US3905156A - Thread grinding machine with a device for the relief grinding of the threads on tap drills and internal thread formers - Google Patents

Thread grinding machine with a device for the relief grinding of the threads on tap drills and internal thread formers Download PDF

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Publication number
US3905156A
US3905156A US505057A US50505774A US3905156A US 3905156 A US3905156 A US 3905156A US 505057 A US505057 A US 505057A US 50505774 A US50505774 A US 50505774A US 3905156 A US3905156 A US 3905156A
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grinding
work
upper portion
rocking lever
piece
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Expired - Lifetime
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US505057A
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English (en)
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Emil Vogelsanger
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Reishauer AG
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Reishauer AG
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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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/18—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of taps or reamers
    • B24B3/22—Relief cutting of taps or reamers

Definitions

  • Some devices use oscillating movements of the grinding-disk orof the grinding carriage, respectively, which is guided in the sliding guideways or roller guideways, in radial direction with reference to the rotating work-piece which is shifted in its axial direction.
  • Use is also made of oscillating swivel movements of the work-piece or of the work-piece support in radial direction about an axis located in the work-piece carriage with reference to the rotating grinding disk, while the work-piece rotates and is shifted with the workpiece carriage in its axial direction.
  • Means are also provided for using the forward and backward rotary movements of the eccentric bearing bushings of the grinding spindle arranged in the grinding carriage, whereby oscillating movements are imparted to the grinding disk in radial direction with reference to the rotating work-piece which is shifted in its axial direction.
  • Still other devices use swivel movements only of the tip of the tailstock about a point of rotation which lies in the general axial plane of grinding disk and workpiece, whereby during the grinding, the work-piece carries out oscillating swivel movements with reference to the rotating grinding disk, while the work-piece rotates and is shifted in its axial direction.
  • Relief grinding according to this method results in a geometrical flaw, as the relief grinding movements are carried out by means of oscillating swivel movements of the tool, which leads to flaws in the included angle of thread on the thread profile.
  • the circumferential speed of the work-piece In order to beable to make use of the advantages resulting from high speed grinding, that is, grinding with higher circumferential speeds of the grinding disk, for example 60 meters per second, the circumferential speed of the work-piece must be brought into a suitable relationship with the circumferential speed of the grinding disk. In order to be able to fulfill this requirement the rate of rotation of the work-piece would have to be increased substantially as compared with conditions previously'in' use. This, however, demands necessarily also a correspondingly. greater frequency of the number of relief grinding movements determined by the rate of rotation of the work-piece and number of grooves (in the case of the internal thread former it is the number of rolling edges).
  • the means and methods mentioned above in paragraphs a to f do not allow relief grinding strokes of high frequencies because large masses must be moved back and forth in very short periods of time over very short distances.
  • the purpose of the invention herein is to provide in a thread grinding machine means for efficiently increasing the frequency of the relief grinding strokes. This is done by providing a work carriage constructed in two parts (a base portion and upper portion) which are interconnected to each other by yieldable guide elements which allow an essentially friction free oscillation of the two parts with respect to each other. In addition the guide elements are subject to only a minimum of wear. Furthermore, control means interconnecting the two parts are provided and this control means includes means for varying the amount of the relief grinding stroke between zero and a predetermined maximum value.
  • FIG. 1 shows a view in elevation of a thread grinding machine for thread borers and internal thread formers
  • FIG. 2 shows a section through line II--II of FIG. 1 through the upper portion, the base portion and the guide of the base portion in the frame;
  • FIG. 2a shows a modified version in section of a leaf spring similar to that shown in FIG. 2;
  • F IG. 3 shows a view in elevation of the upper portion and of the base portion partially in section
  • FIG. 4 is a plan view of the upper portion (partially in section) showing the mechanism for the adjustment of the relief grinding stroke;
  • FIG. 5 is a plan view of the mechanism for the adjustment of the relief grinding stroke with a relief grinding stroke of the size zero;
  • FIG. 6 is a plan view showing a gearing arrangement for a relief grinding device embodying the invention.
  • FIG. 7 is an enlarged detail of a portion of the gearing arrangement shown in FIG. 6;
  • FIG. 8 is a diagrammatic illustration of the leaf spring connection of the base portion with the upper portion showing the pretensioning
  • FIG. 9 is a thread boring device withtrelief thread profile in cross-section.
  • FIG. 10 is an internal thread former in cross-section.
  • the thread grinding machine shown diagrammatically in FIG. 1 has a frame 1 which serves as base for the slidable reception of the work-piece carriage consisting of the base portion 2, upper portion 3 and grinding carriage 4.
  • the feed and return device for the grinding carriage 4 with the grinding disk 5 and the grinding disk driving motor 6 as well as other elements of the thread grinding machine not influencing the relief grinding device according to the invention are not specifically shown and described as they are well known.
  • the work-piece gearbox 7 which is rigidly connected to' the base portion 2.
  • the upper portion 3 with the center rest 8 (FIG. 4) affixed thereto and the longitudinally slidable tailstock 9 is connected with the base portion 2 through leaf springs 10 or leaf spring stacks 11 (FIG. 2a) so that a type of flexible rectangular joint is formed (FIGS. 2 and 8) whereby the upper portion 3, by means to be hereinafter described, may be set in oscillating motion, that is, to produce relief grinding movements extending transversely to the work-piece axis A (FIGS. 2 and 4).
  • the production of the oscillating movements of the upper portion 3 is accomplished with the aid of a changeable cam disk 14 (FIG. 4) which is fixed on the shaft 43 rotatably positioned in the base portion 2 and is driven through the work-piece gearbox 7 (FIG. 6).
  • a rocking lever 15 is used (FIGS. 4 and 6).
  • the rocking lever 15 is pivotally mounted in the base portion 2 on a shaft 16.
  • a template profile or cam C (FIGS.
  • Adjusting to the desired relief grinding stroke B is undertaken with the aid of a zero mark which is positioned on the rotary button 21 of the pinion 20 and a scale ring 22 connected therewith.
  • a roller follower 23 which continuously rides on the cam disk 14 under the influence of compression Spring 24.
  • control members l4, 15, 16, l7, l8, l9 and 23 used for the production of the oscillating movements of the upper portion 3 are arranged and installed in such manner that the leaf springs 10 or stacks of leaf springs 11 are always deflected in the same direction, for example, to the left as shown in FIG. 8, and therefore, they are subjected to an initial pretensioning force G always acting in the same direction. For this reason, within the entire relief grinding stroke range, the upper portion 3 is biased continuously with respect to the baseportion 2 via the mentioned control members by a similarly directed spring force H, that is, by means of the reaction force to the initial stressing force G.
  • a compression spring 24 there is arranged between the base portion 2 and the rocking lever 15 a compression spring 24.
  • the return movements of the upper portion 3 leading away from the grinding disk 5 are brought about solely by means of the spring force H (FIG. 8) of the deflected leaf springs 10 or stacks of leaf springs l 1, while the feed movements of the cam disk 14 are necessarily imparted through the rocking lever 15 to the upper portion 3.
  • the length of the leaf springs or leaf spring stacks, respectively, arranged between the upper and base portion parallel to the axis of the work-piece is coextensive with the length of the upper and base portions. This prevents debris from being deposited on the mentioned control members consisting of a cam disk, roller, rocking lever, bushing, slide roll and two rotary axles.
  • the motor 25 which is fixed on the workpiece gearbox 7, serves for the production of the rotary movement of the work-piece 26, the longitudinal shifting of the work-piece carriage which consists of the base portion 2 and the upper portion 3 and it serves also for the production of the rotary movement of the cam disk 14 or the oscillating movements of the upper portion 3, respectively.
  • the gear 28, the gear 29, the shaft 30, the change gear 31, the change gear 32 and the shaft 33 are driven by the motor 25 (see FIG. 6) through the shaft 27.
  • the motor 25 see FIG. 6
  • its drive is effected by the shaft 33 through the axially shiftable or sliding gear 34 which is frictionally connected with said shaft and via the gear wheel which is in engagement with said shiftable gear 34 and the gear wheel 35 on the shaft 36 which is in engagement with the gear 34 and from there through the transversely slidable coupling 13, the work-piece spindle 12 in the center rest 8, the driving disk 37 and the lathe dog 38 (FIG. 4).
  • the shaft 30 also drives the shaft 43 positioned in the base portion 2.
  • the cam disk l4 isfixed to the shaft 43 for the production of the relief grinding stroke.
  • the"stcm 48 of the differential drive'arranged between the shafts 30 and 43 is lockedby means, not shown. From' the shaft 30, the rotary movement is transferred through the gear wheels 44, 45, 46and 47 to the shaft 43. Under of rotation as the shaft 30. V I
  • the changeable gear, drive comprising 'the gear wheels 31 and 32, se es'for the determination of the various rates of rotat between work-piece 26 and cam disk 14, whereby an the workpiece 26to be ground a relief grinding movementmust be applied to each groove or roller' l
  • th'e' shaft' 43 rotatesat the same rate
  • Each rotary movement of the gear wheel cluster 52 is transferred through the gear N to the gear 0 of the gear wheel cluster 54 loosely rotatably disposed on the shaft 27 and from the latter through the ring gear P to the gear wheel 55.
  • the latter is fixed on the stem 48 of the differential gear.
  • the stem 48 carries out a rotary movement which, through the gear wheels 44, 45, 46 and 47 of the differential drive already mentioned, is transferred to the shaft 43 or the cam disk 14 fixed thereupon.
  • the drive of the guide spindle or lead screw 56 or the longitudinal displacement of the workpiece carriage, which consists of base portion 2 and upper portion 3, takes place by the mentioned shaft 33.
  • the number of revolutions of the lead screw 56 is determined by means of the change gears 57, 58, 59 and 60 in a mathematical ratio determined by the rate of rotation of the workpiece 26, so that the desired thread pitch is produced on the workpiece 26 to be ground.
  • the sliding gear cluster 61 comprising the gears Q and R which is slidably arranged on the shaft 33, is
  • the lead screw 56 itself is rotatably positioned in the base portion 2 of the 'work-piece carriage or in the work-piece gearbox 7 connected with it, but is held against axial movement.
  • the guide spindle56 provided with a left hand thread is screwed into the spindle nut 65 which is secured on theframe l by screws or other suitable means and is further secured against rotation.
  • the guide spindle 56 is secured in the spindle nut 65.
  • the direction of rotation of the motor 25 is changed.
  • the guide spindle or lead screw 56.as a result is screwed out of the spindle nut 65 and as a'result of this the work-piece carriage is displaced from right to left.
  • a thread grinding machine with a device for the relief grinding of the thread on thread boring devices and internal thread formers in which the rotating workpiece is positioned coaxially with the axis of the workpiece spindle on a work-piece carriage comprising:
  • a grinding disk assembly mounted on the machine movable radially with reference to the work-piece and parallel to the axis of the work-piece;
  • a work-piece carriage including an upper portion and a base portion, which are relatively movable to each other;
  • interconnecting means interconnecting said upper and base portions said interconnecting means comprising yieldable guide means which extend between said upper and base portions in 'a manner to position said upper and base portions in spaced relation to each other and to guide said upper portion in its movement with respect to said base portion and thereby reduce friction and wear on said base portion;
  • control means for displacing said upper portion with respect to said base portion including a rocking lever interconnecting said upper and base portions for controlling said displacement in accordance with the desired relief grinding movement.
  • said guide means comprise leaf springs interconnecting said base portion and said upper portion.
  • said guide means comprise leaf springs interconnecting said base portion and said upper portion
  • control means for displacing said upper portion includes v an interchangeable cam disk
  • rocking lever pivotally mounted in said base portion and operatively associated with said cam disk to be actuated by the rotation of said cam disk
  • a sliding roller rotatably positioned in said upper portion and operatively associated with said rocking lever whereby oscillating movement of said rocking lever is transmitted through said sliding roller to said upper portion.
  • the grinding machine of claim 4 including a circumfcrentially adjustable cam associated with said control means for the displacement of said upper portion include an interchangeable cam disk, a rocking lever pivotally mounted in said base portion and operatively associated with said cam disk to be actuated by the rotation of said cam disk, and a sliding roller rotatably positioned in said upper portion and operatively associated with said rocking lever whereby oscillating movement of said rocking lever is transmitted through said sliding roller to said upperportion.
  • the rocking lever includes a follower roller rotatably positioned thereon and which is in continuous engagement with said cam disk.
  • the grinding machine of claim 1 including a circumferentially adjustable cam associated with said rocking lever through which cam said rocking v lever acts on said sliding roller rotatably positioned on a shaft fixed in said upper portion, whereby the amount of the relief grinding stroke may be adjusted between zero and a predetermined maximum value.
  • the grinding machine of claim 1 including an adjustable cam disposed in the bore of a bushing rotatably disposed in said rocking lever.
  • said adjustable cam comprises a radially inwardly projecting portion formed on the internal surface of said bushing.
  • said adjustable cam comprises a radially inwardly projecting portion formed on the internal surface of said bushing, said projecting portion comprising an arcuate portion whose circumscribing radius coincides with the pivotal pointof said rocking lever.
  • first gear means operatively associated with said bushing; and i second rotatable gearmeans in mesh with said first gear means for rotating said first gear means and said bushing and said adjustable cam associated therewith for makaing a setting of the desired relief grinding stroke.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US505057A 1973-09-17 1974-09-11 Thread grinding machine with a device for the relief grinding of the threads on tap drills and internal thread formers Expired - Lifetime US3905156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1330173A CH570239A5 (enrdf_load_stackoverflow) 1973-09-17 1973-09-17

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US3905156A true US3905156A (en) 1975-09-16

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US505057A Expired - Lifetime US3905156A (en) 1973-09-17 1974-09-11 Thread grinding machine with a device for the relief grinding of the threads on tap drills and internal thread formers

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US (1) US3905156A (enrdf_load_stackoverflow)
JP (1) JPS5835830B2 (enrdf_load_stackoverflow)
CH (1) CH570239A5 (enrdf_load_stackoverflow)
DD (1) DD113464A5 (enrdf_load_stackoverflow)
DE (1) DE2442384C3 (enrdf_load_stackoverflow)
GB (1) GB1485433A (enrdf_load_stackoverflow)
HU (1) HU171509B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358911A (en) * 1979-12-28 1982-11-16 Reishauer Ag Machine for relief grinding tap threads
US4454689A (en) * 1981-09-09 1984-06-19 Itm International Tool Machines, Inc. Clamping arrangement
US4475319A (en) * 1980-11-14 1984-10-09 Walter Wirz Process for machining a worm-type workpiece with a worm-type tool
US4484931A (en) * 1981-01-05 1984-11-27 Anthony Kushigian Thread grinder
US4813188A (en) * 1985-06-27 1989-03-21 Buderus Aktiengesellschaft Method of shaping workpieces especially forming undercut archimedean spirals
US20060185170A1 (en) * 2005-02-23 2006-08-24 Paul Lewis Methods for manufacturing endodontic instruments from powdered metals
US20060185169A1 (en) * 2005-02-23 2006-08-24 Paul Lewis Methods for manufacturing endodontic instruments
US20080213720A1 (en) * 2003-05-13 2008-09-04 Ultradent Products, Inc. Endodontic instruments manufactured using chemical milling
US20090104854A1 (en) * 2006-03-03 2009-04-23 Erwin Junker Method for Relief-Grinding the Cutting Teeth of Taps, Thread Formers, and Similar Tools, and Grinding Machine for Carrying Out Said Method
CN107971586A (zh) * 2017-12-25 2018-05-01 浙江嘉益保温科技股份有限公司 一种便于模具螺牙加工装置
CN113927438A (zh) * 2021-09-23 2022-01-14 浙江维克机械科技有限公司 丝锥加工中心及加工方法
CN114083363A (zh) * 2021-11-29 2022-02-25 河北力准机械制造有限公司 一种丝锥加工机床
CN116276340A (zh) * 2023-03-30 2023-06-23 成都成量螺纹工具有限公司 一种用于磨削螺尖丝锥螺尖槽的专用工装

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036153C2 (de) * 1980-09-23 1985-06-27 Herbert Lindner Gmbh, 1000 Berlin Vorrichtung zum Hinterschleifen und Polygonschleifen an Schleifmaschinen
DE3037568C2 (de) * 1980-10-04 1985-04-11 Günther & Co, 6000 Frankfurt Genuteter Gewindebohrer
DE3043261A1 (de) * 1980-11-15 1982-07-01 Reishauer AG, 8000 Zürich Gewindeschleifmaschine mit einrichtung zum hinterschleifen des gewindes an gewindebohrern und innengewindeformern
DE3236440A1 (de) * 1982-10-01 1984-04-05 Reishauer AG, 8304 Wallisellen Verfahren zum schleifen eines gewindebohrers und schleifscheibe zur durchfuehrung des verfahrens
JPS60151329U (ja) * 1984-03-19 1985-10-08 株式会社クボタ コンバインの刈取穀桿搬送構造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798832A (en) * 1927-09-02 1931-03-31 Buckingham Earle Worm and tap grinder
US2469077A (en) * 1947-07-31 1949-05-03 Rickenmann Alfred Machine tool with automatic feed device
US2929172A (en) * 1956-07-16 1960-03-22 Norman Ind Inc Van Machine for cutting a succession of workpieces to a predetermined size

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798832A (en) * 1927-09-02 1931-03-31 Buckingham Earle Worm and tap grinder
US2469077A (en) * 1947-07-31 1949-05-03 Rickenmann Alfred Machine tool with automatic feed device
US2929172A (en) * 1956-07-16 1960-03-22 Norman Ind Inc Van Machine for cutting a succession of workpieces to a predetermined size

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358911A (en) * 1979-12-28 1982-11-16 Reishauer Ag Machine for relief grinding tap threads
US4475319A (en) * 1980-11-14 1984-10-09 Walter Wirz Process for machining a worm-type workpiece with a worm-type tool
US4484931A (en) * 1981-01-05 1984-11-27 Anthony Kushigian Thread grinder
US4454689A (en) * 1981-09-09 1984-06-19 Itm International Tool Machines, Inc. Clamping arrangement
US4813188A (en) * 1985-06-27 1989-03-21 Buderus Aktiengesellschaft Method of shaping workpieces especially forming undercut archimedean spirals
US20080213720A1 (en) * 2003-05-13 2008-09-04 Ultradent Products, Inc. Endodontic instruments manufactured using chemical milling
US7743505B2 (en) 2005-02-23 2010-06-29 Ultradent Products, Inc. Methods for manufacturing endodontic instruments from powdered metals
US20060185170A1 (en) * 2005-02-23 2006-08-24 Paul Lewis Methods for manufacturing endodontic instruments from powdered metals
US20060185169A1 (en) * 2005-02-23 2006-08-24 Paul Lewis Methods for manufacturing endodontic instruments
US7665212B2 (en) 2005-02-23 2010-02-23 Ultradent Products, Inc. Methods for manufacturing endodontic instruments
US20090104854A1 (en) * 2006-03-03 2009-04-23 Erwin Junker Method for Relief-Grinding the Cutting Teeth of Taps, Thread Formers, and Similar Tools, and Grinding Machine for Carrying Out Said Method
US8419504B2 (en) * 2006-03-03 2013-04-16 Erwin Junker Maschinenfabrik Gmbh Method for relief-grinding the cutting teeth of taps, thread formers, and similar tools
CN107971586A (zh) * 2017-12-25 2018-05-01 浙江嘉益保温科技股份有限公司 一种便于模具螺牙加工装置
CN113927438A (zh) * 2021-09-23 2022-01-14 浙江维克机械科技有限公司 丝锥加工中心及加工方法
CN114083363A (zh) * 2021-11-29 2022-02-25 河北力准机械制造有限公司 一种丝锥加工机床
CN114083363B (zh) * 2021-11-29 2023-03-24 河北力准机械制造有限公司 一种丝锥加工机床
CN116276340A (zh) * 2023-03-30 2023-06-23 成都成量螺纹工具有限公司 一种用于磨削螺尖丝锥螺尖槽的专用工装
CN116276340B (zh) * 2023-03-30 2023-10-17 成都成量螺纹工具有限公司 一种用于磨削螺尖丝锥螺尖槽的专用工装

Also Published As

Publication number Publication date
GB1485433A (en) 1977-09-14
JPS5056692A (enrdf_load_stackoverflow) 1975-05-17
CH570239A5 (enrdf_load_stackoverflow) 1975-12-15
DD113464A5 (enrdf_load_stackoverflow) 1975-06-12
HU171509B (hu) 1978-01-28
DE2442384C3 (de) 1980-03-13
DE2442384A1 (de) 1975-03-27
DE2442384B2 (de) 1979-07-05
JPS5835830B2 (ja) 1983-08-05

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