Method of abrading both faces of work piece
First Claim
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1. A method for abrading both faces of a work piece in an abrasive machine including:
- a rotatable lower abrasive plate;
a rotatable upper abrasive plate being provided to face said lower abrasive plate so as to clamp the work piece with said lower abrasive plate;
a cylinder unit having pressure chamber and a rod from which said upper abrasive plate is suspended, said cylinder unit moving said upper abrasive plate in a vertical direction; and
said method comprising;
varying the pressure in said pressure chamber to provide different pressures for different abrading process, said step of varying the pressure in said pressure chamber comprising the steps of;
adjusting the pressure of said pressure chamber of said cylinder unit in a first abrading process so as to apply a first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate; and
readjusting the pressure of said pressure chamber in a second abrading process so as to apply a second pressure which is higher than the first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate.
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Abstract
Method for abrading a work piece with a fixed load including a first abrading process in which pressure of a cylinder chamber of a cylinder unit suspending an upper abrasive plate is adjusted in order to apply first pressure to the work piece via the upper abrasive plate without applying the full weight of the upper abrasive plate and a second abrading process in which the pressure of the cylinder chamber is readjusted in order to to apply second pressure which is higher than the first pressure to the work piece via the upper abrasive plate without applying the full weight of the upper abrasive plate.
40 Citations
11 Claims
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1. A method for abrading both faces of a work piece in an abrasive machine including:
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a rotatable lower abrasive plate;
a rotatable upper abrasive plate being provided to face said lower abrasive plate so as to clamp the work piece with said lower abrasive plate;
a cylinder unit having pressure chamber and a rod from which said upper abrasive plate is suspended, said cylinder unit moving said upper abrasive plate in a vertical direction; and
said method comprising;
varying the pressure in said pressure chamber to provide different pressures for different abrading process, said step of varying the pressure in said pressure chamber comprising the steps of;
adjusting the pressure of said pressure chamber of said cylinder unit in a first abrading process so as to apply a first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate; and
readjusting the pressure of said pressure chamber in a second abrading process so as to apply a second pressure which is higher than the first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
fixing a holding disk to the rod of said cylinder unit, coupling a plurality of connecting rods to said holding disk, and fixing said upper abrasive plate to said connecting rods. -
5. The method according to claim 1, wherein said first abrading process and said second abrading process comprise the steps of:
-
calculating a constant “
A”
, on the basis of;
a formula “
W=−
A·
P+B”
(wherein B is weight of said upper abrasive plate, P is total pressure of said pressure chamber of said cylinder unit, A is a proportional constant relating to frictional loss, W is actual load applied from said upper abrasive plate);
a known weight “
B1”
of said upper abrasive plate;
a measured actual load “
W1”
applied from said upper abrasive plate when an optional load is applied to said upper abrasive plate; and
a measured total pressure “
P1”
of said pressure chamber;
calculating a value “
P2”
which satisfies a formula “
W2=−
A·
P2+B1”
(wherein W2 is a set actual load applied from said upper abrasive plate while abrading);
monitoring the pressure in said pressure chamber; and
adjusting the total pressure in said pressure chamber to the value “
P2”
, andwherein said first abrading process and said second abrading process of a subsequent abrading of another work piece comprise the steps of;
calculating a value “
B1”
(=A·
PX) of a balanced state on the basis of the value “
W”
(=0) and a measured total pressure “
PX”
of said pressure chamber;
replacing the value “
B1”
with the value “
PX”
; and
calculating a value P3 which satisfies a formula of “
W3=−
A·
P3+B1”
(wherein W3 is a set actual load applied from said upper abrasive plate while abrading);
monitoring the pressure in said pressure chamber; and
adjusting the total pressure in said pressure chamber to the value “
P3”
.
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6. The method according to claim 1, wherein said abrasive machine has a mechanism for applying pressure to said pressure chamber of said cylinder unit;
- and said mechanism comprises;
a pressure source;
a pressure control valve provided between said pressure source and said pressure chamber of said cylinder unit;
a pressure sensor for measuring the pressure of said pressure chamber of said cylinder unit; and
a sequencer for controlling valve opening of said pressure control valve based on the pressure measured by said pressure sensor.
- and said mechanism comprises;
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7. The method according to claim 1, wherein the step of varying the pressure in said pressure chamber further comprises the steps of:
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arranging a pressure control valve between a pressure source and said pressure chamber of said cylinder unit;
measuring the pressure of said pressure chamber of said cylinder unit; and
controlling said pressure control valve based on the pressure measured by said pressure sensor to thereby increase or decrease in the pressure in said pressure chamber.
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8. The method according to claim 7, wherein the step of varying the pressure in said pressure chamber further comprises the step of directing the measured pressure of said pressure chamber of said cylinder unit to a sequencer, said pressure control valve being controlled by said sequencer.
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9. The method according to claim 1, further comprising the step of arranging an additional chamber in said cylinder unit on an opposite side of said rod, said additional chamber communicating with surrounding air.
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10. The method according to claim 1, wherein the step of varying the pressure in said pressure chamber further comprises the steps of:
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connecting a pipe between said pressure chamber of said cylinder unit and a pressure source;
arranging a pressure control valve in connection with said pipe;
measuring the pressure of said pressure chamber of said cylinder unit by measuring pressure in said pipe proximate said pressure chamber; and
controlling said pressure control valve based on the pressure measured by said pressure sensor to thereby increase or decrease in the pressure in said pressure chamber.
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11. The method according to claim 1, further comprising
fixing a holding disk to the rod of said cylinder unit, coupling a plurality of connecting rods to said holding disk, and fixing said upper abrasive plate in engagement with said connecting rods.
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Specification
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Current AssigneeFujikoshi Machinery Corp.
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Original AssigneeFujikoshi Machinery Corp.
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InventorsHasegawa, Tsuyoshi, Moriya, Norihiko, Kajikura, Atsushi, Miyashita, Tadakazu
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Primary Examiner(s)Hail, III, Joseph J.
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Assistant Examiner(s)OJINI, EZIAMARA ANTHONY
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Application NumberUS10/037,742Publication NumberTime in Patent Office739 DaysField of Search451/41, 451/261, 451/262-269, 451/285, 451/287, 451/288, 451/290, 451/340-343US Class Current451/41CPC Class CodesB24B 37/042 operating processes thereforB24B 37/08 for double side lappingB24B 49/16 taking regard of the loadB24B 51/00 Arrangements for automatic ...
