Positioning fixture device for milling joint surface of cartridge receiver

Abstract

The utility model discloses a positioning fixture device for milling a joint surface of a casing, which comprises a fixture base, a fixture connecting plate is arranged on the fixture base, and a fixture positioning block, a first fixture positioning module and a second fixture positioning module are mounted on the fixture connecting plate. The first clamp positioning module comprises a first module first stand column, a first module second stand column, a first module third stand column, a first module fourth stand column, a first clamp connecting block, a first module second connecting block and a first module third connecting block. The second clamp positioning module comprises a first stand column of the second module, a second stand column of the second module, a third stand column of the second module, a fourth stand column of the second module, a first connecting block of the second module and a second connecting block of the second module, and a case part to be machined is installed between the first clamp positioning module and the second clamp positioning module; and the clamp positioning block is used for positioning and clamping.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing processing, and in particular relates to a positioning fixture device used for milling processing of a casing joint surface. Background Art

[0002] With the rapid development of my country's aviation industry, the production and processing of engine casings has played a significant role in the production and processing quality of the entire engine, and determines the performance and level of the engine. In the production and processing of casing parts, it is often necessary to split the casing parts into two symmetrical parts, process them separately, and then connect them. In the process of processing a single casing part, the processing quality of the joint surface of the casing parts becomes particularly important, which directly determines the overall performance of the casing parts when the casing is combined.

[0003] The existing processing of the mating surfaces of receiver parts is done by milling, which can improve the processing accuracy. However, before milling the mating surfaces of receiver parts, the receiver needs to be positioned and clamped so that the receiver will not shake during the processing, so the corresponding fixture becomes more and more important. The quality of the clamping of the receiver parts by the fixture determines the quality of the subsequent milling of the receiver parts. In the existing fixtures for clamping and positioning receiver parts, due to the problem of clamping force, the receiver parts are often damaged due to excessive clamping force or unstable due to insufficient clamping force. At the same time, since the receiver parts are arc structures, the inner and outer parts of the receiver parts cannot be accurately positioned, which causes unstable clamping of the receiver parts and affects the processing accuracy of the mating surfaces of the receiver parts during milling. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems and to provide a positioning fixture device for the milling of the casing joint surface which has a simple structure and is easy to operate, and which realizes the positioning and clamping of the inner and outer surfaces of the parts by installing a fixture positioning block on a fixture connecting plate, a fixture positioning first module and a fixture positioning second module, thereby improving the clamping and positioning accuracy.

[0005] To solve the above technical problems, the technical solution of the utility model is: a positioning fixture device for casing joint surface milling processing, including a fixture base, a fixture connecting plate is provided on the fixture base, a fixture positioning block, a fixture positioning first module and a fixture positioning second module are installed on the fixture connecting plate, the fixture positioning first module includes a first column of the first module, a second column of the first module, a third column of the first module, a fourth column of the first module, a fixture first connecting block, a first module second connecting block and a first module third connecting block, the first column of the first module and the first module second column are installed in parallel on the fixture connecting plate, the fixture first connecting block is located at the top of the first column of the first module and the second column of the first module, the first module second connecting block is located on the fixture first connecting block, the first module third column passes through the fixture first connecting block and the first module second connecting block and is connected to the first column of the first module, the first module fourth column passes through the fixture first connecting block and the first module second The connecting block is connected to the second column of the first module, and the third connecting block of the first module is located at the top of the third column of the first module and the fourth column of the first module; the fixture positioning second module includes the first column of the second module, the second column of the second module, the third column of the second module, the fourth column of the second module, the first connecting block of the second module and the second connecting block of the second module, the first column of the second module and the second column of the second module are installed in parallel on the fixture connecting plate, the first connecting block of the second module is located at the top of the first column of the second module and the second column of the second module, the third column of the second module passes through the first connecting block of the second module and is connected to the first column of the second module, the fourth column of the second module passes through the first connecting block of the second module and is connected to the second column of the second module, and the second connecting block of the second module is located at the top of the third column of the second module and the fourth column of the second module; the casing parts to be processed are installed between the fixture positioning first module and the fixture positioning second module, and are positioned and clamped by the fixture positioning block.

[0006] Preferably, the clamp base includes a first base plate, a second base plate and a base connecting block, the first base plate and the second base plate are both circular ring structures and are coaxial, the first base plate and the second base plate are connected through the base connecting block, the clamp connecting plate and the second base plate are connected through bolts, and the first base plate is provided with a first base plate groove and a first base plate through hole, and the first base plate through hole is located in the first base plate groove.

[0007] Preferably, a base second plate groove and a base second plate through hole are provided on the end surface of the base second plate, and the base second plate through hole is located in the base second plate groove.

[0008] Preferably, the cross-section of the base connecting block is a trapezoidal structure, and a first base connecting block hole and a second base connecting block hole are provided on the base connecting block, and both the first base connecting block hole and the second base connecting block hole are through-hole structures.

[0009] Preferably, the fixture connecting plate is provided with a first connecting plate hole, a second connecting plate hole, a third connecting plate hole, a fourth connecting plate hole, a fifth connecting plate hole, a sixth connecting plate hole and a connecting plate groove, the first connecting plate hole and the fourth connecting plate hole are countersunk through holes, the second connecting plate hole is a threaded through hole, the third connecting plate hole is a threaded hole, the fifth connecting plate hole is a threaded through hole, the sixth connecting plate hole is a threaded hole, the connecting plate groove is a semicircular structure, and the bottom of the part to be processed is located in the connecting plate groove.

[0010] Preferably, the clamp positioning block is a rectangular structure, the end cross-section of the clamp positioning block is trapezoidal, and the clamp positioning block is provided with a first clamp positioning block hole and a second clamp positioning block hole. The first clamp positioning block hole and the second clamp positioning block hole are both through hole structures, and the second clamp positioning block hole is a waist-shaped hole structure.

[0011] Preferably, the first column is a cylindrical structure, the end cross-section of the first column is a regular hexagonal structure, and is concave to form the first hole of the first column, the first hole of the first column is an internal threaded hole structure, the other end of the first column protrudes outward to form the first column connecting rod, the first column connecting rod is a threaded rod structure, and the first column, the second column of the clamp, the third column of the clamp and the fourth column of the clamp have the same structure.

[0012] Preferably, the first connecting block of the clamp is a rectangular block structure, and the two ends of the first connecting block of the clamp are arc structures. The two ends of the first connecting block of the clamp are sunken to form a first connecting block groove of the clamp. A first connecting block groove through hole is provided in the first connecting block groove of the clamp. A first connecting block connecting hole is provided on the first connecting block of the clamp. The first connecting block connecting hole of the clamp is a threaded hole structure. The first connecting block of the clamp, the second connecting block of the clamp and the third connecting block of the clamp have the same structure.

[0013] Preferably, the first connecting block of the second module is a rectangular structure, the two ends of the first connecting block of the second module are arc structures, the first connecting block of the second module is provided with a first hole of the first connecting block of the second module and a second hole of the first connecting block of the second module, the first hole of the first connecting block of the second module is a through hole structure, and the second hole of the first connecting block of the second module is a threaded hole structure.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model provides a positioning fixture device for the milling of the casing joint surface, which has a simple structure and is easy to operate. The inner and outer surfaces of the casing parts are positioned and clamped by installing a fixture positioning block on the fixture connecting plate, the first fixture positioning module and the second fixture positioning module, thereby improving the clamping and positioning accuracy.

[0016] 2. The utility model can install the fixture positioning blocks at different positions through the fixture positioning first module and the fixture positioning second module, thereby completing the accurate positioning of the receiver parts to be processed. Compared with the traditional equipment for clamping the receiver parts, which can only clamp at a single fixed position, the utility model has stronger flexibility and practicality, and is particularly suitable for the production and processing environment of precision parts processing with high processing accuracy requirements.

[0017] 3. The utility model can complete the positioning of the inner and outer surfaces of the parts by using the fixture positioning block, and the groove structure set on the fixture connecting plate can position the bottom of the receiver part. Therefore, the clamping and positioning of the receiver part is more stable, and no shaking will occur during the milling process of the joint surface, which has good stability and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a positioning fixture device used for milling the casing joint surface of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model after the parts are installed;

[0020] Figure 3 It is a schematic diagram of the top view of the fixture base of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the fixture base in a bottom view of the utility model;

[0022] Figure 5 It is a lateral structural schematic diagram of the fixture base of the utility model;

[0023] Figure 6 It is a structural schematic diagram of the connecting plate of the clamp of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the positioning block of the fixture of the utility model;

[0025] Figure 8 This is a structural schematic diagram of the first module of the fixture positioning of the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the first column of the first module of the utility model;

[0027] Fig.10 It is a structural schematic diagram of the first connecting block of the clamp of the utility model;

[0028] Fig.11 This is a structural schematic diagram of the second module of the fixture positioning of the utility model;

[0029] Fig.12It is a structural schematic diagram of the first connecting block of the second module of the utility model.

[0030] Explanation of the reference numerals: 1. fixture base; 2. fixture connecting plate; 3. fixture positioning block; 4. fixture positioning first module; 5. fixture positioning second module; 11. first plate of base; 12. second plate of base; 13. base connecting block; 21. first hole of connecting plate; 22. second hole of connecting plate; 23. third hole of connecting plate; 24. fourth hole of connecting plate; 25. fifth hole of connecting plate; 26. sixth hole of connecting plate; 27. groove of connecting plate; 31. first hole of fixture positioning block; 32. second hole of fixture positioning block; 41. first column of first module; 42. second column of first module; 43. third column of first module; 44. fourth column of first module; 45. first connecting block of fixture; 46. second connecting block of first module; 47. third connecting block of first module Connecting block; 51, first column of second module; 52, second column of second module; 53, third column of second module; 54, fourth column of second module; 55, first connecting block of second module; 56, second connecting block of second module; 111, first plate groove of base; 112, first plate through hole of base; 121, second plate groove of base; 122, second plate through hole of base; 131, first hole of base connecting block; 132, second hole of base connecting block; 411, first hole of first column; 412, connecting rod of first column; 451, groove of first connecting block of clamp; 452, through hole of groove of first connecting block of clamp; 453, connecting hole of first connecting block of clamp; 551, first hole of first connecting block of second module; 552, second hole of first connecting block of second module. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] like Figures 1 to 12As shown, the utility model provides a positioning fixture device for casing joint surface milling, including a fixture base 1, a fixture connecting plate 2 is provided on the fixture base 1, and a fixture positioning block 3, a fixture positioning first module 4 and a fixture positioning second module 5 are installed on the fixture connecting plate 2. The fixture positioning first module 4 includes a first module first column 41, a first module second column 42, a first module third column 43, a first module fourth column 44, a fixture first connection block 45, a first module second connection block 46 and a first module third connection block 47, and the first module first column 41 and the first module second column 42 are installed in parallel on the fixture connecting plate 2. The fixture first connection block 45 is located at the top of the first module first column 41 and the first module second column 42, and the first module second connection block 46 is located on the fixture first connection block 45. The first module third column 43 passes through the fixture first connection block 45 and the first module second connection block 46 and is connected to the first module first column 41. The fourth column 44 of the first module passes through the first connection block 45 of the clamp and the second connection block 46 of the first module and is connected to the second column 42 of the first module. The third connection block 47 of the first module is located at the top of the third column 43 of the first module and the fourth column 44 of the first module. The second module 5 of the clamp positioning includes the first column 51 of the second module, the second column 52 of the second module, the third column 53 of the second module, the fourth column 54 of the second module, the first connection block 55 of the second module and the second connection block 56 of the second module. The first column 51 of the second module and the second column 52 of the second module are installed in parallel on the clamp connection plate 2. The first connection block 55 of the second module is located at the top of the first column 51 of the second module and the second column 52 of the second module. The third column 53 of the second module passes through the first connection block 55 of the second module and is connected to the first column 51 of the second module. The fourth column 54 of the second module passes through the first connection block 55 of the second module and is connected to the second column 52 of the second module. The second connection block 56 of the second module is located at the top of the third column 53 of the second module and the fourth column 54 of the second module. The casing part to be processed is installed between the first fixture positioning module 4 and the second fixture positioning module 5, and is positioned and clamped by the fixture positioning block 3.

[0033] In this embodiment, the part to be processed is a casing part, the cross section of the casing is semicircular, and two semicircular casing parts constitute a rotating body structure. The junction of the two casing parts is a junction surface, and the junction surface is milled. By positioning the bottom and the periphery of the casing part, the processing accuracy of the casing milling is improved.

[0034] like Figures 3 to 5As shown, the clamp base 1 includes a first base plate 11, a second base plate 12 and a base connecting block 13, the first base plate 11 and the second base plate 12 are both circular ring structures and coaxial, the first base plate 11 and the second base plate 12 are connected by the base connecting block 13, the clamp connecting plate 2 is connected to the second base plate 12 by bolts, the first base plate 11 is provided with a first base plate groove 111 and a first base plate through hole 112, the first base plate through hole 112 is located in the first base plate groove 111.

[0035] A base second plate groove 121 and a base second plate through hole 122 are provided on the end surface of the base second plate 12 , and the base second plate through hole 122 is located in the base second plate groove 121 .

[0036] The cross section of the base connection block 13 is a trapezoidal structure, and the base connection block 13 is provided with a first base connection block hole 131 and a second base connection block hole 132, both of which are through-hole structures, and the first base connection block hole 131 and the second base connection block hole 132 can reduce the weight of the base connection block 13. The base connection blocks 13 are arranged and distributed in a circular shape between the first base plate 11 and the second base plate 12.

[0037] In this embodiment, two base second plate through holes 122 are provided in each base second plate groove 121, and the base second plate grooves 121 are distributed in a circumferential array on the end surface of the base second plate 12. Bolts pass through the fixture connecting plate 2 and are threadedly connected to the base second plate through holes 122, thereby fixing the fixture connecting plate 2 to the fixture base 1. The fixture base 1 is fixedly connected to existing machine tools and the like. For example, the base first plate 11 and the base second plate 12 are sleeved on the rotating shaft of an existing machine tool and fixedly connected, thereby connecting the parts to the machine tool.

[0038] like Figure 6 As shown, the fixture connecting plate 2 is provided with a first connecting plate hole 21, a second connecting plate hole 22, a third connecting plate hole 23, a fourth connecting plate hole 24, a fifth connecting plate hole 25, a sixth connecting plate hole 26 and a connecting plate groove 27, wherein the first connecting plate hole 21 and the fourth connecting plate hole 24 are countersunk through holes, the second connecting plate hole 22 is a threaded through hole, the third connecting plate hole 23 is a threaded hole, the fifth connecting plate hole 25 is a threaded through hole, the sixth connecting plate hole 26 is a threaded hole, and the connecting plate groove 27 is a semicircular structure, and the bottom of the part to be processed is located in the connecting plate groove 27.

[0039] In this embodiment, the connecting plate groove 27 divides the connecting plate first hole 21, the connecting plate second hole 22, the connecting plate third hole 23, the connecting plate fourth hole 24, the connecting plate fifth hole 25, the connecting plate sixth hole 26 and the connecting plate groove 27 into two parts. Among them, the connecting plate first hole 21, the connecting plate second hole 22, the connecting plate third hole 23 are on one side of the connecting plate groove 27, and the remaining holes are on the other side of the connecting plate groove 27. The number and position of the connecting plate first hole 21, the connecting plate second hole 22, the connecting plate third hole 23, the connecting plate fourth hole 24, the connecting plate fifth hole 25, and the connecting plate sixth hole 26 can be set according to actual use requirements.

[0040] The bolts pass through the first hole 21 and the fourth hole 24 of the connecting plate and are connected to the corresponding second plate through hole 122 of the base, thereby fixing the fixture connecting plate 2 to the fixture base 1. The bottom of the fixture positioning first module 4 is threadedly connected to the second hole 22 of the connecting plate, and the bottom of the fixture positioning second module 5 is threadedly connected to the fifth hole 25 of the connecting plate.

[0041] The bolt passes through the fixture positioning block 3 and is connected to the third hole 23 of the connecting plate or the sixth hole 26 of the connecting plate, thereby installing the fixture positioning block 3. The number of the fixture positioning blocks 3 is determined according to actual use needs. By installing the fixture positioning blocks 3 on the third hole 23 of the connecting plate and the sixth hole 26 of the connecting plate, the inner and outer surfaces of the bottom of the part can be positioned.

[0042] like Figure 7 As shown, the clamp positioning block 3 is a rectangular structure, the end cross-section of the clamp positioning block 3 is trapezoidal, and the clamp positioning block 3 is provided with a clamp positioning block first hole 31 and a clamp positioning block second hole 32. The clamp positioning block first hole 31 and the clamp positioning block second hole 32 are both through hole structures, and the clamp positioning block second hole 32 is a waist-shaped hole structure.

[0043] The end of the fixture positioning block 3 abuts against the part, and the bolt passes through the second hole 32 of the fixture positioning block and is threadedly connected to the third hole 23 of the connecting plate or the sixth hole 26 of the connecting plate, thereby fixing the fixture positioning blocks 3 at different positions on the fixture connecting plate 2.

[0044] like Figures 8 to 10 As shown, the first column 41 is a cylindrical structure, the end cross-section of the first column 41 is a regular hexagonal structure, and is concave to form a first column first hole 411, the first column first hole 411 is an internal threaded hole structure, the other end of the first column 41 protrudes outward to form a first column connecting rod 412, the first column connecting rod 412 is a threaded rod structure, the first column 41, the second column 42 of the clamp, the third column 43 of the clamp and the fourth column 44 of the clamp have the same structure.

[0045] In this embodiment, the first column 41 and the second column 42 of the clamp are threadedly connected to the corresponding second holes 22 of the connecting plate.

[0046] like Fig.10 As shown, the first connecting block 45 of the clamp is a rectangular block structure, and the two ends of the first connecting block 45 of the clamp are arc structures. The two ends of the first connecting block 45 of the clamp are sunken to form a first connecting block groove 451 of the clamp, and the first connecting block groove 451 of the clamp is provided with a first connecting block groove through hole 452 of the clamp, and the first connecting block connecting hole 453 of the clamp is provided on the first connecting block 45, and the first connecting block connecting hole 453 of the clamp is a threaded hole structure. The first connecting block 45 of the clamp, the second connecting block 46 of the clamp and the third connecting block 47 of the clamp have the same structure.

[0047] The first clamp connection block 45 and the second clamp connection block 46 are arranged symmetrically, and the second clamp connection block 46 and the third clamp connection block 47 are arranged in parallel.

[0048] The threaded ends of the third column 43 and the fourth column 44 of the clamp respectively pass through the corresponding groove through holes 452 of the first connecting block of the clamp and are connected to the corresponding first column 41 and the second column 42 of the clamp.

[0049] like Fig.12 As shown, the first connecting block 55 of the second module is a rectangular structure, and the two ends of the first connecting block 55 of the second module are arc structures. The first connecting block 55 of the second module is provided with a first hole 551 of the first connecting block of the second module and a second hole 552 of the first connecting block of the second module. The first hole 551 of the first connecting block of the second module is a through hole structure, and the second hole 552 of the first connecting block of the second module is a threaded hole structure.

[0050] In actual use, the fixture positioning block 3 can be appropriately installed in the fixture first connecting block connecting hole 453 and the second module first connecting block second hole 552 according to use needs, thereby completing the clamping and positioning of other parts of the part.

[0051] In actual use, the receiver part to be processed is installed between the first fixture positioning module 4 and the second fixture positioning module 5, and the fixture positioning blocks 3 installed at different positions are in contact with the inner and outer surfaces of the parts to complete the clamping and positioning of the receiver part. Then, the joint surface of the receiver part is milled by the existing milling cutter.

[0052] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A positioning fixture device for casing joint surface milling, characterized in that: The invention comprises a fixture base (1), the fixture base (1) is provided with a fixture connecting plate (2), the fixture connecting plate (2) is provided with a fixture positioning block (3), a fixture positioning first module (4) and a fixture positioning second module (5), the fixture positioning first module (4) comprises a first module first column (41), a first module second column (42), a first module third column (43), a first module fourth column (44), a fixture first connecting block (45), a first module second connecting block (46) and a first module third connecting block (47), the first module first column (41) and the first module second column (42) are provided. ) are installed in parallel on the fixture connecting plate (2), the first connecting block (45) of the fixture is located at the top of the first column (41) of the first module and the second column (42) of the first module, the second connecting block (46) of the first module is located on the first connecting block (45) of the fixture, the third column (43) of the first module passes through the first connecting block (45) of the fixture and the second connecting block (46) of the first module and is connected to the first column (41) of the first module, the fourth column (44) of the first module passes through the first connecting block (45) of the fixture and the second connecting block (46) of the first module and is connected to the second column (42) of the first module, The first module third connection block (47) is located at the top of the first module third column (43) and the first module fourth column (44); the fixture positioning the second module (5) includes the second module first column (51), the second module second column (52), the second module third column (53), the second module fourth column (54), the second module first connection block (55) and the second module second connection block (56); the second module first column (51) and the second module second column (52) are installed in parallel on the fixture connecting plate (2); the second module first connection block (55) is located at the second module first column (5 1) and the top of the second column (52) of the second module, the third column (53) of the second module passes through the first connecting block (55) of the second module and is connected to the first column (51) of the second module, the fourth column (54) of the second module passes through the first connecting block (55) of the second module and is connected to the second column (52) of the second module, and the second connecting block (56) of the second module is located at the top of the third column (53) of the second module and the top of the fourth column (54) of the second module; the casing part to be processed is installed between the first fixture positioning module (4) and the second fixture positioning module (5), and is positioned and clamped by the fixture positioning block (3).

2. A positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The clamp base (1) comprises a first base plate (11), a second base plate (12) and a base connecting block (13); the first base plate (11) and the second base plate (12) are both circular ring structures and coaxial; the first base plate (11) and the second base plate (12) are connected via the base connecting block (13); the clamp connecting plate (2) and the second base plate (12) are connected via bolts; a first base plate groove (111) and a first base plate through hole (112) are provided on the first base plate (11); the first base plate through hole (112) is located in the first base plate groove (111).

3. A positioning fixture device for casing joint surface milling according to claim 2, characterized in that: A base second plate groove (121) and a base second plate through hole (122) are provided on the end surface of the base second plate, and the base second plate through hole (122) is located in the base second plate groove (121).

4. A positioning fixture device for casing joint surface milling according to claim 2, characterized in that: The cross section of the base connection block (13) is a trapezoidal structure. The base connection block (13) is provided with a first base connection block hole (131) and a second base connection block hole (132). Both the first base connection block hole (131) and the second base connection block hole (132) are through-hole structures.

5. A positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The fixture connecting plate (2) is provided with a first connecting plate hole (21), a second connecting plate hole (22), a third connecting plate hole (23), a fourth connecting plate hole (24), a fifth connecting plate hole (25), a sixth connecting plate hole (26) and a connecting plate groove (27); the first connecting plate hole (21) and the fourth connecting plate hole (24) are countersunk through holes, the second connecting plate hole (22) is a threaded through hole, the third connecting plate hole (23) is a threaded hole, the fifth connecting plate hole (25) is a threaded through hole, the sixth connecting plate hole (26) is a threaded hole, and the connecting plate groove (27) is a semicircular structure, and the bottom of the part to be processed is located in the connecting plate groove (27).

6. A positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The clamp positioning block (3) is a rectangular parallelepiped structure, the end section of the clamp positioning block (3) is a trapezoidal shape, and the clamp positioning block (3) is provided with a first clamp positioning block hole (31) and a second clamp positioning block hole (32), the first clamp positioning block hole (31) and the second clamp positioning block hole (32) are both through-hole structures, and the second clamp positioning block hole (32) is a waist-shaped hole structure.

7. A positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The first column (41) is a cylindrical structure, the end section of the first column (41) is a regular hexagonal structure, and is concave to form a first column first hole (411), the first column first hole (411) is an internal threaded hole structure, the other end of the first column (41) protrudes outward to form a first column connecting rod (412), the first column connecting rod (412) is a threaded rod structure, the first column (41), the second column (42) of the clamp, the third column (43) of the clamp and the fourth column (44) of the clamp have the same structure.

8. The positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The first connecting block (45) of the clamp is a rectangular block structure, and the two ends of the first connecting block (45) of the clamp are arc structures. The two ends of the first connecting block (45) of the clamp are sunken to form a first connecting block groove (451) of the clamp. A first connecting block groove through hole (452) of the clamp is provided in the first connecting block groove (451). The first connecting block (45) of the clamp is provided with a first connecting block connecting hole (453) of the clamp. The first connecting block connecting hole (453) of the clamp is a threaded hole structure. The first connecting block (45), the second connecting block (46) of the clamp and the third connecting block (47) of the clamp have the same structure.

9. A positioning fixture device for casing joint surface milling according to claim 1, characterized in that: The second module first connection block (55) is a rectangular parallelepiped structure, and both ends of the second module first connection block (55) are arc structures. The second module first connection block (55) is provided with a second module first connection block first hole (551) and a second module first connection block second hole (552). The second module first connection block first hole (551) is a through hole structure, and the second module first connection block second hole (552) is a threaded hole structure.

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