US3801293A - Method of machining ferromagnetic workpieces to true flatness - Google Patents

Method of machining ferromagnetic workpieces to true flatness Download PDF

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Publication number
US3801293A
US3801293A US00259444A US3801293DA US3801293A US 3801293 A US3801293 A US 3801293A US 00259444 A US00259444 A US 00259444A US 3801293D A US3801293D A US 3801293DA US 3801293 A US3801293 A US 3801293A
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United States
Prior art keywords
workpiece
belt
abrasive
stretch
magnetic attraction
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Expired - Lifetime
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US00259444A
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English (en)
Inventor
F Kiser
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Timesavers Inc
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Timesavers Inc
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Publication date
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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces

Definitions

  • zone of action where the belt contacts the workpiece extends across the workpiece like a diametrical stripe across a circular disc; and'because the workpiece rotates about an axis perpendicular to that zone, the workpiece surface at the center of its rotation is in contact with the abrasive belt throughoutthe entire operation, but all other areas of the workpiece surface move into and out of contact with the abrasive belt.
  • the workpieces are set onto that stretch of the 2 belt with the rough-ground surface down.- A magnet beneath the platten-supported stretch of the belt draws the workpiece against the abrasive belt, and a fence -across the belt restrains the thus placed workpiece against traveling with the belt. Itis of course understood that this operation requiresthat the workpieces be of ferrous metal.
  • a grinding'machine of the type employed herein for the finish grinding is disclosed in the Gardner US. Pat. No. 2,007,967, but the method of machining ferrous metal workpieces to true flatness by first rough grinding the same, allowing the workpieces to cool and then finishing their rough-ground surfaces by a fine grit endless belt on which they are placed and against which they are drawn by 'rnagnetic attraction is new.
  • the invention also has as one of its objects to improve the finish grinding machine so that despite its tendency to grind more aggressively at the upstream portion of the workpiece surface than its downstream portion with respect to the direction the abrasive belt travels the grinding action will be uniform across the entire area of the surface being ground.
  • FIG. 1 is a perspective view of the essential elements of one of the high production rough grinding machines illustrated in the Grivna et al. application, showing a workpiece being ground thereby;
  • FIG. 2 is a cross sectional view through the workpiece showing, greatly exaggerated, the dished shape of the ground surface after the workpiece has been allowed to cool; I t
  • FIG. 3 is a perspective view of the finish grinding ma- 'a workpiece being chine of this invention showing ground thereby;
  • FIG. 4 is a side view of the workpiece on the finish grinding machine illustrating in an exaggerated way the objectional uneven grinding that is done with such a forms part of this invention
  • FIG. 5 is a view like FIG. 4, but showing one embodiment of the improved machine of this invention.
  • FIG. 6 is a view similar to FIG. 5, showing another way of eliminating the uneven grinding depicted in FIG. 4.
  • the numeral 6 designates generally the rough grinding machine employed in the practice of this invention, and which is essentially one embodiment of the invention of the aforesaid Grivna et al. application.
  • the parts of the machine shown are its endless abrasive belt 7 which is trained over a contact drum 8 and an idler roll 9, and one of its turrets 10 to which the workpiece W is secured.
  • the contact drum which is power driven is firmly supported in bearings (not shown) to rotate about a horizontal axis, and the turret is mounted to rotate about a vertical axis that intersects that of the contact drum.
  • the turret By feed force producing means (not shown) the turret is moved radially towards the contact drum to press the workpiece against the convex drum supported portion of the abrasive belt with considerable force.
  • the grinding is done dry and in a very short time, during which the turret with the workpiece thereon makes only a few revolutions, the workpiece surface is rough ground to a predetermined level, but as explained hereinbefore the ground surface, when the workpiece has cooled, lacks true flatness. On the contrary it is slightly dished as shown in exaggeration in FIG. 2. Also, since the abrasive belt 7 has a course grit size in order to cut as rapidly as it does, the ground surface is not smooth.
  • the workpiece after being allowed to cool, is placed on the abrasive belt grinder illustrated in FIG. 3.
  • This grinder has a time grit endless abrasive belt 11 trained about horizontally spaced drums or-rolls 12 and 13, the latter being power driven in any suitable way.
  • the top stretch 14 of the abrasive belt which travels towards the driven drum 13 is horizontal and is supported against downward displacement by a platten l5 equipped with a smooth perfectly flat wear plate 16 across which the belt slides with its abrasive surface up.
  • a stop or fence 18 that extends transversely across the top stretch of the belt adjacent to the downstream edge of the magnet, restrains the workpiece against traveling with the belt. As the abrasive belt passes under the workpiece it soon grinds the bottom surface of the workpiece to a fin'e smooth finish that is perfectly flat.
  • the collective magnetic attraction produced by all of the electromagnets can be adjusted to accommodate different sized workpieces, by a master variable resistor 21, without disturbing the setting of the individual re-' the workpiece is restrained against upward displacement, and in fact-urged downward.
  • a master variable resistor 21 without disturbing the setting of the individual re-' the workpiece is restrained against upward displacement, and in fact-urged downward.
  • I claim 1 The method of machining a surface of a workpiece of ferromagnetic metal to true flatness, which comprises:
  • portion of the workpiece which is farthest downstream with reference to the direction said stretch of the abrasive belt travels, is drawn against the abrasive surface of the belt with greater-magnetic clamping force than other portions of the same workpiece.

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  • 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)
US00259444A 1972-06-05 1972-06-05 Method of machining ferromagnetic workpieces to true flatness Expired - Lifetime US3801293A (en)

Applications Claiming Priority (1)

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US25944472A 1972-06-05 1972-06-05

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US3801293A true US3801293A (en) 1974-04-02

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US (1) US3801293A (index.php)
JP (1) JPS5143914B2 (index.php)
CA (1) CA953917A (index.php)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4750297A (en) * 1981-12-23 1988-06-14 Anderson William J Grinding apparatus and method
US4931120A (en) * 1988-12-27 1990-06-05 Corning Incorporated Method of tapering end of capillary tube bore for optic fiber coupling
US5926938A (en) * 1996-06-29 1999-07-27 Harting Elektro-Optische Bauteile Gmbh & Co. Kg Method for working an electroformed magnetic metal sheet
US6059638A (en) * 1999-01-25 2000-05-09 Lucent Technologies Inc. Magnetic force carrier and ring for a polishing apparatus
US6234868B1 (en) * 1999-04-30 2001-05-22 Lucent Technologies Inc. Apparatus and method for conditioning a polishing pad
US6256860B1 (en) * 1997-05-28 2001-07-10 Showa Denko K. K. Process for fabricating a magnetic disk substrate
US6328632B1 (en) * 1999-08-31 2001-12-11 Micron Technology, Inc. Polishing pads and planarizing machines for mechanical and/or chemical-mechanical planarization of microelectronic substrate assemblies
US20080274679A1 (en) * 2007-05-04 2008-11-06 Lg Electronics Inc. Sheet metal finished by continuous hair-line on its plane and curved surface and apparatus and method for finishing by continuous hair-line on the same
US20110136412A1 (en) * 2007-12-21 2011-06-09 Darex, Llc Cutting tool sharpener
CN108032203A (zh) * 2017-11-30 2018-05-15 宁波江北森壹机械制造有限公司 一种抛光设备
CN108032144A (zh) * 2017-11-30 2018-05-15 宁波江北森壹机械制造有限公司 一种抛光设备的使用方法

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4750297A (en) * 1981-12-23 1988-06-14 Anderson William J Grinding apparatus and method
US4931120A (en) * 1988-12-27 1990-06-05 Corning Incorporated Method of tapering end of capillary tube bore for optic fiber coupling
US5926938A (en) * 1996-06-29 1999-07-27 Harting Elektro-Optische Bauteile Gmbh & Co. Kg Method for working an electroformed magnetic metal sheet
US6256860B1 (en) * 1997-05-28 2001-07-10 Showa Denko K. K. Process for fabricating a magnetic disk substrate
US6059638A (en) * 1999-01-25 2000-05-09 Lucent Technologies Inc. Magnetic force carrier and ring for a polishing apparatus
US6234868B1 (en) * 1999-04-30 2001-05-22 Lucent Technologies Inc. Apparatus and method for conditioning a polishing pad
US6620032B2 (en) * 1999-08-31 2003-09-16 Micron Technology, Inc. Polishing pads and planarizing machines for mechanical and/or chemical-mechanical planarization of microelectronic substrate assemblies
US6354919B2 (en) * 1999-08-31 2002-03-12 Micron Technology, Inc. Polishing pads and planarizing machines for mechanical and/or chemical-mechanical planarization of microelectronic substrate assemblies
US6328632B1 (en) * 1999-08-31 2001-12-11 Micron Technology, Inc. Polishing pads and planarizing machines for mechanical and/or chemical-mechanical planarization of microelectronic substrate assemblies
US20080274679A1 (en) * 2007-05-04 2008-11-06 Lg Electronics Inc. Sheet metal finished by continuous hair-line on its plane and curved surface and apparatus and method for finishing by continuous hair-line on the same
US8192253B2 (en) * 2007-05-04 2012-06-05 Lg Electronics Inc. Finishing apparatus
US20110136412A1 (en) * 2007-12-21 2011-06-09 Darex, Llc Cutting tool sharpener
US8696407B2 (en) 2007-12-21 2014-04-15 Darex, Llc Cutting tool sharpener
US9849556B2 (en) * 2007-12-21 2017-12-26 Darex, Llc Cutting tool sharpener
US9956662B2 (en) 2007-12-21 2018-05-01 Darex, Llc Cutting tool sharpener
US10124458B2 (en) 2007-12-21 2018-11-13 Darex, Llc Cutting tool sharpener
CN108032203A (zh) * 2017-11-30 2018-05-15 宁波江北森壹机械制造有限公司 一种抛光设备
CN108032144A (zh) * 2017-11-30 2018-05-15 宁波江北森壹机械制造有限公司 一种抛光设备的使用方法

Also Published As

Publication number Publication date
CA953917A (en) 1974-09-03
AU4646272A (en) 1974-03-14
JPS5143914B2 (index.php) 1976-11-25
JPS4956290A (index.php) 1974-05-31

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