Numerical control four-spindle heavy cutting machine

Abstract

The invention provides a numerical control four-spindle heavy cutting machine. The numerical control four-spindle heavy cutting machine comprises a supporting base; the movable working platform mechanism is mounted on the supporting base; the cutting main shaft mechanism is mounted on the supporting base and is positioned above the movable working platform mechanism; the chain tool magazine mechanism is installed on the supporting base and located behind the movable working platform mechanism, the chain tool magazine mechanism comprises a movable base, a plurality of chain tool magazine devices which are distributed in parallel at intervals and correspond to the cutting main shaft assemblies are installed on the movable base, and a tool magazine Y-direction driving assembly is installed at the bottom of the movable base. According to the numerical control four-spindle heavy cutting machine, through the structural design of the supporting base, the movable working platform mechanism, the spindle mounting structure and the tool magazine, the machining precision and the machining efficiency of the numerical control four-spindle heavy cutting machine can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machine tool equipment, and particularly relates to a numerically controlled four-spindle heavy cutting machine. Background Art

[0002] Heavy cutting machines are industrial equipment designed specifically for machining large, high-hardness or complex workpieces. Their characteristics are mainly reflected in the following aspects: (1) High structural rigidity: Heavy bed: Made of cast iron, cast steel or welded steel structure, with extremely high vibration resistance and stability, ensuring no deformation during machining. (2) Large-size machining capacity: The workbench size can reach several meters to dozens of meters, suitable for machining large workpieces. The workbench load-bearing capacity can reach dozens of tons, meeting the clamping requirements of heavy workpieces. (3) High cutting ability, supporting large feed rates and large cutting depths, capable of quickly removing materials and machining high-hardness materials. (4) High precision and stability, using linear guides, hydrostatic guides or roller guides, combined with high-rigidity spindles, ensuring micron-level machining accuracy. The core advantages of heavy cutting machines lie in heavy load, high efficiency and high precision, suitable for machining large key components.

[0003] The existing heavy cutting machines mainly have the following defects: (1) It is very difficult for heavy cutting machines to pair multiple spindles for independent machining because movement interference will occur during the machining process of multiple spindles, which will in turn affect the machining accuracy; (2) The existing chain-type tool magazine has a large tool magazine capacity, but its structure is complex. Especially during the operation of the chain tool magazine, since the chain will become loose during long-term use, it is easy to have inaccurate positioning, which may in turn cause spindle tool grasping failure or damage; (3) In order to enhance the strength, the support base of the existing heavy cutting machine generally uses cast iron or cast steel structure. If a solid cast iron or cast steel structure is used, although the strength of the base can be enhanced, it will not only make the base very heavy, but also greatly increase the equipment cost; (4) The stress borne by the workbench surface is large, and the workbench is prone to bending, deformation and other conditions. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a numerically controlled four-spindle heavy cutting machine. Through the structural design of the support base, moving work platform mechanism, spindle mounting structure and tool magazine, the machining accuracy and machining efficiency of the numerically controlled four-spindle heavy cutting machine can be greatly improved.

[0005] To achieve the above technical solution, the present invention provides a numerically controlled four-spindle heavy cutting machine, including: a support base; a moving work platform mechanism installed on the support base, the moving work platform mechanism includes Y-direction guide rails installed on the support base in parallel at intervals, a Y-direction moving plate is installed on the Y-direction guide rails, X-direction guide rails are installed on the Y-direction moving plate in parallel at intervals, a workbench is installed on the X-direction guide rails, a Y-direction driving module is installed on the support base and connected to the Y-direction moving plate, and an X-direction driving module is installed on the Y-direction moving plate and connected to the workbench; a cutting spindle mechanism installed on the support base and above the moving work platform mechanism, the cutting spindle mechanism includes a gantry frame, a Z-axis hanging plate is installed on the gantry frame, and a plurality of independently arranged cutting spindle assemblies are installed on the Z-axis hanging plate, the cutting spindle assembly includes two Z-axis guide rails installed on the Z-axis hanging plate in parallel at intervals and extending along the Z direction, a Z-axis linear module is fixed on the Z-axis guide rails, a Z-axis driving motor is installed on the top of the Z-axis hanging plate and connected to the Z-axis linear module, and a spindle cutting module is installed on the Z-axis linear module; a chain tool magazine mechanism installed on the support base and behind the moving work platform mechanism, the chain tool magazine mechanism includes a moving base, a plurality of chain tool magazine devices installed on the moving base in parallel at intervals and corresponding to the cutting spindle assemblies are installed on the moving base, and a tool magazine Y-direction driving component is installed at the bottom of the moving base.

[0006] Preferably, each chain tool magazine device includes an independent frame, the frame is fixed on the moving base, two sprockets are installed at the front and rear ends of the frame in parallel at intervals, one of the sprockets is connected to a chain driving component, the two sprockets are connected by an annular chain, a lower annular guide strip is installed on the outer periphery below the annular chain on the frame, a plurality of uniformly spaced tool claw assemblies are installed on the annular chain, the tool claw assembly includes a tool claw seat, the tool claw seat is fixed on the chain, an upper guide bearing is installed at the rear end of the tool claw seat, two symmetrically distributed clamping arms are fixed on the tool claw seat by a rotating pin shaft, a strong spring is installed between the rear ends of the two clamping arms, a guide strip docking block is installed below the tool claw seat, the guide strip docking block is inserted into the lower annular guide strip located below the annular chain, an upper guide cover covers the upper part of the frame, an annular guide groove is arranged in the upper guide cover, and the upper guide bearings arranged on each tool claw assembly are embedded in the annular guide groove arranged in the upper guide cover.

[0007] Preferably, the moving base includes a moving base body, a guide rail limit docking strip for connecting with a guide rail is installed at the bottom of the moving base body, a lead screw mounting seat connected to a lead screw is also installed at the center of the bottom of the moving base body, a lead screw for driving the moving base body to move is installed along the Y direction on the lead screw mounting seat, and the lead screw is connected to the tool magazine Y-direction driving component.

[0008] Preferably, the chain drive assembly includes a chain drive motor and a planetary reducer. The planetary reducer is installed below the sprocket and connected to the sprocket, and the chain drive motor is connected to the planetary reducer.

[0009] Preferably, a proximity switch mounting seat is installed on one side of the front end of the annular chain on the frame. A proximity switch corresponding to the claw assembly is installed on the proximity switch mounting seat, and a chain adjusting block for adjusting the chain tension is also installed on the frame.

[0010] Preferably, the main spindle cutting module includes a main spindle box. The main spindle box is fixed on the Z-axis linear module. The main spindle body is installed on the main spindle box along the Z direction and is downward. The main spindle drive motor is installed on the top of the main spindle box and connected to the main spindle body, and a tool changing chuck is installed at the bottom of the main spindle body.

[0011] Preferably, the support base includes a base body. The base body includes a bottom frame and an irregular support surface integrally provided on the top of the bottom frame. The support surface includes a flat surface at the center of the top of the bottom frame. The flat surface is connected to the bottom frame through a vertical reinforcing rib provided below the center of the bottom of the flat surface. On both the left and right sides of the flat surface, there are upwardly convex surfaces. On the other side of the convex surface, there is an obliquely downwardly arranged inclined surface. On the other side of the inclined surface, there is an arc-shaped connecting surface. On the other side of the arc-shaped connecting surface, there is an obliquely upwardly arranged inclined surface. The other end of the obliquely upwardly arranged inclined surface is connected to the end edge of the bottom frame. The top of the first diagonal reinforcing rib is connected to the bottom surface at the butt joint of the flat surface and the convex surface, and the bottom surface of the first diagonal reinforcing rib is connected to the bottom frame. The top of the second diagonal reinforcing rib is connected to the center of the top of the inclined surface, and the bottom of the second diagonal reinforcing rib is connected to the bottom frame. The top of the third diagonal reinforcing rib is connected to the bottom surface at the butt joint of the arc-shaped connecting surface and the obliquely upwardly arranged inclined surface, and the bottom of the third diagonal reinforcing rib is connected to the bottom frame. A plurality of hollow holes are provided in the base body.

[0012] Preferably, a Y-axis guide rail mounting groove is provided along the Y direction on the convex surface of the base body. A guide rod mounting seat and a limit block are installed on the flat surface of the base body. A Y-axis rod mounting groove is provided along the Y direction on the arc-shaped connecting surface of the base body. Gantry support blocks are provided at the upper left and upper right corners of the base body.

[0013] Preferably, the workbench includes a workbench body, and a reinforcing support base plate is installed at the bottom of the workbench body. The reinforcing support base plate includes a bottom frame, and a plurality of reinforcing blocks are installed in the bottom frame and distributed in a matrix. A plurality of reinforcing rib connecting rings are arranged between the reinforcing blocks. The adjacent reinforcing rib connecting rings and reinforcing blocks, adjacent reinforcing blocks and reinforcing blocks, adjacent reinforcing rib connecting rings and reinforcing rib connecting rings, adjacent reinforcing rib connecting rings and the bottom frame, and adjacent reinforcing blocks and the bottom frame are all connected by reinforcing ribs distributed in a "rice" shape.

[0014] Preferably, a plurality of parallel and spaced T-shaped grooves are provided on the top surface of the workbench. The bottom frame of the reinforcing support base plate is welded to the bottom surface of the workbench. A plurality of lower alignment fixing screw holes are provided on each reinforcing block, and upper alignment fixing screw holes corresponding to the lower alignment fixing screw holes are provided on the top surface of the workbench. After the upper alignment fixing screw holes and the lower alignment fixing screw holes are aligned, they are fastened by screws.

[0015] The beneficial effects of a numerically controlled four-spindle heavy cutting machine provided by the invention are as follows:

[0016] (1) Through the design of the spindle installation structure and the moving work platform mechanism structure of the present invention, only the movement of a plurality of spindles in the Z-axis direction is borne on the gantry frame where the spindles are installed, and no movement in the X-axis direction is performed. The X-axis and Y-axis movements of the workpiece are driven by the moving work platform mechanism, which is beneficial to improving the stability of the spindle during processing and the stability of the workpiece movement, reducing the resonance generated during multi-axis simultaneous heavy cutting processing, and thus ensuring the processing accuracy.

[0017] (2) Through the design of the structure of the chain tool magazine mechanism of the present invention, four independent and parallel and spaced chain tool magazine devices are adopted on the same moving base. Each chain tool magazine device can provide a tool magazine for one spindle. The overall tool magazine adopts a chain structure, which not only makes the structural layout of the tool magazine more compact, but also greatly increases the capacity of the tool magazine, and can meet the tool change requirements for the simultaneous independent processing of the four-spindle heavy cutting machine.

[0018] (3) Through the design of the structure of the tool claw assembly of the present invention, a tool claw structure with elastic double arms for automatic opening and closing is adopted. During actual work, the tool can be clamped by using a strong spring installed between the rear ends of the two clamping arms to push the clamping arms. When the spindle takes the tool, only the thrust of the strong spring needs to be overcome to take the tool out of the clamping arm, which not only simplifies the structure of the tool claw, but also greatly facilitates the tool loading and tool taking operations.

[0019] (4) Through the structural design of the upper and lower guiding of the tool magazine, the upper part of the tool magazine is limited by embedding the upper guiding bearings set on each tool claw assembly into the annular guiding grooves set on the upper guiding cover. The lower part of the tool magazine is limited by inserting the guiding bar docking blocks set on each tool claw assembly into the lower annular guiding bar located below the annular chain. This will limit all directions when the chain drives the movement of each tool claw assembly. Even if the chain loosens during use, it will not affect the positioning accuracy of each tool claw assembly, thereby improving the operating accuracy of the entire tool magazine.

[0020] (5) Through the structural design of the support base, by setting the top surface of the base body as an irregular support surface, which consists of a flat straight surface, a convex surface, an inclined lower surface, an arc connecting surface, and an inclined upper surface, to meet the installation requirements of components such as the gantry, moving workbench, and tool magazine of a heavy-duty cutting machine. And according to the force conditions of different surfaces, vertical reinforcing ribs, first diagonal reinforcing ribs, second diagonal reinforcing ribs, third diagonal reinforcing ribs, etc. are set, so that there is an included angle between the internal reinforcing ribs of the base body and the support surface, presenting a triangular stable structure. Moreover, the staggered reinforcing ribs can enhance the strength of the support surface. At the same time, by setting hollow holes in the base body, the weight of the base can be effectively reduced, and combined with the structural design of the reinforcing ribs, the strength and stability of the base can be maximally guaranteed while reducing the weight.

[0021] (6) Through the structural design of the workbench, by installing a reinforced support bottom plate at the bottom of the workbench to enhance the support strength of the workbench, and through the structural design of the reinforced support bottom plate, by connecting the adjacent reinforcing rib connecting rings and reinforcing blocks, adjacent reinforcing blocks and reinforcing blocks, adjacent reinforcing rib connecting rings and reinforcing rib connecting rings, adjacent reinforcing rib connecting rings and the bottom frame, adjacent reinforcing blocks and the bottom frame with reinforcing ribs distributed in a "rice" shape, it can cope with different load changes on the workbench surface, making the stress on the workbench surface evenly distributed, thereby enhancing the overall rigidity of the workbench, and further meeting the rigidity requirements when the four spindles of a four-spindle heavy-duty cutting machine perform heavy-duty cutting operations simultaneously. Brief Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0023] Figure 2 is a three-dimensional structural schematic diagram of the support base in the present invention.

[0024] Figure 3 is a top view of the support base in the present invention.

[0025] Figure 4 is a cross-sectional view of the support base in the present invention.

[0026] Figure 5 This is the three-dimensional installation structure diagram of the mobile working platform mechanism in the present invention.

[0027] Figure 6 This is the top view of the three-dimensional structure of the workbench in the present invention.

[0028] Figure 7 This is the bottom view of the three-dimensional structure of the workbench in the present invention.

[0029] Figure 8 This is the front view of the cutting spindle mechanism in the present invention.

[0030] Figure 9 This is the side view of the cutting spindle mechanism in the present invention.

[0031] Figure 10 This is the sectional view of the cutting spindle mechanism in the present invention.

[0032] Figure 11 This is the three-dimensional structure diagram of the chain tool magazine mechanism in the present invention.

[0033] Figure 12 This is the front view of the chain tool magazine mechanism in the present invention.

[0034] Figure 13 This is the three-dimensional structure diagram of the chain tool magazine device in the present invention.

[0035] Figure 14 This is the top view of the chain tool magazine device in the present invention.

[0036] Figure 15 This is the top view of the chain tool magazine device after removing the upper guide cover in the present invention.

[0037] Figure 16 This is the side view of the chain tool magazine device in the present invention.

[0038] Figure 17 This is the sectional view of the chain tool magazine device in the present invention.

[0039] Figure 18 This is the local structure installation diagram of the chain tool magazine device in the present invention.

[0040] In the figure: 100, support base; 101, base body; 1101, bottom frame; 1102, flat surface; 1103, convex surface; 1104, inclined lower surface; 1105, arc connecting surface; 1106, inclined upper surface; 1107, vertical reinforcing rib; 1108, first inclined reinforcing rib; 1109, second inclined reinforcing rib; 1110, third inclined reinforcing rib; 1111, hollow hole; 102, convex part; 103, Y-direction guide rail installation groove; 104, gantry support block; 105, guide rod installation seat; 106, limit block; 107, Y-direction lead screw installation groove; 108, end edge limit block; 109, motor installation block; 110, base installation groove;

[0041] 200, mobile working platform mechanism; 210, workbench; 211, reinforced support bottom plate; 212, workbench body; 213, T-shaped groove; 214, reinforcing block; 215, reinforcing rib connection ring; 216, reinforcing rib; 217, center hole; 218, limit installation block; 219, lower alignment fixing screw hole; 2110, upper alignment fixing screw hole; 220, Y-direction moving plate; 230, X-direction guide rail; 240, X-direction driving module; 250, Y-direction guide rail; 260, Y-direction driving module;

[0042] 300, cutting spindle mechanism; 310, gantry frame; 320, Z-axis hanging plate; 330, cutting spindle assembly; 331, Z-axis guide rail; 332, Z-axis linear module; 333, Z-axis driving motor; 334, Z-axis limit block; 335, spindle cutting module; 3351, spindle box; 3352, spindle driving motor; 3353, spindle body; 3354, tool change chuck;

[0043] 400, chain tool magazine mechanism; 410, moving base; 411, moving base body; 412, guide rail limit docking strip; 413, lead screw installation seat; 420, chain tool magazine device; 421, frame; 422, chain driving assembly; 4221, chain driving motor; 4222, planetary reducer; 4223, sprocket; 423, tool claw assembly; 4231, tool claw seat; 4232, upper guide bearing; 4233, clamping arm; 4234, rotating pin shaft; 4235, strong spring; 4236, guide strip docking block; 424, chain; 425, lower annular guide strip; 426, proximity switch installation seat; 427, proximity switch; 428, tool; 429, chain adjustment block; 4210, upper guide cover. Specific implementation method

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment: A numerically controlled four-spindle heavy cutting machine.

[0046] Referring to Figures 1 to 18 As shown, a numerically controlled four-spindle heavy cutting machine includes:

[0047] A support base 100 (referring to Figures 2 to 4As shown, the support base 100 includes a base body 101. The base body 101 includes a bottom frame 1101 and an irregular support surface integrally provided on the top of the bottom frame 1101. The support surface includes a flat surface 1102 located at the center of the top of the bottom frame 1101. A guide rod mounting seat 105 and a limit block 106 are installed on the flat surface 1102. The guide rod mounting seat 105 is used to dock with the guide rod of the mobile work platform mechanism 200. The guide rod is used to regulate the movement of the mobile work platform mechanism 200 in the Y direction. The flat surface 1102 is connected to the bottom frame 1101 through a vertical reinforcing rib 1107 provided below the center of the bottom of the flat surface 1102. On both the left and right sides of the flat surface 1102, there are upwardly convex surfaces 1103. A Y-direction guide rail mounting groove 103 is provided along the Y direction on the convex surface 1103 to facilitate the docking of the base body 101 with the mobile work platform mechanism 200. On the other side of the convex surface 1103, there is an obliquely downwardly provided inclined lower surface 1104. On the other side of the inclined lower surface 1104, there is an arc-shaped connecting surface 1105. A Y-direction lead screw mounting groove 107 is provided along the Y direction on the arc-shaped connecting surface 1105. An end-edge limit block 108 is installed on the edge of the Y-direction lead screw mounting groove 107. The Y-direction lead screw mounting groove 107 is used to install the Y-direction drive shaft for driving the mobile platform. A motor mounting block 109 is installed at the front end of the Y-direction lead screw mounting groove 107. On the other side of the arc-shaped connecting surface 1105, there is an obliquely upward surface 1106. The other end of the obliquely upward surface 1106 is connected to the edge of the bottom frame 1101. The top of the first oblique reinforcing rib 1108 is connected to the bottom surface at the docking position of the flat surface 1102 and the convex surface 1103, and the bottom surface of the first oblique reinforcing rib 1108 is connected to the bottom frame 1101. The top of the second oblique reinforcing rib 1109 is connected to the center of the top of the inclined lower surface 1104, and the bottom of the second oblique reinforcing rib 1109 is connected to the bottom frame 1101. The top of the third oblique reinforcing rib 1110 is connected to the bottom surface at the docking position of the arc-shaped connecting surface 1105 and the obliquely upward surface 1106, and the bottom of the third oblique reinforcing rib 1110 is connected to the bottom frame 1101. A plurality of hollow holes 1111 are provided inside the base body 101. Gantry support blocks 104 are provided at the upper left and upper right corners of the base body 101 to facilitate the quick positioning and installation of the gantry. A plurality of base mounting grooves 110 are provided at the bottom edge of the base body 101 to facilitate the alignment and installation of the base body 101.

[0048] Through the structural design of the support base 100, the top surface of the base body 101 is set as an irregular support surface, which is composed of a flat straight surface 1102, a convex surface 1103, an inclined lower surface 1104, an arc connecting surface 1105 and an inclined upper surface 1106, so as to meet the installation requirements of components such as the gantry, moving workbench, and tool magazine of the heavy-duty cutting machine. And vertical stiffeners 1107, first diagonal stiffeners 1108, second diagonal stiffeners 1109, third diagonal stiffeners 1110, etc. are set according to the force conditions of different surfaces, so that there is an included angle between the internal stiffeners of the base body 101 and the support surface, and a triangular stable structure is presented. Moreover, the intersecting distributed stiffeners can enhance the strength of the support surface. At the same time, by arranging hollow holes 1111 in the base body 101, the weight of the base can be effectively reduced, and combined with the structural design of the stiffeners, the strength and stability of the base can be maximally guaranteed while reducing the weight.

[0049] The moving work platform mechanism 200 installed on the support base 100 (refer to Figures 5 to 7 shown), the moving work platform mechanism 200 includes Y-direction guide rails 250 installed in parallel at intervals in the Y-direction guide rail installation groove 103 on the support base 100, a Y-direction moving plate 220 is installed on the Y-direction guide rails 250, X-direction guide rails 230 are installed in parallel at intervals on the Y-direction moving plate 220, a workbench 210 is installed on the X-direction guide rails 230, a Y-direction driving module 260 is installed on the support base 100 and connected to the Y-direction moving plate 220, and an X-direction driving module 240 is installed on the Y-direction moving plate 220 and connected to the workbench 210. During actual work, the workpiece to be processed is fixed on the workbench 210 by a tool claw, and the workbench 210 can be accurately moved on the X-direction guide rails 230 and Y-direction guide rails 250 by the X-direction driving module 240 and the Y-direction driving module 260.

[0050] The workbench 210 includes a workbench body 212, and a plurality of T-shaped grooves 213 are arranged in parallel at intervals on the top surface of the workbench body 212 to facilitate the docking of the tool claw on the workbench 210. A reinforced support bottom plate 211 is installed at the bottom of the workbench body 212. The reinforced support bottom plate 211 includes a bottom frame, and six reinforcing blocks 214 are installed in the bottom frame in a matrix distribution. A plurality of reinforcing rib connecting rings 215 are arranged between the reinforcing blocks 214. The adjacent reinforcing rib connecting rings 215 and the reinforcing blocks 214, adjacent reinforcing blocks 214 and reinforcing blocks 214, adjacent reinforcing rib connecting rings 215 and reinforcing rib connecting rings 215, adjacent reinforcing rib connecting rings 215 and the bottom frame, and adjacent reinforcing blocks 214 and the bottom frame are all connected by reinforcing ribs 216 distributed in a "rice" shape.

[0051] The bottom frame of the reinforcing support base plate 211 is welded to the bottom surface of the workbench body 212. A central hole 217 is provided at the center of each reinforcing block 214. Four lower alignment fixing screw holes 219 are provided on each reinforcing block 214. Upper alignment fixing screw holes 2110 corresponding to the lower alignment fixing screw holes 219 are provided on the top surface of the workbench body 212. After the upper alignment fixing screw holes 2110 and the lower alignment fixing screw holes 219 are aligned, they are fastened with screws. Through the above structural design, the connection strength between the reinforcing support base plate 211 and the workbench body 212 can be improved. A limiting installation block 218 is also installed inside the reinforcing support base plate 211 to facilitate the quick limiting installation of the workbench 210.

[0052] Through the structural design of the workbench 210 of the present invention, by installing a reinforcing support base plate 211 at the bottom of the workbench 210, the support strength of the workbench 210 is enhanced, and through the structural design of the reinforcing support base plate 211, through the design that the adjacent reinforcing rib connection rings 215 and the reinforcing blocks 214, adjacent reinforcing blocks 214 and reinforcing blocks 214, adjacent reinforcing rib connection rings 215 and reinforcing rib connection rings 215, adjacent reinforcing rib connection rings 215 and the bottom frame, and adjacent reinforcing blocks 214 and the bottom frame are all connected by the reinforcing ribs 216 distributed in a "rice" shape, it can cope with different load changes on the surface of the workbench 210, make the stress on the surface of the workbench 210 evenly distributed, thereby improving the overall rigidity of the workbench 210, and further meeting the rigidity requirements when the four spindles of the four-spindle heavy cutting machine perform heavy cutting processing simultaneously.

[0053] The cutting spindle mechanism 300 (refer to Figures 8 to 10 shown) installed on the support base 100 and above the moving work platform mechanism 200, the cutting spindle mechanism 300 includes a gantry frame 310. The front side of the top of the gantry frame 310 protrudes forward. The Z-axis hanging plate 320 is installed at the protruding part of the gantry frame 310 that protrudes forward. During actual work, the processing space below the cutting spindle assembly 330 can be enlarged. Four independently arranged cutting spindle assemblies 330 are installed on the Z-axis hanging plate 320. Diagonal reinforcing ribs are provided below the protruding part of the front side of the top of the gantry frame 310 to improve the support strength of the gantry frame 310 for the Z-axis hanging plate 320 and the cutting spindle assemblies 330. A plurality of hollow holes are provided on both the gantry frame 310 and the Z-axis hanging plate 320 to reduce the self-weight of the gantry frame 310 and the Z-axis hanging plate 320 and save materials.

[0054] The cutting spindle assembly 330 includes two Z-axis guide rails 331 that are arranged in parallel at intervals and extend along the Z-axis and are installed on the Z-axis hanging plate 320. The Z-axis linear module 332 is fixed on the Z-axis guide rail 331. The Z-axis drive motor 333 is installed at the top of the Z-axis hanging plate 320 and is connected to the Z-axis linear module 332. The spindle cutting module 335 is installed on the Z-axis linear module 332. During actual operation, the Z-axis linear module 332 can be precisely moved on the Z-axis guide rail 331 by driving of the Z-axis drive motor 333. A Z-axis limit block 334 is installed at the bottom of the Z-axis guide rail 331 to prevent the position where the Z-axis linear module 332 drives the spindle cutting module 335 to move from exceeding the maximum moving position.

[0055] The spindle cutting module 335 includes a spindle box 3351. The spindle box 3351 is fixed on the Z-axis linear module 332. The spindle body 3353 is installed along the Z-axis on the spindle box 3351 and is arranged downward. The spindle drive motor 3352 is installed at the top of the spindle box 3351 and is connected to the spindle body 3353. A tool changing chuck 3354 is installed at the bottom of the spindle body 3353, and a cutting tool is installed on the tool changing chuck 3354. In the present invention, the spindle cutting module 335 is set as a direct drive type by the motor. The spindle drive motor 3352 can directly drive the spindle body 3353 to drive the cutting tool to rotate at a high speed, which can reduce vibration. At the same time, a tool changing chuck 3354 is provided, which can improve the tool changing efficiency. Moreover, the four spindle cutting modules 335 can be independently processed, greatly improving the production efficiency.

[0056] Through the design of the spindle installation structure in the present invention, by only bearing the movement of the four spindles in the Z-axis direction on the gantry frame 310 and not performing the movement in the X-axis direction, it is beneficial to improve the stability of the spindle during processing and reduce the resonance generated during heavy cutting processing with multiple axes simultaneously, thereby ensuring the processing accuracy. During actual operation, by providing a complete Z-axis hanging plate 320, no X guide rail is provided on the Z-axis hanging plate 320, and only independent Z-axis guide rails 331 are provided. The four independently provided spindle cutting modules 335 can be independently controlled in the Z direction through the Z-axis linear module 332 and the Z-axis drive motor 333. Therefore, the four spindle cutting modules 335 can move independently without generating movement interference and reduce the resonance generated during heavy cutting processing with four axes simultaneously, thereby ensuring the processing accuracy.

[0057] The chain tool magazine mechanism 400 installed on the support base 100 and located behind the moving work platform mechanism 200 (refer to Figures 11 to 18As shown in the figure, the chain tool magazine mechanism 400 includes a moving base 410. Four chain tool magazine devices 420 that are arranged in parallel at intervals and correspond to the cutting spindle assembly 330 are installed on the moving base 410. A tool magazine Y-direction driving assembly is installed at the bottom of the moving base 410. The tool magazine Y-direction driving assembly can drive the moving base 410 to move back and forth. When the cutting spindle assembly 330 needs to change tools, the tool magazine Y-direction driving assembly can drive the moving base 410 to move forward, pushing the tool in the chain tool magazine device 420 below the tool changing chuck 3354. The Z-axis driving motor 333 drives the spindle cutting module 335 to move downward, and makes the tool changing chuck 3354 contact with the tool in the chain tool magazine device 420, realizing automatic tool change. After the tool change is completed, the tool magazine Y-direction driving assembly can drive the moving base 410 to move backward, and the chain tool magazine device 420 is retracted to the initial position.

[0058] The moving base 410 includes a moving base body 411. A guide rail limit docking strip 412 for connecting with the guide rail is installed at the bottom of the moving base body 411 to facilitate the overall operation of the moving base body 411 driving the four chain tool magazine devices 420. A lead screw mounting seat 413 connected to the lead screw is also installed at the center of the bottom of the moving base body 411 to facilitate the connection with the lead screw that drives the overall movement of the moving base body 411.

[0059] Four chain tool magazine devices 420 that are arranged in parallel at intervals are installed on the moving base 410. Each chain tool magazine device 420 includes an independent frame 421. The frame 421 is fixed on the moving base body 411 of the moving base 410. Two sprockets 4223 that are arranged in parallel at intervals are installed at the front and rear ends of the frame 421. One of the sprockets 4223 is connected to the driving assembly 422. The driving assembly 422 includes a chain driving motor 4221 and a planetary reducer 4222. The planetary reducer 4222 is installed below the sprocket 4223 and connected to the sprocket 4223. The chain driving motor 4221 is connected to the planetary reducer 4222. The planetary reducer 4222 and the chain driving motor 4221 can both be built into the tool magazine, which can save a large amount of space.

[0060] Two sprockets 4223 are connected by an endless chain 424. The chain 424 is a double-row composite chain to improve the strength of the chain 424. A lower annular guide bar 425 is installed on the outer periphery below the endless chain 424 on the frame 421. A plurality of uniformly spaced cutter claw assemblies 423 are installed on the endless chain 424. The cutter claw assembly 423 includes a cutter claw seat 4231. The cutter claw seat 4231 is fixed on the chain 424. An upper guide bearing 4232 is installed at the rear end of the cutter claw seat 4231. Two symmetrically distributed clamping arms 4233 are fixed on the cutter claw seat 4231 through a rotating pin shaft 4234. A strong spring 4235 is installed between the rear ends of the two clamping arms 4233. A guide bar docking block 4236 is installed below the cutter claw seat 4231. The guide bar docking block 4236 is inserted into the lower annular guide bar 425 located below the endless chain 424. An upper guide cover 4210 covers the upper part of the frame 421. An annular guide groove is provided in the upper guide cover 4210. The upper guide bearings 4232 provided on each cutter claw assembly 423 are all embedded in the annular guide groove provided in the upper guide cover 4210. A proximity switch mounting seat 426 is installed on one side of the front end of the endless chain 424 on the frame 421. A proximity switch 427 corresponding to the cutter claw assembly 423 is installed on the proximity switch mounting seat 426. During actual operation, it is possible to determine whether there is a tool 428 on the corresponding cutter claw assembly 423 through the proximity switch 427, so as to provide a discrimination signal for tool change of the main shaft. A chain adjusting block 429 for adjusting the tightness of the chain is also installed on the frame 421. When the chain 424 becomes loose, the tightness of the chain 424 can be adjusted only by adjusting the chain adjusting block 429, which is convenient to operate.

[0061] The present invention adopts four independent and parallelly spaced chain tool magazine devices 420 on the same moving base 410. Each chain tool magazine device 420 can correspond to a main shaft to provide a tool magazine. The overall tool magazine adopts a chain structure, which not only makes the structural layout of the tool magazine more compact, but also greatly increases the capacity of the tool magazine, and can meet the tool change requirements for simultaneous independent machining of a four-spindle heavy cutting machine. Through the structural design of the cutter claw assembly 423, the present invention adopts a cutter claw structure design with elastic double arms for automatic opening and closing. During actual operation, the strong spring 4235 installed between the rear ends of the two clamping arms 4233 is used to push the clamping arms 4233 to clamp the tool. When the main shaft takes the tool, only the thrust of the strong spring 4235 needs to be overcome to take out the tool from the clamping arms 4233. This not only simplifies the structure of the cutter claw, but also greatly facilitates the tool loading and tool taking operations.

[0062] Through the structural design of the upper and lower guides of the tool magazine, the upper part of the tool magazine is limited by embedding the upper guide bearings 4232 provided on each tool jaw assembly 423 into the annular guide grooves provided in the upper guide cover 4210. The lower part of the tool magazine is limited by inserting the guide bar docking blocks 4236 provided on each tool jaw assembly 423 into the lower annular guide bar 425 located below the annular chain 424. This will limit the movement directions of each tool jaw assembly 423 driven by the chain 424. Even if the chain 424 becomes loose during use, it will not affect the positioning accuracy of each tool jaw assembly 423, thereby improving the operating accuracy of the entire tool magazine.

[0063] Through the design of the spindle installation structure and the moving work platform mechanism structure, only the movement of multiple spindles in the Z-axis direction is carried by the gantry frame where the spindles are installed, without performing the movement in the X-axis direction. The X-axis and Y-axis movements of the workpiece are driven by the moving work platform mechanism, which is beneficial to improving the stability of the spindle during machining and the stability of the workpiece movement, reducing the resonance generated during heavy cutting with multiple axes simultaneously, and thus ensuring the machining accuracy.

[0064] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the drawings. Therefore, all equivalent or modified implementations completed without departing from the spirit disclosed by the present invention fall within the protection scope of the present invention.

Claims

1. A numerically controlled four-spindle heavy cutting machine, characterized in that Comprising: Support base; A mobile working platform mechanism installed on the support base. The mobile working platform mechanism includes Y-direction guide rails installed on the support base at intervals in parallel. A Y-direction moving plate is installed on the Y-direction guide rails. X-direction guide rails are installed on the Y-direction moving plate at intervals in parallel. A workbench is installed on the X-direction guide rails. A Y-direction driving module is installed on the support base and connected to the Y-direction moving plate. An X-direction driving module is installed on the Y-direction moving plate and connected to the workbench; A cutting spindle mechanism installed on the support base and located above the mobile working platform mechanism. The cutting spindle mechanism includes a gantry frame. A Z-axis hanging plate is installed on the gantry frame. A plurality of independently arranged cutting spindle assemblies are installed on the Z-axis hanging plate. Each cutting spindle assembly includes two Z-axis guide rails installed on the Z-axis hanging plate at intervals in parallel and extending along the Z direction. A Z-axis linear module is fixed on the Z-axis guide rails. A Z-axis driving motor is installed at the top of the Z-axis hanging plate and connected to the Z-axis linear module. A spindle cutting module is installed on the Z-axis linear module; A chain tool magazine mechanism installed on the support base and located behind the mobile working platform mechanism. The chain tool magazine mechanism includes a mobile base. A plurality of chain tool magazine devices installed on the mobile base at intervals in parallel and corresponding to the cutting spindle assemblies are installed on the mobile base. A tool magazine Y-direction driving component is installed at the bottom of the mobile base.

2. The numerically controlled four-spindle heavy cutting machine according to claim 1, characterized in that: Each chain tool magazine device includes an independent frame. The frame is fixed on the mobile base. Two sprockets installed at intervals in parallel are installed at the front and rear ends of the frame. One of the sprockets is connected to a chain driving component. The two sprockets are connected by an annular chain. A lower annular guide strip is installed on the outer periphery below the annular chain on the frame. A plurality of uniformly spaced tool claw components are installed on the annular chain. Each tool claw component includes a tool claw seat. The tool claw seat is fixed on the chain. An upper guide bearing is installed at the rear end of the tool claw seat. Two symmetrically distributed clamping arms are fixed on the tool claw seat by a rotating pin shaft. A strong spring is installed between the rear ends of the two clamping arms. A guide strip docking block is installed below the tool claw seat. The guide strip docking block is inserted into the lower annular guide strip located below the annular chain. An upper guide cover covers the upper part of the frame. An annular guide groove is arranged in the upper guide cover. The upper guide bearings arranged on each tool claw component are embedded in the annular guide groove arranged in the upper guide cover.

3. The numerically controlled four-spindle heavy cutting machine according to claim 2, characterized in that: The mobile base includes a mobile base body. A guide rail limit docking strip for connecting with a guide rail is installed at the bottom of the mobile base body. A lead screw mounting seat connected to a lead screw is also installed at the center of the bottom of the mobile base body. The lead screw for driving the movement of the mobile base body is installed along the Y direction on the lead screw mounting seat. The lead screw is connected to the tool magazine Y-direction driving component.

4. The numerically controlled four-spindle heavy cutting machine according to claim 2, wherein: The chain driving component includes a chain driving motor and a planetary reducer. The planetary reducer is installed below the sprocket and connected to the sprocket. The chain driving motor is connected to the planetary reducer.

5. The numerically controlled four-spindle heavy cutting machine according to claim 2, characterized in that: A proximity switch mounting base is installed on one side of the front end of the annular chain on the frame. A proximity switch corresponding to the claw assembly is installed on the proximity switch mounting base. A chain adjusting block for adjusting the tightness of the chain is also installed on the frame.

6. The numerically controlled four-spindle heavy cutting machine according to claim 1, characterized in that: The spindle cutting module includes a spindle box. The spindle box is fixed on the Z-axis linear module. The spindle body is installed on the spindle box along the Z direction and is arranged downward. The spindle drive motor is installed on the top of the spindle box and is connected to the spindle body. A tool change chuck is installed at the bottom of the spindle body.

7. The numerically controlled four-spindle heavy cutting machine according to claim 1, characterized in that: The support base includes a base body. The base body includes a bottom frame and an irregular support surface integrally provided on the top of the bottom frame. The support surface includes a flat surface at the center of the top of the bottom frame. The flat surface is connected to the bottom frame through a vertical reinforcing rib provided below the center of the bottom of the flat surface. Convex surfaces protruding upward are provided on both the left and right sides of the flat surface. An obliquely downward sloping surface is provided on the other side of the convex surface. An arc-shaped connecting surface is provided on the other side of the sloping surface. An obliquely upward sloping surface is provided on the other side of the arc-shaped connecting surface. The other end of the obliquely upward sloping surface is connected to the edge of the bottom frame. The top of the first diagonal reinforcing rib is connected to the bottom surface at the butt joint of the flat surface and the convex surface. The bottom surface of the first diagonal reinforcing rib is connected to the bottom frame. The top of the second diagonal reinforcing rib is connected to the center of the top of the sloping surface. The bottom of the second diagonal reinforcing rib is connected to the bottom frame. The top of the third diagonal reinforcing rib is connected to the bottom surface at the butt joint of the arc-shaped connecting surface and the obliquely upward sloping surface. The bottom of the third diagonal reinforcing rib is connected to the bottom frame. A plurality of hollow holes are provided in the base body.

8. The numerically controlled four-spindle heavy cutting machine according to claim 7, characterized in that: A Y-axis guide rail mounting groove is provided along the Y direction on the convex surface of the base body. A guide rod mounting seat and a limit block are installed on the flat surface of the base body. A Y-axis rod mounting groove is provided along the Y direction on the arc-shaped connecting surface of the base body. Gantry support blocks are provided at the upper left and upper right corners of the base body.

9. The stable base structure of the numerically controlled four-spindle heavy cutting machine according to claim 1, wherein: The workbench includes a workbench body. A reinforced support bottom plate is installed at the bottom of the workbench body. The reinforced support bottom plate includes a bottom frame. A plurality of reinforcing blocks distributed in a matrix are installed in the bottom frame. A plurality of reinforcing rib connecting rings are provided between the reinforcing blocks. The adjacent reinforcing rib connecting rings and reinforcing blocks, adjacent reinforcing blocks and reinforcing blocks, adjacent reinforcing rib connecting rings and reinforcing rib connecting rings, adjacent reinforcing rib connecting rings and the bottom frame, and adjacent reinforcing blocks and the bottom frame are all connected through reinforcing ribs distributed in a "rice" shape.

10. The stable base structure of the numerically controlled four-spindle heavy cutting machine according to claim 9, characterized in that: A plurality of parallel and spaced T-shaped grooves are provided on the top surface of the workbench. The bottom frame of the reinforced support bottom plate is welded to the bottom surface of the workbench. A plurality of lower alignment fixing screw holes are provided on each reinforcing block. Upper alignment fixing screw holes corresponding to the lower alignment fixing screw holes are provided on the top surface of the workbench. After the upper alignment fixing screw holes and the lower alignment fixing screw holes are aligned, they are fastened with screws.

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