A gear grinding jig and method of using the same

Abstract

This application discloses a gear grinding fixture, relating to the field of machining technology, comprising: a chuck, with multiple guide grooves evenly distributed on the upper surface of the chuck, the guide grooves being coaxial with the chuck; a flange; a positioning plate, with positioning grooves at both ends of the positioning plate, the two ends of the positioning grooves being parallel to the positioning plate, and the middle of the positioning groove being an upwardly protruding arc shape; a jaw, the jaw comprising: a first sliding part disposed in the guide groove; a second sliding part disposed in the positioning groove; and an engaging part; by setting the guide groove and the positioning groove, the arc shape of the positioning groove can tilt the jaw, so that only one part of the surface contacts the workpiece initially, and the guide groove being coaxial with the chuck can gradually push the jaw outward, automatically pushing the workpiece to a position coaxial with the chuck, thus solving the problem that the gear grinding fixture cannot automatically adjust the workpiece position when holding the workpiece, and enabling the gear grinding fixture to automatically adjust the workpiece position when holding the workpiece.

Description

Technical Field

[0001] This application relates to the field of machining technology, and in particular to a gear grinding fixture. Background Technology

[0002] Gear grinding is a process that uses grinding wheels and other abrasive tools to process the tooth surfaces of cylindrical gears or certain gears (helical gears, bevel gears, etc.). It is mainly used to eliminate deformation after heat treatment and improve gear precision. A gear grinding machine is a metal cutting machine tool used for gear finishing. It uses a grinding wheel as a cutting tool to grind the already machined gear tooth surfaces to improve gear precision and surface finish. It is suitable for finishing gears made of steel with high hardness after quenching. In the gear grinding process, the precision requirements of gear parts are generally very high (reaching GB 6 level or higher). Apart from the error caused by the thermal deformation of the parts themselves, the fixture is one of the main factors affecting the grinding precision.

[0003] In existing technologies, gears are fixed using expansion sleeve or three-jaw chuck fixtures. However, these fixtures have accuracy issues. The main problems are that the expansion and contraction characteristics of the sleeve and the positioning accuracy of the jaws are not high when clamping the gears. The gear clamping is unstable, resulting in uneven clamping force, which affects the accuracy of gear processing. This also means that the fixture needs to spend a lot of time clamping, adjusting and setting up the workpiece, which reduces the efficiency of the production line and increases production costs.

[0004] Therefore, we need a gear grinding fixture to solve the problem that the gear grinding fixture cannot adjust the position of the workpiece itself when holding the workpiece, so that the gear grinding fixture can adjust the position of the workpiece itself when holding the workpiece. Summary of the Invention

[0005] The purpose of this application is to solve the problem that the grinding fixture cannot adjust the position of the workpiece itself when holding the workpiece. In order to solve the above problem, this application provides a grinding fixture that can adjust the position of the workpiece itself when holding the workpiece.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: a chuck, wherein the chuck is cylindrical, and multiple guide grooves are evenly distributed on the upper surface of the chuck, the number of guide grooves being greater than or equal to three, the guide grooves being arc-shaped, and the guide grooves being coaxial with the chuck; a flange, wherein the flange is disposed on the outer ring of the chuck, and the flange is coaxial with the chuck; a positioning plate, wherein the positioning plate is disposed on the upper surface of the flange, and the positioning plate is fixedly connected to the flange, the number of positioning plates being the same as the number of guide grooves, positioning grooves being provided at both ends of the positioning plate, the positioning grooves being located at the upper end of the guide grooves, one end face of the positioning groove being parallel to the positioning plate, and the middle of the positioning groove being an upwardly protruding arc shape; a jaw, wherein the jaw is disposed on the upper end of the chuck, the number of jaws being the same as the number of guide grooves, and the jaw includes: a first sliding part, wherein the first sliding part is disposed at the lower end of the jaw, the first sliding part being disposed within the guide groove, and the width of the first sliding part being the same as the width of the guide groove; and a second sliding part, wherein the second sliding part is located above the first sliding part, and the second sliding part being disposed within the positioning groove; The meshing part is located at the upper end of the second sliding part; the positioning plate receives the workpiece, the chuck rotates, and the chuck drives the jaws to move along the movement trajectory of the guide groove and the positioning groove. When the jaws are moved to the middle of the positioning groove, the meshing part gradually tilts, the upper end of the meshing part initially contacts the workpiece and pushes it outward. When the jaws are moved to one end, all the meshing parts are fully engaged with the workpiece.

[0007] In the above technical solution, the embodiment of this application achieves this by: setting a guide groove and a positioning groove. The arc-shaped setting of the positioning groove can tilt the jaws, so that only one part of the surface will be in contact with the workpiece when it first contacts it. The guide groove and the chuck are set on opposite axes, which can push the jaws outward step by step and push the workpiece to a position coaxial with the chuck. This allows the gear grinding fixture to adjust the position of the workpiece itself when clamping the workpiece.

[0008] Furthermore, according to an embodiment of this application, the length of the positioning groove is greater than or equal to the arc of the guide groove.

[0009] Furthermore, according to the embodiments of this application, the movement trajectory of the positioning groove is the same as that of the guide groove, the groove shape of the guide groove is set to semi-circular, and the corners of the guide groove are all rounded.

[0010] Furthermore, according to an embodiment of this application, the lower end of the second sliding portion has the same shape as the groove of the guide groove.

[0011] Furthermore, according to an embodiment of this application, a plurality of threaded holes are evenly distributed on the upper end of the flange.

[0012] Furthermore, according to an embodiment of this application, the positioning plate is provided with two or more stepped holes, and the positioning plate and the flange are fixedly connected by screws.

[0013] Furthermore, according to an embodiment of this application, the positioning discs are evenly distributed on the upper surface of the flange, and the positioning grooves are arranged in pairs.

[0014] Furthermore, according to an embodiment of this application, the second sliding part is disposed between two positioning grooves.

[0015] Furthermore, according to an embodiment of this application, the two ends of the meshing portion are arc-shaped, and the surface of the meshing portion is wavy.

[0016] Further, according to an embodiment of this application, the chuck is rotated clockwise, displacing the jaws through the guide groove and positioning groove to the first position closest to the center of the chuck; the workpiece is placed on the upper surface of the positioning plate, and the chuck is rotated counterclockwise, gradually tilting as it passes through the middle of the positioning groove; the upper surface of the meshing part initially contacts the workpiece, and the chuck is rotated counterclockwise again, pushing the workpiece outward along the movement trajectory of the guide groove and positioning groove; when all meshing parts are in contact with the workpiece and the contact area is the same, the workpiece and the chuck are coaxial; when the jaws are displaced to the second position at the outermost end of the guide groove and positioning groove, the meshing part and the workpiece are fully engaged, completing the assembly.

[0017] Compared with the prior art, this application has the following beneficial effects: By setting guide groove and positioning groove, the arc-shaped positioning groove can tilt the jaws, so that only one part of the surface will be in contact with the workpiece when it first contacts the workpiece. The guide groove and the chuck are set on opposite axes, which can push the jaws outward step by step and push the workpiece to the coaxial position with the chuck. This solves the problem that the gear grinding fixture cannot adjust the position of the workpiece when holding the workpiece. It can enable the gear grinding fixture to adjust the position of the workpiece when holding the workpiece. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is an isometric drawing of a gear grinding fixture.

[0020] Figure 2 This is a top view of a gear grinding fixture.

[0021] Figure 3 This is a top view of a chuck for a gear grinding fixture.

[0022] Figure 4 This is a magnified view of a gear grinding fixture.

[0023] Figure 5 This is a cross-sectional view of the first position of the jaws of a gear grinding jig, shown in the figure "AA".

[0024] Figure 6 This is a cross-sectional view ("AA") of the initial contact position of the jaws of a gear grinding fixture with the workpiece.

[0025] Figure 7 This is a cross-sectional view of the second position of the jaws of a gear grinding jig, shown in the figure "AA".

[0026] Figure 8 This is a motion trajectory diagram of the positioning groove after an improvement of a gear grinding fixture.

[0027] Figure 9 This is a motion trajectory diagram of the guide groove after an improvement of a gear grinding fixture.

[0028] Figure 10 This is a cross-sectional view ("AA") of the first position of the jaws in an improved gear grinding clamp.

[0029] In the attached diagram: 1. Chuck, 11. Guide groove, 2. Flange, 3. Positioning plate, 31. Positioning groove, 4. Claw, 41. First sliding part, 42. Second sliding part, 43. Engaging part, 5. First position, 6. Second position, 7. Gear disk, 8. Gear shaft. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and apparatus have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0034] Example 1: As Figure 1-7 As shown, a gear grinding fixture includes: Chuck 1, the chuck 1 is cylindrical, and multiple guide grooves 11 are evenly distributed on the upper surface of chuck 1. The number of guide grooves 11 is greater than or equal to three. The guide grooves 11 are arc-shaped and are set on a different axis from chuck 1. Flange 2, flange 2 is set on the outer ring of chuck 1. Flange 2 is set on the same axis as chuck 1. The different axis setting of guide grooves 11 and chuck 1 allows jaws 4 to move smoothly from the inside to the outside and can adjust the workpiece to be processed to a position on the same axis as chuck 1. Positioning disc 3 is mounted on the upper surface of flange 2 and is fixedly connected to flange 2. The number of positioning discs 3 is the same as the number of guide grooves 11. Positioning grooves 31 are provided at both ends of positioning disc 3. Positioning grooves 31 are located at the upper end of guide grooves 11 and are parallel to positioning disc 3 at both ends. The middle part of positioning groove 31 is an upwardly protruding arc-shaped claw 4, which is located at the upper end of chuck 1. The number of claws 4 is the same as the number of guide grooves 11. Claw 4 includes: a first sliding part 41, which is located at the lower end of claw 4. A sliding part 41 is disposed in the guide groove 11, and the width of the first sliding part 41 is the same as the width of the guide groove 11; a second sliding part 42 is located above the first sliding part 41 and is disposed in the positioning groove 31; an engaging part 43 is located above the second sliding part 42. By setting the first sliding part 41 and the second sliding part 42, the chuck can be fixed in the guide groove 11 and the positioning groove 31 at the same time, ensuring that it will only move along the movement trajectory of the guide groove 11 and the positioning groove 31 to adjust the position of the workpiece.

[0035] The positioning disk 3 receives the workpiece, and the chuck 1 rotates. The chuck 1 drives the jaws 4 to move along the movement trajectory of the guide groove 11 and the positioning groove 31. When the jaws 4 move to the middle of the positioning groove 31, the meshing part 43 gradually tilts. The upper end of the meshing part 43 initially contacts the workpiece and pushes it outward. When the jaws 4 move to one end, all the meshing parts 43 are fully engaged with the workpiece. The middle of the positioning groove 31 is set in an upward protruding arc shape, which can make the jaws 4 tilt. When the jaws 4 initially contact the workpiece, only a part of the meshing part 43 will contact the workpiece and push outward or inward on its own. It will not cause the first two meshing parts 43 to jam due to the excessive meshing surface when the workpiece is placed and the axis of the chuck 1 is too large, so that the jaws 4 cannot move further and need to be readjusted. This achieves the goal of not spending too much time in the adjustment and setting process. The fixture can be adjusted by itself through the positioning groove 31 and the guide groove 11.

[0036] The length of the positioning groove 31 is greater than or equal to the curvature of the guide groove 11. The movement trajectory of the positioning groove 31 is the same as that of the guide groove 11. The same movement trajectory ensures that the chuck 4 can move in sync with the guide groove 11 and the positioning groove 31, making self-adjustment smoother and preventing jamming. The guide groove 11 is set to a semi-circular shape, and the corners of the guide groove 11 are rounded. The lower end of the second sliding part 42 has the same shape as the guide groove 11. The positioning groove 31 is set to a semi-circular shape and rounded corners, which allows the chuck 4 to tilt smoothly left and right according to the curvature of the positioning groove 31 when tilted.

[0037] The upper end of the flange 2 has multiple threaded holes evenly distributed. The positioning plate 3 has two or more stepped holes. The positioning plate 3 is fixedly connected to the flange 2 by screws. The positioning plates 3 are evenly distributed on the upper end face of the flange 2. The positioning grooves 31 are set in pairs. Fixing the flange 2 and the positioning plate 3 with screws can make the chuck 4 only move back and forth, ensuring the stability of the chuck 4 when adjusting the workpiece axis.

[0038] The second sliding part 42 is disposed between the two positioning grooves 31, the two ends of the meshing part 43 are arc-shaped, and the surface of the meshing part 43 is wavy.

[0039] Example 2: Figure 5-7 As shown, based on Embodiment 1, this embodiment further improves the meshing part 43 by setting the upper end of the meshing part 43 to protrude to one end. Since the middle part of the positioning groove 31 is set to a protruding arc, when the chuck 4 continues to move outward after passing the middle section, the chuck 4 will move downward. By setting the upper end of the meshing part 43 to protrude to one end, the radial distance of the workpiece can be further adjusted to prevent the gear disk 7 from jumping during processing. In addition, the surface of the meshing part 43 is set to a wavy structure to increase the friction force. Because of the wavy structure, the workpiece will not get stuck when the chuck 4 is tilted to adjust the workpiece position.

[0040] Example 3: Figure 1-9 As shown, based on Embodiments 1-2, this embodiment also provides a method for using a gear grinding fixture, including: Rotating the chuck 1 clockwise moves the jaw 4 through the guide groove 11 and the positioning groove 31 to the first position 5 near the center of the chuck 1. When the jaw 4 is pushed to the near end, the gear disk 7 can be placed easily without much adjustment. Place the gear disk 7 on the upper surface of the positioning disk 3, and rotate the chuck 1 counterclockwise. The chuck 1 gradually tilts as it passes through the middle of the positioning groove 31. When the upper end face of the meshing part 43 initially contacts the gear disk 7, and the chuck 1 continues to rotate counterclockwise, the meshing part 43 pushes the gear disk 7 outward along the movement trajectory of the guide groove 11 and the positioning groove 31. When all the meshing parts 43 are in contact with the gear disk 7 and the contact area is the same, the gear disk 7 and the chuck 1 are coaxial. When the chuck 4 moves to the second position 6 at the outermost end of the guide groove 11 and the positioning groove 31, the meshing part 43 fully meshes with the gear disk 7, completing the assembly. By setting the guide groove 11 and the positioning groove 31, the arc-shaped setting of the positioning groove 31 can tilt the chuck 4. When initially contacting the gear disk 7, only one part of the surface will be in contact. The guide groove 11 and the chuck 1 are set on opposite axes, which can push the chuck 4 outward step by step, pushing the gear disk 7 to a position coaxial with the chuck 1. This allows the gear grinding fixture to adjust itself when clamping the gear disk 7.

[0041] Example 4: Figure 8-9 As shown, based on Embodiment 1, this embodiment further improves the positioning groove 31. A portion of the positioning groove 31 is provided on both ends of the positioning groove 31 parallel to the positioning disk 3. The movement trajectory of the positioning groove 31 is symmetrically set. The movement trajectory is set as a symmetrical structure, and the movement trajectories of the guide groove 11 and the positioning groove 31 are the same. This not only allows for self-adjustment of the installation of the gear disk 7, but also self-adjustment of the gear shaft 8, achieving self-adjustment for different workpieces when the gear grinding fixture is clamped.

[0042] Example 5: Figure 10 As shown, based on embodiments two and four, this embodiment further improves the meshing part 43 by setting the upper end of the meshing part 43 as "T". Since the middle part of the positioning groove 31 is set as a protruding arc, when the chuck 4 continues to move outward after passing the middle section, the chuck 4 will move downward. By setting the upper end of the meshing part 43 to protrude to one end, the radial distance of the workpiece can be further adjusted to prevent the workpiece from jumping during processing. In addition, the surface of the meshing part 43 is set as a wavy structure to increase the friction. Because the wavy structure will not jam when the chuck 4 tilts to adjust the workpiece position, the "T" can be applied to the gear disk 7 and the gear shaft 8, achieving self-adjustment for different workpieces when the gear grinding fixture holds the workpiece.

[0043] Example 6: Figure 1-10 As shown, based on Examples 1-5, this embodiment also provides a method for using a gear grinding fixture, including: Rotating the chuck 1 counterclockwise moves the jaw 4 through the guide groove 11 and the positioning groove 31 to the first position 5 far from the center of the chuck 1. When the jaw 4 is pushed to the far end, the gear shaft 8 can be placed easily without much adjustment. Place the gear shaft 8 on the upper surface of the positioning plate 3, and rotate the chuck 1 clockwise. The chuck 1 gradually tilts as it passes through the middle of the positioning groove 31. When the upper surface of the meshing part 43 initially contacts the gear disk 7, and the chuck 1 continues to rotate clockwise, the meshing part 43 pushes the gear disk 7 inward along the movement trajectory of the guide groove 11 and the positioning groove 31. When all the meshing parts 43 are in contact with the gear disk 7 and the contact area is the same, the gear shaft 8 is coaxial with the chuck 1. When the pawl 4 is displaced to the second position 6 at the inner end of the guide groove 11 and the positioning groove 31, the "T"-shaped structure of the meshing part 43 is fully engaged with the gear disk 7, and the assembly is completed. By setting the guide groove 11 and the positioning groove 31, the arc setting of the positioning groove 31 can tilt the pawl 4. When initially contacting the gear disk 7, only one part of the surface will be in contact. The guide groove 11 and the chuck 1 are set on opposite axes, which can push the pawl 4 inward step by step, and push the gear shaft 8 to the coaxial position with the chuck 1. This allows the gear grinding fixture to adjust itself when clamping the gear shaft 8.

[0044] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A gear grinding fixture, characterized in that, include: The chuck is cylindrical, and multiple guide grooves are evenly distributed on the upper surface of the chuck. The number of guide grooves is greater than or equal to three, and the guide grooves are arc-shaped. The guide grooves and the chuck are set on opposite axes. A flange is disposed on the outer ring of the chuck, and the flange is coaxially disposed with the chuck; A positioning plate is disposed on the upper end face of the flange and is fixedly connected to the flange. The number of positioning plates is the same as the number of guide grooves. Positioning grooves are provided at both ends of the positioning plate. The positioning grooves are disposed on the upper end of the guide grooves. One end face of the positioning groove is parallel to the positioning plate. The middle part of the positioning groove is an upwardly protruding arc shape. The chuck jaws are disposed on the upper end of the chuck, and the number of chuck jaws is the same as the number of guide slots. Each chuck jaw includes: A first sliding part is disposed at the lower end of the claw and is disposed in the guide groove. The width of the first sliding part is the same as the width of the guide groove. The second sliding part is located above the first sliding part and is disposed in the positioning groove; A meshing portion, wherein the meshing portion is located at the upper end of the second sliding portion; The positioning disk receives the workpiece, and the chuck rotates. The chuck drives the jaws to move along the movement trajectory of the guide groove and the positioning groove. When the jaws move to the middle of the positioning groove, the meshing part gradually tilts. The upper end of the meshing part initially contacts the workpiece and pushes it outward. When the jaws move to one end, all the meshing parts are fully engaged with the workpiece.

2. The gear grinding fixture according to claim 1, characterized in that, The length of the positioning groove is greater than or equal to the arc of the guide groove.

3. The gear grinding fixture according to claim 1, characterized in that, The movement trajectory of the positioning groove is the same as that of the guide groove. The guide groove is semi-circular in shape, and all corners of the guide groove are rounded.

4. A gear grinding fixture according to claim 3, characterized in that, The lower end of the second sliding part has the same shape as the guide groove.

5. A gear grinding fixture according to claim 1, characterized in that, The flange has multiple threaded holes evenly distributed on its upper end.

6. A gear grinding fixture according to claim 5, characterized in that, The positioning plate is provided with two or more stepped holes, and the positioning plate is fixedly connected to the flange by screws.

7. A gear grinding fixture according to claim 5, characterized in that, The positioning discs are evenly distributed on the upper surface of the flange, and the positioning slots are arranged in pairs.

8. A gear grinding fixture according to claim 7, characterized in that, The second sliding part is disposed between the two positioning grooves.

9. A gear grinding fixture according to claim 1, characterized in that, The two ends of the meshing part are arc-shaped, and the surface of the meshing part is wavy.

10. A method of using a gear grinding fixture, characterized in that, The gear grinding fixture described in any one of claims 1-9 comprises the following steps: Rotate the chuck clockwise to move the jaws through the guide groove and the positioning groove to the first position closest to the center of the chuck; Place the workpiece on the upper surface of the positioning plate, and rotate the chuck counterclockwise. The chuck gradually tilts as it passes through the middle of the positioning groove. The upper end face of the meshing part initially contacts the workpiece. As the chuck continues to rotate counterclockwise, the meshing part pushes the workpiece outward along the movement trajectory of the guide groove and the positioning groove. When all the meshing parts are in contact with the workpiece and the contact area is the same, the workpiece and the chuck are coaxial. When the chuck is displaced to the second position at the outermost end of the guide groove and the positioning groove, the meshing part is fully engaged with the workpiece, and the assembly is completed.

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