A high-precision machine tool

Abstract

This utility model relates to a high-precision machine tool, comprising: a frame, a machining table, a longitudinal drive device, guide rails, a mounting bracket, and a gantry. The frame is fixedly connected to the machining table at the top. The longitudinal drive device, guide rails, and mounting bracket are located below the machining table. The guide rails are fixedly connected to the frame, and the mounting bracket is slidably connected to the guide rails. The longitudinal drive device is mounted on the frame and drives the mounting bracket to move longitudinally. The lower ends of the support feet of the gantry are fixedly connected to the mounting bracket. This utility model uses a lead screw mechanism to drive the gantry relative to the frame, which has higher motion accuracy than a gear and rack mechanism, thus improving the machining accuracy of the workpiece. The use of four guide rails, located on both sides and in the middle of the mounting bracket, reduces gantry vibration and further improves machining accuracy. The guide rails and the first ball screw are both located below the machining table, reducing contamination of the components by workpiece chips and preventing workers from coming into contact with these components, thus preventing injury due to accidental operation.

Description

Technical Field

[0001] This utility model relates to the field of machine tools, and in particular to a high-precision machine tool. Background Technology

[0002] In the current processing of large-size sheet metal and profiles, due to the large size of the workpiece, machine tools with gantry frames are often used for machining operations. Existing gantry frames are usually driven by a gear and rack mechanism, with the rack fixed on both sides outside the frame. The rack is easily contaminated by oil and debris, which reduces the motion accuracy of the gantry frame and ultimately leads to a decrease in the machining accuracy of the workpiece.

[0003] The existing gantry cranes with sliding connections also have guide rails located on both sides outside the frame, making them susceptible to contamination by oil and debris, resulting in decreased machining accuracy. Furthermore, the gantry crane is only slidably connected to the frame via guide rails at its two side legs, causing significant vibration and hindering the improvement of machining accuracy.

[0004] The exposed racks and rails have no shielding structure, which can easily cause injury to workers if they accidentally touch them. Utility Model Content

[0005] This utility model aims to solve the above-mentioned problems by providing a high-precision machine tool that solves the problem of poor machining accuracy of gantry frames and the problem of worker injury caused by the movement mechanism of gantry frames.

[0006] A high-precision machine tool includes: a frame, a machining table, a longitudinal drive device, a guide rail, a mounting bracket, and a gantry frame. The upper part of the frame is fixedly connected to the machining table. The longitudinal drive device, the guide rail, and the mounting bracket are located below the machining table. The guide rail is fixedly connected to the frame, and the mounting bracket is slidably connected to the guide rail. The longitudinal drive device is mounted on the frame and drives the mounting bracket to move longitudinally. The lower ends of the support legs of the gantry frame are fixedly connected to the mounting bracket.

[0007] Preferably, the longitudinal drive device includes a first ball screw, a first nut, a bearing housing, and a first motor. The mounting bracket is fixedly connected to the first nut. Both ends of the first ball screw are rotatably connected to the bearing housing. The bearing housing is fixedly connected to the frame. The first nut is fitted onto the outside of the first ball screw and connected to the first ball screw. The first motor is fixedly connected to the frame and drives the first ball screw to rotate.

[0008] Preferably, the mounting bracket is slidably connected to multiple guide rails, which are arranged in a horizontal straight line and extend longitudinally.

[0009] Preferably, the mounting bracket also includes sliders, the mounting bracket is fixedly connected to multiple sliders, the sliders are slidably connected to guide rails, and the mounting bracket is slidably connected to four guide rails via sliders.

[0010] Preferably, it further includes a reinforcing frame that extends laterally and is fixedly connected to the lower part of the mounting frame, and the reinforcing frame is located between two guide rails.

[0011] Preferably, the device further includes a first mounting plate, a second mounting plate, an electric spindle, a horizontal drive device, and a vertical drive device. The first mounting plate is slidably connected to the gantry frame. The horizontal drive device is mounted on the gantry frame and drives the first mounting plate to move horizontally. The second mounting plate is slidably connected to the first mounting plate. The vertical drive device is mounted on the first mounting plate and drives the second mounting plate to move vertically. The electric spindle is fixedly connected to the second mounting plate and is connected to the cutting tool and drives the cutting tool to rotate.

[0012] Preferably, it also includes a tool magazine, which includes a third mounting plate, a reducer, a second motor, a cylinder, and a tool holder. The third mounting plate is slidably connected to the legs of the gantry frame. The two ends of the cylinder are fixedly connected to the gantry frame and the third mounting plate, respectively. The cylinder drives the third mounting plate to move laterally. The reducer is fixedly connected to the third mounting plate. The output shaft of the reducer is fixedly connected to the tool holder. Multiple tools are placed on the tool holder.

[0013] Preferably, the lateral drive device includes a third motor, a second ball screw, and a second nut. The third motor is fixedly connected to the gantry frame, and the two ends of the second ball screw are rotatably connected to the gantry frame. The third motor drives the second ball screw to rotate. The second ball screw is connected to the second nut, and the second nut is fixedly connected to the first mounting plate.

[0014] Preferably, a fixing plate is formed on the column of the frame, and the fixing plate has fixing holes. Screws pass through the fixing holes and are threadedly connected to the processing table.

[0015] Preferably, the processing table has a T-shaped groove and a liquid accumulation tank, the T-shaped groove is connected to the liquid accumulation tank, the bottom of the T-shaped groove is higher than the bottom of the liquid accumulation tank, and the bottom of the liquid accumulation tank is connected to a drain pipe.

[0016] This invention has the following advantages: The use of a lead screw mechanism to drive the gantry's longitudinal movement relative to the machine frame provides higher motion accuracy compared to a rack and pinion mechanism, thus improving the machining accuracy of the workpiece; the use of four guide rails, located on both sides and in the middle of the mounting frame, reduces gantry vibration and increases motion accuracy, further improving workpiece machining accuracy; the guide rails and the first ball screw are both located below the machining table, reducing contamination of these components by workpiece chips, improving the gantry's motion accuracy, and preventing workers from contacting these components, thus preventing injury due to misoperation; the lateral movement of the tool magazine's tool holder reduces the length requirement of the second ball screw, and a shorter second ball screw can improve structural strength, reduce deformation, and thus improve machining accuracy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0018] Figure 1 : A three-dimensional structural schematic diagram of this utility model;

[0019] Figure 2 : A three-dimensional structural diagram of this utility model after the processing table has been removed;

[0020] Figure 3 : A schematic diagram of the main structure of this utility model;

[0021] Figure 4 :exist Figure 3 A schematic diagram of the cross-sectional structure at point AA. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and examples:

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figures 1 to 4 As shown, a high-precision machine tool includes: a frame 1, a machining table 2, a longitudinal drive device 3, a guide rail 4, a mounting frame 5, and a gantry frame 6. The upper part of the frame 1 is fixedly connected to the machining table 2. The longitudinal drive device 3, the guide rail 4, and the mounting frame 5 are located below the machining table 2, which reduces the contamination of the above components by workpiece chips and avoids workers from coming into contact with the above components, thus preventing workers from being injured due to misoperation. The guide rail 4 is fixedly connected to the frame 1, and the mounting frame 5 is slidably connected to the guide rail 4. The longitudinal drive device 3 is mounted on the frame 1 and drives the mounting frame 5 to move longitudinally. The lower ends of the support legs of the gantry frame 6 are fixedly connected to the mounting frame 5.

[0027] It should be noted that the existing gantry frame 6 includes a crossbeam and legs, with both ends of the crossbeam fixedly connected to the legs.

[0028] Preferably, the longitudinal drive device 3 includes a first ball screw 31, a first nut 32, a bearing housing 33, and a first motor 34. The mounting bracket 5 is fixedly connected to the first nut 32. Both ends of the first ball screw 31 are rotatably connected to the bearing housing 33. The bearing housing 33 is fixedly connected to the frame 1. The first nut 32 is fitted onto the outside of the first ball screw 31 and connected to it. The first motor 34 is fixedly connected to the frame 1 and drives the first ball screw 31 to rotate. The longitudinal drive device 3 uses a ball screw mechanism, which provides higher precision.

[0029] Preferably, the mounting bracket 5 is slidably connected to multiple guide rails 4, which are arranged in a horizontal straight line and extend longitudinally. The multiple guide rails 4 can reduce vibration of the mounting bracket 5 and the gantry frame 6, improving machining accuracy.

[0030] Preferably, the mounting bracket 5 also includes a slider 51, which is fixedly connected to a plurality of sliders 51. The sliders 51 are slidably connected to the guide rails 4, and the mounting bracket 5 is slidably connected to the four guide rails 4 via the sliders 51.

[0031] Preferably, the mounting bracket further includes a reinforcing frame 52, which extends laterally and is fixedly connected to the lower part of the mounting bracket 5. The reinforcing frame 52 is located between the two guide rails 4. The reinforcing frame 52 is used to strengthen the lateral strength of the mounting bracket 5 and reduce the deformation of the mounting bracket 5.

[0032] Preferably, the device further includes a first mounting plate 7, a second mounting plate 8, an electric spindle 10, a horizontal drive device 61, and a vertical drive device 71. The first mounting plate 7 is slidably connected to the gantry frame 6. The horizontal drive device 61 is mounted on the gantry frame 6 and drives the first mounting plate 7 to move horizontally. The second mounting plate 8 is slidably connected to the first mounting plate 7. The vertical drive device 71 is mounted on the first mounting plate 7 and drives the second mounting plate 8 to move vertically. The electric spindle 10 is fixedly connected to the second mounting plate 8. The electric spindle 10 is connected to the tool 101 and drives the tool 101 to rotate.

[0033] Preferably, the device further includes a tool magazine 9, which comprises a third mounting plate 91, a reducer 92, a second motor 93, a cylinder 94, and a tool holder 95. The third mounting plate 91 is slidably connected to the legs of the gantry 6. The cylinder 94 is fixedly connected at both ends to the gantry 6 and the third mounting plate 91, respectively, and drives the third mounting plate 91 to move laterally. The reducer 92 is fixedly connected to the third mounting plate 91, and the output shaft of the reducer 92 is fixedly connected to the tool holder 95. Multiple tools 101 are placed on the tool holder 95. The tool holder 95 can move laterally to approach the electric spindle 10, reducing the requirement for the lateral movement stroke of the electric spindle 10, thereby reducing the lateral length of the lateral drive device 61. This is beneficial for improving the accuracy of the lateral drive device 61 in driving the first mounting plate 7 to move laterally and improving the machining accuracy of the workpiece.

[0034] Preferably, the transverse drive device 61 includes a third motor 611, a second ball screw 612, and a second nut. The third motor 611 is fixedly connected to the gantry frame 6, and the two ends of the second ball screw 612 are rotatably connected to the gantry frame 6. The third motor 611 drives the second ball screw 612 to rotate. The second ball screw 612 is connected to the second nut, and the second nut is fixedly connected to the first mounting plate 7. When the transverse drive device 61 uses a ball screw mechanism, if the length of the second ball screw 612 is too large, it will cause slight bending deformation in its middle, thus affecting the accuracy of the transverse movement of the first mounting plate 7 and the machining accuracy of the workpiece. By using the tool magazine 9 to move laterally below the second ball screw 612, the length of the second ball screw 612 can be shortened. The shorter length increases the structural strength of the second ball screw 612, reduces the deformation of the second ball screw 612, and thus improves the machining accuracy of the workpiece.

[0035] Preferably, a fixing plate 11 is formed on the column of the frame 1, and the fixing plate 11 has fixing holes. Screws pass through the fixing holes and are threadedly connected to the processing table 2, thereby fixing the processing table 2 to the frame 1. When changing the processing table 2, all screws are removed, and the different processing tables 2 are hoisted and replaced.

[0036] Preferably, the machining table 2 has a T-slot 21 and a liquid collection tank 22, the T-slot 21 and the liquid collection tank 22 are connected, the bottom of the T-slot 21 is higher than the bottom of the liquid collection tank 22, and the bottom of the liquid collection tank 22 is connected to a drain pipe. During the machining of some workpieces, cutting fluid needs to be sprayed. This cutting fluid flows along the T-slot 21 into the liquid collection tank 22 and is eventually discharged through the drain pipe.

[0037] During operation, the longitudinal drive device 3, the transverse drive device 61 and the vertical drive device 71 drive the electric spindle 10 to move longitudinally, laterally and vertically. The electric spindle 10 drives the tool 101 to rotate and process the workpiece fixed on the processing table 2.

[0038] During tool change, cylinder 94 pushes the third mounting plate 91 towards the second ball screw 612 to its maximum stroke. The second motor 93 drives the tool holder 95 to rotate, moving the unloaded tool position below the tool 101 on the electric spindle 10. After the electric spindle 10 removes the tool 101, the second motor 93 drives the tool holder 95 to rotate again, moving the new tool 101 below the electric spindle 10 for insertion. After the tool change is complete, cylinder 94 drives the third mounting plate 91 to reset, preventing it from occupying space on the machining table 2.

[0039] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A high-precision machine tool, characterized in that, include: The machine frame (1), processing table (2), longitudinal drive device (3), guide rail (4), mounting bracket (5) and gantry frame (6) are fixedly connected to the processing table (2) above the machine frame (1). The longitudinal drive device (3), guide rail (4) and mounting bracket (5) are located below the processing table (2). The guide rail (4) is fixedly connected to the machine frame (1). The mounting bracket (5) is slidably connected to the guide rail (4). The longitudinal drive device (3) is installed on the machine frame (1) and drives the mounting bracket (5) to move longitudinally. The lower end of the support foot of the gantry frame (6) is fixedly connected to the mounting bracket (5).

2. The high-precision machine tool according to claim 1, characterized in that: The longitudinal drive device (3) includes a first ball screw (31), a first nut (32), a bearing seat (33), and a first motor (34). The mounting bracket (5) is fixedly connected to the first nut (32). The two ends of the first ball screw (31) are rotatably connected to the bearing seat (33). The bearing seat (33) is fixedly connected to the frame (1). The first nut (32) is fitted on the outside of the first ball screw (31) and connected to the first ball screw (31). The first motor (34) is fixedly connected to the frame (1) and drives the first ball screw (31) to rotate.

3. A high-precision machine tool according to claim 1, characterized in that: The mounting bracket (5) is slidably connected to multiple guide rails (4), which are arranged in a horizontal straight line and extend longitudinally.

4. A high-precision machine tool according to claim 3, characterized in that: It also includes sliders (51), the mounting bracket (5) is fixedly connected to multiple sliders (51), the sliders (51) are slidably connected to guide rails (4), and the mounting bracket (5) is slidably connected to four guide rails (4) through sliders (51).

5. A high-precision machine tool according to claim 3, characterized in that: It also includes a reinforcing frame (52), which extends laterally and is fixedly connected to the mounting frame (5) below. The reinforcing frame (52) is located between two guide rails (4).

6. A high-precision machine tool according to claim 1, characterized in that: It also includes a first mounting plate (7), a second mounting plate (8), an electric spindle (10), a horizontal drive device (61), and a vertical drive device (71). The first mounting plate (7) is slidably connected to the gantry (6). The horizontal drive device (61) is mounted on the gantry (6) and drives the first mounting plate (7) to move horizontally. The second mounting plate (8) is slidably connected to the first mounting plate (7). The vertical drive device (71) is mounted on the first mounting plate (7) and drives the second mounting plate (8) to move vertically. The electric spindle (10) is fixedly connected to the second mounting plate (8). The electric spindle (10) is connected to the tool (101) and drives the tool (101) to rotate.

7. A high-precision machine tool according to claim 6, characterized in that: It also includes a tool magazine (9), which includes a third mounting plate (91), a reducer (92), a second motor (93), a cylinder (94), and a tool holder (95). The third mounting plate (91) is slidably connected to the legs of the gantry (6). The two ends of the cylinder (94) are fixedly connected to the gantry (6) and the third mounting plate (91) respectively. The cylinder (94) drives the third mounting plate (91) to move laterally. The reducer (92) is fixedly connected to the third mounting plate (91). The output shaft of the reducer (92) is fixedly connected to the tool holder (95). Multiple tools (101) are placed on the tool holder (95).

8. A high-precision machine tool according to claim 6 or 7, characterized in that: The transverse drive device (61) includes a third motor (611), a second ball screw (612), and a second nut. The third motor (611) is fixedly connected to the gantry frame (6). The two ends of the second ball screw (612) are rotatably connected to the gantry frame (6). The third motor (611) drives the second ball screw (612) to rotate. The second ball screw (612) is connected to the second nut. The second nut is fixedly connected to the first mounting plate (7).

9. A high-precision machine tool according to claim 1, characterized in that: A fixing plate (11) is formed on the column of the frame (1), and a fixing hole is formed on the fixing plate (11). The screw passes through the fixing hole and is threaded to the processing table (2).

10. A high-precision machine tool according to claim 1, characterized in that: The processing table (2) has a T-shaped groove (21) and a liquid accumulation tank (22). The T-shaped groove (21) is connected to the liquid accumulation tank (22). The bottom of the T-shaped groove (21) is higher than the bottom of the liquid accumulation tank (22). The bottom of the liquid accumulation tank (22) is connected to the drain pipe.

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