A Design Method for a Flexible Clamping Fixture of Blade Blanks

Abstract

The present invention relates to the technical field of aviation blade manufacturing, and particularly to a design method for a flexible clamping fixture for blade blanks, comprising the following steps: A. Install a main pressing component and four auxiliary pressing components on one side inside the fixture body, and install a main support block and four auxiliary support components on the other side inside the fixture body. The main pressing component and the main support block are arranged facing each other, and the four auxiliary pressing components and the four auxiliary support components are arranged facing each other one by one; B. The blade blank is clamped between the main pressing component and the main support block, the four auxiliary support components respectively come into free contact with the four corners of the blade blank, and the four auxiliary pressing components respectively come into flexible contact with and press on 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 fixture body, store the pressure energy of the hydraulic oil through the accumulator installed on the side of the fixture body, and the auxiliary pressing components perform auxiliary flexible pressing on the blade blank to avoid damaging the blade blank.

Description

Technical Field

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

[0002] The currently commonly used blanks in the industry are mainly die-forged and cast blanks. Among them, die-forged blanks have a greater demand for the use of fixtures in machining. With the development and deep integration of advanced manufacturing technologies such as information technology, digital technology, and automation technology, aviation blade manufacturing is developing towards flexibility, automation, precision, and high efficiency. Domestic aviation manufacturing enterprises have built more and more flexible blade processing production lines;

[0003] In the flexible production line, the form of the fixture is mainly the traditional manual fixture for blades. The advantages of the manual fixture are high flexibility, which can be quickly adjusted and customized according to the shape, size, and processing requirements of different workpieces, and is suitable for small-batch and multi-variety production; low cost, with low design and manufacturing costs, and simple maintenance and repair. However, the manual fixture has low efficiency, slow clamping and adjustment speed, which affects the overall efficiency of the production line; limited precision, affected by the skill level and operating habits of workers, it is difficult to ensure that the clamping precision of each workpiece is consistent, which may lead to unstable product quality;

[0004] For mechanical automation fixtures, in the case where the blanks are relatively regular, continuous production can be achieved, manual intervention can be reduced, and the equipment utilization rate can be improved. However, due to die-forging technology reasons for die-forged blade blanks, such as metal temperature, metal deformation process, die wear, etc., the dimensional consistency varies greatly. The design datum of the blade blank is mainly designed on the blade profile surface, and the blade surface is usually a complex curved surface, which makes the design and manufacturing of the clamping device difficult. In order to firmly clamp the blade, the clamping device must match the curved surface shape of the blade, otherwise problems such as unstable clamping and slipping are likely to occur in the subsequent machining process. Summary of the Invention

[0005] The purpose of the present invention is to provide a design method for a flexible clamping fixture for blade blanks to solve the problems in the prior art. The specific technical solutions are as follows:

[0006] A design method for a flexible clamping fixture for blade blanks includes the following steps:

[0007] A. Install a main pressing component and four auxiliary pressing components on one side inside the fixture body, and install a main support block and four auxiliary support components on the other side inside the fixture body. The main pressing component and the main support block are arranged face to face, and the four auxiliary pressing components and the four auxiliary support components are arranged face to face one by one;

[0008] B. The blade blank is clamped between the main pressing component and the main supporting block, and the four auxiliary supporting components are respectively in free contact with the four corners of the blade blank, and the four auxiliary pressing components are respectively in flexible contact with and press on the four corners of the blade blank;

[0009] C. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator installed on the side of the fixture body, and store the pressure energy of the hydraulic oil through the accumulator installed on the side of the fixture body;

[0010] D. The fixture body is quickly installed at the preset position through the quick plug-in connector and the zero-point tray provided at its lower end.

[0011] Furthermore, in step A, the main pressing component consists of a high-pressure linear hydraulic cylinder and a main pressing block. The high-pressure linear hydraulic cylinder is installed inside the fixture body, and the output end of the high-pressure linear hydraulic cylinder is connected to the main pressing block. The high-pressure linear hydraulic cylinder controls the forward movement of the main pressing block to squeeze the blade blank against the main supporting block.

[0012] Furthermore, the high-pressure linear hydraulic cylinder is a linear hydraulic cylinder with a diameter of 45 mm. When its clamping force is at 15 MPa, it can provide a clamping force of 10.3 kN, and when at 25 MPa, it can reach a clamping force of 17.4 kN.

[0013] Furthermore, in step B, the auxiliary supporting component includes a hydraulic auxiliary supporting cylinder. The four hydraulic auxiliary supporting cylinders are respectively installed at the four corners inside the fixture body. An auxiliary supporting block is installed at the output end of the hydraulic auxiliary supporting cylinder. The four hydraulic auxiliary supporting cylinders respectively control the forward movement of the four auxiliary supporting blocks, and the four auxiliary supporting blocks are in free contact with the four corners of the blade blank.

[0014] Furthermore, the auxiliary pressing component includes a hydraulic auxiliary pressing cylinder. The four hydraulic auxiliary pressing cylinders are respectively installed at the four corners inside the fixture body. An auxiliary pressing block is installed at the output end of the hydraulic auxiliary pressing cylinder. The four hydraulic auxiliary pressing cylinders respectively control the forward movement of the four auxiliary pressing blocks, and the four auxiliary pressing blocks are in flexible contact with and press on the four corners of the blade blank.

[0015] Furthermore, the hydraulic auxiliary pressing cylinder includes a cylinder body. A plunger and a piston are slidably connected inside the cylinder body. A plunger spring is arranged between the plunger and the piston. The front end of the plunger is fixedly connected with an auxiliary pressing block. After the cylinder body is supplied with oil, it drives the piston to rise, and the plunger rises under the action of the plunger spring. The spring force of the plunger spring provides the contact force between the auxiliary pressing block and the blade blank to achieve flexible contact.

[0016] 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.

[0017] Further, the fixture body is provided with a first inclined groove and a second inclined groove, the first inclined groove and the second inclined groove are arranged facing each other, and the front end of the auxiliary support block is provided with an anti-slip protrusion.

[0018] Further, in step B, a measuring device is used to measure the actual position and direction of the blade blank, obtain its spatial coordinate data, and the five-axis machine tool adjusts the actual machining orientation according to the spatial coordinate data to achieve precise machining of the blade blank.

[0019] Further, the fixture 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 support seat is rotatably connected to the upper end of the base, a left support seat and a right support seat are slidably connected to the middle support seat, a lead screw is rotatably connected to the middle support seat, the left support seat and the right support seat are both threadedly connected to the lead screw, the first inclined groove is arranged on the left support seat, the second inclined groove is arranged on the right support seat, the main support block and the four hydraulic auxiliary support cylinders are all installed on the right support seat, and the high-pressure linear hydraulic cylinder and the four hydraulic auxiliary pressing cylinders are all installed on the left support seat;

[0020] A long rod is slidably connected in the base, a triangular block is arranged at the middle position of the long rod, a limiting column is slidably connected in the base, a first spring is arranged between the inside of the base and the bottom of the limiting column, the upper end of the limiting column is inserted into a limiting hole arranged 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 inserting column, the inserting column is inserted into a jack arranged on the side of the limiting column, a limiting groove is arranged on the side of the base, a stop block is slidably connected in the limiting groove, the front end of the stop block abuts against the end of the long rod, a spring support plate is fixed on the side of the base, and a second spring is arranged between the stop block and the spring support plate.

[0021] The advantages of the present invention are as follows:

[0022] 1. Through multi-point support and clamping, sufficient clamping force can be ensured to ensure that the blade blank will not vibrate or move in position during milling, grinding, transportation and other processes, and at the same time, it can adapt to the clamping of blade blanks of different sizes, with high automation and reduced manual intervention.

[0023] 2. The auxiliary pressing component performs auxiliary flexible pressing on the blade blank to avoid damaging the blade blank.

[0024] 3. The structure is simple, reducing the operation difficulty and maintenance cost, improving the use experience, and reducing the complexity of the system compared with the modular fixture system.

[0025] 4. To reduce the clamping deformation of the blade blank, all support points and pressing points should be selected in a one-to-one corresponding facing clamping method to prevent the generation of misalignment torque. Description of the Drawings

[0026] Figure 1Flowchart of the fixture design method of the present invention;

[0027] Figure 2 Schematic diagram of the overall structure of the present invention Figure 1 ;

[0028] Figure 3 Schematic diagram of the overall structure of the present invention Figure 2 ;

[0029] Figure 4 Schematic diagram of the overall structure of the present invention Figure 3 ;

[0030] Figure 5 Schematic diagram of the structure of the main pressing component of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the main support block of the present invention;

[0032] Figure 7 For Figure 6 Local enlarged view at position A in

[0033] Figure 8 Schematic diagram of the structure of the auxiliary pressing component of the present invention;

[0034] Figure 9 Schematic diagram of the structure of the fixture body of the present invention Figure 1 ;

[0035] Figure 10 Schematic diagram of the structure of the fixture body of the present invention Figure 2 ;

[0036] Figure 11 Schematic diagram of the structure of the fixture body of the present invention Figure 3 ;

[0037] Figure 12 Schematic diagram of the structure of the fixture body of the present invention Figure 4 ;

[0038] Figure 13 For Figure 12 Local enlarged view at position B in

[0039] Figure 14 Schematic diagram of the structure of the middle layer support seat of the present invention;

[0040] Figure 15 Schematic diagram of the structure of the limit post of the present invention Figure 1 ;

[0041] Figure 16 Schematic diagram of the structure of the limit post of the present invention Figure 2 ;

[0042] Figure 17 For Figure 16Partial enlarged view at position C in the figure;

[0043] Explanation of the markings in the figure:

[0044] Jig body 1; base 101; left support base 102; right support base 103; middle support base 104; lead screw 105; long rod 106; triangular block 107; limit post 108; insertion post 109; insertion hole 110; first spring 111; limit hole 112; limit groove 113; stop block 114; second spring 115; spring support plate 116; pressure indicator 2; quick connector 3; zero tray 4; accumulator 5; main pressing block 6; auxiliary pressing block 7; auxiliary support block 8; main support block 9; first inclined groove 10; second inclined groove 11; anti-slip protrusion 12; cylinder block 13; plunger 14; piston 15; plunger spring 16. Specific implementation mode

[0045] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] Embodiment 1

[0048] As Figures 1 - 17 shown, a design method for a flexible clamping fixture for a blade blank includes the following steps:

[0049] A. Install a main pressing component and four auxiliary pressing components on one side inside the jig body 1, and install a main support block 9 and four auxiliary support components on the other side inside the jig body 1. The main pressing component and the main support block 9 are arranged face to face, and the four auxiliary pressing components and the four auxiliary support components are arranged face to face one by one;

[0050] B. The blade blank is clamped between the main pressing component and the main support block 9. The four auxiliary support components are respectively in free contact with the four corners of the blade blank, and the four auxiliary pressing components are respectively in flexible contact with and press on the four corners of the blade blank;

[0051] C. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator 2 installed on the side of the fixture body 1, and store the pressure energy of the hydraulic oil through the accumulator 5 installed on the side of the fixture body 1;

[0052] D. The fixture body 1 is quickly installed at the preset position through the quick connector 3 and the zero-point pallet 4 provided at its lower end.

[0053] The working principle of the above technical solution: The fixture body 1 is quickly installed at the preset position through the quick connector 3 and the zero-point pallet 4 provided at its lower end, which is convenient and fast for installation and disassembly. The blade blank is suspended by the manipulator at the preset position between the main pressing component and the main support block 9. Through the forward movement of the main pressing component, the center position of the blade blank is tightly pressed on the main support block 9. The manipulator releases the grasping restriction on the blade blank. The four auxiliary support components move forward, and all four auxiliary support components freely contact the four corners of the blade blank. The four auxiliary pressing components move forward, first making flexible contact with the blade blank to prevent the plunger from generating micro-movement when contacting the workpiece and avoid damaging the workpiece. The four auxiliary pressing components continue to move forward and press on the four corners of the blade blank, thereby completing the clamping and fixing of the blade blank. Check the pressure of the hydraulic oil in the oil circuit through the pressure indicator 2 installed on the side of the fixture body 1, and store the pressure energy of the hydraulic oil through the accumulator 5 installed on the side of the fixture body 1 to ensure that the oil pressure inside the fixture can meet the use requirements for a long time;

[0054] Through multi-point support and clamping, sufficient clamping force can be ensured, ensuring that the blade blank will not vibrate or move in position during milling, grinding, transportation and other processes. 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;

[0055] The auxiliary pressing component performs auxiliary flexible pressing on the blade blank to avoid damaging the blade blank;

[0056] The structure is simple, reducing the operation difficulty and maintenance cost, improving the use experience, and reducing the complexity of the system compared with the modular fixture system;

[0057] To reduce the clamping deformation of the blade blank, all support points and pressing points should be selected in a one-to-one corresponding positive clamping method to prevent the generation of misalignment torque.

[0058] Embodiment 2

[0059] As Figures 1 - 17 shown, in step A, the main pressing component consists of a high-pressure linear hydraulic cylinder and a main pressing block 6. The high-pressure linear hydraulic cylinder is installed inside the fixture 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 forward movement of the main pressing block 6 to squeeze the blade blank onto the main support block 9;

[0060] The high-pressure linear hydraulic cylinder selected is a linear hydraulic cylinder with a diameter of 45 mm. When the clamping force is 15 MPa, it can provide a clamping force of 10.3 kN, and when it is 25 MPa, the clamping force can reach 17.4 kN.

[0061] The working principle of the above technical solution: The blank of the blade is suspended by the manipulator at the receiving groove between the main pressing block 6 and the main supporting block 9. The high-pressure linear hydraulic cylinder is started. The output end of the high-pressure linear hydraulic cylinder drives the main pressing block 6 to move forward. The main pressing block 6 presses the center position of the blade blank against the main supporting block 9 to complete the preliminary fixation of the blade blank. The high-pressure linear hydraulic cylinder selected is a linear hydraulic cylinder with a diameter of 45 mm. When the clamping force is 15 MPa, it can provide a clamping force of 10.3 kN, and when it is 25 MPa, the clamping force can reach 17.4 kN, meeting the main clamping force requirement of the blank.

[0062] Embodiment Three

[0063] As Figures 1 - 17 shown, in step B, the auxiliary supporting component includes a hydraulic auxiliary supporting cylinder. Four hydraulic auxiliary supporting cylinders are respectively installed at the four inner corners of the fixture body 1. The output end of the hydraulic auxiliary supporting cylinder is provided with an auxiliary supporting block 8. The four hydraulic auxiliary supporting cylinders respectively control the four auxiliary supporting blocks 8 to move forward, and the four auxiliary supporting blocks 8 freely contact the four corners of the blade blank.

[0064] The auxiliary pressing component includes a hydraulic auxiliary pressing cylinder. Four hydraulic auxiliary pressing cylinders are respectively installed at the four inner corners of the fixture body 1. The output end of the hydraulic auxiliary pressing cylinder is equipped with an auxiliary pressing block 7. The four hydraulic auxiliary pressing cylinders respectively control the four auxiliary pressing blocks 7 to move forward, and the four auxiliary pressing blocks 7 are in flexible contact with and press the four corners of the blade blank.

[0065] The working principle of the above technical solution: After the main pressing block 6 presses the center position of the blade blank against the main supporting block 9, the manipulator releases the grasping restriction on the blade blank. The four hydraulic auxiliary supporting cylinders are started to drive the four auxiliary supporting blocks 8 to move forward. The four auxiliary supporting blocks 8 freely contact the four corners of the blade blank. The four hydraulic auxiliary pressing cylinders are started to drive the four auxiliary pressing blocks 7 to move forward. The four auxiliary pressing blocks 7 assist in pressing the four corners of the blade blank, thereby completing the clamping and fixation of the blade blank. Due to multi-point support and clamping, sufficient clamping force can be ensured to ensure that the blade blank will not vibrate or move in position during milling, grinding, transportation and other processes.

[0066] Embodiment Four

[0067] As Figures 1 - 17As shown in the figure, the hydraulic-assisted pressing cylinder includes a cylinder block 13, in which a plunger 14 and a piston 15 are slidably connected. A plunger spring 16 is provided between the plunger 14 and the piston 15. The front end of the plunger 14 is fixedly connected with an auxiliary pressing block 7. After the cylinder block 13 is supplied with oil, 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, realizing flexible contact.

[0068] The working principle of the above technical solution: After the cylinder block 13 is supplied with oil, the piston 15 is driven to rise, and the plunger 14 rises under the action of the plunger spring 16. Only the spring force of the plunger spring 16 provides the contact force, realizing flexible contact, preventing the plunger 14 from generating micro-movement when contacting the blade blank, thus realizing stable support and avoiding damage to the blade blank.

[0069] Example Five

[0070] As Figures 1 - 17 shown, the supporting force of the auxiliary supporting 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.

[0071] The working principle of the above technical solution: The supporting force of the auxiliary supporting 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. In this solution, an auxiliary supporting hydraulic cylinder with a diameter of 30 mm is selected, which is matched with a linear pressing cylinder with a diameter of 22 mm, and can work under a supporting force of 2.6 kN and a pressing force of 1.6 kN. The main pressing cylinder with a diameter of 45 mm in the middle, together with the fixed supporting points on the opposite side, provides a sufficient clamping force of 10.3 kN at 15 MPa. Each support and pressing can meet the blank error of 6 - 10 mm, providing sufficient flexible clamping conditions for the blank.

[0072] Example Six

[0073] As Figures 1 - 17 shown, the fixture 1 is provided with a first inclined groove 10 and a second inclined groove 11, and the first inclined groove 10 and the second inclined groove 11 are arranged facing each other.

[0074] The front end of the auxiliary supporting block 8 is provided with an anti-slip protrusion 12.

[0075] The working principle of the above technical solution: The first inclined groove 10 and the second inclined groove 11 can leave enough space for the manipulator, so that the manipulator will not contact the left support seat 102 or the right support seat 103 during the process of transferring the blade blank, ensuring the stability of the blade blank transfer.

[0076] The anti-slip protrusion 12 can effectively prevent the blade blank from sliding between the auxiliary supporting block 8, affecting the clamping stability of the blade blank.

[0077] Embodiment Seven

[0078] As Figures 1 - 17 shown, in step B, a measuring device is used to measure the actual position and orientation of the blade blank to obtain its spatial coordinate data. The five-axis machine tool adjusts the actual machining orientation according to the spatial coordinate data to achieve precise machining of the blade blank;

[0079] Working principle of the above technical solution: In actual use, there are deviations in the position and orientation of the blade blank after clamping. To ensure machining accuracy, a measuring device can be used to accurately measure the actual position and orientation of the blank. The measuring device can be a coordinate measuring machine or an in-machine measuring system. If a coordinate measuring machine is selected, before machining, the high-precision coordinate measuring machine is used to comprehensively scan the clamped blade blank to obtain its spatial coordinate data, including information such as the key feature points of the blade profile and the axis inclination angle, providing accurate data support for subsequent machining path adjustment;

[0080] Based on the data obtained from the above measurement, using the coordinate adjustment function of the five-axis machine tool to machine according to the actual orientation of the blade blank is the core technical means to achieve perfect machining. This can not only effectively compensate for the problem of insufficient repeat positioning accuracy of the fixture but also give full play to the flexible clamping advantage of the fixture, keeping the blade blank in a stable state during machining, avoiding deformation caused by excessive or uneven clamping force, and thus ensuring machining quality. The specific implementation method is as follows. When it is measured that the blade blank has a certain inclination angle in the fixture, through the numerical control system of the five-axis machine tool, the machining coordinate system is rotated and translated accordingly to make the tool path match the actual posture of the blank, ensuring that the machined blade blank meets the design requirements.

[0081] Embodiment Eight

[0082] As Figures 1 - 17 shown, the fixture 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 pallet 4 are arranged at 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 lead screw 105 is rotatably connected to the middle support seat 104. Both the left support seat 102 and the right support seat 103 are threadedly connected to the lead screw 105. A first inclined groove 10 is arranged on the left support seat 102, and a second inclined groove 11 is arranged on the right support seat 103. A main support block 9 and four hydraulic auxiliary support cylinders are installed on the right support seat 103. A high-pressure linear hydraulic cylinder and four hydraulic auxiliary pressing cylinders are installed on the left support seat 102;

[0083] A long rod 106 is slidably connected inside the base 101. A triangular block 107 is provided at the middle position of the long rod 106. A limit post 108 is slidably connected inside the base 101. A first spring 111 is provided between the inside of the base 101 and the bottom of the limit post 108. The upper end of the limit post 108 is inserted into a limit hole 112 provided on the middle-layer support base 104. The lower end of the triangular block 107 is slidably connected to the limit post 108. The long rod 106 is fixedly connected to an insertion post 109. The insertion post 109 is inserted into a jack 110 provided on the side of the limit post 108. A limit groove 113 is provided on the side of the base 101. A stop block 114 is slidably connected inside the limit groove 113. The front end of the stop block 114 abuts against the end of the long rod 106. A spring support plate 116 is fixed on the side of the base 101. A second spring 115 is provided between the stop block 114 and the spring support plate 116;

[0084] The working principle of the above technical solution: Rotate the lead screw 105 to drive the left support base 102 and the right support base 103 to move closer or farther away from each other, so as to adapt to the clamping of blade blanks of different models;

[0085] Push down the stop block 114 to drive the second spring 115 to be compressed, so that the front end of the stop block 114 is separated from one end of the long rod 106. Push the other end of the long rod 106. The triangular block 107 moves along with the long rod 106, driving the insertion post 109 to disengage from the jack 110. Continue to push the long rod 106 forward. The lower end of the triangular block 107 presses the limit post 108 to move downward, driving the first spring 111 to be compressed, driving the upper end of the limit post 108 to disengage from the limit hole 112. At this time, the middle-layer support base 104 can be rotated, driving the left support base 102 and the right support base 103 to rotate along with the middle-layer support base 104, thereby changing the angle of the blade blank, and further changing the machining angle of the blade blank;

[0086] When the middle-layer support base 104 rotates to a suitable angle, release the pressing restriction on the long rod 106. Under the action of the elastic force of the first spring 111, drive the limit post 108 to move upward. The upper end of the limit post 108 is inserted into the limit hole 112. During the upward movement of the limit post 108, the limit post 108 presses the triangular block 107 to move, driving the long rod 106 to move. At the same time, push the end of the long rod 106, driving the insertion post 109 to be inserted into the jack 110. Release the restriction on the stop block 114. Under the action of the elastic force of the second spring 115, drive the front end of the stop block 114 to press against the end of the long rod 106, preventing the limit post 108 from accidentally moving downward due to vibration during the machining of the blade blank, and the base 101 and the middle-layer support base 104 from automatically rotating, resulting in the failure of the blade blank machining.

[0087] It will be understood that the present invention is described by way of some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Additionally, under the teaching of the present invention, these features and embodiments can 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 belong to the scope protected by the present invention.

Claims

1. A design method for a flexible clamping fixture for blade blanks, characterized in that, It includes the following steps: A. Install a main pressing component and four auxiliary pressing components on one side inside the fixture body (1), and install a main support block (9) and four auxiliary support components on the other side inside the fixture body (1). The main pressing component and the main support block (9) are arranged face to face, and the four auxiliary pressing 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), the four auxiliary support components are respectively in free contact with the four corners of the blade blank, and the four auxiliary pressing components are respectively in flexible contact with and press on 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 fixture body (1), and store the pressure energy of the hydraulic oil through the accumulator (5) installed on the side of the fixture body (1); D. The fixture body (1) is quickly installed at a preset position through the quick connector (3) and the zero-point pallet (4) arranged at its lower end; The fixture body (1) includes a base (101), a middle-layer 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-layer support seat (104), a lead screw (105) is rotatably connected to the middle-layer support seat (104), and both the left support seat (102) and the right support seat (103) are threadedly connected to the lead screw (105); A long rod (106) is slidably connected inside the base (101), a triangular block (107) is arranged at the middle position of the long rod (106), a limit post (108) is slidably connected inside the base (101), a first spring (111) is arranged between the inside of the base (101) and the bottom of the limit post (108), the upper end of the limit post (108) is inserted into a limit hole (112) arranged on the middle-layer support seat (104), the lower end of the triangular block (107) is slidably connected to the limit post (108), the long rod (106) is fixedly connected to an insertion post (109), the insertion post (109) is inserted into a jack (110) arranged on the side of the limit post (108), a limit groove (113) is arranged on the side of the base (101), a stop block (114) is slidably connected inside the limit groove (113), the front end of the stop block (114) abuts against the end of the long rod (106), a spring support plate (116) is fixed on the side of the base (101), and a second spring (115) is arranged between the stop block (114) and the spring support plate (116).

2. The design method of a flexible clamping fixture for a blade blank according to claim 1, wherein, 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 inside the fixture body (1), the output end of the high-pressure linear hydraulic cylinder is connected to the main pressing block (6), and the high-pressure linear hydraulic cylinder controls the forward movement of the main pressing block (6) to squeeze the blade blank onto the main support block (9).

3. A design method for a flexible clamping fixture for a blade blank according to claim 2, characterized in that, The high-pressure linear hydraulic cylinder selects a linear hydraulic cylinder with a diameter of 45 mm. When its clamping force is at 15 MPa, it can provide a clamping force of 10.3 kN, and when it is at 25 MPa, it can reach a clamping force of 17.4 kN.

4. A design method for a flexible clamping fixture for a blade blank according to claim 3, characterized in that, In step B, the auxiliary support component includes a hydraulic auxiliary support cylinder. Four hydraulic auxiliary support cylinders are respectively installed at the four inner corners of the fixture body (1). An auxiliary support block (8) is installed at the output end of the hydraulic auxiliary support cylinder. The four hydraulic auxiliary support cylinders respectively control the four auxiliary support blocks (8) to move forward, and the four auxiliary support blocks (8) freely contact the four corners of the blade blank.

5. A design method of a flexible clamping fixture for a blade blank according to claim 4, characterized in that, The auxiliary pressing component includes a hydraulic auxiliary pressing cylinder. Four hydraulic auxiliary pressing cylinders are respectively installed at the four inner corners of the fixture body (1). An auxiliary pressing block (7) is installed at the output end of the hydraulic auxiliary pressing cylinder. 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 on the four corners of the blade blank.

6. A design method for a flexible clamping fixture for blade blanks, as claimed in claim 5, wherein, 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 arranged between the plunger (14) and the piston (15). The front end of the plunger (14) is fixedly connected with an auxiliary pressing block (7). After the cylinder body (13) is supplied with oil, it drives the piston (15) to lift up. 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 to achieve flexible contact.

7. A method for designing a flexible clamping fixture for a blade blank 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 method for designing a flexible clamping fixture for a blade blank, according to claim 7, characterized in that The fixture body (1) is provided with a first inclined groove (10) and a second inclined groove (11). The first inclined groove (10) and the second inclined groove (11) are arranged face to face. The front end of the auxiliary support block (8) is provided with an anti-slip protrusion (12).

9. A design method for a flexible clamping fixture for a blade blank according to claim 1, characterized in that, 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 machining orientation according to the spatial coordinate data to achieve precise machining of the blade blank.

10. A design method for a flexible clamping fixture for a blade blank according to claim 8, characterized in that, 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 pallet (4) are arranged at the lower end of the base (101). Both the left support seat (102) and the right support seat (103) are threadedly connected with the lead screw (105). The first inclined groove (10) is arranged on the left support seat (102), and the second inclined groove (11) is arranged on the right support seat (103). The main support block (9) and the four hydraulic auxiliary support cylinders are all installed on the right support seat (103), and the high-pressure linear hydraulic cylinder and the four hydraulic auxiliary pressing cylinders are all installed on the left support seat (102).

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