JPS6239104A - Index gear mechanism in head exchange of multi spindle drilling machine - Google Patents

Abstract

PURPOSE:To shorten the time necessary for indexing and enhance the work efficiency by permitting free forward and reverse rotation of a hydraulic motor for head exchanging rotation with a solenoid operated valve and speedy turning movement of the desired head to be exchanged to a indexing position. CONSTITUTION:A hydraulic motor 5 is permitted to rotate forwardly and reversely by a non-illustrated solenoid operated valve and thus gears 4, 4', 4'', 4''' can be moved forwardly and reversely. The peripheral face of the gear is provided with circular notches 21, 21', 21'', 21''' for fitting a roller 19. In an indexing device 15, the tip of a lever 17 is provided with the roller 19. By a cylinder (not illustrated) for index positioning housed in a hydraulic unit 20, the roller 19 is fitted in the circular notch 21 and the desired head 3 to be exchanged is positioned. These operations are made automatically by a sequence circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indexing device for replacing the head of a multi-spindle drilling machine.

Figure 1 is a partial perspective view of the main parts of a conventional device.
2.2', 2', and 2'' are the columns, and 2.2', 2', and 2'' are the frame on which the interchangeable heads are mounted, which are rotated in a divided state (4 sections) via rails (not shown) in the circumferential direction surrounding the columns; 3 is the frame; The figure shows the state in which only one replacement head is installed. On the other hand, 4.4", 4°, 4" are the internal gears formed on the inner circumferential surface of the upper part of the frame, and 5 is the rotating head. Column 1 is a hydraulic motor for
The gear 6 at the tip of the motor shaft meshes with the internal gear to rotate it. On the other hand, 7 is a stopper rod attached to the side of the column opposite the hydraulic motor 5), and is capable of vertical movement at a constant height on the rotation locus of the internal gear 2 through the bracket 8. It is supported as if it were being shot downwards. In addition, 9a and 9b are limit switches that detect the vertical movement of stopper FF7, and 10
．． 10', 10', and 10'' are retaining pins fixed on each divided internal gear.

When the swing hydraulic motor 5 is driven with the above configuration, the frame supports the exchange head 3 and rotates in the direction of arrow (A) in the illustrated example, and during this rotation process, the engagement pin one (10 in the illustrated example) contacts the lower end of the stopper rod 7 and slides on the tapered surface of the retaining pin 10 to move it up and down.At this time, the limit switches 9a and 9b are activated. Change the rotation of the motor 5 to reverse rotation.

By the way, in the reverse direction, since the retaining pin does not have a tapered surface, the back surface of the engaging pin 10 and the stopper rod 7
The head comes into contact with the head and stops, and the head position is thereby determined.

In the conventional type mentioned above, when the head itself becomes large or heavy, the inertia force during rotation is large, so there is a problem that the impact when reversed and stopped is large. Since these are also related to rotational speed, the rotational speed cannot be increased, and therefore rapid and accurate replacement cannot be performed, which poses a problem in improving performance.

The present invention is an attempt to solve the existing problems.According to the present invention, since the head can be freely rotated in either the clockwise or counterclockwise direction, it is possible to move the desired replacement head to the index position. It can be rotated quickly and even a heavy head can be positioned smoothly and accurately.

An example of implementing the present invention will be described below based on the drawings.

FIG. 2A is a front view showing the entire device, and FIG. 2B is a partial perspective view of the main parts, where ■ is a column, 2.21, B, r is a frame for mounting the exchange head, 3 is an exchange head, and 4. 4゛、41
．． 4″ is an internal gear, 5 is a swing hydraulic motor, 6
is the same as the conventional example in that the gear at the tip of the motor shaft meshes with the internal gear and rotates it. In addition, 11 is a power unit constituting the driving part of the cutting tool attached to the interchangeable head when joining the interchangeable head, 12 is a motor for transmitting the cutter mouth, and 13 is a power unit feed motor, in which the power unit 11 and the interchangeable head 3 are integrated. The workpiece is sent along the column axis b' toward the workpiece (not shown) on the bed 14, and these structures are also the same as in the conventional example.

15 is an indexing device used in the present invention, in which a horizontal lever 17 is swingably provided via a pin 18 to a bracket 16 formed protruding from one side of the column 1; is provided with a freely rotating roller 19, the rear end of which is connected to a piston of a manual indexing and positioning cylinder built into a hydraulic unit 20 fixed to the back surface of the bracket 16. The roller 19 at the tip of the lever rotates while partially contacting the outer circumferential surface of the internal gear opposite to the tooth surface, and is secured to the outer circumference and surface side of each divided internal gear. In place of the pin, cutout circles 21, 21', 21°, and 21°1 are provided into which the rollers are engaged and fitted. In the drawings, 22, 22', 22", and 22" are limit switches fixed on the column 1 side, and the dogs that come into contact with each of these limit switches in sequence support the head and rotate the replacement head. It is installed inside the mounting frame. (Not shown) FIGS. 3A and 3-D are action explanatory diagrams including the hydraulic circuit, and in each figure, 25 is an indexing and positioning cylinder;
26 is a solenoid valve for its operation; 27 is a clamp cylinder for actuating one of the replacement heads to join and secure it to the power unit l-11 at the index position; 28
29 is a solenoid valve for switching the swing hydraulic motor 5 between forward and reverse directions, and 29 is a hydraulic pump (not shown).
30 is an oil return pipe to an oil tank (not shown). Incidentally, a~〈　 are boats for oil spillage and inflow.

Figure A shows one of the interchangeable heads clamped in the indexed position. Specifically, the oil from the hydraulic pump passes through the oil inflow pipe 29 and flows from the boat 1 of the solenoid rope 26 to h.
Flowing like an arrow, the index positioning cylinder 25
Now, press the back of the piston from boats b and υ and move the piston in the direction of the arrow (b) to release the lever 17.
Rotate the roller in the direction of arrow C4 using the pin 18 as a fulcrum, and
9 and the cutout circle 21 are made to fit together. At this time, part of the oil branched from the oil inflow pipe 29 flows inside the cylinder 25 into the boat d during the movement of the piston.
This flows into the cylinder 27 from the boat d in the clamp cylinder 27, and the piston is suppressed upward from the lower surface so that a shift ramp is performed.

On the other hand, during the above-mentioned movement, the oil on the opposite side of each piston flows from the hoards a and a' in the indexing and positioning cylinder 25 to the boats j and k of the solenoid valve 26, and in the clamp cylinder 27 from the boat m to the indexing and positioning cylinder 25. The oil returns to the return pipe 30 connected to the oil tank via boats e and f. In the drawing, reference numeral 31 indicates a limit switch for confirming completion of the indexing operation, and 32 indicates a limit switch for confirming clamping, and when these switches are operated, the solenoid valve 28 is switched to neutral (as shown in the example). Figure B shows the state when the replacement head is rotated by a new rotation command, and first, the forward rotation of the replacement head is performed by solenoid valve 2 based on the reverse rotation command.
The spool No. 8 moves as shown in the illustrated example. (The illustrated example shows forward rotation.) Also, the spool of the solenoid valve 26 moves in the same manner.

As a result, the oil from the oil inflow pipe 29 is transferred to the solenoid valve 2.
6, it flows through boats i and j, and then in the indexing and positioning cylinder 25, the piston front part is pressed from ports a and a', the piston is moved in the direction of the arrow), and the lever 17 is moved in the direction of the arrow ) direction, roll 19
and the notched circle 21 are disengaged from each other. By the way, a part of the oil branched from the oil inlet pipe 29 due to the movement of the piston in the direction indicated by the arrow) passes from the boat d to the boat e, and is transferred from the boat m of the clamp cylinder 27 to the piston in the cylinder from above to below. This will release the flanged state between the power unit and the replacement head. During the downward movement of the piston, the oil reaches the solenoid valve 28 from the boat n, passes through the boat p of the valve, and drives the hydraulic motor 5 for rotation, causing the hydraulic motor to rotate in the normal direction. ``With one movement, another replacement head rotates to the bottom of the power unit.

Figure C shows the state just before the indexing of another exchange head, that is, when another exchange head approaches directly below the power unit due to the drive of the swing hydraulic motor 5, the exchange head attachment rotates to support the other exchange head. A dog in the frame contacts one of the limit switches 22. In the indexing cylinder 25 through port h, it flows from ports b and b' and presses the back surface of the piston, moving the piston in the direction of arrow (b), thereby rotating the lever 17 in the direction of arrow C1. The rollers 19 come to roll while contacting the outer peripheral surface of the internal gear.

As the piston moves in the direction of the arrow (B), the oil from the hydraulic motor 5 is transferred to the port Q of the solenoid valve 28.
, R to the indexing and positioning cylinder 25, and when the oil is returned to the oil inlet pipe through ports y to r of the cylinder, the oil amount is gradually throttled and reduced by the inclined surface 33 formed on the sgur surface. This is done by lowering the transmission speed of the motor 5 for turning and gradually slowing down the travel speed of the exchange head, and the automatic braking action works to rotate the rollers 19. It will be inserted into the new notch 21" that is coming. At this time, the notch 2
A radius 0 is formed on the edge of 11 to ensure smooth fitting and securing. The movement of the piston also changes the oil from the oil inflow pipe 26 from the port d to the port C, and from the port l of the clamp cylinder 27 to an inflow that presses the lower end of the piston of the cylinder.
The piston is raised, thereby clamping the power unit 11 and the newly rotated replacement head. The clamping is completed at the upper limit of the piston in the clamp cylinder, and at the same time, the limit switch 32 is operated to switch the spool of the solenoid valve 28 to the neutral state. (See Figure A) In this way, the indexing setting of another exchangeable head is performed in this way, and when the machining work with the tool attached to the head is completed, the roller 19 and the notch 21° at the tip of the lever are
The piston of the clamp cylinder begins to move downward as the engagement with the clamp cylinder is disengaged, and the same operation as described above is repeated.

The above-mentioned series of operations are automatically performed based on a sequence circuit built into the control box, and the operator simply presses the initial start switch and everything is performed automatically.

In the above embodiment, the replacement head is replaced by rotating the IA reuse momo in the normal direction, but D is an example in which the replacement head is replaced in the reverse direction, and is carried out in the same manner as described above.

The present invention is constructed as described above, and whether to rotate the motor in the forward direction or in the reverse direction when replacing the head depends on the desired head being replaced at that time.4:
Since this can be set in advance depending on the machining operation, it should be incorporated into the sequence circuit as appropriate.

The present invention is configured as described above, and even if the head becomes large or heavy, the problem of increasing inertia force can be solved and the operation can be carried out smoothly. Since indexing is performed only in one direction, the time required for indexing is long; however, with the present invention, since both forward and reverse rotation can be performed freely, the time required for indexing can be shortened. It can be carried out efficiently, and work performance can be dramatically improved.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of the main part of the conventional device, Fig. 2 and the following shows the device of the present invention, Fig. 2A is a front view showing the entire device, and Fig. 2B is a partial perspective view of the main part. FIGS. 3A to 3D are explanatory diagrams of the operation including the oil passage. 1... Column 2.21.21, 211. ,, Replacement head is installed on frame 3 ... Replacement head 4.4', 4', 41' ・
・・Internal gear 5・・Hydraulic motor for power saving
6 ・Gear 7-= Stroke lever 10.10
', 10', 10'' - Engagement bin 11 ... Power unit 15 ... Indexing device 17
,・Horizontal lever 190. Colo 21.21',
21', 21''',...notched circle 22.22', 22'
, 2 Limit switch 25 ・ Index positioning cylinder 26 ・ Solenoid valve
27 ・ Clamp cylinder 28 ・・
Solenoid valve 29...Oil inflow pipe 30...
oil return pipe

Claims (3)

[Claims] (1) An interchangeable head mounting frame that supports the interchangeable head while being divided into a plurality of sections in the circumferential direction surrounding the column, in which a hydraulic motor fixed to the column side engages with an internal gear at the top of the frame. Further, on the opposite outer circumferential side of the internal gear, an arc-shaped notch is provided for each of the divided sections, and one of the notches is pivotally supported by a bracket from the column side. A lever of a certain length is swingably arranged through a pin, and a roller that engages with the notch is attached to the lower end of the lever, and the opposite end of the lever is connected to a piston of an indexing and positioning cylinder. On the other hand, an oil passage is formed on the outer peripheral surface of the cylindrical body of the piston, so that a spooling action for the valve against the clamp cylinder is performed during the movement of the piston, and a replacement head is formed along with the engagement and disengagement action of the rollers and notches. The oil path of the clamp cylinder is switched to clamp or unclamp the power unit, and in connection with the clamping or unclamping, the solenoid valve for operating the hydraulic motor is switched, so that the hydraulic motor stops or rotates. An indexing device for replacing the head of a multi-spindle drilling machine, characterized in that it is configured to do the following: (2) The multi-spindle drilling machine according to claim 1, characterized in that the spool of the solenoid valve for operating the hydraulic motor moves left and right, so that the hydraulic motor rotates forward or reverse. Indexing device for head replacement. (3) In the process in which the oil from the hydraulic motor passes through the oil path created in the indexing and positioning cylinder and returns to the oil tank, the amount of oil returned can be changed by moving the piston inside the cylinder. An indexing device for head exchange of a multi-spindle drilling machine according to claim 1.