JPH0798281B2 - Loading device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a loading device for a two-spindle lathe.

2. Description of the Related Art Conventional multi-spindle lathes, for example, two-spindle lathes, when the same machining is performed on each spindle, or when one spindle is used to perform the first step and the other spindle is used to reverse the second step It is customary that the device lacks versatility because it has a complicated structure and it is difficult to deal with various works. For example, as in Jikkou Sho 61-19847,
2 It is known that the center of rotation is placed at the center of a circle with the same spindle position and discharge position, and three equiangular radial loader arms are arranged and the central arm is equipped with a reversing mechanism and a re-grip mechanism. . Furthermore, as a swing type loader, Japanese Patent Laid-Open No. 59-
There are 102501 and Jitsukai Sho 61-75901. In these products, the work of two main spindles is simultaneously changed with four change arms.

Problems to be Solved by the Invention In Japanese Utility Model Publication No. 61-19847, the standby position of the loader arm is close to the spindle chuck during machining, and the operation of the tool rest is restricted, and cutting chips and cutting fluid cause malfunctions. Also, when the reversing chuck of the central arm is rotated 180 °, it is not possible to accurately invert the work due to the length of the work, so it was necessary to change the work reference plane of the reversing chuck. JP 59-10
No. 2501 and No. 61-75901 are used to change the work of the 1st spindle and the 2nd spindle at the same time, so it is necessary to finish machining of both spindles at the time of replacement, and there is a difference in machining time. If there is, it is not efficient because it is waiting during that time. Further, since the loader has four replacement chucks, it cannot be speeded up due to inertia. Further, there is a problem that the material reference position in the Z-axis (longitudinal) direction needs to be adjusted according to the material.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to rotate the loader head for exchanging the work of the first spindle and the second spindle with one loader head. It is an object of the present invention to provide a loading device equipped with a reversing chuck that can be sequentially performed without any work and that can easily cope with works of different lengths.

MEANS FOR SOLVING THE PROBLEMS The present invention is a machine tool having two spindles for supplying a material to the two spindle positions and unloading a product, and is mounted on the first spindle in a machine tool. A first spindle chuck,
A second spindle chuck fitted on the second spindle, a material transporting device for loading the material to the material delivery position directly above the first spindle chuck, and a material delivery position just above the second spindle chuck. A product conveying device that carries out a product from a product receiving position at the same height by a chuck, and a first semi-finished product receiving position provided on the machine and directly above the material passing position, and a semi-finishing process on the second spindle chuck side. The first reversing chuck which can swivel the gripping axis in the material passing direction from the Z axis (main axis) direction to the X axis (left and right) direction by 90 ° and is movable in the X axis direction, and the second half directly above the product receiving position. A semi-working material reversing device comprising a second reversing chuck facing the first reversing chuck and swiveling 90 ° in the Z-axis direction and the X-axis direction at a processing material receiving position; Material transfer at spindle chuck and material passing position X-axis for delivery to the chuck of the device, the first reverse chuck at the first semi-processed material receiving position, the second spindle chuck, the chuck of the product transfer device at the product receiving position, and the second reverse chuck at the second semi-processed material receiving position , Y-axis (up and down) and Z-axis can be moved and positioned in 3 directions, and the distance is the same as the interval between the first semi-processed material receiving position and the material passing position.
A loader head having a plurality of loading chucks, a first spindle chuck attachment / detachment, a second spindle chuck attachment / detachment, a first inversion chuck transfer, a second inversion chuck reception, and a material. Receiving from the carrier,
The transfer to the product conveying device is performed by the movement of one loader head in the three axial directions.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. A headstock 2 is placed and fixed on the central portion of the upper surface of the bed 1, and two unillustrated main shafts are rotatably supported side by side on the headstock 2 with their axes horizontally and parallel to the front-rear direction. And this 2
Spindle chucks 3A and 3B are respectively fitted to the tips of the spindles of the book. Further, sliding guide surfaces 4A, 4B parallel to the spindle are cut on both sides of the upper headstock 2 of the bed 1, and sliding guide surfaces (not shown) in the X-axis direction are formed on the sliding guide surfaces 4A, 4B. The carriages 5A, 5B that it has are movably mounted, and two tool rests 6A, 6B are provided symmetrically on the sliding guide surface in the X-axis direction, and NC control is performed in the Z-axis and X-axis directions. Move and position independently. And, each turret 6A, 6B has N turrets 8A, 8B having mounting surfaces for a plurality of tool holders 7 on the outer circumference.
The tool T is attached to the tool holder 7 so as to be turnable and indexable by C control.

A side plate 12 is vertically provided on the left end of the bed 1, and one end is fixedly attached to the side plate 12 and a column provided on the left side floor of the machine.
A material receiving gutter 14 having a U-shaped groove whose tip is supported by 13 is attached to the main body side with a downward inclination. Material receiving gutter 14
A well-known fluid pressure driven feeding device 15 for feeding the materials one by one is attached near the side plate 12, and is fed onto the material lifting device 16. The material lifting device 16 vertically lifts the material by a V-shaped base 18 provided on the upper end of a piston rod fitted into a fluid pressure cylinder 17 which has a shaft center vertical to the left side surface of the side plate 12 and is fixed. There is. A frame body 22 of a material Z-axis moving device 20 having rails 22a in the front-back (Z-axis) direction is fixedly installed on the upper left side surface of the side plate 12. The first moving table 23 is provided on the rail 22a by the known double cylinders 24 and 25 so that the first moving table 23 can be moved and positioned at three positions of a standby position A, a material receiving position B, and a material passing position C. Align the axis center with the lower part of the arm 23a of the first moving table 23
A fluid pressure driven first moving chuck 26 is fixedly provided in the axial direction and faces the material lifting device 16 side. Between the left side of the upper front side of the headstock 2 and the side plate 12, the frame body 30 of the material X-axis moving device 29
Is fixed. The frame 30 is provided with a rail 30a horizontally in the left-right (X-axis) direction, and a second moving table 31 provided with a fluid pressure driven second moving chuck 32 concentrically opposed to the first moving chuck 26 is provided with a second moving table 31. It is provided so as to be movable along. Then, both ends of a chain 33 stretched between chain gears (not shown) provided at both ends of the frame body 30 are fixed to the second moving table 31, and the second feeding table 31 is moved in the X-axis direction by the feed motor 34. The material receiving position D and the material passing position E are positioned.

Two rails 38a parallel to the X-axis direction on the upper surface of the headstock 2.
The fixed base 38 having the
A third movable table 39 having an axial rail 39a is movably mounted and moved and positioned by a fluid pressure cylinder 40 to an F position above the spindle chuck 3A and a G position above the spindle chuck 3B. The fourth moving base 41 of the loading device 37 having the slide guide hole 41a in the vertical (Y-axis) direction on the rail 39a.
Is mounted so as to be movable in the Z-axis direction, and is moved by a ball screw 43 rotated by a motor 42 whose rotation is controlled by NC to be positioned at two transfer positions H and I.

On the other hand, the lower base 47 of the work material reversing device 46 is fixedly installed on the upper surface of the fixed base 38 below the front rail 38a. A rail 47a in the X-axis direction parallel to the rail 38a is provided on the left side of the upper surface of the lower table 47, and a fifth moving table 48 is movably mounted on the rail 47a and moved by a fluid pressure cylinder 49 to be delivered. position
It is positioned at two positions, J and K. A swivel shaft 51A is provided in the front part of the fifth movable table 48 so as to swivel with its axis center vertical, and a fluid pressure driven first reverse chuck 5 is provided below the swivel shaft 51A.
2A is fixed with the axis centered horizontally. The first reverse chuck is a gear 5 that is fitted to the output shaft of the fluid pressure rotary cylinder 53A.
A gear 56A fitted to a swivel shaft that is rotated via an intermediate gear 55A meshed with 4A is turned 90 ° and indexed forward and rightward. Further, a bracket 57 is fixedly mounted on the front surface of the lower base 47 at the right W position, and the first reverse chuck 52A and a second reverse chuck 52B similar to the reverse drive mechanism thereof, a swivel shaft 51B, a fluid pressure rotary cylinder 53B are fixed to the bracket 57. Gears 54B, 55B and 56B are provided symmetrically. The first and second reversing chucks 52A and 52B are turned and indexed so as to be reversed by 90 ° in opposite directions and face each other forward. Meanwhile the fourth
A sliding shaft 60 is inserted into a vertical hole 41a of a movable table 41 so as to be slidable only in the Y-axis direction, and a loader head 61 fixed to the lower portion of the sliding shaft 60 includes a fluid pressure driven first loading chuck 62 and a second loading chuck 62. The loading chucks 63 are arranged vertically at the same pitch as the second chuck positioned at the E position and the first reverse chuck 52A positioned at the J position and facing the front with the axis centered horizontally. Further, an NC control motor 65 is fixed in a direction perpendicular to the vertical hole 41a of the fourth moving base 41, and a pinion 66 fitted to this output shaft meshes with a rack 67 provided parallel to the sliding shaft 60. And the sliding shaft 60 is moved so that the first and second loading chucks 62 and 63 are concentric with the second moving chuck 32 and the first reversing chuck 52A, and the first loading chuck 62 is the main shaft chuck 3A. Intermediate position M concentric with
And, the second loading chuck 63 is moved and positioned to three positions, that is, a lower position N which is concentric with the spindle chuck 3A. In order to replace the chuck jaws, the loader head 61 can be turned 180 ° by loosening a set bolt (not shown) so that the loading chucks 62 and 63 can face forward.

A frame body 69 of the product X-axis moving device 67 is fixed between the side plate 68 provided at the right end of the bed 1 and the upper right side of the front side surface of the headstock 2. The frame 69 has a rail 69a in the X-axis direction, and a sixth moving base 71 having a third moving chuck 70 facing the same direction as the second moving chuck is moved along the rail 69a by a chain 72 driven by a feed motor (not shown). Are moved to be positioned at two positions, a product receiving position O and a product delivering position P.

A product Z having a rail in the Z-axis direction on the upper right side surface of the side plate 68.
A frame 74 of the shaft moving device 73 is fixedly provided, and a seventh moving base 75 having a rail 75a in the Y-axis direction is movably provided along the rail. The seventh moving table 75 is a known double cylinder 76/77.
Depending on the standby position Q, product receiving position R, product passing position S 3
It is possible to move and position to a position. An arm 79 movable by a fluid pressure cylinder 78 is provided along the rail 75a of the seventh moving table 75. A fourth moving chuck 80 is provided below the arm 79 so as to face the third moving chuck 70 with its axis centered horizontally.

One end is fixed to the side plate 68, and it is provided on the floor on the right side of the machine, and the support 82
An article carrying-out trough 83 having a U-shaped groove whose tip is supported is attached at a downward inclination. And the fourth moving chuck
80 is positioned in two positions, a product receiving position T and a discharging position U, which are concentric with the third moving chuck 70 by the movement of the arm 79 in the Z-axis direction, and the product released from the fourth moving chuck 80 at the U position uses an inclination. Then, it is rolled out in the U-shaped groove and carried out.

In another embodiment, as shown in FIG. 10, the semi-machined material reversing device 46 is removed and only one loading chuck of the loader head 61 is used. A non-reversing type compatible with a two-spindle lathe that performs the same machining on two spindles. It is a loading device. Even in the non-inverted type, it is possible to provide two loading chucks to obtain a high efficiency type.

Operation Now, in FIGS. 1 to 9, in the two-spindle NC lathe, the left spindle performs the first machining and the right spindle performs the second machining on the back surface. And, the material is the center Z in the U-shaped groove of the material receiving gutter 14.
A plurality of them are arranged in a line in the axial direction and are stocked. The material on the material receiving gutter 14 is lifted one by one by the material feeding device 15 which operates according to the NC command.
It is sent to the V-shaped stand 18 of. Then, the material is lifted by the fluid pressure cylinder 17 to a position concentric with the first moving chuck 26 waiting at the position A of the material Z-axis moving device 20, and the first moving table 23 is moved by the double cylinders 24, 25 to make the first movement. The chuck 26 moves to the B position, and the gripping claw is V-shaped by the fluid pressure drive.
18 Hold the material above. The V-shaped base 18 is lowered and retracted, the first moving chuck 26 is moved to the C position, and the material X-axis moving device 29 is moved to the D position.
The material is delivered to the second moving chuck 32 waiting at the position. The second moving chuck 32 is moved to the E position by the chain 33 driven by the feed motor 34, and the first loading chuck 62 is waiting at the H and L positions of the loading device 37.
Concentric with and face each other. The first loading chuck 62 is moved to the I position via the fourth moving table 41, the sliding shaft 60, and the loader head 61 which are moved by the ball screw 43 rotated by the motor 42 which is rotated by NC control. The first loading chuck 62 is brought closer to the moving chuck 32 and driven by fluid pressure.
The gripping claw is closed, the gripping claw of the second moving chuck 32 is opened, the material is gripped again, and the material moves backward to the H position. The first loading chuck 62 holds the material and waits at the L position. The emptied second moving chuck 32 moves to the position D again for receiving the next material.

When the first machining is completed, the pinion 66 is rotated by the motor 65 rotated by NC control, the sliding shaft 60 is moved and lowered via the rack 67, and the loader head 61 is moved to the N position. In this state, the second loading chuck 63 is concentric with the spindle chuck 3A, moves to the I position and approaches the spindle chuck 3A, and the gripping claws are closed to grip the workpiece after the first machining. Subsequently, the grip claws of the spindle chuck 3A are opened to perform grip replacement,
The second loading chuck 63 retracts to the H position, and the work material is extracted from the spindle chuck 3A. Next, the loader head 61 moves up to the M position, the first loading chuck 62 becomes concentric with the spindle chuck 3A, moves to the I position again, approaches the spindle chuck 3A, and the material held by the first loading chuck 62 is the spindle chuck. It is loaded into the open gripping claw of 3A. The gripping claws of the spindle chuck 3A are closed, the gripping claws of the first loading chuck 62 are opened, the material is gripped and changed, and the material is retreated to the H position, the first loading chuck 62 is emptied, and the loader head 61 is set to the L position. To rise. The second loading chuck 63, which is positioned at the L position and holds the semi-processed material, is concentric with the first reversing chuck 52A facing the front at the J position of the processing material reversing device 46, and the second loading chuck 63 is at the I position. The semi-processed material is carried into the gripping claws of the first reversing chuck 52A that has moved and has come close to the first reversing chuck 52A, and after being gripped and replaced, the second loading chuck 63 retracts to the H position. The semi-processed material is gripped by the first reverse chuck 52A. The first reversing chuck 52A is swung 90 ° by the fluid pressure rotating cylinder 53A, and at the same time, the second reversing chuck 52B is also swung 90 ° by the fluid pressure rotating cylinder 53B in the opposite direction so that the holding claws face each other. The first reverse chuck 52A is the fluid pressure cylinder 4
It is moved to the K position by the fifth moving table 48 which is moved by 9 and approaches the second reversing chuck 52B, and the semi-processed material is gripped by the second reversing chuck 52B. First reverse chuck 52A
Moves to the J position, and the first reverse chuck 52A and the second reverse chuck 52B turn 90 ° to face the front. Subsequently, the fourth moving table 41 of the loading device 37 is moved in the X-axis direction by the fluid pressure cylinder 40 to the G position, and the second reversing chuck 52B that faces the front by gripping the semi-processed material and the empty second loading chuck. 63 becomes concentric. Then, the second loading chuck 63 moves to the I position, approaches the second reversing chuck, and the semi-processed material is gripped and replaced by the second loading chuck 63.
The second loading chuck 63 retracts to the H position, the loader head 61 descends to the M position, and the second loading chuck 63 is empty.
Loading chuck 62 and spindle chuck that holds the product
3B becomes concentric, the first loading chuck 62 is moved to the I position, approaches the spindle chuck 3B, and the finished product is gripped by the first loading chuck 62. First
After the loading chuck 62 retreats back to the H position, the loader head 61 is moved to the N position so that the semi-processed material which the second loading chuck 63 has completed the first machining is gripped by the spindle chuck 3B. Next, the loader head 61 moves up to the L position, and the third moving chuck 70 and the first loading chuck 62, which are waiting at the O position of the product X-axis moving device 67, become concentric, and the product is gripped and replaced by the third moving chuck 70. It The third moving chuck 70 gripping the product moves to the P position, and the fourth moving chuck 80 stands by at the Q position of the product Z-axis moving device 73.
Become concentric with.

Then, the seventh moving table 75 is moved to the R position by the double cylinders 76 and 77, the fourth moving chuck 80 approaches the third moving chuck, and the product is received from the third moving chuck 70. Subsequently, the fourth movable chuck 80 is moved to the S position and then emptied, the third movable chuck 70 is returned to the O position, and the fourth movable chuck 80 is moved.
Is U by an arm 79 which is moved by a hydraulic cylinder 78
The product that is lowered to the position and gripped stops slightly above the U-shaped groove of the product discharge trough 83, the grip claws of the fourth moving chuck 80 are opened, and the product is dropped into the U-shaped groove and the slope is used. Be shipped. Meanwhile, the empty first and second loading chucks
62 and 63 are moved to F and L positions and the next material is moved to the second moving chuck.
Wait until receiving turning from 32.

Next, the operation of the other embodiment shown in FIG. 10 will be described. The second moving chuck 32 that grips the material of the material X-axis moving device 29 and is positioned at the E position is replaced by the loading chuck 62 that is waiting at the L position, and the loading chuck 62 that grips the material is the loader head 61. The lowering chuck 62 is moved to the M position to be concentric with the spindle chuck 3A, the material is gripped and replaced by the spindle chuck 3A, and the empty loading chuck 62 moves up again by the movement of the loader head 61 and waits at the L position. When the next material is gripped by the second moving chuck 32 and positioned at the E position, gripping is changed and the loading chuck 62 is again loaded.
Grips the material and is moved to the G position by the movement of the fourth moving table 41, and is lowered by the movement of the loader head 61 to move to the M position at the spindle chuck 3B.
The material is gripped by the spindle chuck 3B while being concentrically changed. And the empty loading chuck 62
Returns to L, F position and waits. When the turning process of the spindle chuck 3A is completed, the loading chuck 62 descends to the M position, is concentric with the spindle chuck 3A, and is gripped and replaced, and the product is gripped by the loading chuck 62. The loading chuck 62 is moved to the L position by the movement of the loader head 61, further moved to the G position, and is concentric with the loading chuck 62 and the third moving chuck 70 stopped at the O position of the product X-axis moving device 67. The grip is changed and the product is the first moving chuck 70.
It is gripped and carried out. By providing two loading chucks on the loader head 61 and slightly changing the above-mentioned movement path, a higher efficiency type can be obtained.

Effects As described in detail above, the present invention provides one loader head having one or two loading chucks, which is movable on X-axis, Y-axis, and Z-axis, on a headstock, and is provided on two spindles. It is possible to eliminate the turning motion during the material supply and product unloading operations to reduce the inertia, and to achieve work replacement with efficient movement of three axes. Also, since the material of the first spindle and the material of the second spindle are not changed at the same time but sequentially, the machining with the first spindle and the second spindle is
This is efficient because it is not necessary to wait for the completion of machining for the longer machining time. Further, it is not necessary to adjust the material reference position according to the material. Further, the one provided with the reversing device which can move one reversing chuck of the two reversing chucks which can be turned by 90 ° in opposite directions, can be reversed immediately on the machine and the working efficiency can be improved. One more chuck for reversing
In the case of 180 ° inversion, it was necessary to change the material reference surface of the inversion chuck depending on the length of the material, but in the case of the present application, it is not necessary to change it, and the first inversion chuck can be moved to the left and right to obtain different lengths. It is easy to deal with workpieces of the same size, and can be applied to other mechanisms with a slight modification, and a wide variation such as a reversing type and a non-reversing high efficiency type can be obtained by changing some devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a two-spindle NC lathe with a loading device according to the present invention, FIG. 2 is a schematic front view of the present invention including operation explanations, and FIG. 3 is the present invention. Fig. 4 is a side view of the loading device and reversing device of Fig. 4, Fig. 4 is a front view of the reversing device,
4 is an explanatory view seen from above in FIG. 4, FIG. 6 is an explanatory view of a material Z-axis moving device, FIG. 7 is an explanatory view of a product Z-axis moving device,
FIG. 8 is an enlarged perspective view of a state in which the loader head portion is swung to the front side, FIG. 9 is a movement explanatory view of the loader, and FIG. 10 is a perspective view of a two-spindle NC lathe with a non-inverting type loading device. . 3A, 3B …… Chuck 8A, 8B …… Turret 12,68 …… Side plate 14 …… Material receiving gutter, 15 …… Material feeding device 16 …… Material lifting device 20 …… Material Z-axis moving device 23 …… No. 1 moving table 26 …… first moving chuck 29 …… material X-axis moving device 31 …… second moving table, 33,72 …… chain 32 …… second moving chuck 37 …… loading device, 39 …… third Moving table 41 …… 4th moving table, 48 …… 5th moving table 46 …… Semi-workpiece reversing device 52A …… First reversing chuck 52B …… Second reversing chuck 61 …… Loader head 62 …… First loader Chuck 63 …… Second loader chuck 67 …… Product X-axis moving device, 75 …… Seventh moving table 70 …… Third moving chuck 73 …… Product Z-axis moving device 80 …… Fourth moving chuck 83 …… Product Carry-out gutter

Claims (1)

[Claims] 1. A first spindle chuck fitted to a first spindle in a machine tool having, on this machine, a transporting device having two spindles for supplying a material to these two spindle positions and unloading a product. A second spindle chuck fitted to the second spindle, and the first spindle chuck.
A material conveying device that conveys the material to the material delivery position directly above the spindle chuck by a chuck, and a product conveying device that conveys the product from the product receiving position at the same height as the material delivery position above the second spindle chuck by the chuck. And a gripping axis from the Z-axis (main axis) direction to the X-axis in the semi-finished material passing direction on the side of the second spindle chuck at the first semi-finished material receiving position provided on the machine and directly above the raw material passing position. 90 in (left / right) direction
A first reversing chuck which can be rotated by 90 ° and movable in the X-axis direction, and the first reversing chuck which is rotated by 90 ° in the Z-axis direction and the X-axis direction at the second semi-processed material receiving position directly above the product receiving position. A semi-working material reversing device including a second reversing chuck facing the first reversing chuck, the first spindle chuck provided on the machine,
Chuck of material transfer device at material transfer position, first reverse chuck at first semi-finished material receiving position, second spindle chuck, chuck of product transfer device at second product receiving position, second reverse chuck at second semi-finished material receiving position X axis, Y for delivery with
Includes one loader head with two loading chucks at the same intervals as the first semi-processed material receiving position and the material passing position, which can be moved and positioned in three axial directions (up and down) and Z axis It consists of 1 attachment / detachment of the 1st spindle chuck, 2nd attachment / detachment of the 2nd spindle chuck, delivery to the 1st inversion chuck, reception from the 2nd inversion chuck, and receipt from the material transfer device and delivery to the product transfer device. The loading device is characterized in that the loader head is moved in three axial directions.