A scalable ring quenching correction device

Abstract

The application belongs to the technical field of gear ring machining, and discloses a scalable gear ring quenching correction device, which comprises a base, a telescopic rod, a correction claw and a supporting pressing plate. The scalable telescopic rod structure replaces the traditional fixed-size correction mandrel, can adapt to the correction requirements of gear rings of different diameters, reduces the tooling investment cost during the production of gear rings of different specifications, can make small adjustments to the uncertainty deformation of the same type of gear ring after carburizing, significantly improves the correction accuracy, reduces the problems of gear grinding black skin and scrapping caused by deformation out of tolerance, adopts a separate correction claw structure uniformly distributed in a circle, compared with the traditional complete cylindrical mandrel, the contact area during correction is smaller, the separate structure is beneficial to the flow of quenching oil, can improve the cooling effect inside the gear ring, improves the quenching metallographic structure of the gear ring, and further improves the mechanical properties of the gear ring.

Description

Technical Field

[0001] This application belongs to the field of gear ring processing technology, and in particular relates to a retractable gear ring quenching and correction device. Background Technology

[0002] Gear rings, as core components of gearboxes, are widely used. To ensure that gear rings possess comprehensive performance indicators such as high strength, high wear resistance, high fatigue strength, and high impact toughness, they undergo carburizing and quenching heat treatment after gear hobbing. However, due to the thin walls and large diameter of gear rings, the yield strength of steel decreases from approximately 300 MPa to around 20 MPa during the prolonged carburizing process at 930℃ and holding at 820℃. Their thin-walled structure makes them prone to deformation, resulting in excessive ellipticity and taper, leading to defects such as black scale during subsequent gear grinding. This results in a high scrap rate and significantly impacts production costs and schedules.

[0003] Currently, quenching and straightening fixtures are commonly used to control dimensional deformation during carburizing and quenching. These fixtures typically consist of a straightening mandrel, a support plate, and a lifting plate. The outer surface of the straightening mandrel is cylindrical. To ensure coaxiality at all points on the cylindrical surface, the mandrel is usually machined to a fixed size. The straightening method relies on the mandrel, with a diameter similar to that of the gear ring, to straighten the roundness of the gear ring's inner diameter during cooling. The gear ring and the fixture are connected by the support plate, and the lifting plate is used for lifting and moving the fixture. Existing fixtures have two drawbacks: first, the inner diameter of the gear ring undergoes uncertain deformation after carburizing (typically fluctuating within a range of one-thousandth), making it impossible to make minute adjustments for these changes, resulting in low straightening accuracy; second, the fixed size of the straightening mandrel leads to high fixture costs when manufacturing single-type or multi-specification gear rings. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, this application provides a telescopic gear ring quenching and correction device, including a base, a telescopic rod with adjustable radial dimensions, a correction claw, and support plates. Multiple mounting surfaces are evenly distributed on the outer circumference of the base, and multiple measurement reference surfaces corresponding to and coaxial with the mounting surfaces are evenly distributed on the inner circumference of the base. Mounting screw holes are provided on the mounting surfaces. The telescopic rod is a bolt with a nut at one end, and the bolt end of the telescopic rod is threaded into the mounting screw hole. The correction claw is located at the nut end of the telescopic rod, and a groove is provided on the outer surface of the correction claw. The nut end of the telescopic rod is installed in the groove of the correction claw. An inner nut and an outer nut are threaded onto the telescopic rod, with the inner nut located at the end closer to the mounting surface and the outer nut located at the end farther from the mounting surface. Multiple sets of support plates are evenly distributed and fixed to the upper surface of the base along the circumferential direction.

[0005] Preferably, the measurement reference surface and the mounting surface are in the same position and have the same number.

[0006] Preferably, eight sets of calibration claws are evenly distributed on the measuring reference surface and the mounting surface, and each mounting surface is equipped with a calibration claw via the telescopic rod, forming a structure of eight calibration claws evenly distributed and separated from each other along the circumference of the base. The eight calibration claws are coaxial through the mounting surface and the measuring reference surface, and the outer surfaces of all eight calibration claws are located on the same diameter arc surface.

[0007] Preferably, each mounting surface has two vertically arranged mounting screw holes, each mounting screw hole is internally threaded with a telescopic rod, and the nut ends of the upper and lower telescopic rods are both connected to the same correction claw.

[0008] Preferably, the end face of the nut of the telescopic rod and the outer surface of the correction claw are the same arc surface.

[0009] Preferably, the correction claw is a long strip structure with a width not less than twice the tooth pitch of the tooth ring.

[0010] Preferably, the upper surface of the base is provided with a plurality of lifting holes, which are offset from the supporting pressure plate.

[0011] Preferably, a guide block is fixedly connected to the lower end of the correction claw, and the outer side of the guide block is set as an inclined surface.

[0012] Preferably, the base is coaxially arranged in the inner circle of the gear ring, the support plate abuts against the upper surface of the gear ring, and the plurality of correction claws abut against the inner end face of the gear ring.

[0013] Preferably, a material tray is provided below the gear ring, and a pad is fixed between the material tray and the gear ring.

[0014] The retractable gear ring quenching and straightening device of this application has the following advantages and positive effects: (1) The telescopic rod structure replaces the traditional fixed-size correction mandrel, which can adapt to the correction requirements of gear rings with different diameters, reducing the tooling investment cost when producing gear rings of multiple specifications. Furthermore, by adopting a structure with multiple separate correction claws evenly distributed around the circumference, it can also make local fine adjustments to address the uncertain deformation of the same gear ring after carburizing, significantly improving the correction accuracy and reducing problems such as black skin on the ground teeth and scrap caused by excessive deformation.

[0015] (2) The circumferentially distributed split correction claw structure is adopted. Compared with the traditional complete cylindrical mandrel, the contact area during correction is smaller, the correction pressure per unit area of ​​the contact part is increased, the correction effect of the gear ring is improved, and the correction accuracy is improved. Moreover, the split structure is conducive to the flow of quenching oil, which can improve the cooling effect inside the gear ring, improve the quenching metallographic structure of the gear ring, and further improve the mechanical properties of the gear ring.

[0016] (2) The overall structure of the device is reasonably designed. The one-time machining of the mounting surface and the measuring reference surface ensures coaxiality. The setting of the guide block facilitates the assembly of the device and the gear ring. The whole device is easy to operate and can effectively improve the production efficiency and product quality of the gear ring and reduce production costs. 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 only for further understanding of the embodiments of this application and constitute a part of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a top view of the retractable gear ring quenching and correction device of this application; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the gear ring quenching and correction device of this application and the gear ring in a mating state; Figure 4 yes Figure 3 The cross-sectional view at BB.

[0018] Explanation of reference numerals in the attached figures: 1-Base, 2-Mounting screw hole, 3-Telescopic rod, 4-Correction claw, 5-Guide block, 6-Lifting hole, 7-Supporting pressure plate, 8-Inner nut, 9-Outer nut, 10-Mounting surface, 11-Measuring reference surface, 12-Gear ring, 13-Padded block, 14-Material tray. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] like Figures 1 to 4 As shown, the telescopic gear ring quenching correction device of this embodiment includes a base 1, a telescopic rod 3 with adjustable radial dimensions, a correction claw 4 for correcting the roundness of the gear ring 12, and a support pressure plate 7 for supporting and positioning. Multiple mounting surfaces 10 are evenly distributed on the outer circumference of the base 1, and multiple measuring reference surfaces 11 corresponding to the mounting surfaces 10 are evenly distributed on the inner circumference of the base 1. Mounting screw holes 2 are opened on the mounting surfaces 10. The telescopic rod 3 is a bolt with a nut at one end. The bolt end of the telescopic rod 3 is threaded into the mounting screw hole 2. The correction claw 4 is set at the nut end of the telescopic rod 3. A groove is opened on the outer side of the correction claw 4. The nut end of the telescopic rod 3 is installed in the groove of the correction claw 4. Preferably, the nut end face of the telescopic rod 3 and the outer side face of the correction claw 4 are the same arc surface. An inner nut 8 and an outer nut 9 are threadedly connected to the telescopic rod 3. The inner nut 8 is located at the end close to the mounting surface 10, and the outer nut 9 is located at the end away from the mounting surface 10.

[0021] When adjusting the radial dimension of the telescopic rod 3 to accommodate gear rings of different diameters, both the inner nut 8 and the outer nut 9 are rotated to the middle position of the telescopic rod 3. By rotating the bolt part of the telescopic rod 3, the telescopic rod 3 is moved radially. The distance between the measuring reference surface 11 of the base 1 and the outer side of the correction claw 4 is measured with a vernier caliper until the radius of the base 1 and the sum of the distance between the measuring reference surface 11 and the outer side of the correction claw 4 match the inner diameter of the gear ring to be corrected. Thus, the position of the telescopic rod 3 is adjusted into place. Then, the inner nut 8 is tightened towards the mounting surface 10 of the base 1, so that the inner nut 8 is tightly against the mounting surface 10 of the base 1. Subsequently, the outer nut 9 is tightened towards the correction claw 4, so that the outer nut 9 is tightly against the inner side of the correction claw 4, thus adjusting the position of the correction claw 4 into place. Therefore, the arc surfaces of the outer sides of the multiple correction claws 4 are matched with the inner circle of the gear ring to be corrected. Through the coordinated action of the extension rod 3 and the thread limit of the mounting screw hole 2, the limit between the inner nut 8 and the mounting surface 10, and the limit between the outer nut 9 and the correction claws 4, the correction claws 4 are completely fixed, ensuring that they will not loosen or shift during the correction process of the gear ring 12 quenching and cooling, thereby ensuring the stability and accuracy of the correction effect.

[0022] Multiple sets of support plates 7 are evenly distributed and fixed on the upper surface of the base 1 along the circumference of the base 1. The base 1 is coaxially set in the inner circle of the gear ring 12. The support plates 7 abut against the upper surface of the gear ring 12. Multiple correction claws 4 abut against the inner end face of the gear ring 12, that is, the outer arc surface of the correction claw 4 contacts the tooth tip surface of the gear ring 12. A material tray 14 is provided below the gear ring 12. A pad 13 is fixed between the material tray 14 and the gear ring 12. The pad 13 can support the gear ring 12 and keep the gear ring 12 in a stable position during the quenching and cooling process.

[0023] The measuring reference surface 11 corresponds to the mounting surface 10 in position and has the same number. Preferably, both the mounting surface 10 and the measuring reference surface 11 are machined in one operation by a machine tool to ensure the coaxiality of the mounting surface 10 and the measuring reference surface 11.

[0024] In this embodiment, eight sets of calibration claws are evenly distributed on the measuring reference surface 11 and the mounting surface 10. Each mounting surface 10 is equipped with a calibration claw 4 via a telescopic rod 3, thereby forming a structure of eight calibration claws that are evenly distributed and separated from each other along the circumference of the base 1. The eight calibration claws are coaxial through the coaxial mounting surface 10 and the measuring reference surface 11. The outer surfaces of all calibration claws 4 are located on the same diameter arc surface, ensuring that the calibration force applied to the inner diameter of the gear ring is more balanced, improving the roundness calibration effect, realizing high-precision calibration and local fine adjustment of the gear ring, and at the same time improving the quenching and cooling effect of the teeth.

[0025] Preferably, the correction claw 4 is a long strip structure, and its width is set to be no less than twice the tooth pitch of the tooth ring, so as to ensure that each correction claw 4 can make contact with the tooth tip surface of the tooth ring 12, thereby enabling effective correction work.

[0026] Preferably, each mounting surface 10 has two vertically arranged mounting screw holes 2, and each mounting screw hole 2 is internally threaded with a telescopic rod 3. The nut ends of the upper and lower telescopic rods 3 are both connected to the same correction claw 4, thereby enabling the gear ring 12 to be corrected simultaneously from the upper and lower positions of the inner circle of the gear ring 12, further enhancing the stability and reliability of the correction.

[0027] Optionally, the upper surface of the base 1 is provided with multiple lifting holes 6, which are staggered with the support plate 7. This does not affect the supporting function of the support plate 7, but also allows the crane to easily lift and move the device through the lifting holes 6, meeting the needs of transferring the device between different processes.

[0028] Preferably, a guide block 5 is fixedly connected to the lower end of the correction claw 4, and the outer side of the guide block 5 is set as an inclined surface. This inclined structure can guide the device when it is placed inside the gear ring 12, so that the device can quickly and accurately enter the designated position and avoid the correction process being affected by positioning deviation.

[0029] The specific usage method and operation process of the retractable gear ring quenching and straightening device in this embodiment are as follows: Based on the inner diameter of the gear ring 12 to be corrected after carburizing and the radius A0 of the base 1, calculate the distance B0 between the outer side of the correction claw 4 and the measuring reference surface 11, where B0 is equal to the difference between the inner diameter of the gear ring 12 and the radius A0 of the base 1. Then, rotate the inner nut 8 and the outer nut 9 to the middle of the telescopic rod 3, and adjust the bolt parts of the multiple circumferentially distributed telescopic rods 3 so that the distance between the outer side of all correction claws 4 and the measuring reference surface 11 reaches B0. Then, tighten the inner nut 8 and the outer nut 9 to both sides respectively. Tighten the inner nut 8 to the mounting surface 10 of the base 1 and tighten the outer nut 9 to the inner side of the correction claw 4.

[0030] The gear ring 12 is heated and held in a furnace at a temperature of 800-850℃, the specific temperature depending on the material composition of the gear ring 12. Simultaneously, the calibration device is heated and held in another furnace at a temperature of 200-300℃, the specific temperature depending on the cooling rate of the gear ring 12 in the quenching oil.

[0031] After the heat preservation of the gear ring 12 is completed, the crane lifts the calibration device through the lifting hole 6 and inserts it into the gear ring 12. Since the temperature of the gear ring 12 is higher than that of the calibration device, there is a large gap between them. The device is guided in by the guide block 5 and supported by the support plate 7 on the end face of the gear ring 12. The lower end of the calibration device is suspended relative to the gear ring 12.

[0032] The crane lifts the material tray 14 boom, and puts the gear ring 12 and the correction device into the quenching oil for cooling. As the two cool and shrink and the microstructure of the gear ring 12 changes, the evenly distributed correction claws 4 with good coaxiality correct the roundness of the inner diameter of the gear ring 12.

[0033] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, 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. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0034] 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A retractable gear ring quenching and straightening device, characterized in that, The system includes a base (1), an adjustable telescopic rod (3), a correction claw (4), and a support plate (7). Multiple mounting surfaces (10) are evenly distributed on the outer circumference of the base (1), and multiple measurement reference surfaces (11) corresponding to and coaxial with the mounting surfaces (10) are evenly distributed on the inner circumference of the base (1). Mounting screw holes (2) are provided on the mounting surfaces (10). The telescopic rod (3) is a bolt with a nut at one end, and the bolt end of the telescopic rod (3) is threadedly connected to the support plate (7). Inside the mounting screw hole (2), the correction claw (4) is set at the nut end of the telescopic rod (3). The outer side of the correction claw (4) is provided with a groove. The nut end of the telescopic rod (3) is installed in the groove of the correction claw (4). The telescopic rod (3) is threaded with an inner nut (8) and an outer nut (9). The inner nut (8) is located at one end close to the mounting surface (10), and the outer nut (9) is located at one end away from the mounting surface (10). Multiple sets of support plates (7) are evenly distributed and fixed on the upper surface of the base (1) along the circumferential direction of the base (1).

2. The retractable gear ring quenching and straightening device according to claim 1, characterized in that, The measurement reference surface (11) corresponds to the mounting surface (10) in position and the number of the two surfaces is the same.

3. The retractable gear ring quenching and straightening device according to claim 2, characterized in that, The measuring reference surface (11) and the mounting surface (10) are each provided with eight sets of calibration claws. Each mounting surface (10) is equipped with a calibration claw (4) through the telescopic rod (3), forming a structure of eight calibration claws that are evenly distributed and separated from each other along the circumference of the base (1). The eight calibration claws are coaxial through the mounting surface (10) and the measuring reference surface (11), and the outer surfaces of all eight calibration claws are located on the same diameter arc surface.

4. The retractable gear ring quenching and straightening device according to claim 3, characterized in that, Two mounting screw holes (2) are arranged vertically on each mounting surface (10). Each mounting screw hole (2) is internally threaded with a telescopic rod (3). The nut ends of the upper and lower telescopic rods (3) are connected to the same correction claw (4).

5. The retractable gear ring quenching and straightening device according to claim 4, characterized in that, The end face of the nut of the telescopic rod (3) and the outer surface of the correction claw (4) are the same arc surface.

6. The retractable gear ring quenching and straightening device according to claim 1, characterized in that, The correction claw (4) is a long strip structure with a width set to be no less than twice the tooth pitch of the tooth ring.

7. The retractable gear ring quenching and straightening device according to claim 1, characterized in that, The upper surface of the base (1) is provided with a plurality of lifting holes (6), which are offset from the support plate (7).

8. The retractable gear ring quenching and straightening device according to claim 1, characterized in that, The lower end of the correction claw (4) is fixedly connected to a guide block (5), and the outer side of the guide block (5) is set as an inclined surface.

9. The retractable gear ring quenching and straightening device according to claim 1, characterized in that, The base (1) is coaxially arranged in the inner circle of the gear ring (12), the support plate (7) abuts against the upper surface of the gear ring (12), and the plurality of correction claws (4) abut against the inner circle end face of the gear ring (12).

10. The retractable gear ring quenching and straightening device according to claim 9, characterized in that, A material tray (14) is provided below the toothed ring (12), and a pad (13) is fixed between the material tray (14) and the toothed ring (12).

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