| 摘要 |
PURPOSE: A method for processing surface of a bore is provided to improve a processing speed and to obtain a surface of excellent appearance by eliminating post-process. CONSTITUTION: Cylinder bores(2) for lifting of linerless pistons are formed in a cylinder block(1). Surface of the cylinder bore is processed by electron beams generated from an electron beam generator via a guide. A protecting direction of the electron beam is controlled by an electromagnet. The electron beam generator satisfies such conditions as 1 to 10MeV of electronic energy, 1 to 30cm of beam size, 1 to 10cm/sec of beam speed, 1 to 30cm of distance from an electron nozzle to the surface, and 1 to 10mA of electron current. According to surface processing via the electron beam generator, a processing speed of a cylinder bore of a linerless engine is improved by sufficient heat input through the electron beams. Further, oxidization of the surface is avoided according to the short processing time period and a neat surface is obtained without post-process.
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