JPS6113945B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centerless grinder for tapered workpieces.

BACKGROUND ART Centerless grinding of rotary parts such as various types of grinders without leakage of liquid, tapered workpieces such as bearing rollers, etc., has been conventionally carried out as shown in FIG. 1 or 2.

In Figure 1, the axis R _s of an adjusting grindstone R having a normal outer diameter is installed with the axis R s inclined at a required angle with respect to the axis G _s of a grinding wheel G, and thereby a tapered workpiece W supported on a blade B is The circumferential surface is adjusted by the grinding wheel R and the grinding wheel G.
It is designed so that it comes into contact with the In addition, in Fig. 2, the axis G _s of the grinding wheel G and the axis R _s of the adjusting wheel R
The grindstones are installed in parallel, and each grindstone has a tapered surface.

By the way, as is well known, in infeed centerless grinding, a workpiece supported on a blade is given a constant rotation by an adjustment grindstone, and the grinding wheel is rotated in the same direction as the workpiece at a much faster speed than the workpiece. Since grinding is performed by rotating the grinding wheel, if slippage occurs between the adjusting whetstone and the workpiece, the grinding accuracy will decrease.

However, in the conventional grinding process of the tapered workpiece shown in FIGS. 1 and 2, assuming that the large diameter part of the tapered workpiece W is rotated without any slippage by the adjustment grindstone, Since the circumferential speed of the small diameter portion is slower than that of the large diameter portion, the small diameter portion always rotates with slippage occurring between it and the adjustment grindstone. By the way, the method shown in Figure 1 has less slippage than the method shown in Figure 2, but as the taper angle increases, it is difficult to rotate the adjustment grindstone to correspond to the angle due to its relationship with the base of the grinding machine. be.

In this way, in conventional centerless grinding of tapered workpieces, a slipping phenomenon always occurs between the workpiece and the adjusting grindstone, and the actual part of the tapered workpiece where slipping occurs depends on the shape of the workpiece. Although it varies depending on the grinding conditions, this sliding phenomenon causes uneven wear of the adjusting grindstone, and it is necessary to perform dressing much more frequently than in the case of ordinary cylindrical workpieces. In order to improve this situation even slightly, we use a highly abrasion-resistant urethane rubber adjustment grindstone, but in any case, slippage occurs somewhere, so the workpiece moves at an uneven speed during grinding. The disadvantage is that it rotates, making it difficult to obtain high and stable machining accuracy.

The present invention eliminates the drawbacks of the prior art as described above, makes it possible to give a stable rotation to a workpiece using an adjusting grindstone, and makes it possible to grind a tapered workpiece with stable and high precision. It is something that should be kept in mind.

In order to achieve the above objects, the present invention has the following features:
A conical surface having the same apex as the conical apex of the tapered workpiece is formed from the end face of the adjustment grindstone to the outer periphery, and a cylindrical free portion is formed behind the conical surface, and the taper The present invention is characterized in that the grinding process is performed in a state where the apex of the workpiece and the apex of the conical portion of the adjustment grindstone are aligned. In this way, the workpiece and the adjustment grindstone can maintain a completely slip-free state, similar to the meshing of bevel gears, and provide stable rotation to the workpiece.

The main parts of the non-grinding machine according to the present invention will be explained below with reference to FIG.

In FIG. 3, G is a grinding wheel, R is an adjusting wheel, R _s is its axis, B is a blade, and W is a tapered workpiece. In the present invention, a conical surface 2 is formed from the end surface 1 of the adjusting grindstone to the outer periphery, and the conical surface 2 has its apex O coincident with the apex O of the tapered workpiece W, as shown in FIG. , the apex O of the tapered workpiece W supported on the blade B
The adjusting whetstone axis R _s is installed so as to be inclined so that the apex O of the conical surface 2 of the adjusting whetstone coincides with the apex O of the conical surface 2 of the adjusting whetstone, and the grinding process is performed in this state. In this case, the dressing surface of the adjusting whetstone is of course the conical surface 2, and therefore, when the whetstone is worn out, the thickness will be increased in the axial direction, and in that case, the dressing surface of the adjusting whetstone The direction of movement is in the direction of arrow A. Further, in the case of this embodiment, since the center portion on the tip side of the adjusting grindstone is unnecessary, a recessed portion 3 is formed therein. 1 is a cylindrical allowance formed at the rear following the conical surface 2, and arrow C is the cutting direction.

As described above, the present invention forms a conical surface having the same apex as the apex of the cone of the tapered workpiece from the end face of the adjusting grindstone to the outer periphery, and forms a conical surface having the same apex as the cone of the tapered workpiece and the conical surface of the adjustment whetstone. Since the grinding process is performed in a state where the apex of At the same time, the smooth rotation of the workpiece during grinding makes it possible to obtain a product with stable and high precision, and when the adjusting grindstone is worn out, the cylindrical allowance allows for normal maintenance. Dressing can be performed in the same way as a non-grinding machine, and this has the effect of clearly solving the problems of taper machining, which have traditionally required very delicate adjustments.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing a conventional method for grinding a tapered workpiece, and FIG. 3 is an explanatory diagram of the principle of the present invention. G... Grinding wheel, R... Adjusting grindstone, R _s ... Adjusting grindstone shaft, B... Blade, 2... Conical surface, O...
…vertex.

Claims (1)

[Claims] 1. In a centerless grinder in which a tapered workpiece supported on a blade is rotated by an adjustment whetstone and the workpiece is ground by the grinding wheel, from the end face of the adjustment whetstone to the outer periphery. A conical surface having the same apex as the apex of the cone of the tapered workpiece is formed, and a cylindrical allowance is formed at the rear of the conical surface, so that the apex of the tapered workpiece and the cone of the adjusting grindstone are formed. A centerless grinder for a tapered workpiece, characterized in that the workpiece is ground by bringing the tapered workpiece into contact with a conical surface of an adjustment whetstone in a state where the apexes of the surfaces are aligned.