A combined lathe-drilling machine for machining a wheel hub

Abstract

The present application relates to the technical field of compound machine tool, and discloses a turning-drilling compound machine tool for hub machining, which comprises a lathe frame, a hub body, a tool turret assembly, a drilling power head assembly and a main sliding seat.The hub body is clamped at the end of the main shaft of the lathe frame, and the main sliding seat is slidingly assembled on the lathe frame, and a sub-sliding seat and a switching cylinder for driving the sub-sliding seat to slide and switch the working position are arranged on the main sliding seat.The locking pin is retracted to be unlocked under the turning condition, the drilling power head assembly is suspended and supported by the elastic vibration isolation assembly, the vibration transmission of the cutting tool turret to the drilling power head is cut off, the additional mass-induced resonance coupling is avoided, and the vibration marks on the turning surface of the hub are eliminated.The locking pin is extended to rigidly lock the moving seat and the tool turret base under the drilling condition, and the large stiffness matrix of the tool turret is used to resist the drilling impact.

Description

Technical Field

[0001] This invention relates to the field of composite machine tool technology, and specifically to a turning and drilling composite machine tool for wheel hub machining. Background Technology

[0002] In the process of machining automobile wheel hubs, in order to reduce the positioning error caused by multiple clamping of workpieces and improve machining efficiency, turning-drilling composite machine tools are widely used. These machine tools integrate turning and drilling functions into one, and the outer circle and end face turning of the wheel hub and bolt hole drilling can be completed in one clamping of the workpiece.

[0003] Some turning-drilling composite machine tools rigidly mount the drilling power head directly on the turret or common slide, ensuring a constant rigid connection between the turret and the drilling power head. However, turning and drilling are two completely different machining processes. Turning is mainly continuous scraping cutting, resulting in relatively mild vibrations and requiring high vibration suppression of the machined parts. Drilling, on the other hand, is intermittent impact cutting, with continuous impact vibrations generated during the drill bit's feed, necessitating higher rigidity and strength of the overall structure.

[0004] When the turret and drilling head adopt the aforementioned rigid splicing structure, the two mechanisms are prone to vibration coupling. During turning operations, even if the drilling head is not actively working, its large mass alters the inherent characteristics of the turret assembly system. When the cutting excitation frequency approaches the system's natural frequency, the inherent vibration of the drilling head will be transmitted to the turret, easily causing vibration marks on the turned surface of the hub and reducing the workpiece's surface finish. During drilling operations, the structural characteristics of the turret will also react on the drilling head, weakening the drilling mechanism's impact resistance. Under harsh cutting conditions, this can easily lead to machining defects such as chipped edges at the hole opening and hole misalignment.

[0005] Currently, the industry's methods for improving vibration issues mostly involve simply increasing the wall thickness of castings and increasing the overall weight of the machine to improve structural static stiffness. While this approach can suppress vibration to some extent, it significantly increases the manufacturing cost of the machine tool and fails to fundamentally eliminate the problem of vibration interference between components under the two operating conditions. It also struggles to meet the dual requirements of precision turning and impact resistance in drilling. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this invention provides a turning-drilling composite machine tool for wheel hub processing, which can effectively solve the problem of vibration coupling between turning and drilling operations, making it difficult to simultaneously achieve vibration isolation during turning and impact resistance during drilling.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a turning and drilling composite machine tool for wheel hub processing, including a lathe frame, a wheel hub body, a turret assembly, a drilling power head assembly, and a main sliding seat; the wheel hub body is clamped at the end of the lathe frame spindle, the main sliding seat is slidably mounted on the lathe frame, the main sliding seat is provided with a secondary sliding seat and a switching cylinder for driving the secondary sliding seat to switch positions; the turret assembly is fixed to the top of the secondary sliding seat by a turret base, and the drilling power head assembly is mounted to the top of the secondary sliding seat by a feed assembly; The feeding assembly includes a feeding cylinder and a moving base; the drilling power head assembly is supported on the moving base by an elastic vibration isolation assembly containing damping elastic pads; A modal matching coupling locking mechanism is provided between the turret base and the moving base; the modal matching coupling locking mechanism includes a locking pin, a pre-tightening bracket, and a locking drive unit; The locking drive unit drives the locking pin to extend, thereby achieving rigid locking between the moving seat and the turret base, and simultaneously links the pre-tightening bracket to compress the damping elastic pad; when the locking drive unit drives the locking pin to retract and unlock, the pre-tightening bracket releases the pressure on the damping elastic pad, and the drilling power head assembly is suspended and supported by the elastic vibration isolation component.

[0008] Furthermore, the turret base has a locking port on its side wall for inserting a locking pin. The locking pin is slidably connected to the inside of the movable base, and the pin end of the locking pin extends to the outside of the movable base. The locking drive unit includes an electric push rod for driving the locking pin to move towards the locking port. The turret base is equipped with a reinforcement unit, which includes four embedded blocks. The top and bottom of the locking pin are provided with embedded grooves, so that when the locking pin is inserted into the locking port, the embedded blocks are simultaneously inserted into the embedded grooves to achieve multi-directional interlocking positioning and increase the shear bearing area of ​​the locking pin.

[0009] Furthermore, the turret base has a hydraulic cavity inside, which is filled with hydraulic oil; the four embedded blocks are hollow, and the hydraulic cavity is connected to the interior of the four embedded blocks; the top and bottom surfaces of the four embedded blocks are both made of expanded metal. The locking port has a sliding connection to a top pressure part, and one end of the top pressure part extends into the hydraulic cavity, which is used to drive the top pressure part into the hydraulic cavity when the locking pin is inserted into the locking port.

[0010] Furthermore, the electric push rod is fixed to the outside of the movable base, and the telescopic end of the electric push rod extends into the interior of the movable base and is connected to the drive end of the locking pin. The locking pin has a groove inside, and a retaining block that slides along the extension and retraction direction of the locking pin is provided inside the groove. The extension and retraction end of the electric push rod is fixedly connected to the retaining block. An elastic element for elastically squeezing the retaining block is provided inside the groove. The electric push rod includes a locking mode and a locking reinforcement mode.

[0011] Furthermore, the elastic vibration isolation assembly also includes an upper bearing plate and a lower bearing plate, with a damping elastic pad assembled between the upper bearing plate and the lower bearing plate; the upper bearing plate has multiple connecting columns fixedly connected inside, the top ends of the multiple connecting columns extending outward through a through-hole opened at the top of the movable seat and fixed to the bottom of the drilling power head assembly, and damping sleeves for wrapping the connecting columns are fixed inside the multiple through-holes; the bottom ends of the multiple connecting columns are slidably connected to the guide sleeves on the lower bearing plate. The movable seat is equipped with a support unit for vertically supporting the lower support plate; the lower support plate is assembled into the inner cavity of the movable seat through a vertical sliding pair and can be displaced in the vertical direction, thereby changing the compression amount of the damping elastic pad.

[0012] Furthermore, the upper bearing pad has an integrally formed centering calibration protrusion on its upper surface; the top surface of the movable seat has a matching calibration opening; when the pre-tightening bracket is lifted upward to compress the damping elastic pad, the centering calibration protrusion is simultaneously embedded into the calibration opening, thereby achieving radial and circumferential positioning constraints on the upper bearing pad.

[0013] Furthermore, the support unit includes two wedge blocks and an adjusting screw. One wedge block is fixed to the bottom of the lower support plate, and the other wedge block is slidably connected to the bottom of the movable seat in a horizontal manner. The wedge block is threadedly connected to the adjusting screw, which is rotatably connected to the movable seat. The inclined surfaces of the two wedge blocks are in contact with each other.

[0014] Furthermore, the pre-tightening bracket is slidably connected to the inside of the movable seat via a vertical sliding pair and is arranged below the lower bearing plate. A guide block is fixed on one side of the pre-tightening bracket, and a composite guide groove is provided on one side of the guide block. The composite guide groove is composed of two interconnected sections: an inclined groove and a straight groove. The driving end of the locking pin is fixedly connected to a guide shaft, and the end of the guide shaft extends into the guide groove.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: 1. This invention utilizes a modal matching coupling locking mechanism in conjunction with an elastic vibration isolation component. During turning operations, the locking pin retracts and unlocks, allowing the drilling power head assembly to achieve suspension support via the elastic vibration isolation component. This cuts off vibration transmission from the turret to the drilling power head, preventing resonance coupling induced by added mass and eliminating surface vibration marks on the wheel hub. During drilling operations, the locking pin extends, rigidly locking the moving seat to the turret base, utilizing the high rigidity of the turret's base to resist drilling impacts. Simultaneously, main and auxiliary sliding seats and a feed assembly are provided, allowing the drilling power head to retract and avoid interference issues caused by large-sized wheel hubs during turning, balancing machining accuracy and equipment operational safety.

[0016] 2. This invention features dual working conditions: locking and locking reinforcement. After the locking pin is inserted into the locking port to complete the initial docking and locking, the electric push rod continues to drive the pressing block to squeeze the top pressure part, driving the hydraulic chamber to fill with oil and causing the inner block to expand. The expanded inner block fills the assembly gap between the locking pin and the locking port, eliminating the play in the fit of the locking pair, allowing the moving seat and the turret base to achieve a gapless fit and lock, strengthening the integral connection between the two. This avoids relative micro-displacement caused by assembly gaps under drilling impact loads, ensuring that the turret assembly and drilling power head assembly form a complete and rigid whole, suppressing vibration deformation, and improving the machining position accuracy of bolt holes.

[0017] 3. This invention utilizes the telescopic movement of a locking pin to drive a guide shaft to slide along a guide groove, which is divided into an inclined groove and a straight groove. When the guide shaft slides in the inclined groove, it can drive the pre-tightening bracket to change the compression of the damping elastic pad, thereby adjusting the equivalent stiffness of the suspension system online; when it enters the straight groove, the elastic pad reaches its maximum compression state. Combined with a sensor array to identify resonance zones, vibration isolation parameters can be dynamically adjusted without disassembling the equipment, adapting to different wheel hub specifications and cutting conditions, quickly avoiding resonance zones, and improving the machine tool's adaptability and processing stability without requiring machine downtime for disassembly and adjustment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the combination of the turret assembly and the drilling power head assembly of the present invention; Figure 3 For the present invention Figure 2 Rear view of the structure; Figure 4 This is a top view of the main sliding seat of the present invention; Figure 5 This is a schematic diagram of the structure of the turret base of the present invention; Figure 6 This is a schematic diagram of the locking pin structure of the present invention; Figure 7 This is a partial cross-sectional view of the locking pin of the present invention; Figure 8 This is a cross-sectional view of the turret base of the present invention; Figure 9 This is a schematic diagram of the structure of the movable base of the present invention; Figure 10This is a cross-sectional view of the movable base of the present invention; Figure 11 This is a schematic diagram of the structure of the elastic vibration isolation component of the present invention; Figure 12 This is an exploded view of the elastic vibration isolation component of the present invention; Figure 13 This is a schematic diagram of the transmission of the locking pin and pre-tensioning bracket of the present invention.

[0020] The labels in the diagram represent: 10. Lathe frame; 11. Wheel hub body; 12. Turret assembly; 13. Drilling power head assembly; 14. Main sliding seat; 141. Secondary sliding seat; 142. Switching cylinder; 20. Turret base; 21. Locking port; 22. Inset block; 23. Top pressure section; 30. Feed assembly; 31. Feed cylinder; 32. Moving seat; 40. Elastic vibration isolation assembly; 41. Damping elastic pad; 42. Upper bearing plate; 43. Lower bearing plate; 44. Connecting column; 45. Damping sleeve; 46. Centering alignment protrusion; 47. Wedge block; 48. Adjusting screw; 50. Modal matching coupling locking mechanism; 51. Locking pin; 52. Pre-tightening bracket; 53. Electric push rod; 54. Embedded groove; 55. Anchor block; 56. Elastic element; 57. Guide block; 58. Guide shaft. Detailed Implementation

[0021] 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.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Example 1: Please see Figures 1 to 13 This invention provides a technical solution: a turning-drilling composite machine tool for wheel hub machining. The machine's supporting base is a lathe frame 10. The wheel hub body 11 is clamped and fixed to the spindle output end of the lathe frame 10 by a special tooling fixture. The machine tool spindle drives the wheel hub body 11 to perform main rotary cutting motion. A main sliding seat 14 is slidably mounted on the guide rail pair of the lathe frame 10. The main sliding seat 14 serves as a common mounting base for the turret assembly 12 and the drilling power head assembly 13, and can perform large-stroke feed motion along the machine tool coordinate axes.

[0024] The main sliding seat 14 is equipped with a secondary sliding seat 141 and a switching cylinder 142 on its top surface. The secondary sliding seat 141 is mounted on the main sliding seat 14 in a linear sliding pair. The cylinder body of the switching cylinder 142 is fixed to the main sliding seat 14, and its telescopic end is connected to the secondary sliding seat 141. The secondary sliding seat 141 is driven to slide back and forth by the extension and retraction of the cylinder, thereby realizing the overall station switching between the turning station and the drilling station.

[0025] The turret assembly 12 is rigidly fixed to the upper surface of the auxiliary sliding seat 141 by the turret base 20; the drilling power head assembly 13 is also assembled on the top of the auxiliary sliding seat 141 by means of the feed assembly 30, and the turret assembly 12 and the drilling power head assembly 13 are arranged side by side.

[0026] The feed assembly 30 consists of a feed cylinder 31 and a moving seat 32; the drilling power head assembly 13 is supported and mounted on the moving seat 32 by an elastic vibration isolation assembly 40, the core damping element of which is a damping elastic pad 41; the moving seat 32 is slidably mounted on the top surface of the auxiliary sliding seat 141 along a horizontal straight line, and the two ends of the feed cylinder 31 are respectively connected to the moving seat 32 and the auxiliary sliding seat 141, driving the moving seat 32 to slide laterally, thereby realizing the extension and retraction of the processing end of the drilling power head assembly 13.

[0027] Operating logic: In drilling mode, the moving base 32 drives the drilling power head assembly 13 to unfold outwards, and the drill bit reaches the machining position; in turning mode, the moving base 32 drives the drilling power head assembly 13 to retract inwards to avoid interference. Since the wheel hub body 11 is a large-diameter rotating workpiece, the retraction mode can avoid spatial positional interference between the turret base 20, the drilling power head assembly 13 and the outer contour of the wheel hub, ensuring the safety of equipment movement during the machining of large-size wheel hubs.

[0028] A modal matching coupling locking mechanism 50 is provided between the turret base 20 and the moving base 32. The modal matching coupling locking mechanism 50 includes three sets of functional components: a retractable locking pin 51, a pre-tightening bracket 52, and a locking drive unit.

[0029] Drilling operation: The locking drive unit drives the locking pin 51 to extend outward to complete the locking, establishing a rigid connection between the moving seat 32 and the turret base 20; the extension of the locking pin 51 synchronously links the pre-tightening bracket 52 to compress the damping elastic pad 41 downward, causing the elastic vibration isolation component 40 to be pressed shut, and the drilling power head assembly 13... 32 movable seats The turret base 20 and the other three components form an integrated rigid base, which uses the high rigidity structure of the turret assembly 12 to resist intermittent impact loads during drilling.

[0030] Turning operation: The locking drive unit drives the locking pin 51 to retract and unlock, the preload bracket 52 releases the pressure on the damping elastic pad 41, the drilling power head assembly 13 is suspended and supported by the elastic vibration isolation component 40, the vibration transmission path between the drilling power head assembly 13 and the turret assembly 12 is cut off, the added mass is eliminated to change the mode of the turret system, and the turning vibration defects are suppressed.

[0031] See attached document Figure 5 and Figure 6 The turret base 20 has a locking port 21 on its side wall for inserting the locking pin 51 to achieve positioning and docking. The locking pin 51 is slidably assembled inside the movable base 32, and the pin end can extend out of the movable base 32 to insert into the locking port 21. The locking drive unit adopts an electric push rod 53. The output end of the electric push rod 53 drives the locking pin 51 to move back and forth toward the locking port 21 to complete the insertion locking and removal unlocking.

[0032] The turret base 20 has a reinforcement unit inside its cavity, which includes four sets of embedded blocks 22. The upper and lower surfaces of the locking pin 51 are respectively provided with embedded grooves 54. When the locking pin 51 is fully inserted into the locking port 21, the four sets of embedded blocks 22 are simultaneously embedded into the corresponding embedded grooves 54 to achieve multi-directional interlocking positioning, increase the shear bearing area of ​​the locking pin 51, improve the impact resistance of the connection pair under drilling impact conditions, and reduce the risk of deformation failure of the locking pin 51 under alternating shear force.

[0033] See attached document Figure 8 The turret base 20 has a sealed hydraulic chamber inside, which is filled with a hydraulic pressure transmission medium. All four sets of embedded blocks 22 adopt a hollow cavity structure, and the hydraulic cavity flow channel is interconnected with the hollow cavity of each set of embedded blocks 22. The upper and lower surfaces of the embedded blocks 22 are provided with expansion metal surfaces, which are pressure-induced deformation structures.

[0034] When hydraulic oil is filled into the hollow cavity of the inner block 22, the oil pressure drives the expansion metal surface to undergo radial expansion deformation. The expansion metal surface presses against the inner wall of the locking port 21 and the groove wall of the inner groove 54 respectively, filling the assembly gap and fit clearance between the locking pin 51 and the locking port 21, realizing gapless locking, avoiding slight movement of the locking pin 51 under drilling impact load, and ensuring the accuracy of hole machining.

[0035] The locking port 21 is fitted with a sliding top pressure part 23 through a dynamic sealing pair. One end of the top pressure part 23 extends into the hydraulic chamber. During the process of inserting the locking pin 51 into the locking port 21, the end face of the locking pin 51 pushes the top pressure part 23 to move into the hydraulic chamber, compressing the volume of the hydraulic chamber. The hydraulic oil is squeezed into the interior of each inner block 22. The self-pressurized injection is achieved by mechanical pushing, without the need for an external hydraulic pump station, simplifying the hydraulic system of the whole machine.

[0036] See attached document Figures 5 to 7, Figure 9 The electric push rod 53 is fixedly installed on the outside of the movable seat 32. The telescopic end of the push rod extends into the interior of the movable seat 32 and is connected to the abutment block 55. A through groove is opened inside the locking pin 51, and the abutment block 55 can slide along the axial direction of the groove. An elastic element 56 is arranged inside the groove, and the elastic element 56 continuously applies an elastic preload to the abutment block 55.

[0037] The organization has a two-tier working model: Locking condition: The electric push rod 53 extends forward, and through the abutment block 55, it drives the locking pin 51 to move forward synchronously. The locking pin 51 is inserted into the locking port 21, completing the initial mechanical locking of the moving seat 32 and the turret base 20.

[0038] Locking and reinforcement condition: The locking pin 51 has reached the bottom of the locking port 21 and cannot go any further. The electric push rod 53 continues to push forward. The pressing block 55 overcomes the elastic force of the elastic element 56 and slides relative to the locking pin 51 in the internal groove. It individually squeezes the top pressing part 23 to compress the hydraulic chamber, increases the system oil pressure, and drives the inner insert 22 to fully expand the metal surface to eliminate all mating gaps, thereby achieving high rigidity and gapless reinforcement locking.

[0039] The elastic element 56 acts as a buffer and reset mechanism. When the electric push rod 53 retracts, the elastic element 56 pushes the clamping block 55 to reset, the hydraulic chamber pressure is released, the inner insert 22 expands and the metal surface retracts, releasing the engagement, and the locking pin 51 can be smoothly pulled out from the locking port 21.

[0040] See attached document Figures 10 to 12 In addition to the damping elastic pad 41, the elastic vibration isolation component 40 is also equipped with an upper bearing pad 42 and a lower bearing pad 43; the damping elastic pad 41 is sandwiched between the upper bearing pad 42 and the lower bearing pad 43 to form a damping vibration reduction interlayer.

[0041] Multiple connecting columns 44 are vertically fixed on the upper bearing plate 42; the multiple connecting columns 44 pass upward through the opening on the top surface of the moving seat 32, and the top end is rigidly connected to the bottom of the drilling power head assembly 13; each opening is fitted with a damping sleeve 45, which wraps around the outer wall of the connecting column 44 to suppress the radial minor vibration of the connecting column 44.

[0042] The lower end of the connecting column 44 is slidably fitted inside the guide sleeve corresponding to the lower bearing plate 43, retaining the vertical freedom of movement; the moving seat 32 is provided with a support unit, which provides vertical support for the lower bearing plate 43; the lower bearing plate 43 is assembled into the inner cavity of the moving seat 32 through a vertical sliding pair, which can realize vertical displacement, thereby changing the compression of the damping elastic pad 41.

[0043] The structure achieves the following: In the turning unlocked state, the weight of the drilling power head assembly 13 is transferred to the upper bearing plate 42 via the connecting column 44 and presses on the damping elastic pad 41. The damping elastic pad 41 and the damping sleeve 45 form a composite damping vibration isolation system to isolate the vibration transmission from the turret assembly 12 to the drilling power head assembly 13 and avoid modal coupling resonance.

[0044] See attached document Figures 10 to 12 The upper surface of the upper bearing plate 42 has an integrally formed centered calibration protrusion 46; the top surface of the movable seat 32 has a matching calibration opening. When the pre-tightening bracket 52 of the modal matching coupling locking mechanism 50 moves upward to exert extreme compression on the damping elastic pad 41, the centered calibration protrusion 46 is simultaneously embedded into the calibration opening of the movable seat 32, realizing the circumferential and radial positioning constraints of the upper bearing plate 42 and the movable seat 32.

[0045] When switching to the rigid locking mode of drilling, the centering calibration and positioning of the drilling power head assembly 13 is completed, eliminating the positional offset caused by the compression deformation of the elastic element, ensuring that the accuracy of the cutting tip coordinate of the drilling power head assembly 13 will not drift due to the locking action, and ensuring the stability of the drilling position accuracy of the bolt hole.

[0046] Example 2: The difference from Example 1 is that; See attached document Figure 10 The support unit consists of two sets of wedge blocks 47 and adjusting screws 48; one wedge block 47 is fixed to the bottom surface of the lower support plate 43; the other wedge block 47 is horizontally slidably assembled at the bottom of the inner cavity of the movable seat 32, and the sliding wedge block 47 and the adjusting screw 48 form a threaded transmission pair; the adjusting screw 48 is slewingly supported and assembled on the housing of the movable seat 32.

[0047] Two sets of wedge blocks 47 have their inclined surfaces in contact with each other. Rotating the adjusting screw 48 drives the movable wedge block 47 to move horizontally. Relying on the inclined surface transmission, the horizontal displacement is converted into vertical lifting and lowering, changing the static initial height of the lower bearing pad 43 and pre-compressing the damping elastic pad 41. By changing the initial pre-compression of the damping elastic pad 41, the equivalent stiffness of the elastic vibration isolation component 40 suspension support system can be adjusted offline to adapt to drilling power head assemblies 13 of different weights and specifications, or the natural frequency of the vibration isolation system can be pre-tuned for different wheel hub turning cutting parameters to avoid the resonance range.

[0048] Example 3: The difference from Example 1 is that; See attached document Figure 5 , Figure 6 , Figure 10 and Figure 13The pre-tightening bracket 52 is assembled inside the movable seat 32 by means of a vertical sliding pair and is arranged directly below the lower bearing plate 43; the pre-tightening bracket 52 has a rigidly fixed guide block 57 on its side, and the guide block 57 has a composite guide groove; the guide groove is composed of two interconnected parts: an inclined groove and a straight groove.

[0049] The locking pin 51 drives the guide shaft 58 to be fixed, and the end of the guide shaft 58 extends into the guide groove. When the locking pin 51 moves in a telescopic displacement, it drives the guide shaft 58 to move synchronously. The guide shaft 58 slides along the trajectory inside the guide groove, which drives the guide block 57 and the pre-tightening bracket 52 to make vertical lifting and lowering movements, so as to realize the linkage adjustment of the compression amount of the damping elastic pad 41.

[0050] Motion logic: 1. Guide shaft 58 enters the straight groove section: The straight groove has no height change, the pre-tightening bracket 52 is raised to the highest position, the damping elastic pad 41 is extremely compressed, the elastic vibration isolation component 40 is completely pressed, corresponding to the rigid locking condition of drilling.

[0051] 2. The guide shaft 58 enters the inclined groove section: the height of the inclined groove changes with the horizontal position; the guide shaft 58 moves upward along the inclined groove trajectory, the height of the pre-tightening bracket 52 decreases, the compression of the damping elastic pad 41 decreases, and the equivalent stiffness of the system decreases; the guide shaft 58 moves downward along the inclined groove trajectory, the pre-tightening bracket 52 rises, the compression of the damping elastic pad 41 increases, and the equivalent stiffness of the system increases, realizing online tuning without disassembly.

[0052] The drilling power head assembly 13 is equipped with a sensor group to collect vibration signals and identify whether the system is operating in the resonance range. The machine tool control system can control the locking pin 51 to make slight extension and retraction, drive the guide shaft 58 to move in the inclined groove, modify the equivalent stiffness of the vibration isolation system online, so that the system can quickly get out of the resonance range without stopping the machine for disassembly and adjustment, and improve the stability of machine tool processing under complex working conditions.

[0053] 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 turning-drilling composite machine tool for wheel hub processing, comprising a lathe frame (10), a wheel hub body (11), a turret assembly (12), a drilling power head assembly (13), and a main sliding seat (14); the wheel hub body (11) is clamped at the end of the spindle of the lathe frame (10), and the main sliding seat (14) is slidably mounted on the lathe frame (10), characterized in that: The main sliding seat (14) is provided with a secondary sliding seat (141) and a switching cylinder (142) for driving the secondary sliding seat (141) to slide and switch positions; the turret assembly (12) is fixed to the top of the secondary sliding seat (141) through the turret base (20), and the drilling power head assembly (13) is assembled to the top of the secondary sliding seat (141) through the feed assembly (30); The feed assembly (30) includes a feed cylinder (31) and a moving seat (32); the drilling power head assembly (13) is supported on the moving seat (32) by an elastic vibration isolation assembly (40) containing a damping elastic pad (41); A modal matching coupling locking mechanism (50) is provided between the turret base (20) and the moving base (32); the modal matching coupling locking mechanism (50) includes a locking pin (51), a pre-tightening bracket (52) and a locking drive unit; The locking drive unit drives the locking pin (51) to extend so that the moving seat (32) and the turret base (20) are rigidly locked together, and the pre-tightening bracket (52) is synchronously linked to compress the damping elastic pad (41); when the locking drive unit drives the locking pin (51) to retract and unlock, the pre-tightening bracket (52) releases the pressure on the damping elastic pad (41), and the drilling power head assembly (13) is suspended and supported by the elastic vibration isolation component (40).

2. The turning and drilling combined machine tool for wheel hub processing according to claim 1, characterized in that: The turret base (20) has a locking port (21) on its side wall for inserting a locking pin (51). The locking pin (51) is slidably connected to the inside of the movable seat (32), and the pin end of the locking pin (51) extends to the outside of the movable seat (32). The locking drive unit includes an electric push rod (53) for driving the locking pin (51) to move towards the locking port (21). The turret base (20) is equipped with a reinforcement unit inside. The reinforcement unit includes four embedded blocks (22). The top and bottom of the locking pin (51) are provided with embedded grooves (54) so ​​that when the locking pin (51) is inserted into the locking port (21), the embedded blocks (22) are simultaneously inserted into the embedded grooves (54) to achieve multi-directional interlocking positioning and increase the shear bearing area of ​​the locking pin (51).

3. The turning and drilling combined machine tool for wheel hub processing according to claim 2, characterized in that: The turret base (20) has a hydraulic cavity inside, and the hydraulic cavity is filled with hydraulic oil; the four embedded blocks (22) are hollow, and the hydraulic cavity is connected to the interior of the four embedded blocks (22); the top and bottom surfaces of the four embedded blocks (22) are both made of expanded metal. The locking port (21) is slidably connected to a top pressure part (23), and one end of the top pressure part (23) extends into the hydraulic cavity, which is used to drive the top pressure part (23) into the hydraulic cavity when the locking pin (51) is inserted into the locking port (21).

4. The turning and drilling combined machine tool for wheel hub processing according to claim 3, characterized in that: The electric push rod (53) is fixed to the outside of the movable seat (32), and the telescopic end of the electric push rod (53) extends into the inside of the movable seat (32) and is connected to the drive end of the locking pin (51). The locking pin (51) has a groove inside, and a pressing block (55) that slides along the extension direction of the locking pin (51) is provided inside the groove. The extension end of the electric push rod (53) is fixedly connected to the pressing block (55). An elastic element (56) for elastically squeezing the pressing block (55) is provided inside the groove. The electric push rod (53) includes a locking mode and a locking reinforcement mode.

5. The turning and drilling combined machine tool for wheel hub processing according to claim 1, characterized in that: The elastic vibration isolation assembly (40) also includes an upper bearing plate (42) and a lower bearing plate (43), and a damping elastic pad (41) is assembled between the upper bearing plate (42) and the lower bearing plate (43); the upper bearing plate (42) is internally fixedly connected with a plurality of connecting columns (44), the top ends of the plurality of connecting columns (44) extend outward through the openings at the top of the movable seat (32) and are fixed to the bottom of the drilling power head assembly (13), and the interior of the plurality of openings is fixed with damping sleeves (45) for wrapping the connecting columns (44); the bottom ends of the plurality of connecting columns (44) are slidably connected to the guide sleeves on the lower bearing plate (43); The movable seat (32) is provided with a support unit for vertically supporting the lower support plate (43); the lower support plate (43) is assembled in the inner cavity of the movable seat (32) through a vertical sliding pair and can be displaced in the vertical direction, thereby changing the compression amount of the damping elastic pad (41).

6. The turning and drilling combined machine tool for wheel hub processing according to claim 5, characterized in that: The upper surface of the upper bearing pad (42) is integrally formed with a centering calibration protrusion (46); the top surface of the movable seat (32) is provided with a matching calibration port; when the pre-tightening bracket (52) is lifted upward to compress the damping elastic pad (41), the centering calibration protrusion (46) is simultaneously embedded in the calibration port to achieve radial and circumferential positioning constraints on the upper bearing pad (42).

7. The turning and drilling combined machine tool for wheel hub processing according to claim 5, characterized in that: The support unit includes two wedge blocks (47) and an adjusting screw (48). One wedge block (47) is fixed to the bottom of the lower support plate (43), and the other wedge block (47) is slidably connected to the bottom of the movable seat (32) in a horizontal manner. The wedge block (47) is threadedly connected to the adjusting screw (48), which is rotatably connected to the movable seat (32). The inclined surfaces of the two wedge blocks (47) are in contact with each other.

8. The turning and drilling combined machine tool for wheel hub processing according to claim 5, characterized in that: The pre-tightening bracket (52) is slidably connected to the inside of the movable seat (32) via a vertical sliding pair and is arranged below the lower bearing plate (43); a guide block (57) is fixed on one side of the pre-tightening bracket (52), and a composite guide groove is provided on one side of the guide block (57). The composite guide groove is composed of two interconnected sections: an inclined groove and a straight groove; the driving end of the locking pin (51) is fixedly connected to a guide shaft (58), and the end of the guide shaft (58) extends into the guide groove.

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