A rigid optimization structure of a double-spindle double-tool turret numerical control lathe

Abstract

The utility model discloses a rigid optimization structure of double main shaft double tool tower numerical control lathe, including the body, be provided with first mount pad and second mount pad on the body, and the first mount pad is fixedly installed with positive main shaft and lower tool tower, and two second mount pads all are installed with Z axle guide rail, and Z axle guide rail still has the sliding connection with Z axle saddle, and X axle guide rail is installed on Z axle saddle, and X axle saddle is slidably connected on X axle guide rail, and two X axle saddles are installed with auxiliary main shaft and upper tool tower respectively. The utility model arranges the Z axle guide rail of longer stroke below X axle guide rail, and is closely combined with the multiple surfaces of second mount pad, thereby guaranteeing the rigidity of Z axle guide rail while not being limited by the length of stroke, and the X axle guide rail of shorter stroke is arranged above Z axle guide rail, and is closely combined with the multiple surfaces of Z axle saddle, both avoiding cantilever structure and ensuring the connecting rigidity of X axle guide rail.

Description

Technical Field

[0001] This utility model relates to the field of CNC lathe technology, specifically to a rigid optimization structure for a dual-spindle dual-turret CNC lathe. Background Technology

[0002] As a key piece of equipment in modern precision machining, the structural rigidity of CNC lathes directly affects machining accuracy, stability, and efficiency. Especially in complex lathes with twin spindles and twin turrets, achieving a high-rigidity layout within a limited space has always been a technical challenge. Currently, in common twin-spindle, twin-turret CNC lathes, the main spindle and sub-spindle are typically designed as moving structures. While this structure improves machining flexibility to some extent, the main spindle undertakes the majority of machining operations, and the moving structure limits its connection rigidity to the bed. This can easily lead to vibration and displacement, especially under high-speed, heavy-cutting conditions, affecting machining quality.

[0003] Furthermore, the sliding structure of the sub-spindle typically adopts a Z-axis movement and X-axis fixation. This structure requires precise adjustment of the concentricity of the primary and secondary spindles during installation, which not only has high installation requirements but also brings inconvenience to later maintenance and adjustment. To overcome this problem, existing technologies have gradually developed designs where the sub-spindle has bidirectional movement capabilities along both the Z and X axes. This structure has lower installation requirements, and the concentricity of the primary and secondary spindles can be controlled through system parameters. However, such bidirectional movement structures also introduce new rigidity defects. For example, the utility model patent with publication number CN219852140U uses a design where the sub-spindle has the Z-axis set on the X-axis, and both the Z-axis and X-axis guideways extend outwards, forming a distinct cantilever structure. This structure results in weak end rigidity of the Z-axis and X-axis, generating a large torque when subjected to radial cutting forces, which easily causes vibration and deformation, further limiting the machining accuracy and stability of the machine tool.

[0004] Meanwhile, the upper and lower turrets are usually designed as mobile structures. The lower turret is located near the front of the lathe, and its mobile structure occupies a large space, making it difficult for manual operation and maintenance at the front of the lathe. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a rigidly optimized structure for a dual-spindle, dual-turret CNC lathe, thereby solving the problems mentioned in the background art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A rigidity optimization structure for a dual-spindle dual-turret CNC lathe includes a bed, a first mounting seat is provided on the left side of the upper surface of the bed, and a main spindle and a lower turret are fixedly mounted on the first mounting seat. Two second mounting seats are provided on the right side of the upper surface of the bed, and both the first mounting seat and the second mounting seat are integrally formed with the bed.

[0008] Each of the two second mounting seats is equipped with a Z-axis guide rail, the Z-axis guide rail being shorter than the length of the second mounting seat, and the Z-axis guide rail being in close contact with at least two surfaces of the second mounting seat; a Z-axis saddle is also slidably connected to the Z-axis guide rail, and an X-axis guide rail is mounted on the Z-axis saddle, the X-axis guide rail being shorter than the length of the Z-axis saddle, and the X-axis guide rail being in close contact with at least two surfaces of the Z-axis saddle;

[0009] An X-axis saddle is slidably connected to the X-axis guide rail. A sub-spindle and an upper turret are respectively mounted on the two X-axis saddles. The length of the X-axis guide rail is smaller than that of the Z-axis guide rail, so that the sub-spindle is closer to the front end of the bed.

[0010] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, the upper surface of the second mounting base is configured as a first recessed platform structure, and the two sides of the upper surface of the first recessed platform structure are configured as second recessed platform structures. The Z-axis guide rail is installed in the second recessed platform structure and is in close contact with at least two of its surfaces. The upper end of the Z-axis guide rail protrudes from the second recessed platform structure and is slidably connected to a Z-axis slider. The Z-axis slider is fixedly connected to the bottom of the Z-axis saddle.

[0011] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, a Z-axis lead screw is movably installed within the first recessed structure, and a first nut seat is movably connected to the Z-axis lead screw. The bottom of the Z-axis saddle is configured as a first boss structure, with both sides of the first boss structure connected to the Z-axis slider. The first nut seat is fixedly installed in the middle of the first boss structure, and one end of the Z-axis lead screw is connected to a Z-axis servo motor via a coupling.

[0012] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, the upper surface of the Z-axis saddle is provided with stepped structures on both sides. The X-axis guide rail is installed on the stepped structure and is in close contact with at least two of its surfaces. The upper end of the X-axis guide rail protrudes from the stepped structure and is slidably connected to an X-axis slider. The X-axis slider is fixedly connected to the bottom of the X-axis saddle.

[0013] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, the upper surface of the Z-axis saddle is configured as a third concave platform structure, with the stepped structure located on both sides of the third concave platform structure. An X-axis lead screw is movably installed within the third concave platform structure, and a second nut seat is movably connected to the X-axis lead screw. The bottom of the X-axis saddle is configured as a second boss structure, with both sides of the second boss structure connected to the X-axis slider. The second nut seat is fixedly installed in the middle of the second boss structure. The rear end of the X-axis lead screw where the upper turret is located is connected to an X-axis servo motor via a coupling.

[0014] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, an X-axis servo motor is installed on one side of the Z-axis saddle where the secondary spindle is located. The X-axis servo motor and one end of the adjacent X-axis lead screw are both connected to synchronous pulleys, and the two synchronous pulleys are connected by a synchronous belt drive.

[0015] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, the upper surfaces of the first mounting base and the two second mounting bases are all inclined downwards at a certain angle.

[0016] As a preferred embodiment of the rigidity optimization structure of a dual-spindle dual-turret CNC lathe, the lower turret and the sub-spindle are located at the front end of the bed, and the main spindle and the upper turret are located at the rear end of the bed, with the main spindle and the sub-spindle, and the upper turret and the lower turret being arranged in an alternating manner.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The main spindle and lower turret of this invention adopt a fixed installation structure, which significantly enhances the connection rigidity between the main spindle and the machine bed. The main spindle, which undertakes the main machining process, can avoid vibration or displacement generated during the machining process as much as possible, ensuring machining quality. The fixed layout of the lower turret effectively saves space, making the area of ​​the main spindle on the same side more spacious, which is convenient for manual operation and maintenance.

[0019] Furthermore, this invention further optimizes the connection rigidity for the bidirectional movement function of the sub-spindle. Considering that shaft-type workpieces are typically long and small in diameter, and that the sub-spindle's Z-axis is associated with the machining length and the X-axis with the machining diameter, this invention arranges a longer-stroke Z-axis guide rail below the X-axis guide rail and tightly fits against multiple surfaces of the second mounting base. This ensures the rigidity of the Z-axis guide rail without being limited by the stroke length. Meanwhile, a shorter-stroke X-axis guide rail is arranged above the Z-axis guide rail and tightly fits against multiple surfaces of the Z-axis saddle. This avoids a cantilever structure while ensuring the connection rigidity of the X-axis guide rail. At the same time, due to the shorter stroke of the X-axis guide rail, the sub-spindle on the X-axis guide rail is closer to the front end of the bed, further improving the convenience of manual operation and maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the rigid optimization structure of the dual-spindle dual-turret CNC lathe described in this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the second mounting base and the X-axis guide rail described in this utility model.

[0023] Figure 3 This is a schematic diagram of the moving structure related to the secondary spindle described in this utility model.

[0024] Figure 4 This is a schematic diagram of the disassembled structure of the moving structure of the secondary spindle described in this utility model.

[0025] Figure 5 This is a schematic diagram of the structure of the Z-axis saddle and X-axis guide rail described in this utility model.

[0026] Figure 6 This is a schematic diagram of the X-axis saddle described in this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Bed; 101. First mounting base; 102. Second mounting base; 1021. First recessed platform structure; 1022. Second recessed platform structure; 2. Main spindle; 3. Sub-spindle; 4. Upper turret; 5. Lower turret; 6. Z-axis guide rail; 7. Z-axis saddle; 71. First boss structure; 72. Step structure; 73. Third recessed platform structure; 8. X-axis guide rail; 9. X-axis saddle; 91. Second boss structure; 10. Z-axis slider; 11. Z-axis lead screw; 12. First nut seat; 13. Z-axis servo motor; 14. X-axis slider; 15. X-axis lead screw; 16. Second nut seat; 17. X-axis servo motor; 18. Synchronous pulley. Detailed Implementation

[0029] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figure 1 As shown, this utility model provides a rigidity optimization structure for a dual-spindle dual-turret CNC lathe, including a bed 1. A first mounting base 101 is provided on the left side of the upper surface of the bed 1. The first mounting base 101 is equipped with a main spindle 2 and a lower turret 5. Since the main spindle 2 undertakes the main machining process in the CNC lathe, the main spindle 2 in this embodiment preferably adopts a fixed mounting structure. The fixed mounting structure can significantly enhance the connection rigidity between the main spindle 2 and the bed 1, thereby minimizing vibration or displacement generated during machining and ensuring machining quality. At the same time, since the CNC lathe may need to process workpieces of various specifications, the operator needs to load, unload and change the fixtures of the main spindle 2, and the main spindle 2 needs regular maintenance, such as replacing spindle bearings, cleaning chips, and checking guide rails and lead screws. Therefore, the lower turret 5 also preferably adopts a fixed mounting structure. Compared with the existing mobile structure, the fixed layout of the lower turret 5 in this embodiment can effectively save space, making the area of ​​the main spindle 2 on the same side more spacious, which is convenient for manual operation and maintenance.

[0034] Two second mounting seats 102 are provided on the right side of the upper surface of the bed 1. Both the first mounting seat 101 and the second mounting seat 102 are integrally formed with the bed 1, thereby ensuring the stability of the first mounting seat 101 and the second mounting seat 102. Z-axis guide rails 6 are mounted on both second mounting seats 102. The length of the Z-axis guide rail 6 is less than that of the second mounting seat 102, so that the entire Z-axis guide rail 6 is within the range of the second mounting seat 102, avoiding the formation of a cantilever structure. This ensures the connection rigidity of the end of the Z-axis guide rail 6, and the Z-axis guide rail 6 is kept in close contact with at least two surfaces of the second mounting seat 102. The Z-axis guide rail 6 is designed to fit snugly to minimize vibration or deformation during cutting, thereby enhancing its overall stability. A Z-axis saddle 7 is slidably connected to the Z-axis guide rail 6, and an X-axis guide rail 8 is mounted on the Z-axis saddle 7. The X-axis guide rail 8 is shorter than the Z-axis saddle 7, ensuring that the X-axis guide rail 8 is entirely within the range of the Z-axis saddle 7, avoiding a cantilever structure. This ensures the rigidity of the connection at the end of the X-axis guide rail 8, and the X-axis guide rail 8 is tightly fitted to at least two surfaces of the Z-axis saddle 7, further minimizing vibration or deformation during cutting and enhancing its overall stability.

[0035] An X-axis saddle 9 is slidably connected to the X-axis guide rail 8. A sub-spindle 3 and an upper turret 4 are respectively mounted on the two X-axis saddles 9. Since the dual-spindle dual-turret CNC lathe of this embodiment is mainly used for machining shaft-type workpieces, and the Z-axis guide rail 6 of the sub-spindle 3 is associated with the machining length of the workpiece, and the X-axis guide rail 8 is associated with the machining diameter of the workpiece, shaft-type workpieces are usually long and small in diameter. Therefore, in this embodiment, the X-axis guide rail 8 is set to be shorter than the length of the Z-axis guide rail 6, thereby shortening the X-axis travel of the sub-spindle 3, so that the sub-spindle 3 on the X-axis guide rail 8 is closer to the front end of the bed 1, further improving the convenience of manual operation and maintenance.

[0036] In this embodiment, the Z-axis guide rail 6 is arranged below the X-axis guide rail 8, and the Z-axis guide rail 6 is closely fitted with multiple surfaces of the second mounting base 102. This ensures the connection rigidity of the Z-axis guide rail 6 and is not limited by the length of the stroke. The Z-axis guide rail 6 can extend continuously within the installation range of the second mounting base 102, allowing the sub-spindle 3 to use a longer Z-axis stroke. At the same time, since the X-axis stroke required by the sub-spindle 3 is relatively short, the X-axis guide rail 8 is arranged above the Z-axis guide rail 6, so that the X-axis guide rail 8 does not protrude too much from the sides of the Z-axis guide rail 6, avoiding the formation of a cantilever structure, thereby ensuring the connection rigidity of the X-axis guide rail 8.

[0037] Specifically, the Z-axis guide rail 6 and the second mounting base 102 described in this embodiment can adopt the following connection structure:

[0038] like Figures 2 to 4As shown, the upper surface of the second mounting base 102 is configured as a first recessed platform structure 1021, and the two sides of the upper surface of the first recessed platform structure 1021 are configured as second recessed platform structures 1022. The Z-axis guide rail 6 is installed in the second recessed platform structure 1022 and is in close contact with at least two of its surfaces, which improves the stability of the Z-axis guide rail 6. The upper end of the Z-axis guide rail 6 protrudes from the second recessed platform structure 1022 and is slidably connected to a Z-axis slider 10. The Z-axis slider 10 is fixedly connected to the bottom of the Z-axis saddle 7, so that the Z-axis saddle 7 can slide on the Z-axis guide rail 6 through the Z-axis slider 10.

[0039] Meanwhile, a Z-axis lead screw 11 is movably installed inside the first recessed structure 1021, and a first nut seat 12 is movably connected to the Z-axis lead screw 11. The bottom of the Z-axis saddle 7 is set as a first boss structure 71, and the two sides of the first boss structure 71 are connected to the Z-axis slider 10. The first nut seat 12 is fixedly installed in the middle of the first boss structure 71. One end of the Z-axis lead screw 11 is connected to the Z-axis servo motor 13 through a coupling. When the Z-axis servo motor 13 is started, the Z-axis servo motor 13 will drive the Z-axis lead screw 11 to rotate. The first nut seat 12 on the Z-axis lead screw 11 converts the rotational power into linear motion, thereby driving the Z-axis saddle 7 and the components on the Z-axis saddle 7 to slide along the Z-axis guide rail 6.

[0040] Specifically, the X-axis guide rail 8 and the Z-axis saddle 7 described in this embodiment can adopt the following connection structure:

[0041] like Figure 5 and Figure 6 As shown, the upper surface of the Z-axis saddle 7 is provided with stepped structures 72 on both sides. The X-axis guide rail 8 is installed on the stepped structure 72 and is in close contact with at least two of its surfaces, which improves the stability of the X-axis guide rail 8. The upper end of the X-axis guide rail 8 protrudes from the stepped structure 72 and is slidably connected to the X-axis slider 14. The X-axis slider 14 is fixedly connected to the bottom of the X-axis saddle 9, so that the X-axis saddle 9 can slide on the X-axis guide rail 8 through the X-axis slider 14.

[0042] Meanwhile, the upper surface of the Z-axis saddle 7 is configured as a third concave platform structure 73, and the stepped structure 72 is located on both sides of the third concave platform structure 73. The X-axis lead screw 15 is movably installed in the third concave platform structure 73, and the second nut seat 16 is movably connected to the X-axis lead screw 15. The bottom of the X-axis saddle 9 is configured as a second boss structure 91, and the two sides of the second boss structure 91 are connected to the X-axis slider 14. The second nut seat 16 is fixedly installed in the middle of the second boss structure 91. The rear end of the X-axis lead screw 15 where the upper turret 4 is located is connected to the X-axis servo motor 17 through a coupling. When the X-axis servo motor 17 is started, the X-axis servo motor 17 will drive the X-axis lead screw 15 to rotate. The second nut seat 16 on the X-axis lead screw 15 will convert the rotational power into linear motion, thereby driving the X-axis saddle 9 and the components on the X-axis saddle 9 to slide along the X-axis guide rail 8.

[0043] To further optimize the space occupied by the moving structure of the secondary spindle 3, in this embodiment, another X-axis servo motor 17 is installed on one side of the Z-axis saddle 7 where the secondary spindle 3 is located. One end of the X-axis servo motor 17 and the adjacent X-axis lead screw 15 are connected to a synchronous pulley 18. The two synchronous pulleys 18 are connected by a synchronous belt drive. In this embodiment, the connection method of driving the X-axis lead screw 15 through the transmission component minimizes the distance between the secondary spindle 3 and the front end of the bed 1, making the overall structure more compact and improving the convenience of manual operation and maintenance.

[0044] Preferably, since the CNC lathe generates chips during the cutting process, in order to prevent the chips from accumulating around the main spindle 2 or the secondary spindle 3, the upper surfaces of the first mounting base 101 and the two second mounting bases 102 in this embodiment are preferably inclined downward at 30°, so that the chips will be discharged along the inclined surface during the cutting process.

[0045] More preferably, to prevent interference between the upper turret 4 and the lower turret 5, in this embodiment, the lower turret 5 and the sub-spindle 3 are arranged at the front end of the bed 1, while the main spindle 2 and the upper turret 4 are arranged at the rear end of the bed 1, so that the main spindle 2 and the sub-spindle 3, and the upper turret 4 and the lower turret 5 are staggered, so that the upper turret 4 and the lower turret 5 will not interfere with each other during operation.

[0046] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A rigidity-optimized structure for a dual-spindle, dual-turret CNC lathe, characterized in that, The bed (1) is provided with a first mounting seat (101) on the left side of the upper surface of the bed (1). The main spindle (2) and the lower turret (5) are fixedly mounted on the first mounting seat (101). Two second mounting seats (102) are provided on the right side of the upper surface of the bed (1). The first mounting seat (101) and the second mounting seat (102) are integrally formed with the bed (1). Each of the two second mounting bases (102) is equipped with a Z-axis guide rail (6). The Z-axis guide rail (6) is shorter than the length of the second mounting base (102), and the Z-axis guide rail (6) is in close contact with at least two surfaces of the second mounting base (102). A Z-axis saddle (7) is also slidably connected to the Z-axis guide rail (6). An X-axis guide rail (8) is mounted on the Z-axis saddle (7). The X-axis guide rail (8) is shorter than the length of the Z-axis saddle (7), and the X-axis guide rail (8) is in close contact with at least two surfaces of the Z-axis saddle (7). X-axis saddles (9) are slidably connected to the X-axis guide rail (8). A secondary spindle (3) and an upper turret (4) are respectively installed on the two X-axis saddles (9). The length of the X-axis guide rail (8) is smaller than that of the Z-axis guide rail (6), so that the secondary spindle (3) is closer to the front end of the bed (1).

2. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 1, characterized in that, The upper surface of the second mounting base (102) is configured as a first recessed platform structure (1021), and the two sides of the upper surface of the first recessed platform structure (1021) are configured as second recessed platform structures (1022). The Z-axis guide rail (6) is installed in the second recessed platform structure (1022) and is in close contact with at least two of its surfaces. The upper end of the Z-axis guide rail (6) protrudes from the second recessed platform structure (1022) and is slidably connected to a Z-axis slider (10). The Z-axis slider (10) is fixedly connected to the bottom of the Z-axis saddle (7).

3. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 2, characterized in that, A Z-axis lead screw (11) is movably installed inside the first recessed structure (1021). A first nut seat (12) is movably connected to the Z-axis lead screw (11). The bottom of the Z-axis saddle (7) is configured as a first boss structure (71). The two sides of the first boss structure (71) are connected to the Z-axis slider (10). The first nut seat (12) is fixedly installed in the middle of the first boss structure (71). One end of the Z-axis lead screw (11) is connected to a Z-axis servo motor (13) through a coupling.

4. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 1, characterized in that, The upper surface of the Z-axis saddle (7) is provided with stepped structures (72) on both sides. The X-axis guide rail (8) is installed on the stepped structure (72) and is in close contact with at least two of its surfaces. The upper end of the X-axis guide rail (8) protrudes from the stepped structure (72) and is slidably connected to an X-axis slider (14). The X-axis slider (14) is fixedly connected to the bottom of the X-axis saddle (9).

5. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 4, characterized in that, The upper surface of the Z-axis saddle (7) is configured as a third concave platform structure (73), and the stepped structure (72) is located on both sides of the third concave platform structure (73). An X-axis lead screw (15) is movably installed in the third concave platform structure (73), and a second nut seat (16) is movably connected to the X-axis lead screw (15). The bottom of the X-axis saddle (9) is configured as a second boss structure (91), and the two sides of the second boss structure (91) are connected to the X-axis slider (14). The second nut seat (16) is fixedly installed in the middle of the second boss structure (91). The rear end of the X-axis lead screw (15) where the upper turret (4) is located is connected to an X-axis servo motor (17) through a coupling.

6. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 5, characterized in that, An X-axis servo motor (17) is installed on one side of the Z-axis saddle (7) where the secondary spindle (3) is located. One end of the X-axis servo motor (17) and the adjacent X-axis lead screw (15) are connected to a synchronous pulley (18). The two synchronous pulleys (18) are connected by a synchronous belt drive.

7. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 1, characterized in that, The upper surfaces of the first mounting base (101) and the two second mounting bases (102) are all inclined downward at 30°.

8. The rigidity optimization structure of the dual-spindle dual-turret CNC lathe according to claim 1, characterized in that, The lower turret (5) and the sub-spindle (3) are located at the front end of the bed (1), and the main spindle (2) and the upper turret (4) are located at the rear end of the bed (1). The main spindle (2) and the sub-spindle (3), and the upper turret (4) and the lower turret (5) are arranged in an alternating manner.

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