A high-precision numerical control gear hobbing machine main tool holder tensioning structure

Abstract

The utility model relates to a high accuracy numerical control gear hobbing machine main tool rest tension structure is set up on the rotary disc of high accuracy numerical control gear hobbing machine, and the main tool rest is fixed in the rotary disc, including annular support, annular groove and first annular adjusting pad, annular support sets up on the rotary disc and is configured as with the fixed connection of rotation wheel, annular groove sets up on the rotary disc and is divided into upper sector groove and lower sector groove, a plurality of evenly distributed first tensioning members are equipped in the upper sector groove, a plurality of evenly distributed second tensioning members are equipped in the lower sector groove, one part of first annular adjusting pad sets up on annular support, another part is fixedly connected with rotation wheel, and first tensioning member and second tensioning member are all pressure -set on first annular adjusting pad and all are relative to first annular adjusting pad synchronous expansion and contraction to loosen or compact first annular adjusting pad. The utility model adopts the distribution of more upper and less lower tensioning member, alleviates the forward inclination state of main tool rest, and relative to the center of rotary disc, promotes the mass center position of main tool rest.

Description

Technical Field

[0001] This utility model relates to the field of CNC gear hobbing machine technology, specifically to a high-precision CNC gear hobbing machine main tool holder tensioning structure. Background Technology

[0002] With the rapid development of the machine tool industry, there are higher requirements for the precision and stability of machine tools. As an important processing equipment for gears and worm gears, the precision and stability of gear hobbing machines directly determine whether the parts meet the requirements, and also affect the precision of other machine tools.

[0003] Currently, the main tool holder on a CNC gear hobbing machine is usually fixed on a rotary table. The drive mechanism drives the rotary table to rotate, which in turn drives the main tool holder to rotate. After the rotary table and the main tool holder rotate together to a preset angle, multiple tensioning elements evenly surrounding the main tool holder tighten the rotary table, thereby tightening the main tool holder.

[0004] However, during the stress analysis of the CNC gear hobbing machine, it was found that due to the large mass of the main tool post, if the rotary table is tightened by multiple tensioning components evenly surrounding the main tool post, the main tool post will be in a forward tilting state, and the center of mass of the main tool post will be lower than the center of the rotary table, which reduces the machining accuracy of the gears. Utility Model Content

[0005] Based on the above description, this utility model provides a high-precision CNC gear hobbing machine main tool holder tensioning structure, which adopts a tensioning component distribution with more at the top and fewer at the bottom to reduce the forward tilt of the main tool holder and raise the center of gravity of the main tool holder relative to the center of the rotary table.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A high-precision CNC gear hobbing machine main tool holder tensioning structure is installed on the rotary table of the high-precision CNC gear hobbing machine, and the main tool holder is fixed to the rotary table, comprising:

[0008] An annular support member is mounted on the rotary table and configured to be fixedly connected to the rotating wheel;

[0009] An annular groove is provided on the turntable and divided into an upper sector-shaped groove and a lower sector-shaped groove. The upper sector-shaped groove contains a plurality of evenly distributed first tensioning members, and the lower sector-shaped groove contains a plurality of evenly distributed second tensioning members. The included angle between two adjacent first tensioning members is smaller than the included angle between two adjacent second tensioning members.

[0010] The first annular adjusting pad is partially set on the annular support member and the other part is fixedly connected to the rotating wheel;

[0011] In this configuration, a plurality of the first tensioning members and a plurality of the second tensioning members are pressed onto the first annular adjusting pad, and all of them extend and retract synchronously relative to the first annular adjusting pad to loosen or tighten the first annular adjusting pad.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Both the first tensioning member and the second tensioning member are tensioning cylinders. The tensioning cylinder includes a cylinder seat, a piston rod, a tensioning block, and a disc spring. The cylinder seat is located in the upper sector groove or the lower sector groove and is fixed to the rotary table. The disc spring is located in the cylinder seat. The tensioning block is fixed to the piston rod by a tensioning screw and is pressed onto the first annular adjusting pad.

[0014] Furthermore, the annular support includes a first annular support portion and a second annular support portion arranged concentrically, the radius of the first annular support portion is larger than the radius of the second annular support portion, and the first annular support portion, the second annular support portion and the rotary table form an annular groove.

[0015] Furthermore, a portion of the first annular adjusting pad is disposed on the first annular support portion, and the other portion is fixedly connected to the rotating wheel.

[0016] Furthermore, it also includes a second annular adjusting pad, which is disposed on the second annular support portion, and the height difference between the second annular adjusting pad and the first annular adjusting pad is less than or equal to 0.015.

[0017] Furthermore, the first annular support portion includes a plurality of first support plates, and a portion of the first annular adjusting pad is disposed on the plurality of first support plates;

[0018] The second annular support portion includes a plurality of second support plates, and the second annular adjusting pad is disposed on the plurality of second support plates;

[0019] There is a certain distance between two adjacent first support plates and / or second support plates, and each of the first tensioning member or the second tensioning member is pressed onto one of the first support plates and one of the second support plates.

[0020] Furthermore, when the distance between the center of mass of the main tool holder and the center of the rotary table is greater than a preset threshold, the difference between the central angles of the upper and lower sector grooves and / or the difference between the number of the first and second tensioning members are increased.

[0021] Furthermore, the rotating wheel is a turbine, and the high-precision CNC gear hobbing machine is equipped with a worm and a drive component for driving the worm to rotate, wherein the worm and the turbine mesh.

[0022] Furthermore, the cylinder seat includes a first mating surface, and the rotary table includes a second mating surface. The first mating surface and the second mating surface are mated together, and the parallelism tolerance is less than or equal to 0.02.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0024] This embodiment provides a high-precision CNC gear hobbing machine main tool holder tensioning structure. An upper sector groove and a lower sector groove are provided on the rotary table. A number of first tensioning members are evenly distributed in the upper sector groove, and a number of second tensioning members are evenly distributed in the lower sector groove. The number of first tensioning members is greater than the number of second tensioning members. This embodiment adopts a tensioning member distribution with more members at the top and fewer at the bottom to reduce the forward tilt of the main tool holder and raise the center of gravity of the main tool holder relative to the center of the rotary table. Attached Figure Description

[0025] Figure 1 A schematic diagram of a high-precision CNC gear hobbing machine main tool holder tensioning structure provided in this embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the external structure of the rotary table;

[0027] Figure 3 This is a schematic diagram of the first cross-sectional structure of the rotary table;

[0028] Figure 4 This is a schematic diagram of the tensioning cylinder structure;

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 100. High-precision CNC gear hobbing machine; 110. Guide rail; 111. Fourth mating surface; 120. Slide body; 121. Third mating surface; 130. Rotary table; 131. Annular support; 1311. First annular support; 13111. First support plate; 1312. Second annular support; 13121. Second support plate; 1313. Mounting groove; 132. Annular groove; 1321. Upper sector groove; 1322. Lower sector groove; 133. First 134. Annular adjusting shim; 135. Second annular adjusting shim; 136. Rotating wheel; 137. Worm gear; 138. First tensioning element; 139. Cylinder seat; 130. First contact surface; 140. Piston rod; 150. Tensioning block; 161. Disc spring; 172. Tensioning screw; 18. Second tensioning element; 19. Second contact surface; 10. Main tool holder; 111. Rotating shaft; 122. Tapered roller bearing; 133. Mechanical clamping structure. Detailed Implementation

[0031] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0034] In related technologies, the change in the center of gravity of the load (main tool post 140) is ignored in the traditional high-precision CNC gear hobbing machine 100, and the tensioning parts are uniformly distributed. According to the force state analysis of the high-precision CNC gear hobbing machine 100, the load (main tool post 140) part is in a "forward tilting" state, and the center of gravity of the main tool post 140 is higher than the center position of the rotary table 130.

[0035] like Figures 1-4 As shown, in order to overcome the "forward tilt" state of the main tool holder 140 during the processing and reduce the degree to which the center of gravity of the main tool holder 140 is lower than the center of the rotary table 130, the tensioning components are distributed with more at the top and fewer at the bottom. This embodiment provides a high-precision CNC gear hobbing machine main tool holder tensioning structure, which is set on the rotary table 130 of the high-precision CNC gear hobbing machine 100. The main tool holder 140 is fixed to the rotary table 130 and includes an annular support 131, an annular groove 132 and a first annular adjusting pad 133.

[0036] An annular support 131 is disposed on a rotary table 130 and configured to be fixedly connected to a rotating wheel 135. An annular groove 132 is disposed on the rotary table 130 and is divided into an upper sector groove 1321 and a lower sector groove 1322. The upper sector groove 1321 is provided with a plurality of evenly distributed first tensioning members 137, and the lower sector groove 1322 is provided with a plurality of evenly distributed second tensioning members 138. The included angle between two adjacent first tensioning members 137 is smaller than the included angle between two adjacent second tensioning members 138.

[0037] The first annular adjusting pad 133 is partly mounted on the annular support 131 and the other part is fixedly connected to the rotating wheel 135.

[0038] Among them, a number of first tensioning members 137 and a number of second tensioning members 138 are pressed on the first annular adjusting pad 133, and all of them extend and retract synchronously relative to the first annular adjusting pad 133 to relax or tighten the first annular adjusting pad 133.

[0039] This embodiment provides a high-precision CNC gear hobbing machine main tool holder tensioning structure. An annular groove 132 is provided on the rotary table 130, and the annular groove 132 is divided into an upper fan-shaped groove 1321 and a lower fan-shaped groove 1322. A plurality of first tensioning members 137 are evenly distributed in the upper fan-shaped groove 1321, and a plurality of second tensioning members 138 are evenly distributed in the lower fan-shaped groove 132. The included angle between two adjacent first tensioning members 137 is smaller than the included angle between two adjacent second tensioning members 138, so that the annular groove 132 forms a tensioning member distribution with more members at the top and fewer at the bottom, which reduces the forward tilt of the main tool holder 140 and raises the center of gravity of the main tool holder 140 relative to the center of the rotary table 130.

[0040] This embodiment provides a high-precision CNC gear hobbing machine main tool holder tensioning structure. During use, when adjusting the angle of the main tool holder 140, several first tensioning members 137 and several second tensioning members 138 simultaneously extend relative to the first annular adjusting pad 133 to loosen the first annular adjusting pad 133, thereby loosening the rotating wheel 135. By driving the rotating wheel 135 to rotate, the annular support member 131 and the rotary table 130 are driven to rotate, thereby driving the main tool holder 140 to rotate to adjust the angle of the main tool holder 140. After the angle of the main tool holder 140 is adjusted, several first tensioning members 137 and several second tensioning members 138 simultaneously shorten relative to the first annular adjusting pad 133 to press the first annular adjusting pad 133, thereby pressing the rotating wheel 135. At this time, the rotating wheel 135 cannot drive the annular support member 131 and the rotary table 130 to rotate, thus tightening the main tool holder 140.

[0041] In this embodiment, as Figures 2-4 As shown, both the first tensioning member 137 and the second tensioning member 138 are tensioning cylinders. The tensioning cylinder includes a cylinder seat 1371, a piston rod 1372, a tensioning block 1373, and a disc spring 1374. The cylinder seat 1371 is located in the upper sector groove 1321 or the lower sector groove 1322 and is fixed to the rotary table 130. The disc spring 1374 is located inside the cylinder seat 1371. The tensioning block 1373 is fixed to the piston rod 1372 by a tensioning screw 1375. The tensioning block 1373 is pressed onto the first annular adjusting pad 133.

[0042] During use, by applying or depressurizing the cylinder seat 1371, the disc spring 1374 inside the cylinder seat 1371 deforms, pushing the piston rod 1372 up or down, which in turn pushes the tension screw 1375 and tension block 1373 up or down, thereby loosening or tightening the first annular adjusting pad 133 and rotating wheel 135. Furthermore, to ensure that the first annular adjusting pad 133 and rotating wheel 135 are tightened, after depressurization, the tension screw 1375 and / or disc spring 1374 still provide partial preload to tighten the piston rod 1372.

[0043] In this embodiment, as Figure 2 As shown, based on the distance between the center of mass of the main tool holder 140 and the center of the rotary table 130, the difference in the central angles of the upper sector groove 1321 and the lower sector groove 1322 and / or the difference in the number of the first tensioning member 137 and the second tensioning member 138 are adjusted to reduce the degree to which the center of mass of the main tool holder 140 is lower than the center of the rotary table 130, ensuring that the center of the rotary table 130 is parallel or coaxial with the center of mass of the main tool holder 140.

[0044] Specifically, when the distance between the center of mass of the main tool holder 140 and the center of the rotary table 130 is greater than a preset threshold, the difference between the central angles of the upper sector groove 1321 and the lower sector groove 1322 and / or the difference between the number of the first tensioning member 137 and the second tensioning member 138 are increased.

[0045] In this embodiment, as Figures 2-4 As shown, the annular support 131 includes a first annular support portion 1311 and a second annular support portion 1312 arranged concentrically. The radius of the first annular support portion 1311 is larger than the radius of the second annular support portion 1312. The first annular support portion 1311, the second annular support portion 1312 and the rotary disk 130 form an annular groove 132. The annular groove 132 is divided into an upper fan-shaped groove 1321 and a lower fan-shaped groove 1322. The sum of the central angle of the upper fan-shaped groove 1321 and the central angle of the lower fan-shaped groove 1322 is 360 degrees.

[0046] In one specific implementation of this embodiment, such as Figure 2 Finite element analysis verified that the central angle of the upper sector groove 1321 is 180 degrees, the central angle of the lower sector groove 1322 is 180 degrees, the included angle between two adjacent first tensioning members 137 is smaller than the included angle between two adjacent second tensioning members 138, the number of first tensioning members 137 is 7, and the number of second tensioning members 138 is 5, ensuring that the center of mass of the main tool holder 140 is on the central axis of the rotary table 130. At the same time, in order to overcome the vibration of the rotary table 130 during the processing, a mechanical clamping structure 170 is added. After the angle of the main tool holder 140 is adjusted, mechanical clamping is achieved by locking the rotary table 130 with screws.

[0047] In this embodiment, as Figure 3 and Figure 4 As shown, a portion of the first annular adjusting pad 133 is disposed on the first annular support portion 1311, and the other portion is fixedly connected to the rotating wheel 135 by screws.

[0048] In this embodiment, as Figure 3 and Figure 4 As shown, in order to prevent the tensioning block 1373 from tilting, a second annular adjusting pad 134 is also included, which is disposed on the second annular support 1312 and connected to the second annular support 1312 by screws, and the height difference between the second annular adjusting pad 134 and the first annular adjusting pad 133 is less than or equal to 0.015.

[0049] In this embodiment, both the first annular adjusting pad 133 and the second annular adjusting pad 134 are made of flexible materials, such as rubber, and this embodiment does not limit the materials used.

[0050] In this embodiment, the main tool holder 140 and the rotary table 130 are positioned by a stop and fixedly connected by screws.

[0051] In this embodiment, as Figures 2-4 As shown, in order to facilitate the installation of oil pipes, the annular support 131 is provided with a number of installation slots 1313. Each installation slot 1313 is located between two adjacent first tension members 137 and / or second tension members 138. Construction personnel can install oil pipes on the cylinder seat 1371 through the installation slots 1313.

[0052] In the specific implementation of this embodiment, as follows: Figures 2-4 As shown, the first annular support portion 1311 includes a plurality of first support plates 13111, and a portion of the first annular adjusting pad 133 is disposed on the plurality of first support plates 13111.

[0053] The second annular support 1312 includes several second support plates 13121, and the second annular adjusting pad 134 is disposed on several second support plates 13121.

[0054] There is a certain distance between two adjacent first support plates 13111 and / or second support plates 13121 to form an installation groove 1313, which facilitates the installation of oil pipes by construction personnel. The oil pipes include an inlet pipe and an outlet pipe, and both the inlet pipe and the outlet pipe are connected to the cylinder seat 1371. Each first tensioning member 137 or second tensioning member 138 is pressed onto a first support plate 13111 and a second support plate 13121.

[0055] In this embodiment, as Figure 2As shown, both the first support plate 13111 and the second support plate 13121 are arc-shaped.

[0056] In this embodiment, as Figure 3 As shown, the rotating wheel 135 is a turbine, and the high-precision CNC gear hobbing machine 100 is equipped with a worm 136 and a drive component that drives the worm 136 to rotate. The worm 136 meshes with the turbine.

[0057] In this embodiment, the high-precision CNC gear hobbing machine 100 is equipped with two worm gears 136. Each worm gear 136 is driven to rotate by a driving component, which is a motor. The two worm gears 136 are symmetrically arranged relative to the rotating disk. By simultaneously driving the two worm gears 136 to rotate, the rotating wheel 135 rotates, which in turn drives the rotary disk 130 and the main tool holder 140 to rotate, thereby adjusting the angle of the main tool holder 140.

[0058] In this embodiment, as Figures 1-3 As shown, the high-precision CNC gear hobbing machine 100 also includes a guide rail 110 and a slide body 120. The slide body 120 is slidably connected to the guide rail 110. The rotary table 130 is fixed to the slide body 120 via a rotating shaft 150. Both ends of the rotating shaft 150 are supported and positioned by tapered roller bearings 160 and the slide body 120 and the rotary table 130. Two servo motors drive two worm gears 136 to make the rotary table 130 rotate ±30° around the center of the shaft hole of the slide body 120. During the machining process, the non-... The first tensioning member 137 and the second tensioning member 138, which are evenly distributed, are tightened, and the rotary table 130 is locked by mechanical limiters to ensure the rigidity and stability of the main tool holder 140 during the processing. This allows the hobbing and internal milling of gear rings to achieve a precision level of within grade 7. While ensuring the rigidity of the high-precision CNC gear hobbing machine 100 itself, the structure also makes the processing performance more stable, greatly reducing the errors in tooth profile, tooth direction, and tooth pitch during the processing of gear rings and worm gears, improving the overall machine precision, and realizing the openness of the structural space.

[0059] like Figure 3 As shown, the cylinder seat 1371 includes a first mating surface 13711, and the rotary table 130 includes a second mating surface 139. The first mating surface 13711 and the second mating surface 139 are mated together and the parallelism tolerance is less than or equal to 0.02.

[0060] like Figure 1 As shown, the slide body 120 includes a third mating surface 121, and the guide rail 110 includes a fourth mating surface 111. The third mating surface 121 and the fourth mating surface 111 are mated together and the parallelism tolerance is less than or equal to 0.02, and the surface finish requirement is met. Through vibration analysis and experimental verification, the vibration problem in the hobbing / milling process is effectively suppressed.

[0061] In this embodiment, as Figure 2As shown, it also includes a mechanical clamping structure 170, which is used to lock the rotary table 130. When the main tool post 140 is tightened and in a fixed state, the rotary table 130 is locked by the mechanical clamping structure 170 to achieve secondary fixation and avoid damage to the machine tool and workpiece due to changes in oil pressure. The mechanical clamping structure 170 is a bolt.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tensioning structure for the main tool holder of a high-precision CNC gear hobbing machine, wherein the main tool holder is fixed to the rotary table of the high-precision CNC gear hobbing machine, characterized in that, include: An annular support member is mounted on the rotary table and configured to be fixedly connected to the rotating wheel; An annular groove is provided on the turntable and divided into an upper sector-shaped groove and a lower sector-shaped groove. The upper sector-shaped groove contains a plurality of evenly distributed first tensioning members, and the lower sector-shaped groove contains a plurality of evenly distributed second tensioning members. The included angle between two adjacent first tensioning members is smaller than the included angle between two adjacent second tensioning members. The first annular adjusting pad is partially set on the annular support member and the other part is fixedly connected to the rotating wheel; In this configuration, a plurality of the first tensioning members and a plurality of the second tensioning members are pressed onto the first annular adjusting pad, and all of them extend and retract synchronously relative to the first annular adjusting pad to loosen or tighten the first annular adjusting pad.

2. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 1, characterized in that: Both the first tensioning member and the second tensioning member are tensioning cylinders. The tensioning cylinder includes a cylinder seat, a piston rod, a tensioning block, and a disc spring. The cylinder seat is located in the upper sector groove or the lower sector groove and is fixed to the rotary table. The disc spring is located in the cylinder seat. The tensioning block is fixed to the piston rod by a tensioning screw and is pressed onto the first annular adjusting pad.

3. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 1, characterized in that: The annular support includes a first annular support portion and a second annular support portion arranged concentrically. The radius of the first annular support portion is larger than the radius of the second annular support portion. The first annular support portion, the second annular support portion, and the rotary table form an annular groove.

4. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 3, characterized in that: One part of the first annular adjusting pad is disposed on the first annular support, and the other part is fixedly connected to the rotating wheel.

5. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 4, characterized in that, Also includes: The second annular adjusting pad is disposed on the second annular support portion, and the height difference between the second annular adjusting pad and the first annular adjusting pad is less than or equal to 0.

015.

6. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 5, characterized in that: The first annular support portion includes a plurality of first support plates, and a portion of the first annular adjusting pad is disposed on the plurality of first support plates; The second annular support portion includes a plurality of second support plates, and the second annular adjusting pad is disposed on the plurality of second support plates; There is a certain distance between two adjacent first support plates and / or second support plates, and each of the first tensioning member or the second tensioning member is pressed onto one of the first support plates and one of the second support plates.

7. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 1, characterized in that: When the distance between the center of mass of the main tool holder and the center of the rotary table is greater than a preset threshold, the difference between the central angles of the upper and lower sector grooves and / or the difference between the number of the first and second tensioning members are increased.

8. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 1, characterized in that: The rotating wheel is a turbine, and the high-precision CNC gear hobbing machine is equipped with a worm and a drive component that drives the worm to rotate. The worm and the turbine mesh.

9. The high-precision CNC gear hobbing machine main tool holder tensioning structure according to claim 2, characterized in that: The cylinder seat includes a first mating surface, and the rotary table includes a second mating surface. The first mating surface and the second mating surface are mated together and the parallelism tolerance is less than or equal to 0.02.

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