JPH074683B2 - Machine tool front and back processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a front and back machining process of a workpiece by a single machine tool, and more particularly to a workpiece feeding and conveying system for simultaneous machining.

(Prior Art) When the front and back of a workpiece are simultaneously machined by a machine tool such as a lathe, it is common to perform machining with two machine tools. It becomes complicated, the floor space required increases, and the price increases. To improve this, as shown in FIG. 7, two spindles (Ha) and (Hb) for gripping the workpiece are opposed to each other, and the workpiece (W) is placed between the spindle (Ha) and the spindle (Hb). There is one that is equipped with a handling device.

This handling device moves independently in two axial directions on a moving table (E) that can move in the axial direction of the main spindle, and can transfer work between conveyors (Ca) and (Cb). Arms (Aa) and (Ab) that can rotate like this are provided.

In this operation, the arm (Aa) grabs the unprocessed workpiece (W) from the conveyor (Ca), and the arm (Ab) chucks the spindle (Ha) to finish the front side machining (W). ), Then chuck the unprocessed work (W) to the spindle (Ha) with the arm (Aa),
The work (W) that has undergone the primary processing is passed from the arm (Ab) to the arm (Aa), and the work (W) that has been machined on the back side by the secondary processing is taken out from the spindle (Hb) by the arm (Ab). The work (W) on which the primary processing of the arm (Aa) is finished is placed on the conveyor (Cb) and chucked on the spindle (Hb).

(Problems to be Solved by the Invention) In the above-described machining method, since the machining start time and the machining end time are always different between the primary machining and the secondary machining, and the machining cannot be performed simultaneously, the handling device, the spindle and the tool feed The sequence control for determining the procedure is complicated, and it takes time to shorten the time for one cycle.
Separately from this, a supply arm is pivotally mounted in front of each of the two main shafts, chucks are provided at both ends of the supply arm, and a work piece is transferred between both supply arms so as to be rotatable by 90 °. An automatic work reversal transfer device provided with a transfer chuck and a receiving chuck is disclosed in JP-A-59-47102. However, this work reversal transfer device repeats a large number of gripping and releasing operations of the chuck by the chucks at both ends of the pair of supply arms, the transfer chucks, and the receiving chucks. Since it is used a lot, it takes a very long time to transfer the work, and it is not possible to transfer and reverse the work at high speed. The present invention eliminates the above-mentioned drawbacks and simultaneously performs primary processing with a simple configuration. Another object of the present invention is to provide a front and back processing system for a machine tool that can reversely transfer a work at high speed and can increase the processing speed.

(Means for Solving the Problems) The configuration of the present invention is as follows: 1) One carriage is provided on one bed, and two spindles are arranged in parallel in the headstock in the same direction. In a machine tool equipped with a tool rest and a tool for simultaneously machining workpieces held by each spindle,
A handling device that supplies one work to each main shaft is provided, and the direction of the work is reversed during the transfer, and a transfer device that sends the work processed by one main shaft to the handling device that supplies the other work. A feeding chute that includes a reversing device and that feeds the work to the handling device that feeds the work to the first spindle, an intermittent feeding device that is provided between the feeding chute and the handling device, and a feeding chute that is taken out from the first spindle. A receiving chute that receives the work and sends it to the elevator, an elevator that raises the work upward, a conveyance chute that sends the work from the elevator to the reversing device, and a supply chute that sends the work from the reversing device to the second spindle handling device, the second chute. Front and back machining system for machine tools consisting of a receiving chute for receiving the workpiece taken out from the spindle ) The front and back processing system of the machine tool according to the above 1), wherein the locking lever of the intermittent feeding device is pushed down by a push rod fixed to the piston of the handling device. 3) The scraper of the elevator is lowered in the direction away from the headstock. The machine tool front and back processing system according to the above 1) which is inclined to 4) The work piece outlet provided above the side wall of the elevator away from the headstock of the elevator is connected to a curved portion curved toward the headstock. 1) The machine tool front and back machining system according to 1), which is provided with a transport chute. 5) The machine tool front and back machining system according to 1), in which the turntable of the reversing device is tilted higher toward the transport chute side and lower toward the supply chute side. 6) A V-block in which the handling device receives the work from the supply chute in the V-shaped groove portion, and the V-block. The front and back processing system for a machine tool according to any one of 1) to 5), which includes a moving mechanism that moves the workpiece from the workpiece receiving position to the front position of the spindle, and a pusher that passes the workpiece on the V block to the chuck of the spindle. is there.

With this configuration, the unmachined surface of the workpiece is always directed to the tool post side on the two spindles, so that the spindle rotation and tool feed can be started at the same time, and complex machining processes are simple. It can be done by sequence control.

(Example) Hereinafter, the Example which shows this invention in a figure is demonstrated.

Fig. 1 is a front view of the machine tool spindle seen from the axial direction,
The figure is a side view. The headstock (1) has two first spindles (11
a) and the second main spindle (11b) are oriented in the same direction and the central axes are parallel to each other, and chucks (12a) and (12b) are attached to the main spindles (11a) and (11b), respectively. It is designed to grab (W). Spindle (11a), (11b)
The handling device (2a), (2b) is installed on the upper part of the cylinder, and the piston (211) of the vertically extending cylinder (21)
Project at both ends, and a V block (21
2) and pusher (213) are attached and the spindle (11
Unworked work (W) sent from supply chutes (3a), (3b) that are installed so as to descend toward (a)
Is received and gripped by the V block (212), and the piston (2
The work (W) is moved to the center of the spindle (11) by means of (11) and is loaded into the chuck (12) by means of the pusher (213). A push rod (215) is attached to the end above the piston (211) via a plate (214) and pushes down the locking lever (41) of the intermittent feeding device (4) to supply the feed chutes (3a), ( The stoppers (42) and (43) are alternately moved up and down so that the works (W) sent from 3b) are sent to the V block (212) one by one. Locking lever (41) is spring (44)
By this, force is applied in the direction in which the stopper (42) is lowered. The main chute (11a) side receiving chute (5) is provided in the lower part of the elevator (6) and is extruded below the main shaft (11a) by the piston (51). After the machining, the work is extruded from the chuck (12a). It receives (W) and sends it to the elevator (6). Pulleys (61), (62) provided on the upper and lower ends of the elevator (6)
The belt (63) is wound around, and the pulley (61) is rotated by the drive motor (64), and the scraper (65) is installed on the belt (63) so as to be lowered in the direction away from the headstock. Is moved upwards. The scraper (65) receives the work (W) sent from the receiving chute (5) through the entrance (67) provided in the side wall (66) and sends the work (W) upward, and the scraper (65) above the elevator (6). From the outlet (69) provided on the side wall (68) on the lower slope,
The work (W) is sent to the curved portion (71) at one end of the transfer chute (7) by gravity. Curved part (7
1) is the headstock (1) of the elevator (6) for the work (W)
The direction is smoothly changed from the side wall (68) away from the head to the headstock (1) without any special actuator. The other end of the transfer chute (7) is the main shaft (11b)
It is provided so as to be inclined toward the side so that the work (W) is fed by its own weight. A reversing device (8) for changing the direction of the work (W) is provided between the transport chute (7) and one end of the supply chute (3b). The reversing device (8) has a base (81) mounted over the lower surfaces of the transfer chute (7) and the supply chute (3b), a reversing motor (82) provided on the base (81), and a transfer chute (8). And a turntable (83) on which the work (W) sent from 7) is placed. The turntable (83) is high on the side of the transfer chute (7) and low on the side of the supply chute (3b) so that the turntable rotates. It is installed. The turntable (83) is provided with a groove (84) and a transfer chute (7)
The work (W) sent from the
2) Rotate the turntable (83) to change the direction of the work (W) around the axis of the reversing motor (82),
The turntable (83) is provided with a work (W) detector (85) for confirming that the work (W) has entered the groove (84).

One end of the supply chute (3b) connected to the reversing device (8) forms a curved portion (31b), and the work (W) is fed by its own weight from the curved portion (31b) toward the other end. And the other end is at the position where the V block (212) of the handling device (2b) is pulled upward.
It is arranged to send in. Supply chute (3b)
The work (W) is stopped by the stopper (42) of the intermittent feeding device (4) on the main shaft (11b) side in the middle of. The receiving chute (9) is provided below the spindle (11b), and the piston (91) fixed to the stocker (10) finishes the secondary machining from the spindle (11b) (W).
It is pushed out to the position to receive. The stocker (10) receives the works (W) sent from the receiving chute (9) in the V-grooves (101) and arranges the works (W) by the piston in the direction in which the V-grooves are extended so that they are aligned. I'm pushing it forward. Spindle (11a), (11
A carriage (14) that can slide axially on the bed (13) is provided below b), and a cross slide (15) is mounted on the carriage (14) in a direction perpendicular to the spindle. It is provided so that it can slide. As shown in FIG. 3, on the cross slide (15), a plurality of tools (T1a), (T2a), (T3) for machining both the work (W) of both the spindle (11a) and (11b).
Turret (16) to which a), (T1b) and (T2b) are attached
a) and (16b) are provided.

Now, one side of the unworked workpiece (W) shown in FIG. 4 (a), that is, the front side, is subjected to primary machining with the spindle (11a) into the shape shown in FIG. 4 (b), and then with the spindle (11b). A procedure for performing the secondary processing on the back side of the work (W) shown in FIG. 4 (c) will be described.

First, the unworked workpiece (W) is continuously fed from one end of the supply chute (3a) to the spindle (11a) side, and stopped by hitting the stopper (42) of the intermittent feeding device (4). Then lower the piston (211) of the handling device (2a),
Locking lever (41) with push rod (215)
Press to release from the stopper (42) and release the stopper (4
2) Raise and lower the stopper (43), stop the work (W) with the stopper (43), and advance one work (W) forward. Next, the push rod (215) is lifted together with the piston (211) to separate from the locking lever (41), and the stopper (42) stops the next work (W) by the spring (44). At this time, the work (W) stopped by the stopper (43) starts from the other end of the supply chute (3a) to the V block (212) of the handling device (2a).
Sent on. Next, lower the piston (211) to V
The block (212) is stopped at a position where the work (W) coincides with the center of the chuck (12a), and the work (W) is pushed into the chuck (12a) by the pusher (213). At the same time, the locking lever (41) is pressed by the push rod (215), the stopper (42) rises, the stopper (43) lowers, and the next work (W) is stopped from the stopper (42) by the stopper (43). Moved to a position. Next, when the piston (211) is lifted, the work (W) to be processed next by the procedure described above is sent from the chute (3a) to the V block (212). By repeating the above operation, the work (W) is continuously supplied to the spindle (11a).

The work (W) put into the chuck (12a) of the main shaft (11a) and gripped is rotated and is primarily processed by any of the tools (T1a) to (T3a), and then the chuck (12).
It is pushed out from a) and sent to the receiving chute (5) moved below the chuck (12a) by the piston (51), and further received by the scraper (65) through the inlet (67) of the elevator (6). . The work (W) placed on the scraper (65) is carried upward by the rotation of the drive motor (64) via the belt (63) and sent from the outlet (69) to the carrying chute (7). Transport chute (7)
The work (W) sent to (1) is rotated or slid in the direction in which the transfer chute (7) is inclined, sent to the reversing device (8), and loaded into the groove (84). When the work detector (85) detects that the work (W) has been loaded into the groove (84), the reversing motor (82) detects the turntable (8) by the detection signal.
3) is rotated, the direction of the work (W) is changed, and it is sent to the supply chute (3b) by its own weight. At this time, the front side surface (Wa) of the work (W) that has been primarily processed faces the spindle (11b) side, and the unprocessed side surface, that is, the back side surface (Wb) that is secondarily processed is the tool post (16b) side. It is facing. The work (W) sent to the supply chute (3b) is stopped by the stopper (42) of the intermittent feed device (4) on the spindle (11b) side, and performs the same operation in synchronization with the handling device (2a). The work (W) is gripped by the chuck (12b) by the handling device (2b). The workpiece (W) gripped by the chuck (12b) is rotated by the spindle (11b), and the tool (T1
Secondary processing is performed by either b) or (T2b).

When the workpiece (W) is subjected to secondary machining on the spindle (11b), it is simultaneously machined with the primary machining on the spindle (11a),
Before machining, the position where the tool is attached to the tool rests (16a) and (16b) is determined from the machining dimensions and the axial distance between the spindles (11a) and (11b).

When the machining of the embodiment shown in FIG. 3 is started, the carriage (14) and the cross slide (15) are moved so that the tool (T1
A) is applied to the work (W) of the spindle (11a) to machine the track, and a tool (T1b) is applied to the work (W) of the spindle (11b) to machine the corner. After that, cross slide (15)
To move the tool (T2a) to the work (W) of the spindle (11a)
To cut the corner, and then move the cross slide (15) to move the tool (T3a) and (T2b) to the spindle (11a).
The seal groove of the inner diameter is processed by applying it to each work (W) in b). Tool for machining the seal groove of the work (W) (T3
a) and (T3b) are arranged offset from each other in the opposite directions from the center of the spindle, and the tool rest is moved to bring either one of the tools into contact with the inner peripheral surface of the workpiece (W) for internal diameter machining. In the meantime, the other tools are blanked. By this,
Correction can be added to each of the tools (T3a) and (T3b).

When the machining is completed, the work (W) is extruded from the chucks (12a) and (12b) by an extruding device (not shown) without stopping the rotation of the spindles (11a) and (11b), and the primary machining is completed ( W) is sent to the receiving chute (5), the work (W) after the secondary processing is sent to the receiving chute (9), and is further accumulated in the stocker (10).

As another embodiment of the handling device (2), the fifth embodiment
Explaining the drawing, a ring (21) fitted on a stop ring (216) provided on a piston (211) protruding upward and fitted to be slidable on the piston (211).
7) is provided, one end is fixed to the ring (217), the other end extends downward and is provided with a V block (212), and the middle part slides on the surface of the base (218) of the handling device (2). A loader slide (219) is provided. A spring (220) is provided between the upper end of the ring (217) and the plate (214), and when the piston (211) is lowered, the ring (2
The lower end of 17) hits the stopper (221) fixed to the base (218) to stop the movement of the loader slide (219), but the piston (211) is further lowered. A bifurcated push lever (221) is pin-connected at the center above the position where the V block (212) of the loader slide (219) is provided, and one end is lifted by a spring (222). . The piston (211) is lowered and the stop ring (217) is the stopper (221).
When the loader slide (219) is stopped, the piston (211) is further lowered, one end of the push lever (221) is pushed down, and the other end is the V block (212).
The work (W) placed on the above is pushed out and loaded into the chuck (12), and the work (W) is lowered and loaded into the chuck by one actuator.

A pressing lever (223) is supported at the lower part of the loader slide (219) to which the V block (212) is attached so that it can be rotated by a pin at the central part, and a pressing claw (224) is provided at one end. A tension spring (225) is provided between the other end and the loader slide (219), and the V block (212) is provided.
The work (W) placed on the work piece (W) is pressed by the holding claw (224) by the force of the tension spring (225). The other end of the presser lever (223) is pushed by the cam (225) when the loader slide (219) rises and the space between the presser pawl (224) and the V block (212) is opened to receive the work (W). , When the loader slide (219) descends, presser lever (2
23) is separated from the cam (225) so that the work (W) on the V block is held by the holding claw (224) together with the V block.

(Effect of the invention) As described above, according to the present invention, an unworked work (W) and a work (W) that has undergone primary processing are simultaneously fed to two spindles facing in the same direction, and at the same time. Since machining can be started and finished at the same time, the turret feed process simplifies the spindle speed change procedure, and the waiting time between processes between spindles is short, so the time for one cycle is shortened. Has the effect of.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a plan view of essential parts, FIG. 4 is a sectional view showing a processing sequence of workpieces, and FIG. FIG. 6 is a side view showing another embodiment, FIG. 6 is a front view of a main part, and FIG. 7 is a front view of a conventional example. (1): Headstock, (2): Handling device (4): Intermittent feed device, (6) Elevator (7): Conveying chute, (8) Reversing device (13): Bed, (14): Reciprocating table ( 41): Locking lever (65): Scraper, (71): Curved part (83): Turntable, (95): Receiving chute (3a), (3b): Supply chute (11a), (11b): Spindle ( 12a), (12b): Chuck (16a), (16b): Turret (211): Piston, (212): V block (213): Pusher, (215): Push rod (219): Loader slide (224) ): Work clamp, (W): Work piece

Claims (6)

[Claims] 1. A bed is provided with one carriage, two spindles are arranged in parallel in the headstock in the same direction, and a tool rest is provided on the carriage to grip each spindle. In a machine tool equipped with a tool for simultaneously machining processed workpieces, each spindle is provided with a handling device for feeding one workpiece at a time, and a workpiece machined by one spindle is sent to a handling device for feeding another spindle. A conveying device; and a supply chute that includes a reversing device that reverses the direction of the work during conveyance, and that conveys the work to a handling device that supplies the work to the first spindle.
An intermittent feeding device provided between the supply chute and the handling device, a receiving chute that receives the work taken out from the first spindle and sends it to the elevator, an elevator that raises the work upward, and a conveyance that sends the work from the elevator to the reversing device. A front and back machining system for a machine tool comprising a chute, a supply chute that feeds a work from a reversing device to a second spindle handling device, and a receiving chute that receives the work taken out from the second spindle. 2. The front and back machining system for a machine tool according to claim 1, wherein the locking lever of the intermittent feeding device is pushed down by a push rod fixed to a piston of the handling device. 3. A front and back machining system for a machine tool according to claim 1, wherein the scraper of the elevator is inclined so as to be lowered in a direction away from the headstock. 4. The work according to claim 1, wherein a conveyor chute having a curved portion connected to the headstock is connected to the work outlet provided above the side wall of the elevator away from the headstock. Machine front and back processing system. 5. The front and back machining system for a machine tool according to claim 1, wherein the turntable of the reversing device is inclined so that the conveyance chute side is high and the supply chute side is low. 6. A V-block and a V-block in which a handling device receives a work from a supply chute at a V-shaped groove portion.
6. A moving mechanism for moving the block from a work receiving position to a position in front of the spindle, and a pusher for delivering the workpiece on the V block to a chuck of the spindle.
The front and back processing system for a machine tool as described in