A device for grinding and polishing the intake and exhaust edges of blades

Abstract

The present invention discloses a device for grinding and polishing the inlet and outlet edges of blades, including a frame, a sand belt driving motor, a frame base and a floating grinding and polishing assembly, wherein the floating grinding and polishing assembly includes: a floating frame, a frame floating proportional cylinder, a lower floating arm floating proportional cylinder, a lower floating grinding and polishing contact body, a lower floating arm, a floating arm hinge, an upper floating grinding and polishing contact body, an upper floating arm, an upper floating arm floating proportional cylinder, a camshaft driving motor, a grinding and polishing frame, a linear bearing rod, and a linear bearing sleeve, wherein the grinding and polishing frame is fixedly connected to the linear bearing rod, and the linear bearing rod is movably installed in the linear bearing sleeve. The present invention has stable grinding and polishing performance, and the arc segments of the inlet and outlet edges are evenly ground and polished, and the performance is stable and reliable; the grinding and polishing efficiency and precision are high, and there are no connection marks between face areas and excessive roundness.

Description

Technical Field

[0001] The invention relates to the technical field of blade processing, in particular to a device for grinding and polishing the intake and exhaust edges of blades. Background Art

[0002] At present, the technical requirements and quality requirements of blades (such as blades for gas turbines, steam turbines, fans, energy wind power and other equipment) are getting higher and higher. The last processing step is blade grinding and polishing. Most of them are done manually in China, and some blade companies in the world use automatic grinding and polishing. There are few equipment and processes on the market that can grind and polish the intake and exhaust edges with high efficiency, stable and reliable quality.

[0003] In the industry, there are two main processing methods for grinding and polishing the intake and exhaust edges of blades: manual grinding and automated grinding using robots or five-axis.

[0004] The blade has very high requirements for the contour accuracy of each section of the inlet and outlet edges. For example, the basic requirement for the accuracy of each section of the finished blade of an aircraft engine is between ±0.02 and ±0.05mm. Due to the differences in industries such as steam turbines and gas turbines, the grinding allowances left in the previous process are different. For example, after the inlet and outlet edges of the blade are milled with a ball-end milling cutter in the previous process, there are peaks and troughs between the tool tracks, but the processing is within the error accuracy range. According to the process requirements, it needs to be polished to the required roughness.

[0005] The requirements for the grinding and polishing process are high. For manual grinding and polishing, the operator grinds on the rotating polishing abrasive or uses a handheld sandpaper to grind the air inlet and outlet edges. The grinding depends entirely on the personal experience of the grinder. Due to the different physical conditions and working conditions of each person, the disadvantage is that in actual production, the slightest negligence of the action may cause the grinding to exceed the tolerance. In terms of maintaining the accuracy of the air inlet and outlet edges, the consistency is poor and the efficiency is not high.

[0006] Most automated equipment for grinding the inlet and outlet edges uses suspended sanding belts and grinding wheels with high hardness, and uses arc-divided trajectories to approximate the arc. Since the thickness of the inlet and outlet edges in the middle and lower parts of the blade body is different, the programming of the equipment is relatively complicated. The disadvantage of this method is that the debugging time of the inlet and outlet edge grinding program is relatively long; at the same time, there is also the possibility that some parts of the arc surface of the inlet and outlet edges are over-grinded, resulting in damage to the accuracy and an out-of-tolerance phenomenon.

[0007] Another example is a polishing wheel for polishing the inlet and outlet edges of blades with announcement number CN 202219460U. It is made of two pieces of non-grinding circular sandpaper bonded together, strung together with a rod-type tool, and fixed at the ends. It can be installed on various power heads to clamp, grind and polish the inlet and outlet edges of blades. The advantages of this grinding wheel are its simple structure and easy operation. At the same time, there are also some shortcomings. The amount of grinding and removal of the top of the inlet and outlet edges during grinding and polishing is quite different from that of the non-top curved surface, especially when the inlet and outlet edges of the blades are thicker, this problem is more obvious. Summary of the invention

[0008] The object of the present invention is to provide a device for grinding and polishing the intake and exhaust edges of blades to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A device for grinding and polishing the inlet and outlet edges of blades, comprising a frame, a sanding belt driving motor, a frame base and a floating grinding and polishing assembly, wherein the floating grinding and polishing assembly comprises: a floating frame, a frame floating proportional cylinder, a lower floating arm floating proportional cylinder, a lower floating grinding and polishing contact body, a lower floating arm, a floating arm hinge, an upper floating grinding and polishing contact body, an upper floating arm, an upper floating arm floating proportional cylinder, a camshaft driving motor, a grinding and polishing frame, a linear bearing rod, and a linear bearing sleeve, wherein the frame floating proportional cylinder is fixedly mounted on the floating frame, and the cylinder rod end thereof is fixedly connected to the frame base, the floating frame is slidably mounted on the frame base, the grinding and polishing frame is fixedly connected to the linear bearing rod, and the linear bearing rod is movably mounted in the linear bearing sleeve, the camshaft driving motor is mounted on the floating frame, the camshaft driving motor output shaft is connected to the camshaft, and a cam groove matching the camshaft is provided on the grinding and polishing frame;

[0011] The upper floating arm and the lower floating arm are both rotatably connected to the grinding and polishing machine frame, and the upper floating arm floating proportional cylinder and the lower floating arm floating proportional cylinder are installed on the grinding and polishing machine frame at the upper and lower parts of the upper floating arm and the lower floating arm respectively; the upper floating arm and the lower floating arm ends are respectively installed with an upper floating grinding and polishing contact body and a lower floating grinding and polishing contact body.

[0012] As a further solution of the present invention: the abrasive belt driving motor, the abrasive belt tensioning wheel, and the end surfaces of the upper floating grinding and polishing contact body and the lower floating grinding and polishing contact body are respectively wound with abrasive belts.

[0013] As a further solution of the present invention: the upper floating grinding and polishing contact body and the lower floating grinding and polishing contact body are both rollers rotatably mounted on the upper floating arm and the lower floating arm.

[0014] As a further solution of the present invention: adhesive paper is attached to the surfaces of the upper floating grinding and polishing contact body and the lower floating grinding and polishing contact body.

[0015] As a further solution of the present invention: the abrasive belt adopts a velvet soft backing abrasive belt or a film backing abrasive belt.

[0016] As a further solution of the present invention: the upper floating arm floating proportional cylinder and the lower floating arm floating proportional cylinder are both rotatably connected to the grinding and polishing machine frame.

[0017] As a further solution of the present invention: the sanding belt driving motor is a servo motor.

[0018] As a further solution of the present invention: the camshaft drive motor is a variable frequency motor or a servo motor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The grinding and polishing performance of the present invention is stable. The adjustable floating constant pressure of the cylinder is applied to the front, upper and lower wrapped sand belts, and the circular arc segments on the entire intake and exhaust edge instant cross section are subjected to adjustable and equal constant pressure grinding. The circular arc segments of the intake and exhaust edge are evenly ground and polished, and the performance is stable and reliable.

[0021] 2) The grinding and polishing efficiency is high. Since the frequency of the left and right reciprocating motion is adjustable and the floating pressure of the abrasive belt wrapping is adjustable, the grinding intensity can be programmed. Since the speed of the automatic actuator from one end of the intake and exhaust side to the other end is adjustable, programming is simple;

[0022] 3) The self-sharpening property of the abrasive belt in the grinding environment is approximately constant. After a grinding and polishing track segment of any length on one side is realized, the blade is lifted up, and the abrasive belt drive motor drives the feeding of the abrasive belt grinding segment with a custom line length, thereby ensuring the constant self-sharpening property during grinding and polishing;

[0023] 4) Compared with the current grinding and polishing of the inlet and outlet edges, the grinding and polishing equipment has high contour accuracy of the inlet and outlet edges of the blades, no connection marks between the face areas, and excessive roundness; the roughness value of each part is stable; the connection and transition between the inlet and outlet edges and the transition R tangent point are smooth, and the effect is obvious;

[0024] 5) It can realize stable and controllable high-quality automated grinding and polishing of the blade inlet and outlet edges. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the floating grinding and polishing assembly in one direction of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the floating grinding and polishing assembly in the present invention in another direction. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 3 In an embodiment of the present invention, a device for grinding and polishing the intake and exhaust edges of blades includes a frame 1, a protective cover 2, a sanding belt drive motor 3, a sanding belt tensioning wheel 4, a frame base 6 and a floating grinding and polishing assembly 7, wherein the sanding belt drive motor 3 and the sanding belt tensioning wheel 4 are respectively wound with a sanding belt 5, and the sanding belt 5 is driven to move by the sanding belt drive motor 3, and the floating grinding and polishing assembly 7 includes: a floating frame 71, a frame floating proportional cylinder 72, a lower floating arm floating proportional cylinder 73, a lower floating grinding and polishing contact body 74, a lower floating arm 75, a floating arm hinge 76, an upper floating grinding and polishing contact body 77, an upper floating arm 78, an upper floating arm floating proportional cylinder 79, a camshaft drive motor 710, a grinding and polishing frame 711, a linear bearing rod 712, and a linear bearing sleeve 713, the frame floating proportional cylinder 72 is fixedly mounted on the floating frame 71, and the end of its cylinder rod is fixedly connected to the frame base 6. The floating frame 71 is slidably mounted on the frame base 6, and the floating frame 71 can be driven by the frame floating proportional cylinder 72 to move linearly along the frame base 6. The grinding and polishing frame 711 is fixedly connected to the linear bearing rod 712, and the linear bearing rod 712 is movably mounted in the linear bearing sleeve 713. The camshaft driving motor 710 is mounted on the floating frame 71, and the output shaft of the camshaft driving motor 710 is connected to the camshaft, and a cam groove matching the camshaft is provided on the grinding and polishing frame 711 (refer to the camshaft structure, not shown in the figure). The camshaft is driven by the camshaft driving motor 710, so that the grinding and polishing frame 711 can be driven to perform reciprocating linear motion along the linear bearing sleeve 713;

[0030] The upper floating arm 78 and the lower floating arm 75 are both rotatably connected to the grinding and polishing machine frame 711 through the floating arm hinge 76. The upper floating arm floating proportional cylinder 79 and the lower floating arm floating proportional cylinder 73 are installed on the grinding and polishing machine frame 711 at the upper and lower parts of the upper floating arm 78 and the lower floating arm 75, respectively, which can drive the upper and lower floating arms to rotate around the floating arm hinge 76, and the upper and lower floating arm floating proportional cylinders are rotatably connected to the grinding and polishing machine frame 711.

[0031] An upper floating grinding and polishing contact body 77 and a lower floating grinding and polishing contact body 74 are respectively installed at the ends of the upper floating arm 78 and the lower floating arm 75. The upper floating grinding and polishing contact body 77 and the lower floating grinding and polishing contact body 74 are rollers rotatably installed on the upper floating arm 78 and the lower floating arm 75.

[0032] The sanding belt drive motor 3 is a servo motor that drives the sanding belt according to the programming instructions. The sanding belt drive motor 3 is a servo motor. Each instruction sanding belt 5 feeds the length to achieve stable self-sharpening of the sanding belt 5 at each stage. The entire sanding belt 5 is respectively wound around the sanding belt drive motor 3, the sanding belt tensioner 4 and the front end of the upper and lower floating grinding and polishing contact body. The upper and lower floating grinding and polishing contact body is driven by the adjustable floating ratio cylinder through the upper and lower floating arms. At the same time, the frame floating ratio cylinder 72 drives the floating frame 71 to move. The three work together to make the sanding belt 5 attached to the arc of the inlet and outlet edges of the blade. The camshaft drive motor 710 drives the grinding and polishing frame 711 to complete reciprocating motion, thereby completing the grinding and polishing of the inlet and outlet edges of the blade. The camshaft drive motor 710 is a variable frequency motor or a servo motor, which can realize the control of the grinding and polishing intensity of different areas.

[0033] Adhesive paper is attached to the surface of the upper floating grinding and polishing contact body 77 and the lower floating grinding and polishing contact body 74, and the sanding belt 5 adopts a velvet soft backing sanding belt or a film backing sanding belt. After this type of sanding belt backing contacts with the adhesive paper, it will not move under normal external force, and has better stability during the reciprocating grinding process when the sanding belt is attached to the inlet and outlet edges with a certain pressure.

[0034] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for grinding and polishing the intake and exhaust edges of blades, comprising a frame (1), a sanding belt drive motor (3), a frame base (6) and a floating grinding and polishing assembly (7), characterized in that: The floating grinding and polishing assembly (7) comprises: a floating frame (71), a frame floating proportional cylinder (72), a lower floating arm floating proportional cylinder (73), a lower floating grinding and polishing contact body (74), a lower floating arm (75), a floating arm hinge (76), an upper floating grinding and polishing contact body (77), an upper floating arm (78), an upper floating arm floating proportional cylinder (79), a camshaft drive motor (710), a grinding and polishing frame (711), a linear bearing rod (712), and a linear bearing sleeve (713), wherein the frame floating proportional cylinder (72) is fixed The floating frame (71) is mounted on the floating frame, and the end of the cylinder rod is fixedly connected to the frame base (6). The floating frame (71) is slidably mounted on the frame base (6). The grinding and polishing frame (711) is fixedly connected to the linear bearing rod (712). The linear bearing rod (712) is movably mounted in the linear bearing sleeve (713). The camshaft drive motor (710) is mounted on the floating frame (71). The output shaft of the camshaft drive motor (710) is connected to the camshaft. A cam groove matching the camshaft is provided on the grinding and polishing frame (711). The upper floating arm (78) and the lower floating arm (75) are both rotatably connected to the grinding and polishing frame (711), and an upper floating arm floating proportional cylinder (79) and a lower floating arm floating proportional cylinder (73) are installed on the grinding and polishing frame (711) at the upper and lower parts of the upper floating arm (78) and the lower floating arm (75), respectively; An upper floating grinding and polishing contact body (77) and a lower floating grinding and polishing contact body (74) are respectively installed at the ends of the upper floating arm (78) and the lower floating arm (75).

2. The device for grinding and polishing the intake and exhaust edges of blades according to claim 1, characterized in that: The sanding belt driving motor (3), the sanding belt tensioning wheel (4), and the end surfaces of the upper floating grinding and polishing contact body (77) and the lower floating grinding and polishing contact body (74) are respectively wound with sanding belts (5).

3. The device for grinding and polishing the intake and exhaust edges of blades according to claim 2, characterized in that: The upper floating grinding and polishing contact body (77) and the lower floating grinding and polishing contact body (74) are both rollers rotatably mounted on the upper floating arm (78) and the lower floating arm (75).

4. The device for grinding and polishing the intake and exhaust edges of blades according to claim 3, characterized in that: Adhesive paper is attached to the surfaces of the upper floating grinding and polishing contact body (77) and the lower floating grinding and polishing contact body (74).

5. The device for grinding and polishing the intake and exhaust edges of blades according to claim 4, characterized in that: The sanding belt (5) is a velvet soft backing sanding belt or a film backing sanding belt.

6. The device for grinding and polishing the intake and exhaust edges of blades according to claim 1, characterized in that: The upper floating arm floating proportional cylinder (79) and the lower floating arm floating proportional cylinder (73) are both rotatably connected to the grinding and polishing machine frame (711).

7. The device for grinding and polishing the intake and exhaust edges of blades according to claim 1, characterized in that: The sanding belt driving motor (3) is a servo motor.

8. The device for grinding and polishing the intake and exhaust edges of blades according to claim 1, characterized in that: The camshaft drive motor (710) is a variable frequency motor or a servo motor.

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