CNC abrasive belt grinding machine of steam turbine blade

Abstract

The invention discloses a CNC abrasive belt grinding machine of a steam turbine blade and relates to CNC processing equipment for grinding the profile of a steam turbine blade, which can control the mutual movement relationship between a contact wheel and a blade curved profile, thereby effectively avoiding the undercutting and overcutting while grinding. The CNC abrasive belt grinding machine comprises a machine tool body, a worktable, a headstock, a tailstock, a slipway, a horizontal turntable, a vertical turntable and an abrasive belt grinding head. Five servo control shafts can realize linkage control, three of the servo control shafts are rotary servo control shafts, and two are linear moving servo control shafts; an X-servo shaft controls the longitudinal feeding-grinding movement of the blade; a Z-servo shaft controls the horizontal feeding-grinding movement of the blade; an A-servo shaft does rotary grinding movement of the blade; a B-servo shaft leads the grinding head to swing around a perpendicular shaft; a C-servo shaft leads the grinding head to swing around a horizontal shaft; the X-shaft is vertical to the Z-shaft; and the A-shaft rotary axis has equal height with the C-shaft rotary axis. The CNC abrasive belt grinding machine has the characteristics of high grinding efficiency, good grinding accuracy, concise structure, low cost and simple and convenient operation.

Description

technical field [0001] The invention relates to a numerical control processing device for grinding and processing the surface of a steam turbine blade, in particular to a numerical control abrasive belt grinder which clamps the blade on a machine tool and uses an abrasive belt to complete grinding of the curved surface of the blade. Background technique [0002] The steam turbine blade is complex in shape and requires high machining accuracy. It is an important part of the steam turbine engine unit and one of the most difficult parts in the steam turbine. The patent number ZL200720033896.9 announced by the State Intellectual Property Office, titled "Steam Turbine Blade CNC Abrasive Belt Grinder" patent technology, provides a four-axis linkage CNC machine tool for blade surface grinding, with two rotary axes , Two linear axes, which can realize the grinding of straight blades of steam turbines or blades with small twists. [0003] Because the abrasive belt grinding process o...

AI Technical Summary

Problems solved by technology

Therefore, when the above-mentioned four-axis CNC abrasive belt grinder grinds ordinary twisted blades, since there are only two rotary servo control axes, it is difficult to meet the requirement that the tool axis vector is located in the direction of the minimum curvature of the grinding point, so it will always be accompanied by Larger undercut or overcut phenomenon, but can not meet the expected blade grinding quality requirements

[0004] In addition, among the above-mentioned patented technologies, such as image 3 As shown, there is no guide wheel on the abrasive belt grinding head device, the wrap angle between the abrasive belt 28 and the contact wheel 26 is small, and there is interference between the abrasive belt 28 and the blade during grinding; the tension wheel 25 is adjusted by an eccentric mechanism , the adjustment amount is small, and the abrasive belt 28 cannot be guaranteed to work under the condition of constant tension; at the same time, the driving wheel 24 needs to be driven by the belt, and the mounting seat 27 is set horizontally, etc., which makes the structure of the patented technology complex, low transmission efficiency, and inconvenient to adjust

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