A jig for a numerical control rotary table, a numerical control rotary table and a numerical control machine tool

Abstract

The application relates to a jig for a numerical control rotary table, a numerical control rotary table and a numerical control machine tool. The jig is applied to the numerical control rotary table and comprises a mandrel connected with a main shaft arranged in the numerical control rotary table and extending to outside of the numerical control rotary table along the main shaft, a jig bottom plate sleeved on the mandrel and abutting against an outer side wall of the numerical control machine tool, and a grating ruler sleeved on the mandrel and clamped on the jig bottom plate and used for measuring a rotation angle of the numerical control rotary table. The jig for the numerical control rotary table, the numerical control rotary table and the numerical control machine tool are applied to the numerical control rotary table and the numerical control machine tool, the installation space requirement of the numerical control rotary table and the numerical control machine tool is low, debugging and maintenance are easy, and the state of the grating ruler can be directly observed.

Description

Technical Field

[0001] This application relates to the field of CNC machine tool technology, and in particular to a fixture for a CNC rotary table, a CNC rotary table, and a CNC machine tool. Background Technology

[0002] A mechanical CNC rotary table is a high-precision machine tool component used to achieve the rotational movement of workpieces in a horizontal plane. It is widely used in aerospace, automotive manufacturing, mold making, and other fields, and is an indispensable piece of equipment in modern manufacturing. With the development of manufacturing and the increase in automation, the market size of the CNC rotary table industry continues to expand. CNC rotary tables also play a crucial role in the processing of new energy vehicle components, ensuring high-quality production of new energy vehicles and promoting the development of the new energy vehicle industry. In addition, CNC rotary tables are also mainly used in: high-end medical manufacturing, improving mold quality, 3C product component processing, semiconductor manufacturing equipment, and robot joint manufacturing, all providing high-precision, high-efficiency, and high-load-bearing overall performance solutions. Mechanical CNC rotary tables have broad application prospects and significant market value in industrial production.

[0003] Currently, the widely used mechanical CNC rotary tables rely on encoders for position feedback systems, which are based on servo motors. However, due to rotational errors, there is a difference between the actual rotation angle of the CNC rotary table and the angle actually fed back by the encoder, leading to inconsistent precision in the machined products. There are two solutions to this problem: First, an integrated linear encoder is used, integrated into the center of the CNC rotary table spindle. The high precision of the linear encoder accurately outputs the actual rotation angle of the CNC rotary table. However, this solution is complicated to install and difficult to maintain because the linear encoder is directly embedded in the spindle. Second, a separate linear encoder is used, with the fixed scale installed inside the CNC rotary table base and the moving scale connected to the spindle. Accurate position feedback is provided through a reading head. However, this solution is difficult to protect, as the reading head is extremely sensitive, and even slight dirt can cause inaccurate data.

[0004] To overcome the aforementioned problems, a new technical solution is needed in this field to address these issues. Utility Model Content

[0005] The purpose of this application is to provide a fixture for a CNC rotary table, a CNC rotary table, and a CNC machine tool. When this fixture is applied to a CNC rotary table and a CNC machine tool, the installation space requirements for the CNC rotary table and the CNC machine tool are low, it is easy to debug and maintain, and the status of the grating ruler can be directly observed.

[0006] In a first aspect, embodiments of this application provide a fixture for a CNC rotary table, applied in a CNC rotary table, comprising: a mandrel connected to a main spindle disposed within the CNC rotary table and extending along the main spindle disposed within the CNC rotary table to the outside of the CNC rotary table; a fixture base plate sleeved on the mandrel and abutting against the outer wall of the CNC machine tool; and a grating ruler sleeved on the mandrel and clamped on the fixture base plate for measuring the rotation angle in CNC mode.

[0007] In one possible implementation, it further includes: a first sealing ring, which is disposed between the mandrel and the main spindle disposed within the CNC rotary table, for sealing the connection between the mandrel and the main spindle disposed within the CNC rotary table.

[0008] In one possible implementation, a second sealing ring is further included, which is disposed between the fixture base plate and the CNC rotary table to seal the connection between the fixture base plate and the CNC rotary table.

[0009] In one possible implementation, it further includes a gasket, which is sleeved on the mandrel and abuts against the outer wall of the CNC rotary table.

[0010] In one possible implementation, the distance from the end face of the fixture base plate to the bearing surface of the gasket is denoted as A; the dimension of the positioning point of the grating ruler is denoted as B; and the thickness of the gasket is denoted as H; where H=AB.

[0011] In one possible implementation, the dimensional and positional tolerance of the mandrel assembly with the spindle located inside the CNC rotary table is no greater than 0.02 mm.

[0012] In one possible implementation, a locking nut is further included, which is disposed at one end of the mandrel away from the spindle disposed inside the CNC rotary table, for locking the mandrel.

[0013] In one possible implementation, the locking torque of the locking nut is not less than 30 N·m.

[0014] Secondly, embodiments of this application provide a CNC rotary table, including: a spindle; and a fixture for the CNC rotary table as described in any of the preceding claims, connected to the spindle and extending outward along the spindle.

[0015] Thirdly, embodiments of this application provide a CNC machine tool, including the aforementioned CNC rotary table.

[0016] The fixture for CNC rotary tables provided in the embodiments of this application is specifically designed for use in CNC rotary tables. This fixture possesses unique performance characteristics, enabling the CNC rotary table to utilize a linear encoder as a position feedback device. This significantly improves the positioning accuracy of the CNC rotary table, making it more precise. Furthermore, the fixture is independent of the CNC rotary table, making its installation and adjustment process simpler and faster. Due to these advantages, using this fixture can effectively improve work efficiency in the production process and ensure product quality, thereby bringing substantial improvements to the manufacturing industry. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0018] Figure 1 This illustration shows a structural diagram of a fixture and a CNC rotary table provided in an embodiment of this application.

[0019] Figure 2 This application provides a schematic diagram of the mandrel structure. Figure 1 ;

[0020] Figure 3 This application provides a schematic diagram of the mandrel structure. Figure 2 ;

[0021] Figure 4 This application provides a schematic diagram of the structure of the fixture base plate according to an embodiment. Figure 1 ;

[0022] Figure 5 This application provides a schematic diagram of the structure of the fixture base plate according to an embodiment. Figure 2 ;

[0023] Figure 6 This illustration shows a schematic diagram of the structure of the gasket provided in an embodiment of this application;

[0024] Figure 7 This application provides a schematic diagram of the structure of a locking nut according to an embodiment. Figure 1 ;

[0025] Figure 8 This application provides a schematic diagram of the structure of a locking nut according to an embodiment. Figure 2 .

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Mandrel;

[0028] 2. Jig bottom plate;

[0029] 3. Grating ruler;

[0030] 4. First sealing ring;

[0031] 5. Second sealing ring;

[0032] 6. Gaskets;

[0033] 7. Tighten the nut;

[0034] 8. Spindle;

[0035] 9. CNC rotary table. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In current industrial production, mechanical CNC rotary tables are widely used, typically relying on encoders on servo motors for position feedback. However, due to rotational errors, there is often a deviation between the actual rotation angle of the CNC rotary table and the angle fed back by the encoder. This deviation affects the consistency of the precision of the machined products, thus impacting product quality. To address this issue, two main solutions are available. First, one solution uses an integrated linear encoder, which is integrated into the center of the CNC rotary table's spindle. Utilizing the high precision of the linear encoder, the actual rotation angle of the CNC rotary table can be accurately output. However, this solution has the drawback of directly embedding the linear encoder inside the spindle, making installation complex and repair difficult in case of malfunction. Second, another solution uses a separate linear encoder. In this solution, the fixed encoder is installed inside the CNC rotary table's base, while the moving encoder is connected to the spindle. Accurate position information is fed back through a reading head. However, this solution also has its disadvantages, primarily related to safety. Because the reading head is highly sensitive, even tiny stains or dust can cause inaccurate data readings, thus affecting processing accuracy.

[0038] This application aims to solve at least one of the above-mentioned technical problems, and therefore provides a fixture for a CNC rotary table, a CNC rotary table and a CNC machine tool. When the fixture is applied to the CNC rotary table and the CNC machine tool, the installation space requirements of the CNC rotary table and the CNC machine tool are low, it is easy to debug and maintain, and the status of the grating ruler can be directly observed.

[0039] Specifically, such as Figures 1 to 8 As shown, this application embodiment provides a fixture for a CNC rotary table 9. The fixture is applied in the CNC rotary table 9 and structurally includes: a mandrel 1, a fixture base plate 2, and a grating ruler 3. The mandrel 1 is connected to the main spindle 8 set inside the CNC rotary table 9 and extends along the main spindle 8 set inside the CNC rotary table 9 to the outside of the CNC rotary table 9. The fixture base plate 2 is sleeved on the mandrel 1 and is set against the outer side wall of the CNC machine tool. The grating ruler 3 is sleeved on the mandrel 1 and clamped on the fixture base plate 2 for measuring the rotation angle in the CNC state.

[0040] In a specific example of this embodiment, such as Figure 1 As shown, this embodiment illustrates a specially designed fixture specifically designed for a CNC rotary table 9. It plays a crucial role in the use of the CNC rotary table 9, featuring a unique structural design comprising several key components. First, the fixture includes a mandrel 1, which is connected to the spindle 8 inside the CNC rotary table 9. The mandrel 1 is designed to extend along the direction of the spindle 8 inside the CNC rotary table 9, extending beyond the external boundaries of the CNC rotary table 9. This design not only ensures a tight fit between the fixture and the CNC rotary table 9 but also provides additional operating space.

[0041] Secondly, the fixture also includes a fixture base plate 2, which is fitted onto the mandrel 1. The fixture base plate 2 is designed to rest against the outer wall of the CNC machine tool, ensuring the stability and accuracy of the fixture. The installation position and method of the fixture base plate 2 are crucial to the overall performance of the fixture; it needs to be firmly fixed to the outer wall of the CNC machine tool to provide a stable platform.

[0042] Finally, the fixture also includes a linear encoder 3, which is also mounted on the mandrel 1 and clamped onto the fixture base plate 2. The main function of the linear encoder 3 is to measure and monitor the rotation angle of the CNC rotary table 9 during operation. Through precise measurement, the linear encoder 3 can provide real-time feedback information, which is crucial for ensuring the accurate operation and machining quality of the CNC rotary table 9. The accuracy and response speed of the linear encoder 3 directly affect the performance of the entire CNC system.

[0043] In summary, the fixture provided in this embodiment, through its unique structural design, not only improves the operating efficiency of the CNC rotary table 9 but also enhances the accuracy and stability during the machining process. Furthermore, the fixture provided in this example mounts the grating ruler 3 externally to the CNC rotary table 9, facilitating reading and maintenance. This fixture is particularly suitable for CNC machining applications requiring high precision and stability, providing users with a more reliable and efficient machining solution.

[0044] In one possible implementation, the fixture for the CNC rotary table 9 provided in this application embodiment further includes a first sealing ring 4, which is disposed between the mandrel 1 and the main spindle 8 disposed inside the CNC rotary table 9, for sealing the connection between the mandrel 1 and the main spindle 8 disposed inside the CNC rotary table 9.

[0045] In a specific example of this embodiment, such as Figure 1 As shown, the fixture for the CNC rotary table 9 provided in this embodiment also includes a first sealing ring 4. The first sealing ring 4 is designed and disposed between the mandrel 1 and the spindle 8 disposed inside the CNC rotary table 9. Its main function and role is to seal and protect the connection between the mandrel 1 and the spindle 8 disposed inside the CNC rotary table 9, ensuring that the connection part is not affected by oil and dust during operation, thereby improving the stability and service life of the entire CNC rotary table 9.

[0046] In one possible implementation, the fixture for the CNC rotary table 9 provided in this application embodiment further includes a second sealing ring 5, which is disposed between the fixture base plate 2 and the CNC rotary table 9 to seal the connection between the fixture base plate 2 and the CNC rotary table 9.

[0047] In a specific example of this embodiment, the fixture for the CNC rotary table 9 provided in this embodiment also includes a second sealing ring 5. This second sealing ring 5 is designed and disposed between the fixture base plate 2 and the CNC rotary table 9, and its main function is to ensure an effective seal at the connection between the fixture base plate 2 and the CNC rotary table 9. This design prevents the intrusion of liquids, dust, or other impurities during the fixture's operation, thereby further protecting the precision components of the CNC rotary table 9 from contamination and damage. Furthermore, the presence of the second sealing ring 5 also helps maintain a clean internal environment for the fixture, ensuring stable operation and extending its service life. This sealing measure not only improves the overall performance of the fixture but also enhances the reliability and safety of the CNC rotary table 9 under various operating conditions.

[0048] In one possible implementation, the fixture for the CNC rotary table 9 provided in this application embodiment further includes a gasket 6, which is sleeved on the mandrel 1 and abuts against the outer wall of the CNC rotary table 9.

[0049] In a specific example of this embodiment, such as Figure 1 and Figure 6 As shown, the fixture for the CNC rotary table 9 provided in this embodiment also includes a shim 6, which is sleeved on the mandrel 1 and abuts against the outer wall of the CNC rotary table 9. Specifically, the shim 6 is designed as a ring structure, which can tightly fit on the outer side of the mandrel 1 to ensure a good fit between it and the mandrel 1. In addition, the outer diameter of the shim 6 is slightly larger than the inner diameter of the CNC rotary table 9, so that after the shim 6 is sleeved on the mandrel 1, it can make close contact with the outer wall of the CNC rotary table 9, thereby playing a supporting and fixing role. In this way, the shim 6 can not only provide additional support points and reduce the vibration of the mandrel 1 during high-speed rotation, but also help to disperse the pressure borne by the CNC rotary table 9, thereby improving the stability and machining accuracy of the entire system.

[0050] In this embodiment, the material selection and design of the gasket 6 are also crucial. To ensure the gasket 6 maintains stability and durability during long-term use, materials with good mechanical properties and wear resistance are typically selected, such as high-strength alloy steel or carbon steel that has undergone special heat treatment. Furthermore, the surface of the gasket 6 may be hardened to further improve its wear resistance and corrosion resistance. In some cases, the surface of the gasket 6 may also be coated with a special lubricating coating to reduce friction with the outer wall of the CNC rotary table 9, thereby reducing wear and noise and improving the operating efficiency of the equipment.

[0051] In one possible implementation, the distance from the end face of the fixture base plate 2 to the bearing surface of the gasket 6 is denoted as A; the dimension of the positioning point of the grating ruler 3 is denoted as B; and the thickness of the gasket 6 is denoted as H; where H=AB.

[0052] In a specific example of this embodiment, it is necessary to measure and determine the specific distance from the end face of the fixture base plate 2 to the bearing surface of the shim 6, which is represented by the letter A. Next, attention should be paid to the dimension of the positioning point of the grating ruler 3, which is marked by the letter B. In addition, the thickness of the shim 6 is another important parameter, represented by the letter H. Based on these parameters, an important relationship can be derived: the thickness H of the shim 6 is equal to the distance A from the end face of the fixture base plate 2 to the bearing surface of the shim 6 minus the dimension B of the positioning point of the grating ruler 3, which can be described mathematically as H=AB.

[0053] To ensure the fitting accuracy between the fixture base plate 2 and the shim 6, the flatness of the end face of the fixture base plate 2 and the flatness of the surface of the shim 6 also need to be considered. The flatness error of the end face of the fixture base plate 2 should be controlled within a certain range to ensure uniformity when in contact with the shim 6. Similarly, the flatness of the surface of the shim 6 also needs to meet certain standards to avoid affecting the measurement accuracy of the grating ruler 3 due to unevenness. In addition, to further improve the overall assembly accuracy, appropriate adjusting shims 6 can be added between the shim 6 and the fixture base plate 2, and any possible minor errors can be compensated by fine-tuning the thickness of the shims 6.

[0054] In one possible implementation, the dimensional and positional tolerance of the mandrel 1 and the spindle 8 disposed within the CNC rotary table 9 is no greater than 0.02 mm.

[0055] In a specific example of this embodiment, the dimensional and positional tolerances of the mandrel 1 and the spindle 8 installed within the CNC rotary table 9 are precisely controlled to ensure that their values ​​are no greater than 0.02 mm. This stringent tolerance requirement is to guarantee the high precision of the fit between the mechanical components, thereby ensuring the stable operation and machining accuracy of the entire CNC rotary table 9 system. Specifically, the coaxiality tolerance between the mandrel 1 and the spindle 8 is no greater than 0.02 mm, ensuring the concentricity of the mandrel 1 and the spindle 8.

[0056] In one possible implementation, the fixture for the CNC rotary table 9 provided in this application embodiment further includes a locking nut 7, which is disposed at one end of the spindle 1 away from the main spindle 8 disposed inside the CNC rotary table 9, and is used to lock the spindle 1.

[0057] In a specific example of this embodiment, such as Figure 1 and Figure 7 , Figure 8 As shown, the fixture for the CNC rotary table 9 provided in this embodiment also includes a locking nut 7. The locking nut 7 is set at one end of the spindle 1 away from the main spindle 8 set inside the CNC rotary table 9. Its main function is to lock the spindle 1 to ensure that it remains stable during use and does not move or loosen unnecessarily, thereby improving the working efficiency and accuracy of the entire CNC rotary table 9.

[0058] Furthermore, the locking nut 7 in this embodiment is designed with ease of operation and safety in mind. It typically features an easy-to-use handle or knob, allowing the operator to easily rotate the nut to quickly lock or loosen the spindle 1. Simultaneously, to prevent loosening of the locking nut 7 under high-speed rotation or heavy load conditions, its design may also include anti-loosening structures, such as spring washers or special thread designs, ensuring a stable and reliable locking effect under various working environments.

[0059] In one possible implementation, the locking torque of the locking nut 7 is not less than 30 N·m.

[0060] In a specific example of this embodiment, the locking torque of the locking nut 7 is not less than 30 N·m. This design ensures that the nut provides sufficient friction during assembly, thereby effectively preventing loosening of the threaded connection during use. This high-torque locking nut 7 is particularly suitable for mechanical structures that need to withstand significant vibration and impact. By setting a minimum torque standard, the reliability of the connection can be guaranteed, maintenance costs reduced, and the service life of the equipment extended.

[0061] This application embodiment also provides a CNC rotary table 9, such as Figure 1 As shown, it includes: a spindle 8 and the aforementioned fixture for the CNC rotary table 9. The fixture is connected to the spindle 8 and extends outward along the spindle 8. This ensures sufficient installation space for the fixture and facilitates disassembly and maintenance.

[0062] This application also provides a CNC machine tool, including the CNC rotary table 9 described above.

[0063] The fixture for CNC rotary tables provided in the embodiments of this application is specifically designed for use in CNC rotary tables. This fixture possesses unique performance characteristics, enabling the CNC rotary table to utilize a linear encoder as a position feedback device. This significantly improves the positioning accuracy of the CNC rotary table, making it more precise. Furthermore, the fixture is independent of the CNC rotary table, making its installation and adjustment process simpler and faster. Due to these advantages, using this fixture can effectively improve work efficiency in the production process and ensure product quality, thereby bringing substantial improvements to the manufacturing industry.

[0064] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A fixture for a CNC rotary table, applied in a CNC rotary table, characterized in that, include: The mandrel is connected to the spindle inside the CNC rotary table and extends along the spindle inside the CNC rotary table to the outside of the CNC rotary table; A fixture base plate is fitted onto the mandrel and abuts against the outer wall of the CNC machine tool; and An optical grating ruler is fitted onto the mandrel and clamped onto the base plate of the fixture, and is used to measure the rotation angle in CNC mode.

2. The fixture for a CNC rotary table according to claim 1, characterized in that, Also includes: A first sealing ring is disposed between the mandrel and the main spindle disposed inside the CNC rotary table, and is used to seal the connection between the mandrel and the main spindle disposed inside the CNC rotary table.

3. The fixture for a CNC rotary table according to claim 1, characterized in that, Also includes: The second sealing ring is disposed between the fixture base plate and the CNC rotary table to seal the connection between the fixture base plate and the CNC rotary table.

4. The fixture for a CNC rotary table according to claim 1, characterized in that, Also includes: A gasket is fitted onto the mandrel and abuts against the outer wall of the CNC rotary table.

5. The fixture for a CNC rotary table according to claim 4, characterized in that, The distance from the end face of the fixture base plate to the bearing surface of the gasket is denoted as A; The dimension of the positioning point of the grating ruler is denoted as B; The thickness of the gasket is denoted as H; Where H = AB.

6. The fixture for a CNC rotary table according to claim 1, characterized in that, The dimensional and positional tolerance of the mandrel and the spindle set inside the CNC rotary table is no greater than 0.02mm.

7. The fixture for a CNC rotary table according to claim 1, characterized in that, Also includes: A locking nut is provided at one end of the mandrel away from the main spindle located inside the CNC rotary table, and is used to lock the mandrel.

8. The fixture for a CNC rotary table according to claim 7, characterized in that, The locking torque of the locking nut shall not be less than 30 N·m.

9. A CNC rotary table, characterized in that, include: spindle; The fixture for a CNC rotary table as described in any one of claims 1 to 8 is connected to the spindle and extends outward along the spindle.

10. A CNC machine tool, characterized in that, Including the CNC rotary table as described in claim 9.

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