SE435464B - SET AND NON-ROTABLE TOOLS FOR Sharpening a rotating grinding wheel - Google Patents

Description

1907161-9 multiple tips often allow greater cross-feed speeds than before enstensslzàl-papparater. in Although prior art sharpening tools are generally considered to be manufacturers, manufacturers are always keen to improve grinding for example, by improving the life of the discs, the cutting speed of the discs, the surface finish that with the help of the grinding wheel achieved on the workpiece as well as the life of the sharpening tool oda speeds. * Current sharpening theories "obscure" the grinding wheel assembly to achieve a smooth surface treatment '. This results in poor cutting disc that "burns" the object during grinding. It is desirable that the grinding wheel "both" are "refreshing" and can provide a smooth surface treatment. ling. "Free cutting" refers to the ability of a grinding wheel to fasten removing material from a work handlebar adr requires a low supply of cutting energy from the grinder. With current technology, however, it has not has been possible to meet the two criteria for free cutting and jäxnn. .treatment due to the alternative use for the remainder sharpening fabric. ' Accordingly, it is a basic feature of this invention that provide an aggravating effect which increases odn improves grinding procedure incm these recommendations.

Another basic feature of this llppfinr fi ng is to achieve one improved sharpening tools in particular are useful for sharpening grinding wheels to grind the work supports and to improve both the the cutting properties and the surface treatment properties.

The sharpening tool of the present invention comprises at least stone two bodies pressed by different powders which are placed on the tip of the fabric to abut tangentially against the rotating surface of a grinding wheel in order to grind the board and to mainly perpendicular to the rotating surface of the grinding wheel in order to cut the disc. With this art class, a double-acting sharpening is applied. The sequence in which the cutting and grinding is applied the disc can be varied depending on the desired results. The cutting the compact can be arranged at a negative, positive or zero chip angle.

In its broadest aspect, the present invention includes a method of sharpening according to which an abrasive loz-Qp is sequentially listened to 7907161-9 to grind and cut. The abrasive body can consist of composite compacts of diamond, cubic or so-called wurtzitic boron nitride or cluster ccmpacts, of a so-called "macle" diarrhea or hardline pine compacts.

Inventions: described in more detail below in connection with attached drawings, on which Fig. 1 is a perspective view of a double-acting sling action fabric according to the present invention, Figures 2A, 2B and 2C show fragmentary cross-sections taken along line AA in Fig. 1 and shows the cutting press body set in zero chip viz cell, positive chip vv cell and negative chip vir cell. Fig. 3 is a schematic view of the double-acting sharpening operation. the fabric it arzbringas rrot a Jcoterande grinding wheel, m Fig. 4 shows an alternative embodiment of an oscillating double-acting sharpening tools. Although this qzpfinning lean is performed in: many different forms are shown the figures and a suitable embodiment of the invention is described in detail below. invention, and modifications thereof, and in this context it should be It is stated that this description is to be considered as an exemplary invention of the invention. principles of the invention and is not intended to limit the invention to those embodiments scm are displayed.

A sharpening tool 10 according to this invention is shown in Fig. 1.

The tool 10 comprises a shank or resin part 12 and an end tip 14. Two composite compacts 16 and 18 supported by, are embedded attached to or otherwise attached to the tip 14 and extending out of there. The design of the shaft 3.2 and the end tip 14 is only illustrative and other forms well known in the art are likewise used only.

A group press body is defined as a grouping of abrasive particles bond together with each other either (1) to form a self-bond ratio, (2) by means of an adhesive which is arranged in a critical manner. the numbers or (3) using any combination of (l) and (2). The reference may be made to U.S. Pat. Nos. 3,136,615, 3,144,746 and 3,233,988 for a detailed description of particular types of presses bodies and Inet methods for their manufacture. ? 9óá1s1-9 raw A composite compact is defined as a group compact attached to. a raw material such as smtraa vain-menad. One ' to the base material can be formed either before or after the molding of group-press bodiesx. Reference may be made to the patent 3 74-5 623, 3 74-3 489 and 3 767 371 for a detailed description of certain types of assembled compacts and methods of their effect. in The term cemented carbide or sintered carbide refers to when used herein one or more unstable carbides of metals of groups IVb, Vb and vn »in the atomic number table vina. sinuáats or nmaits using one or more matrix metals selected from the group even, nickel and cobalt. An example of a cemented carbide is one that contains WC in one cobalt xtrate or TiC in a nickel matrix. in Each of the composite sleeves 16 and 18 'may include a base material IGA and 18A of cemented carbide and an abrasive pulp or an abrasive layer 166 and 183. The abrasive layer 16B may consists of an abrasive selected from the group consisting of diamond, cubic boron lithride (CBN), so-called wlLtzite borniiïid (WBN) and mixed two or more of these. Examples of suitable compounds compacts sold by General Electric Company go under iïñljazade designations: COMPAX® industrial diamond tools (polycrystalline tallirx diarruant on a cemented carbide material) w BZN compacts (CBN crystals on a cemented carbide base material).

The compact blank 16 has a relatively long end and is positioned with its abrasive layer 16B in a substantially vertical orientation, as shown in Fig. 1, while the blank 18 is shorter and is positioned with its abrasive layer 18B in a substantially horizontal orientation. The functions of the axes 16 and 18 are best understood with reference to Fig. 3 which shows the usual application of the tool 10 to the surface of a grinding wheel 20 rotating in the direction shown. The tool 10 for- moved in Uå directions namely in towards oda laterally over the disc 20 surface. The blank 16 acts to grind the grinding wheel and the blank 18 cuts in the grinding wheel.

The long blank 16 extends beyond the cantalone area with slip the disc as shown in Fig. 3. The influence of the long shaft 16 grinds where the grinding wheel thanks to the armrests. This effect breaks the sun- 19o7161-9 5 binder bridges in membrane sheets and exposes new abrasive barley as well as breaking existing exposed came. _ The short axis 18 is located on the engagement radius of the outer grinding wheel.

The short blank 18 cuts the grain of the disc and establishes an exact diameter for the grinding wheel and a "free-cutting" condition. The chip of the short term angle can be zero, positive or negative as shown in Figs. 2A, 2B respectively 2C. The rake angle refers to the engagement of the sharpening tool. angle with the grinding wheel measured from the chip surface as a reference plane. The chip surface to a sharpening tool is the tool surface against which chips from the grinding wheel collects when they are separated. At each alignment of the rake angle a leading abrasive edge of the blank 18 is substantially perpendicular to the blank 16 front grinding edge. In this way, the pressing body 16 is the working edge aligned substantially parallel to the direction of rotation of the disc when it engages the surface of the disc and the compact 18 engages the surface of the disc with its working edge arranged substantially diagonally towards the disc rotadonsriktiuing. The working edge of the press body 18 would intervene the surface of the disc in a position adjacent to the point at which the press body 16 working edge touches the surface of the disc.

The double-edged (sentence-cutting) tool 10 can be used jas in two ways depending. which substance 16, 18 as during the sharpening first goes over the disc 20. If the long blank 16 goes before the short one the blank 18 will first disintegrate, then cutting will occur resulting in a smooth, stable, frictional surface of the disc. The short effect of the substance 18 kornmer with respect to. dimensions to stabilize lize the disc 20 and open it slightly, especially if the blank is used with a positive rake angle.

If the tool 10 is used so that the short blank 18 precedes the long blank 16, the cut becomes the dominant sharpening method.

However, the tool wear is greater for the short substance, which puts more of the long substance against the wheel and causes a grind effect. The dimensional control is excellent but: the net stability decreases due to of adhesive bridges breaking during the grinding action.

Fig. 4 shows an alternative tool 10 'which is particularly useful. for surface grinding machines and other machines where the tool oscillates 10 ' performs a number of sharpening movements over the grinding wheel. The tool 10 'utilizes two disintegrating blanks 26 and 28 and a cutting blank °? 9Û716¶ “§ 30. The composite body cores 26, 28 and 30 are embedded in or fitted at the tip 24- odn comprises gum material 26A, 28A. respectful 30A and abrasives 263, 285 and 3GB respectively as described in joke above. The design of the tool 10 'guarantees that a disintegrate workpiece 26 or 28 always precedes the cutting workpiece 30 when the tool oscillates over the surface of the grinding wheel. ëmenee 26 een 30 inr fl eanqg len vridas 1ao ° från aen eem vieee in Fig. 4. The blank 26 should be aligned as shown. Subject 30 can of course have a positive, zero or negative chip viral cell as shown in fig. za-zc. Although the invention has been described in terms of typical tools It is clear that in its broadest aspect the invention comprises also a method of sharpening according to which an abrasive is passed in a control in successive movements over a grinding wheel in order to dermal and cut. Although this method can be conveniently used with envez-eaeing of one per Fig. 1, or ace arm, when eeeilleringer is used, Fig. 4, it is thus possible to use the method with only an ax.

This method down a single substance would involve the sleeve interfering with the grinding wheel when aligned mainly parallel to the rotary roller of the disc to grind during the first movement (mean amee 16 in fig 1).

The second movement would expose the wheel to a cutting action by rotating the abrasive 90 ° around the axis of the tool handle and by passing it across the surface of the disc. As discussed earlier the order of the first oda second movement may be scar-turned.

The abrasive may be a composite body or composite compacts of diamond, cubic bomitride or "wurtzitic" ~ boron nitride or a so-called macle diamond (a thin triangular natural diamond mantle in koznbirxatiorx with a long needle-shaped crystal), or compacts of hardine numbers.

Claims (8)

7907161-9 PATEIJHGAV A method of sharpening a rotary axis grinding wheel with a non-rotatable sharpening tool, in which the grinding wheel is noted around its axis, characterized in that the rotating grinding wheel is brought into contact with the conductive, grinding, machining edge of a first composite. press body placed on the tip of the sharpening tool, said conductive edge of the first composite press body being aligned substantially parallel to the direction of rotation of the disc and by moving said conductive machining edge across the disc to provide a grinding effect by contacting the grinding wheel with , grinding machining edge of a second composite press body, which is likewise placed on the tip of the sharpening tool and which has its conductive edge aligned substantially perpendicular to the direction of rotation of the disc, and by moving the leading edge of said second composite press body across the surface of the disc to provide - come a cutting effect. 2. A method according to claim 1, characterized in that said cutting effect is achieved before said grinding effect. A non-rotatable, non-rotatable multi-point sharpening tool for a rotating grinding wheel, comprising a shank part, a tip and at least two composite compacts placed on the wets, a composite compacing being characterized as a mass of abrasive particles bonded to each other, The wild mass consists of at least 70 volumes of an abrasive selected from the group comprising crystals of diamond and cubic boron nitride which are handle to each other and in the case of diamond a bond to crystal occurs to crystal, and which mass is bonded to a cemented carbide matrix selected from the group consisting of tungsten, titanium and titanium carbide, characterized in that the sharpening tool (10, 10 ') has a first (16, 26) of said composite compression pairs which has a conductive, abrasive edge, and a second (18, 30) of said composite compression body which has a conductive, abrasive edge, the first composite compression body (16, 26) is so placed on the tip (14, 24) that its conductive edge engages tangentially with the rotating surface of the grinding wheel (20) in order to grind the grinding wheel and wherein the second composite compression body (18, 30) is so placed on the tip (14, 24) that its leading edge is perpendicular to the rotating surface of the grinding wheel (20) in order to cut the grinding wheel. Sharpening tool according to claim 3, characterized in that the first and second composite compacts (16, 26 and 18, 30, respectively) have machining edges which lie in a substantially perpendicular relationship to each other. _ Sharpening tool according to claim 3 or 4, characterized in that the tip (24) has first (26), second (30) and / or third (28) composite compacts extending therefrom, the first (26) and / or: the third (28) composite compression body has a long-stretch, abrasive machining edge intended to. tangentially abutment with the periphery of the south grinding wheel (20); and mixtures thereof. Sharpening tool according to claim 3-5, characterized in that the second composite compact (18, 30) is set in a positive chip circle. Sharpening tool according to claims 3 - 5, characterized in that the second composite compression body (18, 30) is set in a negative chip vortex. in Sharpening tool according to claims 3 - 5, characterized in that the second composite compression body (18, 30) is set in a zero-chip display.