EP0181104A2 - Cup-type grinding wheel - Google Patents
Cup-type grinding wheel Download PDFInfo
- Publication number
- EP0181104A2 EP0181104A2 EP85307436A EP85307436A EP0181104A2 EP 0181104 A2 EP0181104 A2 EP 0181104A2 EP 85307436 A EP85307436 A EP 85307436A EP 85307436 A EP85307436 A EP 85307436A EP 0181104 A2 EP0181104 A2 EP 0181104A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- grinding
- cup
- stock
- axis
- 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- Withdrawn
Links
- 230000000694 effects Effects 0.000 claims description 5
- 239000003082 abrasive agent Substances 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/02—Wheels in one piece
Definitions
- the present invention relates to a cup-type grinding wheel which is used for surface grinding.
- a surface grinding operation is known which is performed by passing workpieces 2, 2' to be ground under a rotating cup wheel 1 along an arcuate path as illustrated in Fig. 4. It is also known to effect another surface grinding operation as illustrated in Fig. 5, wherein the workpiece 2 to be ground is kept in one position and rotated about its own axis - as indicated by arrow 3. Although the first mentioned grinding operation is more frequently utilised, the latter operation is sometimes advantageous - depending upon the purpose of the working operation. In the operation as illustrated in Fig. 5 it is necessary to locate the axis of rotation 4 of the rotating of the workpiece 2 to be ground in the width W of an annular-shaped acting surface 5 of the wheel 1 as shown in Fig. 6.
- a central portion of the workpiece surface 2 to be ground is left unground corresponding to the inside of a circle 6 with a radius corresponding to a spacing R.
- a grinding wheel tends to wear due to effect of the grinding operation and the whole acting surfaoe of the wheel is not worn equally and it is the outer peripheral portion thereof which is worn to a greater extent. Because of the foregoing effect of wear, the acting surface assumes a oonical shape (each wall portion slanting in section) as indicated by reference numeral 17 of Fig. 8.
- Fig. 8 illustrates the relationship between a wheel and a workpiece to be ground, wherein a workpieoe 12 to be ground, is placed on a rotary table 19 and an annular grinding body 11 is fixed to a' wheel stock 18 (or wheel mounting plate or body) thus forming a cup-type wheel. Whilst being shown in a somewhat exaggerated manner, the lower, acting surface of the grinding body is worn so as to have a conical shape as denoted by reference numeral 17. Although the rotary axis 21 of the workpieoe 12 to be ground passes through the central portion of an annular width W of the wheel, because of the effects of wear it assumes a relative positional relationship somewhat similar to that of Fig. 7 and as a result, a projection 20 is produced.
- a cup-type grinding wheel comprising an annular grinding body (11) mounted to the peripheral portion of a wheel stock (18) in such a manner as to be eccentric with respect to the rotary axis (22) of the wheel.
- a grinding machine including a oup-type grinding wheel as defined above, wherein said wheel is mounted to rotate about the axis of said wheel stock (18) and wherein mounting or support means for workpieces is located or locatable to rotate the workpieces about an axis which is cleared on opposite sides during the eccentric rotary action of the grinding body (11).
- FIG. 1 and 2 A cup-type grinding wheel according to the present invention is illustrated in Figs. 1 and 2 and as will now be described.
- an abrasive annular-shaped grinding body 11 (220 mm outer diameter and 2 mm width including a 230 mesh diamond powder in its resin bond) having a oentre 23 and which is eccentrically mounted on a wheel mounting plate, flange or stock 18.
- the abrasive grinding body 11 contains abrasives such as diamond, CBN or the like abrasive material.
- the eccentricity E i.e. the distance between oentre 23 of annular body 11 and the centre and axis of rotation 22 of stock 18, is set to be larger than the width W of the annular portion of the grinding wheel measured in a radial direction.
- a centre hole 24 is provided in the stock 18 for mounting the wheel on a machine spindle (not shown).
- the grinding body 11 Because of eccentricity of the grinding body 11, the grinding body 11 is caused to reciprocally grind between the left side 101 and the right side 101' of the rotary centre 21 of a workpiece 12 to be ground while travelling at a high speed in the circumferential direction as shown in Fig. 3. Accordingly, a projection, such as projection 20 shown in Fig. 8, is not produced.
- the annular-shaped grinding body is eccentrically mounted on the wheel stock having a coaxis with the non-eccentric rotary axis. Accordingly, since only the grinding body is eccentrically rotated, unbalancing of rotation is extensively small when compared with the previously mentioned eccentric rotation of the whole wheel. Thus, balancing can be easily recovered by an adequate balancing operation.
- the projection 20 is produced at the central portion of the grinding surface of the workpieoe 12 as shown in Fig. 9.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
- The present invention relates to a cup-type grinding wheel which is used for surface grinding.
- A surface grinding operation is known which is performed by passing
workpieces 2, 2' to be ground under a rotatingcup wheel 1 along an arcuate path as illustrated in Fig. 4. It is also known to effect another surface grinding operation as illustrated in Fig. 5, wherein theworkpiece 2 to be ground is kept in one position and rotated about its own axis - as indicated by arrow 3. Although the first mentioned grinding operation is more frequently utilised, the latter operation is sometimes advantageous - depending upon the purpose of the working operation. In the operation as illustrated in Fig. 5 it is necessary to locate the axis of rotation 4 of the rotating of theworkpiece 2 to be ground in the width W of an annular-shaped acting surface 5 of thewheel 1 as shown in Fig. 6. If the axis of rotation 4 is positioned out of the operating region of the annular wheel portion 5, as shown in Fig. 7, a central portion of theworkpiece surface 2 to be ground is left unground corresponding to the inside of acircle 6 with a radius corresponding to a spacing R. - Even if the operational conditions illustrated in Fig. 6 are satisfied, there still remains a minute projection at the central portion of the
workpiece surface 2. The height of the projection ranges from several microns to several tens of microns ( ji) which is very disadvantageous when the grinding operation is required to produce flatness. However, even if the grinding wheel and its related machinery are carefully fixed and adjusted, the projection cannot be prevented from arising. - Generally, a grinding wheel tends to wear due to effect of the grinding operation and the whole acting surfaoe of the wheel is not worn equally and it is the outer peripheral portion thereof which is worn to a greater extent. Because of the foregoing effect of wear, the acting surface assumes a oonical shape (each wall portion slanting in section) as indicated by
reference numeral 17 of Fig. 8. - Fig. 8 illustrates the relationship between a wheel and a workpiece to be ground, wherein a
workpieoe 12 to be ground, is placed on a rotary table 19 and anannular grinding body 11 is fixed to a' wheel stock 18 (or wheel mounting plate or body) thus forming a cup-type wheel. Whilst being shown in a somewhat exaggerated manner, the lower, acting surface of the grinding body is worn so as to have a conical shape as denoted byreference numeral 17. Although therotary axis 21 of theworkpieoe 12 to be ground passes through the central portion of an annular width W of the wheel, because of the effects of wear it assumes a relative positional relationship somewhat similar to that of Fig. 7 and as a result, aprojection 20 is produced. - As will be described, it is possible to eliminate the aforementioned disadvantage of resultant projection by arranging the wheel so that it executes eccentric rotation. Whilst this arrangement is also proposed wherein a conventional grinding wheel is modified so that the mounting flange has an eccentric rotary axis and is connected to the grindstone or wheel. Accordingly, since both the flange and wheel are eccentrically displaced, an undesirable degree of unbalancing is produced - especially if such wheel should be rotated at a high speed which would subject both the wheel and the machine to serious risk of damage. Thus, it is undesirable for this method of operation to be put into practice.
- It is an object of the present invention to provide a cup-type grinding wheel, wherein the above-mentioned disadvantage inherent in the prior art operations is eliminated and wherein no such undesirable central projection is formed on the workpiece.
- According to the present invention there is provided a cup-type grinding wheel comprising an annular grinding body (11) mounted to the peripheral portion of a wheel stock (18) in such a manner as to be eccentric with respect to the rotary axis (22) of the wheel.
- Also according to the present invention there is provided a grinding machine including a oup-type grinding wheel as defined above, wherein said wheel is mounted to rotate about the axis of said wheel stock (18) and wherein mounting or support means for workpieces is located or locatable to rotate the workpieces about an axis which is cleared on opposite sides during the eccentric rotary action of the grinding body (11).
- The invention will be described further, by way of example, with reference to the accompanying drawings, in which:-
- Fig. 1 is a vertical sectional front view of a cup-type grinding wheel according to one embodiment of the present invention;
- Fig. 2 is a plan view of the grinding wheel of Fig. 1;
- Fig. 3 is a fragmentary elevational view of a part of the grinding wheel of Figs. 1 and 2 shown in an operational arrangement thereof;
- Figs. 4 and 5 are schematic plan views illustrating two operating modes with different arrangements of the mounting relationship of a oup-type grinding wheel and a workpieoe to be ground;
- Figs. 6 and 7 are fragmentary schematic plan views illustrating the relationship between the wheel and workpieoe in the operating mode illustrated in Fig. 5;
- Fig. 8 is an elevational view showing the relationship between a wheel and a workpieoe to be ground with the hitherto, undesired central projection on the workpiece 'being shown;
- Fig. 9 is a surface roughness trace of the central portion of a workpieoe ground by a conventional wheel; and
- Fig. 10 is a surface roughness trace of a workpieoe ground with a grinding wheel according to the present invention and in the requisite operational mode.
- Referring to Figs. 1 and 2. A cup-type grinding wheel according to the present invention is illustrated in Figs. 1 and 2 and as will now be described.
- In the drawings there is illustrated an abrasive annular-shaped grinding body 11 (220 mm outer diameter and 2 mm width including a 230 mesh diamond powder in its resin bond) having a
oentre 23 and which is eccentrically mounted on a wheel mounting plate, flange orstock 18. Theabrasive grinding body 11 contains abrasives such as diamond, CBN or the like abrasive material. The eccentricity E, i.e. the distance betweenoentre 23 ofannular body 11 and the centre and axis ofrotation 22 ofstock 18, is set to be larger than the width W of the annular portion of the grinding wheel measured in a radial direction. Acentre hole 24 is provided in thestock 18 for mounting the wheel on a machine spindle (not shown). - Because of eccentricity of the
grinding body 11, thegrinding body 11 is caused to reciprocally grind between theleft side 101 and the right side 101' of therotary centre 21 of aworkpiece 12 to be ground while travelling at a high speed in the circumferential direction as shown in Fig. 3. Accordingly, a projection, such asprojection 20 shown in Fig. 8, is not produced. - Since the grinding body is displaced relatived to the axis of rotation of the
stock 18 and mounting spindle, the rotary balance of the wheel is lost. However, balance of the wheel can be recovered by suitable means such as a balance weight. In the case where the wheel has a relatively small grinding width W with respect to the outer diameter, since the grindingbody 11 is relatively light with respect to the weight of thewheel stock 18, no disadvantage should arise in performing a usual balancing operation as it is. - According to the present invention, the annular-shaped grinding body is eccentrically mounted on the wheel stock having a coaxis with the non-eccentric rotary axis. Accordingly, since only the grinding body is eccentrically rotated, unbalancing of rotation is extensively small when compared with the previously mentioned eccentric rotation of the whole wheel. Thus, balancing can be easily recovered by an adequate balancing operation.
- When a conventional grinding wheel is used, the
projection 20 is produced at the central portion of the grinding surface of theworkpieoe 12 as shown in Fig. 9. However, when the grinding wheel according to the present invention is used with an eccentricity of, for example, E = 2.5 mm, roughness of the surface becomes extremely good around the central area of the work, and no projection is produced at all - as represented in Fig. 10.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23282684A JPS61111887A (en) | 1984-11-05 | 1984-11-05 | Cup shaped grinding stone |
JP232826/84 | 1984-11-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0181104A2 true EP0181104A2 (en) | 1986-05-14 |
EP0181104A3 EP0181104A3 (en) | 1988-08-24 |
Family
ID=16945384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85307436A Withdrawn EP0181104A3 (en) | 1984-11-05 | 1985-10-16 | Cup-type grinding wheel |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0181104A3 (en) |
JP (1) | JPS61111887A (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE804762C (en) * | 1948-10-02 | 1951-04-30 | Krusius Geb | Device for sharpening the blades of knives u. like |
DE1777089A1 (en) * | 1968-09-04 | 1971-04-01 | Winter & Sohn Ernst | Face grinding wheel |
DE1652901A1 (en) * | 1967-09-14 | 1971-04-29 | Indiam Diamantwerkzeugfabrikat | Grinding wheel |
DE2026903A1 (en) * | 1970-06-02 | 1971-12-16 | J Konig + Co oHG, Werkzeugfabrik, 7500 Karlsruhe | Sanding pads for hand sanders |
FR2361195A1 (en) * | 1976-08-14 | 1978-03-10 | Mueller Georg Kugellager | SURFACE RECTIFICATION PROCESS AND CORRESPONDING APPARATUS |
FR2535640A1 (en) * | 1982-11-09 | 1984-05-11 | Lignes Telegraph Telephon | Diamond-impregnated grinding wheel and its use. |
-
1984
- 1984-11-05 JP JP23282684A patent/JPS61111887A/en active Pending
-
1985
- 1985-10-16 EP EP85307436A patent/EP0181104A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE804762C (en) * | 1948-10-02 | 1951-04-30 | Krusius Geb | Device for sharpening the blades of knives u. like |
DE1652901A1 (en) * | 1967-09-14 | 1971-04-29 | Indiam Diamantwerkzeugfabrikat | Grinding wheel |
DE1777089A1 (en) * | 1968-09-04 | 1971-04-01 | Winter & Sohn Ernst | Face grinding wheel |
DE2026903A1 (en) * | 1970-06-02 | 1971-12-16 | J Konig + Co oHG, Werkzeugfabrik, 7500 Karlsruhe | Sanding pads for hand sanders |
FR2361195A1 (en) * | 1976-08-14 | 1978-03-10 | Mueller Georg Kugellager | SURFACE RECTIFICATION PROCESS AND CORRESPONDING APPARATUS |
FR2535640A1 (en) * | 1982-11-09 | 1984-05-11 | Lignes Telegraph Telephon | Diamond-impregnated grinding wheel and its use. |
Also Published As
Publication number | Publication date |
---|---|
EP0181104A3 (en) | 1988-08-24 |
JPS61111887A (en) | 1986-05-29 |
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Effective date: 19900321 |
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Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19901002 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: NISHIO, KIYOSHI Inventor name: KOBAYASHI, SHOJI |