A rotary milling and turning composite CNC machine tool with a high rigidity structure

Abstract

This invention discloses a rotary milling and turning composite CNC machine tool with a high-rigidity structure, comprising: a base; a frame, including a base frame and a top frame; a workpiece platform mounted on the base frame; a machining platform located between the base frame and the top frame and slidably connected to the column, the machining platform including a rotary unit and a linear translation unit, the linear translation unit being mounted on the rotary unit and rotating horizontally under the drive of the rotary unit; a machining element sliding on the linear translation unit; and a CNC unit including a CNC panel. This invention, by sliding the machining platform on the frame, and with the rotary unit and linear translation unit of the machining platform working together to form a planar motion trajectory, drives the machining element to any point within its stroke. Compared to a cross slide structure, it has more support points, higher rigidity, and structural stability, ensuring stable operation of the machining element and high machining accuracy of the parts; moreover, it has a larger machining range within the same volume, saving floor space.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and in particular to a rotary milling and turning composite CNC machine tool with a high rigidity structure. Background Technology

[0002] A CNC machine tool is an automated machine tool equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, decode them, represent them with coded numbers, input them into the CNC device through an information carrier, and after calculation and processing, the CNC device sends out various control signals to control the machine tool's movements, automatically machining parts according to the shape and size required by the drawings.

[0003] To improve the functionality of CNC machine tools, milling-turning composite CNC machine tools are becoming increasingly common. Currently, the spindle of a milling-turning composite machine tool needs to move within the machine to achieve the milling and turning functions of parts. Traditionally, the motion structure driving the spindle often uses a cross slide structure. This cross slide structure can drive the spindle to any point within its travel range. However, the cross slide structure has a two-way suspended rail and few supporting parts, leading to unstable operation and affecting machining accuracy during milling and turning. Summary of the Invention

[0004] The main objective of this invention is to provide a rotary milling and turning composite CNC machine tool with a high rigidity structure, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a rotary milling and turning composite CNC machine tool with a high rigidity structure, comprising:

[0006] Base;

[0007] The frame includes a base frame and a top frame, which are connected by columns.

[0008] The workpiece platform is mounted on the base frame;

[0009] The processing platform is located between the base frame and the top frame and is slidably connected to the column. The processing platform includes a rotating unit and a linear translation unit. The linear translation unit is installed on the rotating unit and rotates horizontally under the drive of the rotating unit.

[0010] The processing element is mounted on a linear translation unit and slides linearly on the linear translation unit;

[0011] The numerical control unit includes a numerical control panel, which is fixed to the base by a support rod.

[0012] Preferably, it also includes a machine tool cover, wherein a transparent observation window is embedded in the side wall of the machine tool cover, and a lifting cylinder is installed on the top frame, wherein the output extension and retraction part of the lifting cylinder is connected to the machine tool cover.

[0013] Preferably, the workpiece platform includes an upper support ring, a lower support ring, a rotating disk, and a rotating ring. The rotating ring is located between the upper and lower support rings and the rotating disk is fixedly connected to its top surface. The upper and lower support rings are placed inside the base frame and fixedly connected to it. The outer side of the rotating ring is provided with a raised annular structure and a ring rack is provided on the raised annular structure. A motor is installed on the lower support ring. A shaft is fixedly connected to the output end of the motor. A drive gear that meshes with the ring rack is fixedly connected to the shaft. Several circumferentially distributed bearing seats are provided between the upper and lower support rings. Two tapered ball bearings are installed on each bearing seat. The two tapered ball bearings are located on the upper and lower sides of the raised annular structure and are fitted together.

[0014] Preferably, the rotating unit includes an outer ring frame and a rotating frame, the rotating frame being rotatably arranged relative to the outer ring frame, the linear translation unit being installed on the rotating frame, a circumferentially distributed nut slide table being fixedly connected to the outer side of the outer ring frame, a slide groove matching the nut slide table being provided on the inner side of the column, a Z-axis lead screw being movably connected between the base frame and the top frame, and a motor II being installed on the base frame and driven by the Z-axis lead screw, the Z-axis lead screw being threadedly connected to the nut slide table.

[0015] Preferably, the inner side of the outer ring frame is fixedly connected to several circumferentially distributed bearing mounting seats II, and each bearing mounting seat II is equipped with two tapered ball bearings II. The outer side of the rotating frame is provided with a raised annular structure and a ring rack II on the raised annular structure. The two tapered ball bearings II are respectively located on the upper and lower sides of the raised annular structure and are fitted together. The upper and lower end faces of the outer ring frame are respectively fixedly connected to an upper sealing ring and a lower sealing ring, and a shaft II is movably connected between the upper sealing ring and the lower sealing ring. A drive gear II that meshes with the ring rack II is fixedly connected to the shaft II. A motor III is installed on the outer side of the outer ring frame. The output end of the motor III is connected to one end of the shaft II through a transmission belt. The inner side of the outer ring frame is provided with two limiting frames, which are arranged vertically. The upper and lower tapered ball bearings II on the bearing mounting seats II move through the upper and lower limiting frames respectively.

[0016] Preferably, the linear translation unit includes X-axis guide rails symmetrically fixed inside the rotating frame, each of the two X-axis guide rails is provided with a double-sided symmetrical lead screw, and both ends of the two X-axis guide rails are provided with transmission boxes fixed on the rotating frame. The two transmission boxes are connected to the double-sided symmetrical lead screws on the two X-axis guide rails.

[0017] Preferably, a motor is installed on one side of the transmission box, and a synchronous pulley is provided inside the transmission box, which is movably connected to two double-sided symmetrical lead screws respectively. The output part of the motor is connected to a drive wheel, and the drive wheel and the synchronous pulley are connected by a double-drive synchronous belt.

[0018] Preferably, the processing element includes a machine tool spindle, on which a processing tool is mounted, and on both sides of the machine tool spindle are threaded connections of threaded connections between the threaded connections of ...

[0019] Compared with traditional technologies, the beneficial effects of this invention are as follows: This invention uses a sliding connection of the processing platform on the upright frame, and the rotation unit and linear translation unit of the processing platform work together to form a planar motion trajectory, thereby driving the processing element to any point within the stroke. Compared with the cross slide structure, it has more support points, stronger rigidity, and more stable structure, ensuring the stable operation of the processing element and the high processing accuracy of the parts; and it has a larger processing range for the same volume, saving floor space. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a partial three-dimensional schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of the workpiece platform of the present invention;

[0023] Figure 4 This is a three-dimensional schematic diagram of the workpiece platform portion of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the processing platform of the present invention;

[0025] Figure 6 This is a partial disassembly diagram of the processing platform of the present invention. Figure 1 ;

[0026] Figure 7 This is a partial disassembly diagram of the processing platform of the present invention. Figure 2 ;

[0027] Figure 8 This is a partial disassembly diagram of the processing platform of the present invention. Figure 3 .

[0028] In the diagram: 1. Base; 101. Controller; 2. Stand; 201. Base frame; 202. Top frame; 203. Column; 2031. Slide groove; 204. Z-axis lead screw; 205. Motor II; 206. Stand block; 207. Wire frame; 3. Workpiece platform; 301. Upper support ring; 302. Lower support ring; 303. Rotary disk; 304. Rotating ring; 305. Ring rack I; 306. Motor I; 307. Shaft I; 308. Drive gear I; 309. Bearing mounting seat I; 310. Tapered ball bearing I; 4. Machining platform; 41. Rotating unit; 4101. Outer ring frame; 4102. Rotating frame; 4103. Lead screw slide; 4104. Bearing mounting seat II; 4105. Tapered ball bearing 4106. Ring rack II; 4107. Upper sealing ring; 4108. Lower sealing ring; 4109. Shaft II; 4110. Drive gear II; 4111. Motor III; 4112. Transmission belt; 4113. Limiting frame; 42. Linear translation unit; 4201. X-axis guide rail; 4202. Double-sided symmetrical lead screw; 4203. Transmission box; 4204. Motor IV; 4205. Synchronous pulley; 4206. Drive wheel; 4207. Synchronous belt; 5. Machining element; 501. Machine tool spindle; 502. Machining tool; 503. Lead screw block; 504. Wire harness; 6. CNC unit; 601. CNC panel; 602. Support rod; 7. Machine tool cover; 701. Transparent observation window; 8. Lifting cylinder. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] like Figure 1-8As shown, this embodiment provides a rotary milling and turning composite CNC machine tool with a high rigidity structure, which includes: a base 1, a controller compartment 101 inside the base 1, and a support frame 2 fixed on the top of the base 1. The support frame 2 includes a base frame 201 and a top frame 202, which are connected by columns 203. Specifically, there are four columns 203 distributed circumferentially. Compared with the existing single-sided single-column support spindle machining structure, the four columns 203 provide stronger rigidity and stability, are less prone to structural deformation under large cutting forces, and have better machining accuracy and stability. The controller compartment 101 is located below the base frame 201, and the base frame 201 is located on... A workpiece platform 3 is provided for placing the parts to be processed. A processing platform 4 is provided between the base frame 201 and the top frame 202. The processing platform 4 includes a rotating unit 41 and a linear translation unit 42. The linear translation unit 42 is mounted on the rotating unit 41 and rotates horizontally under the drive of the rotating unit 41. The rotating unit 41 is slidably connected to the inner side of the column 203. A processing element 5 is provided on the linear translation unit 42. The processing element 5 slides linearly on the linear translation unit 42. A CNC unit 6 is provided for controlling the composite CNC machine tool. It includes a CNC panel 601, which is fixed to the base 1 by a support rod 602.

[0031] By sliding the processing platform 4 on the upright 2, and with the rotation unit 41 and linear translation unit 42 of the processing platform 4 working together to form a planar motion trajectory, the processing element 5 is driven to any point within the stroke. Compared with the cross slide structure, it has more support points, stronger rigidity, and more stable structure, ensuring the stable operation of the processing element 5 and the high processing accuracy of the parts; and with the same volume, the processing range is larger, saving floor space.

[0032] like Figure 1-2 As shown, as a further structural optimization, the milling and turning composite CNC machine tool also includes a machine tool cover 7. A transparent observation window 701 is embedded in the side wall of the machine tool cover 7. A lifting cylinder 8 is installed on the top frame 202. The output extension and retraction part of the lifting cylinder 8 is connected to the machine tool cover 7. Specifically, the machine tool cover 7 has a four-sided structure, and a transparent observation window 701 is embedded in each side. The lifting cylinder 8 drives the machine tool cover 7 to rise and fall. When it is raised, the workpiece can be installed and fixed from all four sides, which is convenient for installation. At the same time, the processing status of the workpiece can be observed in real time using the transparent observation window 701.

[0033] The workpiece platform 3 is further optimized so that it can rotate around the base frame 201, enabling three-dimensional milling and turning of the workpiece, and can also turn workpieces with larger diameters.

[0034] like Figure 3 , 4As shown, the workpiece platform 3 specifically includes an upper support ring 301, a lower support ring 302, a rotating disk 303, and a rotating ring 304. The rotating ring 304 is located between the upper support ring 301 and the lower support ring 302, and its top surface is fixedly connected to the rotating disk 303. The upper support ring 301 and the lower support ring 302 are placed inside the base frame 201 and fixedly connected to the base frame 201. The outer side of the rotating ring 304 is provided with a raised annular structure, and the raised annular structure is provided with an annular rack 305. An electric motor is installed on the lower support ring 302. The output end of the motor 306 is fixedly connected to a shaft 307. A drive gear 308 that meshes with a ring rack 305 is fixedly connected to the shaft 307. Several circumferentially distributed bearing seats 309 are provided between the upper support ring 301 and the lower support ring 302. Each bearing seat 309 is equipped with two tapered ball bearings 310. The two tapered ball bearings 310 are respectively located on the upper and lower sides of the raised ring structure and are fitted together.

[0035] Motor 306 drives drive gear 308 to rotate. Drive gear 308 meshes with ring rack 305, driving rotating ring 304 to rotate, which in turn drives rotating disk 303 on rotating ring 304 to rotate. Two rows of tapered ball bearings 310 arranged on the circumference provide rolling limit support for the raised ring structure on rotating ring 304, ensuring the rotational stability of rotating ring 304. The tapered ball bearings use a tapered surface combination, which makes the fit tighter and eliminates additional friction during movement, making the structure more stable. The drive structure is set with two symmetrically arranged motors 306, and two matching drive gears 308. The double-sided symmetrical drive can eliminate gear backlash and greatly improve transmission accuracy. At the same time, the ring gear is a high-precision helical gear, which further improves the transmission accuracy.

[0036] like Figure 1 , 5 As shown in Figure 6, the rotating unit 41 is further optimized. The rotating unit 41 includes an outer ring frame 4101 and a rotating frame 4102. The rotating frame 4102 is rotatably arranged relative to the outer ring frame 4101. The linear translation unit 42 is installed on the rotating frame 4102. A circumferentially distributed nut slide 4103 is fixedly connected to the outer side of the outer ring frame 4101. The inner side of the column 203 is provided with a slide groove 2031 that matches the nut slide 4103. A Z-axis lead screw 204 is movably connected between the base frame 201 and the top frame 202. A motor 205 that is drivenly connected to the Z-axis lead screw 204 is installed on the base frame 201. The Z-axis lead screw 204 is threadedly connected to the nut slide 4103.

[0037] Motor 205 is a servo motor. Motor 205 drives the Z-axis lead screw 204 to rotate, causing the lead screw nut slide 4103 to rise and fall relative to the Z-axis lead screw 204, thereby driving the rotating unit 41 to rise and fall on the Z-axis. Each column 203 is provided with a slide groove 2031, and there are four matching Z-axis lead screws 204 and lead screw nut slides 4103, which ensures the smoothness of the rising and falling of the rotating unit 41 and improves the machining accuracy of the workpiece. In addition, the rotating frame 4102 rotates within the outer ring frame 4101, driving the linear translation unit 42 to rotate. The two work together to achieve the motion trajectory of any point on the plane, with stable operation and high precision.

[0038] like Figure 5 , 6 As shown in Figure 7, furthermore, a plurality of circumferentially distributed bearing mounting seats 4104 are fixedly connected to the inner side of the outer ring frame 4101. Each bearing mounting seat 4104 is equipped with two tapered ball bearings 4105. The outer side of the rotating frame 4102 is provided with a raised annular structure and an annular rack 4106 is provided on the raised annular structure. The two tapered ball bearings 4105 are respectively located on the upper and lower sides of the raised annular structure and are fitted together. The upper and lower end faces of the outer ring frame 4101 are respectively fixedly connected with an upper sealing ring 4107 and a lower sealing ring 4108. A shaft 4109 is movably connected between 08 and 4109. A drive gear 4110 that meshes with a ring rack 4106 is fixedly connected to the shaft 4109. A motor 4111 is installed on the outside of the outer ring frame 4101. The output end of the motor 4111 is connected to one end of the shaft 4109 via a transmission belt 4112. A limiting frame 4113 is provided on the inner side of the outer ring frame 4101. There are two limiting frames 4113, which are arranged vertically. The upper and lower tapered ball bearings 4105 on the bearing fixing seat 4104 move through the upper and lower limiting frames 4113 respectively.

[0039] The upper and lower limit brackets 4113 respectively limit the two rows of tapered ball bearings 4105 distributed circumferentially, ensuring the operational stability of the tapered ball bearings 4105. The upper and lower rows of tapered ball bearings 4105 provide rolling limit support to the upper protruding ring structure, ensuring the rotational stability of the rotating frame 4102. Furthermore, the tapered roller bearings 4105 feature a tapered surface combination, resulting in a tighter fit and eliminating additional friction during movement, thus making the structure more stable. The third motor 4111 is a three-dimensional servo motor, which is connected to the transmission belt 411. 2. The shaft 4109 rotates, and the drive gear 4110 on the shaft 4109 meshes with the ring rack 4106. Utilizing the gear transmission principle, this drives the rotating frame 4102 to rotate, resulting in high rotational precision and easy control of the rotation angle of the rotating frame 4102. Furthermore, the drive structure is configured with two symmetrically arranged motors 4111 and two matching drive gears 4110. This double-sided symmetrical drive eliminates gear backlash and significantly improves transmission precision. Additionally, the ring rack 4110 uses a high-precision helical gear, further enhancing transmission accuracy.

[0040] like Figure 6-8 As shown, the linear translation unit 42 includes X-axis guide rails 4201 symmetrically fixed inside the rotating frame 4102. Each of the two X-axis guide rails 4201 contains a double-sided symmetrical lead screw 4202. Both ends of the two X-axis guide rails 4201 are equipped with transmission boxes 4203 fixed to the rotating frame 4102. The two transmission boxes 4203 are connected to the double-sided symmetrical lead screws 4202 on the two X-axis guide rails 4201. The two transmission boxes 4203 simultaneously drive the two double-sided symmetrical lead screws 4202 to rotate. Using double-sided symmetrical lead screws 4202 for driving eliminates lead screw backlash, greatly improving transmission accuracy and structural stability. Specifically… A motor 4204 is installed on one side of the transmission box 4203. The motor 4204 is a servo motor. The transmission box 4203 is equipped with synchronous pulleys 4205 that are movably connected to two double-sided symmetrical lead screws 4202. The output part of the motor 4204 is connected to a drive wheel 4206. The drive wheel 4206 and the synchronous pulleys 4205 are connected by a synchronous belt 4207. The motor 4204 drives the drive wheel 4206 to rotate, and the synchronous belt 4207 drives the two synchronous pulleys 4205 to rotate synchronously. The synchronous pulleys 4205 are fixedly connected to the double-sided symmetrical lead screws 4202, and drive the double-sided symmetrical lead screws 4202 to rotate.

[0041] like Figure 5-8As shown, the machining element 5 includes a machine tool spindle 501, on which machining tools 502 are mounted. The machining tools 502 include vertical turning tools, milling cutters, and other workpiece machining tools. Nut blocks 503 are provided on both sides of the machine tool spindle 501. The nut blocks 503 are threadedly connected to a double-sided symmetrical lead screw 4202. By rotating the double-sided symmetrical lead screw 4202, the machine tool spindle 501 is driven to slide between the X-axis guide rails 4201, resulting in high movement accuracy and improved workpiece machining accuracy. A wire harness conduit 504 is connected to the machine tool spindle 501. A wire frame 207 is fixedly connected to the top of the top frame 202 via a stand block 206. The wire harness conduit 504 is connected to the wire frame 207 via bearings. The wire harness conduit 504 is used to insert air pipes, data, and current transmission wire harnesses.

[0042] The working principle of this invention is as follows: by sliding the processing platform on the upright, and the rotation unit and linear translation unit of the processing platform working together to form a planar motion trajectory, the processing element is driven to any point within the stroke. Compared with the cross slide structure, it has more support points, stronger rigidity, and more stable structure, which ensures the stable operation of the processing element and the high processing accuracy of the parts; and the processing range is larger under the same volume, saving floor space.

[0043] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A rotary milling and turning composite CNC machine tool with a high rigidity structure, characterized in that: It includes: Base; The frame includes a base frame and a top frame, which are connected by columns. The workpiece platform is mounted on the base frame; A machining platform is located between a base frame and a top frame and is slidably connected to a column. The machining platform includes a rotating unit and a linear translation unit. The linear translation unit is mounted on the rotating unit and rotates horizontally under its drive. The rotating unit includes an outer ring frame and a rotating frame. The rotating frame is rotatably arranged relative to the outer ring frame. The linear translation unit is mounted on the rotating frame. A circumferentially distributed threaded nut slide is fixedly connected to the outer ring frame. A groove matching the threaded nut slide is provided on the inner side of the column. A Z-axis lead screw is movably connected between the base frame and the top frame, and a motor II, driven by the Z-axis lead screw, is mounted on the base frame. The Z-axis lead screw is threadedly connected to the threaded nut slide. Several circumferentially distributed bearing seats II are fixedly connected to the inner side of the outer ring frame. Each bearing seat II is equipped with two tapered ball bearings II. The outer side of the rotating frame has a raised annular structure with an annular rack II on it. Two tapered ball bearings are respectively located on the upper and lower sides of the raised annular structure and are fitted together. The upper and lower end faces of the outer ring frame are respectively fixedly connected to an upper sealing ring and a lower sealing ring, and a shaft is movably connected between the upper sealing ring and the lower sealing ring. A drive gear two that meshes with a ring rack two is fixedly connected to the shaft two. A motor three is installed on the outside of the outer ring frame. The output end of the motor three is connected to one end of the shaft two through a transmission belt. A limiting frame is provided on the inner side of the outer ring frame. There are two limiting frames, which are arranged vertically. The upper and lower tapered ball bearings two on the bearing fixing seat two move through the upper and lower limiting frames respectively. The linear translation unit includes X-axis guide rails symmetrically fixed on the inner side of the rotating frame. A double-sided symmetrical lead screw is provided in each of the two X-axis guide rails. A transmission box is fixed on the rotating frame at both ends of the two X-axis guide rails. The two transmission boxes are connected to the double-sided symmetrical lead screws on the two X-axis guide rails. The processing element is mounted on a linear translation unit and slides linearly on the linear translation unit; The numerical control unit includes a numerical control panel, which is fixed to the base by a support rod.

2. The rotary milling and turning composite CNC machine tool with a high rigidity structure according to claim 1, characterized in that: It also includes a machine tool cover, on the side wall of which a transparent observation window is embedded, and a lifting cylinder is installed on the top frame, the output extension and retraction part of which is connected to the machine tool cover.

3. A rotary milling and turning composite CNC machine tool with a high rigidity structure according to claim 1, characterized in that: The workpiece platform includes an upper support ring, a lower support ring, a rotating disk, and a rotating ring. The rotating ring is located between the upper and lower support rings and the rotating disk is fixedly connected to its top surface. The upper and lower support rings are placed inside the base frame and fixedly connected to it. The outer side of the rotating ring has a raised annular structure with a ring rack on it. A motor is mounted on the lower support ring, and a shaft is fixedly connected to the output end of the motor. A drive gear that meshes with the ring rack is fixedly connected to the shaft. Several circumferentially distributed bearing seats are located between the upper and lower support rings. Each bearing seat has two tapered ball bearings mounted on it. The two tapered ball bearings are located on the upper and lower sides of the raised annular structure and are fitted together.

4. A rotary milling and turning composite CNC machine tool with a high rigidity structure according to claim 1, characterized in that: Motor 4 is installed on one side of the transmission box. Synchronous pulleys are provided inside the transmission box and are movably connected to two double-sided symmetrical lead screws. The output part of motor 4 is connected to a drive wheel. The drive wheel and the synchronous pulley are connected by a double-drive synchronous belt.

5. A rotary milling and turning composite CNC machine tool with a high rigidity structure according to any one of claims 1-4, characterized in that: The processing element includes a machine tool spindle, on which a processing tool is mounted. Threaded nuts are provided on both sides of the machine tool spindle, and the threaded nuts are threadedly connected to a double-sided symmetrical lead screw. A wire harness is connected to the machine tool spindle, and a wire frame is fixedly connected to the top of the top frame through a vertical block. The wire harness is connected to the wire frame through a bearing.

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