JP2683365B2 - Whetstone dressing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grindstone dressing device for shaping a grindstone for grinding (hereinafter referred to as a grindstone) used in a grinder or the like.

[Conventional technology]

In order to improve processing accuracy and processing efficiency, the grindstone must be dressed as needed during processing. A conventional technique will be described below with reference to the drawings by taking a diamond dresser, which is often used for dressing a grindstone of a grinder, as an example.

As shown in FIG. 4, the diamond dresser 1 is made by fixing a single diamond 2 to a metal shank 3. When dressing, the diamond dresser 1 is cut into the grindstone by a predetermined amount. , The outer periphery of the grindstone is scraped off. That is, the dressing reduces the radius of the grindstone by a distance corresponding to the depth of cut. On the other hand, the wear amount of the diamond dresser 1 is small. Therefore, in an automated grinder such as an NC grinder, the cutting direction position of the grindstone is corrected by a distance corresponding to the depth of cut each time dressing is performed to maintain machining accuracy.

[Problems to be solved by the invention]

However, even if the wear amount of the diamond dresser 1 for each dressing is small, the wear amount cannot be ignored as shown in FIG. 4 when the dressing frequency and amount increase. That is, when the diamond dresser 1 is worn, the amount by which the grindstone is actually scraped off with respect to the predetermined cutting amount is reduced by the wear of the diamond dresser 1, and as a result, the apparent outer diameter of the grindstone is increased. That is, the finished size of the workpiece to be ground becomes thinner than the set value. Therefore, when it is necessary to improve the processing accuracy, the operator actually measures the dimensions of the diamond dresser 1 after performing dressing a predetermined number of times.
Since the position data of the grindstone or the depth of cut must be corrected, there is a problem that the work efficiency is poor.

An object of the present invention is to solve the above-mentioned problems and improve both processing accuracy and work efficiency.

[Means for solving the problem]

The above-mentioned problem is that the dresser, the detection device, the first moving device that relatively linearly moves the dresser and the detection device in the approaching direction at the measurement position where the dresser and the detection device face each other, and the dresser and the detection device. Alternatively, in a grindstone dressing device that includes a second moving device that relatively rotationally moves to a non-measurement position, and the detecting device detects the tip position of the dresser, the first moving device is piezoelectric ceramics, and piezoelectric ceramics is used. A voltage applying device for applying a voltage to the device, and means for storing beforehand the relationship between the magnitude of the applied voltage and the amount of expansion of the piezoelectric ceramics at that time,
By linearly moving the detecting device by the piezoelectric ceramics in the direction of contacting and separating, and detecting the wear amount of the dresser from the applied voltage when the detecting device detects the tip of the dresser and the applied voltage before dressing. Will be resolved.

[Action]

At the measurement position, the detector is moved linearly with respect to the dresser, and the dresser is fixed, so the position of the dresser does not change during dressing.

〔Example〕

FIG. 1 is a front sectional view showing a first embodiment of the present invention, and FIG. 2 is a side view.

A holder 4 holds the diamond dresser 1 with a set screw 5. Reference numeral 6 denotes an annular pressure transmission ceramic, which expands and contracts in the thickness direction in proportion to the magnitude of the applied voltage. A voltage application device 7 is connected to the touch sensor 13 and a control device (not shown), and applies a voltage to the piezoelectric ceramic 6 according to a signal from the touch sensor 13 and a command from the control device (not shown). 8 is the base. 9 is a bolt, and piezoelectric ceramics 6
Through and is screwed into the holder 4. The bolt 9 is biased downward by a disc spring 10 so that there is no gap between the piezoelectric ceramic 6 and the holder 4 or the base 8.
It is one.

11 is a lever, which is a shaft 12 rotatably supported by a bearing box 18.
The touch sensor 13 is mounted on the top. 14
Is a detection unit of the touch sensor 13. 15 is a grinder table. 19
Is a gear fixed to the shaft 12. Reference numeral 20 denotes a gear that engages with the gear 19, and is fixed to the output shaft of a motor 21 mounted on the bearing box 18. 22 is a dog placed on the side of the lever 11. 23 and 24 are limit switches mounted on the base 8 for confirming the position of the lever 11. That is, the limit switch 23 is closed when the lever 11 is upright, and the limit switch 24 is closed when the lever 11 is horizontal. Hereinafter, the operation will be described with reference to the case where the grindstone dressing device of the present invention is applied to an NC grinder.

Before starting the grinding work, make the following preparations in advance. That is, first, the diamond dresser 1 is positioned at a position where the tip of the diamond 2 is at the distance 1 from the table 15 in a state where no voltage is applied to the piezoelectric ceramics 6. Next, the lever 11 is set upright, and the touch sensor 13 is positioned at a position where the detection unit 14 contacts the tip of the diamond 2 and the touch sensor 13 closes. When the above work is completed, the lever 11 is moved to the horizontal position (hereinafter referred to as the retracted position) as shown in FIG.

When the predetermined grinding work is completed, the diamond dresser 1 dresses a grindstone (not shown). When dressing is completed, the motor
21 is rotated to erect the lever 11 in the retracted position.

The voltage applying device 7 confirms that the lever 11 is upright by the closing signal of the limit switch 23, and confirms the opening / closing of the touch sensor 13. When the touch sensor 13 is not closed, that is, when the tip of the diamond 2 is worn, the voltage applying device 7 applies a gradually increasing voltage to the piezoelectric ceramic 6. Then, the piezoelectric ceramics 6
Expands in proportion to the applied voltage and pushes the holder 4, that is, the tip of the diamond 2 upward while compressing the disc spring 10. When the tip of the diamond 2 comes into contact with the detection unit 14 and the touch sensor 13 is closed, the voltage application device 7 fixes the voltage applied to the piezoelectric ceramics 6 to the value when the touch sensor 13 was closed. That is, the tip of the diamond 2 is reset at the position of the distance 1 from the table 15. Subsequently, the lever 11 is returned to the retracted position, the closing signal of the limit switch 24 confirms that the lever 11 is in the retracted position, and the grinding process is restarted.

In the same manner, the tip of the diamond 2 during dressing is held at a distance l from the table 15.

FIG. 3 is a front sectional view showing a second embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals.

A lower holder 30 is integrated with the holder 4 and the piezoelectric ceramic 6 by bolts 9. Also, the lower holder 30
Is fixed to the shaft 12 and is rotatable about the shaft 12 between a retracted position shown by a solid line and a dressing position shown by a chain double-dashed line. Reference numeral 31 denotes a plate on which the shaft 12 and a rotating means (not shown) for the shaft 12 are mounted. A switch holder 32 holds the touch sensor 13.

In this embodiment, the tattoo sensor 13 is fixed and the diamond dresser 1 is rotatable. The operation is substantially the same as that of the first embodiment, and therefore its explanation is omitted.

In the above two embodiments, the touch sensor 13 or the diamond dresser 1 was rotated while the voltage was still being applied to the piezoelectric ceramics 6. However, the configuration is such that the applied voltage when both touch each other can be stored. Every
When rotating, the applied voltage is lowered immediately so as to form a gap between the two, and before the dressing (in the second embodiment, the diamond dresser 1 is positioned at the dressing position shown by the chain double-dashed line in FIG. 3). After that, the voltage may be returned to the applied voltage when the both contact again.

Furthermore, if the relationship between the magnitude of the voltage applied to the piezoelectric ceramics and the amount of expansion of the piezoelectric ceramics at that time is obtained in advance, the diamond dresser should be fixed and the touch sensor should be moved by the piezoelectric ceramics. It goes without saying that the amount may be obtained from the difference in the applied voltage and the NC device may be fed back and dressed.

〔The invention's effect〕

As described in detail above, according to the present invention, the tip position of the diamond 2 with respect to the table 15 can always be accurately positioned. Therefore, even if the tip of the diamond 2 is worn, the outer diameter of the grindstone after dressing can be accurately grasped, and the working accuracy and work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention. Second
The figure is a side view. FIG. 3 is a front sectional view showing a second embodiment of the present invention. FIG. 4 is a diagram showing an example of wear of the diamond dresser. 1 ... Diamond dresser, 2 ... Diamond, 4
...... Holder, 6 ...... Piezoelectric ceramics, 7 ...... Voltage application device, 8 ...... Base, 9 ...... Bolt, 10 ...... Disc spring, 11
...... Lever, 12 …… axis, 13 …… tatch sensor, 18 …… bearing box, 19,20 …… gear, 21 …… motor, 30 …… lower holder, 31 …… plate, 32 …… switch holder.

Claims (1)

(57) [Claims] 1. A dresser, a detection device, and a first moving device that relatively linearly moves the dresser and the detection device in a direction in which they approach each other at a measurement position where they face each other.
A grindstone dressing device comprising: a second moving device that relatively rotationally moves the dresser and the detection device to the measurement position or the non-measurement position, and detects the tip position of the dresser by the detection device. Providing a piezoelectric ceramic as the first moving device, a voltage applying device for applying a voltage to the piezoelectric ceramic, and means for previously storing the relationship between the magnitude of the applied voltage and the amount of expansion of the piezoelectric ceramic at that time. The piezoelectric ceramics is configured to linearly move the detection device in an approaching direction, and the wear amount of the dresser is detected from the applied voltage when the detection device detects the tip of the dresser and the applied voltage before dressing. A grindstone dressing device characterized in that