Gear cutting forming machine tool

Abstract

The invention discloses a gear cutting forming machine tool, and relates to the technical field of gear cutting equipment. The device comprises a machine tool, a step cutting assembly is fixedly installed on a cutting drive of the machine tool, the step cutting assembly is composed of a cutting shaft, a fixed cutting tool and a plurality of sets of adjustable cutting tools, the cutting shaft is fixedly installed on the cutting drive, and the fixed cutting tool is fixedly installed on the cutting shaft; the multiple sets of adjustable cutting tools are connected to the cutting shaft in a sliding mode, and during cutting, the fixed cutting tools and the multiple sets of adjustable cutting tools are distributed in a stepped mode. Segmented cutting is adopted, the large cutting amount can be divided into a plurality of small cutting steps according to the geometrical shape and the cutting requirement of the gear, and the burden of the too large cutting depth on a tool and a workpiece during single cutting is relieved. By designing a plurality of steps, the cutting amount of each stage can be gradually increased or reduced, and vibration and cutter damage caused by the too large cutting amount are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gear cutting equipment, and particularly relates to a gear cutting and forming machine tool. Background Art

[0002] A gear cutting and forming machine tool is a machine tool device specifically used for producing gears, and can efficiently process the outer shape and tooth profile accuracy of gears. The machine tool processes the contour of the gear by using specific tools and processing techniques, and uses the cutting and forming method. Common gear cutting methods include gear milling, gear shaping, shaving, etc.

[0003] In a Chinese patent (publication number: CN119566421A), there is disclosed a cutting machine tool for precision gear processing with automatic tool setting, including a cutting table. An installation through groove is formed in the middle of the cutting table, and a placement frame is arranged at the lower end of the installation through groove. At the same time, a placement fixing component is arranged inside the placement frame. An installation frame is arranged at the upper end of the cutting table, and a surface detector is arranged above the placement fixing component on the inner side of the upper end of the installation frame. At the same time, a bidirectional motor is arranged in the middle of the top of the upper end of the installation frame. One output end of the bidirectional motor is connected to a cutting component, and the cutting component includes a cutting tool. At the same time, a threaded column is threadedly connected in the middle of the cutting tool. The top of the threaded column is connected to the middle of the lower end of the lifting top plate. Both sides of the lifting top plate are respectively connected to the installation frame and the fixed vertical plate through symmetrically arranged moving guide rails. At the same time, the top of the lifting top plate is rotationally connected to a side column arranged on one side of an eccentric turntable through a lifting adjustment component; the placement fixing component includes a positioning base, and a rotating seat is arranged inside the upper end of the positioning base. At the same time, both sides of the upper end of the rotating seat are connected to both sides of the insertion cylinder through symmetrically arranged support connection columns. An installation insert is snap-fitted in the middle of the insertion cylinder, and the outer side of the upper end of the installation insert is detachably connected to the middle of a workpiece body. At the same time, the lower end of the installation insert is connected to the middle of the upper end of the rotating seat through a clamping and fixing component. The lower end of the rotating seat is connected to a transmission component through a driving connection component, and the transmission component is connected to the other output end of the bidirectional motor.

[0004] The following technical problems exist in the actual use process of this patent and the prior art: This patent mainly uses the gear shaping method to process gears. The same as existing gear shaping cutting equipment, it uses a gear shaper cutter to gradually cut out the tooth profile on the surface of the workpiece. Through the relative movement between the tool and the workpiece, the tooth profile is gradually formed. The gear shaping method can accurately control the tooth profile and size of the gear, and is suitable for gear processing with high-precision requirements. However, in the actual processing process, in traditional one-time deep cutting, a large feed rate may lead to error accumulation. And during multiple shallow cuttings, not only does it affect the cutting efficiency, but also it is easy to cause error accumulation. Especially during high-precision processing, it will affect the gear processing accuracy. At the same time, an excessive cutting depth during single cutting places a burden on the tool and the workpiece, affecting the tool service life. Summary of the Invention

[0005] The object of the present invention is: to solve the above problems, the present invention provides a gear cutting and forming machine tool.

[0006] The present invention specifically adopts the following technical solutions to achieve the above object: A gear cutting and forming machine tool includes a machine tool. A stepped cutting assembly is fixedly installed on the cutting drive of the machine tool. The stepped cutting assembly is composed of a cutting shaft, a fixed cutting tool and a plurality of adjustable cutting tools. The cutting shaft is fixedly installed on the cutting drive, the fixed cutting tool is fixedly installed on the cutting shaft, and the plurality of adjustable cutting tools are slidably connected to the cutting shaft. During cutting, the fixed cutting tool and the plurality of adjustable cutting tools are arranged in a stepped manner. When cutting downward, the fixed cutting tool is closest to the center of the gear to be cut, and when cutting upward, the fixed cutting tool is farthest from the center of the gear to be cut.

[0007] Further, a mounting plate is fixedly installed on the outer side of the cutting shaft. An adjusting motor is arranged on the outer side of the mounting plate. The output end of the adjusting motor is fixedly installed with a driving wheel. Two driven wheels are rotatably installed on the side of the mounting plate away from the cutting shaft. The driving wheel is in transmission connection with the two driven wheels through a toothed transmission belt. A plurality of adjusting lead screws are rotatably installed inside the mounting plate. A transmission gear set is arranged at the end of the adjusting lead screw away from the cutting shaft. The transmission gear set is meshed with the toothed transmission belt. An adjusting nut is arranged at the top of the adjustable cutting tool. The adjusting nut is in threaded connection with the corresponding adjusting lead screw. The thread pitch of the adjusting lead screw increases sequentially from top to bottom.

[0008] Further, the same group of adjustable cutting tools corresponds to two adjusting lead screws, and two adjusting nuts are arranged at the top of the adjustable cutting tool.

[0009] Further, the adjusting motor is slidably connected to the outer side of the mounting plate. A tension spring is arranged between the adjusting motor and the mounting plate. The transmission gear set is composed of a plurality of gears. The radius of each group of gears is different. All the plurality of gears can be meshed with the toothed transmission belt. A sleeve is arranged inside the transmission gear set. A shaft key sliding hole is opened on the inner wall of the sleeve. A sliding shaft is arranged at the end of the adjusting lead screw away from the cutting shaft. The sliding shaft is slidably inserted into the shaft key sliding hole. An electric telescopic rod is fixedly installed on the outer side of the mounting plate. The telescopic end of the electric telescopic rod is fixedly installed with a telescopic connecting piece. The plurality of transmission gear sets are fixedly installed on the telescopic connecting piece through the sleeve at the same time.

[0010] Further, an outer cover is provided on the outer side of the mounting plate. The outer cover protects the driving wheel, the driven wheel and the transmission gear set inside. A through hole is penetrated and opened inside the outer cover, and the sleeve can pass through the through hole. A sliding port is penetrated and opened inside the outer cover. A spreading drive shaft is rotatably installed above the outer side of the outer cover. The spreading drive shaft is driven by a motor. Helical grooves with opposite helix directions are opened at both ends of the spreading drive shaft. A spreading guide post is fixedly installed below the outer side of the outer cover. Two groups of spreading members are sleeved on the outer side of the spreading guide post. The two groups of spreading members are respectively threadedly connected to the helical grooves at both ends of the spreading drive shaft. A plurality of spreading sliding rods are provided on one side of the spreading member close to the mounting plate. The spreading sliding rods penetrate through the sliding port and extend to the inner side of the toothed transmission belt. The transmission gear set is located between adjacent spreading sliding rods.

[0011] Further, a rectangular guide groove is opened inside the adjustable cutting tool. Four guiding planes are annularly arranged on the outer surface of the cutting shaft. The four guiding planes are attached to the inner wall of the rectangular guide groove.

[0012] Further, an inner rotating groove is opened at the top of the adjustable cutting tool. A rotating ring is rotatably installed inside the inner rotating groove. The adjusting nut is welded to the rotating ring. A hoop is provided on the outer side of the mounting plate. An installation groove is opened on the outer surface of the cutting shaft. The hoop is fixedly installed in the installation groove.

[0013] Further, a plurality of positioning threaded grooves are opened on the outer surface of the cutting shaft. A positioning nut is threadedly connected to the outer side of the positioning threaded groove. The adjustable cutting tool is located between adjacent positioning nuts.

[0014] Further, a connecting sleeve is installed on the outer surface of the positioning nut. One end of the adjusting lead screw close to the cutting shaft is rotatably installed in the connecting sleeve.

[0015] The beneficial effects of the present invention are as follows: The present invention adopts segmented cutting. According to the geometric shape and cutting requirements of the gear, a large cutting amount can be divided into multiple small cutting steps, reducing the burden on the tool and the workpiece caused by too large a cutting depth during a single cutting. By designing multiple steps, the cutting amount at each stage can be gradually increased or decreased, thereby controlling the generation of cutting force and heat, and effectively avoiding vibration and tool damage caused by too large a cutting amount.

[0016] The present invention can reduce the error of each feed through the stepped segmented cutting method. Especially in high-precision machining, this method helps to maintain the tooth profile accuracy and pitch uniformity of the gear.

[0017] Through the setting of the adjusting component, the present invention can automatically change the shape of the cutting tool during cutting, with high cutting efficiency. At the same time, the stepped cutting depth can be adjusted according to requirements, and the cutting difference between adjacent cutting tools can be changed, with a wide range of applications. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the schematic diagram of the stepped cutting assembly of the present invention cutting downward; Figure 3 is the schematic diagram of the stepped cutting assembly of the present invention cutting upward; Figure 4 is the exploded view of the stepped cutting assembly of the present invention; Figure 5 is the exploded schematic diagram of the adjusting assembly of the present invention; Figure 6 is the structural schematic diagram of the transmission gear set of the present invention.

[0019] Reference numerals: 1, machine tool; 2, cutting shaft; 21, guiding plane; 22, positioning threaded groove; 23, mounting groove; 3, fixed cutting tool; 4, adjustable cutting tool; 41, rectangular guiding groove; 42, inner rotating groove; 43, rotating ring; 44, adjusting nut; 5, positioning nut; 51, connecting sleeve; 6, mounting plate; 61, hoop; 62, outer housing; 63, through hole; 64, sliding opening; 65, spreading drive shaft; 66, spreading guide post; 67, spreading member; 68, spreading slide bar; 69, electric telescopic rod; 7, adjusting lead screw; 71, sliding shaft; 8, adjusting motor; 81, tension spring; 82, driving wheel; 83, driven wheel; 9, telescopic connecting member; 91, sleeve; 92, transmission gear set; 93, shaft key sliding hole. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] In Embodiment 1, as Figures 1-6 shown, a gear cutting and forming machine tool includes a machine tool 1. A stepped cutting assembly is fixedly installed on the cutting drive of the machine tool 1. The stepped cutting assembly is composed of a cutting shaft 2, a fixed cutting tool 3 and multiple groups of adjustable cutting tools 4. The cutting shaft 2 is fixedly installed on the cutting drive. The fixed cutting tool 3 is fixedly installed on the cutting shaft 2. Multiple groups of adjustable cutting tools 4 are slidably connected to the cutting shaft 2. During cutting, the fixed cutting tool 3 and multiple groups of adjustable cutting tools 4 are distributed in a stepped manner. When cutting downward, the fixed cutting tool 3 is closest to the center of the gear to be cut. When cutting upward, the fixed cutting tool 3 is farthest from the center of the gear to be cut.

[0022] During machining, when cutting downward, the fixed cutting tool 3 and multiple groups of adjustable cutting tools 4 are distributed in a stepped manner, and the fixed cutting tool 3 is closest to the center of the gear to be cut as shown in the attached Figure 2As shown, the adjustable cutting tool 4 at the bottom first participates in cutting, and then the cutting depth is increased step by step in a stepped manner. When cutting upward, the adjustable cutting tool 4 slides relative to the cutting shaft 2. The fixed cutting tool 3 and multiple groups of adjustable cutting tools 4 are distributed in a stepped manner. The fixed cutting tool 3 is the farthest from the center of the gear to be cut. As shown in the appendix Figure 3 As shown, at this time, the feed slide on the machine tool 1 controls the gear feed, and stepped cutting is performed again.

[0023] The present invention adopts segmented cutting. According to the geometric shape and cutting requirements of the gear, a large cutting amount can be divided into multiple small cutting steps, reducing the burden on the tool and workpiece caused by excessive cutting depth during a single cutting. By designing multiple steps, the cutting amount at each stage can be gradually increased or decreased, thereby controlling the generation of cutting force and heat, and effectively avoiding vibration and tool damage caused by excessive cutting amount.

[0024] Reducing cutting errors: Through the stepped segmented cutting method, the error of each feed can be reduced. Especially during high-precision machining, this method helps to maintain the tooth profile accuracy and pitch uniformity of the gear.

[0025] Reducing the error caused by the feed rate: Usually, a smaller feed rate can effectively reduce the thermal deformation and cutting force during cutting, thereby ensuring the machining accuracy. Through the stepped cutting design, the feed rate can be gradually adjusted to avoid unstable machining results caused by excessive cutting force. In traditional one-time deep cutting and multiple shallow cuttings, the feed rate will cause error accumulation. The segmented cutting can reduce this error accumulation by controlling the depth and feed rate of each cutting stage, thereby improving the machining accuracy.

[0026] Embodiment 2, on the basis of the above embodiment, further includes that an installation plate 6 is fixedly installed on the outer side of the cutting shaft 2. An adjusting motor 8 is arranged on the outer side of the installation plate 6. The output end of the adjusting motor 8 is fixedly installed with a driving wheel 82. Two driven wheels 83 are rotatably installed on the side of the installation plate 6 away from the cutting shaft 2. The driving wheel 82 is in transmission connection with the two driven wheels 83 through a toothed transmission belt. A plurality of adjusting lead screws 7 are rotatably installed inside the installation plate 6. A transmission gear set 92 is arranged at one end of the adjusting lead screw 7 away from the cutting shaft 2. The transmission gear set 92 is meshed with the toothed transmission belt. An adjusting nut 44 is arranged on the top of the adjustable cutting tool 4. The adjusting nut 44 is in threaded connection with the corresponding adjusting lead screw 7. The thread pitch of the adjusting lead screw 7 increases sequentially from top to bottom.

[0027] After the downward cutting is completed, control the adjustment motor 8 to operate. The adjustment motor 8 drives the driving wheel 82 to rotate. The driving wheel 82 drives a plurality of transmission gear sets 92 to rotate simultaneously through a toothed transmission belt. The transmission gear sets 92 drive a plurality of adjustment lead screws 7 to rotate synchronously at the same time. The adjustment lead screws 7 drive the adjustable cutting tool 4 to move towards the gear to be machined through the adjustment nuts 44. Since the thread pitch of the adjustment lead screws 7 increases sequentially from top to bottom, the adjustable cutting tool 4 at the lowermost position moves the farthest distance, and the moving distances decrease sequentially from bottom to top, thereby completing the stepped switching. At this time, upward cutting can be carried out, with simple control and high control efficiency.

[0028] Embodiment 3, on the basis of the above embodiment, further includes that each group of adjustable cutting tools 4 corresponds to two adjustment lead screws 7, and two adjustment nuts 44 are arranged at the top of the adjustable cutting tool 4.

[0029] By adopting the design of double adjustment lead screws 7, the movement of the adjustable cutting tool 4 is more stable.

[0030] Embodiment 4, on the basis of the above embodiment, further includes that the adjustment motor 8 is slidably connected to the outside of the mounting plate 6. A tension spring 81 is arranged between the adjustment motor 8 and the mounting plate 6. The transmission gear set 92 is composed of multiple groups of gears, and the radius of each group of gears is different. Multiple groups of gears can all mesh with the toothed transmission belt. A sleeve 91 is arranged inside the transmission gear set 92. A shaft key sliding hole 93 is opened on the inner wall of the sleeve 91. One end of the adjustment lead screw 7 far away from the cutting shaft 2 is provided with a sliding shaft 71. The sliding shaft 71 is slidably inserted into the shaft key sliding hole 93. An electric telescopic rod 69 is fixedly installed on the outside of the mounting plate 6. The telescopic end of the electric telescopic rod 69 is fixedly installed with a telescopic connecting piece 9. Multiple groups of transmission gear sets 92 are fixedly installed on the telescopic connecting piece 9 through the sleeves 91 at the same time.

[0031] Furthermore, an outer cover 62 is arranged on the outside of the mounting plate 6. The outer cover 62 protects the driving wheel 82, the driven wheel 83 and the transmission gear set 92 inside. A through hole 63 is penetrated and opened inside the outer cover 62, and the sleeve 91 can pass through the through hole 63. A sliding port 64 is penetrated and opened inside the outer cover 62. A spreading drive shaft 65 is rotatably installed above the outside of the outer cover 62. The spreading drive shaft 65 is driven by a motor. Helical grooves with opposite helix directions are opened at both ends of the spreading drive shaft 65. A spreading guide post 66 is fixedly installed below the outside of the outer cover 62. Two spreading pieces 67 are sleeved on the outside of the spreading guide post 66. The two spreading pieces 67 are respectively threadedly connected to the helical grooves at both ends of the spreading drive shaft 65. Multiple spreading sliding rods 68 are arranged on one side of the spreading piece 67 close to the mounting plate 6. The spreading sliding rods 68 penetrate through the sliding port 64 and extend to the inner side of the toothed transmission belt. The transmission gear set 92 is located between adjacent spreading sliding rods 68.

[0032] When it is necessary to adjust the step cutting depth and change the cutting difference of adjacent cutting tools, the expansion drive shaft 65 rotates first under the action of the motor, and the expansion drive shaft 65 drives the two sets of expansion parts 67 to move away from each other. The two sets of expansion parts 67 expand the toothed transmission belts meshing with the transmission gear set 92 through the expansion slide bar 68. Since the transmission gear set 92 is located between the adjacent expansion slide bars 68, the toothed transmission belts will move away from the transmission gear set 92. At the same time, the toothed transmission belt drives the adjustment motor 8 to descend through the driving wheel 82. The adjustment motor 8 squeezes the tensioning spring 81, and then the electric telescopic rod 69 runs, and the electric The movable telescopic rod 69 drives multiple groups of transmission gear sets 92 to move simultaneously through the telescopic connecting piece 9, and the gears of other radii on the transmission gear set 92 move to the position of the toothed transmission belt. At this time, the expansion drive shaft 65 is reversed, and the expansion piece 67 is closed. The toothed transmission belt meshes with the switched gear under the action of the tensioning spring 81, and the single sliding distance of the adjustable cutting tool 4 is changed. By matching the corresponding number of gear teeth with the corresponding pitch of the adjusting screw 7, the step uniformity can be achieved, ensuring that the cutting depth difference of adjacent cutting tools is the same, and then the cutting depth difference can be automatically adjusted, which is suitable for different gear processing.

[0033] Embodiment 5, based on the above embodiment, further includes: a rectangular guide groove 41 is opened inside the adjustable cutting tool 4, and four guide planes 21 are annularly arranged on the outer surface of the cutting shaft 2, and the four guide planes 21 are in contact with the inner wall of the rectangular guide groove 41.

[0034] Through the design of this embodiment, the stability of the adjustable cutting tool 4 during the cutting process can be improved, and the adjustable cutting tool 4 will not rotate.

[0035] Embodiment 6, on the basis of the above embodiment, further includes: an inner rotation groove 42 is opened on the top of the adjustable cutting tool 4, a swivel 43 is rotatably installed inside the inner rotation groove 42, an adjusting nut 44 is welded to the swivel 43, a clamp 61 is arranged on the outer side of the mounting plate 6, an outer surface of the cutting shaft 2 is opened with a mounting groove 23, and the clamp 61 is fixedly installed in the mounting groove 23.

[0036] Through this design, the position of the mounting plate 6 can be changed so that the mounting plate 6 can be rotated to any position of the cutting tool without affecting the adjustment, and any surface of the cutting tool can be used for cutting.

[0037] Embodiment 7, based on the above embodiment, further includes that the outer surface of the cutting shaft 2 is provided with multiple groups of positioning thread grooves 22, the outer side threads of the positioning thread grooves 22 are connected with positioning nuts 5, and the adjustable cutting tool 4 is located between adjacent positioning nuts 5, which is convenient for disassembly and assembly and convenient for replacing the tool.

[0038] Further, a connecting sleeve 51 is installed on the outer surface of the positioning nut 5, and one end of the adjusting lead screw 7 close to the cutting shaft 2 is rotatably installed in the connecting sleeve 51. Through this design, the transmission stability of the adjusting lead screw 7 can be improved, but the adjustment angle of the mounting plate 6 is affected, and it can be selected for installation according to actual usage requirements.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gear cutting and forming machine tool, comprising a machine tool (1), characterized in that, A stepped cutting component is fixedly installed on the cutting drive of the machine tool (1). The stepped cutting component is composed of a cutting shaft (2), a fixed cutting tool (3) and multiple groups of adjustable cutting tools (4). The cutting shaft (2) is fixedly installed on the cutting drive, the fixed cutting tool (3) is fixedly installed on the cutting shaft (2), and multiple groups of adjustable cutting tools (4) are slidably connected to the cutting shaft (2). During cutting, the fixed cutting tool (3) and multiple groups of adjustable cutting tools (4) are arranged in a stepped manner. When cutting downward, the fixed cutting tool (3) is closest to the center of the gear to be cut, and when cutting upward, the fixed cutting tool (3) is farthest from the center of the gear to be cut.

2. The gear cutting and forming machine tool according to claim 1, characterized in that An installation plate (6) is fixedly installed on the outer side of the cutting shaft (2). An adjustment motor (8) is arranged on the outer side of the installation plate (6). The output end of the adjustment motor (8) is fixedly installed with a driving wheel (82). Two driven wheels (83) are rotatably installed on one side of the installation plate (6) away from the cutting shaft (2). The driving wheel (82) is in transmission connection with the two driven wheels (83) through a toothed transmission belt. A plurality of adjustment lead screws (7) are rotatably installed inside the installation plate (6). A transmission gear set (92) is arranged at one end of the adjustment lead screw (7) away from the cutting shaft (2). The transmission gear set (92) is engaged with the toothed transmission belt. An adjustment nut (44) is arranged at the top of the adjustable cutting tool (4). The adjustment nut (44) is in threaded connection with the corresponding adjustment lead screw (7). The thread pitch of the adjustment lead screw (7) increases sequentially from top to bottom.

3. The gear cutting and forming machine tool according to claim 2, wherein, The same group of adjustable cutting tools (4) corresponds to two adjustment lead screws (7), and two adjustment nuts (44) are arranged at the top of the adjustable cutting tool (4).

4. A gear cutting and forming machine tool according to claim 2, characterized in that, The adjustment motor (8) is slidably connected to the outer side of the installation plate (6). A tension spring (81) is arranged between the adjustment motor (8) and the installation plate (6). The transmission gear set (92) is composed of multiple groups of gears. The radius of each group of gears is different, and multiple groups of gears can be engaged with the toothed transmission belt. A sleeve (91) is arranged inside the transmission gear set (92). A shaft key sliding hole (93) is opened on the inner wall of the sleeve (91). A sliding shaft (71) is arranged at one end of the adjustment lead screw (7) away from the cutting shaft (2). The sliding shaft (71) is slidably inserted into the shaft key sliding hole (93). An electric telescopic rod (69) is fixedly installed on the outer side of the installation plate (6). The telescopic end of the electric telescopic rod (69) is fixedly installed with a telescopic connecting piece (9). Multiple groups of transmission gear sets (92) are fixedly installed on the telescopic connecting piece (9) through the sleeve (91) at the same time.

5. A gear cutting and forming machine tool according to claim 4, characterized in that, An outer cover (62) is provided on the outer side of the mounting plate (6). The outer cover (62) protects the driving wheel (82), the driven wheel (83) and the transmission gear set (92) inside. A through hole (63) is formed through the inside of the outer cover (62), and the sleeve (91) can pass through the through hole (63). A sliding opening (64) is formed through the inside of the outer cover (62). A spreading drive shaft (65) is rotatably installed above the outer side of the outer cover (62). The spreading drive shaft (65) is driven by a motor. Helical grooves with opposite helix directions are formed at both ends of the spreading drive shaft (65). A spreading guide post (66) is fixedly installed below the outer side of the outer cover (62). Two groups of spreading members (67) are sleeved on the outer side of the spreading guide post (66). The two groups of spreading members (67) are respectively threadedly connected to the helical grooves at both ends of the spreading drive shaft (65). A plurality of spreading slide rods (68) are provided on the side of the spreading member (67) close to the mounting plate (6). The spreading slide rods (68) penetrate through the sliding opening (64) and extend to the inner side of the toothed transmission belt. The transmission gear set (92) is located between adjacent spreading slide rods (68).

6. The gear cutting and forming machine tool according to claim 5, wherein, A rectangular guide groove (41) is formed inside the adjustable cutting tool (4). Four guide planes (21) are annularly arranged on the outer surface of the cutting shaft (2). The four guide planes (21) are in contact with the inner wall of the rectangular guide groove (41).

7. A gear cutting and forming machine tool according to claim 6, characterized in that, An inner rotation groove (42) is formed at the top of the adjustable cutting tool (4). A rotating ring (43) is rotatably installed inside the inner rotation groove (42). An adjusting nut (44) is welded to the rotating ring (43). A hoop (61) is provided on the outer side of the mounting plate (6). An installation groove (23) is formed on the outer surface of the cutting shaft (2). The hoop (61) is fixedly installed in the installation groove (23).

8. A gear cutting and forming machine tool according to claim 7, characterized in that, A plurality of positioning threaded grooves (22) are formed on the outer surface of the cutting shaft (2). A positioning nut (5) is threadedly connected to the outside of the positioning threaded groove (22). The adjustable cutting tool (4) is located between adjacent positioning nuts (5).

9. A gear cutting and forming machine tool according to claim 8, characterized in that A connecting sleeve (51) is installed on the outer surface of the positioning nut (5). One end of the adjusting lead screw (7) close to the cutting shaft (2) is rotatably installed in the connecting sleeve (51).

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