Blade blank flexible clamping fixture design method

Abstract

The invention relates to the technical field of aviation blade manufacturing, in particular to a blade blank flexible clamping fixture design method which comprises the following steps that A, a main pressing component and four auxiliary pressing components are arranged on one side in a fixture body, and a main supporting block and four auxiliary supporting components are arranged on the other side in the fixture body; the main pressing part and the main supporting block are arranged in a front-face-to-front mode, and the four auxiliary pressing parts and the four auxiliary supporting parts are arranged in a one-to-one front-face-to-front mode. B, the blade blank is clamped between the main pressing component and the main supporting block, the four auxiliary supporting components make free contact with the four corners of the blade blank correspondingly, and the four auxiliary pressing components make flexible contact with the four corners of the blade blank correspondingly and are pressed on the four corners of the blade blank; and C, the pressure of the hydraulic oil in the oil way is checked through a pressure indicator arranged on the side face of the clamp body, pressure energy of the hydraulic oil is stored through an energy accumulator arranged on the side face of the clamp body, the auxiliary pressing component conducts auxiliary flexible pressing on the blade blank, and damage to the blade blank is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of aviation blade manufacturing, and in particular to a design method for a flexible clamping fixture for a blade blank. Background Art

[0002] The commonly used blanks in the industry are mainly die forging and casting blanks, among which die forging blanks have a greater demand for the use of fixtures in mechanical processing. With the development and deep integration of advanced manufacturing technologies such as information technology, digital technology, and automation technology, aviation blade manufacturing is moving towards flexibility, automation, precision, and efficiency. Domestic aviation manufacturing companies have built more and more flexible blade processing production lines; In flexible production lines, the form of fixtures is mainly traditional blade manual fixtures. The advantages of manual fixtures are high flexibility, which can be quickly adjusted and customized according to the shape, size and processing requirements of different workpieces, and are suitable for small batch and multi-variety production; low cost, low design and manufacturing cost, simple maintenance and repair, but manual fixtures are inefficient, slow to clamp and adjust, affecting the overall efficiency of the production line; limited accuracy, affected by the workers' skill level and operating habits, it is difficult to ensure the consistency of the clamping accuracy of each workpiece, which may lead to unstable product quality; For mechanical automated fixtures, continuous production can be achieved in situations where the blanks are relatively regular, reducing manual intervention and improving equipment utilization. However, due to die forging technology, such as metal temperature, metal deformation process, die wear, etc., the dimensional consistency of die forged blade blanks varies greatly. The design basis of blade blanks is mainly designed on the blade surface, and the blade surface is usually a complex surface, which makes the design and manufacture of clamping devices difficult. In order to firmly clamp the blade, the clamping device must match the curved surface shape of the blade, otherwise it is easy to cause problems such as unstable clamping and slipping during subsequent mechanical processing. Summary of the invention

[0003] The purpose of the present invention is to provide a blade blank flexible clamping fixture design method to solve the problems in the prior art. The specific technical solution is as follows: A method for designing a flexible clamping fixture for a blade blank comprises the following steps: A. A main clamping component and four auxiliary clamping components are installed on one side of the clamp body, and a main support block and four auxiliary support components are installed on the other side of the clamp body. The main clamping component and the main support block are arranged face to face, and the four auxiliary clamping components and the four auxiliary support components are arranged face to face one by one; B. The blade blank is clamped between the main clamping component and the main support block, the four auxiliary support components are freely in contact with the four corners of the blade blank, and the four auxiliary clamping components are flexibly in contact with and clamped at the four corners of the blade blank; C. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator installed on the side of the clamp body, and store the pressure energy of the hydraulic oil through the accumulator installed on the side of the clamp body; D. The clamp body is quickly installed to a preset position through the quick connector and zero point tray provided at its lower end.

[0004] Further, in step A, the main clamping component is composed of a high-pressure linear hydraulic cylinder and a main clamping block. The high-pressure linear hydraulic cylinder is installed in the clamping body, and the output end of the high-pressure linear hydraulic cylinder is connected to the main clamping block. The high-pressure linear hydraulic cylinder controls the main clamping block to move forward, squeezing the blade blank onto the main support block.

[0005] Furthermore, the high-pressure linear hydraulic cylinder uses a linear hydraulic cylinder with a diameter of 45 mm, which can provide a clamping force of 10.3 kN at a clamping force of 15 MPa and a clamping force of 17.4 kN at a clamping force of 25 MPa.

[0006] Further, in step B, the auxiliary support component includes a hydraulic auxiliary support cylinder, four hydraulic auxiliary support cylinders are respectively installed at the four corners of the clamp body, and auxiliary support blocks are installed at the output ends of the hydraulic auxiliary support cylinders. The four hydraulic auxiliary support cylinders respectively control the forward movement of the four auxiliary support blocks, and the four auxiliary support blocks are freely in contact with the four corners of the blade blank.

[0007] Furthermore, the auxiliary clamping component includes a hydraulic auxiliary clamping cylinder, four hydraulic auxiliary clamping cylinders are respectively installed at the four corners of the clamp body, and auxiliary clamping blocks are installed at the output end of the hydraulic auxiliary clamping cylinder. The four hydraulic auxiliary clamping cylinders respectively control the forward movement of the four auxiliary clamping blocks, and the four auxiliary clamping blocks flexibly contact and clamp at the four corners of the blade blank.

[0008] Furthermore, the hydraulic auxiliary clamping cylinder includes a cylinder body, in which a plunger and a piston are slidably connected, a plunger spring is provided between the plunger and the piston, and an auxiliary clamping block is fixedly connected to the front end of the plunger. After oil is supplied to the cylinder body, the piston 15 is driven to lift up, and the plunger 14 rises under the action of the plunger spring 16. The spring force of the plunger spring 16 provides the contact force between the auxiliary clamping block and the blade blank to achieve flexible contact.

[0009] Furthermore, the supporting force of the auxiliary supporting block on the blade blank is greater than or equal to 1.5 times the pressing force of the auxiliary pressing block on the blade blank.

[0010] Furthermore, the clamp body is provided with an inclined groove 1 and an inclined groove 2, the inclined groove 1 and the inclined groove 2 are arranged face to face, and an anti-slip protrusion is provided at the front end of the auxiliary support block.

[0011] Furthermore, in step B, a measuring device is used to measure the actual position and direction of the blade blank to obtain its spatial coordinate data. The five-axis machine tool adjusts the actual processing orientation according to the spatial coordinate data to achieve precise processing of the blade blank.

[0012] Further, the clamp body includes a base, a pressure indicator and an accumulator are installed on the side of the base, a quick connector and a zero-point tray are arranged at the lower end of the base, a middle-layer support seat is rotatably connected to the upper end of the base, a left-side support seat and a right-side support seat are slidably connected to the middle-layer support seat, a screw rod is rotatably connected to the middle-layer support seat, the left-side support seat and the right-side support seat are both threadedly connected to the screw rod, an inclined groove 1 is arranged on the left-side support seat, an inclined groove 2 is arranged on the right-side support seat, a main support block and four hydraulic auxiliary support cylinders are all installed on the right-side support seat, and a high-pressure linear hydraulic cylinder and four hydraulic auxiliary pressing cylinders are all installed on the left-side support seat; A long rod is slidably connected to the base, a triangular block is provided in the middle position of the long rod, a limiting column is slidably connected to the base, a spring is provided between the inside of the base and the bottom of the limiting column, the upper end of the limiting column is inserted into the limiting hole provided on the middle support seat, the lower end of the triangular block is slidably connected to the limiting column, the long rod is fixedly connected to the plug column, the plug column is inserted into the plug hole provided on the side of the limiting column, a limiting groove is provided on the side of the base, a stopper is slidably connected in the limiting groove, the front end of the stopper is against the end of the long rod, a spring support plate is fixed to the side of the base, and a spring 2 is provided between the stopper and the spring support plate.

[0013] The advantages of the present invention are: 1. Through multi-point support and clamping, sufficient clamping force can be guaranteed to ensure that the blade blank will not vibrate or move during milling, grinding, transportation and other links. At the same time, it can adapt to the clamping of blade blanks of different sizes, with a high degree of automation and reduced manual intervention.

[0014] 2. The auxiliary pressing component performs auxiliary flexible pressing on the blade blank to avoid damage to the blade blank.

[0015] 3. The structure is simple, which reduces the difficulty of operation and maintenance cost, improves the user experience, and reduces the complexity of the system compared to the modular fixture system.

[0016] 4. In order to reduce the deformation of the blade blank during clamping, all support points and clamping points should be clamped in a one-to-one manner to prevent the generation of misalignment torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of the fixture design method of the present invention; Figure 2 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 3 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 4 The overall structure of the present invention is shown in FIG. Figure 3 ; Figure 5 It is a structural schematic diagram of the main pressing component of the present invention; Figure 6 It is a schematic diagram of the main support block structure of the present invention; Figure 7 for Figure 6 A partial enlarged view of the middle part; Figure 8 It is a structural schematic diagram of the auxiliary pressing component of the present invention; Fig. 9 The clamp body structure of the present invention is shown in FIG. Figure 1 ; Fig.10 The clamp body structure of the present invention is schematically shown in FIG. Figure 2 ; Fig.11 The clamp body structure of the present invention is shown in FIG. Figure 3 ; Fig.12 The clamp body structure of the present invention is schematically shown in FIG. Figure 4 ; Fig.13 for Fig.12 A partial enlarged view of point B in the middle; Fig.14 It is a schematic diagram of the structure of the middle layer support seat of the present invention; Fig.15 The limiting column structure of the present invention is shown in FIG. Figure 1 ; Fig.16 The limiting column structure of the present invention is shown in FIG. Figure 2 ; Fig.17 for Fig.16 A partial enlarged view of point C in the middle; Description of the markings in the figure: Clamp body 1; base 101; left support seat 102; right support seat 103; middle support seat 104; screw rod 105; long rod 106; triangular block 107; limit column 108; plug column 109; socket 110; spring one 111; limit hole 112; limit groove 113; block 114; spring two 115; spring support plate 116; pressure indicator 2; quick connector 3; zero point tray 4; accumulator 5; main clamping block 6; auxiliary clamping block 7; auxiliary support block 8; main support block 9; inclined groove one 10; inclined groove two 11; anti-slip protrusion 12; cylinder body 13; plunger 14; piston 15; plunger spring 16. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] Embodiment 1 like Figure 1-Figure 17 As shown, a method for designing a flexible clamping fixture for a blade blank comprises the following steps: A. A main clamping component and four auxiliary clamping components are installed on one side of the clamp body 1, and a main support block 9 and four auxiliary support components are installed on the other side of the clamp body 1. The main clamping component and the main support block 9 are arranged face to face, and the four auxiliary clamping components and the four auxiliary support components are arranged face to face one by one; B. The blade blank is clamped between the main pressing component and the main support block 9, and the four auxiliary support components are freely in contact with the four corners of the blade blank, and the four auxiliary pressing components are flexibly in contact with and pressed at the four corners of the blade blank; C. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator 2 installed on the side of the clamp body 1, and store the pressure energy of the hydraulic oil through the accumulator 5 installed on the side of the clamp body 1; D. The clamp body 1 is quickly installed to a preset position through the quick connector 3 and the zero point tray 4 provided at its lower end.

[0021] The working principle of the above technical solution: the clamp body 1 is quickly installed to the preset position through the quick plug-in connector 3 and the zero-point tray 4 arranged at its lower end, and the installation and disassembly are convenient and quick. The blade blank is suspended at the preset position between the main clamping component and the main support block 9 by the manipulator, and the center position of the blade blank is pressed against the main support block 9 by the main clamping component moving forward. The manipulator releases the grabbing restriction on the blade blank, and the four auxiliary support components move forward. The four auxiliary support components are all in free contact with the four corners of the blade blank. The four auxiliary clamping components move forward and first contact the blade blank flexibly to prevent the plunger from micro-moving when contacting the workpiece, thereby avoiding damage to the workpiece. The four auxiliary clamping components continue to move forward and press at the four corners of the blade blank, thereby completing the clamping and fixing of the blade blank. The pressure indicator 2 installed on the side of the clamp body 1 is used to check the pressure of the hydraulic oil in the oil circuit, and the accumulator 5 installed on the side of the clamp body 1 is used to store the pressure energy of the hydraulic oil to ensure that the oil pressure in the oil circuit inside the clamp meets the use needs for a long time. Through multi-point support and clamping, sufficient clamping force can be guaranteed to ensure that the blade blank will not vibrate or move during milling, grinding, transportation and other links. At the same time, it can adapt to the clamping of blade blanks of different sizes, with a high degree of automation and reduced manual intervention; The auxiliary pressing component performs auxiliary flexible pressing on the blade blank to avoid damage to the blade blank; The structure is simple, which reduces the difficulty of operation and maintenance cost, improves the user experience, and reduces the complexity of the system compared to the modular fixture system; In order to reduce the deformation of the blade blank during clamping, all support points and clamping points should be clamped in a one-to-one corresponding manner to prevent the generation of misalignment torque.

[0022] Embodiment 2 like Figure 1-Figure 17 As shown, in step A, the main pressing component is composed of a high-pressure linear hydraulic cylinder and a main pressing block 6. The high-pressure linear hydraulic cylinder is installed in the clamp body 1, and the output end of the high-pressure linear hydraulic cylinder is connected to the main pressing block 6. The high-pressure linear hydraulic cylinder controls the main pressing block 6 to move forward to squeeze the blade blank onto the main support block 9; The high-pressure linear hydraulic cylinder uses a 45mm diameter linear hydraulic cylinder, which can provide a clamping force of 10.3kN at 15MPa and a clamping force of 17.4kN at 25MPa; The working principle of the above technical solution is: the blade blank is suspended in the receiving groove between the main clamping block 6 and the main support block 9 by a manipulator, and the high-pressure linear hydraulic cylinder is started. The output end of the high-pressure linear hydraulic cylinder drives the main clamping block 6 to move forward. The main clamping block 6 presses the center of the blade blank on the main support block 9 to complete the preliminary fixation of the blade blank. The high-pressure linear hydraulic cylinder uses a linear hydraulic cylinder with a diameter of 45mm. When the clamping force is 15MPa, it can provide a clamping force of 10.3kN, and when it is 25MPa, it can reach a clamping force of 17.4kN, which meets the main clamping force requirements of the blank.

[0023] Embodiment 3 like Figure 1-Figure 17 As shown, in step B, the auxiliary support component includes a hydraulic auxiliary support cylinder, four hydraulic auxiliary support cylinders are respectively installed at the four corners of the clamp body 1, and the output end of the hydraulic auxiliary support cylinder is equipped with an auxiliary support block 8. The four hydraulic auxiliary support cylinders respectively control the four auxiliary support blocks 8 to move forward, and the four auxiliary support blocks 8 are free to contact the four corners of the blade blank; The auxiliary pressing component includes a hydraulic auxiliary pressing cylinder, four hydraulic auxiliary pressing cylinders are respectively installed at the four corners of the clamp body 1, and auxiliary pressing blocks 7 are installed at the output ends of the hydraulic auxiliary pressing cylinders. The four hydraulic auxiliary pressing cylinders respectively control the four auxiliary pressing blocks 7 to move forward, and the four auxiliary pressing blocks 7 flexibly contact and press at the four corners of the blade blank; The working principle of the above technical solution is: after the main clamping block 6 presses the center of the blade blank onto the main support block 9, the manipulator releases the gripping restriction on the blade blank, starts the four hydraulic auxiliary support cylinders, and drives the four auxiliary support blocks 8 to move forward. The four auxiliary support blocks 8 are in free contact with the four corners of the blade blank, and starts the four hydraulic auxiliary clamping cylinders to drive the four auxiliary clamping blocks 7 to move forward. The four pairs of auxiliary clamping blocks at the four corners of the blade blank are clamped to complete the clamping and fixing of the blade blank. Due to multi-point support and clamping, sufficient clamping force can be guaranteed to ensure that the blade blank will not vibrate or move during milling, grinding, transportation and other links.

[0024] Embodiment 4 like Figure 1-Figure 17 As shown, the hydraulic auxiliary pressing cylinder includes a cylinder body 13, a plunger 14 and a piston 15 are slidably connected in the cylinder body 13, a plunger spring 16 is provided between the plunger 14 and the piston 15, and an auxiliary pressing block 7 is fixedly connected to the front end of the plunger 14. After oil is supplied into the cylinder body 13, the piston 15 is driven to rise, and the plunger 14 rises under the action of the plunger spring 16. The spring force of the plunger spring 16 provides the contact force between the auxiliary pressing block 7 and the blade blank, thereby realizing flexible contact; The working principle of the above technical solution is as follows: after oil is supplied into the cylinder body 13, the piston 15 is driven to rise, and the plunger 14 rises under the action of the plunger spring 16. The contact force is provided only by the spring force of the plunger spring 16, thereby achieving flexible contact and preventing the plunger 14 from slightly moving when contacting the blade blank, thereby achieving stable support and avoiding damage to the blade blank.

[0025] Embodiment 5 like Figure 1-Figure 17 As shown, the supporting force of the auxiliary support block 8 on the blade blank is greater than or equal to 1.5 times the pressing force of the auxiliary pressing block 7 on the blade blank; The working principle of the above technical scheme: the supporting force of the auxiliary support block 8 on the blade blank is greater than or equal to 1.5 times the clamping force of the auxiliary clamping block 7 on the blade blank. This scheme uses an auxiliary support hydraulic cylinder with a diameter of 30mm, combined with a linear clamping cylinder with a diameter of 22mm, which can work under a supporting force of 2.6kN and a clamping force of 1.6kN. The middle main clamping cylinder with a diameter of 45mm, combined with the fixed support point on the opposite side, provides a sufficient clamping force of 10.3kN at 15MPa. Each support and clamping can meet the blank error of 6-10mm, providing sufficient flexible clamping conditions for the blank.

[0026] Embodiment 6 like Figure 1-Figure 17 As shown, the clamp body 1 is provided with an inclined groove 10 and an inclined groove 2 11, and the inclined groove 10 and the inclined groove 2 11 are arranged facing each other; The front end of the auxiliary support block 8 is provided with an anti-slip protrusion 12; The working principle of the above technical solution: the chute 1 10 and the chute 2 11 can leave enough space for the manipulator, so that the manipulator will not come into contact with the left support seat 102 or the right support seat 103 during the process of transferring the blade blank, thereby ensuring the stability of the blade blank transfer; The anti-skid protrusion 12 can effectively prevent the blade blank from sliding against the auxiliary support block 8, thereby preventing the blade blank from being clamped stably.

[0027] Embodiment 7 like Figure 1-Figure 17 As shown, in step B, the actual position and direction of the blade blank are measured by a measuring device to obtain its spatial coordinate data, and the five-axis machine tool adjusts the actual processing orientation according to the spatial coordinate data to achieve precise processing of the blade blank; The working principle of the above technical solution: In actual use, there are deviations in the position and direction of the blade blank after clamping. In order to ensure the processing accuracy, the actual position and direction of the blank can be accurately measured with the help of a measuring device. The measuring device can be a three-coordinate measuring machine or an in-machine measuring system. If a three-coordinate measuring machine is used, before processing, a high-precision three-coordinate measuring machine is used to perform a comprehensive scan of the clamped blade blank to obtain its spatial coordinate data, including key feature points of the blade shape, axis inclination angle and other information, to provide accurate data support for subsequent processing path adjustment; Based on the data obtained from the above measurements, the coordinate adjustment function of the five-axis machine tool is used to process the blade blank according to its actual direction. This is the core technical means to achieve perfect processing. This can not only effectively compensate for the problem of insufficient repeated positioning accuracy of the fixture, but also give full play to the advantages of the flexible clamping of the fixture, so that the blade blank can always remain in a stable state during the processing process, avoiding deformation caused by excessive clamping force or uneven distribution, thereby ensuring the processing quality. The specific implementation method is as follows: when the measurement finds that the blade blank has a certain inclination angle in the fixture, the CNC system of the five-axis machine tool is used to perform corresponding rotation and translation adjustments on the processing coordinate system, so that the tool path matches the actual posture of the blank, ensuring that the processed blade blank meets the design requirements.

[0028] Embodiment 8 like Figure 1-Figure 17 As shown, the clamp body 1 includes a base 101, a pressure indicator 2 and an accumulator 5 are installed on the side of the base 101, a quick connector 3 and a zero-point tray 4 are arranged at the lower end of the base 101, a middle-layer support seat 104 is rotatably connected to the upper end of the base 101, a left-side support seat 102 and a right-side support seat 103 are slidably connected to the middle-layer support seat 104, a screw rod 105 is rotatably connected to the middle-layer support seat 104, the left-side support seat 102 and the right-side support seat 103 are both threadedly connected to the screw rod 105, an inclined groove 10 is arranged on the left-side support seat 102, an inclined groove 2 11 is arranged on the right-side support seat 103, a main support block 9 and four hydraulic auxiliary support cylinders are all installed on the right-side support seat 103, and a high-pressure linear hydraulic cylinder and four hydraulic auxiliary pressing cylinders are all installed on the left-side support seat 102; A long rod 106 is slidably connected in the base 101, a triangular block 107 is provided in the middle of the long rod 106, a limiting column 108 is slidably connected in the base 101, a spring 111 is provided between the inside of the base 101 and the bottom of the limiting column 108, the upper end of the limiting column 108 is inserted into the limiting hole 112 provided on the middle support seat 104, the lower end of the triangular block 107 is slidably connected to the limiting column 108, the long rod 106 is fixedly connected to the plug column 109, the plug column 109 is inserted into the socket 110 provided on the side of the limiting column 108, a limiting groove 113 is provided on the side of the base 101, a stopper 114 is slidably connected in the limiting groove 113, the front end of the stopper 114 is against the end of the long rod 106, a spring support plate 116 is fixed on the side of the base 101, and a spring 2 115 is provided between the stopper 114 and the spring support plate 116; The working principle of the above technical solution is: rotating the screw rod 105 drives the left support seat 102 and the right support seat 103 to move together or away from each other, thereby being able to adapt to the clamping of blade blanks of different models; The stopper 114 is pushed down, and the spring 115 is compressed, so that the front end of the stopper 114 is separated from one end of the long rod 106, and the other end of the long rod 106 is pushed. The triangular block 107 moves with the long rod 106, and drives the plug post 109 to disengage from the plug hole 110, and the long rod 106 is pushed forward continuously. The lower end of the triangular block 107 squeezes the limit post 108 to move downward, and the spring 111 is compressed, and the upper end of the limit post 108 is disengaged from the limit hole 112. At this time, the middle support seat 104 can be rotated, and the left support seat 102 and the right support seat 103 can be driven to rotate with the middle support seat 104, thereby changing the angle of the blade blank, and thus changing the processing angle of the blade blank; After the middle support seat 104 rotates to a suitable angle, the pressure restriction on the long rod 106 is released. Under the action of the elastic force of spring 111, the limit column 108 is driven to move upward, and the upper end of the limit column 108 is inserted into the limit hole 112. During the upward movement of the limit column 108, the limit column 108 squeezes the triangular block 107 to move, driving the long rod 106 to move, and at the same time pushes the end of the long rod 106 to drive the plug column 109 to be inserted into the plug hole 110, and the restriction on the stop block 114 is released. Under the action of the elastic force of spring 2 115, the front end of the stop block 114 is driven to press on the end of the long rod 106 to prevent the limit column 108 from accidentally moving down due to vibration during the processing of the blade blank, and the base 101 and the middle support seat 104 automatically rotate, resulting in the failure of the blade blank processing.

[0029] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A method for designing a flexible clamping fixture for blade blanks, characterized in that: The following steps are involved: A. A main clamping component and four auxiliary clamping components are installed on one side of the clamp body (1), and a main support block (9) and four auxiliary support components are installed on the other side of the clamp body (1), the main clamping component and the main support block (9) are arranged face to face, and the four auxiliary clamping components and the four auxiliary support components are arranged face to face one by one; B. The blade blank is clamped between the main clamping component and the main support block (9), the four auxiliary support components are freely in contact with the four corners of the blade blank, and the four auxiliary clamping components are flexibly in contact with and clamped at the four corners of the blade blank; C. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator (2) installed on the side of the clamp body (1), and store the pressure energy of the hydraulic oil through the accumulator (5) installed on the side of the clamp body (1); D. The clamp body (1) is quickly installed at a preset position through a quick connector (3) and a zero point tray (4) provided at its lower end.

2. A blade blank flexible clamping fixture design method according to claim 1, characterized in that: In step A, the main pressing component is composed of a high-pressure linear hydraulic cylinder and a main pressing block (6). The high-pressure linear hydraulic cylinder is installed in the clamp body (1). The output end of the high-pressure linear hydraulic cylinder is connected to the main pressing block (6). The high-pressure linear hydraulic cylinder controls the main pressing block (6) to move forward, thereby squeezing the blade blank onto the main support block (9).

3. The method for designing a flexible clamping fixture for blade blank according to claim 2, characterized in that: The high-pressure linear hydraulic cylinder is a 45mm diameter linear hydraulic cylinder, which can provide a clamping force of 10.3kN at 15MPa and a clamping force of 17.4kN at 25MPa.

4. A blade blank flexible clamping fixture design method according to claim 3, characterized in that: In step B, the auxiliary support component comprises a hydraulic auxiliary support cylinder, wherein four hydraulic auxiliary support cylinders are respectively installed at the four corners of the clamp body (1), and auxiliary support blocks (8) are installed at the output ends of the hydraulic auxiliary support cylinders. The four hydraulic auxiliary support cylinders respectively control the four auxiliary support blocks (8) to move forward, and the four auxiliary support blocks (8) are freely in contact with the four corners of the blade blank.

5. A blade blank flexible clamping fixture design method according to claim 4, characterized in that: The auxiliary clamping component comprises a hydraulic auxiliary clamping cylinder, wherein four hydraulic auxiliary clamping cylinders are respectively installed at the four corners of the clamp body (1), and auxiliary clamping blocks (7) are installed at the output ends of the hydraulic auxiliary clamping cylinders. The four hydraulic auxiliary clamping cylinders respectively control the four auxiliary clamping blocks (7) to move forward, and the four auxiliary clamping blocks (7) flexibly contact and clamp at the four corners of the blade blank.

6. A blade blank flexible clamping fixture design method according to claim 5, characterized in that: The hydraulic auxiliary pressing cylinder comprises a cylinder body (13), a plunger (14) and a piston (15) are slidably connected in the cylinder body (13), a plunger spring (16) is provided between the plunger (14) and the piston (15), and an auxiliary pressing block (7) is fixedly connected to the front end of the plunger (14). After oil is supplied to the cylinder body (13), the piston (15) is driven to rise, and the plunger (14) rises under the action of the plunger spring (16). The spring force of the plunger spring (16) provides a contact force between the auxiliary pressing block (7) and the blade blank, thereby realizing flexible contact.

7. A blade blank flexible clamping fixture design method according to claim 6, characterized in that: The supporting force of the auxiliary support block (8) on the blade blank is greater than or equal to 1.5 times the pressing force of the auxiliary pressing block (7) on the blade blank.

8. A blade blank flexible clamping fixture design method according to claim 7, characterized in that: The clamp body (1) is provided with an inclined groove 1 (10) and an inclined groove 2 (11), wherein the inclined groove 1 (10) and the inclined groove 2 (11) are arranged face to face, and a non-slip protrusion (12) is provided at the front end of the auxiliary support block (8).

9. The method for designing a flexible clamping fixture for blade blank according to claim 1, characterized in that: In step B, the actual position and direction of the blade blank are measured using a measuring device to obtain its spatial coordinate data. The five-axis machine tool adjusts the actual processing orientation according to the spatial coordinate data to achieve precise processing of the blade blank.

10. A blade blank flexible clamping fixture design method according to claim 8, characterized in that: The clamp body (1) comprises a base (101), a pressure indicator (2) and an accumulator (5) are mounted on the side of the base (101), a quick connector (3) and a zero-point tray (4) are mounted on the lower end of the base (101), a middle support seat (104) is rotatably connected to the upper end of the base (101), a left support seat (102) and a right support seat (103) are slidably connected to the middle support seat (104), a screw rod (105) is rotatably connected to the middle support seat (104), the left support seat (102) and the right support seat (103) are both threadedly connected to the screw rod (105), an inclined groove 1 (10) is arranged on the left support seat (102), an inclined groove 2 (11) is arranged on the right support seat (103), a main support block (9) and four hydraulic auxiliary support cylinders are all mounted on the right support seat (103), and a high-pressure linear hydraulic cylinder and four hydraulic auxiliary pressing cylinders are all mounted on the left support seat (102).

Images