Clamping method for milling mounting plane of welding special-shaped part

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a clamping method for welding a milling mounting plane of a special-shaped part. A clamp is adopted to clamp the welded special-shaped part, and the clamp comprises a base and a fastening screw; a support is installed on the top face of the base, a bent part is arranged on the upper portion of the support, a hollow positioning sleeve is inserted into a through hole of the bent part, and the upper half section of the hollow positioning sleeve is inserted into a positioning hole of a welding special-shaped piece. A first gasket is arranged on the lower surface of the bent part, a fastening screw sequentially penetrates through the first gasket and a center hole of the hollow positioning sleeve and then is screwed in a process threaded hole of the welding special-shaped part, the fastening screw is tightened to tension the welding special-shaped part, and the lower end face of a connecting nozzle of the welding special-shaped part abuts against the bent part of the support; an angular positioning seat is mounted on the top surface of the base, and a U-shaped groove is formed in the angular positioning seat; an angular positioning pin is inserted into the bolt hole of the welding special-shaped piece; and the lower end of the angular positioning pin is clamped in the U-shaped groove.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengine manufacturing, and in particular to a clamping method for milling and machining an installation plane of a welding special-shaped part. Background Art

[0002] In the field of aviation manufacturing, in order to achieve specific functions, some welded special-shaped parts with complex shapes are often used. Some welded special-shaped parts need to be machined after assembly welding. The biggest challenge in the machining process of welded special-shaped parts is how to achieve reliable and stable clamping.

[0003] Combination Figure 1 , which is a partial structural cross-sectional view of a welding shaped part 100, the welding shaped part 100 comprises a shell 101, an edge plate 102 is welded to the shell 101, bolt mounting columns 103 are inserted at the four corners of the edge plate 102, and the bolt mounting columns 103 are welded to the edge plate 102. The bottom of the welding shaped part 100 is provided with a nozzle 104 and an angular positioning block 105, a process threaded hole 104b and a positioning hole 104a with a diameter of φD are provided at the center of the nozzle 104, and a pin hole 105a with a diameter of φE is provided on the angular positioning block 105 for angular positioning.

[0004] In the above-mentioned welded special-shaped part 100 , the top surface M of the edge plate 102 is the installation plane, which needs to be milled, and at the same time, the welding part between the bolt installation column 103 and the edge plate 102 is milled flat.

[0005] Since the above-mentioned welding special-shaped part 100 is a special-shaped structural part, how to perform reliable and stable clamping during milling of the installation plane is an urgent problem to be solved. Summary of the invention

[0006] The main purpose of the present invention is to provide a clamping method for the milling and machining installation plane of welding special-shaped parts, aiming to solve the above-mentioned technical problems.

[0007] To achieve the above-mentioned purpose, the present invention proposes a clamping method for the milling and processing installation plane of welding special-shaped parts, and a clamp is used to clamp the welding special-shaped parts. The clamp comprises a base and a fastening screw; a support is installed on the top surface of the base, the upper part of the support is set as a bending part, and a hollow positioning sleeve is inserted in the through hole of the bending part, and the upper half of the hollow positioning sleeve is inserted in the positioning hole of the welding special-shaped part; a first washer is arranged on the lower surface of the bending part, and the fastening screw passes through the first washer and the center hole of the hollow positioning sleeve in sequence and then is screwed into the process threaded hole of the welding special-shaped part, and the fastening screw is tightened to tighten the welding special-shaped part so that the lower end surface of the nozzle of the welding special-shaped part is against the bending part of the support; an angular positioning seat is installed on the top surface of the base; a U-shaped groove is arranged on the angular positioning seat; an angular positioning pin is inserted in the pin hole of the welding special-shaped part; the lower end of the angular positioning pin is stuck in the U-shaped groove of the angular positioning seat.

[0008] Preferably, a plurality of two clamping block mounting seats are installed on the top surface of the base, a first clamping block is slidably mounted on the top of one of the clamping block mounting seats, and a second clamping block is slidably mounted on the top of the other clamping block mounting seat; the first clamping block and the second clamping block respectively include a screw mounting portion and a cantilever plate integrally formed on the screw mounting portion; a protruding block is integrally formed on the side of the cantilever plate; a lead screw is commonly mounted on the screw mounting portions of the first clamping block and the second clamping block; the lead screw is provided with a first screw segment and a second screw segment with opposite thread rotation directions; the first screw segment and the second screw segment respectively cooperate with the threaded holes on the screw mounting portions on the first clamping block and the second clamping block; when clamping the welding special-shaped part, the lead screw is rotated to drive the first clamping block and the second clamping block to move closer to each other, so that the protruding blocks on the first clamping block and the second clamping block are clamped on the shell of the welding special-shaped part.

[0009] Preferably, a support plate is installed on the cantilever plate through a rotating shaft; when the welding special-shaped part is clamped, after the screw drives the first clamping block and the second clamping block to move closer to each other and clamp the shell of the welding special-shaped part, the support plate is rotated so that the support plate rotates around the axis of the rotating shaft to just below the bolt mounting column of the welding special-shaped part; and a pad is placed on the support plate, and the pad is used to support the lower end surface of the bolt mounting column.

[0010] Preferably, two support plates are respectively arranged on the cantilever plates of the first clamping block and the second clamping block, and pads are respectively placed on the four support plates for supporting four bolt mounting columns on the welding special-shaped parts.

[0011] Preferably, a slide groove is provided on the top of the clamping block mounting seat; sliders are integrally formed at the bottom ends of the screw mounting parts of the first clamping block and the second clamping block respectively; the sliders are slidably matched with the slide groove; a pressure plate is installed on the top of the clamping block mounting seat by a first screw, and the pressure plate rests on the top surface of the slider.

[0012] Preferably, an extension plate is integrally formed on the slider, and a slot is provided on the extension plate; a locking screw is screwed on the bottom of the slot; and the locking screw is inserted in the slot of the extension plate; a second washer is sleeved on the locking screw, and the second washer rests on the top surface of the extension plate; when clamping the welding special-shaped part, after the lead screw drives the first clamping block and the second clamping block to move closer to each other to clamp the shell of the welding special-shaped part, the locking screw is tightened so that the second washer is pressed against the extension plate of the slider; when the welding special-shaped part needs to be loosened, the locking screw is first loosened, and the lead screw is rotated to drive the first clamping block and the second clamping block to move away from each other.

[0013] Preferably, the ends of the lead screw at both ends are respectively arranged as wrench fitting sections; and the wrench fitting sections are of a quadrangular prism structure.

[0014] Preferably, a stopper is mounted on the angular positioning seat by means of screws, and the stopper is located directly below the U-shaped groove; and the lower end of the angular positioning pin abuts against the top surface of the stopper.

[0015] Preferably, a tool setting block is mounted on the top surface of the base by a second screw; the top surface P and the right side surface M of the tool setting block are tool setting surfaces.

[0016] Preferably, the upper half of the hollow positioning sleeve is set as the positioning section, and the lower half is set as the plug-in section; the outer diameter of the positioning section is larger than the outer diameter of the plug-in section; the plug-in section is inserted into the through hole of the bent portion of the support by means of interference fit; the positioning section is used to insert into the positioning hole of the welding special-shaped part; when the fastening screw is tightened to tighten the welding special-shaped part, a feeler gauge is used to check that the gap between the lower end surface of the nozzle and the bent portion of the support is no more than 0.1 mm, indicating that the fastening screw is tightened into place.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0018] (1) By adopting the clamping method provided by the present invention, when clamping the welding special-shaped part, the upper half of the hollow positioning sleeve is inserted into the positioning hole of the welding special-shaped part; the fastening screw passes through the first washer and the center hole of the hollow positioning sleeve and is screwed into the process threaded hole of the welding special-shaped part, and the fastening screw is tightened to tighten the welding special-shaped part so that the lower end surface of the nozzle of the welding special-shaped part abuts against the bent part of the support; an angular positioning pin is inserted into the pin hole of the welding special-shaped part; the lower end of the angular positioning pin is clamped on the U-shaped groove of the angular positioning seat. The welding special-shaped part can be fastened and angularly positioned, and the clamping is simple and convenient.

[0019] (3) By adopting the clamping method provided by the present invention, the protruding blocks on the first clamping block and the second clamping block are clamped on the shell of the welded special-shaped part, and the bottom surfaces of the four bolt mounting columns on the welded special-shaped part are supported by the supporting plate and the pad block, thereby further improving the stability of the clamping and facilitating improving the qualified rate of parts processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a partial structural cross-sectional view of a welded special-shaped part;

[0022] Figure 2 This is a main cross-sectional view of the welding special-shaped part after the clamp is used to clamp the welding special-shaped part in the present invention;

[0023] Figure 3 It is a top view of the welding special-shaped part after the clamp is used to clamp the welding special-shaped part in the present invention;

[0024] Figure 4 It is a top view of the structure of the base in the present invention;

[0025] Figure 5 It is a front view of the clamp block mounting seat in the present invention;

[0026] Figure 6 A top view of the clamp block mounting seat of the present invention;

[0027] Figure 7 It is a top view of the structure of the pressure plate in the present invention;

[0028] Figure 8 for Figure 7 Middle AA section view;

[0029] Fig. 9 It is a top view of the structure of the angular positioning seat in the present invention;

[0030] Fig.10 for Fig. 9 Middle BB section view;

[0031] Fig.11 It is a schematic diagram of the structure of the angular positioning pin in the present invention;

[0032] Fig.12 It is a front view of the stopper in the present invention;

[0033] Fig.13 It is a left side view of the stopper in the present invention;

[0034] Fig.14 is a cross-sectional view of the hollow positioning sleeve of the present invention;

[0035] Fig.15 It is a top view of the structure of the support in the present invention;

[0036] Fig.16 for Fig.15 Middle CC section view;

[0037] Fig.17 It is a structural schematic diagram of the screw rod in the present invention;

[0038] Fig.18 for Fig.17 Middle DD section view;

[0039] Fig.19 It is a front view of the tool setting block in the present invention;

[0040] Fig. 20 A top view of the tool block in the present invention;

[0041] Fig.21 It is a front view of the first clamping block in the present invention;

[0042] Fig. 22 A top view of the first clamping block in the present invention;

[0043] Fig.23 This is a front view of the second clamping block in the present invention;

[0044] Fig.24 It is a top view of the second clamping block in the present invention;

[0045] Fig.25 It is a cross-sectional view of the first gasket in the present invention.

[0046] Description of the accompanying drawings: 1. Base; 2. Clamping block mounting seat; 2a. Slide groove; 3. Pressing plate; 4. Angular positioning seat; 4a. U-shaped groove; 5. Angular positioning pin; 6. Stopper; 7. Hollow positioning sleeve; 7a. Positioning section; 7b. Insertion section; 8. First washer; 9. Support; 10. Tool setting block; 11. Screw rod; 11a. First screw section; 11b. Second screw section; 11c. Wrench matching section; 12. First clamping block; 13. Second clamping block; 14. Label; 15. Slotted disc screw; 16. Second screw; 17. Fastening screw; 1 8. Limit screw; 19. Second washer; 20. First screw; 21. Third screw; 22. First cylindrical pin; 23. Second cylindrical pin; 24. Support plate; 25. Spacer; 26. Screw mounting portion; 27. Cantilever plate; 27a. Raised block; 28. Slider; 28a. Slot; 29. ​​Rotating shaft; 100. Welded special-shaped part; 101. Shell; 102. Edge plate; 103. Bolt mounting column; 104. Nozzle; 104a. Positioning hole; 104b. Process threaded hole; 105. Angular positioning block; 105a. Pin hole. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Combination Figure 1As shown, the welding special-shaped part 100 includes a shell 101, an edge plate 102 is welded on the shell 101, bolt installation columns 103 are inserted at the four corners of the edge plate 102, and the bolt installation columns 103 are welded to the edge plate 102. The bottom of the welding special-shaped part 100 is provided with a nozzle 104 and an angular positioning block 105, a process threaded hole 104b and a positioning hole 104a with a diameter of φD are provided at the center of the nozzle 104, and a pin hole 105a with a diameter of φE is provided on the angular positioning block 105 for angular positioning. The top surface M of the edge plate 102 is a mounting plane, which needs to be milled, and the welding part between the bolt installation column 103 and the edge plate 102 is milled flat.

[0051] Combination Figures 2 to 25 As shown, this embodiment provides a clamping method for the milling and processing installation plane of welding special-shaped parts, using a fixture to clamp the welding special-shaped part 100, the fixture includes a base 1 and a fastening screw 17; a support 9 is installed on the top surface of the base 1, the upper part of the support 9 is set as a bending part 9a, and a hollow positioning sleeve 7 is inserted in the through hole of the bending part 9a, and the upper half of the hollow positioning sleeve 7 is inserted in the positioning hole 104a of the welding special-shaped part 100; a first washer 8 is provided on the lower surface of the bending part 9a, and the fastening screw 17 passes through the first washer 8, the hollow positioning sleeve 7 in sequence, and the first washer 8 is inserted into the hollow positioning sleeve 7. The center hole of the center positioning sleeve 7 is screwed into the process threaded hole 104b of the welding shaped part 100, and the fastening screw 17 is tightened to tighten the welding shaped part 100, so that the lower end surface of the nozzle 104 of the welding shaped part 100 is against the bent part 9a of the support 9; an angular positioning seat 4 is installed on the top surface of the base 1 through the third screw 21 and the second cylindrical pin 23; a U-shaped groove 4a is provided on the angular positioning seat 4; an angular positioning pin 5 is inserted into the pin hole 105a of the welding shaped part 100; the lower end of the angular positioning pin 5 is stuck in the U-shaped groove 4a of the angular positioning seat 4. When the fastening screw 17 is tightened to tighten the welding shaped part 100, use a feeler gauge to check that the gap between the lower end surface of the nozzle 104 and the bent part 9a of the support 9 is not greater than 0.1mm, indicating that the fastening screw 17 is tightened in place.

[0052] A plurality of two clamping block mounting seats 2 are mounted on the top surface of the base 1. Specifically, the clamping block mounting seats 2 are mounted on the base 1 through first cylindrical pins 22 and screws. A first clamping block 12 is slidably mounted on the top of one of the clamping block mounting seats 2, and a second clamping block 13 is slidably mounted on the top of the other clamping block mounting seat 2; the first clamping block 12 and the second clamping block 13 respectively include a screw rod mounting portion 26 and a cantilever plate 27 integrally formed on the screw rod mounting portion 26; a protruding block 27a is integrally formed on the side of the cantilever plate 27; a screw 11 is commonly mounted on the screw rod mounting portions 26 of the first clamping block 12 and the second clamping block 13; the screw 11 is provided with a protruding block 27a on the side of the cantilever plate 27; a screw 11 is provided on the screw rod mounting portions 26 of the first clamping block 12 and the second clamping block 13; It has a first screw segment 11a and a second screw segment 11b with opposite thread rotation directions; the first screw segment 11a and the second screw segment 11b are respectively matched with the threaded holes on the screw mounting parts 26 on the first clamping block 12 and the second clamping block 13; when clamping the welding special-shaped part 100, the rotating screw 11 drives the first clamping block 12 and the second clamping block 13 to move closer to each other, so that the protruding blocks 27a on the first clamping block 12 and the second clamping block 13 are clamped on the shell 101 of the welding special-shaped part 100.

[0053] A support plate 24 is installed on the cantilever plate 27 through a rotating shaft 29; when the welding shaped part 100 is clamped, after the lead screw 11 drives the first clamping block 12 and the second clamping block 13 to move closer to each other and clamp the housing 101 of the welding shaped part 100, the support plate 24 is rotated so that the support plate 24 rotates around the axis of the rotating shaft 28 to the right below the bolt installation column 103 of the welding shaped part 100; and a cushion block 25 is placed on the support plate 24, and the cushion block 25 is supported on the lower end surface of the bolt installation column 103. Further, two support plates 24 are respectively arranged on the cantilever plates 27 of the first clamping block 12 and the second clamping block 13, and cushion blocks 25 are respectively placed on the four support plates 24 to support the four bolt installation columns 103 on the welding shaped part 100.

[0054] A slide groove 2a is provided at the top of the clamping block mounting seat 2; sliders 28 are integrally formed at the bottom ends of the screw mounting parts 26 of the first clamping block 12 and the second clamping block 13 respectively; the sliders 28 are slidably matched with the slide groove 2a; a pressure plate 3 is installed at the top of the clamping block mounting seat 2 by a first screw 20, and the pressure plate 3 rests on the top surface of the slider 28.

[0055] An extension plate is integrally formed on the slider 28, and a slot 28a is provided on the extension plate; a locking screw 18 is screwed on the bottom of the slide slot 2a; and the locking screw 18 is inserted in the slot 28a of the extension plate; a second washer 19 is sleeved on the locking screw 18, and the second washer 19 is placed on the top surface of the extension plate; when the welding special-shaped part 100 is clamped, after the lead screw 11 drives the first clamping block 12 and the second clamping block 13 to move closer to each other to clamp the shell 101 of the welding special-shaped part 100, the locking screw 18 is tightened so that the second washer 19 is pressed against the extension plate of the slider 28; when the welding special-shaped part 100 needs to be loosened, the locking screw 18 is first loosened, and the lead screw 11 is rotated to drive the first clamping block 12 and the second clamping block 13 to move away from each other.

[0056] Combination Fig.17 , 18 As shown, the ends of the screw 11 are respectively provided with wrench fitting sections 11c; the wrench fitting sections 11c are of a quadrangular prism structure. The wrench fitting sections 11c are used to fit with a wrench to facilitate the rotation of the screw 11.

[0057] Combination Figure 2 As shown, a stopper 6 is installed on the angular positioning seat 4 by means of screws, and the stopper 6 is located directly below the U-shaped groove 4 a ; the lower end of the angular positioning pin 5 abuts against the top surface of the stopper 6 .

[0058] Combination Figure 2 As shown, a tool setting block 10 is mounted on the top surface of the base 1 by means of a second screw 16; the top surface P and the right side surface Q of the tool setting block 10 are tool setting surfaces.

[0059] Combination Fig.14 As shown, the upper half of the hollow positioning sleeve 7 is set as the positioning section 7a, and the lower half is set as the plug-in section 7b; the outer diameter of the positioning section 7a is larger than the outer diameter of the plug-in section 7b; the plug-in section 7b is inserted into the through hole of the bent portion 9a of the support 9 by means of interference fit.

[0060] The clamping method provided by the present invention includes the following two processes:

[0061] (1) Fixture assembly process:

[0062] The angular positioning seat 4 is installed on the base 1 through the third screw 21 and the second cylindrical pin 23. The two clamping block mounting seats 2 are installed on the base 1 through the first cylindrical pin 22 and the screw respectively. The support 9 is installed on the mounting seat 1 through the screw and the pin. Insert the hollow positioning sleeve 7 into the matching hole of the bending part 9a of the support 9. The screw rod 11 is installed in the threaded hole on the screw rod mounting part 26 of the first clamping block 12 and the second clamping block 13, and the first clamping block 12 and the second clamping block 13 are installed on the slide groove 2a of the clamping block mounting seat 2 respectively. The pressure plate 3 is installed on the top of the clamping block mounting seat 2 through the first screw 20, and the pressure plate 3 is placed on the top surface of the slider 28 of the first clamping block 12 and the second clamping block 13. Under the control of the screw rod 11, the first clamping block 12 and the second clamping block 13 can move in both directions, such as approaching or moving away from each other. The stopper 6 is installed on the angular positioning seat 4 through the screw. The tool setting block 10 is installed on the base 1 through the second screw 16.

[0063] (2) Parts clamping process:

[0064] Assemble the welding profiled part 100 to be processed onto the fixture. First, the positioning hole 104a with a diameter of φD of the welding profiled part 100 is sleeved on the positioning section 7a of the hollow positioning sleeve 7 on the support 9. Then, a first washer 8 is arranged on the lower surface of the bent portion 9a of the support 9, and the fastening screw 17 is passed through the first washer 8 and the center hole of the hollow positioning sleeve 7 in sequence and then screwed into the process threaded hole 104b of the welding profiled part 100 and pre-tightened. Then, the angular positioning pin 5 is inserted into the pin hole 105a with a diameter of φE on the welding profiled part 100, and the lower end of the angular positioning pin 5 is clamped on the U-shaped groove 4a of the angular positioning seat 4, and the lower end of the angular positioning pin 5 is supported by the stopper 6. The screw rod 11 is rotated so that the first clamping block 12 and the second clamping block 13 are brought close to each other to clamp the two side surfaces of the shell 101 of the welding profiled part 100. Rotate the support plate 24 so that the support plate 24 rotates around the axis of the rotating shaft 28 to just below the bolt mounting column 103 of the welding special-shaped part 100; and place a cushion block 25 on the support plate 24, and use the cushion block 25 to support the lower end surface of the bolt mounting column 103.

[0065] Finally, tighten the fastening screw 17 again and use a feeler gauge to check that the gap between the lower end surface of the nozzle 104 and the bent portion 9a of the support 9 is no greater than 0.1 mm, indicating that the fastening screw 17 is tightened in place.

[0066] Combination Figure 2 As shown, before milling the top surface M of the edge plate 102, align the front and rear end surfaces of the fixture base 1 to determine the zero point in the Y direction. Align the right side surface Q of the tool block 10 and translate it to the right according to the dimension X to determine the zero point in the X direction. Align the top surface P of the tool block 10 and translate it upward according to the dimension Z to determine the zero point in the Z direction.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A clamping method for the milling and mounting plane of welding special-shaped parts, characterized in that: A clamp is used to clamp the welding special-shaped part (100), wherein the clamp comprises a base (1) and a fastening screw (17); A support (9) is installed on the top surface of the base (1), the upper part of the support (9) is arranged as a bending part (9a), and a hollow positioning sleeve (7) is inserted into the through hole of the bending part (9a), and the upper half of the hollow positioning sleeve (7) is inserted into the positioning hole (104a) of the welding special-shaped part (100); A first washer (8) is arranged on the lower surface of the bent portion (9a); the fastening screw (17) passes through the first washer (8) and the center hole of the hollow positioning sleeve (7) in sequence and then is screwed into the process threaded hole (104b) of the welding special-shaped part (100); the fastening screw (17) is tightened to tighten the welding special-shaped part (100) so that the lower end surface of the nozzle (104) of the welding special-shaped part (100) abuts against the bent portion (9a) of the support (9); An angular positioning seat (4) is installed on the top surface of the base (1); a U-shaped groove (4a) is provided on the angular positioning seat (4); an angular positioning pin (5) is inserted into the pin hole (105a) of the welding special-shaped part (100); and the lower end of the angular positioning pin (5) is clamped in the U-shaped groove (4a) of the angular positioning seat (4).

2. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 1, characterized in that: A plurality of two clamping block mounting seats (2) are mounted on the top surface of the base (1), a first clamping block (12) is slidably mounted on the top of one of the clamping block mounting seats (2), and a second clamping block (13) is slidably mounted on the top of the other clamping block mounting seat (2); The first clamping block (12) and the second clamping block (13) respectively comprise a screw rod mounting portion (26) and a cantilever plate (27) integrally formed on the screw rod mounting portion (26); a protrusion block (27a) is integrally formed on the side surface of the cantilever plate (27); and a screw rod (11) is commonly mounted on the screw rod mounting portions (26) of the first clamping block (12) and the second clamping block (13); The lead screw (11) is provided with a first screw segment (11a) and a second screw segment (11b) having opposite thread rotation directions; The first screw segment (11a) and the second screw segment (11b) respectively match the threaded holes on the screw mounting parts (26) on the first clamping block (12) and the second clamping block (13); When clamping the welding special-shaped part (100), the rotating screw (11) drives the first clamping block (12) and the second clamping block (13) to move closer to each other, so that the protruding blocks (27a) on the first clamping block (12) and the second clamping block (13) are clamped on the shell (101) of the welding special-shaped part (100).

3. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 2, characterized in that: A support plate (24) is installed on the cantilever plate (27) via a rotating shaft (29); when the welding special-shaped part (100) is clamped, after the lead screw (11) drives the first clamping block (12) and the second clamping block (13) to move closer together to clamp the shell (101) of the welding special-shaped part (100), the support plate (24) is rotated so that the support plate (24) rotates around the axis of the rotating shaft (28) to the position directly below the bolt mounting column (103) of the welding special-shaped part (100); and a cushion block (25) is placed on the support plate (24) and supported on the lower end surface of the bolt mounting column (103) by the cushion block (25).

4. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 3, characterized in that: Two support plates (24) are respectively arranged on the cantilever plates (27) of the first clamping block (12) and the second clamping block (13), and pads (25) are respectively placed on the four support plates (24) for supporting four bolt mounting columns (103) on the welded special-shaped part (100).

5. A clamping method for milling and machining installation planes for welding special-shaped parts as claimed in claim 2, characterized in that: A slide groove (2a) is provided on the top of the clamping block mounting seat (2); Slide blocks (28) are integrally formed at the bottom ends of the screw rod mounting parts (26) of the first clamping block (12) and the second clamping block (13); the slide blocks (28) are slidably matched with the slide grooves (2a); A pressure plate (3) is installed on the top of the clamping block mounting seat (2) via a first screw (20), and the pressure plate (3) rests on the top surface of the sliding block (28).

6. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 5, characterized in that: An extension plate is integrally formed on the slide block (28), and a slot (28a) is provided on the extension plate; a locking screw (18) is screwed on the bottom of the slide slot (2a); and the locking screw (18) is inserted into the slot (28a) of the extension plate; a second washer (19) is sleeved on the locking screw (18), and the second washer (19) rests on the top surface of the extension plate; When clamping the welding special-shaped part (100), after the lead screw (11) drives the first clamping block (12) and the second clamping block (13) to move closer together to clamp the housing (101) of the welding special-shaped part (100), the locking screw (18) is tightened so that the second washer (19) is pressed against the extension plate of the slider (28); When it is necessary to loosen the welding special-shaped part (100), first loosen the locking screw (18), and rotate the lead screw (11) to drive the first clamping block (12) and the second clamping block (13) to move away from each other.

7. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 2, characterized in that: The ends of the lead screw (11) at both ends are respectively arranged as spanner fitting sections (11c); the spanner fitting sections (11c) are of a quadrangular prism structure.

8. A clamping method for the milling and machining of the installation plane of welding special-shaped parts as claimed in claim 1, characterized in that: A stopper (6) is installed on the angular positioning seat (4) by means of screws, and the stopper (6) is located directly below the U-shaped groove (4a); the lower end of the angular positioning pin (5) abuts against the top surface of the stopper (6).

9. A clamping method for milling and machining installation planes for welding special-shaped parts as claimed in claim 1, characterized in that: A tool setting block (10) is mounted on the top surface of the base (1) via a second screw (16); the top surface P and the right side surface M of the tool setting block (10) are tool setting surfaces.

10. A clamping method for the milling and machining installation plane of welding special-shaped parts as claimed in claim 1, characterized in that: The upper half of the hollow positioning sleeve (7) is configured as a positioning section (7a), and the lower half is configured as an inserting section (7b); the outer diameter of the positioning section (7a) is greater than the outer diameter of the inserting section (7b); the inserting section (7b) is inserted into the through hole of the bent portion (9a) of the support (9) in an interference fit manner; the positioning section (7a) is used to be inserted into the positioning hole (104a) of the welding special-shaped part (100); When the fastening screw (17) is tightened to tighten the welded special-shaped part (100), a feeler gauge is used to check that the gap between the lower end surface of the nozzle (104) and the bent portion (9a) of the support (9) is no greater than 0.1 mm, indicating that the fastening screw (17) is tightened in place.

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