A boring and grinding composite processing technology

Abstract

The invention discloses a combined boring and honing machining process. The combined boring and honing machining process is suitable for semi-finish machining and finish machining of cylinder body holes, connecting rod holes and box body holes. A device formed by a precise machine tool spindle, a boring cutter bar, a fine adjustment mechanism, an electric spindle, a sand wheel, an external detection instrument and an externally-arranged compensation control unit is adopted. In operation, the machine tool spindle drives the boring cutter bar, the fine adjustment mechanism, the electric spindle and the sand wheel to do low-speed rotation motion together, meanwhile the sand wheel is driven by the electric spindle to do high-speed rotation motion, and the motion of a sand wheel cutting point is formed by combining two rotation motions; and the deviation value of the sand wheel cutting point and the ideal position is obtained through the detection instrument, the compensation control unit controls the fine adjustment mechanism according to the obtained deviation value to finely adjust the radial position of the sand wheel relative to the cutting point of a workpiece to be machined so as to automatically compensate the radial position of the cutting point, and the finish machining dimension requirement of holes is met. The combined boring and honing machining process has the beneficial effects that the process is simple, a cutter is long in service life, and machining cost is low.

Description

technical field [0001] The invention relates to a composite processing technology, in particular to a boring-grinding composite processing technology suitable for semi-finishing and finishing processing 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 the large and small end holes of the connecting rod, the cylinder hole and other box bearing holes will directly affect the performance of the parts. As the key process of hole machining, semi-finish boring and fine boring have attracted the attention of many researchers. The traditional boring process has the characteristics of low speed and low feed rate, especially the single-tooth boring tool is used for point contact processing to finish the parts, which has the characteristics of low efficiency, and the feed rate is left on the surface of the hole. of knife marks. As a result, in order to meet the s...

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 wear, 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 tip wear, due to the influence of mechanism clearance and elastic deformation, is not only time-consuming and laborious, but also a qualitative judgment, which is not easy to realize

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 announcement number CN2357865Y discloses a mechanism for fine-tuning the boring tool bar through the positioning of the screw rod and the insert. Although the structure is simple and suitable for manual fine-tuning, the joint surface between the insert and the insert groove is difficult to process. Pin position interference affects the fine-tuning effect of the boring tool, and the function of automatic tool compensation cannot be realized

Patent No. CN201110196379.4 discloses a "L-shaped right-angle lever + four-bar combined flexible hinge mechanism", which can realize the radial displacement of the tool, but its 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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