Rough boring tool and method for machining main bearing hole of diesel engine frame

Abstract

A rough boring tool and method for machining the main bearing hole of a diesel engine base, comprising: a boring bar body, 8 rough boring tools, a boring tool pressing block, a positioning component and a calibration component; the tool installation grooves on the boring bar body have different depths For the first use, it is necessary to adjust the size of the tool by trial cutting, and use the positioning component to position it; afterward, the main bearing hole of the same size will be processed again, and the positioning component will be used for positioning and clamping, and the calibration component will be used for calibration and then processed directly. The invention has the advantages of convenient operation and controllable quality, and has the beneficial effects of improving processing efficiency and ensuring product quality. It can be used for rough machining of main bearing holes of large diesel engine frames, and is also suitable for machining other milling machines on CNC horizontal gantry milling machines. Rough boring of large parts.

Description

technical field [0001] The invention relates to a processing method of a mechanical part, in particular to a rough boring tool and a method for processing a main bearing hole of a diesel engine frame, and belongs to the technical field of mechanical processing. Background technique [0002] The engine base is one of the important parts of the high-power low-speed marine diesel engine. It is long in length and heavy in weight. The processing of the main bearing hole is the key point in the processing of the engine base parts. The main bearing holes of high-power low-speed marine diesel engines are generally large-diameter holes, with a minimum diameter of about 600mm and a maximum diameter of more than 1200mm. The requirements for the dimensional accuracy, roughness, and coaxiality of the main bearing hole are very high, so there is a lot of rough machining allowance during blank forging. Generally, the reserved allowance is about 12mm on one side. After welding, the thickne...

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Problems solved by technology

[0007] 1. The first method is rough boring with wrong teeth. When the allowance is too large, the depth of cut is too large, resulting in abnormal vibration. At this time, the feed needs to be reduced accordingly. In extreme cases, it is even necessary to divide the rough machining by 2 cutters, thus increasing the man-hour and reducing the processing efficiency

[0008] 2. The second method is double-edged rough boring. Although the feed is fast, at least 2 rough borings are required, and even 3 rough borings are required in extreme cases, so the efficiency is low

[0009] 3. Method 1 and Method 2 require repeated trial cutting, measurement, and adjustment of the size of the tool for each boring tool, so it takes a lot of man-hours

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