Process for processing sand outlets of engine cylinder

Abstract

The invention relates to a process for processing sand outlets of an engine cylinder, aiming to solve the problems that the prior process for processing the sand outlets of the engine cylinder is complex, the production cycle is long and the coaxiality of the rough processing hole and the fine processing hole is not consistent so that the fine boring hole has a black skin and poor roughness. The process comprises the following steps: (1) enlarging the front sand outlet and the rear sand outlet in a semi-finishing way by controlling the cutting speed of a lathe at 200-300m/min, the feeding amount at 0.3-0.4mm/r, the Ra at 6.3 and the cutting depth at 2.4-2.6mm; and (2) hinging the front sand outlet and the rear sand outlet by controlling the cutting speed of the lathe at 200-300m/min, the feeding amount at 0.3-0.4mm/r, the Ra at 2.5 and the cutting depth at 0.30-0.32mm until the sand outlets are processed to have the required apertures. The process for processing the sand outlets of the engine cylinder is simple and easy to operate, has short processing cycle and can ensure all the processing procedures can be finished on the same processing lathe, the production cost is low, the hole has no black skin and the roughness of the hole meets the requirements.

Description

technical field [0001] The utility model relates to mechanical processing, in particular to a processing technology for sand outlet holes of engine cylinder blocks. Background technique [0002] The processing of the sand hole of the engine block has always been a difficult technical problem for the workshop. The existing processing technology includes rough expansion - expansion - fine boring. machine tool), while the fine boring must be carried out in the machining center. Since the rough and finish machining are not performed on the same machine tool, the positioning references used are different, which leads to the inconsistency of the coaxiality of the rough and finish machining holes and black spots in the fine boring holes. , The roughness of the hole is poor, and problems such as not meeting the requirements occur. And on the one hand, the machining center has a lot of processing technology content, and the processing cycle is long, which is the bottleneck of the en...

AI Technical Summary

Problems solved by technology

[0002] The processing of the sand hole of the engine block has always been a difficult technical problem in the workshop. The existing processing technology includes rough expansion - expansion - fine boring, a total of three processing procedures, of which the rough expansion can be performed on the processing machine tool machine tool), while fine boring must be carried out in the machining center. Since the rough and finish machining are not performed on the same machine tool, the positioning datums used are different, which leads to the inconsistency of the coaxiality of the rough and finish machining holes and black spots in the fine boring holes. , the roughness of the hole is poor, and problems such as not meeting the requirements occur

And on the one hand, the machining center has a lot of processing technology content, and the processing cycle is long, which is the bottleneck of the entire line processing cycle. It is hoped to avoid the process steps in the machining center as much as possible; Processing 60 pieces requires one tool change, which not only increases the production cost, but also takes a long time to adjust the tool, resulting in a long processing cycle

Images