CNC milling-grinding-polishing composite processing machine tool and method for blades

Abstract

The invention discloses a blade CNC milling, grinding and polishing compound processing machine tool and its method, which mainly solves the problem of unstable processing accuracy caused by multi-process clamping, which can only be processed in a single process on a single machine tool at present in the processing process of the multi-part structure of the blade. Inefficiency problem. The machine tool includes column, bed, workbench, six linear axes and four rotary axis components. On the double T-shaped bed, there are two columns for X-direction workbench and Y1, Y2 movement. The workbench is equipped with A turntable that realizes 360°A rotation, a torque motor is installed on the slide plate of the milling column to drive the milling head frame to swing in the B1 direction, and a torque motor is installed on the slide plate of the belt grinding column to drive the belt grinding head frame to swing in the B2 direction , The upper end of the abrasive belt grinding head frame is provided with a C-axis gear mechanism, and a normal N-axis motor is installed on the top of the C-axis. The invention has reasonable and ingenious structural design, integrates milling, grinding, polishing and measuring functions into one, and has great practical value and popularization value.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and relates to the manufacture of complex curved surface parts such as blades, and specifically relates to a blade CNC milling, grinding and polishing compound processing machine tool. Background technique [0002] Blades are the key core parts of steam turbines, aero engines, etc., and their precision and surface quality determine the working efficiency and reliability of the main engine to a large extent. The blade is usually made of difficult-to-machine materials. The blade surface is a space free curved surface with complex shape. The fillet at the root of the blade body is composed of multiple circular arcs with variable diameters. The smallest can reach 0.1 ~ 0.2mm, and some blades have a damping platform or ribs in the middle of the blade body. At present, the following equipment and methods are mainly used for processing blades at home and abroad: [0003] 1) Ordinary blades use ...

AI Technical Summary

Problems solved by technology

[0007] 1. The two processes of CNC milling and CNC grinding and polishing of blades are carried out separately on two types of machine tools. The secondary clamping of blades will inevitably cause clamping errors, which will affect the manufacture of high-precision blades;

[0008] 2. Due to the limitation of the belt width effect in the abrasive belt grinding and polishing process, it is impossible to grind and polish the dead corners such as the damping platform and the blade root fillet of the blade. Only manual grinding of these local positions of the blade can be used to remove the knife marks ;

[0009] 3. Manually grinding the blade damping table and the root fillet of the blade body has high technical requirements for workers, the grinding labor load is heavy, and the working environment is harsh. It is difficult to improve the blade production efficiency and the processing quality is even more difficult to guarantee;

[0010] 4. Thin-walled blades made of difficult-to-machine materials will inevitably produce processing stress during milling and abrasive belt grinding. These stresses will be gradually released during processing and cause complex deformation of the blade profile, requiring final precision grinding pre-processing In order to correct, the existing multi-axis linkage abrasive belt grinding machine cannot be installed on the grinding head part due to its special structure. The machine measurement device can only be used for external measurement and then CNC programming for abrasive belt grinding processing, resulting in too long auxiliary time , which greatly affects the manufacturing efficiency of high-quality blades;

[0011] 5. At least three types of equipment, such as blade CNC milling machine, CNC abrasive belt grinder, and manual grinder, are used alone to realize the status quo of complete blade surface processing, which not only increases the equipment procurement cost of the blade factory, but also increases the difficulty of maintenance management and workshop The degree of congestion also restricts the development of the lean production technology level of the current blade factory

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