Especially in mass production, CBN grinding wheels have obvious cost advantages.
JUNKER strives to achieve more efficient centerless grinding with the Jupiter model: According to JUNKER, grinding at the same time across the width of the grinding wheel allows for very high throughput. At the same time, the service life of the grinding wheel can be extended. It is worth emphasizing that the CBN grinding wheel is used for processing. This kind of grinding wheel is especially advantageous when processing large quantities of workpieces.
In the JUNKER Jupiter model, the workpiece is rotated between an adjustment wheel and a grinding wheel, the workpiece is not clamped, and a support rail is used to support the workpiece. The manufacturer recommends this model as a solution for the following workpiece states: those that have to be put into practice due to their own shape or small size. Whether for high-volume or low-volume production, the Junker models are designed to dramatically reduce total machining time.
This Jupiter machine solution allows simultaneous grinding and repair of large quantities of workpieces.
The two-step process of through-grinding and plunge-cut grinding makes the top-notch grinding process economical and can be used to machine a variety of completely different workpieces.
During the through-grinding process, the workpieces are circulated on the machine in a seamless sequence, with all workpieces having the same diameter to be ground. These workpieces pass through between the grinding wheels and reach the end of the grinding unit. Combined with a fully automated loading and unloading system, these workpieces can pass through the machine without interruption. The second tipless grinding method of the Jupiter model is plunge grinding: in the case of plunge grinding, the grinding wheel, the guide wheel and the support wheel all have an "opposite contour" to the workpiece. This makes it possible to simultaneously grind all the diameters to be ground on the workpiece. Furthermore, an axial baffle placed on a support rail that also has a "fitted profile" ensures correct workpiece position. When using the Jupiter model for plunge grinding, the loading and unloading process is performed from the upper end through an integrated conveyor gantry.
According to JUNKER, the coreless grinding process of JUNKER is particularly suitable for high-volume processing of difficult-to-cut materials. Because the model and the CBN grinding wheel complement each other: the long service life of the grinding wheel makes the interval between the repairing tools significantly longer. In this way, the auxiliary time of standby is reduced, and the utilization rate of the machine tool is greatly improved. At the same time, its high degree of grinding also significantly shortens the entire grinding time.
The coreless grinding of JUNKER is cooled by oil or emulsion medium. With only a low pressure, the shoe nozzle can achieve the required minimum cooling capacity over the entire length of the workpiece in the grinding gap, thus ensuring a good cooling effect with a low amount of coolant.
Typical workpieces that are best suited for through-grinding are pistons, rings, piston components or shafts, and piston rods. The plunge grinding method is more suitable for the bearing surface of the drive shaft and camshaft, and the pipe fitting and valve stem inserted into the camshaft are used for grinding. When using the plunge grinding method, the length of the workpiece must not exceed 500 mm. Through-through grinding requires constant workpiece delivery. To this end, the Jupiter model can be supplied in a variety of workpiece delivery options: from manual feeding to fully automated loading and unloading systems including electronic workpiece measurement, sorting stations and buffer unloading stations.
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