JPH0493104A - Drill diameter regulating device for boring device - Google Patents

Abstract

PURPOSE:To achieve precise adjustment of drill diameter in a simple operation by correcting the drive of a driving means which is controlled by a controlling means based on the preset error correction ratio. CONSTITUTION:Pulse signals with a constant pulse number are transmitted to a stepping motor 38 so that actual variation of a drill diameter is measured, then an error correction ratio is obtained in comparison with the reference value and setting is made by means of an adjusted error correction ratio setting device 61. The displacement of the drill from the reference position is inputted into an adjusted data setting device 60 in the form of pulse number, causing a pulse generator 62 to output signals and also a comparator 66 to be inputted. The pulse generator 62 transmits the signals to the stepping motor 38 to drive, and screws, shafts and rods to be moved forward and/or backward, giving the drill a displacement from the home position in the radial direction of a boring bar. The rotation of the stepping motor 38 is detected by means of a potentiometer 40, but the value adjusted by the error quantity by means of an analogue value adjustor 63 is set as a detected drive value, inputted in the comparator 66 consecutively and corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for automatically adjusting the diameter of a cutter in a boring machine.

[Prior Art] Conventionally, the diameter of a cutting tool in a boring machine has been manually adjusted using a dial gauge or the like, but in recent years, various devices have been provided to automate this process.

FIG. 6 shows an example of an automatic blade diameter adjustment device in such a boring machine. The boring bar 90 shown in the figure is driven to rotate around a white axis by a motor (not shown), and a cutting tool 9 is attached to the end of the boring bar 90.
1 is mounted so as to be movable in the radial direction of the boring bar 90. An adjustment rod 93 having a cam 92 fixed to its tip is housed in the boring bar 90 so as to be movable in the axial direction, and the adjustment rod 93 is biased rearward (to the right in the figure) by a compression spring 94. . An inclined surface (cam surface) 921 is formed at the tip of the cam 92, and a moving pin 95 is mounted at a position in contact with this inclined surface 921.
2 and the adjusting rod 93 move back and forth, the moving pin 9
5 and the cutter 91 move together in the radial direction of the boring bar 90.

On the other hand, a stepping motor 96 is arranged at the rear of the device.
A master screw 97 is coupled to the drive shaft 961 via a key 98 so as to be movable in the axial direction, and a push rod 99 that contacts the adjustment rod 93 is fixed to the tip of the master screw 97. When the master screw 97 is rotationally driven by the stepping motor 96, the master screw 97 moves forward and pushes the adjustment rod 93 and the cam 92 forward, thereby moving the movable pin 95 and the cutter 91. The diameter of the blade changes. Therefore, by sending a pulse signal having a predetermined number of pulses to the stepping motor 96, the drive shaft 961 of the stepping motor 96 can be suspended accordingly.
rotates, and as a result, the cutter 91 is adjusted to a predetermined position.

[Problems to be Solved by the Invention] At the stage of manufacturing the above device, the amount of rotational drive of the stepping motor 96 (actually expressed in the number of pulses) is determined.
It is difficult to make the relationship between this amount of drive and the actual amount of movement of the cutter 91 in accordance with the design specifications, and errors occur between the two in actually manufactured products. For example, even if a device is designed with the aim of displacing the cutter 91 by a7m when a 100-pulse drive signal is output to the stepping motor 96, the actually manufactured device will not be able to achieve the above 100 pulses.
The displacement position of the blade 91 with respect to the pulse signal is not aJJJn, and in reality, there is some deviation between the two values. If such deviation is left unaddressed, accurate adjustment of the blade diameter will not be possible and high precision boring processing will not be possible.

Conventionally, therefore, the slope angle of the cam 92 was changed by cutting the slope 921 of the cam 92 after the device was assembled, or a transmission was installed in the stepping motor 96 to increase the amount of rotation of the drive shaft 961 relative to the number of pulses. Is the above-mentioned error corrected by making fine adjustments such as changing the This process must be repeated many times, which is a major hindrance to reducing manufacturing time. In addition, even when a transmission is attached, it is necessary to prepare a transmission with a gear ratio precise enough to correct the above-mentioned error, resulting in a large loss in the entire system.
Up is inevitable.

In view of these circumstances, the present invention has a low-cost structure,
It is an object of the present invention to provide a device that can easily and accurately adjust the diameter of a cutting tool.

[Means for Solving the Problems] The present invention provides a cutting tool mounted movably in the radial direction of a boring bar, a driving means for generating a driving force for moving the cutting tool, and a driving force of the driving means. a drive converter for moving the cutter according to the received signal; adjustment data setting means for setting data regarding the adjustment position of the cutter; and control for controlling the driving of the drive means based on the set adjustment data. and an error correction rate setting means for setting an error correction rate of the actual movement amount of the cutter relative to the drive amount of the drive means, and the set error correction and a correction means for correcting the drive amount of the drive means controlled by the control means based on the ratio (Claim 1).

Specifically, the control means includes an actuation means for actuating the drive means, a detection means for detecting the amount of drive of the drive means, and a detection means for detecting the amount of drive of the drive means, and the amount of detected drive is determined to be an amount corresponding to a preset target position adjustment amount of the cutter. and drive stop means for stopping the drive of the drive means when they become equal, and as the correction means, the detection means converts the drive amount actually detected by the detection means based on an error correction rate. (Claim 2) The control means includes actuating means for operating the driving means, detection means for detecting the driving amount of the driving means, and the detected driving amount is set as the driving amount. drive stop means for stopping the drive of the drive means when the amount becomes equal to the amount corresponding to a preset target position adjustment amount of the cutter; and the correction means is set by the adjustment data setting means. Further excellent effects can be expected in claim 3), further comprising target position adjustment amount changing means for setting the position adjustment amount converted based on the error correction rate as the target position adjustment amount.

(Function) According to the apparatus according to claim 1, the adjustment data setting means sets data regarding the desired blade position, and
By setting the deviation rate (error correction rate) of the actual movement amount of the cutter relative to the drive amount of the drive means by the error correction rate setting means, the drive amount of the drive means controlled by the control means according to this error correction rate. is corrected to match the actual blade position or the desired blade position.

Specifically, according to the apparatus of claim 2, the detected drive amount is set by converting the drive 'am detected by the detection means based on the error correction rate, and the detected drive amount and the target position adjustment amount are set as the detected drive amount. The error is corrected by performing drive stop control based on the comparison.

Further, in the apparatus according to claim 3, the target position adjustment amount is set by converting the position adjustment amount set by the adjustment data setting means into an error correction rate, and the target position adjustment amount and the detected drive amount are set as the target position adjustment amount. The error is corrected by performing drive stop control based on the comparison.

[Embodiment] FIG. 2 shows the overall configuration of a boring machine in an embodiment of the present invention.

A cylindrical main shaft 16 is supported on a base 10 of this device via bearings 12-14. A pulley 18 is fixed to the rear end of this main shaft 16, and this pulley 18 is connected to a drive source via a V-belt (not shown), and this drive source causes the main shaft 16 to rotate around its own axis. Driven.

The front half of the main shaft 16 (the left half in FIG. 2) stores a shirt [~20] extending back and forth, and the rear half stores a key 21.
The shirt 1-22 is attached to the main shaft 16 so as to be non-rotatable but movable in the forward and backward directions (moveable in the front and rear directions), and the shafts 1-20 and 22 are arranged in series in contact with each other. . The front half of each of the shirts 1 to 20 is supported by a block 23 fixed to the main shaft 16 so as to be able to advance and retreat (move in the front and back direction), and a washer 24 is fixed to the rear end. A disc spring 26 is press-fitted between this washer 24 and the block 23, thereby biasing the shaft 20 rearward.

On the other hand, the rear part of the pulley 18 is formed into a cylindrical shape,
A cylinder 30 is supported inside thereof via a bearing 28. Inside this cylinder 30, the screws 1 to 32 for traction are housed so as to be movable forward and backward.
is connected to the rear ends of the shirts 1 to 22 via bearings 34. A hydraulic pressure supply passage 35 is formed in the side wall of the cylinder 30 for supplying hydraulic pressure for the head side hydraulic chamber 33 of the cylinder 30 .

A stepping motor (driving means) 38 and a potentiometer (detecting means) 40 are attached to the rear end of the cylinder 30 via a bracket 36. Both are connected by a universal joint 42, and the amount of rotation of the drive shaft 39 of the stepping motor 38, that is, the amount of drive of the stepping motor 38, is detected by the potentiometer 40.

A master screw 44 attached to the cylinder 30 is key-coupled to the drive shaft 39 of the stepping motor 38, and the master screw 44 is non-rotatable but movable in the axial direction with respect to the three drive shafts. . This master screw 44 is connected to the piston 32 in the cylinder 30.
It is screwed into a screw hole formed immediately behind the stepping motor 38, and rotates together with the drive shaft 39 of the stepping motor 38, and moves forward and backward with respect to the drive shaft 39 along with this rotation.

That is, in this device, the three drive shafts of the stepping motor 38 rotate and the master screw 44 moves forward, so that the master screw 44 moves the shirts 1 to 20.
22 is pushed forward, and conversely, the rotation of the three drive shafts causes the master screw 44 to retreat, so that the biasing force of the disc spring 26 pushes the shirts 1 to 20 and 22 back to the rear.

On the other hand, a cylindrical boring bar 46 as shown in FIG. 3 is fixed to the front end of the main shaft 16. An adjustment rod 48 fixed to the front end of the shaft 20 is inserted into the boring bar 46 so as to be non-rotatable and movable in the axial direction with respect to the boring bar 46, and its front end is closed with a cover 50. It is.

A tapered cam groove 49 that becomes deeper toward the rear is formed in a predetermined portion of the tip of the adjustment rod 48 . On the other hand, a pin 52 extending in the radial direction of the boring bar 46 is provided at a position corresponding to the cam groove 49 on the side wall of the boring bar 46 . This pin 52 is disposed at a position that moves in the rearward direction as the adjustment iron 48 moves forward and backward, and ridges 54 are provided at positions where the pin 52 contacts the tip.

The proximal ends (the right end in FIG. 3) of the car 1 to the rig 54 are fixed to the boring bar 46 by the poles 1 to 55, and the cutting tool 5 is attached to the distal end by a clamp member 56.
8 is removably held.

Furthermore, a slot 59 is formed between the attachment point of this cutter 58 and the fixation point of the pole l-55, and with this slot 59 serving as a fulcrum, the tip of the cartridge 54 is attached to the diameter of the boring bar 46. It is possible to bend outward in the direction.

Therefore, when the stepping motor 38 is driven, for example, the master screw 44 is moved backward, and as a result of this movement, the countersunk 26
As the shafts 20 and 22 move back due to the urging force of
The adjustment rod 48 fixed to the shaft 22 also retreats, and the pin 52 in contact with the adjustment rod 48 is pushed outward in the radial direction and pushes the tips of the car 1 to the ridge 54 from the inside.
The diameter of the blade 58 (blade diameter) due to the deflection of the cartridge 54
will be expanded. That is, the blade diameter changes depending on the amount of drive of the stepping motor 38, in other words, the number of pulses of the pulse signal input to the stepping motor 38.

FIG. 1 shows the main parts of this blade diameter adjusting device. As shown in the figure, this adjustment device includes an adjustment data setter (adjustment data setting means) 60, an adjustment error correction rate setter (error correction rate setting means) 61, a pulse generator (
(actuating means) 62, analog value adjuster (detected drive amount changing means) 63, AD converter 64, current value memory 65, comparator (drive stopping means) 66, and (above) stepping motor 38 and potentiometer 40. It is equipped with

The adjustment data setter 60 stores data related to the blade position (such as blade diameter) inputted via a circuit keyboard or the like, and outputs a signal to the pulse generator 62 when this data is set to generate this pulse. While operating the generator 62, information regarding the target position adjustment amount is input to the comparator 66.

In this embodiment, the amount of displacement of the blade 58 from a predetermined home position is used as the position adjustment amount, and this amount is manually set in the form of the number of pulses of a pulse signal.

The error correction rate setter 61 stores an error correction rate entered manually using a keyboard or the like, and inputs the information to the analog value adder/subtractor 63. Here, the error correction rate means the rate of deviation between the amount by which the blade should originally be displaced when a pulse signal of a predetermined number of pulses is output to the stepping motor 38 and the amount by which the blade is actually displaced.

For example, the device is designed so that when a pulse signal of 100 pulses is output to the stepping motor 38, the blade diameter changes by 10 μs, but in reality, the diameter of the blade changes by 10 μs.
If the measurement after outputting the pulse signal shows that the blade diameter has changed by only 9 tones, a value of "-10%" will be set as the error correction rate.

The pulse generator 62 starts outputting a pulse signal to the stepping motor 38 by receiving the signal from the adjustment data setting device 60, and operates the stepping motor 38.

The analog value adjuster 63 calculates a value by adjusting the rotation amount detected by the potentiometer 40 and the driving amount of the Zunawara stepping motor 38 based on the error correction rate set by the adjustment error correction rate setting device 61. This is then inputted to the current value storage 65 via the AD converter 64 as the current value. For example, if the actually detected amount of rotation is 100 pulses and the adjustment error correction rate is -10%, then the value obtained by subtracting the amount of rotation by 10%, that is, 90 pulses, will be stored as the current value. .

The target position adjustment amount set by the adjustment data setting device 60 and the detected rotation amount (detected drive m) sequentially stored by the current value storage device 65 are input to the comparator 66 in the form of a pulse number. . Here, the comparator 66 compares both numbers of pulses, and when the two numbers become equal, the pulse generator 6
It is configured to output a pulse generation stop command signal to 2.

Next, the adjustment operation of the blade diameter actually performed by this device will be explained with reference to the flowchart shown in FIG.

First, a pulse signal with a fixed number of pulses is sent to the stepping motor 38, and the actual amount of change in the diameter of the blade 58 due to the driving of the stepping motor 38 is measured. Step S1) Determine the error correction rate by comparing with the reference quantity which is the power quantity.
. Then, the error correction rate setting device 61 adjusts this error correction rate.
(Step S2). This completes the error correction operation before using the device.

Next, start adjusting the blade diameter. First, data regarding the adjusted position of the blade 58 (in this embodiment, the amount of displacement of the blade 58 from the reference position) is input to the adjustment data setter 60 in the form of a pulse number. As a result, the adjustment data setter 6
An operation command signal is output from 0 to the pulse generator 62, and the above data is set as the target position adjustment amount (
Step S3), the signal is input to the comparator 66.

The pulse generator 62 that has received the operation command signal sends a pulse signal to the stepping motor 38 to start driving the stepping motor 38 (step S4). By driving this stepping motor 38, the master screw 44,
The shafts 20, 22 and the adjustment iron 48 move forward and backward, and the pin 52, which contacts the inclined surface of the cam groove A9 of the adjustment iron 48, moves while being pushed by the tip of the car 1-ridge 54. As a result, the cutter 58 is cut in advance by the cutter 1.
The boring bar 46 is displaced from its home position in a direction substantially equal to the radial direction of the boring bar 46.

At this time, the stepping motor 380 times @ amount is detected by the potentiometer 40, but the detected amount is not directly input to the comparator 66, but the analog value adjuster 63 calculates the error (adjusted value). This is set as the detected drive amount and is sequentially input to the comparator 66.In other words, in this device, even if the stepping motor 38 is actually driven by 100 pulses, the error correction rate is taken into account, and the driving amount is, for example, 90 pulses. It is assumed that the drive is only performed for the amount of time.By correcting the detected drive amount in this way, control that covers the above-mentioned error correction rate can be achieved.

The blade diameter gradually increases or decreases due to the above drive, but when the number of pulses M indicating the detected drive amount becomes equal to the number of pulses Mo set as the target position adjustment amount (YES in step S5), the stepping The drive of the motor 38 is stopped (step Ss), and the adjustment of the blade diameter is completed. As a result of the above operations, the blade diameter has been adjusted taking into account the error correction rate, and in this state, boring can be performed by driving the main shaft 16 and boring bar 46. Step 87).

After processing, hydraulic pressure is supplied from the hydraulic pressure supply passage 35 to the head side hydraulic chamber 33 to move the piston 32 forward, and the shirts 1 to 2 are
The boring bar 46 may be pulled out from the workpiece by pushing out the 0.22 mm and adjusting rod 48 and retracting the cutter 58.

As described above, this device automatically adjusts the blade diameter by taking into account the adjustment error correction rate that has been set. The blade diameter can be adjusted automatically and accurately with a simple setting.

Next, a second embodiment will be described with reference to FIG.

In this embodiment, the target position adjustment amount is corrected in advance by taking into account the error correction rate, and by comparing this amount with the amount actually detected by the potentiometer 40, the drive stop control of the stepping motor 38 is performed. There is.

As a specific means, here, instead of the analog value adder/subtractor 63 in the above embodiment, an adjustment pig correction calculator (
Target position adjustment amount changing means) 67 is provided. The adjustment data correction calculator 67 outputs an operation command signal to the pulse generator 62 when the position adjustment amount is set by the adjustment data setting device 60, starts driving the stepping motor 38, and also starts driving the stepping motor 38. is calculated based on the adjustment error rate set by the adjustment error correction rate setter 61, and this is used as the target position adjustment amount, and an information signal regarding this is input to the comparator 66.

For example, if the position adjustment amount set by the adjustment data setter 60 is 100 pulses, and the error correction rate set by the adjustment error correction rate setter 61 is -10%, then this 1
A value such that 0% becomes 100 pulses, that is, 111 pulses, is set as the target position adjustment amount and input to the comparator 66. The comparator 66 compares this target position adjustment amount with the amount of rotation actually detected by the potentiometer 40, and stops the operation of the pulse generator 62 when the two become equal.

As shown in this embodiment, even if the target position adjustment amount is corrected in advance based on the error correction rate and the driving of the stepping motor 38 is stopped by comparing this with the detected rotation amount, the above-mentioned As in the embodiment, it is possible to accurately adjust the blade diameter by taking into account the error correction rate.

Furthermore, as shown in FIG. 5, if a current value display device 68 for displaying the current value stored in the current value storage device 65 is provided,
It becomes possible for the user to grasp the current adjustment status of the blade diameter.

Note that the present invention is not limited to the above-described embodiments, and may take the following embodiments as examples.

(1) In each of the above embodiments, the drive control of the stepping motor 38 is performed by using the amount of rotation detected by the potentiometer 40. However, instead of using such a detection means, The number of pulses of the output signal may be counted up by a counter or the like, and the number of pulses to be outputted may be compared with the target number of pulses using the J-height drive control. However, according to the device using the potentiometer 40 described above, by executing feedback control based on the actual driving amount of the stepping motor 38, more accurate adjustment can be achieved that also takes into account mechanical errors of the stepping motor 38. There is an advantage that it can be done.

(2) In the above embodiment, the difference between the amount by which the blade diameter should change and the actual amount of change is divided by the amount by which the blade diameter should change is input as the error correction rate. In the invention, regardless of the expression type when inputting this error correction rate, for example, the ratio between the actual amount of change in the blade diameter and the amount of change in the blade diameter may be input as the error correction rate. good.

In this case, in the first embodiment, when a pulse signal of 100 pulses is sent to the stepping motor 38, the displacement of the blade 58 is 10 yanagi, and the actual displacement of the blade 58 is 9 yanagi. The above error correction rate is 90%, but by multiplying the actually detected rotation amount by 90% and setting it as the detected drive amount, accurate adjustment of the blade diameter can be performed in the same manner as above. I can do it.

(3) In the present invention, the specific structure of the detection means and the driving means does not matter. As the detection means, in addition to the potentiometer described above, a rotary encoder, other types of sensors, etc. can be applied, and as the driving means, in addition to the above-mentioned stepping motor, an ultrasonic motor, other types of motors, etc. can be applied.

〔Effect of the invention〕

As described above, the present invention includes an error correction rate setting means for setting an error correction rate of the actual movement amount of the cutter relative to the drive of the drive means, and control by the control means based on the set error correction rate. Since the device is equipped with a correction means for correcting the amount of drive of the drive means, this can be done with a simple operation of setting the error correction rate without using a relatively expensive means such as a transmission. This has the effect of being able to accurately adjust the blade diameter while taking into account the error correction rate.

Furthermore, in the apparatus according to claim 2.3, the detection means detects the actual driving amount by the driving means, and the blade diameter is adjusted by performing feedback control based on the detected driving amount. This has the effect of making it possible to make more accurate adjustments even when mechanical errors and the like are taken into consideration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a blade diameter adjusting device of a boring machine according to a first embodiment of the present invention, FIG. 2 is a partially sectional side view showing the overall width configuration of the boring machine, and FIG. 4 is a partial cross-sectional side view showing the blade diameter adjusting device of the same boring machine, FIG. 4 is a flowchart showing the blade diameter adjustment operation actually performed by the blade diameter adjusting device, and FIG. FIG. 6 is a block diagram illustrating the configuration of a blade diameter adjusting device for a boring machine. FIG. 6 is a cross-sectional side view showing an example of a blade diameter adjusting device in a conventional boring machine. 16...Main shaft, 20.22...Shaft (with drive conversion mechanism), 38...Stepping motor (drive means), 40...Potentiometer (detection means), 44
... Master screw (configuring the drive conversion mechanism), 46...
- Boring bar, 48...adjustment rod (configuring the drive conversion mechanism), 52...configuring the pin drive conversion mechanism),
58...Cutter, 60...Adjustment data setter (adjustment data setting means), 61...Adjustment error correction rate setting device (error correction rate setting means), 62...Pulse generator (operating means) , 63...Analog value adjuster (detection change means)
, 66... Comparator (drive stop means), 67... Adjustment data correction calculator (target position adjustment amount changing means).

Claims (1)

[Scope of Claims] 1. A cutter mounted movably in the radial direction of a boring bar, a drive means for generating a driving force for moving the cutter, and a drive means for receiving the drive force of the drive means to produce the cutter. A boring machine comprising: a drive conversion mechanism for moving the blade; adjustment data setting means for setting data regarding the adjustment position of the cutter; and control means for controlling the drive of the drive means based on the set adjustment data. The blade diameter adjusting device in the processing device includes an error correction rate setting means for setting an error correction rate of the actual movement amount of the blade relative to the drive amount of the drive means, and the control based on the set error correction rate. 1. A blade diameter adjusting device for a boring machine, comprising: a correction means for correcting the drive amount of a drive means controlled by the means. 2. The control means includes an actuation means for operating the drive means, a detection means for detecting the drive amount of the drive means, and the detected drive amount is equal to an amount corresponding to a preset target position adjustment amount of the cutter. drive stop means for stopping the driving of the drive means at a certain point in time, and as the correction means, the drive amount actually detected by the detection means is converted based on an error correction rate as the detected drive amount. 2. The blade diameter adjusting device for a boring machine according to claim 1, further comprising means for changing a detection amount to be set. 3. The control means includes an actuation means for operating the drive means, a detection means for detecting the drive amount of the drive means, and the detected drive amount is equal to an amount corresponding to a preset target position adjustment amount of the cutter. drive stop means for stopping the drive of the drive means at the point in time, and the correction means converts the position adjustment amount set by the adjustment data setting means based on the error correction rate to adjust the target position. 2. The blade diameter adjusting device for a boring machine according to claim 1, further comprising means for changing a target position adjustment amount.