A method for repairing the inner taper hole of the main shaft of the machining center

Abstract

The invention discloses a machining center main shaft inner cone hole repairing method. The method includes the steps of determining a repairing plan, fabricating a simulation shaft, positioning the simulation shaft, polishing a simulation shaft inner cone hole, positioning a central spindle to be repaired and polished, polishing an inner cone hole of the central spindle to be repaired and polished and the like. Compared with the prior art, the machining center main shaft inner cone hole repairing method has the advantages that auxiliary tools, such as a hemp rope, a flat centre, a steel ball and a double-center frame are adopted to innovate an original repairing method, the problems of the drive manner and positioning precision of a main shaft in the polishing process are solved, main shaft repairing quality is improved, the main shaft repairing requirement is met, and all precision indexes are raised by about 70%; meanwhile, repairing and polishing quantity is controlled each time, the main shaft can be repaired and polished multiple times, and the maintenance cost is greatly lowered.

Description

technical field [0001] The invention relates to a method for repairing the inner taper hole of the main shaft of a machining center. Background technique [0002] The spindle of the machining center is one of the important parts of the machine tool, such as figure 1 As shown, it is composed of housing 1, spacer 2, bearing 3, mandrel 4 and so on. Generally, the bearings will wear out after 3-5 years of use, so the daily main shaft maintenance is mainly to replace the bearings. However, after long-term use of the machining center machine tool, frequent tool changes are the main reason. In addition, the surface of the taper hole may be damaged due to the entry of foreign matter such as iron filings, or the taper hole may be deformed due to the collision of the spindle, resulting in the tool holder cone. The surface and the taper hole of the mandrel cannot maintain a reliable fit, which is manifested by the out-of-tolerance runout after the tool holder is installed on the main...

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Problems solved by technology

[0006] Above-mentioned two kinds of methods all are to adopt the method for rigid drive and direct alignment to process, and the shortcoming of existence has: 1, owing to be rigid drive, the vibration and rotation error that machine tool headstock produces in grinding process can be transmitted on the main shaft; 2. Its positioning accuracy cannot meet the coaxiality requirements of the front and rear bearing gears of the spindle and the taper hole of the tool holder, and cannot reach the micron-level repair accuracy

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