Patent Application
20100204029
This application claims priority of European Patent Office Application No. 09001824.3 EP filed Feb. 10, 2009, which is incorporated by reference herein in its entirety.
The present invention relates to a dressing roll mounting device for mounting a dressing roll on a dresser shaft of a grinding wheel dressing unit.
Grinding wheel dressing units serve for the profiling of grinding wheels and are often integrated directly in grinding machines. They have a specific drive unit for driving a dresser shaft on which the dressing roll is mounted. By the rotating dressing roll being dipped into the rotating grinding wheel, a dressing of the grinding wheel profile takes place. Dressing may take place intermittently or continuously during the machining of a work piece by the grinding wheel, continuous dressing being advantageous in that a clogging of the grinding wheel with metal particles is prevented and therefore a constantly sharp grinding wheel is guaranteed. The reduction in the grinding wheel diameter which occurs due to the grinding wheel wear during machining and as a result of the dressing process is compensated with the aid of a corresponding infeed of the dressing roll.
In the process of deep grinding turbine blades, especially narrow tolerances have to be manufactured. For profiling the grinding wheels used, as a rule, electrolytically bound diamond dressing rolls are employed. These are joined to dresser shafts by means of a transition fit and are thus mounted or driven in the grinding machine. In this case, very high tolerance requirements are demanded for achieving a proper concentricity and axial run-out. The mounting of the dressing rolls on the dresser shafts normally takes place either directly in the machining space of the grinding machine or in workshop surroundings, in the latter case the demounting of the dresser shaft, together with the dressing roll, and transport into the workshop being required. During the mounting and demounting of the dressing roll on and from the dresser shaft, it is necessary at the present time to have additional dressing roll mounting devices, such as, for example, hot cabinets, cold cabinets, press-in presses or the like. Nevertheless, a tilting of the dressing roll and dresser shaft during mounting or demounting often cannot be prevented, and therefore the shafts and/or bores, manufactured with high precision, of the components to be joined together are damaged.
An object of the present invention is to provide a dressing roll mounting device of the type initially mentioned, in which damage to the shaft and/or bore, manufactured with high precision, of the components to be joined together is prevented. Moreover, an easy dressing roll mounting and, if appropriate, also demounting of dressing rolls in the machining space of grinding machines are to be made possible. A further object is to provide a dressing roll mounting device in which complicated mounting aids, in particular hot cabinets and cold cabinets, can be dispensed with.
This object is achieved, according to the present invention, in that the dressing roll mounting device has a mounting sleeve which can be positioned at a free end of the dresser shaft and the outer face of which is provided with a conical mounting region which serves as a centering and pushing-on aid during the mounting of the dressing roll on the dresser shaft, a maximum outside diameter of the conical mounting region being smaller than a dressing roll reception diameter of the dresser shaft or corresponding to this.
Accordingly, the dressing roll bore is not pushed directly onto the end of the dresser shaft, but, instead, first onto the conical mounting region of the dressing roll mounting device, the diameter of which mounting region is smaller than or equal to the dressing roll reception diameter of the dresser shaft. Thus, a tilting of the dressing roll of the dresser shaft, when the dressing roll is being placed onto the dresser shaft, and correspondingly damage to the bore or shaft manufactured with high precision can be reliably prevented. Correspondingly, a mounting or demounting of the dresser shaft can also take place relatively easily in the machining space of a grinding machine. Furthermore, the automatic centering of the dressing roll bore with respect to the dresser shaft, when it is being pushed onto the conical mounting region of the dressing roll mounting device according to the invention, and the accompanying optimized orientation of the components to be joined together can make the use of hot and/or cold cabinets unnecessary. Mounting/demounting times and/or costs can be reduced correspondingly.
The outer face of the mounting sleeve may be provided with a conical demounting region which serves as a stripping aid during the demounting of the dressing roll from the dresser shaft. Demounting is thereby also made appreciably easier.
The mounting region and the demounting region are advantageously arranged in such a way that they merge one into the other. The demounting region preferably faces the dresser shaft in the intended state of the dressing roll mounting device, while the mounting region faces away from the dresser shaft.
The mounting region and, if present, the demounting region preferably extend over the entire length of the mounting sleeve, so that the latter is utilized optimally.
The mounting sleeve is preferably designed in such a way that it can be fastened to a spindle journal of the dresser shaft. In this case, the dressing roll mounting device can be mounted on the dresser shaft particularly simply.
The mounting sleeve is preferably produced from a material of high hardness, such as, for example, from an advantageously hardened chrome/nickel alloy.
With regard to further preferred embodiments of the present invention, reference is made to the dependent claims and to the following description of exemplary embodiments by means of the accompanying drawing in which:
As soon as the dressing roll 12 is positioned properly on the dresser shaft 14, the mounting sleeve 16 can be drawn off from the spindle journal 20, so that the spindle journal 20 can be received in its mounting again (not shown). The dressing roll 12 is also secured beforehand by means of corresponding fastening elements (not shown), one of which is screwed onto the external thread 27 of the dresser shaft 14.
To demount the dressing roll 12, the mounting sleeve 16 is positioned on the spindle journal 20 of the dresser shaft 14 again, so that the dressing roll 12 can be drawn off, guided by the mounting sleeve 16, from the dresser shaft 14. In this case, too, damage to the dressing roll bore 25 of the dresser shaft 14 is prevented due to the guidance afforded by the mounting sleeve 16.
| Number | Date | Country | Kind |
|---|---|---|---|
| EP09001824 | Feb 2009 | EP | regional |
