Lengthened boring bar connecting device based on zero point positioning mechanism

Abstract

The invention belongs to the technical field of turning machining of inner holes of rotary body workpieces, and discloses a lengthened boring rod connecting device based on a zero point positioning mechanism. The side face of the power spindle box body assembly serves as a connecting base face of the boring rod seat assembly, and the lengthened boring rod assembly is clamped in an inner hole of a hydraulic expansion sleeve of the boring rod seat assembly and connected with a power spindle tool connector in the power spindle box body assembly at the same time. A boring rod seat is locked to the side face of the power spindle box assembly through a zero point positioning mechanism, two hydraulic expansion sleeves are arranged in an inner hole of the boring rod seat, and the size of each hydraulic expansion sleeve corresponds to the diameter of a clamping outer circle of a boring rod. Lengthened boring bar assemblies with the same diameter and different lengths are fastened in the boring bar seat through a hydraulic expansion sleeve, and a cutter handle interface flange of each lengthened boring bar assembly is locked on the power spindle box body assembly, so that the lengthened boring bar assemblies are angularly and axially positioned. And meanwhile, a plurality of vibration reduction structures are designed in the connecting device, so that the cutting vibration of the lengthened boring rod can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of machining technology for internal holes of rotating workpieces, and relates to an extended boring bar connection device based on a zero-point positioning mechanism for milling and turning composite machine tools. Background Technology

[0002] Milling-turning composite machine tools can perform multiple milling, turning, and boring operations on a single workpiece clamping, avoiding errors caused by repeated clamping of parts between different machines. This is a highly efficient and precise machining method. Some parts have very deep internal holes, and the tools used to machine these holes are usually over one meter long and weigh over 100 kilograms. These tools cannot be directly mounted on the power tool spindle, and the workpiece often needs to be transferred to another dedicated machine for sequential machining. This not only increases the machining cycle time but also affects machining accuracy due to repeated clamping. To expand the machining range of machine tools and improve the efficiency of parts processing, existing milling and turning composite machine tools use methods such as mounting extended boring bars on the side of the power tool spindle housing to complete deep hole machining of these parts. The connection between the extended boring bar and the power tool spindle housing needs to meet the characteristics of simple and reliable structure, high clamping accuracy, and good vibration reduction performance. The patent with publication number CN216441671U mentions a connection method using a dovetail groove as a locking mechanism, but there are many connection links, which has a certain impact on the connection rigidity. It does not specify the clamping method between the boring bar and the boring bar seat, and it cannot achieve precise axial positioning of the extended boring bar and lacks vibration reduction measures.

[0003] Therefore, this invention proposes an extended boring bar connection device based on a zero-point positioning mechanism, which directly connects the boring bar seat assembly to the side of the power tool spindle housing. The extended boring bar assembly is also connected to the power spindle tool interface, realizing angular and axial positioning of the boring bar. The boring bar is clamped in the inner hole of the boring bar seat by a hydraulic expansion sleeve, which greatly improves the clamping rigidity compared with the traditional method of tightening with screws. This device also incorporates multiple vibration damping mechanisms, thus this extended boring bar connection device has good deep hole machining accuracy and vibration damping performance. Summary of the Invention

[0004] This invention provides an extended boring bar connection device based on a zero-point positioning mechanism. Six sets of zero-point positioning mechanisms lock the boring bar seat to the side of the power spindle housing. Two hydraulic expansion sleeves, their dimensions corresponding to the outer diameter of the boring bar clamping circle, are arranged in the inner hole of the boring bar seat. Boring bar assemblies of the same diameter but different lengths are secured within the boring bar seat by the hydraulic expansion sleeves. The tool holder interface flange of the boring bar assembly is locked to the power spindle, providing angular and axial positioning for the extended boring bar assembly. Simultaneously, the connection device also incorporates multiple vibration damping structures to reduce cutting vibration of the extended boring bar.

[0005] The technical solution of this invention:

[0006] An extended boring bar connection device based on a zero-point positioning mechanism includes a power spindle housing assembly 1, a boring bar seat assembly 2, and an extended boring bar assembly 3; the side of the power spindle housing assembly 1 is used as the connection base surface of the boring bar seat assembly 2, the extended boring bar assembly 3 is clamped in the inner hole of the hydraulic expansion sleeve of the boring bar seat assembly 2, and is also connected to the power spindle tool interface 7 in the power spindle housing assembly 1.

[0007] The side of the power spindle housing assembly 1 is mainly composed of the side of the power spindle housing 8 and the auxiliary positioning block 13. The side of the power spindle housing 8 and the auxiliary positioning block 13 are located on the same plane. Multiple boring bar seat connecting zero-point positioning rivets 9 are distributed on this plane for connecting the boring bar seat assembly 2. A hydraulic quick-change connector female end 10 and a cutting fluid quick-change connector female end 12 are also arranged on the side of the power spindle housing assembly 1 for providing hydraulic oil to the boring bar seat assembly 2 and cutting fluid to the extended boring bar assembly 3, respectively. A rubber damping block 11 is also installed on the side of the power spindle housing assembly 1 for vibration reduction after the boring bar seat assembly 2 is connected.

[0008] The connecting base surface of the boring bar seat assembly 2 is the side surface of the boring bar seat 17, on which multiple boring bar seat connecting zero-point positioning chucks 15 are installed. The boring bar seat connecting zero-point positioning chucks 15 correspond to the boring bar seat connecting zero-point positioning pull studs 9 on the side surface of the power spindle housing assembly 1. The connecting base surface of the boring bar seat assembly 2 also has a cutting fluid quick-change connector male end 14 and a hydraulic quick-change connector male end 16, corresponding to the cutting fluid quick-change connector female end 12 and the hydraulic quick-change connector female end 10 on the connecting base surface of the power spindle housing assembly 1, respectively. Two pneumatic quick-change connector male ends 6 are installed on opposite surfaces of the connecting base surface of the boring bar seat assembly 2, and are connected to the boring bar seat connecting zero-point positioning chucks 15 through pipes inside the boring bar seat 17. Compressed air is introduced into the pneumatic quick-change connector male ends 6 to open the boring bar. After the zero-point positioning chuck 15 is connected to the boring bar seat assembly 2, the boring bar seat assembly 2 is loaded onto the power spindle housing assembly 1 and the connecting base surfaces of the two are brought close together. Then, the compressed air is disconnected from the male end 6 of the pneumatic quick-change connector, and the zero-point positioning chuck 15 of the boring bar seat is locked with the corresponding zero-point positioning pull stud 9 of the boring bar seat assembly 2. The boring bar seat assembly 2 and the power spindle housing assembly 1 are then connected. At the same time, the male end 14 of the cutting fluid quick-change connector and the female end 12 of the cutting fluid quick-change connector, and the male end 16 of the hydraulic quick-change connector and the female end 10 of the hydraulic quick-change connector are connected to form the cutting fluid quick-change connector and the hydraulic quick-change connector, respectively. Hydraulic oil and cutting fluid are transported from the power spindle housing assembly 1 to the boring bar seat assembly 2 through the cutting fluid quick-change connector and the hydraulic quick-change connector for the locking of the extended boring bar assembly 3 and the center water outlet of the extended boring bar 27 in the next step.

[0009] The boring bar holder 17 is internally equipped with a front hydraulic expansion sleeve 21 and a rear hydraulic expansion sleeve 18, which are installed on the front and rear ends of the boring bar holder 17 respectively. The front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 form two hydraulic oil chambers with the inner hole of the boring bar holder 17 through a star-shaped sealing ring 20. The two hydraulic oil chambers are connected to the male end 16 of the hydraulic quick-connect coupling through the internal pipeline of the boring bar holder 17. The inner cooling end cover 25 is installed at the rear end of the boring bar holder 17. The inner cooling end cover 25 is equipped with a spring oscillator damping mechanism, which absorbs the vibration through the resonance of the spring oscillator damping mechanism. The cutting vibration of the extended boring bar assembly 3 is reduced; the inner coolant end cover 25 is also equipped with a center water outlet quick-change connector male end 26, which is connected to the cutting fluid quick-change connector male end 14 through the internal pipeline of the boring bar seat assembly 2; on the other side parallel to the connecting base surface of the boring bar seat assembly 2, there is a boring bar seat storage zero-point positioning pull stud 5 and a pneumatic quick-change connector male end 6. The boring bar seat storage zero-point positioning pull stud 5 provides a positioning reference for the automatic exchange of the boring bar seat assembly 2, and the pneumatic quick-change connector male end 6 is used to connect the compressed air opened by the boring bar seat connecting zero-point positioning chuck 15;

[0010] The extended boring bar assembly 3 mainly consists of an extended boring bar 27 with a built-in vibration damping unit, a boring bar mounting plate 33, and a tool holder interface flange 34. The extended boring bar 27 is fastened to the boring bar mounting plate 33 via a pressure cap 29 and a locking expansion sleeve 30. Two O-rings 32 are installed at the mating point between the boring bar mounting plate 33 and the outer diameter of the extended boring bar 27. A hydraulic oil film 31 is filled between the two O-rings 32. A sealing ring 37 is installed on the piston 36. The piston 36 moves within the oil chamber of the boring bar mounting plate 33 and seals the hydraulic oil film 31. A pressure adjusting screw 35 is threaded into the boring bar mounting plate 33 and contacts the piston 36. The hydraulic oil film 31... The pressure is adjusted by tightening the piston 36 with the pressure adjusting screw 35. The cutting vibration transmitted by the tip of the extended boring bar 27 is further attenuated by the built-in damping unit at its front end and then by two sets of O-rings 32 and high-pressure hydraulic oil film 31. The tool holder interface flange 34 is installed at the other end of the boring bar mounting plate 33. The female end 28 of the center water outlet quick-change connector is installed at the rear end of the extended boring bar 27, which mates with the male end 26 of the center water outlet quick-change connector in the internal cooling end cover 25. The boring bar mounting plate 33 is also equipped with two extended boring bar storage zero-point positioning pull studs 4, which provide a positioning reference for the automatic exchange of the extended boring bar assembly 3.

[0011] The side of the boring bar seat 17 is also equipped with a rubber damping seat 19. When the power spindle housing assembly 1 is connected to the boring bar seat assembly 2, the rubber damping seat 19 and the rubber damping block 11 are tightly fitted together to increase the shear damping of the connecting base surface and reduce the cutting vibration of the extended boring bar assembly 3.

[0012] The boring bar holder 17 is also equipped with a pressure testing connector 38 on the internal pipeline for pressure detection of the hydraulic oil chamber and air discharge.

[0013] The aforementioned spring oscillator damping mechanism mainly consists of tension springs 22, bolts 23, and spring oscillators 24. Four bolts 23 are evenly distributed around the circumference and installed on the inner end face of the inner hole of the inner cold end cover 25. One end of each of the four tension springs 22 is hung on the bolts 23, and the other end is hung on the spring oscillators 24.

[0014] When connecting the extended boring bar assembly 3, firstly, the boring bar seat assembly 2 is connected to the power spindle housing assembly 1; then, the power spindle housing assembly 1 is in the tool release state, and then it moves along the axis of the extended boring bar 27 towards the extended boring bar assembly 3, so that the rear end of the extended boring bar 27 enters the inner hole of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18, and the tool holder interface flange 34 is also engaged with the power spindle tool interface 7 on the power spindle housing assembly 1. Then, the power spindle housing assembly 1 is in the tool pull-out state, and the tool holder is connected... The flange 34 is locked onto the power spindle tool interface 7; finally, hydraulic oil is supplied to the hydraulic oil chambers of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 through the connected hydraulic quick-change connector female end 10 and hydraulic quick-change connector male end 16, causing the thin-walled inner holes of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 to deform, completing the clamping connection of the cylindrical tool holder at the rear end of the extended boring bar 27. Thus, the extended boring bar assembly 3 is connected with high precision through the front hydraulic expansion sleeve 21, the rear hydraulic expansion sleeve 18 and the power spindle tool interface 7. After the connection of the extended boring bar assembly 3 is completed, the female end 28 of the center water outlet quick-change connector at the rear end of the extended boring bar 27 is also connected to the male end 26 of the center water outlet quick-change connector at the rear end of the boring bar seat assembly 3. The cutting fluid can enter the internal cooling end cap 25 through the connected female end 12 and male end 14 of the cutting fluid quick-change connector, and then enter the internal cooling channel of the extended boring bar 27 through the male end 26 and female end 28 of the center water outlet quick-change connector, directly reaching the cutting area of ​​the tool tip.

[0015] The beneficial effects of this invention are:

[0016] 1. Achieving high-rigidity locking of extended boring bars with standard cylindrical tool holders, and adapting to extended boring bars with different length-to-diameter ratios by introducing a boring bar seat assembly, eliminating the need for custom-made extended boring bars with non-standard interfaces. Simultaneously, the hydraulic expansion sleeve inside the boring bar seat assembly provides extremely high locking rigidity for the outer diameter of the boring bar.

[0017] 2. A high-precision connection base surface based on a zero-point positioning mechanism was invented. Taking full advantage of its structural characteristics, the zero-point positioning rivet is installed on the side of the power spindle housing, maximizing the installation base surface and reliably ensuring connection rigidity and precision. The air path for opening the zero-point positioning chuck is introduced from the boring bar seat via a quick-change connector, avoiding the addition of complex piping within the power spindle housing and also providing structural feasibility for the automatic exchange of extended boring bars.

[0018] 3. Several vibration damping mechanisms suitable for extended boring bars were invented, including pre-tightening vibration damping between the two O-rings at the front end and the cylindrical surface of the boring bar, and the attenuation of vibration energy by the hydraulic oil film; two high-damping vibration damping rubber seats further attenuating vibration through internal structural damping; two ring-type hydraulic locking expansion sleeves directly absorbing the vibration of the boring bar body; and a spring oscillator vibration damping mechanism at the rear end of the boring bar seat assembly, which absorbs the cutting vibration transmitted by the boring bar through resonance. These structural inventions have fundamentally improved the cutting capability of extended boring bar assemblies. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the extended boring bar connection.

[0020] Figure 2 This is a layout diagram of the connection base surface for the power spindle box assembly.

[0021] Figure 3 This is a layout diagram of the connection base surface for the boring bar seat assembly.

[0022] Figure 4 for Figure 3 AA sectional view.

[0023] Figure 5 for Figure 4 BB cross-sectional view.

[0024] Figure 6 for Figure 4 CC section view.

[0025] In the diagram: 1. Power spindle housing assembly; 2. Boring bar holder assembly; 3. Extended boring bar assembly; 4. Extended boring bar storage zero-point positioning rivet; 5. Boring bar holder storage zero-point positioning rivet; 6. Pneumatic quick-change connector male end; 7. Power spindle tool interface; 8. Power spindle housing; 9. Boring bar holder connecting zero-point positioning rivet; 10. Hydraulic quick-change connector female end; 11. Rubber damping block; 12. Cutting fluid quick-change connector female end; 13. Auxiliary positioning block; 14. Cutting fluid quick-change connector male end; 15. Boring bar holder connecting zero-point positioning chuck; 16. Hydraulic quick-change connector 17. Boring rod seat; 18. Rear hydraulic expansion sleeve; 19. Rubber shock absorber seat; 20. Star-shaped seal ring; 21. Front hydraulic expansion sleeve; 22. Tension spring; 23. Bolt; 24. Spring vibrator; 25. Internal coolant end cap; 26. Male end of center outlet quick-change connector; 27. Extended boring rod; 28. Female end of center outlet quick-change connector; 29. ​​Pressure cap; 30. Locking expansion sleeve; 31. Hydraulic oil film; 32. O-ring; 33. Boring rod mounting plate; 34. Tool holder interface flange; 35. Pressure adjusting screw; 36. Piston; 37. Sealing ring; 38. Pressure test connector. Detailed Implementation

[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0027] An extended boring bar connection device based on a zero-point positioning mechanism includes a connection base surface based on the zero-point positioning mechanism, a clamping mechanism using a hydraulic expansion sleeve, and a tool holder interface flange locked by a power spindle; the side of the power spindle housing assembly 1 is used as the connection base surface of the boring bar seat assembly 2, the extended boring bar assembly 3 is clamped in the inner hole of the hydraulic expansion sleeve of the boring bar seat assembly 2, and is also connected to the power spindle tool interface 7 in the power spindle housing assembly 1;

[0028] The side of the power spindle housing assembly 1 is mainly composed of the side of the power spindle housing 8 and the auxiliary positioning block 13. The side of the power spindle housing 8 and the auxiliary positioning block 13 are located on the same plane. Multiple boring bar seat connecting zero-point positioning rivets 9 are distributed on this plane for connecting the boring bar seat assembly 2. The side of the power spindle housing assembly 1 is also provided with a hydraulic quick-change connector female end 10 and a cutting fluid quick-change connector female end 12, which are used to provide hydraulic oil to the boring bar seat assembly 2 and cutting fluid to the extended boring bar assembly 3, respectively. Rubber damping blocks 11 are also installed on the side of the power spindle housing assembly 1 for vibration reduction after the boring bar seat assembly 2 is connected.

[0029] The connecting base surface of the boring bar holder assembly 2 is arranged on the side of the boring bar holder 17, on which multiple boring bar holder connecting zero-point positioning chucks 15 are installed, corresponding to the boring bar holder connecting zero-point positioning pull studs 9 on the side of the power spindle housing assembly 1; the connecting base surface of the boring bar holder 17 is also provided with a cutting fluid quick-change connector male end 14 and a hydraulic quick-change connector male end 16, which are respectively connected to the cutting fluid quick-change connector female end 12 and the hydraulic quick-change connector female end 16 on the connecting base surface of the power spindle housing assembly 1. The female end 10 of the quick-change connector corresponds to the male end 6 of the two pneumatic quick-change connectors, which are installed on the opposite surfaces of the connecting base of the boring bar seat assembly 2. They are connected to the zero-point positioning chuck 15 of the boring bar seat through the pipes inside the boring bar seat 17. Compressed air is input to the male end 6 of the pneumatic quick-change connector. After opening the zero-point positioning chuck 15 of the boring bar seat, the boring bar seat assembly 2 is loaded onto the power spindle housing assembly 1 and the connecting base surfaces of the two are brought close together. Then the pneumatic quick-change connector is disconnected. Compressed air is connected to the male end 6 of the connector. The boring bar seat is locked to the zero-point positioning chuck 15 and the corresponding zero-point positioning pull stud 9. The boring bar seat assembly 2 is then connected to the power spindle housing assembly 1. Simultaneously, the male end 14 of the quick-change connector and the female end 12 of the quick-change connector, and the male end 16 of the hydraulic quick-change connector and the female end 10 of the hydraulic quick-change connector are connected to form the quick-change connector for the cutting fluid and the hydraulic quick-change connector, respectively. Hydraulic oil and cutting fluid flow from the power spindle housing. The body assembly 1 is supplied to the boring bar seat assembly 2 via the cutting fluid quick-change connector and the hydraulic quick-change connector for locking the extended boring bar assembly 3 and center water outlet of the extended boring bar 27 in the next step; the side of the boring bar seat 17 is also equipped with a rubber damping seat 19. When the power spindle housing assembly 1 is connected to the boring bar seat assembly 2, the rubber damping seat 19 and the rubber damping block 11 are tightly fitted to increase the shear damping of the connecting base surface and reduce the cutting vibration of the extended boring bar assembly 3.

[0030] The boring bar holder 17 is internally equipped with a front hydraulic expansion sleeve 21 and a rear hydraulic expansion sleeve 18, which are installed on the front and rear faces of the boring bar holder 17 respectively. The front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 form two hydraulic oil chambers with the inner hole of the boring bar holder 17 through a star-shaped sealing ring 20. The two hydraulic oil chambers are connected to the male terminal 16 of the hydraulic quick-connect coupling through the internal pipeline of the boring bar holder 17. The internal pipeline of the boring bar holder 17 is also equipped with a pressure test connector 38 for pressure detection and air discharge of the hydraulic oil chambers. The inner cooling end cover 25 is installed at the rear end of the boring bar holder 17. The inner cooling end cover 25 is equipped with a spring oscillator damping mechanism, which is mainly composed of a tension spring 22, bolts 23 and spring oscillators 24. The four bolts 23 are arranged along the circle. Four tension springs 22 are evenly distributed on the inner end face of the inner cooling end cover 25. One end of each tension spring 22 is hung on a bolt 23, and the other end is hung on a spring vibrator 24. The resonance of the spring vibrator 24 absorbs the cutting vibration of the extended boring bar assembly 3. The inner cooling end cover 25 is also equipped with a center water outlet quick-change connector male end 26, which is connected to the cutting fluid quick-change connector male end 14 through the internal pipeline of the boring bar seat assembly 2. On the other side parallel to the connecting base surface of the boring bar seat assembly 2, there is a boring bar seat storage zero-point positioning pull stud 5 and a pneumatic quick-change connector male end 6. The boring bar seat storage zero-point positioning pull stud 5 provides a positioning reference for the automatic exchange of the boring bar seat assembly 2. The pneumatic quick-change connector male end 6 is used to connect the compressed air opened by the zero-point positioning chuck 15 of the boring bar seat connection.

[0031] The extended boring bar assembly 3 mainly consists of an extended boring bar 27 with a built-in vibration damping unit, a boring bar mounting plate 33, and a tool holder interface flange 34. The extended boring bar 27 is fastened to the boring bar mounting plate 33 via a pressure cap 29 and a locking expansion sleeve 30. Two O-rings 32 are installed at the mating point between the boring bar mounting plate 33 and the outer diameter of the extended boring bar 27. A hydraulic oil film 31 is filled between the two O-rings 32. A sealing ring 37 is installed on the piston 36. The piston 36 moves within the oil chamber of the boring bar mounting plate 33 and seals the hydraulic oil film 31. A pressure adjusting screw 35 is threaded into the boring bar mounting plate 33 and contacts the piston 36. The pressure of the hydraulic oil film 31... The force is adjusted by tightening the piston 36 with the pressure adjusting screw 35. The cutting vibration transmitted by the tip of the extended boring bar 27 is further attenuated by the built-in damping unit at its front end and then by two sets of O-rings 32 and high-pressure hydraulic oil film 31. The tool holder interface flange 34 is installed at the other end of the boring bar mounting plate 33. The female end 28 of the center water outlet quick-change connector is installed at the rear end of the extended boring bar 27, which mates with the male end 26 of the center water outlet quick-change connector in the internal cooling end cover 25. The boring bar mounting plate 33 is also equipped with two extended boring bar storage zero-point positioning pull studs 4, which provide a positioning reference for the automatic exchange of the extended boring bar assembly 3.

[0032] When connecting the extended boring bar assembly 3, firstly, the boring bar seat assembly 2 is connected to the power spindle housing assembly 1; then, the power spindle housing assembly 1 is in the tool release state, and then it moves along the axis of the extended boring bar 27 towards the extended boring bar assembly 3, so that the rear end of the extended boring bar 27 enters the inner hole of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18, and the tool holder interface flange 34 is also engaged with the power spindle tool interface 7 on the power spindle housing assembly 1. Then, the power spindle housing assembly 1 is in the tool pull-out state, and the tool holder is connected... The flange 34 is locked onto the power spindle tool interface 7; finally, hydraulic oil is supplied to the hydraulic oil chambers of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 through the connected hydraulic quick-change connector female end 10 and hydraulic quick-change connector male end 16, causing the thin-walled inner holes of the front hydraulic expansion sleeve 21 and the rear hydraulic expansion sleeve 18 to deform, completing the clamping connection of the cylindrical tool holder at the rear end of the extended boring bar 27. Thus, the extended boring bar assembly 3 is connected with high precision through the front hydraulic expansion sleeve 21, the rear hydraulic expansion sleeve 18 and the power spindle tool interface 7. After the connection of the extended boring bar assembly 3 is completed, the female end 28 of the center water outlet quick-change connector at the rear end of the extended boring bar 27 is also connected to the male end 26 of the center water outlet quick-change connector at the rear end of the boring bar seat assembly 2. The cutting fluid can enter the internal cooling end cap 25 through the connected female end 12 and male end 14 of the cutting fluid quick-change connector, and then enter the internal cooling channel of the extended boring bar 27 through the male end 26 and female end 28 of the center water outlet quick-change connector, directly reaching the cutting area of ​​the tool tip.

Claims

1. An extended boring bar connecting device based on a zero-point positioning mechanism, characterized in that, The extended boring bar connecting device includes a power spindle housing assembly (1), a boring bar seat assembly (2), and an extended boring bar assembly (3); the side of the power spindle housing assembly (1) serves as the connecting base surface of the boring bar seat assembly (2), and the extended boring bar assembly (3) is clamped in the inner hole of the hydraulic expansion sleeve of the boring bar seat assembly (2), while also being connected to the power spindle tool interface (7) in the power spindle housing assembly (1); wherein The side of the power spindle housing assembly (1) is mainly composed of the side of the power spindle housing (8) and the auxiliary positioning block (13). The side of the power spindle housing (8) and the auxiliary positioning block (13) are located on the same plane. Multiple boring bar seat connecting zero-point positioning rivets (9) are distributed on this plane for connecting the boring bar seat assembly (2). A hydraulic quick-change connector female end (10) and a cutting fluid quick-change connector female end (12) are also arranged on the side of the power spindle housing assembly (1) for providing hydraulic oil to the boring bar seat assembly (2) and cutting fluid to the extended boring bar assembly (3), respectively. A rubber damping block (11) is also installed on the side of the power spindle housing assembly (1) for vibration reduction after the boring bar seat assembly (2) is connected.

2. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 1, characterized in that, The connecting base surface of the boring bar seat assembly (2) is the side surface of the boring bar seat (17), on which multiple boring bar seat connecting zero-point positioning chucks (15) are installed. The boring bar seat connecting zero-point positioning chucks (15) correspond to the boring bar seat connecting zero-point positioning pull studs (9) on the side surface of the power spindle housing assembly (1). The connecting base surface of the boring bar seat assembly (2) is also provided with the male end (14) of the cutting fluid quick-change connector and the male end (1) of the hydraulic quick-change connector. 6), corresponding to the female end (12) of the cutting fluid quick-change connector and the female end (10) of the hydraulic quick-change connector on the connecting base surface of the power spindle housing assembly (1), respectively; the two male ends (6) of the pneumatic quick-change connector are installed on the opposite surfaces of the connecting base surface of the boring bar seat assembly (2), and are connected to the zero-point positioning chuck (15) of the boring bar seat through the pipeline inside the boring bar seat (17), so that compressed air is introduced into the male end (6) of the pneumatic quick-change connector to open the boring bar. After the rod holder is connected to the zero-point positioning chuck (15), the boring bar holder assembly (2) is loaded onto the power spindle housing assembly (1) and the connection base surfaces of the two are brought close together; then the compressed air is disconnected by the male end (6) of the pneumatic quick-change connector, the zero-point positioning chuck (15) of the boring bar holder is locked with the corresponding zero-point positioning pull stud (9) of the boring bar holder, and the boring bar holder assembly (2) is connected to the power spindle housing assembly (1); at the same time, the male end (14) of the cutting fluid quick-change connector and the female end (12) of the cutting fluid quick-change connector, and the male end (16) of the hydraulic quick-change connector and the female end (10) of the hydraulic quick-change connector are respectively connected to the cutting fluid quick-change connector and the hydraulic quick-change connector. The hydraulic oil and cutting fluid are transported from the power spindle housing assembly (1) to the boring bar holder assembly (2) through the cutting fluid quick-change connector and the hydraulic quick-change connector for the next step of locking the extended boring bar assembly (3) and the center water outlet of the extended boring bar (27); The boring bar holder (17) is internally equipped with a front hydraulic expansion sleeve (21) and a rear hydraulic expansion sleeve (18), which are installed on the front and rear faces of the boring bar holder (17) respectively. The front hydraulic expansion sleeve (21) and the rear hydraulic expansion sleeve (18) form two hydraulic oil chambers with the inner hole of the boring bar holder (17) through a star-shaped sealing ring (20). The two hydraulic oil chambers are connected to the male end (16) of the hydraulic quick-connect coupling through the pipeline inside the boring bar holder (17). The inner cooling end cover (25) is installed at the rear end of the boring bar holder (17). The inner cooling end cover (25) is provided with a spring oscillator damping mechanism, which absorbs vibration through the resonance of the spring oscillator damping mechanism. The cutting vibration of the extended boring bar assembly (3) is absorbed; the inner cooler end cover (25) is also equipped with a center water outlet quick-change connector male end (26), which is connected to the cutting fluid quick-change connector male end (14) through the internal pipeline of the boring bar seat assembly (2); on the other side parallel to the connecting base surface of the boring bar seat assembly (2), there is a boring bar seat storage zero-point positioning pull stud (5) and a pneumatic quick-change connector male end (6). The boring bar seat storage zero-point positioning pull stud (5) provides a positioning reference for the automatic exchange of the boring bar seat assembly (2), and the pneumatic quick-change connector male end (6) is used to connect the compressed air opened by the zero-point positioning chuck (15) of the boring bar seat connection.

3. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 2, characterized in that, The extended boring bar assembly (3) mainly consists of an extended boring bar (27) with a built-in vibration damping unit, a boring bar mounting plate (33), and a tool holder interface flange (34); the extended boring bar (27) is fastened to the boring bar mounting plate (33) by a pressure cap (29) and a locking expansion sleeve (30); two O-rings (32) are installed at the mating point between the boring bar mounting plate (33) and the outer circle of the extended boring bar (27), and a hydraulic oil film (31) is injected between the two O-rings (32). A sealing ring (37) is installed on the piston (36), and the piston (36) moves in the oil chamber of the boring bar mounting plate (33) and seals the hydraulic oil film (31). The pressure adjusting screw (35) is tightened in the boring bar mounting plate (33) by threads and contacts the piston (36); The pressure of the oil film (31) is adjusted by tightening the piston (36) with the pressure adjusting screw (35). The cutting vibration transmitted by the tip of the extended boring bar (27) is further attenuated by the built-in damping unit at its front end and by two sets of O-rings (32) and high-pressure hydraulic oil film (31). The tool holder interface flange (34) is installed at the other end of the boring bar mounting plate (33). The female end (28) of the center water outlet quick-change connector is installed at the rear end of the extended boring bar (27), which is matched with the male end (26) of the center water outlet quick-change connector in the internal cooling end cover (25). Two extended boring bar storage zero-point positioning pull studs (4) are also installed on the boring bar mounting plate (33). The extended boring bar storage zero-point positioning pull studs (4) provide a positioning reference for the automatic exchange of the extended boring bar assembly (3).

4. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 3, characterized in that, The side of the boring bar seat (17) is also equipped with a rubber damping seat (19). When the power spindle housing assembly (1) is connected to the boring bar seat assembly (2), the rubber damping seat (19) and the rubber damping block (11) fit together tightly, increasing the shear damping of the connecting base surface and reducing the cutting vibration of the extended boring bar assembly (3).

5. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 4, characterized in that, The boring bar seat (17) is also equipped with a pressure testing connector (38) on the pipeline inside, which is used for pressure detection of the hydraulic oil chamber and air discharge.

6. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 5, characterized in that, The spring oscillator damping mechanism is mainly composed of tension springs (22), bolts (23) and spring oscillators (24). Four bolts (23) are evenly distributed around the circumference and installed on the inner end face of the inner cold end cover (25). One end of the four tension springs (22) is hung on the bolts (23) and the other end is hung on the spring oscillators (24).

7. The extended boring bar connecting device based on the zero-point positioning mechanism according to claim 6, characterized in that, When connecting the extended boring bar assembly (3), firstly, the boring bar seat assembly (2) is connected to the power spindle housing assembly (1); then, the power spindle housing assembly (1) is in the tool release state, and then moves along the axis of the extended boring bar (27) to the extended boring bar assembly (3), so that the rear end of the extended boring bar (27) enters the inner hole of the front hydraulic expansion sleeve (21) and the rear hydraulic expansion sleeve (18), and the tool holder interface flange (34) is also combined with the power spindle tool interface (7) on the power spindle housing assembly (1). Then, the power spindle housing assembly (1) is in the tool pull state, and the tool holder interface flange (34) is locked on the power spindle tool interface (7); finally, hydraulic oil is supplied to the hydraulic oil chambers of the front hydraulic expansion sleeve (21) and the rear hydraulic expansion sleeve (18) through the connected hydraulic quick-change female end (10) and hydraulic quick-change male end (16), so that... The thin-walled inner holes of the front hydraulic expansion sleeve (21) and the rear hydraulic expansion sleeve (18) are deformed to complete the clamping connection of the cylindrical tool holder at the rear end of the extended boring bar (27). Thus, the extended boring bar assembly (3) is connected with high precision through the front hydraulic expansion sleeve (21), the rear hydraulic expansion sleeve (18) and the power spindle tool interface (7). After the connection of the extended boring bar assembly (3) is completed, the female end (28) of the center water outlet quick-change connector at the rear end of the extended boring bar (27) and the male end (26) of the center water outlet quick-change connector at the rear end of the boring bar seat assembly (2) are also connected. The cutting fluid can enter the inner cooling end cap (25) through the connected female end (12) and male end (14) of the cutting fluid quick-change connector, and then enter the inner cooling channel of the extended boring bar (27) through the male end (26) and the female end (28) of the center water outlet quick-change connector to reach the cutting area of ​​the tool tip.

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