JPH06307966A - Method and system for achieving rotary balance - Google Patents

Abstract

PURPOSE:To improve the external view of product while saving manhour and the process by subjecting a work to rotary balance test to determine the vector of unbalance weight and then machining the work into an eccentric circle or a noncircle thereby eliminating the unbalance weight. CONSTITUTION:A tool 40 is retracted upon finish of machining thus rendering the bearings 27, 27a movable. When a work 1 is fixed with weights at the opposite ends thereof and rotated at high speed, the work 1 is unbalanced to generate vibration which is detected by vibration detectors 29, 29a. An unbalance operating circuit 10 then calculates the vector value of unbalance weight which is fed to a high speed operation CNC controller 3. The CNC controller 3 drives an X-axis servo motor 21 and a Z-axis servo motor 25 to secure the work 1, from which the unbalance weight must be removed, to the bearings 27, 27a and then the tool 40 is advanced and the work 1 is rotated. The CNC controller 3 controls a servo motor 11 not in proportion to the rotational angle of the work 1 but to regulate the phase in the rotational direction thus removing the part corresponding to the unbalance weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for rotational balancing, and more particularly to a method for removing the unbalanced weight after detecting the unbalanced weight and a processing means capable of removing the unbalanced weight. Rotational balancing device.

[0002]

2. Description of the Related Art A rotating body of a rotary machine is usually cut by a lathe into a cylindrical shape or a non-cylindrical shape, or is then ground by a grinder, and after this cutting or even grinding, a particular unbalance is corrected. To do this, remove the rotating body (hereinafter referred to as the work piece) from the lathe or grinder, attach this work piece to the balance tester, and rotate the work piece to support the work piece. The unbalanced weight is removed from the machine by measuring the unbalanced weight and its phase by detecting the vibration or the force applied to the bearing by the detector, and the unbalanced material is removed by drilling to balance the workpiece. There is.

[0003]

In order to carry out a balance test, for example, a work piece is removed from a lathe and carried to a balance test machine, and the work piece is mounted on the balance test machine to perform a balance test. It is carried and the unbalanced weight is removed by drilling. Therefore, (1) many attachments and detachments increase the man-hour process. The total processing time will be long if mounting and dismounting are added. (2) Installing a drilling machine and a balance tester requires a large installation floor area. (3) Since there is a hole in the outer peripheral portion of the workpiece due to the drilling, it has a bad appearance and may cause another object to be caught during rotation, which may be a safety issue.

Among the above, (1) increase in man-hour process and (2) large floor area can be solved by mounting a drill head on a balance tester, but (3) unbalanced weight is removed. Drill holes remain, it looks bad,
It may not be possible to solve the problem that may cause a safety problem because it may trigger other things to be involved during rotation.

The present invention requires a small number of steps, steps, and an installation area,
An object of the present invention is to provide a method and a rotary balancing apparatus for taking a rotary balance having a good appearance of a workpiece and having a safety test function even if the workpiece is rotated and having a safety problem and a non-circular machining function.

[0006]

The first aspect of the present invention is a method for balancing the rotation of a workpiece having a processing portion to be machined by turning or grinding into a cylindrical shape or a non-cylindrical shape. Obtain the vector value of the unbalanced weight by applying a rotary balance tester, then attach this work piece to a lathe or grinder capable of non-circular processing, and machine the machining point of the work piece into an eccentric circle or non-circle, This processing is to remove the unbalanced weight, and is a method of removing the rotational balance.

A second aspect of the present invention is characterized in that the method of balancing the rotational balance according to the first aspect of the present invention is repeatedly performed, and the positions in the circumferential direction at which the unbalanced weight is removed each time are set in different circumferential positions. This is a method of balancing the rotation.

A third invention of the present invention is a turning machine capable of non-circular machining, comprising control means capable of controlling the amount of advance / retreat of the tool base in the radial direction of the workpiece according to the rotation angle of the workpiece spindle. , A vibration detecting means for detecting vibrations due to the unbalance of the workpiece on the workpiece headstock that rotatably supports the workpiece spindle and a rotation angle detecting means for the workpiece, and a signal detected by the vibration detecting means. , The signal detected by the workpiece rotation angle detection means is input, the vector value of the unbalanced weight of the workpiece is calculated, and the unbalanced weight part of the workpiece is machined into an eccentric circle or a non-circle and removed. As described above, the rotary balancing apparatus is provided with the control means for moving the tool base forward and backward in the radial direction of the workpiece.

According to a fourth aspect of the present invention, there is provided a spindle bearing for supporting both ends of a cylindrical or non-cylindrical workpiece and a tailstock shaft, and a spindle bearing for rotatably supporting the workpiece spindle, and a spindle. A headstock bearing supporting means for fixing the bearing during machining of the workpiece, and movably supporting this during the balance test so as to detect the vibration or force due to the unbalance of the workpiece applied to this bearing. , The workpiece spindle drive, the tailstock bearing that rotatably supports the tailstock spindle, and the tailstock bearing are fixed during machining of the workpiece, and this fixation is released during the equilibrium test. Tailstock bearing support means that movably supports so as to detect vibration or force due to the unbalance of the workpiece applied to the base bearing, and vibration or force detection provided on each of the headstock and tailstock bearing support means. Device, eccentric processing means, and the vibration It has a balance calculation circuit that calculates the unbalanced weight of the work piece by the output device or force detector, and a control means that removes the unbalanced weight calculated by this calculation circuit by eccentric processing, and corrects the unbalance of the work piece. It is a rotary balancing device characterized in that.

A fifth aspect of the present invention is provided with a grasping means for grasping one end of a cylindrical workpiece and a workpiece spindle for supporting the workpiece, and the workpiece spindle is rotatably supported. The main shaft bearing and the main shaft bearing are fixed during machining of the workpiece, and the spindle is movably supported so as to detect the vibration or force due to the unbalance of the workpiece applied to this bearing by releasing this fixation during the balance test. Table bearing support means, workpiece spindle drive device, vibration or force detectors respectively arranged on the spindle bearing support means, eccentric machining means, and the unbalanced weight of the workpiece by the vibration detector or force detector. Is a balance balancing device for correcting the unbalance of a workpiece by having a balance calculating circuit for determining the unbalance weight and a control means for removing the unbalance weight calculated by the calculating circuit by eccentric machining.

A sixth aspect of the present invention is the third, fourth or fifth aspect characterized in that it is provided with circular processing means for the workpiece.
The rotary balancing device according to the invention.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

Example 1 FIG. 1 is a flow sheet.
The workpiece 1 and the camshaft 2 are numerically controlled by a numerical controller, for example, high-speed operation CN
The C control device 3 rotates in association with each other as follows. The workpiece 1 has one end fixed to a tool grasping drive means, for example, a chuck 6 fixed to a spindle head of a workpiece spindle 5 mounted on a spindle stock 4, and supported by a tailstock center 8 provided on a tailstock 7. ing. An encoder 9 for detecting the rotation angle of the main shaft 5 is arranged so as to detect the rotation angle of the main shaft 5, and the pulse signal detected by the encoder 9 is input to the high-speed arithmetic CNC control device 3 and the balance arithmetic circuit 10. Has become.

The high-speed arithmetic CNC control device 3 performs a signal predictive control according to the detected rotation angle of the workpiece 1 so as to form a desired contour of the workpiece 1, and thereby the high response servomotor 11 is provided.
It is designed to be sent to. The servomotor 11 is connected to a camshaft 2 which is supported by bearings provided on the front and rear slides 12. An eccentric cam plate 13 having an eccentricity r is attached to the cam shaft 2.

A disk-shaped cam follower 17 is rotatably attached to an upper slide 16 that moves in the radial direction of the workpiece 1 so as to follow the eccentric cam plate 13 with the spring force of a spring 14. The upper slide 16 is slidably engaged with a saddle 18 in the radial direction (X direction) of the workpiece 1. The spring 14 has one end locked to the saddle 18 and the other end locked to the upper slide 16, and biases the cam follower 17 toward the eccentric cam plate 13 in the figure.

The saddle 18 is movably engaged with a left and right slide base 19 provided with a guide in the same direction (Z direction) as the axial direction of the workpiece 1. The saddle 18 advances and retreats on the base 19 by a servo motor 21 attached to the base 19 and a screw feeder 22 connected to the servo motor 21. The servo motor 21 is controlled by the high-speed arithmetic CNC controller 3.

FIG. 2 is a diagram showing the lift X of the cam follower 17 by the eccentric cam plate 13. The horizontal axis represents the rotation angle θ of the cam shaft 2, and the vertical axis represents the lift X of the cam follower 17. In the figure, 23 is a curve showing the lift by the eccentric cam plate 13. The eccentricity of the eccentric cam plate 13 is r, and the cam follower 1
If the lift of 7 is X, X≈r sin θ, but if θ is small, X≈rθ. Therefore, in the embodiment, when the eccentricity of the eccentric cam plate 13 is r, the rotation angle of the cam shaft 2 is small. The relationship between the rotation angle θ between the angles 0 and θ1 and the movement amount X of the upper slide 16 can be treated as linear. The portion deviating from the linear shape can be machined by correcting the rotation angle θ, but by using the eccentric cam plate 13 in which the eccentricity amount r is changed according to the required machining accuracy and the desired movement amount, no extra correction is required.

A left and right slide base 19 is fixed on the front and rear slides 12. Front and back slide 12 is the work piece 1
It slides on the front and rear slide bases 24 in the radial direction of
A servo motor 25 fixed to the rear end of the front-rear slide base 24 advances and retracts via a screw feeder 26. The servo motor 25 is controlled by the high-speed arithmetic CNC controller 3.

The workpiece main shaft 5 is connected to a drive shaft 36 via a universal joint 35, and the drive shaft 36 is rotatably supported by a stationary bearing (not shown). A pulley 37 fixed to the drive shaft 36 is driven by a motor (not shown) via a power transmission device.

The work spindle 5 is supported by a spindle bearing 27. As shown in FIG. 3, the spindle bearing 27 has an upper end suspended from an Eden spring 28 fixed to the work headstock 4.
The vibration detector 2 detects the vibration of the main shaft bearing 27.
9 is provided. A pressing device 3 such as a screw feeder or a hydraulic cylinder that propels the ram 30 toward the bearing 27 for fixing the spindle bearing 27 to the workpiece headstock 4 during cutting.
1 is fixed to a work headstock 4. The rotation center 8 is fixed to the tip of the tailstock shaft 32. The tailstock shaft 32 is similarly supported on the same center line as the workpiece main shaft 5 on the headstock 4 side, and the tailstock shaft bearing 27a supports the tailstock shaft 32 and the tailstock shaft bearing 27a. Is supported on the tailstock body 34 by the Eden spring 33 as shown in FIG. In addition, the tailstock body 3 is the same as in the workpiece headstock 5.
4 includes a vibration detector 29a, a ram 30a, and a pressing device 31a.
Equipped with.

The output signals of the vibration detectors 29, 29a for detecting the vibrations of the bearings 27, 27a on the headstock and tailstock side are input to the balance calculation circuit 10. The balance calculation circuit 10 inputs the signals of the vibration detectors 29, 29a and receives the vector U of the unbalanced weights at both ends of the workpiece 1 from the vibration of the bearings 27, 27a on the headstock and tailstock side.
1, U2 is obtained and sent to the high speed operation CNC control device 3. The high speed operation CNC control device 3 sends the saddle 18 in the Z direction based on the vectors U1 and U2, and controls the eccentric cam plate 13 by the high response servomotor 11 so as to successively eliminate the unbalance. There is.

Next, the operation of the above configuration will be described. In the present embodiment, the workpiece 1 is turned to be circular or non-circular in each axial cross section, but the circular machining is performed. When this processing is performed, the rams 30 and 30a are advanced by the pressing devices 31 and 31a to fix the bearings 27 and 27a on the headstock side and the tailstock side. The high response servomotor 11 is stopped at the position of the lift 0 where the eccentric cam plate 13 can be used as a linear relationship between the rotation angle and the lift, and the high speed operation CNC control device 3 locks the high response servomotor 11. There is.

The workpiece 1 is grasped by the chuck 6, supported by the tailstock center 8, and the rotation is transmitted from the motor (not shown) to the pulley 37 through the power transmission device.
Chuck 6, work piece 1, tailstock center 8, tailstock shaft 32
Rotates. The CNC control device 3 drives the Z-axis servo motor 21 and the X-axis servo motor 25 to machine the pre-programmed workpiece 1 into a desired shape, and the Z-axis servo motor 21 drives the screw feed device 22 to drive it. Z saddle 18
Axial feed is performed, and in association with this Z-axis feed, the X-axis servomotor 25 causes the screw slide device 26 to move the slide 1 forward and backward.
Go back and forth 2. The high response servomotor 11 remains stopped at the position of the reference lift (position where lift 0 is set) of the eccentric cam plate 13. The upper slide 16 moves back and forth together with the front-rear slide 12, and the cutting tool 40 fixed to the upper slide 16 turns the workpiece 1 into a desired shape. Workpiece 1
Each cross section of is a circle. After this processing is completed, the cutting tool 40 is retracted to balance the workpiece 1. When the work piece 1 is to be rotationally balanced, the cutting tool 40 is retracted when the machining is completed, and then the pressing devices 31, 31a retract the rams 30, 30a. Since the present example is a soft type balance test, test weights γ and δ are attached to both ends of the work piece 1, and the work piece 1 is rotated at a high speed at a rotation speed suitable for the balance test different from that at the time of processing. If the workpiece 1 is unbalanced, it vibrates according to the unbalance, and the vibration speed is the vibration detector 2
It is detected at 9, 29a. This detected value is input to the balance calculation circuit 10. At the same time, the encoder 9 detects the rotational position of the workpiece 1 and inputs it to the balance calculation circuit 10.

The balance calculating circuit 10 finds the constant of this measuring system, sets the calculating circuit, then removes the test weight and rotates the workpiece 1 in the same manner, so that the balance calculating circuit 10 has U1 = γ1 (XA- δ1 · XB) U2 = γ2 (−δ2 · XA + XB) However, γ1, γ2, δ1, δ2 Constant weight obtained by adding test weights XA Vibration speed detected by vibration detector 29 XB Vibration detected by vibration detector 29a For the speeds U1 and U2, a vector value of unbalanced weight is calculated, and the calculated value is input to the high speed calculation CNC controller 3. Next, the high-speed operation CNC control device 3 drives the Z-axis servo motor 21 and the X-axis servo motor 25 to move the cutting tool 40 to a position on the headstock 4 side of the workpiece 1 from which the unbalanced weight U1 should be removed. Here, the workpiece 1 is speed-changed to a rotation speed suitable for non-circular machining, and when the workpiece 1 rotates, the rotation angle is detected by the encoder 9 and the high-speed calculation CN
It is input to the C control device 3. High-speed arithmetic CNC controller 3
Causes the servo motor 11 to swing once within a range of the rotation angle θ1 (see FIG. 2) for one rotation of the workpiece 1. As a result, the eccentric cam plate 13 also rotates forward and backward by the same angle θ1 to move the cam follower 17 forward against the spring 14 and the cutting force, and retreat by the spring force of the spring 14 to reciprocate the upper slide 16. As a result, the cutting tool 40 fixed to the tool rest on the upper slide 16 cuts the outer periphery of the workpiece 1. Here, when the high-speed calculation CNC control device 3 rotates the servo motor 11 in proportion to the input from the encoder 9, the workpiece 1
In accordance with the moving amount X of the cutting tool 40 whose radius changes linearly with respect to the rotation angle as shown exaggeratedly in FIG.
A non-circular cross section Q with a spiral shape is completed. That is,
It is possible to remove the portion 39 corresponding to the unbalanced weight shaded from the perfect circle 38.

In the above, the high speed operation CNC controller 3
The control of the servo motor 11 by means of is corrected and output so as to advance or retreat the phase in the rotation direction without making it proportional to the rotation angle of the workpiece 1, and outputs a continuous contour such as an ellipse or parabola of any shape. It becomes possible to process a part of it.

With respect to the rotation of the workpiece 1, the high-speed arithmetic CNC numerical control device 3 drives the Z-axis servo motor 21 to a fixed amount to feed the saddle 18 in the Z direction via the screw feed device 22, and When the range of the rotation angle θ1 of the servo motor 11 is sequentially changed, for example, the workpiece 1 can be sequentially changed in the longitudinal direction such that it has a drum shape or a drum shape.

In performing such non-circular eccentric machining, the high speed operation CNC control unit 3 has a small radius on the side of the unbalanced weight U1 so as to cancel the unbalanced weight U1 and a radius on the opposite side of 180 degrees. Process so that it becomes large (including the case of not cutting). Further, by gradually approaching the circular outer circumference of the workpiece 1 which has already been processed in proportion to the feed length of the Z-axis servomotor 21, it is possible to eliminate the unbalance without generating a step. Similarly, the unbalanced weight U2 is removed.

[Embodiment 2] In Embodiment 1, the unbalanced weight of the workpiece is detected by the vibration detector, but as shown in FIG. 6, a force detector 41 incorporating a piezoelectric element instead of the vibration detector 41 is used. May be used. In this case as well, the rams 30 and 30a and the pressing devices 31 and 31a do not necessarily convert the case of detecting unbalance and the case of cutting and removing, but can cope with the case where the amount of unbalance is small.

Example 3 This example is suitable for balancing a flat disk-shaped workpiece such as a flywheel. As shown in FIG. 7, except that the tailstock is not provided, as shown in FIG.
The same functions as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The saddle 18 is provided with a tool rest 43 for cutting the end face and the outer periphery of the workpiece 1, and a cutting tool 44 is provided obliquely.
The Z-axis servomotor 21 and the X-axis servomotor 25 are associated with each other by the CNC control device 3 when the workpiece 1 is cut. After the completion of the cutting, a balance test is performed, and then the cutting tool 40 is moved to a position on the outer circumference of the workpiece 1, and the workpiece 1 is subjected to non-circular eccentric machining to balance the workpiece 1.

[Embodiment 4] Each of the above embodiments enables cylindrical processing of a workpiece. However, it is more efficient to cut the crankshaft journal portion, the pin portion, the camshaft cam portion, and the journal portion separately from the crankshaft and camshaft with a dedicated processing machine. In such a case, the balance tester is the same as that of the above-described embodiment, and the capacity of the X-axis servomotor 25 is reduced,
Alternatively, the screw feeding device 26 may be a manual one.

In the embodiment, as a non-circular eccentric machining means, a combination of an eccentric cam and a CNC control device is used to displace the cam follower toward the workpiece against the spring, and the cam controls the rotation angle by the numerical control. Since it can be additionally rotated, the correction to the cross-sectional shape of the machined workpiece is the magnitude of the deviation from the motion characteristics of the cam, and therefore its value is small and it is suitable for high-speed machining. Even if the machining shape is changed, it can be easily adapted by changing the NC program. Further, by using the eccentric cam as the cam, it is easy to manufacture the cam, and practically high accuracy is secured.

However, the eccentric machining means is not limited to the embodiment, the encoder 9 detects the rotation angle of the workpiece 1, and the slide 16 is used as a fixed tool stand in the above embodiment without using a cam. , X-axis servo motor 25
Is driven according to the rotation angle of the workpiece 1, and the screw feed device 26
The non-circular processing may be performed by moving the front and rear slides 12 back and forth via.

In the embodiment, the unbalanced weight is removed by the non-circular eccentric processing, but it goes without saying that the unbalanced weight may be removed by the circular eccentric processing.

[Embodiment 5] FIG. 8 is a flow sheet.
One end of the work 1 is fixed to a tool grasping drive means, for example, a chuck 6, which is fixed to a spindle head of a work spindle 5 mounted on a headstock 4. An encoder 9 for detecting the rotation angle of the main shaft 5 is arranged so as to detect the rotation angle of the main shaft 5, and the pulse signal detected by the encoder 9 is input to the high-speed arithmetic CNC control device 3 and the balance arithmetic circuit 10. Has become.

The high speed operation CNC control device 3 performs a signal predictive control according to the detected rotation angle of the workpiece 1 so as to form a desired contour of the workpiece 1, and thereby the high response servomotor 25 is operated.
It is designed to be sent to.

The saddle 18 is movably engaged with a left and right slide base 19 provided with a guide in the same direction (Z direction) as the axial direction of the workpiece 1. The saddle 18 advances and retreats on the base 19 by a servo motor 21 attached to the base 19 and a screw feeder 22 connected to the servo motor 21. The servo motor 21 is controlled by the high-speed arithmetic CNC controller 3. A left and right slide base 19 is fixed on the front and rear slides 12. The front-rear slide 12 slides on a front-rear slide base 24 in the radial direction of the workpiece 1, and is advanced and retracted via a screw feed device 26 by a servomotor 25 fixed to the rear end of the front-rear slide base 24. The servo motor 25 is controlled by the high-speed arithmetic CNC controller 3. The pulley 37 fixed to the work spindle 5 is driven by a motor (not shown) via a power transmission device.

The work spindle 5 is supported by a spindle bearing 27. The spindle bearing 27 is fixed to the work headstock 4. A vibration detector 29 is provided to detect the vibration of the work headstock.

Vibration detector 29 for detecting the vibration of the headstock 5.
The output signal of is input to the balance calculation circuit 10. The balance calculating circuit 10 inputs a signal from the vibration detector 29 to obtain a vector U of the rotationally unbalanced weight of the workpiece 1 from the vibration of the headstock 5 and sends it to the high speed calculating CNC control unit 3. The high speed operation CNC control device 3 sends the saddle 18 in the Z direction based on the vector U, and controls the front / rear slide 12 by the high response servo motor 25 so as to successively eliminate the unbalance.

Next, the operation of the above configuration will be described. In the present embodiment, the work 1 is first turned to be circular or non-circular in each axial cross section.

The workpiece 1 is grasped and supported by the chuck 6,
Pulley 3 from a motor (not shown) via a power transmission device
The rotation is transmitted to the workpiece 7, and the workpiece spindle 5, the chuck 6, and the workpiece 1 rotate. The CNC control device 3 drives the Z-axis servo motor 21 and the X-axis servo motor 25 to machine the pre-programmed workpiece 1 into a desired shape, and the Z-axis servo motor 21 drives the screw feed device 22 to drive it. Saddle 18
In the Z-axis direction, and in association with this Z-axis feed, the X-axis servomotor 25 moves the forward / backward slide 12 back and forth via the screw feed device 26. Tool stand 1 fixed to the saddle 18
6A moves back and forth as the front and rear slides 12 move back and forth, and the tool base 1
The cutting tool 40 fixed to 6A turns the workpiece 1 into a desired shape. Each cross section of the work piece 1 is circular or non-circular. After this processing is completed, the cutting tool 40 is retracted to balance the workpiece 1. When the workpiece 1 is to be rotationally balanced, the cutting tool 40 is retracted at the same time as the machining is completed. The workpiece 1 is rotated at a high speed at a rotation speed suitable for the equilibrium test different from that during the processing. If the workpiece 1 is unbalanced, it vibrates according to the unbalance, and the vibration speed is the vibration detector 29.
Detected in. This detected value is input to the balance calculation circuit 10. At the same time, the encoder 9 detects the rotational position of the workpiece 1 and inputs it to the balance calculation circuit 10.

The balance calculating circuit 10 obtains the belt value of the rotationally unbalanced weight of the workpiece 1, calculates the shape of the workpiece 1 that takes the rotationally unbalanced weight, and calculates the value at high speed C
Input to the NC control device 3. Next, the high-speed operation CNC control device 3 drives the Z-axis servo motor 21 and the X-axis servo motor 25 to move the cutting tool 40 to a position on the headstock 4 side of the workpiece 1 where the unbalanced weight U should be removed. Here, the workpiece 1 is speed-changed to a rotation speed suitable for non-circular eccentric machining,
When the workpiece 1 rotates, its rotation angle is input to the high-speed arithmetic CNC controller 3 detected by the encoder 9. The high-speed operation CNC controller 3 makes X for one rotation of the workpiece 1.
The axial servo motor 25 is rotated in the forward and reverse directions to reciprocate the front and rear slides 12. As a result, the cutting tool 40 fixed to the tool base 16A cuts the outer periphery of the workpiece 1. Here, when the high-speed arithmetic CNC control device 3 rotates the X-axis servomotor 25 in association with the input from the encoder 9, the workpiece 1 has a radius X that changes with respect to the rotation angle of the workpiece 40. A non-circular cross section is completed.

Thus, the rotationally unbalanced weight of the work piece 1 can be removed. The same procedure is repeated to further improve the accuracy of rotational imbalance. The position where the unbalanced weight is removed for the second time is a position different in the circumferential direction of the workpiece. For example, on both sides of the position across the diameter of the workpiece, that is,
It suffices if the positions are different by 180 degrees with respect to the workpiece 1 captured by the encoder.

[Embodiment 6] Each of the above-described embodiments provides a rotary balancing apparatus of a type in which a balance testing machine and a lathe are combined. This example provides a method for taking a new rotary balance using a known balance tester and an eccentricity machine, respectively.

A processed product having a circularly processed part with a lathe, a grinder, etc. is subjected to a rotary balance tester. This rotary balance tester may be selected depending on the weight of the workpiece and the unbalance detection limit, and either a non-rotating static gravity type, a soft bearing type, or a hard bearing type centrifugal force type is used.
The unbalance vector obtained by this balance testing machine is input to the high speed operation CNC control unit 3 in FIG.
FIG. 9 shows a turning machine capable of non-circular eccentricity or circular eccentricity machining already shown in each embodiment. Since the description of each part and the operation thereof have already been described in each embodiment, the same reference numerals are given and the description thereof is omitted. The high-speed arithmetic CNC control device 3 is adapted to automatically calculate a program for controlling the high-speed servomotor 11 in accordance with the input unbalanced vector.

In the embodiment, a tool is used as a tool, but it goes without saying that a grindstone base using a cylindrical grindstone or a unit using a milling machine may be provided on the upper slide for grinding or milling.

In the above, the high speed operation CNC controller 3
The control of the servo motor 11 by means of is corrected and output so as to advance or retreat the phase in the rotation direction without making it proportional to the rotation angle of the workpiece 1, and outputs a continuous contour such as an ellipse or parabola of any shape. It becomes possible to process a part of it.

With respect to the rotation of the workpiece 1, the high-speed arithmetic CNC control device 3 drives the Z-axis servomotor 21 to a fixed amount to feed the saddle 18 in the Z direction via the screw feed device 22, and at the same time, performs servo control. When the range of the rotation angle θ1 of the motor 11 is sequentially changed, for example, the workpiece 1 can be sequentially changed in the longitudinal direction like a drum shape or a drum shape.

In performing such non-circular eccentric machining, the high speed operation CNC control device 3 has a small radius on the side of the unbalanced weight U1 so as to cancel the unbalanced weight U1 and a radius on the opposite side of 180 degrees. Process so that it becomes large (including the case of not cutting). Further, by gradually approaching the circular outer circumference of the workpiece 1 which has already been processed in proportion to the feed length of the Z-axis servomotor 21, it is possible to eliminate the unbalance without generating a step. Similarly, the unbalanced weight U2 is removed.

[0050]

According to the first aspect of the present invention, since the unbalance weight is obtained by the balance tester and the unbalance is corrected by the machine capable of eccentricity processing, the trace of removing the unbalance weight after the correction is not found. , It looks good, and there is less chance that other things will get caught around the unbalance correction mark during rotation.

In the second invention of the present invention, the method of balancing the rotational balance of the first invention is repeatedly executed, so that the rotational balance accuracy is improved.

According to the third aspect of the present invention, the vibration detecting means for detecting the vibration due to the unbalance of the workpiece on the workpiece headstock and the rotation angle detecting means for the workpiece are provided, and these are used. The vector value of unbalanced weight of
Since the control means for non-circularly machining the workpiece is provided so as to remove the unbalanced weight, it becomes possible to use the machine tool capable of non-circular machining as the apparatus main body.

According to a fourth aspect of the present invention, the bearings of the respective shafts supporting both ends of the workpiece are movable so that vibration or force can be measured, and can be fixed so as to withstand the cutting or grinding force. Processing means For example, a device for turning or grinding the outer circumference capable of eccentric processing is provided, and a balance arithmetic circuit for detecting a vector of unbalance weight by detecting vibration or force is provided, and the calculation result of this arithmetic circuit is used as the eccentric machining means. Since the unbalance is corrected by inputting it, in the case of a workpiece that supports both ends, it is possible to perform the balancing test and the unbalance correction in the same mounting state, and the surface of the workpiece after correction is beautiful and other There is little risk of wrapping around.

A fifth aspect of the present invention is provided with a grasping means for grasping one end of the workpiece, and the bearing for supporting the main shaft provided with this grasping means is movable so that vibration or force can be measured. In addition, it can be fixed so as to withstand the cutting or grinding force, eccentric processing means is provided, and a balance calculation circuit for detecting the unbalanced weight vector by detecting vibration or force is provided, and the calculation result of this calculation circuit is Since the unbalance is corrected by inputting it into the eccentric machining means, in the case of a workpiece that is supported by cantilever only by chucking, it is possible to perform the balance test and the unbalance correction in the same mounting state, and to correct it. The surface of the work piece after is beautiful, and there is little risk that other things will be wrapped around.

The sixth invention of the present invention is the third, fourth or fifth invention, further comprising a machining means for machining the workpiece into a circular shape. Therefore, after turning or grinding the cylindrical shape or the cylindrical end surface, the workpiece is processed. The unbalance can be corrected by carrying out a balance test with the attached.

[Brief description of drawings]

FIG. 1 is a flow sheet of Example 1 of the present invention.

FIG. 2 is a cam diagram in FIG.

FIG. 3 is a vertical cross-sectional view of the workpiece main shaft bearing portion of FIG.

4 is a vertical sectional view of the tailstock bearing portion of FIG. 1. FIG.

FIG. 5 is a cross-sectional view perpendicular to the axis of the eccentric processed workpiece.

FIG. 6 is a vertical cross-sectional view of a second embodiment in which a work force spindle bearing portion and a tailstock bearing portion in FIG. 1 are provided with hard type force detectors.

FIG. 7 is a flow sheet of Example 3 of the present invention.

FIG. 8 is a flow sheet of Example 5 of the present invention.

FIG. 9 is a flow sheet of Example 6 of the present invention.

[Explanation of symbols]

 1 Workpiece 2 Camshaft 3 High-speed calculation CNC controller 4 Spindle head 5 Spindle 7 Tailstock 9 Encoder 10 Balance calculation circuit 11 Servomotor 13 Eccentric cam plate 17 Cam follower 27, 27a Bearing 28 Eden spring 29 Vibration detector 41 Force detection vessel

Claims (6)

[Claims] 1. In a method of rotationally balancing a workpiece having a processing portion to be machined by turning or grinding into a cylindrical shape or a non-cylindrical shape, the processed workpiece is subjected to a rotational balance tester to obtain a vector value of unbalanced weight. Then, this work piece is attached to a lathe or grinder capable of non-circular processing, and the processing point of the work piece is processed into an eccentric circle or a non-circular shape, and this processing removes the unbalanced weight. A characteristic method to balance rotation. 2. A method of balancing rotations according to claim 1, wherein the method of balancing the rotations according to claim 1 is repeated to set different circumferential positions for removing unbalanced weights each time. 3. A non-circular machined turning machine equipped with a control means capable of controlling the amount of advance / retreat of a tool base in the radial direction of a workpiece according to the rotation angle of the workpiece spindle, in which the workpiece spindle is rotated. Provided are a vibration detection means for detecting vibrations due to unbalance of the workpiece on the workpiece headstock that is freely supported and a rotation angle detection means for the workpiece, and a signal detected by the vibration detection means and a workpiece rotation angle detection. The signal detected by the means is input, the vector value of the unbalanced weight of the workpiece is calculated, and the tool base is machined so that the unbalanced weight part of the workpiece is machined into an eccentric circle or a non-circle and removed. A rotary balancing device, characterized in that a control means for advancing and retracting in the radial direction of the object is provided. 4. A spindle bearing, which includes a workpiece spindle supporting both ends of a cylindrical or non-cylindrical workpiece and a tailstock shaft, rotatably supporting the workpiece spindle, and machining the spindle bearing. Headstock bearing support means that is fixed at time and is movably supported so as to detect vibration or force based on the unbalance of the workpiece applied to this bearing by releasing this fixation during the balance test, and a drive device for the workpiece spindle. , The tailstock bearing that rotatably supports the tailstock spindle, and the tailstock bearing are fixed during machining of the workpiece, and this fixation is released during the balance test and the workpiece is added to the tailstock bearing. A tailstock bearing supporting means movably supported so as to detect vibration or force based on unbalance, a vibration or force detector respectively arranged on the headstock and tailstock bearing supporting means, and an eccentricity machining means , By the vibration detector or force detector The machine has a balance calculation circuit that calculates the unbalanced weight of the workpiece and a control means that removes the unbalanced weight calculated by this calculation circuit by eccentric processing. Balancing device. 5. A main shaft bearing that includes a workpiece main shaft that supports the workpiece, and a main shaft bearing that rotatably supports the main workpiece, and a main shaft bearing that are provided with a grasping unit that grasps one end of the workpiece. A headstock bearing supporting means that is fixed during machining of a workpiece and is movably supported so as to detect vibration or force based on the unbalance of the workpiece that is released from this fixation during a balance test and is detected. A drive device for the main shaft, a vibration or force detector respectively arranged on the main shaft bearing support means, an eccentricity processing means, a balance calculation circuit for obtaining the unbalanced weight of the workpiece by the vibration detector or the force detector, A rotary balancing device having a control means for removing the unbalanced weight calculated by an arithmetic circuit by eccentricity processing, and correcting the unbalance of a workpiece. 6. The rotary balancing device according to claim 3, 4 or 5, further comprising circular processing means for the workpiece.