Connecting-rod deep hole grinding method for marine low-speed diesel engine and special honing device

Abstract

The invention provides a connecting-rod deep hole grinding method for a marine low-speed diesel engine and a special honing device. The connecting-rod deep hole grinding method comprises the followingsteps: 1, grinding machined traces at a rounded corner of a deep hole by using a long-handle plane grinding head; 2, grinding relatively deep vibration knife marks and machined traces as well as spiral lines near an orifice of the deep hole by using a plane grinding head; 3, grinding and smoothening the entire hole wall by using the special honing device, wherein the special honing device comprises a honing head, a universal quick-change adapter and a pneumatic motor and is mounted on an extension rod, the hole wall of the deep hole is tightly supported through an elastic structure, the special honing device is driven by a pneumatic grinder to rotate, the rotating speed of the special honing device is adjusted by using a speed reducer, and then the uniform and efficient deep hole grindingoperation is achieved; 4, grinding burrs and shallow traces in the deep hole by using a sand impeller head; 5, removing waste and burrs on the hole wall by using a steel wire brush; 6, cleaning the hole wall; and 7, carrying out repairing and grinding till quality testing is passed. According to the connecting-rod deep hole grinding method provided by the invention, the grinding effect is uniform, the operation is simple, both the time and the effort are saved, and the entire grinding effect on the deep hole in a connecting rod is improved.

Description

technical field [0001] The invention relates to a manufacturing process device for a marine low-speed diesel engine, in particular to a method for grinding a deep hole of a connecting rod of a marine low-speed diesel engine and a special honing device, belonging to the technical field of mechanical processing. Background technique [0002] The center of the connecting rod body of the marine diesel engine is equipped with a small-diameter center hole D that runs through the connecting rod body and connects the crank pin bearing hole and the crosshead pin bearing hole. It is an important passage for the bearing bush rotating lubricant in the bearing holes at both ends. See figure 1 , the diameter of the central hole D is between Φ35-60, and the depth of the hole exceeds 2 meters. The central hole D is difficult to process. After the processing is completed, the fitter needs to grind it to remove the processing spiral lines, middle part vibration lines, hole wall pull lines and...

AI Technical Summary

Problems solved by technology

The traditional deep hole grinding of the connecting rod is to use the method of lengthening the air grinder, the extension rod and the surface grinding head to grind the deep hole. The problem is that the diameter of the surface grinding head is usually smaller than the hole diameter. During the grinding process, due to The output speed of the air grinder is high, the torque is large, and it is inconvenient for the operator to control the direction of the grinding head; secondly, because the grinding head is in partial contact with the hole wall, the grinding depth is difficult to control, resulting in uneven grinding lines; in addition, because the deep hole The bottom of the hole is a rounded structure, and the vibration pattern at the rounded corner is difficult to polish

After grinding, the effect of grinding in the observation hole through the electronic endoscope is poor, the product quality is difficult to guarantee, and it affects the acceptance of the workpiece

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