JPH068143A - Cooling liquid feed device - Google Patents

Abstract

PURPOSE:To enable cooling liquid to be supplied to a proper position by changing a laminar air flow generated near the external surface of a grinding wheel due to the high speed rotation thereof, and straightening the flow to such state as causing the liquid to be easily drawn onto the surface of the grinding wheel. CONSTITUTION:A straightening vane 3 having aerofoil section is laid in such a way as variable in angle near the external surface of a rotatable grinding wheel 1, and the diameter of the wheel 1 is detected. Also, a straightening vane angle control device is made to properly control the angle of the vane 3, relative to the external surface of the wheel 1, according to the diameter thereof. In addition, a laminar air flow generated near the surface of the wheel 1 and turning in such a way as following the rotation thereof, is changed and straightened. Then, cooling liquid jetted from a coolant nozzle 4 laid near the vane 3 to the external surface of the wheel 1 is guided to a grinding point on the straightened laminar air flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone such as a grinder and a device for supplying a coolant to a grinding point of a work ground by the grindstone.

[0002]

2. Description of the Related Art In general, a coolant supply device for a grinder or the like has a coolant nozzle arranged near the front cover of a grindstone in a tangential direction of the grindstone.

[0003]

On the outer peripheral surface of the grindstone that rotates at a high speed, an air layer is formed in which the air around the grindstone rotates as the grindstone rotates. Since the speed difference between the grinding wheel peripheral speed and the coolant liquid flow velocity is small, the coolant liquid ejected in the tangential direction of the grinding stone from the coolant nozzle due to this air layer cannot reach the grindstone surface, and most of the coolant liquid is different from the grinding point. The coolant was not delivered to the grinding point effectively because it was transported to the point.

In order to solve this problem, a method has been adopted in which the coolant nozzle is directed in the radial direction of the grindstone, the air layer is broken, and the coolant liquid is wound around the grindstone and conveyed to the grinding point. However, in this method, since the coolant does not have a velocity component in the circumferential direction of the grindstone, there is a problem that the amount of momentum that the grindstone must give to the coolant increases, and the power consumption for rotating the grindstone increases.

In view of the above-mentioned conventional problems, an object of the present invention is to change the flow of an air layer generated in the vicinity of the outer peripheral surface of a grindstone by high speed rotation so as to rectify the coolant into a state in which the surface of the grindstone is easily sucked. That is, the coolant was supplied to the appropriate points.

[0006]

SUMMARY OF THE INVENTION A feature of the present invention that achieves the above-mentioned object is to adjust the airfoil cross-sectional shape arranged so that the position can be changed in the vicinity of a grinding point on the outer peripheral surface of a rotatable grindstone. A plate, and a rectifying plate position control device that detects the diameter of the whetstone and appropriately changes the position of the rectifying plate with respect to the outer peripheral surface of the whetstone according to the whetstone diameter, and the coolant between the rectifying plate and the outer peripheral surface of the whetstone A coolant nozzle for supplying the liquid is provided.

[0007]

With the above construction, the angle of the straightening vane is changed according to the diameter of the grindstone based on the detected grindstone diameter, the distance between the straightening vane and the grindstone is kept at an appropriate interval, and the flow of the airfoil cross section of the straightening vane is maintained. The air layer is changed by the theorem that the pressure decreases toward the inside of the linear curve, so that the coolant liquid ejected from the coolant nozzle can be reliably guided to the grinding point.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a grindstone which is rotatably supported by the grindstone base 13 of FIG. 2, 2 is a grindstone front cover which covers the upper front end of the grindstone 1, and W is a workpiece.

Reference numeral 3 is a straightening vane having a cross-sectional shape of an airfoil which is arranged close to the outer peripheral surface of the grindstone 1 and above the grinding point P where the workpiece W and the grindstone 1 contact each other so that the angle can be changed. The plate 3 is provided with a coolant nozzle 4 which ejects a coolant liquid toward the grindstone 1. Reference numeral 5 is a coolant liquid hose. 6 is a non-contact distance sensor that detects the diameter of the grindstone. This non-contact distance sensor 6 changes the angle of the straightening vane 3 according to the diameter of the grindstone by a straightening vane angle control device 7 described later, and keeps the distance between the straightening vane 3 and the grindstone 1 at an appropriate interval.

As shown in FIG. 2, the rectifying plate angle control device 7 includes a servo motor 8 having an encoder 9 for detecting an absolute angle, a drive gear 10 provided on a rotary shaft of the servo motor 8, and the rectifying device. It is provided on the rotary shaft of the plate 3 and is composed of a driven gear 11 meshed with the drive gear 10.

As shown in FIG. 3, the control circuit of the straightening vane angle control device 7 inputs the detection signal of the grindstone diameter by the non-contact distance sensor 6 and detects the moving amount of the straightening vane 3 by the encoder 9. , A computer numerical control device 14 (hereinafter abbreviated as a CNC device) for inputting this signal, and this C
It is composed of a pulse generator 15 which generates pulses corresponding to the rotation amount in response to a command from the NC device 14, and a motor drive circuit 16 which applies a drive current to the servo motor 8 by the pulse generated by the pulse generator 15. The relationship between the detection signal of the non-contact distance sensor 6 and the rotation angle of the servo motor is as shown in FIG. 4, and the rotation direction is the forward rotation in the arrow direction of FIG.

Since the present invention has the above-described structure, the servomotor 8 is rotationally driven according to the diameter of the grindstone 1 detected by the non-contact distance sensor 6, the angle of the rectifying plate 3 is changed, and the rectifying plate 3 is changed. The distance between and the grindstone 1 is maintained at an appropriate interval.
In addition, the coolant is discharged from the coolant nozzle 4 to the grindstone 1.
Gush toward the surface of the.

On the other hand, in the vicinity of the surface of the grindstone 1 rotating at a high speed, an air layer is formed which rotates as the grindstone 1 rotates.
This air layer changes and straightens the flow of the air layer when passing through the straightening vane 3, and the pressure drops due to the streamline curve of the straightening vane 3 facing the surface side of the grindstone 1. The coolant liquid is sucked into the flow of the air layer, and the coolant liquid is guided to the surface of the grindstone 1 to reliably guide the coolant liquid to the grinding point P.

In the above-mentioned embodiment, the coolant nozzle 4 is provided on the straightening vane 3. However, the coolant nozzle 4 is arranged in the vicinity of the straightening vane 3 in the tangential direction of the grindstone as in the conventional general structure. However, the above-mentioned effect can be obtained. Also,
The straightening vane 3 may be moved so that the distance between the straightening vane 3 and the grindstone 1 is appropriately maintained without changing the posture of the straightening vane 3.

[0015]

As described above, according to the present invention, a rectifying plate having an airfoil cross section, which is arranged so as to be able to change its position in the vicinity of a grinding point on the outer peripheral surface of a rotatable grindstone, and the outer peripheral surface of the grindstone by detecting the grindstone diameter With a straightening vane position control device that appropriately changes the position of the straightening vane with respect to the diameter of the grindstone, and a coolant nozzle that supplies a coolant liquid between the straightening vane and the outer peripheral surface of the grindstone is provided. Therefore, the straightening plate is always controlled at an angle according to the diameter of the grindstone to maintain the distance between the grindstones at an appropriate interval, and the flow of the air layer that circulates around the grindstone near the surface of the grindstone is rectified and rectified. Due to the flow of the air layer, a large amount of the coolant liquid ejected from the coolant nozzle onto the surface of the grindstone can be reliably guided to the grinding point without increasing the rotational power of the grindstone.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the device of the present invention.

FIG. 2 is a plan view showing an embodiment of the device of the present invention.

FIG. 3 is a control circuit diagram for controlling the device of the present invention.

FIG. 4 is a diagram showing a relationship between a signal of a non-contact distance sensor and an angle of a rectifying plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone 3 Rectifier plate 4 Coolant nozzle 6 Non-contact distance sensor 7 Rectifier plate angle control device 8 Servo motor 9 Encoder 10 Drive gear 11 Driven gear 12 Rotation shaft 14 Computer numerical control device 15 Pulse generator 16 Motor drive circuit

Claims (1)

[Claims] 1. A grindstone such as a grinder and a coolant supply device for supplying a coolant to a grinding point of a workpiece ground by the grindstone, the position of which can be changed in the vicinity of the grinding point on the outer peripheral surface of the grindstone. A rectifying plate having an airfoil cross-sectional shape arranged in, and a rectifying plate position control device that detects the grindstone diameter and appropriately changes the position of the rectifying plate with respect to the grindstone outer peripheral surface according to the grindstone diameter, the rectifying plate and the A coolant liquid supply device characterized in that a coolant nozzle for supplying a coolant liquid is provided between the grindstone and the outer peripheral surface thereof.