Reaming clamp for low-pressure turbine disc assembly of aero-engine

Abstract

The utility model provides an aero-engine low-pressure turbine disc assembly reaming clamp, which combines the structural characteristics of a low-pressure turbine disc assembly and the machining principle of a radial drilling machine, adopts a combined adjustable design, and adopts an original bolt hole of the assembly as a positioning reference of a guide drilling tool. The problems that in the assembly reaming machining process, due to the fact that assembly bolt hole positions are not evenly distributed and arranged and an integrated drilling jig clamp cannot be adjusted, the machining hole diameter of bolt holes is out of tolerance, the holes are inclined, and the rough faces of the hole walls are not reamed are solved, the reaming precision of the low-pressure turbine disc is guaranteed, and the product machining qualification rate and quality are improved. The reaming device is convenient to clamp and high in reaming precision, the repair cost is greatly reduced, and the product delivery requirement is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft engine maintenance, and in particular relates to a reaming fixture for a low-pressure turbine disc assembly of an aircraft engine. Background Art

[0002] like Figure 4 As shown, a certain type of aircraft engine low-pressure turbine disk 19, relying on the high-precision matching of 28 bolt holes set on the outermost circle of mounting edge 22 of the disk surface and bolts, connects the first retaining ring 18 and the second retaining ring 20 into a rigid assembly. During regular maintenance, it is necessary to ream the bolt holes set on the low-pressure turbine disk assembly and re-select the bolts.

[0003] In the existing maintenance method, an integrated drilling jig is used for reaming. Due to manufacturing errors and wear and tear, the bolt holes 17 of the low-pressure turbine disk assembly will be randomly and unevenly arranged on the mounting edge 22, while the guide holes of the integrated drilling jig are evenly arranged and fixed in position. Therefore, it is difficult for the guide holes to accurately match the bolt holes 17 on the mounting edge 22, resulting in misalignment between some bolt holes 17 and the guide holes of the integrated drilling jig. Ultimately, the coaxiality of the reamer and the bolt holes 17 of the low-pressure turbine disk cannot be guaranteed, the reaming accuracy is low, and the bolt holes 17 after reaming are prone to faults such as out-of-tolerance hole diameter, hole tilt, and unreamed rough surface of the hole wall, which ultimately leads to product scrapping and affects product delivery.

[0004] Therefore, it is necessary to design a reaming fixture for the low-pressure turbine disk assembly of an aircraft engine, which is used to accurately adjust the coaxiality of the guide hole and the product bolt hole so that the low-pressure turbine disk assembly meets the reaming requirements. Utility Model Content

[0005] The utility model aims to solve the problem that the existing integrated drilling jig fixture cannot accurately adjust the coaxiality of the guide hole and the product bolt hole, and for this purpose provides an aircraft engine low-pressure turbine disk assembly reaming fixture.

[0006] To achieve the above purpose, the technical solution provided by the utility model is:

[0007] A reaming fixture for a low-pressure turbine disk assembly of an aircraft engine, which is special in that:

[0008] It includes a base assembly and a drilling tool assembly;

[0009] The base assembly includes a base, a bracket and a tension bolt;

[0010] The base is a disc, and the radius of the disc is larger than the radius of the low-pressure turbine disc surface;

[0011] The bracket is a circular ring, and the outer wall of the bracket matches the inner wall of the second retaining ring; the bottom of the bracket is fixed on the base; the circular ring surface at the top of the bracket is the base support surface, the low-pressure turbine disk assembly is arranged on the bracket, the base support surface matches the bottom end of the mounting edge, and the base support surface remains horizontal;

[0012] The height of the bracket is greater than the depth of the bolt hole; a circle of semicircular through holes corresponding to the bolt holes is provided on the outer wall of the bracket, the vertical projection of each bolt hole falls within a semicircular through hole, and the aperture of the semicircular through hole is much larger than the aperture of the bolt hole;

[0013] The tension bolt is vertically fixed at the center of the base; the length of the tension bolt is greater than the height of the bracket;

[0014] The base, bracket, and tension bolts are coaxial with the low-pressure turbine disc assembly;

[0015] The drilling tool assembly includes a fastening unit, a positioning unit and an alignment unit;

[0016] The fastening unit comprises two supports and two bushings;

[0017] The support is a cubic block, and two supports are respectively arranged at the two ends of the mounting edge; the outer wall of the support matches the inner wall of the first retaining ring; the height of the support is equal to the height of the first retaining ring; the top surface of the support is provided with a central through hole;

[0018] The bushing is fixed on the support by means of fasteners, and the tail of the bushing is interference fit in the central through hole;

[0019] The positioning unit includes a pressing plate, a nut, a drill sleeve group, a positioning pin group and a spindle group;

[0020] The pressing plate is a rectangular plate; the pressing plate does not interfere with the bushing, and both ends of the pressing plate cooperate with the supports and fix the two supports on the mounting edge;

[0021] A third light hole is provided at the center of the pressing plate, and the tightening bolt passes through the third light hole; the nut is arranged on the top of the tightening bolt and presses the pressing plate;

[0022] The drill sleeve set includes multiple pairs of drill sleeves with equal inner hole diameter variations, and each pair of drill sleeves includes two identical drill sleeves; the inner hole diameter variation range of the drill sleeves matches the required range of the reaming hole diameter of the bolt hole; the inner hole of the drill sleeve, the bushing hole and the center through hole are coaxial;

[0023] The positioning pin group includes a plurality of positioning pins with diameters of equal value, and the range of variation matches the range of variation of the inner hole diameter of the bolt hole; the positioning pin is also provided with a diameter portion with a constant diameter, which matches the bushing hole;

[0024] The mandrel group includes a plurality of pairs of mandrels with diameters of equal value, which are respectively matched with standard bolt holes within the required range of the reaming hole diameter of the bolt hole;

[0025] The alignment unit includes four fastening bushings and two fastening bolts;

[0026] The outer wall of the fastening bushing is gap-matched with the semicircular through hole of the outer wall of the bracket, and the height of the fastening bushing is slightly smaller than the height of the bracket; the top surface of the fastening bushing is provided with a first threaded blind hole;

[0027] The fastening bolt is provided with a screwing portion and a threaded portion, and the threaded portion matches the first threaded blind hole.

[0028] Further,

[0029] The fastening unit further includes two pairs of first screws;

[0030] The top surface of the support is also provided with a threaded through hole, and the top surface of the bushing is provided with a bushing hole and a first light hole; the two pairs of first screws pass through the first light hole and the threaded through hole to respectively press the two drill sleeves into the two bushings;

[0031] The tail of the bushing is interference-fitted in the central through hole, and the vertical projection of the bushing head does not fall on the limiting step;

[0032] The side wall of the support extends two limiting steps along the circumferential direction; the two ends of the pressure plate are provided with shoulders matched with the limiting steps, and the two shoulders are matched with the two limiting steps respectively.

[0033] Further,

[0034] The fastening unit further comprises two pairs of second screws;

[0035] The top surface of the support is provided with two second threaded blind holes, and the top surface of the bushing is provided with two second light holes; the two second screws pass through the second light holes and the second threaded blind holes to fix the bushing on the top of the support.

[0036] Further,

[0037] A vertical limiting rod is provided at the tail of the fastening bushing, and the limiting rod passes through the lower end of the second retaining ring;

[0038] There are four fastening bushings, which are arranged in the semicircular through holes of the bracket and are cross-symmetrical.

[0039] Further,

[0040] The hole diameter size range of the drill set is 6.0mm to 6.5mm, with a difference of 0.1mm.

[0041] Further,

[0042] The positioning pins in the positioning pin group are provided with three diameter parts in sequence, including a small diameter part, a large diameter part and a handle part; the positioning pin group includes a plurality of positioning pins with equal diameter changes in the small diameter part, and the diameter change range of the small diameter part matches the diameter change range of the bolt hole respectively; the large diameter part is arranged in the middle section of the positioning pin, and matches the inner hole clearance of the bushing; the handle part is used for holding;

[0043] The concentricity of the small diameter portion and the large diameter portion is no greater than 0.01 mm.

[0044] Further,

[0045] The handle is provided with anti-slip grooves.

[0046] Further,

[0047] The first screw is a large cylindrical head screw;

[0048] The second screw is a countersunk screw.

[0049] Further,

[0050] The outer wall of the support is provided with an arc, and the arc of the outer wall of the support is equal to the arc of the disk surface of the low-pressure turbine disk.

[0051] Further,

[0052] The head of the fastening bolt is provided with a through hole, and a pin is arranged in the through hole.

[0053] The advantages of the utility model are:

[0054] 1. The utility model combines the structural characteristics of the low-pressure turbine disk assembly and the processing principle of the radial drilling machine, adopts a combined adjustable design, and uses the original bolt holes of the assembly as the positioning reference of the guide drill, so as to solve the difficult problems of the bolt hole processing hole diameter exceeding the tolerance, the hole tilting, and the rough surface of the hole wall not being reamed due to the uneven arrangement of the bolt holes of the assembly during the assembly reaming process, thereby ensuring the reaming accuracy of the low-pressure turbine disk and improving the product processing qualification rate and product quality.

[0055] 2. The utility model has a simple structure, is easy to clamp, has high reaming accuracy, reduces the scrap rate, greatly reduces the repair cost, and meets the needs of product delivery.

[0056] 3. Compared with the integrated drilling jig fixture, the utility model can adjust the concentricity of the two holes in the hole position through the matching relationship between the small diameter part of the locating pin and the bolt hole, and the large diameter part and the bushing hole, meet the coaxiality requirements of the bolt hole and the guide hole, ensure the reaming accuracy, improve the product processing qualification rate, and ensure the maintenance quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 : Schematic diagram of the exploded structure of the base;

[0058] Figure 2 : Schematic diagram of the reaming fixture assembly;

[0059] Figure 3 : Sectional view of reaming fixture positioning and reaming;

[0060] Figure 4 : Schematic diagram of the clamping of the low-pressure turbine disc assembly.

[0061] In the figure: 1-base; 2-bracket; 3-tightening bolt; 4-third screw; 5-fourth screw; 6-nut;

[0062] 7-locating pin; 8-drill sleeve; 9-pressing plate; 10-second screw; 11-bushing; 12-support; 13-spindle; 14-fastening bushing; 15-fastening bolt; 16-first screw;

[0063] 17-bolt hole; 18-first retaining ring; 19-low-pressure turbine disk; 20-second retaining ring; 21-semicircular through hole; 22-mounting edge. DETAILED DESCRIPTION

[0064] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0065] like Figure 1 to Figure 4 A reaming fixture for a low-pressure turbine disk assembly of an aircraft engine, characterized in that:

[0066] It includes a base assembly and a drilling tool assembly;

[0067] like Figure 1 , Figure 3 and Figure 4 As shown, the base assembly includes a base 1, a bracket 2 and a tension bolt 3;

[0068] The base 1 is a disk, and the radius of the disk is larger than the radius of the low-pressure turbine disk;

[0069] The bracket 2 is a circular ring, and the outer wall of the bracket 2 matches the inner wall of the second retaining ring 20, which is used to keep the low-pressure turbine disk assembly and the base assembly coaxial; the bottom of the bracket 2 is fixed on the base 1; the circular ring surface on the top of the bracket 2 is the base support surface, the low-pressure turbine disk assembly is arranged on the bracket 2, and the base support surface matches the bottom end of the mounting edge 22;

[0070] The base support surface is kept horizontal to ensure that the surface heights of the parts installed on the bolt hole 17 are the same, to avoid the reamer from tilting when machining the hole, to avoid unnecessary interference between the low-pressure turbine disk assembly and the base assembly, and to avoid affecting the installation accuracy and reaming accuracy;

[0071] The height of the bracket 2 is greater than the depth of the bolt hole 17, ensuring the axial motion range of the reamer and preventing damage to the reamer and the base 1; a circle of semicircular through holes 21 corresponding to the bolt holes 17 is provided on the outer wall of the bracket 2, and the vertical projection of each bolt hole 17 falls within a semicircular through hole 21, and the aperture of the semicircular through hole 21 is much larger than the aperture of the bolt hole 17, ensuring that the radial motion range of the reamer is greater than the random defect range of the bolt hole 17, preventing damage to the reamer and the bracket 2;

[0072] The tension bolt 3 is vertically fixed at the center of the base 1 and is located at the center of the pressure plate 9; the length of the tension bolt 3 is greater than the height of the bracket 2 to ensure the installation space of the nut 6;

[0073] like Figure 1 As shown, in this embodiment, the base 1 is provided with 4 screw holes at the center, the base 1 is provided with 4 screw holes at the circumference, the bottom end of the tension bolt 3 is provided with 4 mounting holes, and the bottom end of the bracket 2 is provided with 4 mounting holes; the 4 third screws 4 fix the tension bolts at the center of the base, and the 4 fourth screws 5 fix the bracket 2 on the base;

[0074] The base 1, the bracket 2, the tension bolt 3 and the low-pressure turbine disc assembly are coaxial;

[0075] like Figure 2 to Figure 4 As shown, the drilling tool assembly includes a fastening unit, a positioning unit and an alignment unit;

[0076] The fastening unit comprises two pairs of first screws 16, two supports 12 and two bushings 11;

[0077] The support 12 is a cubic block, and two supports 12 are respectively arranged at both ends of the mounting edge 22; the outer wall of the support 12 matches the inner wall of the first retaining ring 18; the support 12 is fixed on the mounting edge 22 by the pressing plate 9, and is fixed by circumferential static friction with the inner wall of the first retaining ring 18 and limiting, thereby ensuring the reaming accuracy;

[0078] Preferably, the outer wall of the support 12 is provided with an arc, and the arc of the outer wall of the support 12 is equal to the arc of the disk surface of the low-pressure turbine disk 19, which assists the operator in positioning and installing when the position of the support 2 is adjusted, which is convenient and fast, and improves work efficiency; the operator only needs to adjust the support 12 in the circumferential direction of the low-pressure turbine disk 19 to adjust the coaxiality of the bushing hole and the bolt hole 17, which is convenient for the operator to align and install;

[0079] Preferably, the height of the support 12 is equal to the height of the first retaining ring 18, so that the operator can install the drill sleeve 8 easily;

[0080] The side wall of the support 12 extends two limiting steps along the circumferential direction; the top surface of the support 12 is provided with a central through hole and a threaded through hole; the tail of the bushing 11 is interference fit in the central through hole, and the bushing hole and the central through hole are coaxial; the vertical projection of the bushing head does not fall on the limiting step, ensuring that the pressure plate 9 does not interfere with the bushing 11;

[0081] The top surface of the bushing 11 is provided with a bushing hole and a first light hole, and two pairs of first screws 16 pass through the first light hole and the threaded through hole to respectively press the two drill sleeves into the two bushing holes to prevent the drill sleeves from rotating with the reamer and affecting the reaming accuracy;

[0082] Preferably, if Figure 3 , Figure 4 As shown, in order to make room for the first retaining ring 18, the first screw 16 is located on the side of the bushing close to the center of the low-pressure turbine disk 19;

[0083] The first screw 16 in this embodiment is a slotted large cylindrical head screw M6×14, so that the pressing surface of the drill sleeve is larger and the head of the first screw 16 does not interfere with the reamer;

[0084] Preferably, the fastening unit further comprises two pairs of second screws 10, the top surface of the support 12 is further provided with two second threaded blind holes, and the top surface of the bushing is further provided with two second light holes; the two pairs of second screws 10 pass through the second light holes and the second threaded blind holes to fix the two bushings on the top surfaces of the two supports 12 respectively;

[0085] The second screw 10 of this embodiment is a slotted countersunk screw M4×12 to prevent interference with the reamer;

[0086] In order to facilitate reaming, the support 12 and bushing 11 of the fastening unit have been assembled together when manufacturing the fixture to ensure coaxiality. When changing the reaming hole position, there is no need to disassemble them. Only the entire support 12 needs to be moved to save the disassembly and assembly process and improve work efficiency.

[0087] The positioning unit includes a pressing plate 9, a nut 6, a drill sleeve group, a positioning pin group and a spindle group;

[0088] The pressing plate 9 is a rectangular plate;

[0089] Both ends of the pressing plate 9 are provided with bosses that match the limiting steps. The two bosses match the two limiting steps respectively, and are used to press the two side supports 12 onto the mounting edge 22, assisting the operator to align the two symmetrical bolt holes with each other, and ensuring the integrity of the drilling tool assembly during the reaming process;

[0090] A third light hole is provided at the center of the pressing plate 9, and the tension bolt 3 passes through the third light hole; the nut 6 is arranged on the top of the tension bolt 3 and presses the pressing plate 9 to ensure that both ends of the pressing plate 9 are embedded in the limit steps;

[0091] The drill sleeve set includes multiple pairs of drill sleeves with equal inner hole diameter variations, and each pair of drill sleeves includes two identical drill sleeves; the inner hole diameter variation range of the drill sleeves matches the required range of the reaming hole diameter of the bolt hole 17; the inner hole of the drill sleeve, the bushing hole and the center through hole are coaxial to ensure the reaming accuracy of the bolt hole;

[0092] The positioning pins in the positioning pin group are provided with three diameter parts in sequence, including a small diameter part, a large diameter part and a handle part; the positioning pin group includes a plurality of positioning pins with equal diameter changes in the small diameter part, and the diameter change range of the small diameter part matches the diameter change range of the bolt hole 17 respectively; the large diameter part is arranged in the middle section of the positioning pin, and matches the clearance of the bushing hole; the handle part is used for holding; preferably, the handle part is provided with anti-slip grooves for easy holding;

[0093] In order to ensure accuracy, the concentricity of the small diameter part and the large diameter part shall not exceed 0.01mm;

[0094] The spindle group includes a plurality of pairs of spindles 13 with equal diameter variations, which are respectively matched with standard bolt holes 17 within the required range of the reaming hole diameter of the bolt hole 17. Therefore, the spindles 13 are matched with the bolt holes 17 after reaming, and are used for further positioning of the bolt holes 17 after reaming. During the reaming process of other bolt holes 17, the coaxiality of the bolt holes 17 and the integrity of the low-pressure turbine disk assembly are ensured;

[0095] When multiple pairs of mandrels 13 are used, the positions of the mandrels 13 should be continuously adjusted during the reaming of the remaining holes, so that the distribution positions of the mandrels 13 and the fastening bolts 15 are as uniform as possible, so as to better ensure the integrity of the low-pressure turbine disk assembly during the reaming process;

[0096] like Figure 4 As shown, this embodiment uses three pairs of spindles 13 for positioning the bolt holes 17;

[0097] The alignment unit includes four fastening bushings 14 and two fastening bolts 15;

[0098] The outer wall of the fastening bushing 14 is clearance-matched with the semicircular through hole 21 of the outer wall of the bracket, and the height of the fastening bushing 14 is slightly smaller than the height of the bracket to prevent mutual interference; the top surface of the fastening bushing 14 is provided with a first threaded blind hole;

[0099] Preferably, a vertical limit rod is provided at the tail of the fastening bushing 14, and the limit rod passes through the lower end of the second retaining ring 20, so as to facilitate the operator to hold and screw with the fastening bolt 15; four fastening bushings 14 are provided, which are arranged in the semicircular through hole 21 of the bracket and are symmetrical in a "cross".

[0100] The fastening bolt 15 is provided with a screwing portion and a threaded portion; the threaded portion of the fastening bolt 15 cooperates with the first threaded blind hole to firmly clamp the disc surface of the low-pressure turbine disc 19; preferably, the screwing portion is provided with a through hole, and a pin is provided in the through hole to facilitate the operator to screw;

[0101] The hole size range of the drill set of this embodiment is 6.0mm to 6.5mm, with a difference of 0.1mm;

[0102] How to use this reaming fixture:

[0103] Step 1: Measure the dislocated bolt hole 17, calculate the diameter of the standard bolt hole 17, and select tools of corresponding sizes from the drill set, dowel pin set, and spindle set;

[0104] Step 2: Adjust the horizontality of the base support surface to ensure that the surface height of the parts on the bolt hole 17 is the same to avoid tilting during hole processing;

[0105] Step 3: Assemble and install four fastening bushings 14 in the semicircular through hole 21, and then install the low-pressure turbine disk assembly on the base support surface of the bracket, ensuring that the four fastening bushings 14 are in symmetrical hole positions and are distributed in a "cross" shape;

[0106] Step 4: Figure 4 As shown, two symmetrical prepared holes are selected for reaming, and the support 12, the drill sleeve and the pressure plate 9 are installed in sequence; then two fastening bolts 15 are installed on two symmetrical fastening bushings 14, and the angle between the connecting line of the two fastening bushings 14 and the connecting line of the prepared holes is relatively large, so as to better ensure the integrity of the drill assembly during the reaming process;

[0107] Step 5: Insert the positioning pin into one of the holes, and manually adjust the concentricity of the two holes in the hole through the matching relationship between the small diameter part and the bolt hole 17, and the large diameter part and the bushing hole; after the hole adjustment is completed, use the first screw 16 to fix the drill sleeve and the bushing 11;

[0108] Step 6: Pull out the positioning pin, and use the positioning pin to adjust the other hole position to be reamed according to step 5, and use the first screw 16 to fix the drill sleeve and the bushing 11; after the two hole positions are adjusted, use the nut 6 to press the two supports 12 through the pressing plate 9;

[0109] Step 7: Use the positioning pin to check the concentricity of the two holes again to prevent the adjusted holes from moving abnormally when the pressing plate 9 is pressed. After the inspection is completed, the two symmetrical holes are reamed in turn;

[0110] Step 8: After the symmetric bolt holes 17 are reamed, the two mandrels 13 are respectively inserted into the reamed bolt holes to position the bolt holes 17;

[0111] When multiple pairs of mandrels 13 are used, the positions of the mandrels 13 need to be adjusted to ensure that the distribution positions of the mandrels 13 and the fastening bolts 15 are as uniform as possible, so as to better ensure the integrity of the drill assembly during the reaming process;

[0112] Step 9: Loosen the nut 6, remove the support 12 and the pressure plate 9; and complete the reaming of all the bolt holes 17 except the two mounting fastening bolts 15 according to the above steps 4 to 8;

[0113] Step 10: Remove the two fastening bolts 15, install them into another pair of fastening bushings 14 arranged in a "cross" shape and tighten them, and ream the remaining pair of bolt holes 17 according to the above steps 4 to 8.

[0114] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A reaming fixture for a low-pressure turbine disk assembly of an aircraft engine, characterized in that: It includes a base assembly and a drilling tool assembly; The base assembly includes a base, a bracket and a tension bolt; The base is a disc, and the radius of the disc is larger than the radius of the low-pressure turbine disc surface; The bracket is a circular ring, and the outer wall of the bracket matches the inner wall of the second retaining ring; the bottom of the bracket is fixed on the base; the circular ring surface at the top of the bracket is the base support surface, the low-pressure turbine disk assembly is arranged on the bracket, the base support surface matches the bottom end of the mounting edge, and the base support surface remains horizontal; The height of the bracket is greater than the depth of the bolt hole; a circle of semicircular through holes corresponding to the bolt holes is provided on the outer wall of the bracket, the vertical projection of each bolt hole falls within a semicircular through hole, and the aperture of the semicircular through hole is much larger than the aperture of the bolt hole; The tension bolt is vertically fixed at the center of the base; the length of the tension bolt is greater than the height of the bracket; The base, bracket, and tension bolts are coaxial with the low-pressure turbine disk assembly; The drilling tool assembly includes a fastening unit, a positioning unit and an alignment unit; The fastening unit comprises two supports and two bushings; The support is a cubic block, and two supports are respectively arranged at the two ends of the mounting edge; the outer wall of the support matches the inner wall of the first retaining ring; the height of the support is equal to the height of the first retaining ring; the top surface of the support is provided with a central through hole; The bushing is fixed on the support by means of fasteners, and the tail of the bushing is interference fit in the central through hole; The positioning unit includes a pressing plate, a nut, a drill sleeve group, a positioning pin group and a spindle group; The pressing plate is a rectangular plate; the pressing plate does not interfere with the bushing, and both ends of the pressing plate cooperate with the supports and fix the two supports on the mounting edge; A third light hole is provided at the center of the pressing plate, and the tightening bolt passes through the third light hole; the nut is arranged on the top of the tightening bolt and presses the pressing plate; The drill sleeve set includes multiple pairs of drill sleeves with equal inner hole diameter variations, and each pair of drill sleeves includes two identical drill sleeves; the inner hole diameter variation range of the drill sleeves matches the required range of the reaming hole diameter of the bolt hole; the inner hole of the drill sleeve, the bushing hole and the center through hole are coaxial; The positioning pin group includes a plurality of positioning pins with diameters of equal value, and the range of variation matches the range of variation of the inner hole diameter of the bolt hole; the positioning pin is also provided with a diameter portion with a constant diameter, which matches the bushing hole; The mandrel group includes a plurality of pairs of mandrels with diameters of equal value, which are respectively matched with standard bolt holes within the required range of the reaming hole diameter of the bolt hole; The alignment unit includes four fastening bushings and two fastening bolts; The outer wall of the fastening bushing is gap-matched with the semicircular through hole of the outer wall of the bracket, and the height of the fastening bushing is slightly smaller than the height of the bracket; the top surface of the fastening bushing is provided with a first threaded blind hole; The fastening bolt is provided with a screwing portion and a threaded portion, and the threaded portion matches the first threaded blind hole.

2. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: The fastening unit further includes two pairs of first screws; The top surface of the support is also provided with a threaded through hole, and the top surface of the bushing is provided with a bushing hole and a first light hole; the two pairs of first screws pass through the first light hole and the threaded through hole to respectively press the two drill sleeves into the two bushings; The tail of the bushing is interference-fitted in the central through hole, and the vertical projection of the bushing head does not fall on the limiting step; The side wall of the support extends two limiting steps along the circumferential direction; the two ends of the pressure plate are provided with shoulders matched with the limiting steps, and the two shoulders are matched with the two limiting steps respectively.

3. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 2, characterized in that: The fastening unit further comprises two pairs of second screws; The top surface of the support is provided with two second threaded blind holes, and the top surface of the bushing is provided with two second light holes; the two second screws pass through the second light holes and the second threaded blind holes to fix the bushing on the top of the support.

4. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: A vertical limiting rod is provided at the tail of the fastening bushing, and the limiting rod passes through the lower end of the second retaining ring; There are four fastening bushings, which are arranged in the semicircular through holes of the bracket and are cross-symmetrical.

5. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: The hole diameter size range of the drill set is 6.0mm to 6.5mm, with a difference of 0.1mm.

6. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: The positioning pins in the positioning pin group are provided with three diameter parts in sequence, including a small diameter part, a large diameter part and a handle part; the positioning pin group includes a plurality of positioning pins with equal diameter changes in the small diameter part, and the diameter change range of the small diameter part matches the diameter change range of the bolt hole respectively; the large diameter part is arranged in the middle section of the positioning pin, and matches the inner hole clearance of the bushing; the handle part is used for holding; The concentricity of the small diameter portion and the large diameter portion is no greater than 0.01 mm.

7. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 6, characterized in that: The handle is provided with anti-slip grooves.

8. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 3, characterized in that: The first screw is a large cylindrical head screw; The second screw is a countersunk screw.

9. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: The outer wall of the support is provided with an arc, and the arc of the outer wall of the support is equal to the arc of the disk surface of the low-pressure turbine disk.

10. The reaming fixture for low-pressure turbine disk assembly of an aircraft engine according to claim 1, characterized in that: The head of the fastening bolt is provided with a through hole, and a pin is arranged in the through hole.

Images