Technological method of fine boring large-sized diesel engine cylinder porous series

Abstract

The invention discloses a process method of a finish machining large-scale diesel engine cylinder body porous system. The process method comprises: machining two or more than two holes inside a porous system on a cylinder body by adopting self guidance of a workpiece; installing a guide sleeve on the two machined holes inside the porous system on the cylinder body as guidance; installing a float boring bar inside the guide sleeve; installing a precision boring unit and a boring cutter on the float boring bar corresponding to a to-be-machined hole; and connecting the float boring bar with a main shaft to carry out precision machining on a large-scale diesel engine cylinder body porous system hole on a horizontal boring and milling machine or a horizontal machining center. The process method makes use of a machined hole of the workpiece for guidance so as to carry out machining on the porous system with large aperture, long distance and higher requirements on size, form and position precision and surface roughness concentration; moreover, the method has high machining precision and lower process cost and can meet the requirements of high-precision process. The process method does not require special machine tool and special frock and has simple and safe operation and quick production; therefore, the method is suitable for popularization and application in the engine industry.

Description

technical field [0001] The invention relates to a process method for finishing the porous system of a cylinder block of a large diesel engine, which is especially suitable for the production cycle, large hole diameter, long hole distance, hole system diameter, cylindricity, coaxiality and other dimensions, and high requirements for shape and position accuracy. Precise machining of main shaft hole and camshaft hole of large engine prototype. Background technique [0002] Large diesel engines have many important porous systems, such as main shaft holes, camshaft holes, etc. The machining accuracy of these porous systems has an important impact on the performance of diesel engines, and the processing of these porous systems is relatively difficult. The main shaft hole of the cylinder block of a large diesel engine is taken as an example to illustrate below. [0003] The main shaft hole in the cylinder block of a large diesel engine is used to install the crankshaft. It is one ...

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Problems solved by technology

Due to the large diameter of each spindle hole (generally greater than Φ50 mm), long spacing (generally greater than 1 meter), high requirements for size, shape and position accuracy (generally not less than 7 grades of precision), and high surface roughness requirements, it belongs to inner hole processing. , the p

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