Combined machine tool and machining method thereof

Abstract

The combined machine tool comprises a machine tool body and machining devices arranged on the machine tool body, and the machining devices comprise the first machining device arranged on a first machining station of the machine tool body and the second machining device arranged on a second machining station of the machine tool body. One side of the lathe bed is provided with an overturning conveying device which moves to and fro from a first processing station to a second processing station, the first processing station is provided with a first working table for fixing a workpiece, and the second processing station is provided with a second working table for fixing the workpiece. Automatic overturning and conveying of the workpieces can be achieved through the overturning and conveying device, the machining requirements of the workpieces are met, tedious positioning is not needed, the workpieces are machined in one step, and the machining efficiency of the workpieces is greatly improved.

Description

[0001] This application is a divisional application of application number 202411681332.0, application date 2024-11-22, application title: "A modular machine tool and its processing method". Technical Field

[0002] This invention relates to the field of machine tool technology, and in particular to a modular machine tool and its machining method. Background Technology

[0003] The machining of a workpiece generally involves milling the top and bottom surfaces, milling the sides, and chamfering the edges. In actual production, these three processes are completed by three separate machine tools. After each machining process, the workpiece needs to be manually moved to the next machine tool using an overhead crane. Furthermore, the workpiece must be repositioned after each transfer before processing can begin. The existing machine tools for workpiece machining lack integration, resulting in low processing efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a modular machine tool and its processing method, which reduces the input of technical personnel, improves processing efficiency, and reduces production costs.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a combined machine tool, including a bed and a machining device disposed on the bed, the machining device including a first machining device disposed at a first machining station on the bed, a flipping conveyor device disposed on one side of the bed, and a first worktable for fixing workpieces disposed at the first machining station; the flipping conveyor device includes an X-axis moving mechanism disposed on one side of the machine tool bed, a Y-axis moving mechanism disposed on the X-axis moving mechanism, a Z-axis moving mechanism disposed on the Y-axis moving mechanism, a rotating mechanism disposed on the Z-axis moving mechanism, and a clamping mechanism disposed on the rotating mechanism; the X-axis moving mechanism includes a first slide rail disposed on the bed, a first slide block slidably engaged with the first slide rail, and a first driving assembly for driving the first slide block, the first slide rail being disposed on the side of the bed and arranged along the length direction of the bed; the first worktable includes a rotary table and a partition disposed in the middle of the rotary sleeve, the partition dividing the rotary table into two areas, one area being a loading area and the other area being a machining area, the first machining device being located on one side of the machining area.

[0006] As an improvement, the Y-axis moving mechanism includes a second slide rail mounted on a first slide block, a second slide block slidably engaged with the second slide rail, and a second drive assembly for driving the second slide block; the Z-axis moving mechanism includes a third slide rail mounted on a second slide block, a third slide block slidably engaged with the third slide rail, and a third drive assembly for driving the third slide block; the rotating mechanism includes a rotating shaft pivotally connected to the third slide block, a fourth drive assembly for driving the rotating shaft, and a rotating seat connected to the rotating shaft; the clamping mechanism includes a fourth slide rail mounted on the rotating seat, two chucks slidably engaged with the fourth slide rail, and a hydraulic cylinder for driving the two chucks to move in opposite directions.

[0007] As an improvement, the first processing device includes a dual-spindle milling head and a first drive mechanism for driving the dual-spindle milling head to move up, down, left, and right.

[0008] As an improvement, the rotary table is provided with chip baffles in the loading and processing areas, and a chip removal drive mechanism is provided on the side of the rotary table to drive the chip baffles to move back and forth; the two ends of the chip baffles extend beyond the worktable surface to form an extension, the chip removal drive mechanism acts on the extension, the side of the rotary table is provided with a guide component, and the extension is slidably engaged with the guide component; the lower end of the chip baffles is provided with a scraper that fits against the worktable surface, and one side of the chip baffles is provided with several high-pressure nozzles facing the rotary table.

[0009] As an improvement, a second processing device is provided at the second processing station of the bed, and a second worktable for fixing the workpiece is provided at the second processing station. The flipping conveyor travels between the first processing station and the second processing station. The second processing device includes an integrated milling head for milling and chamfering located on both sides of the bed. The integrated milling head for milling and chamfering includes a milling mechanism and a chamfering mechanism. The milling mechanism includes a face milling cutter, a first spindle box, and a first motor for driving the face milling cutter. The chamfering mechanism includes an upper chamfering mechanism and a lower chamfering mechanism.

[0010] As an improvement, the upper chamfering mechanism includes an upper chamfering cutter, a second spindle box, a second motor that drives the upper chamfering cutter to rotate, and a lifting drive mechanism that drives the second spindle box to rise and fall. The lower chamfering mechanism includes a lower chamfering cutter, a third spindle box, and a third motor that drives the lower chamfering cutter to rotate. The upper chamfering cutter is located above the lower chamfering cutter.

[0011] As an improvement, the face milling cutter includes a roughing cutter and a finishing cutter. The finishing cutter is located behind the roughing cutter and protrudes beyond it. The first spindle box is equipped with a finishing spindle connected to the finishing cutter and a roughing spindle connected to the roughing cutter. The finishing spindle and the roughing spindle are linked by a belt or gear and driven by a first motor.

[0012] As an improvement, the second worktable includes a sliding table, a pad block disposed in the middle of the sliding table, and a central pressing cylinder disposed above the pad block. First support cylinders are symmetrically arranged on both sides of the pad block in the length direction, and second support cylinders are symmetrically arranged on both sides of the pad block in the width direction. A first pressing cylinder is disposed above the first support cylinder, and a second pressing cylinder is disposed above the second support cylinder.

[0013] As an improvement, a pad is provided on the sliding table, and a pad block is located in the middle of the pad. The pad block and the pad are an integral structure. The first support cylinder and the second support cylinder are located on the pad. The first support cylinder includes a first oil chamber located on the pad, a first oil seal that cooperates with the first oil chamber, and a first piston rod located in the first oil chamber. The second support cylinder includes a second oil chamber located on the pad, a second oil seal that cooperates with the second oil chamber, and a second piston rod located in the second oil chamber.

[0014] The processing method of the present invention includes the following steps: (1) The top surface of the workpiece on the first worktable is milled using the first machining device. (2) After the top surface of the workpiece is processed, the workpiece is flipped using a flipping conveyor to exchange the positions of the top and bottom surfaces for processing. (3) After the top and bottom surfaces of the workpiece are processed, the workpiece is transported to the second worktable using a flipping conveyor.

[0015] The beneficial effects of this invention compared to the prior art are: By integrating multiple devices with different processing procedures onto the same machine bed, the positions of each processing station are relatively fixed and precise, facilitating accurate workpiece transport. All processing devices share a single machine bed, resulting in a more compact layout that effectively reduces the space occupied by the machine tool and lowers costs. The use of a flip-conveyor device enables automatic flipping and transport of workpieces, meeting their processing needs without the need for cumbersome positioning, achieving a one-step process and greatly improving workpiece processing efficiency. Attached Figure Description

[0016] Figure 1 This is a top view of a modular machine tool.

[0017] Figure 2 This is a 3D view of a modular machine tool.

[0018] Figure 3 This is an end view of the tilting conveyor in conjunction with the bed.

[0019] Figure 4 This is a schematic diagram of a tilting conveyor device.

[0020] Figure 5 This is a front view of the first workbench.

[0021] Figure 6 This is a side view of the first worktable.

[0022] Figure 7 This is a top view of the first workbench.

[0023] Figure 8 This is a schematic diagram of the second processing device.

[0024] Figure 9 This is a top view of an integrated milling head for milling and chamfering.

[0025] Figure 10 This is a side view of an integrated milling head for milling and chamfering.

[0026] Figure 11 This is a schematic diagram of another type of integrated milling head for milling and chamfering.

[0027] Figure 12 This is a top view of a double-sided milling cutter head.

[0028] Figure 13 This is a schematic diagram of the interior of the first spindle box of a double-sided milling cutter.

[0029] Figure 14 This is a schematic diagram of clamping small-sized workpieces on the second worktable.

[0030] Figure 15 A schematic diagram showing the workpiece clamping preset for the length of the second worktable.

[0031] Figure 16 This is a schematic diagram of clamping a workpiece whose width exceeds the preset limit on the second worktable. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] like Figure 1 , 2 As shown, a modular machine tool includes an integrated bed 1, a first processing device 3 located at a first processing station at the front end of the bed 1, and a second processing device 6 located at a second processing station at the rear end of the bed. A flipping conveyor 2 is provided on one side of the bed 1 to move between the first processing station and the second processing station. A first worktable 4 for fixing workpiece 7 is provided at the first processing station, and a second worktable 5 for fixing workpiece 7 is provided at the second processing station.

[0034] like Figures 2 to 4As shown, the flipping conveyor 2 includes an X-axis moving mechanism 21 on one side of the bed 1, a Y-axis moving mechanism 22 on the X-axis moving mechanism 21, a Z-axis moving mechanism 23 on the Y-axis moving mechanism 22, a rotating mechanism 24 on the Z-axis moving mechanism 23, and a clamping mechanism 25 on the rotating mechanism 24. The X-axis moving mechanism 21 includes a first slide rail 211 on the bed 1, a first slide block 212 that slides with the first slide rail 211, and a first drive assembly that drives the first slide block 212. The first slide rail 211 is located on the side of the bed 1 and is arranged along the length of the bed 1. It can integrate various processing devices on the bed 1 and transport workpieces in a continuous operation through the X-axis moving mechanism 21. The first drive assembly includes a first nut on the first slide block 212, a first screw that cooperates with the first nut, and a first motor that drives the first screw. The Y-axis moving mechanism 22 includes a second slide rail 223 mounted on a first slide block 212, a second slide block 222 slidably engaged with the second slide rail 223, and a second drive assembly 221 for driving the second slide block 222. The second drive assembly 221 includes a second nut mounted on the second slide block 222, a second screw engaged with the second nut, and a second motor for driving the second screw. The Z-axis moving mechanism 23 includes a third slide rail 233 mounted on the second slide block 222, a third slide block 232 slidably engaged with the third slide rail 233, and a third drive assembly 231 for driving the third slide block 232. The third drive assembly 231 includes a third nut mounted on the third slide block 232, a third screw engaged with the third nut, and a third motor for driving the second screw. The rotating mechanism 24 includes a rotating shaft pivotally connected to the third slide block 232, a fourth drive assembly for driving the rotating shaft, and a rotating seat 251 connected to the rotating shaft. The fourth drive assembly includes a speed reducer and a fourth motor for driving the speed reducer. The clamping mechanism 25 includes a fourth slide rail 253 mounted on a rotating seat 251, two chucks 252 that slide in cooperation with the fourth slide rail 253, and a hydraulic cylinder that drives the two chucks 252 to move in opposite directions. The two chucks 252 move synchronously and have a centering function, which can center and clamp the workpiece 7 for more accurate positioning. When workpiece 7 is being processed, the chuck is positioned on one side of the bed 1, away from the processing area, so it does not interfere with the processing of workpiece 7. When it is necessary to flip the workpiece, the X-axis moving mechanism 21 does not move, while the Y-axis moving mechanism 22 moves and drives the Z-axis moving mechanism 23 and the clamping mechanism 25 to move towards the workpiece. The clamping mechanism 25 flips the workpiece 7 with the same cooperation of the Y-axis moving mechanism 22, the Z-axis moving mechanism 23 and the rotating mechanism 24. For example, the workpiece 7 is flipped 180 degrees, so that the bottom surface is flipped to the processing position. After the workpiece 7 is processed, the clamping mechanism 25 can clamp the workpiece 7 again and transport it to the next station through the X-axis moving mechanism 21. Using a robot for clamping and transport can reduce the secondary positioning work of workpiece 7, facilitate automated processing and production, and help improve production efficiency.

[0035] like Figure 1 , 3 As shown, the first machining device 3 includes a crossbeam frame 31, a dual-spindle milling head 32, and a first drive mechanism 33 for driving the dual-spindle milling head 32 to move up, down, left, and right. The crossbeam frame 31 is fixed to one side of the bed 1 and is arranged opposite to the flipping conveyor 2. The first worktable 4 is located between the first machining device 3 and the flipping conveyor 2. The dual-spindle milling head 32 has two parallel and vertically arranged spindles. A roughing cutter head is installed at the lower end of one spindle, and a finishing cutter head is installed at the lower end of the other spindle. The milling head can mill the top surface of the workpiece fixed on the first worktable. Moreover, the roughing cutter head and the finishing cutter head are integrated together to improve the milling efficiency of the milling head. After the surface of the workpiece 7 on the first worktable 4 is machined, the workpiece can be flipped 180 degrees by the flipping conveyor 2 to complete the milling process of the top and bottom surfaces of the workpiece 7.

[0036] like Figures 5 to 7As shown, the first worktable 4 includes a rotary table 41 and a partition disposed in the middle of the rotary table 41; the partition divides the rotary table 41 into two areas, one area being a loading area and the other area being a processing area. The flipping conveyor is located on one side of the loading area, and the first processing device 3 is located on one side of the processing area. Chip baffles 42 are provided in the loading area and the processing area of ​​the rotary table 41, and a chip removal drive mechanism 43 for driving the chip baffles 42 to move back and forth is provided on one side of the rotary table 41; the partition can also be composed of two back-to-back chip baffles 42. The left and right ends of the chip baffle 42 extend out of the rotary table 41 to form an extension portion 421. The extension portion 421 is bent into an L-shape to enhance its structural strength. The lower end of the extension portion 421 extends downward to the side of the rotary table 41. The chip removal drive mechanism 43 acts on the extension portion 421. The side of the rotary table 41 is also provided with a guide component 46. The groove or slider on the extension portion 421 slides in cooperation with the guide component 46, which can improve the stability of the movement of the chip baffle 42. The lower end of the chip baffle 42 is bent into an L-shape to improve the structural strength of the chip baffle 42. The L-shaped portion is provided with a scraper 45 that fits against the surface of the rotary table 41 and several high-pressure nozzles 44 arranged in a line above the scraper 45. The scraper 45 is locked to the chip baffle 42 with screws. In this embodiment, the surface of the rotary table 41 is flat, and the workpiece is fixed to the surface of the rotary table 41 by magnetic attraction. The chip removal drive mechanism 43 is a cylinder, hydraulic cylinder, gear rack, or lead screw and nut mechanism. In this embodiment, a cylinder is used as the drive cylinder. The chip removal drive mechanisms 43 corresponding to the two chip baffles are located on both sides of the rotary table, driving the two chip baffles 42 to move in opposite directions. The initial position of the chip baffles 42 is in the middle of the rotary table 41. The loading area of ​​the rotary table 41 corresponds to the flipping conveyor. The dual spindle milling head 32 is located above the processing area. The workpiece 7 is loaded onto the loading area of ​​the rotary table 41 by manual or robotic arms for processing. After the workpiece in the processing area is processed, the rotary table rotates 180 degrees, transferring the processed workpiece to the loading area and the workpiece to be processed to the processing area. The flipping conveyor flips the workpiece 7, which has completed the top surface processing, 180 degrees. At the same time as flipping, the chip baffles 42 move outward to clean the iron chips on the rotary table 41. After the iron chips are cleaned, the flipping conveyor places the workpiece back onto the loading area of ​​the rotary table 41.

[0037] like Figures 8 to 11As shown, the second machining device 6 includes integrated milling and chamfering heads 61 located on both sides of the machine bed. These integrated milling and chamfering heads 61 can simultaneously perform milling and chamfering on the workpiece 7. Each integrated milling and chamfering head 61 includes a milling mechanism 611 and a chamfering mechanism 612. The milling mechanism 611 includes a face milling cutter 6111, a first spindle box 6112, a first motor driving the face milling cutter 6111, and a feed mechanism driving the first spindle box 6112 to move back and forth. The first motor drives the face milling cutter 6111 to rotate by driving the spindle inside the first spindle box 6112. The feed mechanism uses a lead screw and nut mechanism. Figure 12 , 13 As shown, in this embodiment, two face milling cutters can be configured, including a roughing cutter 6113 and a finishing cutter 6114. The finishing cutter 6114 is located behind the roughing cutter 6113 and protrudes forward from it. The first face milling cutter is responsible for rough milling the plane, removing most of the machining allowance, while the second face milling cutter is responsible for finishing milling the plane. During operation, the roughing cutter 6113 processes first, followed by the finishing cutter 6114, allowing both roughing and finishing to be completed in one operation. The first spindle box 6112 is equipped with a tool corresponding to the finishing cutter 6113. A fine milling spindle 6117 connected to a fine milling cutter 6113 and a rough milling spindle 6116 connected to a rough milling cutter 6113 are connected. The fine milling spindle 6117 and the rough milling spindle 6116 are linked by a belt 6119 and driven by a first motor 6115. The first motor 6115 is directly connected to the fine milling spindle 6117 via a pulley coupling assembly 6118. The spindle speed is high, suitable for fine milling of planes. The first motor 6115 is connected to the rough milling spindle 6116 via a synchronous pulley 6110 for speed reduction transmission, increasing the output torque of the rough milling spindle 6116, suitable for heavy rough milling of planes. Figures 9 to 11As shown, the chamfering mechanism 612 includes an upper chamfering mechanism and a lower chamfering mechanism. When there is only one face milling cutter, the upper and lower chamfering mechanisms are located behind the face milling cutter. When there are two face milling cutters, the upper and lower chamfering cutters are located between the roughing cutter 6113 and the finishing cutter 6114. The upper chamfering mechanism includes an upper chamfering cutter 6121, a second spindle box 6122, a second motor that drives the upper chamfering cutter 6121 to rotate, and a drive mechanism 6123 that drives the second spindle box 6122 to rise and fall. The drive mechanism 6123 includes a sliding component located between the second spindle box 6122 and the first spindle box 6112, and a component connected to the second spindle box 6122. The system includes a nut seat, a lead screw that mates with the nut seat, and a fourth motor that drives the lead screw. The lower chamfering mechanism includes a lower chamfering cutter 6124, a third spindle box 6125, and a third motor that drives the lower chamfering cutter 6124 to rotate. The upper and lower chamfering mechanisms are mounted on the first spindle box 6112. The upper chamfering cutter 6121, the lower chamfering cutter 6124, and the face milling cutter 6111 are fed synchronously. After the position of the workpiece 7 is determined, milling and chamfering can be performed in one operation. The upper chamfering cutter 6121 is located above the lower chamfering cutter 6124. The upper chamfering cutter 6121 can be configured to be horizontal or vertical. The upper and lower chamfering cutters 6124 can simultaneously chamfer the upper and lower edges of the workpiece 7. By integrating the milling cutter and the chamfering cutter together, the workpiece 7 can be chamfered while being milled. The two different processes are completed in one go, shortening the process flow and improving processing efficiency. The lower chamfering cutter 6124 is fixed in position, while the position of the upper chamfering cutter 6121 can be adjusted up and down according to the thickness of the workpiece 7.

[0038] like Figures 14 to 16As shown, the second worktable 5 is positioned between two integrated milling heads 61 for milling and chamfering. The second worktable 5 includes a sliding table 50, a pad 54 located in the middle of the sliding table 50, and a central clamping cylinder 52 located above the pad 54. The positions of the pad 54 and the central clamping cylinder 52 correspond. First support cylinders 55 are symmetrically arranged on both sides of the pad 54 along its length. Second support cylinders 57 are symmetrically arranged on both sides of the square width of the pad 54. When the piston rods of the first support cylinders 55 and the second support cylinders 57 extend to their maximum stroke, the top of the piston rods is at the same height as the pad 54. A first clamping cylinder 56 is correspondingly located above the first support cylinder 55, and a second clamping cylinder 58 is correspondingly located above the second support cylinder 57. The support cylinders and clamping cylinders cooperate to clamp the workpiece. The sliding table 50 is provided with a pad 51, and a pad block 54 is located in the middle of the pad 51. The pad block 54 and the pad 51 are either an integral structure or separate structures. The first support cylinder 55 and the second support cylinder 57 are provided on the pad 51. The first support cylinder 55 includes a first oil chamber provided on the pad 51, a first oil seal cooperating with the first oil chamber, and a first piston rod provided in the first oil chamber. The second support cylinder 57 includes a second oil chamber provided on the pad 51, a second oil seal cooperating with the second oil chamber, and a second piston rod provided in the second oil chamber. The sliding table 50 is connected to the bed via a slide rail. When the sliding table 50 is loaded, it slides out of the working area of ​​the second processing device 6. The flipping conveyor 2 can transport the workpiece processed by the first processing device 3 along the X-axis moving mechanism 21 to the sliding table 50 of the second worktable 5. After the second worktable 5 has fixed the workpiece 7, the sliding table 50 slides into the working area of ​​the second processing device 6 with the workpiece 7. The second workbench 5 is used to replace the manual addition or removal of the leveling blocks 54. After the workpiece dimensions are input into the system, the system automatically calculates and determines whether leveling blocks are needed. When processing small workpieces, only the center block 54 and the center clamping cylinder 52 are used to clamp the workpiece. When the length of the workpiece exceeds the preset workpiece length, the system automatically energizes the solenoid valve of the hydraulic station, supplying hydraulic oil to the first support cylinder 55 and the first clamping cylinder 56 in the front-to-back direction. The piston rods of the two first support cylinders 55 extend to the same height as the block 54 and support the workpiece, while the two corresponding first clamping cylinders 56 extend and clamp the workpiece. When the width of the workpiece exceeds the preset workpiece width, the system automatically energizes the solenoid valve of the hydraulic station, supplying hydraulic oil to the second support cylinder 57 and the second clamping cylinder 58 in the left-to-right direction. The piston rods of the two second support cylinders 57 extend to the same height as the block 54 and support the workpiece, while the two corresponding second clamping cylinders 58 extend and clamp the workpiece.

[0039] The processing method of the modular machine tool of the present invention includes the following steps: (1) The top surface of the workpiece on the first worktable is milled using the first machining device. (2) After the top surface of the workpiece is processed, the workpiece is flipped using a flipping conveyor to exchange the positions of the top and bottom surfaces for processing. (3) After the top and bottom surfaces of the workpiece are processed, the workpiece is transported to the second worktable using a flipping conveyor. (4) Use the second worktable to clamp the workpiece, and after clamping, transport it between the two milling heads for chamfering the milling surfaces; (5) Milling the four sides of the workpiece using a milling mechanism, and simultaneously chamfering the edges of the workpiece using a chamfering mechanism. (6) Complete the milling of the six faces of the workpiece and the chamfering of the four sides.

[0040] The principle of this invention is as follows: Multiple devices with different processing steps are integrated onto a single machine bed. The positions of each processing station are relatively fixed and precise, facilitating accurate workpiece transport. All processing devices share a single machine bed, resulting in a more compact layout, effectively reducing the space occupied by the machine tool and lowering costs. The use of a flip-conveyor device enables automatic flipping and transport of workpieces, meeting processing requirements without the need for cumbersome positioning, achieving a one-step process and significantly improving processing efficiency. The flip-conveyor device automatically connects the various processing devices, eliminating the need for technical personnel intervention, reducing manpower input, and avoiding processing errors caused by human error.

Claims

1. A modular machine tool, comprising a bed and a machining device mounted on the bed, characterized in that: The processing device includes a first processing device located at the first processing station of the bed. A flipping conveyor device for flipping the workpiece is provided on one side of the bed. A first worktable for fixing the workpiece is provided at the first processing station. The first worktable includes a rotary table and a partition located in the middle of the rotary sleeve. The partition divides the rotary table into two areas, one of which is a loading area and the other is a processing area. The first processing device is located on one side of the processing area.

2. The modular machine tool according to claim 1, characterized in that: The flipping and conveying device includes an X-axis moving mechanism on one side of the machine tool bed, a Y-axis moving mechanism on the X-axis moving mechanism, a Z-axis moving mechanism on the Y-axis moving mechanism, a rotating mechanism on the Z-axis moving mechanism, and a clamping mechanism on the rotating mechanism. The X-axis moving mechanism includes a first slide rail on the bed, a first slide block slidably engaged with the first slide rail, and a first drive assembly for driving the first slide block. The first slide rail is located on the side of the bed and is arranged along the length of the bed. The Y-axis moving mechanism includes a second slide rail on the first slide block, a second slide block slidably engaged with the second slide rail, and a second drive assembly for driving the second slide block. The Z-axis moving mechanism includes a third slide rail on the second slide block, a third slide block slidably engaged with the third slide rail, and a third drive assembly for driving the third slide block. The rotating mechanism includes a rotating shaft pivotally connected to the third slide block, a fourth drive assembly for driving the rotating shaft, and a rotating seat connected to the rotating shaft. The clamping mechanism includes a fourth slide rail on the rotating seat, two chucks slidably engaged with the fourth slide rail, and a hydraulic cylinder for driving the two chucks to move in opposite directions.

3. A modular machine tool according to claim 1, characterized in that: The first processing device includes a dual-spindle milling head and a first drive mechanism that drives the dual-spindle milling head to move up, down, left, and right.

4. A modular machine tool according to claim 1, characterized in that: The rotary table has chip baffles in its loading and processing areas. A chip removal drive mechanism is provided on the side of the rotary table to drive the chip baffles to move back and forth. The chip baffles extend beyond the worktable surface at both ends to form extensions. The chip removal drive mechanism acts on the extensions. A guide component is provided on the side of the rotary table, and the extensions slide in cooperation with the guide component. A scraper is provided at the lower end of the chip baffles to fit against the worktable surface. Several high-pressure nozzles facing the rotary table are provided on one side of the chip baffles.

5. A modular machine tool according to claim 1, characterized in that: The second machining station of the bed is provided with a second machining device, and the second machining station is provided with a second worktable for fixing workpieces. The flipping conveyor travels between the first machining station and the second machining station. The second machining device includes an integrated milling head for milling and chamfering located on both sides of the bed. The integrated milling head for milling and chamfering includes a milling mechanism and a chamfering mechanism. The milling mechanism includes a face milling cutter, a first spindle box, and a first motor for driving the face milling cutter. The chamfering mechanism includes an upper chamfering mechanism and a lower chamfering mechanism.

6. A modular machine tool according to claim 5, characterized in that: The upper chamfering mechanism includes an upper chamfering cutter, a second spindle box, a second motor that drives the upper chamfering cutter to rotate, and a lifting drive mechanism that drives the second spindle box to rise and fall. The lower chamfering mechanism includes a lower chamfering cutter, a third spindle box, and a third motor that drives the lower chamfering cutter to rotate. The upper chamfering cutter is located above the lower chamfering cutter.

7. A modular machine tool according to claim 6, characterized in that: The face milling cutter includes a roughing cutter and a finishing cutter. The finishing cutter is located behind the roughing cutter and protrudes beyond it. The first spindle box contains a finishing spindle connected to the finishing cutter and a roughing spindle connected to the roughing cutter. The finishing spindle and the roughing spindle are linked by a belt or gear and driven by a first motor.

8. A modular machine tool according to claim 5, characterized in that: The second worktable includes a sliding table, a pad block disposed in the middle of the sliding table, and a central pressing cylinder disposed above the pad block. First support cylinders are symmetrically arranged on both sides of the pad block in the length direction, and second support cylinders are symmetrically arranged on both sides of the pad block in the width direction. A first pressing cylinder is disposed above the first support cylinder, and a second pressing cylinder is disposed above the second support cylinder.

9. A modular machine tool according to claim 8, characterized in that: A pad is provided on the sliding platform, and a pad block is located in the middle of the pad. The pad block and the pad are integrally formed. The first support cylinder and the second support cylinder are located on the pad. The first support cylinder includes a first oil chamber located on the pad, a first oil seal that cooperates with the first oil chamber, and a first piston rod located in the first oil chamber. The second support cylinder includes a second oil chamber located on the pad, a second oil seal that cooperates with the second oil chamber, and a second piston rod located in the second oil chamber.

10. A machining method for the combined machine tool as described in claim 1, characterized in that, Includes the following steps: (1) The top surface of the workpiece on the first worktable is milled using the first machining device. (2) After the top surface of the workpiece is processed, the workpiece is flipped using a flipping conveyor to exchange the positions of the top and bottom surfaces for processing. (3) After the top and bottom surfaces of the workpiece are processed, the workpiece is transported to the second worktable using a flipping conveyor.

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