Grinding the outer circle to the point (3)

For the ZF application area, the Quickpoint 5000/40 model was selected to grind the outer cylinder, end face and shoulder in one setup. Hartmut Grossman then came to JUNKER several times with various shafts in 1996, in order to carry out a series of tests on the test machine: "This is a period of learning and giving to both parties. And the time of the request. At the beginning we expected the difficulty of grinding and burning, but we solved this problem very quickly. And in the processing time, we gradually approached ZF’s idea and processed the time from The reduction of 5.7 minutes to 3 minutes is equivalent to saving 47% of the time. We worked together to design a process based on mass production and realized the acceptance of the machine tool.
In the process, people took into account the characteristics of the Quickpoint process. Because it is the opposite of the combined package grinding - it is not a positional grinding, but a feed grinding, so the data concept of "straightness" is given on the drawing, where the outer surface of the housing of the housing must be A process safety value of 1.5 μm is reached.

From the beginning of one, to the purchase of five

According to negotiations conducted in mid-1997, the first machine tool should be delivered after one year. Because during this period, small shafts of typical shaft parts used for different stages of development need to be ground, JUNKER temporarily provided its own test machine to ZF. For this service, Mr. Grossman still highly praises: "In advance, I called the company and took these axes. In the meantime, they have sent people to adjust the machine so that I can Fast delivery of these axes to our users. This made me feel the partnership. Although we were still considering the second supplier, they could not fully realize their commitment in the process, so we More determined the determination to choose JUNKER."

The machining process can only be operated with the care of the machine tool builder. First, the grinding work of the CBN grinding wheel reached 60,000 shafts. It is also satisfactory that the intermediate tooling cycle is once every 50 workpieces and the grinding speed reaches 100 m/s. However, as the number of workpieces increased, the production capacity of the machine tool quickly became limited, so ZF purchased a second machine. For this reason, there is also the potential to be tapped in terms of saving wages, because the gantry-type loading and unloading device and pallet transport used between the two machines can be taken care of by the same worker (see picture 4). The process safety has been further improved by means of an on-line measuring instrument integrated on the machine tool, so that the current machine tooling capacity value cmk has reached 1.67.

Figure 4

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