Numerical control thread grinding machine for large nut machining

Abstract

The numerical control thread grinding machine for large nut machining comprises a numerical control shell, a numerical control machine body is fixedly connected into the numerical control shell, a limiting module and a machining module are connected to the numerical control machine body, and the limiting module comprises a headstock main shaft; the headstock main shaft is slidably connected to the numerical control lathe bed in the Z-axis direction, one side of the headstock main shaft is fixedly connected with a correction main shaft, one side of the headstock main shaft is connected with a limiting assembly used for facilitating a user to take a workpiece, the machining module comprises a stand column, and the stand column is slidably connected to the numerical control lathe bed in the Y-axis direction; a rotary table is connected to the stand column in a sliding mode, an electric spindle used for machining the inner wall of a workpiece is connected to the rotary table, and a telescopic cutting knife is fixedly connected to the electric spindle. According to the technical scheme, mutual interference of structures is reduced, so that deformation of the whole structure is reduced, and the machining precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of numerically controlled thread grinding machines, and particularly to a numerically controlled thread grinding machine for machining large nuts. Background Art

[0002] With the continuous development of technology, in response to the needs of large-scale construction, many large-scale processing equipment have emerged. These devices usually use large nuts for fixing and limiting. The internal thread grinding of large nuts has extremely high precision requirements. The pitch error must be controlled within 0.003 μm, and the surface roughness requirement reaches Ra0.2. Therefore, this poses higher requirements for the precision of the processing equipment. The machine tool must have good rigidity and thermal stability, and the precision of each axis of the equipment must also reach a relatively high level. In addition, the size of large nuts is very large, with a maximum length of up to 700 mm and a maximum outer diameter of up to 400 mm. The equipment design must support the processing of such large-sized workpieces and ensure precision.

[0003] In traditional machine tool designs, the Z-axis and Y-axis usually rely on the same structure for support. If they share the same frame or support points, it may lead to an increase in the flexibility of the bed structure, thereby affecting the overall rigidity and machining precision. Summary of the Invention

[0004] The main object of the present invention is to provide a numerically controlled thread grinding machine for machining large nuts, aiming to reduce the mutual interference of the structure, thereby reducing the deformation of the overall structure and ensuring the machining precision.

[0005] To achieve the above object, a numerically controlled thread grinding machine for machining large nuts proposed by the present invention includes: A numerically controlled housing, in which a numerically controlled bed is fixedly connected, and a limiting module and a processing module are connected to the numerically controlled bed; The limiting module includes a headstock spindle, which is slidably connected to the numerically controlled bed in the Z-axis direction. A dressing spindle is fixedly connected to one side of the headstock spindle, and a limiting component for facilitating the user to pick up the workpiece is connected to one side of the headstock spindle; The processing module includes a column, which is slidably connected to the numerically controlled bed in the Y-axis direction. A turntable is slidably connected to the column, and an electric spindle for machining the inner wall of the workpiece is connected to the turntable. A retractable cutting tool is fixedly connected to the electric spindle.

[0006] In a possible implementation, the limiting component includes a support plate and a clamping plate. The support plate is slidably connected to the numerical control lathe bed in the Z-axis direction. The clamping plate is rotatably connected to the support plate with the side as the reference. A steady rest is slidably connected to the clamping plate. Two support columns are threadedly connected to the steady rest. A positioning component is connected to one side of the support column. A flipping component for driving the clamping plate to flip is connected to the lower side of the clamping plate.

[0007] In a possible implementation, the positioning component includes: A lifting block, which is slidably connected inside the steady rest; Two positioning plates, each of which is rotatably connected inside the steady rest. The lower end of each positioning plate abuts against the side of the lifting block. A positioning wheel is rotatably connected between the lifting block and the upper end of each positioning plate; A driving gear, which is rotatably connected inside the steady rest and meshes with the inner wall of the lifting block; A positioning motor, which is fixedly connected to the outer side of the steady rest. The driving shaft of the positioning motor is fixedly connected to the driving gear.

[0008] In a possible implementation, the flipping component includes: Two flipping cylinders, which are respectively fixedly connected to the same side of the support plate and the clamping plate. A flipping column is rotatably clamped between the two flipping cylinders; A number of universal ball bearings, each of which is threadedly connected to the lower side of the clamping plate; A sliding column, which is fixedly connected to the numerical control lathe bed. The sliding column is arranged on the lower side of the clamping plate. The axis of the sliding column is inclined with respect to the support plate. A clamping block is slidably connected to the sliding column. A limiting block is slidably connected to the clamping block. The limiting block is slidably connected to the lower side of the clamping plate.

[0009] In a possible implementation, a limiting groove is formed on the limiting block, and the clamping block abuts against the inner wall of the limiting groove.

[0010] In a possible implementation, a spacing groove is formed on the steady rest.

[0011] In a possible implementation, a positioning block is fixedly connected to the clamping plate. A positioning groove is formed on the lower side of the steady rest. The upper side surface of the positioning block is inclined downward away from the processing module.

[0012] In the technical solution of the present invention, the limit module and the processing module are distributed in two axial directions on the CNC bed. In traditional machine tool design, the Z axis and the Y axis often rely on the same structure for support. If the two share the same frame or support point, it may increase the flexibility of the CNC bed structure, thereby affecting the rigidity and precision of the CNC bed. By separating the Z axis and the Y axis, each axis can independently obtain more optimized load-bearing capacity and support, reduce mutual interference of the structure, and enable each axis to not affect each other when subjected to force, thereby reducing the deformation of the overall structure and ensuring processing accuracy. 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 can maintain 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

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0014] Figure 1 This is an enlarged schematic diagram of a CNC thread grinder for processing large nuts according to the present invention. Figure 1 ; Figure 2 A partial enlarged schematic diagram of a CNC thread grinder for processing large nuts according to the present invention Figure 1 ; Figure 3 for Figure 2 A is an enlarged schematic diagram; Figure 4 A partial enlarged schematic diagram of a CNC thread grinder for processing large nuts according to the present invention Figure 2 ; Figure 5 for Figure 4 A magnified schematic diagram of B; Figure 6 A partial enlarged schematic diagram of a CNC thread grinder for processing large nuts according to the present invention Figure 3 ; Figure 7 A partial enlarged schematic diagram of a CNC thread grinder for processing large nuts according to the present invention Figure 4 .

[0015] Description of Figure Numbers: 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 groove; 23. Center frame; 231. Spacer groove; 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 groove.

[0016] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] The invention provides a numerically controlled thread grinder for machining large nuts.

[0019] Reference Figures 1 to 7 ,include; A numerical control housing 11, a numerical control bed 12 is fixedly connected inside the numerical control housing 11, and a limit position module and a processing module are connected to the numerical control bed 12; 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, and a limit assembly is connected to one side of the headstock spindle 13 for facilitating the user to take the workpiece; The processing module includes a column 15, which is slidably connected to the CNC bed 12 along the Y-axis direction, and 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, and a retractable cutting knife 18 is fixedly connected to the electric spindle 17; The limit module and the processing module are distributed in two axial directions on the CNC bed 12. In traditional machine tool design, the Z axis and the Y axis often rely on the same structure for support. If the two share the same frame or support point, the flexibility of the CNC bed 12 structure may increase, thereby affecting the rigidity and precision of the CNC bed 12. By separating the Z axis and the Y axis, each axis can independently obtain more optimized load-bearing capacity and support, reduce mutual interference of the structure, and enable each axis to not affect each other when subjected to force, thereby reducing the deformation of the overall structure and ensuring processing accuracy; Moreover, the limiting component in the limiting module can precisely position and support the round bar-shaped workpiece, enabling the internal thread of the large nut to maintain higher stability during processing. When used in conjunction with the flipping component, it not only improves the convenience during workpiece installation and picking, but also enables workers or auxiliary machinery to clamp the workpiece more easily, thereby effectively enhancing the working efficiency of the equipment and significantly reducing the labor intensity of workers. In addition, the retractable cutting tool 18 in the processing module can move up and down along the column 15, and with the cooperation of the turntable 16, adjust the helix angle of grinding, enabling the cutting tool 18 to complete internal thread processing at different inclination angles and improving the processing accuracy. Therefore, the machine tool can complete all the actions in the thread grinding process in one clamping, including feed, grinding, retraction, grinding wheel correction, grinding wheel spindle swing, etc. Among them, the working directions of the limiting module and the processing module are perpendicular to each other, and both use Heidenhain gratings for position feedback. The headstock spindle 13 is directly driven by an electric spindle motor and uses a circular encoder for position feedback, with high precision. The electric spindle 17 is an electric spindle driven by an internal-mounted motor, and both are forced to be cooled at a constant temperature by a water chiller to ensure stable spindle operation and high precision. The numerical control housing 11 can provide full closed protection for the inside. An automatic oil mist absorber is provided inside the numerical control housing 11 to ensure the air quality of the workshop. Among them, the grinding fluid during workpiece production is filtered by a magnetic separator to ensure the machining accuracy of the machine tool.

[0020] Refer to Figures 1 to 7 , the limiting component includes a support plate 21 and a clamping plate 22. The support plate 21 is slidably connected to the numerical control bed 12 along the Z-axis direction. The clamping plate 22 is rotatably connected to the support plate 21 with the side as the reference. A center rest 23 is slidably connected to the clamping plate 22. Two support columns 24 are threadedly connected to the center rest 23. A positioning component is connected to one side of the support column 24. A flipping component for driving the clamping plate 22 to flip is connected to the lower side of the clamping plate 22. The limiting component precisely positions and supports the round bar-shaped workpiece, enabling the internal thread of the large nut to maintain higher stability during processing. When used in conjunction with the flipping component, it not only improves the convenience during workpiece installation and picking, but also enables workers or auxiliary machinery to clamp the workpiece more easily, thereby effectively enhancing the working efficiency of the equipment and significantly reducing the labor intensity of workers.

[0021] Refer to Figures 5 to 7 , the positioning component includes: A lifting block 31, which is slidably connected inside the center rest 23; Two positioning plates 32, each positioning plate 32 is rotatably connected inside the center rest 23. The lower end of each positioning plate 32 abuts against the side of the lifting block 31. A positioning wheel 33 is rotatably connected between the lifting block 31 and the upper end of each positioning plate 32; The driving gear 34 is rotatably connected within the center rest 23 and meshes with the inner wall of the lifting block 31; The positioning motor 35 is fixedly connected to the outer side of the center rest 23, and the drive shaft of the positioning motor 35 is fixedly connected to the driving gear 34; In the positioning assembly, the driving gear 34 is driven to rotate by the positioning motor 35, thereby controlling the up and down movement of the lifting block 31. Further, the positioning plate 32 abutted against the side of the lifting block 31 is flipped. When the lifting block 31 moves upward, the two positioning plates 32 on both sides will also flip towards the center. After the round bar-shaped workpiece is installed in the center rest 23, the workpiece can be rotated more conveniently, facilitating the user to position the workpiece and the positioning cone on the four-jaw chuck, enabling the workpiece to be better installed. At the same time, after the workpiece is processed, the positioning assembly can also facilitate the user to clamp and take the workpiece, improving the working efficiency of the equipment and reducing the labor intensity of the workers.

[0022] Refer to Figures 2 to 7 , the flipping assembly includes: Two flipping cylinders 41 are respectively fixedly connected to the same side of the support plate 21 and the clamping plate 22, and a flipping column 42 is rotatably clamped between the two flipping cylinders 41; A number of universal ball bearings 43 are all threadedly connected to the lower side of the clamping plate 22; The universal ball bearings 43 are used to ensure that when the clamping block 45 does not abut against the clamping plate 22, the upper side of the clamping plate 22 remains flush with the upper side of the support plate 21 when the clamping plate 22 slides along with the support plate 21, enabling the workpiece installed on the clamping plate 22 to be stably processed.

[0023] The sliding column 44 is fixedly connected to the numerical control machine tool bed 12, the sliding column 44 is arranged below the clamping plate 22, the axis of the sliding column 44 is inclined with respect to the support plate 21, a clamping block 45 is slidably connected to the sliding column 44, a limiting block 46 is slidably connected to the clamping block 45, and the limiting block 46 is slidably connected to the lower side of the clamping plate 22; The flipping assembly can ensure that the clamping plate 22 can move smoothly along with the support plate 21. However, after the workpiece is processed, when the clamping plate 22 moves towards the processing module, the clamping plate 22 will flip towards the door panel of the numerical control housing 11, enabling the workpiece placed on the center rest 23 to be more easily taken by the worker or auxiliary equipment, and facilitating the installation of a new workpiece to be processed, improving the processing stability of the equipment and the processing efficiency of the product.

[0024] Refer to Figures 2 to 7 , a limiting groove 461 is formed in the limiting block 46, and the clamping block 45 abuts against the inner wall of the limiting groove 461; When the clamping plate 22 moves towards the four-jaw chuck through the support plate 21, the upper side surface of the clamping plate 22 is kept consistent with the upper side surface of the support plate 21, so that the workpiece placed on the steady rest 23 is kept stable. However, when the limiting block 46 abuts against the side of the inner wall of the limiting groove 461 closest to the bottom surface of the clamping plate 22, it means that the clamping plate 22 will turn over as the clamping block 45 moves upward, thus facilitating the user to take the workpiece.

[0025] Refer to Figures 3 to 6 , a spaced groove 231 is formed in the steady rest 23; The overall thickness of the steady rest 23 is increased so that the steady rest 23 can have a stronger supporting effect on the workpiece. At the same time, the spaced groove 231 is formed to reduce the overall mass of the steady rest 23, so that the steady rest 23 has sufficient strength, and at the same time, the manufacturing cost is reduced, which is convenient for the worker to place its position.

[0026] Refer to Figures 5 to 7 , a positioning block 221 is fixedly connected to the clamping plate 22, and a positioning groove 222 is formed in the lower side of the steady rest 23. The upper side surface of the positioning block 221 slopes downward away from the processing module; When the clamping plate 22 turns over away from the processing module, the thickness of the side of the positioning block 221 facing the processing module is greater than that of the other side, so that this side has greater supporting strength, and when the clamping plate 22 turns over, the movement of the steady rest 23 is more stable, improving the movement stability of the steady rest 23.

[0027] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A numerical control thread grinding machine for processing large nuts, characterized in that, Comprising: A numerical control housing (11), within which a numerical control bed (12) is fixedly connected. A limit module and a machining module are connected to the numerical control bed (12). The limit module includes a headstock spindle (13), which is slidably connected to the numerical control 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 component for facilitating the user to pick up the workpiece is connected to one side of the headstock spindle (13). The machining module includes a column (15), which is slidably connected to the numerical control bed (12) along the Y-axis direction. A turntable (16) is slidably connected to the column (15). An electric spindle (17) for machining the inner wall of the workpiece is connected to the turntable (16), and a retractable cutting tool (18) is fixedly connected to the electric spindle (17).

2. The numerically controlled thread grinding machine for large nut machining according to claim 1, characterized in that, The limit component includes a support plate (21) and a clamping plate (22). The support plate (21) is slidably connected to the numerical control bed (12) along the Z-axis direction. The clamping plate (22) is rotatably connected to the support plate (21) with the side as the reference. A center rest (23) is slidably connected to the clamping plate (22). Two support columns (24) are threadedly connected to the center rest (23). A positioning component is connected to one side of the support column (24), and a flipping component for driving the clamping plate (22) to flip is connected to the lower side of the clamping plate (22).

3. The numerically controlled thread grinding machine for machining large nuts according to claim 2, wherein, The positioning component includes: A lifting block (31), which is slidably connected within the center rest (23). Two positioning plates (32), each of which is rotatably connected within the center rest (23). The lower end of each positioning plate (32) abuts against the side of the lifting block (31). Positioning wheels (33) are rotatably connected between the lifting block (31) and the upper end of each positioning plate (32). A driving gear (34), which is rotatably connected within the center rest (23) and meshes with the inner wall of the lifting block (31). A positioning motor (35), which is fixedly connected to the outer side of the center rest (23). The driving shaft of the positioning motor (35) is fixedly connected to the driving gear (34).

4. The numerically controlled thread grinding machine for machining large nuts according to claim 2, characterized in that, The flipping component includes: Two flipping cylinders (41), which are respectively fixedly connected to the same side of the support plate (21) and the clamping plate (22). A flipping column (42) is rotatably clamped between the two flipping cylinders (41). A number of universal ball bearings (43), each of which is threadedly connected to the lower side of the clamping plate (22). A sliding column (44), which is fixedly connected to the numerical control bed (12). The sliding column (44) is arranged on the lower side of the clamping plate (22). The axis of the sliding column (44) is inclined with respect to the support plate (21). A clamping block (45) is slidably connected to the sliding column (44). A limiting block (46) is slidably connected to the clamping block (45). The limiting block (46) is slidably connected to the lower side of the clamping plate (22).

5. The CNC thread grinding machine for large nut machining according to claim 4, characterized in that, A limiting groove (461) is formed on the limiting block (46). The clamping block (45) abuts against the inner wall of the limiting groove (461).

6. The numerically controlled thread grinding machine for machining large nuts according to claim 2, wherein, The center rest (23) is provided with a spacing groove (231).

7. The numerically controlled thread grinding machine for machining large nuts according to claim 2, characterized in that, A positioning block (221) is fixedly connected to the clamping plate (22). A positioning groove (222) is formed in the lower side of the center rest (23). The upper side surface of the positioning block (221) is inclined downward away from the processing module.

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