Method for machining valve guide pipe hole and valve base ring hole through horizontal milling machine

Abstract

The invention discloses a method for machining a valve guide pipe hole and a valve base ring hole through a horizontal milling machine. A one-time positioning method is adopted, a cylinder cover is overturned by 90 degrees, and the axis of the valve guide pipe hole and the axis of the valve base ring hole are made to be parallel with a workbench face; then the workbench face is rotated; in this way, a machine tool main shaft can be aligned with the axis of the valve guide pipe hole and the axis of the valve base ring hole; and then by means of a bottom hole drilling process, a coarse broaching process, a finish broaching process and a finish milling process, the position precision, the size precision, the cylindricity, the straightness and the like of the valve guide pipe hole are guaranteed. The machining process is simple and convenient, precision is high, cost is low, and a good technological effect can be achieved without a special machine tool.

Description

technical field [0001] The invention relates to the field of machining, in particular to a method for machining valve guide holes and valve seat ring holes by using a horizontal milling machine. Background technique [0002] Usually, for the processing of the valve guide hole and valve seat ring on the cylinder head for scientific research and trial production and small batch production, because its structure and size have not been fully finalized, the axes of the cylinder head valve guide hole and valve seat ring are not in line with the bottom surface of the cylinder head. Vertical, but a certain angle with the bottom surface of the cylinder head, the general processing method can not meet the requirements. If special-purpose machine tools or machining centers are used for processing, although the processing requirements can be met, corresponding equipment must be purchased, which undoubtedly increases research costs for scientific research and trial production. However, ...

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Problems solved by technology

[0002] Usually, for the processing of the valve guide hole and valve seat ring on the cylinder head for scientific research trial production and small batch production, because its structure and size have not been fully finalized, the axis of the cylinder head valve guide hole and valve seat ring is not in line with the bottom surface of the cylinder head. Vertical, but at a certain angle with the bottom surface of the cylinder head, the general processing method cannot meet the requirements

If special-purpose machine tools or machining centers are used for processing, although the processing requirements can be met, corresponding equipment must be purchased, which undoubtedly increases research costs for scientific research and trial production.

However, if ordinary machine tools are used for processing, different datums need to be used to position the cylinder head multiple times, and it is difficult to ensure the coaxiality of the cylinder head valve guide hole and the valve seat ring, as well as the cylindricity and straightness of the valve guide hole

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