Blade blank clamping method

Abstract

The invention discloses a blade blank clamping method and relates to the field of blade clamping, a casting mold is used for clamping a blade, the casting mold comprises a barrel, the barrel is provided with a casting cavity, the casting cavity penetrates through the two side faces of the barrel, the two side faces of the barrel are detachably connected with molded surface sample plates, and the molded surface sample plates seal the casting cavity. A penetrating hole matched with the section of the molded surface is formed in the molded surface sample plate; a pouring hole and an exhaust hole are formed in the cylinder body; comprising the following steps that S1, a blade blank is supported and suspended through a tool, and the blade blank penetrates through a pouring mold in the process that the blade blank is supported and suspended; s2, a gap between the blade blank and the hole wall of the penetrating hole is blocked through blocking mud; s3, pouring a pouring liquid into the pouring cavity from the pouring hole until the pouring cavity is filled with the pouring liquid; and S4, the pouring liquid is completely cooled, and clamping of the blade blank is completed. A qualified standard can be manufactured for blade blank processing, so that subsequent processing is facilitated, and the defects of non-uniform allowance and the like are prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of blade clamping, in particular to a blade blank clamping method. BACKGROUND

[0002] In the field of high-end equipment manufacturing such as aerospace and energy power, the machining precision of large-scale die forging blades as core power components directly affects the operation efficiency, reliability and service life of the whole machine. Due to the complex structure of the blade, it often presents irregular curved surface modeling, and the blank is prone to surface distortion during forging due to uneven stress distribution, die wear and other factors, resulting in a lack of unified and accurate machining reference for the blank, which brings great challenges to subsequent precision machining processes such as milling and grinding.

[0003] Specifically, since the blade blank has the initial shape of the blade and presents irregular curved surface modeling, in the traditional machining mode, if the blank has no reliable reference, the machining boundary needs to be determined by multiple trial cuts, manual line marking and other methods, which not only is cumbersome and time-consuming, but also is prone to uneven distribution of blade surface allowance due to human error; that is, the allowance of some areas is too large, increasing the processing time and tool wear; the allowance of some areas is insufficient, and even there is a risk of "overcutting", which directly causes the blank to be scrapped.

[0004] To solve the above problems, the industry has tried to use alternative solutions such as direct positioning of tooling fixtures and laser scanning modeling, but all have obvious limitations: First, tooling fixture positioning relies on local features of the blade (such as blade root and blade tip), and if the blank features have deviations, the positioning accuracy is difficult to guarantee, and the special fixture has poor adaptability, needs to be designed separately for different types of blades, and has insufficient universality; Second, although laser scanning modeling can obtain surface data, it needs to be equipped with high-precision scanning equipment and data processing systems, which is costly, and after modeling, the machining reference still needs to be generated through complex algorithms, which is cumbersome and not suitable for batch production scenarios.

[0005] Therefore, a new blade blank clamping method is needed. SUMMARY

[0006] The purpose of the present application is to provide a blade blank clamping method to provide a qualified reference for blade blank machining and manufacturing to prevent uneven allowance defects.

[0007] The technical scheme adopted by the present application is as follows: a blade blank clamping method utilizes a pouring mold to clamp a blade, wherein the pouring mold comprises a cylinder body, the cylinder body has a pouring cavity, the pouring cavity penetrates through two sides of the cylinder body, the two sides of the cylinder body are detachably connected with a profile template, the profile template closes the pouring cavity, and the profile template is provided with a through hole matched with a profile section; the cylinder body is provided with a pouring hole and an exhaust hole; the method comprises the following steps: S1: suspending the blade blank by using a tool, and penetrating through the pouring mold in the process of suspending the blade blank; S2: blocking the gap between the blade blank and the wall of the through hole by using blocking mud; S3: pouring pouring liquid into the pouring cavity from the pouring hole until the pouring cavity is filled with the pouring liquid; S4: completely cooling the pouring liquid to complete the clamping of the blade blank.

[0008] Further, the profile template comprises an upper panel and a lower panel, the opposite sides of the upper panel and the lower panel are provided with profile edges matched with the profile of the blade blank, and the profile edges on the upper panel and the lower panel form the through hole after the upper panel and the lower panel are spliced.

[0009] Further, after the blade is supported, the relative position of the blade and the pouring mold in the vertical direction satisfies the following condition: After the pouring is completed, the horizontal plane where the center line of the center hole on the blade blank is located is a first boundary surface, the first total mass on both sides of the first boundary surface is equal, and the first total mass is the sum of the mass of the blade blank and the mass of the solidified pouring liquid on any one side of the first boundary surface.

[0010] Further, after the blade is supported, the relative position of the blade and the pouring mold in the vertical direction satisfies the following condition: After the pouring is completed, the horizontal plane where the center line of the center hole on the blade blank is located is a second boundary surface, the second total mass on both sides of the second boundary surface is equal, and the second total mass is the sum of the mass of the blade blank and the mass of the solidified pouring liquid on any one side of the second boundary surface.

[0011] Further, after the blade is supported, the relative position of the blade and the pouring mold in the vertical direction satisfies the following condition: After the pouring is completed, the material of the blade blank and the solidified pouring liquid forms an integral whole, and the center of gravity of the integral whole is located inside the solidified pouring liquid.

[0012] Further, in step S1, the tool can adopt a three-point clamp, the three-point clamp comprises a bottom plate, the bottom plate is provided with a top tail seat and a top pin seat, the top pin seat is movably connected with a top pin through threads, the top tail seat is movably connected with at least two top tail pins through threads, the axial directions of the top tail pins and the top pin are parallel to the bottom plate, and the top tail pins and the top pin are arranged towards each other; the moving directions of the top tail pins and the top pin are along the axial directions thereof.

[0013] Further, the top tip seat and the top tail seat are collectively referred to as a seat body, the top tip needle and the top tail needle are collectively referred to as a top needle, a through hole is formed at a position where the seat body and the top needle are connected, a back plate is fixed on the seat body, the top needle is threadedly connected with the back plate and the needle tip end of the top needle penetrates through the through hole; a bushing is arranged between the inner wall of the through hole and the top needle, and the bushing is fixedly connected with the through hole and slidably connected with the top needle; a limiting plate is arranged on the top needle, the limiting plate is located between the back plate and the bushing, a spring is arranged between the limiting plate and the bushing or between the limiting plate and the back plate, and the spring is sleeved on the top needle.

[0014] Further, the pouring liquid is a low-melting-point alloy.

[0015] Further, when the pouring liquid is poured, the flow rate of the pouring liquid is controlled to be 2.5 L / min-2.8 L / min.

[0016] Further, when the cooling is sufficient, the surface of the pouring mold is flushed with normal-temperature water for at least 90 min.

[0017] In summary, due to the adoption of the above technical solutions, the present application has the following beneficial effects: 1. The present application pours a block on the blade blank, the block and the blade blank form an integral whole, the block can be clamped to process the blade during blade processing, the vibration during processing can be effectively inhibited, the clamping difficulty can be reduced, and the dimensional accuracy of blade processing can be ensured. 2. The present application pours a block on the blade blank, the surface of the block is used as a size reference, a qualified reference is manufactured for the blade blank to facilitate subsequent processing, and the defect of uneven allowance is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be described by way of example and with reference to the accompanying drawings, in which: Figure 1 It is a three-dimensional schematic view of the blade blank and the pouring mold after assembly; Figure 2 It is a front view schematic view of the blade blank and the pouring mold after assembly; Figure 3 It is a top view schematic view of the blade blank and the pouring mold after assembly; Figure 4 It is a top view structural schematic view of the three-top-needle clamp; Figure 5 It is a front view structural schematic view of the three-top-needle clamp; Marked in the figure: 1 - base plate; 2 - tailstock; 21 - tailstock needle; 3 - top tailstock; 31 - top tailstock needle; 4 - bushing; 5 - rotating handle; 6 - through hole; 7 - limiting plate; 8 - keyway; 9 - spring; 10 - back plate; 11 - threaded hole; 12 - blade blank; 121 - center hole; 122 - positioning hole; 13 - pouring mold; 131 - upper panel; 132 - lower panel; 133 - pouring hole; 134 - exhaust hole; 135 - cylinder. DETAILED DESCRIPTION

[0019] In the description of the present specification, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the specification is used, and are only for the convenience of describing the specification and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the specification.

[0020] In addition, in the description of the present specification, the terms "horizontal", "vertical" and the like do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0021] In the description of the present specification, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, the connection can be a fixed connection, or a detachable connection, or an integral connection; can be a mechanical connection, or an electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements.

[0022] As shown in Figures 1-5 A blade blank clamping method is used to clamp the blank of a moving blade. Specifically, taking the material grade of the moving blade as 14Cr12Ni3Mo2VN as an example, the shape of the blade blank 12 is as shown in Figures 1-3As shown, it has a complex curved surface profile; when the blade blank 12 is obtained from the blank manufacturer, the blade blank 12 has a central hole 121 at the blade tip, and two positioning holes 122 at the blade root. The main technology of the scheme is to use the square block clamping blade blank 12 poured by the pouring mold 13, the pouring mold 13 includes a cylinder 135, the cylinder 135 has a pouring cavity, the pouring cavity has six faces, which is equivalent to the structure of a rectangular body; the pouring cavity penetrates through two sides of the cylinder 135, and the two sides of the cylinder 135 are detachably connected with a profile template, the profile template closes the pouring cavity, and the profile template has a through hole matched with the profile cross section; the cylinder 135 is provided with a pouring hole 133 and an exhaust hole 134; the specific steps are as follows.

[0023] S1: using a tool to support the blade blank 12 in the air, and passing through the pouring mold 13 in the process of supporting the blade blank 12 in the air.

[0024] S2: using the plugging mud to plug the gap between the blade blank 12 and the wall of the through hole.

[0025] S3: pouring pouring liquid into the pouring cavity from the pouring hole 133 until the pouring cavity is filled with pouring liquid.

[0026] S4: completely cooling the pouring liquid to complete the clamping of the blade blank 12.

[0027] The above steps are only a scheme framework of the whole, and the steps are further described in detail below.

[0028] In step S1, the tool adopts a three-top-pin clamp, which includes a bottom plate 1, the bottom plate 1 is provided with a top tail seat 3 and a top pin seat 2, the top pin seat 2 is threadedly movably connected with a top pin 21, and the top tail seat 3 is threadedly movably connected with at least two top tail pins 31, the axial directions of the top tail pins 31 and the top pin 21 are parallel to the bottom plate 1, and the top tail pins 31 and the top pin 21 are arranged opposite to each other; the moving direction of the top tail pins 31 and the top pin 21 is along the axial direction of itself; when the three-top-pin clamp is used to clamp the blank, the blank needs to be placed between the top tail seat 3 and the top pin seat 2, the blank is lifted or lifted, and the blank is moved so that the blade root of the blade blank 12 is in contact with the top tail pins 31, that is, the top tail pins 31 are aligned with the positions of the two positioning holes 122 at the blade root; in the process, the degree or position of the threaded connection between the top tail seat 3 and the top tail pins 31 can be adjusted to ensure that all the top tail pins 31 are in contact with one end of the blank; then the top pin 21 is rotated, the degree or position of the threaded connection between the top pin 21 and the top pin seat 2 is adjusted, so that the top pin 21 is tightly clamped at the other end of the blade blank 12, that is, the top pin 21 is tightly clamped at the central hole 121 at the blade tip; the clamping of the blank is realized through the cooperation of the top tail pins 31 and the top pin 21, and the purpose of supporting and suspending and stable clamping is achieved.

[0029] In this step S1, the embryo is lifted and suspended by the cooperation of the top needle 21 and the top tail needle 31, and after the embryo is suspended, the axial direction of the embryo is also in a parallel state with the bottom plate 1. When the clamping blade embryo 12 is poured by using the pouring mold 13, the cylinder 135 can be placed on the bottom plate 1, that is, the axial direction of the embryo is basically parallel to the axis of the cylinder 135.

[0030] In step S1, before the blade embryo 12 is supported and suspended by using the tool, the blade embryo 12 needs to pass through the cylinder 135 in the pouring mold 13; after passing through, the cylinder 135 is placed on the bottom plate 1.

[0031] In step S1, since the blade embryo 12 is a complex curved surface, it is difficult to operate directly through the through hole, therefore, the profile template can be designed by splicing the upper panel 131 and the lower panel 132; specifically, the side of the upper panel 131 and the lower panel 132 facing each other has a contour edge matching the profile of the blade embryo 12, after splicing the upper panel 131 and the lower panel 132, the contour edges on the upper panel 131 and the lower panel 132 form a through hole; when installing, the blade is clamped by the three-top-needle clamp and is fixed, when installing the profile template, only need to abut the contour edge of the upper panel 131 to the upper side of the profile of the blade embryo 12, and abut the contour edge of the lower panel 132 to the lower side of the profile of the blade embryo 12, at the same time, the end faces of the upper panel 131 and the lower panel 132 are respectively attached to the end faces of the cylinder 135, and are locked by locking members such as screws or clamping hoops; thus, the blade embryo 12 passes through the entire pouring mold 13.

[0032] It should be noted that before assembling the upper panel 131 and the lower panel 132, the position of the cylinder 135 relative to the blade embryo 12 needs to be adjusted; the specific adjustment conditions are as follows, including conditions one, two and three: Condition one, after the blade is supported, the relative position of the blade and the pouring mold 13 in the vertical direction satisfies the following condition: After pouring is completed, the horizontal plane where the center line of the center hole 121 of the blade embryo 12 is located is the first boundary surface, the first total mass on both sides of the first boundary surface is equal, and the first total mass is the sum of the mass of the blade embryo 12 on either side of the first boundary surface and the mass of the poured liquid after solidification.

[0033] Condition two, after the blade is supported, the relative position of the blade and the pouring mold 13 in the longitudinal direction satisfies the following condition: After pouring is completed, the horizontal plane where the center line of the center hole 121 of the blade embryo 12 is located is the second boundary surface, the second total mass on both sides of the second boundary surface is equal, and the second total mass is the sum of the mass of the blade embryo 12 on either side of the second boundary surface and the mass of the poured liquid after solidification.

[0034] Condition three, after the blade is supported, the relative position of the blade and the pouring mold 13 in the transverse direction satisfies the following conditions: After pouring is completed, the blade blank 12 and the material after the pouring liquid solidifies form an integral whole, and the center of gravity of the integral whole is located inside the material after the pouring liquid solidifies.

[0035] Although the blade blank 12 is clamped by the pouring block, the block is in surface contact with the blade blank 12, has a large area of contact position, can effectively ensure the stability of the clamped blade and reduce the vibration of the blade during processing, but due to the axial direction of the blade, the end far away from the block (the blade top position) will still have a vibration during processing. Therefore, by restricting the above three conditions, the stability of the blade blank 12 clamped by the pouring block after the blade is poured can be further improved, and the vibration of the blade blank 12 during processing of the blade blank 12 can also be effectively reduced, further ensuring the dimensional accuracy.

[0036] By the above three conditions, the relative position of the cylinder 135 and the blade blank 12 can be determined. For example, under the size of the cylinder 135 vertical 350mm*longitudinal 570mm*transverse 270mm, the axial length of the blade blank is 1143.11mm. When the position of the cylinder 135 is adjusted to satisfy the above three conditions, the transverse side of the cylinder 135 is 188.31mm away from the end of the blade root, the center hole 121 axis is 285±0.5mm away from the longitudinal side of the cylinder 135; the center hole 121 axis is 158±0.5mm away from the bottom surface of the cylinder 135 in the vertical direction. Of course, the size is determined on the premise that the pouring liquid is a low melting alloy, and the low melting point alloy can be a tin-bismuth alloy.

[0037] It should be noted that the above three conditions can be converted into the relationship between the cylinder 135 and the three-point clamp, that is, the position of the cylinder 135 on the base plate 1 is determined to determine the distance between the center hole 121 axis and the longitudinal side of the cylinder 135 and the distance between the blade root and the transverse side of the cylinder 135. The vertical distance of the three-point needle relative to the base plate 1 determines the distance between the center hole 121 axis and the bottom surface of the cylinder 135 in the vertical direction.

[0038] After the profile template is assembled, step S2 can be performed; in step S2, the sealing mud is yellow mud, which has good adhesion and does not crack when heated, ensuring complete sealing of the gap and stability of the sealing, achieving the purpose of restricting the pouring liquid in the pouring cavity.

[0039] After the gap is sealed in step S2, it can be poured. The material for pouring is a tin-bismuth alloy with a low melting point, which can be melted at a temperature not exceeding 80℃. Therefore, the selection of this low melting point alloy can achieve the purpose of convenient melting and avoiding scalding of the pouring workers. The melting of the low melting point alloy can be carried out by water bath.

[0040] In step S3, the flow rate of the casting liquid needs to be controlled at 2.5L / min-2.8L / min when the casting liquid is cast, on the one hand to ensure the injection speed of the casting liquid and avoid the injected casting liquid from cooling too early to form a solid, thereby causing an interface in the cast block to affect the overall strength; on the other hand, to avoid too fast so that the gas can be effectively discharged during casting, avoiding the concentration of heat and the gas in the barrel 135 and the phenomenon of physical explosion and air holes in the cast block.

[0041] In step S4, the surface of the casting mold 13 is flushed with normal temperature water for at least 90 min when cooled sufficiently.

[0042] In summary, by the above method, the low-melting-point alloy block is cast on the blade blank 12, the block and the blade blank 12 form an integral whole, and when the blade is processed, the block can be clamped to process the blade, which can effectively suppress the vibration during processing and reduce the clamping difficulty, ensure the dimensional accuracy of the blade processing, and the block surface can be used as a size reference during processing to realize the manufacture of a qualified reference for the blade blank 12 for subsequent processing, preventing uneven defects.

[0043] Example 2 In this embodiment, the three-point clamp is further supplemented.

[0044] A feasible implementation, the connection between the top tail seat 3 and the top tail needle 31, the connection between the top pin seat 2 and the top pin needle 21 is basically the same; for the convenience of unified description, the top pin seat 2 and the top tail seat 3 are collectively referred to as the seat body, and the top pin 21 and the top tail needle 31 are collectively referred to as the top needle. The seat body and the top needle are connected at a position where a through hole 6 is provided, the seat body is fixed with a back plate 10, and the top needle is threadedly connected with the back plate 10 and the needle tip of the top needle penetrates through the through hole 6. Through this structure, the threaded connection between the top needle and the seat body can be achieved.

[0045] A feasible implementation, the inner wall of the through hole 6 and the top needle are provided with a bushing 4, and the bushing 4 is fixedly connected with the through hole 6, and the bushing 4 is slidably connected with the top needle. The gap between the top needle and the inner wall of the through hole 6 is compensated by the bushing 4 to avoid the top needle from shaking and ensure the stability of the clamping of the blank.

[0046] A feasible implementation, a limiting plate 7 is provided on the top needle, the limiting plate 7 is located between the back plate 10 and the bushing 4, a spring 9 is provided between the limiting plate 7 and the bushing 4 or between the limiting plate 7 and the back plate 10, the spring 9 is sleeved on the top needle, and the spring 9 always has elastic force which can exert elastic force on the top needle to increase the pre-tightening force of the threaded connection between the top needle and the back plate 10 and avoid the top needle from loosening when clamping the blank.

[0047] In an embodiment, the top tail needle 31 and the top needle 21 are provided with a rotating handle 5, which facilitates the rotation of the top tail needle 31 and the top needle 21.

[0048] In an embodiment, the top tail needle 31 and all the top needles 21 are in the same plane, so that the pressing force on the blank is in the same plane, avoiding the generation of torque and improving the stability of the pressing and clamping; in fact, it is difficult to be in the same plane, so the error in the height direction is less than 0.1 mm, which can avoid the generation of excessive vertical torque.

[0049] In an embodiment, the top tail needle 31 is two, and the projection of the top needle 21 is at the midpoint of the connecting line of the two top tail needles 31; so that the distribution of the pressing force provided by the top tail needle 31 is on both sides of the pressing force provided by the top needle 21, avoiding the generation of rotational torque and improving the stability of the pressing and clamping; similarly, in fact, it is difficult to make the projection of the top needle 21 at the midpoint of the connecting line of the two top tail needles 31, so the error of the left and right deviation is less than 0.1 mm.

[0050] It should be noted that the "top tail needle 31 and all the top needles 21 are in the same plane" and the "projection of the top needle 21 is at the midpoint of the connecting line of the two top tail needles 31" cooperate with each other to solve the stability problem of the blank pressing and clamping.

[0051] In an embodiment, the top needle seat 2 is detachably connected with the bottom plate 1 through screws, so as to facilitate assembly and reduce space occupation when not in use.

[0052] In an embodiment, a plurality of threaded holes 11 are formed in the bottom plate 1, the plurality of threaded holes 11 are arranged along the axial direction of the top needle 21, the top needle seat 2 is connected with the bottom plate 1 through screws and different threaded holes 11, the position of the connection between the top needle seat 2 and the bottom plate 1 is changed, and further the clamping of the blade blank 12 of different sizes is realized.

[0053] In an embodiment, the top tail seat 3 is detachably connected with the bottom plate 1 through screws, so as to facilitate assembly and reduce space occupation when not in use.

[0054] In an embodiment, a key groove 8 and a plurality of threaded holes 11 are formed in the bottom plate 1, the length direction of the key groove 8 is along the axial direction of the top tail needle 31, the bottom of the top tail seat 3 is provided with a flat key matched with the key groove 8, the plurality of threaded holes 11 are arranged along the axial direction of the top needle 21, and the screw can be threadedly connected with the threaded hole 11 after passing through the top tail seat 3; the flat key can constrain the top tail seat 3 from shaking in the direction perpendicular to the overall axis, improving the position stability; at the same time, the connection position of the top tail seat 3 and the bottom plate 1 is changed, and further the clamping of the blade blank 12 of different sizes is realized.

[0055] The application is not restricted to the foregoing specific embodiments. The application extends to any novel one, or any novel combination, of the features disclosed in this specification, and to any novel method or process disclosed in this specification or any novel combination thereof.

Claims

1. A method for clamping blade blanks, characterized in that: The blade is held in place by a casting mold (13), wherein the casting mold (13) includes a cylinder (135), the cylinder (135) has a casting cavity that extends through both sides of the cylinder (135), and a profile template is detachably connected to both sides of the cylinder (135). The profile template closes the casting cavity and has through holes that match the profile cross-section. The cylinder (135) is provided with a casting hole (133) and a vent hole (134). The process includes the following steps: S1: Use tools to support and suspend the blade blank (12), and pass through the casting mold (13) while the blade blank (12) is supported and suspended. S2: Use sealing mud to seal the gap between the blade blank (12) and the through hole wall; S3: Pour the casting liquid into the casting cavity from the casting hole (133) until the casting cavity is filled with the casting liquid; S4: Completely cool the casting liquid to complete the clamping of the blade blank (12).

2. The blade blank clamping method according to claim 1, characterized in that: The profile template includes an upper panel (131) and a lower panel (132). The upper panel (131) and the lower panel (132) have contour edges that match the profile of the blade blank (12) on opposite sides. After the upper panel (131) and the lower panel (132) are spliced ​​together, the contour edges on the upper panel (131) and the lower panel (132) form through holes.

3. The blade blank clamping method according to claim 1, characterized in that: After the blade is supported, the vertical relative position of the blade and the casting mold (13) satisfies the following conditions: After casting, the horizontal plane where the center line of the central hole (121) on the blade blank (12) is located is the first interface. The first total mass on both sides of the first interface is equal. The first total mass is the sum of the mass of the blade blank (12) on either side of the first interface and the mass of the casting liquid after solidification.

4. The blade blank clamping method according to claim 1, characterized in that: After the blade is supported, the relative position of the blade and the casting mold (13) in the longitudinal direction satisfies the following conditions: After casting, the horizontal plane where the center line of the central hole (121) on the blade blank (12) is located is the second interface. The second total mass on both sides of the second interface is equal. The second total mass is the sum of the mass of the blade blank (12) on either side of the second interface and the mass of the casting liquid after solidification.

5. The blade blank clamping method according to claim 1, characterized in that: After the blade is supported, the relative position of the blade and the casting mold (13) in the lateral direction satisfies the following conditions: After casting, the blade blank (12) and the solidified material of the casting liquid form a whole, and the center of gravity of the whole is located inside the solidified material of the casting liquid.

6. The blade blank clamping method according to claim 1, characterized in that: In step S1, the tool adopts a three-pin clamp, which includes a base plate (1), a top tail seat (3) and a top center seat (2) are provided on the base plate (1), a top center needle (21) is movably connected to the top center seat (2) by a thread, and at least two top tail needles (31) are movably connected to the top tail seat (3) by a thread. The axial direction of the top tail needle (31) and the top center needle (21) is parallel to the base plate (1), and the top tail needle (31) and the top center needle (21) are arranged facing each other. The movement direction of the top tail needle (31) and the top center needle (21) is along their own axial direction.

7. The blade blank clamping method according to claim 6, characterized in that: The top seat (2) and the top tail seat (3) are collectively referred to as the seat body, and the top pin (21) and the top tail pin (31) are collectively referred to as the pin. A through hole (6) is provided at the position where the seat body and the pin are connected. A back plate (10) is fixed on the seat body. The pin is threadedly connected to the back plate (10) and the tip of the pin passes through the through hole (6). A bushing (4) is provided between the inner wall of the through hole (6) and the pin. The bushing (4) is fixedly connected to the through hole (6) and slidably connected to the pin. A limiting plate (7) is provided on the pin. The limiting plate (7) is located between the back plate (10) and the bushing (4). A spring (9) is provided between the limiting plate (7) and the bushing (4) or between the limiting plate (7) and the back plate (10). The spring (9) is sleeved on the pin.

8. The blade blank clamping method according to claim 1, characterized in that: The casting liquid is a low-melting-point alloy.

9. The blade blank clamping method according to claim 1, characterized in that: When pouring the casting fluid, the flow rate of the casting fluid should be controlled at 2.5L / min-2.8L / min.

10. The blade blank clamping method according to claim 1, characterized in that: When fully cooled, rinse the surface of the casting mold (13) with room temperature water for at least 90 minutes.

Images