When machining deep-hole workpieces with precision parts, in order to prevent vibration, the shank is limited by the diameter of the inner hole. It is generally thin and long, with poor rigidity. It is prone to vibration and tool yielding during turning, causing defects such as ripples and tapers in the workpiece. When drilling holes, avoid vibration.
(1) The internal support method enhances the rigidity of the tool bar
Increase the width and thickness of the tool bar, or use auxiliary support methods. Tapping an M10 thread under the arbor, and screwing in a round head screw of appropriate length. When turning the hole, first test a stepped hole with a length of about 30mm, then stop and adjust the bolt, make the bolt head contact with the hole wall and lock it, and then turn it.
(2) Larger hole support
For holes with larger diameter and length dimensions. Screw holes that are perpendicular to each other can be machined on precision parts around the turning tool, and studs can be screwed into the screw holes, and they are perpendicular to the tool shaft. The bolt head and the tool tip are on the same rotating diameter surface. After adjusting the extension distance of the bolt, tighten the nut. When turning holes, the head of the bolt contacts the machined surface, and the gas is used to support the tool bar.
(3) Internal cooling tool bar
Turning deep holes is a difficult job. In order to solve the problem of poor cooling conditions during processing, internal cooling tool holders are used. When cutting, the cutting fluid enters the toolholder from the tail, then enters the workpiece, and then discharges
(4) Deep hole combination arbor
Install the tool holder on the tool holder of the lathe, and grind the inner hole knife into a reversed cutting edge. When installing, the length of the turning tool head moves in the hole into two tool heads with different lengths. The shorter turning tool is turned first, and the longer turning tool is turned for the second time to turn the hole to size. Only by adjusting the protruding length of the two turning tool heads, the precision parts of the tool bar can be processed into deep holes of different diameters.