Aero-engine rocker arm machining process

Abstract

The invention discloses an aero-engine rocker arm machining process, and belongs to the technical field of aviation spare part manufacturing. The method comprises the following steps: step 1, milling a cylindrical surface: numerical milling an outer circular surface A and an outer circular surface B as a finish machining reference of a next machining process; 2, the upper side appearance of the blank is machined, specifically, the lower end face A, the lower surface, the lower end face B and the annular groove B are subjected to rough milling and finish milling, and a round hole A and a round hole B are drilled, reamed and bored; and 3, the lower side appearance of the blank is machined, specifically, the upper end face A, the upper surface, the upper end face B and the annular groove A are subjected to rough milling and finish milling, and the rocker arm is obtained. A plurality of working procedures are combined into one working procedure for machining, so that the machining period is shortened, the machining efficiency of the rocker arm is improved, the benchmark between the working procedures is unified, the machining precision and the size stability of the rocker arm are improved, the round hole A and the round hole B are ensured to meet the position degree requirement, and the situation that the rocker arm is scrapped due to out-of-tolerance machining is not prone to occurring.

Description

Technical Field

[0001] The invention relates to a processing technology for a rocker arm of an aero-engine, and belongs to the technical field of manufacturing aero-parts. Background Art

[0002] The structure of a certain aircraft engine rocker arm 1 is as follows Figures 1 to 4 As shown, the rocker arm 1 includes a cylinder A101 and a cylinder B107. A circular hole A102 is coaxially processed on the cylinder A101. The cylinder B107 and the cylinder A101 are arranged side by side, and the outer cylindrical surface B114 of the cylinder B107 is connected to the outer cylindrical surface A115 of the cylinder A101 through the inclined arm 104. A circular hole B109 is coaxially processed on the cylinder B107. An annular groove A110 is provided on the upper end surface B108 of the cylinder B107, and an annular groove B111 is provided on the lower end surface B112. The material of the rocker arm 1 is titanium alloy, and there are requirements for position accuracy and verticality, etc., and the processing accuracy is high. At present, the following processes are mainly used to process the rocker arm 1: Step 1, plane milling: take the upper end face B108 as the supporting surface, clamp the blank with the blank shape as the positioning reference, and then process the lower end face B112 and the lower end face A113 of the cylinder A101 as the finishing reference for the next machining process; Step 2, milling the profile, drilling and reaming: With the lower end face A113 as the support surface, the blank is clamped with the blank shape as the positioning reference, the upper end face B108 on the blank, the upper surface 105 of the inclined arm 104 and the upper end face A103 of the cylinder A101 are milled, and the circular holes A102 and B109 are roughly drilled and reamed; Step 3, milling the outer shape: take the circular holes A102 and B109 as the positioning reference, take the upper end surface A103 as the supporting surface, clamp the blank from the lower end surface A113, and mill the outer cylindrical surface A115 and the outer cylindrical surface B114; Step 4, milling plane, expanding and boring: take the upper end surface B108 as the supporting surface, take the circular hole B109 and the outer cylindrical surface A115 as the positioning reference, clamp the blank from the lower end surface B112, and finely mill the lower end surface A113, the lower surface 106 of the inclined arm 104 and the finely expanded and bored circular hole A102; Step 5, milling plane, boring and milling groove: take the upper end face A103 as the supporting surface, take the circular hole A102 and the outer cylindrical surface B114 as the positioning reference, clamp the blank from the lower end face A113, finish mill the lower end face B112 and the annular groove B111, and expand and bore the circular hole B109; Step 6, milling another groove: take the upper end surface A103 as the supporting surface, take the circular holes A102 and B109 as the positioning reference, clamp the blank from the upper end surface A103, mill the annular groove A110, and obtain the rocker arm 1.

[0003] However, this process has the disadvantages of many processing steps, long processing cycle, unstable dimensions, and easy processing out of tolerance resulting in scrapped parts. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a processing technology for an aircraft engine rocker arm.

[0005] The present invention is achieved through the following technical solutions: A process for machining an aero-engine rocker arm comprises the following steps: Step 1, milling cylindrical surface: install and fix the blank on the fixture A. The fixture A uses the lower end surface A and the lower end surface B on the blank as the supporting surface, and the outer cylindrical surface at both ends of the blank as the positioning reference. Press the upper end surface A and the upper end surface B on the blank to clamp the blank, and then digitally mill the outer cylindrical surface A and the outer cylindrical surface B as the finishing reference for the next machining process; Step 2, machining the upper side shape of the blank: the blank is fixed on the fixture B, the fixture B uses the upper end face A and the upper end face B on the blank as the supporting surface, and uses the outer cylindrical surface A and the outer cylindrical surface B obtained by the milling in step 1 on the blank as the positioning reference to clamp the blank, and then rough mill and fine mill the lower end face A, the lower surface, the lower end face B and the annular groove B, and drill and expand the circular hole A and the circular hole B; Step 3, process the lower side shape of the blank: install and fix the blank on the fixture C. The fixture C uses the lower end face A and the lower end face B obtained by the fine milling in step 2 on the blank as the supporting surface, and uses the circular holes A and the circular holes B obtained by the expansion and boring in step 2 on the blank as the positioning reference to realize the blank clamping, and then rough mill and fine mill the upper end face A, the upper surface, the upper end face B and the annular groove A to obtain the rocker arm.

[0006] The clamp A includes a base and a cross-shaped fixing frame. A slot A is provided on the base. Circular positioning grooves are recessed on the top surface of the base and the bottom surface of the slot A. Two non-adjacent ends of one group of the cross-shaped fixing frame are connected to the base by locking screws A.

[0007] The depth of the cylindrical positioning groove on the base is not greater than 1.8 mm.

[0008] The method for installing and fixing the blank to the fixture A in the step 1 is: placing the blank on the base, supporting the lower end surface A on the blank through the bottom surface of the circular positioning groove at the notch A, and positioning the outer cylindrical surface of one end of the blank through the circular positioning groove; supporting the lower end surface B on the blank through the bottom surface of the circular positioning groove on the top surface of the base, and positioning the outer cylindrical surface of the other end of the blank through the circular positioning groove; connecting one group of non-adjacent two ends on the cross-shaped fixing frame to the base through the locking screw A, and tightening the locking screw A to install and fix the blank to the fixture A.

[0009] The clamp B includes a pallet and a plurality of clamping mechanisms, which are evenly distributed on the pallet in a circular array. The clamping mechanisms are connected to the pallet via a plurality of positioning pins and are connected to the pallet via a plurality of screws A.

[0010] A pull nail is connected to the center of the bottom of the pallet through a locking screw C. A plurality of angular locators are evenly distributed in a circular array around the pull nail at the bottom of the pallet, and the angular locators are connected to the pallet through a locking screw B.

[0011] The clamping mechanism includes a clamping block and two locking screws D. A slot B is provided on the top of the clamping block. Two groups of arc-shaped positioning grooves are provided on the top of the clamping block, and the center connecting line of the two arc-shaped positioning grooves in each group of arc-shaped positioning grooves crosses the slot B. Two elastic grooves are provided side by side on the top of the clamping block. The two elastic grooves are both perpendicular to the slot B and pass through the two groups of arc-shaped positioning grooves one by one. The two locking screws D are coaxially arranged along the length direction of the slot B and are both threadedly connected to the clamping block. The two locking screws D are used to narrow the two elastic grooves one by one.

[0012] A blind hole for avoidance is coaxially arranged on the bottom surface of the arc-shaped positioning groove.

[0013] The method for installing and fixing the blank to the fixture B in step 2 is: support the upper end face A and the upper end face B on the blank through the bottom surfaces of the two arc-shaped positioning grooves in the same group, and position the outer cylindrical surface A and the outer cylindrical surface B on the blank obtained by milling in step 1 through the two arc-shaped positioning grooves in the group, and then tighten the locking screw D close to the blank to achieve clamping of one blank; similarly, the other blank is also installed and fixed to the fixture B.

[0014] The clamp C comprises a bottom plate and two L-shaped support blocks symmetrically arranged on the bottom plate, and a plurality of expansion mechanisms are arranged on the L-shaped support blocks.

[0015] The expansion mechanism includes two expansion components, the lower ends of the two expansion components are correspondingly installed in the two vertical mounting holes on the L-shaped support block, and the upper end of one of the expansion components extends from the low-step surface at the top of the L-shaped support block, and the upper end of the other expansion component extends from the high-step surface at the top of the L-shaped support block.

[0016] The expansion assembly includes an inner expansion sleeve, the lower end of which is inserted into the vertical mounting hole and connected to the bottom of the L-shaped support block via a locking screw E, and the upper end of the inner expansion sleeve is threadedly connected with a cone-head expansion bolt.

[0017] A limiting blind hole is radially arranged on the outer circumferential surface of the inner expansion sleeve, a set screw is threadedly connected to the L-shaped support block, and one end of the set screw extends into the limiting blind hole.

[0018] A positioning ring is coaxially arranged at the upper end surface of the vertical mounting hole, and the positioning ring is integrally formed with the L-shaped supporting block.

[0019] The method for fixing the blank to the fixture C in step 3 is: the circular hole B obtained by boring the blank in step 2 is put on the inner expansion sleeve extending from the high-step surface at the top of the L-shaped support block, and the circular hole A obtained by boring the blank in step 2 is put on the inner expansion sleeve extending from the low-step surface at the top of the L-shaped support block, and then the blank is pressed down so that the lower end face A and the lower end face B obtained by fine milling in step 2 on the blank are respectively in contact with the upper end faces of the corresponding positioning rings, and then the cone head expansion bolts are tightened to expand the upper end of the inner expansion sleeve, thereby achieving the corresponding clamping of one blank on a tightening mechanism; similarly, other blanks are clamped one by one through the remaining tightening mechanisms on the fixture C.

[0020] The beneficial effects of the present invention are: 1. In step 2, after clamping the blank once with fixture B, the rough milling and fine milling of the lower end face A, the lower surface, the lower end face B and the annular groove B, and the drilling and boring of the circular holes A and B can be completed. Multiple processes are combined into one process for processing, which not only shortens the processing cycle and improves the processing efficiency of the rocker arm, but also unifies the benchmarks between processes, improves the processing accuracy and dimensional stability of the rocker arm, and ensures that the circular holes A and B meet the position requirements, and it is not easy to cause the rocker arm to be scrapped due to processing tolerance.

[0021] 2. In step 3, after clamping the blank once with fixture C, the rough milling and fine milling of the upper end face A, the upper surface, the upper end face B and the annular groove A can be completed, and multiple processes are combined into one process for processing, which not only shortens the processing cycle and improves the processing efficiency of the rocker arm, but also unifies the benchmarks between processes, improves the processing accuracy and dimensional stability of the rocker arm, and is less likely to cause the rocker arm to be scrapped due to processing out of tolerance.

[0022] 3. In fixture B, four clamps are installed on the pallet, and each clamp can clamp two blanks at the same time. That is to say, fixture B can clamp eight blanks at a time, greatly improving the processing efficiency of the rocker arm.

[0023] 4. In fixture C, two L-shaped support blocks are installed on the bottom plate, and each L-shaped support block is installed with multiple expansion mechanisms for expanding the blanks. That is to say, fixture C can clamp eight blanks at a time, greatly improving the processing efficiency of the rocker arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a parts diagram of the rocker arm of the present invention; Figure 2 for Figure 1 Section view along AA; Figure 3 It is a schematic diagram of the top view of the rocker arm of the present invention; Figure 4 for Figure 3 Sectional view along BB; Figure 5 It is a schematic structural diagram of the blank of the present invention; Figure 6 This is a schematic diagram of the structure of the fixture A of the present invention after clamping the blank; Figure 7 for Figure 6 Exploded diagram of Figure 8 This is a schematic diagram of the main structure of the blank of the present invention when it is processed in step 1; Fig. 9 for Figure 8 A top view of Fig.10 A partial cross-sectional view of a clamp B of the present invention; Fig.11 It is a schematic diagram of the top view of the structure of the clamp B of the present invention; Fig.12 A partial cross-sectional view of the tray, the angle locator and the rivet of the present invention after assembly; Fig.13 It is a schematic diagram of the three-dimensional structure of the tray of the present invention; Fig.14 It is a structural schematic diagram of the angular locator of the present invention; Fig.15 It is a schematic structural diagram of the pull nail of the present invention; Fig.16 It is a structural schematic diagram of the clamping block of the present invention; Fig.17 It is a schematic diagram of the top view of the clamping block of the present invention; Fig.18 for Fig.17 Sectional view along CC; Fig.19 It is a schematic diagram of the top view of the structure of the blank of the present invention when the step 2 processing is completed; Fig. 20 for Fig.19 Sectional view along DD; Fig.21 It is a schematic diagram of the top view of the structure of the fixture C of the present invention after clamping the blank; Fig. 22 It is a partial cross-sectional view of the fixture C of the present invention after clamping the blank; Fig.23 This is a schematic diagram of the three-dimensional structure of the fixture C of the present invention after clamping the blank; Fig.24 It is a schematic diagram of the structure of the L-shaped support block of the present invention; Fig.25 It is a schematic diagram of the structure of the inner expansion sleeve of the present invention; Fig.26 It is a schematic structural diagram of a cone head expansion bolt of the present invention; Fig. 27 It is a top view of the blank of the present invention after completing step 3 processing; Fig.28 for Fig. 27 Sectional view along EE.

[0025] In the figure: 1- rocker arm, 101- cylinder A, 102- circular hole A, 103- upper end surface A, 104- oblique arm, 105- upper surface, 106- lower surface, 107- cylinder B, 108- upper end surface B, 109- circular hole B, 110- annular groove A, 111- annular groove B, 112- lower end surface B, 113- lower end surface A, 114- outer cylindrical surface B, 115- outer cylindrical surface A, 3- base, 30- notch A, 4- cross-shaped fixing frame, 5- locking screw A, 6- tray, 61- countersunk hole, 62- pin hole A, 63- angular locator, 64- locking screw B, 65- pull nail, 6 6-locking screw C, 67-pull rivet positioning hole, 68-slot hole, 7-clamping mechanism, 71-clamping block, 710-slot B, 711-elastic groove, 712-threaded hole B, 713-threaded hole C, 714-avoidance blind hole, 715-arc shaped positioning groove, 72-locking screw D, 8-screw A, 9-locating pin, 10-base plate, 11-L-shaped support block, 1100-locating ring, 1101-locking screw E, 1102-setting screw, 1103-inner expansion sleeve, 1104-cone head expansion bolt, 1105-low step surface, 1106-high step surface, 1107-limiting blind hole. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0027] like Figures 1 to 28 As shown, the aero-engine rocker arm processing technology described in the present invention comprises the following steps: Step 1, milling cylindrical surface: install and fix the blank on the fixture A. The fixture A uses the lower end surface A113 and the lower end surface B112 on the blank as the supporting surface, and the outer cylindrical surface at both ends of the blank as the positioning reference. Press the upper end surface A103 and the upper end surface B108 on the blank to clamp the blank, and then mill the outer cylindrical surface A115 and the outer cylindrical surface B114 as the finishing reference for the next machining process. When milling the outer cylindrical surface A115 and the outer cylindrical surface B114, local black skin is allowed.

[0028] Step 2, process the upper side shape of the blank: install and fix the blank on the fixture B. The fixture B uses the upper end face A103 and the upper end face B108 on the blank as the supporting surface, and uses the outer cylindrical surface A115 and the outer cylindrical surface B114 obtained by milling in step 1 on the blank as the positioning reference to clamp the blank, and then rough and fine mill the lower end face A113, the lower surface 106, the lower end face B112 and the annular groove B111, and drill and expand the circular hole A102 and the circular hole B109.

[0029] Step 3, processing the lower side shape of the blank: install and fix the blank on the fixture C. The fixture C uses the lower end face A113 and the lower end face B112 obtained by the fine milling in step 2 on the blank as the supporting surface, and uses the circular holes A102 and the circular holes B109 obtained by the expansion and boring in step 2 on the blank as the positioning reference to clamp the blank, and then roughly mill and fine mill the upper end face A103, the upper surface 105, the upper end face B108 and the annular groove A110 to obtain the rocker arm 1. In step 2, after clamping the blank once with fixture B, the rough milling and fine milling of the lower end face A113, the lower surface 106, the lower end face B112 and the annular groove B111, and the drilling and boring of the circular holes A102 and B109 can be completed, and multiple processes are combined into one process for processing, which not only shortens the processing cycle and improves the processing efficiency of the rocker arm 1, but also unifies the benchmarks between processes, improves the processing accuracy and dimensional stability of the rocker arm 1, and ensures that the circular holes A102 and B109 meet the position requirements, and it is not easy for the rocker arm 1 to be scrapped due to processing out of tolerance.

[0030] Similarly, in step 3, after clamping the blank once with fixture C, the rough milling and fine milling of the upper end face A103, the upper surface 105, the upper end face B108 and the annular groove A110 can be completed, and multiple processes are combined into one process for processing, which not only shortens the processing cycle and improves the processing efficiency of the rocker arm 1, but also unifies the benchmarks between processes, improves the processing accuracy and dimensional stability of the rocker arm 1, and is less likely to cause the rocker arm 1 to be scrapped due to processing out of tolerance.

[0031] The clamp A comprises a base 3 and a cross-shaped fixing frame 4. A notch A30 is provided on the base 3. A circular positioning groove is provided on the top surface of the base 3 and the bottom surface of the notch A30. Two non-adjacent ends of one group of the cross-shaped fixing frame 4 are connected to the base 3 by locking screws A5. When in use, the locking screws A5 are threadedly connected to the threaded holes A on the base 3.

[0032] The depth of the cylindrical positioning groove on the base 3 is not greater than 1.8 mm. The height of the outer cylindrical surface of the two ends of the blank inserted into the cylindrical positioning groove is not more than 1.8 mm, and the height of the outer cylindrical surface A115 and the outer cylindrical surface B114 on the blank that have not been milled is not more than 1.8 mm, ensuring that the material of this part of the outer cylindrical surface that has not been milled in step 1 can be removed during the rough milling and fine milling of the lower end surface A113 and the lower end surface B112 in step 2.

[0033] The method for installing and fixing the blank to the fixture A in step 1 is: placing the blank on the base 3, supporting the lower end face A113 on the blank through the bottom face of the circular positioning groove at the notch A30, and positioning the outer cylindrical surface of one end of the blank through the circular positioning groove; supporting the lower end face B112 on the blank through the bottom face of the circular positioning groove on the top surface of the base 3, and positioning the outer cylindrical surface of the other end of the blank through the circular positioning groove; connecting one group of non-adjacent two end portions on the cross-shaped fixing frame 4 to the base 3 through the locking screw A5, and tightening the locking screw A5 to install and fix the blank to the fixture A.

[0034] The clamp B comprises a tray 6 and four clamping mechanisms 7, which are evenly distributed on the tray 6 in a circular array, and the clamping mechanisms 7 are connected to the tray 6 through a plurality of positioning pins 9, and are connected to the tray 6 through a plurality of screws A8. When in use, a countersunk hole 61 is processed on the tray 6 at a position corresponding to the screw A8, and the countersunk head of the countersunk hole 61 faces downward, so that the upper end of the screw A8 passes through the countersunk hole 61 and is threadedly connected to the threaded hole C713 at the bottom of the clamp block 71.

[0035] The center of the bottom of the tray 6 is connected with a rivet 65 through a locking screw C66. The bottom of the tray 6 is evenly provided with a plurality of angular locators 63 in a circular array with the rivet 65 as the center, and the angular locators 63 are connected to the tray 6 through a locking screw B64. When in use, a rivet positioning hole 67 is processed at the center of the bottom of the tray 6, and a plurality of slots 68 for installing the angular locators 63 are evenly processed in a circular array with the rivet positioning hole 67 as the center. A pin hole A62 is processed at the top of the tray 6, and a pin hole B is processed at the bottom of the clamp block 71 at a position corresponding to the pin hole A62. The pin hole A62 and the pin hole B are used to install the positioning pin 9. The rivet 65 and the plurality of angular locators 63 are installed at the bottom of the tray 6 to facilitate the positioning and installation of the fixture B on the workbench of the CNC milling machine. The workbench hole is equipped with a soft claw to clamp the rivet 65, so as to achieve the fixation of the fixture B.

[0036] The clamping mechanism 7 includes a clamping block 71 and two locking screws D72. A slot B710 is provided on the top of the clamping block 71. Two groups of arc-shaped positioning grooves 715 are provided on the top of the clamping block 71, and a center connecting line of two arc-shaped positioning grooves 715 in each group of arc-shaped positioning grooves 715 spans the slot B710. Two elastic grooves 711 are provided side by side on the top of the clamping block 71. The two elastic grooves 711 are both perpendicular to the slot B710 and pass through the two groups of arc-shaped positioning grooves 715 one by one. The two locking screws D72 are coaxially arranged along the length direction of the slot B710 and are both threadedly connected to the clamping block 71. The two locking screws D72 are used to narrow the two elastic grooves 711 one by one. When in use, two threaded holes B712 are coaxially processed on the clamp block 71 between the two elastic grooves 711. The two threaded holes B712 are used for one-to-one threaded connection with the two locking screws D72, so as to facilitate narrowing the elastic groove 711 by the locking screws D72 to achieve locking and fixing of the blank.

[0037] The bottom surface of the arc-shaped positioning groove 715 is coaxially provided with an avoidance blind hole 714. This avoids the contact between the tool and the clamping block 71 when drilling or boring the circular holes A102 and B109, which helps to extend the service life of the tool.

[0038] The method for installing and fixing the blank to the fixture B in step 2 is: supporting the upper end face A103 and the upper end face B108 on the blank through the bottom surfaces of the two arc-shaped positioning grooves 715 in the same group, and positioning the outer cylindrical surface A115 and the outer cylindrical surface B114 obtained by milling in step 1 on the blank through the two arc-shaped positioning grooves 715 in the group, and then tightening the locking screw D72 close to the blank, thereby achieving the clamping of one blank; similarly, the other blank is also installed and fixed to the fixture B.

[0039] The clamp C comprises a bottom plate 10 and two L-shaped support blocks 11 symmetrically arranged on the bottom plate 10 , and a plurality of expansion mechanisms are arranged on the L-shaped support blocks 11 .

[0040] The tensioning mechanism includes two tensioning components, the lower ends of the two tensioning components are correspondingly installed in the two vertical mounting holes on the L-shaped support block 11, and the upper end of one of the tensioning components extends from the low-step surface 1105 at the top of the L-shaped support block 11, and the upper end of the other tensioning component extends from the high-step surface 1106 at the top of the L-shaped support block 11.

[0041] The expansion assembly includes an inner expansion sleeve 1103, the lower end of which is inserted into the vertical mounting hole and connected to the bottom of the L-shaped support block 11 via a locking screw E1101, and the upper end of the inner expansion sleeve 1103 is threadedly connected with a cone head expansion bolt 1104.

[0042] A limiting blind hole 1107 is radially provided on the outer circumferential surface of the inner expansion sleeve 1103, and a set screw 1102 is threadedly connected to the L-shaped support block 11, and one end of the set screw 1102 extends into the limiting blind hole 1107. The inner expansion sleeve 1103 is limited in the circumferential direction by the set screw 1102 to prevent the inner expansion sleeve 1103 from rotating with the cone head expansion bolt 1104 when the cone head expansion bolt 1104 is rotated.

[0043] A positioning ring 1100 is coaxially disposed at the upper end surface of the vertical mounting hole, and the positioning ring 1100 is integrally formed with the L-shaped support block 11. When in use, the outer diameter of the positioning ring 1100 is not greater than the diameter of the outer cylindrical surface A115 and the outer cylindrical surface B114, so as to improve the positioning accuracy of the positioning ring 1100 to the lower end surface A113 and the lower end surface B112.

[0044] The method for fixing the blank to the fixture C in the step 3 is as follows: the circular hole B109 obtained by boring the blank in step 2 is inserted into the inner expansion sleeve 1103 extending from the high-step surface 1106 at the top of the L-shaped support block 11, and the circular hole A102 obtained by boring the blank in step 2 is inserted into the inner expansion sleeve 1103 extending from the low-step surface 1105 at the top of the L-shaped support block 11, and then the blank is pressed down so that the lower end face A113 and the lower end face B112 obtained by fine milling in step 2 on the blank are respectively in contact with the upper end faces of the corresponding positioning rings 1100, and then the cone head expansion bolts 1104 are tightened to expand the upper end of the inner expansion sleeve 1103, thereby realizing the corresponding clamping of one blank on a tightening mechanism; similarly, other blanks are clamped one by one through the remaining tightening mechanisms on the fixture C.

Claims

1. A process for machining an aircraft engine rocker arm, characterized in that: The following steps are involved: Step 1, milling cylindrical surface: the blank is mounted and fixed on the fixture A. The fixture A uses the lower end surface A (113) and the lower end surface B (112) on the blank as the supporting surface, and the outer cylindrical surfaces at both ends of the blank as the positioning reference. The upper end surface A (103) and the upper end surface B (108) on the blank are pressed to clamp the blank. Then, the outer cylindrical surface A (115) and the outer cylindrical surface B (114) are milled as the finishing reference for the next machining process. Step 2, machining the upper shape of the blank: the blank is mounted and fixed on the fixture B. The fixture B uses the upper end surface A (103) and the upper end surface B (108) on the blank as the supporting surface, and uses the outer cylindrical surface A (115) and the outer cylindrical surface B (114) obtained by milling in step 1 on the blank as the positioning reference to clamp the blank, and then rough milling and fine milling the lower end surface A (113), the lower surface (106), the lower end surface B (112) and the annular groove B (111), and drilling and boring the circular hole A (102) and the circular hole B (109); Step 3, machining the lower side shape of the blank: the blank is mounted and fixed on the fixture C. The fixture C uses the lower end face A (113) and the lower end face B (112) obtained by fine milling on the blank in step 2 as the supporting surface, and uses the circular hole A (102) and the circular hole B (109) obtained by boring on the blank in step 2 as the positioning reference to clamp the blank. Then, the upper end face A (103), the upper surface (105), the upper end face B (108) and the annular groove A (110) are roughly milled and finely milled to obtain the rocker arm (1).

2. The aircraft engine rocker arm processing process according to claim 1, characterized in that: The clamp A comprises a base (3) and a cross-shaped fixing frame (4); a notch A (30) is provided on the base (3); circular positioning grooves are provided on the top surface of the base (3) and the bottom surface of the notch A (30); and two non-adjacent end portions of one group of the cross-shaped fixing frame (4) are connected to the base (3) via locking screws A (5).

3. The aero-engine rocker arm processing technology according to claim 2, characterized in that: The depth of the cylindrical positioning groove on the base (3) is no more than 1.8 mm.

4. The aircraft engine rocker arm processing process according to claim 2, characterized in that: The method for fixing the blank to the fixture A in step 1 is as follows: placing the blank on the base (3), supporting the lower end surface A (113) on the blank through the bottom surface of the circular positioning groove at the notch A (30), and positioning the outer cylindrical surface of one end of the blank through the circular positioning groove; supporting the lower end surface B (112) on the blank through the bottom surface of the circular positioning groove on the top surface of the base (3), and positioning the outer cylindrical surface of the other end of the blank through the circular positioning groove; connecting one group of non-adjacent two end portions of the cross-shaped fixing frame (4) to the base (3) through the locking screw A (5), and tightening the locking screw A (5) to fix the blank to the fixture A.

5. The aircraft engine rocker arm processing process according to claim 1, characterized in that: The clamp B comprises a tray (6) and a plurality of clamping mechanisms (7), wherein the plurality of clamping mechanisms (7) are evenly distributed on the tray (6) in a circular array, and the clamping mechanisms (7) are connected to the tray (6) via a plurality of positioning pins (9) and are connected to the tray (6) via a plurality of screws A (8).

6. The aircraft engine rocker arm processing process according to claim 5, characterized in that: A pull pin (65) is connected to the center of the bottom of the tray (6) via a locking screw C (66); a plurality of angular positioners (63) are evenly distributed in a circular array at the bottom of the tray (6) with the pull pin (65) as the center, and the angular positioners (63) are connected to the tray (6) via locking screws B (64).

7. The aircraft engine rocker arm processing process according to claim 5, characterized in that: The clamping mechanism (7) comprises a clamping block (71) and two locking screws D (72); a notch B (710) is provided on the top of the clamping block (71); two groups of arc-shaped positioning grooves (715) are provided on the top of the clamping block (71); a connecting line between the centers of two arc-shaped positioning grooves (715) in each group of arc-shaped positioning grooves (715) crosses the notch B (710); two elastic grooves (711) are provided side by side on the top of the clamping block (71); the two elastic grooves (711) are both perpendicular to the notch B (710) and pass through the two groups of arc-shaped positioning grooves (715) in a one-to-one correspondence; the two locking screws D (72) are coaxially arranged along the length direction of the notch B (710) and are both threadedly connected to the clamping block (71); and the two locking screws D (72) are used to narrow the two elastic grooves (711) in a one-to-one correspondence.

8. The aircraft engine rocker arm processing process according to claim 7, characterized in that: An avoidance blind hole (714) is coaxially provided on the bottom surface of the arc-shaped positioning groove (715).

9. The aircraft engine rocker arm processing process according to claim 7, characterized in that: The method for fixing the blank to the fixture B in step 2 is: supporting the upper end face A (103) and the upper end face B (108) on the blank through the bottom surface of the two arc-shaped positioning grooves (715) in the same group, and positioning the outer cylindrical surface A (115) and the outer cylindrical surface B (114) obtained by milling in step 1 on the blank through the two arc-shaped positioning grooves (715) in the group, and then tightening the locking screw D (72) close to the blank, thereby achieving the clamping of one blank; similarly, the other blank is also fixed to the fixture B.

10. The aircraft engine rocker arm processing process according to claim 1, characterized in that: The clamp C comprises a base plate (10) and two L-shaped support blocks (11) symmetrically arranged on the base plate (10), wherein a plurality of expansion mechanisms are arranged on the L-shaped support blocks (11).

11. The aircraft engine rocker arm processing process according to claim 10, characterized in that: The expansion mechanism comprises two expansion components, the lower ends of the two expansion components are correspondingly installed in two vertical mounting holes on the L-shaped support block (11), and the upper end of one of the expansion components extends from the low-step surface (1105) at the top of the L-shaped support block (11), and the upper end of the other expansion component extends from the high-step surface (1106) at the top of the L-shaped support block (11).

12. The aircraft engine rocker arm processing process according to claim 11, characterized in that: The expansion assembly comprises an inner expansion sleeve (1103), the lower end of the inner expansion sleeve (1103) is inserted into the vertical mounting hole and connected to the bottom of the L-shaped support block (11) via a locking screw E (1101), and the upper end of the inner expansion sleeve (1103) is threadedly connected with a cone-head expansion bolt (1104).

13. The aircraft engine rocker arm processing process according to claim 12, characterized in that: A limiting blind hole (1107) is radially provided on the outer circumferential surface of the inner expansion sleeve (1103); a set screw (1102) is threadedly connected to the L-shaped support block (11), and one end of the set screw (1102) extends into the limiting blind hole (1107).

14. The aircraft engine rocker arm processing process according to claim 11 or 12, characterized in that: A positioning ring (1100) is coaxially arranged at the upper end surface of the vertical mounting hole, and the positioning ring (1100) and the L-shaped support block (11) are integrally formed.

15. The aircraft engine rocker arm processing process according to claim 14, characterized in that: The method for fixing the blank to the fixture C in step 3 is as follows: the circular hole B (109) obtained by boring the blank in step 2 is inserted into the inner expansion sleeve (1103) extending from the high-step surface (1106) at the top of the L-shaped support block (11), and the circular hole A (102) obtained by boring the blank in step 2 is inserted into the inner expansion sleeve (1103) extending from the low-step surface (1105) at the top of the L-shaped support block (11), and then the blank is pressed down so that the lower end surface A (113) and the lower end surface B (112) obtained by fine milling in step 2 on the blank are respectively in contact with the upper end surface of the corresponding positioning ring (1100), and then the cone head expansion bolt (1104) is tightened to expand the upper end of the inner expansion sleeve (1103), thereby realizing the corresponding clamping of one blank to one expansion mechanism; similarly, other blanks are clamped one by one through the remaining expansion mechanisms on the fixture C.

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