W is performed. When the air pressure of the injected air is low, it is determined that the work W is not mounted in the correct position. Therefore, for example, the work W is remounted after confirming the entry of foreign matter.

Next, the arbor 5 is replaced by the transport unit 4 . Thereby, the arbor 5 to which the work W is attached is attached to the spindle unit 3 . At this time, in the spindle unit 3, the second pressing member 8 is moved up and down, and seating confirmation of the arbor 5 is performed. When the pneumatic pressure of the injected air is low, it is determined that the arbor 5 is not installed in the correct position. Therefore, for example, after confirming the intrusion of foreign matter, the arbor 5 is installed again.

Subsequently, in the spindle unit 3 , the motor 63 is driven to rotate the rotary support 7 . As a result, the arbor 5 and the work W attached thereto rotate around the axis. Also in the tool unit 2, the grindstone 23 is rotated. At this time, the rotary support 7 and the grindstone 23 are rotated synchronously, and the saddle 22 is driven to bring the grindstone closer to the work W. As shown in FIG. Then, the grindstone 23 is meshed with the work W, and the work W is machined while the two are rotated together.

While the machining is being performed in this manner, a new work W is attached to the arbor 5 placed on the work support unit 1 by the transfer arm 80 in the same procedure as described above. When the machining of the work W attached to the spindle unit 3 is completed, the tool unit 2 is separated from the spindle unit 3, and then the arbor 5 is replaced by the transfer unit 4. As a result, the arbor 5 to which the machined work W is attached is attached to the work support unit 1 , and the arbor 5 to which a new work W is attached is attached to the spindle unit 3 . After that, the spindle unit 3 is driven to process the work W, and in the work support unit 1, the work W after processing is removed by the transfer arm 80, and a new work W is attached. A plurality of workpieces are machined by repeating the above steps.

<7. Features>
As described above, according to the present embodiment, in the work supporting unit 1, the first pressing member 12 presses the moving member 52 of the arbor 5, thereby expanding and contracting the collet chuck 55 that restrains the work W. can. In addition, while the movable portion 123 of the first pressing member 12 is in contact with the moving member 52, air is injected into the moving member 52 so that the air can be jetted from the opening 593 formed at the mounting position of the work W. It has become. Therefore, when the opening 593 is blocked by the work W and air does not leak, the air pressure does not decrease, so it can be determined that the work W is correctly attached, and when air leaks from the opening 593, the air pressure decreases. Therefore, it can be determined that the work W is correctly attached.

At this time, although the movable portion 123 comes into contact with the moving member 52, it does not press the moving member 52, so that the work W is kept restrained and seating can be confirmed with high accuracy.

A similar arrangement is provided for the spindle unit. That is, by pressing the push rod 73 with the second pressing member 8, the chuck 75 that restrains the arbor can be expanded and contracted. When the second pressing member 8 is separated from the push rod 73, the rotation support 7 can be rotated together with the push rod 73, so that the arbor 5 can be restrained and rotated for processing. Further, air can be injected into the push rod 73 while the movable portion 83 of the second pressing member 8 is in contact with the push rod 73, and the air can be jetted from the opening 93 formed at the mounting position of the arbor 5. It's like Therefore, when the opening 93 is blocked by the arbor 5 and air does not leak, the air pressure does not decrease, so it can be determined that the arbor 5 is properly attached, and when air leaks from the opening 93, the air pressure decreases. Therefore, it can be determined that the arbor 5 is correctly attached.

At this time, although the movable portion 83 comes into contact with the push rod 73, it does not push the push rod 73, so that the arbor 5 is kept restrained and the seating can be confirmed with high accuracy.

As described above, in the present embodiment, the seating of the workpiece W and the seating of the arbor 5 can be automatically confirmed in a series of steps, so the operator does not need to visually confirm the seating. Machining efficiency can be improved.

<8. Variation>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the invention.

In the spindle unit 3, the arbor 5 is fixed by a fixing mechanism having a chuck and a push rod. The configuration of the mechanism is not particularly limited.

The configuration of the tool unit 2 described in the above embodiment is just an example, and it is sufficient if a tool capable of forming a gear on the outer peripheral surface of the workpiece W attached to the spindle unit 3 is provided. Therefore, it may be a tool unit for gear cutting or gear grinding that includes an external gear-shaped or screw-shaped tool.

In the work support unit 1 described above, the arbor 5 is fixed by pressing the thin plate member 17 with hydraulic oil. Various mechanisms can be employed.

The work support unit 1 and the spindle unit 3 described above can also be used independently. Also, the configuration of the transport unit is not particularly limited as long as it is configured such that the arbor can be exchanged between the work support unit 1 and the spindle unit 3 . As a specific configuration, for example, the configuration described in JP-A-2015-136747 can be adopted.

1 work support unit 2 tool unit 3 spindle unit 4 transfer unit 5 arbor (work jig)

Claims (6)

A work jig that detachably fixes a work W and is detachably supported by a work support unit,
a jig body having a cylindrical mounting portion at the tip;
It can be inserted into the through-hole of the workpiece W, is arranged to cover the mounting portion, and has a diameter that decreases when moving toward the front end side of the mounting portion in the axial direction and increases when moving toward the rear end side in the axial direction. a fixing member whose diameter can be expanded and contracted so that
A first movement that is inserted in the jig body in the axial direction and is axially movable between a release position in which the fixing member is arranged on the distal end side and a fixed position in which the fixing member is arranged on the rear end side. a member;
a first spring member that biases the first moving member toward the fixed position;
with
A first flow path is formed in the first moving member,
The jig body has a first seating surface for the workpiece W when the workpiece W is attached to the fixing member, a first opening capable of ejecting air from the first seating surface, the first opening, and a second flow path communicating with the first flow path is formed;
The first moving member is configured to be pressed from the fixed position to the released position by a first pressing member provided in the work support unit,
When the first moving member is in the fixed position, the first flow path is injected from the air injection port provided in the first pressing member while the first pressing member is in contact with the first moving member. and a work jig configured to be able to eject air from the first opening via a second flow path. A work jig according to claim 1;
a work support unit that detachably supports the work jig;
with
The work support unit is
a first support body that supports the work jig;
a first pressing member attached to the first support body and capable of pressing the first moving member from the rear end side in the axial direction toward the release position;
with
The first pressing member is capable of maintaining contact with the first moving member when the first moving member is at the fixed position, and is capable of injecting air into the first flow path of the first moving member. has a mouth,
The first pressing member is
a pressing position for pressing the first moving member against the first spring member so as to move the first moving member to the release position;
a contact position where the first moving member is in contact with the first moving member while the first moving member is moved to the fixed position;
A workpiece support system that is axially movably supported so as to take a retracted position spaced from the first moving member. The first pressing member is
an axially movable first pressing body;
a first movable portion attached to an axial tip portion of the first pressing body via a second spring member having a biasing force weaker than that of the first spring member, and having the injection port formed thereon;
with
3. The apparatus according to claim 2, wherein when said first pressing member is at said contact position, said first pressing member is configured to press said first movable portion against said first moving member by means of said second spring member. A workpiece support system as described. further comprising a spindle unit for detachably attaching the work jig,
The spindle unit is
a second support body that supports the work jig and has a second seating surface on which the work jig is seated;
a housing that supports the second support body so as to be rotatable about the axial direction;
a fixing mechanism attached to the second support body and detachably fixing the work jig;
a second pressing member attached to the housing;
with
The fixing mechanism is
a second moving member that moves to a release position when pressed by the second pressing member and moves to a fixed position when the pressing by the second pressing member is released;
a third spring member that biases the second moving member toward the fixed position;
A fixture configured to release fixation of the work jig when the second moving member is at the release position, and to fix the work jig when the second movement member is at the fixing position. When,
a third flow path provided in the second moving member and through which air flows;
has
The second support body has a fourth flow path communicating with the third flow path, and a second opening formed in the second seating surface connected to the fourth flow path,
The second pressing member is
When the second moving member is at the fixed position, it can maintain contact with the second moving member, and has an injection port capable of injecting air into a third flow path of the second moving member,
The second pressing member is
a pressing position for pressing the second moving member against the third spring member so as to move the second moving member to the release position;
a contact position where the second moving member is in contact with the second moving member while the second moving member is moved to the fixed position;
a retracted position spaced apart from the second moving member;
4. A work support system according to claim 2 or 3, wherein the work support system is axially movably supported so that The second pressing member is
an axially movable second pressing body;
a second movable part, which is attached to the tip of the second pressing body in the axial direction via a fourth spring member having a biasing force weaker than that of the third spring member, and in which the injection port is formed;
with
5. The apparatus according to claim 4, wherein when said second pressing member is at said contact position, said second pressing member is configured to press said second movable portion against said second moving member by means of said fourth spring member. A workpiece support system as described. a transfer unit that transfers the work jig between the work support unit and the spindle unit;
a tool unit for processing a work W attached to a work jig supported by the spindle unit;
6. A work support system according to claim 4 or 5, further comprising:

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