JPS5914462A - Grindstone abrasion correcting device - Google Patents

Abstract

PURPOSE:To perform grinding work accurately in short time in an automatic grinder, by detecting abrasion of a grindstone automatically by means of a detector then moving the grinding tool in accordance to the detection signal passed through a potentiometer and performing correction. CONSTITUTION:A rotary member 36 in a detector 34 will rotate while contacting with the grinding face 38 of a grindstone 3 to rotate a coupling board 35 together with an angular axis 30 in accordance to the amount of abrasion thus to produce an electric signal corresponding to the amount of abrasion from a potentiometer 33. Upon rotation of D.C. motor 22 through said signal, a rotary shaft 17 will rotate through bevel gears 23, 15 thus to lower a grinding tool 9 fixed to a tubular table 14 to be screwed with said shaft 17 along a groove 25 in the fixed rail 24 and to lower the grindstone grinding face 38 at the shaft end in accordance to the amount of abrasion. Consequently grinding work can be performed without correcting the grinding machine in short time with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a grindstone wear correction device for grinding a workpiece surface along a target grinding line ν while correcting a decrease in grinding depth due to grindstone wear.

[Technical background of the invention]

Using automatic grinding equipment built into grinding machines, robots, etc.
When grinding the surface of a workpiece, conventionally, a target grinding line 2 is set based on the dimensions and shape of the workpiece 1, as shown in FIG.
The grinding machine, robot, etc. are moved so as to obtain the center movement line 4.

[Problems with background technology]

When moving the grindstone along the movement line 4 parallel to the grinding line 2 as described above, if the grindstone 3 does not wear out,
The grindstone moves parallel to the target grinding line 2, and the shaded area 5, which is the area to be ground, is all supposed to be ground at a constant grinding depth. However, in reality, as the workpiece is being ground, the grinding wheel 3 also wears out, so the grinding depth decreases by the amount of wear 6 on the grinding wheel 3, as shown in FIG. state.

Therefore, if grinding is performed without considering the amount of wear 6 of the grindstone 3, the work will be completed without grinding to the planned target grinding line, resulting in the production of products with defective dimensions.

In order to correct this, the grindstone 3 was moved over the same movement line 4 several times.
Don't replace it! ! It is conceivable to grind ζ, but this method shortens the cycle for replacing the grindstone, making it impossible to use the grindstone effectively, and has the disadvantage of increasing machining time due to repeated operations. It is also conceivable to predict the amount of wear 6 of the grindstone through experience and move the grinding machine, robot, etc. so that the movement line 4 approaches the target grinding line 2 as the grinding work progresses, as shown in FIG. However, this method requires experiments to predict the amount of wear depending on the material of the workpiece, the type of grindstone, etc., and there are problems such as the need for correction work due to the discrepancy between the prediction and reality.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to automatically and accurately compensate for the reduction in grinding depth due to grinding wheel wear, and to always keep the grinding line on the target grinding line. To provide a simple and easy-to-use grindstone wear correction device that can perform grinding, shorten processing time, effectively utilize the grindstone, reduce correction work, etc.

[Summary of the invention]

In order to achieve the above object, the present invention allows a grinding machine or a robot to hold a grinding tool that rotatably supports a disc-shaped grindstone at one end via a holding part, and the grinding tool has a wear amount of the upper Bj3 grindstone. and a converter that converts the amount detected by the detector into a detection signal, and the movement mechanism is actuated by the detection signal from the converter,
The gist is that the distance between the grinding tool and the grinding tool holder is changed by an amount corresponding to the amount of wear on the grindstone.

[Embodiments of the invention]

An example of the implementation of the present invention will be described in detail below with reference to FIGS. 4 to 7.

FIG. 4 is a side view of the grinding wheel wear correction device according to the present invention, and FIG.
FIG. 7 and FIG. 7 are front views showing the main parts of the wear correction device in a broken state.

In the figure, reference numeral 8 denotes a grinding tool holding stand provided at the tip of an automatic grinding device such as a grinding machine or a robot, and a grinding tool 9 is held on this holding stand 8 via a moving mechanism 10.

This mechanism 10 has the following configuration.

That is, a cylindrical support member 11 is attached to the end face of the holding base 8, and a cylindrical base 14 having a female screw portion 12 carved in the upper part and a movement space 13 at the lower part is attached to the outer surface of the grinding tool 9, and a cylindrical support member 11 is attached to the center part. A bevel gear 15 is formed, and a male threaded portion 1 is provided at the bottom.
The upper end of the rotating shaft 17 formed with a diameter 6 is rotatably inserted into the hole of the cylindrical support member 11 via the bearing 18, and the 1T wood screw 16 of the rotating shaft 17 is inserted into the female threaded portion 1 of the cylindrical base.
2, and furthermore, there are removal stop plates 19 at the upper and lower ends of the rotating shaft 17.
, 39, the grinding tool 9 is held by the holding table 8.

Then, the support bracket 20 is attached to the end surface of the holding table 8, and the I)C
The motor 22 is fixed, and the bevel gear 23 attached to the shaft of the C motor 22 is meshed with the bevel gear 15 of the rotating shaft 17. Further, a fixed rail 24 is provided on the end surface of the holding table 8, and a protrusion 27 of a movable rail 26 provided upright on the outer surface of the grinding tool 9 is inserted into the groove 25 formed at the lower part of the fixed rail 24. It is inserted as shown in Figure 6.

Further, a support block 28 is fixed to the outer surface of the grinding tool 9, a through hole 29 parallel to the grinding tool 9 is bored in the support block 28, and the angle shaft 30 is inserted into the bearing 31 from one end of the through hole 29. Further, one end of a fill spring 32 is fixed to the center of the angle shaft 30, and the other end is fixed to the support block 28. Further, the rear end of the angle shaft 30 inserted into the through hole 29 is connected to a potentiometer 33 attached to the end face of the support block 28, converting the rotation angle of the angle shaft 30 into a signal, and transmitting this signal via a cable 33a. and transmits it to the DC motor 22,
The DC motor 22 is rotated according to the rotation angle of the angle shaft 30.

Further, a detector 34 for detecting the amount of wear on the grindstone 3 is connected to the tip of the angle shaft 30. This detector 34 is
A shaft 37 with a rotating body 36 inserted between the ends of a connecting plate 35 and 35 fixed to the end of the angle shaft 30 can be accessed.
The rotating body 36 is always in contact with the white 1f surface blade of the grindstone 3 by urging the angle shaft 30 counterclockwise in FIG. 4 by the elastic force of the spring 320.

The operation of the grindstone wear correction device constructed as described above will be described below.

As described above, the rotating body portion that constitutes a part of the detector 34 is always in contact with the grinding surface 38 of the grindstone, and rotates as the grindstone 3 rotates. When the grinding wheel 3 wears out, as shown by the broken line in FIG.
The angular axis 3° also rotates because it is integrated with the connecting plate 35.

Then, the potentiometer 33 connected to the rear end of the angle shaft 30 converts the amount of rotation of the angle shaft into an angle signal, which is transmitted to the DC motor 22 via the cable 33a, and the D
The C motor 22 is rotated according to the angle signal.

Due to the rotation of this DC motor 22, the bevel gears 23, 15
The rotating shaft 17 rotates through the grinding tool 9, and the grinding tool 9 to which the cylindrical stand 14 is attached moves vertically along the groove 25 of the fixed rail 24. Then, the grinding surface blades of the grindstone attached to the shaft end of the grinding tool 9 also move up and down.

Therefore, as shown in FIG. 8, based on the angle signal θ from the detector 34, the following relational expression (1
) to determine the wear amount of the grindstone 3.

t=ro-r r=r'-R r'=(l-lCO3θ)2+ (L-1sinθ)
2, °, t = r o + R-J'77-1cos
θ)2+ (L-Asinθ)2・・・・・・・・・(
1) Here, t: wear amount l of the grinding wheel 3 = pitch L between the angle axis 30 and the rotating body 36: pitch ratio between the angle axis and the center of rotation of the grinding wheel 3: radius ro of the rotating body 36: radius of the grinding wheel 3 Radius before wear r: Radius after wear of the grinding wheel 3 r': Pitch θ between the center of rotation of the grinding wheel 30 and the center of rotation of the rotating body 360: Angle signal of the potentiometer 33 (change in angle axis 300 rotations) And the determined wear The DC motor 22 in the moving mechanism 10 is driven by an amount t to lower the grinding tool 9 and maintain the grinding surface 38 of the grindstone 3 at the target grinding line 2.

Note that the above is only one example of implementing the present invention, and the present invention is not limited to the above. For example, the DC of the moving mechanism 10
A hydraulic drive system may be used instead of the motor 22, and the wear amount detector 34 may be configured with a capacitive sensor, an air gap sensor, or the like.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the amount of wear on the grinding wheel is automatically detected by a detector, this detected amount is converted into a signal by a potentiometer, etc., and the moving mechanism is operated by an amount corresponding to this signal. Since the grinding tool is moved through the grinding wheel, there is no need to repeatedly go around the grinding wheel moving line and grinding, and the amount of wear on the grinding wheel can be predicted and the movement of the grinding machine, robot, etc. can be corrected1. −°without
It offers many advantages, such as being able to grind the surface of a workpiece to a constant grinding depth, producing products with excellent dimensional accuracy in a short time and with simple operations, and making effective use of the grindstone itself. Ru.

[Brief explanation of the drawing]

Figure 1 is a side view showing the principle of grinding using an automatic grinding device.
Fig. 2 is a side view showing a grinding state in which the wear of the grindstone is taken into consideration, Fig. 3 is a side view showing a grinding state in which the movement line is corrected in consideration of wear of the grindstone, and Fig. 4 is a side view of the grinding state according to the present invention. A side view of the wear compensation device, FIG. 5 is a cutaway front view of the main parts of the grindstone wear compensation device, FIG. 6 is a cross-sectional view showing the fitted state of the fixed rail and the movable rail, and FIG. 7 is a FIG. 8 is a cutaway front view of the main part of the grindstone wear correction device, and is a diagram illustrating the principle of detecting the amount of grindstone wear. 3... Grinding wheel, 8... Grinding tool holding part, 9... Grinding tool, 10... Movement mechanism, 17... Rotating shaft, 2
2...Motor, (9)...Angle axis, 33...Converter, 34...Detector. Application Substituted Criminal Kiyoshi Inomata hZ Map No. 3

Claims (1)

[Scope of Claims] 1. A grinding tool that rotatably supports a disk-shaped grindstone at one end, a grinding tool holder fixedly attached to a grinding machine or a robot, etc. to hold the grinding tool, and a grinding tool holder fixed to a grinding machine or a robot, etc. to prevent wear of the grindstone. A detector that detects the amount, a converter that converts the amount detected by the detector into a detection signal, and a moving mechanism that changes the distance between the grinding tool and the grinding tool holder in response to the detection signal. A grindstone wear correction device characterized by: 2. The detector is an angle axis that rotates according to the amount of wear on the grindstone, the converter is a potentiometer that converts the rotation of the angle axis into an angle signal, and the moving mechanism rotates the angle according to the angle signal. a rotating shaft rotated by the motor, one end of which is rotatably supported by the grinding tool holder or one of the grinding tools, and the other end of which is screwed into the other of the grinding tool holder or the grinding tool; and a guide portion that allows the grinding tool to move only in the ill+ direction of the rotating shaft.