JP2595237Y2 - Polishing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to the structure of a polishing apparatus.
The present invention relates to appropriate control of a polishing section moving motor.

[0002]

2. Description of the Related Art FIG.
In the blade polishing apparatus 50, a predetermined amount of polishing is performed on the blade to be polished by polishing several times at a predetermined cutting amount.

A sliding table 12 is provided on a frame 11. On the sliding table 12, a tool mount 14 on which a tool 13 is installed is installed. A rack gear 25 is fixed to the sliding table 12, and the motor M
The pinion gear 22 attached to the rotation shaft 31 is indicated by an arrow γ.
When rotated in one direction, an arrow α moves on a rail (not shown).
It slides in one direction.

[0004] A center detecting switch 23 and a center detecting bar 24 are provided below the sliding table 12. The center detection bar 24 comes into contact with the center detection switch 23 when the sliding table 12 passes through the center position of the frame 11, and turns on the contact. When the contact is turned on, the control means 51 starts counting. When the count value reaches a predetermined value, the control means 51 rotates the motor M31 in the direction opposite to the arrow γ1 direction, and slides the sliding table 12 in the arrow α2 direction. Thereby, the sliding table 12 slides to a position moved by a predetermined distance from the center position.

On the upper part of the frame 11, a finishing whetstone 17a is provided.
And a polishing unit 15b to which a rough whetstone 17b is mounted. The polishing 15a and 15b are respectively performed by a grinding wheel drive motor M11,
Built-in M21, finishing whetstone 17a, rough whetstone 17b
To rotate.

The polishing section 15a has a nut 20a, and the nut 20a has a rotating shaft 19 of a lifting motor M12.
a is screwed. Therefore, the lifting motor M12
Is rotated in the forward and reverse directions, the polishing section 15a moves up and down. The polishing section 15b has the same configuration.

The polishing of the blade 13 using the rough grinding stone 17b will be described. The polishing unit 15b is lowered in the direction of the arrow β1, and the rough grinding stone 17b is positioned. After the positioning of the polishing unit 15b is determined, the rough whetstone 17b is rotated,
The slide table 12 is slid in the directions of the arrows α1 and α2, and polishing of the blade 13 is started.

As the polishing of the blade 13 proceeds, a gap is generated between the blade 13 and the rough grindstone 17b, and the polishing operation does not proceed any further. Therefore, the operator turns on a notch switch (not shown). As a result, the control means 51 controls the polishing section 15 by the predetermined cutting amount.
b is lowered in the direction of arrow β1. The control of the cut amount is performed as follows.

The control means 51 sends the movement start signal to the elevating motor M22, and after a predetermined time elapses,
A movement stop signal is output to 22. This predetermined time is given from the timer 53.

In this manner, the descent of the predetermined cutting amount is completed, and the polishing of the blade 13 proceeds. These operations are repeated to finish the polishing operation. As described above, in the blade polishing apparatus 50, a predetermined rough cutting operation is automatically repeated to perform a desired rough polishing operation. Thereafter, polishing is similarly performed on the finishing whetstone 17a, and the polishing operation is completed.

[0011]

However, in the blade polishing apparatus 50, there is a problem that the cutting amount varies depending on the frequency of the applied AC power. This is because the amount by which the lift motors M22 and M12 are lowered (cut amount) is determined by the predetermined time. However, even if the elevating motors M22 and M12 are driven for a predetermined time, if the frequency of the applied AC power is different, the driving amount is naturally different.

The fact that the cut amount differs from the preset value in this way imposes a load on the polishing apparatus. For example, when the frequency of the AC power is 50 Hz, and the amount of one cut is set to 0.1 mm, if the frequency of the AC power is 60 Hz, the amount of one cut is:
This is 0.12 mm, which is 1.2 times the set amount. Therefore, the grindstones 17a and 17b or the grindstone drive motor M1
1, an excessive load is applied to M21 and the like.

The present invention solves the above-mentioned problems, and makes it possible to set a single cutting amount to a predetermined value with respect to the amount of descent of the grinding wheel, even if the frequency of the applied AC power is different. The purpose is to provide.

[0014]

According to a first aspect of the present invention, there is provided a polishing apparatus, comprising: a mounting table for mounting an object to be polished; a polishing section for polishing the object to be polished; In contrast, the polishing unit is moved so as to be relatively close to each other, and when a movement stop signal is given, the polishing unit moving motor that stops the movement, a movement count value corresponding to a desired movement amount is transmitted to the polishing unit moving motor. Moving amount storing means for storing a plurality of moving amounts for each frequency of the applied AC power, pulse signal outputting means for outputting a pulse signal corresponding to the frequency of the AC power, and moving based on a pulse signal given from the pulse signal outputting means. Selecting means for selecting any one of the plurality of movement count values stored in the amount storage means, outputting a movement start signal to the polishing section movement motor when a movement start command is given; Receiving a pulse signal from the pulse signal output means, and outputting a movement stop signal to the polishing section movement motor if the pulse signal is equal to the movement count value selected by the selection means and the pulse count value. Means.

[0015]

In the polishing apparatus of the first aspect, the movement amount storage means stores a plurality of movement count values corresponding to a desired movement amount for each frequency of the AC power supplied to the polishing section movement motor. The pulse signal output means outputs a pulse signal corresponding to the frequency of the AC power. Selecting means based on the pulse signal given from the pulse signal output means,
One of a plurality of movement count values stored in the movement amount storage means is selected. The control means outputs a movement start signal to the polishing section movement motor when a movement start command is given. Thus, the polishing section moving motor moves the polishing section relatively to the mounting table.
Thereafter, upon receiving the pulse signal from the pulse signal output means, if the pulse signal is equal to the movement count value selected by the selection means and the count value of the pulse, a movement stop signal is output to the polishing section movement motor. Thus, the polishing section moving motor stops the movement.

Thus, the polishing section moving motor can be driven by a desired amount in accordance with the frequency of the AC power supplied to the polishing section moving motor.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a polishing apparatus 1. The polishing apparatus 1 includes a polishing main unit 29 and a control unit 30.

The polishing section main body 29 will be briefly described. A sliding table 12 is provided on the frame 11. On the slide table 12, there is provided a blade mounting table 14 which is a mounting table. A blade 13 to be polished is placed on the blade mount 14. Sliding table 1
2, a rack gear 25 is fixed, and the motor M3
The pinion gear 22 attached to the first rotation shaft is the arrow γ1
When rotated in the direction, on the rail (not shown), arrow α1
Slide in the direction.

A center detecting switch 23 and a center detecting bar 24 are provided below the sliding table 12. When the sliding table 12 passes through the center position of the frame 11, the center detection bar 24 comes into contact with the center detection switch 23. This allows the center detection switch 23
Turns on.

On the upper part of the frame 11, a finishing whetstone 17a
And a polishing unit 15b to which a rough whetstone 17b is mounted. The polishing 15a and 15b are respectively performed by a grinding wheel drive motor M11,
Built-in M21, finishing whetstone 17a, rough whetstone 17b
To rotate.

The polishing section 15a has a nut 20a, and a rotary shaft 19a of a lifting motor M12, which is a polishing section moving motor, is screwed into the nut 20a. The polishing section 15b has the same configuration.

Next, the control section 30 will be described. The control unit 30 includes a control unit 31, a selection unit 33, a movement amount storage unit 35, and a pulse signal output unit 37.

The moving amount storage means 35 stores a plurality of moving count values corresponding to a desired moving amount for each frequency of the AC power (voltage or current) supplied to the lifting / lowering motors M12 and M22. The pulse signal output means 37 outputs a pulse signal corresponding to the frequency of the AC power. Selection means 3
3 selects one of a plurality of movement count values stored in the movement amount storage means 35 based on the pulse signal given from the pulse signal output means 37. When a movement start command is given, the control means 31 outputs a movement start signal to the lifting / lowering motors M22 and M12, which are polishing part movement motors. Further, upon receiving a pulse signal from the pulse signal output means 37, if the pulse signal becomes equal to the movement count value selected by the selection means 33 and the count value of the pulse, a movement stop signal is sent to the lift motors M22 and M12. Output. In this manner, the lift motors M12, M2 are increased by an amount corresponding to the frequency of the AC power supplied to the lift motors M12, M22.
2 can be driven. Thereby, even if the frequency of the applied AC power is different, the amount of one cut for the amount of descent of the grindstone can be set to a predetermined value.

FIG. 2 shows a hardware configuration in which the control unit 30 is realized using a CPU. The bus line 42 has a CP
U41, ROM43, and RAM45 are connected.
PU41 controls each part according to the program stored in ROM43. The CPU 41 also controls the grinding wheel drive motors M11 and M21, the lift motors M21 and M22 via the input / output interface 47 and the driver 48.
The rotation of the motor M31 for rotating the pinion gear 22 is also controlled.

A detection signal detected by the center detection switch 23 is sent to the CPU via an input / output interface 47.
41.

The external interrupt terminal INT of the CPU 41
The frequency detection circuit 49 is connected. The frequency detection circuit 49 includes a transformer 46 as a transformer, a rectifier 26 as a rectifier, and a zero-cross detector 44. In the present embodiment, the zero-crossing detecting means 44 includes a resistor R
1 to R3 and the transistor Tr1.

A plurality of movement count values are stored in the RAM 45. In this embodiment, the movement count values REF1 and REF for 50 Hz as the AC power frequency are
Two kinds of movement measurement values of the movement measurement value REF2 for 0 Hz were stored.

Next, a specific polishing operation in the blade polishing apparatus 1 will be described. The cutting tool 13 is placed and fixed on the cutting tool mounting table 14, and is first polished with a rough grindstone 17b.

The CPU 41 gives a command to the driver 48 to drive the lift motor M22 to perform positioning at a predetermined height. After that, the CPU 41 rotationally drives the grindstone drive motor M21 via the driver 48 and also rotationally drives the motor M31 in the direction of the arrow γ1. As a result, the sliding table 12 slides in the direction of the arrow α1, and
7b rotates, and the polishing operation starts.

When the sliding table 12 passes through the center position of the frame 11, the center detecting bar 24 comes into contact with the center detecting switch 23. As a result, the center detection switch 23 is turned on. When the contact is turned on, the control means 3
1 starts counting. When the count value reaches a predetermined value, the control means 31 moves the motor M31 to the arrow γ1.
The sliding table 12 is rotated in the opposite direction to slide the sliding table 12 that has slid in the direction of the arrow α1 in the direction of the opposite arrow α2. Thereby, the sliding table 12 slides to a position moved by a predetermined distance from the center position. The polishing operation proceeds by repeating this reciprocating motion.

During this reciprocating motion, when the operator turns on the notch switch (not shown), the CPU 41
Captures such a signal and drives the elevating motor M22 as follows.

The control operation of the CPU 41 will be described with reference to FIG. When the sliding table 12 moves to the right (step ST1), it is determined whether or not the center position has been detected (step ST2). When the center position is detected, the CPU 41 outputs a movement start signal to the lift motor M22 via the driver 48. Thereby, the rough whetstone 17b starts descending (step ST3).

Next, the CPU 41 operates as follows.
It is determined whether the frequency of the applied AC power is 50 Hz or 60 Hz (step ST4).

When the power is turned on, the frequency detection circuit 49
Converts a pulse signal into a CP signal in accordance with the frequency of the AC power supplied to the lift motors M12 and M22 as follows.
Output to U41.

The applied AC power (see FIG. 3A) is transformed by a transformer 46 and rectified by a rectifier 26. That is, the waveform is as shown in FIG. 3B (point B). This rectified waveform is given to the zero-cross detecting means 44. As a result, the resistors R1 and R2 are connected to the base of the transistor Tr1.
Is applied. Transistor Tr
When the voltage applied to the base of the transistor 1 exceeds the threshold value of the transistor Tr1, the transistor Tr1 is turned on, and the potential at the point C on the collector side of the transistor Tr1 becomes LOW level.

On the other hand, when the voltage applied to the base of the transistor Tr1 does not exceed the threshold value of the transistor Tr1, the transistor Tr1 is turned off, and the potential at the point C on the collector side of the transistor Tr1 becomes HIGH. Level. Thus, the zero-cross point of the frequency of the applied AC power is detected, and a corresponding pulse signal can be output. That is, the peak at the point C becomes a pulse as shown in FIG. 3C. CPU
41 counts the number of pulse signals in one second, and the frequency of the applied AC power is 50 Hz or 60 Hz.
Is determined.

Based on the result of this determination, the CPU 41
A corresponding movement count value is read from the two types of movement count values stored in the AM 45. For example, if the frequency of the applied AC power is 50 Hz, the process proceeds to step ST5, where the corresponding movement count value REF1 is read and set as the cut count value MAX.

When a pulse signal is given from the frequency detection circuit 49, the processing of the interrupt routine program shown in FIG. 4 is performed, and 1 is subtracted from the cut count value MAX (step ST11). The CPU 41 sets the cut count value MA until the cut count value MAX = 0.
Continue to determine whether X = 0 (step ST in FIG. 4)
6). When the cut count value MAX = 0, the CPU
41 outputs a movement stop signal to the lifting / lowering motor M22 via the driver 48. Thereby, the lowering of the rough whetstone 17b is stopped (step ST7).

In step ST4, if the frequency of the applied AC power is 60 Hz, the process proceeds to step ST8, in which the corresponding movement count value REF2 is read out, set as the cut count value MAX, and similarly, the lift motor M22 is controlled. I do.

After the polishing with the rough grindstone 17b, the polishing with the finishing grindstone 17a is performed. However, the processing at this time is exactly the same as the above case, and the description is omitted.

As described above, in this device,
Compared to the conventional example, just by adding a simple circuit configuration,
The timer 53 becomes unnecessary, and appropriate control according to the supplied AC power can be performed.

[Other Application Examples] Although the present embodiment has been described using the blade polishing apparatus, the present invention can also be used as a polishing apparatus, for example, a polishing apparatus for plate-like objects.

In the present embodiment, the frequency of the AC power is detected by detecting the zero-cross point of the AC power. However, as long as a pulse signal corresponding to the frequency of the AC power can be output. Such a configuration may be adopted. For example, a peak point of AC power may be detected.

In this case, as a circuit, for example, in the circuit shown in FIG.
Another transistor may be inserted between the INT terminal of the PU 41 and the INT terminal to be HIGH when the voltage is near the peak.

In this embodiment, the polishing section 15
a, 15b was lowered to position the grindstone,
A motor that raises the blade mount 14 may be provided to raise the blade mount 14.

In this embodiment, when a gap is generated between the blade 13 and the rough grindstone 17b, and the polishing operation does not proceed any more, the operator turns on the cutting switch to turn on the cutting switch. CPU 41 is a lifting motor M
22 was driven and controlled. However, without being limited to this, when the center position detection switch 23 is turned on a predetermined number of times, the polishing section 15b may be lowered in the direction of the arrow β1 by a predetermined cutting amount.

In the present embodiment, the functions shown in FIG. 1 are realized by using the CPU 23 and software. However, some or all of them may be realized by hardware such as a logic circuit.

[0048]

According to the first aspect of the present invention, the pulse signal output means outputs a pulse signal corresponding to the frequency of the AC power. The selection means selects one of the plurality of movement count values stored in the movement amount storage means based on the pulse signal provided from the pulse signal output means. The control means outputs a movement start signal to the polishing section movement motor when a movement start command is given. This allows
The polishing section moving motor moves the polishing section relatively to the mounting table. Thereafter, upon receiving the pulse signal from the pulse signal output means, if the pulse signal is equal to the movement count value selected by the selection means and the count value of the pulse, a movement stop signal is output to the polishing section movement motor. Thus, the polishing section moving motor stops the movement.

As described above, the polishing section moving motor can be driven by a desired amount in accordance with the frequency of the AC power supplied to the polishing section moving motor. Therefore, it is possible to provide a polishing apparatus that can set a single cut amount to a predetermined value even if the frequency of the applied AC power is different with respect to the drop amount of the grindstone.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a polishing apparatus 1 according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a hardware configuration in which a cutting amount determination unit 30 of FIG. 1 is implemented by a CPU.

FIG. 3 is a diagram showing a waveform change of an AC power supply.

FIG. 4 is a flowchart showing control of a CPU 41;

FIG. 5 is a configuration diagram of a conventional polishing apparatus 50.

[Explanation of symbols]

 12 Tool cutting table 15a, 15b Polishing unit 17a Finishing wheel 17b Rough wheel M11, M21 Lifting motor 31 · Control means 33 ······ Selection means 35 ····· Moving amount storage means 37 ····· Pulse signal output means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B24B 47/20 B23Q 15/00 B24B 49/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A mounting table on which an object to be polished is mounted, a polishing section for polishing the object to be polished, and when a movement start signal is given, the polishing section is moved so as to approach the mounting table relatively. A polishing unit moving motor for stopping the movement when a movement stop signal is given, a moving amount for storing a plurality of movement count values corresponding to a desired moving amount for each frequency of the AC power supplied to the polishing unit moving motor. Storage means, a pulse signal output means for outputting a pulse signal corresponding to the frequency of the AC power, a plurality of movement count values stored in the movement amount storage means based on the pulse signal given from the pulse signal output means. Selecting means for selecting any one of them, when a movement start command is given, outputs a movement start signal to the polishing section movement motor and receives a pulse signal from the pulse signal output means. Control means for outputting a movement stop signal to the polishing section moving motor if the pulse signal is equal to the movement count value selected by the selection means and the pulse count value. apparatus.