Cleaning and liquid contact with solids – Processes – Work handled in bulk or groups
Reexamination Certificate
2001-08-15
2004-08-31
Kornakov, M. (Department: 1746)
Cleaning and liquid contact with solids
Processes
Work handled in bulk or groups
C134S001000, C134S022100, C134S023000, C134S025100, C134S025500, C134S040000
Reexamination Certificate
active
06782898
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ring-shaped part washing method for removing foreign substances adhering to an inner race or an outer race of a rolling bearing therefrom using ultrasonic waves and a washing jig used in the ring-shaped part washing method.
2. Description of the Related Art
An inner race or outer race (the inner race or outer race is hereinafter referred to as a ring-shaped part) of a rolling bearing, due to the role thereof, requires high cleanliness and, therefore, the ring-shaped part is washed before it is assembled as a rolling bearing. Conventionally, for such washing, there is employed a washing method using ultrasonic waves. In the washing method, for example, as shown in
FIG. 14
, an ultrasonic vibration plate
5
is disposed on the bottom surface of a washing tank
3
which is filled with a washing fluid
1
, ring-shaped parts
9
stored in a basket
7
are immersed into the washing tank
3
together with the basket
7
, and ultrasonic waves generated from the ultrasonic vibration plate
5
are applied to the ring-shaped parts
9
to thereby remove foreign substances adhering to the surfaces of the ring-shaped parts
9
therefrom.
On the other hand, in the case of a washing method which does not use the basket
7
, as shown in
FIG. 15
, a skewer-shaped member
11
is inserted through the inner peripheries of a plurality of ring-shaped parts
9
, the ring-shaped parts
9
are immersed into the washing tank
3
together with the skewer-shaped member
11
, and ultrasonic waves generated from the ultrasonic vibration plate
5
are applied to the ring-shaped parts
9
to thereby remove foreign substances adhering to the surfaces of the ring-shaped parts
9
therefrom. According to this washing method, the outer peripheral surfaces of the ring-shaped parts
9
can be prevented from damage and a large number of ring-shaped parts
9
can be washed at the same time.
However, neither the conventional washing method using a basket nor the conventional washing method using a skewer-shaped member takes into sufficient consideration that the ultrasonic waves propagate straight, which makes it difficult to obtain a satisfactory washing effect. That is, in the washing method using a basket shown in
FIG. 14
, the ultrasonic waves are applied to the end faces
9
a
of the ring-shaped parts
9
at right angles to thereby obtain a washing effect, whereas the ultrasonic waves propagate straight in parallel to the outer peripheral surfaces
9
b
and inner peripheral surfaces
9
c
of the ring-shaped parts
9
, which makes it hard to provide a satisfactory washing effect. On the other hand, in the washing method using a skewer-shaped member shown in
FIG. 15
, the ultrasonic waves are applied to the outer peripheral surfaces
9
b
of the ring-shaped parts
9
to thereby obtain a washing effect, whereas the ultrasonic waves propagate straight in parallel to the end faces of the ring-shaped parts
9
and the ultrasonic waves cannot be propagated to the inner peripheral surfaces
9
c
of the ring-shaped parts
9
thereby having dead grounds, which are areas where ultrasonic waves cannot be applied, on the inner peripheral surfaces
9
c
, so that a satisfactory washing effect cannot be obtained.
SUMMARY OF THE INVENTION
The present invention aims at eliminating the drawbacks found in the above-mentioned conventional washing methods. Accordingly, it is an object of the invention to provide a ring-shaped part washing method capable of applying ultrasonic waves to all of the outer peripheral surfaces, inner peripheral surfaces and end faces of ring-shaped parts at the same time, and a washing jig used in the washing method, thereby being able to enhance a washing effect on the ring-shaped parts.
In attaining the above object, according to a first aspect of the invention, there is provided a ring-shaped part washing method in which an ultrasonic vibration plate is disposed in a washing tank filled with a washing fluid, and ultrasonic waves generated by the ultrasonic vibration plate are applied to ring-shaped parts disposed within the washing tank to thereby remove foreign substances adhering to the ring-shaped parts therefrom. The ring-shaped parts are disposed inclinedly with respect to the ultrasonic vibration plate in such a manner that the axes of the ring-shaped parts intersect with the plate surface of the ultrasonic vibration plate at other angles than a right angle.
According to the present ring-shaped washing method, since the ring-shaped parts are disposed inclinedly with respect to the ultrasonic vibration plate in such a manner that the axes of the ring-shaped parts intersect with the plate surface of the ultrasonic vibration plate at other angles than a right angle, the inner peripheral surfaces and outer peripheral surfaces of the ring-shaped parts extending in parallel to the axes of the ring-shaped parts as well as the two end faces of the ring-shaped parts intersecting with the axes of the ring-shaped parts at right angles can be all disposed at given inclination angles with respect to the ultrasonic waves to be applied from the ultrasonic vibration plate. Also, the ultrasonic waves generated from the ultrasonic vibration plate or reflected from the liquid surface can be positively applied onto the inner peripheral surfaces of the ring-shaped parts thereby not having the dead grounds, which are areas where ultrasonic waves cannot be propagated, on the inner peripheral surfaces of the ring-shaped parts. Thanks to this, the ultrasonic waves can be applied equally onto all of the outer surfaces of the ring-shaped parts, which makes it possible to obtain a high washing effect.
And, in the case of the present ring-shaped washing method, the above-mentioned angle can be set in the range of 30°-60°.
According to the present ring-shaped washing method, when the ring-shaped parts are inclined disposed in such a manner that the axes thereof intersect with the plate surface of the ultrasonic vibration plate at an angle of 45°, the average handling quantity can be secured not only without having the above-mentioned dead grounds on the inner peripheral surfaces of the ring-shaped parts, but also without increasing the distance between the ring-shaped parts. Also, in the case of ring-shaped parts each having a narrow width in the axial direction thereof, when the ring-shaped parts are inclined disposed in such a manner that the axes thereof intersect with the plate surface of the ultrasonic vibration plate at an angle of 30°, not only propagation of the ultrasonic waves at the inner peripheral surfaces of the ring-shaped parts can be secured but also the washing quantity can be increased. Further, when the ring-shaped parts are inclined disposed in such a manner that the axes thereof intersect with the plate surface of the ultrasonic vibration plate at an angle of 60°, even in the case of ring-shaped parts each having a wide width in the axial direction thereof as well, propagation of the ultrasonic waves to the inner peripheral surfaces of the ring-shaped parts can be secured positively.
And, the ring-shaped part washing method may also be performed that a linear-shaped support member having a plurality of notches respectively for supporting the ring-shaped parts in an inclined manner is inserted into the inner peripheral sides of the ring-shaped parts with the notches facing downward and thus the ring-shaped parts are supported on the support member in such a manner that the ring-shaped parts hang down from the support member; and, after then, the support member is rotated by 180° to turn the notches onto the upper portion side of the support member and thus the upper portions of the inner peripheries of the ring-shaped parts are put in to the notches, whereby all of the ring-shaped parts are inclined supported on the support member at the same time.
According to this ring-shaped parts washing method, the support member is inserted into the inner peripheral portions of the plurality of ring-shaped parts to thereby su
Kashimoto Masaji
Kurashima Takayuki
Mizuno Hiroki
Tokura Shigeo
Kornakov M.
NSK LTD
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