Blade machining fixture

Abstract

The application discloses a blade machining clamp, comprising a tenon clamping device, a blade crown positioning device and a blade body pressing device; the tenon clamping device is used for clamping the tenon of the blade; the blade crown positioning device comprises a first positioning mechanism and a second positioning mechanism, the first positioning mechanism is used for abutting and positioning the bottom surface of the blade crown of the blade, and the second positioning mechanism is used for abutting and positioning the side surface of the blade crown; the blade body pressing device comprises a steel belt and a tensioning mechanism, the first end of the steel belt is arranged below the side of the blade body away from the second positioning mechanism, the second end of the steel belt is arranged from above the blade body to the side of the blade body towards the second positioning mechanism, and the tensioning mechanism is connected with the second end of the steel belt and is used for tensioning the steel belt in the direction of the included angle towards the first positioning mechanism and the second positioning mechanism. The blade machining clamp provided by the application is simple and efficient, can simplify the clamping process, improve the clamping efficiency and clamping precision, and will not interfere with the machining of the blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blade machining of an aero-engine, in particular to a blade machining clamp. BACKGROUND

[0002] At present, for the machining of the blade crown of the aero-engine blade, a special clamp needs to be designed according to the irregular geometric characteristics of the blade profile to clamp and position the blade, for example, a plurality of positioning points on the blade are positioned and fixed according to the six-point positioning principle. Not only is the number of positioning points too large, which leads to a complex clamp structure, a cumbersome clamping process, a long time consumption and a low efficiency, but also the plurality of positions on the blade will be subjected to mechanical clamping force, which is easy to cause clamping damage to the weak parts of the blade. Moreover, due to the complex machining process flow of the aero-engine blade, the traditional clamp is easy to interfere with the machining feed, and multiple conversion of the clamping reference is required, which leads to unstable blade machining quality, low machining efficiency and difficulty in meeting the high-precision machining requirements of the aero-engine blade. SUMMARY

[0003] The present application provides a blade machining clamp to solve the technical problems of the complex structure, cumbersome clamping process and easy interference of the existing blade clamp.

[0004] According to one aspect of the present application, a blade machining clamp is provided for clamping a blade of an aero-engine, the blade comprising a tenon, a blade body and a blade crown arranged in sequence along the length direction, the blade crown being provided with a sawtooth to be machined, the blade machining clamp comprising a tenon clamping device, a blade crown positioning device and a blade body pressing device.

[0005] The tenon clamping device is used to clamp the tenon of the blade.

[0006] The blade crown positioning device comprises a first positioning mechanism and a second positioning mechanism, the first positioning mechanism being arranged in the vertical direction and used to abut and position the bottom surface of the blade crown, and the second positioning mechanism being arranged in the horizontal direction and used to abut and position the side surface of the blade crown, so as to position the blade crown at the to-be-machined position and expose the sawtooth on the top surface of the blade crown through the cooperation of the first positioning mechanism and the second positioning mechanism.

[0007] The blade body pressing device comprises a steel belt and a tensioning mechanism, the first end of the steel belt being arranged below the side of the blade body away from the second positioning mechanism, the second end of the steel belt being wound from above the blade body to the side of the blade body facing the second positioning mechanism, and the tensioning mechanism being connected with the second end of the steel belt and used to tension the steel belt in the direction of the included angle towards the first positioning mechanism and the second positioning mechanism.

[0008] Preferably, the first positioning mechanism comprises a first positioning base, a first positioning shaft, a first spring and a first locking pin, the first positioning base is sequentially provided with a first shaft hole and a first receiving groove below the first shaft hole in the vertical direction, the side surface of the first positioning base is further provided with a first limiting hole in communication with the first shaft hole, the first positioning shaft is arranged in the first shaft hole and is used for sliding along the first shaft hole, the top end of the first positioning shaft is used for abutting and positioning the bottom surface of the leaf crown, the first spring is arranged in the first receiving groove and is used for upwardly pressing the bottom end of the first positioning shaft, and the first locking pin is arranged in the first limiting hole and is used for tightly fixing the first positioning shaft.

[0009] Preferably, the first positioning mechanism further comprises a shaft sleeve arranged on the first positioning base and a positioning sleeve connected with the first positioning shaft, the first positioning shaft is arranged on the shaft sleeve, the positioning sleeve is arranged on the outer periphery of the shaft sleeve and is used for sliding along the shaft sleeve, and the positioning sleeve is further used for abutting the upper surface of the first positioning base to limit the maximum stroke of the first positioning shaft moving away from the leaf crown.

[0010] Preferably, the first positioning shaft comprises a square shaft and a locking shaft arranged in sequence along the length direction, the first shaft hole comprises a square hole matched with the square shaft and used for circumferentially fixing the square shaft, and the locking shaft is provided with a locking groove matched with the first locking pin, the locking groove is arranged in extension along the axial direction of the first positioning shaft and is used for guiding sliding relative to the first locking pin.

[0011] Preferably, the first limiting hole is a threaded hole, and the first locking pin comprises a first threaded section matched with the first limiting hole and a driving handle coaxially connected with the first threaded section.

[0012] Preferably, the first locking pin further comprises a limiting ring arranged between the first threaded section and the driving handle, and the first positioning mechanism further comprises a limiting base mounted on the first positioning base, the limiting base is provided with a sliding groove and a limiting flange, the sliding groove is matched with the limiting ring and is used for guiding movement of the limiting ring, and the limiting flange is used for abutting the end surface of the limiting ring away from the first threaded section, so as to limit the maximum stroke of the first locking pin moving away from the first positioning shaft through the limiting flange.

[0013] Preferably, the second positioning mechanism comprises a second positioning base, a second positioning shaft, a second spring and a second locking pin, the second positioning base is provided with a second shaft hole in a horizontal direction, the second positioning base is further provided with a second limiting hole communicated with the second shaft hole in a radial direction of the second shaft hole, the second positioning shaft is arranged in the second shaft hole and is used for sliding along the second shaft hole, a first end of the second positioning shaft is used for abutting and positioning a side surface of the vane crown, the second spring is elastically pressed to a second end of the second positioning shaft in a direction towards the vane crown, and the second locking pin is arranged in the second limiting hole and is used for tightly fixing the second positioning shaft.

[0014] Preferably, the second limiting hole is a threaded hole, the second locking pin comprises a second threaded segment matched with the second limiting hole and a driving part coaxially connected with the second threaded segment, and the driving part is used for clamping a driving tool and driving the second locking pin to rotate relative to the second limiting hole by the driving tool.

[0015] Preferably, the vane body pressing device further comprises a fixing base, the fixing base is provided with a tensioning inclined surface inclined downward away from the steel belt corresponding to a second end of the steel belt, a first pin shaft is arranged on a first end of the steel belt and hinged to the fixing base, and a second pin shaft is arranged on the second end of the steel belt and used for abutting against the tensioning inclined surface.

[0016] The tensioning mechanism comprises a tensioning base, a tensioning screw, a tensioning spring and a tensioning nut, the tensioning base is provided with a tensioning hook used for hooking and pulling the second pin shaft, the tensioning base is provided with a through hole matched with the tensioning screw in a vertical direction, the through hole extends to form a waist-shaped hole away from the steel belt, the tensioning screw is arranged in the waist-shaped hole, the tensioning spring is sleeved on a segment of the tensioning screw below the tensioning base and is used for elastically pressing the tensioning base upward, and the tensioning nut is threadedly connected with a segment of the tensioning screw above the tensioning base.

[0017] Preferably, the tensioning mechanism further comprises a support rod fixed in a vertical direction, the bottom of the tensioning base is further provided with a guide groove extending away from the steel belt and supporting the support rod, and the guide groove and the tensioning hook are arranged on opposite sides of the waist-shaped hole.

[0018] The present application has the following beneficial effects:

[0019] The blade machining clamp provided by the application comprises a tenon clamping device, a first positioning mechanism and a second positioning mechanism, and a steel band.

[0020] In addition to the objects, features and advantages described above, the application has other objects, features and advantages. The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are intended to provide further understanding of the application and are incorporated herein for a purpose of explanations of the application and are not intended as an undue limitation to the application. In the drawings:

[0022] Figure 1 A perspective view of the blade machining clamp provided by the embodiment of the application;

[0023] Figure 2 A perspective view of the blade machining clamp shown in FIG. 1 after the first positioning seat is removed; Figure 1

[0024] A perspective view of the blade machining clamp shown in FIG. 1 from another angle; Figure 3 Figure 1 An exploded view of the blade machining clamp shown in FIG. 1.

[0025] Figure 4 LEGEND KEY: Figure 3

[0026] LEGEND KEY:

[0027] ​​1000, blade machining clamp; 1, tenon clamping device; 11, chuck; 12, mandrel; 2, blade crown positioning device; 21, first positioning mechanism; 211, first positioning seat; 212, first positioning shaft; 2121, square shaft; 2122, locking shaft; 213, first spring; 214, first locking pin; 2141, first threaded section; 2142, driving handle; 2143, limiting ring; 215, shaft sleeve; 216, positioning sleeve; 217, limiting seat; 22, second positioning mechanism; 221, second positioning seat; 222, second positioning shaft; 223, second spring; 224, second locking pin; 2241, second threaded section; 2242, driving part; 3, blade body pressing device; 31, steel belt; 311, first pin shaft; 312, second pin shaft; 32, tensioning mechanism; 321, tensioning seat; 3211, tensioning hook; 3212, waist-shaped hole; 3213, guide groove; 322, tensioning screw; 323, tensioning spring; 324, tensioning nut; 325, support rod; 326, gasket; 33, fixing seat; 331, tensioning inclined surface;

[0028] 2000, blade; 2001, tenon; 2002, blade body; 2003, blade crown. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0030] Figures 1 to 4 The blade machining clamp provided by the embodiments of the present application is shown together, which is used for clamping the blade 2000 of an aero-engine so as to process the blade 2000, the blade 2000 comprising a tenon 2001, a blade body 2002 and a blade crown 2003 arranged in sequence along the length direction, the blade crown 2003 being provided with sawteeth to be processed, the blade machining clamp being simple and efficient in structure, convenient and fast in clamping, high in positioning precision, capable of completely exposing the blade crown 2003 of the blade 2000 and not interfering with the processing of the blade crown 2003.

[0031] As Figure 1As shown, the blade machining clamp 1000 comprises a tenon clamping device 1, a blade crown positioning device 2 and a blade body pressing device 3, the tenon clamping device 1 is used for clamping the tenon 2001 of the blade 2000, the blade crown positioning device 2 comprises a first positioning mechanism 21 and a second positioning mechanism 22, the first positioning mechanism 21 is arranged in the vertical direction and is used for abutting and positioning the bottom surface of the blade crown 2003, the second positioning mechanism 22 is arranged in the horizontal direction and is used for abutting and positioning the side surface of the blade crown 2003, and then the height direction and the horizontal direction of the blade crown 2003 are positioned through the cooperation of the first positioning mechanism 21 and the second positioning mechanism 22 respectively, so that the blade crown 2003 is accurately positioned at the machining position and the sawteeth on the top surface of the blade crown 2003 are exposed.

[0032] Further, the tenon clamping device 1 comprises a chuck 11 and a core rod 12, the chuck 11 is used for clamping the tenon 2001, and the core rod 12 is used for being embedded in the tenon tooth of the tenon 2001 and abutting the chuck, so that the tenon 2001 is clamped and fixed through the cooperation of the chuck 11 and the core rod 12, the fit is more tight, and the clamping effect is better.

[0033] Further, the blade body pressing device 3 comprises a steel belt 31 and a tensioning mechanism 32, the first end of the steel belt 31 is arranged below the side of the blade body 2002 away from the second positioning mechanism 22, the second end of the steel belt 31 is wound from above the blade body 2002 to the side of the blade body 2002 towards the second positioning mechanism 22, the tensioning mechanism 32 is connected with the second end of the steel belt 31, and the tensioning mechanism 32 is used for tensioning the steel belt 31 in the direction of the included angle towards the first positioning mechanism 21 and the second positioning mechanism 22, so that the steel belt 31 has a first pressing force in the direction towards the first positioning mechanism 21 and a second pressing force in the direction towards the second positioning mechanism 22, the blade crown 2003 is pressed and fixed on the first positioning mechanism 21 and the second positioning mechanism 22 through the first pressing force and the second pressing force respectively, and the locking and fixing of the blade 2000 are realized.

[0034] In the blade machining clamp 1000, first, the tenon 2001 of the blade 2000 is clamped by the tenon clamping device 1, then the bottom surface and the side surface of the blade crown 2003 are respectively abutted and positioned by the first positioning mechanism 21 and the second positioning mechanism 22, the blade crown 2003 is accurately positioned at the machining position, and the sawtooth on the top surface of the blade crown 2003 is completely exposed, finally, the blade body 2002 is pressed tightly along the direction of the included angle of the first positioning mechanism 21 and the second positioning mechanism 22 by the steel belt 31, so that the blade 2000 can be simultaneously pressed tightly on the first positioning mechanism 21 and the second positioning mechanism 22, realizing the rapid clamping and positioning of the whole blade 2000. The structure is simple and efficient, effectively simplifies the clamping process, improves the clamping efficiency and clamping accuracy, meets the high-precision machining requirements of the aero-engine blade, and ensures the close fit between the steel belt 31 and the blade body 2002 by pressing the blade body 2002 of the blade 2000 with the flexible steel belt 31. While improving the clamping accuracy, it avoids the damage of the weak part of the blade body 2002 caused by the local mechanical clamping force, effectively protects the blade 2000, and secondly, the thickness of the steel belt 31 is thin, which can avoid protruding from the machining position of the blade crown 2003, and will not interfere with the machining of the blade crown 2003, which is more convenient for machining, thereby simplifying the machining steps and improving the machining efficiency and machining quality.

[0035] Please refer to Figure 2 The first positioning mechanism 21 comprises a first positioning seat 211, a first positioning shaft 212, a first spring 213 and a first locking pin 214. The first positioning seat 211 is sequentially provided with a first shaft hole and a first receiving groove in the vertical direction. The first receiving groove is located below the first shaft hole. The side surface of the first positioning seat 211 is further provided with a first limiting hole communicating with the first shaft hole. The first positioning shaft 212 is arranged in the first shaft hole and is used for sliding along the first shaft hole. The top end of the first positioning shaft 212 is used for abutting and positioning the bottom surface of the blade crown 2003. The first spring 213 is arranged in the first receiving groove and is used for upwardly pressing the bottom end of the first positioning shaft 212, so as to exert an elastic force on the first positioning shaft 212 in the direction towards the blade crown 2003. The first locking pin 214 is arranged in the first limiting hole and is used for tightly fixing the first positioning shaft 212, so as to realize the locking and fixing of the first positioning shaft 212.

[0036] Specifically, the bottom surface of the leaf crown 2003 is supported by the first positioning shaft 212, which can automatically adjust the support height of the first positioning shaft 212 upward under the elastic force of the first spring 213, so as to elastically push the leaf blade 2000 upward to the lower surface of the steel belt 31. At this time, the height of the leaf crown 2003 can be accurately adjusted by the pressing action of the steel belt 31. After the adjustment is completed, the first positioning shaft 212 is locked and fixed relative to the first positioning seat 211 through the first locking pin 214, so that the first positioning shaft 212 can stably support the leaf crown 2003. Therefore, adjusting the pressing height of the steel belt 31 can not only realize the pressing and fixing of the leaf blade 2000, but also flexibly adjust the processing height of the leaf crown 2003 during pressing the steel belt 31, so as to adapt to different processing requirements. Secondly, since the first spring 213 is arranged below the first positioning shaft 212, elastic buffering can be realized by the first spring 213 during clamping the leaf crown 2003, so as to avoid damage caused by rigid collision of the leaf crown 2003 with the first positioning shaft 212.

[0037] Preferably, the first positioning mechanism 21 further comprises a shaft sleeve 215 and a positioning sleeve 216. The shaft sleeve 215 is arranged on the upper surface of the first positioning seat 211 and coaxially arranged relative to the first shaft hole. The first positioning shaft 212 is arranged on the shaft sleeve 215 and can slide relative to the shaft sleeve 215. The positioning sleeve 216 is fixedly connected with the first positioning shaft 212. The positioning sleeve 216 is sleeved on the outer periphery of the shaft sleeve 215 and is used for sliding along the shaft sleeve 215. The positioning sleeve 216 is also used for abutting against the upper surface of the first positioning seat 211 to limit the maximum stroke of the first positioning shaft 212 moving away from the leaf crown 2003. Through the cooperation of the shaft sleeve 215 and the positioning sleeve 216, the movement direction of the first positioning shaft 212 can be guided and limited, the movement accuracy of the first positioning shaft 212 can be improved, and the movement stroke of the first positioning shaft 212 can be limited to avoid that the first positioning shaft 212 is completely separated from the leaf crown 2003, and at the same time, the positioning height of the leaf crown 2003 is prevented from being too low to affect the processing feed.

[0038] Preferably, the first positioning shaft 212 comprises a square shaft 2121 and a locking shaft 2122 arranged in sequence along the length direction, the first shaft hole comprises a square hole matched with the square shaft 2121 and used for circumferentially fixing the square shaft 2121, and the locking shaft 2122 is provided with a locking groove matched with the first locking pin 214 and used for guiding sliding of the first locking pin 214. The circumferential rotation of the first positioning shaft 212 is prevented by matching the square shaft 2121 with the square hole, the stability of the first positioning shaft 212 is improved, the locking groove can keep facing the first locking pin 214, the first locking pin 214 is guided to move by matching the locking groove with the first locking pin 214, the moving stability of the first positioning shaft 212 is further improved, and the first locking pin 214 can accurately abut against the locking groove when the first positioning shaft 212 is adjusted to different height positions.

[0039] Preferably, the first limiting hole is a threaded hole, the first locking pin 214 comprises a first threaded section 2141 matched with the first limiting hole and a driving handle 2142 coaxially connected with the first threaded section 2141, and the driving handle 2142 is used for holding by hand and rotating the first locking pin 214, so that the tightness of the first locking pin 214 can be directly adjusted without tools, and the positioning height of the leaf crown 2003 is more conveniently adjusted.

[0040] Preferably, the first locking pin 214 further comprises a limiting ring 2143 arranged between the first threaded section 2141 and the driving handle 2142, and the first positioning mechanism 21 further comprises a limiting seat 217 mounted on the first positioning seat 211, the limiting seat 217 is provided with a sliding groove and a limiting flange, the sliding groove is matched with the limiting ring 2143 and used for guiding movement of the limiting ring 2143, and the limiting flange is used for abutting against an end face of the limiting ring 2143 away from the first threaded section 2141, so as to limit the maximum stroke of the first locking pin 214 moving away from the first positioning shaft 212.

[0041] Specifically, when the first threaded section 2141 is rotated to adjust the axial position of the first locking pin 214 by the driving handle 2142, the limiting ring 2143 is supported by the sliding groove and guided to slide, the stability of the first locking pin 214 is improved, the first locking pin 214 is prevented from being skewed and stuck, the limiting flange is used for resisting the limiting ring 2143 to limit the axial movement stroke of the first locking pin 214, and the first locking pin 214 is prevented from completely separating from the first positioning seat 211.

[0042] Preferably, the second positioning mechanism 22 comprises a second positioning base 221, a second positioning shaft 222, a second spring 223 and a second locking pin 224. The second positioning base 221 is provided with a second shaft hole in the horizontal direction, and is further provided with a second limiting hole communicated with the second shaft hole in the radial direction of the second shaft hole. The second positioning shaft 222 is arranged in the second shaft hole and is used for sliding along the second shaft hole. The first end of the second positioning shaft 222 is used for abutting and positioning the side surface of the blade crown 2003. The second spring 223 is elastically pressed at the second end of the second positioning shaft 222 in the direction towards the blade crown 2003, so as to apply an elastic force to the second positioning shaft 222 in the direction towards the blade crown 2003. The second locking pin 224 is arranged in the second limiting hole and is used for tightly fixing the second positioning shaft 222, so as to realize the locking and fixing of the second positioning shaft 222 relative to the second positioning base 221.

[0043] Similarly, by supporting the side surface of the blade crown 2003 through the second positioning shaft 222, the horizontal supporting position of the second positioning shaft 222 can be automatically adjusted under the elastic force of the second spring 223, so as to elastically push the blade 2000 into the steel belt 31 in the horizontal direction. At this time, the horizontal position of the blade crown 2003 can be accurately adjusted through the tensioning action of the steel belt 31. After the adjustment is completed, the second positioning shaft 222 is locked and fixed relative to the second positioning base 221 through the second locking pin 224, so as to stably support the blade crown 2003 through the second positioning shaft 222. Therefore, adjusting the tensioning degree of the steel belt 31 can not only realize the compression and fixing of the blade 2000, but also flexibly adjust the horizontal position of the blade crown 2003 in the process of compressing the steel belt 31, so as to adapt to different processing requirements. In addition, since the second end of the second positioning shaft 222 is provided with the second spring 223, elastic buffering can be realized through the second spring 223 in the process of clamping the blade crown 2003, so as to avoid damage caused by rigid collision of the blade crown 2003 with the second positioning shaft 222.

[0044] Preferably, the second limiting hole is a threaded hole, the second locking pin 224 comprises a second threaded section 2241 matched with the second limiting hole and a driving portion 2242 coaxially connected with the second threaded section 2241, and the driving portion 2242 is used for clamping a driving tool and driving the second locking pin 224 to rotate relative to the second limiting hole by the driving tool. Since the horizontal position of the blade crown 2003 does not need to be adjusted during machining, the driving portion 2242 is configured as a structure for clamping the driving tool at this time, and specifically can be configured as an external hexagonal structure or an internal hexagonal structure, etc. The second locking pin 224 must be loosened by the driving tool, which can avoid the second locking pin 224 from being loosened by mistake during use, ensure the positioning accuracy, and more importantly, the structure can also reduce the volume of the driving portion 2242 to avoid interference of the driving portion 2242 on machining.

[0045] Please refer to Figure 3 and Figure 4 , the blade pressing device 3 further comprises a fixing seat 33, the fixing seat 33 is provided with a tensioning inclined surface 331 corresponding to the second end of the steel belt 31, the tensioning inclined surface 331 is arranged downwardly inclined away from the steel belt 31, the first end of the steel belt 31 is provided with a first pin shaft 311 hinged with the fixing seat 33, and the second end of the steel belt 31 is provided with a second pin shaft 312 used for abutting against the tensioning inclined surface 331.

[0046] Further, the tensioning mechanism 32 comprises a tensioning seat 321, a tensioning screw 322, a tensioning spring 323 and a tensioning nut 324, the tensioning seat 321 is provided with a tensioning hook 3211 used for hooking the second pin shaft 312, the tensioning seat 321 is provided with a through hole matched with the tensioning screw 322 in the vertical direction, the through hole extends to form a waist-shaped hole 3212 away from the steel belt 31, the tensioning screw 322 is arranged in the waist-shaped hole 3212, the tensioning spring 323 is sleeved on the segment of the tensioning screw 322 below the tensioning seat 321 and is used for upwardly pressing the tensioning seat 321, and the tensioning nut 324 is threadedly connected with the segment of the tensioning screw 322 above the tensioning seat 321.

[0047] In use, the tensioning hook 3211 is hung on the second pin shaft 312, and then the tensioning nut 324 is driven to rotate and press the tensioning seat 321 downward, the second pin shaft 312 is pressed by the tensioning hook 3211, and the second pin shaft 312 is driven to slide along the tensioning inclined surface 331, so that the second pin shaft 312 has a moving action towards the first positioning mechanism 21 and the second positioning mechanism 22, thereby tensioning the steel belt 31 by the second pin shaft 312, and when the second pin shaft 312 moves towards the second positioning mechanism 22, the tensioning seat 321 can be driven to slide horizontally relative to the tensioning screw 322 through the waist-shaped hole 3212, so that the tensioning hook 3211 remains in a state of tightly hooking the second pin shaft 312, and the tensioning strength is guaranteed. Therefore, by cooperating the second pin shaft 312 and the tensioning inclined surface 331, the tensioning and fixing of the steel belt 31 in two directions can be realized by only driving the tensioning nut 324 to rotate and adjust, which is simple in structure, efficient and convenient to use.

[0048] Preferably, the tensioning mechanism 32 further comprises a support rod 325 fixedly arranged in the vertical direction, the bottom of the tensioning seat 321 is further provided with a guide groove 3213 extending away from the steel belt 31 and supporting the support rod 325, and the guide groove 3213 and the tensioning hook 3211 are separately arranged on opposite sides of the waist-shaped hole 3212. By supporting the side of the tensioning seat 321 away from the steel belt 31 by the support rod 325, when the axial position of the tensioning nut 324 is adjusted, the tensioning stroke of the steel belt 31 can be amplified by using the lever principle, the clamping efficiency is improved, and in the process of driving the second pin shaft 312 to slide along the tensioning inclined surface 331 by the tensioning seat 321, the stability and clamping precision of the tensioning seat 321 are improved by the guide cooperation of the guide groove 3213 and the support rod 325.

[0049] Further, the tensioning mechanism 32 further comprises a gasket 326 arranged between the tensioning nut 324 and the tensioning seat 321, the tensioning nut 324 and the tensioning seat 321 are separated by the gasket 326, the rotation smoothness of the tensioning nut 324 is improved, and the rotation of the tensioning nut 324 driving the tensioning seat 321 is avoided.

[0050] Still further, one side of the gasket 326 towards the tensioning seat 321 is provided with a tapered guide portion, the tapered guide portion is embedded in the waist-shaped hole 3212 and used for sliding along the waist-shaped hole 3212, and the stability and smoothness of the movement of the tensioning seat 321 along with the second pin shaft 312 are further improved.

[0051] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A blade machining fixture for clamping an aero-engine blade (2000), said blade (2000) comprising a tenon (2001), a blade body (2002), and a blade crown (2003) arranged sequentially along its length, said blade crown (2003) having serrations to be machined, characterized in that, The blade processing fixture includes a tenon clamping device (1), a blade crown positioning device (2), and a blade clamping device (3); The tenon clamping device (1) is used to clamp the tenon (2001) of the blade (2000); The leaf crown positioning device (2) includes a first positioning mechanism (21) and a second positioning mechanism (22). The first positioning mechanism (21) is arranged vertically and is used to abut against the bottom surface of the leaf crown (2003). The second positioning mechanism (22) is arranged horizontally and is used to abut against the side surface of the leaf crown (2003). The leaf crown (2003) is positioned in the processing position and the serrations on the top surface of the leaf crown (2003) are exposed through the cooperation of the first positioning mechanism (21) and the second positioning mechanism (22). The blade pressing device (3) includes a steel strip (31) and a tensioning mechanism (32). The first end of the steel strip (31) is located below the blade (2002) on the side away from the second positioning mechanism (22). The second end of the steel strip (31) is wound around the blade (2002) from above to the side of the blade (2002) facing the second positioning mechanism (22). The tensioning mechanism (32) is connected to the second end of the steel strip (31) and is used to tension the steel strip (31) along the angle direction facing the first positioning mechanism (21) and the second positioning mechanism (22). The blade clamping device (3) further includes a fixing seat (33). The fixing seat (33) has a tensioning inclined surface (331) that is inclined downward in a direction away from the steel strip (31) at the second end of the steel strip (31). The first end of the steel strip (31) is provided with a first pin (311) that is hinged to the fixing seat (33). The second end of the steel strip (31) is provided with a second pin (312) for abutting against the tensioning inclined surface (331). The tensioning mechanism (32) includes a tensioning seat (321), a tensioning screw (322), a tensioning spring (323), and a tensioning nut (324). The tensioning seat (321) is provided with a tensioning hook (3211) for hooking the second pin (312). The tensioning seat (321) has a through hole in the vertical direction that is adapted to the tensioning screw (322). The through hole is located away from the steel strip (31). An elongated waist-shaped hole (3212) is formed, the tensioning screw (322) passes through the waist-shaped hole (3212), the tensioning spring (323) is sleeved on the segment of the tensioning screw (322) located below the tensioning seat (321) and is used to spring the tensioning seat (321) upward, and the tensioning nut (324) is threadedly connected to the segment of the tensioning screw (322) located above the tensioning seat (321).

2. The blade machining fixture according to claim 1, characterized in that, The first positioning mechanism (21) includes a first positioning seat (211), a first positioning shaft (212), a first spring (213), and a first locking pin (214). The first positioning seat (211) has a first shaft hole and a first receiving groove located below the first shaft hole in the vertical direction. The side of the first positioning seat (211) is also provided with a first limiting hole communicating with the first shaft hole. The first positioning shaft (212) passes through the first shaft hole and is used to slide along the first shaft hole. The top end of the first positioning shaft (212) is used to abut against the bottom surface of the positioning crown (2003). The first spring (213) is provided in the first receiving groove and is used to press the bottom end of the first positioning shaft (212) upward. The first locking pin (214) passes through the first limiting hole and is used to abut against and fix the first positioning shaft (212).

3. The blade machining fixture according to claim 2, characterized in that, The first positioning mechanism (21) further includes a bushing (215) disposed on the first positioning seat (211) and a positioning sleeve (216) connected to the first positioning shaft (212). The first positioning shaft (212) passes through the bushing (215), and the positioning sleeve (216) is sleeved on the outer periphery of the bushing (215) and is used to slide along the bushing (215). The positioning sleeve (216) is also used to abut against the upper surface of the first positioning seat (211) to limit the maximum stroke of the first positioning shaft (212) moving away from the blade crown (2003).

4. The blade machining fixture according to claim 2, characterized in that, The first positioning shaft (212) includes a square shaft (2121) and a locking shaft (2122) arranged sequentially along the length direction. The first shaft hole includes a square hole that is adapted to the square shaft (2121) and is used to fix the square shaft (2121) circumferentially. The locking shaft (2122) is provided with a locking groove that is adapted to the first locking pin (214). The locking groove extends along the axial direction of the first positioning shaft (212) and is used to guide and slide relative to the first locking pin (214).

5. The blade machining fixture according to claim 2, characterized in that, The first limiting hole is a threaded hole, and the first locking pin (214) includes a first threaded section (2141) adapted to the first limiting hole and a drive handle (2142) coaxially connected to the first threaded section (2141).

6. The blade machining fixture according to claim 5, characterized in that, The first locking pin (214) further includes a limiting ring (2143) disposed between the first threaded section (2141) and the drive handle (2142). The first positioning mechanism (21) further includes a limiting seat (217) mounted on the first positioning seat (211). The limiting seat (217) is provided with a sliding groove and a limiting flange. The sliding groove is adapted to the limiting ring (2143) and is used to guide the movement of the limiting ring (2143). The limiting flange is used to abut against the end face of the limiting ring (2143) away from the first threaded section (2141), thereby limiting the maximum stroke of the first locking pin (214) moving away from the first positioning shaft (212) by the limiting flange.

7. The blade machining fixture according to claim 1, characterized in that, The second positioning mechanism (22) includes a second positioning seat (221), a second positioning shaft (222), a second spring (223), and a second locking pin (224). The second positioning seat (221) has a second shaft hole in the horizontal direction. The second positioning seat (221) also has a second limiting hole in the radial direction of the second shaft hole, which communicates with the second shaft hole. The second positioning shaft (222) passes through the second shaft hole and is used to slide along the second shaft hole. The first end of the second positioning shaft (222) is used to abut against the side of the blade crown (2003). The second spring (223) presses against the second end of the second positioning shaft (222) in the direction toward the blade crown (2003). The second locking pin (224) passes through the second limiting hole and is used to abut against and fix the second positioning shaft (222).

8. The blade machining fixture according to claim 7, characterized in that, The second limiting hole is a threaded hole. The second locking pin (224) includes a second threaded section (2241) adapted to the second limiting hole and a driving part (2242) coaxially connected to the second threaded section (2241). The driving part (2242) is used to engage the driving tool and allow the driving tool to drive the second locking pin (224) to rotate relative to the second limiting hole.

9. The blade machining fixture according to claim 1, characterized in that, The tensioning mechanism (32) further includes a support rod (325) fixedly arranged in the vertical direction. The bottom of the tensioning seat (321) is also provided with a guide groove (3213) extending in a direction away from the steel strip (31) and supported by the support rod (325). The guide groove (3213) and the tensioning hook (3211) are respectively arranged on opposite sides of the waist-shaped hole (3212).

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