JPS5923921B2 - Machine Tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool, and more particularly to a machine tool that can perform different types of cutting operations on a workpiece portion in a short time.

Conventionally, in order to perform different types of cutting on the machined parts of the workpiece, one machine tool was used to perform different types of cutting on the machined parts of the workpiece.
One type of cutting process was performed, and then this workpiece was transferred to another machine tool, and then another type of cutting process was performed on that machine tool.

However, this method requires manpower and time to transfer the workpiece from one machine tool to another.
It wasn't efficient.

Also, machine tools equipped with multiple cutting devices are known to perform different types of cutting with one machine tool, but in such machine tools, one cutting device is activated to perform one cutting process. When one type of cutting process is being performed, other cutting equipment is on standby, which is not always efficient in terms of time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a machine tool that can efficiently perform different types of cutting operations on the processed portion of a workpiece in a short period of time.

According to the present invention, in order to achieve the above object, a rotatable workpiece table configured to receive a machined workpiece in a machine tool that performs cutting on a workpiece;
a rotating tool head on each side of the rotatable workpiece table; a separate power unit coupled to rotate each of the tool heads independently of the other; a power-operated feed device mounted on each of the tool heads for linearly moving each of the tool heads along an axis of rotation toward and away from the workpiece table while rotating; a power operated feedstock movable along an axis perpendicular to the axis of rotation and a track mounted on each of said feedstocks with a diameter dependent on the position of said feedstock relative to the axis of its associated tool head; A rotatable cutter is coupled to independently and simultaneously control the operation of each of said tool heads and their associated feedstocks to cause one program of machining operations to be performed on one side of the workpiece and simultaneously different One set of machining operations is now completed by causing the machining operations of the program to be performed on the opposite side of the workpiece, and after rotating the workpiece table, the machining operations of the same program are performed on the different sides of the workpiece. A machine tool having a control device is provided.

Preferably, in the machine tool described above, the rotational speed of the tool head is automatically adjusted when its associated feedstock is moved to provide a constant surface speed along the workpiece as the cutting tool changes the diameter of its trajectory. It is designed to be maintained.

The present invention also includes a control device that automatically adjusts the speed of movement of the feed table while adjusting the rotational speed of the tool head to maintain a constant thickness of chips removed by the cutter from the workpiece.

The present invention will now be described in detail with reference to the accompanying drawings.

The embodiment of the invention shown in FIG. 1 has two counter-rotating tool heads mounted on diametrically opposed sides of an indexing table and fixed thereon. The opposite ends of the workpiece are machined at the same time.

This embodiment of the invention has a conventional bed 10 having a central portion 12 supporting a rotary indexing table 14 and two diametrically opposed outer portions carrying carriages 18, 20, respectively. 15 and 16, and saddles 22 and 24 are slidably mounted on the feed base, respectively.

The carriage 18,20 and the saddles 22,24 define a common horizontal axis Z, which is perpendicular to the vertical axis Y, about which the indexing table 14 rotates.

Saddle 22 is moved onto carriage 18 by a two-axis drive motor 26, which is mechanically coupled to saddle 22 through a conventional ball screw mechanism (not shown).

A hollow tool drum 430, 32 is bolted to the top of each saddle 22, 240, respectively, and a corresponding tool head 34, 36 is mounted within the jacket for rotation about the Z axis.・Ru.

Each tool head 34,36 has a corresponding tool drum 38
．． 40, the tool drum extends within and is pivotally supported within the tool drum jacket 30,32.

Mounted on top of the tool drum jackets 30, 32 is a tool head motor 42, 44 which is coupled through a drive belt assembly 46, 4B to the corresponding tool drum 38.
40.

In FIGS. 7 and 8 showing the front side of the sole head 34 and 360, respectively, two movable knife feeders 50 and 52 are shown.
are mounted on the front of the tool head 34 so as to be able to slide along the X and U axes, respectively, and two tool feed stands 54 and 56 are mounted on the front of the tool head 36 so as to be freely slidable. They are suspended and are adapted to slide along the X and U axes, respectively.

The blade feed stands 50 and 52 are equipped with two DC motors 58 and 60.
(FIG. 1), the motor is mounted on the sole drum 38 and rotates therewith.

The motors 58, 60 are mechanically connected to the corresponding tool carriages 50, 52 through a ball screw mechanism,
It is electrically connected to a conductor on the tool drum jacket 30 by a slip ring assembly, which will be described below.

The blade feed stands 54 and 56 are similarly driven by DC motors 62°64
The motors are also connected to the corresponding carriages 54, 56 through a ball screw mechanism and electrically connected to conductors on the tool drum jacket 32 through a slip ring assembly.

FIG. 2 is an axial cross-sectional view of the tool drum jacket 30, tool drum 38, and tool head 34.

The tool drum jacket 30 is attached to the saddle 22 by bolts 66.
It is a hollow cylinder bolted to the

The tool drum 38 also has a cylindrical shape, and the tapered roller bearing 6
8 within the tool drum jacket 30.

The tool drum 38 has at its outer end a drive gear 70 which is driven by a mating gear 72 on a drive shaft 74 which is journalled in the tool drum jacket 30 by bearings 76,78.

A drive wheel 80 is rigidly mounted on the drive shaft 74 and is driven by the tool head drive motor 42 (FIG. 1).
It is rotated by a drive belt 81.

The knife feed safe drive motor 58 is mounted on a plate 82 (FIG. 2), which is connected to the tool drum 38 by bolts 84.
is bolted to the outer end of the tool drum 38 and rotates with the tool drum 38.

Motor 58 rotates a drive shaft 86 which is mechanically coupled to another drive shaft 88 through gears 90.92.

The drive shaft 88 is supported inside the tool drum 38 by a bearing 91, and is mechanically connected to a corresponding blade feed stand by a device to be described later.

Although only the mounting arrangement and drive shaft 88 for the tool carriage motor 58 are shown in FIG. 2, other tool carriage motors 60 and 60 may be located within the tool drum 38, as will be readily understood by the skilled artisan. Similar mounting equipment and drive shafts are included for the.

However, since these two motor mounts and drives are similar, only one will be discussed in detail.

FIG. 3 shows the mechanical connections within the knife feed safe drive shaft 88 and the corresponding knife feed carriage 50.

As is clear from FIG.
3 is formed with a slot 94 for slidably receiving the blade feeder 50 and for accurately guiding the blade feeder along the U axis.

The front face 93 is attached to the tool head 340 by bolts 96.
It is bolted to the main body 95 (FIG. 3) and this main body 9
5 is bolted to the end of the tool drum 38 by a bolt 98, which connects the tool drum 38 and the tool head 3.
4 are adapted to rotate relative to each other as a rigid unit.

The blade feed safe drive shaft 88 is connected by a splined joint 99 to an input shaft 100 of a spiral reduction gear assembly 102, which assembly is mounted on bearings 104, 106, 108°1.
10. It is pivotally supported in the hollow interior of the tool head by 112 and 114.

The output shaft 116 of the spiral reduction gear assembly 102 is threaded and forms part of a conventional ball screw mechanism that has a ball screw nut 118 attached to the tool carriage by a bolt 120. have.

Because the tool carriage motors 58, 60 rotate with the tool head 34, slip ring couplings must be used to apply excitation signals to these motors.

This slip ring joint is shown in FIG.

In this case two slip ring units are used, a large slip ring unit 122 and a small slip ring unit 124.

The slip ring unit 122 is attached to the outer housing 126
, the housing is rigidly mounted to the collar 128;
The collar is further rigidly attached to the sole drum jacket 30 by conventional equipment (not shown).

The slip ring unit 122 has a central rotating portion 130 on which a slip ring 132 is mounted.

A brush 134 is mounted on the fixed outer brush 126 and is adapted to contact the slip ring 132 to form an electrical contact therewith.

A conductor 136 connects from the machine control to the brushino, and a conductor 138 connects from the slip ring to the motors 58,60.
It is connected to the.

The inner rotating portion 130 of the slip ring unit 122 is journalled to its outer portion 126 by bearings 140 and is rigidly attached to a disc 144 by bolts 142, which in turn is attached to a collar 148 by bolts 146. The collar is attached to the tool drum 38 and rotates therewith.

The second slip-ring unit 124 is smaller than unit 122, but is similarly formed and has an outer housing 150 which is attached by bolts 152 to a collar 154 which is further connected to pole l-1.
56 to the housing 126 of the larger slip ring unit 122.

The inner rotatable portion of the small slip ring unit 124 is driven by a shaft 158 which is rigidly attached to and rotates with the plate 144 at its right end as shown in FIG.

The shaft 158 is connected to the collar 154 by bearings 160 and 162.
having a gear 164 journalled and rigidly mounted therein;
This gear meshes with a mating gear 166 mounted on the shaft 168 of the resolver 170.

A shaft 168 of the resolver 170 is supported in the collar 154 by bearings 172 and 174.

Resolver 170 generates an electrical signal that senses the angular position of tool head 340.

A conductor 136 attached to the brushes of the slip ring unit 122 moves along the Z-axis with the tool drum jacket 30, thus providing a long flexible cable or sliding contact for connecting the conductor 136 to the machine control. is not necessary.

The conductors 138 that rotate with the tool drum 38 can be attached directly to their respective motors 58,60.

The tool head 36 is the same as the tool head 34, together with its mounting device, tool feeder motor, and slip ring, so a detailed description thereof will be omitted.

9A and 9B are block diagrams of the electrical control circuitry for rotary tool head 34. FIG.

This special control device is a computer numerical control device CNC.
, tape reader, CNC process controller, CN
C input/output area area 0 and power distribution panel FDP area, all of which are shown in FIG. 9A.

The motor, resolver, tachometer and slip ring for the rotating tool head 34 connect these electrical elements to the ninth
It is shown in FIG. 9B with conductors connecting to the control circuit shown in FIG.

This FIG. 9B is a continuation of FIG. 9A.

As shown in FIG. 9A, the NC control device is the tape reader 1.
76, which reads the program for the machine and sends the corresponding digital signals to conventional data processing circuitry 178, which stores said signals and performs conventional arithmetic and distribution functions. I do.

This type of logic circuit is well known in the art and will not be described in detail.

Logic circuit 178 is connected to core memory 180, which stores specific programs for different parts to be machined by rotary tool head 34 of this particular machine.

The output of logic circuit 178 is a plurality of digital signals that control operation of rotary tool head 34 in a manner described below.

Saddle 22 (No. 9 B) carrying rotary tool head 34
) is moved along the Z-axis by a Z-axis motor 26 that rotates a shaft 182 that is mechanically connected to the saddle 22 through a ball screw mechanism (not shown).

Z-axis tachometer 184 and Z-axis resolver 18
6 is mechanically coupled to the axis of the Z-axis motor 26 to perform conventional information feedback functions.

The control circuitry for the Z-axis motor 26 includes a conventional axis interpolator 188 (FIG. 9A), a conventional error tracking counter 190, a conventional feedback counter and oscillator 192, a conventional digital-to-analog converter 194, and a conventional Z-axis interpolator 188 (FIG. 9A).
A conventional drive amplifier 196 connected to the axis motor 26
, a Z-axis tachometer 184 and a two-axis resolver 186 in a conventional closed-loop servo drive.

The operation of the servo drive is controlled by three digital signals fed through logic circuit 178 to axis interpolator 188.

These signals are a digital 7 word indicating the position along the Z-axis as the saddle 22 moves, a digitized feedrate signal FR indicating the feedrate of the saddle's movement toward its destination, and a digital function code indicating the function to be performed. Contains G.

During a typical phase of the operating program when the saddle 22 is to be moved inwardly to a predetermined point, digital signals are sent to the axis interpolator 188 to determine the direction of rotation of the Z-axis motor 260, the Z-axis along the saddle 22
represents the point to be moved and the feed rate for that movement.

This information is fed to an error tracking counter 190 where it is compared with a digital feedback signal from a feedback counter and oscillator 192.

This feedback counter and oscillator 192 is controlled by the Z-axis resolver 186 and contains a digital number representing the actual position of the saddle 22.

the actual position and the desired position of the saddle 22 are compared;
And if there is a difference between them, a drive signal is sent to the digital-to-analog converter 194 and the drive amplifier 196, which drives the Z-axis motor 26 in the desired direction at the desired feed rate.

The feedback signal from the Z-axis tachometer 184 is fed by a conventional closed-loop servo system and
The motor 26 is driven at an appropriate speed to maintain the Z feed rate within a predetermined tolerance of the required feed rate.

Once the saddle 22 reaches the desired position along the two axes, this information is fed by the Z-axis resolver 186 to a feedback counter and oscillator 192 which sends a corresponding digital number to the error tracking counter 190. send.

At this point, the actual position of the saddle 22 matches its required position, so the output of the error tracking counter 190 is zero, which means that the motor has rotated 260 revolutions on the Z-axis. Pause until it moves to a different position.

The X-axis motor 60 is also controlled by a similar closed-loop servo 1 drive, which includes an axis interpolator 198, an error tracking counter 200, a feedback counter and oscillator 202, a digital-to-analog converter 204, and a drive amplifier. 206, X-axis tachometer 20
8 and an X-axis resolver 210.

The only difference between the X-axis drive circuit and the Z-axis drive circuit, apart from their relative power levels, is the X-axis drive conductor.

E and F are slip ring and brush connections 212゜21
4.216, whereas the Z-axis drive conductors A, B, C are directly connected to their motors, tachometers and resolvers.

Slip ring and brush connections 212 are contained within the large slip ring unit 122 and slip ring connections 214, 216 are contained within the small slip ring assembly 1.
Included within 24.

The U-axis interpolator 58 is controlled by a similar closed-loop servo system that is connected to the axis interpolator 2.
18, error tracking counter 220, feedback counter and oscillator 222, digital-to-analog converter 22
4. Drive amplifier 226, U-axis tachometer 228, U-axis resolver 170, and slip ring brush connection member 23
It has an angle of 0,232°234.

This servo drive also operates in the same manner as the Z-axis top drive.

The tool drum motor 42 is driven by a similar closed-loop servo system that includes an interpolator 236, an error tracking counter 238, a feedback counter and oscillator 240, a digital-to-analog converter 242, a drive amplifier 246, a tachometer 248, and a It has a resolver 250.

This servo drive operates in the same manner as the servo drive for the Z-axis motor 26.

In addition to the previously described control circuit for the rotary tool head 34,
Two sets of similar circuits for rotating tool bed 36 are provided and are also controlled by the digital output signals of logic circuit 178.

Furthermore, a further control circuit is provided for controlling the indexing table 14 so that a pallet carrying workpieces can be moved onto the indexing table 14 and can be clamped or released.

However, since such a circuit is common, a detailed explanation thereof will be omitted.

As shown in FIG. 9B, a tool holder 252 is mounted on the tool carriage 50 and a similar tool holder 254
are mounted on the blade feed stand 52, and each blade 256.
258 is supported.

As shown in FIG. 7, the tool holder 252.2
54 positions the cutters 256,258 on approximately the same diameter of the rotary tool head 34, and allows the cutters 256,258 to remain on the same radius even if the slots 94 guiding the cutter feeds 50, 52 are offset from the rotary tool bed 340 radius. It is designed to move inward and outward.

The knife carriages 50, 52 are moved separately and similarly to cause both knives 256 and 258 to perform the cutting.

However, in this particular embodiment of the invention, the knife carriages 50, 52 move separately according to the cannibal program, with the knife 258 roughing in one stage of the cannibal program and the knife 256 in the next stage of the cannibal program. Perform finish cutting.

In the embodiment shown in FIG. 9B, the cutter is 256°25
8 is positioned to cut the inner surface of a flange on a workpiece 262, which in its entirety constitutes the cast steel tractor axle box shown in FIGS. 5 and 6.

The axle box 262 has a mounting fixture 264 attached to a pallet 266.
The pallet is further held on an indexing table 1
4 (Fig. 1).

This particular embodiment of the invention provides axle box 262 in a manner as described below.
The flanges at both ends are machined.

The blade feed stand 50 or 52 moves inward to the axle box 262.
The relative velocity of the surface to be cut and the corresponding cutting tool 256 or 258 decreases as the inward movement progresses if the rotational speed of the tool head 340 is constant. do.

Accordingly, the memory portion 265 (FIG. 9A) of the CNC processor is stored with a routine defining a constant surface speed CSS operation such that the rotational speed ω of the sole head 340 at any point in time varies according to the following equation: is desirable.

S 2πRc In the formula, SS is the required surface cutting speed, and Re is the radius of the circle drawn by the cutting edge of the cutting tool used.

When using the C8S method of operation, a constant relative velocity is automatically established between the surface to be cut and the cutting edge of the knife that is cutting this surface, independent of the lateral movement of the knife. maintained.

In C8S method work, if the lateral feed speed of the tool feed used to cut the flange is maintained at a constant level, the thickness of the chips will change as the rotation speed of the tool head changes. Change.

If the thickness of the chips is to be constant, it is desirable to store a routine IPR of 1 inch per revolution in the memory section 267 of the CNC.

In this case, the lateral feed speed FR of the tool feed stand at any given time is given by the following equation.

FR=Qω In the formula, Q is the thickness of chips per one rotation of the tool head, and ω is the rotational speed of the tool head at any given time.

Both tool feeds 50, 52 can be controlled separately in C8S and IPR operations and the RPM
Even when the traverse feed speed is constant, it can be controlled separately.

In FIG. The rim 268 and outer surface 270 of the flange can be cut as described below.

In addition to being capable of cutting flat surfaces perpendicular to the axis of the workpiece, or cylindrical surfaces coaxial with the axis, this embodiment of the invention can cut axially curved surfaces, such as surface 272 in FIG. 9B. That is, it is possible to machine a curved surface that forms part of a circle that is tangent to and continuous with the flat flange surface 260.

The axially curved surface 272 is cut by feeding the blade 258 axially along the Z-axis and radially along the X-axis at a pre-calculated speed to form the desired curve. be done.

Although this curve is a circular arc in this embodiment, it can be a parabola or any other desired curved arc.

The machine tool normally operates in C8S and IPR mode when the inner surface 260 of the flange is being machined, but at a transition point 274 (FIG. 9B) from flat surface 260 to curved surface 272, rotary tool head 34 operates in C8S and IPR mode. The mode operation is switched to constant speed RPM mode operation, while the tool feed carriage 52 is switched from the IPR mode of operation to constant speed lateral feed, which is denoted as IPM mode of operation.

At the same time, a predetermined axial feed is initiated along the Z axis at a predetermined feed rate to form the required curve 272.

Under normal conditions, the rotating sole head 34 remains in a rotating state when transitioning from the flat surface of the flange to its curved surface, and the tool feed base 52 normally continues its lateral movement during this transition period, but as needed. Both the rotational movement of the rotating sole head 340 and the traverse movement of the tool carriage 52 can be stopped at the transition point from the flat surface 260 to the curved surface 272.

In this case, as long as the radius of the cutting edge of the cutter at the end of the flat surface 260 is the same as its radius at the beginning of the curved surface 272, the transition from said flat surface 260 to the curved surface 272 remains smooth; Between stopping and starting the rotary tool head 34, no movement of the cutting edge occurs along the two axes.

In addition to the above-mentioned movable blade feed stands 50, 52, 54, 56,
This embodiment of the invention includes a fixed tool holder 276.
278, 280, 282 (FIGS. 7 and 8), these tool holders are mounted in front of the rotating tool bed 34, 36 and are used for roughing and finishing the outer rim of the flange of the axle box 262. It is supposed to be done.

When using fixed tool holders 276-282 as shown in FIG. 5 to cut the outer flange rim 268, all movable tool holders 50-56 are moved away from their respective tools or workpieces. moved into position.

On each tool head 34.360, one of the stationary knives performs the rough cutting of the flange rim 268, and the other knife performs the finishing cutting.

The fixing tools 276 to 282 preferably have corresponding slots 28
4 to 290 and secured to the corresponding rotary tool head 34 or 36 by conventional clamps to move the cutter to different positions and adapt it to different flange sizes.

Although tool holders 276-282 are adjustable, they are referred to herein as fixed tool holders.

The reason for this is that the tool holder is normally set at a fixed position for each different type of axle box and fastened at this position, and during machining operations it is not used as a movable tool feeder 50 to 56. This is because it does not move.

A typical machine tool program includes the following steps or functions:

(1) The pallet 266 (FIG. 1) carrying the fixture 264 that supports the axle box 262 in a predetermined and accurate position is placed on the indexing table 13 and is placed in a predetermined position on the table. It is fastened.

In this position the opposite ends of the axle box are accurately positioned relative to the rotary tool head 34,36.

(2) The tool heads 34 and 36 are simultaneously rotated and sent inward along the Z axis, and are moved outward from the flanges at both ends of the axle box 2620 by the fixed tool holders 276 to 282, as shown in FIG. Process the rim 268.

(3) Next, move the sole heads 34, 36 to the position shown in FIG. 6 in preparation for machining the inner and outer surfaces of the flange.

(4) Next, each tool head 34, 36 is rotated in the C8S working mode without movement along the Z axis, and one of the two tool feeds above it is operated in the IPR working mode. Roughly mill the flange surface to accommodate tightening,
The outer flange surface 270 is cut by the sole head 36 and the inner surface 260 is cut by the tool head 34.

(5) At the transition point 274 on the inner flange surface between the flat surface 260 and the curved surface 272, the sole head 34
switches from the CSS and IPR working mode to the CI working mode without stopping its rotation or the lateral movement of the tool feed carriage 52, and the curved surface portion 272 continues tangentially to the flat surface portion 260 of the flange. Process.

(6) After rough cutting the inner and outer flange surfaces,
The tool feed stand that was not used for this rough cutting is at stage (4)
And, it is operated in the same manner as in case (5), and the flange surface which has been roughly cut is finished cut.

(7) Next, the tool heads 34, 36 are separated from the adjacent flanges to form a gap for indexing the kneaded silk.

(8) Next, rotate the axle box 262 180 degrees around the Y axis and replace the flanges with respect to the tool heads 34 and 36.

(9) Next, repeat steps (3) to (6) to process the remaining two flange surfaces.

00) The tool heads 34, 36 are then moved away from the flanges to create a gap for removing and replacing the axle box 262.

01) Remove pallet 266 from index table 14 and replace with another pallet carrying raw axle boxes.

Although the machined nib program described above is suitable for the particular shape of flanges and axle boxes shown, it is also suitable for different machining operations on flanges of other shapes and other workpieces.

Although in the embodiment described, the tool heads 34, 36 both rotate about and slide along a common Z axis, this is not necessarily a necessary feature of the invention.

For certain workpieces it may be desirable to have the tool head rotate about different axes, and this does not change the basic operation of the invention.

The present invention can be modified in various ways without departing from the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention using two counter-rotating tool heads to machine flanges on opposite ends of an axle box. 2 is an axial cross-sectional view of the tool drum and its jacket forming one of the rotary heads shown in FIG. 1; FIG. FIG. 3 is an axial cross-sectional view of one of the tool heads and a portion of its tool drum. FIG. 4 is an axial cross-sectional view of the slip ring assembly for the rotary tool head shown in FIGS. 2 and 3; FIG. 5 is a side view of an axle box mounted in a fixture between two rotating tool heads, showing a stationary tool holder on the tool head for machining the circular flange of the flange. FIG. 6 is a side view similar to FIG. 5, but showing a movable tool carriage on a rotary tool head for machining the outer and inner surfaces of the flange and the curved surfaces adjacent to the inner surfaces. FIG. 7 is a front view of one of the tool heads showing the movable tool carriage fixed thereon. FIG. 8 is a front view of another rotary tool head showing a movable tool carriage fixed thereon. FIG. 9A is a block diagram of the NC processor showing the input-output area and power distribution panel area for one of the rotary tool heads of the machine tool shown in FIGS. 1-8. Figure 9B is a block diagram showing one of the rotary tool heads;
Figure 9A shows a resolver controlling the operation of the tool head by the electric motor, slip ring, tachometer and electrical circuitry shown in Figure 9A. In Figure D, 10 is a bed, 12 is a central portion, 14 is an indexing table, 15 and 16 are outer portions, 18.20 is a feed table, 22.24 is a saddle, 26 is a Z-axis drive motor, 3
0, 32 are tool drum jackets, 34, 36 are tool heads, 38. 40 are tool drums, 42, 44 are tool head motors, 46, 48 are drive belt assemblies, 50,
52 is a blade feed stand, 58-62 is a DC motor, 66 is a bolt, 68 is a tapered roller bearing, 70 is a drive gear, 72 is a gear, 74 is a drive shaft, 76.78 is a bearing, 80 is a drive wheel, 81 is a Drive belt, 82 plate, 84 bolt, 86
, 88 is a drive shaft, 91 is a bearing, 90.92 is a gear, 93
94 is a slot, 95 is a main body, 96, 98 are bolts, 99 is a joint; 100 is an input shaft, 102 is a reduction gear assembly, 104-114 is a bearing, 116 is an output shaft, 11
8 is ball screw neck), 120 is bolt, 122
124 is a large slip ring unit, 124 is a small slip ring unit, 126 is a housing 1, 128 is a collar, 130 is a central rotating part, 132 is a slip ring, 134 is a brush, 136° 138 is a conductor, 140 is a bearing, 142 is a bolt , 144 is a disk, 146 is a bolt, 148 is a collar, 150 is a housing, 152 is a bolt, 154 is a collar, 156 is a bolt, 158 is a shaft, 160° 162 is a bearing, 164, 166 is a gear, 16
8 is a shaft, 170 is a resolver, 176 is a tape reader, 1
78 is a data processing circuit, 180 is a magnetic core storage device, 182
is the shaft, 184 is the tachometer, 186 is the resolver, 188
is the axis line intervolator, 190 is the error tracking counter, 1
92 is a feedback counter and oscillator, 194 is a digital-to-analog converter, 196 is a drive amplifier, 19
8 is an axis line intervolator, 200 is an error tracking counter,
202 is a feedback counter and oscillator, 204
is a digital-to-analog converter, 206 is a drive amplifier, 2
08 is tachometer, 210 is resolver, 212-216
is a slip ring-brush connection, 218 is an axial intabolator, 220 is an error tracking counter, 222 is a feedback counter and oscillator, 224 is a digital-to-analog converter, 226 is a drive amplifier, 228 is a tachometer, and 230-234 are slips. Ring-brush connection, 23
6 is an inporator, 238 is an error driven counter, 24
0 is feedback and oscillator, 242 is digital
Analog converter, 246 is a drive amplifier, 248 is a tachometer, 250 is a resolver, 252° 254 is a tool holder, 256, 258 is a cutter, 260 is a flat surface, 262
is the workpiece, 264 is the installation odor, 265 is the memory part, 266
is a pallet, 267 is a storage part, 268 is a flange rim, 270 is an outer surface, 272 is a curved surface, 2γ4 is a transition point, 2
76-282 is a fixed tool holder, and 284-290 is a slot.

Claims (1)

[Scope of Claims] 1. A machine tool for cutting a workpiece, including a rotatable workpiece table adapted to receive the workpiece to be machined, and a rotatable workpiece table on each side of the rotatable workpiece table. a rotating tool head provided, a separate power unit coupled to rotate each of said tool heads independently of the other tool head; a power-operated feed device mounted on each of said tool heads for linear movement relative to the axis of rotation toward and away from the table; a power-operated feed carriage movable with respect to the tool head; a cutter mounted on each of said feed carriages and capable of rotating in a trajectory having a diameter dependent on the position of said feed carriage with respect to the axis of its associated tool head; are coupled to independently and simultaneously control each of the and its associated feedstock operations to cause the machining operations of one program to occur on one side of the workpiece and simultaneously cause the machining operations of a different program to occur on the opposite side of the workpiece. and a control device configured to complete one set of machining operations by causing machining operations of the same program to be performed on different sides of the workpiece after rotating the workpiece table. 2. The machine tool according to claim 1, wherein the cutting tool changes the diameter of its trajectory by automatically adjusting the rotational speed of the tool head when its associated feed carriage is moved. A machine tool having a control device adapted to maintain a constant surface speed along the workpiece at times. 3. A machine tool according to claim 2, in which a constant thickness of chips removed from the workpiece by the cutting tool. A machine tool having a control device that automatically adjusts the moving speed of the feed table while adjusting the rotational speed of the tool head so as to maintain the rotational speed of the tool head.