Line of rotators for electron beam welding

Operation in a vacuum environment imposes a number of requirements for construction of the rotator and its servo-drive, in particular:

• application of brushless electric motors in the servo-drives, where they should be significantly more powerful due to missing convective cooling,
• hermetic sealing of reducers,
• absence traditional lubricating oils.

The Paton Electric Welding Institute developed the line of these rotators for a wide range of overall dimensions and weights of welded workpieces:

• with faceplate diameter 200…300mm, freight-carrying capacity up to 10 kg, speed of rotation 0.42…8.4 rpm (Fig.1);
• with faceplate diameter 650…800mm, freight-carrying capacity up to 500 kg, speed of rotation 0.04…4 rpm;
• with faceplate diameter 1200…1350mm, freight-carrying capacity up to 1200 kg, speed of rotation 0.04…4 rpm;
• radial run-out of the faceplate ±0,05 mm;
• face run-out of the faceplate ±0,05 mm;
• positioning accuracy of the faceplate ±0,05 mm;
• execution of the rotators: with vertical, horizontal and inclined axes of rotation (Fig.2,4);
• servo-drives are controlled by CNC system

	b) Fig.1a,b.Small rotator with faceplate Ø200 mm inside of the chamber 600×600×600 mm
a)	b) Fig.2. Rotators with horizontal (a) and vertical (b) axes of the rotation, faceplate diameter 1200 mm
	Fig.3. Tailstock Fig.4. Rotator with inclined axes of rotation, faceplate diameter 800 mm.