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Method for processing trepanning of crankshaft crank red trepanning hole for large-scale ship and special trepanning drill

A technology of nesting drill and crank throw, which is applied in the field of nesting processing and special nesting drill of large-scale marine crankshaft crank red bushing hole, which can solve the difficult processing of the next finishing process, consume a lot of energy, and the next finishing process Process difficulties and other problems, to achieve the effect of improving production and operating efficiency, ensuring product quality, and controlling production cycle

Inactive Publication Date: 2011-08-31
SHANGHAI HEAVY MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no guarantee that the cut workpiece will be 100% qualified
Flame cutting consumes a lot of energy, and it is easy to produce thick yellow smoke during flame cutting, which pollutes the environment
Flame cutting needs to reserve a large rough machining allowance, which brings difficulties to the next finishing process; because the surface of the workpiece after flame cutting is relatively hard, the allowance is unevenly distributed, and the reserved rough machining allowance is large, Therefore, it is difficult to process the next finishing process.

Method used

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  • Method for processing trepanning of crankshaft crank red trepanning hole for large-scale ship and special trepanning drill
  • Method for processing trepanning of crankshaft crank red trepanning hole for large-scale ship and special trepanning drill
  • Method for processing trepanning of crankshaft crank red trepanning hole for large-scale ship and special trepanning drill

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Embodiment Construction

[0024] The large-scale marine crankshaft mentioned in the present invention refers to the marine crankshaft adopted by ships with more than 10,000 tons. The nesting processing of the large-diameter inner hole of the crank throw refers to the processing of the inner hole of Φ708mm or larger (Φindicates the diameter in the field of mechanical processing). For general boring processing, machining the Φ708mm inner hole does not belong to the large diameter inner hole processing, but it is quite large for the nesting processing of the Φ708mm inner hole, so it is called the crank throw "large diameter Inner hole" nesting processing.

[0025] Said nesting processing refers to adopting the nesting drilling operation method, processing with a hollow drill bit (called a nesting drill, or ring drill), and a mandrel remains in the center of the workpiece after processing. Compared with direct drilling, the advantage of nesting processing is that the dimensional accuracy required by the w...

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Abstract

The invention discloses a method for processing a trepanning of a crankshaft crank red trepanning hole for a large-scale ship, wherein the diameter of the red trepanning hole is more than 708mm, a trepanning drill is fixedly arranged on a chuck disc of a main shaft box of a machine tool, and the trepanning of the crank red trepanning hole is processed by means of machinery processing; and a corresponding angle between cutting edges of knife blades on the two end points of the trepanning drill is 165 degrees, the trepanning drill is guided and supported by using three supports, and cutting scraps are directly discharged by means of external scrap discharge. The invention also discloses the trepanning drill used in the method and a method for taking materials after the trepanning. The invention ensures the processing quality and the manufacture cycle of workpieces with energy-saving and environmental protection.

Description

technical field [0001] The invention relates to a mechanical processing method, in particular to a method for processing the nesting material of the large-diameter inner hole (red sleeve hole) of a large-scale marine crankshaft. The invention also relates to a special trepanning drill used in said method. Background technique [0002] The crankshaft is one of the most important parts of the marine crankshaft. The shape and structure of the crankshaft are as follows figure 1 , 2 shown. The processing quality and cycle of the crankshaft red set hole 10 are one of the key factors to check the annual output of the crankshaft [0003] At present, the rough machining of the red sleeve hole 10 of the crank throw all adopts the operation mode of pre-drilling an aperture and then carrying out flame cutting. Using this process method, each bell crank must be preheated to a certain temperature before cutting, otherwise cracks will easily occur. However, there is no guarantee that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B41/00B23B51/04
Inventor 李友发刘巽强张海阳程志家沈尧荣
Owner SHANGHAI HEAVY MACHINERY PLANT
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