Bearing machining clamping device

Abstract

The utility model discloses a bearing processing clamping device relates to machining field, including chuck main part, elastic clamping mechanism, power drive unit and clamping element, chuck main part, including the chuck body for connecting lathe main shaft, the rear end of chuck body is provided with the pull rod connector for connecting the pull rod from lathe, elastic clamping mechanism includes the diaphragm setting in the front end of chuck body, and the outer edge between chuck body and diaphragm is fixedly connected, and at least three elastic spokes that distribute evenly along its circumferential direction and extend inwards radially are provided on the diaphragm, power drive unit provides the original axial force of making diaphragm deformation, including hydraulic cylinder or pneumatic cylinder, push rod and swivel joint, clamping element includes the claw setting with the end of elastic spoke. The utility model adopts the above structure and solves the problem of low repeat positioning accuracy, uneven clamping force leading to workpiece deformation, complex structure and poor cleanliness in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of high-precision machining technology, and in particular to a bearing machining clamping device. Background Technology

[0002] During bearing manufacturing, bearing rings need to be clamped multiple times on machine tools such as lathes and grinders to complete the precision machining of features such as raceways and flanges. The accuracy, rigidity, and stability of the clamping device directly determine the machining accuracy of the bearing rings, especially the form and position tolerances, such as roundness and wall thickness difference.

[0003] Currently, the clamping devices widely used in the bearing industry mainly include:

[0004] Screw-driven chucks: Clamping is achieved by rotating the screw with a wrench, which moves the helical teeth inside the chuck jaws. Its advantages include simple structure and high clamping force. However, it suffers from problems such as low repeatability, difficulty in controlling clamping force, and potential loss of accuracy due to thread backlash.

[0005] Wedge-type power chucks: These chucks use a cylinder or hydraulic cylinder to pull a lever, which in turn drives a wedge mechanism within the chuck to move the jaws radially. They offer a high degree of automation but have a complex structure with multiple sliding friction pairs, making them prone to wear and gaps, leading to decreased accuracy and uneven clamping force. Furthermore, the inherent "tilting effect" of the wedge mechanism can cause positioning errors in the jaws.

[0006] Spring collets: They have a small clamping range; a single type of spring collet can only accommodate workpieces with very small dimensional variations, resulting in poor versatility. For thin-walled workpieces, excessive clamping force can easily cause workpiece deformation.

[0007] In summary, the existing bearing processing clamping devices have the following main drawbacks:

[0008] Low repeatability: Due to factors such as thread clearance and wear of the wedge mechanism, it is difficult to maintain high accuracy for a long period of time.

[0009] Uneven clamping force can easily lead to workpiece deformation: The multiple jaws of a traditional chuck are difficult to achieve true synchronous concentric movement. The clamping force is concentrated at point or line contact, which can easily cause elastic deformation of thin-walled bearing rings. They may appear to be qualified during processing, but the deformation will recover after the clamping is removed, resulting in out-of-tolerance roundness of the product.

[0010] Complex structure and high maintenance cost: The wedge chuck has many sliding parts such as sliders and guide rails inside, which require frequent lubrication and maintenance. After wear, precision repair is difficult and costly.

[0011] Poor cleanliness: Sliding parts can easily trap chips and coolant, affecting the processing environment and the cleanliness of the workpiece.

[0012] Therefore, there is an urgent need to design a bearing processing clamping device to solve the above problems. Utility Model Content

[0013] To address the aforementioned challenges, this invention provides a bearing processing clamping device that solves the problems of low repeatability, uneven clamping force leading to workpiece deformation, complex structure, and poor cleanliness in the prior art.

[0014] To achieve the above objectives, this utility model provides a bearing processing clamping device, including a chuck body, an elastic clamping mechanism, a power drive unit, and clamping elements;

[0015] The chuck body includes a chuck body for connecting to the machine tool spindle, and a tie rod connector is provided at the rear end of the chuck body for connecting a tie rod from the machine tool; the elastic clamping mechanism includes a diaphragm provided at the front end of the chuck body, the outer edge of the diaphragm being fixedly connected to the chuck body, and at least three elastic spokes that are evenly distributed along their circumference and extend radially inward are provided on the diaphragm.

[0016] The power drive unit provides the original axial force to deform the diaphragm, including a hydraulic or pneumatic cylinder, a push rod, and a rotary joint;

[0017] The clamping element includes a pawl disposed at the end of the elastic spoke.

[0018] Preferably, the front end of the push rod is connected to the central region of the diaphragm or to a component that fixes the central region of the diaphragm, the hydraulic cylinder or pneumatic cylinder drives the push rod to move axially, and the rotary joint connects the hydraulic cylinder or pneumatic cylinder to the hydraulic pipeline or pneumatic pipeline.

[0019] Preferably, the chuck body further includes a front cover plate, which presses and fixes the outer edge of the diaphragm onto the chuck body.

[0020] Preferably, the clamping element further includes a positioning ring disposed on the chuck body or the front cover plate, the positioning ring being axially positioned with the workpiece.

[0021] Preferably, the claw is detachably mounted at the end of the elastic spoke by means of a fastener.

[0022] Preferably, the number of elastic spokes is 3-6.

[0023] Preferably, the push rod passes through the through hole of the machine tool spindle, the front end of the push rod is connected to the push rod connector of the chuck body, and the rear end of the push rod is connected to the piston of the hydraulic cylinder or pneumatic cylinder.

[0024] Therefore, the bearing processing clamping device described above has the following beneficial effects:

[0025] (1) Since the clamping motion of this utility model relies on the high-precision elastic deformation of the diaphragm itself, there are no sliding friction pairs and transmission gaps. Therefore, it can achieve extremely high repeatability (up to ±0.002mm or more), which is particularly suitable for the high-precision grinding process of bearing rings.

[0026] (2) Under axial tension, the multiple elastic spokes of this utility model generate synchronous and uniform radial contraction, making the clamping force of each jaw highly consistent. This surface contact uniform clamping can minimize or eliminate the clamping deformation of the thin-walled bearing ring, effectively ensuring the roundness accuracy of the workpiece.

[0027] (3) The entire device of this utility model eliminates complex transmission and sliding components such as wedge mechanism and screw, and the structure is extremely simple. With few moving parts and very few wear points, it has a long service life, is almost maintenance-free, and greatly reduces the cost of use.

[0028] (4) This utility model has no gaps or grooves that can trap dirt and grime, making it easy to clean and meeting the high requirements of modern precision manufacturing for the production environment.

[0029] (5) The diaphragm of this utility model has a rapid deformation response. When combined with hydraulic or pneumatic drive, it can achieve rapid clamping and loosening, thereby improving production efficiency.

[0030] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a bearing processing clamping device according to the present invention; Attached Figure Description

[0033] 1. Chuck body; 2. Diaphragm; 21. Elastic spokes; 3. Claws; 4. Push rod; 5. Hydraulic cylinder or pneumatic cylinder; 6. Rotary joint; 7. Front cover plate; 8. Positioning ring. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are for illustrative purposes only and are not intended to limit the scope of this invention.

[0036] Example

[0037] like Figure 1As shown, this utility model provides a bearing processing clamping device, including a chuck body, an elastic clamping mechanism, a power drive unit, and clamping elements;

[0038] The chuck body includes a chuck body 1 for connecting to the machine tool spindle, and a tie rod connector is provided at the rear end of the chuck body 1 for connecting a tie rod from the machine tool; the elastic clamping mechanism includes a diaphragm 2 provided at the front end of the chuck body 1, the outer edge of the diaphragm 2 is fixedly connected to the chuck body 1, and at least three elastic spokes 21 that are evenly distributed along their circumference and extend radially inward are provided on the diaphragm 2;

[0039] The power drive unit provides the original axial force to deform the diaphragm 2, including a hydraulic or pneumatic cylinder 5, a push rod 4, and a rotary joint 6;

[0040] The clamping element includes a pawl 3 disposed at the end of the elastic spoke 21. The pawl 3 is detachably disposed at the end of the elastic spoke 21 by means of fasteners. There are 3 to 6 elastic spokes 21.

[0041] The clamping element also includes a positioning ring 8 disposed on the chuck body 1 or the front cover plate 7, which axially positions the workpiece.

[0042] The front end of the push rod 4 is connected to the central area of ​​the diaphragm 2 or to a component that fixes the central area of ​​the diaphragm 2. The hydraulic cylinder or pneumatic cylinder 5 drives the push rod 4 to move axially. The rotary joint 6 connects the hydraulic cylinder or pneumatic cylinder 5 to the hydraulic pipeline or pneumatic pipeline.

[0043] Therefore, this utility model employs the aforementioned bearing processing clamping device, in which multiple elastic spokes synchronously and uniformly contract radially under axial tension, ensuring consistent clamping force across all jaws. This surface-contact, uniform clamping minimizes or eliminates clamping deformation of thin-walled bearing rings, effectively guaranteeing the roundness accuracy of the workpiece.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A bearing machining clamping device, characterized in that: Includes the chuck body, elastic clamping mechanism, power drive unit, and clamping elements; The chuck body includes a chuck body for connecting to the machine tool spindle, and a tie rod connector is provided at the rear end of the chuck body for connecting a tie rod from the machine tool; the elastic clamping mechanism includes a diaphragm provided at the front end of the chuck body, the outer edge of the diaphragm being fixedly connected to the chuck body, and at least three elastic spokes that are evenly distributed along their circumference and extend radially inward are provided on the diaphragm. The power drive unit provides the original axial force to deform the diaphragm, including a hydraulic or pneumatic cylinder, a push rod, and a rotary joint; The clamping element includes a pawl disposed at the end of the elastic spoke.

2. The bearing processing clamping device according to claim 1, characterized in that: The front end of the push rod is connected to the central area of ​​the diaphragm or to a component that fixes the central area of ​​the diaphragm. The hydraulic cylinder or pneumatic cylinder drives the push rod to move axially. The rotary joint connects the hydraulic cylinder or pneumatic cylinder to the hydraulic pipeline or pneumatic pipeline.

3. The bearing processing clamping device according to claim 1, characterized in that: The chuck body also includes a front cover plate, which presses and fixes the outer edge of the diaphragm onto the chuck body.

4. The bearing processing clamping device according to claim 3, characterized in that: The clamping element further includes a positioning ring disposed on the chuck body or the front cover plate, the positioning ring being axially positioned with the workpiece.

5. The bearing processing clamping device according to claim 1, characterized in that: The pawl is detachably mounted at the end of the elastic spoke via fasteners.

6. A bearing machining clamping device according to any one of claims 1-5, characterized in that: The number of elastic spokes is set to 3-6.

7. A bearing processing clamping device according to claim 2, characterized in that: The push rod passes through the through hole of the machine tool spindle, the front end of the push rod is connected to the push rod connector of the chuck body, and the rear end of the push rod is connected to the piston of the hydraulic cylinder or pneumatic cylinder.

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