JPH0224058A - Dressing device for grindstone - Google Patents

Abstract

PURPOSE:To correctly position the tip position of a diamond for a table always by providing a 1st moving device moving the holder for a diamond dresser or one part of position detecting devices in the axial direction and a 2nd moving device moving a separated holder and position detecting device to relatively opposing positions. CONSTITUTION:A lever 11 located at the horizontal position is erected after pressing a grinding grindstone by the diamond dresser held on a holder 4, and a touch sensor 13 and dresser 1 are aligned. Voltage is impressed on a piezoelectric ceramics (1st moving device) 6 by a voltage impressing device 7. The piezoelectric ceramics 6 is elongated according to voltage, the tip of the diamond 2 is brought into contact with a detection part 14 and the touch sensor 13 is closed. The impressing voltage to the piezoelectric ceramics 6 is fixed based on the close signal of this sensor 13 and the tip of the diamond 2 is set again to the position at the front of the dressing, namely the position of a distance lfrom the face of a table 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grindstone dressing device for shaping a grinding wheel (hereinafter referred to as a grindstone) used in a grinding machine or the like.

[Conventional technology]

In order to improve machining accuracy and machining efficiency, the grindstone must be dressed as necessary during machining.

In the following, a diamond dressing diamond 2, which is often used for dressing a grinding wheel of a grinding machine, is fixed to a metal shank 3. When dressing, the radius of the grindstone is reduced by a distance corresponding to the depth of cut. On the other hand, the amount of wear on the diamond dresser 1 is small. Therefore, in automated grinding machines such as NC grinders, the position of the grinding wheel in the cutting direction is corrected by a distance corresponding to the depth of cut every time dressing is performed to maintain machining accuracy.

[Problem to be solved by the invention]

However, even if the amount of wear on the diamond dresser 1 per dressing is small, as the number and amount of dressing increases, the amount of wear becomes non-negligible as shown in FIG. 4. In other words, when the diamond dresser 1 wears, the actual grinding wheel for a predetermined depth of cut becomes smaller by the amount of wear of the diamond dresser 1, and as a result, the apparent outside diameter of the grindstone becomes larger. As a result, the finished dimension of the workpiece to be ground becomes thinner than the set value. Therefore, when it is necessary to improve machining accuracy, the operator must actually measure the dimensions of the diamond dresser 1 after dressing the diamond dresser 1 a predetermined number of times, and correct the position data or depth of cut of the grinding wheel. The problem was that it was inefficient.

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

[i,! Means for Solving the Problem] Means for solving the above problem will be explained with reference to FIG. 1, which is an embodiment of the present invention.

4 is a holder, and a diamond dresser 1 is attached to the set screw 5.
hold. Reference numeral 6 denotes a ring-shaped piezoelectric ceramic to which a thickness force is applied in proportion to the magnitude of the applied voltage. 8 is the base. 9 is a bolt that connects the holder 4 through the piezoelectric ceramic 6.
are screwed together.

Note that the bolt 9 is urged downward by a disc spring 10, and there is no gap between the piezoelectric ceramic 6, the holder 4, and the base 8, and they are integrated. Reference numeral 11 denotes a lever, which is rotatable around a shaft 12. A touch sensor 13 is placed on the top of the lever 11. Note that when the lever 11 is placed upright, the detection section 14 of the touch sensor 13
is positioned at a distance t from the table 15 of the grinding machine. When the lever 11 is stood upright and the flat retouch sensor 13 and the diamond dresser 1 are aligned, the tip of the diamond 2 and the detection part 14 are in contact and the touch sensor 13 is closed.

[For production]

After dressing, the L/bar 11 which was in a horizontal position is made to stand upright, and the touch sensor 13 and the diamond dresser A are aligned. At this time, if the tip of the diamond 2 is worn out, there will be a gap between the tip of the diamond 2 and the detection part 14, and the touch sensor 13 will not close. Therefore, when the voltage applied to the piezoelectric ceramic 6 is increased by the voltage application device 7, the piezoelectric ceramic 6 expands in accordance with the applied voltage. Then, the tip of the diamond 2 approaches the detection section 14 in accordance with the voltage applied to the piezoelectric ceramic 6, and the tip of the diamond 2 approaches the detection section 14.
When the touch sensor 13 comes into contact with the touch sensor 13, the touch sensor 13 closes. When the voltage applied to the piezoelectric ceramic 6 is fixed using the closed signal of the touch sensor 13, the tip of the diamond 2 is at the position before dressing, that is, at a distance t from the surface of the table 15.
It will be set again to the position of .

〔Example〕

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

4 is a holder, which is attached to the diamond dresser 1 by a set screw 5.
hold. 6 is a ring-shaped piezoelectric ceramic, which expands and contracts in the thickness direction in proportion to the magnitude of the applied voltage. Reference numeral 7 denotes a voltage applying device, which is connected to the touch sensor 13 and a control device (not shown), and applies a voltage to the pressure ceramics 6 in response to a signal from the touch sensor 13 and a command from the control device (not shown).

8 is the base. A bolt 9 penetrates the piezoelectric ceramic 6 and is screwed into the holder 4. Note that the bolt 9 is biased downward by a disc spring 10, and the piezoelectric ceramic 6
There is no gap between the holder 4 and the base 8, and they are integrated.

Reference numeral 11 denotes a lever, which is fixed to a shaft 12 rotatably supported by a bearing box 18, and has a touch sensor 13 mounted on its top. 14 is a detection section of the touch sensor 13; 15 is the table of the grinding machine. 19 is a gear fixed to the shaft 12. 20 is a gear that engages with the gear 19, and the motor 2 mounted on the bearing box 18
It is fixed to the output shaft of 1. 22 is a dog placed on the side of the lever 11. Reference numerals 23 and 24 are reference switches placed on the base 8 for checking the position of the lever 11. That is, the arrangement is such that when the lever 11 stands upright, the limit switch 23 closes, and when the lever 11 becomes horizontal, the limit switch 24 closes. The operation will be described below, taking as an example the case where the grindstone dressing device of the present invention is applied to an NC grinding machine.

Before starting the grinding work, make the following preparations in advance.

That is, first, without applying a voltage to the piezoelectric ceramic 6, the diamond dresser 1 is positioned at a position where the tip of the diamond 2 is a distance t from the table 15. Next, the lever 11 is made to stand upright, and the touch sensor 13 is positioned at a position where the detection part 14 contacts the tip of the diamond 2 and the touch sensor 13 is closed. When the above operations are completed, the lever 11 is placed in a horizontal position (hereinafter referred to as the retracted position) as shown in FIG.

When the specified grinding work is completed, the diamond dresser 1
Then, dress the whetstone (not shown). When the dressing is finished, the control device (not shown) controls the motor 2.
1 to make the lever 11 in the retracted position stand upright.

The voltage application device 7 confirms that the lever 11 is upright based on the close signal of the limit switch 23, and the touch sensor 13
Check opening and closing. If the touch sensor 13 is not closed, that is, if the tip of the diamond 2 is worn out, the voltage application device 7 applies a gradually increasing voltage to the piezoelectric ceramic 6. Then, the piezoelectric ceramic 6 expands in proportion to the applied voltage, and the disc spring 10
While compressing the holder 4, that is, the tip of the diamond 2, is pushed upward. Then, when the tip of the diamond 2 contacts the detection part 14 and the touch sensor 13 closes, the voltage application device 7 fixes the voltage applied to the piezoelectric ceramic 6 to the value when the touch sensor 13 is closed. That is,
This means that the tip of the diamond 2 has been reset to a position a distance t from the table 15. Subsequently, the lever 11 is returned to the retracted position, the closing signal of the limit switch 24 is used to confirm that the lever 11 is in the retracted position, and the grinding process is restarted.

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

FIG. 3 is a front sectional view showing a second embodiment of the invention. Note that the same parts as in FIG. 1 are given the same reference numerals.

30 is a lower holder, which is integrated with the holder 4 and piezoelectric ceramics 6 by bolts 9. In addition, the lower holder 3
0 is fixed to a 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 two-dot chain line. 31 is a plate with shaft 12 and shaft 1
2 rotation means (not shown) are mounted. A switch holder 32 holds the touch sensor 13.

In this embodiment, the touch sensor 13 is fixed and the diamond dresser 1 is rotatable, and the operation is substantially the same as that of the first embodiment, so a description thereof will be omitted.

In addition, in the above two embodiments, the piezoelectric ceramic 6
The touch sensor 13 or the diamond dresser 1 was rotated while a voltage was applied to the contact sensor 13 or the diamond dresser 1 in the same state. The applied voltage is lowered once so that the two can come into contact with each other again before dressing (in the second embodiment, the diamond dresser 1 is positioned at the dressing position shown by the two-dot chain line in FIG. 3). The applied voltage may be returned to the voltage applied at that time.

Furthermore, if the relationship between the size of the edge applied to the piezoelectric ceramics and the amount of elongation of the piezoelectric ceramics at that time is determined in advance, it is possible to keep the diamond dresser fixed and move the touch sensor using the piezoelectric ceramics. Needless to say, the amount may be determined from the difference in applied voltage and the dressing may be performed by turning on the NC device.

4. [Effects of the Invention] 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 out, the outer diameter of the grindstone after dressing can be accurately determined, and there is an effect that machining accuracy and work efficiency can be improved.

[Brief explanation of the drawing]

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 invention. FIG. 4 is a diagram showing an example of wear of a diamond dresser. DESCRIPTION OF SYMBOLS 1... Diamond dresser, 2... Diamond, 4... Holder, 6... Piezoelectric ceramics, 7... Voltage application device, 8... Base,
9...volt, 10...ll1j'ne, 11
... Lever 12 ... Shaft, 13 ... Touch sensor, 18 ... Bearing box, 19.20 ... Gear, 21 ... Motor, 30 ... Lower holder,
31...Plate, Kaya! Figure $2 Figure 2...Switch holder. Home←==-

Claims (1)

[Claims] 1. A dresser, a holder that holds the dresser, a position detection device, a first moving device that moves at least one of the holder or the position detection device in the axial direction, and a separated holder and position. A grindstone dressing device comprising: a second moving device that moves the detection device to a position facing the detection device. 2. The grindstone dressing device according to claim 1, wherein the first moving device that moves at least one of the holder and the position detection device in the axial direction is made of piezoelectric ceramics.