Work centering device

Abstract

The present invention aims to provide a workpiece centering device that has a simple structure, can reliably clamp a workpiece without processing the workpiece, and can be easily attached and detached. [Solution] The work centering device 3 of the present invention has a pair of reversing devices 1 arranged along the X-axis in a plan view, the reversing device 1 has a reversing part 2 that rotates around the X-axis, and the reversing part 2 is provided to clamp both ends of the workpiece W in the X direction, the reversing part 2 is provided with a base 11, the base 11 is provided with a pair of centering vises 12 that clamp both sides of the workpiece W in the Y direction and are movable in the Y direction, the centering vises 12 are provided with a pair of jaws 14 that clamp both sides of the workpiece W in the Z direction and are movable in the Z direction, and of the pair of jaws 14, at least the upper jaw 14a is provided to be movable in the Y direction.

Description

Technical Field

[0001] The present invention relates to a workpiece centering device.

Background Art

[0002] There is a device that centers and holds both ends of a workpiece on a holding part provided on a pair of reversing devices and reverses the workpiece.

[0003] As a device for reversing construction steel materials such as H-shaped steel as a workpiece, there are the section steel manufacturing equipment described in Japanese Patent Application Laid-Open No. 7-157074 (Patent Document 1), the welding support base for joints described in Japanese Patent Application Laid-Open No. 2011-167703 (Patent Document 2), and the self-propelled steel material rotating device described in Japanese Patent Application Laid-Open No. 2021-167014 (Patent Document 3).

[0004] Also, as a device for reversing a press die as a workpiece, the die reversing device described in Japanese Patent Application Laid-Open No. 2024-19742 (Patent Document 4) is known.

[0005] The section steel manufacturing equipment described in Patent Document 1 is section steel manufacturing equipment that passes section steel passed from one direction through a processing machine, reverses it by a reversing device, and then passes it through the processing machine from the other direction. The reversing device includes a conveyor that supports and guides the section steel, a stationary holding device located on the processing machine side, and a movable holding device located on the side away from the processing machine and movable closer to and away from the stationary holding device. Both holding devices include a main body, a lifting body that can move up and down with respect to this main body, and a clamp device that is attached to this lifting body and can rotate around the front and rear axes. These clamp devices are characterized in that they are configured to be able to clamp the web material of the section steel on the conveyor.

[0006] The welding support stand for joints described in Patent Document 2 is a welding support stand for joints that detachably supports joints connected by tack welding beam attachments to the wall surface of a joint core and holds them with a pair of rotary positioners, and comprises a mounting section provided to place a plurality of the joints on the same plane at a position between the pair of rotary positioners, a support mechanism provided on the mounting section to support the beam attachments of the joints, and columnar parts provided at both ends of the mounting section and detachably held by fixing jigs provided inside the annular part of the rotary positioner.

[0007] The self-propelled steel material rotating device described in Patent Document 3 comprises a pair of drive devices and driven devices, each having a base, a rotating shaft, and a mounting section, each having a base, a rotating shaft, and a mounting section, each having a wheel attached to the base of the drive device and the driven device so that the base can move, the base of the drive device is provided with a rotating mechanism that makes the rotating shaft rotatable and a wheel driving mechanism that makes the wheels of the drive device move in the front-rear direction on a plane, each having a mounting plate, the mounting plate having bolt holes on which steel materials are placed and bolted, and the mounting section is characterized in that it can rotate around the rotating shaft as the rotating shaft rotates.

[0008] The mold inversion device described in Patent Document 4 is a mold inversion machine having a holding part that inverts the upper and lower surfaces of a mold by holding and rotating both the left and right sides of the mold, wherein the holding part has engaging parts that engage with engaged parts provided on both sides of the mold in a manner that allows for detachable engagement, and the engaging parts and engaged parts engage with the descending mold to hold the mold, maintain the engagement to hold the mold during inversion, and allow the mold to rise after inversion. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 07-157074 [Patent Document 2] Japanese Patent Publication No. 2011-167703 [Patent Document 3] Japanese Patent Publication No. 2021-167014 [Patent Document 4] Japanese Patent Publication No. 2024-019742 [Overview of the project] [Problems that the invention aims to solve]

[0010] The clamping device described in Patent Document 1 clamped both sides of the web material of the H-beam, which raised concerns about its ability to clamp heavy H-beams.

[0011] The device described in Patent Document 2 had a complex structure and high equipment costs.

[0012] In the method described in Patent Document 3, the steel material is fixed to the mounting section by aligning the bolt holes in the steel material with the bolt holes in the mounting plate and tightening them with bolts, which makes the process of attaching and detaching the steel material time-consuming.

[0013] The method described in Patent Document 4 requires engaging parts to be provided on both sides of the mold, which is the workpiece, making the manufacturing process cumbersome.

[0014] Therefore, the present invention aims to provide a workpiece centering device that has a simple structure, can reliably clamp a workpiece without processing the workpiece, and can be easily attached and detached. [Means for solving the problem]

[0015] To achieve the above objective, the present invention employs the following means. That is, the present invention provides a workpiece centering device in which a pair of reversing devices are arranged along the X-axis in a plan view, the reversing devices having a reversing part that rotates around the X-axis, and the reversing part is provided to clamp both ends of a workpiece in the X-direction, wherein a base is provided on the reversing part, a pair of centering vises for clamping both sides of the workpiece in the Y-direction is provided on the base so as to be movable in the Y-direction, a pair of jaws for clamping both sides of the workpiece in the Z-direction is provided on the centering vises so as to be movable in the Z-direction, and at least the upper jaw of the pair of jaws is provided so as to be movable in the Y-direction.

[0016] Preferably, one of the pair of reversing devices has a fixed frame, and the other has a movable frame that can move in the X direction, and the reversing section is provided on both frames.

[0017] Preferably, the base is provided with a lateral movement mechanism for bringing the pair of centering vises closer together and further apart, and the centering vises are provided with a vertical movement mechanism for bringing the upper jaw and lower jaw closer together and further apart.

[0018] The lateral movement means consists of a horizontal screw shaft provided at the base and a nut provided on the centering vise that screws onto the horizontal screw shaft, and the vertical movement means consists of a vertical screw shaft provided on the centering vise and a pair of sliders that screw onto the vertical screw shaft and move up and down, preferably with the sliders provided with the upper jaw and lower jaw.

[0019] Preferably, the horizontal and vertical screw shafts have right-hand and left-hand threads formed on either side of their central portion.

[0020] It is preferable that a motor is provided to drive the aforementioned horizontal screw shaft and vertical screw shaft.

[0021] The lateral movement means and the vertical movement means may be driven by a fluid pressure-driven cylinder device.

[0022] The workpiece is an H-shaped steel having a web and flanges. The fixed machine frame and the movable machine frame each have a portal frame and a lifting part provided movably in the Z-axis direction within the space of the portal frame. The reversing part is provided on the lifting part. The portal frame is provided with a ball screw along the Z-axis direction and a lifting motor for driving the ball screw, so as to configure the lifting part to be movable up and down. It is preferable that a reversing motor for driving the reversing part is provided on the lifting part.

[0023] It is preferable that a receiving block for supporting the lower surface of the horizontal web of the H-shaped steel is provided on the base.

[0024] The workpiece can be a press die.

[0025] In the workpiece centering device of the present invention, a pair of centering vises for sandwiching both side surfaces of the workpiece in the Y direction are provided movably in the Y direction on a base.

[0026] A pair of jaws for sandwiching both side surfaces of the workpiece in the Z direction are provided movably in the Z direction on the centering vise.

Advantages of the Invention

[0027] According to the present invention, the structure is simple, the workpiece can be reliably centered and clamped, and the effect that the attachment and detachment work of the workpiece in the vertical direction can be easily performed is achieved.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a plan view showing an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of FIG. 1. [Figure 3] FIG. 3 is a left side view of FIG. 2. [Figure 4] FIG. 4 is a sectional view taken along line D-D of FIG. 3. [Figure 5] FIG. 5 is a sectional view taken along line A-A of FIG. 2. [Figure 6] Figure 6 is a cross-sectional view along line BB in Figure 2. [Figure 7] Figure 7 is a perspective view showing the reversing device for a fixed machine frame. [Figure 8] Figure 8 is a cross-sectional view corresponding to line AA, showing the H-beam rotated 90 degrees. [Figure 9] Figure 9 is a perspective view of the work centering device. [Figure 10] Figure 10 is a plan view of the work centering device with an H-shaped steel beam attached. [Figure 11] Figure 11 is a front view of Figure 10. [Figure 12] Figure 12 is a left side view of Figure 11. [Figure 13] Figure 13 is a cross-sectional view taken along line AA in Figure 12. [Figure 14] Figure 14 is a cross-sectional view taken along the line B-B in Figure 12. [Figure 15] Figure 15 is a plan view showing a support base that supports the underside of the flange, as an alternative to the table lift. [Figure 16] Figure 16 is a side view of Figure 15. [Figure 17] Figure 17 is a plan view showing the support base that supports the underside of the web. [Figure 18] Figure 18 is a side view of Figure 17. [Modes for carrying out the invention]

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0030] In the plan view of Figure 1, a pair of reversing devices 1 are arranged along the X-axis in a plan view. As shown in Figure 4, each reversing device 1 has a reversing section 2 that rotates around the X-axis. A workpiece centering device 3 is provided on this reversing section 2 to clamp both ends of the workpiece W in the X-direction. In this embodiment, the workpiece W is shown as an H-shaped steel beam consisting of a web 4 and flanges 5 on both sides of the web 4.

[0031] The X, Y, and Z coordinates used in the following explanation are defined as those in the plan view shown in Figure 1.

[0032] As shown in Figure 2, one of the pair of inversion devices 1 has a fixed frame 6, and the other has a movable frame 7 that can move in the X direction. Both frames 6 and 7 are provided with inversion sections 2. The fixed frame 6 is placed on the flow, and the movable frame 7 is provided with wheels 9 that roll along guide rails 8. A table lift 10 is provided at an intermediate position between the pair of inversion devices 1. This table lift 10 is provided with adjustable height to prevent deflection of the workpiece W, whose ends are held by both inversion devices 1, 1, and to support the load of the worker working on the workpiece W, but it may also be a stand without height adjustment function. The table lift 10 can run along rails 8 and its position can be freely changed to match the length of the H-shaped steel 1.

[0033] Figures 15 and 16 show a configuration in which a support stand 21 is used instead of a table lift 10. This support stand 21 is equipped with rollers 23 that run on rails 22. The upper surface of the support stand 21 is designed to support the lower surface of the flange 5 of the H-beam 1. The configuration allows for the use of spacers 24 depending on the size of the H-beam 1. Figures 17 and 18 show a configuration in which the support stand 21 supports the lower surface of the web 4.

[0034] As shown in Figure 9, the work centering device 3 has a base 11, which is provided on the reversing section 2 of the reversing device 1, as shown in Figure 4.

[0035] As shown in Figure 7, a pair of centering vises 12, 12 are provided on the base 11 so as to be movable in the Y direction, and these vises grip both sides of the workpiece W in the Y direction. Opposite sides of this pair of centering vises 12 are clamping surfaces 13 that grip both sides of the workpiece W in the Y direction. These clamping surfaces 13 are designed to grip the flange 5 sides of the H-shaped steel workpiece W.

[0036] A pair of jaws 14 are provided on the centering vise 12 so as to be movable in the Z direction, and these jaws 14 are designed to grip both sides of the workpiece W in the Z direction. The pair of jaws 14 are designed to grip the upper and lower end faces of the flange 5 of the H-shaped steel workpiece W.

[0037] Of this pair of jaws 14, at least the upper one is a movable jaw 14a that is movable in the Y direction. The lower one is a fixed jaw 14b that does not move.

[0038] The pair of centering vises 12 and the pair of jaws 14 are positioned so as to be point-symmetric with respect to the rotation axis of the reversing unit 2 (see Figure 4).

[0039] As shown in Figure 9, the base 11 is provided with a lateral movement mechanism 15 for bringing a pair of centering vises 12 closer together and further apart. The centering vises 12 are provided with a vertical movement mechanism 16 for bringing the upper movable jaw 14a and the lower fixed jaw 14b closer together and further apart.

[0040] As shown in Figure 13, the lateral movement mechanism 15 consists of a lateral screw shaft 15a rotatably mounted on the base 11 and a nut 15b mounted on the centering vise 12 that screws onto the lateral screw shaft 15a.

[0041] As shown in Figure 14, the vertical movement mechanism 16 consists of a vertical screw shaft 16a provided on the centering vise 12 and a pair of sliders 16b that are screwed onto the vertical screw shaft 16a and move up and down. Of the pair of sliders 16b, the upper slider 16b is provided with a movable jaw 14a that can move freely in the Y direction, and the lower slider 16b is fixed with a fixed jaw 14b.

[0042] The horizontal screw shaft 15a and the vertical screw shaft 16a have right-hand threads and left-hand threads formed on either side of their central portion.

[0043] By rotating the horizontal screw shaft 15a, the pair of centering vises 12 move evenly closer to and further away from the rotation axis of the reversing section 2. Similarly, by rotating the vertical screw shaft 16a, the pair of jaws 14 move evenly closer to and further away from the rotation axis. Motors can be provided to drive the horizontal screw shaft 15a and the vertical screw shaft 16a.

[0044] As shown in Figures 3 to 7, the fixed machine frame 6 and the mobile machine frame 7 are formed in a gantry frame. Within the internal space of this gantry frame, a lifting section 17 is provided that is guided by the frames on both sides and is movable in the Z-axis direction. A reversing section 2 is provided on the lifting section 17 so as to be rotatable around the X-axis. The gantry frame is provided with a lifting mechanism 18 for moving the lifting section 17 up and down. The lifting mechanism 18 includes a ball screw 18a aligned with the Z-axis direction, a lifting motor 18b that drives the ball screw 18a, and a gas balancer 18c. The gas balancer 18c is provided between the lifting section 17 and the machine frame 6 or 7 and assists the lifting motor 18b. Although the ball screw 18a is used as an example, it is not limited to this. The lifting section 17 is provided with a reversing motor 19 that rotates and drives the reversing section 2.

[0045] As shown in Figure 4, a support block 20 is provided on the base 11 of the work centering device 3. This support block 20 supports the lower surface of the horizontal web 4 at the longitudinal end of the H-shaped steel workpiece W.

[0046] The operation of the above embodiment will now be described.

[0047] The procedure for setting the H-shaped steel workpiece W in the workpiece centering device 3 to the state shown in Figure 2 is as follows.

[0048] The H-shaped steel workpiece W is suspended above by an overhead crane between a pair of inversion devices 1, 1, with the web 4 in a horizontal position and the flange 5 in a vertical position.

[0049] The reversing device 1 of the mobile frame 7 is stationary in a position where it can accept the workpiece W. The pair of centering vises 12, 12 of the centering device 3 are also stationary with their clamping surfaces 13 in a position where they can accept the workpiece W. The pair of jaws 14a, 14b of the centering device 3 are also stationary at a position greater than or equal to the height (width) of the flange, and the upper mobile jaw 14a is stationary in a position where it can accept the workpiece W (in a position where its inner end does not protrude inward from the clamping surface 13 (see the upper left jaw in Figure 5)).

[0050] The workpiece W, suspended from the overhead crane, descends, and the lower surface of the web 4 is caught by the support block 20, stopping its descent.

[0051] From the above state, the mobile frame 7 moves toward the workpiece W, and the longitudinal end of the workpiece W comes into contact with the base 11 (see Figure 4).

[0052] Next, the horizontal screw shaft 15a of the horizontal movement mechanism 15 is rotated to press the clamping surface 13 of the centering vise 12 against the side of the flange 5 (see Figures 5 and 13). The upper movable jaw 14a is made to protrude inward (see the position of the right movable jaw 14a in Figure 5). The vertical screw shaft 16a of the vertical movement mechanism 16 is rotated to bring the upper and lower jaws 14 closer together and clamp the upper and lower end faces of the flange 5.

[0053] Through the above operations, the workpiece W is centered with respect to the rotation center of the reversal unit 2.

[0054] To rotate the workpiece W by 90 degrees, the lifting unit 17 is raised by the lifting motor 18b of the lifting means 18 to a position where the lower part of the workpiece W does not collide with the floor when rotated. Then, the rotation motor 19 is driven to rotate the rotation unit 2 by 90 degrees (see Figure 8).

[0055] To remove the workpiece W from the workpiece centering device 3, simply follow the reverse procedure described above.

[0056] According to the above embodiment, the structure is simpler than conventional methods, the workpiece W can be reliably centered and clamped, and the workpiece W can be easily attached and detached in the vertical direction.

[0057] The workpiece W can be a press die. The holding part of the die reversal device described in Patent Document 4 (Japanese Patent Application Publication No. 2024-019742) can be the workpiece centering device 3 of the present invention.

[0058] According to this embodiment, it is no longer necessary to machine an engagement portion on the end face of the mold, as described in Patent Document 4.

[0059] The work centering device 3 of the present invention is not limited to being attached to the reversing device 1, but can be used as a standalone work centering device. That is, the work centering device 3 of the present invention can be configured such that a pair of centering vises 12 for gripping both sides of the workpiece W in the Y direction are provided on the base 11 so as to be movable in the Y direction, and a pair of jaws 14 for gripping both sides of the workpiece W in the Z direction are provided on the centering vises 12 so as to be movable in the Z direction.

[0060] The present invention is not limited to the embodiments shown above. For example, the lateral movement means 15 and the vertical movement means 16 are not limited to screw means but can be driven by a fluid pressure driven cylinder device. Also, the motor is not limited to an electric motor but may be a hydraulic motor.

[0061] The scope of the present invention is indicated by the claims rather than the above description, and all modifications within the meaning and scope equivalent to the claims are included. [Explanation of symbols]

[0062] Double job 1. Inverting device 2. Reversal section 3. Work Centering Device 4 Web 5 Flange 6 Fixed-mount frame 7 Mobile Unit Frame 8 Guide rails 9 wheels 10 Table lifts 11 Base 12 Centering vise 13 Clamping surface 14 Joe 14a Mobile Jaw 14b Fixed jaw 15 Lateral movement means 15a Horizontal screw shaft 15b Nut 16. Means of vertical movement 16a Vertical screw shaft 16b Slider 17 Lifting section 18 Lifting and lowering means 18a Ball screw 18b Lifting motor 18c Gas Balancer 19. Reversing motor 20 Receiving Block 21 Stand 22 rails 23 Laura 24 Spacers

Claims

1. In a workpiece centering device, a pair of reversing devices are arranged along the X-axis in a plan view, each reversing device having a reversing part that rotates around the X-axis, and the reversing part is provided to clamp both ends of the workpiece in the X-direction, A base is provided in the reversing portion. A pair of centering vises that clamp both sides of the workpiece in the Y direction are provided on the base so as to be movable in the Y direction, The centering vise is provided with a pair of jaws that are movable in the Z direction and grip both sides of the workpiece in the Z direction. A workpiece centering device in which at least the upper of the pair of jaws is provided to be movable in the Y direction.

2. The work centering device according to claim 1, wherein one of the pair of inversion devices has a fixed machine frame, and the other has a movable machine frame that can move in the X direction, and the inversion section is provided on both machine frames.

3. The base is provided with a lateral movement mechanism for bringing the pair of centering vises closer together and further apart. The workpiece centering device according to claim 2, wherein the centering vise is provided with a vertical movement means for bringing the upper jaw and the lower jaw closer together and further apart.

4. The lateral movement means consists of a lateral screw shaft provided at the base and a nut provided on the centering vise that screws onto the lateral screw shaft. The vertical movement means consists of a vertical screw shaft provided in the centering vise and a pair of sliders that are screwed onto the vertical screw shaft and move up and down. The work centering device according to claim 3, wherein the slider is provided with the upper jaw and the lower jaw.

5. The workpiece centering device according to claim 4, wherein the horizontal screw shaft and vertical screw shaft have right-hand threads and left-hand threads formed on both sides from their central portion.

6. The work centering device according to claim 5, wherein a motor is provided to drive the horizontal screw shaft and the vertical screw shaft.

7. The workpiece centering device according to claim 3, wherein the lateral movement means and the vertical movement means are driven by a fluid pressure driven cylinder device.

8. The workpiece is an H-shaped steel beam having a web and a flange. The aforementioned fixed machine frame and mobile machine frame each have a gantry frame and a lifting section that is provided to be movable in the Z-axis direction within the space of the gantry frame. The lifting section is provided with the reversing section, The aforementioned gantry frame is provided with a ball screw aligned with the Z-axis direction and a lifting motor that drives the ball screw, thereby configuring the lifting section to be able to move up and down. The work centering device according to claim 6, wherein the lifting section is provided with a reversing motor for driving the reversing section.

9. The work centering device according to claim 8, wherein the base is provided with a support block that supports the lower surface of the horizontal web of the H-shaped steel.

10. The workpiece centering device according to claim 6, wherein the workpiece is a press die.

11. At the base, a pair of centering vises are provided that are movable in the Y direction and clamp both sides of the workpiece in the Y direction. A workpiece centering device comprising a centering vise, wherein a pair of jaws for gripping both sides of the workpiece in the Z direction are provided so as to be movable in the Z direction.

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