Numerical control milling machine with multi-hole-site synchronous machining function

Abstract

The invention relates to the technical field of numerical control machine tools, and discloses a numerical control milling machine with a multi-hole-site synchronous machining function, which comprises a machine body, a workpiece mounting table, a first lifting driving mechanism, a lifting table, at least two distance adjusting tables and a control system. The workpiece mounting table is mounted on the machine body; the first lifting driving mechanism is mounted on the machine body; the output part of the first lifting driving mechanism is in driving connection with the lifting table; the lifting platform is provided with a first horizontal driving mechanism; the output part of the first horizontal driving mechanism is in driving connection with at least one distance adjusting table, so that the horizontal distance between the two distance adjusting tables is adjustable; the two distance adjusting tables are each provided with at least one second horizontal driving mechanism, each distance adjusting table is provided with at least two main shaft units, and the output portion of each second horizontal driving mechanism is in driving connection with at least one of the two main shaft units arranged on the same distance adjusting table. Therefore, the horizontal distance between the two main shaft units arranged on the same distance adjusting table can be adjusted. The hole distance between multiple spindles can be adjusted.

Description

A CNC milling machine with multi-hole synchronous machining function Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and in particular to a CNC milling machine with multi-hole synchronous machining function. Background Technology

[0002] In the field of machining, efficient and high-precision machining of multi-hole systems (such as flange holes, connecting holes, and mounting holes) distributed on plate, disc, and shell parts is a common and important requirement. While sequential machining using traditional single-spindle CNC machine tools offers high flexibility, it is inefficient, and repeated clamping and positioning can easily introduce cumulative errors. Therefore, multi-hole synchronous machining technology has emerged. By integrating multiple spindles into a machine tool, it enables simultaneous drilling, milling, or tapping of multiple holes on a workpiece, significantly improving machining efficiency and inter-hole positional accuracy.

[0003] The traditional method for achieving synchronous machining of multiple holes is to distribute a single input power to multiple output spindles synchronously through a rigid gearbox or multi-spindle unit. The disadvantage of this method is that the hole spacing between the spindles is rigidly fixed by the gearbox structure and cannot be adjusted, which needs to be improved. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a CNC milling machine with multi-hole synchronous machining function, which realizes the adjustable hole spacing between multiple spindles.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A CNC milling machine with multi-hole synchronous machining function includes: a machine body, a workpiece mounting table, a first lifting drive mechanism, a lifting table, at least two adjusting tables, and a control system.

[0007] The workpiece mounting table is mounted on the machine body;

[0008] The first lifting drive mechanism is mounted on the machine body;

[0009] The output of the first lifting drive mechanism is connected to the lifting platform; the lifting platform is equipped with a first horizontal drive mechanism.

[0010] The output of the first horizontal drive mechanism is driven to connect to at least one of the adjusting tables, so that the horizontal distance between the two adjusting tables is adjustable; each of the two adjusting tables is equipped with at least one second horizontal drive mechanism, and each adjusting table is equipped with at least two spindle units. The output of the second horizontal drive mechanism is driven to connect to at least one of the two spindle units located on the same adjusting table, so that the horizontal distance between the two spindle units located on the same adjusting table is adjustable; the spindle unit is used for drilling and milling workpieces.

[0011] The control system is electrically connected to the first lifting drive mechanism, the first horizontal drive mechanism, and the second horizontal drive mechanism, respectively.

[0012] Furthermore, the first horizontal drive mechanism includes a first threaded rod, a first guide rod, and a first rotary drive motor; the first rotary drive motor is mounted on the lifting platform, and the first threaded rod and the first guide rod are arranged in parallel; at least one of the adjusting platforms is provided with a first threaded through hole and a first guide through hole, the first threaded rod is threadedly engaged with the first threaded through hole, and the first guide rod is adapted to the first guide through hole; the output end of the first rotary drive motor is driven and connected to the first threaded rod, and the first rotary drive motor is electrically connected to the control system.

[0013] Furthermore, both of the adjusting platforms are provided with the first threaded through hole and the first guide through hole; the two ends of the first threaded rod have two sections of thread with opposite directions of rotation, and the two sections of thread respectively engage with the first threaded through hole on one of the adjusting platforms.

[0014] Furthermore, the second horizontal drive mechanism includes a second threaded rod, a second guide rod, and a second rotary drive motor; the second rotary drive motor is mounted on the adjusting table, and the second threaded rod and the second guide rod are arranged in parallel; at least one spindle unit on the same adjusting table is provided with a second threaded through hole and a second guide through hole, the second threaded rod is threadedly engaged with the second threaded through hole, and the second guide rod is adapted to the second guide through hole; the output end of the second rotary drive motor is driven and connected to the second threaded rod, and the second rotary drive motor is electrically connected to the control system.

[0015] Furthermore, both spindle units located on the same adjusting platform are provided with the second threaded through hole and the second guide through hole; the two ends of the second threaded rod have two sections of thread with opposite directions of rotation, and the two sections of thread respectively engage with the second threaded through hole on one of the two spindle units located on the same adjusting platform.

[0016] Furthermore, the second horizontal drive mechanisms on the two adjustable platforms are staggered in the vertical direction; multiple spindle units are located on the same horizontal line.

[0017] Furthermore, the first lifting drive mechanism includes a third threaded rod, a third guide rod, and a third rotary drive motor; the third rotary drive motor is mounted on the machine body, and the third threaded rod and the third guide rod are arranged in parallel; the lifting platform is provided with a third threaded through hole and a third guide through hole, the third threaded rod is threadedly engaged with the third threaded through hole, and the third guide rod is adapted to the third guide through hole; the output end of the third rotary drive motor is driven and connected to the third threaded rod, and the third rotary drive motor is electrically connected to the control system.

[0018] Furthermore, the top of the machine body is also provided with a pressing and limiting mechanism, which includes a second lifting drive mechanism and a pressure plate. The output of the second lifting drive mechanism is driven and connected to the pressure plate, and the second lifting drive mechanism is electrically connected to the control system. The top end faces of the multiple spindle units are flush. The horizontal projected area of ​​the pressure plate covers all areas that the spindle units can reach in the horizontal plane.

[0019] Furthermore, the top end faces of the plurality of spindle units extend downward at an angle away from the lifting platform; the bottom of the pressure plate is provided with an inclined pressing surface, the inclination angle of the pressing surface being consistent with the inclination angle of the top end face of the spindle unit.

[0020] Furthermore, there are two second lifting drive mechanisms, which are distributed at intervals along the moving direction of the plurality of main shaft units; the output parts of both second lifting drive mechanisms are hinged to the top of the pressure plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. Based on an architecture with at least two adjusting stages, each stage equipped with at least two spindle units, and a two-stage horizontal spacing adjustable design with a first horizontal drive mechanism driving the adjusting stages and a second horizontal drive mechanism driving the spindle units, this structure transforms the machine tool from a dedicated device capable only of processing fixed hole spacings. By adjusting the "group spacing" between the two adjusting stages through the first horizontal drive mechanism, it can quickly adapt to changes in the center distance between different hole groups or areas on the workpiece. By adjusting the "intra-group hole spacing" of the two spindle units on each adjusting stage through the second horizontal drive mechanism, it can precisely match the distribution of holes within the same group. This two-stage adjustable mechanism allows a single machine tool to be quickly programmed and adjusted without hardware replacement, enabling the simultaneous processing of multiple workpieces with completely different hole spacing layouts. This improves the versatility and production efficiency of the equipment, reduces the cost of equipping different products with dedicated tooling or machine tools, and achieves flexibility and high adaptability in the machine tool's processing range.

[0023] 2. Based on the structural layout of the output unit of the first lifting drive mechanism driving the lifting platform, and the integrated control method of the control system electrically connecting the first lifting drive mechanism, the first horizontal drive mechanism and the second horizontal drive mechanism respectively, all spindle units are ultimately installed on the same lifting platform driven by the first lifting drive mechanism. This means that during machining feed, all spindle units are driven by the same power source and perform completely synchronized vertical movements. This mechanical rigid synchronization fundamentally ensures the consistency of depth, feed speed and axis parallelism of all machined holes, avoiding the cumulative error and asynchronous problems that may occur when using multiple independent Z-axis. With the unified coordination of the control system for each level of drive mechanism, the entire process from precise positioning to synchronous machining is stable and reliable. It is particularly suitable for high-precision parts machining with strict requirements for hole group position and depth, and achieves a fundamental improvement in the accuracy and consistency of multi-hole machining.

[0024] 3. Based on the centralized control mode of the control system, which electrically connects the first lifting drive mechanism, the first horizontal drive mechanism, and the second horizontal drive mechanism respectively, and the fixed workpiece method of mounting the workpiece on the machine body, this design integrates the complex multi-level position adjustment and machining feed into a single CNC system. The operator only needs to input the coordinate program of the target hole position, and the control system can automatically command the first and second horizontal drive mechanisms to move sequentially, quickly and accurately positioning all spindle units to the target position. Subsequently, with one-button start, the control system commands the first lifting drive mechanism to drive all spindle units to synchronously complete the drilling and milling operation. This changes the cumbersome "indexing, positioning, single-hole machining" cycle mode in traditional multi-hole machining, compressing multiple processes into "one-time positioning, one-time synchronous machining", reducing auxiliary time, increasing the proportion of pure cutting time of the machine tool, thereby improving production efficiency and realizing full-process automation and high efficiency from positioning setting to machining completion. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the structure of a CNC milling machine with multi-hole synchronous machining function according to the present invention;

[0026] Figure 2 is a structural schematic diagram of the fuselage and the clamping and limiting mechanism shown in Figure 1;

[0027] Figure 3 is a structural schematic diagram of the lifting platform and adjusting platform shown in Figure 1;

[0028] Figure 4 is a schematic diagram of the adjustment table and spindle unit shown in Figure 1.

[0029] In the diagram: 1. Machine body; 2. Workpiece mounting platform; 3. First lifting drive mechanism; 31. Third threaded rod; 32. Third guide rod; 33. Third rotary drive motor; 4. Lifting platform; 41. Third threaded through hole; 42. Third guide through hole; 5. First horizontal drive mechanism; 51. First threaded rod; 52. First guide rod; 53. First rotary drive motor; 6. Adjustment platform; 61. First threaded through hole; 62. First guide through hole; 7. Second horizontal drive mechanism; 71. Second threaded rod; 72. Second guide rod; 73. Second rotary drive motor; 8. Spindle unit; 81. Second threaded through hole; 82. Second guide through hole; 9. Pressing and limiting mechanism; 91. Second lifting drive mechanism; 92. Pressure plate; 921. Pressing surface. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Referring to Figures 1-4, a preferred embodiment of the present invention provides a CNC milling machine with multi-hole synchronous machining function, comprising: a machine body 1, a workpiece mounting table 2, a first lifting drive mechanism 3, a lifting table 4, at least two adjusting tables 6, and a control system.

[0034] The workpiece mounting table 2 is mounted on the machine body 1. Preferably, two mutually perpendicular horizontal drive mechanisms are installed at the bottom of the machine body 1. The workpiece mounting table 2 is mounted on the machine body 1 through these two mutually perpendicular horizontal drive mechanisms, so that the horizontal position of the workpiece can be adjusted during the workpiece processing to achieve the desired processing effect.

[0035] The first lifting drive mechanism 3 is installed on the machine body 1; the output of the first lifting drive mechanism 3 drives and connects to the lifting platform 4; the lifting platform 4 is equipped with a first horizontal drive mechanism 5. The first lifting drive mechanism 3 drives the lifting platform 4 to move vertically as a whole, ensuring that the multi-hole positions of the CNC milling machine move synchronously in the vertical direction.

[0036] The output of the first horizontal drive mechanism 5 is driven to connect to at least one of the adjusting tables 6, so that the horizontal distance between the two adjusting tables 6 is adjustable. The first horizontal drive mechanism 5, mounted on the lifting platform 4, drives at least one adjusting table 6 to move horizontally, thereby changing the overall distance between the two adjusting tables 6, which is used to accommodate the center distance between hole groups on different workpieces. At least one second horizontal drive mechanism 7 is mounted on each of the two adjusting tables 6. Each adjusting table 6 is equipped with at least two spindle units 8. The output of the second horizontal drive mechanism 7 is driven to connect to at least one of the two spindle units 8 located on the same adjusting table 6, so that the horizontal distance between the two spindle units 8 located on the same adjusting table 6 is adjustable. The second horizontal drive mechanism 7, mounted on each adjusting table 6, drives at least one spindle unit 8 on the same adjusting table 6 to move horizontally, thereby changing the hole distance between two spindle units 8 within the same group. The spindle unit 8 is used for drilling and milling workpieces. The spindle unit 8 includes a spindle housing and a spindle drive system for clamping tools and driving tool rotation.

[0037] The control system is electrically connected to the first lifting drive mechanism 3, the first horizontal drive mechanism 5, and the second horizontal drive mechanism 7, respectively. The control system commands the above three-stage drive mechanisms in a unified manner. Before machining, the first horizontal drive mechanism 5 and the second horizontal drive mechanism 7 are started according to the program to adjust all spindles to the target coordinates. During machining, the first lifting drive mechanism 3 is started, and all spindles perform drilling and milling operations synchronously.

[0038] The working principle of a CNC milling machine with multi-hole synchronous machining function according to the present invention is as follows: First, the workpiece mounting table 2 installed on the machine body 1 is used to fix the workpiece; before machining, the control system instructs the first horizontal drive mechanism 5 to adjust the horizontal distance between the two adjusting tables 6 (inter-group adjustment), and simultaneously instructs the second horizontal drive mechanism 7 on each adjusting table 6 to adjust the horizontal distance between its two corresponding spindle units 8 (intra-group adjustment), thereby positioning the cutter heads of all spindle units 8 to the two-dimensional coordinates corresponding to the target hole position of the workpiece; after positioning, the control system instructs the first lifting drive mechanism 3 to synchronously drive the entire lifting table 4 and all the adjusted spindle units 8 downward to perform synchronous drilling and milling machining on all preset holes in one go. The entire process is centrally controlled and coordinated by the control system.

[0039] Based on an architecture with at least two adjusting stages 6, each adjusting stage 6 having at least two spindle units 8, and a two-stage horizontal spacing adjustable design with a first horizontal drive mechanism 5 driving the adjusting stages 6 and a second horizontal drive mechanism 7 driving the spindle units 8, this structure transforms the machine tool from a dedicated device capable only of processing fixed hole spacings. By adjusting the "group spacing" between the two adjusting stages 6 through the first horizontal drive mechanism 5, it can quickly adapt to changes in the center distance between different hole groups or areas on the workpiece. By adjusting the "intra-group hole spacing" of the two spindle units 8 on each adjusting stage 6 through the second horizontal drive mechanism 7, it can precisely match the distribution of holes within the same group. This two-stage adjustable mechanism allows a machine tool to be quickly programmed and adjusted without changing the hardware, enabling the simultaneous processing of multiple workpieces with completely different hole spacing layouts. This improves the versatility and production efficiency of the equipment, reduces the cost of equipping special tooling or machine tools for different products, and achieves flexibility and high adaptability in the machine tool's processing range.

[0040] Based on the structural layout of the output section of the first lifting drive mechanism 3 driving and connecting the lifting platform 4, and the integrated control method of the control system electrically connecting the first lifting drive mechanism 3, the first horizontal drive mechanism 5 and the second horizontal drive mechanism 7 respectively, all spindle units 8 are ultimately installed on the same lifting platform 4 driven by the first lifting drive mechanism 3. This means that during machining feed, all spindle units 8 are driven by the same power source and perform completely synchronized vertical movements. This mechanical rigid synchronization fundamentally ensures the consistency of depth, feed speed and axis parallelism of all machined holes, avoiding the cumulative error and asynchronous problems that may occur when using multiple independent Z-axis. With the unified coordination of the control system for each level of drive mechanism, the entire process from precise positioning to synchronous machining is stable and reliable. It is particularly suitable for high-precision parts machining with strict requirements for hole group position and depth, and achieves a fundamental improvement in the accuracy and consistency of multi-hole machining.

[0041] Based on the centralized control mode of the control system, which electrically connects the first lifting drive mechanism 3, the first horizontal drive mechanism 5, and the second horizontal drive mechanism 7 respectively, and the workpiece mounting table 2 is installed on the machine body 1 to fix the workpiece, this design integrates the complex multi-level position adjustment and machining feed into a single CNC system. The operator only needs to input the coordinate program of the target hole position, and the control system can automatically command the first horizontal drive mechanism 5 and the second horizontal drive mechanism 7 to move sequentially, quickly and accurately positioning all spindle units 8 to the target position. Then, with one key start, the control system commands the first lifting drive mechanism 3 to drive all spindle units 8 to synchronously complete the drilling and milling operation. This changes the cumbersome "indexing, positioning, single hole machining" cycle mode in traditional multi-hole machining, compressing multiple processes into "one-time positioning, one-time synchronous machining", reducing auxiliary time, increasing the proportion of pure cutting time of the machine tool, thereby improving production efficiency and realizing full-process automation and high efficiency from positioning setting to machining completion.

[0042] Preferably, the first horizontal drive mechanism 5 includes a first threaded rod 51, a first guide rod 52, and a first rotary drive motor 53; the first rotary drive motor 53 is mounted on the lifting platform 4, and the first threaded rod 51 and the first guide rod 52 are arranged in parallel; at least one adjusting platform 6 is provided with a first threaded through hole 61 and a first guide through hole 62, the first threaded rod 51 is threadedly engaged with the first threaded through hole 61, and the first guide rod 52 is adapted to the first guide through hole 62; the output end of the first rotary drive motor 53 drives the first threaded rod 51, and the first rotary drive motor 53 is electrically connected to the control system. Preferably, there are two first guide rods 52, and the two first guide rods 52 are arranged symmetrically above and below the first threaded rod 51. The first rotary drive motor 53 drives the first threaded rod 51 to rotate, and the adjusting platform 6, which engages with the first threaded rod 51 through the first threaded through hole 61, converts the rotational motion of the first threaded rod 51 into its own precise linear motion under the constraint of the first guide rod 52, thereby achieving horizontal displacement. Threaded drives offer high transmission accuracy and self-locking properties. Guide rods prevent moving parts from rotating or jamming, ensuring precise and smooth adjustment. Rotary motors readily accept pulse or analog control from CNC systems, enabling accurate positioning.

[0043] Preferably, both adjusting platforms 6 are provided with a first threaded through hole 61 and a first guide through hole 62; the first threaded rod 51 has two sections of threads with opposite directions of rotation at both ends, and the two sections of threads respectively engage with the first threaded through hole 61 on one of the adjusting platforms 6. The first threaded rod 51 has threads with opposite directions of rotation at both ends, which are threadedly connected to the two adjusting platforms 6 respectively. When the first threaded rod 51 rotates, the two adjusting platforms 6 produce linear motion at the same speed in opposite directions due to the opposite directions of rotation of the threads. Replacing the two independent systems required to drive the two platforms with a single motor and a threaded rod greatly simplifies the mechanical structure and reduces costs and potential failure points; the rigid mechanical connection ensures that the movement of the two platforms is completely synchronized and the distance change is absolutely symmetrical, eliminating the errors that may be caused by electronic synchronization, and providing high adjustment accuracy and reliability; the center distance adjustment can be completed with a single command drive, making the operation simple and efficient.

[0044] As an alternative configuration, the first horizontal drive mechanism 5 employs a rack and pinion synchronization mechanism. A rotatable synchronous shaft is mounted on the lifting platform 4, with gears of the same specification fixed at both ends. Each adjusting platform 6 is equipped with a rack that meshes with the gears, and the two racks are arranged face-to-face. When the motor drives the synchronous shaft to rotate, the gears at both ends rotate synchronously, driving the two adjusting platforms 6 to perform precise linear movements in opposite directions. The rack and pinion synchronization mechanism has a compact structure, good transmission rigidity, and can achieve higher speeds, but its accuracy is slightly lower than that of a high-precision lead screw, and the accuracy problem at the rack-pinion joint needs to be addressed. It is suitable for applications requiring... For scenarios requiring rapid pitch adjustment and slightly lower absolute precision requirements, the first horizontal drive mechanism 5 can also employ a synchronous belt linkage mechanism. This mechanism uses a closed annular synchronous belt, with two pitch adjustment platforms 6 fixed on the two parallel sides of the synchronous belt. When the drive motor drives the drive wheel to rotate, the synchronous belt transmission forces the two pitch adjustment platforms 6 to move synchronously in opposite directions. The synchronous belt linkage mechanism has lower cost and lower operating noise, making it suitable for long-stroke adjustment. However, its transmission rigidity is relatively poor, and it is prone to elastic deformation. Its positioning accuracy and load-bearing capacity are not as good as those of lead screws and racks and pinions. It can be used in spindle systems with light loads and less stringent rigidity requirements.

[0045] Preferably, the second horizontal drive mechanism 7 includes a second threaded rod 71, a second guide rod 72, and a second rotary drive motor 73. The second rotary drive motor 73 is mounted on the adjusting platform 6, and the second threaded rod 71 and the second guide rod 72 are arranged in parallel. At least one spindle unit 8 on the same adjusting platform 6 is provided with a second threaded through hole 81 and a second guide through hole 82. The second threaded rod 71 is threaded into the second threaded through hole 81, and the second guide rod 72 is adapted to the second guide through hole 82. The output end of the second rotary drive motor 73 is driven and connected to the second threaded rod 71, and the second rotary drive motor 73 is electrically connected to the control system. Preferably, there are two second guide rods 72, and the two second guide rods 72 are arranged symmetrically above and below the second threaded rod 71. Through the cooperation of the second rotary drive motor 73, the second threaded rod 71, and the second guide rod 72, the spindle unit 8 on the same adjusting platform 6 is driven to achieve precise intra-group horizontal displacement. The fine positioning of the main spindle unit 8 provides a technical means with the same precision as the inter-group spacing adjustment, ensuring the hole spacing accuracy; the same mature drive scheme as the first horizontal drive mechanism 5 is adopted, which reduces the complexity of design, manufacturing and maintenance and improves the overall reliability of the machine.

[0046] Preferably, both spindle units 8 on the same adjusting platform 6 are provided with a second threaded through hole 81 and a second guide through hole 82; the two ends of the second threaded rod 71 have two sections of threads with opposite directions of rotation, and the two sections of threads respectively engage with the second threaded through hole 81 on one of the two spindle units 8 on the same adjusting platform 6. The second threaded rod 71 uses threads with opposite directions of rotation at both ends to drive the two spindle units 8 on the same adjusting platform 6 to move towards or away from each other. At the microscopic level, simplification and synchronization are achieved, and the symmetrical and synchronous adjustment of the two spindle units 8 is realized with a single drive unit, making the internal structure of each adjusting platform 6 very compact and efficient; combined with the first horizontal drive mechanism 5, it forms a fully symmetrical, single-motor drive adjustment system from "between groups" to "within groups".

[0047] Preferably, the second horizontal drive mechanisms 7 on the two adjusting tables 6 are staggered in the vertical direction; multiple spindle units 8 are located on the same horizontal line. The second horizontal drive mechanisms 7 (including motors, threaded rods, etc.) on the two adjusting tables 6 are not aligned in the vertical direction, but one is set higher and the other lower. This is a key engineering design for achieving a compact, multi-stage adjustable structure. It completely avoids collisions between the second horizontal drive mechanisms 7 on adjacent adjusting tables 6 during movement; it allows the two adjusting tables 6 to be closer together in the horizontal direction, thereby reducing the overall width of the machine tool or arranging more spindle units 8 in a limited space.

[0048] In another configuration, the second horizontal drive mechanism 7 includes a second rotary drive motor 73 mounted on the adjusting platform 6, a gear shaft driven by the motor, and a first rack and a second rack respectively fixed to the two main shaft units 8. The gear shaft is equipped with a double gear that meshes simultaneously with both the first and second racks; the tooth surfaces of the first and second racks face each other. When the motor drives the gear shaft to rotate, the double gear meshes with both racks simultaneously. Because the two racks are arranged face-to-face, the rotation of the gears forces them to make linear movements in opposite directions, thereby precisely adjusting the horizontal distance between the main shaft units 8. This structure is extremely compact, has extremely high rigidity, exhibits no elastic deformation during transmission, and its accuracy is guaranteed by the gear precision.

[0049] Preferably, the first lifting drive mechanism 3 includes a third threaded rod 31, a third guide rod 32, and a third rotary drive motor 33; the third rotary drive motor 33 is mounted on the body 1, and the third threaded rod 31 and the third guide rod 32 are arranged in parallel; the lifting platform 4 is provided with a third threaded through hole 41 and a third guide through hole 42, the third threaded rod 31 is threaded into the third threaded through hole 41, and the third guide rod 32 is adapted to the third guide through hole 42; the output end of the third rotary drive motor 33 drives and connects to the third threaded rod 31, and the third rotary drive motor 33 is electrically connected to the control system. Preferably, there are two third guide rods 32, and the two third guide rods 32 are arranged symmetrically with respect to the third threaded rod 31. Through the cooperation of the third rotary drive motor 33, the third threaded rod 31, and the third guide rod 32, the rotational motion is converted into the vertical lifting motion of the entire lifting platform 4. It provides high-precision and rigid power output for the synchronous feed of the entire multi-spindle system, which is the foundation for ensuring machining quality. All motion axes adopt a unified high-precision solution for rotary motors, threaded rods and guide rods, so that the overall machine design is harmonious and unified, the control strategy is consistent, and it is convenient to troubleshoot and repair in case of subsequent failures.

[0050] As an alternative configuration, the first lifting drive mechanism 3 is a dual-servo screw synchronous drive. Two independent high-power servo motors and high-load ball screws are symmetrically arranged on both sides or in the center of the machine body 1, jointly driving the same lifting platform 4. Through the electronic gear or master-slave following function of the control system, the speed and position of the two screws are strictly synchronized. The dual-servo screw synchronous drive solves the torque deficiency or stability problems that may exist with a single screw, and is especially suitable for wide-range, heavy-load lifting platforms 4. Its synchronization accuracy depends on the control algorithm and feedback elements. Although there is a theoretically small synchronization error, it can be controlled by modern CNC technology. The control is at an extremely high level; the first lifting drive mechanism 3 can also be directly driven by a linear motor. The primary (stator, i.e., magnetic grid) of the long-stroke linear motor is installed on the column of the machine body 1, and the secondary (mover, i.e., coil) of the linear motor is installed on the back of the lifting platform 4. The control system directly drives the linear motor to generate electromagnetic thrust, so that the lifting platform 4 can make linear motion without contact. The direct drive of the linear motor has extremely fast speed, extremely high acceleration, smooth movement without backlash, precision up to the nanometer level, and no mechanical maintenance required. However, it is extremely expensive, generates serious heat, requires complex cooling, has no self-locking when power is off, requires an additional brake, and has high requirements for dust and chip prevention.

[0051] Preferably, the top of the machine body 1 is further provided with a clamping and limiting mechanism 9, which includes a second lifting drive mechanism 91 and a pressure plate 92. The output of the second lifting drive mechanism 91 drives and connects to the pressure plate 92, and the second lifting drive mechanism 91 is electrically connected to the control system. The top end faces of the multiple spindle units 8 are flush. The horizontal projected area of ​​the pressure plate 92 covers all areas accessible to all spindle units 8 in the horizontal plane. After the spindle units 8 are adjusted into position, the control system commands the second lifting drive mechanism 91 to operate, driving the pressure plate 92 to descend until its bottom surface presses against the top end faces of all spindle units 8, and maintains this clamping state until processing is completed. Multi-spindle asynchronous cutting is prone to vibration. The top pressure plate 92 transforms the original cantilevered multi-stage kinematic chain into a simply supported beam with both ends, greatly enhancing the overall rigidity. This allows for the use of higher cutting parameters, resulting in better surface finish and protecting the precision spindle bearings. It also prevents the spindle unit 8 from lifting or vibrating under cutting reaction force, ensuring machining depth accuracy and equipment operation safety. Furthermore, it innovatively integrates stabilization functions that previously required external separate fixtures into the main unit structure, automating operation and improving user experience.

[0052] Preferably, the top end faces of the multiple spindle units 8 extend downward at an angle away from the lifting platform 4; the bottom of the pressure plate 92 is provided with an inclined pressing surface 921, the inclination angle of which is consistent with the inclination angle of the top end face of the spindle unit 8. The top end face of the spindle unit 8 and the pressing surface 921 of the pressure plate 92 are both machined into mutually matching inclined planes. When the pressure plate 92 presses down, the two inclined surfaces fit tightly together. The inclined surface fit has a guiding function, which can slightly correct the position of the spindle unit 8, so that the pressure is uniformly transmitted through the normal direction of the inclined surface, avoiding the generation of harmful lateral forces, and ensuring that the pressing force is pure and effective; the wedge effect is used to enhance the locking effect. When the horizontal cutting force attempts to lift the spindle unit 8, it will be converted into a normal force that makes the inclined surface press tighter, generating a self-locking effect, and the anti-loosening ability is much stronger than that of planar contact.

[0053] Preferably, two second lifting drive mechanisms 91 are provided, and the two second lifting drive mechanisms 91 are distributed at intervals along the movement direction of the plurality of main spindle units 8; the output parts of both second lifting drive mechanisms 91 are hinged to the top of the pressure plate 92. The output ends of the two second lifting drive mechanisms 91 are connected to the pressure plate 92 by hinges (such as ball joints), rather than being rigidly fixed. Even if there are slight asynchronies or non-parallelisms between the two second lifting drive mechanisms 91 during manufacturing, installation, or movement, the hinged structure allows the pressure plate 92 to undergo slight free deflection, ensuring that its bottom surface can completely fit the top surface of all main spindle units 8, eliminating damage to the mechanism or uneven clamping caused by "tightening"; the installation parallelism requirement of the two second lifting drive mechanisms 91 is greatly reduced, improving the reliability and yield of the product.

[0054] The second lifting drive mechanism 91 preferably adopts a rigid transmission method, such as a lead screw and nut pair, gear rack and pinion, or linear cylinder, to avoid the problem of insufficient rigidity caused by flexible transmission methods such as wire rope. Specifically, two linear cylinders or hydraulic cylinders can be symmetrically installed on the machine body 1. The piston rod ends are connected to the top of the pressure plate 92 through ball joints. The inlet and outlet of gas or oil are controlled by a solenoid valve to drive the piston rod to extend and retract, thereby realizing the rapid lifting and pressing of the pressure plate 92. The dual-cylinder structure is low in cost, simple in structure, fast in action, easy to maintain, and has a common air source in factories. It is easy to integrate and is particularly suitable for the auxiliary process of pressing, which does not require high absolute positional accuracy but requires rapid action and constant pressing force. Alternatively, two electric push rods integrating motors and lead screws can be used. The extension rod ends of the push rods are hinged to the pressure plate 92. The control system controls the forward and reverse rotation of the motor through a relay or IO module to realize the lifting and lowering of the pressure plate 92. The dual electric push rods are simple to control, do not require an air source or hydraulic source, have better position controllability than cylinders, and have self-locking properties, but the cost is higher and the pushing speed is slower.

[0055] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A CNC milling machine with multi-hole synchronous machining function, characterized in that, include: Machine body (1); workpiece mounting table (2), the workpiece mounting table (2) is mounted on the machine body (1); first lifting drive mechanism (3), the first lifting drive mechanism (3) is mounted on the machine body (1); lifting platform (4), the output of the first lifting drive mechanism (3) is driven and connected to the lifting platform (4); the lifting platform (4) is equipped with a first horizontal drive mechanism (5); at least two adjustable distance platforms (6), the output of the first horizontal drive mechanism (5) is driven and connected to at least one of the adjustable distance platforms (6) so that the horizontal distance between the two adjustable distance platforms (6) is adjustable; the two adjustable distance platforms (6) Each of the two adjustable tables (6) is equipped with at least one second horizontal drive mechanism (7), and each adjustable table (6) is equipped with at least two spindle units (8). The output of the second horizontal drive mechanism (7) is driven to connect to at least one of the two spindle units (8) located on the same adjustable table (6), so that the horizontal distance between the two spindle units (8) located on the same adjustable table (6) is adjustable. The spindle unit (8) is used for drilling and milling workpieces. The control system is electrically connected to the first lifting drive mechanism (3), the first horizontal drive mechanism (5) and the second horizontal drive mechanism (7) respectively.

2. A CNC milling machine with multi-hole synchronous machining function according to claim 1, characterized in that, The first horizontal drive mechanism (5) includes a first threaded rod (51), a first guide rod (52), and a first rotary drive motor (53); the first rotary drive motor (53) is mounted on the lifting platform (4), and the first threaded rod (51) and the first guide rod (52) are arranged in parallel; at least one of the adjusting platforms (6) is provided with a first threaded through hole (61) and a first guide through hole (62), the first threaded rod (51) is threadedly engaged with the first threaded through hole (61), and the first guide rod (52) is adapted to the first guide through hole (62); the output end of the first rotary drive motor (53) is driven and connected to the first threaded rod (51), and the first rotary drive motor (53) is electrically connected to the control system.

3. A CNC milling machine with multi-hole synchronous machining function according to claim 2, characterized in that, Both of the adjustment platforms (6) are provided with the first threaded through hole (61) and the first guide through hole (62); the first threaded rod (51) has two threads with opposite directions at both ends, and the two threads respectively engage with the first threaded through hole (61) on one of the adjustment platforms (6).

4. A CNC milling machine with multi-hole synchronous machining function according to claim 1, characterized in that, The second horizontal drive mechanism (7) includes a second threaded rod (71), a second guide rod (72), and a second rotary drive motor (73); the second rotary drive motor (73) is mounted on the adjusting table (6), and the second threaded rod (71) and the second guide rod (72) are arranged in parallel; at least one spindle unit (8) on the same adjusting table (6) is provided with a second threaded through hole (81) and a second guide through hole (82), the second threaded rod (71) is threadedly engaged with the second threaded through hole (81), and the second guide rod (72) is adapted to the second guide through hole (82); the output end of the second rotary drive motor (73) is driven and connected to the second threaded rod (71), and the second rotary drive motor (73) is electrically connected to the control system.

5. A CNC milling machine with multi-hole synchronous machining function according to claim 4, characterized in that, The two spindle units (8) located on the same adjustment platform (6) are provided with the second threaded through hole (81) and the second guide through hole (82); the two ends of the second threaded rod (71) have two threads with opposite directions of rotation, and the two threads respectively engage with the second threaded through hole (81) on one of the two spindle units (8) located on the same adjustment platform (6).

6. A CNC milling machine with multi-hole synchronous machining function according to claim 5, characterized in that, The second horizontal drive mechanism (7) on the two adjustment stages (6) is staggered in the vertical direction; the multiple spindle units (8) are located on the same horizontal line.

7. A CNC milling machine with multi-hole synchronous machining function according to claim 1, characterized in that, The first lifting drive mechanism (3) includes a third threaded rod (31), a third guide rod (32), and a third rotary drive motor (33); the third rotary drive motor (33) is mounted on the body (1), and the third threaded rod (31) and the third guide rod (32) are arranged in parallel; the lifting platform (4) is provided with a third threaded through hole (41) and a third guide through hole (42), the third threaded rod (31) is threadedly engaged with the third threaded through hole (41), and the third guide rod (32) is adapted to the third guide through hole (42); the output end of the third rotary drive motor (33) is driven and connected to the third threaded rod (31), and the third rotary drive motor (33) is electrically connected to the control system.

8. A CNC milling machine with multi-hole synchronous machining function according to claim 1, characterized in that, The top of the body (1) is also provided with a pressing and limiting mechanism (9), which includes a second lifting drive mechanism (91) and a pressure plate (92). The output of the second lifting drive mechanism (91) is connected to the pressure plate (92), and the second lifting drive mechanism (91) is electrically connected to the control system. The top end faces of the multiple spindle units (8) are flush. The horizontal projection area of ​​the pressure plate (92) covers all areas that the spindle units (8) can reach in the horizontal plane.

9. A CNC milling machine with multi-hole synchronous machining function according to claim 8, characterized in that, The top end faces of the multiple spindle units (8) extend downward at an angle away from the lifting platform (4); the bottom of the pressure plate (92) is provided with an inclined pressing surface (921), and the inclination angle of the pressing surface (921) is consistent with the inclination angle of the top end face of the spindle unit (8).

10. A CNC milling machine with multi-hole synchronous machining function according to claim 8, characterized in that, There are two second lifting drive mechanisms (91), and the two second lifting drive mechanisms (91) are distributed at intervals along the moving direction of the plurality of main shaft units (8); the output part of the two second lifting drive mechanisms (91) is hinged to the top of the pressure plate (92).

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