US3630187A - Trueing device for grinding discs - Google Patents

Trueing device for grinding discs Download PDF

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Publication number
US3630187A
US3630187A US51192A US3630187DA US3630187A US 3630187 A US3630187 A US 3630187A US 51192 A US51192 A US 51192A US 3630187D A US3630187D A US 3630187DA US 3630187 A US3630187 A US 3630187A
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United States
Prior art keywords
disc
carriage
dressing
templet
feeler
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Expired - Lifetime
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US51192A
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English (en)
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Engelbert Vossebrecher
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Individual
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Individual
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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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/08—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels controlled by information means, e.g. patterns, templets, punched tapes or the like
    • B24B53/081—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels controlled by information means, e.g. patterns, templets, punched tapes or the like by means of a template

Definitions

  • each feeler is a knife edge curved in a plane normal to the direction of travel of the carriage.
  • Each templet has a knife edge for engagement with the edge ofa respective feeler and extending at an angle to the edge of the respective feeler.
  • Each templet is adjustable in the frame laterally with respect to the direction of travel of the carriage and angularly about a pair of axes extending angularly to each other and to the direction of travel of the carriage.
  • the feelers are, preferably, adjustable on the slides in the direction in which the feeler edges extend.
  • the present invention relates to a trueing device for grinding discs.
  • the grinding of flanks of worms makes it necessary to profile the grinding discs in conformity with curve-shaped profiles, unless so-called K-worms are involved which are to be ground by means of a rectilinear trapezoidal conical disc.
  • the curve-shaped grinding disc profile represents the counter profile to the profile of the worm flank which counter profile is determined by the helical interengagement of the helical surface (worm flank) to be produced with the grinding disc.
  • the grinding disc may be correctly profiled by means of helical surface trueing devices.
  • a trueing diamond is reciprocated along the generatrix of the worm flank while the diamond or the entire trueing device, which in place of the worm to be ground is received between the points of the grinding machine, is simultaneously relative to the grinding disc passed along a helical path as is the case later with the worm to be ground by the trued disc. The diamond thus automatically produces the profile on the grinding disc which profile is more or less curved and pertains to the worm flank to be trued.
  • grinding disc profile depends on the grinding disc diameter so that these conditions have to be taken into consideration when narrow tolerances are involved.
  • a trueing or dressing device according to which both grinding disc flanks are, in the manner of an image, dressed by one templet, have to be produced with an extremely high precision if a proper profile symmetry is to be assured.
  • a possibly necessary correction on one worm flank is not possible in view of the profiling of both flanks by one templet.
  • an object of the present invention to provide a dressing device for profiling grinding discs for grinding helical surfaces, which will make it possible in a crowned or hollow manner to dress the two flanks of the grinding disc while employing two straight templets in conformity with circular arcs which are infinitely adjustable with regard to their radii within a wide range and with a very good approximation within the range of application.
  • the angle of inclination of the profile tangent is in the immediate profile point (intermediate profile angle) likewise adjustable in an infinitely fine manner, and in which the two flanks can be dressed accordingly to the same or different radii or profile angles.
  • FIG. 1 is a vertical section through the dressing device according to the invention, said section being taken along the line II of FIG. 2.
  • FIG. 2 represents a vertical section along the line II-ll of FIG. 1.
  • FIG. 3 is a horizontal section taken along the line III-III of FIG. 1.
  • FIG. 4 is a horizontal section taken along the line IV--IV of FIG. 1.
  • FIG. 5 represents a horizontal section taken along the line V-V of FIG. 1.
  • FIGS. 611-60 respectively diagrammatically indicate the arrangement of the templet and the feeler edge.
  • the dressing device is characterized primarily in that it is provided with two intercrossing two-arm levers which are mounted on a carriage radially displaceable with regard to the grinding disc, said levers being rotatable about a pivot.
  • the two ends of said two-arm levers engage by means of studs two slides which move in guiding means in opposite direction with regard to each other. of these slides, those slides which are arranged on the lever ends associated with the grinding disc carry the dressing diamonds for the two flanks of the grinding disc, whereas those slides which are associated with the other lever arms carry circularly curved flat feeler edges which in cross section are slanted in the manner of roof edges.
  • feeler edges engage two likewise similarly inclined rectilinear templets which are pivotable about two studs each and are arrestable.
  • the axis of one templet extends at a right angle with regard to the plane of the templet, whereas the axis of the other templet is parallel to the plane of the templet and at a right angle with regard to the direction of movement of the dressing carriage.
  • FIGS. I to 3 illustrate a carriage 10 which henceforth may be designated as dressing carriage.
  • This carriage is slidable in prismatic guides II in a vertical direction, the guiding strips of said prismatic guides 11 being connected to a baseplate 12.
  • the dressing carriage is moved upwardly and downwardly by a piston 13 which is driven in a cylinder 14 consisting of one piece with the baseplate 12, while the actuating oil under pressure is introduced into and withdrawn from said cylinder 14 through openings 15 and 16 respectively.
  • the openings 15 and 16 are. through conduits and control valves (not shown) connected to the hydraulic system of the machine.
  • feeler bodies 25a and 25b which are provided with feeler edges 26a and 26b which are inclined in a roof edge-shaped manner and, according to the embodiment shown in FIGS. 3 and 4, are curved along arcs.
  • the feeler bodies 25a, 25b are adjustable on slides 23a, 23b in grooves and, more specifically, in a direction transverse to the longitudinal direction of said slides.
  • the said feeler bodies 25a, 25b can be arrested by tightening screws.
  • the respective position of said feeler bodies can be read on dials 27a and 27b.
  • the circular feeler edges 26a and 26b are, by means of springs 32a and 31b (FIG. 5), pressed against templets 32a and 32b.
  • Said springs 31a and 31b are located in bores in the lower end of the dressing carriage and act upon the slides 24a, 24b while through the intervention of follower members 22a, 22b spreading the levers 18a, 18b apart.
  • These straight line templets which are likewise slanted in a roof-edge manner, are by means of screws connected to templet holders 33a and 33b.
  • the templet holders are, by means of studs 34a and 34b in slotted bearing bodies 35a and 35b, rotatable about axes 36a and 36b and by means of clamping screws are adapted to be arrested in customary manner.
  • the angular positions can be read on the dials 37a and 37b.
  • the bearing bodies 35a and 35b are mounted on baseplates a and 40b and are pivotable about trunnion screws 38a and 38b with their axes 39a and 39b.
  • the pivot angle is determined by end measure Band B, which may be placed between the bolts 41a and 41b and engaging surfaces 42a and 42b on the bearing bodies 35a, 35b.
  • the bearing bodies are clamped to the baseplates 40a, 40b by means of screws 43a and 43b extending through arched slots provided in said bearing bodies.
  • the two axes 36a, 39a and 36b, 39b intersect at the starting point of the templet profile which, consequently is retained in an unchanged manner with each adjustment of its position.
  • a slide 44 Guided in the upper portion of the dressing carriage is a slide 44 which, by means of an adjusting screw 45 with actuating head 46, is adapted to be moved forwardly and backwardly (FIG. 4).
  • This slide has its bottom side provided with two grooves 46:: and 46b which extend at an angle with regard to its direction of movement. It is in these grooves that the blocks 47a and 47b, screwed onto bars 48a and 48b, are movable.
  • the said bars 48a and 48b are in their turn connected to baseplates 40a, 40b which can be clamped to the bottom plate 12 by means of clamping screws 49a and 49b.
  • the downwardly extended piston rod 50 of the piston 13 extends into a bore 51 of a rotatable part 52 (FIG. 2).
  • the part 52 is rotatably joumaled in the baseplate 12 for rotation about its axis and has its lower end provided with a holder 53 for a diamond 54 adapted to dress the outer diameter of the grinding disc.
  • the rotatable part 52 has a helical slot 55 into which extends a pivot 56 screwed fast to the piston rod 50.
  • the piston rod 50 has its upper end nonrotatably connected to a nose of the dressing carriage.
  • the baseplate is in vertical direction (FIG. 3) guided on columns 57 and 58 (FIG. 3) which columns are anchored to a stand 59.
  • the stand 59 is, in a nonillustrated manner, screwed to the grinding head of the machine which grinding head comprises the bearing means and drive for the grinding disc.
  • a transmission motor 60 which, through the intervention of a worm drive and a toothed belt 61, drives a helical spindle 62.
  • the spindle 62 screws into a ratchet wheel 63 which is joumaled in the baseplate 12 and is designed in form of a nut.
  • This drive serves for a fast downward movement of the baseplate with the dressing carriage onto the grinding disc or for moving upwardly away from the dressing position.
  • the feeding into dressing position is effected in small steps by means of a pawl 64 which engages said ratchet wheel and is actuated by a nonillustrated oil operated piston.
  • FIGS. 6a, 6b and 6c for the elements of the dressing device which dress the right-hand flank of the grinding disc.
  • the index b characterizing this side has been omitted.
  • the image arrangement, corresponding remarks apply.
  • the stroke of the dressing carriage and thus of the diamond in vertical direction simultaneously represents the stroke of the feeler edge 26, and the stroke of the lower slide 24 with the diamond 29 in horizontal direction corresponds to the stroke of the feeler edges in this direction, which last mentioned stroke is controlled by the templets.
  • the templet has been pivoted about the axis 36 by an angle 4:, its contact point with the arc-shaped factor edge will be displaced during the vertical stroke in lateral direction (FIG. 6c and the horizontal stroke of the feeler edge and thus of the diamond is smaller in the range passed through by the extent of the height of the arc h, of the feeler edge than is the case in the zero position of the templet.
  • Each point of the feeler edge for instance, its zenith point located in zero position on the axis 36, will thus pass through a curved path 65 as indicated in dot-dash lines in FIG. 6b, and this path is also passed through by the dressing diamond.
  • the components x and y of the movement from the starting position indicated by s are obtained in which starting position the feeler edge 25 is laterally displaced from its zero position of s x tan 4).
  • the following values will be obtained for the components x and y:
  • the radial range of the profile with considerable curvature is only relatively small. This tendency can be taken into consideration to a certain extent by the dressing device according to the invention.
  • the main zenith point of the elliptical diamond path is, during the normal adjustment, located at the flank point on the intermediate profile height. If the zenith point is displaced further inwardly on the grinding disc profile, which can be effected without difficulties by a corresponding lateral displacement of the feeler edge 25, it will be appreciated that in view of approaching the secondary zenith point of the ellipse, toward the outer diameter of the disc profile, radii of a decreasing character are obtained which correspondingly act at the foot of the worm profile.
  • the dressing device according to the invention is not limited merely to the dressing or grinding discs by means of which worms or threads are to be ground which require a hollow curve grinding disc profile such as evolute worms. It is also possible according to the present invention to dress crowned grinding discs, for instance, for grinding worms with rectilinear normal cutting profile, so-called N-worms. To this end, it is merely necessary, as indicated in FIG. 3, to employ hollow feeler edges, whereas they have to be curved when they are intended for grinding evolute worms.
  • a dressing device for dressing a grinding disc especially a grinding disc for a worm or thread-grinding machine: a
  • a dressing device in which the said edges of said templets extend generally in the direction of movement of said carriage, the said first axes being disposed in a second plane parallel to the direction of movement of said carriage and said second axes being normal to said second plane.
  • a dressing device in which the said first and second axes for each templet intersect at one end of the said edge of the respective templet.
  • a dressing device in which said feeler members are mounted on said slides for adjustment thereon in said first mentioned plane lateral to the direction of movement of said slides on said carriage.
  • a dressing device which includes a baseplate for each templet and having means thereon forming the respective said first and second axes, and means for adjusting said baseplates on said frame in a direction transverse to the direction of movement of said carriage.
  • a dressing device which includes a support member on each baseplate pivotally connected thereto on the respective second axis, and a shaft rotatable in each support member on the respective first axis and supporting the respective templet.
  • a dressing device which includes an abutment stud on each baseplate and an opposed abutment surface on each support member adapted to receive a gauge block therebetween for setting the position of the respective support member on the baseplate pertaining thereto.
  • a dressing device in which the said edge of each templet is linear.
  • a dressing device which includes a third dressing element on said carriage at the disc end thereof presented radially toward said disc and movable axially of the disc for dressing the periphery of the disc.
  • a dressing device which includes resilient means acting between said first and second dressing elements for biasing said slides in a direction to press the feeler members thereon against the respective templets.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US51192A 1969-07-04 1970-06-30 Trueing device for grinding discs Expired - Lifetime US3630187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1934035 1969-07-04

Publications (1)

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US3630187A true US3630187A (en) 1971-12-28

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US (1) US3630187A (de)
CH (1) CH501466A (de)
FR (1) FR2052891A5 (de)
GB (1) GB1264061A (de)
SE (1) SE351586B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815568A (en) * 1971-07-28 1974-06-11 Waldrich Werkzeugmasch Template controlled trueing device with an adjustable template follower
US4341044A (en) * 1980-05-19 1982-07-27 Mcdonnell Douglas Corporation Machine for grinding gashes in end mill cutters
CN102765055A (zh) * 2012-07-25 2012-11-07 湖北威风汽车配件股份有限公司 高精高效15°倾角砂轮修整器
CN108747803A (zh) * 2018-05-02 2018-11-06 芜湖杰诺科技有限公司 一种便于阀体制作的研磨装置
CN110757283A (zh) * 2019-10-16 2020-02-07 广州铁路职业技术学院（广州铁路机械学校） 一种边角打磨机
CN114952446A (zh) * 2022-05-27 2022-08-30 张小泉股份有限公司 一种剪刀整形开齿装置及使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825753A (en) * 1926-02-17 1931-10-06 Cincinnati Grinders Inc Truing mechanism
US2190132A (en) * 1938-07-02 1940-02-13 Norton Co Grinding wheel truing apparatus
US2282038A (en) * 1939-10-07 1942-05-05 Gould & Eberhardt Variable trimmer cam
US2340192A (en) * 1942-01-01 1944-01-25 Ex Cell O Corp Dressing mechanism
US3434464A (en) * 1965-01-22 1969-03-25 Mas Fab Kapp & Co Device with adjustable templet for dressing profiled grinding wheels

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825753A (en) * 1926-02-17 1931-10-06 Cincinnati Grinders Inc Truing mechanism
US2190132A (en) * 1938-07-02 1940-02-13 Norton Co Grinding wheel truing apparatus
US2282038A (en) * 1939-10-07 1942-05-05 Gould & Eberhardt Variable trimmer cam
US2340192A (en) * 1942-01-01 1944-01-25 Ex Cell O Corp Dressing mechanism
US3434464A (en) * 1965-01-22 1969-03-25 Mas Fab Kapp & Co Device with adjustable templet for dressing profiled grinding wheels

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815568A (en) * 1971-07-28 1974-06-11 Waldrich Werkzeugmasch Template controlled trueing device with an adjustable template follower
US4341044A (en) * 1980-05-19 1982-07-27 Mcdonnell Douglas Corporation Machine for grinding gashes in end mill cutters
CN102765055A (zh) * 2012-07-25 2012-11-07 湖北威风汽车配件股份有限公司 高精高效15°倾角砂轮修整器
CN108747803A (zh) * 2018-05-02 2018-11-06 芜湖杰诺科技有限公司 一种便于阀体制作的研磨装置
CN110757283A (zh) * 2019-10-16 2020-02-07 广州铁路职业技术学院（广州铁路机械学校） 一种边角打磨机
CN114952446A (zh) * 2022-05-27 2022-08-30 张小泉股份有限公司 一种剪刀整形开齿装置及使用方法

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Publication number Publication date
GB1264061A (en) 1972-02-16
SE351586B (de) 1972-12-04
CH501466A (de) 1971-01-15
FR2052891A5 (de) 1971-04-09

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