Quenching tool for bearing ring

Abstract

The utility model relates to the technical field of quenching tools, in particular to a bearing ring quenching tool. Comprising a square-shaped outer frame, a square-shaped inner frame is vertically installed in the outer frame in a sliding mode, the inner frame is driven by a driving structure to vertically move in a reciprocating mode, a base buckled on the upper portion of the bottom wall of the inner frame is fixedly installed on the bottom wall of the outer frame, a bracket is arranged on the base, and a plurality of downward pressing molds are annularly arrayed on the bracket. The lower pressing die is installed on the bracket in a sliding mode in the radial direction, the opposite face of the lower pressing die is a conical face, and a conical-column-shaped upper pressing die is fixed to the inner frame. Through the design, the use performance of the movable die is optimized, so that the ferrule can be assembled, disassembled and quenched more conveniently and quickly; and meanwhile, the original mode of fixing the size of the movable die by manually fixing the inclined wedge is changed into the mode of fixing the size of the movable die by automatically maintaining pressure through the hydraulic cylinder, manual approaching operation is not needed in the whole quenching process, potential safety hazards in work are greatly eliminated, and the possibility of danger is avoided.

Description

Technical Field

[0001] This utility model relates to the field of quenching tooling technology, and in particular to quenching tooling for bearing rings. Background Technology

[0002] Bearing rings made of carburized steel require heat treatment to improve material properties before grinding. The heat treatment process typically includes carburizing, primary quenching, tempering, secondary quenching, and secondary tempering. While heat treatment increases the strength of carburized steel, it inevitably generates internal stress, requiring tempering to eliminate this stress. Secondary quenching stabilizes the material structure and controls dimensions. In traditional heat treatment processes, without the aid of molds, a large machining allowance was left before heat treatment to ensure the rings' dimensions were not affected by heat treatment deformation. However, this process results in significant energy waste. Because of the large machining allowance and the carburized layer on the surface, this layer is ground away during subsequent machining. The carburized layer improves the wear resistance and fatigue strength of the parts, thus significantly reducing the performance of the bearing rings. To maintain a sufficient depth of carburized layer, process parameters need to be changed to reduce the allowance. However, reducing the allowance often leads to the risk of dimensional deformation during heat treatment, causing parts to be scrapped. To prevent deformation during secondary quenching, the size of the ring is controlled to eliminate the risk of parts being scrapped.

[0003] Therefore, ring molds have emerged in the market for support. Using molds effectively maintains dimensional accuracy, preventing excessive shrinkage and dimensional changes during secondary quenching, which could lead to scrap. Rings come in a variety of sizes, and using fixed molds for each type of ring during quenching would affect production efficiency and manufacturing costs. Some molds become unusable after almost a single use, resulting in significant material waste. Furthermore, the original movable molds required manual fixing. Since the rings reach temperatures as high as 800℃ after heat treatment, manual operation in such high-temperature environments is unsafe and time-consuming. The rings also experience rapid temperature drops after heat treatment due to environmental factors, leading to energy consumption, affecting the quenching effect, and preventing the rings from achieving optimal performance, thus impacting the stability of the company's products.

[0004] Therefore, this utility model provides a bearing ring quenching fixture to improve efficiency and ensure production safety. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art by proposing a bearing ring quenching fixture.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bearing ring quenching fixture includes a U-shaped outer frame, an inner frame of the same shape that is vertically slidably installed inside the outer frame, the inner frame being driven by a drive structure to move vertically back and forth, a base that is fastened to the bottom wall of the outer frame and attached to the bottom wall of the inner frame, a bracket on the base, and a plurality of pressing dies arranged in a ring on the bracket, the pressing dies being radially slidably installed on the bracket, the opposite side of the pressing dies being a conical surface, and a conical upper pressing die fixed on the inner frame.

[0008] Preferably, multiple pressing dies are spliced ​​together to form a ring, and multiple diameter-increasing pads are detachably installed at intervals on the outer wall of each pressing die.

[0009] Preferably, a stud is fixedly installed on the bottom wall of the inner frame at the center of the base, a claw-shaped connecting bracket is inserted into the stud, and nuts are installed on the stud at the upper and lower end faces of the connecting bracket. The claws of the connecting bracket are tightly connected to the upper pressing mold.

[0010] Preferably, a hollow positioning post is embedded at the center of the bracket shaft, and a stud passes through the positioning post.

[0011] Preferably, the bracket has a groove at the bottom axis and the positioning post has a protruding ring at the bottom that matches the groove.

[0012] Preferably, the base includes a mounting platform located above the bottom wall of the inner frame. The mounting platform has a honeycomb structure, and multiple legs are arranged in a circular array at the bottom end of the mounting platform. The multiple legs are symmetrically distributed along the bottom wall of the inner frame, and the bottom ends of the multiple legs are fixed to the bottom wall of the outer frame.

[0013] Preferably, the upper end of the bracket is provided with a groove, and a limiting ring is embedded in the groove.

[0014] Preferably, the inner frame has a guide post on its top wall, and the outer frame has a guide hole on its top wall for the guide post to pass through.

[0015] Preferably, the top wall of the outer frame is provided with multiple lifting rings.

[0016] Preferably, all of the pressing dies are provided with slots at both the upper and lower ends, and all slots in the same plane are embedded with annular elastic elements.

[0017] Compared with the prior art, the present invention provides a bearing ring quenching fixture, which has the following beneficial effects:

[0018] 1. This design optimizes the performance of the movable mold, making it easier and faster to load and unload the rings for quenching. At the same time, the original method of manually fixing the movable mold with wedges is replaced with automatic pressure holding and fixing by hydraulic cylinders. The entire quenching process does not require manual operation, greatly eliminating safety hazards and avoiding the possibility of danger.

[0019] 2. This design uses a hydraulic device to drive and control the inner frame to lift and lower, so as to simultaneously support the lower die. This shortens the operation time, improves the stability of the ring during heat treatment, and avoids excessive temperature loss after heat treatment, which would prevent more effective quenching.

[0020] 3. The use of this design can change the process allowance of the carburized steel ring, avoid heat treatment deformation, effectively retain the carburized layer after quenching, and make the performance of the ring reach the best state. This not only avoids energy waste, but also further improves product quality.

[0021] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0023] Figure 2 This is a front view schematic diagram of the present invention.

[0024] Figure 3 This is a side view of the present invention.

[0025] Figure 4 This is a schematic diagram of the connection structure of the base, bracket, lower pressing mold, and upper pressing mold of this utility model.

[0026] Figure 5 For the present utility model Figure 4 A schematic diagram of the structure after removing a set of pressing dies.

[0027] Figure 6 For the present utility model Figure 4 A cross-sectional schematic diagram.

[0028] Figure 7 This is a schematic diagram of another driving structure for the upper pressure mold of this utility model.

[0029] In the diagram: 1. Outer frame; 2. Inner frame; 3. Hydraulic device; 4. Guide column; 5. Base; 501. Support leg; 502. Mounting platform; 6. Bracket; 7. Lower pressing mold; 8. Slot; 9. Diameter-increasing pad; 10. Upper pressing mold; 11. Stud; 12. Connecting frame; 13. Nut; 14. Lifting ring; 15. Positioning column; 16. Limiting ring. Detailed Implementation

[0030] The following will refer to the appendix in the embodiments of this utility model. Figure 1-7The technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0031] Example 1: To address the problems existing in the prior art, this example provides a bearing ring quenching fixture, including a U-shaped outer frame 1, within which a U-shaped inner frame 2 is vertically slidably mounted. Both the outer frame and the inner frame 2 are formed by splicing channel steel. The inner frame 2 is driven by a drive structure to move vertically back and forth; in this solution, the drive device is a hydraulic device 3. A base 5 is fixedly mounted on the bottom wall of the outer frame 1, fastened to the top of the bottom wall of the inner frame 2. A bracket 6 is provided on the base 5, and multiple pressing molds 7 are arranged in a circular array on the bracket 6. The pressing molds 7 are radially slidably mounted on the bracket 6, and the bracket 6 and the multiple pressing molds 7 together form a movable mold. The opposite side of the pressing mold 7 is a conical surface, and a conical upper pressing mold 10 is fixed on the inner frame 2.

[0032] All the pressing dies 7 have slots 8 on their outer edges at both ends, and all slots 8 in the same plane are fitted with annular elastic elements. The elastic elements are selected from high-temperature resistant springs (not shown in the attached drawings).

[0033] When in use, first fix the entire tooling on the quenching tank lifting platform; the hydraulic cylinder of the hydraulic device 3 is fixed on the upper top wall of the outer frame 1, and the piston part of the hydraulic device 3 passes through the upper top wall of the outer frame 1 and is fastened to the upper top wall of the inner frame 2 by bolts.

[0034] Under the action of the hydraulic device 3, the inner frame 2 moves automatically up and down with the hydraulic cylinder piston, thereby driving the upper pressure mold sleeve to move up and down. The upper pressure mold 10 descends, and the conical surface of the upper pressure mold 10 abuts against the inner conical surface of the lower pressure mold 7, thereby separating from the axis of the back support 6 of the lower pressure mold 7. The upper pressure mold 10 rises and separates from the lower pressure mold 7, and the lower pressure mold 7 is pulled back to its original position under the action of the spring; thus, the outer diameter of the movable mold can be freely changed.

[0035] After the upper pressure die sleeve rises, the outer diameter of the movable die returns to the set minimum size. At this point, the heat-treated ring can be placed on the outer ring of the movable die, that is, the ring is placed on the outer wall of all the lower pressure dies 7. Then, the hydraulic device 3 drives the upper pressure die sleeve to move downward, so that the lower pressure die 7 is opened to achieve the inner diameter of the ring that was initially adjusted, and pressure holding treatment is performed. After the movable die is opened, the lifting platform descends and takes the movable die part (mainly the outer ring) into the quenching oil, so that the ring can complete the secondary quenching. After quenching, the lifting platform raises the entire fixture and places it above the oil tank. Then, the hydraulic device 3 lifts the inner frame 2, which drives the upper pressure die sleeve to rise, and the outer diameter of the movable die becomes smaller. At this time, the ring is removed.

[0036] According to the above technical solution, the hydraulic device 3 drives the upper pressing mold 10 to be fixed in the required position. At the same time, the pressure holding capacity of the hydraulic cylinder is used to lock the upper pressing mold sleeve, resisting the shrinkage stress generated by the shrinkage of the ring during quenching, preventing the ring from deforming, thereby completing the secondary quenching of the carburized steel ring, without causing changes in the ring size.

[0037] In this embodiment, the outer frame 1 is composed of channel steel of different sizes made of Q355B material. The upper part is fixed by welding, making the whole more robust. The top supports the cylinder of the hydraulic device 3, and the bottom is connected by threaded connectors. When changing different movable molds, the bottom connection is loosened and the bottom structure is pulled out of the oil tank lifting platform for replacement. This facilitates maintenance and is convenient for movable molds of different sizes, greatly improving the application scenarios and scope of automated movable molds. After replacement, it is moved to the platform position for fixation. At the same time, when automated mold quenching is not required, loosening the bottom structure also makes it easy to remove the automated bearing ring quenching fixture, so that the quenching pool can be used in multiple ways.

[0038] In this embodiment, the inner frame 2 is composed of channel steel of different sizes made of Q355B material. The upper part adopts a welded structure, and the top is connected to the piston flange of the hydraulic device 3. The bottom is connected by threads. When using the automated movable mold, the bottom support is fixed with threaded fasteners, and the upper pressure mold sleeve of the movable mold is connected and fixed to the bottom plate of the inner frame 2 through the threaded rod and the connecting bracket 12. The inner frame 2 drives the upper pressure mold sleeve to move up and down.

[0039] In this embodiment, the bracket 6 has a ring array of T-shaped slots corresponding one-to-one with the pressing molds 7, and the T-shaped slots are arranged radially along the bracket 6. The bracket 6 has a through hole running vertically through its axis. The trapezoidal slot faces the axis of the bracket 6 from the inner wall of the through hole, and each pressing mold 7 has a T-shaped block at its bottom. The T-shaped block is embedded in the T-shaped slot to achieve radial sliding installation of the pressing mold 7 on the bracket 6. Preferably, a high-temperature resistant spring can also be provided in the trapezoidal slot to abut against the T-shaped block to achieve the resetting of the pressing mold 7.

[0040] In a further embodiment of this solution, multiple pressing dies 7 are assembled into a ring, and multiple diameter-enlarging blocks 9 are detachably installed at intervals on the outer wall of each pressing die 7. The diameter-enlarging blocks 9 are fastened to the side wall of the pressing die 7 with screws. The diameter-enlarging blocks 9 are used to adjust the outer diameter of the movable die composed of multiple pressing dies 7, thereby increasing the usable space of the pressing die 7 and reducing the waste of the pressing die 7. At the same time, the diameter-enlarging blocks 9 on the outer wall of each pressing die 7 can minimize the contact area with the inner wall of the ring while ensuring stable pressing, so that the inner diameter of the ring can have more contact area with the quenching oil, thereby improving the quenching effect.

[0041] In a further embodiment of this solution, a stud 11 is fixedly installed on the bottom wall of the inner frame 2 at the axial position of the base 5. A claw-shaped connecting bracket 12 is inserted into the stud 11. Nuts 13 are installed on the stud 11 at both the upper and lower end faces of the connecting bracket 12. The claws of the connecting bracket 12 are fastened to the upper pressing mold 10 by screws. This achieves the connection between the upper pressing mold 10 and the bottom wall of the inner frame 2.

[0042] In a further embodiment of this solution, a hollow positioning post 15 is embedded at the axis of the bracket 6, and a stud 11 passes through the positioning post 15. The positioning post 15 is used for positioning during the assembly of the movable mold. The upper pressure mold 10 also has a channel for the positioning post 15 to pass through, avoiding displacement interference.

[0043] In a further embodiment of this solution, a groove is provided at the bottom axis of the bracket 6, and a protruding ring adapted to the groove is provided at the bottom of the positioning post 15. The mounting connection between the positioning post 15 and the bracket 6 is completed, with the protruding ring embedded in the groove, the positioning post 15 penetrating the bracket 6, and the bracket 6 placed on the mounting platform 502. The positioning post 15 is then fastened under heavy load, thus completing the positioning and installation of the positioning post 15. The plug-in method also makes disassembly and assembly more convenient.

[0044] In a further embodiment of this solution, the base 5 includes a mounting platform 502 located above the bottom wall of the inner frame 2. Both the mounting platform 502 and the non-assembly parts (parts not connected to the lower mold 7) of the bracket 6 have a honeycomb structure. Multiple legs 501 are arranged in a circular array at the bottom end of the mounting platform 502, symmetrically distributed along the bottom wall of the inner frame 2, and their bottom ends are fixed to the bottom wall of the outer frame 1. The mounting platform 502 is erected using the multiple legs 501, thus achieving the fastening of the base 5 to the bottom wall of the inner frame 2 and providing space for the inner frame 2 to rise and fall. The base 5 serves as the support for the movable mold and is fixed as a whole to the bottom wall of the outer frame 1. The mounting platform 502 in the base 5 has a honeycomb structure and a hollow design, minimizing the obstruction area while ensuring strength. This provides a connection channel between the upper mold sleeve and the inner frame 2, and also ensures that the quenching oil can quickly contact the ring to be quenched.

[0045] In a further embodiment of this solution, the upper end of the bracket 6 is provided with a recessed groove, and a limiting ring 16 is embedded in the recessed groove. The limiting ring 16 is sleeved on the positioning post 15. The limiting ring 16 blocks and positions the final descending position of the upper pressing mold 10, preventing the upper pressing mold 10 from hitting the edges of the bracket 6 and causing damage.

[0046] In a further embodiment of this solution, a guide post 4 is provided on the top wall of the inner frame 2, and a guide hole is provided on the top wall of the outer frame 1 for the guide post 4 to pass through. The cooperation between the guide post 4 and the guide hole guides and limits the vertical movement of the inner frame 2, preventing excessive deviation of the inner frame 2 during movement and improving the stability of the vertical movement of the inner frame 2.

[0047] In a further embodiment of this solution, multiple lifting rings 14 are provided on the top wall of the outer frame 1 to assist in the lifting and transfer of tooling.

[0048] In Example 2, in Example 1, the base 5 is fastened to the bottom wall of the inner frame 2. When the movable mold is disassembled, it needs to be raised. Therefore, in this example, the vertical dimension of the inner frame 2 is reduced, as shown in the attached figure. Figure 7 As shown, the bottom wall of the inner frame 2 is located above the lower pressing mold 7, and the lower pressing mold 7 is fastened to the bottom wall of the inner frame 2 by screws. In this way, the hydraulic device 3 is connected to the inner frame 2, which makes driving more convenient and eliminates the need to control the height of the support legs 501 of the base 5 to leave vertical movement space for the upper pressing mold 10; when the movable mold is removed, the inner frame 2 drives the upper pressing mold 10 to rise, so as not to interfere with the transfer of the movable mold.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bearing ring quenching fixture, characterized in that, The outer frame (1) is shaped like a square, and an inner frame (2) is vertically slidably installed inside the outer frame (1). The inner frame (2) is driven by a drive structure and can move vertically back and forth. A base (5) is fixedly installed on the bottom wall of the outer frame (1) and fastened to the bottom wall of the inner frame (2). A bracket (6) is provided on the base (5). Multiple pressing molds (7) are arranged in a ring on the bracket (6). The pressing molds (7) are slidably installed on the bracket (6) in the radial direction. The opposite side of the pressing molds (7) is a conical surface. A conical upper pressing mold (10) is fixed on the inner frame (2).

2. The bearing ring quenching fixture according to claim 1, characterized in that, Multiple pressing dies (7) are spliced ​​together to form a ring, and multiple diameter-increasing pads (9) are detachably installed on the outer wall of each pressing die (7).

3. The bearing ring quenching fixture according to claim 1, characterized in that, A stud (11) is fixedly installed on the bottom wall of the inner frame (2) at the axial position of the base (5). A claw-shaped connecting frame (12) is inserted into the stud (11). Nuts (13) are installed on the stud (11) at the upper and lower ends of the connecting frame (12). The claws of the connecting frame (12) are tightly connected to the upper pressing mold (10).

4. The bearing ring quenching fixture according to claim 3, characterized in that, A hollow positioning post (15) is embedded at the center of the bracket (6), and a stud (11) passes through the positioning post (15).

5. The bearing ring quenching fixture according to claim 4, characterized in that, The bracket (6) has a groove at the bottom axis, and the positioning post (15) has a convex ring at the bottom that matches the groove.

6. The bearing ring quenching fixture according to claim 1, characterized in that, The base (5) includes a mounting platform (502) located above the bottom wall of the inner frame (2). The mounting platform (502) has a honeycomb structure. Multiple legs (501) are arranged in a ring at the bottom of the mounting platform (502). The multiple legs (501) are symmetrically distributed along the bottom wall of the inner frame (2). The bottom ends of the multiple legs (501) are all fixed to the bottom wall of the outer frame (1).

7. The bearing ring quenching fixture according to claim 1, characterized in that, The bracket (6) has a groove at the upper end of its shaft, and a limiting ring (16) is embedded in the groove.

8. The bearing ring quenching fixture according to claim 1, characterized in that, The inner frame (2) has a guide post (4) on its top wall, and the outer frame (1) has a guide hole for the guide post (4) to pass through on its top wall.

9. The bearing ring quenching fixture according to claim 1, characterized in that, Multiple lifting rings (14) are provided on the top wall of the outer frame (1).

10. The bearing ring quenching fixture according to claim 1, characterized in that, All of the pressing molds (7) are provided with slots (8) at both the upper and lower ends, and all slots (8) in the same plane are embedded with annular elastic elements.

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