JPS6243834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grinding fluid supply device for a grinding device, and more specifically, the present invention provides a grinding fluid supply device for a grinding device, and more specifically, a grinding fluid supplying device for a grinding processing device, and more specifically, a grinding fluid supplying device for a grinding processing device. The present invention relates to a grinding fluid supply device that can enhance its effectiveness.

When grinding is performed, a grinding fluid is usually supplied to the grinding point. However, since the grinding wheel rotates at high speed, and its circumferential speed usually has a practical value of about 1000 to 3600 m/min, the outer periphery of the grinding wheel is covered with an air layer generated by the rotation of the grinding wheel. This shows a phenomenon in which the supplied grinding fluid tends to separate due to this air layer.

FIG. 1 is a model diagram showing an air layer generated around the outer periphery of a grinding wheel, and A indicates the grinding wheel.

When this grinding wheel is driven to rotate in the direction of the arrow, a strong air layer B that rotates in the same direction as the grinding wheel at approximately the same circumferential speed as the grinding wheel A is created at the position closest to the surface of the grinding wheel, and the grinding wheel an air layer C that is relatively close to the air layer C and rotates slightly slower than the air layer B;
The air layer D, which is influenced by the air layer C and rotates at a peripheral speed slower than C, and the air layer E, which is easily influenced by the air layer D, rotate in a laminar flow.

This air layer is quite strong near the surface of the grinding wheel, and is said to have a pressure of 5 atm or more depending on the circumferential speed of the grinding wheel.For this reason, as shown in Figure 2, the air layer is quite strong at the point closest to the surface of the grinding wheel. Even if liquid 2 is injected,
As shown in the figure, the grinding fluid may be excluded by air layers B, C, etc. and may not reach the part to be ground.

In order to improve this point, it has been considered to supply a large amount of high-pressure grinding fluid that can break the air layer, but in order to supply such a high-pressure and large amount of grinding fluid, Not only does it require the use of an expensive pump, but the grinding fluid also becomes extremely splashy, and the impact of the grinding fluid can make the workpiece unstable, especially when grinding a lightweight or long workpiece. There is a problem.

Furthermore, when Dr. Opitz, a well-known West German scientist, published an international study on high-speed grinding in 1971, he proposed a new grinding fluid supply nozzle equipped with a scraper-like baffle plate that scooped out the air layer. Figure 3 shows the outline of the system, which consists of a baffle plate a that scoops out the air layer formed around the outer periphery of the grinding wheel, and a surrounding plate b that gradually descends from the top of the baffle plate toward the surface of the grinding wheel. The nozzle has a triangular shape, and the tip b' of the surrounding plate b is injected with the grinding fluid 2 from the gap between it and the surface of the grinding wheel A.
It is designed to supply

The nozzle proposed by Dr. Opitzu blocks the air layers B, C, D, etc. with the baffle plate a, so it is better than the one shown in FIG. Because it has a shape that gradually descends toward the surface, an air flow is generated outside the nozzle as shown by the white arrow, and most of the grinding fluid is directed toward the grinding wheel by the triangular surrounding plate b. Since the grinding fluid is supplied in the tangential direction, the grinding fluid temporarily adheres to the surface of the grindstone, but immediately separates, making it difficult for the grinding fluid to reach the grinding point. In particular, in automatic processing machines that automatically insert and take out the workpiece, the nozzle must be installed at a considerable distance from the grinding point. Even the nozzle shown is insufficient.

Furthermore, as shown in Japanese Patent Publication No. 48-37314, it has a grinding fluid outlet 9a that spouts out the grinding fluid in a direction substantially perpendicular to the surface of the grindstone, and a grinding fluid outlet 9b that jets out the grinding fluid in the direction of the grinding point, that is, in the tangential direction. As is known, the grinding fluid outlet 9a in this device is for preventing clogging of the grinding wheel, and therefore the jetting pressure of the grinding fluid is high, and the grinding fluid outlet 9a
There is a considerable gap between the surface of the grinding wheel and the surface of the grinding wheel, and the grinding liquid reflected from the gap is scattered, and the grinding liquid is supplied tangentially from the outlet 9b to the grinding point. are doing.

In this way, the grinding fluid supply device in conventional grinding equipment cannot supply sufficient grinding fluid to the grinding point if the nozzle has to be installed at a considerable distance from the grinding point. It was hot.

The present invention improves the prior art as described above, and allows the grinding fluid to flow in layers while adhering to the surface of the grinding wheel, thereby ensuring that the grinding fluid reaches the grinding point even if the distance between the nozzle and the grinding point is quite large. It is an object of the present invention to provide a grinding fluid supply device that can supply grinding fluid to the grinding fluid.

In order to achieve the above objects, the present invention
a baffle plate that blocks an air layer formed on the surface of the grinding wheel as it rotates; a shroud that covers the surface of the grinding wheel over a distance necessary for the grinding fluid to travel around the grinding wheel; A box type enclosure with an opening at the bottom is constituted by an adjustment plate that determines the thickness of the liquid flowing out, and the baffle plate of the box type enclosure is placed at the rear with respect to the rotating direction of the grinding wheel, and the adjustment plate is placed at the front. Then, the adjusting plate is arranged facing the surface of the grinding wheel so that the distance between the lower end of the adjusting plate and the surface of the grinding wheel maintains the desired grinding fluid outflow thickness, and the adjusting plate is rotated with respect to the normal line from the center of the grinding wheel. 1 Kgf/cm ² in the box type enclosure.
The grinding fluid is supplied at the following pressure, and the grinding fluid is rectified by the adjusting plate, and flows out from between the lower end of the adjusting plate and the surface of the grinding wheel by wrapping it around the surface of the grinding wheel in a laminar flow. It is characterized by

Hereinafter, a principle embodiment of the present invention will be explained with reference to FIG.

In FIG. 4, A indicates a grinding wheel. In the present invention, a baffle plate 3 blocks an air layer formed on the surface of the grinding wheel A as it rotates, a surrounding plate 4 covers the surface of the grinding wheel A, and an adjustment plate 5 determines the thickness of the grinding fluid flowing out. A supply pipe 6 protrudes from the upper end of the box-shaped enclosure with an opening at the bottom.
The grinding fluid should be supplied at a pressure of 1 kgf/cm ² or less. The box-shaped enclosure is disposed facing the surface of the grinding wheel A so that the baffle plate 3 is at the rear with respect to the rotation direction of the grinding wheel and the adjustment plate 5 is at the front. A gap is maintained between the lower end and the surface of the grindstone 4, which determines the desired thickness of the grinding fluid flowing out. Although the specific structure thereof is arbitrary, for example, the entire box-type enclosure of the present invention may be attached so as to be able to swing, and the lower end of the adjustment plate 5 may be adjusted as indicated by the arrow 5' as required.

In this case, in the present invention, the angle β between the normal line from the center O of the grinding wheel and the bottom plate 5 is approximately 0°, that is, from a position approximately perpendicular to the surface of the grinding wheel, at most - to the rotational direction of the grinding wheel. 60°, preferably up to -30°. Also, the angle α between the normal line from the center O of the grinding wheel and the baffle plate 3
is not particularly important, but it should be approximately 0° to 80°.

Since the grinding fluid supply device of the present invention has the above-described configuration, the air layer Since the pressure is negative compared to that of
When the grinding fluid is supplied at a pressure of less than f/cm ² , the surface of the grinding wheel surrounded by the box-shaped enclosure is instantly and stably covered with the grinding fluid. In addition, if the supply pressure of the grinding fluid is higher than the above,
The supplied grinding fluid is reflected off the surface of the grindstone and cannot instantly and stably cover the surface of the grindstone as described above. In this way, the grinding fluid that stably covers the surface of the grinding wheel is controlled by the adjusting plate 5, which is tilted at 0 degrees or slightly negative with respect to the normal line from the center of the grinding wheel. A rectifying action is applied and the grinding fluid is attached to the surface of the grinding wheel, and the grinding fluid thus attached to the surface of the grinding wheel is rolled in a laminar flow from between the lower end of the adjustment plate 5 and the surface of the grinding wheel A to the surface of the grinding wheel. Some of it is scattered by the centrifugal force caused by the rotation of the whetstone and its thickness decreases, but it remains in the state Z where it is wrapped in a laminar flow around the surface of the whetstone and is the same as the outer circumference of the whetstone. While rotating at high speed, it reaches the grinding point located quite far away.

According to the experimental results, when β≈-30°, this nozzle is placed at a position of approximately 40° to the grinding wheel as shown in Figure 4, and the grinding fluid supply pressure is 0.5 to 1 Kgf/ ^cm2 , the grinding It was confirmed that the liquid flows in a laminar flow not only at the horizontal angle position but also below the horizontal position, adhering to the surface of the grindstone. In addition, if the above-mentioned β is -30° or more, the adhesion performance of the supplied grinding fluid to the grinding wheel gradually decreases, and even at -60°, it flows out with some adhesion, but from a practical point of view. β
is preferably from 0° to -30°.

As described above, according to the present invention, the grinding fluid supplied at a position away from the grinding point can reach the grinding point while remaining wrapped around the surface of the grindstone in a laminar flow state. It is possible to achieve effects that were previously unimaginable.As a result, it is possible to prevent clogging of the grindstone, extend the dressing interval, reduce scratches, improve surface roughness, etc. The improved cooling effect has the effect of preventing processing deterioration of the workpiece due to heat.

[Brief explanation of the drawing]

Fig. 1 is a schematic illustration of the air layer generated around the outer periphery of the grinding wheel, Fig. 2 is an illustration of the grinding fluid supply situation by a commonly used nozzle, and Fig. 3 is an explanation showing another conventional example. 4 are explanatory diagrams of the principle of the grinding fluid supply device of the present invention. A... Grinding wheel, B, C, D, E, X... Air layer, 1... Conventional nozzle, a... Baffle plate, 2...
Conventional supply grinding fluid, 3...baffle plate, 4...surrounding plate,
5... Adjustment plate, O... Grinding wheel center, Z... Laminar supply grinding fluid according to the present invention.

Claims (1)

[Claims] 1. A baffle plate that blocks an air layer formed on the surface of the grinding wheel as it rotates, and a shroud that covers the surface of the grinding wheel over a distance necessary for the grinding fluid to travel around the grinding wheel. A box-type enclosure with an opening at the bottom is constituted by an adjustment plate that determines the outflow thickness of the grinding fluid, and the baffle plate of the box-type enclosure is placed at the rear with respect to the rotational direction of the grinding wheel, and the adjustment plate is placed at the front. Then, the adjusting plate is placed facing the surface of the grinding wheel so that the distance between the lower end of the adjusting plate and the surface of the grinding wheel maintains the desired grinding fluid outflow thickness, and the adjusting plate is aligned with the normal line from the center of the grinding wheel. The box type enclosure is tilted backward at 0° to 30° in the direction of rotation, and 1 kg is loaded into the box-shaped enclosure.
Grinding fluid is supplied at a pressure of f/cm ² or less, and the grinding fluid is rectified by the adjustment plate and flows out from between the lower end of the adjustment plate and the surface of the grindstone by wrapping it around the surface of the grindstone in a laminar flow. A grinding fluid supply device for a grinding device, characterized in that: