A boring and milling compound processing technology and device

Abstract

A boring and milling combined machining technology and device are suitable for semifinishing and finish machining of cylinder holes, connecting rod holes and box holes. The device comprises a precision machine tool spindle, a boring cutter rod, a fine adjustment mechanism, an electric spindle, a dense tooth milling cutter, an outer detecting instrument and an outer compensation control unit. The technology comprises the steps that the machining allowance of the previous procedure of a machined hole serves as the total adjustment amount of the radial position of the dense tooth milling cutter, the distance between the axis of the electric spindle and the axis of the machine tool spindle is changed through the fine adjustment mechanism, and radial feed is achieved by adjusting the radial position of a cutting point of the dense tooth milling cutter; and the machine tool spindle drives the boring cutter rod, the fine adjustment mechanism, the electric spindle and the dense tooth milling cutter to jointly do the low-speed rotation movement, the dense tooth milling cutter does the high-speed rotation movement, the detecting instrument is utilized for obtaining the deviation value between the cutting point of the dense tooth milling cutter and the ideal position, the radial position of the cutting point of the dense tooth milling cutter on a machined workpiece is subjected to fine adjustment under the control of the fine adjustment mechanism through the compensation control unit according to the obtained deviation value, and therefore the radial position of the cutting point can be automatically offset.

Description

Technical field [0001] The invention relates to a processing technique and device, in particular to a boring-milling compound processing technique and device suitable for semi-finishing and finishing of cylinder holes, connecting rod holes and box holes, and belongs to the technical field of mechanical processing. Background technique [0002] The processing quality of connecting rod end holes, cylinder holes and other box bearing holes will directly affect the performance of parts. Semi-finish boring and fine boring, as the key process of hole processing, have always been concerned by many researchers. The traditional boring process has the characteristics of low speed and low feed rate. In particular, the single-tooth boring tool uses point contact processing for finishing parts, which has the characteristics of low efficiency, and the hole surface is left with feed Knife marks. As a result, in order to meet the special surface requirements of hole finishing, additional milli...

AI Technical Summary

Problems solved by technology

The management of tool life has great uncertainty. A series of factors such as processing parameters, workpiece material, workpiece shape, and lubrication will have an impact on tool milling loss, so it is difficult to use experience to predict tool life.

The current reactive maintenance method is time-consuming and expensive, which not only greatly increases the operating cost of the enterprise, but also seriously affects the production efficiency of the enterprise

[0004] For the machining process of precision boring bars, it is generally difficult for the boring tools used in enterprise workshops to achieve accurate compensation for micro-movements

Automatic compensation for tool nose milling loss is not only time-consuming and labor-intensive but also a qualitative judgment, which is difficult to realize due to the influence of mechanism clearance and elastic deformation

There was a thread differential fine-tuning structure for micro-adjustment of the boring tool, but because the adjustment structure occupies a space that affects the boring of the small hole, the shortcoming of the adjustment structure itself being deformed and damaged has affected further promotion.

Patent No. CN88200208U proposes a high-precision eccentric fine-tuning boring device, because there are wearing parts and gear rings that affect the adjustment accuracy and retention

Patent No. CN2357865Y discloses a mechanism for fine-tuning the boring bar through screw and insert positioning. The structure is simple and suitable for manual fine-tuning, but the joint surface between the insert and the insert groove is difficult to process. The interference affects the fine-tuning effect of the boring tool, and the function of automatic tool compensation cannot be realized

Patent No. CN201110196379.4 adopts "L-shaped right-angle lever + four-link combined flexible hinge mechanism" to realize the radial displacement of the tool, but the structure is relatively complicated and the control efficiency is not high

Patent No. CN201410334409.7 discloses a helical milling device, which includes a rotation system, a revolution system, a feed system, and an eccentricity adjustment system. It also has a complex structure and the problem that the radial feed cannot be accurately controlled.

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