US3791083A - Apparatus for machining balls - Google Patents

Apparatus for machining balls Download PDF

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Publication number
US3791083A
US3791083A US00179694A US3791083DA US3791083A US 3791083 A US3791083 A US 3791083A US 00179694 A US00179694 A US 00179694A US 3791083D A US3791083D A US 3791083DA US 3791083 A US3791083 A US 3791083A
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US
United States
Prior art keywords
disc
balls
discs
stripper
working gap
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
US00179694A
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English (en)
Inventor
K Messerschmidt
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.)
MESSERSCHMIDT SPEZIALMASCHIN
MESSERSCHMIDT SPEZIALMASCHINEN
Original Assignee
MESSERSCHMIDT SPEZIALMASCHIN
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
Priority claimed from DE19702050662 external-priority patent/DE2050662C3/de
Application filed by MESSERSCHMIDT SPEZIALMASCHIN filed Critical MESSERSCHMIDT SPEZIALMASCHIN
Application granted granted Critical
Publication of US3791083A publication Critical patent/US3791083A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
    • B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
    • B24B11/04—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels
    • B24B11/06—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels acting by the front faces, e.g. of plane, grooved or bevelled shape

Definitions

  • ABSTRACT The specification describes a polishing or lapping machine for steel balls, comprising a stationary disc and a coaxial rotary disc between which the balls are rolled and lapped. The two discs are pressed together by a loading force which is so applied that its line of action intersects a base axis in a specific length of the base axis.
  • the base axis is defined as an axis intersecting the axis of the stationary disc perpendicularly passing through the center of gravity of the stationary disc and through a recess provided in the stationary disc for the introduction and removal of balls.
  • the specific range of the base axis in which the intersection with the line action of the loading force occurs is defined as the range beginning at the center of gravity of the station ary disc and extending away from the center of gravity and away from the recess.
  • the parts adjacent to the ends of the working gaps and adapted to feed balls into the working gap between the discs and receive them as they leave the gap are lined with a shock absorbing wear resistant material such as nylon.
  • the present invention relates to apparatus for machining balls, and more particularly to such apparatus for grinding and lapping of balls between a rotating disc and a stationary disc, which is provided with a sectorlike recess, into which a stripper extends on whose one side the balls, for example from a magazine, are introduced into the working gap between the discs and on the other side the machined balls are removed from the working gap, means being provided for exerting an axial pressure on the stationary disc.
  • the Prior Art Lapping machines of this type are known. Some machines operate with a vertical axis and some with a horizontal axis. However, apparatus with an oblique axis of the lapping discs is conventional.
  • the magazines used may be in the form of drums, elevators or, preferably, an annular magazine surrounding the lapping discs. This annular magazine rotates in a direction of movement opposite to the direction of the lapping disc and discharges the balls to be machined the one side of the stripper. After the balls have run through the working gap between the lapping discs, they are removed on the other side of the stripper by the magazine.
  • the point of engagement of the pressure on the stationary disc lies on an axis running through the center point and the recess in the disc at the position of the center of gravity of the stationary disc or, looking from the direction of the recess, lies outside this center of gravity and the surface loading acting on the balls located in the working gap firstly rises in a direction leading away from the ball inlet to a maximum and from this maximum continuously decreases towards the ball outlet.
  • the curve of area or surface area loading can be symmetrically curved but it is also possible for it to have a straight line part in its central zone, corresponding to the maximum surface area loading.
  • the distance by which the point of engagement of the pressing force must be placed beyond the center of gravity of the stationary disc provided with the sectorshaped recess depends upon the size of the respective recess and the diameter of the disc.
  • a further measure, which serves in a similar manner for attaining the purpose of the invention resides in that the ball inlet on the one hand of the stripper and the ball outlet on the other side of it are lined with a shock absorbing wear resistant material. This feature in itself leads to a more gentle treatment of the balls at the inlet and the outlet, that is to say in zones where the balls often pile up and consequently may strike against one another.
  • a material which has been found particularly suitable for the lining is polyamide or another material with similar properties.
  • the lining of the wall which lies foremost in turns of the direction of rotation of the rotating disc, of the ball inlet and the ball outlet comprise shoes covering the respective disc, and between the free end of the respective shoe and the lining of the respective rear wall an inlet or outlet gap for the balls is arranged.
  • in the upper cover forming the inlet and the outlet gap, of the lining guide grooves are arranged in an array, corresponding to the grooves of the discs. Owing to this the balls are introduced as planned into the working gap between the two discs, so that they pass directly into the grooves of the working gap.
  • the inlet gap and the outlet gap are both arranged as an acute angle between the discs and with the apex of the angle directed against the direction of rotation of the rotating disc. Owing to this in the ball inlet the balls roll against the direction of movement of the rotating disc into the working gap, but this rolling down movement of the balls corresponds to their rolling movement in the working gap between the two discs. There is therefore no forced reversal of movement, which afterwards leads to an excessively strong grinding action on the surface of the balls.
  • the outlet gap runs in the direction of movement of the disc and thus in the direction of movement of the balls so as to rise slightly onto the shoe covering the disc in the ball outlet.
  • the shoe of the ball inlet has grooves on its underside in array corresponding to the grooves of the discs for the passage of the balls introduced. This is in accordance with the further feature that the balls are guided by the guide grooves of the entry gap directly into the grooves of the working gap between the discs.
  • the shoe of the lining of the ball outlet has fingers fitting into the grooves at the free end of the shoe. These fingers pass underneath the balls which arrive and move them gently out of the grooves and the ball outlet.
  • the lining having the shoe, of the ball inlet can be caused to vibrate or oscillate in a direction perpendicular to the direction of rotation of the disc by means of a suitable oscillating drive, for example a bob-weight or eccentric drive to an oscillating magnet.
  • a suitable oscillating drive for example a bob-weight or eccentric drive to an oscillating magnet.
  • FIG. 1 shows a grinding an lapping device diagrammatically and in axial section.
  • FIG. 2 is a plan view of the two discs and the magazine of the apparatus in accordance with FIG. 1.
  • FIGS. 3, 4 and 5 show three graphs of the area loading in the case of various points of engagement of the pressure.
  • FIG. 6 is a section through the ball inlet and outlet generally on the line VIVI of FIG. 7.
  • FIG. 7 is a section through the ball inlet and outlet generally on the line VIIVII of FIG. 6.
  • FIG. 8 is a section through the ball inlet generally on the line VlII-VIII.
  • FIG. 9 is a section through the ball outlet generally on the line IX--IX, both in FIG. 7.
  • the lapping discs that is to say the rotating lower disc 1 and the stationary upper disc 2 are arranged with a vertical axis.
  • the lower disc 1 is carried by a support plate 3 which is fixed to the shaft 4 driven via a bevel gearing 5 and the V-belt drive 6 by the electric motor 7.
  • the upper disc 2 is fixed to the support plate 8.
  • pressure springs 10 are arranged in a circular arrangement, which transfer the pressure, exerted by the piston rod 11 of the pressure motor 12 to the upper disc 2.
  • the two concentrically arranged lapping discs 1, 2 are surrounded by an annular magazine 13 in an eccentric arrangement.
  • the magazine is driven by the motor 14, whose drive pinion 15 meshes with the gearing 16 on the lower side of the magazine 13.
  • the direction of movement 17 of the rotating magazine 13 is opposite to the direction of movement 18 of the rotating disc 1.
  • the upper disc 2 has a sector-like recess 19, which in the case of the embodiment of the invention shown defines an angle of approximately 45. This angle can, however, be larger or smaller without having any influence on the invention.
  • this recess 19 which serves for the introduction and removal of balls, the center of gravity 20 of the upper disc 2 is displaced on the axis 26, determined by the recess 19 and the center point 21 of the discs 1 and 2, by the distance x. If the center of the pressure acting on the upper disc 2 were to lie in the center point 21 of the disc, the pressure diagram or graph in accordance with FIG. 3 would result.
  • this stripper passes the balls 25 on the one side into the ball inlet 23 and on its other side passes them out of the ball outlet 24.
  • the ball inlet 23 and the ball outlet 24 are provided with a lining 33, 34, 35, 36 of shock absorbing and wear resistant material such as polyarnide, both on the side of the stripper 30 and also on the side of the side walls 32 of the stationary disc 2.
  • the linings 33,35 which in terms of the direction of rotation 18 of the lapping disc 1 lie to the front are provided with a shoe 37 and 38 respectively which covers the bottom of the ball inlet 23 and the ball outlet 24 and together with a lining 34 and 36 respectively lying to the rear forms an inlet gap 39 and an outlet gap 40 respectively for the balls.
  • a shoe 37 and 38 respectively which covers the bottom of the ball inlet 23 and the ball outlet 24 and together with a lining 34 and 36 respectively lying to the rear forms an inlet gap 39 and an outlet gap 40 respectively for the balls.
  • guide grooves 41 and 42 respectively are provided in the respective upper cover forming the inlet and outlet gap 39 and 40 respectively are provided.
  • These grooves have an arrangement corresponding to that of the grooves 43 of the rotating disc 1 and of the stationary disc 2 respectively.
  • grooves 45 are provided through the passage of balls 25 introduced into the working gap 22.
  • the introduction of the balls 25 is thus carried out in a very gentle manner.
  • the outlet gap 40 there is an unhindered exit of the balls in a direction of movement. In this respect of the removal of the machined balls 25 is aided by fingers 48 arranged on the free end of the shoe 38. These fingers fit into the grooves 43 of the rotating disc 1 and lift the balls out of them.
  • a particular form of the embodiment, in accordance with FIGS. 6 and 7, incorporates an oscillating drive 49 arranged to act upon the lining 33, of the ball inlet 23, arranged on the shoe 37.
  • This oscillatory drive can for example be a bob-weight or eccentric drive or incorporate an oscillating magnet, which brings about movement of the lining 33 and, more especially, its shoe 37 so that the balls entering in a direction of the arrow 50 from the magazine 13 into the ball inlet 23 are transported as far as the outer end 51 of the small inlet 23 so that an even loading of the grooves 43, 45 of the working gap 22 between the discs 1 and 2 is ensured.
  • a stationary disc generally coaxial to the rotary disc and having a sector-like recess, the two discs defining therebetween a working gap
  • the improvement which resides in that the abovementioned line of action intersects the base axis at a point lying at a predetermined distance from the common axis, said distance from the common axis extending along the base axis from the center of gravity of the stationary disc in a direction away from the center of gravity and from the recess .so that the pressure exerted on the balls is such that it increases from a minimum value at their point of entry into the working gap between the discs to a maximum value and then decreasing again to a low value at the outlet side of the stripper.
  • the apparatus of claim 1 further comprising a lining of a wear resistant, impact absorbing plastic material on the inlet side of the stripper for holding the balls before they pass into the working gap between the discs, and a lining of wear resistant, impact absorbing plastic material on the outlet side of the stripper for receiving balls from the working gap.
  • a stationary disc generally coaxial to the rotary disc and having a sector-like recess, the two discs defining therebetween a working gap
  • the apparatus comprises a lining of a wear resistant, impact absorbing plastic material on the inlet side of the stripper for holding the balls before they pass into the working gap between the discs, and a lining of wear resistant, impact absorbing plastic material on the outlet side of the stripper for receiving balls from the working gap,
  • the above-mentioned line of action intersects the base axis at a point lying at a predetermined distance from the common axis, said distance from the common axis extending along the base axis from the center of gravity of the stationary disc in a direction away from the center of gravity and shoes forming part of the respective linings and extending over the surface of the rotary disc, the shoes having free ends adjacent to further parts of the linings which define entry and outlet gaps for the balls.
  • An apparatus for machining balls in continuous operation comprising in combination:
  • first and a second disc disposed in coaxial super imposition spaced apart to define a working gap therebetween, the first disc being rotatably mounted, and the second disc being rotatably stationary but axially displaceable towards the first disc,
  • the center of gravity of the second disc being eccentrically disposed with reference to the center axis of said second disc and the pressure being applied to the second disc at a point along a line joining the center of gravity of the second disc and the geometric center of said second disc, said point being eccentric by a distance such that the working pressure exerted by the second disc upon the balls in the working gap increases from a minimum pressure at the inlet means to a maximum pressure intermediate the inlet and the outlet means and decreases from said maximum pressure to a minimum pressure at said outlet means.
  • said second disc includes a sector shaped recess, said inlet and outlet means being located in said recess.
  • said pressure means includes spring means and a pressure plunger, said spring means transmitting the pressure exerted by the plunger to the second disc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
US00179694A 1970-10-15 1971-09-13 Apparatus for machining balls Expired - Lifetime US3791083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702050662 DE2050662C3 (de) 1970-10-15 Maschine zum Schleifen oder Läppen von Kugeln

Publications (1)

Publication Number Publication Date
US3791083A true US3791083A (en) 1974-02-12

Family

ID=5785220

Family Applications (1)

Application Number Title Priority Date Filing Date
US00179694A Expired - Lifetime US3791083A (en) 1970-10-15 1971-09-13 Apparatus for machining balls

Country Status (16)

Country Link
US (1) US3791083A (en:Method)
JP (1) JPS5118116B1 (en:Method)
AT (1) AT303560B (en:Method)
BG (1) BG17721A3 (en:Method)
CA (1) CA932963A (en:Method)
CH (1) CH534033A (en:Method)
ES (1) ES390325A1 (en:Method)
FR (1) FR2109592A5 (en:Method)
GB (1) GB1313465A (en:Method)
HU (1) HU164088B (en:Method)
PL (1) PL70959B1 (en:Method)
RO (1) RO59152A (en:Method)
SE (2) SE389823B (en:Method)
SU (1) SU467515A3 (en:Method)
YU (1) YU33618B (en:Method)
ZA (1) ZA713656B (en:Method)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069621A (en) * 1976-06-17 1978-01-24 Intreprinderea "Mecanica" Plopeni Apparatus for machining bearing rolls
US4457064A (en) * 1981-06-13 1984-07-03 Kernforschungsanlage Julich Gmbh Apparatus for grinding off the outer shell of a spherical body
US5214884A (en) * 1991-04-23 1993-06-01 Kabushiki Kaisha Toshiba Ball polishing apparatus and method for the same
US5520573A (en) * 1994-05-20 1996-05-28 Nsk Ltd. Spherical member polishing apparatus
WO1999015312A1 (en) * 1997-09-19 1999-04-01 Speedfam Corporation Polishing machine including a platform assembly mounted on three columns
US5905936A (en) * 1997-08-06 1999-05-18 Teledyne Wah Chang Method and apparatus for shaping spheres and process for sintering
US6110023A (en) * 1998-04-02 2000-08-29 Nsk Ltd. Sphere grinding apparatus
US20020141677A1 (en) * 2001-03-12 2002-10-03 Nsk Ltd. Rolling elements for rolling bearing, method of producing the same, and rolling bearing
WO2004004971A3 (de) * 2002-07-03 2004-06-24 Schott Glas Läppverfahren und läppmaschine für glaskugeln

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404494A1 (fr) * 1977-09-29 1979-04-27 Mecanica Plopeni Intreprindere Machine a travailler les billes de roulements
HUT47878A (en) * 1987-05-08 1989-04-28 Magyar Goerdueloecsapagy Mueve Ball lapping machine for fine surfacing bearing balls
CN109551334B (zh) * 2018-11-24 2020-10-16 绍兴市上虞叶华实业有限公司 一种精研机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944375A (en) * 1956-10-26 1960-07-12 Lipkins Morton Lapping machine
US3250042A (en) * 1963-05-31 1966-05-10 Messerschmidt Sebastian Device for lapping and grinding balls

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944375A (en) * 1956-10-26 1960-07-12 Lipkins Morton Lapping machine
US3250042A (en) * 1963-05-31 1966-05-10 Messerschmidt Sebastian Device for lapping and grinding balls

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069621A (en) * 1976-06-17 1978-01-24 Intreprinderea "Mecanica" Plopeni Apparatus for machining bearing rolls
US4457064A (en) * 1981-06-13 1984-07-03 Kernforschungsanlage Julich Gmbh Apparatus for grinding off the outer shell of a spherical body
US5214884A (en) * 1991-04-23 1993-06-01 Kabushiki Kaisha Toshiba Ball polishing apparatus and method for the same
US5520573A (en) * 1994-05-20 1996-05-28 Nsk Ltd. Spherical member polishing apparatus
US5905936A (en) * 1997-08-06 1999-05-18 Teledyne Wah Chang Method and apparatus for shaping spheres and process for sintering
US5957763A (en) * 1997-09-19 1999-09-28 Speedfam Corporation Polishing apparatus with support columns supporting multiple platform members
WO1999015312A1 (en) * 1997-09-19 1999-04-01 Speedfam Corporation Polishing machine including a platform assembly mounted on three columns
US6001005A (en) * 1997-09-19 1999-12-14 Speedfam Corporation Polishing apparatus
GB2344545A (en) * 1997-09-19 2000-06-14 Speedfam Corp Polishing machine including a platform assembly mounted on three columns
US6110023A (en) * 1998-04-02 2000-08-29 Nsk Ltd. Sphere grinding apparatus
US20020141677A1 (en) * 2001-03-12 2002-10-03 Nsk Ltd. Rolling elements for rolling bearing, method of producing the same, and rolling bearing
US6752696B2 (en) * 2001-03-12 2004-06-22 Nsk Ltd. Rolling elements for rolling bearing, method of producing the same, and rolling bearing
WO2004004971A3 (de) * 2002-07-03 2004-06-24 Schott Glas Läppverfahren und läppmaschine für glaskugeln

Also Published As

Publication number Publication date
YU33618B (en) 1977-10-31
SU467515A3 (ru) 1975-04-15
HU164088B (en:Method) 1973-12-28
PL70959B1 (en:Method) 1974-04-30
GB1313465A (en) 1973-04-11
JPS5118116B1 (en:Method) 1976-06-07
DE2050662B2 (de) 1977-05-26
AU3242371A (en) 1973-02-22
SE389823B (sv) 1976-11-22
AT303560B (de) 1972-11-27
ES390325A1 (es) 1973-06-01
FR2109592A5 (en:Method) 1972-05-26
CA932963A (en) 1973-09-04
SE386614B (sv) 1976-08-16
CH534033A (de) 1973-02-28
BG17721A3 (bg) 1973-12-25
DE2050662A1 (de) 1972-04-20
ZA713656B (en) 1972-01-26
RO59152A (en:Method) 1977-01-15

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