A CNC thread grinder for large nut processing

Abstract

The present invention discloses a CNC thread grinder, wherein a CNC thread grinder for processing large nuts comprises a CNC housing, a CNC bed is fixedly connected in the CNC housing, a limiting module and a processing module are connected to the CNC bed, the limiting module comprises a headstock spindle, the headstock spindle is slidably connected to the CNC bed along the Z-axis direction, a correction spindle is fixedly connected to one side of the headstock spindle, a limiting component for facilitating the user to pick up the workpiece is connected to one side of the headstock spindle, the processing module comprises a column, the column is slidably connected to the CNC bed along the Y-axis direction, a turntable is slidably connected to the column, an electric spindle for processing the inner wall of the workpiece is connected to the turntable, and a retractable cutting knife is fixedly connected to the electric spindle. The technical solution of the present invention aims to reduce the mutual interference of structures, thereby reducing the deformation of the overall structure and ensuring processing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of numerically controlled thread grinders, in particular to a numerically controlled thread grinder for machining large nuts. Background Art

[0002] With the continuous advancement of technology, a large number of large-scale processing equipment have emerged to meet the needs of large-scale construction. These equipment often use large nuts for fixed positioning. The internal thread grinding of large nuts requires extremely high precision. The pitch error must be controlled within 0.003μm, and the surface roughness must reach Ra0.2. Therefore, this places higher demands on the precision of the processing equipment. The machine tool must have excellent rigidity and thermal stability, and the accuracy of each axis of the equipment must also reach a high level. In addition, the large nuts are very large, with a maximum length of 700mm and an outer diameter of up to 400mm. The equipment design must support the processing of such large workpieces and ensure accuracy.

[0003] In traditional machine tool design, the Z-axis and Y-axis are usually supported by the same structure. If they share the same frame or support points, the flexibility of the bed structure may increase, thus affecting the overall rigidity and machining accuracy. Summary of the Invention

[0004] The main purpose of the present invention is to provide a CNC thread grinder for processing large nuts, aiming to reduce mutual interference of the structures, thereby reducing deformation of the overall structure and ensuring processing accuracy.

[0005] To achieve the above-mentioned purpose, the present invention proposes a CNC thread grinder for machining large nuts, comprising:

[0006] A CNC housing, wherein a CNC bed is fixedly connected to the CNC housing, and a limit module and a processing module are connected to the CNC bed;

[0007] The limit module includes a headstock spindle, which is slidably connected to the CNC machine bed along the Z-axis direction, a correction spindle is fixedly connected to one side of the headstock spindle, and a limit assembly is connected to one side of the headstock spindle for facilitating the user to pick up the workpiece;

[0008] The processing module includes a column, which is slidably connected to the CNC bed along the Y-axis direction. A turntable is slidably connected to the column. An electric spindle for processing the inner wall of the workpiece is connected to the turntable. A retractable cutting knife is fixedly connected to the electric spindle.

[0009] In a possible embodiment, the limiting assembly includes a support plate and a locking plate, the support plate is slidably connected to the CNC bed along the Z-axis direction, the locking plate and the support plate are rotatably connected with the side as a reference, a center frame is slidably connected to the locking plate, two support columns are threadedly connected to the center frame, a positioning assembly is connected to one side of the support column, and a flipping assembly for driving the locking plate to flip is connected to the lower side of the locking plate.

[0010] In a possible implementation, the positioning component includes:

[0011] A lifting block, wherein the lifting block is slidably connected to the center frame;

[0012] Two positioning plates, each of which is rotatably connected to the center frame, the lower end of each positioning plate abuts against the side of the lifting block, and the lifting block and the upper end of each positioning plate are rotatably connected to a positioning wheel;

[0013] a driving tooth rotatably connected to the center frame and meshing with the inner wall of the lifting block;

[0014] A positioning motor is fixedly connected to the outer side surface of the center frame, and a driving shaft of the positioning motor is fixedly connected to the driving gear.

[0015] In a possible implementation, the flip assembly includes:

[0016] Two turning cylinders, the two turning cylinders are respectively fixedly connected to the same side of the support plate and the clamping plate, and a turning column is rotatably clamped between the two turning cylinders;

[0017] A plurality of universal ball bearings, each of which is threadedly connected to the lower side of the positioning plate;

[0018] The sliding column is fixedly connected to the CNC bed, the sliding column is arranged on the lower side of the positioning plate, the sliding column axis and the support plate are inclined, the sliding column is slidingly connected with a positioning block, the positioning block is slidingly connected with a limiting block, and the limiting block is slidingly connected to the lower side of the positioning plate.

[0019] In a possible implementation manner, a limiting groove is provided on the limiting block, and the locking block abuts against an inner wall of the limiting groove.

[0020] In a possible implementation manner, a spacing groove is provided on the central frame.

[0021] In a possible embodiment, a positioning block is fixedly connected to the positioning plate, a positioning groove is provided on the lower side of the central frame, and an upper side of the positioning block is inclined downward in a direction away from the processing module.

[0022] In the technical solution of the present invention, the limit module and the processing module are distributed in two axial directions on the CNC machine bed. In traditional machine tool design, the Z-axis and Y-axis often rely on the same structure for support. If the two share the same frame or support points, it may increase the flexibility of the CNC machine bed structure, thereby affecting the rigidity and precision of the CNC machine bed. By separating the Z-axis and Y-axis, each axis can independently obtain more optimized load-bearing capacity and support, reducing mutual interference between the structures, and ensuring that each axis will not affect each other when subjected to force, thereby reducing deformation of the overall structure and ensuring processing accuracy.

[0023] In addition, the limit component in the limit module can accurately position and support the round rod-shaped workpiece, so that the internal thread of the large nut maintains higher stability during processing. When used in conjunction with the flip component, it not only improves the convenience during the installation and placement of the workpiece, but also enables workers or auxiliary machinery to clamp the workpiece more easily, thereby effectively improving the working efficiency of the equipment and significantly reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 This is an enlarged schematic diagram of a CNC thread grinder for processing large nuts in the present invention. Figure 1 ;

[0026] Figure 2 A partially enlarged schematic diagram of a CNC thread grinder for large nut processing according to the present invention Figure 1 ;

[0027] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0028] Figure 4 A partially enlarged schematic diagram of a CNC thread grinder for large nut processing according to the present invention Figure 2 ;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of B in the middle;

[0030] Figure 6 A partially enlarged schematic diagram of a CNC thread grinder for large nut processing according to the present invention Figure 3 ;

[0031] Figure 7 A partially enlarged schematic diagram of a CNC thread grinder for large nut processing according to the present invention Figure 4 .

[0032] Description of Figure Numbers:

[0033] 11. CNC housing; 12. CNC bed; 13. Headstock spindle; 14. Correction spindle; 15. Column; 16. Turntable; 17. Electric spindle; 18. Cutting knife; 21. Support plate; 22. Positioning plate; 221. Positioning block; 222. Positioning slot; 23. Center frame; 231. Spacer slot; 24. Support column; 31. Lifting block; 32. Positioning plate; 33. Positioning wheel; 34. Driving gear; 35. Positioning motor; 41. Turning cylinder; 42. Turning column; 43. Universal ball; 44. Sliding column; 45. Positioning block; 46. Limit block; 461. Limit slot.

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] The present invention provides a numerically controlled thread grinder for machining large nuts.

[0037] Reference Figures 1 to 7 ,include;

[0038] A CNC housing 11 is fixedly connected to a CNC bed 12, and a limit module and a processing module are connected to the CNC bed 12;

[0039] The limit module includes a headstock spindle 13, which is slidably connected to the CNC bed 12 along the Z-axis direction. A correction spindle 14 is fixedly connected to one side of the headstock spindle 13. A limit assembly is connected to one side of the headstock spindle 13 to facilitate the user to pick up the workpiece;

[0040] The processing module includes a column 15, which is slidably connected to the CNC bed 12 along the Y-axis direction. A turntable 16 is slidably connected to the column 15, and an electric spindle 17 for processing the inner wall of the workpiece is connected to the turntable 16. A retractable cutting knife 18 is fixedly connected to the electric spindle 17;

[0041] The limit modules and processing modules are distributed along two axes on the CNC machine bed 12. In traditional machine tool design, the Z-axis and Y-axis often rely on the same structure for support. If the two share the same frame or support points, it may increase the flexibility of the CNC machine bed 12 structure, thereby affecting the rigidity and precision of the CNC machine bed 12. By separating the Z-axis and Y-axis, each axis can independently obtain more optimized load-bearing capacity and support, reducing mutual interference between the structures. This can prevent each axis from affecting each other when subjected to force, thereby reducing deformation of the overall structure and ensuring processing accuracy.

[0042] Furthermore, the limit assembly in the limit module can precisely position and support round bar-shaped workpieces, allowing the internal threads of large nuts to maintain greater stability during machining. Combined with the flip assembly, this not only improves convenience during workpiece installation and placement, but also enables workers or auxiliary machinery to more easily clamp workpieces, effectively improving equipment efficiency and significantly reducing worker labor intensity.

[0043] In addition, the retractable cutting blade 18 in the processing module can move up and down with the column 15, and with the cooperation of the turntable 16, the grinding helix angle can be adjusted, so that the cutting blade 18 can complete the processing of internal threads with different inclination angles, improving the processing accuracy. Therefore, the machine tool can complete all actions in the thread grinding process in a single clamping, including feed, grinding, retracting, grinding wheel correction, grinding wheel spindle swing, etc. The working directions of the limit module and the processing module are mutually perpendicular, and both use Heidenhain gratings for position feedback.

[0044] The headstock spindle 13 is directly driven by the electric spindle motor and adopts a circular encoder for position feedback, which has high precision. The electric spindle 17 is driven by a built-in motor. Both are forced to be cooled at a constant temperature by a water cooler to ensure the spindle works stably and with high precision.

[0045] The CNC housing 11 can fully enclose the inside for protection. An automatic oil mist suction device is provided inside the CNC housing 11 to ensure the quality of the workshop air environment. The grinding fluid of the workpiece during production is filtered by a magnetic separator to ensure the processing accuracy of the machine tool.

[0046] Reference Figures 1 to 7 The limiting assembly includes a support plate 21 and a positioning plate 22. The support plate 21 is connected to the CNC bed 12 in a sliding manner along the Z-axis direction. The positioning plate 22 is rotatably connected to the support plate 21 based on the side. A center frame 23 is slidably connected to the positioning plate 22. Two support columns 24 are threadedly connected to the center frame 23. A positioning assembly is connected to one side of the support column 24. A flip assembly for driving the positioning plate 22 to flip is connected to the lower side of the positioning plate 22.

[0047] The limit assembly precisely positions and supports round rod-shaped workpieces, allowing the internal threads of large nuts to maintain greater stability during processing. When used in conjunction with the flip assembly, it not only improves convenience during workpiece installation and placement, but also enables workers or auxiliary machinery to clamp workpieces more easily, thereby effectively improving the equipment's operating efficiency and significantly reducing workers' labor intensity.

[0048] Reference Figures 5 to 7 , the positioning components include:

[0049] A lifting block 31 is slidably connected to the center frame 23;

[0050] Two positioning plates 32, each positioning plate 32 is rotatably connected to the center frame 23, the lower end of each positioning plate 32 abuts against the side of the lifting block 31, and the lifting block 31 and the upper end of each positioning plate 32 are rotatably connected to the positioning wheel 33;

[0051] A driving tooth 34 is rotatably connected to the center frame 23 and engages with the inner wall of the lifting block 31;

[0052] The positioning motor 35 is fixedly connected to the outer side of the center frame 23, and the driving shaft of the positioning motor 35 is fixedly connected to the driving gear 34;

[0053] In the positioning assembly, the driving gear 34 is driven to rotate by the positioning motor 35, thereby controlling the lifting block 31 to move up and down, and then the positioning plate 32 abutting the side of the lifting block 31 is flipped, so that when the lifting block 31 moves up, the positioning plates 32 on both sides will also flip toward the center, so that after the round rod-shaped workpiece is installed on the center frame 23, the workpiece can be rotated more conveniently, which is convenient for the user to position the workpiece and the positioning cone on the four-jaw chuck, so that the workpiece can be better installed. At the same time, after the workpiece processing is completed, the positioning assembly can also facilitate the user to clamp and pick up the workpiece, thereby improving the working efficiency of the equipment and reducing the labor intensity of workers.

[0054] Reference Figures 2 to 7 , the flip components include:

[0055] Two turning cylinders 41, the two turning cylinders 41 are fixedly connected to the same side of the support plate 21 and the clamping plate 22, and a turning column 42 is rotatably clamped between the two turning cylinders 41;

[0056] A plurality of universal ball transfers 43, each of which is threadedly connected to the lower side of the positioning plate 22;

[0057] The universal ball 43 is used to ensure that when the locking block 45 does not abut the locking plate 22, the upper side of the locking plate 22 is consistent with the upper side of the support plate 21 when the locking plate 22 slides along with the support plate 21, so that the workpiece installed on the locking plate 22 can be processed stably.

[0058] The slide column 44 is fixedly connected to the CNC bed 12. The slide column 44 is arranged on the lower side of the positioning plate 22. The axis of the slide column 44 is inclined with the support plate 21. The slide column 44 is slidably connected to a positioning block 45. The positioning block 45 is slidably connected to a limiting block 46. The limiting block 46 is slidably connected to the lower side of the positioning plate 22.

[0059] The flipping assembly can ensure that the positioning plate 22 can move smoothly with the support plate 21. However, after the workpiece processing is completed, when the positioning plate 22 moves toward the processing module, the positioning plate 22 will flip toward the door panel of the CNC shell 11, so that the workpiece placed on the center frame 23 can be more easily picked up by workers or auxiliary equipment, and it is convenient to install new workpieces to be processed, thereby improving the processing stability of the equipment and the efficiency of product processing.

[0060] Reference Figures 2 to 7 The limiting block 46 is provided with a limiting groove 461, and the positioning block 45 abuts against the inner wall of the limiting groove 461;

[0061] When the locking plate 22 is moved toward the four-jaw chuck through the support plate 21, the upper side of the locking plate 22 is consistent with the upper side of the support plate 21, so that the workpiece placed on the center frame 23 remains stable. However, when the limit block 46 abuts against the side of the inner wall of the limit groove 461 closest to the bottom surface of the locking plate 22, it means that the locking plate 22 will flip over as the locking block 45 moves upward, making it easier for the user to pick up the workpiece.

[0062] Reference Figures 3 to 6 , a spacing groove 231 is provided on the center frame 23;

[0063] The overall thickness of the center frame 23 is increased so that the center frame 23 can provide a stronger support for the workpiece. At the same time, the spacing groove 231 is opened to reduce the overall mass of the center frame 23, so that the center frame 23 has sufficient strength, while reducing the production cost and making it easier for workers to place it.

[0064] Reference Figures 5 to 7 A positioning block 221 is fixedly connected to the positioning plate 22, a positioning groove 222 is provided on the lower side of the center frame 23, and the upper side of the positioning block 221 is tilted downward away from the processing module;

[0065] When the positioning plate 22 is flipped away from the processing module, the thickness of the side of the positioning block 221 facing the processing module is greater than the other side, so that this side has greater supporting strength, so that when the positioning plate 22 is flipped, the movement of the center frame 23 is more stable, thereby improving the movement stability of the center frame 23.

[0066] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A CNC thread grinder for large nut processing, characterized in that: include: A numerical control housing (11), wherein a numerical control bed (12) is fixedly connected to the numerical control housing (11), and a limit module and a processing module are connected to the numerical control bed (12); The limit module includes a headstock spindle (13), the headstock spindle (13) is slidably connected to the CNC bed (12) along the Z-axis direction, a correction spindle (14) is fixedly connected to one side of the headstock spindle (13), and a limit assembly for facilitating a user to pick up a workpiece is connected to one side of the headstock spindle (13); The processing module includes a column (15), the column (15) is slidably connected to the CNC bed (12) along the Y-axis direction, a turntable (16) is slidably connected to the column (15), the turntable (16) is connected to an electric spindle (17) for processing the inner wall of the workpiece, and a retractable cutting knife (18) is fixedly connected to the electric spindle (17); The limiting assembly includes a support plate (21) and a positioning plate (22), wherein the support plate (21) is slidably connected to the CNC bed (12) along the Z-axis direction, the positioning plate (22) and the support plate (21) are rotatably connected with the side as a reference, a center frame (23) is slidably connected to the positioning plate (22), and two support columns (24) are threadedly connected to the center frame (23), a positioning assembly is connected to one side of the support column (24), and a flip assembly for driving the positioning plate (22) to flip is connected to the lower side of the positioning plate (22); The positioning component includes: A lifting block (31), wherein the lifting block (31) is slidably connected in the center frame (23); Two positioning plates (32), each of the positioning plates (32) is rotatably connected to the center frame (23), the lower end of each positioning plate (32) is in contact with the side of the lifting block (31), and the lifting block (31) and the upper end of each positioning plate (32) are rotatably connected to a positioning wheel (33); A driving tooth (34), the driving tooth (34) being rotatably connected in the center frame (23) and meshing with the inner wall of the lifting block (31); A positioning motor (35), wherein the positioning motor (35) is fixedly connected to the outer side surface of the center frame (23), and a driving shaft of the positioning motor (35) is fixedly connected to the driving gear (34); The flip assembly includes: Two turning cylinders (41), the two turning cylinders (41) are respectively fixedly connected to the same side of the support plate (21) and the clamping plate (22), and a turning column (42) is rotatably clamped between the two turning cylinders (41); A plurality of universal ball bearings (43), each of the universal ball bearings (43) being threadedly connected to the lower side of the positioning plate (22); A slide column (44) is fixedly connected to the CNC bed (12), the slide column (44) is arranged on the lower side of the positioning plate (22), the axis of the slide column (44) is inclined with the support plate (21), the slide column (44) is slidably connected to a positioning block (45), the positioning block (45) is slidably connected to a limiting block (46), and the limiting block (46) is slidably connected to the lower side of the positioning plate (22).

2. The CNC thread grinder for large nut processing according to claim 1, characterized in that: The limiting block (46) is provided with a limiting groove (461), and the locking block (45) abuts against the inner wall of the limiting groove (461).

3. The CNC thread grinder for large nut processing according to claim 1, characterized in that: The center frame (23) is provided with a spacing groove (231).

4. The CNC thread grinder for large nut processing according to claim 1, characterized in that: A positioning block (221) is fixedly connected to the positioning plate (22), a positioning groove (222) is provided on the lower side of the center frame (23), and the upper side of the positioning block (221) is tilted downward in a direction away from the processing module.

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