FR2472961A1 - DEVIL FOR DEWAVING AND CHAFFINING THE HOLES OF A PERFORATED PLATE - Google Patents

Abstract

THE INVENTION RELATES TO A DEVICE FOR DEBURRING AND CHAMFRAINING THE HOLES OF A PERFORATED PLATE WHICH INCLUDES A SET OF HOLES OF ANY SHAPE WHICH ARE MADE DURING AN OPERATION LEAVING A RIM AND SHARP ANGLES ON THE EDGES OF THE HOLE. THE DEVICE INCLUDES A FIRST FIXED SUPPORT ON WHICH THE PLATE RESTS, A SECOND MOBILE SUPPORT IN A DIRECTION PARALLEL TO THE PLATE AND A MOBILE TROLLEY ON THE SECOND SUPPORT IN ANOTHER DIRECTION PARALLEL TO THE PLATE. THE DEVICE ALSO INCLUDES AT LEAST ONE ROTATING BRUSH MOUNTED ON THE TROLLEY AND MEANS OF MOVING THE BRUSH PERPENDICULAR TO THE PLATE, TOWARD THE INSIDE OF THE HOLES, WITH RETURN TO AN ORIGINAL POSITION, BY MOVING IN THE OTHER DIRECTION . THE MOVEMENTS OF THE BRUSH PERPENDICULAR TO THE PLATE ARE MADE FOR EACH OF THE BRUSH POSITIONS BETWEEN TWO MOVEMENTS PARALLEL TO THE PLATE. THE INVENTION APPLIES, IN PARTICULAR, TO THE DEBURRING AND CHANFREINING OF SPACER PLATES OF STEAM GENERATORS OF PRESSURIZED WATER REACTORS.

Description

The invention relates to a deburring and chamfering device

  holes in a perforated plate which has a set of drill holes

  any machined during an operation leaving a metal rim re-

  pushed and sharp angles on the edges of the hole, on at least one of the faces of the plate. In the manufacture of heat exchangers, in particular the steam generators of pressurized water nuclear power plants, it is necessary to produce large perforated plates for fixing and supporting the tubes in which circulates the exchange fluid supplying the water. heat for the vaporization of the water constituting the secondary fluid of the reactor. Steam generators of nuclear water reactors

  pressure are constituted by a large envelope of large size

  cylindrical interior with a bundle of tu-

  small-diameter tubes, which are tightly attached to a tubular plate with

  one of their ends, these tubes having a vertical path inside the steam generator casing over a great length and being

  folded with some curvature at their upper part.

  Primary water flows through these tubes, while secondary water

  introduced into the envelope of the steam generator vaporizes

  tact of the outer surface of the tubes, the vapor being then recovered

  by the secondary circuit of the reactor.

  The vertical parts of the tubes of the bundle must be

  held in position relative to each other, the transverse sections

  the tubes constituting regular networks in perpendicular planes

on the axis of the exchanger.

  To keep the tubes in position, a certain number of

  number of spacer plates arranged with a certain spacing according to the height of the heat exchanger, these spacer plates comprising

  holes in a network corresponding to the tube network.

  To allow circulation of the secondary fluid in the vertical direction and to avoid deposits of corrosive materials in the contact zones between the tubes and the spacer plates, it is necessary to provide holes of more or less complex shapes in the plates. spacers to ensure both the effective maintenance of the tube,

  the circulation of the secondary fluid and the entrainment of the impurities

  tible to be in this fluid.

  These holes of more or less complex shapes crossing

  Spacer plates from one side to the other are made by machining processes.

  such as drilling, boring or broaching. The holes thus machined have a repoussé metal rim and

  sharp corners on their edge so that it is necessary on the one hand

  bury and on the other hand to chamfer the edges of these holes.

  In the case of circular holes special strawberries are used which eliminate

  miners the burr and simultaneously realize a chamfer or a rounded connection. In the case of more complex holes, this method

  can be used and grinding should be done with a power tool.

  me special. So far, we have not managed to automate this operation, which is currently being carried out hole by hole by operators using

  portable machines of the type hand drill.

  This work is tedious and painful and deburring risk

  to be imperfect because this mechanical deburring entails the formation of a

  Secondary vane of small size. On the other hand, this operation is not very reproductive and we obtain holes whose edges have

  slightly different shapes. Finally, this operation is extremely costly

  because it requires very long execution times and

important tools.

  The object of the invention is to provide a device for deburring and chamfering the holes of a perforated plate which comprises a set of holes of any shape machined during an operation leaving a flange of metal repoussé and sharp angles on the edge of the holes, on at least one of the faces of the plate, this device making it possible to carry out the

  deburring and chamfering operations quickly and automatically.

  For this purpose, the device comprises - a first fixed support on which the plate rests during operation,

  a second mobile support by means of displacement means in a first

  first direction parallel to the plate in position on the fixed support.

  a second carriage movable on the second support by means of guiding means

  and moving in a second direction parallel to the plate, at least one brush having a rotation symmetry rotatably mounted on the carriage about its axis of symmetry arranged parallel to the plate and movable in a direction perpendicular to the plate, comprising 38 brushing fibers arranged perpendicular to the axis of symmetry; and means for moving the brush at a set speed and

  low amplitude in a direction perpendicular to the plate, towards the

  the holes, with a return to an original position by moving in the other direction, between two successive displacements of this brush.

to the puddle.

  In order to fully understand the invention we will now de-

  as a non-limitative example, a device that can be used to

  Villing and chamfering of spacer plates of a nuclear generator

pressurized water.

  FIG. 1 represents an elevational view of the device

the invention.

  FIG. 2 represents a view along A of FIG. 1.

  Figures 3 and 4 schematically show the mode

  of action of the brush on the edges of the holes of the plate.

  In Figures 1 and 2, we see the entire installation

  which comprises a fixed support 1 on which the plate comes to rest

  toise 2 on which deburring and chamfering is performed.

  The support 1 is fixed thanks to a support structure 4 on the fixed frame of the installation on which is also fixed a bridge of

  command 5 and a gateway 6 usable for repairs and maintenance.

your device.

  On the bridge 5 is arranged a control console 7 of the dis-

  positive. The support device 4 in slightly inclined position relative to the vertical also supports two devices 9 and 10 with rollers

  for supporting and rotating the spacer plate 2.

  Each of the roller support devices 9 and 10 comprises, as can be seen in FIG. 2, a geared motor 11 driving a

  roller 12 whose groove can receive the edge of the spacer plate 2.

  On the support 1 are also mounted, in its part coming into contact with the upper part of the spacer plate, rollers such as

  14, whose axis is slightly inclined with respect to the vertical,

  the same inclination as the support 1.

  In this way, the support and rotation devices

  9 and 10, when engines such as It are powered, may

  be the plate rotating around its axis of symmetry.

  38 The fixed frame of the installation also carries joists

  16 and 17 for supporting and guiding a mobile support 18

  naked in inclined position and parallel to the plate 2.

  Motor means allow the movement of the support 18

  the longitudinal direction of the installation between an ex-

  very represented in solid lines in FIG. 1 (18a off position) and an extreme position represented in mixed trains in FIG. 1

(18b, position in service).

  At the upper part of the mobile support 18 is arranged a

  20 driving a chain pulley on which passes a chain 21 which allows movement in the vertical direction of the carriage 22 constituted

  by a frame guided by the lateral uprights of the mobile support 18.

  In this way, on the one hand, the mobile support 18 moves in parallel.

  parallel to the perforated plate in position on the support 1 and on the other hand the carriage also moves parallel to the perforated plate 2 in

  a direction perpendicular to the direction of travel of the carriage 18.

  As can be seen in FIG. 2, the carriage 22 carries a motor 23 whose axis of rotation directed in the direction 25 is integral with a brush 24 having a symmetry of revolution about the axis 25 driven in rotation.

by the motor 23.

  As can be seen in FIGS. 3 and 4, the brush 24 comprises

  a set of brushing fibers 26 disposed on the body of the brush

  integral with the axis 25, perpendicular to this axis 25.

  On the other hand the motor 23 is movably mounted on the carriage 22 in a direction perpendicular on the one hand to the axis 25 and on the other hand to the plate 2. A device for moving the brush and its motor. drive in this direction makes it possible to move the holes of the perforated plate inwards, and then

  motor 23 power supply reaches a certain threshold, a blockage of-

  the whole operation of deburring and finally a displacement in the other

  sense with return to the original position.

  In this way it is possible to achieve a penetration

  of the tool constituted by the brush in the holes of the plate

drilled.

  Figure 3 shows the directions of the different displacements

  brushes 24 relative to the plate 2, the two translational movements parallel to the plate being caused firstly by the

  movement of the mobile support 18 and secondly by moving the chain

  38 riot 22 inside the mobile support. The rotation movement

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  (arrow 24a) is caused by the motor 23, while the penetration movement (fShe 24b) perpendicular to the plate is caused by the

  slave device on motor intensity 23.

  In FIG. 4, the brush is seen in the position of maximum penetration in a hole 34 of the perforated plate, the brush 24 having eliminated the burr present around the hole and caused the formation of a part

  rounded 30 on the edges of the hole 34.

  Metal particles detached from the current plate 2

  deburring are recovered by a vacuum cleaner 31 attached to the carriage 22 and followed by

  all movements of the brushing unit.

  A flexible electrical power supply device 32 allows tools to be fed regardless of their relative position.

fixed support.

  When it is desired to perform a deburring and

  chamfering on a spacer plate, the mobile support 18 is placed in position

  out of service 18a, for placing the perforated plate on the

  fixed support thanks to a handling means such as a traveling crane.

  When the plate 2 is put in position on the devices to

  rollers 9 and 10 at its lower part and on the rollers 14 at its upper part.

  the attachment means of the traveling crane can be unhooked.

  After retraction of the rollers 14, the plate 2 rests on the support 1 slightly

  inclined relative to the vertical.

  The carriage 22 is then brought into position opposite the zone of the plate 2 on which it is desired to start the deburring operation and by moving the carriage 22 along the longitudinal direction of the mobile support 18.

  performs a scan of the entire surface of an area of the plate 2.

  For each of the working positions of the brush 24, the

  motor 23 ensures the rotational drive, such penetration is achieved.

  the shown in Figure 4 which allows the elimination of the burr and the realization of a rounded chamfer on the edges of the hole and a return of the brush in a direction perpendicular to the plate to clear the hair

brush holes to work.

  When the complete sweep of the plate area has been completed,

  by moving the mobile support 18 and the carriage 22, the dis-

  rollers 9 and 10 to cause the plate to rotate

turn of its axis.

  For example, the brushing of an entire zone corresponding to

  38 to the upper half of the plate and then it causes a rotation of 900 of this plate to perform a new brushing operation on the area corresponding to the upper half-plate. When the plate underwent a rotational movement of 3600, each area of the plate underwent twice

the brushing operation.

  When this operation is completely finished, the

  in the out of service position corresponding to position 18a of the

  mobile port and we support the spacer plate on its support

thanks to the overhead crane.

  Cylindrical brushes with

  0.2 to 0.3 mm diameter steel bristles and with this tooling it was possible to eliminate

  burrs having a cross section of the order of 0.05 mm 2. It was also possible with this tooling chamfering or racking greater than 1 mm. The invention is not limited to the embodiment just described; on the contrary, it contains all the variants and it is possible to modify

  points of detail without departing from the scope of the invention.

  Thus, instead of a brush having steel bristles, it is possible to use a brush or a set of brushes with nylon bristles or other synthetic material containing abrasives or brushes of sisal or bristles. other natural fibers are plaited, with the addition of an abrasive

liquid or pasty.

  The embodiments of the different movements of the brush or of the brushing assembly that have been described are in no way limiting and other embodiments of the various displacements can be imagined.

  both parallel and perpendicular to the plate.

  In particular, instead of controlling the penetration of the brush into the holes of the plate at the intensity of the motor for rotating this brush, this penetration can be enslaved to the bearing pressure of the brushing assembly or a proximity measurement allowing

  to know the distance between the brushing assembly and the plate.

  These servocontrol devices make it possible to compensate for flatness defects of the plate as well as the wear of the brushes during operation. One can imagine a fixed support form receiving any plate, the main axis of this perforated plate can be, in

  during operation, both vertically and horizontally

  tale or in an inclined position. It can be imagined that the plate is placed in a fixed position on the support or that this plate can be moved in rotation or translation on the mobile support to present zones

  different to the brushing tool.

  Finally, the device according to the invention applies not only to

  and the chamfering of the spacer plates of steam generators such as the steam generators of pressurized water nuclear reactors, but also in the case of any large plate.

  with a network of more or less regular holes.

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Claims (5)

  1.- Device for deburring and chamfering the holes of a   perforated plate which comprises a set of holes of any shape   born during an operation leaving a metal rim pushed back and sharp angles on the edge of the holes, on at least one of the faces of the plate, characterized in that it comprises: - a first fixed support on which rests the plate during operation, - a second movable support by means of displacement means, in a first direction parallel to the plate in position on the fixed support, - a carriage movable on the second support by means of guiding and moving in a second direction parallel to the plate, - at least one brush having a rotational symmetry rotatably mounted on the carriage about its axis of symmetry arranged parallel to the plate and movable in a direction perpendicular to the plate, comprising brushing fibers arranged perpendicular to the axis of symmetry, and means for moving the brush with a small amplitude in a direction perpendicular to the axis of symmetry; the plate, towards the inside of the holes, with return to a position of origin, by displacement in the other direction,   between two successive displacements of this brush parallel to the plate.   2.- deburring and chamfering device according to the   characterized in that the first support carries a set of roller devices for supporting and rotating the plate relative to the fixed support.   3.- Deburring and chamfering device according to one   any of claims 1 and 2, characterized in that the brush   cylindrical shape has steel bristles.   4.- Deburring and chamfering device according to one   any of claims 1 and 2, characterized in that the brush   has bristles made of synthetic or natural fibers as associated with an abrasive.   5.- Deburring and chamfering device according to one   any of claims 1 to 4 characterized by the fact that   of the brush in the direction perpendicular to the plate is   vi to the intensity of the supply current of the rotating motor of this brush.