Aluminum alloy inner hole ultra-precise machining tool and machining method

Abstract

The invention discloses an aluminum alloy inner hole ultra-precise machining tool and machining method. The aluminum alloy inner hole ultra-precise machining tool comprises a round bar tool handle made of a hard alloy, and a blade. The tool nose part of the blade is cut to add a sleeking edge. The side face included angle alpha of the sleeking edge is 85 degrees, the front face included angle betaof the sleeking edge is 84 degrees, the top rake theta of the sleeking edge is 7 degrees, the tool nose of the sleeking edge is of a small arc structure, the structure is practical in function, workpieces are not likely to be scratched, and the precision of the machined workpieces is effectively improved. The aluminum alloy inner hole ultra-precise machining method adopting the aluminum alloy inner hole ultra-precise machining tool includes the steps of inner hole rough boring machining, semi-fine boring machining and fine boring machining, the workpiece rotation speed, the boring cutter feedrate and the cutting depth are stipulated in each step, it can be ensured that the aluminum alloy inner hole roughness is not larger than 0.2 micrometer, and ultra-precise machining is achieved. Thealuminum alloy inner hole ultra-precise machining tool and the aluminum alloy inner hole ultra-precise machining method are easy to operate, high in machining precision and high in machining efficiency, the machining cost is reduced, and practicability is high.

Description

technical field [0001] The invention relates to an aluminum alloy inner hole superfinishing tool and a processing method, belonging to the field of mechanical engineering finishing. Background technique [0002] The hole is an important surface on the box, bracket, sleeve, ring, and disc parts, and it is also a surface that is often encountered in machining. With the continuous development of science and technology, there is more and more demand for various parts with inner holes, and the precision is getting higher and higher. More and more inner holes need to meet the requirements of ultra-finishing. [0003] However, in the case of the same machining accuracy and surface roughness requirements, machining holes is more difficult than machining outer circular surfaces, especially aluminum alloy parts, because of their high aluminum and copper content, soft materials and high viscosity. , so there are the following deficiencies in the processing process: (1) The size of the...

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Problems solved by technology

[0003] However, in the case of the same machining accuracy and surface roughness requirements, machining holes is more difficult than machining outer circular surfaces, especially aluminum alloy parts, because of their high aluminum and copper content, soft materials and high viscosity. , so there are the following deficiencies in the processing process: (1) The size of the tool is limited by the size of the hole to be processed, so the rigidity of the tool is poor, and a large cutting amount cannot be used, the productivity is low, and the processing cost is high; (2) In the processing During the process, the vibration of the tool is relatively large, which has a great impact on the machining accuracy and surface finish of the parts, and cannot meet the requirements of superfinishing; (3) For the machining of the inner hole of the viscous aluminum alloy parts, it is easy to cause the sticking phenomenon, which not only affects The processing efficiency is high, and it is easy to scratch the processing surface; (4) The tool is surrounded by the processing hole, the heat dissipation condition is poor, the chips are difficult to discharge, the coolant is not easy to enter the cutting area, and the chips are easy to scratch the processing surface

To sum up, in the prior art, there is no equipment or method that can satisfy the superfinishing of aluminum alloy inner holes, which restricts the development of my country's economy and needs to be improved urgently.

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