Equipment and method for machining large-length-diameter-ratio internal threads through whirlwind thread milling cutter

Abstract

The invention relates to equipment and a method for machining an internal thread with a large length-diameter ratio by adopting a whirlwind thread milling cutter. The technical problem that machining efficiency and precision are affected due to the fact that the length-diameter ratio of an existing workpiece is large is solved. Comprising a stand column vertically arranged on a lathe bed, a horizontal sliding seat is vertically and movably arranged on one side of the stand column through a sliding seat lifting assembly, a spindle device is horizontally and movably arranged on one side of the horizontal sliding seat through a spindle translation mechanism, and the spindle device is provided with a clamping assembly used for clamping cylindrical workpieces which are vertically distributed; a whirlwind thread milling cutter is arranged above the main shaft device, the whirlwind thread milling cutter is arranged on an electric main shaft assembly, and a main shaft tip assembly is arranged below the main shaft device through a tip lifting assembly. The device has the advantages that the radial distance between a workpiece and the milling cutter is adjusted through movement linkage of the sliding seat lifting assembly, the main shaft translation mechanism and the tip lifting assembly, it is ensured that the milling cutter can accurately cut into the complex position on the inner side of the workpiece, meanwhile, large-length-diameter-ratio internal threads can be machined, and limitation of traditional machining is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of thread processing equipment, and in particular relates to an equipment and method for processing internal threads with a large aspect ratio by using a whirlwind thread milling cutter. Background Art

[0002] In mechanical manufacturing, the processing of large aspect ratio internal threads has always been an industry challenge, and the quality of the processing before heat treatment has a significant impact on the performance of the final product. In existing technologies, turning and tapping are mostly used for this type of internal thread processing. However, due to the large aspect ratio of the workpiece, existing processes have significant drawbacks: during turning, the long tool overhang results in insufficient rigidity, causing vibration, and frequent chip entanglement, which not only significantly reduces processing efficiency but also makes it difficult to achieve thread accuracy standards. During tapping, the deep internal hole lacks effective support for the tap, causing it to deviate, and poor chip evacuation results in substandard surface roughness. Summary of the Invention

[0003] The object of the present invention is to solve the above problems and provide a device for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter.

[0004] Another object of the present invention is to provide a method for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter in order to address the above-mentioned problem.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a device for processing internal threads with a large aspect ratio using a cyclone thread milling cutter, comprising a column vertically arranged on a bed, a horizontal slide being vertically movable on one side of the column through a slide lifting assembly, a spindle device being horizontally movable on one side of the horizontal slide through a spindle translation mechanism, the spindle device having a clamping assembly for clamping vertically distributed and cylindrical workpieces, a cyclone thread milling cutter being vertically arranged above the spindle device and being able to penetrate into the inner side of the workpiece when the horizontal slide is vertically lifted, the cyclone thread milling cutter being installed on an electric spindle assembly located on one side of the upper end of the column and the cyclone thread milling cutter being able to rotate circumferentially under the drive of the electric spindle assembly, a spindle top assembly being able to vertically pass through the workpiece and rest against the lower end of the cyclone thread milling cutter and being able to rotate synchronously circumferentially when the cyclone thread milling cutter rotates circumferentially through a top lifting assembly being provided below the spindle device. The slide lifting assembly controls the horizontal slide to drive the workpiece up and down, realizing the feeding of the cyclone thread milling cutter along the axis of the workpiece. The spindle translation mechanism can adjust the radial distance between the spindle device and the cyclone thread milling cutter to meet the processing requirements of internal threads of different diameters. The top lifting assembly can synchronously adjust the height of the spindle top assembly to ensure that the top body is always aligned with the top hole of the cyclone thread milling cutter. At the same time, the vertically set workpiece is conducive to the discharge of processed iron chips.

[0006] In the aforementioned equipment for machining large aspect ratio internal threads using a cyclone thread milling cutter, the cyclone thread milling cutter can be any of a single-thread thread milling cutter, a three-thread thread milling cutter, and a full-thread thread milling cutter. The cyclone thread milling cutter can be flexibly selected based on different thread machining requirements, thereby improving the versatility of the equipment.

[0007] In the aforementioned equipment for machining large aspect ratio internal threads using a cyclone thread milling cutter, the cyclone thread milling cutter comprises a cutter shank, one end of which has a cutter shank connected to an electric spindle assembly. At least one cutter blade is disposed circumferentially outwardly on the end of the shank distal from the cutter shank. The outer side of the shank has a plurality of spiral grooves distributed circumferentially and arranged in a spiral pattern. The spiral grooves are evenly distributed and extend throughout the cutter blade. The spiral groove design, combined with the installation of the spindle assembly, optimizes cutting fluid flow and chip removal, reduces wear on the cyclone thread milling cutter, and improves machining efficiency and surface quality.

[0008] In the aforementioned equipment for machining internal threads with a high aspect ratio using a whirling thread milling cutter, the cutter shank has a tapered center hole at the end face, distal to the cutter shank. This tapered center hole, in conjunction with the spindle center assembly, allows for precise centering of the whirling thread milling cutter and the workpiece, enhancing rigidity during machining and preventing vibrations caused by the large aspect ratio.

[0009] 7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod. said linking rod is pivotally connected to said linking rod. said linking rod is pivotally connected to said linking rod. The two solutions of electric spindle direct drive and belt drive provide diversified driving modes and improve adaptability. The structure of slide translation screw and slide translation screw nut is adopted. The horizontal displacement of the spindle is accurately controlled by the translation screw motor, and the dual horizontal guide rails are used to ensure the relative position accuracy of the tornado thread milling cutter and the workpiece. It is suitable for micro-control of radial feed in internal thread processing.

[0010] In the aforementioned equipment for machining large aspect ratio internal threads using a whirlwind thread milling cutter, the electric spindle assembly includes a grinding spindle seat fixedly mounted on one side of the upper end of a column. The electric spindle body is mounted on one side of the grinding spindle seat, and the cutter shank of the whirlwind thread milling cutter is mounted on the spindle rotating portion at the lower end of the electric spindle body. The electric spindle assembly is fixed to the upper end of the column via the grinding spindle seat, shortening the transmission chain and reducing vibration, making it suitable for high-speed cutting.

[0011] In the above-mentioned equipment for machining internal threads with a large aspect ratio using a cyclone thread milling cutter, the spindle tip assembly includes a tip seat, the upper end of which is provided with a spindle tip seat, and a tip body corresponding to the tip hole is vertically provided on the spindle tip seat; two vertical guide rails arranged parallel to each other are vertically provided on one side of the column, the horizontal slide is vertically slidably provided on the vertical guide rails, and the lower end of the horizontal slide is provided with a tailstock slide slidably connected to the vertical guide rails, and the tip seat is provided on one side of the tailstock slide. The tip seat is integrated into the tailstock slide and is linked to the slide lifting assembly through the vertical guide rails to ensure that the tip body and the cyclone thread milling cutter rise and fall synchronously, maintaining the centering accuracy during the machining process.

[0012] In the above-mentioned equipment for processing internal threads with a large aspect ratio using a tornado thread milling cutter, the slide lifting assembly includes a slide lifting screw rod vertically arranged between two vertical guide rails, the upper end of the slide lifting screw rod is connected to the slide lifting motor arranged at the upper end of the column, and a slide lifting screw rod nut connected to the horizontal slide is sleeved on the slide lifting screw rod.

[0013] In the aforementioned equipment for machining large aspect ratio internal threads using a cyclone thread milling cutter, the center lift assembly includes a center lift screw vertically positioned between two vertical guide rails. The lower end of the center lift screw is connected to a center lift motor mounted at the lower end of a column. A center lift screw nut, which is connected to the tailstock slide, is sleeved onto the center lift screw. This screw and nut transmission structure, combined with a servo motor, enables precise control of the vertical displacement of the spindle assembly and the center lift assembly, meeting the requirements for progressive entry when machining workpieces with large aspect ratios.

[0014] A method for machining an internal thread with a large aspect ratio using a whirlwind thread milling cutter, characterized in that the method comprises the following steps:

[0015] S1: The spindle translation mechanism drives the spindle device to move horizontally to the bottom of the cyclone thread milling cutter, and the top lifting assembly drives the spindle top assembly to pass through the workpiece and abut against the lower end of the cyclone thread milling cutter;

[0016] S2: The electric spindle assembly drives the cyclone thread milling cutter to rotate and the spindle top assembly to rotate synchronously. The slide lifting assembly drives the spindle device to move upward so that the cyclone thread milling cutter penetrates into the inner side of the workpiece. At the same time, the spindle device drives the workpiece to rotate, and the cyclone thread milling cutter mills the internal thread on one side of the workpiece. If secondary milling is required, the slide lifting assembly drives the spindle device to move downward and the spindle translation mechanism drives the spindle device to move horizontally so that the cyclone thread milling cutter moves to the other side of the workpiece to repeat the above-mentioned internal thread milling process.

[0017] Compared with the existing technology, the advantages of the present invention are:

[0018] 1. The device achieves precise positioning of the spindle device, cyclone thread milling cutter and spindle center assembly through the motion linkage of the slide lifting assembly, spindle translation mechanism and center lifting assembly, adjusts the radial distance between the workpiece and the milling cutter, ensures that the milling cutter can accurately cut into the complex position inside the workpiece, and can also be used for processing internal threads with large aspect ratios, avoiding the limitations of traditional processing.

[0019] 2. The device can automatically center through the cooperation between the center body and the center hole, ensuring the coaxiality of the workpiece and the milling cutter, enhancing the rigidity during the processing, and avoiding vibration problems caused by the large aspect ratio.

[0020] 3. This device sets the workpiece vertically and, in conjunction with the spiral groove of the cyclone thread milling cutter, can enhance chip removal capabilities and avoid tool wear or workpiece scratches caused by chip accumulation during deep hole machining.

[0021] 4. The device adopts the method of rotating the whirlwind thread milling cutter and the workpiece to make the thread more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the bed and the column in the present invention.

[0024] Figure 3 It is a structural sectional view of the spindle device in the present invention.

[0025] Figure 4 It is a structural schematic diagram of the electric spindle assembly in the present invention.

[0026] Figure 5 It is a structural schematic diagram of the spindle top assembly in the present invention.

[0027] Figure 6 It is a structural explosion diagram of the main shaft translation mechanism in the present invention.

[0028] Figure 7 It is a structural schematic diagram of the whirlwind thread milling cutter in the present invention.

[0029] In the figure: bed 1, column 11, vertical guide rail 12, slide lifting assembly 2, slide lifting screw 21, slide lifting motor 22, slide lifting screw nut 23, horizontal slide 3, spindle translation mechanism 4, horizontal guide rail 41, horizontal slide 42, slide translation screw 43, translation screw motor 44, slide translation screw nut 45, spindle device 5, clamping assembly 51, spindle base body 52, spindle body 53, spindle drive motor 54, spindle belt 55, Clamping channel 56, tornado thread milling cutter 6, electric spindle assembly 61, milling cutter arbor 62, milling cutter handle 63, milling cutter blade 64, spiral groove 65, center hole 66, grinding spindle seat 67, electric spindle body 68, spindle rotating part 69, center lifting assembly 7, center lifting screw 71, center lifting motor 72, center lifting screw nut 73, spindle center assembly 8, center seat 81, spindle center seat 82, center body 83, tailstock slide 84, workpiece 9. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1-7 As shown, a device for processing internal threads with a large aspect ratio using a cyclone thread milling cutter comprises a column 11 vertically arranged on a bed 1, a horizontal slide 3 is vertically movable on one side of the column 11 through a slide lifting assembly 2, a spindle device 5 is horizontally movable on one side of the horizontal slide 3 through a spindle translation mechanism 4, the spindle device 5 has a clamping assembly 51 for clamping a vertically distributed and cylindrical workpiece 9, a cyclone thread milling cutter 6 is vertically arranged above the spindle device 5 and can penetrate into the inner side of the workpiece 9 when the horizontal slide 3 is vertically lifted and lowered, the cyclone thread milling cutter 6 is installed on an electric spindle assembly 61 located on one side of the upper end of the column 11 and the cyclone thread milling cutter 6 can rotate circumferentially under the drive of the electric spindle assembly 61, and a spindle top assembly 8 is provided below the spindle device 5 through a top lifting assembly 7, which can vertically pass through the workpiece 9 and rest against the lower end of the cyclone thread milling cutter 6 and can rotate synchronously when the cyclone thread milling cutter 6 rotates circumferentially. The slide lifting assembly 2 controls the horizontal slide 3 to drive the workpiece 9 to move up and down, realizing the feeding of the cyclone thread milling cutter 6 along the axis of the workpiece 9. The spindle translation mechanism 4 can adjust the radial distance between the spindle device 5 and the cyclone thread milling cutter 6 to meet the processing requirements of internal threads of different diameters. The top lifting assembly 7 can synchronously adjust the height of the spindle top assembly 8 to ensure that the top body 83 is always aligned with the top hole 66 of the cyclone thread milling cutter 6. At the same time, the vertically arranged workpiece 9 is conducive to the discharge of processed iron chips.

[0032] Combine Figure 4 and Figure 7As shown, the cyclone thread milling cutter 6 is any one of a single-thread thread milling cutter, a three-thread thread milling cutter, and a full-thread thread milling cutter. The cyclone thread milling cutter 6 can be flexibly selected according to different thread processing requirements to improve the versatility of the equipment.

[0033] The cyclone thread milling cutter 6 includes a cutter shank 62, one end of which has a cutter shank 63 connected to the electric spindle assembly 61. At least one cutter blade 64 is provided circumferentially outwardly on the end of the cutter shank 62 away from the cutter shank 63. The outer side of the cutter shank 62 has a plurality of spiral grooves 65 distributed circumferentially and arranged in a spiral pattern. The spiral grooves 65 are evenly distributed and extend through the cutter blade 64. The design of the spiral grooves 65, while also cooperating with the installation of the spindle assembly 5, can optimize the circulation of cutting fluid and the removal of chips, reduce wear on the cyclone thread milling cutter 6, and improve processing efficiency and surface quality.

[0034] Specifically, the end of the milling cutter shank 62, away from the milling cutter handle 63, has a tapered hole 66 at its center. This tapered hole 66, in conjunction with the spindle tip assembly 8, precisely centers the whirling thread milling cutter 6 and the workpiece 9, enhancing rigidity during machining and preventing vibrations caused by a large aspect ratio.

[0035] Combine Figure 1 、 Figure 3 and Figure 6 As shown, the spindle translation mechanism 4 includes two horizontal guide rails 41 horizontally arranged on one side of the horizontal slide 3, a horizontal slide 42 is slidably provided on the horizontal guide rails 41, a slide translation screw 43 is passed through the two horizontal guide rails 41, one end of the slide translation screw 43 is connected to a translation screw motor 44 arranged at one end of the horizontal slide 3, and a slide translation screw nut 45 connected to the horizontal slide 42 is sleeved on the slide translation screw 43; the spindle device 5 is an electric spindle arranged on the horizontal slide 42; or, the spindle device 5 includes a spindle base body 52 arranged on the horizontal slide 42 and a spindle body 53 arranged in the spindle base body 52, and a spindle drive motor 54 fixed on the outside of the spindle base body 52 is provided on one side of the spindle base body 52, and the spindle drive motor 54 is connected to the spindle body 53 through a spindle belt 55, and the clamping assembly 51 is arranged in the clamping channel 56 of the spindle body 53. The two schemes of electric spindle direct drive and belt drive are adopted to diversify the driving modes and improve the adaptability. The structure of the slide translation screw 43 and the slide translation screw nut 45 is adopted. The horizontal displacement of the spindle is accurately controlled by the translation screw motor 44, and the double horizontal guide rails 41 are used for guidance to ensure the relative position accuracy of the tornado thread milling cutter 6 and the workpiece 9. It is suitable for micro-control of radial feed in internal thread processing.

[0036] Combine Figure 1 and Figure 4As shown, the electric spindle assembly 61 includes a grinding spindle seat 67 fixedly mounted on one side of the upper end of the column 11. A motorized spindle body 68 is mounted on one side of the grinding spindle seat 67. The milling cutter shank 63 of the whirlwind thread milling cutter 6 is mounted on a spindle rotating portion 69 at the lower end of the motorized spindle body 68. The electric spindle assembly 61 is fixed to the upper end of the column 11 via the grinding spindle seat 67, shortening the transmission chain and reducing vibration, making it suitable for high-speed cutting.

[0037] Combine Figure 1 and Figure 5 As shown, the spindle tip assembly 8 includes a tip seat 81, with a spindle tip seat 82 disposed at its upper end, and a tip body 83 corresponding to the tip hole 66 vertically disposed on the spindle tip seat 82. Two vertical guide rails 12 disposed parallel to each other are vertically disposed on one side of the column 11. The horizontal slide 3 is vertically slidably disposed on the vertical guide rails 12, and a tailstock slide 84 slidably connected to the vertical guide rails 12 is disposed at the lower end of the horizontal slide 3. The tip seat 81 is disposed on one side of the tailstock slide 84. The tip seat 81 is integrated into the tailstock slide 84 and is linked to the slide lifting assembly 2 via the vertical guide rails 12, ensuring that the tip body 83 and the cyclone thread milling cutter 6 rise and fall synchronously, maintaining centering accuracy during the machining process.

[0038] Combine Figure 1 and Figure 2 As shown, the slide lifting assembly 2 includes a slide lifting screw 21 vertically arranged between two vertical guide rails 12, the upper end of the slide lifting screw 21 is connected to the slide lifting motor 22 arranged at the upper end of the column 11, and a slide lifting screw nut 23 connected to the horizontal slide 3 is sleeved on the slide lifting screw 21.

[0039] The top lift assembly 7 includes a top lift screw 71 vertically mounted between two vertical guide rails 12. The lower end of the top lift screw 71 is connected to a top lift motor 72 mounted at the lower end of the column 11. A top lift screw nut 73 is sleeved on the top lift screw 71 and connected to the tailstock slide 84. The screw and nut transmission structure, combined with a servo motor, enables precise control of the vertical displacement of the spindle unit 5 and the spindle top assembly 8, meeting the requirements of progressive cutting in the machining of workpieces with large aspect ratios.

[0040] A method for machining an internal thread with a large aspect ratio using a whirlwind thread milling cutter, characterized in that the method comprises the following steps:

[0041] S1: The spindle translation mechanism 4 drives the spindle device 5 to move horizontally to the bottom of the cyclone thread milling cutter 6, and the top lifting assembly 7 drives the spindle top assembly 8 to pass through the workpiece 9 and abut against the lower end of the cyclone thread milling cutter 6;

[0042] S2: The electric spindle assembly 61 drives the cyclone thread milling cutter 6 to rotate and rotates synchronously with the spindle top assembly 8. The slide lifting assembly 2 drives the spindle device 5 to move upward so that the cyclone thread milling cutter 6 penetrates into the inner side of the workpiece 9. At the same time, the spindle device 5 drives the workpiece 9 to rotate, and the cyclone thread milling cutter 6 mills the internal thread on one side of the workpiece 9. If secondary milling is required, the slide lifting assembly 2 drives the spindle device 5 to move downward and the spindle translation mechanism 4 drives the spindle device 5 to move horizontally so that the cyclone thread milling cutter 6 is moved to the other side of the workpiece 9 to repeat the above-mentioned milling internal thread process.

[0043] The initial alignment of the cyclone thread milling cutter 6 and the workpiece 9 is achieved through the spindle translation mechanism 4 and the top lifting assembly 7 to ensure the accuracy of the starting point of processing. The electric spindle assembly 61 drives the cyclone thread milling cutter 6 to rotate at high speed, the spindle device 5 drives the workpiece to rotate, and the slide lifting assembly 2 drives the spindle device 5 to achieve axial feed, thereby realizing the internal thread processing of the workpiece 9; during secondary milling, the spindle translation mechanism 4 is used to adjust the position of the spindle device 5. This step can be used for rough milling and fine milling in stages to improve thread accuracy and surface finish, while reducing the single cutting load and extending the tool life. At the same time, the mode of single-side milling plus milling on the other side after displacement can adapt to the processing requirements of different thread depths and complexities, and is especially suitable for segmented processing of internal threads with a large aspect ratio, avoiding the problem of insufficient rigidity caused by excessive tool length.

[0044] The principle of this embodiment is:

[0045] The workpiece 9 is vertically mounted in the spindle device 5, and the spindle translation mechanism 4 drives the spindle device 5 to move horizontally, so that the central axis of the workpiece 9 is vertically aligned with the axis of the cyclone thread milling cutter 6, ensuring that the cyclone thread milling cutter 6 can vertically penetrate the inner side of the workpiece; the top lifting assembly 7 drives the spindle top assembly 8 to rise vertically, and the top body 83 passes through the lower end of the workpiece 9 and is accurately inserted into the top hole 66 of the cyclone thread milling cutter 6, realizing the coaxial positioning of the cyclone thread milling cutter 6 and the top body 83, avoiding vibration or precision deviation caused by eccentricity during processing; the electric spindle assembly 61 drives the cyclone thread milling cutter 6 to rotate circumferentially at high speed, while driving the top body 83 to rotate synchronously, and the spindle device 5 drives the workpiece 9 to rotate; the slide lifts Component 2 drives the horizontal slide 3 to move vertically up and down, so that the cyclone thread milling cutter 6 moves along the axis of the workpiece 9. The milling cutter blade 64 mills the inner wall of the workpiece 9 during high-speed rotation. At the same time, the workpiece 9 rotates synchronously to form a spiral trajectory of the internal thread. The top body 83 always rests against the lower end of the cyclone thread milling cutter 6, supporting the cyclone thread milling cutter 6 to reduce the flexural deformation when the aspect ratio is too large, thereby ensuring the processing accuracy; if secondary milling is required, the slide lifting component 2 first drives the spindle device 5 to move downward, so that the cyclone thread milling cutter 6 withdraws a certain distance from the workpiece 9, and the spindle translation mechanism 4 drives the spindle device 5 to move horizontally, so that the cyclone thread milling cutter 6 is moved to the other side of the workpiece 9, and then the upward feed milling process is repeated.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0047] Although this article uses more of the following: bed 1, column 11, vertical guide rail 12, slide lifting assembly 2, slide lifting screw 21, slide lifting motor 22, slide lifting screw nut 23, horizontal slide 3, spindle translation mechanism 4, horizontal guide rail 41, horizontal slide 42, slide translation screw 43, translation screw motor 44, slide translation screw nut 45, spindle device 5, clamping assembly 51, spindle base body 52, spindle body 53, spindle drive motor 54, spindle belt 55, clamping channel 56 The present invention includes the following terms: , cyclone thread milling cutter 6, electric spindle assembly 61, milling cutter arbor 62, milling cutter shank 63, milling cutter blade 64, spiral groove 65, center hole 66, grinding spindle seat 67, electric spindle body 68, spindle rotating part 69, center lifting assembly 7, center lifting screw 71, center lifting motor 72, center lifting screw nut 73, spindle center assembly 8, center seat 81, spindle center seat 82, center body 83, tailstock slide 84, workpiece 9, etc., but the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A device for machining internal threads with a large aspect ratio using a cyclone thread milling cutter, comprising a column (11) vertically arranged on a bed (1), characterized in that: One side of the column (11) is provided with a horizontal slide (3) for vertical movement through a slide lifting assembly (2), and one side of the horizontal slide (3) is provided with a spindle device (5) for horizontal movement through a spindle translation mechanism (4), and the spindle device (5) has a clamping assembly (51) for clamping a vertically distributed and cylindrical workpiece (9), and a vertically arranged rotary shaft (51) is provided above the spindle device (5) and can penetrate into the inner side of the workpiece (9) when the horizontal slide (3) is vertically lifted. The cyclone thread milling cutter (6) is installed on an electric spindle assembly (61) located on one side of the upper end of a column (11) and the cyclone thread milling cutter (6) can rotate circumferentially under the drive of the electric spindle assembly (61). A spindle top assembly (8) is provided below the spindle device (5) through a top lifting assembly (7) that can vertically pass through a workpiece (9) and abut against the lower end of the cyclone thread milling cutter (6) and can rotate synchronously when the cyclone thread milling cutter (6) rotates circumferentially.

2. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 1, characterized in that: The cyclone thread milling cutter (6) is any one of a single-thread thread milling cutter, a three-thread thread milling cutter and a full-thread thread milling cutter.

3. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 2, characterized in that: The whirlwind thread milling cutter (6) includes a milling cutter rod (62), one end of the milling cutter rod (62) is provided with a milling cutter shank (63) connected to the electric spindle assembly (61), and at least one milling cutter blade (64) is provided on the circumferential outer side of the end of the milling cutter rod (62) away from the milling cutter shank (63), and the outer side of the milling cutter rod (62) has a plurality of spiral grooves (65) distributed circumferentially and arranged in a spiral shape, and the spiral grooves (65) are evenly distributed and distributed throughout the milling cutter blade (64).

4. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 3, characterized in that: The center of the end surface of one end of the milling cutter rod (62) away from the milling cutter handle (63) is provided with a top hole (66), and the top hole (66) is in the shape of a tapered hole.

5. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 1, 2, 3 or 4, characterized in that: The spindle translation mechanism (4) includes two horizontal guide rails (41) arranged horizontally on one side of the horizontal slide (3), a horizontal slide (42) is slidably provided on the horizontal guide rails (41), a slide translation screw (43) is passed through the two horizontal guide rails (41), one end of the slide translation screw (43) is connected to a translation screw motor (44) arranged at one end of the horizontal slide (3), and a slide translation screw nut (45) connected to the horizontal slide (42) is sleeved on the slide translation screw (43); the spindle device (5) is An electric spindle is arranged on a horizontal slide (42); or, the spindle device (5) includes a spindle base body (52) arranged on the horizontal slide (42) and a spindle body (53) arranged in the spindle base body (52), and a spindle drive motor (54) fixed to the outside of the spindle base body (52) is provided on one side of the spindle base body (52), and the spindle drive motor (54) is connected to the spindle body (53) through a spindle belt (55), and the clamping assembly (51) is arranged in a clamping channel (56) of the spindle body (53).

6. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 3, characterized in that: The electric spindle assembly (61) includes a grinding spindle seat (67) fixedly arranged on one side of the upper end of the column (11), an electric spindle body (68) is provided on one side of the grinding spindle seat (67), and the milling cutter shank (63) of the cyclone thread milling cutter (6) is installed on the spindle rotating part (69) at the lower end of the electric spindle body (68).

7. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 4, characterized in that: The spindle top assembly (8) includes a top seat (81), a spindle top seat (82) is provided at the upper end of the top seat (81), and a top body (83) corresponding to the top hole (66) is vertically provided on the spindle top seat (82); two vertical guide rails (12) arranged parallel to each other are vertically provided on one side of the column (11), the horizontal slide (3) is vertically slidably arranged on the vertical guide rail (12), and a tailstock slide (84) slidably connected to the vertical guide rail (12) is provided at the lower end of the horizontal slide (3), and the top seat (81) is arranged on one side of the tailstock slide (84).

8. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 7, characterized in that: The slide lifting assembly (2) includes a slide lifting screw (21) vertically arranged between two vertical guide rails (12), the upper end of the slide lifting screw (21) is connected to a slide lifting motor (22) arranged at the upper end of the column (11), and a slide lifting screw nut (23) connected to the horizontal slide (3) is sleeved on the slide lifting screw (21).

9. The equipment for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 7, characterized in that: The top lifting assembly (7) includes a top lifting screw (71) vertically arranged between two vertical guide rails (12), the lower end of the top lifting screw (71) is connected to the top lifting motor (72) arranged at the lower end of the column (11), and a top lifting screw nut (73) connected to the tailstock slide (84) is sleeved on the top lifting screw (71).

10. The method for machining internal threads with a large aspect ratio using a whirlwind thread milling cutter according to claim 1-9, wherein: This method comprises the following steps: S1: The spindle translation mechanism (4) drives the spindle device (5) to move horizontally to the bottom of the cyclone thread milling cutter (6), and the top lifting assembly (7) drives the spindle top assembly (8) to pass through the workpiece (9) and abut against the lower end of the cyclone thread milling cutter (6); S2: The electric spindle assembly (61) drives the cyclone thread milling cutter (6) to rotate and the spindle top assembly (8) to rotate synchronously, the slide lifting assembly (2) drives the spindle device (5) to move upward so that the cyclone thread milling cutter (6) penetrates into the inner side of the workpiece (9), and at the same time, the spindle device (5) drives the workpiece (9) to rotate, and the cyclone thread milling cutter (6) mills the internal thread on one side of the inside of the workpiece (9). If secondary milling is required, the slide lifting assembly (2) drives the spindle device (5) to move downward, and at the same time, the spindle translation mechanism (4) drives the spindle device (5) to move horizontally so that the cyclone thread milling cutter (6) is moved to the other side of the inside of the workpiece (9) to repeat the above-mentioned milling process of the internal thread.

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