US3535826A - Template-controlled tool grinding machines - Google Patents

Template-controlled tool grinding machines Download PDF

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Publication number
US3535826A
US3535826A US697142A US3535826DA US3535826A US 3535826 A US3535826 A US 3535826A US 697142 A US697142 A US 697142A US 3535826D A US3535826D A US 3535826DA US 3535826 A US3535826 A US 3535826A
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United States
Prior art keywords
grinding
template
tip
face
turning tool
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Expired - Lifetime
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US697142A
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English (en)
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Karl Hertel
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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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/34—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of turning or planing tools or tool bits, e.g. gear cutters

Definitions

  • the invention relates to improvements in template-con trolled tool grinding machines using a face grinder and a tool-carrying, removable swivel arm with a template.
  • the invention more specifically, provides an improvement in grinding machines of a type similar to the machine disclosed in US. Pat. No. 2,231,217.
  • a swivel arm is pivoted by means of a ball joint at one end to an adjusting arm and carries at its other end a template engageable with a bearing plane face carried by the adjusting arm.
  • the tool to be ground is carried by the swivel arm at a position between the ball joint and the template for engagement with the face of a grinding wheel when the template engages the bearing plane.
  • the adjusting arm is pivotable relative to the grinding disc about an axis extending parallel with the grinding plane and perpendicular to the line of alignment between the centres of the ball joint and the bearing plane.
  • turning tools can be ground with accurately adjustable nose, rake and clearance angles.
  • the nose angle is determined by the nose angle of the working template connected with the swivel arm.
  • the angle of rake of the workpiece to be ground is determinable by means of its position in the clamping device of the swivel arm, whereas in the case of the fixed bearing plane aligned perpendicular to the centre point of the ball joint, the dimension of the clearance angle to be ground on the turning tool corresponds to the angular position between the grinding plane and the grinding arm when the working template tip bears against the bearing plane.
  • the turning tool to be ground is clamped, externally of the machine, in a separate clamping template in the swivel arm.
  • the known copying face grinding machine has the disadvantage that, for the grinding of varying nose radii on the turning tool, it is necessary to have, in every case, a separate working template having a corresponding tip radius at its tip.
  • a set of working templates having varying nose or tip angles is inadequate.
  • the present invention is based on the problem of how to eliminate this disadvantage in such manner that, with a predetermined nose angle, using a single working template, any desired nose radius may be ground on the turning tool in accurately adjustable manner.
  • a copying face grinding machine for the grinding of a turning tool comprising means for supporting a grinding wheel for rotation with its face in a vertical grinding plane, an adjusting arm rigidly connecting a ball joint and a bearing plane, the bearing plane and the centre of the ball joint lying in a common plane, a swivel arm having one end mounted on the ball joint and adapted to carry at the other end a working template having the nose angle of the tool to be ground and engageable with the bearing plane, means for clamping a tool to be ground to the swivel arm, means supporting the adjusting arm for pivotal adjustment about a horizontal axis extending parallel to the grinding plane and perpendicular to the line of alignment joining the centres of the bearing plane and the ball joint, and means for adjusting the spacing between the grinding plane and the centre of the line of alignment.
  • the point of intersection between the alignment line of the bearing face and the ball joint centre point and the turning tool surface coincides exactly with the nose of the turning tool and intersects the grinding plane at the height of. the pivoting axis of the grinding disc
  • the abovemcntioned line of alignment coincides with the centre point of the rounded portion of the nose or of the nose radius and intersects the grinding plane only below the pivoting axis of the grinding disc.
  • the spacing adjusting device is provided with an indicating scale indicating the degree of the said spacing, then, with the aid of the said indicating scale and without changing the working template, any desired nose radius may be provided, with maximum accuracy, on the turning tool to be ground.
  • the ground turning tool nose is, theoretically, without any nose radius.
  • the point of intersection of the line of alignment between the ball point centre point and the tip of the working template with the imaginary pivoting axis of the adjusting arm is marked by a marking indicator arranged on the latter. Due to this preferred feature of the invention, it becomes unnecessary to clamp or adjust the turning tool to be ground on the swivel arm in a separate adjustment template. Thus, due to the provision of the marking indicator, the centre point of the nose radius to be ground on the turning tool is accurately indicated. The indication serves the setter of the turning tool to be ground as a criterion for the degree by which he must allow the nose of the turning tool to be ground to project in the direction towards the grinding disc.
  • a machine slide 4 is mounted for longitudinal displacement in the direction of the arrow 5.
  • the longitudinal displaceability in the direction of the arrow 5 is in a direction parallel to the rotational axis 6 of the shaft 2 and grinding disc 3.
  • a C-shaped adjusting arm 8 is arcuately displaceable in the direction of the arrow 9 in a slideway 7.
  • the adjusting arm 8 is lockable in various displacement positions relatively to the slide 4.
  • the adjusting arm 8 is provided with a ball-joint ball 10 on the inside of its lower C-limh and carries a bearing plane 11 at the free end of its upper C-limb.
  • the hearing or abutment plane 11 is so aligned that there extends in it, both an alignment line 12 passing through its centre point b and extending through the centre point c of the ball-joint 10 and a horizontal line 15 extending parallel to a horizontal (axis 26) through the end face 14 of the grinding disc 3, a right-angle 13 being enclosed between the lines 12 and 15.
  • the ball-joint ball 10 serves for the pivoted mounting of a swivel arm 16, the lower end 17 of which embraces the ball-joint ball 10 in the manner of a ball socket.
  • the swivel arm 16 is provided at its upper end 18 with a. receiving device (described later), for a working template 19.
  • the forward end 20 of the working template 19 projects in the direction towards the bearing plane 11 and is there provided with a nose or tip 21, the nose or tip angle 22 of which corresponds to the tip angle 24 desired on the turning tool 23 to be ground.
  • the turning tool 23 to be ground is so clamped in the central zone of the swivel arm 16 that its tip 25 extends in the direction towards the end face 14 of the grinding disc 3.
  • the pivot axis for a pivoting movement of the adjusting arm 8 relatively to the slide 4 is formed by an axis 26 extending at right angles 27 to the line of alignment 12 and at right angles 27' to the grinding disc axis 6.
  • the point of intersection between these imaginary pivot axes 26 and the line of alignment 12 is designated a in the drawings. It exactly halves the distance between the two points b and c firmly connected together by means of the adjusting arm 8.
  • the point a is, in the drawings, also the centre point of the arc of a circle on which the slideway 7 is disposed.
  • the turning tool 23 is secured in a clamping device or holder 29 approximately in the centre zone of the swivel arm 16.
  • the bearing faces 30, 31, provided in the clamping device 29, for the turning tool 23 are aligned to correspond to the angle of rake, to be ground on the turning tool 23.
  • the clamping of the turning tool 23 within the swivel arm 16 is elfected, in the case of the example of embodiment, by clamping fast (in a manner not described in detail) relatively to a support block 32 which is drawn, in the direction of the arrow 33, against an abutment 34 fast on the swivel arm.
  • the marking indicator 36 projects in the direction towards the end face 14 of the grinding face 3 and is angled downwardly to such an extent that its tip 37 ends at point a. Thus, it serves for indicating the point at, Le. the point of intersection between the pvot axis 26 for the adjusting arm 8 and the line of alignment 12 between the bearing plane 11 and the ball-joint ball 10.
  • the marking indicator 36 is adapted to be withdrawn out of its indicating position (FIGS. 2 and 3) in the direction towards the swivel arm 16 and its tip 37 is adapted to be pivoted upwardly out of the zone of the grinding disc 3 (shown in broken lines in FIGS. 2 and 3).
  • Stop means comprising a stop 36 are provided for limiting movement of the marking indicator 36 in the direction towards the grinding disc end free 14 in such manner that the free end of the tip 37 of the marking indicator 36 projects, in this boundary position, into the line of alignment 12 between the points b and c of the bearing plane 11 and the balLjoint ball 10, respectively, and is positioned at the height of the point a.
  • the working template 19 secured at the upper end 18 of the swivel arm 16 is secured, in a recess 35, accurately fixing its alignment, by means of a knurled screw 38. Its length between the rear abutment face 39 and the forward tip 21 corresponds exactly to the length of a nut gauge serving for adjustment of the zero position of the slide 4 relatively to the grinding disc 3 after the drawingaway of the grinding disc end face 14 or after changing the grinding disc 3.
  • the nut gauge (not shown) fits accurately into the receiving groove for the working template 19, at the upper end 18 of the swivel arm 16. Its tip angle may be larger than that of a working template and it may in particular, be 90.
  • the tip 21 of the working template 19 has no nose radius. It is so aligned that, when it abuts in the abutment plane 11, it is exactly at a tangent to the alignment line 12 or extends therein, at the height of the point b.
  • the slides 4 are first of all adjusted to a displacement of mm. and the adjusting arm 8 is adjusted to the desired clearance angle.
  • the slide 4 is provided on a lateral edge with a marking 42 and, opposite this said marking 42, the slideway 1 is provided with a length-measurement scale 43. Due to the marking 42 and the length-measurement scale 43, the displacement between the slide 4 and the slideway 1 may be accurately read off and adjusted.
  • the adjusting arm 8 For adjusting the clearance angle to be ground on the turning tool 23, the adjusting arm 8 is displaced in such manner relatively to the slide 4, in the zone of the slideway 7, that the line of alignment 12 has the angular position corresponding to the desired clearance angle relatively to the grinding disc surface 14.
  • the marking 44 and on the other hand there is provided in the zone of the slideway 7, between the adjusting arm 8 and the slide 4, on the one hand the marking 44 and on the other hand a scale 45 calibrated in angular degrees.
  • the turning tool 23 is clamped in the clamping device on the swivel arm 16 and, as this is done, its nose is pushed beyond the tip 37 of the marking indicator 36 or beyond the line of alignment 12 in the direction towards the grinding disc 3 for a distance corresponding to the amount of material to be ground off in its noze zone during the grinding operation. Then, the cutting member 23 is clamped fast in the swivel arm 16 and the marking indicator 36 is withdrawn into its starting position.
  • FIG. 2 shows the reciprocal arrangement of the adjusting arm 8, the swivel arm 16 and the grinding disc 3, the illustration being diagrammatic.
  • the turning tool 23 to be ground is, with the same cutting-edge geometry as before, to exhibit a nose radius of more than zero, for example X mm.
  • the point a of the line of alignment 12 is no longer located in the grinding disc surface 14 but is also spaced relatively thereto by spacing X.
  • the tip 37 of the marking indicator 36 now no longer indicates, in the advanced, downwardly-pivoted position, the exact position of the turning tool nose after finish-grinding, but the centre point of the nose radius of the turning tool 23.
  • the turning tool 23 is, when it is clamped fast on the swivel arm 16, advanced to such an extent in the direction towards the grinding disc 3 that the ti thereof which is to be ground projects beyond the forward end of the tip 37 not only by the amount of the desired material-removal but additionally also by the amount of the nose radius X to be ground on the cutting body 23, in the direction towards the grinding disc.
  • the swivel arm 16 is pivoted to and fro about the ball-joint ball 10, in the manner previously described, and is meanwhile pressed in the direction towards the end face 14 of the grinding disc 3, then after a predetermined time, in addition to the nose angle 24 predetermined by the tip of the working template 19, the pre-set nose radius of X mm. is automatically adjusted on the turning tool 23.
  • a machine for the template-controlled grinding of the tip of cutting tools which machine has a grinding wheel with a planar grinding face, a generally C-shaped adjusting arm positioned astride said grinding face with one leg thereof having a ball pivot on one side of a work-reference point on the grinding face, the other leg having a template-abutment face on a symmetrically opposed side thereof, the leg with the ball pivot being linked to the slide of a lineal slideway over an arcuate slideway, the two slideway motions being so defined that the alignment axis which is formed by the ball pivot and the template-abutment face can be moved lineally in a direction parallel to the grinding wheel axis and tilted within the plane defined by the lineal motion of this axis around the point on said axis which is closest to the work reference point on the grinding face; the machine further having a removable swivel arm assembly of a generally C-shaped structural outline, one leg thereof having a ball socket for engagement with the ball pivot, the other leg thereof being adapted
  • a marking indicator as part of the swivel arm assembly for the visual determination of the distance between the alignment axis and the tool tip and for indicating the center of the radius to be ground on the tool tip;
  • (c) means to adjust and record the distance between the alignment axis as pointed out by the marking indicator and the work reference point on the grinding face, so that a predetermined distance set between the alignment axis and the work reference point produces a tip radius of equal size on the tool tip, the marking indicator pointing to the center of the radius.
  • marking indicator is retractably mounted in the swiv l arm assembly for movement away from the grinding References Cited face.
  • the 0 UNITED STATES PATENTS marking indicator is pivotably mounted in the swivel arm 2,231,217 2/1941 Oliver 5l--127 assembly for movement away from the tool. 2 574 5 6 11 1951 Oliver 5 27 5.
  • the marking indicator includes an adjustable stop which can 10 HAROLD D. WHITEHEAD, Primary Examiner be set to exactly determine the extended position of the

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Machine Tool Copy Controls (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US697142A 1967-01-17 1968-01-11 Template-controlled tool grinding machines Expired - Lifetime US3535826A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0061578 1967-01-17

Publications (1)

Publication Number Publication Date
US3535826A true US3535826A (en) 1970-10-27

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US697142A Expired - Lifetime US3535826A (en) 1967-01-17 1968-01-11 Template-controlled tool grinding machines

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US (1) US3535826A (es)
DE (1) DE1577373B1 (es)
ES (1) ES349358A1 (es)
FR (1) FR1556451A (es)
GB (1) GB1172046A (es)
SU (1) SU488386A3 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5154020A (en) * 1990-03-01 1992-10-13 Haruchika Precision Company Limited Spherical surface machining apparatus and transporting apparatus therefor
CN110769977A (zh) * 2017-04-28 2020-02-07 萨尔瓦尼尼意大利股份公司 研磨机
US11890683B2 (en) * 2014-11-24 2024-02-06 Sandvik Intellectual Property Ab Method of grinding a parting/grooving insert and a parting/grooving insert

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170091A (en) * 1977-07-05 1979-10-09 The Gleason Works Apparatus for resharpening cutting blades for gear cutting machine
RU2548877C2 (ru) * 2013-05-30 2015-04-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тульский государственный университет" (ТулГУ) Устройство для заточки взаимозаменяемых резцов

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2231217A (en) * 1939-02-06 1941-02-11 Edd C Oliver Machine for grinding tool bits
US2574586A (en) * 1946-10-11 1951-11-13 Genevieve R Oliver Tool-supporting device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552645A (en) * 1945-09-24 1951-05-15 Genevieve R Oliver Grinding machine
US2538532A (en) * 1945-12-03 1951-01-16 Genevieve R Oliver Grinding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2231217A (en) * 1939-02-06 1941-02-11 Edd C Oliver Machine for grinding tool bits
US2574586A (en) * 1946-10-11 1951-11-13 Genevieve R Oliver Tool-supporting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5154020A (en) * 1990-03-01 1992-10-13 Haruchika Precision Company Limited Spherical surface machining apparatus and transporting apparatus therefor
US11890683B2 (en) * 2014-11-24 2024-02-06 Sandvik Intellectual Property Ab Method of grinding a parting/grooving insert and a parting/grooving insert
CN110769977A (zh) * 2017-04-28 2020-02-07 萨尔瓦尼尼意大利股份公司 研磨机
CN110769977B (zh) * 2017-04-28 2022-07-05 萨尔瓦尼尼意大利股份公司 研磨机

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Publication number Publication date
ES349358A1 (es) 1969-04-01
SU488386A3 (ru) 1975-10-15
GB1172046A (en) 1969-11-26
FR1556451A (es) 1969-02-07
DE1577373B1 (de) 1970-06-25

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