A double-rotation machining tool for eccentric deep hole machining of shaft parts

Abstract

The application provides a double-rotation machining tool for eccentric deep hole machining of shaft parts, and relates to the field of part machining. The tool comprises a tool, one end of the tool is provided with a clamping bed, the other end of the tool is provided with a drilling bed, one end of the clamping bed is provided with a hydraulic chuck, a plurality of placing seats are arranged on the clamping bed, one end of the drilling bed is provided with a hydraulic center frame, and a gun drill drill rod is arranged on the drilling bed. The tool utilizes the opposite motion of the counterclockwise rotation of the workpiece and the clockwise rotation of the drill rod to offset the one-way cutting stress and tool deflection error in the drilling process. Meanwhile, the tool relies on the synchronous control of numerical control X and Y axis interpolation to ensure that the revolution trajectory of the drill rod and the rotation trajectory of the eccentric hole are real-time synchronized, and finally the eccentric hole machining deflection accuracy is improved to 0.5 / 1000x hole depth, the accuracy is doubled, the core problems of easy deflection and poor coaxiality of eccentric deep hole machining are solved, and the part machining qualification rate is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of parts processing, and in particular to a dual rotary machining center for machining eccentric deep holes in shaft-type parts. Background Technology

[0002] Shaft-type eccentric deep-hole components are core foundational parts in fields such as petroleum machinery and high-end equipment manufacturing. The machining accuracy, straightness, and skewness of their inner holes directly determine the assembly accuracy, operational stability, and service life of the entire equipment, making them a critical process in the machining of high-precision components. In deep-hole machining technology, hole skewness is a core indicator for measuring the quality of deep-hole machining.

[0003] Currently, the technology for machining coaxial deep holes in shaft parts is relatively mature in the industry. A common approach is a dual-rotation machining method, where the workpiece rotates counter-clockwise and the tool rotates clockwise. This bi-directional rotation counteracts cutting stress, allowing the drilling deviation to be stably controlled within a high-precision range of 0.5 / 1000 × hole depth, meeting the requirements for precision coaxial deep hole machining. However, for machining eccentric deep holes in shaft parts, existing machining equipment and processes have significant technical limitations. Due to equipment structural constraints, traditional machining methods can only employ a single-rotation drilling mode where the workpiece is fixed and a single tool rotates clockwise, failing to achieve bi-directional rotation machining between the workpiece and tool.

[0004] Because the workpiece remains fixed throughout the drilling process, the unidirectional cutting stress cannot be offset, causing the tool to wobble and retract. This results in the eccentric hole machining deviation only reaching 1 / 1000 × hole depth, significantly lower than the standard for coaxial deep hole machining. This easily leads to quality problems such as hole body deviation, poor coaxiality, and large hole diameter errors, resulting in high parts scrap and rework rates. Furthermore, existing eccentric deep hole machining equipment has poor versatility, making it difficult to adapt to machining various specifications of shaft parts with different eccentricities, hole diameters, and hole depths. Tooling changes are cumbersome, and equipment modification costs are high. Traditional clamping methods rely on precise manual alignment and leveling, resulting in complex clamping processes and low positioning efficiency, making them unsuitable for batch precision production needs.

[0005] Therefore, it is necessary to provide a new dual rotary machining center for machining eccentric deep holes in shaft parts to solve the above-mentioned technical problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a dual rotary machining center for machining eccentric deep holes in shaft parts.

[0007] This invention provides a dual rotary machining center for machining eccentric deep holes in shaft-type parts, comprising: a machine tool, one end of which is equipped with a clamping bed, and the other end of which is equipped with a drilling bed. A hydraulic chuck is mounted and connected to one end of the clamping bed, which is equipped with multiple placement seats. A hydraulic center support is mounted and connected to one end of the drilling bed, and a gun drill rod is provided on the drilling bed. A dual rotary drilling system includes a main base plate, a beam frame fixedly connected to the main base plate, a mounting plate on the beam frame, a ball-driven bottom block on the lower side surface of the main base plate, two symmetrically arranged bosses on the drilling bed, a transverse shaft rotatably connected between the two bosses, a ball-driven back block at the center of the mounting plate, and a longitudinal shaft rotatably connected between the beam frame and the main base plate.

[0008] Preferably, the transverse shaft is a threaded rod, the ball drive base block is threadedly connected to the transverse shaft, the longitudinal shaft is a threaded rod, and the ball drive back block is threadedly connected to the longitudinal shaft.

[0009] Preferably, the main seat plate is symmetrically provided with two transverse rolling tracks, and each end of the main seat plate is provided with a main ball bearing block. The two main ball bearing blocks are slidably connected to the two transverse rolling tracks respectively. Each end of the beam frame is provided with a longitudinal rolling track, and each end of the mounting plate is provided with a secondary ball bearing block. The two secondary ball bearing blocks are slidably connected to the two longitudinal rolling tracks respectively.

[0010] Preferably, a main motor is installed and connected to the drilling machine, and the output end of the main motor is fixedly connected to the transverse axis. An auxiliary motor is installed and connected to the top of the beam frame, and the output end of the auxiliary motor is fixedly connected to the longitudinal axis.

[0011] Preferably, the clamping bed has an opening slot at its middle position, and a quick-release stabilizing mechanism is provided at the opening slot. The quick-release stabilizing mechanism includes two stabilizing brackets, which are symmetrically arranged in the opening slot. A back plate is provided in the opening slot, and a lifting component is provided between the back plate and the opening slot. Each of the two stabilizing brackets has multiple mounting holes, and each of the multiple mounting holes has an embedded wheel. The multiple embedded wheels are rotatably connected to the inner wall of the mounting hole through pins. A main shaft is fixedly connected to the lower end of each of the two stabilizing brackets. The two main shafts are rotatably connected to the two ends of the back plate, respectively. Gears are fixedly connected to each of the two main shafts, and racks are provided on the lower side of each of the two gears. The two racks mesh with the two gears, and the two gears are staggered.

[0012] Preferably, a base frame is fixedly connected to the lower end of the back plate, and two horizontal blocks are provided on each of the two racks. Two limiting rods are symmetrically provided on the base frame. The two horizontal blocks are slidably connected to the two limiting rods respectively. A spring is sleeved on each of the two limiting rods. Side blocks are provided on the side walls of the two horizontal blocks, and built-in wheels are installed in each of the two side blocks.

[0013] Preferably, an extension block is provided below each of the two horizontal blocks, and two through slots are symmetrically provided on the base frame. The two extension blocks are slidably connected to the two through slots respectively. Side plates are provided at both ends of the base frame, and a central shaft is rotatably connected between the two side plates. The two ends of the central shaft are provided with threads in opposite directions, and the two extension blocks are threadedly connected to the two ends of the central shaft respectively.

[0014] Preferably, one end of the central shaft extends to the outer side of the side plate, two arc-shaped pieces are symmetrically provided at one end of the central shaft, an alignment cap is provided on the central shaft, a rotating wheel is installed and connected to one end of the central shaft, a thread is provided at the end of the central shaft, the cap opening of the alignment cap is threaded to the central shaft, and the cap tail of the alignment cap is aligned with the two arc-shaped pieces.

[0015] Compared with related technologies, the dual rotary machining center for machining eccentric deep holes in shaft parts provided by this invention has the following advantages: This invention innovatively achieves a dual-reverse rotation machining mode for eccentric holes, utilizing the counter-clockwise rotation of the workpiece and the clockwise rotation of the drill rod to counteract the unidirectional cutting stress and tool runout error during drilling. Simultaneously, relying on CNC X and Y axis interpolation synchronous control, it ensures that the drill rod's revolution trajectory and the eccentric hole's rotation trajectory are synchronized in real time. Ultimately, the eccentric hole machining deviation accuracy is improved to 0.5 / 1000×hole depth, doubling the accuracy, completely solving the core problems of easy deviation and poor coaxiality in eccentric deep hole machining, and significantly improving the part machining qualification rate. This invention, through its modular and adjustable structural design, possesses strong versatility. The dual-rotation drilling system utilizes a transverse and longitudinal bidirectional lead screw guide structure, which allows for flexible adjustment of the drill rod's machining position and height. It is suitable for machining eccentric deep holes with different eccentricities and depths, solving the machining problem of high-precision shaft eccentric deep holes in high-end fields such as petroleum machinery. It can meet the stringent quality standards of high-end equipment for shaft eccentric deep holes, significantly improving the machining quality and performance of shaft components, and reducing the scrap rate and rework costs. 3. This invention uses two stabilizing brackets, allowing the workpiece to be placed directly and automatically adapt to the bracket opening angle, achieving flexible support without the need for repeated manual calibration and positioning. The gear and rack synchronous transmission structure ensures that the two sets of stabilizing brackets open and close synchronously and are subjected to uniform force. The adjustment operation is simple and efficient; the limit parameters can be adjusted simply by rotating the rotating wheel, greatly simplifying the workpiece clamping and placement process and helping to shorten the clamping and positioning time. 4. This invention uses a rotating wheel to adjust the central shaft, precisely controlling the opening angle range of the support bracket. Combined with an adaptive spring buffer structure, it can be adapted to clamp and support shaft workpieces of different diameters. Furthermore, the combination clamping method of hydraulic chuck and hydraulic center frame can be compatible with the centering and support of various specifications of shaft parts. It can complete the processing of multiple types of parts without changing tooling, effectively reducing equipment modification costs and changeover time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention; Figure 2 for Figure 1 One of the schematic diagrams of the dual rotary drilling system shown; Figure 3 for Figure 2 The second schematic diagram of the dual rotary drilling system is shown. Figure 4 for Figure 1 A schematic diagram of the rotation direction of a component in a preferred embodiment is shown; Figure 5 for Figure 1 The diagram shows the structure of the quick-release support mechanism; Figure 6 for Figure 5 The diagram shows the structure at point A. Figure 7 for Figure 5 The diagram shows the structure at point B.

[0017] Numbered in the diagram: 1. Machine tool; 11. Clamping machine; 12. Drilling machine; 2. Hydraulic chuck; 21. Placement seat; 22. Hydraulic center rest; 3. Gun drill rod; 4. Main base plate; 41. Beam frame; 42. Mounting plate; 43. Ball drive base block; 44. Boss; 45. Transverse axis; 46. Ball drive back block; 47. Longitudinal axis; 5. Transverse rolling track; 51. Ball main chuck block; 52. Longitudinal rolling track; 53. Ball bearing auxiliary block; 6. Main motor; 61. Auxiliary motor; 7. Stabilizer bracket; 71. Back plate; 72. Embedded wheel; 721. Pin shaft; 73. Main shaft; 74. Gear; 75. Rack; 8. Base frame; 81. Horizontal block; 82. Limiting rod; 83. Spring; 84. Side block; 85. Auxiliary wheel; 86. Extension block; 9. Side plate; 91. Central shaft; 92. Arc-shaped piece; 93. Alignment cap; 94. Rotary wheel. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Please see Figures 1 to 7A dual rotary machining center for machining eccentric deep holes in shaft parts includes: a machine tool 1, with a clamping bed 11 at one end and a drilling bed 12 at the other end; a hydraulic chuck 2 is mounted and connected to one end of the clamping bed 11, and multiple placement seats 21 are provided on the clamping bed 11; a hydraulic center support 22 is mounted and connected to one end of the drilling bed 12, and a gun drill rod 3 is provided on the drilling bed 12; a dual rotary drilling system including a main base plate 4, a beam frame 41 fixedly connected to the main base plate 4, a mounting plate 42 provided on the beam frame 41, a ball drive base block 43 provided on the lower side surface of the main base plate 4, two symmetrical bosses 44 provided on the drilling bed 12, a transverse shaft 45 rotatably connected between the two bosses 44, a ball drive back block 46 provided at the middle position of the mounting plate 42, and a longitudinal shaft 47 rotatably connected between the beam frame 41 and the main base plate 4.

[0020] In the specific implementation process, refer to Figure 2 and Figure 3 As shown, the transverse shaft 45 is a threaded rod, and the ball drive base block 43 is threadedly connected to the transverse shaft 45. The longitudinal shaft 47 is a threaded rod, and the ball drive back block 46 is threadedly connected to the longitudinal shaft 47.

[0021] It should be noted that the present invention adopts a dual lead screw transmission structure with a transverse axis 45 and a longitudinal axis 47. Utilizing the characteristics of high precision, small transmission clearance, and good self-locking performance of the lead screw thread transmission, it can realize micro-precision feed and position locking of the drilling structure in the transverse and longitudinal directions respectively, effectively ensuring the adjustment accuracy of the X and Y axis coordinates, eliminating the problem of drill rod position offset and loosening during the machining process, and providing reliable structural support for subsequent synchronous revolution of eccentric holes and high-precision drilling.

[0022] refer to Figure 2 and Figure 3 As shown, two transverse rolling tracks 5 are symmetrically arranged on the main seat plate 4. Both ends of the main seat plate 4 are provided with main ball bearing blocks 51. The two main ball bearing blocks 51 are slidably connected to the two transverse rolling tracks 5 respectively. Both ends of the beam frame 41 are provided with longitudinal rolling tracks 52. Both ends of the mounting plate 42 are provided with secondary ball bearing blocks 53. The two secondary ball bearing blocks 53 are slidably connected to the two longitudinal rolling tracks 52 respectively.

[0023] It should be noted that the guide structure of the horizontal and vertical bidirectional rolling tracks combined with the ball bearing blocks can significantly reduce the mechanical friction resistance in the lead screw transmission process, making the horizontal movement and lifting adjustment of the drilling structure more stable and smooth, without jamming or swaying. At the same time, it can effectively offset the processing vibration, improve the repeatability of the equipment, and ensure the consistency and stability of batch processing.

[0024] refer to Figure 3As shown, a main motor 6 is installed on the drilling machine 12. The output end of the main motor 6 is fixedly connected to the transverse shaft 45. An auxiliary motor 61 is installed at the top of the beam frame 41. The output end of the auxiliary motor 61 is fixedly connected to the longitudinal shaft 47.

[0025] It should be noted that this device adopts a dual-motor independent drive structure. The main motor 6 independently controls the operation of the transverse axis 45 to achieve precise displacement of the drilling structure in the X-axis direction. The auxiliary motor 61 independently controls the operation of the longitudinal axis 47 to achieve Y-axis lifting and lowering adjustment. The two axes do not interfere with each other and are independently controlled. With the interpolation calculation of the CNC system, it can accurately fit any eccentric trajectory and adapt to the synchronous revolution machining requirements of shaft parts with different eccentricities.

[0026] refer to Figure 1 and Figure 5 As shown, the clamping bed 11 has an opening slot in the middle, and a quick-release stabilizing mechanism is provided in the opening slot. The quick-release stabilizing mechanism includes two stabilizing brackets 7, which are symmetrically arranged in the opening slot. A back plate 71 is provided in the opening slot, and a lifting component is provided between the back plate 71 and the opening slot. Each of the two stabilizing brackets 7 has multiple mounting holes, and each of the multiple mounting holes has an embedded wheel 72. The multiple embedded wheels 72 are rotatably connected to the inner wall of the mounting hole through a pin 721. A main shaft 73 is fixedly connected to the lower end of each of the two stabilizing brackets 7. The two main shafts 73 are rotatably connected to the two ends of the back plate 71, respectively. A gear 74 is fixedly connected to each of the two main shafts 73. A rack 75 is provided on the lower side of each of the two gears 74. The two racks 75 mesh with the two gears 74, and the two gears 74 are staggered.

[0027] It should be noted that the two sets of staggered gears 74 mesh with the rack 75, enabling the left and right sets of stabilizing brackets 7 to open and close synchronously in opposite directions. The opening and closing actions are symmetrical and the force is evenly distributed, ensuring that the workpiece is centrally supported and avoiding unilateral offset. At the same time, the freely rotatable embedded wheel 72 on the stabilizing bracket 7 can flexibly fit against the outer circle of the workpiece, reducing frictional resistance during workpiece rotation processing, preventing scratches and wear on the outer circle of the workpiece, and balancing support stability and workpiece protection.

[0028] refer to Figure 5 and Figure 6 As shown, a base frame 8 is fixedly connected to the lower end of the back plate 71. A horizontal block 81 is provided on each of the two racks 75. Two limiting rods 82 are symmetrically provided on the base frame 8. The two horizontal blocks 81 are slidably connected to the two limiting rods 82 respectively. A spring 83 is sleeved on each of the two limiting rods 82. A side block 84 is provided on the side wall of each of the two horizontal blocks 81. An auxiliary wheel 85 is installed and connected in each of the two side blocks 84.

[0029] It should be noted that: the limiting rod 82 forms a linear sliding limit on the horizontal block 81, ensuring that the opening and closing trajectory of the stable support 7 is regular and does not deviate. Combined with the buffer structure of the spring 83, it enables adaptive flexible buffering support during the workpiece lowering process, avoiding workpiece deformation and equipment structural wear caused by hard impacts. The auxiliary wheel 85 further reduces lateral motion friction, improving the smoothness of mechanism adjustment and extending its service life.

[0030] refer to Figure 6 As shown, an extension block 86 is provided below each of the two horizontal blocks 81. Two through slots are symmetrically provided on the base frame 8. The two extension blocks 86 are slidably connected to the two through slots respectively. Side plates 9 are provided at both ends of the base frame 8. A central shaft 91 is rotatably connected between the two side plates 9. The two ends of the central shaft 91 are provided with threads in opposite directions. The two extension blocks 86 are threadedly connected to the two ends of the central shaft 91 respectively.

[0031] It should be noted that the central shaft 91 adopts a forward and reverse reverse thread structure at both ends. Rotating the central shaft 91 can drive the two side extension blocks 86 to move synchronously towards or away from each other. The linear limit sliding is achieved by using the limit through groove, which can accurately adjust the limit sliding stroke of the horizontal block 81, thereby limiting the maximum opening angle of the stabilizer 7. The structure has strong linkage, high adjustment accuracy, and convenient operation.

[0032] refer to Figure 5 and Figure 6 As shown, one end of the central shaft 91 extends to the outside of the side plate 9. Two arc-shaped pieces 92 are symmetrically provided at one end of the central shaft 91. An alignment cap 93 is provided on the central shaft 91. A rotating wheel 94 is installed and connected to one end of the central shaft 91. A thread is provided at the end of the central shaft 91. The cap opening of the alignment cap 93 is threaded to the central shaft 91. The cap tail of the alignment cap 93 is aligned with the two arc-shaped pieces 92.

[0033] It should be noted that the end arc-shaped piece 92 and the threaded alignment cap 93 cooperate with each other to accurately align and lock the installation position of the rotating wheel 94, effectively preventing problems such as loosening, offset, and increased play that may occur when the rotating wheel 94 is manually rotated for a long time. This ensures that the rotation angle of the central shaft 91 is accurately controllable and can maintain stable adjustment accuracy even after long-term use, thereby improving the reliability and durability of the equipment.

[0034] The working principle of the dual rotary machining center for machining eccentric deep holes in shaft parts provided by this invention is as follows: This machine tool addresses the industry pain points of low accuracy and poor stability in traditional shaft eccentric deep hole machining by innovatively adopting a dual rotary machining mode in which the workpiece and the tool rotate in opposite directions. Combined with a CNC (existing technology) synchronous interpolation control structure and an adaptive fast support mechanism, it achieves high-precision eccentric deep hole drilling, completely breaking the technical limitation of traditional eccentric hole machining that can only rotate a single tool. The overall machining process is divided into four core links: workpiece clamping and positioning, dual rotary drilling control, adaptive support assistance, and synchronous drilling and forming.

[0035] (I) Workpiece clamping and positioning principle The machine tool 1 is divided into two main functional areas: a left-end clamping bed 11 and a right-end drilling bed 12, forming a stable machining support base. On the left side of the workpiece, the hydraulic chuck 2 on the clamping bed 11 holds one end of the workpiece's outer diameter, achieving centering and power transmission. On the right side of the workpiece, the hydraulic center support 22 on the drilling bed 12 assists in supporting the other end of the outer diameter, effectively improving the structural rigidity and rotational accuracy of long shaft-type workpieces during machining, preventing workpiece wobbling and displacement, and laying the foundation for high-precision deep hole machining. Simultaneously, the clamping bed 11 is equipped with multiple placement seats 21, enabling neat placement of workpieces and adapting to the clamping requirements of shaft-type parts of different specifications.

[0036] (II) Core Working Principle of Dual Rotary Drilling System The dual-rotation drilling system is the core functional structure of this machine tool 1. Relying on the three-axis adjustable structure and the dual-motor lead screw drive structure, it achieves synchronous coordination of the drill rod's rotation and revolution, ensuring the machining accuracy of the eccentric hole. The system uses the main base plate 4 as the base, and is equipped with a beam frame 41, mounting plate 42, bidirectional lead screw transmission assembly and rolling guide rail structure to achieve high-precision position control.

[0037] In terms of power drive, the main motor 6 of the drilling machine 12 provides power to the transverse axis 45 (threaded rod), driving the ball drive block 43 to move horizontally along the transverse axis 45, realizing the transverse movement of the drilling structure along the X-axis; the auxiliary motor 61 at the top of the beam frame 41 drives the longitudinal axis 47 (threaded rod) to rotate, driving the ball drive back block 46 to move longitudinally, realizing the Y-axis lifting and lowering adjustment. At the same time, the main base plate 4 is equipped with two sets of transverse rolling rails 5 and ball main clamping blocks 51, and the beam frame 41 is equipped with longitudinal rolling rails 52 and ball auxiliary clamping blocks 53. The sliding cooperation realizes the precise guidance of the displacement of the drilling structure, eliminates deviation and jamming, and ensures motion accuracy.

[0038] In terms of dual-rotation machining, during machining, the hydraulic chuck 2 drives the workpiece to rotate counterclockwise around its own axis, causing the eccentric hole to be machined on the workpiece to rotate synchronously with the workpiece. At the same time, the drill rod 3 rotates clockwise under the drive of a variable frequency motor (existing technology), realizing the basic drilling function. The core innovation lies in using a CNC system (existing technology) to program and control the X and Y axis servo interpolation motion, driving the drill rod 3 to revolve synchronously with the rotation trajectory of the eccentric hole on the workpiece, always keeping the drill rod axis and the eccentric hole axis coincide in real time, so that the drill rod and the eccentric hole position remain in a relatively static state, perfectly adapting to the dual-rotation machining mode of eccentric holes, and completely solving the problem of excessive deviation caused by the fixed workpiece and single rotation of the tool in traditional eccentric hole machining.

[0039] (III) Adaptive Working Principle of Quick-Stabilizing Mechanism The quick-release support mechanism located at the central opening slot of the clamping bed 11 enables adaptive adjustment of workpiece placement and support, improving clamping convenience and machining stability. The core of the mechanism consists of two symmetrically arranged support frames 7, each equipped with multiple sets of embedded wheels 72 with pins 721, which can flexibly conform to the outer circle of shaft-type workpieces to achieve flexible support.

[0040] The mechanism employs a transmission structure with gears 74 and racks 75 meshing. The main shafts 73 at the lower ends of the two stabilizing brackets 7 are equipped with staggered gears 74, which mesh with corresponding racks 75 to achieve bidirectional synchronous opening and closing movements. The limiting rod 82, the cross block 81, and the spring 83 of the base frame 8 form a buffer limiting assembly. When the workpiece is lowered, the stabilizing bracket 7 can automatically adjust the opening angle according to the workpiece specifications, and the spring 83 buffers and achieves adaptive fitting and support, allowing the workpiece to be placed and supported quickly.

[0041] Meanwhile, the operator can pre-rotate the rotating wheel 94, driving the central shaft 91 to rotate. The reverse threads at both ends of the central shaft 91 drive the two sets of extension blocks 86 to move relative to each other, precisely adjusting the limit movement distance of the cross block 81. This limits the maximum opening angle of the support bracket 7, adapting to shaft parts of different diameters. The through-slots between the extension block 86 and the base frame 8, and the sliding fit structure between the cross block 81 and the limiting rod 82, ensure a smooth and precise adjustment process. The structure of the auxiliary wheel 85 and the side block 84 further reduces motion friction, improving the flexibility and service life of the mechanism.

[0042] (iv) Integral processing and molding principle After the workpiece is clamped and positioned, the CNC system (existing technology) synchronously controls the workpiece rotation, drill rod rotation, and revolution. The workpiece rotates counterclockwise, and the drill rod rotates clockwise in the opposite direction. Combined with high-precision interpolation compensation on the X and Y axes, this ensures the drilling trajectory perfectly matches the eccentric hole design trajectory. During machining, the hydraulic center support 22 and the quick-release stabilizing mechanism provide dual protection for workpiece stability. The dual rotational motions mutually cancel out machining stress, ultimately achieving high-precision forming of the eccentric deep hole. After machining, the eccentric hole deviation can be stably controlled within the range of 0.5 / 1000 × hole depth.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dual rotary machining center for machining eccentric deep holes in shaft-type parts, characterized in that, include: A machine tool (1) is provided with a clamping bed (11) at one end and a drilling machine (12) at the other end. A hydraulic chuck (2) is installed and connected to one end of the clamping bed (11). Multiple placement seats (21) are provided on the clamping bed (11). A hydraulic center frame (22) is installed and connected to one end of the drilling machine (12). A gun drill rod (3) is provided on the drilling machine (12). A dual-rotary drilling system includes a main base plate (4), a beam frame (41) fixedly connected to the main base plate (4), an mounting plate (42) provided on the beam frame (41), a ball drive bottom block (43) provided on the lower side plate of the main base plate (4), two bosses (44) symmetrically provided on the drilling machine (12), a transverse shaft (45) rotatably connected between the two bosses (44), a ball drive back block (46) provided at the middle position of the mounting plate (42), and a longitudinal shaft (47) rotatably connected between the beam frame (41) and the main base plate (4).

2. The double rotary machining center for machining eccentric deep holes in shaft parts according to claim 1, characterized in that, The transverse shaft (45) is a threaded rod, the ball drive base block (43) is threadedly connected to the transverse shaft (45), the longitudinal shaft (47) is a threaded rod, and the ball drive back block (46) is threadedly connected to the longitudinal shaft (47).

3. A double rotary machining center for machining eccentric deep holes in shaft-type parts according to claim 1, characterized in that, Two transverse rolling tracks (5) are symmetrically arranged on the main seat plate (4). Both ends of the main seat plate (4) are provided with main ball bearing blocks (51). The two main ball bearing blocks (51) are slidably connected to the two transverse rolling tracks (5). Both ends of the beam frame (41) are provided with longitudinal rolling tracks (52). Both ends of the mounting plate (42) are provided with secondary ball bearing blocks (53). The two secondary ball bearing blocks (53) are slidably connected to the two longitudinal rolling tracks (52).

4. A double rotary machining center for machining eccentric deep holes in shaft-type parts according to claim 1, characterized in that, A main motor (6) is installed on the drilling machine (12), and the output end of the main motor (6) is fixedly connected to the transverse shaft (45). An auxiliary motor (61) is installed at the top of the beam frame (41), and the output end of the auxiliary motor (61) is fixedly connected to the longitudinal shaft (47).

5. A double rotary machining center for machining eccentric deep holes in shaft-type parts according to claim 1, characterized in that, The clamping bed (11) has an opening slot at its center, and a quick-release stabilizing mechanism is provided at the opening slot. The quick-release stabilizing mechanism includes two stabilizing brackets (7), which are symmetrically arranged in the opening slot. A back plate (71) is provided in the opening slot, and a lifting assembly is provided between the back plate (71) and the opening slot. Each of the two stabilizing brackets (7) has multiple mounting holes, and each of the multiple mounting holes has an embedded wheel (72). The multiple embedded wheels (72) are all connected to the opening slot. The pin (721) is rotatably connected to the inner wall of the mounting port. The lower ends of the two support brackets (7) are fixedly connected to the main shaft (73). The two main shafts (73) are rotatably connected to the two ends of the back plate (71). The two main shafts (73) are fixedly connected to the gears (74). The lower side of the two gears (74) is provided with racks (75). The two racks (75) mesh with the two gears (74) respectively. The two gears (74) are staggered.

6. A double rotary machining center for machining eccentric deep holes in shaft-type parts according to claim 5, characterized in that, A base frame (8) is fixedly connected to the lower end of the back plate (71). A horizontal block (81) is provided on each of the two racks (75). Two limiting rods (82) are symmetrically provided on the base frame (8). The two horizontal blocks (81) are slidably connected to the two limiting rods (82) respectively. A spring (83) is sleeved on each of the two limiting rods (82). A side block (84) is provided on the side wall of each of the two horizontal blocks (81). An internal wheel (85) is installed in each of the two side blocks (84).

7. A double rotary machining center for machining eccentric deep holes in shaft-type parts according to claim 6, characterized in that, An extension block (86) is provided below each of the two horizontal blocks (81). Two through slots are symmetrically provided on the base frame (8). The two extension blocks (86) are slidably connected to the two through slots respectively. Side plates (9) are provided at both ends of the base frame (8). A central shaft (91) is rotatably connected between the two side plates (9). The two ends of the central shaft (91) are provided with threads of opposite directions. The two extension blocks (86) are threadedly connected to the two ends of the central shaft (91) respectively.

8. A double rotary machining center for machining eccentric deep holes in shaft parts according to claim 7, characterized in that, One end of the central shaft (91) extends to the outside of the side plate (9). Two arc-shaped pieces (92) are symmetrically provided at one end of the central shaft (91). An alignment cap (93) is provided on the central shaft (91). A rotating wheel (94) is installed and connected to one end of the central shaft (91). A thread is provided at the end of the central shaft (91). The cap opening of the alignment cap (93) is threaded to the central shaft (91). The cap tail of the alignment cap (93) is aligned with the two arc-shaped pieces (92).

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