High speed double exchange worktable horizontal machining center

Abstract

The utility model discloses a high -speed type double exchange workstation horizontal machining center, including bed body part, stand part, main shaft box part, exchange workstation part, tool magazine part and cooling part. Adopt fixed column type wallboard structure, combine light weight design and high dynamic servo drive system, significantly reduce the weight of mobile part, improve the dynamic response of feeding and machining accuracy. Double exchange workstation realizes processing and feeding synchronization, and the equipment utilization is high. The utility model is suitable for high -speed, high -precision processing, especially suitable for the mass production of complex curved surface workpiece.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to a high-speed horizontal machining center with a double-exchange worktable. Background Technology

[0002] In the field of CNC machine tools, horizontal machining centers are machine tools that perform milling operations using a horizontally positioned spindle. Because the spindle is horizontally arranged, the cutting tool reciprocates along the side of the workpiece, effectively removing chips. Horizontal machining centers can also be equipped with dual-change tables to achieve unattended operation and shorten the workpiece machining cycle. Dual-change table horizontal machining centers have two worktables, one for machining and one for loading, equipped with an automatic exchange device. This allows for simultaneous workpiece clamping and machining, significantly reducing waiting time for workpiece clamping and improving equipment utilization.

[0003] Existing horizontal machining centers mainly fall into two categories: moving column type and fixed column type. Moving column type centers are further divided into two structures: upright T-shaped and inverted T-shaped. The upright T-shaped center column moves along the X-axis, while the inverted T-shaped center column moves along the Z-axis; both share the characteristic of column movement. Fixed column type centers primarily employ a box-in-box structure, using dual servo motors to drive X-axis movement.

[0004] The main characteristic of the moving column type is that the column can move. Due to the large weight of the column itself, the drive motor is under heavy load and has a slow response speed, resulting in poor feed dynamics and accuracy, and weak high-speed machining capability. The fixed column type mainly adopts a box-in-box structure. This structure mainly uses dual servo motor drive. Due to parallelism and temperature errors, the dual servo motor drive is prone to jamming or even freezing at high speeds, seriously affecting the reliability of the equipment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a high-speed, dual-exchange table horizontal machining center. This horizontal machining center adopts a fixed-column wall panel structure, which significantly reduces the weight of moving parts, lightens the load on servo motors, improves the dynamic response of feed axes, and enhances the machining quality of workpiece surfaces, especially complex curved surfaces. The three-axis feed utilizes servo motors with high dynamic characteristics and is matched with an optimal inertia ratio. Each moving part is designed for lightweighting through finite element topology optimization, achieving a rapid traverse speed of up to 60 m / min and a maximum acceleration of 0.8G. This horizontal machining center also employs a single servo motor center-of-gravity drive, achieving high dynamic and low-cost characteristics with high reliability while maintaining low moving part weight.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a high-speed horizontal machining center with a double-exchange table, comprising a bed assembly, a column assembly, a spindle box assembly, an exchange table assembly, a tool magazine assembly, and a cooling assembly. Its innovation lies in: The bed component includes a bed, on which a Z-axis guide rail assembly, a Z-axis ball screw pair and a Z-axis drive motor are mounted. A turntable is mounted on the Z-axis guide rail assembly and the turntable is connected to the Z-axis ball screw pair. The exchange worktable component is located at the front end of the bed and includes a processing area worktable, a loading area worktable, an exchange base, a bridge plate, a rotary table, and an exchange drive mechanism. The processing area worktable is mounted on the rotary table. The exchange base is fixed to the front end of the bed and has the loading area worktable mounted on it. The bridge plate is connected to the exchange base via a lifting mechanism. The rotary table is mounted on the bridge plate via the exchange drive mechanism and is used to carry and exchange the processing area worktable and the loading area worktable. The column component includes a column fixed to the rear end of the bed. An X-axis guide rail assembly, an X-axis ball screw pair, and an X-axis drive motor are mounted on the column. An X-axis slide is mounted on the X-axis guide rail assembly. A Y-axis guide rail assembly, a Y-axis ball screw pair, and a Y-axis drive motor are mounted on the X-axis slide. A Y-axis slide is mounted on the Y-axis guide rail assembly. The spindle box assembly includes a spindle box fixed to the Y-axis slide and an HSK type electric spindle mounted on the spindle box.

[0007] Furthermore, the switching drive mechanism includes a planetary reducer and a switching servo motor mounted on the rotary table, and the switching servo motor drives the rotary table to rotate through the planetary reducer.

[0008] Furthermore, the lifting mechanism consists of hydraulic cylinders respectively located at both ends of the exchange base, and the piston rods of the hydraulic cylinders are connected to the bridge plate.

[0009] Furthermore, the tool magazine component is connected to the left side of the bed and includes a tool head bracket, a tool head mounted on the tool head bracket, a cam box bracket, and a cam box mounted on the cam box bracket via a transition plate and an adjusting block. A tool changing arm is mounted at the front end of the cam box.

[0010] Furthermore, the cooling components are arranged at the rear of the bed and include a water tank, a chain plate chip conveyor mounted on the water tank, a level gauge, a chip flushing water pump, and a cooling water pump mounted on the water tank; a filter screen is provided between the chain plate chip conveyor and the water tank's pumping area.

[0011] Furthermore, a spiral chip conveyor is installed on each side of the bed, and the spiral chip conveyor is driven by a spiral chip conveyor motor.

[0012] Furthermore, the X-axis drive motor, Y-axis drive motor, and Z-axis drive motor are all high-dynamic-characteristic servo motors, and their inertia ratios with the moving parts they drive are optimized and matched.

[0013] Furthermore, the X-axis slide, Y-axis slide, and spindle box all adopt finite element topology optimization structure to achieve lightweight design, enabling the machining center to achieve a rapid traverse speed of 60m / min and a maximum acceleration of 0.8G.

[0014] The beneficial effects of this utility model after adopting the above structure are as follows: This utility model adopts a fixed column wall panel structure, which can significantly reduce the weight of movable parts, reduce the load on the servo motor, improve the dynamic response of the feed axis, and improve the machining quality of the workpiece surface, especially complex curved surfaces.

[0015] The three-way feed uses a servo motor with high dynamic characteristics and is matched with the optimal inertia ratio. Each moving part is designed to be lightweight through finite element topology optimization. The rapid traverse speed can reach 60m / min and the maximum acceleration can reach 0.8G.

[0016] This invention also employs a single servo motor center-of-gravity drive, which achieves high dynamic and low-cost characteristics and high reliability under the condition of low weight of moving parts. Attached Figure Description

[0017] Figure 1 This is an isometric structural diagram of the high-speed dual-exchange table horizontal machining center disclosed in this invention. Figure 2 This is an isometric schematic diagram of the bed components of the high-speed dual-exchange table horizontal machining center disclosed in this invention. Figure 3 This is an isometric schematic diagram of the tool magazine component of the high-speed dual-exchange table horizontal machining center disclosed in this invention. Figure 4 This is an isometric schematic diagram of the cooling components of the high-speed dual-exchange table horizontal machining center disclosed in this invention.

[0018] Explanation of reference numerals in the attached figures: 1-Column, 2-Y-guide rail assembly, 3-X-guide rail assembly, 4-spindle box, 5-HSK type electric spindle, 6-Y-axis slide, 7-interchange servo motor, 8-planetary reducer, 9-rotary table, 10-loading area worktable, 11-Y-axis drive motor, 12-Y-axis ball screw pair, 13-X-axis slide, 14-X-axis ball screw pair, 15-X-axis drive motor, 16-bed, 17-machining area worktable, 18-rotary table, 19-bridge plate, 20-interchange base, 21- 22-Z-direction rear guide rail protective cover, 23-Z-direction ball screw pair, 24-Z-direction guide rail assembly, 25-Z-direction forward guide rail protective cover, 26-spiral chip conveyor, 27-Z-direction drive motor, 28-spiral chip conveyor motor, 29-cutter disc, 30-cutter disc bracket, 31-cam box, 32-transition plate, 33-adjusting block, 34-cam box bracket, 35-chain plate chip conveyor, 36-level gauge, 37-chip flushing water pump, 38-cooling water pump, 39-water tank, 40-filter screen. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] 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 specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0021] See Figure 1-4 This embodiment of a high-speed dual-exchange table horizontal machining center includes a bed assembly, a column assembly, a spindle box assembly, an exchange table assembly, a tool magazine assembly, and a cooling assembly.

[0022] The present invention includes a bed component, which includes a bed 16. A Z-axis guide rail assembly 23, a Z-axis ball screw pair 22, and a Z-axis drive motor 26 are mounted on the bed 16. A turntable 18 is mounted on the Z-axis guide rail assembly 23. The turntable 18 is connected to the Z-axis ball screw pair 22 and is driven by the Z-axis drive motor 26 to achieve Z-axis feed motion.

[0023] The machine bed 16 has an exchange table component installed at its front end. This exchange table component includes a rotary table 18, on which a processing worktable 17 is mounted. The processing worktable 17 is driven by a rotary table motor and gear transmission system, enabling rotary motion to achieve workpiece rotation and orientation adjustment. The machine bed 16 also has an exchange base 20 at its front end. Hydraulic cylinders are mounted at both ends of the exchange base 20, and these cylinders are connected to a bridge plate 19, driving the bridge plate 19 to rise and fall. A loading area worktable 10 is also mounted on the exchange base 20. A rotary table 9 is mounted on the bridge plate 19, and a planetary reducer 8 and an exchange servo motor 7 are mounted on the rotary table 9. The exchange servo motor 7 drives the rotary table 9 to rotate, enabling automatic exchange between the processing area worktable 17 and the loading area worktable 10.

[0024] Through a specific design of the exchange table components—the exchange servo motor 7 drives the planetary reducer 8 and the rotary table 9 to achieve 180° rotation, which, in conjunction with the hydraulic cylinder on the exchange base 20, drives the lifting and lowering movement of the bridge plate 19—this structure enables automatic and rapid exchange between the processing area worktable 17 and the loading area worktable 10. Operators can clamp workpieces in the loading area while the machine tool performs cutting in the processing area, completely overlapping the workpiece clamping time with the machine tool processing time. This virtually eliminates waiting time, significantly improves equipment utilization, and lays the foundation for unmanned production.

[0025] A column assembly is installed at the rear end of the bed 16. The column assembly includes a column 1, which is fixed to the bed 16. An X-axis guide rail assembly 3, an X-axis ball screw pair 14, and an X-axis drive motor 15 are mounted on the column 1. An X-axis slide 13 is mounted on the X-axis guide rail assembly 3. The X-axis slide 13 is connected to the X-axis ball screw pair 14 and driven by the X-axis drive motor 15 to achieve X-axis feed motion. A Y-axis guide rail assembly 2, a Y-axis ball screw pair 12, and a Y-axis drive motor 11 are also mounted on the X-axis slide 13. A Y-axis slide 6 is mounted on the Y-axis guide rail assembly 2 and is connected to the Y-axis ball screw pair 12. It is driven by the Y-axis drive motor 11 to achieve Y-axis feed motion.

[0026] This invention employs a structure combining a fixed column 1 with lightweight X-axis slides 13 and Y-axis slides 6 optimized by finite element topology and a spindle box 4. Compared to existing moving column structures, this significantly reduces the mass and inertia of the moving parts in the X and Y feed systems. This results in a substantial reduction in the load on the X-axis drive motor 15 and the Y-axis drive motor 11, enabling higher feed acceleration and faster response speeds. The direct technical benefit is that the machine tool's rapid traverse speed can reach 60 m / min, and the maximum acceleration can reach 0.8G, thereby greatly improving the trajectory following accuracy and surface finish during complex surface machining.

[0027] In the X-axis feed, this invention abandons the dual servo motor drive scheme commonly used in existing fixed-column "box-in-box" structures, and adopts a single X-axis drive motor 15 in conjunction with an X-axis ball screw pair 14. This single servo motor center-of-gravity drive scheme fundamentally eliminates the parallelism error, synchronization error, and jamming risk caused by uneven temperature rise resulting from dual-motor drives. With the mass of the moving parts significantly reduced, a single motor drive can provide sufficient power, resulting in a simpler structure, lower manufacturing cost, and ensuring extremely high reliability and stability at high speeds, avoiding jamming or stalling.

[0028] Each side of the bed is equipped with a spiral chip conveyor 25, which is driven by a spiral chip conveyor motor 27 to achieve the function of discharging chips to the rear of the bed.

[0029] A spindle box assembly is installed on the Y-axis slide 6. The spindle box assembly includes a spindle box 4, which is fixed to the Y-axis slide 6, and an HSK type electric spindle 5 is installed on the spindle box 4.

[0030] The tool magazine assembly is connected to the left side of the bed 16. The tool magazine assembly includes a tool head support 30, with a tool head 28 mounted on its upper surface. A cam box support 34 is mounted on the right side of the tool head support 30. A transition plate 32 and an adjusting block 33 are mounted on the cam box support 34. A cam box 31 is mounted on the transition plate 32, and its position can be adjusted via the transition plate 32 and the adjusting block 33. A tool changing arm 29 is mounted on the front end of the cam box 31, forming a tool changing mechanism.

[0031] A cooling system is located at the rear of the bed 16, providing cooling and chip removal for the entire machine tool. The cooling system includes a water tank 39, on which a chain-plate chip conveyor 35 is installed for chip removal. A level gauge 36 is installed on the front left side of the water tank 39 for monitoring the water level. A chip removal water pump 37 and a cooling water pump 38 are installed on the upper part of the water tank 39. Two filters 40 are arranged between the chain-plate chip conveyor 35 and the water pump pump area of ​​the water tank 39 to prevent chips from entering the water circulation system.

[0032] A spiral chip conveyor 25 is arranged on each side of the bed 16 to transport the chips backward; the chain plate chip conveyor 35 in the rear cooling unit finally discharges the chips, while the chip flushing water pump 37 and the cooling water pump 38 provide coolant, which is filtered by two filters 40. This multi-stage chip removal and filtration system ensures the cleanliness of the cutting area and the coolant circulation system, effectively prevents the impact of chip accumulation on machining accuracy, and prevents chips from entering the water pump and damaging the equipment, thus ensuring the stability and machining quality of the machine tool during long-term continuous operation.

[0033] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A high-speed horizontal machining center with dual exchange tables, comprising a bed assembly, a column assembly, a spindle box assembly, an exchange table assembly, a tool magazine assembly, and a cooling assembly, characterized in that: The bed component includes a bed, on which a Z-axis guide rail assembly, a Z-axis ball screw pair and a Z-axis drive motor are mounted. A turntable is mounted on the Z-axis guide rail assembly and the turntable is connected to the Z-axis ball screw pair. The exchange worktable component is located at the front end of the bed and includes a processing area worktable, a loading area worktable, an exchange base, a bridge plate, a rotary table, and an exchange drive mechanism. The processing area worktable is mounted on the rotary table. The exchange base is fixed to the front end of the bed and has the loading area worktable mounted on it. The bridge plate is connected to the exchange base via a lifting mechanism. The rotary table is mounted on the bridge plate via the exchange drive mechanism and is used to carry and exchange the processing area worktable and the loading area worktable. The column component includes a column fixed to the rear end of the bed. An X-axis guide rail assembly, an X-axis ball screw pair, and an X-axis drive motor are mounted on the column. An X-axis slide is mounted on the X-axis guide rail assembly. A Y-axis guide rail assembly, a Y-axis ball screw pair, and a Y-axis drive motor are mounted on the X-axis slide. A Y-axis slide is mounted on the Y-axis guide rail assembly. The spindle box assembly includes a spindle box fixed to the Y-axis slide and an HSK type electric spindle mounted on the spindle box.

2. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The switching drive mechanism includes a planetary reducer and a switching servo motor mounted on the rotary table. The switching servo motor drives the rotary table to rotate through the planetary reducer.

3. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The lifting mechanism consists of hydraulic cylinders located at both ends of the exchange base, with the piston rods of the hydraulic cylinders connected to the bridge plate.

4. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The tool magazine assembly is connected to the left side of the machine bed and includes a tool head bracket, a tool head mounted on the tool head bracket, a cam box bracket, and a cam box mounted on the cam box bracket via a transition plate and an adjusting block. A tool changing arm is mounted at the front end of the cam box.

5. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The cooling components are arranged at the rear of the bed and include a water tank, a chain plate chip conveyor mounted on the water tank, a level gauge, a chip flushing water pump, and a cooling water pump mounted on the water tank; a filter screen is provided between the chain plate chip conveyor and the water pumping area of ​​the water tank.

6. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: A spiral chip conveyor is installed on each side of the bed, and the spiral chip conveyor is driven by a spiral chip conveyor motor.

7. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The X-axis drive motor, Y-axis drive motor, and Z-axis drive motor are all high-dynamic-characteristic servo motors, and their inertia ratios with the moving parts they drive have been optimized and matched.

8. The high-speed dual-exchange table horizontal machining center according to claim 1, characterized in that: The X-axis slide, Y-axis slide, and spindle box all adopt a finite element topology optimization structure to achieve lightweight design, enabling the machining center to achieve a rapid traverse speed of 60m / min and a maximum acceleration of 0.8G.

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