US3379044A - Cleaning device for a rolling mill - Google Patents

Cleaning device for a rolling mill Download PDF

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Publication number
US3379044A
US3379044A US425578A US42557865A US3379044A US 3379044 A US3379044 A US 3379044A US 425578 A US425578 A US 425578A US 42557865 A US42557865 A US 42557865A US 3379044 A US3379044 A US 3379044A
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US
United States
Prior art keywords
fluid
cleaning
cleaning device
members
rotary brush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US425578A
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English (en)
Inventor
Kirschner Albert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaiser Aluminum and Chemical Corp
Original Assignee
Kaiser Aluminum and Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kaiser Aluminum and Chemical Corp filed Critical Kaiser Aluminum and Chemical Corp
Priority to US425578A priority Critical patent/US3379044A/en
Priority to GB530/66A priority patent/GB1092819A/en
Priority to FR45664A priority patent/FR1463503A/fr
Application granted granted Critical
Publication of US3379044A publication Critical patent/US3379044A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands

Definitions

  • This invention relates to rolling mills used to produce metal plates, sheets and the like and to improved means for cleaning the roll surfaces thereof. More particularly, this invention relates to an improved means for not only controlling the force exerted by the cleaning means on the roll surfaces, but also for effecting a more eflicient cleaning action by use of the said cleaning means.
  • FIGURE 1 is a side elevational view with parts thereof being shown in section of one stand of a rolling mill wherein an attachable rotating brush-type cleaning means incorporating the instant invention can be employed;
  • FIGURE 2 is an enlarged broken plan view taken generally along line 22 of FIGURE 1, with certain parts being removed, and illustrating further details of the apparatus of the instant invention;
  • FIGURE 3 is a sectional view taken generally along line 3-3 of FIGURE 2 with certain parts being added and other parts being shown in dotted lines;
  • FIGURE 4 is a perspective view on an enlarged scale of certain parts of the apparatus of the instant invention.
  • FIGURE 5 is another view in perspective on an enlarged scale of another part of the apparatus of the instant invention.
  • FIGURE 6 is a schematic illustration of a suitable hydraulic circuit that can be used to control the operation of the apparatus of the instant invention.
  • a preferred form of the improved apparatus that can be used in carrying out the teachings of the instant invention generally comprises a cleaning device 10 that can be aflixed in a suitable fashion to a roll stand 12 of conventional construction as shown in FIGURE 1.
  • the roll stand 12 is mounted in a suitable fashion to an appropriate base by the bolt means 14 and includes within its structure a pair of vertically aligned work rolls 16 which are disposed between a pair of back-up rolls 18 in a fashion conventional in the art.
  • the roll cleaning apparatus or device 10 of the instant invention associated with each work roll 16 generally comprises a pair of guide members 22 aflixed in a suitable fashion and in spaced relation to the main frame 11 of the roll stand 12. It is to be understood that the guide members 22 can be directly aflixed to the frame 11 of the roll stand 12 or they can be separately affixed to mounting plate (not shown) which in turn are directly aflixed in a suitable fashion to the frame 11 of the roll stand.
  • a rotatable brush means 24 The ends of a rotatable brush means 24 are journalled in a pair of brush supporting blocks or members 26 which in turn are interconnected in a novel manner to the associated guide member 22 for transverse and longitudinal reciprocal stroke movements with respect to the guide members 22 whereby the rotary brush means can effect more suflicient cleaning of rolls 16 during the removal of foreign material therefrom all as hereinafter described in further detail.
  • each guide member 22 includes a series of circular holes 28 that extend through opposed surfaces to facilitate mounting of the guide member 22 to the frame 11 of the roll stand 12 by mean of cap screws 30 and dowel pin 32.
  • a pair of parallel spaced flanges 34 and 36 are advantageously formed on the exposed surface of the guide member 22. These flanges generally extend from the side edge 48 and terminate intermediate the side edges of the guide members.
  • Opposed parallel surfaces 38 and 40 of the flanges 34 and 36 interconnected by a planar surface 42 project inwardly into the body of the member 22.
  • the interconnected surfaces 38, 40 and 42 define a recess 44 best shown in FIG.
  • the flange 34 in one of the members 22 includes a closed-end opening or slot 50, best illustrated in FIGURES 2 and 5.
  • the shape of this slot roughly approximates that of an ellipse.
  • the purpose of the slot 50 will become more apparent hereinafter.
  • the lower portion of the exposed surfaces of the guide members 22 below the flange 36 includes a substantially C-shaped flange 52 upon which a screw-type clamp 54 is mounted.
  • Clamp 54 is affixed to a conventional deflector 56 used with the cleaning device 10. This deflector blade 56 assists the rotary brush means 24 in cleaning the associated roll 18 especially during the processing of material between the rolls of the mill stand.
  • Each brush supporting member 26, as indicated in FIG. 4, is of generally rectangular shape such that it includes surfaces 69 and 62, 62a and 63, and 64 and 64a.
  • the surfaces 60, 62 and 64 of brush member 26 are adapted to slidably interengage the surfaces 38, 40 and 42 respectively that define the recess 44 of the associated guide member 22.
  • the member 26 includes a longitudinal bore 66 therethrough defined by the interior cylindrical surface 67 extending between the surfaces 64 and 64a.
  • the shaft ends 71 of the rotary brush means 24 are adapted to slidably fit into the bore 66 in the appropriate block 26.
  • the surface 67 of the bore 66 is modified to include a conventional keyway slot 68 that is alignable with the corresponding keyway slot 73 on the shaft end '71 to enable the mounted shaft end 71 to be aflixed to the supporting member 26 by the key 70 in a conventional fashion as illustrated in FIGURE 3.
  • the supporting members 26 and the affixed brush means 24 are then disposed to advantageously extend between the guide members 26 whereby each supporting member 22 is in interengagement with the recess 44 of the associated guide member 22 in such a fashion that the brush means 24 is advantageously movable in both a longitudinal and transverse direction.
  • the surface 62a includes parallel projections that define a U-shaped bracket 72 to which the free end of a piston rod 74 is connected in an appropriate manner.
  • the piston rod 74 constitutes part of an extensible fluid actuator 76 provided at its cylinder end with a U-shaped bracket '78 that is pivotally connected to the projection 80 on the guide member 22 adjacent the end edge 46 thereof.
  • the fluid actuator 76 can be extended or retracted to produce movement of the supporting members 22 and the rotary brush means 24 in a direction generally parallel to the longitudinal axis of the aflixed guide members 22.
  • each member 26 includes a pair of closed-end stepped bores 81 disposed radially outward in opposite directions from the longitudinal axis of the bore 66.
  • Each of the bores 81 is defined by a large cylindrical surface 82 extending from the surface 64 to the annular shoulder 84 and a small cylindrical surface 86 that extends from shoulder 84 to the closed end bottom surface 88 of the bore 81.
  • the two bores 81 are placed in open communication with each other by a series of fluid lines indicated at 90, 92 and 94 formed within the member 26.
  • a cylindrical piston 96 of conventional design is disposed within each bore 81.
  • This piston is adapted to slidably engage the cylindrical surface 82 while the exposed end surface 98 of the piston is adapted to abuttingly engage the recess surface 42 when the supporting members 26 are assembled to the guide members 22 in the manner indicated in FIGURE 2.
  • the control means for pistons 96 to be subsequently described is connected in a conventional fashion to one of the lines 90, 92 and 94 in each member 26 whereby fluid pressure can be exerted from the closed ends of the radially disposed bores 81 upon the inner end surface 100 of the pistons 96.
  • the longitudinal position of the rotary brush means 24 in FIGURE 2 corresponds to an intermediate position. If the control means directs a greater volume of pressure fluid to the radially outward disposed bores 81 in the left band member 26 a viewed in FIG. 2 with a corresponding removal of pressure fluid from the bores 81 in the right hand member 26 as viewed in FIG. 2 the rotary brush means 24 would be moved in a longitudinal direction to the right by the action of the piston surfaces 98 disposed in abutting engagement with the recess surfaces 42 of the guide members 22. Similarly if fluid under pressure is directed by the control means to the radially disposed bores 81 to increase the volume of fluid pressure therein the right hand supporting member 26 is viewed in FIG.
  • control means advantageously provides the improved cleaning device of the instant invention with relative reciprocal longitudinal and transverse stroke movements by virtue of the extensible fluid actuators 76 and the pistons 96.
  • pistons 96 are preferably disposed within the bores 81 provided in the supporting members 26, the pistons 96 could beneficially be disposed in corresponding bores, not shown, within the guide members 22 whereby the piston surface 98 would then abuttingly engage surface 64 of the associated supporting member 22 to effect longitudinal reciprocal stroke movements of the brush means 24.
  • apropriate motor means can be provided within the rotary brush means 24 for effecting rotation of the same on the shaft or spindle ends 71.
  • One appropriate motor means would be a suitable electric motor whereby the rotor would constitute an integral part of the outer cylindrical housing 102 upon which the brush is mounted while the stator would constitute an integral part of the intermediate portion of the shaft not shown which is affixed at its ends 71 to the supporting member 26 as aforedescribed.
  • one of the supporting members 26 is modified to include a radial keyway slot 104 that extends radially outward from the bore surface 67 to the surface 62a and extends axially inward from the surface 64a.
  • one of the shaft ends 71 is also modified to include an axial recess 75 that is alignable with the slot 104.
  • the aligned slot 104 and recess 75 enable the passage therethrough of the electrical conductors 106 whereby electrical connection to the motor (not shown) within the brush means 24 is advantageously maintained even though the associated guide and supporting members 22 and 26 can move in reciprocal longitudinal and transverse directions.
  • the hydraulic control circuit includes a pilot operated main control valve 108 which is supplied with a source of fluid under pressure by a pump means (not shown) through the main supply conduit 114 containing a series connected solenoid operated shut-offff valve and a pressure regulating valve 112.
  • a pilot control valve 116 is preferably mounted by means of an L-shaped bracket 118 in a suitable manner to the uppermost flange 34 of the guide member 22 associated with the supporting member 26 that provides the electrical connection.
  • FIGS. 1 a pilot operated main control valve 108 which is supplied with a source of fluid under pressure by a pump means (not shown) through the main supply conduit 114 containing a series connected solenoid operated shut-offff valve and a pressure regulating valve 112.
  • a commercially available pilot control valve 116 is preferably mounted by means of an L-shaped bracket 118 in a suitable manner to the uppermost flange 34 of the guide member 22 associated with the supporting member 26 that provides the electrical connection.
  • a trip pin 120 comprised of a shaft portion 123 extending between a base portion 122 at one end and a laterally projecting enlarged portion 124 at the other end is desirably employed to engage a collar 128 aflixed to the protruding shaft end of the pilot control valve 116.
  • the surface 60 of the supporting member 26 associated with the guide member 22 that has the pilot valve control element 116 aflixed thereto has been modified to include a groove 126 which extends lengthwise across the surface 60.
  • the groove 126 is defined by parallel surfaces 127, 127a extending inwardly from surface 60 to intersect the bottom surface 129 of the groove 126.
  • the base portion 122 of the pin 120 is arranged to slidably engage the groove 126 while the intermediate shaft portion 123 of the pin 120 is adapted to freely extend through the aforedescribed slot 50 of the flange 34 of the guide member 22 upon insertion of the enlarged end portion 124 through the slot 50. It is to be observed here that the groove 126 in the supporting member 26 and the slot 50 of the guide member 22 are disposed with their longitudinal axes in transverse relation to each other.
  • the trip pin 120 desirably functions to indicate to the control valve 116 the extent of the stroke movements made in either longitudinal direction by the brush means 24 while it permits transverse reciprocal movement of the brush means 24.
  • the apex end of the enlarged end portion 124 of the trip pin 120 angularly rotates the collar 128 of the pilot valve 116 in either direction corresponding to the extent of the longitudinal stroke movement made in either direction by the brush means 24.
  • Pilot control valve 116 is connected to the main supply conduit 114 by means of the branch line 114a while the conduits 130 and 132 interconnect the valve 116 with the ilot valves generally indicated at 134 and 136 associated with the main control valve 108 used to control the flow of fluid to the left or right pistons 96 by way of lines 138 and 140 all as indicated in FIG. 6. In the event any excess fluid is directed to the valves 108 and 116, this excess fluid is carried off by bypass lines 142 and 142;: and directed to the sump as shown. It the trip pin 120 indicates by its engagement with the collar 128 that the rotary brush means 24 has been extended fully to the right as indicated in FIG.
  • control valve 116 is automatically actuated whereby it will operate to direct fluid from its supply line 11411 to pilot valve line 132 tothereby direct fluid through lines 140 and 140a leading to the right hand piston (not shown so that fluid can act upon the right hand pistons 96 and at the same time release a corresponding amount of pressure fluid through the medium of lines 138 and 138a from the left hand pistons 96 as viewed in FIG. 6 to the sump through line 142.
  • the control valve 116 is automatically actuated whereby it will operate to direct fluid from its supply line 11411 to pilot valve line 132 tothereby direct fluid through lines 140 and 140a leading to the right hand piston (not shown so that fluid can act upon the right hand pistons 96 and at the same time release a corresponding amount of pressure fluid through the medium of lines 138 and 138a from the left hand pistons 96 as viewed in FIG. 6 to the sump through line 142.
  • the rotary brush means 24 is moved in a fully extended position to the left as viewed in FIG.
  • the trip pin 120 signals the control valve 116 to now direct pilot pressure fluid from line 132 to line 130 whereby fluid will be passed from line 140 to lines 138 and 138a the latter of which is connected to one of the left hand pistons 96 (not shown) and thereby increase the volume of pressure fluid acting against the left hand pistons 96 so as to shift the rotary brush means 24 in a similar fashion to the right.
  • the pilot control valve 116 in combination with the trip pin 1 20 advantageously enables the hydraulic circuit in FIG. 6 as aforedescribed to automatically effect longitudinal movement of the rotary brush means 24 in 0-pposite directions relative to the work roll with which it is associated.
  • a second hydraulic circuit is advantageously connected by means of the secondary source line 144 shown in dotted lines to the main source line 114. It is noted here that to indicate the pressure in the lines 114 and 144, a conventional pressure indicating device 146 is interconnected as shown.
  • the second hydraulic circuit includes a conventional manually operated control valve 148 that directs fluid under pressure and in equal amounts either to the free or to the rod end of the piston disposed within the actuators 76 by means of the interconnecting lines 150 and 150a or 152 and 152a as shown.
  • valve plunger 156 is actuated in a suitable fashion to direct the proper amount of fluid under pressure through lines 150 and 150a to the piston ends of the actuators 76 while a corresponding volume of fluid is exhausted from rod ends of the actuators 76 through lines 152 and 152a and control valve 148 to sump line 154.
  • pressure fluid is directed through lines 152 and 152a and exhausted through lines 150 and 150a by further actuation of the plunger 156 in the control valve. Consequently, the aforediscussed hydraulic circuit in FIG.
  • the outer periphery of the cylindrical portion 102 of the rotary brush means 24 has appropriate cleaning elements aflixed thereto in a suitable fashion and generally indicated at 156.
  • These cleaning elements can be made up of groups of radially extending bristles of a suitable material such as metal, plastic, fiber, etc., which act to remove any foreign material that may become adhered to the work contacting surface of the work rolls 16 as a result of roll pick-up.
  • One of the significant features of the apparatus 10 of the instant invention resides in the fact that the cleaning action of the brushing elements 156' is significantly enhanced by virtue of the ability of the rotary brush means 24 to be moved in a longitudinal direction or in path of travel which parallels the longitudinal axis of a work roll. If the rotary brush means 24 is merely moved transversely of the longitudinal axis of the work rolls and into pressure contact with the work rolls by the fluid actuators 76 as aforedescribed it has been found that the effective brushing action diminishes in proportion to the time of exposure or pressure contact between the forming surface of the work rolls 16 and the brush elements 156.
  • a cleaning device for said work roll comprising a pair of guide members affixed to the frame of the mill stand adjacent said work roll and in opposed spaced relation to each other, each of said guide members being provided with a pair of inwardly directed surfaces interconnected by an intermediate surface so as to define an open recess in one guide member disposed in opposed relation to a similar recess on the opposed guide member, a pair of supporting members each having an outer surface, cleaning means disposed between and aflixed to said supporting members, said supporting members being individually sldably disposed in said recesses with the respective outer and intermediate surfaces of each adjacent pair of guide and supporting members being in confronting relation such that the combined length of said supporting members and said cleaning means is less than the distance between the intermediate surfaces of the reparkeds of said guide members, piston-cylinder means disposed in the supporting members of each adjacent pair of supporting and guide members such that the outer ends of the pistons of said piston-cylinder means are in abutting engagement with the adjacent
  • a fluid operable control means connected to said pistoncylinder means for operating same, said control means being provided with a control valve having a trip pin associated therewith, said trip pin being disposed in operative relation to one of the associated guide and supporting members for efiecting automatic reversal in the stroke movement of said cleaning means in a direction generally parallel to the longitudinal axis of the Work roll.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
US425578A 1965-01-14 1965-01-14 Cleaning device for a rolling mill Expired - Lifetime US3379044A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US425578A US3379044A (en) 1965-01-14 1965-01-14 Cleaning device for a rolling mill
GB530/66A GB1092819A (en) 1965-01-14 1966-01-05 Improvements in or relating to rolling mills
FR45664A FR1463503A (fr) 1965-01-14 1966-01-12 Perfectionnements apportés aux dispositifs de nettoyage pour cylindres de laminoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US425578A US3379044A (en) 1965-01-14 1965-01-14 Cleaning device for a rolling mill

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US3379044A true US3379044A (en) 1968-04-23

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US425578A Expired - Lifetime US3379044A (en) 1965-01-14 1965-01-14 Cleaning device for a rolling mill

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US (1) US3379044A (fr)
FR (1) FR1463503A (fr)
GB (1) GB1092819A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603125A (en) * 1969-05-20 1971-09-07 Reynolds Metals Co Automatic control system for means for removing roll coating from a rolling mill work roll without removing the roll from the mill
US3604239A (en) * 1969-04-01 1971-09-14 Reynolds Metals Co Rolling mill and method of removing coating from a work roll of the mill
US4614293A (en) * 1984-06-22 1986-09-30 Cefin S.P.A. Shaping device for cylindrical containers for use with a continuous welder
US4653303A (en) * 1984-08-02 1987-03-31 Cegedur Societe De Transformation De L'aluminium Pechiney Apparatus for continuously brushing and lubricating rolls of rolling mills for flat rolled products
US5255549A (en) * 1992-06-10 1993-10-26 The Monarch Machine Tool Company Tension leveler roll cleaning system and method
US20060021408A1 (en) * 2004-07-28 2006-02-02 Hammar Richard H Hot die cleaning system for quick plastic forming cell
DE102012216708A1 (de) * 2012-09-19 2014-03-20 Sms Siemag Ag Verfahren zum Betreiben einer Bürstenanlage an einem Walzgerüst und Bürstenanlage
US20160114380A1 (en) * 2014-10-22 2016-04-28 Honda Motor Co., Ltd. Methods and systems for target cleaning die surfaces of a die of a press machine
US20160375474A1 (en) * 2015-06-26 2016-12-29 Danieli & C. Officine Meccaniche Spa Rolling stand and corresponding method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156507A (ja) * 1983-02-25 1984-09-05 Ishikawajima Harima Heavy Ind Co Ltd 圧延ロ−ルの研削装置
DE4203188C2 (de) * 1992-02-05 1994-11-24 Achenbach Buschhuetten Gmbh Vorrichtung zum Auffangen des in Kaltbandwalzwerken durch den Walzspalt und von der Walzenoberfläche abspritzenden Walzöls
FR2708218B1 (fr) * 1993-07-28 1995-10-20 Clecim Sa Dispositif de nettoyage d'un cylindre.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1500386A (en) * 1923-05-28 1924-07-08 Henry J Harris Roll grinding and polishing device
US1689656A (en) * 1926-04-06 1928-10-30 John D Williams Roll polisher
US2318504A (en) * 1938-12-09 1943-05-04 Frederick W Lodding Doctor operating mechanism for rolls and cylinders
US2953952A (en) * 1956-02-29 1960-09-27 Kaiser Aluminium Chem Corp Apparatus for cleaning rolls

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1500386A (en) * 1923-05-28 1924-07-08 Henry J Harris Roll grinding and polishing device
US1689656A (en) * 1926-04-06 1928-10-30 John D Williams Roll polisher
US2318504A (en) * 1938-12-09 1943-05-04 Frederick W Lodding Doctor operating mechanism for rolls and cylinders
US2953952A (en) * 1956-02-29 1960-09-27 Kaiser Aluminium Chem Corp Apparatus for cleaning rolls

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604239A (en) * 1969-04-01 1971-09-14 Reynolds Metals Co Rolling mill and method of removing coating from a work roll of the mill
US3603125A (en) * 1969-05-20 1971-09-07 Reynolds Metals Co Automatic control system for means for removing roll coating from a rolling mill work roll without removing the roll from the mill
US4614293A (en) * 1984-06-22 1986-09-30 Cefin S.P.A. Shaping device for cylindrical containers for use with a continuous welder
US4653303A (en) * 1984-08-02 1987-03-31 Cegedur Societe De Transformation De L'aluminium Pechiney Apparatus for continuously brushing and lubricating rolls of rolling mills for flat rolled products
US5255549A (en) * 1992-06-10 1993-10-26 The Monarch Machine Tool Company Tension leveler roll cleaning system and method
US7204110B2 (en) * 2004-07-28 2007-04-17 General Motors Corporation Hot die cleaning system for quick plastic forming cell
US20060021408A1 (en) * 2004-07-28 2006-02-02 Hammar Richard H Hot die cleaning system for quick plastic forming cell
DE102012216708A1 (de) * 2012-09-19 2014-03-20 Sms Siemag Ag Verfahren zum Betreiben einer Bürstenanlage an einem Walzgerüst und Bürstenanlage
DE102012216708B4 (de) * 2012-09-19 2017-10-19 Sms Group Gmbh Verfahren zum Betreiben einer Bürstenanlage an einem Walzgerüst und Bürstenanlage
US20160114380A1 (en) * 2014-10-22 2016-04-28 Honda Motor Co., Ltd. Methods and systems for target cleaning die surfaces of a die of a press machine
US9908154B2 (en) * 2014-10-22 2018-03-06 Honda Motor Co., Ltd. Methods and systems for target cleaning die surfaces of a die of a press machine
US20160375474A1 (en) * 2015-06-26 2016-12-29 Danieli & C. Officine Meccaniche Spa Rolling stand and corresponding method
EP3108977B1 (fr) 2015-06-26 2018-03-28 DANIELI & C. OFFICINE MECCANICHE S.p.A. Cage de laminoir et procédé correspondant
US10259026B2 (en) * 2015-06-26 2019-04-16 Danieli & C. Officine Meccaniche Spa Rolling stand and corresponding method

Also Published As

Publication number Publication date
GB1092819A (en) 1967-11-29
FR1463503A (fr) 1966-12-23

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