Technology

Technology

Process: The Magnetfinish(MF) technology is a new mechanical processing form for the workpiece surfaces. The workpiece is positioned in a magnetic field created by a magnetic tool. The gap is filled with processing powder. Each grain of this powder contents abrasive and magnetic components. The magnetic components have the function to hold the powder in this space meanwhile the abrasive components fulfill the cutting function by the relative movement of powder to the workpieces. The powder holds on the surface of the magnetic tool and accomplishes its movements. By using permanent magnetic tools the adhesion of the powder is very strong, so it gives a high pressure on the surface wich is in process. A very high productivity of cutting process is so the result from this technology.

Applications: With this technology it is not only possible to process magnetic materials (e.g. HSS) but also light magnetic (e.g. HM) and non-magnetic materials (e.g. Cermet). Especially for processing of cutting tools are two magnetic tools applicated. The Magnetfinish technology can be used for materials with different hardness. The powder works during the process as an elastic tool. The hardness of this tool may be varied through the variation of definite technological parameters of the process. So, for example the enlargement of the processing interspace between the magnetic tool and the cutting tool surface generates a more smooth and elastic tool. Surfaces will be smoothed till a roughness of Ra = 0,02 mm and Rz = 0,08 mm. Outside edges and chipping edges gets an exactly defined and reproducable radius between 3 mm and 50 mm.

Prinzipielle Arbeitsweise des Magnetfinish-Verfahrens

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left:

M12-Tap, second tooth, 80 x magnification, cutting edge jagged and with burrs

rigth:

M12-Tap, 15s MF-processed, elimination of nicks and burrs, smoothing the surface

Due to the drecreasing of the surface roughness and the reproducible edgerounding, the Magnetfinish technology is predestined for processing of different cutting tools. The regular and exact rounding of cutting edges is very important not only for tools wich will be finished without getting a coating layer but also for best preparation to a coating process. Typical examples are: Taps, mills and endmills, drills, stamp tools etc.

coated tap before polishing

A further application of the Magnetfinish technology is polishing of coated surfaces. Just in a few seconds droplets will be removed and the coating layer will be polished. The coefficient of friction of the tool decreased considerable. This effect was already demonstrated on different tools and a wide area of coating layers.

The Magnetfinish technology can also be applied on various and complex surfarce structures in only one step. Our engineers are continuously testing together with our customers new application areas.

Coated tap after polishing with Magnetfinish