JPH0426205Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dressing position detection device for a grinding machine, and more specifically, the present invention is a dressing position detection device for a grinding machine. This invention relates to a dressing device for a grinding machine.

[Conventional technology]

A grinding wheel in a grinding machine wears out while grinding a workpiece, and the surface becomes rough or the abrasive grains become clogged, resulting in a decrease in sharpness. When a whetstone has deteriorated in sharpness, it is dressed to correct its surface by scraping off its surface using a repair tool made of a single diamond or the like. Once the grinding wheel has been dressed and its sharpness restored, it can be reused.

An example of a rotary dresser being used as a correction tool in this kind of tracing is shown in Japanese Patent Application Laid-open No.
It is described in Publication No. 59-64273. In this type of grinding machine, a rotary dresser is installed near a grindstone attached to a wheel head, and a rotary tool for dressing the grindstone can be moved toward and away from the grindstone using a fluid pressure cylinder or the like. Ru. Therefore, the rotary tool can be fed and moved within a certain range with respect to the rotating grindstone using a fluid pressure cylinder, thereby making it possible to dress the grindstone by a predetermined amount.

[The problem that the idea aims to solve]

In the case of such a dressing device for a grinding machine, in particular, there is no means or countermeasure for detecting the dressing position at which tracing starts, so if thermal deformation occurs in the grinding machine, the relative relationship between the grinding wheel and the rotary tool will be affected. position changes.

Since the rotary tool is designed to be fed toward the grindstone from a reference position on the base of the grinding machine, for example, the amount of dressing may be insufficient due to the influence of thermal deformation. Therefore, it is necessary to ensure a sufficient dressing amount to correct the surface roughness of the grinding wheel and clogging of the abrasive grains, and considering the above deformation,
The amount of feed movement of the rotary tool relative to the grindstone is set slightly large for safety reasons.

However, the amount of feed movement may sometimes result in an excessive dressing amount for the grindstone. If the amount of dressing is excessive, an expensive grindstone will be wasted and the number of times the grindstone will be used will be reduced, which is extremely uneconomical.

Even if the relative positions of the grindstone and the rotary tool change as described above, if you can confirm in advance the position where the two start contact, it is possible to reduce the influence of thermal deformation and provide a predetermined dressing amount. I can do it. For example, Japanese Utility Model Application Publication No. 59-78059 discloses a device that detects the generation of sparks due to contact between the grindstone and the dresser while rotating the grindstone and the dresser. According to this, based on the spark detection signal, the dressing can be performed by moving the dresser by a required dressing amount and moving the dresser horizontally within a set time.

However, unless there is strong contact between the grinding wheel and the dresser, sufficient sparks will not be generated for detection, and in many cases the purpose cannot be achieved unless a small amount of sparks caused by slight contact is instantaneously detected. The device is inevitably complicated, such as by providing an amplification device for the detection signal. In addition, since the detection method uses light, it is necessary to eliminate abrasive grain differentiation, etc.
Providing a device for that purpose has the disadvantage that the entire device becomes larger. Furthermore, since the amount of dressing is given in terms of time, if the sharpness of the grindstone changes, the actual amount of dressing changes, making it difficult to maintain high dressing accuracy.

The present invention was developed in consideration of these circumstances, and its purpose is to detect contact between the grinding wheel and the rotating tool, regardless of the deformation of the grinding machine due to thermal expansion, etc. to quickly and reliably detect contact between the two, and to maintain high detection accuracy, thereby enabling the grinding wheel to accurately and finely dress a predetermined amount of dressing with high precision; An object of the present invention is to provide a dressing position detection device for a grinding machine that is compact, easy to mount, and inexpensive.

[Means to solve the problem]

The present invention is applied to a dressing device for a grinding machine that is capable of detecting in advance that contact has started between the grinding wheel and a rotating tool for grinding wheel correction when the grinding wheel is being corrected by a rotary dresser. .

Its characteristics are as shown in Figure 1.
A rotary dresser 5 equipped with a wheel head 3 that rotatably supports a grindstone 2, a rotary tool 4 for correcting the grindstone 2, and relatively moves the rotary dresser 5 and the grindstone 2 toward and away from each other. A clutch 27 for releasing the connection between the feed movement means 6 and the rotary tool 4 and the rotary motor 28 for rotating it.
A rotation detecting means 7 is provided for detecting that the rotating tool 4, which is not rotating due to being released by the clutch 27, has rotated even if it comes into contact with the rotating grindstone 2. When the rotation detecting means 7 detects the rotation of the rotary tool 4, the clutch 27 instructs the connection operation, and the feed control means 8 instructs the feed movement means 6 to start the feed movement and the amount of feed movement. Equipped.

[Effect]

The rotary tool 4 for grinding wheel correction is released by the clutch 27 from the connection with the rotary motor 28 for rotating it. The rotary dresser 5 is brought close to the grinding wheel 2 which is being rotated supported by the wheel head 3 by the feeding movement means 6.
The rotary tool 4 attached to the rotary dresser 5 is
The rotating tool 4, which is in a non-rotating state by being released by the clutch 27, is brought close to the rotating grindstone 2.

When the rotary tool 4 contacts the grindstone 2, the rotary tool 4
starts rotating due to the frictional force generated between it and the grindstone 2. When the rotation detecting means 7 detects that the rotary tool 4 has started rotating, the feed control means 6 connects the rotary tool 4 and the rotary motor 28 with the clutch 27, and causes the feed moving means 6 to move the rotary tool 4. commands the start of the movement and the predetermined feed movement amount.
Then, the rotational drive of the rotary tool 4 is started, and the rotating tool 4 is fed and moved by the commanded movement amount, and the grinding wheel 2
is dressed in a predetermined amount.

[Effect of idea]

According to the present invention, even if the relative position between the rotating tool and the grinding wheel changes due to thermal deformation of a grinding machine, etc., the rotating grinding wheel and the clutch are in a released state and the rotating tool is not rotating. The contact can be easily detected, and based on that position, the grindstone can be dressed by a predetermined amount without being too much or too little. At this time, the presence or absence of contact between the grindstone and the rotary tool can be quickly and reliably detected, the detection accuracy can be increased, and dressing of a predetermined amount can be performed with high precision. The equipment for this purpose has been miniaturized and can be easily attached to a grinding machine.

〔Example〕

The present invention will be described in detail below based on examples thereof.

The dressing position detection device 1 shown in FIG.
a wheel head 3 that rotatably supports the
The grinding machine is provided with a rotary dresser 5 equipped with a rotary tool 4 for modifying the outer circumferential surface of the grinding wheel 2, a feed moving means 6 for moving the rotary dresser 5 toward and away from the grinding wheel 2, and the like. The rotary dresser 5 has a clutch 2 that releases the connection between the rotary tool 4 and the rotary motor 28 for rotating it.
7.

The dressing position detecting device 1 is a rotation detecting means that detects, by being released by a clutch 27, that the rotating tool 4, which is not rotating, has rotated even if it comes into contact with the rotating grindstone 2. 7
When the rotating rotation of the rotary tool 4 is detected by the rotation detection means 7, the feed control means 8 instructs the clutch 27 to operate the connection, and also instructs the feed movement means 6 to start the feed movement and the amount of feed movement. It has

As shown in FIG. 2, the grinding machine 9 equipped with such a rotary dresser 5 and a dressing position detection device 1 is an internal grinding machine that grinds, for example, the inner surface of a hole in the workpiece 10, and grinds the upper surface of the bed 11. The cutting table 12 and the grindstone table 13 are respectively indicated by arrows 14.
It is provided so as to be movable in the direction of arrow 15. The rotary dresser 5 is placed close to the grindstone table 13 and is movable in the direction of the arrow 16.

A main shaft 17 that is rotationally driven, a main shaft motor 18 and a speed reducer 19 that drive the main shaft 17 are provided on the upper surface of the cutting table 12 . And the main shaft 17
A chuck 20 for gripping the workpiece 10 is provided at one end, and a pulley 21 is attached to the other end. A belt 23 is stretched between the pulley 21 and a pulley 22 directly connected to the main shaft motor 16. A cutting motor 24 is attached to one end of the cutting table 12, and a cutting motor 24 is attached to one end of the cutting table 12.
can be moved in the direction of arrow 14, which is the cutting direction and the retreating direction.

A wheel head 3 incorporating a motor (not shown) is provided on the upper surface of the grindstone table 13, and the grindstone 2 is rotatably attached to a grindstone shaft 25 directly connected to the motor. Grindstone table 13
A table oscillator motor 26 is attached to one end, and is capable of index movement in which the grindstone 2 is advanced or retreated toward the work position in the direction of arrow 15, and traverse movement in which the grindstone 2 is moved by the grinding width during grinding. It is becoming. Then, in a position facing the grindstone 2 that has retreated from the working position,
The rotary dresser 5 is configured to be movable in the direction of arrow 16.

This rotary dresser 5 is used to dress the whetstone 2 that has worn out due to use and to repair it so that it can be reused. A rotary tool 4 is mounted on a drive shaft 29 which is connected via a clutch 27 to a rotary motor 28. Further, the rotary dresser 5 is provided with a rotation detection means 7 adjacent to the rotary tool 4 for detecting the rotation of the drive shaft 29 when the drive shaft 29 is in a non-driving state and is shut off by the clutch 27.

The rotation detection means 7 may be a known non-contact type sensor, and a rotation start detection signal from it is input to the feed control means 8. One end of the rotary dresser 5 including the rotation detection means 7 is supported by the other end of the feed movement means 6 attached to the edge of the bed 11, and the rotary dresser 5 moves the rotary tool 4 to the retracted grindstone 2 in a horizontal plane. When the grindstone 2 is tilted and brought into contact as shown in the figure, feeding movement for dressing can be performed, and when the grindstone 2 advances to the working position,
It is designed so that it can be retracted to the edge side of the bed 11.

The feed movement means 6 consists of telescopic arms 30 and 31 that are horizontally extended and retracted by a motor (not shown), one end of which is fixed to the edge of the bed 11 via a mounting member 32, and is used to control the feed. It is activated by a command from the means 8.

The feed control means 8 is provided in a microcomputer (not shown) that controls the overall grinding operation, and as described above, when the rotary tool 4 comes into contact with the grindstone 2, the rotation detection means 7 detects the start of rotation. Then, upon receiving the detection signal, it instructs the feed moving means 6 to start the feed movement of the rotary dresser 5 and the amount of feed movement stored in advance.

The operation of the dressing position detection position 1 in this grinding machine will be explained step by step below.

First, the table oscillation motor 26 is activated to move the grindstone 2 backward from the working position where the workpiece 10 is installed. The grinding wheel 2 is moved to the retreated position as shown in FIG. 2, and is placed on standby with the grindstone 2 rotated.

The rotary dresser 5, which had been retracted toward the side end of the bed 11, is moved forward by the feed moving means 6 so as to come into contact with the grindstone 2 by releasing the clutch 27.

When the rotary tool 4 contacts the waiting grindstone 2, the rotation of the grindstone 2 causes the rotary tool 4 to rotate, the rotation is detected by the rotation detection means 7, and a rotation detection signal is input to the feed control means 8. Ru.

The feed control means 8 receives the rotation detection signal and instructs the feed movement means 6 to start the feed movement of the rotary dresser 5 and a pre-stored feed movement amount.

The feed movement means 6 connects the clutch 27 in response to a command from the feed control means 8, starts the rotary motor 28, starts the feed movement of the rotary dresser 5, and applies a predetermined amount of movement to the grindstone 2. Dress the desired amount.

Although the feed moving means 6 is provided in the above embodiment, the rotary dresser 5 is attached to the cutting table 12, and the rotary dresser 5 is moved by the cutting motor 24, so that the feeding moving means is connected to the cutting motor. It is also possible to have a configuration including 24.

As explained above, according to the dressing position detection device of this embodiment, the rotating tool, which is not rotating due to the connection and release action of the clutch, can be easily detected by contact with the rotating grindstone. It can also be rotated. Therefore, the rotation detection means can accurately detect the point in time when the rotary tool contacts the grindstone, and can accurately detect the dressing position at which dressing begins.

As a result, even if thermal deformation occurs in the grinding machine and the relative positional relationship between the grinding wheel and the rotary dresser changes, dressing will always start from the accurately detected dressing position. The grindstone can be dressed by the amount of feed movement stored in advance in the feed control means, and the amount of dressing can be just the right amount.

Further, since a clutch is only provided between the rotary motor and the rotary motor provided for driving the rotary tool, the dressing position detection position can be made smaller and less expensive. Therefore, the present device can be easily mounted on a grinding machine, and its mountability is improved.

[Brief explanation of drawings]

FIG. 1 is an enlarged view of essential parts of a dressing position detection device for a grinding machine according to the present invention, and FIG. 2 is an overall plan view of the grinding machine to which the present invention is applied. 2...Wheelstone, 3...Wheel head, 4...Rotary tool, 5...Rotary dresser, 6...Feeding means, 7...Rotation detection means, 8...Feeding control means, 9...Grinding machine , 27...Clutch, 28...
rotating motor.

Claims (1)

[Scope of claim for utility model registration] When modifying a grindstone using a rotary dresser,
A dressing device for a grinding machine that is capable of detecting in advance the start of contact between a grindstone and a rotating tool for correcting the grindstone, comprising: a wheel head that rotatably supports the grindstone; and a wheel head that rotatably supports the grindstone; A rotary dresser equipped with a rotary tool for correction, a feed moving means for relatively moving the rotary dresser and a grindstone toward and away from each other, and a connection between the rotary tool and a rotary motor for rotating the same. a clutch for releasing; a rotation detecting means for detecting that the rotating tool, which is in a non-rotating state due to being released by the clutch, has rotated even if it comes into contact with a rotating grindstone; Feed control means for instructing the clutch to engage when the rotation of the rotary tool is detected by the detection means, and for instructing the feed movement means to start the feed movement and the amount of feed movement. A dressing position detection device for a grinding machine characterized by: