US3840357A - Rotary grinding wheel and its method of manufacturing - Google Patents

Rotary grinding wheel and its method of manufacturing Download PDF

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Publication number
US3840357A
US3840357A US00275702A US27570272A US3840357A US 3840357 A US3840357 A US 3840357A US 00275702 A US00275702 A US 00275702A US 27570272 A US27570272 A US 27570272A US 3840357 A US3840357 A US 3840357A
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Prior art keywords
grinding wheel
rotary grinding
fabric
layers
wheel according
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Expired - Lifetime
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US00275702A
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English (en)
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Y Shimizu
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece
    • B24D5/04—Wheels in one piece with reinforcing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels

Definitions

  • a rotary grinding wheel which comprises a plurality of interconnected grinding layers and a pair of reinforcing fabrics applied to the outer surfaces of the grinding layers. The renewing action of the edge of the grinding layers occurs preferentially at the interface between the layers than in the remainder,
  • the invention relates to the art of a rotary grinding wheel, and more particularly to a rotary grinding wheel for cutting purposes and a method of manufacturing same.
  • a grinding wheel incorporating phenol resin or other thermosetting resin as a binder has a suitable resilience for its use with cutting purposes.
  • a rotary grinding wheel of such construction has a drawback that the cut surface of a workpiece is not formed straightforward because of the tendency for its edge to deviate from a predetermined path during the cutting operation.
  • Such drawback results from a high resilience of the rotary grinding wheel which is in turn caused to a large proportion by its construction.
  • a fresh grinding wheel has an edge which is at an angle of 90 with respect to its lateral sides, the edge becomes abraded to a rounded form (see FIG. 1) during use, which causes the above-mentioned tendency.
  • a disc-shaped rotary grinding wheel customarily comprises a reinforcing fabric embedded therein as a middle layer which prevents the self-dressing action at the edge from occurring uniformly along the thickness, with consequence that grains tend to fall off more rapidly adjacent to the sides than at the median region. This results in the formation of a leading top at the edge which is abraded to a rounded form. This increases the deviation problem referred to above, mainly because the leading top would not be constrained sufficiently to prevent it from running in a free direction.
  • an object of the invention to provide an improved rotary grinding wheel having an edge which is capable of cutting a workpiece along a straight path without deviation from a predetermined path during a cutting operation.
  • Another object of the invention is to provide a method to manufacture the improved rotary grinding wheel in an improved manner.
  • a rotary grinding wheel is constructed so that a plurality of leading tops will be formed in use which constrain each other to prevent one leading top to follow an arbitrary path so that the leading tops as a whole will be driven into a workpiece along a straight path.
  • the rotary grinding wheel comprises a plurality of interconnected grinding layers with their outer lateral sides covered with reinforcing fabrics such as cloths of glass fibre, for example, the respective grinding layers having boundary regions where they adjoin each other and at which the self-dressing action is to occur preferentially than the remainder.
  • FIG. 1 is a section of a conventional rotary grinding wheel for illustrating the abrasion of the .periphery with use together with improper paths in a workpiece followed by the grinding wheel;
  • FIG. 2 is a section of part of the rotary grinding wheel according to the invention.
  • FIG. 3 is a section of the rotary grinding wheel of the invention, illustrating the abrasion which occurs in the periphery thereof with use and illustrating, in phantom lines, the proper path which the grinding wheel follows;
  • FIG. 4 is a section of an apparatus suitable for use in manufacturing the rotary grinding wheel of the invention.
  • FIG. 5 is a section of part of a slightly modified rotary grinding wheel from that of FIG. 2;
  • FIG. 6 is a section of an apparatus suitable for use in manufacturing the rotary grinding wheel shown in FIG. 6.
  • a conventional rotary grinding wheel 1 which includes a reinforcing fabric 2 such as a cloth of glass fibre as a middle layer.
  • a reinforcing fabric 2 such as a cloth of glass fibre as a middle layer.
  • the presence of such a reinforcing fabric results in abrading the edge to a rounded form illustrated, thereby forming a leading 'top 3.
  • the edge of such a shape may lose its way asindicated by arrows rather than advancing through a'workpiece 4 on a line which is aligned wheel 1.
  • FIG. 3' The rotary grindingwheel constructed according to the invention is shown in FIG. 3', where it will be noted that the grinding wheel is covered with a pair of reinforcing fabrics 5a and 5b on its both lateral surfaces and includes therebetween a a pair of grinding layers 6a and 6b which are bonded together along an interface 7.
  • Each of the grinding layers 6a and 612 comprises grinding grains 8 and binder 9 (FIG.. 2) and is constructed in a similar manner, that is, with the same parosity, grain density and degree of bonding, even though pores are not shown in FIG. 2.
  • the two grinding layers 6a and 6b are not prepared integrally from the outset, but are bonded together after having been formed by separate compressure moulding operations.
  • the t vv o grinding layers6a and 6b comprise two compression moulding 'sintered together.
  • the grains 8 are bonded together by the binder 9 and hence engage or intermesh each other, there is no such engagement between the, grains in one of the grinding layers and the grains in the other at the interface 7, since the confronting surfaces of the both grinding layers which abut one another to define the interface are finished flat upon compression moulding.
  • An edge having a plurality of leading tops thus formed is effective to provide constraint upon the movement of the individual leading tops, which therefore are prevented from running in an arbitrary direction, the overall effect of the constraint being to drive the edge straightforward into the workpiece 4, as indicated in phantom lines in FIG. 3.
  • FIG. 4 shows an apparatus which is used in manufacturing the rotary grinding wheel of the invention.
  • the apparatus may be conventional, and'includes a mould l2 and a press member 13.
  • a compression moulding comprising a mixture of grains 8 and binder 9 and a reinforcing fabric 5 on one side of the mixture.
  • the mixture is uniformly laid within the mould l2 and then the reinforcing fabric 5 placed thereon, whereupon the assembly is compacted by means of the press member 13.
  • the procedure is similar to the usual practice except that no additional mixture is laid on top of the fabric 5.
  • the fabric 5 may be placed first on the bottom of the mould and then the mixture charged thereon. It will be understood that the compression moulding com prises the reinforcing fabric 5 tightly secured to one side of the mixture compact.
  • the method of manufacturing the rotary grinding wheel according to the invention includes a second step in which two of compression mouldings obtained by the first step are applied together with their reinforcing fabrics 5 located outside and are sintered together.
  • the parameters of the sintering may be chosen as usual such as, for example, at a heating temperature of about 200C for about 24 hours. It is to be noted that the sintering used in the prior art has been for a single compression moulding having a reinforcing fabric as a middle layer, while the sintering used in the method of the invention is characterized by bonding a pair of com pression mouldings together. In this mannena'grinding wheel having a plurality of grinding layers 6a and 6b is formed in accordance with the invention.
  • an additional compression moulding which comprises the mixture alone and'does not incorporate a reinforcing fabric may be interposed between the compression mouldings of the pair, Such additional moulding may be bonded with the other mouldings in the similar manner as abovementioned.
  • the grains are tightly thrusted into the tissue of the fabric, and are effective to minimize premature abrasion of the fabric which may be caused by its friction with the cut edge of a workpiece as the grinding wheel is driven-into a workpiece of substantial thickness.
  • premature abrasion of the reinforcing fabric can be minimized or eliminated in a slightly different form of the rotary grinding wheel shown'in FIG. 5.
  • the grains 8c and 80' project through the fabrics on both sides to form grinding surfaces 14 and 15, respectively.
  • FIG. 6 shows a modified apparatus suitable for manufacturing the grinding wheel shown in FIG. 5.
  • This apparatus is similar to that shown in FIG. 4 except that depressions 16 are formed in the bottom of the mould 12.
  • depressions 16 are formed in the bottom of the mould 12.
  • the sintering as abovementioned of two of such compression mouldings produces the improved rotary grinding wheel shown in FIG. 5.
  • the same result can be obtained by using a mouldv similar to that shown in FIG. 6 together with a modified press member 13 in which the depressions are formed. In this instance, the fabric is placed on top of the mixture of the grains 8 and binder 9 charged into the mould 12.
  • a rotary grinding wheel comprising a plurality of superposed mutually sintered together layers of grinding material, and a layer of reinforcing fabric secured by a thermosetting resin along each outerface of said wheel whereby self-dressing action occurs ina region adjacent to the interface between the layers and forms a plurality of outer leading edges during use.
  • each of said layers comprises a separate compressed moulding of grinding grains and a thermosetting resin binder, and said layers are sintered together.
  • each layer includes grinding grains and thermosetting resin binder, and said reinforcing fabrics are each secured to an adjacent layer by said thermosetting resin binder.
  • each ofsaid reinforcing fabrics has grains from I an adjacent one. of said layers projecting through the mesh thereof.
  • I I I 6 A' method of manufacturinga rotary grinding wheel comprising a first step of compression moulding a mixture of grinding grains and thermosetting resin binder to a thin disc shape on a reinforcing fabric, and a second step of applying together the fabric free faces of two of said compression mouldings obtained by the first step with their reinforcing fabric located only on the outside faces and sintering the assembly together without application of pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US00275702A 1971-08-27 1972-07-27 Rotary grinding wheel and its method of manufacturing Expired - Lifetime US3840357A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46065706A JPS5121197B2 (fr) 1971-08-27 1971-08-27

Publications (1)

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US3840357A true US3840357A (en) 1974-10-08

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US00275702A Expired - Lifetime US3840357A (en) 1971-08-27 1972-07-27 Rotary grinding wheel and its method of manufacturing

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US (1) US3840357A (fr)
JP (1) JPS5121197B2 (fr)
BE (1) BE787984A (fr)
CA (1) CA973364A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230461A (en) * 1977-09-29 1980-10-28 Eli Sandman Company Abrasive wheels
US4401442A (en) * 1978-10-18 1983-08-30 Daichiku Co., Ltd. High-speed disk grindstone and process for producing the same
US4504283A (en) * 1982-07-22 1985-03-12 Superior Finishers, Incorporated Cushioned abrasive articles, and method of manufacture
US6099394A (en) * 1998-02-10 2000-08-08 Rodel Holdings, Inc. Polishing system having a multi-phase polishing substrate and methods relating thereto

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5388289A (en) * 1977-01-13 1978-08-03 Youzou Shimizu Method of manufacturing rotary grinding machine
JPS54159489U (fr) * 1978-04-28 1979-11-07
JPS567684U (fr) * 1979-06-22 1981-01-23

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230461A (en) * 1977-09-29 1980-10-28 Eli Sandman Company Abrasive wheels
US4401442A (en) * 1978-10-18 1983-08-30 Daichiku Co., Ltd. High-speed disk grindstone and process for producing the same
US4504283A (en) * 1982-07-22 1985-03-12 Superior Finishers, Incorporated Cushioned abrasive articles, and method of manufacture
US6488570B1 (en) 1997-02-10 2002-12-03 Rodel Holdings Inc. Method relating to a polishing system having a multi-phase polishing layer
US6375559B1 (en) * 1997-03-28 2002-04-23 Rodel Holdings Inc. Polishing system having a multi-phase polishing substrate and methods relating thereto
US6099394A (en) * 1998-02-10 2000-08-08 Rodel Holdings, Inc. Polishing system having a multi-phase polishing substrate and methods relating thereto

Also Published As

Publication number Publication date
JPS5121197B2 (fr) 1976-06-30
CA973364A (en) 1975-08-26
JPS4833487A (fr) 1973-05-10
BE787984A (fr) 1972-12-18

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