JPH052286Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coolant nozzle for a dresser used for dressing grinding tools.

[Conventional technology and its technical issues]

Grinding wheels have a self-sharpening effect on the cutting edge, but in practice, this can lead to blindness or spillage, which reduces grinding efficiency and results in a poor surface finish. Therefore, in grinding work, dressing, which crushes dull abrasive grains and creates new cutting edges, is essential, and this dressing (truing is also performed at the same time) is performed several dozen times a day on a single grinder. It is often done. A diamond dresser in which diamonds are embedded in the end face of a shank is commonly used as a means for performing such work.

This diamond dresser is used by being attached to a support stand at a required angle to the grindstone, but it is important to cool the diamond so that it does not heat up during dressing. This is because diamond oxidizes in air at a temperature of approximately 680 to 700°C, and the frictional heat during dressing greatly exceeds this temperature.

As a countermeasure against this problem, a coolant nozzle is used, but conventionally, the nozzle 5 is used as shown in Fig. 5a.
00 had a tapered shape, was attached in the tangential direction of the grindstone 1 independently of the dresser 2, and was designed to spray coolant. For this reason, the coolant liquid spreads widely and cannot be concentrated at the dressing point, making it impossible to perform effective cooling. In addition, as another format, as shown in Figure 5b,
There is also a system in which a pipe-shaped nozzle 500' is attached to the support base 8, and its nozzle 501 is directed toward the diamond of the dresser 2, but since the coolant nozzle protrudes largely from the support base 8, this poses an obstacle when replacing the dressing diamond. In addition, there was a problem that it was extremely complicated because it required fine adjustment to match the protrusion amount of the dresser.

For these reasons, in the past, it was difficult to cool the diamond sufficiently during dressing, leading to severe consumption of the expensive diamond and high dressing costs.

The present invention was developed through research to solve the above-mentioned problems.The purpose of this invention is to have an extremely simple structure and installation, to eliminate the need for adjustment after installation, and to make the dressing point An object of the present invention is to provide a coolant nozzle for a dresser of this type that can efficiently supply coolant.

[Means to solve the problem]

In order to achieve the above object, the present invention is designed to be held in a dresser by simply fitting it into a single-stone or multi-stone shaft-type dresser, and to supply coolant liquid to surround the diamond through the outer periphery of the dresser. In other words, a ring-shaped recess connected to the coolant supply pipe is provided in the nozzle body, a holding part that comes into close contact with the outer circumference of the shank of the dresser is provided on the rear side of the ring-shaped recess, and a shank is provided on the front side of the ring-shaped recess. An opening is formed to form a minute annular nozzle with the outer periphery.

The nozzle body is made of a metal material such as aluminum, as well as a non-metallic material such as plastic or ceramic, and the holding part may be made of a separate member such as an O-ring and attached to the nozzle body, or it may be attached to the nozzle body. It may be substantially integrated. In the present invention, the dresser is not limited to a grindstone as long as it is of a shaft type, and includes dressing and truing means for various grinding tools provided with abrasive grains.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of a coolant nozzle for a dresser according to the present invention. 1 is a grindstone, 2 is a dresser, a diamond 3 is fixed to the tip of a shank 20, and the shank 20 is fixed to a dressing stand or table (not shown) by a holder 4.

5 is a nozzle body, which is ring-shaped as a whole. A ring-shaped recess 50 having an inner diameter sufficiently larger than the outer diameter D of the shank 20 is formed in the axially intermediate portion of the nozzle body 5, and a coolant introduction hole 51 is formed on the outer diameter side of the ring-shaped recess 50.
A coolant supply pipe (hose) 6 is connected to this.

An opening 52 that is concentric with the ring-shaped recess 50 and has a suitably larger diameter than the outer diameter D of the shank 20 is formed on the front side in the axial direction of the ring-shaped recess 50, and an annular nozzle 53 is formed between the opening 52 and the outer peripheral surface of the shank 20. It is starting to be configured.

Further, a ring protrusion 54 having a diameter suitably larger than the outer diameter D of the shank 20 is formed on the rear side of the ring-shaped recess 50 in the axial direction, and a holding part 7 that can be brought into close contact with the shank 20 is provided here. In FIGS. 1 to 3, a circumferential groove 540 is formed in the ring protrusion 54, and an O-ring 7 is attached thereto as a holding portion. In FIG. 3a, the holding portion 7 is formed integrally with the ring protrusion 54, and although the illustrated one has a tongue shape, the holding portion 7 is not limited to this. "Integrated" includes cases by insert molding, in-mold molding, etc.

[Effect of the embodiment]

Since the present invention has the above-described configuration, the shank 2 can be attached while the dresser 2 is fixed to the holder 4.
This fitting brings the holding part 7 into frictional contact with the outer periphery of the shank, so that it is automatically held concentrically with the dresser 1, and the ring-shaped nozzle 53 is formed by the shank 20 and the opening 52. Even if the amount of protrusion of the dresser 2 is adjusted, there is no need to adjust the nozzle.

All that is left to do is to supply the coolant liquid from the supply pipe 6, and the Kuhnt liquid enters the ring-shaped recess 50 surrounding the outer periphery of the shank from the introduction hole 51, and flows out from there in an annular manner through the ring-shaped nozzle 53. The shank 20 is effectively cooled by this flow, and the coolant liquid flows to surround the shank end face 200 and is poured onto the diamond 3 at the tip. Therefore, even with side dressing, coolant fluid can be efficiently and concentratedly supplied to the dressing points, and the diamond can be reliably cooled with a small amount of coolant fluid, reducing wear and tear caused by frictional heat.

Since the holding portion 7 increases the contact pressure with the shank 20 by introducing the coolant liquid, there is no fear of leakage of the coolant liquid or separation of the nozzle body 5.

The Krant nozzle of this invention was applied to a single-stone dresser, and the grinding wheel circumferential speed was approximately 31 m/s, and the cutting depth was 0 to 20 μm/
Truing and dressing of the shaped grindstone was performed under conditions of one pass and dressing speed of approximately 4.8 to 8/1 pass.

Figure 4 shows the change in diamond wear compared to the conventional type (Figure 5a) under the same conditions. The diamond wear was measured by the change in height from the bottom of the diamond. Figure 4 shows that the present invention reduces wear by at least 20% compared to the conventional coolant nozzle.

[Effect of idea]

According to the present invention described above, it is easy to install and remove, and the coolant can be efficiently supplied and cooled to the dressing point.
This has the advantageous effects of significantly extending the life of the diamond, making it easier to handle, and appropriately reducing dressing costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the coolant nozzle for a dresser according to the present invention in use, Fig. 2 is a sectional view of the unit alone, Fig. 2a is a partial sectional view showing another embodiment, and Fig. 3 is a plan view, FIG. 4 is a graph showing the performance test results of the nozzle of the present invention and a conventional nozzle, and FIGS. 5a and 5b are explanatory diagrams of a conventional coolant nozzle. DESCRIPTION OF SYMBOLS 1... Grindstone, 2... Dresser, 3... Diamond, 5... Nozzle body, 6... Coolant liquid supply pipe, 50... Ring-shaped recess, 52... Opening, 5
3...Ring-shaped spout, 54...Ring-shaped protrusion, 7
...Holding section.

Claims (1)

[Scope of utility model registration request] A ring-shaped recess is provided in the nozzle body to be connected to the coolant supply pipe, and a holding part that can be brought into close contact with the outer periphery of the shank of the dresser is provided on the rear side of the ring-shaped recess. A coolant nozzle for a dresser, characterized by having an opening for forming a minute annular nozzle.