Turning – Process of turning
Reexamination Certificate
2000-11-03
2003-04-22
Tsai, Henry W. H. (Department: 3722)
Turning
Process of turning
C082S001300, C082S047000
Reexamination Certificate
active
06550360
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for chamfering the cam plate of a swash plate compressor.
There has been widely used a swash plate compressor, which as shown in
FIG. 1
, comprises a cylinder block
1
provided with cylinder bores
2
, pistons
3
inserted into the cylinder bores
2
to be slidable, a driving shaft
4
, a cam plate
5
slantedly fixed to the driving shaft
4
and shoes,
6
inserted between the cam plate
5
and the pistons
3
. The cam plate
5
of the swash plate compressor is ellipsoidal. The circumferential surface
5
a
of the cam plate
5
forms a cylindrical surface extending coaxially with the driving shaft
4
to avoid interference with the pistons
3
.
As seen from
FIG. 1
, the circumferential surface
5
a
is present between an acute-angled edge
5
a
′ and an obtuse-angled edge
5
a
″. The acute-angled edge
5
a
′ is closer to the pistons
3
than the obtuse-angled edge
5
a
″ and liable to interfere with the pistons
3
. Therefore, the acute-angled edge
5
a
′ must be chamfered.
As shown in
FIG. 2
, the operation of chamfering the acute-angled edge
5
a
′ has been carried out by a method comprising the steps of rotating the cam plate
5
around a central axis X extending coaxially with the driving shaft
4
, abutting the blade
7
a
of a cutting tool
7
against the acute-angled edge
5
a
′ of the circumferential surface
5
a,
and reciprocating the cutting tool
7
parallel to the central axis X synchronously with the reciprocal movement of the circumferential surface
5
a
parallel to the central axis X. As seen from
FIG. 2
, the blade
7
a
of the cutting tool
7
must be inclined relative to the central axis X in order to chamfer the acute-angled edge
5
a
′ of the circumferential surface
5
a
rotating around the central axis X with the cam plate
5
to form a cylindrical surface extending coaxially with the central axis X. The cutting tool
7
with its blade
7
a
inclined relative to the central axis X must be reciprocated synchronously with the reciprocal movement of the circumferential surface
5
a
in order to chamfer the acute-angled edge
5
a
′. Therefore, the conventional method for chamfering the cam plate of the swash plate compressor requires a special apparatus for reciprocating the cutting tool synchronously with the reciprocal movement of the circumferential surface of the cam plate.
As seen from
FIG. 2
, an acute-angled edge
5
a
′ is present at each side of the cam plate
5
. In the conventional method for chamfering, the chamfering of one of the acute-angled edges
5
a
′ of the circumferential surface
5
a
causes the chamfering of the obtuse-angled edge
5
a
″ connecting with the chamfered acute-angled edge
5
a
′ and not the chamfering of the other of the acute-angled edges
5
a
′. Therefore, the cutting tool
7
must be abutted against the acute-angled edge
5
a
′ at each side of of the central axis X and from opposite directions in order to chamfer the acute-angled edges
5
a
′ substantially over the whole length thereof. Thus, the conventional method for chamfering requires two chamfering operations.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for chamfering the cam plate of a swash plate compressor, wherein a special apparatus for reciprocating the cutting tool synchronously with the reciprocal movement of the circumferential surface of the cam plate is not required and a single chamfering operation can chamfer the acute-angled edges of the circumferential surface over substantially the whole length thereof.
In accordance with the present invention, there is provided a method for chamfering the cam plate of a swash plate compressor comprising a cylinder block provided with cylinder bores, pistons inserted into the cylinder bores to be slidable, a driving shaft, a cam plate slantedly fixed to the driving shaft and shoes inserted between the cam plate and pistons, wherein the circumferential surface of the cam plate forms a cylindrical surface extending coaxially with the driving shaft, comprising the steps of rotating the cam plate around an axis inclined relative to the driving shaft, disposing the blade of a cutting tool to extend parallel to the axis, and abutting the blade of the cutting tool against the edges of the circumferential surface of the cam plate.
In the chamfering method in accordance with the present invention, the cam plate rotates around an axis inclined relative to the driving shaft to incline the circumferential surface of the cam plate forming a cylindrical surface extending coaxially with the driving shaft relative to the axis. Therefore, the edges of the circumferential surface can be chamfered by the steps of disposing the blade of the cutting tool to extend parallel to the axis and abutting the blade against the edges of the circumferential surface. The blade of the cutting tool extends parallel to the axis. Therefore, on the sole condition that the blade of the cutting tool is sufficiently long, the blade of the cutting tool can be kept abutting against the edges of the reciprocating circumferential surface of the cam plate to chamfer the edges even if the cutting tool is fixed in the direction of the reciprocal movement of the circumferential surface of the cam plate. Therefore, the chamfering method in accordance with the present invention does not require a special apparatus for reciprocating~the cutting tool synchronously with the reciprocal movement of the circumferential surface of the cam plate.
In the present chamfering method, a single chamfering operation can chamfer the acute-angled edges of the circumferential surface of the cam plate substantially over their whole length because the blade of the cutting tool can always oppose the acute-angled edges of the circumferential surface of the cam plate.
REFERENCES:
patent: 3885481 (1975-05-01), Okada et al.
patent: 4177699 (1979-12-01), Dovnar et al.
patent: 4564914 (1986-01-01), Ballough et al.
patent: 4683785 (1987-08-01), Perraudin
patent: 4870786 (1989-10-01), Millay et al.
patent: 4901480 (1990-02-01), Dillon
Baker & Botts L.L.P.
Tsai Henry W. H.
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