Welding combined type spiral bevel gear milling cutter and welding tool

Abstract

The invention discloses a welding combined type spiral bevel gear milling cutter and a welding tool, and relates to the technical field of welding. The milling cutter comprises a base, a connecting seat is welded to the top of the base, a milling cutter body is welded to the top of the connecting seat, a positioning device is arranged at the top of the base and comprises a first positioning groove, the inner wall of the first positioning groove is formed in the top of the base, and a second positioning groove is formed in the bottom of the connecting seat. A hollow positioning column is clamped to the inner wall of the first positioning groove. Through the arrangement of the positioning device, the first positioning groove, the second positioning groove and the hollow positioning column are matched, the connecting base and the milling cutter body are welded to the base through welding bonding points, the hollow positioning column is clamped into the first positioning groove, and then the second positioning groove of the connecting base is aligned to the hollow positioning column; therefore, the base can be accurately welded together, and local weaknesses or defects such as air connecting holes and cracks are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a welding combined spiral bevel milling cutter and a welding tool. Background Art

[0002] Welded combined spiral bevel gear milling cutter (usually used in the field of mechanical processing, especially in the process of machining, repair or manufacturing) is a high-precision gear processing tool, which is widely used in aerospace, automobile, engineering machinery and other industries. Due to the complexity of its shape and size, welding process plays a vital role in its production process.

[0003] A Chinese patent with patent announcement number CN216939129U discloses a welding tool and a workpiece, wherein the welding tool includes a tool body and a sliding component, the tool body has a first surface and a second surface that are opposite to each other, a welding groove is provided on the tool body, and the welding groove passes through the first surface and the second surface; the sliding component is at least provided on the first surface, and the sliding component can slide close to or away from the welding groove to fix or loosen the workpiece loaded into the welding groove. This technical solution can reuse the welding tool and save production costs.

[0004] However, the welding tool currently has the following problems: when welding, it is difficult to position the connecting seat and the milling cutter body with the base through the welding bonding point, the welding joint will form uneven metal fusion, resulting in poor weld quality and defects (such as pores, slag inclusions, cracks, etc.), which directly affect the strength and stability of the joint. Therefore, we propose a welded combined spiral bevel milling cutter and welding tool. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a welded combined spiral bevel milling cutter and a welding tool, which solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a welded combined spiral bevel milling cutter and welding tooling, including a base, a connecting seat welded on the top of the base, and a milling cutter body welded on the top of the connecting seat.

[0007] A welding tool for welding a combined spiral bevel milling cutter, wherein a positioning device is provided on the top of the base, the positioning device includes a positioning groove 1, the inner wall of the positioning groove 1 is opened on the top of the base, and a positioning groove 2 is opened at the bottom of the connecting seat, and a hollow positioning column is clamped on the inner wall of the positioning groove 1, and a plurality of welding bonding points are welded on the top of the base, and then the connecting seat and the milling cutter body are welded to the base through the welding bonding points, and then the hollow positioning column is clamped to the inside of the positioning groove 1, and then the positioning groove 2 of the connecting seat is aligned with the hollow positioning column, so that the base can be accurately welded to the base.

[0008] According to the above technical solution, an arc-shaped plate passes through and slides on the upper part of the outer wall of the hollow positioning column, the inner wall of the hollow positioning column is fixedly connected to a track block, the inner wall of the track block is slidably connected to two sliders 1, the tops of the two sliders 1 are fixedly connected to an L-shaped rod, the end of the L-shaped rod away from the slider 1 is fixedly connected to a push block, the bottom of the inner wall of the track block is fixedly connected to the track plate, the two sliders 1 are hinged on one side facing each other, the two hinged rods 1 are hinged on one end away from the slider 1 to a slider 2, the side of the slider 2 away from the hinged rod 1 is slidably connected to the side of the track plate, and the top of the slider 2 is fixedly connected to A connecting block, the top of which is fixedly connected with a T-shaped rod, the T-shaped rod is located on the displacement track of the second positioning groove, and the arc plate is located on the displacement track of the push block. When the second positioning groove moves toward the hollow positioning column, the inner wall of the second positioning groove first contacts the T-shaped rod, thereby pressing the T-shaped rod downward, and the downward movement of the T-shaped rod will drive the connecting block to move downward, and the movement of the connecting block will drive the second slider to move. The movement of the second slider will push the first slider away from the push block through the hinged rod, and the movement of the first slider will move the push block toward the direction of the arc plate through the L-shaped rod, so that the arc-shaped outer wall of the arc plate conflicts with the inner wall of the second positioning groove.

[0009] According to the above technical solution, the outer wall of the hollow positioning column is provided with an anti-pollution device, and the anti-pollution device includes an annular placement block, the top of the annular placement block is fixedly passed through the outer wall of the hollow positioning column, the inner sliding connection of the annular placement block is provided with a slider three, the bottom of the slider three is provided with a protective plate, the side of the slider three is provided with a triangular block, the bottom of the protective plate is in contact with the top of the base, and when the hollow positioning column is clamped into the inside of the positioning groove one, the hollow positioning column will drive the annular placement block to be placed on the outer wall of the base, and after the annular placement block is placed, the protective plate will be placed on the bonding point where the base and the connecting seat are welded through the slider three, thereby avoiding before the base and the connecting seat are welded.

[0010] According to the above technical solution, the top of the slider three is hinged with a hinge rod two, and the end of the hinge rod two away from the slider three is hinged with a support block, the outer wall of the annular placement block is fixedly connected with a two-way telescopic plate, and the side of the support block away from the hinge rod two is fixedly connected to the telescopic end of the two-way telescopic plate, the triangular block is located on the displacement track of the connecting seat, and the bottom of the triangular block contacts the top of the protective plate. When the connecting seat moves in the direction of the base, the bottom of the connecting seat will contact the inclined surface of the triangular block, thereby pushing the triangular block in the direction away from the base along the inclined surface of the triangular block, and the movement of the triangular block will drive the slider three to move, and the movement of the slider three will drive the protective plate to leave the welding bonding point of the base, so that the connecting seat can be connected to the base; when the protective plate moves in the direction away from the base, the protective plate will drive the upper and lower sliders three to move, and the movement of the two sliders three will drive the support blocks to move in opposite directions through their respective hinge rods two, and the movement of the support block will drive the two telescopic ends of the two-way telescopic plate to stretch, so that the two-way telescopic plate protects the base and the connecting seat.

[0011] According to the above technical solution, a tight device is provided at the top of the inner wall of the T-shaped rod, and the tight device includes two connecting rods, the tops of the two connecting rods are fixedly connected to the top of the inner wall of the T-shaped rod, the bottoms of the two connecting rods are fixedly connected to the same spiral groove column, a support ring is fixedly connected to the lower part of the inner wall of the hollow positioning column, the inner wall of the support ring is rotatably connected to a swivel, the interior of the swivel is fixedly connected to a moving block for sliding installation inside the spiral groove of the spiral groove column, the bottom of the swivel is fixedly connected to a rotating ring, the bottom of the rotating ring is provided with an arc groove, the bottom of the support ring is fixedly connected to a long block, the side of the long block is fixedly connected to a track plate, the bottom of the track plate is provided with a long groove, the inner wall of the arc groove of the rotating ring is slidably connected to a moving rod, the bottom of the moving rod is fixedly connected to a T-shaped interference block, and a fixed groove is provided at the lower part of the outer wall of the hollow positioning column. The movement of the moving rod will drive the T-shaped resistance block to move along the direction of the cross block to avoid the fixed groove, and the movement of the T-shaped resistance block will conflict with the inner wall of the positioning groove one.

[0012] The present invention provides a welded combined spiral bevel milling cutter and a welding tool. It has the following beneficial effects:

[0013] (1) The present invention sets a positioning device, so that the positioning groove 1, the positioning groove 2, and the hollow positioning column cooperate, so that the connecting seat and the milling cutter body are welded together with the base through the welding bonding point, the hollow positioning column is snapped into the inside of the positioning groove 1, and then the positioning groove 2 of the connecting seat is aligned with the hollow positioning column, so that the base can be accurately welded to the base, avoiding the occurrence of local weaknesses or defects such as air holes and cracks; at the same time, through the cooperation of the track block, the arc plate, the slider 1, the L-shaped rod, the push block, the track plate, the slider 2, the hinged rod 1, the connecting block, and the T-shaped rod, the movement of the slider 2 is pushed away from the push block through the hinged rod 1, and the movement of the slider 1 is moved toward the arc plate through the L-shaped rod, so that the arc-shaped outer wall of the arc plate conflicts with the inner wall of the positioning groove 2, thereby enhancing the stability of the connecting seat and the milling cutter body when they are welded to the base through the welding bonding point.

[0014] (2) The present invention sets an anti-pollution device so that the annular placement block, the slider three and the protective plate cooperate with each other, so that after the annular placement block is placed, the slider three will place the protective plate at the bonding point where the base and the connecting seat are welded, thereby avoiding the presence of debris at the bonding point before the base and the connecting seat are welded, affecting the integrity of the weld and making it easy to crack or brittle fracture; at the same time, through the cooperation of the triangular block, the hinged rod two, the support block and the two-way telescopic plate, the protective plate will drive the upper and lower sliders three to move, and the movement of the two sliders three will drive the support blocks to move in opposite directions through their respective hinged rods two, and the movement of the support block will drive the two telescopic ends of the two-way telescopic plate to stretch, so that the two-way telescopic plate protects the base and the connecting seat, thereby avoiding the possibility of the base and the connecting seat being loosened due to external forces (such as accidental falling).

[0015] (3) The present invention arranges a tight device so that the connecting rod, spiral groove column, support ring, swivel ring, rotating ring, long block, track plate, moving rod, T-shaped interference block, cross-shaped block and fixed groove cooperate, so that the moving rod can only move horizontally, and the movement of the moving rod will drive the T-shaped interference block to move along the direction of the cross-shaped block to avoid the fixed groove. The movement of the T-shaped interference block will interfere with the inner wall of the positioning groove, thereby enhancing the stability of the hollow positioning column and the base, and making the connection seat and the milling cutter body welded to the base through the welding bonding point more stable and tight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the present invention as a whole;

[0017] Figure 2 This is a schematic diagram of the structure of the connection seat of the present invention;

[0018] Figure 3 This is a structural schematic diagram of the hollow positioning column of the present invention;

[0019] Figure 4 The structure diagram of the positioning device of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 5 The structure diagram of the positioning device of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 6 The structure of the anti-pollution device of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at A in the middle;

[0023] Figure 8 It is a structural schematic diagram of the compacting device of the present invention.

[0024] In the figure: 1, base; 3, milling cutter body; 4, connecting seat; 5, positioning device; 51, positioning groove one; 52, positioning groove two; 53, hollow positioning column; 54, track block; 55, arc plate; 56, slider one; 57, L-shaped rod; 58, push block; 59, track plate; 510, slider two; 511, hinged rod one; 512, connecting block; 513, T-shaped rod; 6, anti-pollution device; 61, annular placement block; 62, slider three; 63, protective plate; 64, triangular block; 65, hinged rod two; 66, support block; 67, two-way telescopic plate; 7, tight device; 71, connecting rod; 72, spiral groove column; 73, support ring; 74, swivel; 75, rotating ring; 76, long block; 77, track plate; 78, moving rod; 79, T-shaped resistance block; 710, cross block; 711, fixed groove. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] See also Figure 1-Figure 8 One embodiment of the present invention is: a welded combined spiral bevel milling cutter and welding tooling, including a base 1, a connecting seat 4 is welded on the top of the base 1, and a milling cutter body 3 is welded on the top of the connecting seat 4.

[0027] A welding tool for welding a combined spiral bevel milling cutter, wherein a positioning device 5 is provided on the top of a base 1, the positioning device 5 comprises a positioning groove 1 51, the inner wall of the positioning groove 1 51 is provided on the top of the base 1, a positioning groove 2 52 is provided on the bottom of a connecting seat 4, a hollow positioning column 53 is clamped on the inner wall of the positioning groove 1 51, through the arrangement of the above structure, the positioning groove 2 52 of the connecting seat 4 is aligned with the hollow positioning column 53, so that the base 1 can be accurately welded to the base 1, avoiding the occurrence of local weaknesses or defects such as air holes and cracks.

[0028] An arc plate 55 is inserted and slidably provided on the outer wall of the hollow positioning column 53, a track block 54 is fixedly connected to the inner wall of the hollow positioning column 53, two sliders 56 are slidably connected to the inner wall of the track block 54, the tops of the two sliders 56 are fixedly connected to an L-shaped rod 57, the end of the L-shaped rod 57 away from the slider 56 is fixedly connected to a push block 58, the bottom of the inner wall of the track block 54 is fixedly connected to a track plate 59, the two sliders 56 are hingedly connected to the opposite sides with a hinged rod 1 511, and the ends of the two hinged rods 1 511 away from the slider 1 56 are hingedly connected to the slider 2 510 The side of the slider 2 510 away from the hinge rod 1 511 is slidably connected to the side of the track plate 59, the top of the slider 2 510 is fixedly connected with a connecting block 512, the top of the connecting block 512 is fixedly connected with a T-shaped rod 513, the T-shaped rod 513 is located on the displacement track of the positioning groove 2 52, and the arc plate 55 is located on the displacement track of the push block 58. Through the arrangement of the above structure, the arc-shaped outer wall of the arc plate 55 conflicts with the inner wall of the positioning groove 2 52, thereby enhancing the stability of the connecting seat 4 and the milling cutter body 3 when they are welded to the base 1 through the welding bonding point.

[0029] The outer wall of the hollow positioning column 53 is provided with an anti-pollution device 6, and the anti-pollution device 6 includes an annular placement block 61. The top of the annular placement block 61 is fixedly passed through the outer wall of the hollow positioning column 53. The inside of the annular placement block 61 is slidably connected with a slider three 62. The bottom of the slider three 62 is fixedly connected with a protective plate 63. The side of the slider three 62 is fixedly connected with a triangular block 64. The bottom of the protective plate 63 contacts the top of the base 1. Through the setting of the above structure, after the annular placement block 61 is placed, the slider three 62 will place the protective plate 63 at the bonding point where the base 1 and the connecting seat 4 are welded, thereby avoiding the appearance of debris at the bonding point before the base 1 and the connecting seat 4 are welded, affecting the integrity of the weld and making it prone to cracks or brittle fracture.

[0030] The top of the slider three 62 is hinged with a hinge rod two 65, and the end of the hinge rod two 65 away from the slider three 62 is hinged with a support block 66. The outer wall of the annular placement block 61 is fixedly connected with a two-way telescopic plate 67, and the side of the support block 66 away from the hinge rod two 65 is fixedly connected to the telescopic end of the two-way telescopic plate 67. The triangular block 64 is located on the displacement trajectory of the connecting seat 4, and the bottom of the triangular block 64 contacts the top of the protective plate 63. Through the setting of the above structure, the movement of the support block 66 will drive the two telescopic ends of the two-way telescopic plate 67 to stretch, so that the two-way telescopic plate 67 protects the base 1 and the connecting seat 4, thereby avoiding the possibility of the base 1 and the connecting seat 4 being loosened due to external forces such as accidental falling.

[0031] When in use, several welding points are welded on the top of the base 1, and then the connecting seat 4 and the milling cutter body 3 are welded to the base 1 through the welding points, and then the hollow positioning column 53 is snapped into the inside of the positioning groove 1 51, and then the positioning groove 2 52 of the connecting seat 4 is aligned with the hollow positioning column 53, so that the base 1 can be accurately welded to the base 1 to avoid local weaknesses or defects such as air holes and cracks; when the positioning groove 2 52 moves toward the hollow positioning column 53, the inner wall of the positioning groove 2 52 first contacts the T-shaped rod 513, so that the T-shaped rod 51 3 is pressed downward, the downward movement of the T-shaped rod 513 will drive the connecting block 512 to move downward, the movement of the connecting block 512 will drive the sliding block 2 510 to move, the movement of the sliding block 2 510 will push the sliding block 1 56 away from the pushing block 58 through the hinge rod 1 511, and the movement of the sliding block 1 56 will move the pushing block 58 toward the direction of the arc plate 55 through the L-shaped rod 57, so that the arc-shaped outer wall of the arc plate 55 conflicts with the inner wall of the positioning groove 2 52, thereby enhancing the stability of the connecting seat 4 and the milling cutter body 3 when being welded to the base 1 through the welding bonding point.

[0032] When the hollow positioning column 53 is clipped into the interior of the positioning groove 1 51, the hollow positioning column 53 will drive the annular placement block 61 to be placed on the outer wall of the base 1. After the annular placement block 61 is placed, the protective plate 63 will be placed on the bonding point where the base 1 and the connecting seat 4 are welded through the slider 3 62, thereby avoiding the presence of debris at the bonding point before the base 1 and the connecting seat 4 are welded, affecting the integrity of the weld and making it prone to cracks or brittle fractures; when the connecting seat 4 moves toward the direction of the base 1, the bottom of the connecting seat 4 will contact the inclined surface of the triangular block 64, thereby pushing the triangular block 64 away from the base 1 along the inclined surface of the triangular block 64, and the movement of the triangular block 64 will drive the slider 3 62 to move When the protective plate 63 moves in the direction away from the base 1, the protective plate 63 will drive the upper and lower sliders 3 62 to move, and the movement of the two sliders 3 62 will drive the support block 66 to move in opposite directions through their respective hinge rods 2 65. The movement of the support block 66 will drive the two telescopic ends of the two-way telescopic plate 67 to stretch, so that the two-way telescopic plate 67 protects the base 1 and the connecting seat 4, thereby preventing the base 1 and the connecting seat 4 from being loosened due to external forces such as accidental falling.

[0033] See also Figure 1-Figure 8On the basis of the above embodiment, in another embodiment of the present invention, a tight device 7 is provided at the top of the inner wall of the T-shaped rod 513, and the tight device 7 includes two connecting rods 71, the tops of the two connecting rods 71 ​​are fixedly connected to the top of the inner wall of the T-shaped rod 513, and the bottoms of the two connecting rods 71 ​​are fixedly connected to the same spiral groove column 72, and a support ring 73 is fixedly connected to the lower part of the inner wall of the hollow positioning column 53, and a swivel 74 is rotatably connected to the inner wall of the support ring 73, and a moving block for slidingly installing inside the spiral groove of the spiral groove column 72 is fixedly connected to the inside of the swivel 74, and a rotating ring 75 is fixedly connected to the bottom of the swivel 74, and an arc groove is provided at the bottom of the rotating ring 75, and a long block 76 is fixedly connected to the bottom of the support ring 73, and a track plate 77 is fixedly connected to the side of the long block 76, and a long groove is provided at the bottom of the track plate 77, and a long groove is provided at the bottom of the track plate 77, and the inner wall of the arc groove of the rotating ring 75 slides The movable rod 78 is movably connected, and a T-shaped interference block 79 is fixedly connected to the bottom of the movable rod 78. A fixing groove 711 is opened at the bottom of the outer wall of the hollow positioning column 53, and the fixing groove 711 is located on the displacement track of the T-shaped interference block 79. The inner wall of the long groove of the track plate 77 contacts the outer wall of the movable rod 78. A cross block 710 is fixedly connected to the bottom of the inner wall of the hollow positioning column 53, and the top of the cross block 710 contacts the bottom of the T-shaped interference block 79. Through the setting of the above structure, the movement of the movable rod 78 will drive the T-shaped interference block 79 to move along the direction of the cross block 710 to avoid the fixing groove 711. The movement of the T-shaped interference block 79 will conflict with the inner wall of the positioning groove 51, thereby enhancing the stability of the hollow positioning column 53 and the base 1, so that the connecting seat 4 and the milling cutter body 3 are welded to the base 1 through the welding bonding point more stably and tightly.

[0034] When in use, when the T-shaped rod 513 moves, the movement of the T-shaped rod 513 will drive the spiral groove column 72 to move, and the movement of the spiral groove column 72 will cause the moving block on the inner wall of the rotating ring 74 to rotate along the spiral groove of the spiral groove column 72. The rotation of the moving block on the inner wall of the rotating ring 74 drives the rotating ring 74 to rotate, and the rotation of the rotating ring 74 drives the rotation of the rotating ring 75. The rotation of the rotating ring 75 causes the moving rod 78 to move along the arc groove of the rotating ring 75 toward the direction of the hollow positioning column 53. The moving rod 78 is restricted by the long groove on the track plate 77, and can only be translated when the moving rod 78 is used. The movement of the moving rod 78 will drive the T-shaped resistance block 79 to move along the direction of the cross block 710 to avoid the fixed groove 711. The movement of the T-shaped resistance block 79 will conflict with the inner wall of the positioning groove 51, thereby enhancing the stability of the hollow positioning column 53 and the base 1, and making the connecting seat 4 and the milling cutter body 3 welded to the base 1 through the welding bonding point more stably and tightly.

[0035] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welded combined spiral bevel gear milling cutter, characterized in that: It comprises a base (1), a connecting seat (4) is welded on the top of the base (1), and a milling cutter body (3) is welded on the top of the connecting seat (4).

2. A welding tool for welding a combined spiral bevel milling cutter, characterized in that: A positioning device (5) is provided on the top of the base (1), and the positioning device (5) comprises a first positioning groove (51), the inner wall of which is provided on the top of the base (1); a second positioning groove (52) is provided on the bottom of the connecting seat (4), and a hollow positioning column (53) is clamped on the inner wall of the first positioning groove (51).

3. The welding fixture for welding a combined spiral bevel milling cutter according to claim 2, characterized in that: An arc-shaped plate (55) is inserted through and slides on the outer wall of the hollow positioning column (53); a track block (54) is fixedly connected to the inner wall of the hollow positioning column (53); two sliders (56) are slidably connected to the inner wall of the track block (54); the tops of the two sliders (56) are fixedly connected to an L-shaped rod (57); one end of the L-shaped rod (57) away from the slider (56) is fixedly connected to a push block (58); the bottom of the inner wall of the track block (54) is fixedly connected to a track plate (58); 59), the two sliders (56) are hinged with a hinged rod (511) on one side facing each other, and the two hinged rods (511) are hinged with a slider (510) on one end away from the slider (56), and the side of the slider (510) away from the hinged rod (511) is slidably connected to the side of the track plate (59), and the top of the slider (510) is fixedly connected with a connecting block (512), and the top of the connecting block (512) is fixedly connected with a T-shaped rod (513).

4. The welding fixture for welding a combined spiral bevel milling cutter according to claim 3, characterized in that: The T-shaped rod (513) is located on the displacement track of the second positioning groove (52), and the arc-shaped plate (55) is located on the displacement track of the push block (58).

5. The welding fixture for welding a combined spiral bevel milling cutter according to claim 2, characterized in that: The outer wall of the hollow positioning column (53) is provided with an anti-pollution device (6), and the anti-pollution device (6) comprises an annular placement block (61), the top of the annular placement block (61) is fixedly passed through the outer wall of the hollow positioning column (53), the inside of the annular placement block (61) is slidably connected to a slider three (62), the bottom of the slider three (62) is fixedly connected to a protective plate (63), and the side of the slider three (62) is fixedly connected to a triangular block (64).

6. The welding fixture for welding a combined spiral bevel milling cutter according to claim 5, characterized in that: The top of the slider three (62) is hinged with a hinged rod two (65), and the end of the hinged rod two (65) away from the slider three (62) is hinged with a support block (66), the outer wall of the annular placement block (61) is fixedly connected with a two-way telescopic plate (67), and the side of the support block (66) away from the hinged rod two (65) is fixedly connected to the telescopic end of the two-way telescopic plate (67).

7. The welding fixture for welding a combined spiral bevel milling cutter according to claim 6, characterized in that: The triangular block (64) is located on the displacement track of the connecting seat (4), the bottom of the triangular block (64) is in contact with the top of the protective plate (63), and the bottom of the protective plate (63) is in contact with the top of the base (1).

8. The welding fixture for welding a combined spiral bevel milling cutter according to claim 3, characterized in that: The top of the inner wall of the T-shaped rod (513) is provided with a tightening device (7), and the tightening device (7) comprises two connecting rods (71), the tops of the two connecting rods (71) are fixedly connected to the top of the inner wall of the T-shaped rod (513), the bottoms of the two connecting rods (71) are fixedly connected to the same spiral groove column (72), a support ring (73) is fixedly connected to the lower part of the inner wall of the hollow positioning column (53), the inner wall of the support ring (73) is rotatably connected to a rotating ring (74), the interior of the rotating ring (74) is fixedly connected to a moving block for slidingly mounting in the spiral groove of the spiral groove column (72), and the bottom of the rotating ring (74) is fixedly connected to the rotating ring (73). 5), an arc groove is provided at the bottom of the rotating ring (75), a long block (76) is fixedly connected to the bottom of the supporting ring (73), a track plate (77) is fixedly connected to the side of the long block (76), a long groove is provided at the bottom of the track plate (77), a moving rod (78) is slidably connected to the inner wall of the arc groove of the rotating ring (75), a T-shaped abutment block (79) is fixedly connected to the bottom of the moving rod (78), a fixed groove (711) is provided at the lower part of the outer wall of the hollow positioning column (53), the fixed groove (711) is located on the displacement track of the T-shaped abutment block (79), and the inner wall of the long groove of the track plate (77) is in contact with the outer wall of the moving rod (78).

9. The welding fixture for welding a combined spiral bevel milling cutter according to claim 8, characterized in that: A cross-shaped block (710) is fixedly connected to the lower part of the inner wall of the hollow positioning column (53), and the top of the cross-shaped block (710) is in contact with the bottom of the T-shaped abutment block (79).

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