A machining tool for high-precision elongated holes and its machining method

Abstract

The invention discloses a machining tool for high-precision elongated holes and a machining method thereof, which is characterized in that: the machining tool is integrally composed of a cylindrical boring part, a reaming part and a clamping part; It is fixedly connected with the rear end of the reaming part; a reamer groove is provided on the outer peripheral surface of the reaming part, and a reamer is arranged in the reamer groove; the front end of the reaming part is fixedly connected with the rear end of the boring part, and the The front end of the boring part is provided with a boring tool; during processing, firstly, the workpiece is rough-machined to obtain a slender hole, and the cutting allowance of the rough machining is controlled to be 1-2mm, and then the machining tool of the present invention is used to perform half-precision machining on the slender hole. Boring, high-precision reaming and surface strengthening extrusion can complete the processing of high-precision elongated holes. The machining tool of the invention has the advantages of simple structure, low cost, simple machining process, high machining efficiency, machining precision up to IT6 level, and the surface roughness of the machined holes can reach Ra0.4-1.6.

Description

technical field [0001] The invention belongs to the field of metal machining, and in particular relates to a special cutting tool and a process method for machining high-precision slender deep holes. Background technique [0002] In the process of mechanical manufacturing and machining, it is often necessary to process some inner holes with high precision, large depth and small diameter. It is difficult for ordinary common machining tools and commercially available machining tools to meet the machining requirements of high-precision elongated holes. Technicians often use a variety of processing techniques, using different types of machine tools, tools of different types and precision, to process the workpiece step by step, so as to obtain high-precision slender deep holes. This kind of processing method using multiple machine tools and multiple steps has complicated processing technology, and a little carelessness may lead to processing failure. Moreover, this processing me...

AI Technical Summary

Problems solved by technology

This kind of processing method using multiple machine tools and multiple steps has complicated processing technology, and a little carelessness may lead to processing failure. Moreover, this processing method is inefficient, time-consuming and laborious, and the processing accuracy is difficult to guarantee.

Chinese patent CN203030986U discloses a tool for reaming deep and long holes. The tool has a simple structure and is easy to manufacture, but it can only be used for reaming. Hole processing tool, including cutter body and rough boring part, scraping part and rolling part, the tool structure is complex, difficult to manufacture, and high cost

Chinese patent CN102152118A discloses an automatic expansion and contraction scraping and rolling combination deep hole tool, which has high machining accuracy and can automatically expand and contract during use, but also has complex structure, difficult manufacture and high cost.

Patent CN201791990U is used to process high-precision slender deep holes with special tools. It is difficult to enter holes without chamfers, and the surface density and wear resistance of the inner holes are low.

The deep and long hole casting mold invented by the Advanced Technology Research Center of the General Institute of Mechanical Science and Technology can replace the cutting tool to reduce the cost, but the processing accuracy is low, and it is difficult to meet the high-precision processing requirements.

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