Low-speed diesel engine half surface processing method

The invention discloses a low-speed diesel engine half surface processing method. The method comprises the following steps: 1) checking inclination angle of an attachment head specially used for a machine tool; 2) calculating horizontal direction coordinates and vertical direction coordinates of a half slope intersection point at the left side of a base; 3) rotating a coordinate system to obtain a new coordinate system; 4) writing a base half surface numerical control machining specific program, machining a half 25-degree slope at the left side of the base to a required size, and making allowance for a half 90-degree slope at the left side of the base; 6) repeating the step above to enable a half 25-degree slope at the right side of the base to be machined to a required size, and making allowance for a half 90-degree slope at the right side of the base; 7) calculating machining allowance E of the half 90-degree slopes at the two sides of the base; and 8) writing a base half surface numerical control machining