Opposite cutter machining method for inclined half face of main bearing hole of diesel engine for vessel

Abstract

The invention discloses an opposite cutter machining method for an inclined half face of a main bearing hole of a diesel engine for a vessel, which is characterized by adopting two right-angular measurement blocks, and enabling two acute angles of the right-angular measurement blocks to be respectively a 25-degree angle and a 65-degree angle; utilizing a milling cutter arranged on a numerical control planer type milling machine to form a half face machining line on the end face of a workpiece; reserving machining allowance according to the finished product size of 25-degree half face and a 65-degree half face, and utilizing a vertical milling cutter to respectively machine a 25-degree measurement reference face and a 65-degree measurement reference face in a numerical control mode; utilizing the right-angular measurement blocks to measure the measurement reference faces to determine whether the measurement reference faces meet the requirements; then utilizing the vertical milling cutter to finish machining according to the finished product size of the 25-degree half face, and utilizing the right-angular measurement blocks to measure and determine whether the 25-degree half face meets the requirements; and finally utilizing the vertical milling cutter to finish machining the 65-degree half face, and utilizing the right-angular measurement blocks to determine whether the 65-degree half face meets the requirements. The opposite cutter machining method for the inclined half face of the main bearing hole of the diesel engine for the vessel is simple and convenient to operate and can ensure processing accuracy.

Description

technical field [0001] The invention relates to a processing method for an inclined half surface of a main bearing hole of a marine diesel engine. Background technique [0002] The marine low-speed diesel engine designed by German MAN company is the most advanced diesel engine in the world, and it is a new compact diesel engine with high technical content. Such as Figure 1a , Figure 1b and Figure 1c As shown, the main bearing hole 1 is composed of the bearing seat 2 and the bearing cover 3 on the diesel engine frame. In order to make the two fit more closely and withstand the heavy load of the crankshaft, the half surface of their joint is designed as Two mutually perpendicular slopes, one slope is 25° to the horizontal, which is called the 25° Hough surface 4, and the other slope is 65° to the horizontal, which is called the 65° Hough surface 5. The bearing seat 2 and the bearing cap 3 Locating with a pin 6 Locating. [0003] The Hough surface has relatively strict d...

AI Technical Summary

Problems solved by technology

[0007] When machining the 25° Hough surface, the aperture error of the measurement reference hole, the error of the sharp edge at the intersection of the main bearing hole and the Hough surface, and the error of the positioning pin all affect the measurement accuracy, reducing the 25° Hough surface and the product. precision

[0008] Machining the sloped Huff surface based on the main bearing hole may cause misalignment of the positioning pin hole on the main bearing seat and the positioning pin hole on the bearing cover when the original workpiece coordinate system is used as the reference, causing the positioning pin to not be installed quality accident

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