Split bearing machining fixture

Abstract

The utility model relates to bearing processing technical field, concretely is a kind of split bearing processing fixture, including base, the top surface center of base is fixed with inner support positioning mandrel, the top surface of base is located and is equipped with a plurality of dog on the outside circumferential sliding of inner support positioning mandrel, the top surface of base is equipped with gland above, it is connected between the gland and base by a plurality of fastening bolt, the top surface of base is located and is equipped with wedge-shaped centring assembly symmetrically in the split seam both sides of split bearing, the bottom surface of gland is embedded with floating block by mounting groove, the floating block is connected with the mounting groove bottom surface of the gland by elastic element. This split bearing processing fixture can accurately position and firmly clamp two half bearing parts, ensure the centring and the degree of fit when secondary finishing, effectively improve the size and form tolerance qualified rate of bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing processing technology, specifically a split bearing processing fixture. Background Technology

[0002] Split bearings are a type of bearing that is radially split into two halves. They are widely used in heavy machinery and large transmission equipment because they are easy to install and maintain without shutting down the machine. In their manufacturing process, the whole blank is usually rough-machined first, then split into two halves, and then the two halves are reassembled and clamped to complete the secondary finishing of key parts such as the inner hole and end face.

[0003] In the existing secondary finishing process of split bearings, the two halves of the bearing are usually directly joined together and clamped by an external chuck or pressure plate. However, after the bearing is split, the cross-section is often rough and uneven. In fact, some material may be removed or slight deformation may occur during the splitting process. As a result, the two halves cannot be accurately fitted together when they are directly joined. Under the action of clamping force, radial or axial relative misalignment is very likely to occur. This clamping misalignment will cause the positioning reference to shift during finishing, resulting in the dimensions and form and position tolerances of the finished bearing exceeding the tolerance, making it difficult to meet the quality requirements of the actual product. Utility Model Content

[0004] The purpose of this utility model is to provide a machining fixture for split bearings, so as to solve the problem mentioned in the background art that the unevenness of the split surface during the secondary precision machining and clamping of split bearings leads to misalignment of the two halves of the parts, resulting in excessive machining dimensions and geometric tolerances.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a split bearing processing fixture, comprising a base, an inner support positioning mandrel fixed at the center of the top surface of the base, multiple pawls slidably arranged circumferentially on the top surface of the base outside the inner support positioning mandrel, a pressure cap provided above the base, the pressure cap being connected to the base by multiple fastening bolts, wedge-shaped centering components symmetrically arranged on both sides of the split joint of the split bearing on the top surface of the base, and a floating pressure block embedded in the bottom surface of the pressure cap through a mounting groove, the floating pressure block being connected to the bottom surface of the mounting groove of the pressure cap through an elastic element.

[0006] Preferably, the wedge-shaped centering assembly includes a guide wedge block slidably disposed within the base, the tail of the guide wedge block having a driving inclined surface, and the bottom surface of the bolt head of the fastening bolt abutting against the driving inclined surface of the guide wedge block.

[0007] Preferably, the guide wedge has a V-shaped guide edge at one end near the split joint, and the base has a guide countersunk hole for the guide wedge to slide in, and a return spring is provided in the guide countersunk hole to abut against the tail of the guide wedge.

[0008] Preferably, an annular compensation gap is left between the top edge of the floating pressure block and the side wall of the mounting groove of the pressure cover, and the elastic element is a plurality of disc springs evenly distributed in the circumferential direction between the top surface of the floating pressure block and the bottom surface of the mounting groove.

[0009] Preferably, the top surface of the base is provided with a T-shaped groove that matches the number of claws, the bottom of the claws is provided with a T-shaped slider that matches the T-shaped groove, and the outer side of the base is threaded with an adjusting screw that abuts against the side of the T-shaped slider.

[0010] Preferably, the top of the inner support positioning mandrel is provided with a conical pressure cap and a floating centering rod. The conical pressure cap is threaded to the top of the inner support positioning mandrel, and the floating centering rod is slidably inserted into the central hole of the inner support positioning mandrel. The top of the floating centering rod is provided with a ball head that fits against the conical surface of the inner wall of the conical pressure cap.

[0011] Compared with existing technologies, the advantages of this utility model are: the split bearing machining fixture can accurately position and firmly clamp two halves of the bearing parts, ensuring alignment and fit during secondary finishing, and effectively improving the dimensional and geometric tolerance pass rate of the bearing. Through the linkage design of the wedge-shaped alignment component and the fastening bolts, the split bearing machining fixture automatically and forcibly corrects the radial misalignment at the split joint during the locking process. Combined with the adaptive compensation structure of the floating pressure block and elastic element, it effectively absorbs the height difference of the end face and applies uniform axial pressure. Furthermore, the internal and external coordinated clamping of the inner support positioning mandrel and the jaws achieves stable clamping under multi-degree-of-freedom constraints, fundamentally avoiding the datum offset problem caused by uneven split surfaces. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a split bearing machining fixture according to the present invention; Figure 2 This is a top view of the base structure of a split bearing processing fixture according to the present invention; Figure 3 This is a schematic diagram of the bottom structure of the cover of a split bearing processing fixture according to the present invention.

[0013] In the diagram: 1. Base; 11. T-shaped slide; 12. Adjusting screw; 13. Guide countersunk hole; 14. Return spring; 2. Inner support positioning mandrel; 21. Conical pressure cap; 22. Floating centering rod; 3. Claw; 31. T-shaped slider; 4. Pressure cap; 5. Fastening bolt; 6. Wedge-shaped centering assembly; 61. Guide wedge block; 62. V-shaped guide edge; 7. Floating pressure block; 71. Disc spring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-3 This utility model provides a technical solution: a split bearing processing fixture, including a base 1, an inner support positioning mandrel 2 fixed at the center of the top surface of the base 1, multiple claws 3 slidably arranged circumferentially on the top surface of the base 1 outside the inner support positioning mandrel 2, a pressure cover 4 above the base 1, the pressure cover 4 and the base 1 connected by multiple fastening bolts 5, wedge-shaped centering components 6 symmetrically arranged on both sides of the split joint of the split bearing on the top surface of the base 1, the driving end of the wedge-shaped centering components 6 engaging with the rod of the fastening bolts 5, a floating pressure block 7 embedded in the bottom surface of the pressure cover 4 through an installation groove, the floating pressure block 7 being connected to the bottom surface of the installation groove of the pressure cover 4 through an elastic element, and tightening the fastening bolts 5 to press the pressure cover 4 downwards to tighten the bearing at the same time. The bolt 5 synchronously drives the two wedge-shaped centering components 6 to move horizontally towards the split joint. The forced guiding effect of the wedge-shaped surface is used to radially correct and align the split sections of the two bearing halves. At the same time, the floating pressure block 7 adaptively compensates for the height difference between the end faces of the two bearing halves under the support of the elastic element and applies uniform axial pressure. In conjunction with multiple claws 3, the outer circle of the bearing is circumferentially clamped and positioned from the outside. This realizes the linkage execution of clamping, centering and floating compensation, which effectively solves the problem of radial or axial misalignment and offset of the precision machining positioning datum when the two halves of the parts are joined due to the rough and uneven split section in the existing technology. It ensures the centering and end face fit during secondary precision machining and significantly improves the pass rate of bearing dimensions and geometric tolerances.

[0016] Specifically, the wedge-shaped centering assembly 6 includes a guide wedge 61 slidably disposed within the base 1. The tail of the guide wedge 61 has a driving inclined surface. The bottom surface of the bolt head of the fastening bolt 5 abuts against the driving inclined surface of the guide wedge 61. A V-shaped guide edge 62 is provided at one end of the guide wedge 61 near the split joint. A guide countersunk hole 13 is provided within the base 1 for the guide wedge 61 to slide. A return spring 14 abuts against the tail of the guide wedge 61 within the guide countersunk hole 13. Through the abutting engagement between the bottom surface of the bolt head of the fastening bolt 5 and the driving inclined surface at the tail of the guide wedge 61, the axial clamping force of the fastening bolt 5 is converted into a driving force for the guide wedge 61 to move along the guide countersunk hole 13. The radial thrust of the sliding causes the V-shaped guide edge 62 to wedge into the split joint. The return spring 14 is set in the guide countersunk hole 13 and abuts against the tail of the guide wedge 61. An annular compensation gap is left between the top edge of the floating pressure block 7 and the side wall of the mounting groove of the pressure cover 4. The elastic element is a set of multiple disc springs 71 evenly distributed in the circumferential direction between the top surface of the floating pressure block 7 and the bottom surface of the mounting groove. The annular compensation gap allows the floating pressure block 7 to wobble slightly when pressed to adapt to the uneven end face. The multiple sets of evenly distributed disc springs 71 provide uniform and adjustable elastic support force to ensure that the axial clamping force is evenly distributed, prevent local overpressure from causing bearing deformation, and absorb the height difference caused by assembly tolerance.

[0017] Specifically, the top surface of the base 1 has T-shaped grooves 11 with the same number of claws 3. The bottom of the claws 3 has T-shaped sliders 31 that match the T-shaped grooves 11. The outer side of the base 1 is threaded with an adjusting screw 12 that abuts against the side of the T-shaped slider 31. The cooperation between the T-shaped grooves 11 and the T-shaped sliders 31 restricts the claws 3 to move only radially, ensuring accurate clamping direction. The adjusting screw 12 can finely adjust the initial position of the claws 3, adapting to split bearings with different outer diameters, improving the versatility of the fixture and the pre-positioning accuracy before clamping. The top of the inner support positioning mandrel 2 is provided with a conical pressure cap 21 and a floating positioning cap. The mandrel 22 and the tapered pressure cap 21 are threaded to the top of the inner support positioning mandrel 2. The floating centering rod 22 slides through the center hole of the inner support positioning mandrel 2. The top of the floating centering rod 22 is provided with a ball head that fits against the inner conical surface of the tapered pressure cap 21. The tapered pressure cap 21 and the floating centering rod 22 cooperate to form a self-centering clamping mechanism. When the tapered pressure cap 21 is tightened, its inner conical surface presses down on the ball head at the top of the floating centering rod 22, forcing the floating centering rod 22 to move axially along the center hole of the inner support positioning mandrel 2 and automatically center, thereby achieving precise centering and flexible clamping of the inner ring of the split bearing, effectively avoiding clamping eccentricity and surface damage.

[0018] Working principle: When using this split bearing machining fixture, the two halves of the split bearing are first initially joined together and fitted onto the outside of the inner support positioning mandrel 2. Then, the conical pressure cap 21 is tightened, and its inner conical surface presses down on the ball head at the top of the floating centering rod 22, forcing the floating centering rod 22 to move axially along the center hole of the inner support positioning mandrel 2 and automatically center, achieving precise centering and flexible clamping of the inner ring of the split bearing. Next, the adjusting screw 12 is rotated to push the T-shaped slider 31 to move radially along the T-shaped slide groove 11, causing multiple claws 3 to retract towards the center to pre-clamp the outer circle of the bearing. Afterward, the pressure cap 4 is placed on top of the base 1 and the fastening bolt 5 is inserted. The fastening bolt 5 is tightened to press down the pressure cap 4, while the bottom surface of the bolt head of the fastening bolt 5 moves along the center hole. The driving inclined surface at the tail of the guide wedge 61 slides, pushing the guide wedge 61 to overcome the elastic force of the return spring 14 and slide along the guide countersunk hole 13 towards the split joint direction, so that the V-shaped guide edge 62 wedges into both sides of the joint. During this process, the floating pressure block 7, supported by multiple sets of disc springs 71, slightly deflects along the annular compensation gap and fits against the bearing end face. Continue to tighten the fastening bolt 5 until the cover 4 and the base 1 are completely locked. After the processing is completed, loosen the fastening bolt 5, and the return spring 14 pushes the guide wedge 61 to automatically return to its position. Rotate the conical pressure cap 21 in the opposite direction to release the clamping force of the floating centering rod 22 on the inner ring of the bearing. Then loosen the adjusting screw 12 to move the pawl 3 outward. Finally, remove the cover 4 and the bearing parts to complete a series of operations.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split bearing machining jig comprising a base (1), characterised in that: The top surface of the base (1) is fixed with an inner support positioning spindle (2). The top surface of the base (1) is provided with multiple claws (3) circumferentially sliding on the outer side of the inner support positioning spindle (2). A pressure cover (4) is provided above the base (1). The pressure cover (4) is connected to the base (1) by multiple fastening bolts (5). The top surface of the base (1) is provided with wedge-shaped centering components (6) symmetrically on both sides of the split joint of the split bearing. The bottom surface of the pressure cover (4) is provided with a floating pressure block (7) embedded in the mounting groove. The floating pressure block (7) is connected to the bottom surface of the mounting groove of the pressure cover (4) through an elastic element.

2. A split bearing machining fixture according to claim 1, wherein: The wedge centering assembly (6) includes a guide wedge (61) slidably disposed in the base (1). The tail of the guide wedge (61) is provided with a driving slope. The bottom surface of the bolt head of the fastening bolt (5) abuts against the driving slope of the guide wedge (61).

3. A split bearing machining fixture according to claim 2, wherein: The guide wedge (61) has a V-shaped guide edge (62) at one end near the split joint. The base (1) has a guide countersunk hole (13) for sliding the guide wedge (61). The guide countersunk hole (13) has a reset spring (14) that abuts against the tail of the guide wedge (61).

4. The split bearing machining fixture of claim 1, wherein: An annular compensation gap is left between the top edge of the floating pressure block (7) and the side wall of the mounting groove of the pressure cover (4). The elastic element is a set of disc springs (71) evenly distributed in the circumferential direction between the top surface of the floating pressure block (7) and the bottom surface of the mounting groove.

5. The split bearing machining fixture of claim 1, wherein: The top surface of the base (1) is provided with T-shaped grooves (11) in the same number as the claws (3). The bottom of the claws (3) is provided with T-shaped sliders (31) that are compatible with the T-shaped grooves (11). The outer side of the base (1) is threaded with an adjusting screw (12) that abuts against the side of the T-shaped slider (31).

6. A split bearing machining fixture according to claim 1, characterized in that: The top of the inner support positioning mandrel (2) is provided with a conical pressure cap (21) and a floating centering rod (22). The conical pressure cap (21) is threaded to the top of the inner support positioning mandrel (2). The floating centering rod (22) slides through the center hole of the inner support positioning mandrel (2). The top of the floating centering rod (22) is provided with a ball head that fits against the conical surface of the inner wall of the conical pressure cap (21).

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