EP0548957A1 - Spitzenloses Schleifverfahren und spitzenlose Schleifvorrichtung für Stufenwerkstück - Google Patents

Spitzenloses Schleifverfahren und spitzenlose Schleifvorrichtung für Stufenwerkstück Download PDF

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Publication number
EP0548957A1
EP0548957A1 EP92121912A EP92121912A EP0548957A1 EP 0548957 A1 EP0548957 A1 EP 0548957A1 EP 92121912 A EP92121912 A EP 92121912A EP 92121912 A EP92121912 A EP 92121912A EP 0548957 A1 EP0548957 A1 EP 0548957A1
Authority
EP
European Patent Office
Prior art keywords
diameter portion
grinding
small
work
grinding wheel
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.)
Withdrawn
Application number
EP92121912A
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English (en)
French (fr)
Inventor
Tokufumi Takeuchi
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.)
Micron Machinery Co Ltd
Original Assignee
Micron Machinery Co Ltd
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 JP4864992A external-priority patent/JP2654301B2/ja
Priority claimed from JP4317240A external-priority patent/JPH05228810A/ja
Application filed by Micron Machinery Co Ltd filed Critical Micron Machinery Co Ltd
Publication of EP0548957A1 publication Critical patent/EP0548957A1/de
Withdrawn legal-status Critical Current

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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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/01—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor for combined grinding of surfaces of revolution and of adjacent plane surfaces on work
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work

Definitions

  • the present invention relates to a centerless grinding of a stepped cylindrical work having a large- and smaller-diameter portions which are concentric with each other, and a centerless grinding machine which carries out the method of centerless grinding.
  • Figs. 1(A) and 1(B) schematically show a conventional centerless grinding of a stepped cylindrical work 1.
  • Fig. 1(A) is a schematic plan view of the essential part of a conventional centerless grinding machine
  • Fig. 1(B) is also a front view of the part in Fig. 1(A).
  • the work 1 has a large- and small-diameter portions, and thus each of the grinding wheel 2 and the regulating wheel 3 has a large- and small-diameter portions corresponding to the small- and large-diameter portions, respectively, of the work 1.
  • the work 1 is supported on a work support blade 4, the large-diameter portion of the regulating wheel 3 and that of the grinding wheel 2 are put into contact with the small-diameter portion of the work 1 while the small-diameter portion of the regulating wheel 3 and that of the grinding wheel 2 are put into contact with the large-diameter portion of the work 1.
  • a stepped grinding wheel and a stepped regulating wheel are used correspondingly to the shape of a stepped work.
  • the ratio in peripheral speed between the large- and small-portions of the grinding wheel is equal to that in diameter.
  • the wheel peripheral speed for grinding the large-diameter portion of the work cannot be controlled independently of that for the small-diameter portion.
  • the difference in diameter between the large- and small-diameter portions of the stepped work causes a difference in peripheral speed between the grinding surfaces of the grinding wheel, which will cause the grinding to be unstable.
  • the regulating wheel is provided to control the rotating speed of the work, any slip caused between the work and the regulating wheel has an adverse affect on the precision of machining.
  • the present invention is proposed to overcome the drawbacks of the prior-art centerless grinding.
  • the present invention has a primary object to provide a method of centerless grinding for a stepped work, in which the outer circumference of the stepped work can be centerless-ground with a high precision and the end face of the stepped portion can be grounded as necessary, and also a centerless grinding machine suitable for carrying out the method.
  • the present invention has a second object which is incidental to the above primary object.
  • the second object is to grind the end face (perpendicular to the axis) of the stepped portion of a stepped work with a high precision while accomplishing the primary object.
  • the present invention has a third object to finish the stepped portion of a stepped work to a conical surface with any portion remaining unfinished.
  • a grinding wheel for grinding the large-diameter portion of a stepped work and a grinding wheel for grinding the small-diameter portion of the work are formed separately from each other, and individually rotated and controlled.
  • the large-diameter portion of the work is supported by a regulating wheel dedicated for the large-diameter portion and a work support blade while the small-diameter portion is supported by a shoe, which is a stationary member, and on the work support blade.
  • the method of centerless grinding to accomplish the primary object of the present invention based on the above basic technical principle is such that the grinding wheel for large-diameter portion of a stepped work, of which the peripheral speed is independently controlled, is used to grind the work at the large-diameter portion thereof supported by the work support blade and the regulating wheel; the grinding wheel for small-diameter portion of the work, of which the peripheral speed is controlled independently of the large-diameter portion grinding wheel, is moved radially to grind the work at the small-diameter portion thereof supported by the stationary shoe and the work support blade; and the end face of the stepped portion of the work is ground as necessary while the small-diameter portion grinding wheel is moved radially.
  • the centerless grinding machine to accomplish the above primary object comprises (a) a large-diameter portion grinding wheel with a rotation driving means of which the peripheral speed is controllable, a work support blade provided to support the large-diameter portion of a stepped work in relation to the large-diameter portion grinding wheel, and a regulating wheel operative in cooperation with the work support blade to support and move the large-diameter portion of the work radially toward the large-diameter portion grinding wheel; (b) a small-diameter portion grinding wheel with a rotation driving means of which the peripheral speed is controllable independently of the rotation driving means of the large-diameter portion grinding wheel, a driving means of radially moving the small-diameter portion grinding wheel, and a shoe fixed relative to the blade and opposite to the small-diameter portion grinding wheel behind the small-diameter portion of the work, the work support blade also supporting the small-diameter portion of the work in relation to the small-diameter portion grinding
  • the large- and small-diameter portion grinding wheels are formed individually, and the small-diameter portion grinding wheel can be moved radially.
  • the small-diameter portion of the work can be finished as moved to a position where it is ground to a desired dimension. Since the small- and large-diameter portion grinding wheels can be controlled in peripheral speed independently of each other, each of them can provide a high-precision centerless grinding at an optimum peripheral speed.
  • the above second object of the present invention is accomplished by grinding the work at the stepped portion thereof by the centerless grinding machine having the above-mentioned construction while moving the small-diameter portion grinding wheel radially toward the work.
  • the above third object of the present invention is accomplished by grinding the cylindrical and conical surfaces of the small-diameter portion of the stepped work by the centerless grinding machine having the above-mentioned construction and grinding, thereafter, a portion near the boundary between the cylindrical and conical surfaces of the large-diameter portion of the work while moving the work toward the cylindrical surface of the large-diameter portion in relation to the large-diameter portion grinding wheel.
  • the centerless grinding machine has an essential part schematically illustrated in Figs. 2(A) and 2(B).
  • Fig. 2(A) is a schematic plan view of the centerless grinding machine
  • Fig. 2(B) is a schematic front view of the same.
  • the grinding wheel 7 for the large-diameter portion of a stepped work and a grinding wheel 8 for the small-diameter portion of the work are formed separately from each other, and driven by independent drive mechanisms 12a and 12b, respectively, in such a manner that their speeds of rotation can be adjusted separately.
  • the centerless grinding machine has a regulating wheel 9 which is driven by a drive mechanism 14 and also reciprocated by a feed mechanism in the directions of both-headed arrow a , as will be further discussed later with reference to Fig. 4.
  • the grinding wheel 8 for the small-diameter portion of the work is reciprocated radially of the work by a feed mechanism in the directions of both-headed arrow b, as will be further discussed later with reference to Fig. 4.
  • the grinding wheel 7 for the large-diameter portion of the work can be moved by a manual control in the directions of both-headed arrow c , as will be further discussed later with reference to Fig. 3.
  • Figs. 3 to 5 show an embodiment of the centerless grinding machine according to the present invention.
  • Fig. 3 is a plan view of the entire centerless grinding machine
  • Fig. 4 is a front view of the same
  • Fig. 5 is a perspective view of the same.
  • the small-diameter portion grinding wheel 8 is rotated as driven by the drive motor 12b in such a manner that its speed of rotation can be adjusted, and also reciprocated by a feed motor 19 radially (in the direction of both-headed arrow b ).
  • the regulating wheel 9 is disposed opposite to the large-diameter portion grinding wheel 7. It is moved as driven by the drive motor 14 in such a manner that its speed of rotation can be adjusted, and also reciprocated by feed motors 15 and 16 in the directions of both-headed arrow a .
  • the reference numeral 21 denotes a grinding wheel dressing mechanism and 22 a manual knob for dressing of the regulating wheel.
  • the reference numeral 11 denotes a work support blade. However, since the drawing is much reduced in scale, the reference numeral 11 only points the location of the blade.
  • the work support blade 11 is not shown in Fig. 3.
  • the feed motor 15 for an upper slider reciprocates the regulating wheel 9 and its drive laterally of the drawing
  • the feed drive 16 for a lower slider reciprocates the regulating wheel 9 and its drive along with the work support blade 11 laterally of the drawing.
  • FIG. 6(A) is a plan view schematically illustrating the step of preparation for a centerless grinding.
  • the reference numeral 1' denotes a blank which is fed in the direction of arrow g .
  • the work support blade is not shown in Figs. 6(A) and 6(B) for the simplicity of illustration.
  • the regulating wheel 9 and the large-diameter portion grinding wheel 7 are placed opposite to each other in a same manner as in the machining of a stepped work at the large-diameter portion thereof by the conventional centerless grinding.
  • the small-diameter portion grinding wheel 8 movable radially (in the directions of both-headed arrow b ) is placed flush at the side S thereof opposite to the work with the side S' of the large-diameter portion grinding wheel 7 or slightly set back from the side S'.
  • a shoe 10 is set in a position where it will circumscribe the small-diameter portion of the stepped work at the radius r thereof.
  • the drive mechanism 12a controls the speed of rotation of the large-diameter portion grinding wheel 7 for the peripheral speed to be suitable for grinding the large-diameter portion 1a of the work
  • the drive mechanism 12b controls the speed of rotation of the small-diameter portion grinding wheel 8 for a suitable peripheral speed for grinding the small-diameter portion of the work.
  • FIG. 12 A mechanism to control the peripheral speeds of the large- and small-diameter portion grinding wheels 7 and 8 will be explained below with reference to Figs. 12 and 13.
  • the drive mechanisms 12a and 12b shown in Figs. 6(A) and 6(B) are also shown in Figs. 12 and 13.
  • the reference numerals 12a1 and 12b1 denote AC servo motors, respectively, of which the speeds of rotation are controlled by a controller 32 and freely adjusted, as will be discussed later with reference to Fig. 13.
  • the diameters of the large- and small-diameter portion grinding wheels 7 and 8 are already known. Therefore, their peripheral speeds are controlled based on their speeds of rotation controlled by the controller 32.
  • the AC servo motor 12a in Fig. 13 drives the rotation of the large-diameter portion grinding wheel 7, while the AC servo motor 12b drives the rotation of the small-diameter portion grinding wheel 8.
  • the reference numeral 31 denotes a control panel at which the operator attending the centerless grind machine makes input of desired peripheral speeds for the large- and small-diameter portion grinding wheels, respectively.
  • the input peripheral speeds are converted to speeds of rotation of the AC servo motors 12a1 and 12b1, respectively, by a main controller 33, and supplied to peripheral speed controllers 32a1 and 32b1, respectively.
  • Output signals from the peripheral speed controllers 32a1 and 32b1 are supplied to amplifiers 32a2 and 32b2.
  • the AC servo motors 12a1 and 12b1 are rotated at speeds corresponding to the command signals given by the operator at the control panel 31.
  • the speeds of rotation of the AC servo motors 12a1 and 12b1 are detected by rotation-speed sensors (not shown) incorporated therein and fed back through the peripheral speed controllers 32a1 and 32b1, respectively, to the main controller 33.
  • the main controller 33 will automatically provide such a control that the feedback signals take values corresponding to the peripheral speeds supplied at the control panel 31.
  • peripheral speeds of the large- and small- diameter portion grinding wheels 7 and 8 are properly set primarily under the following three conditions:
  • the optimum peripheral speed meeting the above conditions has been empirically known as know-how.
  • preliminary grinding is done beforehand under several kinds of conditions (including the peripheral speed).
  • a stepped work is ground by a single-piece stepped grinding wheel 2.
  • the peripheral speed of the large-diameter portion of the stepped work and that of the small-diameter portion are unavoidably determined depending upon the diameters of the grinding wheel 2 (in particular, the peripheral speeds of the large- and small-diameter portions of the grinding wheel are proportional to the diameters of the large- and small-diameter portions, respectively, thereof). Therefore, the freedom of peripheral speed selection used to be rather limited. In the present invention, however, there is no such limited freedom of peripheral speed selection but the peripheral speeds of the large- and small-diameter portion grinding wheels can be freely selected individually.
  • the finished dimension of the large-diameter portion 1a of the work is adjusted according to the feed in the direction of arrow a by the regulating wheel 9.
  • the set position of the shoe 10 is so adjusted according to the finished dimension of the small-diameter portion 1b of the work that the feed in the direction of arrow b' of the small-diameter portion grinding wheel 8 is stopped at a position where the desired dimension is reached. Since the dimensions of the large- and small-diameter portions can be adjusted as mentioned above, the centerless grinding can be continuously done without replacement of the grinding wheels even when the specifications of the work (diameters of its large- and small-diameter portions) are changed.
  • the replacement can be done with the large-diameter portion grinding wheel 7 moved in the direction of arrow c until it is separated from the small-diameter portion grinding wheel 8. Since the large-diameter portion grinding wheel 7 can be moved axially (in the direction of arrow c ), the centerless grinding can be easily done even in case the large-diameter portion of the stepped work is longitudinally separate from the small-diameter portion.
  • Figs. 14 and 15 show an arrangement in which the large-diameter portion grinding wheel 7 is moved axially and radially as driven by the motors.
  • Fig. 14 is a plan view schematically showing the mechanism for driving the large-diameter portion grinding wheel 7 axially and radially as driven by the motors
  • Fig. 15 is a front view of the same.
  • three axes X, Y and Z perpendicular to each other are assumed as shown.
  • the X-axis indicates the radial direction of the grinding wheels and the Y-axis indicates the axial direction of them.
  • the grinding machine according to the present invention has a bed 41 on which Y-directional slide ways 41a and 41b are fixed to guide a Y-directional slide table 42 in the Y-direction.
  • X-directional slide ways 42a and 42b are fixed on the Y-directional slide table 42 to guide an X-directional slide table 43 in the X-direction. Further, the X-directional slide table 43 has mounted thereon a rotation drive unit 44 (composed of a drive motor and reduction gear) supporting the large-diameter portion grinding wheel 7.
  • the bed 41 has provided thereon a Y-directional drive servo motor 46 to drive a feed screw 48 by means of a reduction gear 47.
  • the Y-directional slide table 42 is reciprocated in the Y-direction by the feed screw 48.
  • the Y-directional slide table 42 has provided thereon an X-directional drive servo motor 49 which drives a feed screw 51 by means of a reduction gear 50.
  • the feed screw 52 thus reciprocates the X-directional slide table 43 in the X-direction.
  • the Y-directional drive servo motor 46 and X-directional drive servo motor 49 are operated to freely move the large-diameter portion grinding wheel 7 in the horizontal plane.
  • Figs. 14 and 15 show a mechanism to drive the large-diameter portion grinding wheel in the X and Y planes. Similarly, the small-diameter portion grinding wheel and the regulating wheel can also be freely moved under control in the X and Y planes.
  • Fig. 7(B) shows the axial section of a blank used to make the bush shown in Fig. 7(A).
  • the grinding allowance is indicated as smudged.
  • the radius R' of the rounding of the flank is 6 mm, and the material of the flank is a cold forged carbon steel for structural use.
  • the reference numeral 8' in Figs. 8(A) to 8(C) denotes a grinding wheel for the small-diameter portion
  • 7' denotes a grinding wheel for the large-diameter portion.
  • the large-diameter portion of the product in this example has two steps of ⁇ 2 (26 mm) and ⁇ 3 (36 mm). So the large-diameter portion grinding wheel 7' takes the form of a stepped cylinder. Also in this arrangement, the large-diameter portion grinding wheel 7' and the small-diameter portion grinding wheel 8' are controllable in peripheral speed independently of each other, and the small-diameter portion grinding wheel 8' can be moved radially independently. It means that this arrangement is included in the technical range of the centerless grinding machine according to the present invention. Namely other than the arrangement shown in Figs. 8(A) to 8(C) is the same as or similar to the grinding machine shown in Figs. 3 and 4.
  • the grinding by the large-diameter portion grinding wheel 7' is started at the portion indicated with ⁇ 3 while the regulating wheel 9' is forwarded in the direction of arrow a .
  • the large-diameter portion grinding wheel 7' is moved, by traversing, in the direction of arrow c' to grind the portion R and also the portion indicated with ⁇ 3 as the regulating wheel 9' is moved in the direction of arrow a .
  • the reaction of the traversing in the direction of arrow c' is born by a stopper 210.
  • the small-diameter portion grinding wheel 8' is fed radially (in the direction of arrow b' ) to grind an end face Td at the stepped portion of work.
  • a stepped work to be ground has a large-diameter portion 1a, a small-diameter portion 1b and a conical portion 1c which joins the large- and small-diameter portions 1a and 1b, as shown in Fig. 9(A).
  • the large-diameter portion 1a of the work is ground by the large-diameter portion grinding wheel 7 while the small-diameter portion 1b and the conical portion 1c are ground by the small-diameter portion grinding wheel 8. Since the grinding wheels 7 and 8 are controlled in speed of rotation independently of each other, their speeds of rotation are different from each other.
  • the large-diameter portion grinding wheel 7 is so rotated and controlled as to have an optimum peripheral speed for the centerless grinding of the large-diameter portion 1a of the stepped work
  • the small-diameter portion grinding wheel 8 is also so rotated and controlled to have an optimum peripheral speed for the centerless grinding of the small-diameter portion 1b.
  • the speeds of rotation of the grinding wheels 7 and 8 are necessarily different from each other. Therefore, the grinding wheels 7 and 8 cannot be put into close contact with each other but a slight clearance must be secured between them.
  • Fig. 9(B) is an enlarged-in-scale detail view of the portion B in Fig. 9(A). As seen, since a clearance g must be provided between the large- and small-diameter portion grinding wheels 7 and 8, a portion 1d will remain unfinished.
  • Figs. 9(A) and 9(B) show the centerless grinding of a stepped work having the large-diameter portion 1a and small-diameter portion 1b with the conical portion 1c between them.
  • This is the case, for example, for centerless grinding of a blank for a drill.
  • the shank has portions of, for example, 6 mm, 8 mm and 10 mm in diameter with a difference of 2 mm in diameter between the adjoining portions.
  • Figs. 9(A) and 9(B) show the centerless grinding of a work having a conical portion which joins the large- and small-diameter portions of the work.
  • a similar unfinishing will also take place if the apex angle of the conical portion has a maximum extreme value of 180°, that is, if the boundary between the large- and small-diameter portions 1a and 1b is a stepped face perpendicular to the axis.
  • This problem of unfinishing at a portion between the boundary between the large- and small-diameter portions is unavoidable unless the grinding wheels 7 and 8 can be put into close contact with each other since there is a difference in speed of rotation between them.
  • Fig. 10(A) shows the step of preparation for the centerless grinding.
  • the work 1 is pushed by an insertion arm in the direction of arrow j and inserted into place.
  • the large-diameter portion grinding wheel 7 is opposite to the regulating wheel 9.
  • the small-diameter portion grinding wheel 8 is opposite to the shoe 10 which is disposed on the slide base (not shown) on which the regulating wheel 9 is also provided.
  • Fig. 10(B) shows the start of in-feed grinding by the large-diameter portion grinding wheel 7 and the regulating wheel 9.
  • the feed angle of feeding of the regulating wheel 9 at the in-feed grinding is on the order of 10' to 20'. It is set about 1° in this embodiment in order to provide a relatively large feeding force in the process step (in Fig. 10(E)) as will be further discussed later.
  • the work 1 is laterally stationary with the feeding force toward the left of the drawing supported by the insertion arm 15.
  • the large-diameter portion 1a of the work 1 is ground by the grinding wheel 7 which is forwarded by the regulation wheel 9 which is fed in the direction of arrow k as the grinding progresses.
  • the shoe 10 disposed on the slide base on which the regulating wheel 9 is also provided is fed in the direction of arrow k' parallel to the direction of arrow k .
  • the grinding wheel 8 When the grinding of the large-diameter portion 1a has become stable, the grinding wheel 8 is fed in the direction of arrow m as shown in Fig. 10(C) and the centerless grinding of the small-diameter portion 1b supported by the shoe 10 is started. During the grinding of the small-diameter portion 1b, the conical portion 1c is also ground by the small-diameter portion grinding wheel 8. An unfinished portion 1d will result as shown in Fig. 10(C) while the large-diameter portion 1a, small-diameter portion 1b and conical portion 1c are progressively ground.
  • the small-diameter portion grinding wheel 8 is retreated in the direction of arrow n and the insertion arm 15 is also retreated in the direction of arrow q , as shown in Fig. 10(D).
  • the large-diameter portion 1a of the work 1 receives the force in the direction of arrow q' because of the feed angle of the regulating wheel 9 so that it is continuously fed in a same direction, and thus the unfinished portion 1d is removed by through-feed grinding.
  • Fig. 10(E) shows the work from which the unfinished portion 1d has been removed.
  • Figs. 10(A) to 10(E) The application shown in Figs. 10(A) to 10(E) is the case that the large- and small-diameter portions 1a and 1b are joined together by the conical portion 1c.
  • This centerless grinding illustrated here can be applied irrespective of the magnitude of the apex angle of the conical portion 1c.
  • the maximum extreme apex angle of the conical portion 1c is 180° and the step face is perpendicular to the axis of the work.
  • Figs. 11(A) to 11(D) schematically show an example grinding in which the present invention is applied to a centerless grinding of a work having portions stepped perpendicularly to the axis thereof.
  • Fig. 11(A) shows the grinding step at which the large-diameter portion grinding wheel 7 and the regulating wheel 9 start the in-feed grinding of the work 1 at the large-diameter portion 1a.
  • This step corresponds to that in Fig. 10(B).
  • the work in the application shown in Fig. 10 is a blank for a drill.
  • the small-diameter portion 1b of the work is pointed and back-tapered.
  • the work in the application shown in Fig. 11 is a simply stepped one having a small-diameter portion 1b not back-tapered and pointed at the end thereof.
  • the large-diameter portion grinding wheel 7, regulating wheel 9, small-diameter portion grinding wheel 8, shoe 10 and insertion arm 15, the major components of the centerless grinding machine in this application, are similar to those in the precedent application.
  • the small-diameter portion 1b is supported by the shoe 10 as shown in Fig. 11(B), the shoe 10 itself is fed in the direction of arrow k' to feed the small-diameter portion grinding wheel 8 in the direction of arrow m for centerless grinding of the small-diameter portion 1b.
  • the step face 1e of the stepped work 1 is ground and finished.
  • the grinding wheel 8 is retreated in the direction of arrow n as shown in Fig. 11(C).
  • a portion 1d remains unfinished.
  • the insertion arm 15 is retreated in the direction of arrow q , a feeding force in the direction of arrow q' is applied to the work 1 which will thus be fed in the same direction, whereby the unfinished portion 1 is removed by through-feed grinding.
  • Fig. 11(D) shows the work from which the unfinished portion has been removed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP92121912A 1991-12-26 1992-12-23 Spitzenloses Schleifverfahren und spitzenlose Schleifvorrichtung für Stufenwerkstück Withdrawn EP0548957A1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP344232/91 1991-12-26
JP34423291 1991-12-26
JP48649/92 1992-03-05
JP4864992A JP2654301B2 (ja) 1992-03-05 1992-03-05 段付加工物のセンターレス研削方法
JP317240/92 1992-11-26
JP4317240A JPH05228810A (ja) 1991-12-26 1992-11-26 段付き加工物のセンターレス研削方法、及び同装置

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EP0548957A1 true EP0548957A1 (de) 1993-06-30

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940685A1 (de) * 1999-08-27 2001-03-01 Mikrosa Werkzeugmaschinen Gmbh Verfahren zum spitzenlosen Schräg-Einstechschleifen und Schleifmaschine
DE10126796A1 (de) * 2001-06-01 2002-12-19 Junker Erwin Maschf Gmbh Verfahren und Vorrichtung zum spitzenlosen Rundschleifen
US6986702B2 (en) * 2002-04-03 2006-01-17 Nsk Ltd. Centerless grinding apparatus and centerless grinding method
CN101596691B (zh) * 2009-04-23 2012-12-05 贵州航天精工制造有限公司 一种沉头零件的无心磨削方法及装置
CN103921182A (zh) * 2013-01-11 2014-07-16 光洋机械工业株式会社 用于无心磨削锥面边缘的方法和装置
CN115870819A (zh) * 2022-12-02 2023-03-31 哈尔滨工业大学 一种磨削硬脆材料小直径圆柱工件的装置及磨削方法

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JPS54152295A (en) * 1978-05-22 1979-11-30 Ntn Toyo Bearing Co Ltd Centerless grinding machine
JPS5871052A (ja) * 1981-10-19 1983-04-27 Hitachi Ltd 心なし研削盤
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DE10126796C5 (de) * 2001-06-01 2011-01-20 Erwin Junker Grinding Technology A.S. Verfahren und Vorrichtung zum spitzenlosen Rundschleifen
US6986702B2 (en) * 2002-04-03 2006-01-17 Nsk Ltd. Centerless grinding apparatus and centerless grinding method
US7189144B2 (en) 2002-04-03 2007-03-13 Nsk Ltd. Centerless grinding apparatus and centerless grinding method
CN101596691B (zh) * 2009-04-23 2012-12-05 贵州航天精工制造有限公司 一种沉头零件的无心磨削方法及装置
CN103921182A (zh) * 2013-01-11 2014-07-16 光洋机械工业株式会社 用于无心磨削锥面边缘的方法和装置
CN103921182B (zh) * 2013-01-11 2017-10-31 光洋机械工业株式会社 用于无心磨削锥面边缘的方法和装置
CN115870819A (zh) * 2022-12-02 2023-03-31 哈尔滨工业大学 一种磨削硬脆材料小直径圆柱工件的装置及磨削方法

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