Processing method of crosshead pin of low-speed diesel engine for MAN-series ship

Abstract

The invention discloses a processing method of a crosshead pin of a low-speed diesel engine for a MAN-series ship. The crosshead pin comprises a large outer circle and two small outer circles, the twosmall outer circles are coaxially connected to the two sides of the large outer circle respectively, center holes are formed in the end surfaces of the two sides of the small outer circles, and the outer periphery of the large outer circle is provided with a notch plane. The processing method comprises the following specific steps that 1, a boring machine is used for machining the two end surfaces and the notch plane of the crosshead pin in a horizontal station; 2, two centers are adopted for clamping workpieces on a lathe, and machining the large outer circle, the small outer circles and endsurfaces; 3, the boring machine is used for precisely machining all holes in the notch plane and the circumference in a vertical station; 4, a grinding machine is used for grinding the large outer circle and the small outer circles in a supporting and grinding mode; and 5, the polishing lathe is used for clamping the workpieces and polishing the crosshead pin workpieces through two centers. The processing method has the advantages that the procedures are few, the process route is short, the number of times of getting on is small, the processing efficiency of the crosshead pin is greatly improved, the labor intensity of operators is reduced, and the effects of saving time and labor are achieved.

Description

technical field [0001] The invention relates to a manufacturing process of a marine low-speed diesel engine, in particular to a processing method for a crosshead pin of a MAN series marine low-speed diesel engine, and belongs to the technical field of mechanical processing. Background technique [0002] The crosshead pin is an important precision part and key moving connection part of the marine low-speed diesel engine. Its main function is to connect the connecting rod and the piston rod, and install sliders at both ends, guided by the guide plate of the frame, pushed up by the piston rod , down reciprocating motion, and drives the connecting rod and the crankshaft to rotate, thereby pushing the ship forward and backward. see figure 1 , the crosshead pin of the MAN series marine low-speed diesel engine is a large short-shaft part, mainly including a large outer circle 1 in the middle and a small outer circle 2 at both ends. The end faces 4 on both sides of the small outer ...

AI Technical Summary

Problems solved by technology

The entire process requires 16 times of loading and unloading, which requires a lot of auxiliary processing time, which is no cutting time without iron chips, resulting in low processing efficiency

[0017] In the traditional crosshead pin processing method, it is necessary to get on and off the machine many times because of the need to ensure the machining accuracy of the part. For example, when the lathe (rough turning) is machined, because the balance of the turning must be ensured, the notch plane is not processed in advance, resulting in The lifting holes on both ends cannot be processed in advance (there is an angular relationship with the notch plane), so the processing method of two tops cannot be used, so the traditional processing method of one clamping one top, one clamping one supporting can only be used

When machining on a boring machine, due to the fastening method of the workpiece, all the end face holes cannot be processed at one time, and the end face holes must be processed by a drilling machine, which also increases the time for multiple processes and loading and unloading

The grinding machine adopts the top grinding method, which increases the processing requirements of the top hole, so it is necessary to increase the vertical lathe process to finish the top holes at both ends, so the process and the time for loading and unloading are also increased.

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