An eccentric deep hole part machining device and a method for eliminating eccentricity
By improving the bed structure and detection methods of deep hole machining equipment and adjusting the drill rod position in real time, the skew problem in the machining of long-sized eccentric deep hole parts was solved, and high-precision machining results were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DEZHOU GUANLU PRECISION MASCH MFG CO LTD
- Filing Date
- 2026-07-01
- Publication Date
- 2026-07-31
AI Technical Summary
Existing deep hole machining equipment cannot correct the skewness of eccentric axial holes in real time during the machining process, making it difficult to guarantee machining accuracy, especially in long-sized eccentric deep hole parts where the skewness problem is serious.
By improving the bed structure and setting up components such as transverse tracks, spindle boxes, tool holder supports, guide rings, and correction sleeves, combined with ultrasonic wall thickness detection, real-time adjustment and support of the drill rod can be achieved. By adopting a boring process and multiple sets of tool holder supports working together, and using oil-impregnated graphite packing and guide ring support, drill rod pulsation is eliminated, achieving concentricity and uniform rigidity.
Real-time correction of deviation during machining improves the machining accuracy of deep hole parts, reduces drilling deviation, reduces tool wear, and ensures machining accuracy and stability.
Smart Images
Figure CN122480362A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of machining machinery and methods for eccentric deep hole parts, and particularly to a machining equipment for eccentric deep hole parts and a method for eliminating skewness. Background Technology
[0002] The eccentric deep hole machining parts involved in this invention are widely used in fields such as papermaking rollers and oil well logging instruments.
[0003] Most of these deep-hole machined parts are over 3 meters long (the maximum length can reach 12 meters), as shown in the attached image. Figure 1 As shown, it has a cylindrical structure with several axial holes in its thick walls. These axial holes are eccentrically positioned, meaning the workpiece cannot rotate during machining. Based on usage requirements, the skewness of these eccentric axial holes on the workpiece must be ≤0.5mm, posing significant challenges to the machining equipment and processes.
[0004] Based on the actual application requirements of existing technologies, the materials used for such eccentric deep hole machining parts are usually P550, high-temperature nickel-based alloys, stainless steel, etc. These materials are relatively expensive and heavy. In addition, due to the complex internal structure of the parts, there are uneven wall thicknesses in the base material of deep hole machining parts. According to the characteristic of the drilling tool to avoid the strong and tend to the weak, the deviation direction of the hole is uncontrollable. Deviation is also a common machining defect during deep hole machining.
[0005] At the level of deep hole machining equipment itself, current deep hole machining equipment lacks adjustment design during the machining process. The cutting tools limited by the spindle box are fixed, and the accuracy can only be adjusted by measuring the workpiece end after machining. During subsequent machining, the relative position of the blank and the cutting tool can be adjusted to achieve the adjustment of machining accuracy. However, this kind of adjustment cannot achieve process control. The machining deviation of the workpiece can only be found after a single or batch of deep holes has been machined. After the cutting tool is adjusted, it is adjusted again when machining the next or the next batch of deep holes. Therefore, the current correction and adjustment method cannot fundamentally eliminate the error.
[0006] In view of the shortcomings of existing technologies, as a deep hole component R&D enterprise, it is necessary to design a dedicated eccentric deep hole component processing equipment and disclose a method to eliminate skewness. The purpose is to improve the processing accuracy, correct deviations during the processing, and promptly correct workpiece deviations, thereby improving the processing accuracy of deep hole components. Summary of the Invention
[0007] In order to achieve the above-mentioned technical objectives and eliminate technical drawbacks, this invention discloses an eccentric deep hole machining equipment and provides a method for eliminating skewness. It improves the machining accuracy of deep hole parts by modifying the structure of the machine bed itself and making improvements in many aspects such as material fixation, process detection, and structural correction.
[0008] The technical solution adopted is as follows: An eccentric deep hole machining equipment includes a tool bed and a workpiece bed, wherein the tool bed and the workpiece bed are connected. The tool bed is equipped with a transverse track, on which the spindle box, oil supply device, and several tool holder supports are movably mounted; the tool holder supports are located between the spindle box and the oil supply device; the several tool holder supports are connected by hinges, which constrain the several tool holder supports to move at equal intervals; the tool holder supports are used to support the tool holder or drill rod. The workpiece bed is equipped with a center frame and a headstock; an adjusting slide I is provided between the workpiece bed and the headstock; an adjusting slide II is provided between the workpiece bed and the center frame; a chuck is provided on the headstock, and the chuck cooperates with the center frame to horizontally support the workpiece; The oil feeder has a guide ring inside, and the drill pipe passes through the guide ring and is in contact with the guide ring by compression. The guide ring is fixed to the outer side of the correction sleeve, and an adjustment gap is set between the correction sleeve and the inner wall of the oil feeder. The correction sleeve is connected to an external lifting device, and the vertical adjustment of the correction sleeve can be realized under the drive of the external lifting device.
[0009] The external lifting device includes a sliding column connected to the correction sleeve and an adjusting nut; the sliding column is provided with threads that cooperate with the adjusting nut, and the adjusting nut is provided with a force-applying rod or force-applying point, which drives the adjusting nut to move the sliding column vertically, thereby realizing the vertical adjustment of the drill rod.
[0010] The oil dispenser has a vertical chamber for housing the sliding column and adjusting nut. A positioning cover is installed on the top of the vertical chamber to seal it. A vertical measuring head is installed on the positioning cover to measure the vertical movement of the sliding column.
[0011] The oil feeder has an end seat inside, and a guide cylinder is installed inside the end seat. The drill rod passes through the guide cylinder, and an oil-impregnated graphite packing is installed between the drill rod and the inner wall of the guide cylinder. An axial extrusion member is installed inside the guide cylinder, and an adjusting screw is installed on the axial extrusion member. The axial extrusion of the oil-impregnated graphite packing is achieved by axially rotating it.
[0012] A method for eliminating skewness during the machining of eccentric deep-hole parts, the specific steps of which are as follows: (1) Boring: One end of the tool holder is mounted on the spindle box; the inner hole of the oil feeder supports one end of the tool holder, and the boring tool is fixed on the tool holder; the spindle box drives the tool holder to rotate, and the spindle box moves axially to complete the inner hole machining of the tool holder support, ensuring that the coaxiality of the oil feeder, tool holder support and spindle box is <0.01mm; (2) Linkage: The oil feeder, tool holder support and spindle box are connected in series by hinges. The axial movement of the spindle box makes the spacing between the oil feeder, tool holder support and spindle box equal, so that the rigidity of the drill rod is uniform when it is horizontally supported, and the drilling process deviation is reduced. (3) Measurement: Using the workpiece centerline as the line of symmetry, measure the wall thickness at the same height as the centerline of the machined hole; measure the wall thickness symmetrically at the upper and lower parts of the machined hole; compare the symmetrical data of the upper and lower parts of the machined hole; compare the wall thickness value at the centerline with the set value; determine the adjustment direction. (4) Vertical correction: Touch the upper end of the slide column with the contact of the vertical measuring instrument head; drive the adjusting nut to rotate and drive the slide column and correction sleeve to move up and down; read the detection data of two wall thickness measuring instruments symmetrically set at the upper and lower parts of the machining hole, adjust the correction sleeve to the side with the larger value, thereby adjusting the drill rod to move up and down to achieve vertical correction. (5) Left and right correction: Read the measurement data of the wall thickness measuring instrument at the center line of the machining hole, use the data measured by the left and right wall thickness measuring instrument, and adjust the lateral position of the headstock on the adjustment slide I according to the actual drilling depth, so as to adjust the left and right deviation of the drill hole.
[0013] Further elimination of drill pipe pulsation: The drill pipe passes through the guide ring, which bears the rotation and axial movement of the drill pipe, ensuring that the drill pipe is concentric with the spindle; the axial clamping parts are adjusted to tighten or loosen the oil-impregnated graphite packing, and the locking force of the drill pipe is adjusted. The self-lubricating properties of the oil-impregnated graphite packing are used to prevent the drill pipe from seizing and to eliminate drill pipe pulsation.
[0014] The beneficial effects of this invention are as follows: This invention discloses an eccentric deep hole machining equipment and a matching method, which is provided with a transverse track on the tool bed, and a spindle box, an oil supply device, and several tool holder supports are moved on the transverse track; the tool holder supports are located between the spindle box and the oil supply device; hinges are provided between the several tool holder supports to constrain the several tool holder supports to move at equal intervals; the tool holder supports are used to achieve equal-interval support for the tool holder or drill rod, so that the vertical force is uniform and the bending under force can be avoided; A guide ring is installed inside the oil feeder. The drill pipe passes through the guide ring and is in squeezing contact with the guide ring. The guide ring is fixed to the outer edge of the correction sleeve. The correction sleeve is connected to an external lifting device. Under the drive of the external lifting device, the vertical lifting and adjustment of the correction sleeve can be realized, thereby realizing the vertical adjustment of the drill pipe. In this invention, the method for eliminating skew employs a matching boring process, which solves the concentricity problem between the spindle, tool holder support, and tool guide, thus reducing drilling skew. Multiple sets of tool holder supports are linked at equal intervals, resolving the problem of uneven rigidity in the drill rod support, further reducing drilling skew. An oil-impregnated graphite packing and guide ring drill rod support structure within the oil feeder solves the drill rod pulsation problem, reducing tool wear and consequently lowering drilling skew. Ultrasonic wall thickness detection solves the problem of measuring the hole skew value and direction; the detection method is simple, fast, and accurate. By adjusting the workpiece angle and drill rod angle, the problems of reducing the skew value and controlling the skew direction are solved during processing. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of an eccentric deep hole machining equipment; Figure 2 This is a top view schematic diagram of an eccentric deep hole machining equipment; Figure 3 This is a schematic diagram of the tool holder and spindle box mounting structure; Figure 4 This is a schematic diagram of the installation structure of the drill pipe and the spindle box; Figure 5 This is a schematic diagram of the measurement state in the method of eliminating skew during the machining of eccentric deep hole parts; Figure 6 This is a schematic diagram of the installation structure of the eccentric deep hole component and the oil supply device; Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure along the middle A direction; Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure along the B-axis; Figure 9 yes Figure 7 Schematic diagram of the cross-sectional structure of region C in the middle; Figure 10 yes Figure 1 Schematic diagram of the fixing structure for machining eccentric deep hole parts; Figure label: 1. Spindle box, 2. Tool bed, 3. Tool holder support, 4. Oil feeder, 5. Boring bar, 6. Boring tool, 7. Pressure screw, 8. Drill rod, 9. Hinge, 10. Workpiece, 11. Upper and lower wall thickness gauge, 12. Left and right wall thickness gauge, 13. Correction sleeve, 14. Guide ring, 15. Sliding column, 16. Adjusting nut, 17. Force rod, 18. Vertical measuring head, 19. Center rest, 20. Headstock, 21. Left and right offset gauge, 22. Workpiece bed, 23. Chuck, 24. Lead screw pair, 25. Adjusting screw, 26. Oil-impregnated graphite packing, 27. Adjusting slide I, 28. Adjusting slide II, 29. Deep hole, 30. Adjusting clearance, 31. Vertical chamber, 32. Positioning cover, 33. End seat, 34. Guide cylinder, 35. Axial extrusion part. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0017] Example 1: Eccentric Deep Hole Machining Equipment As shown in the attached figure, an eccentric deep hole machining device includes a tool bed 2 and a workpiece bed 22. The tool bed 2 and the workpiece bed 22 are connected, and the combination of the two realizes the clamping of the workpiece 10 and the machining of the workpiece 10. In this embodiment, the workpiece 10 refers to an eccentric deep hole component, and its specific structure is as follows. Figure 1 or Figure 10 As shown, when this eccentric deep hole machining equipment processes workpiece 10, it processes the deep hole 29 on its cross-section.
[0018] The tool bed 2 is provided with a transverse track, on which the spindle box 1, the oil supply device 4, and several tool holder supports 3 are movably mounted; the tool holder supports 3 are located between the spindle box 1 and the oil supply device 4; the present invention provides hinges 9 between the several tool holder supports 3, which constrain the several tool holder supports 3 to move at equal intervals; the tool holder supports 3 are used to support the tool holder or drill rod 8; in this embodiment, the tool holder is a boring bar 5, which is used to machine the inner hole and inner groove of the workpiece 10.
[0019] The workpiece bed 22 is equipped with a center frame 19 and a headstock 20. A chuck 23 is mounted on the headstock 20 to clamp the workpiece 10. The center frame 19 provides vertical rolling support for the workpiece 10. An adjusting slide II 28 is positioned between the workpiece bed 22 and the center frame 19. An adjusting slide I 27 is positioned between the workpiece bed 22 and the headstock 20. Both adjusting slides I 27 and II 28 are driven by a lead screw pair 24, respectively driving the center frame 19 and the headstock 20 to move horizontally on the workpiece bed 22. This movement achieves horizontal adjustment of the workpiece relative to the drill rod 8. The adjusting slide I 27 is also equipped with a left-right offset gauge 21, enabling digital visualization of horizontal adjustment.
[0020] The headstock 20 is equipped with a chuck 23, which cooperates with the center frame 19 to horizontally support the workpiece 10. With the cooperation of the chuck 23 and the center frame 19, the workpiece 10 can be rotated and supported. In this embodiment, the rotation of the workpiece 10 is used to adjust the machining hole position.
[0021] The oil supply device 4 has a guide ring 14 inside, and the drill rod 8 passes through the guide ring 14 and is in compression contact with the guide ring 14. The guide ring 14 is made of polytetrafluoroethylene or copper-based material, and supports the boring bar 5 or the drill rod 8. Utilizing the self-lubricating properties of these materials, it can withstand the rotation and axial movement friction of the boring bar 5 or the drill rod 8, resulting in low wear and good concentricity.
[0022] In this embodiment, a correction component and a component for eliminating drill pipe 8 pulsation are respectively provided at the left and right ends of the oil supply device 4; like Figure 7 , 8 As shown, the correction assembly includes a correction sleeve 13 and an external lifting device. Driven by the external lifting device, the vertical adjustment of the correction sleeve 13 can be achieved. Based on the above design concept, a more specific structure is given below: The inner wall of the oil dispenser 4 is provided with a correction sleeve 13, and an adjustment gap 30 is provided between the correction sleeve 13 and the inner wall of the oil dispenser 4. The external lifting device includes a sliding column 15 connected to the correction sleeve 13 and an adjusting nut 16. The bottom of the sliding column 15 is connected to the T-slot on the correction sleeve 13 through a T-shaped protrusion to achieve a concave-convex fit. The sliding column 15 is provided with a thread to cooperate with the adjusting nut 16. The oil dispenser 4 is provided with a vertical chamber 31 for setting the sliding column 15 and the adjusting nut 16. The top of the vertical chamber 31 is provided with a positioning cover 32 to seal the vertical chamber 31. The positioning cover 32 is provided with a vertical measuring head 18, which is used to measure the vertical movement of the sliding column 15.
[0023] The present invention provides a force-applying rod 17 on the adjusting nut 16 and a clearance groove on the side wall of the vertical chamber 31. The force-applying rod 17 passes through the clearance groove and is connected to the adjusting nut 16 as a whole. With this structure, the adjusting nut 16 can be driven to rotate by the force-applying rod 17, thereby realizing the vertical movement of the correction sleeve 13. Since an adjustment gap 30 is provided between the correction sleeve 13 and the inner wall of the oil supply device, the vertical adjustment of the drill rod 8 can be realized within the range of this adjustment gap 30.
[0024] like Figure 7 , 9 As shown, the oil feeder 4 has an end seat 33 on its right end, and a guide cylinder 34 is provided inside the end seat 33. The drill rod 8 passes through the guide cylinder 34. An oil-impregnated graphite packing 26 is provided between the drill rod 8 and the inner wall of the guide cylinder 34. An axial extrusion member 35 is provided inside the guide cylinder 34. An adjusting screw 25 is provided on the axial extrusion member 35. The axial extrusion member 35 is axially extruded by axially rotating. The oil-impregnated graphite packing 26 is tightened to hold the drill rod 8. At the same time, the self-lubricating properties of the oil-impregnated graphite packing 26 are used to prevent the drill rod 8 from seizing up, thereby eliminating the pulsation of the drill rod 8.
[0025] Example 2: Method for eliminating skew during machining of eccentric deep hole parts When the length-to-diameter ratio of the deep hole 29 is ≤100, the workpiece 10 does not rotate and the deviation value is usually ≤1mm / 1000mm. When the workpiece rotates, the deviation value is usually ≤0.5mm / 1000mm. When the length-to-diameter ratio is >100, the deviation value will rise sharply and the deviation direction will be uncontrollable.
[0026] When used in papermaking rollers and oil well logging instruments, the length of such workpieces 10 mostly exceeds 3 meters (the maximum length reaches 12 meters), and the deviation value of the hole is required to be ≤0.5mm; moreover, the hole of such processed parts is eccentrically set, and the workpiece 10 cannot be rotated during processing. For such parts with a length exceeding 3 meters and an eccentrically set hole, this invention discloses a method for eliminating deviation of eccentric deep hole parts, the specific steps of which are as follows: (1) Boring: such as Figure 3As shown, the right end of the boring bar 5 is installed inside the spindle box 1 and rotates with the drive of the spindle box 1; the inner hole of the oil feeder 4 supports the left end of the boring bar 5, and the boring tool 6 is installed on the boring bar 5 using the tool clamping screw 7; the spindle box 1 drives the boring bar 5 to rotate and move axially (its axial movement drive structure is consistent with the drive structure of the boring equipment in the prior art), and the axial movement of the spindle box 1 completes the machining of the inner hole of the tool holder 3. Through the matching boring process, the tool holder 3 is machined using two processes: rough boring and fine boring, ensuring that the coaxiality of the oil feeder 4, the tool holder 3, and the spindle box 1 is <0.01mm; improving the coaxiality of the slender drill rod 8 with the spindle box 1, and in the machining state, the tool can rotate stably at a linear speed of 70m / min, achieving less tool wear, stable drilling, and reduced drilling deviation; (2) Linkage: The oil supply device 4, the tool holder 3, and the spindle box 1 are connected in series by the hinge 9. The hinge 9 forms multiple identical parallelograms. When the spindle box 1 moves axially, it will cause the parallelograms to make the same changes. The hinge 9 constrains the spacing between the oil supply device 4, the tool holder 3, and the spindle box 1 to be equal and automatically adjusts it, so that the rigidity of the drill rod 8 is uniform, which helps to reduce drilling deviation and stabilize the drill rod 8, and avoid or reduce the frequency and amplitude of drill rod 8 vibration. (3) Measurement: With the center line of workpiece 10 as the symmetrical line, left and right wall thickness measuring instruments 12 are set at the same height as the center line of the machining hole and the center line of workpiece 10. The contacts of the left and right wall thickness measuring instruments 12 are made into arc shape and touch the outer circle of workpiece 10. The measured wall thickness value is compared with the set value to calculate the left and right relative deviation and direction of the drilling. Upper and lower wall thickness measuring instruments 11 are set at symmetrical positions above and below the left and right wall thickness measuring instruments 12. The contacts of the upper and lower wall thickness measuring instruments 11 are made into eccentric arc shape (matching the outer circle of workpiece 10). The upper and lower wall thickness measuring instruments 11 touch the outer circle of workpiece 10 and measure the wall thickness value to calculate the upper and lower relative deviation and direction of the drilling. The upper and lower wall thickness measuring instruments 11 and the left and right wall thickness measuring instruments 12 are all ultrasonic wall thickness measuring instruments. (4) Vertical correction: The contact of the vertical measuring head 18 is brought to the upper end of the sliding column 15; the force rod 17 drives the adjusting nut 16 to rotate, which drives the sliding column 15 and the correction sleeve 13 to move up and down; the detection data of the two upper and lower wall thickness detectors 11 symmetrically set at the upper and lower parts of the machining hole are read, and the correction sleeve 13 is adjusted to the side with the larger value, thereby adjusting the vertical movement of the drill rod 8 to achieve vertical correction, and then adjusting the vertical deviation of the deep hole 29; In this embodiment 2, when the drilling depth is 1 meter, the deep hole 29 is detected to be deviated upward by 0.2 mm. The correction sleeve on the oil supply device is used to press down the drill rod by 0.04 mm. The drilling depth is continued to 1205 mm. The hole deviation begins to move downward. When it reaches a depth of 1820 mm, it returns to the zero position. (5) Left and right deviation correction: Read the measurement data of the left and right wall thickness measuring instrument 12 at the center line of the machining hole position, compare the data measured by the left and right wall thickness measuring instrument 12 with the standard value, and adjust the lateral position of the headstock 20 on the adjustment slide I 27 proportionally according to the actual drilling depth, thereby adjusting the left and right deviation of the drill hole. In a specific embodiment, when the drilling depth is 1 meter, the deep hole 29 is detected to be deviated to the left by 0.2 mm. The headstock is moved to the left by 0.8 mm (workpiece length 4 meters). The drilling depth continues to 1310 mm, and the deviation of the deep hole 29 begins to move to the right. When it reaches a depth of 1905 mm, it returns to the zero position. Based on the above methods for eliminating skew in eccentric deep hole parts, another important factor causing tool skew is tool holder pulsation, that is, the vibration of the drill rod 8 caused by rotational resistance during the machining process. In order to eliminate the impact of this technical problem, the present invention also makes the following improvements to eliminate tool holder pulsation: the drill rod 8 passes through the guide ring 14, and the guide ring 14 bears the rotation and axial movement of the drill rod 8, ensuring that the drill rod 8 is concentric with the spindle; by adjusting the axial pressing member 35 to tighten or loosen the oil-impregnated graphite packing 26, the locking force of the drill rod 8 is adjusted, and the self-lubricating properties of the oil-impregnated graphite packing 26 are used to prevent the drill rod 8 from seizing and eliminate the pulsation of the drill rod 8.
[0027] This invention discloses an eccentric deep hole machining equipment and a method for eliminating skew in eccentric deep holes using the aforementioned equipment. By employing a matching boring process, the concentricity problem between the spindle, tool holder support, and tool guide is solved, which helps reduce drilling skew. Multiple sets of tool holder supports 3 are linked at equal intervals, solving the problem of uneven rigidity in the drill rod 8 support, which also helps reduce drilling skew. Oil-impregnated graphite packing 26 and guide ring 14 are used in the oil supply device 4 to compress and support the drill rod 8, solving the pulsation problem of the drill rod 8, reducing tool wear, and thus reducing drilling skew. The ultrasonic wall thickness detection method solves the problem of measuring the hole skew value and skew direction; the detection method is simple, fast, and accurate. By adjusting the workpiece angle and tool holder angle, the problems of skew value and skew direction can be effectively solved and controlled during machining.
Claims
1. An eccentric deep hole machining equipment, comprising a tool bed (2) and a workpiece bed (22), wherein the tool bed (2) and the workpiece bed (22) are connected; Its features are: The tool bed (2) is provided with a transverse track, on which the spindle box (1), the oil supply device (4), and several tool holder supports (3) are moved. The tool holder supports (3) are located between the spindle box (1) and the oil supply device (4). The several tool holder supports (3) are provided with hinges (9), which constrain the several tool holder supports (3) to move together at equal intervals. The tool holder supports (3) are used to support the tool holder or drill rod (8). The workpiece bed (22) is provided with a center frame (19) and a headstock (20); an adjusting slide I (27) is provided between the workpiece bed (22) and the headstock (20); an adjusting slide II (28) is provided between the workpiece bed (22) and the center frame (19); a chuck (23) is provided on the headstock (20), and the chuck (23) cooperates with the center frame (19) to horizontally support the workpiece (10); With the center line of the workpiece (10) as the line of symmetry, left and right wall thickness measuring instruments (12) are set at the same height as the center line of the machining hole and the center line of the workpiece (10); upper and lower wall thickness measuring instruments (11) are set at the symmetrical positions above and below the left and right wall thickness measuring instruments (12). The oil feeder (4) is provided with a guide ring (14) inside. The drill rod (8) passes through the guide ring (14) and is in contact with the guide ring (14). The guide ring (14) is fixed on the outer periphery of the correction sleeve (13). An adjustment gap (30) is provided between the correction sleeve (13) and the inner wall of the oil feeder (4). The correction sleeve (13) is connected to an external lifting device. Under the drive of the external lifting device, the vertical adjustment of the correction sleeve (13) is realized.
2. The eccentric deep hole machining equipment according to claim 1, characterized in that: The external lifting device includes a sliding column (15) connected to the correction sleeve (13) and an adjusting nut (16); the sliding column (15) is provided with a thread that engages with the adjusting nut (16), and the adjusting nut (16) is provided with a force-applying rod (17) or a force-applying point, which drives the adjusting nut (16) to move the sliding column (15) vertically.
3. The eccentric deep hole machining equipment according to claim 2, characterized in that: The oil dispenser (4) is provided with a vertical chamber (31) for setting the slide column (15) and the adjusting nut (16). The top of the vertical chamber (31) is provided with a positioning cover (32), and the positioning cover (32) is provided with a vertical measuring head (18).
4. The eccentric deep hole machining equipment according to claim 1, characterized in that: The oil feeder (4) is provided with an end seat (33) inside, and a guide cylinder (34) is provided inside the end seat (33). The drill rod (8) is provided through the guide cylinder (34). An oil-impregnated graphite packing (26) is provided between the drill rod (8) and the inner wall of the guide cylinder (34). An axial extrusion member (35) is provided inside the guide cylinder (34). An adjusting screw (25) is provided on the axial extrusion member (35) for axial extrusion of the oil-impregnated graphite packing (26).
5. The eccentric deep hole machining equipment as described in claim 4, characterized in that: The drill rod (8) passes through the guide ring (14), and the guide ring (14) bears the rotation and axial movement of the drill rod (8) to ensure that the drill rod (8) is concentric with the spindle; the axial pressing member (35) is adjusted to tighten or loosen the oil-impregnated graphite packing (26), and the locking force of the drill rod (8) is adjusted. The self-lubricating properties of the oil-impregnated graphite packing (26) are used to prevent the drill rod (8) from seizing and to eliminate the pulsation of the drill rod (8).
6. A method for eliminating skew during the machining of eccentric deep-hole parts, comprising using the eccentric deep-hole part machining equipment as described in claim 3, characterized in that: Includes the following steps: (1) Boring: One end of the boring bar (5) is mounted on the spindle box (1); the inner hole of the oil feeder (4) supports one end of the boring bar (5), and the boring bar (6) is fixed on the boring bar (5); the spindle box (1) drives the boring bar (5) to rotate, and the spindle box (1) moves axially to complete the inner hole machining of the tool holder (3), ensuring that the coaxiality of the oil feeder (4), the tool holder (3), and the spindle box (1) is <0.01mm; (2) Linkage: The oil feeder (4), the tool holder (3), and the spindle box (1) are connected in series by the hinge (9). The spindle box (1) moves axially so that the distance between the oil feeder (4), the tool holder (3), and the spindle box (1) is equal. (3) Measurement: Left and right wall thickness measuring instruments (12) are set at the same height as the center line of the machining hole and the center line of the workpiece (10). The wall thickness value is measured and compared with the set value to calculate the left and right relative deviation and deviation direction of the hole. Upper and lower wall thickness measuring instruments (11) are set at symmetrical positions above and below the left and right wall thickness measuring instruments (12). The upper and lower wall thickness measuring instruments (11) touch the outer circle of the workpiece (10) and measure the wall thickness value to calculate the upper and lower relative deviation and deviation direction of the hole. The upper and lower wall thickness measuring instruments (11) and the left and right wall thickness measuring instruments (12) are all ultrasonic wall thickness measuring instruments. (4) Vertical correction: Touch the contact of the vertical measuring head (18) to the slide column (15); drive the adjusting nut (16) to rotate and drive the slide column (15) and the correction sleeve (13) to move up and down; read the detection data of the two upper and lower wall thickness measuring instruments (11) symmetrically set at the upper and lower parts of the machining hole, adjust the correction sleeve (13) to the side with the larger value, thereby adjusting the drill rod (8) to move up and down to achieve vertical correction, and then adjust the vertical deviation of the deep hole (29); (5) Left and right correction: Read the measurement data of the left and right wall thickness measuring instrument (12) at the center line of the machining hole and compare it with the standard value. Adjust the lateral position of the headstock (20) on the adjustment slide I (27) to adjust the left and right deviation of the deep hole (29).