DE2412184A1 - Stone holder for micro finishing tool - has hard metal insert for super finishing stone projecting beyond insert - Google Patents

Abstract

Micro finishing tool stone-holder for machining workpiece surfaces with a hard metal insert for accepting a micro finish-stone which projects only slightly beyond the hard metal insert and is supported at its projecting section on the workpiece surface. The distance (d) between a final edge of the micro finish stone projecting beyond the hard metal insert and a final edge of the hard metal insert is of the order of 0.1 mm. and these edges have the same radii of curvature or alternatively have different radii of curvature.

Description

Stone holder for superfinishing device The invention relates to a Stone holder for superfinishing device for machining workpiece surfaces with a Carbide insert for holding a superfinish stone.

In known stone holders with hard metal sets, for example the superfinishing stone is inserted into a groove in the carbide set and stands considerably about this before. As in the processing of hard materials in the Reyel relatively which superfinishing stones have to be used to get optimal results in the shortest possible time To get results, use these soft stones very quickly in operation so that you get play in the stone holder set. Because of the length of the unsupported or unguided stone, there is a risk of breaking off. As another nightmare In addition, there is no longer any correct guidance of the stone. Try, the side wear the stones by clamping or by support to prevent in order to avoid the disadvantages, although there is an improvement, but are not sufficient to ensure a correspondingly long service life of the stones guarantee.

In contrast, it is the object of the invention to provide a stone holder To improve the type mentioned at the outset so that a considerable delay in the Service life of the column with the possibility of a more precise setting of the column holder is obtained. According to the invention, this object is achieved in that the superfinishing stone protrudes only slightly over the hard metal insert and protrudes with selnem Part is supported on the workpiece surface.

The distance between the two protruding beyond the carbide set End edge of the superfinishing stone and one end edge of the hard metal insert is advantageously on the order of 0.1 tin.

This means that the stone supports up to approx. 0.1 mm from the track and therefore the risk of breaking off is very low. Preferably have the end edges of the hard metal insert and the superfinishing stone the same Radle of curvature. In another embodiment, the radii of curvature are the end edges of the hard metal insert and the superfinishing stone under educated. The curvatures of the end edges can expediently be equal to or run irregularly. In a further development, the rejuvenating one takes Carbide insert In a longitudinal groove In the well-known catfish on the superfinishing steep. Furthermore, the hard metal insert has two longitudinal edges that converge in a wedge shape Pass over edges that connect tangentially to the end edge of the hard metal insert.

With the invention the essential advantage is achieved that optimal Results regarding the service life of superfinishing stones and the precision the setting of the stone holder using relatively soft ones Stones can be achieved when machining hard material surfaces. This will be Reduced the cost of superfinishing because of the time-consuming work required for clamping and setting too fast worn superfinishing stones less often are.

The invention is illustrated in the following with the aid of a drawing Embodiment explained in more detail.

The drawing shows a schematic cross-section of a stone holder, such as it can be used, for example, for machining ball bearing raceways can. Of course, it doesn't matter whether the column holder is used for processing used by outer or inner rings, spherical or cylindrical workpieces will.

A tapered cemented carbide insert 10 takes in an elongated Nut a superfinishing stone 12. The hard metal set 10 is in the longitudinal direction on both sides over the superfinishing stones 12, taper the longitudinal edges slch through the transition to two trowel-shaped converging edges 20, which are approximately connected across the width of the superfinishing stone 12 by a curved terminal edge 14 are.

The curvature of the edge 14 can be either uniform or non-uniform be.

The curved end edge 16 of the superfinishing stone 12 lies on a spherical surface of a workpiece 18. The distance d between the final edge 16 of the superfinishing stone 12 and the end edge 14 of the hard metal insert 10 is of the order of 0.1 mm, in other words that the Superfinishing stone 12 to approx. 0.1 mm is supported by the track. The curvature the two edges 14, 16 are preferably the same, but can also differ from one another aDwhich. The edges 20 of the hard metal set 10 set, for example, the terminating edge 14 continues in the tangent direction.

Thanks to the extensive support of the superfinishing stone 12 The cemented carbide insert 10 will greatly improve the standing of the stone as well as the possibility of a more precise setting of the stone holder achieved.

Expectations

Claims (7)

A n p r u c e 1. Stone holder for a superfinishing device for processing of workpiece surfaces with a hard metal insert for holding a superfinishing stone, d a d u r c h e k e n n z e 1 c h -n e t that the superfinishing stone (12) over the hard metal set (1o) protrudes only slightly and its protruding Tell is supported on the workpiece surface. 2. stone holder according to claim 1, d a d u r c h g e k e n n -z e I c h n e t that the distance (d) between two protruding beyond the hard metal insert (10) End edge (16) of the superfinishing stone (12) and an end edge (14) of the Hard metal insert (10) is in the order of 0.1 mm. 3. Stone holder according to claims 1 and 2, d a d u r c h g e -k e n n z e 1 c h n e t that the end edges (14; 16) of the hard metal insert (10) and the superfinishing stone (12) have the same radius of curvature. 4. Stelnhalter according to claims 1 and 2, since d u r c h g e -k E n n z e I c h n e t that the radii of curvature of the end edges (14; 16) of the The hard metal insert (10) and the superfinishing steles (12) are designed differently are. 5. Stelnhalter according to claim 3 or 4, d a d u r c h g e -k e n n z e I c h n e t that the curvatures of the end edges (14; 16) are equal or run unevenly. 6. Stelnhalter according to claims 1 to 5, d a d u r c h g e -k It is noted that the tapered carbide set (10) in one Longitudinal groove receives the superfinishing steles (12) in a known manner. 7. stone holder according to claim 6, d a d u r c h g e k e n n -z e i ch n e t that the hard metal set (10) curl up two longitudinal edges, the In wedge-shaped converging edges (20) merge tangentially to the terminating edge (14) of the hard metal insert (10).