Co-drilling and reaming processing method and equipment for marine low-speed diesel engine crankshaft flywheel

Abstract

The invention relates to a method and a device for simultaneous drilling and reaming processing of a crankshaft and a flywheel of a marine low-speed diesel engine. A portable device consisting of a light hole drilling machine, a tool setting device and a cutter is adopted and mounted on the crankshaft through an engine base, a mounting plate and other mounting components; the method comprises the steps as follows: firstly, the tool setting device and a sustain-head bolt are used for ensuring the cutting feed direction and the coaxiality and the parallelism of the axial lines of simultaneous drilling and reaming processing holes, then, a corresponding cutter is selected according to the sizes of the simultaneous drilling and reaming processing holes, the amount of feed and the rotary speed of the cutter are adjusted, and the processing is performed. After each cutting, the degree of finish and the circumference of each hole are checked, if necessary, the cutter is replaced for cutting until all projects reach the standard, and processing is performed until all holes meet the quality requirements. The method and the device for simultaneous drilling and reaming processing of the crankshaft and the flywheel of the marine low-speed diesel engine have the advantages of small occupied area, portability, simplicity in operation, low cost, ensured accuracy, high universality and the like and can be used for simultaneous drilling and reaming processing of the crankshaft, the flywheel and other simultaneous drilled and reamed parts.

Description

technical field [0001] The invention relates to the processing of marine low-speed diesel engines, in particular to a co-drilling and reaming processing method and equipment for pre-drilling crankshafts and flywheels of large marine low-speed diesel engines, and belongs to the technical field of mechanical manufacturing. Background technique [0002] As the core component of the marine low-speed diesel engine main engine, the crankshaft plays a vital role in power output. The components of the marine low-speed diesel engine are all large parts, and their volume is very large. The bore of the main engine ranges from 600mm to 980mm. Among them, the total weight of the crankshaft of the 6S60MCC main engine with a relatively small bore is 70t, and the total weight of the crankshaft of the large-bore 8K98MC main engine reaches 262t. The crankshaft weight of the main engine of 10S90MEC (10 cylinders, bore 900mm) has reached 383t. [0003] The connecting parts on the crankshaft ar...

AI Technical Summary

Problems solved by technology

Although the crankshaft in the form of a drill template does not need to be reprocessed, sometimes there is a problem of small deviations in the connecting holes, and the cost is also high; before the crankshaft in the form of pre-drilled holes is connected to the flywheel, the corresponding pre-drilled holes on the crankshaft and flywheel must be carried out at the same time. Drilling and reaming, that is, to complete the drilling and reaming processing of the corresponding pre-drilled holes on the two components in the same process. At present, the same drilling and reaming processing generally relies on the radial drilling machine, although the accuracy and efficiency of the same drilling and reaming using the radial drilling machine are relatively Higher, and can also process holes parallel to the horizontal plane or at an angle in the 360° direction, but this method still has the following defects:

[0005] 1. Due to the heavy weight of the crankshaft body, it is difficult to lift, position, fix, and turn over the workpiece on the radial drilling machine;

[0006] 2. Before and after drilling, the crankshaft needs to be transferred twice before it can go back and forth between the radial drilling platform and the crankshaft flywheel installation area, so the load capacity of the transfer equipment is very high;

[0007] 3. The radial drilling machine must be operated by professionals who have passed the examination and obtained certificates. They must be familiar with the structure and performance of the equipment before they can operate independently; in addition, equipment maintenance also requires the help of professionals, so the radial drilling machine and drill reamer are suitable for the operators. There are certain limitations;

[0008] 4. The cost of putting into production the whole set of radial arm drilling equipment and laying the platform is relatively high. During the use process, it is necessary to do regular maintenance on the lubrication system, cooling system, spindle tool box and circuit system of the whole set of equipment, so the initial investment and later period of the equipment High investment;

[0009] 5. The radial drilling machine needs to occupy a large area of ​​the site, and cannot realize flexible and convenient mobile operations. The workpiece can only be transported to the machine tool for processing

[0010] Judging from the current situation, except for the use of radial drills, it is difficult for other small equipment to ensure the same drilling and reaming accuracy requirements

At present, for the supply status of crankshaft pre-drilling, technical equipment that can simultaneously meet drilling accuracy, easy operation, low cost, and high versatility is still blank. Therefore, the research and development of such portable co-drilling and reaming technical equipment seems to particularly urgent

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