Method for processing slant oil hole in middle-speed machine crankshaft

Abstract

The invention relates to a method for processing an oblique oil hole of a crankshaft of a medium speed machine. A gun drill with length-diameter ratio of 30:1 is adopted for drilling and cutting; the drilling and cutting process of the gun drill comprises the drilling and cutting of a guide hole and an oil hole; the diameter of the guide hole is larger than that of the gun drill by 0.01 to 0.02 mm; the depth of the hole is double of the diameter of the gun drill; in the process of drilling and cutting the guide hole, high-pressure mixed cold air is used to spray and cool temperature; chips are discharged; the oil hole is drilled and cut by stages; a short gun drill drills first and machines the oil hole to the depth of between 300 and 310 mm; after the gun drill passes through a crossed hole, a long gun drill replaces the short gun drill and drills and machines the oil hole to the depth of 709 mm to the crossed hole; a plug is used to plug the processed oblique oil hole; the plug is fixed by screw threads; the gap part of the crossed hole is sealed; and the guide hole is drilled and cut by stages. A phi 20 oblique oil hole of a 6PC crankshaft is machined according to the method, not only can ensure the quality of a product, but also greatly improve production efficiency.

Description

technical field [0001] The invention relates to a method for machining oblique oil holes in the crankshaft of a medium-speed machine. Background technique [0002] The main component of the ship is the diesel engine, and the core component of the diesel engine is the crankshaft. However, the processing of the crankshaft has many processes and the long route has become the bottleneck of the shipbuilding industry. The crankshaft processing progress and quality directly affect the delivery of new ships. For example, the 6PC2-6 crankshaft used to be imported from abroad, and the processing equipment used was a turning-milling compound machining center. However, our company's ordinary CNC machine tools have no processing schemes that can be used for reference. The 6PC2-6 crankshaft is the largest crankshaft among medium-speed diesel engine crankshafts. The crankshaft has the characteristics of high machining accuracy, large metal removal rate, large number of holes, small and de...

AI Technical Summary

Problems solved by technology

In addition, the two oblique oil holes of the same crank are perpendicular to the adjacent crank obliquely crossing 14 (see Figure 6), the drill bit processed at the cross hole is easy to break, the gun drill carbide is only 40 long, and the cross part is 45 long, so it cannot be drilled

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