Fixture for reaming mounting edge of cartridge receiver

Abstract

The utility model provides a clamp for reaming a mounting edge of a cartridge receiver, which aims to realize gyroscopic moment application in a centering, vertical and reamer feeding process, axial force application in reamer feeding and same-rotating-direction and reverse-axial-direction actions in a reamer retracting process when a positioning pin hole is processed on the cartridge receiver. A guide sleeve used for guiding the reamer is installed in the middle of the base body, a guide hole of the guide sleeve is perpendicular to the positioning face of the clamp, the axis of the reamer is perpendicular to the machined face all the time, and the perpendicularity of the axis of the machined hole to the surface of the hole is guaranteed. The reamer feeding control assembly and the reamer withdrawing control assembly are adopted to apply axial force and torque required by reaming and withdrawing to the reamer, and the torque for reaming and the torque for withdrawing are opposite. The application of gyroscopic moment in the centering, vertical and reamer feeding process, the application of axial force in reamer feeding and the same-rotation-direction and opposite-axial-direction actions in the reamer retracting process are achieved.

Description

Technical Field

[0001] The utility model relates to a clamp for reaming holes on the mounting edge of a casing. Background Art

[0002] In the repair of aviation spare parts, in order to ensure the coaxiality of the two casings, a set of positioning pin holes on the mounting edge 17 of the casing need to be reamed. Figure 1 As shown in the figure, there are 100 holes 18 evenly distributed on the diameter of φ1485 (only part of the figure is shown, it is actually a complete rotating part), and 8 of the 100 holes 18 are locating pin holes. The holes to be reamed have a reserve in advance, and after reaming, they will become 8-φ7+0.02 locating pin holes. According to the requirements of the technical documents, when processing the locating pin holes, the two adjacent holes should be used as the positioning reference holes, and the processed holes should be in a position where the arc lengths to the two positioning reference holes are equal (usually described as "centered"), and the axis of the processed hole should be perpendicular to the plane of the installation edge. When processing, the first thing to do is to ensure that the reamed hole is "centered", and the second is to ensure that the axis of the reamed hole is vertical. If there is no fixture positioning, "centering" cannot be guaranteed, and if the reamer has no guide, the axis cannot be guaranteed to be vertical. In addition, the width of the installation edge is only 22.5mm, the diameter of the processed hole is φ6.7mm, and the distance from the hole axis to the casing wall is 12.8mm, so the fixture can only be designed with a narrow and long structure.

[0003] Due to the large diameter of the casing, reaming cannot be done on a machine tool and can only be done manually, and the reaming direction must be from bottom to top. The rotary drive of the reamer during reaming cannot use an ordinary reaming lever, and the axial load of the reamer from bottom to top is also difficult to apply due to the structural limitations of the casing, and the reamed hole is easily scratched during processing.

[0004] In view of the above characteristics, it is necessary to design a special reaming fixture to achieve "centering", verticality, application of rotational torque during reaming feed, application of axial force during feed, and co-rotational and reverse axial actions during retraction. Utility Model Content

[0005] In order to realize "centering" and verticality when machining locating pin holes on the receiver, application of rotary torque during the reamer feed process, application of axial force during the feed process, and co-rotational and reverse axial actions during the tool retraction process, the utility model provides a fixture for reaming holes on the mounting edge of the receiver, so as to ensure the coaxiality of the two receivers during the reaming operation.

[0006] The technical solution adopted by the utility model is:

[0007] A fixture for reaming holes on the mounting side of a casing, which is special in that it includes a load-bearing frame, a positioning assembly, a guide sleeve, a reamer feed control assembly and a reamer withdrawal control assembly;

[0008] The load-bearing frame is a П-shaped frame;

[0009] The positioning component is arranged at the bottom of the П-shaped frame and is used to achieve reaming positioning;

[0010] The guide sleeve is arranged at the center of the bottom of the П-shaped frame, and the axis of its guide hole is perpendicular to the machined surface on the casing; the guide sleeve is used to guide the reamer;

[0011] During the reaming operation, the reamer feed control component is installed on the two arms of the П-shaped frame. The reamer is installed between the reamer feed control component and the guide sleeve. The reamer feed control component is used to apply the axial force and torque required for reaming to the reamer;

[0012] During the reamer withdrawal operation, the reamer withdrawal control component is installed on the two arms of the П-shaped frame. The reamer is installed between the reamer withdrawal control component and the guide sleeve. The reamer withdrawal control component is used to apply the axial force and torque required for withdrawal to the reamer;

[0013] The torque directions applied by the reamer feed control component and the reamer withdrawal control component to the reamer are the same.

[0014] Further, the positioning component is composed of a cylindrical positioning pin and a diamond positioning pin, and both are installed at the bottom of the load-bearing frame, so that the machined casing is in a "one plane and two pins" positioning state.

[0015] Further, the reamer feed control component includes a reamer feed plate and a feed handle; the reamer feed plate is an integral cross beam, and its two ends are detachably connected to the ends of the two wall plates of the load-bearing frame, and the reamer feed plate is parallel to the machined surface on the casing; the feed handle is vertically installed in the middle of the reamer feed plate and is threadedly connected thereto. One end of the feed handle is machined with a first square hole along the axial direction from the end face, and the first square hole is used to cooperate with the square column of the reamer to achieve torque transmission; the other end of the feed handle has a first square head adapted to a ratchet wrench;

[0016] The reamer withdrawal control component includes a reamer withdrawal plate and a withdrawal handle; the reamer withdrawal plate is an integral cross beam, and its two ends are detachably connected to the ends of the two wall plates of the load-bearing frame, and the reamer feed plate is parallel to the machined surface on the casing; the withdrawal handle is vertically installed in the middle of the reamer withdrawal plate and is threadedly connected thereto. One end of the withdrawal handle is machined with a second square hole along the axial direction from the end face, and the second square hole is used to cooperate with the square column of the reamer to achieve torque transmission; a radial hole is provided on the side wall of the second square hole, and a withdrawal pin inserted into the radial hole can connect the withdrawal handle to the hole on the square column of the reamer to achieve axial force transmission; the other end of the withdrawal handle has a second square head adapted to a ratchet wrench;

[0017] The thread directions of the threaded holes for installing the handles on the reamer feed plate and the reamer withdrawal plate are opposite.

[0018] Further, the threaded hole for installing the feed handle on the reamer feed plate is a right-handed thread, and the threaded hole for installing the withdrawal handle on the reamer withdrawal plate is a left-handed thread.

[0019] Further, the ends of the two arm plates of the load-bearing frame have fork-shaped structures, and the first connection holes are provided on the fork-shaped structures; the two ends of the reamer feed plate are provided with second connection holes, and the two ends of the milling cutter feed plate are inserted into the fork-shaped structures, and the detachable connection between the reamer feed plate and the load-bearing frame is realized by inserting pins into the first connection holes and the second connection holes.

[0020] The connection mode between the reamer withdrawal plate and the load-bearing frame is the same as the connection mode between the reamer feed plate and the load-bearing frame.

[0021] Further, a top circle is further arranged in the first square hole of the feed handle. The top circle includes a spherical head part and a columnar part. The columnar part is embedded in the bottom of the first square hole, and the spherical head part is used to top into the central hole at the end of the reamer.

[0022] The beneficial effects of the present utility model:

[0023] 1. The present utility model uses a load-bearing frame with a П-shaped frame structure as the base body, installs a guide sleeve for guiding the reamer in the middle of the base body, and the guide hole of the guide sleeve is perpendicular to the positioning surface of the fixture, so that the axis of the reamer is always perpendicular to the machined surface, ensuring the perpendicularity of the axis of the machined hole to the hole surface; the reamer feed control component and the reamer withdrawal control component are used to apply the axial force and torque required for reaming and withdrawal to the reamer, and the torques for reaming and withdrawal are opposite. By using the present utility model in cooperation with the reamer, it can ensure that when machining the positioning pin hole on the engine case, "centering", perpendicularity, applying the rotational torque during the reamer feed process, applying the axial force during the feed process, and performing the same rotational direction and reverse axial movement during the withdrawal process can be achieved.

[0024] 2. The present utility model uses a reamer feed plate and a reamer withdrawal plate with opposite thread directions, combined with the use of a feed handle and a withdrawal handle, to realize the cutting-in and withdrawal of the reamer while keeping the reaming feed and reaming withdrawal in the same rotational direction, ensuring that the machined hole will not be scratched on the hole wall due to the reamer reversing and embedding chips, and the structure is simple and easy to operate.

[0025] 3. Threaded holes are provided in the middle of the reaming feed plate and the reamer withdrawal plate of the present utility model. During the reaming and reamer withdrawal processes, there is no need to manually apply axial loads like the ordinary fitter's reaming operation, reducing the working intensity of manual reaming.

[0026] 4. Considering that the distance between the machined hole and the casing wall panel is very close, a common reamer bar may not be able to rotate, so the present utility model designs a square head that can be matched with a ratchet wrench at the ends of both the reaming feed plate and the reamer withdrawal plate. In this way, the rapid rotation of the reamer can be achieved with the help of a ratchet wrench, improving the reaming efficiency.

[0027] 5. In the present utility model, the threaded hole in the middle of the reaming feed plate is designed as a right-handed thread, and the thread in the middle of the reamer withdrawal plate is designed as a left-handed thread, which can achieve the cutting-in and withdrawal of the reamer while keeping both the reaming feed and the reaming withdrawal as right-handed, more in line with the operating habits of most people. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the casing product (partial view of the casing assembly).

[0029] Figure 2 It is a schematic diagram of the structure of the reamer.

[0030] Figure 3 It is a three-dimensional structure schematic diagram of the fixture of the present utility model.

[0031] Figure 4 It is a sectional view of the fixture of the present utility model.

[0032] Figure 5 It is Figure 4 The sectional view taken along the line A-A in

[0033] Figure 6 It is Figure 4 The sectional view taken along the line B-B in

[0034] Figure 7 It is a schematic diagram of the structure of the load-bearing frame in the present utility model.

[0035] Figure 8 It is a schematic diagram of the structure of the guide sleeve in the present utility model.

[0036] Figure 9 It is a schematic diagram of the structure of the reaming feed plate in the present utility model.

[0037] Figure 10 It is a schematic diagram of the structure of the feed handle (right-handed thread) in the present utility model.

[0038] Figure 11 It is a schematic diagram of the structure of the withdrawal handle (left-handed thread) in the present utility model.

[0039] Figure 12 It is a schematic diagram of the structure of the top circle in the present utility model.

[0040] Figure 13 It is a schematic diagram of the structure of the cylindrical locating pin in the present utility model.

[0041] Figure 14 This is a schematic structural view of the diamond locating pin in the present utility model.

[0042] Figure 15 This is a schematic structural view of the compression nut in the present utility model.

[0043] Figure 16 This is a schematic view of the reaming feed state of the casing using the present utility model in cooperation with a reamer.

[0044] Figure 17 This is a schematic view of the reaming withdrawal state of the casing using the present utility model in cooperation with a reamer.

[0045] Reference numerals:

[0046] 1 - load-bearing frame; 101 - locating pin mounting hole; 102 - guide sleeve mounting hole; 103 - fork-shaped structure; 104 - first connection hole; 2 - guide sleeve; 3 - reamer feed plate; 301 - second connection hole; 302 - threaded hole; 4 - top circle; 5 - feed handle; 501 - first square hole; 502 - first square head; 6 - cylindrical pin locating pin; 7 - compression nut; 8 - diamond locating pin; 9 - plug pin; 10 - reamer withdrawal plate; 11 - withdrawal handle; 111 - second square hole; 112 - radial hole; 113 - second square head; 12 - retracting tool pin; 13 - hole; 14 - chip removal groove; 15 - reamer; 16 - casing; 17 - mounting edge; 18 - hole. Detailed implementation manners

[0047] The fixture for reaming on the mounting edge of the casing provided by the present utility model includes a load-bearing frame, a positioning assembly, a guide sleeve, a reamer feed control assembly, and a reamer withdrawal control assembly.

[0048] The load-bearing frame is a П-shaped frame.

[0049] The positioning assembly is arranged at the bottom of the П-shaped frame and is used to achieve reaming positioning.

[0050] The guide sleeve is arranged at the center of the bottom of the П-shaped frame, and the axis of its guide hole is perpendicular to the machined surface on the casing and is located at the center of the connection line of two adjacent holes to be reamed, that is, at a position where the arc lengths from the two adjacent holes to be reamed are equal; the guide sleeve is used to guide the reamer, and the clearance tolerance between the guide hole on the guide sleeve and the positioning part of the reamer is small enough to ensure that the reamer is reamed into the mounting edge of the casing perpendicularly, and the axis of the reamer is always perpendicular to the machined surface, ensuring the perpendicularity of the axis of the processed hole to the hole surface.

[0051] During the reaming operation, the reamer feed control assembly is installed on the two arms of the П-shaped frame. The reamer feed control assembly is used to install the reamer between it and the guide sleeve, and the reamer feed control assembly is used to apply the axial force and torque required for reaming to the reamer.

[0052] When the reamer withdrawal operation is carried out, the reamer withdrawal control component is installed on the two arms of the П-shaped frame. The reamer is installed between the reamer withdrawal control component and the guide sleeve. The reamer withdrawal control component is used to apply the axial force and torque required during the reamer withdrawal to the reamer.

[0053] The torque directions applied by the reamer feed control component and the reamer withdrawal control component to the reamer are the same.

[0054] The principle of the present utility model is as follows:

[0055] The П-shaped load-bearing frame with a frame structure is used as the base body, and the guide sleeve of the reamer is installed on the base body to ensure that the reamer is always perpendicular to the machined surface. The reamer feed control component is used to apply the axial force and torque required for reaming to the reamer, and the reamer withdrawal control component is used to apply the axial force and torque required during the reamer withdrawal to the reamer.

[0056] In order to make the purpose and advantages of the present utility model more clear and understandable, the present utility model will be further described below through embodiments.

[0057] Embodiment:

[0058] As Figure 3-6 shown, the fixture for reaming on the casing mounting edge of this embodiment includes a load-bearing frame 1, a positioning component, a guide sleeve 2, a reamer feed control component, and a reamer withdrawal control component. The positioning component is composed of a cylindrical positioning pin 6 and a diamond-shaped positioning pin 8; the reamer feed control component includes a reamer feed plate 3 and a feed handle 5; the reamer withdrawal control component includes a reamer withdrawal plate 10 and a withdrawal handle 11.

[0059] As Figure 7As shown in the figure, on both sides of the bottom of the П-shaped frame of the load-bearing frame 1, there is a positioning pin mounting hole 101 respectively for mounting a cylindrical positioning pin 6 and a diamond-shaped positioning pin 8, forming a typical "one-plane two-pin positioning" mode; in the middle of the bottom of the П-shaped frame, there is a guide sleeve mounting hole 102 for mounting the guide sleeve 2; the position of the guide sleeve mounting hole 102 is such that the axis of the guide sleeve 2 is perpendicular to the machined surface on the casing. The interval between the positioning pin mounting hole 101 and the guide sleeve mounting hole 102 matches the interval between any two of the 100 holes evenly distributed on the casing assembly, so that the positions of the two positioning pin mounting holes 101 match the two holes adjacent to the reamed hole, and the guide sleeve mounting hole 102 is located at the center of the line connecting the two holes adjacent to the reamed hole to ensure that the reamed hole is "centered". At the ends of the two arm plates of the load-bearing frame 1, there is a fork-shaped structure 103, and on the fork-shaped structure 103, there is a first connection hole 104. The fork-shaped structure 103 and the first connection hole 104 thereon are used for detachably mounting the reamer feed plate 3 and the reamer withdrawal plate 10. In other embodiments, the ends of the two arm plates of the load-bearing frame do not necessarily have to be designed as fork-shaped structures, as long as the reamer feed plate 3 and the reamer withdrawal plate 10 can be detachably mounted between the two arm plates of the load-bearing frame and are guaranteed to be parallel to the machined surface.

[0060] As Figure 8 shown, the guide sleeve 2 is a stepped shaft structure. Its small end is installed in the guide sleeve mounting hole 102 in the middle of the bottom of the load-bearing frame 1, and its large end is provided with a guide hole along the axis direction. This guide hole is used to cooperate with the reamer for guiding it, and the clearance tolerance between the guide hole and the positioning part of the reamer is φ8.5H7 / g6, ensuring that the reamer is always perpendicular to the machined surface (the mounting edge of the casing) during the reaming process. Since the cutting edge of the reamer is in the front and the guide hole is behind the cutting edge, it is "rear guiding".

[0061] As Figure 9 shown, the reamer feed plate 3 is an integral cross beam. At both ends, there are second connection holes 301, and in the middle, there is a threaded hole 302. Both ends of the reamer feed plate 3 can be inserted into the fork-shaped structures 103 at the ends of the two arm plates of the load-bearing frame 1, and the second connection holes 301 at both ends of the reamer feed plate 3 match the first connection holes 104 on the fork-shaped structures 103. By inserting pins into the first connection holes 104 and the second connection holes 301, the reamer feed plate 3 can be connected to the load-bearing frame 1. The threaded hole 302 in the middle of the reamer feed plate 3 is used for mounting the feed handle 5.

[0062] The structure of the reamer withdrawal plate 10 is similar to that of the reamer feed plate 3, except that the thread direction of the threaded hole in the middle of the reamer withdrawal plate 10 is opposite to that of the threaded hole in the middle of the reamer feed plate 3. A withdrawal handle 11 is installed in the threaded hole in the middle of the reamer withdrawal plate 10. The reason why the thread directions of the threaded holes in the middle of the reamer withdrawal plate 10 and the reamer feed plate 3 are designed to be opposite in the present utility model is to prevent the reamer from reversing and scratching the machined hole wall by embedding chips.

[0063] To conform to the operating habits of most people and make the reaming operation more convenient, in this embodiment, the threaded hole 302 in the middle of the reamer feed plate 3 is designed as a right-handed thread, and the threaded hole in the middle of the reamer withdrawal plate 10 is designed as a left-handed thread. At this time, when using a right-handed reamer, the reaming operation can be carried out by the right-handed feed handle 5, and the operation of withdrawing the reamer from the reaming can be carried out by the right-handed withdrawal handle 11.

[0064] As Figure 10 shown, one end of the feed handle 5 is machined with a first square hole 501 along the axial direction from the end face. The first square hole 501 is used to cooperate with the square column at the tail of the reamer to achieve torque transmission; a round hole for installing the top circle 4 is also opened at the bottom of the first square hole 501; the other end of the feed handle 5 has a first square head 502 that can be adapted to a ratchet wrench, which is convenient for quickly rotating the reamer by means of the ratchet wrench; a thread for matching the threaded hole 302 in the middle of the reamer feed plate 3 is provided in the middle section of the feed handle 5. As Figure 3 shown, when the reamer feed plate 3 is installed on the load-bearing frame 1, the feed handle 5 passes through the reamer feed plate 3 and is connected with it in a threaded fit. The end of the feed handle 5 with the first square hole 501 is connected with the milling cutter, and the end of the feed handle 5 with the first square head 502 is outside the entire fixture.

[0065] As Figure 11 shown, one end of the withdrawal handle 11 is machined with a second square hole 111 along the axial direction from the end face. The second square hole 111 is used to cooperate with the square column at the tail of the reamer to achieve torque transmission; at the same time, a radial hole 112 is provided on the side wall of the second square hole 111. A withdrawal pin 12 is inserted into the radial hole 112 to connect the withdrawal handle 11 with the hole 13 on the square column at the tail of the reamer (as Figure 2 shown) to achieve the transmission of axial force; the other end of the withdrawal handle 11 has a second square head 113 that can be adapted to a ratchet wrench, which is convenient for quickly rotating the reamer by means of the ratchet wrench; a thread for matching the threaded hole in the middle of the reamer withdrawal plate 10 is provided in the middle section of the withdrawal handle 11. As Figure 3As shown, when the reamer withdrawal plate 10 is installed on the load-bearing frame 1, the withdrawal handle 11 passes through the reamer withdrawal plate 10 and is threadedly connected thereto. The end of the withdrawal handle 11 having the second square hole 111 is connected to the milling cutter in a mating manner, and the end of the withdrawal handle 11 having the second square head 113 is outside the entire fixture.

[0066] As Figure 3 , 12 shown, a top circle 4 is further provided between the feed handle 5 and the reamer. The top circle 4 includes a spherical head portion 401 and a cylindrical portion 402. The cylindrical portion 402 is inserted into the round hole at the bottom of the first square hole 501 of the feed handle 5, and the spherical head portion 402 is pushed into the central hole at the end of the reamer to provide an axial force for the reamer.

[0067] As Figure 3 shown, the cylindrical locating pin 6 and the diamond locating pin 8 are respectively installed in two locating pin mounting holes 101 at the bottom of the load-bearing frame 1 for reaming positioning, so that the positioning method of the machined casing hole is in a typical "one plane and two pins" state. The structures of the cylindrical locating pin 6 and the diamond locating pin 8 are respectively as Figure 13 and 14 shown. In addition, a part of the large end heads of the cylindrical locating pin 6 and the diamond locating pin 8 is cut off to play an anti-rotation role to prevent the locating pins from rotating when the compression nut 7 is screwed.

[0068] As Figure 3 shown, there are two compression nuts 7, which are respectively installed at the tails of the cylindrical locating pin 6 and the diamond locating pin 8 and are threadedly connected thereto. By tightening the compression nuts 7, the whole utility model can be tightly fixed on the installation edge of the casing. As Figure 15 shown, a circle of bosses is designed on the outer wall of the compression nut 7 for convenient operation during manual screwing; during assembly, first manually screw it until the compression nut 7 is slightly tightened, and then tighten it with a socket wrench.

[0069] Referring to Figure 3 , 16 -17, the usage method of the reaming fixture in this embodiment:

[0070] 1) Reaming feed process

[0071] Install the reamer, the reamer feed plate, and the feed handle on the load-bearing frame, and use a ratchet wrench to rotate the reamer feed handle clockwise. The reamer rotates and axially moves at the same time until the machining of the casing installation edge is completed.

[0072] 2) Reaming withdrawal process

[0073] Keep the reamer stationary, remove the reamer feed plate and feed handle, replace them with the reamer withdrawal plate and withdrawal handle, insert a pin into the small hole of the withdrawal handle and the shank of the reamer, use a ratchet wrench to rotate the reamer withdrawal handle clockwise, and the reamer will rotate and axially move out of the casing hole while rotating, completing the process of the reamer withdrawal.

[0074] The above description is only the preferred embodiment of the present invention. Therefore, for those skilled in the art, several improvements and refinements made without departing from the principle of the present invention should also fall within the protection scope of the present invention.

Claims

1. A fixture for reaming a hole on the mounting edge of a receiver, characterized in that: It includes a load-bearing frame, a positioning assembly, a guide sleeve, a reamer feed control assembly and a reamer withdrawal control assembly; The load-bearing frame is a П-shaped frame; The positioning assembly is arranged at the bottom of the П-shaped frame to realize reaming positioning; The guide sleeve is arranged at the bottom center of the П-shaped frame, and the axis of its guide hole is perpendicular to the processed surface on the receiver; the guide sleeve is used to guide the reamer; During reaming operation, the reamer feed control assembly is installed on the two arms of the П-shaped frame, and the reamer is installed between the reamer feed control assembly and the guide sleeve. The reamer feed control assembly is used to apply the axial force and torque required for reaming to the reamer; When the reamer is withdrawn, the reamer withdrawal control assembly is installed on the two arms of the П-shaped frame, and the reamer is installed between the reamer withdrawal control assembly and the guide sleeve. The reamer withdrawal control assembly is used to apply the axial force and torque required for withdrawal to the reamer; The torques applied to the reamer by the reamer feed control assembly and the reamer exit control assembly are in the same direction.

2. The fixture for reaming a hole on the mounting edge of a casing according to claim 1, characterized in that: The positioning assembly is composed of a cylindrical positioning pin and a diamond positioning pin, and both are installed at the bottom of the load-bearing frame, so that the processed casing is in a "one side, two pins" positioning state.

3. The fixture for reaming a hole on the mounting edge of a casing according to claim 2, characterized in that: The reamer feed control assembly includes a reamer feed plate and a feed handle; the reamer feed plate is a beam as a whole, and its two ends are detachably connected to the ends of the two wall plates of the load-bearing frame, and the reamer feed plate is parallel to the processed surface on the receiver; the feed handle is vertically installed in the middle of the reamer feed plate and is threadedly connected to it, and one end of the feed handle is processed with a first square hole along the axial direction from the end face, and the first square hole is used to cooperate with the square column of the reamer to realize torque transmission; the other end of the feed handle has a first square head adapted to the ratchet wrench; The reamer withdrawal control assembly includes a reamer withdrawal plate and a withdrawal handle; the reamer withdrawal plate is a beam as a whole, and its two ends are detachably connected to the ends of the two wall plates of the load-bearing frame, and the reamer feed plate is parallel to the processed surface on the receiver; the withdrawal handle is vertically installed in the middle of the reamer withdrawal plate and is threadedly connected to it, and one end of the withdrawal handle is processed with a second square hole along the axial direction from the end face, and the second square hole is used to cooperate with the square column of the reamer to achieve torque transmission; a radial hole is provided on the side wall of the second square hole, and a tool withdrawal pin is inserted into the radial hole to connect the withdrawal handle with the hole on the square column of the reamer to achieve axial force transmission; the other end of the withdrawal handle has a second square head adapted to the ratchet wrench; The threaded holes for mounting the handle on the reamer feed plate and the reamer exit plate have opposite threads.

4. The fixture for reaming a hole on the mounting edge of a casing according to claim 3, characterized in that: The threaded hole on the reamer feed plate for mounting the feed handle is a right-hand thread, and the threaded hole on the reamer exit plate for mounting the exit handle is a left-hand thread.

5. The fixture for reaming a hole on the mounting edge of a casing according to claim 3 or 4, characterized in that: The two arm plate ends of the load-bearing frame have a fork-shaped structure, and a first connecting hole is provided on the fork-shaped structure; the two ends of the reamer feed plate are provided with second connecting holes, and the two ends of the milling cutter feed plate are inserted into the fork-shaped structure, and the detachable connection between the reamer feed plate and the load-bearing frame is realized by inserting a latch into the first connecting hole and the second connecting hole; The connection mode between the reamer exit plate and the load-bearing frame is the same as the connection mode between the reamer feed plate and the load-bearing frame.

6. The fixture for reaming a hole on the mounting edge of a casing according to claim 5, characterized in that: A top circle is also arranged in the first square hole of the feed handle, the top circle comprises a ball head and a columnar portion, the columnar portion is embedded in the bottom of the first square hole, and the ball head is used to push into the center hole of the end of the reamer.

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