US3855739A - Device for grinding curved surfaces - Google Patents

Device for grinding curved surfaces Download PDF

Info

Publication number
US3855739A
US3855739A US00303391A US30339172A US3855739A US 3855739 A US3855739 A US 3855739A US 00303391 A US00303391 A US 00303391A US 30339172 A US30339172 A US 30339172A US 3855739 A US3855739 A US 3855739A
Authority
US
United States
Prior art keywords
workpiece
grinding
frame
curvature
radius
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
US00303391A
Other languages
English (en)
Inventor
Der Meer J Van
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3855739A publication Critical patent/US3855739A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/26—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding workpieces with arcuate surfaces, e.g. parts of car bodies, bumpers or magnetic recording heads
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
    • B24B47/04—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by mechanical gearing only
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor

Definitions

  • the invention relates to a device suitable for use with a grinding machine for grinding articles having curvatures.
  • the grinding machine has a drivable and rotatable grinding wheel and a clamping table, the grinding wheel and the clamping table are movable relative to each other in three mutually perpendicular directions.
  • a profile grinding machine For grinding round corners on a workpiece it is known to use a profile grinding machine.
  • a sensor moves along a template and the movement of the sensor is transmitted to the grinding wheel which grinds the curvature.
  • Another known method is to clamp the workpiece between two rotatable centres which are arranged on the clamping table of a surface grinding machine.
  • the end faces of the workpiece must first be pre-machined and be pre-drilled for the centres which have to engage accurately in the axis of the curvature.
  • Still another method is to use a profiled wheel which has the desirable curvature.
  • the manufacture and the use of such a wheel is expensive and a differently curved wheel should be in stock for each individual curvature.
  • the device according to the invention is characterized in that it comprises a frame which can be secured to the clamping table of a grinding machine.
  • a clamping table for the workpiece is suspended in the frame by two adjustable eccentrics which are journalled in the frame so as to be rotatable in the frame and rotatable in the table.
  • the value of the eccentricity of the eccentrics is adjustable so as to correspond to the radius of the curvature to be machined. If desirable, the eccentricity can be increased for convex curvatures and decreased for concave curvatures by the radius of curvature of the part of the grinding wheel which contacts the workpiece. Any point of the clamping table and the workpiece secured thereto will perform a circular movement in its plane at right angles to the axis of rotation of the eccentrics the radius of which corresponds to the radius of the curvature.
  • the device according to the invention may be used in combination with, for example, a surface grinding machine. This has the great advantage that it is not necessary to buy a separate grinding machine for grinding curvatures. It is not necessary either to use special grinding wheels. Furthermore, the device according to the invention is simple to operate and is of a comparatively inexpensive construction.
  • a further embodiment of the device according to the invention is characterized in that the further clamping table comprises at least one guide groove extending at right angles to its surface, said groove incorporating with ample fit a guide element which is rotatably journalled in a slide which is movable along a guide which extends transversely to the journal axis of the eccentrics in the frame and is connected to the frame.
  • each of the eccentrics in a further favourable embodiment is coupled to a driving mechanism.
  • the value of the eccentricity of the eccentrics in a further favourable embodiment is differently adjustable.
  • FIGS. 1 to 4 show in what manner the workpiece is to be moved along the grinding wheel when a curvature is ground
  • FIG. 5 shows how the desirable movement can be obtained in principle.
  • FIG. 6 shows a workpiece with a spatially reliefground curvature
  • FIGS. 7 and 8 are a partly broken away perspective view and a sectional view, respectively, of a structural embodiment of the device according to the invention.
  • Reference numeral 1 in FIG. 1 denotes a grinding wheel which is rotatable about its axis 2.
  • the workpiece to be ground is denoted by reference numeral 3.
  • Said workpiece has a curvature 4 of radius R.
  • the curvature 4 has rolled off along the edge 8 of the grinding wheel 1, the whole workpiece being moved without its position in the horizontal and vertical directions varying.
  • Each point of the workpiece has traversed an arc of a circle the radius of which corresponds to that of the curvature 4.
  • the point 9 centre of the curvature 4) traverses the arc of a circle 10 to position 9'.
  • FIG. 2 shows how a workpiece 3 with concave curvature 4 rolls off along the edge 8 of the grinding wheel.
  • each point of the workpiece performs a circular movement having a radius equal to that of the curvature, in which the workpiece is again transported in the horizontal and vertical directions, which means that the position of the workpiece is always the same.
  • the grinding wheel has a sharp edge 8.
  • said edge 8 will often be more or less rounded.
  • any point of the workpiece should move along an arc of a circle the radius of which corresponds to the radius R of the curvature increased by the radius r of the curvature of the edge 8 of the grinding wheel.
  • FIG. 3 shows diagrammatically, that in the case of a concave curvature the radius of the circular movement of any point of the workpiece should correspond to the radius R of the curvature of the workpiece decreased by the radius r of the curvature of the edge 8 of the grinding wheel. It is achieved in this manner that in spite of the curvature of the grinding wheel the workpiece rolls off accurately along the grinding wheel.
  • FIG. shows diagrammatically how in principle a movement as described above can be imparted to a workpiece clamping table.
  • the clamping table 11 is rotatably journalled 12, 13 on a shaft 14 which is connected via eccentrics 15 and 16 to the shafts l7 and 18 which in turn are rotatably journalled 19, 20 in a frame not shown.
  • measures not shown should be taken which ensure that the clamping table always assumes its horizontal position.
  • the clamping table 11 and hence the workpiece provided thereon may be given such a movement that any point of the workpiece performs a circular movement in its plane at right angles to the shafts 17, 18.
  • the radius of the said circular movement is equally large in any plane. If on the contrary the value of the eccentricities of the eccentrics l5 and 16 is chosen to be different, the radius of the performed circular movement will also vary with a spatial reliefgrinding as a result, for example, as is shown in FIG. 6 which shows a workpiece having a curvature the radius of which varies in the longitudinal direction.
  • FIGS. 7 and 8 are successively a perspective view partly broken away and a sectional view, respectively, of how the device can be realized structurally.
  • the device comprises a frame which is formed by a base plate on which two columns 26 and 27 are secured.
  • a workpiece clamping table 28 is suspended from a shaft 31 via bearings 29 and 30.
  • the shaft 31 is connected on either side by a pin 32 to a sliding member 33 which is incorporated in a groove in a disk 34.
  • the disks 34 are each connected to a shaft 35 which is journalled in columns 27 and 26, respectively.
  • each of the shafts 35 has a wormwheel 36 which cooperates with a worm 37.
  • the two worms are coupled by a geared belt 38 while furthermore the right-hand worm has a hand wheel 39.
  • the value of the eccentricity of the shaft 31 relative to the shaft 35 is adjustable by means of gauge blocks 40 which can be provided below the sliding members 33.
  • the front and rear side of the clamping table 28 has a slot-like recess 41 which extends at right angles to the surface of the table 28.
  • a guide element which fits in said recesses with a small amount of play is present in each of the said recesses.
  • the elements 42 are secured to a turntable 43 which is joumalled in a slide 44 which is movable in a direction at right angles to the direction of the shaft 35 along a guide 45 which is connected to the frame. It is achieved in this manner that the clamping table 28 can perform horizontal and vertical movements only, in other words, the clamping table 28 always remains horizontal.
  • the operation of the device is as follows.
  • the desired eccentricity corresponding to the curvature of the workpiece is first adjusted by means of the gauge blocks 40.
  • the workpiece 46 is then secured to the table 28 for grinding the curvature 47.
  • the grinding wheel 48 is then contacted with the side 48a of the workpiece, the eccentrics (sliding member 33 etc.) pointing forward horizontally.
  • the grinding wheel is then moved upwards and the eccentrics are moved to their lowermost position by means of the hand wheel 39, the worm 37 and the wormwheel 36, after which the lower side of the grinding wheel is contacted with the upper side 49 of the workpiece. Grinding then begins in which the eccentrics are moved forward through by means of the handwheel 39 etc. so that at the end the side of the grinding wheel again contacts the side 48a of the workpiece. So in this manner the curvature 47 has been ground.
  • the device according to the invention has the following advantages.
  • the device can readily be combined with a surface grinding machine, it being even possible to perform the surface grinding while the workpiece is clamped on the clamping table 25 of the device, the same grinding wheel being used for surface grinding and profile grinding.
  • a device for use with a grinding machine of the type having a rotatably mounted grinding wheel and a clamping table movable relative to each other in three mutually perpendicular directions, for grinding curved surfaces said device comprising a frame to be secured to said clamping table, a workpiece table movably mounted in said frame for supporting a workpiece to be ground, two eccentric couplings each rotatably journalled at one end thereof in said workpiece table and at the other end thereof in said frame for supporting said workpiece table in said frame for movement therein, means for separately adjusting the degree of eccentricity of each of said couplings for varying the radius of curvature of the curved surface to be machined, and means for causing rotational movement of said eccentrics so that a point on said workpiece and said workpiece table will describe a circular path in a plane at right angles to the axis of rotation of said eccentric couplings, the radius of said circular path being equal to the radius of curvature of the curved surface to be ground.
  • the device according to claim 1 further comprising at least one guide groove in said workpiece table extending at right angles to the surface thereof which supports said workpiece, a guide element rotatably journalled in a movable slide on said frame and cooperatively engaged in said guide groove, said slide movable in a direction transverse to the journalling axis of said eccentric couplings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00303391A 1971-11-10 1972-11-03 Device for grinding curved surfaces Expired - Lifetime US3855739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7115421A NL7115421A (es) 1971-11-10 1971-11-10

Publications (1)

Publication Number Publication Date
US3855739A true US3855739A (en) 1974-12-24

Family

ID=19814444

Family Applications (1)

Application Number Title Priority Date Filing Date
US00303391A Expired - Lifetime US3855739A (en) 1971-11-10 1972-11-03 Device for grinding curved surfaces

Country Status (10)

Country Link
US (1) US3855739A (es)
JP (1) JPS4858489A (es)
AT (1) AT319082B (es)
CH (1) CH566188A5 (es)
DE (1) DE2252264A1 (es)
ES (1) ES408380A1 (es)
FR (1) FR2160122A5 (es)
GB (1) GB1405919A (es)
IT (1) IT970285B (es)
NL (1) NL7115421A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037309A1 (en) * 1995-05-25 1996-11-28 C.H. Heist Corp. Safety switch system for hydroblasting operations
US10226901B2 (en) * 2013-01-16 2019-03-12 Rehau Ag + Co Method for rounding edges of polymer motor vehicle components
CN113814829A (zh) * 2021-09-02 2021-12-21 哈工大泰州创新科技研究院有限公司 一种可调倾角的铜钛合金打磨装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320672A (en) * 1940-11-25 1943-06-01 Cold Spring Granite Company Machine for grinding curved surfaces
US3239914A (en) * 1959-11-13 1966-03-15 Sony Corp Method of making magnetic heads

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320672A (en) * 1940-11-25 1943-06-01 Cold Spring Granite Company Machine for grinding curved surfaces
US3239914A (en) * 1959-11-13 1966-03-15 Sony Corp Method of making magnetic heads

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037309A1 (en) * 1995-05-25 1996-11-28 C.H. Heist Corp. Safety switch system for hydroblasting operations
US10226901B2 (en) * 2013-01-16 2019-03-12 Rehau Ag + Co Method for rounding edges of polymer motor vehicle components
CN113814829A (zh) * 2021-09-02 2021-12-21 哈工大泰州创新科技研究院有限公司 一种可调倾角的铜钛合金打磨装置

Also Published As

Publication number Publication date
FR2160122A5 (es) 1973-06-22
ES408380A1 (es) 1975-11-01
GB1405919A (en) 1975-09-10
DE2252264A1 (de) 1973-05-17
JPS4858489A (es) 1973-08-16
NL7115421A (es) 1973-05-14
IT970285B (it) 1974-04-10
AT319082B (de) 1974-12-10
CH566188A5 (es) 1975-09-15

Similar Documents

Publication Publication Date Title
US3299579A (en) Grinding machine
CN108972336A (zh) 一种可进行多方位调节的金属板材打磨用夹持工装
GB1450710A (en) Machine for producing aspherical surfaces
US3663188A (en) Cam control grinding machine
US4062150A (en) Centerless grinding method and device using same
US3842713A (en) Aspheric lens generator
US3678915A (en) Truing device for grinding wheel with rotating cup-shaped truing cutter
US3855739A (en) Device for grinding curved surfaces
GB1347828A (en) Lens cutting and bevel-edging machine
US3534502A (en) Apparatus and method for grinding an external surface of revolution
US3900971A (en) Machine for producing surfaces of optical lenses, for example toric surfaces
US3348341A (en) Abrasive disc spindle mounting
US4151783A (en) Apparatus for shaping a lug on a stamped workpiece
US3866359A (en) Surface grinding apparatus
US4015370A (en) Machine for grinding of peripheral surfaces on work pieces
US3834085A (en) Method and apparatus for forming a cabochon
US2463750A (en) Grinding apparatus
US1186616A (en) Lens grinding and polishing machine.
US2398451A (en) Dressing device for grinding wheels
US3115729A (en) Centerles grinding machine
US3815288A (en) Pattern machining system for die rolls
US2345986A (en) Cutter manufacture
US3877181A (en) Clamping assembly
US3857204A (en) Centerless grinding apparatus
US2181396A (en) Method of and means for making form tools