Compact unicum

At NKMZ, within the framework of the technical re-equipment program, a new up-to-date unique slotting machine POLYMAT 70/300 СNC manufactured by Leistritz (Germany) was put into operation.

This machine, probably, can be called one of the most compact among all metal-cutting machine tools operated at NKMZ today. Its dimensions: 1420x1250x1640 mm. At the same time, it has a lot of advantages, and was very necessary for the company.

First of all, this machine is designed for processing internal straight-sided splines at gears and pinions , which are used in gearboxes of roadheaders manufactured at NKMZ. For a long time, the broaching method was used for machining such splines, requiring an expensive tool. But the broaching machine, on which this technological operation was performed, lost its accuracy, and the splines had to be machined using spark-erosion equipment, which was much more expensive and took more time.

After purchasing the POLYMAT 70/300 CNC machine this problem was solved. It provides processing of straight-sided splines in efficient and quality manner and has high accuracy characteristics and covers all standard sizes of gear splines, pinions and sprockets manufactured at NKMZ. The main characteristics of this equipment are as follows: maximum groove length – 300 mm, groove width 2-70 mm, hole diameter – from 10 to 440 mm.

By means of new machine, it is possible to make a diametrical seat of the splines with an accuracy of 7 quality class, while by means of universal ones – only a straight line. It uses a tool with carbide blades, which makes it possible to process materials with a hardness of 340-360 HB, which is higher than with a broaching machine.

The main application of the POLYMAT 70/300 CNC is processing of splines. But, besides this, NKMZ specialists tested and implemented a method of processing conventional keyway slots with a width of 2 to 70 mm with this machine. Here, with the use of special installation tools, their processing is carried out 30% faster than with universal slotting equipment.

Press relations service of NKMZ