High-precision screw rod thread machining device

Abstract

The high-precision screw rod thread machining device comprises a machine tool body, spindle boxes are symmetrically and fixedly installed on the two sides of the upper surface of the machine tool body, clamping chucks are fixedly installed on the sides, close to each other, of the spindle boxes, and a slide carriage is slidably connected to the upper surface of the middle of the machine tool body; waste generated in the thread machining process of the to-be-machined lead screw is cut off in stages through the cutting tools moving in the opposite directions, so that the situation that a large amount of waste is accumulated at the contact position of the to-be-machined lead screw and the machining tool, in the thread machining process of the lead screw, the tool needs to continuously cut the material, and if the waste is continuously accumulated around the tool, the machining efficiency is high is avoided. After waste materials are cut off stage by stage, the cutter is always in a relatively clean working environment, abnormal abrasion of the cutter caused by accumulation of the waste materials can be reduced, the service life of the cutter is prolonged, and therefore the machining precision and the surface quality of threads are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thread processing, in particular to a high-precision screw thread processing device. Background Art

[0002] Screw thread processing is a process of machining a workpiece using tools for making threads, such as cutting, turning, milling, and grinding. It generally refers to the method of machining threads on a workpiece using forming tools or grinding tools. The main methods include turning, milling, tapping, threading, grinding, lapping, and whirling cutting. In the existing technology, lathes are mostly used for thread processing.

[0003] When the existing technology uses a lathe for thread processing, the forming tool contacts the surface of the high-speed rotating screw to perform thread processing. Cut waste is continuously generated during the processing. Due to the thread processing method, the edges of the cut waste are triangular and sharp, making it difficult to clean during the thread processing process. In addition, the cut waste will accumulate in a curled shape at the contact point between the forming tool and the screw. As the thread processing process proceeds, the curled cut waste will be entangled on the surface of the screw. During the rotation of the screw, the entanglement of the waste will cause uneven force on the surface of the screw. This will cause the screw to vibrate and shake during rotation, thereby affecting the smoothness of the screw movement. This unstable movement will further aggravate the friction and entanglement between the screw and the waste, forming a vicious cycle and affecting the screw thread processing accuracy;

[0004] To this end, we propose a high-precision screw thread processing device to solve the above problems. Summary of the Invention

[0005] Technical problems solved

[0006] In view of this, and in view of the deficiencies in the prior art, the present invention provides a high-precision screw thread processing device to solve the problems raised in the above background technology.

[0007] Technical Solution

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-precision screw thread processing device, comprising a machine tool bed, spindle boxes symmetrically fixedly mounted on both sides of the upper surface of the machine tool bed, clamping chucks fixedly mounted on the sides close to the spindle boxes, a slide slidably connected to the upper surface of the middle part of the machine tool bed, a tool holder base slidably mounted on the upper surface of the slide, a turret tool holder rotatably mounted on one side of the tool holder base, a screw to be processed is commonly inserted and fixed between the two clamping chucks, and a cutting mechanism is also included;

[0009] The cutting mechanism includes a sliding base slidably connected to the upper surface of the machine tool bed. There are three sliding bases, two of which are symmetrically arranged on one side of the machine tool bed, and the other sliding base is arranged on the other side of the sliding base. The upper surfaces of the sliding bases are fixedly connected to support frames, and the tops of the two support frames close to the clamping chuck are rotatably connected to friction rollers. One end of one of the friction rollers is fixedly connected to bevel gear 1, and the outer surface of the top of bevel gear 1 is meshed with bevel gear 2, and the upper surface of bevel gear 2 is fixedly connected to transmission wheel 1. The cutting head is slidably connected to the inside of the support frame, and the outer surface of the bottom end of the cutting head is rotatably connected to a long connecting rod, and the end of the long connecting rod away from the cutting head is rotatably connected to a short connecting rod.

[0010] Preferably, bevel gear 1 and bevel gear 2 are both rotatably connected to the inside of the support frame, and the short connecting rod, long connecting rod and cutting head are symmetrically arranged in two groups with reference to the central axis of the machine tool bed, and a buffer spring is fixedly connected between the cutting head and the support frame.

[0011] Preferably, it further comprises a rotation direction changing mechanism provided on the support frame;

[0012] The rotation direction changing mechanism includes a rotating shaft rotatably connected to a support frame on a side away from the clamping chuck, a driven gear is fixedly connected to the top of the rotating shaft, a meshing gear is meshed with the top surface of the driven gear, a rotating gear is meshed with the top surface of the meshing gear, a transmission wheel 2 is fixedly connected to the upper surface of the rotating gear, and a turntable is fitted on the upper surface of the transmission wheel 2.

[0013] Preferably, a round rod is fixedly connected to the top center of the driven gear, and a hollow sleeve is fixedly connected to the bottom center of the rotating gear. The round rod on the driven gear slides and passes through the hollow sleeve, the rotating gear and the transmission wheel 2 and extends to the top of the transmission wheel 2. The round rod on the driven gear passes through one end of the transmission wheel 2 and is fixedly connected to the bottom surface of the turntable, and the meshing gear is rotatably connected to the outer wall of the support frame.

[0014] Preferably, it further includes a connecting mechanism provided on the upper surface of the machine tool bed;

[0015] The connecting mechanism includes an electrically controlled telescopic rod fixedly connected between two support frames on the same side, a positioning base fixedly connected to the upper surface of one side of the machine tool bed, a slider slidably connected to the inside of the positioning base through a spring telescopic rod, the upper surface of the slider is rotatably connected to the support shaft, the outer surface of the support shaft is symmetrically rotatably connected to the positioning connecting rod, the top end of the support shaft is fixedly connected to the transmission wheel three, and the outer surfaces of the transmission wheel one, the transmission wheel two and the transmission wheel three are jointly connected by a transmission belt.

[0016] Preferably, the positioning base is arranged between two symmetrically arranged sliding bases on the same side, a sliding groove is provided on the upper surface of the positioning base, and the end of the positioning link away from the support shaft is rotatably connected to the outer surface of the support frame.

[0017] Preferably, one group of short connecting rods is rotatably connected to an upper surface of the transmission wheel at one end away from the long connecting rod, and another group of short connecting rods is rotatably connected to an upper surface of the turntable at one end away from the long connecting rod.

[0018] Preferably, it further includes an adjustment mechanism provided on the machine tool bed;

[0019] The adjustment mechanism includes a limiting slide rod fixedly connected between two sliding bases near the clamping chuck side, a bidirectional threaded rod rotatably connected between the two sliding bases near the clamping chuck side, and a stepping motor fixedly connected to the upper surface of one of the sliding bases.

[0020] Preferably, one end of the bidirectional threaded rod passes through and extends to the outside of the sliding base, the output shaft end of the stepper motor is fixedly connected to one end of the bidirectional threaded rod passing through the sliding base, and the outer surfaces of both ends of the bidirectional threaded rod are symmetrically provided with threads, and the thread directions are opposite, and the two support frames close to the clamping chuck side are symmetrically threadedly connected to the two ends of the bidirectional threaded rod, and the two support frames close to the clamping chuck side are both slidably connected to the outer surface of the limiting slide rod.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a high-precision screw thread processing device with the following

[0023] Beneficial effects:

[0024] The waste generated during the thread machining of the screw rod to be machined is cut off in stages by the cutting tools moving in opposite directions, thereby avoiding a large amount of waste accumulation at the contact position between the screw rod to be machined and the machining tool. In the thread machining of the screw rod, the tool needs to continuously cut the material. If the waste continues to accumulate around the tool, it will cause friction and extrusion with the tool, thereby causing tool damage. After the waste is cut off in stages, the tool is always in a relatively clean working environment, which can reduce abnormal wear of the tool caused by waste accumulation, extend the service life of the tool, and thus ensure the machining accuracy and surface quality of the thread; in addition, a large amount of waste accumulation will exert additional pressure on the screw rod, especially when the waste accumulation is uneven, this pressure may cause the screw rod to deform. Timely cutting off of the waste can effectively reduce the pressure of the waste on the screw rod, reduce the risk of screw rod deformation, and ensure that the dimensional accuracy and shape accuracy of the screw rod meet the design requirements;

[0025] By configuring rotating gears, meshing gears, and driven gears, the rotational direction of drive wheels 1 and 2, connected by a transmission belt, can be changed, thereby enabling the two sets of cutting tools to move toward each other. This movement of the two cutting tools shares the cutting load that would otherwise be borne by a single tool. During unidirectional cutting, the tool must overcome significant cutting forces, which can lead to increased tool wear and even damage over extended use. However, with opposing cutting, the cutting force on each tool is reduced, lowering the load on the tools and extending their service life.

[0026] By setting up the bidirectional threaded rod and the limit slide rod, the two friction rollers can adapt to the thread processing of the screw rods of different sizes to be processed, so that the friction rollers can always fit the surface of the screw rod to be processed. This setting enables the processing equipment to process screw rods of various sizes and specifications, which greatly broadens the processing range of the equipment and improves the versatility of the equipment. In addition, the friction rollers fit the surface of the screw rod, which can make the rotation of the screw rod more stable during the processing process, reduce unnecessary vibration and impact, and thus reduce the wear and fatigue between the various components of the equipment.

[0027] By setting the slider, the support shaft and the positioning link, when the distance between the transmission wheel 1, the transmission wheel 2 and the transmission wheel 3 changes, the transmission belt is always kept in a taut state, thereby maintaining the transmission efficiency of the transmission mechanism composed of the transmission wheel 1, the transmission wheel 2, the transmission wheel 3 and the transmission belt, thereby ensuring that when processing screw threads of different sizes, the cutting tool can move stably in opposite directions and continuously complete the processing of processing waste;

[0028] By setting up the support frame and moving the cutting tools in opposite directions, the two sets of cutting tools are always in a position higher than the top end of the screw rod to be processed, and the cutting waste is continuously cut. When the existing technology is performing screw thread processing, the waste at the cutting point will be spirally accumulated on the contact position between the screw rod to be processed and the processing tool. The cutting tool is set above the screw rod to be processed and can directly contact the waste, thereby avoiding the cut waste from being entangled on the surface of the screw rod, affecting the processing accuracy of the screw rod thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall appearance of the present invention;

[0030] Figure 2 For the present invention Figure 1 Another perspective structural diagram;

[0031] Figure 3 A schematic diagram of the positional relationship of the clamping chuck of the present invention;

[0032] Figure 4 For the present invention Figure 3A schematic diagram of the structure at center A;

[0033] Figure 5 Schematic diagram of the connection relationship of the support frame of the present invention;

[0034] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point B in the middle;

[0035] Figure 7 Schematic diagram of the positional relationship of the support shaft of the present invention;

[0036] Figure 8 This is a schematic diagram of the connection relationship at the rotating shaft of the present invention;

[0037] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point C in the middle.

[0038] In the figure: 11, machine bed; 12, spindle box; 13, clamping chuck; 14, slide; 15, tool holder base; 16, turret tool holder; 17, screw to be machined;

[0039] 21. Sliding base; 22. Support frame; 23. Friction roller; 24. Bevel gear 1; 25. Bevel gear 2; 26. Transmission wheel 1; 27. Short connecting rod; 28. Long connecting rod; 29. ​​Cutting head;

[0040] 31. Rotating shaft; 32. Driven gear; 33. Meshing gear; 34. Rotating gear; 35. Second transmission wheel; 36. Rotating disk;

[0041] 41. Electric telescopic rod; 42. Positioning base; 43. Slider; 44. Support shaft; 45. Positioning connecting rod; 46. Drive wheel three; 47. Drive belt;

[0042] 51. Limiting slide rod; 52. Bidirectional threaded rod; 53. Stepping motor. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Embodiments of the Invention

[0045] See also Figures 1 to 9A high-precision screw thread processing device includes a machine tool bed 11, with spindle boxes 12 symmetrically fixedly installed on both sides of the upper surface of the machine tool bed 11, and clamping chucks 13 fixedly installed on the sides close to the spindle boxes 12. A slide 14 is slidably connected to the upper surface of the middle part of the machine tool bed 11, and a tool holder base 15 is slidably installed on the upper surface of the slide 14. A turret tool holder 16 is rotatably installed on one side of the tool holder base 15. A screw rod 17 to be processed is commonly inserted and fixed between the two clamping chucks 13, and also includes a cutting mechanism;

[0046] The cutting mechanism includes a sliding base 21 slidably connected to the upper surface of the machine tool bed 11. There are three sliding bases 21, two of which are symmetrically arranged on one side of the machine tool bed 11, and the other sliding base 21 is arranged on the other side of the sliding base 21. The upper surfaces of the sliding bases 21 are fixedly connected to support frames 22. The two support frames 22 close to the clamping chuck 13 are rotatably connected to the top of the side close to each other with friction rollers 23. One end of one of the friction rollers 23 is fixedly connected to bevel gear 1 24, and the outer surface of the top of bevel gear 1 24 is meshed with bevel gear 25. The upper surface of bevel gear 25 is fixedly connected to transmission wheel 1 26. The inside of the support frame 22 is slidably connected to a cutting head 29, and the outer surface of the bottom end of the cutting head 29 is rotatably connected to a long connecting rod 28. The end of the long connecting rod 28 away from the cutting head 29 is rotatably connected to a short connecting rod 27.

[0047] Among them, bevel gear 1 24 and bevel gear 2 25 are both rotatably connected to the inside of the support frame 22, and the short connecting rod 27, the long connecting rod 28 and the cutting head 29 are all arranged in two groups symmetrically along the central axis of the machine tool bed 11 as a reference. A buffer spring is fixedly connected between the cutting head 29 and the support frame 22.

[0048] Among them, the short connecting rod 27 is rotatably connected to the upper surface of the transmission wheel 1 26 through a round rod set at a position offset from the center of the circle on the upper surface of the transmission wheel 1 26, so the short connecting rod 27 will periodically rotate around the center of the circle of the transmission wheel 1 26 under the action of the transmission wheel 1 26.

[0049] The support frame 22 is slidably connected to the upper surface of the machine tool bed 11 .

[0050] Further embodiments

[0051] See also Figure 5 、 Figure 6 、 Figure 8 and Figure 9 , the high-precision screw thread processing device also includes a rotation direction changing mechanism provided on the support frame 22;

[0052] The rotation direction changing mechanism includes a rotating shaft 31 rotatably connected to the support frame 22 on the side away from the clamping chuck 13, the top of the rotating shaft 31 is fixedly connected to a driven gear 32, the top surface of the driven gear 32 is meshedly connected to a meshing gear 33, the top surface of the meshing gear 33 is meshedly connected to a rotating gear 34, the upper surface of the rotating gear 34 is fixedly connected to a transmission wheel 2 35, and the upper surface of the transmission wheel 2 35 is fitted with a turntable 36.

[0053] Among them, a round rod is fixedly connected to the center of the top of the driven gear 32, and a hollow sleeve is fixedly connected to the center of the bottom surface of the rotating gear 34. The round rod on the driven gear 32 slides and passes through the hollow sleeve, the rotating gear 34 and the transmission wheel 2 35 and extends to the top of the transmission wheel 2 35. The round rod on the driven gear 32 passes through one end of the transmission wheel 2 35 and is fixedly connected to the bottom surface of the turntable 36. The meshing gear 33 is rotatably connected to the outer wall of the support frame 22.

[0054] Further embodiments

[0055] See also Figures 5 to 8 , the high-precision screw thread processing device also includes a connecting mechanism provided on the upper surface of the machine tool bed 11;

[0056] The connecting mechanism includes an electric-controlled telescopic rod 41 fixedly connected between two support frames 22 on the same side, a positioning base 42 is fixedly connected to the upper surface of one side of the machine tool bed 11, a slider 43 is slidably connected to the inside of the positioning base 42 through a spring telescopic rod, the upper surface of the slider 43 is rotatably connected to the support shaft 44, the outer surface of the support shaft 44 is symmetrically rotatably connected to the positioning link 45, the top of the support shaft 44 is fixedly connected to the transmission wheel three 46, and the outer surfaces of the transmission wheel one 26, the transmission wheel two 35 and the transmission wheel three 46 are commonly connected to the transmission belt 47.

[0057] The positioning base 42 is arranged between two symmetrically arranged sliding bases 21 on the same side. A sliding groove is provided on the upper surface of the positioning base 42. The end of the positioning link 45 away from the support shaft 44 is rotatably connected to the outer surface of the support frame 22.

[0058] Among them, one group of short connecting rods 27 is rotatably connected to the upper surface of the transmission wheel 26 at one end away from the long connecting rod 28, and the other group of short connecting rods 27 is rotatably connected to the upper surface of the turntable 36 at one end away from the long connecting rod 28.

[0059] Further embodiments

[0060] See also Figure 5 and Figure 7 , the high-precision screw thread processing device also includes an adjustment mechanism provided on the machine tool bed 11;

[0061] The adjustment mechanism includes a limiting slide rod 51 fixedly connected between the two sliding bases 21 on the side close to the clamping chuck 13, and a bidirectional threaded rod 52 is rotatably connected between the two sliding bases 21 on the side close to the clamping chuck 13, and a stepping motor 53 is fixedly connected to the upper surface of one of the sliding bases 21.

[0062] Among them, one end of the bidirectional threaded rod 52 passes through and extends to the outside of the sliding base 21, the output shaft end of the stepping motor 53 is fixedly connected to one end of the bidirectional threaded rod 52 passing through the sliding base 21, and the outer surfaces of both ends of the bidirectional threaded rod 52 are symmetrically provided with threads, and the thread directions are opposite. The two support frames 22 on the side close to the clamping chuck 13 are symmetrically threadedly connected to the two ends of the bidirectional threaded rod 52, and the two support frames 22 on the side close to the clamping chuck 13 are both slidably connected to the outer surface of the limiting slide rod 51.

[0063] The working process and principle of the above embodiment are as follows:

[0064] Installation of the screw rod 17 to be processed:

[0065] The staff inserts the two ends of the screw rod 17 to be processed into the clamping chuck 13 respectively, and then fixes the two ends of the screw rod 17 to be processed by adjusting the positions of the clamping claws inside the clamping chuck 13.

[0066] Thread processing of the screw rod 17 to be processed:

[0067] After the position of the screw rod 17 to be processed is fixed, the staff installs the thread processing tool head adapted to the thread parameters on the turret tool post 16, and tilts the thread processing tool head at a certain angle according to the designed thread parameters. Then, the staff controls the tool post base 15 and the turret tool post 16 to move above the machine tool bed 11 through the control panel set on the machine tool bed 11, and sets parameters such as the thread profile angle and the tooth side clearance through the control panel, and sets the rotation speed of the spindle box 12 to drive the screw rod 17 to be processed through the clamping chuck 13. Finally, the staff starts the lathe to perform thread processing on the outer surface of the screw rod 17 to be processed;

[0068] It should be noted that in the above process, the lathe completes the processing of the screw thread through its own control panel and the lathe's internal control program, which is all existing technology, so it will not be described in detail here.

[0069] Processing process of thread of screw rod 17 to be processed:

[0070] After the screw rod 17 to be processed is fixed, the staff then starts the stepper motor 53 through the external controller. Since the output shaft end of the stepper motor 53 is fixedly connected to the bidirectional threaded rod 52, the bidirectional threaded rod 52 will rotate inside the sliding base 21 under the action of the stepper motor 53. In addition, since the support frame 22 is slidably connected to the outer surface of the bidirectional threaded rod 52 through the threads provided on the bidirectional threaded rod 52, the threads on the bidirectional threaded rod 52 are symmetrically arranged and the thread directions are opposite, the rotation of the bidirectional threaded rod 52 will drive the support frame 22 threadedly connected to the outer surface of the bidirectional threaded rod 52 to approach each other on the outer surface of the limiting slide rod 51 under the restriction of the limiting slide rod 51 (see details). Figure 5 );

[0071] By setting the bidirectional threaded rod 52 and the limiting slide rod 51, the two friction rollers 23 can adapt to the thread processing of the screw rod 17 to be processed of different sizes, so that the friction rollers 23 can always fit the surface of the screw rod 17 to be processed. This setting enables the processing equipment to process screw rods of various sizes and specifications, which greatly broadens the processing range of the equipment and improves the versatility of the equipment. In addition, the friction rollers 23 fit the surface of the screw rod, which can make the rotation of the screw rod more stable during the processing process, reduce unnecessary vibration and impact, and reduce the wear and fatigue between the various components of the equipment.

[0072] During the above process, since the sliding bases 21 are fixedly connected to the support frames 22, and the support frames 22 are slidably connected to the upper surface of the machine tool bed 11, and the friction rollers 23 are rotatably connected to the support frames 22, as the support frames 22 approach each other, the friction rollers 23 rotatably connected to the support frames 22 will synchronously approach until they come into contact with the outer surface of the screw rod 17 to be processed;

[0073] As the spindle box 12 drives the screw rod 17 to be processed to rotate through the clamping chuck 13, the friction roller 23 in contact with the surface of the screw rod 17 to be processed will rotate under the friction force between the two. At the same time, the bevel gear 1 24 fixedly connected to the friction roller 23 will rotate accordingly, and the bevel gear 1 24 will be driven to rotate by the meshing connection between the bevel gear 1 24 and the bevel gear 2 25. At this time, the transmission wheel 1 26 fixedly connected to the upper surface of the bevel gear 2 25 will also rotate;

[0074] During the above process, the short connecting rod 27 rotatably connected to the upper surface of the transmission wheel 1 26 rotates around the center of the transmission wheel 1 26 and drives the long connecting rod 28 to move through the rotational connection between the short connecting rod 27 and the long connecting rod 28, thereby causing the cutting head 29 slidably connected to the support frame 22 to perform horizontal reciprocating motion on the support frame 22.

[0075] It should be noted that the short connecting rod 27 is rotatably connected to the upper surface of the transmission wheel 1 26 through a round rod provided at a position offset from the center of the upper surface of the transmission wheel 1 26. Therefore, the short connecting rod 27 will periodically rotate around the center of the transmission wheel 1 26 under the action of the transmission wheel 1 26.

[0076] In addition, since the transmission wheel 1 26, the transmission wheel 2 35 and the transmission wheel 3 46 are connected to each other by the transmission belt 47, the rotation of the transmission wheel 1 26 will cause the transmission wheels 2 35 and 3 46 to rotate synchronously under the action of the transmission belt 47. Since the bottom of the transmission wheel 2 35 is fixedly connected to the rotating gear 34, the rotating gear 34 will rotate under the action of the transmission wheel 2 35. Then, through the meshing action of the rotating gear 34 and the meshing gear 33, the meshing gear 33 is caused to rotate on the support frame 22, and finally the driven gear 32 meshed with the meshing gear 33 is rotated.

[0077] Since the top center of the driven gear 32 is fixedly connected with a round rod, and the bottom center of the rotating gear 34 is fixedly connected with a hollow sleeve, the round rod on the driven gear 32 slides and passes through the hollow sleeve, the rotating gear 34 and the transmission wheel 2 35 and extends to the top of the transmission wheel 2 35, the round rod on the driven gear 32 passes through the transmission wheel 2 35 and one end is fixedly connected to the bottom surface of the turntable 36. Therefore, the rotation of the driven gear 32 will drive the turntable 36 to rotate, and finally drive the short connecting rod 27 connected to the turntable 36 at a point deviated from the center to rotate. Through the rotation connection between the short connecting rod 27 and the long connecting rod 28, the cutting head 29 rotatably connected to the other end of the long connecting rod 28 is realized to move horizontally on the support frame 22, thereby realizing the opposite movement of the two groups of cutting heads 29;

[0078] It should be noted that the transmission wheel 1 26, the transmission wheel 2 35 and the transmission wheel 3 46 are connected by the transmission belt 47. Therefore, the rotation directions of the transmission wheels 1 26, the transmission wheels 2 35 and the transmission wheels 3 46 are the same. Therefore, the rotating gear 34 fixedly connected to the bottom end of the transmission wheel 2 35 and the meshing gear 33 meshing with the rotating gear 34 cause the driven gear 32 to rotate in the opposite direction to the rotating gear 34, that is, the rotation direction of the rotating gear 34 is opposite to that of the driven gear 32. Therefore, the turntable 36 fixedly connected to the driven gear 32 will rotate in the opposite direction to the transmission wheel 2 35, thereby causing the short connecting rod 27 rotatably connected on the turntable 36 and the short connecting rod 27 rotatably connected on the transmission wheel 1 26 to rotate in opposite directions, thereby realizing the opposite movement of the cutting head 29.

[0079] As the cutting heads 29 reciprocate and move toward each other, when the turret tool holder 16 is threading the screw rod 17 to be processed, the cut waste will curl up and stay between the screw rod 17 to be processed and the turret tool holder 16. The edges of the cut waste are triangular and sharp. During the threading process of the screw rod 17 to be processed, it rotates at a high speed. The high-speed friction between the processing tool set on the turret tool holder 16 and the screw rod 17 to be processed also generates a lot of heat, making it difficult to clean;

[0080] The waste generated during the thread machining of the screw rod 17 to be machined is cut off in stages by the cutting tools moving in opposite directions, thereby avoiding a large amount of waste accumulation at the contact position between the screw rod 17 to be machined and the machining tool. In the screw rod thread machining, the tool needs to continuously cut the material. If the waste continues to accumulate around the tool, it will cause friction and extrusion with the tool, thereby causing tool damage. After the waste is cut off in stages, the tool is always in a relatively clean working environment, which can reduce abnormal wear of the tool caused by waste accumulation, extend the service life of the tool, and thus ensure the machining accuracy and surface quality of the thread; in addition, a large amount of waste accumulation will exert additional pressure on the screw rod, especially when the waste accumulation is uneven, this pressure may cause the screw rod to deform. Timely cutting off of the waste can effectively reduce the pressure of the waste on the screw rod, reduce the risk of screw rod deformation, and ensure that the dimensional accuracy and shape accuracy of the screw rod meet the design requirements;

[0081] By configuring the rotating gear 34, meshing gear 33, and driven gear 32, the rotational direction of drive wheel 1 26 and drive wheel 2 35, which are connected via the transmission belt 47, can be changed, thereby enabling the two sets of cutting tools to move toward each other. This movement of the two sets of cutting tools shares the cutting load that would otherwise be borne by a single tool. During unidirectional cutting, the tool must overcome a large cutting force, which can easily lead to increased tool wear and even damage over extended use. However, with the use of opposite cutting methods, the cutting force on each tool is reduced, reducing the tool load and thus extending the tool's service life.

[0082] In the process of the slide 14 driving the turret tool holder 16 to move toward the clamping chuck 13, the distance between the two sliding bases 21 on the same side gradually shortens, so the distance between the two support frames 22 will also gradually shorten. At this time, the electric telescopic rod 41 arranged between the two support frames 22 will shorten accordingly, and since the slider 43 is slidably connected to the positioning base 42, the upper surface of the slider 43 is provided with a support shaft 44, and the outer surface of the support shaft 44 is symmetrically connected to the positioning link 45. Therefore, as the distance between the support frames 22 shortens, the distance between the two positioning links 45 will also shorten, thereby pushing the slider 43 connected by the two positioning links 45 to generate horizontal movement on the positioning base 42, that is, move in the direction away from the center of the machine tool bed 11 (see specifically). Figure 7 );

[0083] During the above process, the movement of the slider 43 compresses the spring telescopic rod provided between the slider 43 and the positioning base 42, and as the slider 43 moves, the support shaft 44 provided on the slider 43 moves accordingly, driving the transmission wheel 3 46 fixedly connected to the top end of the support shaft 44 to move in a direction away from the center of the machine tool bed 11;

[0084] Since the transmission wheel 1 26, the transmission wheel 2 35 and the transmission wheel 3 are connected by the transmission belt 47, when one of the sliding bases 21 and the support frame 22 approaches the other sliding base 21 and the support frame 22, the transmission wheel 1 26 and the transmission wheel 2 35 respectively provided on the two support frames 22 will approach each other, and the distance between them will be shortened, and the transmission wheel 3 46 provided on the support shaft 44 moves in the direction away from the center of the machine tool bed 11, which can drive the transmission wheel 3 46 to move away synchronously, so that when the distance between the transmission wheel 1 26, the transmission wheel 2 35 and the transmission wheel 3 46 changes, the transmission belt 47 is always in a taut state, maintaining the transmission efficiency of the transmission mechanism composed of the transmission wheel 1 26, the transmission wheel 2 35, the transmission wheel 3 46 and the transmission belt 47, thereby ensuring that when processing screw threads of different sizes, the cutting tool can move stably in opposite directions and continuously complete the processing of processing waste;

[0085] By setting up the support frame 22 and moving the cutting tools in opposite directions, the two groups of cutting tools are always at a position higher than the top of the screw rod 17 to be processed, and the cutting waste is continuously cut. When the existing technology is performing screw thread processing, the waste at the cutting point will be spirally accumulated on the contact position of the screw rod 17 to be processed and the processing tool. The cutting tool is set above the screw rod 17 to be processed and can directly contact the waste, thereby avoiding the cut waste from being entangled on the surface of the screw rod, affecting the screw rod thread processing accuracy.

[0086] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0087] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision screw thread processing device, comprising a machine tool bed (11), spindle boxes (12) are symmetrically fixedly installed on both sides of the upper surface of the machine tool bed (11), and clamping chucks (13) are fixedly installed on the adjacent sides of the spindle boxes (12), a slide (14) is slidably connected to the upper surface of the middle part of the machine tool bed (11), a tool holder base (15) is slidably installed on the upper surface of the slide (14), a turret tool holder (16) is rotatably installed on one side of the tool holder base (15), and a screw rod (17) to be processed is commonly plugged and fixed between the two clamping chucks (13), characterized in that: Also included is a cutting mechanism; The cutting mechanism comprises a sliding base (21) slidably connected to the upper surface of the machine bed (11), and three sliding bases (21) are provided, wherein two sliding bases (21) are symmetrically provided on one side of the machine bed (11), and another sliding base (21) is provided on the other side of the sliding base (21), and the upper surface of the sliding base (21) is fixedly connected with a support frame (22), and the top ends of the two support frames (22) close to the clamping chuck (13) are rotatably connected with a friction roller ( 23), one end of one friction roller (23) is fixedly connected to a bevel gear 1 (24), the outer surface of the top of the bevel gear 1 (24) is meshedly connected to a bevel gear 2 (25), the upper surface of the bevel gear 2 (25) is fixedly connected to a transmission wheel 1 (26), the interior of the support frame (22) is slidably connected to a cutting head (29), the outer surface of the bottom end of the cutting head (29) is rotatably connected to a long connecting rod (28), and the end of the long connecting rod (28) away from the cutting head (29) is rotatably connected to a short connecting rod (27).

2. A high-precision screw thread processing device according to claim 1, characterized in that: Bevel gear 1 (24) and bevel gear 2 (25) are both rotatably connected to the inside of the support frame (22); a short connecting rod (27), a long connecting rod (28) and a cutting head (29) are both symmetrically arranged in two groups along the central axis of the machine tool bed (11); a buffer spring is fixedly connected between the cutting head (29) and the support frame (22).

3. A high-precision screw thread processing device according to claim 2, characterized in that: It also includes a rotation direction changing mechanism arranged on the support frame (22); The rotation direction changing mechanism comprises a rotating shaft (31) rotatably connected to a support frame (22) on a side away from the clamping chuck (13); a driven gear (32) is fixedly connected to the top of the rotating shaft (31); a meshing gear (33) is meshedly connected to the top surface of the driven gear (32); a rotating gear (34) is meshedly connected to the top surface of the meshing gear (33); a second transmission wheel (35) is fixedly connected to the upper surface of the rotating gear (34); and a rotating disk (36) is attached to the upper surface of the second transmission wheel (35).

4. A high-precision screw thread processing device according to claim 3, characterized in that: A round rod is fixedly connected to the center of the top of the driven gear (32), and a hollow sleeve is fixedly connected to the center of the bottom surface of the rotating gear (34). The round rod on the driven gear (32) slides and passes through the hollow sleeve, the rotating gear (34) and the second transmission wheel (35) and extends to the top of the second transmission wheel (35). The round rod on the driven gear (32) passes through the second transmission wheel (35) and is fixedly connected to the bottom surface of the turntable (36). The meshing gear (33) is rotatably connected to the outer wall of the support frame (22).

5. The high-precision screw thread processing device according to claim 3, characterized in that: It also includes a connecting mechanism arranged on the upper surface of the machine tool bed (11); The connecting mechanism comprises an electric control telescopic rod (41) fixedly connected between two support frames (22) on the same side, a positioning base (42) is fixedly connected to the upper surface of one side of the machine tool bed (11), a slider (43) is slidably connected to the interior of the positioning base (42) through a spring telescopic rod, the upper surface of the slider (43) is rotatably connected to a support shaft (44), the outer surface of the support shaft (44) is symmetrically rotatably connected to a positioning link (45), the top end of the support shaft (44) is fixedly connected to a transmission wheel three (46), and the outer surfaces of the transmission wheel one (26), the transmission wheel two (35) and the transmission wheel three (46) are commonly connected to a transmission belt (47).

6. A high-precision screw thread processing device according to claim 5, characterized in that: The positioning base (42) is arranged between two symmetrically arranged sliding bases (21) on the same side. A sliding groove is provided on the upper surface of the positioning base (42). The end of the positioning connecting rod (45) away from the support shaft (44) is rotatably connected to the outer surface of the support frame (22).

7. The high-precision screw thread processing device according to claim 5, characterized in that: One group of short connecting rods (27) is rotatably connected to the upper surface of the transmission wheel (26) away from one end of the long connecting rod (28), and another group of short connecting rods (27) is rotatably connected to the upper surface of the rotating disk (36) away from one end of the long connecting rod (28).

8. The high-precision screw thread processing device according to claim 1, characterized in that: It also includes an adjustment mechanism arranged on the machine tool bed (11); The adjustment mechanism comprises a limiting slide rod (51) fixedly connected between two sliding bases (21) on one side close to the clamping chuck (13); a bidirectional threaded rod (52) is rotatably connected between the two sliding bases (21) on the one side close to the clamping chuck (13); and a stepping motor (53) is fixedly connected to the upper surface of one of the sliding bases (21).

9. The high-precision screw thread processing device according to claim 8, characterized in that: One end of the bidirectional threaded rod (52) passes through and extends to the outside of the sliding base (21), and the output shaft end of the stepping motor (53) is fixedly connected to one end of the bidirectional threaded rod (52) passing through the sliding base (21). The outer surfaces of both ends of the bidirectional threaded rod (52) are symmetrically provided with threads, and the thread directions are opposite. The two support frames (22) on the side close to the clamping chuck (13) are respectively symmetrically threadedly connected to the two ends of the bidirectional threaded rod (52). The two support frames (22) on the side close to the clamping chuck (13) are both slidably connected to the outer surface of the limiting slide rod (51).

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