Machining method for oblique hole in cylinder liner hole of cylinder block of diesel engine

Abstract

The invention discloses a processing method for inner oblique holes of cylinder sleeve holes of a diesel engine cylinder body. A plurality of cylinder sleeve holes and four vertical holes around the cylinder sleeve holes are formed in the cylinder body; four oblique holes are formed in each cylinder sleeve hole; each oblique hole is communicated with each vertical hole at an angle of 90 degrees; the four oblique holes are uniformly distributed and respectively form angles of 45 degrees, 135 degrees, 225 degrees and 315 degrees together with the horizontal plane. The processing method is characterized in that the cylinder body is clamped on a numerical control floor type boring and milling machine, and the oblique holes are automatically processed on a workpiece one-step clamping station through a numerical control program instruction by adopting an automatic right-angled head connected to a main shaft of the numerical control floor type boring and milling machine and an inner-cooling tool clamped on the automatic right-angled head. The processing method has the advantages that operation is safe, quick and convenient and has the beneficial effects that the processing efficiency is improved and the product quality are achieved; the processing method can be used for processing a large diesel engine cylinder body and is suitable for processing other large parts on the numerical control floor type boring and milling machine.

Description

Technical field [0001] The invention relates to a processing method of mechanical parts, in particular to a processing method for oblique holes in cylinder bores of diesel engine cylinder blocks, and belongs to the technical field of mechanical processing. Background technique [0002] Cylinder block is one of the important parts of high-power and low-speed marine diesel engine. Its volume and weight are large, and the use of suitable processing equipment and methods is a key issue in its processing technology. See figure 1 , The figure shows a schematic structural diagram of the cylinder block of a large marine diesel engine 6S70MC, in which the cylinder liner bore 1 of the cylinder block is provided with an oblique hole 2, the oblique hole 2 penetrates the vertical hole 3 and is 90° with the vertical hole 3; There are four oblique holes 2 in a cylinder sleeve hole 1, evenly distributed at an angle of 45° or 135° with the horizontal plane. The vertical hole 3 can be machined in...

AI Technical Summary

Problems solved by technology

The vertical hole 3 can be processed on a horizontal station, while the inclined hole 2 is inside the cylinder liner hole 1. Due to the limitation of diameter and length, the right-angled accessories of general machine tools cannot meet the specific size and angle requirements, so it is difficult to reach Due to the spatial position of the inclined hole 2 in the cylinder liner hole 1, it is difficult to perform traditional machining on the inclined hole 2 with the existing right-angle accessories. The method obviously has the following shortcomings and deficiencies:

[0003] 1. The positioning of the marking line is not accurate, there is a certain size error, and sometimes it cannot meet the size requirements of the drawing;

[0004] 2. The tool used by the fitter to manually match the drill is an iron-absorbing drill. On the one hand, the contact surface between the iron-absorbing drill and the workpiece is a circular arc surface, which is not easy to locate. It has high requirements for the fitter's physical strength and operating skills. On the one hand, the processing tool of the iron-absorbing drill can only be a twist drill, which needs to be fed little by little during processing, which is very inefficient and consumes a lot of man-hours, and the most important thing is the inner surface of the processed inclined hole 2 It is very rough and requires manual grinding and smoothing;

[0005] 3. Due to the large volume of the cylinder block parts, the operator needs to climb up to work, and there is a great safety hazard in the operation. Once the operator slips and falls, the consequences will be very serious; in addition, it takes a lot of auxiliary time to climb or lift a large escalator. poor condition

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