Damping boring bar

Abstract

The invention discloses a shock-absorbing boring bar which comprises a boring bar sleeve, an inner boring bar body, a driving mechanism and a locking device, wherein the inner boring bar body is restricted in the circumferential direction and led in an inner hole of the boring bar sleeve in the axial direction. The driving mechanism drives the inner boring bar body to stretch for a certain suspension length out of the boring bar sleeve in a suspension mode, and the locking device is used for locking the inner boring bar body and the boring bar sleeve tightly at a target overhanging length. The shock-absorbing boring bar is high in adaptability and can effectively restrain flutter.

Description

technical field [0001] The invention relates to a damping boring bar. Background technique [0002] During the boring process, the boring bar is in an overhang state, and generally the overhang length does not exceed 10 times its diameter, otherwise it will easily cause vibration. When the boring bar vibrates, the surface roughness of the processed workpiece increases, the dimensional tolerance increases, and the boring tool is easily damaged. The vibration of the boring bar can also cause the vibration of the machine tool and cause damage to the machine tool. Therefore, boring machining is a key topic of research by many scholars and engineers. [0003] Some literature points out (NT Engineering Company Y. Komai and Nakagawa writings), the regenerative chatter problem that occurs in the metal cutting process cannot be ignored, and in the fine boring process, it should be prevented that the tool is damaged by high-frequency vibration exceeding 10KHz. The problem of reduce...

AI Technical Summary

Problems solved by technology

The clamping end of this type of boring bar is located at the rear end, the overhanging part of the boring bar body is weak, and the vibration damping block is bulky, so it cannot be clamped and fixed

Although this type of boring bar has a good vibration reduction effect, it can withstand a small amount of cutting and the cutting efficiency is low

[0008] 2. The use conditions of the boring bar are relatively harsh

There are many types of lathes. The vibration frequency and rigidity of the tool holders of different lathes are very different, while the performance parameters of the boring bar are fixed. The cutting vibration of the same boring bar on different lathes is very different. Bars that work very well, may also vibrate on some lathes, which greatly increases the risk of using the bar

[0009] 3. When the diameter of the boring bar is large and the overhang is long, the eccentric load moment of the boring bar system is large during the boring process, which directly causes deformation and vibration of the relevant parts of the machine tool

The end of the boring bar equipped with the boring tool is supported on the inner surface of the workpiece through a slider with a spring in the formed hole. This structure changes the support at one end of the boring bar to the support at both ends, but this support cannot effectively restrain The problem with the vibration of the boring bar is that the crawling of the support point itself causes a certain vibration, and the spring only produces vibration damping, but this damping will amplify the vibration frequency

And the adjustment of each cutting is relatively troublesome

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