JPH09207011A - Guide bar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform jump-out and pull-in of a push plate during change of a tool without depending on an energizing spring to energize a guide bar. SOLUTION: A bush plate 14 in which a bush 16 is fitted is arranged at the tip of a guide bar 19 and a cylinder 24 to move forward and backward the guide bar 19 is arranged. A hook 29, a contact member 30, and an energizing spring 31 are inserted in the staged hole 27 of the guide bar 19. During normal use, the bush plate 14 is energized through the force of an energizing spring 31 and during change of a tool, the energizing spring 31 is held by the hook 29 and the contact member 30 and the bush plate 14 is relatively moved forward and backward to and from a body 7 by the cylinder 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide bar device for guiding a tool mounted on a spindle during machining of a workpiece and for moving a bush plate back and forth relative to the spindle during tool replacement.

[0002]

2. Description of the Related Art As a guide bar device for a gang head which is indexed to a predetermined processing position by a conventional turret device, there is one shown in FIG. 5, in which a main shaft 8 to which a tool 11 is attached is rotatable. 7 is provided. The gang head body 7 includes a guide bar device 1
3 are provided. In the guide bar device 13, the guide bar 19 is inserted into a guide member 25 that guides the guide bar 19, and the guide bar 19 is biased forward by the biasing spring 31 with respect to the gang head body 7. A bush plate 14 is fixed to the tip of the guide bar 19, and a bush 16 is attached to the bush plate 14. Further, the gang head main body 7 is provided with a hook 29, and the pin 33 provided on the bush plate 14 comes into contact with the hook 29 at the regulation position by the spring force of the biasing spring 31 when the bush plate 14 is not processed. When the workpiece W is started to be machined, the gang head body 7 moves forward together with the bush plate 14, the bush plate front surface 14a contacts the jig 17, and the gang head body 7 moves further forward. While bending the spring 31, the tool 11 is guided by the bush 16 to process the work W. When changing the tool, the hook 29 is removed from the pin 33, and the bush plate 14 is pushed forward relative to the gang head body 7 from the regulation position by the spring force of the biasing spring 31, and the tool 11 is pulled out from the bush plate 14 to remove the tool. Replace 11

[0003]

In the above-mentioned conventional guide bar device, the tool exchange is often performed at the machining position where the tool faces the work. When a worker operates a hook, when multiple machine tools are installed as a machining line, the machine often enters the machining position from the rear of the machine tool. It is difficult for an operator to enter the processing position to remove it, and in the turret device, the tool of the gang head often projects in the left and right direction of the turret device, so it is extremely dangerous to enter the processing position. There was a problem. Therefore, tool exchange is safer and easier to work when the gang head is in a position other than the machining position.However, in the guide bar device having the above configuration, the gang head faces upward when it is not in the machining position. Therefore, in order to remove the hook and move the bush plate forward (that is, upward) with respect to the gang head, the weight of the guide bar, bush plate, etc. is applied to the biasing spring, and a spring with a large force to push up the bush plate is used. However, if the spring force of the biasing spring is increased for this reason, a large spring force will be applied to the bush plate that is stopped by the jig during machining of the workpiece, and the bush plate will be distorted, resulting in poor machining accuracy. There was a problem of lowering.

[0004]

In order to solve the above-mentioned problems, the present invention provides a guide bar with a piston and a cylinder chamber in which the piston slides in the gang head body, and the guide bar is provided with the gang head. A biasing spring is urged in front of the main body, and during normal use (except when changing tools), the guide bar (that is, the bush plate) and the gang head main body are moved relative to each other within the range of expansion and contraction of the spring to change tools. Occasionally, the guide bar, that is, the bush plate, is moved forward by the cylinder from the restricting position where the gang head body is most distant from the restricting position during normal use to the tool changing position further forward.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a guide bar device for a bush plate used in a turret device for indexing a gang head at a predetermined processing position.
The bush plate is provided with a bush and a guide bar that is biased toward the front of the gang head body by a bias spring, and has a hook that restricts the forward bias of the bush plate toward the gang head body when the workpiece is machined. In a guide bar device that guides a tool by a bush and moves the bush plate back and forth relative to the main shaft, a piston is provided in the guide bar and a cylinder chamber in which the piston slides is provided in the gang head body. In the normal use, the bush plate is moved back and forth between a restriction position where the hook prevents the protrusion of the bush plate due to the spring force and a tool exchange position in front of the restriction position.

When the tool is replaced, the biasing spring is constructed so that it can be held by a hook at a restricting position so that the spring force of the biasing spring does not act on the movement of the bush plate. This is realized by holding (locking) the contact member that contacts the stepped portion of the bar on the hook of the central shaft that is integral with the gang head body.

[0007]

EXAMPLE An example of the guide bar device of the present invention will be described below with reference to FIGS. A plurality of turret devices (leaning tower type turret devices) 1 installed in parallel in a factory are provided with a slide body 3 slidably guided on a base 2 as shown in FIG. 1, and are fed by a motor M2. It is moved by screws (not shown). A revolving unit 4 is rotatably supported on the slide unit 3 by a motor M1 so as to be indexably rotatable around a head support shaft 5 inclined with respect to the base 2. A plurality of gang heads 6 are radially provided on the outer peripheral surface of the revolving unit 4. The gang head 6 indexed to the machining position facing the work W by the rotation of the revolving structure 4 is positioned parallel to the base 2 and faces the work W.
The gang head 6 having a phase difference of 180 degrees is positioned perpendicular to the base 2. These gang heads 6 are configured as follows. As shown in FIG. 2, a plurality of main shafts 8 are rotatably supported by a gang head body 7 by bearings 9. A tool 11 such as a drill is provided by a tool holder 10 at the tip of the spindle 8. A motor M1 is provided at the rear of the gang head body 7.
An input shaft 12 connected to the main shaft 8 is projected, and the driving force of the motor M1 is transmitted from the input shaft 12 to each main shaft 8 via an appropriate gear train to rotate each main shaft 8. A pair of guide bar devices 13 are provided on the left and right sides of the gang head body 7.

Next, the guide bar device 13 will be described. Bush mounting portions 15 are provided on the front surface 14a of the bush plate 14 at positions facing the main shaft 8, and bushes 16 for guiding the tool 11 to the work W are fitted to the bush mounting portions 15. Further, below the bush plate front surface 14a, as shown in FIG. 3, there is provided an abutting portion 18 that abuts a jig 17 on which the work W is mounted and restricts the forward movement of the bush plate 14. The bush plate 14 is integrally fixed to the tips of the pair of left and right guide bars 19. A piston 20 is provided at the rear end of each guide bar 19, and the rear portion of the guide bar 19 is covered with a cylinder tube 21.
A rear wall 22 is fixedly attached to the rear end of the cylinder chamber 23 to form a cylinder 24. A guide member 25 that slides and guides the guide bar 19 in the front-rear direction relative to the gang head body 7 is connected to the front portion of the cylinder 24, and the cylinder 24 and the guide member 25 are fixed to each other.
6 is integrally fixed to the gang head body 7.

A stepped hole 27 is formed at the center of the guide bar 19, and the stepped hole 27 includes a small diameter portion 28a and a large diameter portion 28b, and a hook 29 is provided at the tip of the small diameter portion 28a. The central shaft 28, in which the rear end of the large diameter portion 28b is screwed into the rear wall 22 of the cylinder 24, is inserted. The hook 2 is attached to the small diameter portion 28a of the central shaft 28.
9 and a large diameter portion 28b are fitted with a contact member 30 slidable between them, and a biasing spring 31 for biasing the contact member 30 forward between the contact member 30 and the rear wall 22 of the cylinder 24. Is intervening. The predetermined stroke S2 of the piston 20 sliding in the cylinder chamber 23 is longer than the normal stroke S1 in which the abutting member 30 can slide on the small diameter portion 28a during normal use for processing the work W, and the guide bar 19 moves forward to advance to the bush plate. Tool 14 when 14 jumps to the tool change position
Is set to a length such that the tip of the is removed from the bush plate 14. Reference numerals 32a and 32b denote inlets and outlets of compressed fluid (compressed air) to and from the cylinder chamber 23 before and after the cylinder 24, 34 is a compressed air source, and 35 is a switching valve.

When the processing of the work W is started, it is located at the position B with respect to the bush plate 14 in FIG.
The gang head main body 7 in a positional relationship in which 0 is in contact with the stepped portion 27a and restricts the protrusion of the bush plate 14 by the spring 31 advances toward the work W, and the contact portion provided in the bush plate 14 18 contacts the jig 17, and the forward movement of the bush plate 14 is stopped. When the gang head body 7 further advances, the tool 11 is guided by the bush 16 to process the work W. At this time, the guide bar 19 moves back relative to the gang head body 7 against the spring force of the biasing spring 31, the piston 20 moves to the rear part of the cylinder chamber 23, and the contact member 30 moves to the stepped hole 27. The normal stroke S1 is slid rearward along the small diameter portion 28a while being in contact with the stepped portion 27a, and the state shown in FIG. When the processing of the work W is completed, the gang head body 7 is retracted with respect to the work W. Then, first, only the gang head main body 7 is retracted, and the guide member 19 slides forward along the small diameter portion 28a while the contact member 30 is biased by the contact member 30 biased by the biasing spring 31. When it comes into contact with the piston 29 as shown by the chain double-dashed line in FIG. While the bush plate 14 is held at the restricting position in front of the guide member 25 shown by the chain double-dashed line in FIG. The part 18 separates from the jig 17, and the gang head body 7 retracts to the original position.

The pressure of the compressed air supplied from the supply port 32b to the cylinder chamber 23 is obtained from the sliding resistance of the guide bar 19, and the gang head body 7 retracts and the spring 31 is held by the hook 29 to guide the spring force. When the gang head main body 7 is further retracted, the guide bar 19 does not affect the bar 19 and is located at the regulation position.
Is set to retract with the gang head body 7 in the restricted position. Further, the supply / discharge port 32a is always open to the atmosphere during normal use. Of course, if there is a resistance between the guide bar 19 and the guide member 25 that causes the gang head body 7 and the guide bar 19 to retreat while being positioned at the regulation position, compressed air may not be supplied from the supply / discharge port 32b.

The tool is changed at an indexing position (a position where the gang head 6 is perpendicular to the base 2 in FIG. 1 in the embodiment of the present invention) different from the machining position where the gang head 6 faces the work W. . At the time of tool exchange, the hook 29 comes into contact with the hook member 30 at the regulation position (position of the bush plate 14 with respect to the gang head body 7 at the position B in FIG. 4).
Is held, the switching valve 35 is switched, compressed air is supplied to the rear cylinder chamber 23 from the supply / discharge port 32a of the rear wall 22, the piston 20 is pressed, and the guide bar 19 is guided by the guide member 25. The bush plate 14 moves from the restricting position with respect to the gang head body 7 to the tool replacement position (the position of the bush plate 14 with respect to the gang head body 7 at the position C in FIG. 4). Then, when the tool 11 is replaced, the switching valve 35 is switched again to supply / discharge the port 32.
Compressed air is supplied from b, the bush plate 14 is again positioned at the regulating position, and the switching position of the switching valve 35 is maintained as it is. When the gang head 6 is in the indexing position different from the machining position, the tool is changed by advancing the bush plate 14 to the tool changing position by the cylinder 24.
The tool does not have to be in the machining position, which reduces the risk and facilitates tool replacement. Also, bush plate 1
4 for advancing 4 to the tool exchange position
It is possible to use an urging spring having a weak spring force because it is performed by the cylinder 24 that is integrally provided to the bush plate 14. When the bush plate 14 comes into contact with the jig 17 during processing, the bush plate 14 is distorted by the spring force. The tool 17 can be guided with high accuracy. In the embodiment of the present application, the turret device having a plurality of gang heads on the outer peripheral surface of the revolving structure has been described.
At the same time, a balance for stabilizing the swing of the swing body may be attached to the remaining outer peripheral surface.

[0013]

As described above, according to the present invention, when the tool is exchanged, the bush plate is forced out of the gang head body forward by the cylinder, so that the bush plate is forced out. A spring with a large force is not required to move the bush plate even when exchanging tools in a state where the bush plate is indexed to other than the upper side, and when the bush plate comes into contact with the jig during machining, the bush force is generated by the spring force. The plate is not distorted and the tool can be guided with high accuracy. Further, since the tool can be exchanged at a position different from the machining position, the worker can work more safely than before.

[Brief description of drawings]

FIG. 1 is a side view of a turret device.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front view of a gang head including a guide bar device.

FIG. 4 is an explanatory view showing positions of a bush plate and a gang head body.

FIG. 5 is a conventional guide bar device.

[Explanation of symbols]

7 Gang Head Main Body 8 Spindle 13 Guide Bar Device 14 Bush Plate 16 Bush 19 Guide Bar 20 Piston 21 Cylinder Tube 22 Rear Wall 23 Cylinder Chamber 24 Cylinder 25 Guide Member 27 Stepped Hole 27a Step 28 Center Shaft 28a
Small diameter part 28b Large diameter part 29 Hook 30 Contact member 31
Biasing spring

Claims (3)

[Claims] 1. A guide bar device for a bush plate used in a turret device for indexing a gang head to a predetermined machining position, wherein the bush plate is urged toward the front of the gang head body by a bush and an urging spring. Guide bar and a hook that restricts the forward movement of the bush plate toward the gang head body by the biasing spring of the bush plate.The bush is guided during machining of the workpiece, and the bush plate is relatively moved with respect to the spindle. In a guide bar device that is configured to move back and forth, a piston is provided in the guide bar and a cylinder chamber in which the piston slides is provided in the gang head body,
A guide bar device characterized in that the bush plate is moved back and forth between a restriction position where the hook plate restricts the protrusion of the bush plate due to the spring force during normal use and a tool exchange position in front of the restriction position. . 2. When the bush plate is moved to the tool exchange position, the biasing spring is held by the hook at the restricting position so that the spring force does not affect the guide bar. The described guide bar device. 3. A cylinder is formed by forming a bush plate having a bush attached to the tip of the guide bar, providing a piston at the rear end of the guide bar, and forming a cylinder chamber by covering the rear portion of the guide bar with a cylinder tube. A guide member that guides the guide bar at the front part of the gang head body is provided, and a stepped hole is provided at the center of the guide bar. The stepped hole has a large diameter portion and a small diameter portion, and the small diameter portion has a hook. The large diameter part is inserted into the rear wall of the cylinder chamber, the center shaft is inserted, and the abutting member is slidably fitted to the small diameter part of the central shaft. With a bias spring interposed between them, the contact member is set to have a predetermined stroke longer than the normal stroke that allows the contact member to slide along the small diameter portion during normal use. The abutting member that is in contact with the portion and is urged by the urging spring at the regulation position when the tool is replaced is held by the hook, and the bush plate is movable by the cylinder to the tool replacement position. The guide bar device according to claim 2.