Pump valve body ultra-deep race hole processing tool and process

Abstract

The application relates to the technical field of ring hole machining tools, in particular to a pump valve body super-deep seat ring hole machining tool and process, which comprises a machine tool boring shaft, a fine adjustment lengthened tool handle, a fine adjustment handle head and a center drill bit, the fine adjustment lengthened tool handle is fixedly arranged at the side end of the machine tool boring shaft, the fine adjustment handle head is rotationally connected to the side end of the fine adjustment lengthened tool handle, the center drill bit is fixedly arranged at the side end of the fine adjustment handle head, a fine adjustment mechanism, the fine adjustment mechanism comprises a damping adjustment assembly, a drill bit mounting assembly, a plurality of self-adaptive adjustment assemblies and a convenient driving assembly. The damping adjustment assembly can steplessly adjust the eccentric angle of the fine adjustment handle head, actively inhibits tool vibration in the super-deep hole long overhanging cutting working condition, the self-adaptive adjustment assembly can realize uniform clamping and locking of multiple points in the circumferential direction, the overall stress is balanced, and the fine adjustment handle is prevented from slightly deflecting caused by single-point pressing.

Description

Technical Field

[0001] This invention relates to the field of machining tools for ring holes, and specifically to a machining tool and process for ultra-deep seat ring holes in pump valve bodies. Background Technology

[0002] The seat ring bore inside the pump valve body is a precision sealing hole. The accuracy of the bore diameter, roundness, and coaxiality directly determine the sealing performance and pressure stability of the valve body. For valve bodies such as deep well pumps and high-pressure shut-off valves, the seat ring bore has a large depth, small diameter, and high requirements for bore wall smoothness. It is a typical case of machining ultra-deep and slender bores. Such products need to be machined on large floor-type CNC boring and milling machines. However, due to the excessively long overall overhang of the tool, the machine tool itself will also generate a lot of runout during the tool assembly process, resulting in insufficient rigidity of the machining system. This not only greatly increases the difficulty of cutting and machining, but also makes it difficult to stably guarantee the accuracy requirements of the bore position of the product.

[0003] Existing integrated extended boring tools have a fixed shank length and lack a separate eccentric adjustment structure. During ultra-deep boring, the tool overhang is large, and the cutting vibration amplitude is large, which easily leads to problems such as hole wall ripples, hole diameter deviation, and out-of-tolerance hole position coaxiality. Secondly, the extended tool shank and drill bit clamping end mostly use a single bolt locking method, which results in uneven locking force. Over long-term deep hole cutting, the tool head is prone to offsetting and loosening. At the same time, conventional boring tools cannot achieve radial micro-adjustment of the tool head or adaptive adjustment of eccentric vibration reduction, and cannot specifically counteract the elastic deformation of deep hole cutting tools, resulting in poor machining adaptability. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a tool and process for machining ultra-deep seat ring holes in pump valve bodies, which can effectively solve the problems of existing technologies such as lack of eccentric damping function, inability to synchronously adjust multi-point clamping, uneven locking force, severe vibration during deep hole cutting, and poor machining accuracy stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a tool for machining ultra-deep seat ring holes in pump valve bodies, including a machine tool boring spindle, a fine-adjustment extended tool holder, a fine-adjustment shank head, and a center drill bit. The fine-adjustment extended tool holder is fixedly mounted on the side end of the machine tool boring spindle, the fine-adjustment shank head is rotatably connected to the side end of the fine-adjustment extended tool holder, and the center drill bit is fixedly mounted on the side end of the fine-adjustment shank head.

[0007] The fine-tuning mechanism includes a vibration damping adjustment component, a drill bit mounting component, multiple adaptive adjustment components, and a convenient drive component. The convenient drive component is externally mounted on the outer wall of the fine-tuning extended tool holder and is self-locking and limiter. It is used to synchronously drive multiple sets of adaptive adjustment components to complete equal radial displacement. The adaptive adjustment component is used to convert the circumferential driving force into a radial thrust force, thereby completing the installation and fixation between the fine-tuning extended tool holder and the fine-tuning shank. The vibration damping adjustment component is located inside the fine-tuning extended tool holder and is used to adjust the eccentric angle between the fine-tuning extended tool holder and the fine-tuning shank in conjunction with the adjustment. The drill bit mounting component is coaxially located at the center of the side end of the fine-tuning shank and is used to clamp and fix the center drill bit and coordinate with the center drill bit to complete the minor correction of radial position and hole diameter coaxiality.

[0008] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the vibration damping adjustment assembly includes an eccentric cylindrical groove formed on the side end of a fine-tuning extended tool holder. A mounting cavity is formed inside the fine-tuning extended tool holder. A first motor is fixedly mounted on the inner wall of the mounting cavity via a bracket. A connecting plate is fixedly connected to the output end of the first motor. A cross groove is formed on the side wall of the connecting plate. A cross connector is slidably connected in the cross groove. A cylindrical connector is slidably connected in the eccentric cylindrical groove. The side end of the cross connector and the cylindrical connector are fixedly connected. The cylindrical connector is fixedly connected to the side end of the fine-tuning shank. An annular U-shaped groove is formed on the outer peripheral side wall of the cylindrical connector.

[0009] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the drill bit mounting assembly includes an external threaded sleeve fixedly mounted on the side end of the fine-tuning shank, a threaded sleeve threadedly connected to the external threaded sleeve, the side end of the central drill bit being slidably connected inside the external threaded sleeve, and the threaded sleeve being sleeved outside the central drill bit.

[0010] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the adaptive adjustment component includes a threaded hole formed on the inner wall of an eccentric groove, a hollow threaded rod threadedly connected to the threaded hole, a rotating rod slidably connected to the hollow threaded rod, the rotating rod being rotatably connected to the side wall of a fine-tuning extended tool holder through a bearing, two limiting grooves formed on the inner wall of the hollow threaded rod, limiting strips slidably connected to each of the two limiting grooves, and both limiting strips being fixedly connected to the side wall of the rotating rod, a first gear fixedly connected to the top of the rotating rod, and a frustum locking block fixedly connected to the bottom of the hollow threaded rod.

[0011] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the convenient drive assembly includes an annular plate rotatably sleeved on a fine-adjustment extended tool holder via a bearing. A first gear ring is fixedly connected to the side wall of the annular plate, and multiple first gears mesh with the first gear ring. A second gear ring is fixedly connected circumferentially to the annular plate. A second motor is fixedly mounted on the upper end face of the fine-adjustment extended tool holder. A second gear is fixedly connected to the output end of the second motor, and the second gear meshes with the second gear ring. A PLC controller is fixedly mounted on the lower end face of the fine-adjustment extended tool holder.

[0012] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the outer peripheral sidewall of the side end of the fine-adjustment extended tool holder is provided with a fine-adjustment scale, and the outer peripheral sidewall of the fine-adjustment shank head near one end of the fine-adjustment extended tool holder is provided with a marking line.

[0013] According to the above-mentioned tool for machining ultra-deep seat ring holes in pump valve bodies, the eccentric groove is connected to the mounting cavity. The eccentric groove is a cylindrical groove and is eccentrically set to the center of the side end of the fine-adjustment extended tool holder. Multiple frustum locking blocks are engaged with the annular U-shaped groove. The first motor and the second motor are electrically connected to the PLC controller.

[0014] A machining process for a tool used to machine ultra-deep seat ring holes in pump valve bodies is described below:

[0015] S1. Tool and workpiece pre-positioning: Position the pump and valve body fixing fixture, align it with the machining datum of the ultra-deep seat ring hole, fix the fine-adjustment extended tool holder to the machine tool boring spindle, rely on the fine-adjustment dial and marking line to complete the initial zeroing of the fine-adjustment shank, put the center drill bit into the external threaded sleeve, and tighten the threaded sleeve to hold and fix the center drill bit.

[0016] S2. Eccentric vibration damping fine adjustment: The PLC controller controls the No. 1 motor to work, and the linkage column connector rotates eccentrically in the eccentric column groove. Adjusting the eccentric angle of the fine adjustment shank head can counteract the deep hole cutting vibration and correct the coaxiality deviation of the hole machining.

[0017] S3. Handle self-locking: The PLC controller starts the second motor, which drives multiple sets of adaptive adjustment components to move down synchronously via the gear transmission. The frustum locking block is locked into the annular U-shaped groove to achieve circumferential locking and positioning of the fine-tuning extended tool handle and the fine-tuning handle head, thus completing the self-locking fixation.

[0018] S4. Deep Hole Boring: The machine tool boring spindle drives the tool to rotate, completing the roughing and finishing of the seat ring hole in layers. The adaptive adjustment component is used to offset the tool deformation in real time, stabilize the cutting accuracy, and complete the machining of the ultra-deep seat ring hole of the valve body.

[0019] S5. Reset Cyclic Machining: After a single operation is completed, the tool is retracted, the center drill bit is disassembled or replaced, and the subsequent operation or the next workpiece can be processed.

[0020] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0021] 1. The present invention, through the set shock absorption adjustment component, can drive the connecting plate and the cross connector to drive the cylindrical connector to rotate eccentrically in the eccentric groove by the No. 1 motor, and steplessly adjust the eccentric angle of the shank. It can actively suppress tool chatter and eliminate hole wall ripple defects in ultra-deep hole long overhang cutting conditions, and simultaneously correct the overall coaxiality deviation of the seat ring hole, significantly improving the dimensional stability and surface forming quality of deep hole finishing.

[0022] 2. The present invention, through the adaptive adjustment component, can convert the external circumferential rotational power into the radial feed thrust of the hollow threaded rod. Multiple sets of frustum locking blocks are simultaneously locked into the annular U-shaped groove, realizing circumferential multi-point uniform tightening and locking, and the overall force is balanced. It avoids the slight deflection of the shank caused by single-point pressing. The entire cutting process is firmly locked without loosening, and the machining dimensions are highly consistent.

[0023] 3. The present invention, through the convenient drive component, can use a second motor in conjunction with a two-stage gear ring transmission. A single motor synchronously drives all adaptive adjustment components to complete equal radial displacement. The multi-point adjustment has good synchronization. Combined with PLC electrical control, it can achieve self-locking limit. There is no need for manual point-by-point fine adjustment, which greatly shortens the tool installation and adjustment time. Moreover, the overall external design occupies little processing space and is suitable for the narrow and deep hole operation environment of valve body.

[0024] 4. The present invention, through the drill bit installation component, can quickly clamp or loosen the center drill bit by relying on the cooperation of the external threaded sleeve and the threaded sleeve. The disassembly and assembly operation is simple and labor-saving, and the installation and replacement of center drill bits of different specifications can be completed quickly. The tool changing and adjustment efficiency is high. At the same time, the fine adjustment mechanism can make a slight correction to the coaxiality of the drill bit's machining hole diameter, eliminating the initial offset error caused by the drill bit clamping, and taking into account both the convenience of disassembly and assembly and the machining accuracy.

[0025] 5. This invention, through its set dial and marking visual adjustment structure, allows for intuitive reading of the eccentric damping adjustment amount. The entire process of tool eccentric damping, multi-point synchronous locking, and drill bit coaxial correction is electrically controlled and linked, with a high degree of automation, and is suitable for batch precision machining of ultra-deep seat ring holes in various pump and valve bodies. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a three-dimensional structural cross-sectional diagram of the present invention;

[0029] Figure 3 This is a three-dimensional structural cross-sectional diagram from another perspective of the present invention;

[0030] Figure 4 This is a three-dimensional structural schematic diagram from another perspective of the present invention;

[0031] Figure 5 This is a three-dimensional structural analysis diagram of the fine-tuning extended tool holder of the present invention;

[0032] Figure 6 This is an exploded view of the shock absorption adjustment component, the adaptive adjustment component, and the convenient drive component of the present invention;

[0033] Figure 7 This is an exploded view of the drill bit mounting assembly of the present invention;

[0034] Figure 8 for Figure 6 Enlarged view of point A in the middle;

[0035] Figure 9 This is a schematic diagram of the processing technology of the present invention.

[0036] Reference numerals: 1. Machine tool boring spindle; 11. Fine-tuning extended tool holder; 12. Fine-tuning shank head; 13. Center drill bit; 2. Vibration damping adjustment assembly; 21. Eccentric cylindrical groove; 22. Mounting cavity; 23. Motor No. 1; 24. Connecting plate; 25. Cross groove; 26. Cross connector; 27. Cylindrical connector; 28. Annular U-groove; 29. ​​Fine-tuning dial; 210. Marking line; 3. Drill bit mounting assembly; 31. External threaded sleeve; 32. Threaded sleeve; 4. Adaptive adjustment assembly; 41. Threaded hole; 42. Hollow threaded rod; 43. Rotating rod; 44. Limit groove; 45. Limiting strip; 46. Gear No. 1; 47. Frustum locking block; 5. Convenient drive assembly; 51. Annular plate; 52. Gear No. 1; 53. Gear No. 2; 54. Motor No. 2; 55. Gear No. 2; 56. PLC controller. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] The present invention will be further described below with reference to embodiments.

[0039] Example: Refer to Figures 1 to 9 A tool and process for machining ultra-deep seat ring holes in pump valve bodies, comprising a machine tool boring spindle 1, a fine-adjusting extended tool holder 11, a fine-adjusting shank head 12, and a center drill bit 13. The fine-adjusting extended tool holder 11 is fixedly mounted on the side end of the machine tool boring spindle 1, the fine-adjusting shank head 12 is rotatably connected to the side end of the fine-adjusting extended tool holder 11, and the center drill bit 13 is fixedly mounted on the side end of the fine-adjusting shank head 12.

[0040] The fine-tuning mechanism includes a shock-absorbing adjustment component 2, a drill bit mounting component 3, multiple adaptive adjustment components 4, and a convenient drive component 5. The convenient drive component 5 is externally mounted on the outer wall of the fine-tuning extended tool holder 11 and can be self-locking and limited. It is used to synchronously drive multiple sets of adaptive adjustment components 4 to complete equal radial displacement. The adaptive adjustment components 4 are used to convert the circumferential driving force into radial thrust force, thereby completing the installation and fixation between the fine-tuning extended tool holder 11 and the fine-tuning shank 12. The shock-absorbing adjustment component 2 is located inside the fine-tuning extended tool holder 11 and is used to adjust the eccentric angle between the fine-tuning extended tool holder 11 and the fine-tuning shank 12 in a linkage manner. The drill bit mounting component 3 is coaxially located at the center of the side end of the fine-tuning shank 12 and is used to clamp and fix the center drill bit 13 and link the center drill bit 13 to complete the radial position and hole diameter coaxiality micro-correction.

[0041] The vibration damping adjustment assembly 2 includes an eccentric groove 21 on the side of the fine-tuning extended tool holder 11. A mounting cavity 22 is provided inside the fine-tuning extended tool holder 11. A primary motor 23 is fixedly mounted on the inner wall of the mounting cavity 22 via a bracket. A connecting plate 24 is fixedly connected to the output end of the primary motor 23. A cross groove 25 is provided on the side wall of the connecting plate 24. A cross connector 26 is slidably connected within the cross groove 25. A cylindrical connector 27 is slidably connected within the eccentric groove 21. The side ends of the cross connector 26 and the cylindrical connector 27 are fixedly connected. The cylindrical connector 27 is fixedly connected to the side end of the fine-tuning handle 12. The outer peripheral side wall of the cylindrical connector 27 is provided with an annular U-shaped groove 28. The outer peripheral side wall of the side end of the fine-tuning extended handle 11 is provided with a fine-tuning dial 29. The outer peripheral side wall of the fine-tuning handle 12 near the end of the fine-tuning extended handle 11 is provided with a marking line 210. The eccentric cylindrical groove 21 is connected to the mounting cavity 22. The eccentric cylindrical groove 21 is a cylindrical groove and is eccentrically set to the center of the side end of the fine-tuning extended handle 11. Multiple frustum locking blocks 47 are engaged with the annular U-shaped groove 28.

[0042] The drill bit mounting assembly 3 includes an external threaded sleeve 31 fixedly mounted on the side end of the fine-tuning shank 12, a threaded sleeve 32 threadedly connected to the external threaded sleeve 31, the side end of the center drill bit 13 being slidably connected inside the external threaded sleeve 31, and the threaded sleeve 32 being sleeved on the outside of the center drill bit 13.

[0043] The adaptive adjustment component 4 includes a threaded hole 41 on the inner wall of the eccentric column groove 21. A hollow threaded rod 42 is threadedly connected to the threaded hole 41. A rotating rod 43 is slidably connected to the hollow threaded rod 42. The rotating rod 43 is rotatably connected to the side wall of the fine-tuning extended tool holder 11 through a bearing. Two limiting grooves 44 are opened on the inner wall of the hollow threaded rod 42. Limiting strips 45 are slidably connected to both limiting grooves 44. Both limiting strips 45 are fixedly connected to the side wall of the rotating rod 43. A first gear 46 is fixedly connected to the top of the rotating rod 43. A frustum locking block 47 is fixedly connected to the bottom of the hollow threaded rod 42.

[0044] The convenient drive assembly 5 includes an annular plate 51 rotatably sleeved on the fine-tuning extended tool holder 11 via bearings. A first gear ring 52 is fixedly connected to the side wall of the annular plate 51, and multiple first gears 46 mesh with the first gear ring 52. A second gear ring 53 is fixedly connected to the circumference of the annular plate 51. A second motor 54 is fixedly mounted on the upper end face of the fine-tuning extended tool holder 11. A second gear 55 is fixedly connected to the output end of the second motor 54, and the second gear 55 meshes with the second gear ring 53. A PLC controller 56 is fixedly mounted on the lower end face of the fine-tuning extended tool holder 11. Both the first motor 23 and the second motor 54 are electrically connected to the PLC controller 56.

[0045] The working principle of this invention is as follows: This tool relies on the boring spindle 1 of the machine tool to provide the overall rotary cutting power. All adjustment actions are uniformly controlled by the lower PLC controller 56. It is divided into three parts: drill bit clamping and positioning, eccentric damping adjustment, and multi-point synchronous self-locking. The linkage of each structure completes the high-precision machining of ultra-deep seat ring holes.

[0046] Drill bit positioning and installation: The tail of the center drill bit 13 is inserted into the external threaded sleeve 31. The threaded sleeve 32 and the external threaded sleeve 31 form a tapered thread fit structure. When the threaded sleeve 32 is rotated in the forward direction, the threaded sleeve 32 feeds along the axial direction of the external threaded sleeve 31 and compresses the sleeve flap to contract, forming a uniform clamping force on the center drill bit 13 in the inner hole, thus fixing the drill bit. When the threaded sleeve 32 is rotated in the reverse direction, the sleeve flap opens elastically, and the center drill bit 13 can be directly removed, realizing the quick disassembly and replacement of drill bits of different specifications. At the same time, the stable clamping and fixing can also ensure the coaxial accuracy of the hole diameter during drilling and boring.

[0047] After completing the above, the assembly work of aligning and inserting the fine-tuning head 12, cylindrical connector 27, and cross connector 26 needs to be completed. During assembly, the cylindrical connector 27 is inserted axially into the eccentric cylindrical groove 21, and the angle is controlled simultaneously so that the cross connector 26 is precisely aligned with the cross groove 25 on the side wall of the connecting plate 24 to complete the alignment and full insertion. After insertion, the annular U-shaped groove 28 on the outer periphery of the cylindrical connector 27 is aligned and matched with the multiple sets of hollow threaded rods 42 on the inner wall of the eccentric cylindrical groove 21, providing a structural prerequisite for the subsequent eccentric damping angle adjustment and the connection and locking of the fine-tuning extended tool holder 11 and the fine-tuning head 12.

[0048] After assembly, the PLC controller 56 sends a control signal to drive the No. 1 motor 23 to operate. The No. 1 motor 23 outputs torque to drive the connecting plate 24 to rotate synchronously. The side wall of the connecting plate 24 has a cross groove 25, which slides and engages with the cross connector 26. This allows for continuous transmission of rotational torque during eccentric rotation, avoiding transmission jamming caused by eccentric rotation. The cross connector 26 and the cylindrical connector 27 are rigidly fixed. The cylindrical connector 27 is slidably assembled inside the eccentric cylindrical groove 21. The eccentric cylindrical groove 21 and the center of the fine-tuning extended tool holder 11 have a fixed eccentric distance. Therefore, the cylindrical connector 27 is eccentric around the center of the fine-tuning extended tool holder 11. The circular motion synchronously drives the front fine-tuning shank 12 to rotate eccentrically. This eccentricity is very small, and this method is used to reduce the runout of the subsequent center drill bit 13. The operator can read the eccentricity adjustment amount through the outer fine-tuning dial 29 and the mark 210, and match the corresponding eccentricity amount according to the valve body hole depth, cutting speed, and feed rate. The eccentric structure can change the tool cutting force fulcrum, offset the elastic vibration when the long overhanging tool is cutting, reduce hole wall ripple defects, and synchronously correct the overall coaxial deviation of the seat ring hole. After the adjustment is completed, the PLC controller 56 locks the output of the first motor 23 to keep the current eccentricity angle stable.

[0049] When it is necessary to lock the fine-tuning extended tool holder 11 and the fine-tuning head 12, the PLC controller 56 starts the second motor 54. The second gear 55 at the output end of the second motor 54 meshes with the second gear ring 53 on the outer side of the annular plate 51, driving the annular plate 51 to rotate circumferentially on the outer wall of the fine-tuning extended tool holder 11. The first gear ring 52 on the inner side of the annular plate 51 meshes synchronously with the first gear 46 at the top of all rotating rods 43. Relying on the equidistant transmission characteristics of the gear ring, all rotating rods 43 obtain the same speed and rotation angle, realizing the synchronous action of multiple sets of adaptive adjustment components 4.

[0050] A limiting strip 45 is fixed to the side wall of the rotating rod 43. The limiting strip 45 slides into the limiting groove 44 on the inner wall of the hollow threaded rod 42. When the rotating rod 43 rotates, the limiting strip 45 drives the hollow threaded rod 42 to rotate synchronously in the circumferential direction. The hollow threaded rod 42 is threadedly engaged with the threaded hole 41 on the inner wall of the eccentric column groove 21. The rotational motion is converted into linear radial feed along the threaded hole 41. The frustum locking block 47 at the bottom of the hollow threaded rod 42 moves inward synchronously and is evenly inserted into the annular U-shaped groove 28 on the outer circumference of the cylindrical connector 27. The circumferential multi-point synchronous tightening and limiting restricts the circumferential rotation and radial movement of the cylindrical connector 27 and the fine-tuning handle 12, thereby achieving self-locking fixation.

[0051] When disassembly is required after processing, motor 54 rotates in reverse, and the annular plate 51 reverses to drive all hollow threaded rods 42 to move radially backward synchronously. The frustum locking block 47 disengages from the annular U-shaped groove 28, releasing the locking constraint. The fine-tuning shank 12 can be freely adjusted eccentrically again. The entire set of convenient drive components 5 is externally arranged, which does not occupy the internal cutting space of the tool. It is suitable for the machining of narrow and deep holes in the valve body. The electronic control synchronous adjustment eliminates the problems of uneven force and inconsistent stroke of manual single-point adjustment.

[0052] Meanwhile, this structure has dynamic emergency vibration reduction and adjustment measures: during normal cutting operations, if the central drill bit 13 is detected to have excessive runout or the overall cutting vibration of the tool is too large, the equipment will automatically stop and link the PLC controller 56 to perform a secondary parameter adjustment process; first, the PLC controller 56 starts the second motor 54 to rotate in the reverse direction, releasing the locking limit between the fine-tuning extended tool holder 11 and the fine-tuning head 12, and then starts the first motor 23 to link the vibration reduction and adjustment component 2 to readjust the eccentric offset, adapt to the real-time cutting conditions, and counteract the elastic vibration generated by the cutting of the long overhanging tool; after the eccentric parameter is fine-tuned, the PLC controller 56 starts the second motor 54 in the forward direction again, relocks and fixes the fine-tuning extended tool holder 11 and the fine-tuning head 12, and after locking, the equipment restarts and continues to carry out valve body drilling and boring operations, adapting to the changing cutting conditions in real time, further reducing deep hole machining vibration, and improving machining stability;

[0053] After the drill bit is fixed and the vibration damping is adjusted, the machine tool boring spindle 1 drives the entire set of tools to rotate at high speed to perform layered boring. During the cutting process, the multi-point adaptive adjustment component 4 continuously provides uniform radial clamping constraint to offset the slight tool deformation caused by the cutting force on the long overhanging tool. The pre-set vibration damping adjustment component 2 eccentric vibration damping structure continuously suppresses the high-frequency vibration of the tool. Together with the high coaxiality center drill bit 13 after being corrected by the drill bit mounting component 3, the roughing and finishing of the large length-to-diameter ratio ultra-deep seat ring hole is completed in one go, ensuring that the hole diameter, roundness and coaxiality meet the processing requirements of the precision sealing valve body.

[0054] A machining process for a tool used to machine ultra-deep seat ring holes in pump valve bodies is described below:

[0055] S1. Tool and workpiece pre-positioning: Position the pump valve body fixing fixture, align it with the machining datum of the ultra-deep seat ring hole, fix the fine-adjustment extended tool holder 11 to the machine tool boring spindle 1, and complete the initial zeroing of the fine-adjustment shank 12 by relying on the fine-adjustment dial 29 and the mark 210. Insert the center drill bit 13 into the external threaded sleeve 31, and tighten the threaded sleeve 32 to clamp and fix the center drill bit 13.

[0056] S2. Eccentric vibration damping fine adjustment: PLC controller 56 controls motor 23 to work, and the linkage column connector 27 rotates eccentrically in the eccentric column groove 21 to adjust the eccentric angle of the fine adjustment handle 12, which counteracts the deep hole cutting vibration and corrects the coaxiality deviation of the hole processing.

[0057] S3. Handle self-locking: The second motor 54 is started by the PLC controller 56, and the multiple sets of adaptive adjustment components 4 are driven to move down synchronously through the gear ring transmission. The truncated cone locking block 47 is locked into the annular U-shaped groove 28 to realize the circumferential locking and positioning of the fine-adjustment extended handle 11 and the fine-adjustment handle head 12, and complete the self-locking fixation.

[0058] S4. Deep hole boring: The machine tool boring spindle 1 drives the tool to rotate, and completes the roughing and finishing of the seat ring hole in layers. The adaptive adjustment component 4 is used to offset the tool deformation in real time, stabilize the cutting accuracy, and complete the machining of the ultra-deep seat ring hole of the valve body.

[0059] S5. Reset Cyclic Machining: After a single operation is completed, the tool is retracted, the center drill bit 13 is disassembled or replaced, and the subsequent operation or the next workpiece can be processed.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool for machining ultra-deep seat ring holes in pump valve bodies, characterized in that, include: The machine tool boring spindle (1), the fine-adjustment extended tool holder (11), the fine-adjustment shank head (12) and the center drill bit (13) are fixedly installed on the side end of the machine tool boring spindle (1), the fine-adjustment shank head (12) is rotatably connected to the side end of the fine-adjustment extended tool holder (11), and the center drill bit (13) is fixedly installed on the side end of the fine-adjustment shank head (12). The fine-tuning mechanism includes a shock-absorbing adjustment component (2), a drill bit mounting component (3), multiple adaptive adjustment components (4), and a convenient drive component (5). The convenient drive component (5) is externally mounted on the outer wall of the fine-tuning extended tool holder (11) and can be self-locking and limited. It is used to synchronously drive multiple sets of adaptive adjustment components (4) to complete equal radial displacement. The adaptive adjustment component (4) is used to convert the circumferential driving force into radial thrust force, thereby completing the installation and fixation between the fine-tuning extended tool holder (11) and the fine-tuning shank (12). The shock-absorbing adjustment component (2) is located inside the fine-tuning extended tool holder (11) and is used to adjust the eccentric angle between the fine-tuning extended tool holder (11) and the fine-tuning shank (12) in linkage. The drill bit mounting component (3) is coaxially located at the center of the side end of the fine-tuning shank (12) and is used to clamp and fix the center drill bit (13) and link the center drill bit (13) to complete the radial position and hole diameter coaxiality slight correction.

2. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 1, characterized in that, The shock-absorbing adjustment assembly (2) includes an eccentric groove (21) on the side of the fine-tuning extended handle (11). The fine-tuning extended handle (11) has an installation cavity (22). The inner wall of the installation cavity (22) is fixedly mounted with a first motor (23) by a bracket. The output end of the first motor (23) is fixedly connected to a connecting plate (24). The side wall of the connecting plate (24) has a cross groove (25). A cross connector (26) is slidably connected in the cross groove (25). A cylindrical connector (27) is slidably connected in the eccentric groove (21). The side end of the cross connector (26) is fixedly connected to the cylindrical connector (27). The cylindrical connector (27) is fixedly connected to the side end of the fine-tuning handle (12). The outer peripheral side wall of the cylindrical connector (27) has an annular U-shaped groove (28).

3. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 1, characterized in that, The drill bit mounting assembly (3) includes an external threaded sleeve (31) fixedly mounted on the side end of the fine adjustment shank (12), a threaded sleeve (32) threadedly connected to the external threaded sleeve (31), the side end of the center drill bit (13) being slidably connected inside the external threaded sleeve (31), and the threaded sleeve (32) being sleeved outside the center drill bit (13).

4. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 2, characterized in that, The adaptive adjustment component (4) includes a threaded hole (41) on the inner wall of the eccentric column groove (21). A hollow threaded rod (42) is threadedly connected to the threaded hole (41). A rotating rod (43) is slidably connected to the hollow threaded rod (42). The rotating rod (43) is rotatably connected to the side wall of the fine-tuning extended tool holder (11) through a bearing. Two limiting grooves (44) are opened on the inner wall of the hollow threaded rod (42). Limiting strips (45) are slidably connected to both limiting grooves (44). Both limiting strips (45) are fixedly connected to the side wall of the rotating rod (43). A first gear (46) is fixedly connected to the top of the rotating rod (43). A frustum locking block (47) is fixedly connected to the bottom of the hollow threaded rod (42).

5. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 4, characterized in that, The convenient drive assembly (5) includes an annular plate (51) rotatably sleeved on the fine-tuning extended tool holder (11) via a bearing. A first gear ring (52) is fixedly connected to the side wall of the annular plate (51). Multiple first gears (46) mesh with the first gear ring (52). A second gear ring (53) is fixedly connected to the circumference of the annular plate (51). A second motor (54) is fixedly mounted on the upper end face of the fine-tuning extended tool holder (11). A second gear (55) is fixedly connected to the output end of the second motor (54). The second gear (55) meshes with the second gear ring (53). A PLC controller (56) is fixedly mounted on the lower end face of the fine-tuning extended tool holder (11).

6. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 1, characterized in that, The outer peripheral wall of the side end of the fine-adjustment extended handle (11) is provided with a fine-adjustment dial (29), and the outer peripheral wall of the fine-adjustment handle head (12) near the end of the fine-adjustment extended handle (11) is provided with a mark (210).

7. The tool for machining ultra-deep seat ring holes in a pump valve body according to claim 5, characterized in that, The eccentric groove (21) is connected to the mounting cavity (22). The eccentric groove (21) is a cylindrical groove and is eccentrically set to the center of the side end of the fine-tuning extended tool holder (11). Multiple frustum locking blocks (47) are engaged with the annular U-shaped groove (28). The first motor (23) and the second motor (54) are electrically connected to the PLC controller (56).

8. A machining process using the tool for machining the ultra-deep seat ring hole of the pump valve body according to any one of claims 1-7, characterized in that, The specific process is as follows: S1. Pre-positioning of tool and workpiece: Position the pump valve body fixing fixture, align with the machining reference of the ultra-deep seat ring hole, fix the fine adjustment extended tool holder (11) to the machine tool boring spindle (1), rely on the fine adjustment dial (29) and the mark (210) to complete the initial zeroing of the fine adjustment shank (12), put the center drill bit (13) into the external threaded sleeve (31), tighten the threaded sleeve (32) to hold and fix the center drill bit (13); S2, Eccentric vibration damping fine adjustment: PLC controller (56) controls motor (23) to work, and the linkage column connector (27) rotates eccentrically in the eccentric column groove (21) to adjust the eccentric angle of the fine adjustment handle (12), offset the deep hole cutting vibration, and correct the coaxiality deviation of the hole processing. S3, Handle self-locking: The second motor (54) is started by the PLC controller (56), and through the gear ring transmission, multiple sets of adaptive adjustment components (4) are driven to move down synchronously. The truncated cone locking block (47) is locked into the annular U-shaped groove (28) to realize the circumferential locking and positioning of the fine-tuning extended handle (11) and the fine-tuning handle head (12), and complete the self-locking fixation; S4. Deep hole boring: The machine tool boring spindle (1) drives the tool to rotate, and completes the roughing and finishing of the seat ring hole in layers. Relying on the adaptive adjustment component (4), the tool deformation is offset in real time, the cutting accuracy is stabilized, and the valve body ultra-deep seat ring hole is completed. S5. Reset Cyclic Machining: After a single operation is completed, the tool is retracted, the center drill bit (13) is disassembled or replaced, and the subsequent operation or the next workpiece can be processed.

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