A CNC blade tip grinding machine for automatically simulating the radius of a gas turbine blade

Abstract

This invention discloses an automatic CNC blade tip grinding machine that simulates the radius of a gas turbine blade. It is a dedicated grinding machine for machining the outer arc of heavy-duty gas turbine blade tips. This grinding machine is an adaptive arc grinding machine for blades of different radii, comprising a frame, a blade tip grinding assembly, an adaptive radius device, a blade oscillation drive assembly, a rotary table, and an operation box. This invention utilizes a combination of digital control and grinding to process blades made of high-temperature nickel-based alloy materials, improving product quality and enabling the machining of blade tips of different radii on a single machine, thus increasing machine utilization and reducing production costs. This invention simulates the actual operating scenario of a turbine blade, ensuring that the blade tip arc dimension is close to the actual installation, reducing errors. Simultaneously, the simulated radius can be adjusted to achieve different turbine blade tip machining.

Description

Technical Field

[0001] This invention relates to a heavy-duty gas turbine blade tip external arc grinding machine, specifically a blade tip CNC grinding machine that automatically simulates the radius of a gas turbine blade. Background Technology

[0002] Gas turbine blades rotate at high speed during operation, and friction occurs when the blade tips are in close contact with the retaining ring. After prolonged operation, the wear on the blade tips becomes significant. During repair, it is necessary to weld over the blade tips to increase their height, re-grind them to create a rounded shape, and restore them to their original dimensions.

[0003] Currently, Huarui Company repairs blade tip dimensions through manual grinding. During the grinding process, to accurately control the dimensions, frequent measurements of the blade tip height are required, leading to significant physical exertion for operators. Grinding efficiency is inconsistent, daily workload is difficult to predict accurately, causing difficulties in work scheduling and potentially wasting time. Huarui Company repairs a wide variety of blades with varying lengths, and the tip tilt angles of Siemens and GE blades also differ considerably. Manual adjustment of the grinding equipment is required before grinding the tips of different blades, which is time-consuming. Errors can occur during manual equipment adjustments, leading to blade rework and further wasting time. Therefore, it is necessary to design an automatic CNC blade tip grinding machine that simulates the radius of a gas turbine blade. This machine should be programmed to adapt to different blade models, automatically grinding the blade tip and controlling the dimensions, thereby reducing labor costs and improving production efficiency. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the present invention provides the following solution to solve the above-mentioned problems: a CNC blade tip grinding machine for automatically simulating the radius of a gas turbine blade, comprising a frame (1), a radius adjustment assembly (2), a blade oscillation drive assembly (3), a worktable feed drive assembly (4), and a grinding assembly (5).

[0005] The blade oscillation drive assembly (3) and the grinding assembly (5) are respectively mounted on both sides of the grinding machine.

[0006] The blade oscillation drive assembly (3) further includes an X-axis lead screw and nut mechanism (31), a servo motor (32), an X-axis moving slide (33), a cross ball bearing (34), a rotation center shaft (35), an intermediate slide (36), a Y-axis slide (37), and a guide shaft fixing bracket (38). The X-axis lead screw and nut mechanism (31) is connected to the servo motor (32), the X-axis moving slide (33) is connected to the X-axis lead screw and nut mechanism (31), the cross ball bearing (34) is located below the X-axis moving slide (33), the rotation center shaft (35) is connected to the cross ball bearing (34), the Y-axis slide (37) is mounted on the intermediate slide (36), the intermediate slide (36) and the rotation center shaft (35) are fixed on the X-axis moving slide (33), and the guide shaft fixing bracket (38) is connected below the Y-axis slide (37).

[0007] The radius adjustment assembly (2) and the table feed drive assembly (4) are located at the center of the grinding machine and are placed side by side.

[0008] The radius adjustment assembly (2) further includes a movable screw nut mechanism (21), a radius adjustment base (22), a bearing seat (23), a bearing pressure plate (24), a shaft core (25), a tapered roller bearing (26), a guide shaft opening fixing bracket (27), a guide shaft (28), a movable guide rail (29), and a slide plate (30). The movable guide rail (29) is located on the far left of the radius adjustment assembly (2), and the slide plate (30) moves on the movable guide rail (29) through the screw nut mechanism (21). The radius adjustment base (22) is located on the right side of the slide plate (30), and the movable screw nut mechanism (21) is located on the left center of the radius adjustment assembly (2). The shaft core (25) is connected to the bearing seat (23) and the bearing pressure plate (24) through the tapered roller bearing (26). The guide shaft (28) is located on the right side of the shaft core (25), and the guide shaft opening fixing bracket (27) wraps around the guide shaft (28) and is located on the outside of the guide shaft (28).

[0009] The worktable feed drive assembly (4) includes a lead screw (41), a lead screw nut seat (42), a Y-axis servo motor (43), a Y-axis linear guide (44), and a worktable (45). The lead screw (41) is connected to the lead screw nut seat (42), the Y-axis servo motor (43) is connected to the lead screw (41), and the Y-axis linear guide (44) is located at the bottom of the worktable and fixed on the Y-axis slide plate (37) to support the worktable (45). The worktable (45) achieves feed movement through the servo motor (32) and the lead screw (41).

[0010] Preferably, the change in the moving distance of the X-axis moving slide (33) can control the swing angle of the Y-axis slide (37).

[0011] Preferably, the servo motor (32) drives the X-axis lead screw nut mechanism (31) to enable the X-axis moving slide (33) to achieve linear motion.

[0012] Preferably, the Y-axis slide (37) is connected to the radius adjustment assembly (2) via the guide shaft (28), and the Y-axis slide (37) swings around the radius adjustment assembly (2) to make the X-axis moving slide (33) move.

[0013] Preferably, the guide shaft opening fixing bracket (27) is mounted on the shaft core (25), and a tapered roller bearing (26) is mounted on the shaft core (25) to form a radius rotation center point. This point moves on the moving guide rail (29) via the slide plate (30), thereby changing the distance from the rotation center shaft (35) in the blade oscillation drive assembly (3) and thus changing the rotation radius, thereby making it suitable for turbine blades of different radii.

[0014] The technical effects and advantages of this invention are as follows:

[0015] This invention utilizes a combination of digital control and grinding to process high-temperature nickel-based alloy blades, improving product quality and enabling the processing of blade tips of different radii to be completed on a single machine, thereby increasing machine utilization and reducing production costs.

[0016] This invention simulates the actual operating scenario of turbine blades, ensuring that the blade tip arc size is close to the actual installation to reduce errors. At the same time, the simulation radius can be adjusted to achieve different turbine blade tip processing. Attached Figure Description

[0017] Figure 1 A front view of a CNC blade tip grinding machine for automatically simulating the radius of a gas turbine blade according to the present invention;

[0018] Figure 2 for Figure 1 The left view;

[0019] Figure 3 for Figure 1 Top view;

[0020] Figure 4 A cross-sectional view of radius adjustment assembly 2;

[0021] Figure 5 This is a cross-sectional view of the blade oscillation drive assembly 3;

[0022] Figure 6 This is a cross-sectional view of the table feed drive assembly 4;

[0023] Figure 7 This is a schematic diagram showing the connection relationship between the radius adjustment assembly 2, the blade oscillation drive assembly 3, and the table feed drive assembly 4;

[0024] Figure 8 This is a schematic diagram showing the connection relationship between the blade oscillation drive assembly 3 and the table feed drive assembly 4.

[0025] In the diagram: 1. Frame; 2. Radius adjustment assembly; 21. Moving screw and nut mechanism; 22. Radius adjustment base; 23. Bearing housing; 24. Bearing pressure plate; 25. Shaft core; 26. Tapered roller bearing; 27. Guide shaft opening fixing bracket; 28. Guide shaft; 29. ​​Moving guide rail; 30. Slide plate.

[0026] 3. Blade oscillation drive assembly: 31. X-axis lead screw and nut mechanism, 32. Servo motor, 33. X-axis moving slide, 34. Cross ball bearing, 35. Rotation center shaft, 36. Intermediate slide, 37. Y-axis slide, 38. Guide shaft fixing bracket.

[0027] 4. Worktable feed drive assembly: 41. Lead screw, 42. Lead screw nut seat, 43. Y-axis servo motor, 44. Y linear guide, 45. Worktable, 5. Grinding assembly. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides, for example Figure 1-6 The CNC blade tip grinding machine shown includes an automatic simulation of the radius of a gas turbine blade, comprising a frame 1, a radius adjustment assembly 2, a radius oscillation drive assembly 3, a table feed drive assembly 4, and a grinding assembly 5.

[0030] The blade oscillation drive assembly 3 and the grinding assembly 5 are respectively mounted on both sides of the grinding machine. The blade oscillation drive assembly 3 further includes an X-axis lead screw and nut mechanism 31, a servo motor 32, an X-axis moving slide 33, a crossed ball bearing 34, a rotary center shaft 35, an intermediate slide 36, a Y-axis slide 37, and a guide shaft fixing bracket 38.

[0031] The X-axis lead screw and nut mechanism 31 is located at the center of the blade oscillation assembly 3 and is used to control the movement of the blade in the X-axis direction. The servo motor 32 is connected to one side of the X-axis lead screw and nut mechanism 31 and drives the lead screw and nut mechanism by controlling the rotational motion, thereby controlling the movement of the blade.

[0032] The X-axis moving slide 33 moves in the X-axis direction via a combination of the screw and nut in the lead screw and nut mechanism 31. It is connected to a crossed ball bearing 34 to ensure smooth movement. The crossed ball bearing 34 is located below the X-axis moving slide 33, providing support and guidance to ensure stable movement of the slide.

[0033] The intermediate slide 36 is fixed to the rotation center shaft 35 on the X-axis moving slide 33 and can move with the rotation center shaft 35. The intermediate slide 36 is located at the bottom of the Y-axis slide 37, and its movement in the Y-axis direction is controlled by the movement of the intermediate slide 36.

[0034] The guide shaft fixing bracket 38 is connected below the Y-axis slide plate 37, providing support and fixing of the guide shaft 28. The servo motor 32 drives the X-axis lead screw nut mechanism 31 to make the X-axis moving slide plate 33 achieve linear motion.

[0035] The radius adjustment assembly 2 and the table feed drive assembly 4 are located at the center of the grinding machine and are placed side by side. The radius adjustment assembly 2 further includes a movable lead screw and nut mechanism 21, a radius adjustment base 22, a bearing seat 23, a bearing pressure plate 24, a shaft core 25, a tapered roller bearing 26, a guide shaft opening fixing bracket 27, a guide shaft 28, a movable guide rail 29, and a slide plate 30.

[0036] The movable guide rail 29 is located on the far left of the radius adjustment assembly 2, and the slide plate 30 moves on the movable guide rail 29 through the lead screw and nut mechanism 21; the radius adjustment base 22 is located on the right side of the slide plate 30 as a support, and the movable lead screw and nut mechanism 21 is located on the left side of the radius adjustment assembly 2. The central bearing seat 23 is located above the radius adjustment base 22 and is used to support the shaft core 25.

[0037] The tapered roller bearing 26 is positioned above the bearing housing 23 and is fixed by the bearing pressure plate 24. The shaft core 25 is connected to the tapered roller bearing 26 and can move within the bearing housing 23 to achieve radius adjustment. A guide shaft 28 is located to the right of the shaft core 25 and provides guidance. A guide shaft opening fixing bracket 27 surrounds the guide shaft 28 and is located on the outside of the guide shaft 28.

[0038] The table feed drive assembly 4 includes a lead screw 41, a lead screw nut seat 42, a Y-axis servo motor 43, a Y linear guide rail 44, and a table 45. The lead screw 41 is the core component of the table feed drive assembly 4, which is used to convert rotary motion into linear motion.

[0039] The lead screw nut seat 42 is located below the worktable 45 and works in conjunction with the lead screw 41 to convert the rotational motion of the lead screw 41 into the movement of the worktable. The Y-axis servo motor 43 is mounted on one side of the lead screw 41 and drives the movement of the lead screw 41 by controlling its rotation.

[0040] The Y-linear guide 44 is located at the bottom of the worktable 45, providing guidance and support for the worktable, enabling it to move smoothly along the Y-axis. The worktable 45 is located on the Y-linear guide 44, and the feed mechanism is moved by the movement of the lead screw nut seat 42 and the lead screw 41 driven by the servo motor 32.

[0041] The Y-axis slide 37 is connected to the radius adjustment assembly 2 via the guide shaft 28. The Y-axis slide 37 swings around the radius adjustment assembly 2, thereby causing the X-axis moving slide 33 to move.

[0042] The guide shaft opening fixing bracket 27 is installed on the shaft core 25, and the tapered roller bearing 26 is installed on the shaft core 25 to form the radius rotation center point. This point moves on the moving guide rail 29 through the slide plate 30, thereby changing the distance from the rotation center shaft 35 in the blade oscillation drive assembly 3 and thus changing the rotation radius, so as to be suitable for turbine blades with different radii.

[0043] The working steps of this invention are as follows:

[0044] The blade to be ground is mounted on the worktable 45, and the positions of the radius adjustment assembly 2 and the worktable feed drive assembly 4 are adjusted as needed. Grinding parameters, such as grinding speed, depth, and precision, are set according to the grinding requirements. The servo motor 32 is started to drive the X-axis lead screw nut mechanism 31, enabling the X-axis moving slide 33 to move linearly. The moving distance of the X-axis moving slide 33 is adjusted to control the swing angle of the Y-axis slide 37. Through the linkage of the servo motor 43 and the lead screw 41, the worktable feed drive assembly 4 is started, causing the worktable 45 to move along the Y-axis. While the worktable 45 is moving, the grinding assembly 5 grinds the blade precisely according to the set parameters. The grinding position is adjusted as needed by adjusting the moving distance of the X-axis moving slide 33 and the swing angle of the Y-axis slide 37. After grinding is completed, the grinding effect is checked to ensure it meets the requirements; further adjustments and grinding can be performed if necessary. After the grinding work is completed, turn off the servo motor and the grinding machine, and perform cleaning and maintenance.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A numerically controlled grinder of blade tip for simulating radius of engine blade automatically, comprising a frame (1), a radius adjusting assembly (2), a blade swing driving assembly (3), a worktable feeding driving assembly (4), a grinding assembly (5), characterized in that: The blade oscillation drive assembly (3) and the grinding assembly (5) are respectively mounted on both sides of the grinding machine. The blade oscillation drive assembly (3) further includes an X-axis lead screw and nut mechanism (31), a servo motor (32), an X-axis moving slide (33), a cross ball bearing (34), a rotary center shaft (35), an intermediate slide (36), a Y-axis slide (37), and a guide shaft fixing bracket (38). The X-axis lead screw and nut mechanism (31) is connected to the servo motor (32), the X-axis moving slide (33) is connected to the X-axis lead screw and nut mechanism (31), and the cross ball bearing (34) is located below the X-axis moving slide (33). The rotary center shaft (35) is connected to the cross ball bearing (34), the Y-axis slide (37) is mounted on the intermediate slide (36), the intermediate slide (36) and the rotary center shaft (35) are fixed on the X-axis moving slide (33), and the guide shaft fixing bracket (38) is connected below the Y-axis slide (37); the radius adjustment assembly (2) and the worktable feed drive assembly (4) are set at the center of the grinding machine and placed side by side, wherein the radius adjustment assembly (2) further includes a moving lead screw nut mechanism (21), a radius adjustment base (22), a bearing seat (23), a bearing pressure plate (24), a shaft core (25), and tapered rollers. The assembly includes a bearing (26), a guide shaft opening fixing bracket (27), a guide shaft (28), a moving guide rail (29), and a slide plate (30). The moving guide rail (29) is located on the far left of the radius adjustment assembly (2). The slide plate (30) moves on the moving guide rail (29) via a screw and nut mechanism (21). The radius adjustment base (22) is located on the right side of the slide plate (30). The moving screw and nut mechanism (21) is located on the left center of the radius adjustment assembly (2). The shaft core (25) is connected to the bearing housing (23) and the bearing pressure plate (24) via a tapered roller bearing (26). The guide shaft (28) is located on the right side of the shaft core (25). The shaft opening fixing bracket (27) wraps around the guide shaft (28) and is located on the outside of the guide shaft (28); the worktable feed drive assembly (4) includes a lead screw (41), a lead screw nut seat (42), a Y-axis servo motor (43), a Y linear guide (44), and a worktable (45), wherein the lead screw (41) is connected to the lead screw nut seat (42), the Y-axis servo motor (43) is connected to the lead screw (41), the Y linear guide (44) is located at the bottom of the worktable, fixed on the Y-axis slide plate (37), and supports the worktable (45). The worktable (45) realizes feed movement through the servo motor (32) and the lead screw (41); The change in the moving distance of the X-axis moving slide (33) can control the swing angle of the Y-axis slide (37); The Y-axis slide (37) is connected to the radius adjustment assembly (2) via the guide shaft (28). The Y-axis slide (37) swings around the radius adjustment assembly (2) to make the X-axis moving slide (33) move.

2. The numerically controlled blade tip grinder for simulating the radius of a gas turbine engine blade as recited in claim 1, wherein: The servo motor (32) drives the X-axis lead screw nut mechanism (31) to make the X-axis moving slide (33) achieve linear motion.

3. The CNC blade tip grinding machine for automatically simulating the radius of a gas turbine blade according to claim 1, characterized in that: The guide shaft opening fixing bracket (27) is installed on the shaft core (25), and a tapered roller bearing (26) is installed on the shaft core (25) to form a radius rotation center point. This point moves on the moving guide rail (29) through the slide plate (30), thereby changing the distance from the rotation center shaft (35) in the blade oscillation drive assembly (3) and thus changing the rotation radius, so as to be suitable for turbine blades with different radii.

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