JPS6044108B2 - Centerless grinding machine for workpieces with different diameter parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-stop grinding machine for workpieces having different diameter parts, which enables simultaneous non-stop grinding of different diameter parts of workpieces having large diameter differences. be.

As is well known, in a centerless grinding machine, a blade is placed between a grinding wheel and an adjusting wheel, and the adjusting wheel gives a workpiece supported on the blade a rotational motion at the same peripheral speed as the rotating peripheral speed. Circular grinding is performed by a grinding wheel that is rotated at a higher speed while giving By the way, in hypocardial arrest grinding, the workpiece is ground at a fixed position, so it should be possible to grind even if the workpiece has a difference in diameter.
When grinding different diameter parts of a workpiece with different diameters at the same time, for example, when grinding a stepped shaft having a small diameter part a and a large diameter part as shown in Fig. 1, the circumferential speed of the small diameter part a Since the circumferential speeds of the large diameter part and the large diameter part are different, either the small diameter part a and the adjusting grindstone Ra in contact with it, or the large diameter part b and the adjusting grindstone Rb in contact with it are ground together.

G is a grinding wheel. In this way, when parts with different diameters are ground simultaneously, a burr will always occur somewhere between the adjusting wheel and the workpiece, so that part of the adjusting wheel will wear out faster than other parts, causing damage to the workpiece. There is a problem in that the accuracy of the method is reduced.

As a countermeasure against the above problem, the material of the adjusting whetstone may be made of a particularly hard material, or the sliding adjusting whetstone (adjusting whetstone R in FIG. 1) may be replaced with the other adjusting whetstone R.

Measures are being taken to make it more wear resistant, but
There is a limit to such countermeasures, and empirically, it is said that the limit is about twice the diameter difference, and if it is more than that, it is impossible to carry out hypochondral grinding, and if the diameter difference is less than twice Even so, it was not possible to avoid a decrease in machining accuracy. For this reason, as shown in Fig. 2 A and 2, for workpieces with a diameter difference of several times as large and where concentricity between the shaft portion and the large diameter portion is functionally required, Up to now, it has been necessary to carry out a double process of first grinding only the shaft portion, and then grinding or cutting the remaining large diameter portion using the shaft portion as a reference.

The present invention improves the above-mentioned points, and makes it possible to simultaneously grind the different diameter parts of workpieces with a diameter difference of several times as much as shown in Fig. 2 with high accuracy. The purpose is to provide a grinding machine.

An embodiment thereof will be described below with reference to FIG. In FIG. 3, 1 is a workpiece, 1a is a small diameter portion thereof, and 1b is a large diameter portion thereof. Reference numeral 2 denotes a grinding wheel, and a small-diameter ground portion 2a and a large-diameter ground portion 2b are formed by dressing according to the shape of the workpiece.

In the present invention, the adjusting whetstone is supported by a fixed part fixed to the adjusting whetstone shaft so as to be freely rotatable with respect to the adjusting whetstone shaft, and is integrally coupled with the adjusting whetstone shaft or the fixed part as necessary. It is characterized in that it is constructed by a freely rotatable part that is made as possible.

That is, for example, as shown in FIG.
It is divided into a fixed part 3a for the part 2a of the grinding wheel and a free rotation part 3a for the part 2b of the grinding wheel, the fixed part 3a is fixed to the adjustment wheel shaft 4, and the free rotation part 3b is fixed to the support ring 5. The pin 7 is fitted and held and is attached to the adjusting grindstone shaft 4 via a bearing 6 so as to be freely rotatable, and the pin 7 is attached to the support ring so as to be detachable. When inserted into the insertion hole 8 provided in the fixed part 3a of the adjustment grindstone, the fixed part 3a and the freely rotating part 3b can be integrally connected.

Since the centerless grinding machine of the present invention is constructed as described above, when the pin 7 is removed during grinding, the workpiece is removed from its small diameter portion 1a.
The large diameter portion 1b of the workpiece is controlled by the free rotation portion 3b of the workpiece, which rotates freely relative to the adjustment grindstone shaft 4, without slipping, and this free rotation. The workpiece is subjected to grinding resistance due to portion 3b. Since the blade is prevented from escaping, it is possible to grind workpieces having different diameter parts extremely smoothly and with high precision.

In addition, in the present invention, the freely rotating portion 3b of the adjusting whetstone can be integrally combined with the fixed portion 3a as required, so when dressing the adjusting whetstone, the two are integrated and normally It is possible to perform high-precision dressing that is no different from traditional dresses.

As mentioned above, when centerless grinding a workpiece with a large diameter difference, such as a stepped workpiece, conventionally the adjustment grindstone suffers uneven wear due to slippage, which has a large effect on machining accuracy, so the shape In the past, it was not possible to perform centerless grinding, but according to the present invention, the adjustment grindstone does not slip no matter how large the diameter difference, so even workpieces with large diameter differences can be ground with extremely high precision. There is an advantage that no grinding can be performed, and the present invention has the advantage that it can be implemented immediately even with a known grinding machine by slightly modifying it.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a simultaneous grinding mechanism for different diameter parts, Fig. 2 A is a plan view showing an example of a workpiece with a large diameter difference, and Fig. 3 is an example of the inventive non-grinding machine. FIG. 3 is a cross-sectional view of main parts.

Claims (1)

[Claims] 1. In a centerless grinder configured to perform circular grinding on a workpiece supported on a blade between an adjustment whetstone and a grinding wheel, the adjustment whetstone is connected to a fixed part fixed to an adjustment whetstone shaft and an adjustment whetstone. The grinding wheel is supported so as to be able to rotate freely relative to the shaft, and also has a freely rotating part that can be integrally connected with the grinding wheel shaft or the fixed part for adjustment as necessary, and the free rotating part is freely rotated during grinding. A centerless grinding machine for workpieces having different diameter parts, characterized in that it is integrally connected to an adjusting grindstone shaft or a fixed part during dressing and dressing.