A center drive type main shaft double-face vertical cutting machining numerical control machine tool

Abstract

The utility model belongs to lathe technical field, specifically discloses a middle drive type main shaft double -sided vertical cutting processing numerical control lathe. The column of machine tool is fixed on the upper portion of rear side of base, the middle drive main shaft is fixed in the upper portion of front side of base middle position, is equipped with two sets of bed saddle slide respectively in the both sides of middle drive main shaft of column front side, bed saddle slide can move along the guide rail I of horizontal setting of column, T type groove board can be perpendicularly slid in bed saddle slide, is equipped with the row of tool holder of clamping tool on T type groove board. The utility model sets up middle drive main shaft in the upper portion of front side of base middle position, and sets up the column fixedly in the upper portion of rear side of base, and sets up two sets of bed saddle slide and T type groove board, the row of tool holder respectively on the column of both sides of middle drive main shaft, thereby not only can realize part double -sided simultaneous processing in one time clamping, has improved the processing efficiency effectively, but also can avoid the influence of turning over clamping error on machining accuracy, and the layout is compact, is easy to maintain and is maintained and is smooth in chip removal.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, specifically to a CNC machine tool with a centrally driven spindle and double-sided vertical cutting, which features a compact layout, low cost, high processing efficiency and precision, easy maintenance, and smooth chip removal. Background Technology

[0002] When machining certain complex parts or parts with high precision requirements on both sides, traditional single-sided CNC lathes require multiple clamping and adjustment of the workpiece position. For example, when machining symmetrical parts, one end must be machined first, and then the other end must be turned around to machine. Not only does this result in a high proportion of auxiliary time for clamping and tool setting, leading to low machining efficiency, but it also makes it easy for errors from repeated clamping to affect the final machining accuracy.

[0003] In existing technologies, although some double-sided machining centers employ independent drive structures with dual spindles / dual power heads, allowing for simultaneous double-sided machining of parts in a single clamping setup, they also suffer from drawbacks such as large machine size, high cost, long transmission chains, and susceptibility to vibration and energy loss. Additionally, there are flip-type double-sided machining centers that use rotary motors or mechanical devices to rotate the fixture, enabling alternating machining of the workpiece's front and back sides. While these can achieve sequential machining of both sides in a single clamping setup, avoiding errors caused by repeated clamping during flipping and shortening auxiliary time, and are simple in structure, low in cost, and have shorter transmission chains, their machining efficiency is low due to the need for sequential machining of both sides. Furthermore, positioning accuracy is significantly affected by mechanical transmission, and the flipping process can cause vibration, making it difficult to effectively improve machining accuracy. Moreover, there are multi-axis linkage and composite machining equipment that combine five-axis linkage technology to achieve double-sided machining of complex curved surfaces, allowing multi-sided milling to be completed in a single clamping setup, avoiding errors caused by repeated clamping and positioning. However, such equipment is difficult to program and expensive, therefore it is only suitable for machining high-precision, complex parts.

[0004] Therefore, developing a double-sided machining tool with a compact layout, high processing efficiency, good precision, low cost, and easy maintenance has become one of the important directions in the research and development of current machining equipment. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a CNC machine tool with a centrally driven spindle and double-sided vertical cutting, which features a compact layout, low cost, high processing efficiency and precision, easy maintenance, and smooth chip removal.

[0006] The present invention relates to a CNC machine tool for double-sided vertical cutting with a central drive spindle, comprising a base, a column, a central drive spindle, a saddle slide, a T-slot plate, a tool holder, and a control system. The column is fixedly mounted on the upper rear side of the base, and the central drive spindle is fixedly mounted on the upper front side of the base. Two sets of saddle slides are respectively mounted on both sides of the central drive spindle on the front side of the column. The saddle slides can move along the horizontally mounted guide rail I on the column. The T-slot plate is vertically slidable on the saddle slide, and a tool holder for clamping tools is mounted on the T-slot plate. The control system is electrically connected to the drive motors of the central drive spindle and the saddle slide. The bed saddle slide includes a servo motor I, a ball screw I, a slider, a bed saddle, a servo motor II, a ball screw II, a sliding pair, and a slide plate. The servo motor I is fixedly mounted at one end of the column away from the intermediate drive spindle. The ball screw I is rotatably mounted horizontally on the column. The slider is fixedly mounted at one end of the bed saddle near the column. The slider rolls with the guide rail I through built-in rollers. The nut I of the ball screw I is fixedly connected to the bed saddle. The servo motor II is fixedly mounted at the top or upper part of the bed saddle. The ball screw II is rotatably mounted vertically on the bed saddle. The nut II of the ball screw II is fixedly connected to the slide plate. The slide plate and the bed saddle are rolled together through a sliding pair.

[0007] Furthermore, the saddle slide also includes a connecting seat I and a coupling I. The connecting seat I is fixedly disposed at one end of the column away from the intermediate drive spindle. The servo motor I is fixedly disposed at one end of the connecting seat I away from the intermediate drive spindle. The end of the ball screw I away from the intermediate drive spindle is rotatably connected to the connecting seat I. The coupling I is rotatably disposed inside the connecting seat I and its two ends are respectively connected to the motor shaft of the servo motor I and the ball screw I.

[0008] Furthermore, the saddle is a vertically arranged rectangular structure, and the saddle slide plate also includes a connecting seat II and a coupling II. The connecting seat II is fixedly installed at the top of the saddle, the servo motor II is fixedly installed at the top of the connecting seat II, the top of the ball screw II is rotatably connected to the connecting seat II, and the coupling II is rotatably installed inside the connecting seat II with its two ends respectively connected to the motor shaft of the servo motor II and the top of the ball screw II.

[0009] Furthermore, a workpiece positioning and ejection mechanism is also fixedly installed on the T-slot plate of the saddle slide plate on one side of the intermediate drive spindle. The workpiece positioning and ejection mechanism includes a mounting base, a translation device, and a positioning ejection head. The mounting base is fixedly installed on the T-slot plate, the translation device is installed on the mounting base and the moving rod can move horizontally, and the positioning ejection head is fixedly installed on the moving rod of the translation device near one end of the intermediate drive spindle.

[0010] Furthermore, the translation device is a cylinder, a hydraulic cylinder, or a linear motor, and the end of the positioning ejector head away from the translation device is a plane, and the maximum outer circle diameter of the positioning ejector head is smaller than the diameter of the intermediate drive spindle clamping hole.

[0011] Furthermore, at least two tool holders are provided on one side of the T-slot plate of the intermediate drive spindle, and a tool holder and a workpiece positioning and ejection mechanism are respectively provided on the other side of the T-slot plate.

[0012] Furthermore, the end of the slide plate away from the saddle is provided with a connecting plane that connects to the T-slot plate. The connecting plane of the slide plate is provided with a plurality of connecting screw holes, and the T-slot plate is provided with a plurality of countersunk holes I corresponding to the connecting screw holes.

[0013] Furthermore, at least two T-slots are vertically arranged on the end face of the T-slot plate away from the slide plate, and at least two countersunk holes II corresponding to the T-slots are provided on the knife block.

[0014] Furthermore, chip collection boxes are respectively provided on both sides of the central drive spindle at the upper end of the base, and inclined chip discharge ports are also provided on both sides of the central drive spindle at the top of the base.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model consists of a base and a column forming a 90° vertical integral bed, and adopts a layout of a single central drive spindle + symmetrical vertical bed saddle slide. Not only is the overall structure compact, effectively reducing the machine tool's footprint, but compared with existing machine tools with dual spindle / dual power head designs, it also greatly reduces equipment costs and subsequent maintenance costs because it eliminates the need for two complex and expensive spindle drive systems.

[0016] 2. This utility model adopts a structure in which the workpiece is fixed by a centrally driven spindle and the cutting tools on both sides feed synchronously and vertically to achieve simultaneous cutting on both sides. Compared with traditional single-sided CNC lathes and double-sided machining tools with flip-type structures, it effectively improves machining efficiency. Moreover, the design of the servo motor and ball screw of the saddle slide not only has high feed accuracy, low frictional resistance, good rigidity, and high resistance to vibration and deformation, but also achieves high machining accuracy and rapid traverse speed, further shortening the machining auxiliary time and improving the overall machining efficiency.

[0017] 3. This utility model employs a fixed intermediate drive spindle and a saddle slide controlled by a closed-loop system of ball screw I / II and a servo motor, ensuring the stability and positioning accuracy of the tool during machining. Simultaneously, by setting a workpiece positioning and ejection mechanism on one side of the saddle slide, not only can the workpiece be accurately positioned, reducing clamping errors, but the machined workpiece can also be ejected promptly, and the workpiece to be machined can be pushed in, achieving automatic loading and unloading, effectively reducing clamping auxiliary time. Furthermore, compared to multi-axis linkage and composite machining equipment, although it is slightly less flexible, for machining conventional parts, it offers lower costs and simpler operation while ensuring accuracy.

[0018] 4. The machine tool of this utility model has a clear layout of each component and a relatively simple structure. For example, the components of the saddle slide, including the servo motor, ball screw, slider, and saddle, all adopt common mechanical structures, which are easy to disassemble and maintain. Moreover, the daily lubrication, inspection and replacement of parts of key components such as the intermediate drive spindle and saddle slide are more convenient, which reduces the difficulty and cost of maintenance and improves the availability and stability of the equipment.

[0019] 5. This utility model provides chip collection boxes on both sides of the central drive spindle at the top of the base, and an inclined chip discharge port at the top. This allows the chips generated during processing to quickly slide into the chip collection boxes under the action of gravity. This avoids the accumulation of chips in the processing area, which affects the processing accuracy and equipment operation. It also reduces the damage of chips to the cutting tools and workpieces, extends the service life of the cutting tools, and ensures the stable operation of the equipment, improving the continuity and reliability of processing.

[0020] In summary, this utility model perfectly solves the problem of the inability to achieve both "efficiency, accuracy, and cost" in the prior art through four major innovations: fixed rotation of the central drive spindle, independent vertical feed on both sides, modular T-shaped tool system, and directional chip removal structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the CNC machine tool for double-sided vertical cutting with a centrally driven spindle according to this utility model; Figure 2 for Figure 1 Top right view; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is an enlarged view of the bed saddle slide structure of this utility model; Figure 5 This is an enlarged view of the intermediate drive spindle structure of this utility model; In the diagram: 1-base, 11-chip removal port, 2-column, 21-guide rail I, 3-intermediate drive spindle, 4-saddle slide plate, 41-servo motor I, 42-ball screw I, 43-slider, 44-saddle, 45-servo motor II, 46-slide plate, 47-connecting seat I, 48-connecting seat II, 49-connecting screw hole, 5-T-slot plate, 51-countersunk hole I, 52-T-slot, 6-tool holder, 61-countersunk hole II, 7-workpiece positioning and ejection mechanism, 71-mounting seat, 72-translation device, 73-positioning ejector head, 8-chip collection box. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0023] like Figures 1 to 5 As shown, this utility model discloses a mid-drive spindle double-sided vertical cutting CNC machine tool, comprising a base 1, a column 2, a mid-drive spindle 3, a saddle slide 4, a T-slot plate 5, a tool holder 6, and a control system (not shown in the figure). The column 2 is fixedly installed on the upper rear side of the base 1, and the mid-drive spindle 3 is fixedly installed on the upper front side of the base 1. Two sets of saddle slides 4 are respectively installed on both sides of the mid-drive spindle 3 on the front side of the column 2. The saddle slides 4 can move along the horizontally installed guide rail I21 on the column 2. The T-slot plate 5 is vertically slidable on the saddle slide 4, and a tool holder 6 for clamping tools is provided on the T-slot plate 5. The control system is electrically connected to the drive motors of the mid-drive spindle 3 and the saddle slide 4. The saddle slide 4 includes... The system includes a servo motor I 41, a ball screw I 42, a slider 43, a saddle 44, a servo motor II 45, a ball screw II, a sliding pair, and a slide plate 46. The servo motor I 41 is fixedly mounted at one end of the column 2 away from the intermediate drive spindle 3. The ball screw I 42 is rotatably mounted horizontally on the column 2. The slider 43 is fixedly mounted at one end of the saddle 44 near the column 2 and rolls with the guide rail I 21 via built-in rollers. The nut I of the ball screw I 42 is fixedly connected to the saddle 44. The servo motor II 45 is fixedly mounted at the top or upper part of the saddle 44. The ball screw II is rotatably mounted vertically on the saddle 44 and the nut II of the ball screw II is fixedly connected to the slide plate 46. The slide plate 46 and the saddle 44 are rolled together via a sliding pair.

[0024] The saddle slide plate 4 also includes a connecting seat I 47 and a coupling I. The connecting seat I 47 is fixedly installed at one end of the column 2 away from the intermediate drive spindle 3. The servo motor I 41 is fixedly installed at one end of the connecting seat I 47 away from the intermediate drive spindle 3. The end of the ball screw I 42 away from the intermediate drive spindle 3 is rotatably connected to the connecting seat I 47. The coupling I is rotatably installed inside the connecting seat I 47 and its two ends are respectively connected to the motor shaft of the servo motor I 41 and the ball screw I 42.

[0025] The saddle 44 is a vertically arranged rectangular structure. The saddle slide plate 4 also includes a connecting seat II 48 and a coupling II. The connecting seat II 48 is fixedly installed at the top of the saddle 44. The servo motor II 45 is fixedly installed at the top of the connecting seat II 48. The top of the ball screw II is rotatably connected to the connecting seat II 48. The coupling II is rotatably installed inside the connecting seat II 48 and its two ends are respectively connected to the motor shaft of the servo motor II 45 and the top of the ball screw II.

[0026] A workpiece positioning and ejection mechanism 7 is also fixedly installed on the T-slot plate 5 of the saddle slide plate 4 on one side of the intermediate drive spindle 3. The workpiece positioning and ejection mechanism 7 includes a mounting base 71, a translation device 72, and a positioning ejection head 73. The mounting base 71 is fixedly installed on the T-slot plate 5. The translation device 72 is installed on the mounting base 71 and its moving rod can move horizontally. The positioning ejection head 73 is fixedly installed on the moving rod of the translation device 72 near one end of the intermediate drive spindle 3.

[0027] The translation device 72 is a cylinder, hydraulic cylinder or linear motor. The end of the positioning ejector head 73 away from the translation device 72 is a plane. The maximum outer circle diameter of the positioning ejector head 73 is smaller than the diameter of the clamping hole of the intermediate drive spindle 3.

[0028] At least two tool holders 6 are provided on one side of the T-slot plate 5 of the intermediate drive spindle 3, and a tool holder 6 and a workpiece positioning and ejection mechanism 7 are respectively provided on the other side of the T-slot plate 5.

[0029] The end of the slide plate 46 away from the saddle 44 is provided with a connecting plane that connects to the T-slot plate 5. Several connecting screw holes 49 are distributed on the connecting plane of the slide plate 46, and several countersunk holes I 51 corresponding to the connecting screw holes 49 are provided on the T-slot plate 5.

[0030] At least two T-slots 52 are vertically arranged on the end face of the T-slot plate 5 away from the slide plate 46, and at least two countersunk holes II 61 corresponding to the T-slots 52 are provided on the knife block 6.

[0031] The upper end of the base 1 is provided with chip collection boxes 8 on both sides of the middle drive spindle 3, and the top of the base 1 is also provided with inclined chip discharge ports 11 on both sides of the middle drive spindle 3.

[0032] The intermediate drive spindle 3 is any feasible spindle in the prior art (such as patent CN 216656360U) that clamps the middle of the workpiece with a chuck and drives the workpiece to rotate.

[0033] The working principle and process of this utility model: like Figures 1 to 5 As shown, during workpiece processing, the control system first controls the chuck of the intermediate drive spindle 3 to loosen. Then, the operator or robot inserts the rod-shaped workpiece to be processed into the chuck of the intermediate drive spindle 3. Subsequently, the control system controls the bed saddle slide 4 to move, driving the positioning ejector head 73 of the workpiece positioning ejector mechanism 7 to align with the chuck of the intermediate drive spindle 3. Next, the control system controls the translation device 72 to drive the positioning ejector head 73 to push the workpiece to the predetermined position within the chuck of the intermediate drive spindle 3. Finally, the control system controls the chuck of the intermediate drive spindle 3 to tighten, completing the clamping and positioning of the workpiece to be processed. At this time, the control system starts the intermediate drive spindle 3 to rotate the workpiece. According to the preset machining program, the control system controls the saddle slides 4 on both sides of the intermediate drive spindle 3 to move according to the program, so that the tools installed on the tool holder 6 can simultaneously perform machining operations on both sides or two different sides of the workpiece. During the machining process, the CNC system will precisely coordinate the tool movement trajectory, cutting speed, feed rate, etc. on the two saddle slides 4 according to the preset program and parameters to ensure that the machining of the two sides can be carried out synchronously and matched with each other, and finally complete the machining of the workpiece. After the workpiece is machined, the control system controls the chuck of the intermediate drive spindle 3 to release, and at the same time controls the saddle slide 4 where the workpiece positioning and ejection mechanism 7 is located to move to the ejection position. Then, the control system controls the translation device 72 to drive the positioning ejection head 73 to eject the completed workpiece. Then, the positioning ejection head 73 is retracted and the next workpiece to be machined is installed.

[0034] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle, characterized in that: The system includes a base (1), a column (2), an intermediate drive spindle (3), a saddle slide (4), a T-slot plate (5), a tool holder (6), and a control system. The column (2) is fixedly installed on the upper rear side of the base (1), and the intermediate drive spindle (3) is fixedly installed in the middle position of the upper front side of the base (1). Two sets of saddle slides (4) are respectively installed on both sides of the intermediate drive spindle (3) on the front side of the column (2). The saddle slides (4) can move along the horizontally installed guide rail I (21) on the column (2). The T-slot plate (5) can slide vertically on the saddle slide (4). The tool holder (6) is installed on the T-slot plate (5) to hold the tool. The control system is electrically connected to the drive motors of the intermediate drive spindle (3) and the saddle slide (4). The saddle slide (4) includes a servo motor I (41) and a ball screw I (42). The components are: slider (43), saddle (44), servo motor II (45), ball screw II, sliding pair, and slide plate (46). The servo motor I (41) is fixedly mounted at one end of the column (2) away from the intermediate drive spindle (3). The ball screw I (42) is rotatably mounted horizontally on the column (2). The slider (43) is fixedly mounted at one end of the saddle (44) near the column (2). The slider (43) rolls with the guide rail I (21) through the built-in roller. The nut I of the ball screw I (42) is fixedly connected to the saddle (44). The servo motor II (45) is fixedly mounted at the top or upper part of the saddle (44). The ball screw II is rotatably mounted vertically on the saddle (44). The nut II of the ball screw II is fixedly connected to the slide plate (46). The slide plate (46) and the saddle (44) are rolledly connected through the sliding pair.

2. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 1, characterized in that: The saddle slide (4) also includes a connecting seat I (47) and a coupling I. The connecting seat I (47) is fixedly installed at one end of the column (2) away from the intermediate drive spindle (3). The servo motor I (41) is fixedly installed at one end of the connecting seat I (47) away from the intermediate drive spindle (3). The end of the ball screw I (42) away from the intermediate drive spindle (3) is rotatably connected to the connecting seat I (47). The coupling I is rotatably installed inside the connecting seat I (47) and its two ends are respectively connected to the motor shaft of the servo motor I (41) and the ball screw I (42).

3. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 1, characterized in that: The saddle (44) is a vertically arranged rectangular structure. The saddle slide plate (4) also includes a connecting seat II (48) and a coupling II. The connecting seat II (48) is fixedly installed at the top of the saddle (44). The servo motor II (45) is fixedly installed at the top of the connecting seat II (48). The top of the ball screw II is rotatably connected to the connecting seat II (48). The coupling II is rotatably installed inside the connecting seat II (48) and its two ends are respectively connected to the motor shaft of the servo motor II (45) and the top of the ball screw II.

4. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 1, characterized in that: A workpiece positioning and ejection mechanism (7) is also fixedly installed on the T-slot plate (5) of the saddle slide plate (4) on one side of the intermediate drive spindle (3). The workpiece positioning and ejection mechanism (7) includes a mounting base (71), a translation device (72), and a positioning ejection head (73). The mounting base (71) is fixedly installed on the T-slot plate (5). The translation device (72) is installed on the mounting base (71) and the moving rod can move horizontally. The positioning ejection head (73) is fixedly installed on the moving rod of the translation device (72) near one end of the intermediate drive spindle (3).

5. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 4, characterized in that: The translation device (72) is a cylinder, hydraulic cylinder or linear motor. The end of the positioning ejector (73) away from the translation device (72) is a plane. The maximum outer circle diameter of the positioning ejector (73) is smaller than the clamping hole diameter of the intermediate drive spindle (3).

6. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 4, characterized in that: At least two tool holders (6) are provided on one side of the T-slot plate (5) of the intermediate drive spindle (3), and tool holders (6) and workpiece positioning and ejection mechanisms (7) are provided on the other side of the T-slot plate (5).

7. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to any one of claims 1 to 6, characterized in that: The sliding plate (46) is provided with a connecting plane that connects to the T-slot plate (5) at one end away from the saddle (44). The connecting plane of the sliding plate (46) is provided with a number of connecting screw holes (49), and the T-slot plate (5) is provided with a number of countersunk holes I (51) corresponding to the connecting screw holes (49).

8. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 7, characterized in that: At least two T-slots (52) are vertically arranged on the end face of the T-slot plate (5) away from the slide plate (46), and at least two countersunk holes II (61) corresponding to the T-slots (52) are provided on the knife block (6).

9. The CNC machine tool for double-sided vertical cutting machining with a centrally driven spindle according to claim 7, characterized in that: The upper end of the base (1) is provided with chip collection boxes (8) on both sides of the middle drive spindle (3), and the top of the base (1) is also provided with inclined chip discharge ports (11) on both sides of the middle drive spindle (3).

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