Process for the production of a cup wheel

Abstract

A cup grinding wheel includes a cup-shaped carrier, and an annular grinding body. The annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, and the annular grinding body is connected only by a binding region having an annular surface to an annular mounting surface of the cup-shaped carrier.

Claims

1. A cup grinding wheel including: a cup-shaped carrier, and a single-piece annular grinding body, wherein the single-piece annular grinding body is connected only by a binding region having an annular surface to an annular mounting surface of the cup-shaped carrier such that the single-piece annular grinding body is completely outside the cup-shaped carrier, and wherein an inside grinding surface at an inside of the single-piece annular grinding body is not covered by the cup-shaped carrier and thus the inside of the single-piece annular grinding body can also be used as an inside grinding surface.

2. The cup grinding wheel as set forth in claim 1, wherein an end edge region of the cup-shaped carrier has the annular mounting surface.

3. The cup grinding wheel as set forth in claim 1, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

4. The cup grinding wheel as set forth in claim 2, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

5. A cup grinding wheel including: a cup-shaped carrier, and a single-piece annular grinding body, wherein the single-piece annular grinding body is connected only by a binding region having an annular surface to an annular mounting surface of the cup-shaped carrier such that the single-piece annular grinding body is completely outside the cup-shaped carrier, and wherein no supporting ring is necessary for fixing the single-piece annular grinding body to the cup-shaped carrier and thus an inside of the single-piece annular grinding body can also be used as an inside grinding surface.

6. The cup grinding wheel as set forth in claim 5, wherein the single-piece annular grinding body is completely in the shape of a cone ring.

7. The cup grinding wheel as set forth in claim 5, wherein an end edge region of the cup-shaped carrier has the annular mounting surface.

8. The cup grinding wheel as set forth in claim 5, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

9. The cup grinding wheel as set forth in claim 6, wherein an end edge region of the cup-shaped carrier has the annular mounting surface.

10. The cup grinding wheel as set forth in claim 7, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

11. The cup grinding wheel as set forth in claim 7, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

12. A cup grinding wheel including: a cup-shaped carrier, and a single-piece annular grinding body, wherein the single-piece annular grinding body is connected only by a binding region having an annular surface to an annular mounting surface of the cup-shaped carrier such that the single-piece annular grinding body is completely outside the cup-shaped carrier, wherein the single-piece annular grinding body is completely in the shape of a cone ring, and wherein an inside grinding surface at an inside of the single-piece annular grinding body is not covered by the cup-shaped carrier and thus the inside of the single-piece annular grinding body can also be used as an inside grinding surface.

13. The cup grinding wheel as set forth in claim 12, wherein an end edge region of the cup-shaped carrier has the annular mounting surface.

14. The cup grinding wheel as set forth in claim 12, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

15. The cup grinding wheel as set forth in claim 13, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation, wherein, after the single-piece annular grinding body is connected to the cup-shaped carrier, no separation layer is visible between the single-piece annular grinding body and the cup-shaped carrier, and wherein, in the single hot-pressing operation, fusing or interpenetration is effected between materials of the single-piece annular grinding body and the cup-shaped carrier.

16. The cup grinding wheel as set forth in claim 1, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation.

17. The cup grinding wheel as set forth in claim 5, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation.

18. The cup grinding wheel as set forth in claim 12, wherein the single-piece annular grinding body is connected to the cup-shaped carrier by a single hot-pressing operation.

19. The cup grinding wheel as set forth in claim 1, wherein the single-piece annular grinding body is connected to the cup-shaped carrier in only one plane.

20. The cup grinding wheel as set forth in claim 5, wherein the single-piece annular grinding body is connected to the cup-shaped carrier in only one plane.

21. The cup grinding wheel as set forth in claim 12, wherein the single-piece annular grinding body is connected to the cup-shaped carrier in only one plane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details and advantages of the present invention will be described in greater detail hereinafter by means of the specific description with reference to the embodiments by way of example illustrated in the drawings in which:

(2) FIG. 1a shows a diagrammatic view of an annular grinding body,

(3) FIG. 1b shows a diagrammatic view of a cup-shaped carrier,

(4) FIG. 2a shows a diagrammatic view of the grinding body fixed to the carrier,

(5) FIG. 2b shows a diagrammatic view of detail X,

(6) FIG. 3 shows a diagrammatic view of the molds used in the pre-shaping process,

(7) FIG. 4 shows a diagrammatic view of the molds used in the hot-pressing process,

(8) FIG. 5a shows a diagrammatic sectional view of a cup grinding wheel with supporting ring, and

(9) FIG. 5b shows a diagrammatic sectional view of a cup grinding wheel without supporting ring.

DETAILED DESCRIPTION OF THE INVENTION

(10) FIG. 1a shows a grinding body 3. The grinding body 3 which is made from super abrasive grain and a binding agent preferably has four surfaces. Disposed at the end faces of the annular grinding body 3 are, respectively, a binding region 5 and a face grinding surface 4b. At the outside the grinding body 3 forms an outside grinding surface 4a. The inside 7 of the grinding body 3 forms the inside grinding surface 4c.

(11) FIG. 1b shows a cup-shaped carrier 2. Depending on the material from which the grinding body 3 (not shown in FIG. 1b) is made, the carrier 2 is produced substantially completely from metal or plastic material. The common variant represents a combination of plastic and metal, as can also be seen in the detail view X in FIG. 2b. The cup-shaped carrier 2 at one of its end faces forms the mounting surface 6. In addition, the carrier 2 has an opening disposed in the bottom of the carrier 2. That is not visible in the view in FIG. 1b as it is concealed by the peripheral portion of the carrier 2. The cup grinding wheel 1 is clamped to a grinding apparatus by way of that mounting opening 17 (not visible in FIG. 2a but shown in FIGS. 5a and 5b).

(12) FIG. 2a shows a grinding body 3 fixed to the carrier 2. For that purpose, the grinding body 3 is fused with its binding region 5 to the annular mounting surface 6 of the carrier 2. Even after fusion of the grinding body 3 to the carrier 2, the grinding surfaces 4a, 4b and 4c are still retained. Only the binding region 5 is lost by virtue of being fixed to the carrier 2 and thus cannot be used as a grinding surface. The detail X in FIG. 2a is described more fully in FIG. 2b.

(13) FIG. 2b diagrammatically shows a detail view X from FIG. 2a. The detail view X shows that the material of the grinding body 3 has mingled with the material of the carrier 2. There is thus no separation plane between the grinding body 3 and the carrier 2. The forces received at the grinding body 3 are diverted into the carrier 2 by virtue of that homogeneous transition. The super abrasive agents 22 shown in FIG. 2b are held together by a binding agent 23. The binding agent 23 can both be of metallic origin or can comprise synthetic resin. A mixture of both would also be conceivable. In other words: a grinding body 3 with synthetic resin binding as the binding agent 23 is used on a carrier 2 with a synthetic resin mixture or metal-synthetic resin mixture. A metal powder is used for the carrier 2, for a grinding body 3 with a metal binding as the binding agent 23.

(14) FIG. 3 diagrammatically shows a manufacturing process, referred to as the pre-shaping step, in which the grinding body is pre-shaped in a mold comprising a pressing ring 13, a facing bottom punch 12 and a facing top punch 11. For that purpose, the mixture of binding agent 23 and super abrasive agent 22 is introduced into the region between the top punch 11, the bottom punch 12 and pressing ring 13. The material disposed there is hardened under pressure. In that case, no additional temperature is added. That cold pre-shaping operation affords the grinding body 3 which remains in its shape even when the bottom punch 12 is removed.

(15) FIG. 4 shows how the facing bottom punch 12 has been replaced by the carrier bottom punch 14. The grinding body 3 which has already been pre-shaped remains in its position even when the punches 14, 15 and 16 are changed. The carrier top punch 15 is introduced into the opening region of the top punch 11 after the material for the carrier 2 has been introduced. The opening 17 which is not visible in FIG. 4 and which is then provided for receiving the cup grinding wheel 1 on a grinding apparatus is shaped by the pin 16. The carrier 2 is shaped and at the same time fused to the grinding body 3 by pressure and heat in the hot-shaping step by virtue of the cooperation of the top punch 11, the carrier top punch 15, the carrier bottom punch 14, the pin 16 and the pressing ring 13. That saves working time, and the grinding body does not have to be removed from the mold between the stepsconsequently, there is no risk of a breakage when shaping the grinding ring. The joint pressing operation in the hot-shaping step affords an optimum binding effect between the grinding body 3 and the carrier 2 so that a supporting ring 20 (not shown in FIG. 4) can be omitted. Fusion of the material between the grinding body 3 and the carrier 2 is visible under a microscope and can therefore also be demonstrated. In the production process by means of an adhesive join and in a standard production operation with two separation hot-shaping steps, a clear interface is to be noted under a microscope between the grinding body 3 and the carrier 2.

(16) FIG. 5a shows a cup grinding wheel 1 with a supporting ring 20. In this embodiment, the supporting ring 20 is afforded by the carrier 2. The carrier 2 supports the grinding body 3. When the grinding body wears at its face, grinding surface 4b then the supporting ring 20 would have to be moved rearwardly by a turning-off operation using a turning lathe or another piece of equipment. For that purpose, the cup grinding wheel 1 is gripped at its mounting opening 17, for example in a turning lathe, and turned down rearwardly with a turning lathe tool. The operation of unclamping it from the grinding apparatus, clamping it in a suitable clamping means in a turning lathe by way of the mounting opening 17, turning off the supporting ring, unclamping it from the turning lathe and fitting it into the grinding apparatus requires many unnecessary working steps.

(17) Instead of the supporting rings 20 which are shaped by the carrier, the rings could also be subsequently cast in place behind the grinding body 3 in bonded relationship with the carrier 2. That also requires many additional working steps in production of the cup grinding wheel.

(18) FIG. 5b shows the cup grinding wheel 1 according to the invention. It will be seen that no disruptive supporting ring 20 is fitted to the grinding body 3 or the carrier 2. Thus, there are three grinding surfacesthe outside grinding surface 4a, the face grinding surface 4b and the inside grinding surface 4c. Those three grinding surfaces can be used for machining a workpiece. If the cup grinding wheel 1 has to be cut back at its end grinding face 4b there is no supporting ring 20 that has to be subsequently subjected to machining.