Integrated high-rigidity CNC lathe

Abstract

This utility model provides an integrated high-rigidity CNC lathe, belonging to the field of machine tool technology. It solves the technical problems of vibration and decreased accuracy in existing machine tool processing. This CNC lathe includes a bed frame, on which an electric spindle is fixedly mounted. The bed frame includes a bed body, the upper surface of which is horizontal. Parallel first and second fixing blocks protrude upwards from the upper surface of the bed body. The upper surfaces of the first and second fixing blocks are parallel to the upper surface of the bed body, with the upper surface of the first fixing block higher than that of the second fixing block. A first Z-axis slide rail is fixedly connected to the upper surface of the first fixing block, and a second Z-axis slide rail is fixedly connected to the upper surface of the second fixing block. A support frame is slidably connected to the first and second Z-axis slide rails, and an X-axis linear guide is fixedly connected to the support frame. A tool holder assembly is slidably connected to the X-axis linear guide. This utility model improves the rigidity of the machine tool and enhances processing accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool technology, specifically referring to an integrated high-rigidity CNC lathe. Background Technology

[0002] Automotive parts often have complex structures such as chamfers, rounding, threads, and thread relief grooves. CNC lathes can process these diverse and complex automotive parts in a single setup.

[0003] Existing CNC lathes use a combination of a flat bed and a triangular slide, with the Z-axis guide rail installed horizontally. However, the flat bed has a small support area, and when the horizontally installed Z-axis guide rail is subjected to the gravity and cutting force in the X direction of the triangular slide, it will cause uneven stress on the Z-axis guide rail, resulting in deformation and affecting machining accuracy.

[0004] To increase the support area of ​​the machine bed, existing technologies typically employ slant beds. The Z-axis guide rail is vertically mounted on the inclined surface of the slant bed, which is inclined at 30° or 45°. Therefore, the direction of gravity on the Z-axis guide rail is not perpendicular to the inclination direction of the inclined surface of the slant bed. The rollers on one side of the slider that slides between the Z-axis guide rail and the slant bed will bear additional loads for a long time, leading to accelerated local wear. After the rollers wear, the clearance between the guide rail and the slider increases, indirectly weakening the rigidity of the machine tool and causing machining vibration and a decrease in accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an integrated high-rigidity CNC lathe. The technical problem this invention aims to solve is how to better enhance the rigidity of the machine tool, reduce machining vibration, and improve machining accuracy.

[0006] The objective of this utility model can be achieved through the following technical solution: an integrated high-rigidity CNC lathe, including a bed frame integrally formed, an electric spindle fixedly mounted on the bed frame, the bed frame including a bed body, the upper end surface of the bed body being a horizontal plane, a first fixing block and a second fixing block protruding upwards from the upper end surface of the bed body, the upper end surfaces of the first fixing block and the second fixing block being parallel to the upper end surface of the bed body, the upper end surface of the first fixing block being higher than the upper end surface of the second fixing block, a first Z-axis slide rail fixedly connected to the upper end surface of the first fixing block, a second Z-axis slide rail fixedly connected to the upper end surface of the second fixing block, a tray frame slidably connected to the first Z-axis slide rail and the second Z-axis slide rail, an X-axis linear guide fixedly connected to the tray frame, and a tool holder assembly slidably connected to the X-axis linear guide rail. The gravity direction of the tool holder assembly is always vertically downwards, completely perpendicular to the contact surface of the horizontally mounted Z-axis slide rail, so that the rollers inside the slide block evenly bear the gravity load, avoiding unilateral overload. The Z-axis cutting force is mainly transmitted along the Z-axis rail. When the X-axis cutting force is transmitted to the Z-axis rail through the horizontal mounting part, its component direction is also relatively perpendicular to the Z-axis rail contact surface, resulting in more uniform force distribution. This uniform force distribution significantly reduces the risk of localized abnormal wear of the slide rollers, effectively maintaining the original preload and fit accuracy of the first and second Z-axis slide rail pairs. Therefore, wear is effectively controlled, and the high rigidity of the slide rail pairs is maintained for a long time, avoiding gradual rigidity decay caused by wear. The upper end face of the bed body has protruding, parallel first and second fixing blocks, which is equivalent to constructing two high-rigidity stepped platforms on the bed to install the first and second Z-axis slide rails. The support frame supported by the first and second Z-axis slide rails has a larger support area, increasing the X-axis movement distance of the tool holder assembly.

[0007] Furthermore, the lower end of the tray frame has a first horizontal mounting portion and a second horizontal mounting portion. The lower end faces of the first and second horizontal mounting portions are parallel to the upper end face of the bed body. The first horizontal mounting portion is higher than the second horizontal mounting portion. An inclined connecting portion connects the first and second horizontal mounting portions, and the lower and upper end faces of the inclined connecting portion are inclined relative to the upper end face of the bed body. This tray frame improves bending and torsional stiffness.

[0008] Furthermore, the upper end face of the inclined connecting part is at an angle of 30° to 45° to the upper end face of the bed body.

[0009] Furthermore, a first mounting groove is provided between the first fixing block and the second fixing block, and a first mounting block protrudes upward from the first mounting groove. A Z-axis fixing seat is fixedly connected to the first mounting block, and a Z-axis lead screw is slidably connected to the Z-axis fixing seat. One end of the Z-axis lead screw is connected to a drive motor. A first Z-axis slider and a second Z-axis slider are slidably connected to the first Z-axis slide rail and the second Z-axis slide rail, respectively. The first Z-axis slider and the second Z-axis slider are fixedly connected to the first horizontal mounting part and the second horizontal mounting part, respectively.

[0010] Furthermore, the upper end of the inclined connecting part has two symmetrical third fixing blocks protruding upwards, and the upper end of the third fixing blocks forms an angle of 30° to 45° with the upper end of the bed body.

[0011] Furthermore, the X-axis linear guide is fixed on the third fixing block, and a second mounting groove is provided between the two third fixing blocks. An X-axis slider is slidably connected to the X-axis linear guide. The tool holder assembly includes a tool holder support plate and a tool disc. The tool holder support plate is fixedly connected to the X-axis slider below. An X-axis fixing seat is fixedly installed in the second mounting groove, and an X-axis lead screw is slidably connected to the X-axis fixing seat by an internal thread.

[0012] Compared with existing technologies, the technical effects of this utility model are as follows: First, by using a stepped horizontal double Z-axis slide rail and an integral rigid frame structure of the machine body, the uneven force distribution on the Z-axis slider on the Z-axis slide rail eliminates the off-center wear phenomenon caused by uneven force distribution, ensuring long-term high rigidity of the Z-axis slide rail. The protruding first and second fixed blocks significantly increase the support area and local rigidity of the slide rail. Second, by constructing a high-rigidity pallet frame and an inclined X-axis mounting platform, the force flow path is optimized and the lever arm is shortened. These measures complement each other, significantly improving the static and dynamic rigidity of the entire machine. The increased rigidity directly leads to reduced deformation and effective vibration suppression during processing, ultimately achieving higher precision, better surface quality, and more stable long-term processing performance. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention.

[0014] Figure 2 This is a perspective view of the bed body and electric spindle of this utility model.

[0015] Figure 3 This is a three-dimensional drawing of the pallet holder and knife holder of this utility model.

[0016] Figure 4 This is a perspective view of the tray frame of this utility model.

[0017] Figure 5 This is a side view of the present invention.

[0018] Drawing number markings: 1. Bed frame; 101. Bed body; 102. First fixing block; 103. Second fixing block; 104. First mounting slot; 105. First mounting block; 2. Electric spindle; 3. First Z-axis slide rail; 4. Second Z-axis slide rail; 5. Tray frame; 501. First horizontal mounting part; 502. Second horizontal mounting part; 503. Inclined connecting part; 504. Third fixing block; 505. Second mounting slot; 6. X-axis axis rail; 7. Tool holder assembly; 701. Tool holder support plate; 702. Tool disc; 8. Z-axis fixing seat; 9. Z-axis lead screw; 10. Drive motor; 11. First Z-axis slider; 12. Second Z-axis slider; 13. X-axis slider; 14. X-axis fixing seat; 15. X-axis motor; 16. X-axis lead screw. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] according to Figures 1 to 5As shown, the integrated high-rigidity CNC lathe includes a bed frame 1, which is integrally formed and has an interlocking hollow pattern inside. An electric spindle 2 is fixedly mounted on the bed frame 1. The bed frame 1 includes a bed body 101, which is square in shape. The upper surface of the bed body 101 is horizontal. A first fixing block 102 and a second fixing block 103 are parallel to each other and protrude upward from the upper surface of the bed body 101. The upper surfaces of the first fixing block 102 and the second fixing block 103 are parallel to the upper surface of the bed body 101. The upper surface of the first fixing block 102 is higher than the upper surface of the second fixing block 103. A first Z-axis slide rail 3 is fixedly connected to the upper surface of the first fixing block 102. A second Z-axis slide rail 4 is fixedly connected to the upper surface of the second fixing block 103. A tray frame 5 is slidably connected to the first Z-axis slide rail 3 and the second Z-axis slide rail 4. An X-axis axis rail 6 is fixedly connected to the tray frame 5. A tool holder assembly 7 is slidably connected to the X-axis axis rail 6. The lower end of the tray frame 5 has a first horizontal mounting portion 501 and a second horizontal mounting portion 502. The lower end surfaces of the first horizontal mounting portion 501 and the second horizontal mounting portion 502 are parallel to the upper end surface of the bed body 101. The first horizontal mounting portion 501 is higher than the second horizontal mounting portion 502. An inclined connecting portion 503 connects the first horizontal mounting portion 501 and the second horizontal mounting portion 502. The lower end surface and the upper end surface of the inclined connecting portion 503 are inclined relative to the upper end surface of the bed body 101. The angle between the upper end surface of the inclined connecting portion 503 and the upper end surface of the bed body 101 is 30° to 45°. A first mounting groove 104 is provided between the first fixing block 102 and the second fixing block 103. A first mounting block 105 protrudes upward from the first mounting groove 104. A Z-axis fixing seat 8 is fixedly connected to the first mounting block 105. A Z-axis lead screw 9 is slidably connected to the Z-axis fixing seat 8 via an internal thread. A drive motor 10 is connected to one end of the Z-axis lead screw 9. A first Z-axis slider 11 and a second Z-axis slider 12 are slidably connected to the first Z-axis slide rail 3 and the second Z-axis slide rail 4, respectively. The first Z-axis slider 11 and the second Z-axis slider 12 are fixedly connected to the first horizontal mounting part 501 and the second horizontal mounting part 502, respectively. The drive motor 10 drives the Z-axis lead screw 9 to rotate, causing the pallet frame 5 to move along the Z-axis direction. The gravity direction of the tool holder assembly 7 is always vertically downward and completely perpendicular to the contact surface of the horizontally mounted Z-axis slide rail, so that the rollers inside the Z-axis slider evenly bear the gravity load and avoid unilateral overload. The Z-axis cutting force is mainly transmitted along the Z-axis rail direction. When the X-axis cutting force is transmitted to the Z-axis rail through the horizontal mounting part, its component direction is also relatively perpendicular to the Z-axis rail contact surface, resulting in more uniform force distribution. This uniform force distribution significantly reduces the risk of localized abnormal wear on the Z-axis slider rollers, effectively maintaining the original preload and fit accuracy of the first Z-axis slide rail 3 and the second Z-axis slide rail 4 pair. Therefore, wear is effectively controlled, the high rigidity of the slide rail pair is maintained for a long time, and gradual rigidity decay due to wear is avoided.The upper end face of the bed body 101 has a first fixing block 102 and a second fixing block 103 protruding and arranged in parallel. This is equivalent to building two high-rigidity stepped platforms on the bed to install the first Z-axis slide rail 3 and the second Z-axis slide rail 4. The tray frame 5 supported by the first Z-axis slide rail 3 and the second Z-axis slide rail 4 has a larger support area, which increases the movement distance of the tool holder assembly 7 in the X direction.

[0021] The upper end of the inclined connecting part 503 of the tray frame 5 has two symmetrical third fixing blocks 504 protruding upwards. The angle between the upper end surface of the third fixing block 504 and the upper end surface of the bed body 101 is 30° to 45°. The X-axis rail 6 is fixed on the third fixing block 504. A second mounting groove 505 is provided between the two third fixing blocks 504. An X-axis slider 13 is slidably connected to the X-axis rail 6. The tool holder assembly 7 includes a tool holder support plate 701 and a tool disc 702. The lower part of the tool holder support plate 701 is fixedly connected to the X-axis slider 13. An X-axis fixing seat 14 is fixedly installed in the second mounting groove 505. An X-axis lead screw 16 is slidably connected to the X-axis fixing seat 14 by an internal thread. The X-axis lead screw 16 is driven by the X-axis motor 15 to move the tool holder assembly 7 in the X direction.

[0022] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. An integrated high-rigidity CNC lathe, comprising a bed frame (1), wherein an electric spindle (2) is fixedly mounted on the bed frame (1), characterized in that: The bed frame (1) includes a bed body (101), the upper surface of which is a horizontal plane. The upper surface of the bed body (101) has a first fixing block (102) and a second fixing block (103) arranged in parallel protruding upwards. The upper surfaces of the first fixing block (102) and the second fixing block (103) are parallel to the upper surface of the bed body (101). The upper surface of the first fixing block (102) is higher than the upper surface of the second fixing block (103). The upper surface of the first fixing block (102) is fixedly connected to a first Z-axis slide rail (3). The upper surface of the second fixing block (103) is fixedly connected to a second Z-axis slide rail (4). A tray frame (5) is slidably connected to the first Z-axis slide rail (3) and the second Z-axis slide rail (4). An X-axis rail (6) is fixedly connected to the tray frame (5). A tool holder assembly (7) is slidably connected to the X-axis rail (6).

2. The integrated high-rigidity CNC lathe according to claim 1, characterized in that: The lower end of the tray frame (5) has a first horizontal mounting part (501) and a second horizontal mounting part (502). The lower end surfaces of the first horizontal mounting part (501) and the second horizontal mounting part (502) are parallel to the upper end surface of the bed body (101). The first horizontal mounting part (501) is higher than the second horizontal mounting part (502). An inclined connecting part (503) connects the first horizontal mounting part (501) and the second horizontal mounting part (502). The lower end surface and the upper end surface of the inclined connecting part (503) are inclined relative to the upper end surface of the bed body (101).

3. The integrated high-rigidity CNC lathe according to claim 2, characterized in that: The upper end face of the inclined connecting part (503) is at an angle of 30° to 45° to the upper end face of the bed body (101).

4. The integrated high-rigidity CNC lathe according to claim 2 or 3, characterized in that: A first mounting groove (104) is provided between the first fixing block (102) and the second fixing block (103). A first mounting block (105) protrudes upward from the first mounting groove (104). A Z-axis fixing seat (8) is fixedly connected to the first mounting block (105). A Z-axis lead screw (9) is slidably connected to the Z-axis fixing seat (8) by an internal thread. A drive motor (10) is connected to one end of the Z-axis lead screw (9). A first Z-axis slider (11) and a second Z-axis slider (12) are slidably connected to the first Z-axis slide rail (3) and the second Z-axis slide rail (4), respectively. The first Z-axis slider (11) and the second Z-axis slider (12) are fixedly connected to the first horizontal mounting part (501) and the second horizontal mounting part (502), respectively.

5. The integrated high-rigidity CNC lathe according to claim 4, characterized in that: The upper end of the inclined connecting part (503) has two symmetrical third fixing blocks (504) protruding upwards, and the upper end of the third fixing block (504) is at an angle of 30° to 45° with the upper end of the bed body (101).

6. The integrated high-rigidity CNC lathe according to claim 5, characterized in that: The X-axis linear guide (6) is fixed on the third fixing block (504), and a second mounting groove (505) is provided between the two third fixing blocks (504). An X-axis slider (13) is slidably connected on the X-axis linear guide (6). The tool holder assembly (7) includes a tool holder support plate (701) and a tool disc (702). The tool holder support plate (701) is fixedly connected to the X-axis slider (13) below. An X-axis fixing seat (14) is fixedly installed in the second mounting groove (505), and an X-axis lead screw (16) is slidably connected to the X-axis fixing seat (14) by a thread.

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