Clamping and positioning device for fine grinding machining of bearing ring raceway with elastic supporting structure

Abstract

The invention discloses a clamping and positioning device for fine grinding machining of a bearing ring raceway of an elastic supporting structure, and relates to a fine grinding machining device of the bearing ring raceway of the elastic supporting structure. The technical problems that due to the fact that the axial width of a bearing ring of an elastic supporting structure is large, the machining precision is not stable, the percent of pass is low, and the product quality is not controlled are solved. The device comprises a tire pad, a C-shaped structure fulcrum and an oilstone clamp base, wherein the tire pad is of a full-plane structure. According to the device, the grinding tool and the ferrule are stably ground in the machining process, and the surface roughness and the profile tolerance are obviously improved. The method is used for fine grinding machining of the bearing ring raceway of the elastic supporting structure.

Description

Technical Field

[0001] This invention relates to a precision grinding apparatus for bearing raceways with elastic support structures. Background Technology

[0002] To achieve good bearing performance and a long service life, it is necessary to comprehensively consider factors such as bearing material, design structure, manufacturing process, bearing quality, lubrication conditions, installation conditions, and working environment. Precision grinding of the raceway is one of the key processes in bearing manufacturing, which can improve the bearing's precision and surface quality, reduce the coefficient of friction, and improve operating efficiency.

[0003] To better meet the performance requirements of bearings, the bearing structure design concept takes into account the bearing's operating environment and installation conditions. The design scheme adopts an integrated design, such as the spring support structure design and the structure design with mounting flanges. This increases the design difficulty, as well as the processing difficulty and the requirements for equipment processing capabilities.

[0004] The outer ring of a certain type of elastically supported cylindrical roller bearing (e.g.) Figure 1 For example, the axial width of the bearing rings reaches more than 70mm, which is three times the width of conventional bearings. This exceeds the processing range of conventional CNC precision grinding equipment. Due to the limited processing capacity of the equipment, the precision of the processed products is unstable, the pass rate is low (around 30%), the product quality is out of control, and delivery delays occur frequently, which seriously affects the delivery of the company's production tasks and the company's image.

[0005] Therefore, expanding the existing processing capabilities of the equipment is the primary task to improve the processing quality of cylindrical roller bearing rings with elastic support structures. Summary of the Invention

[0006] This invention addresses the technical problem of unstable machining accuracy, low pass rate (around 30%), and uncontrolled product quality in bearing rings with elastic support structures due to their large axial width. It provides a clamping and positioning device for precision machining of the raceway of such bearing rings.

[0007] A clamping and positioning device for precision grinding of bearing raceways with elastic support structure. The device includes: a pad, a C-shaped support, and an oilstone clamp base. The flange end face of the bearing raceway to be processed is positioned with the pad. The C-shaped support radially supports the bearing raceway. The oilstone clamp base drives the oilstone to repeatedly vibrate and grind the raceway surface of the bearing raceway. The thickness of the pad is determined according to the width of the bearing raceway to be processed. The thickness B of the fixed part of the support seat of the C-shaped support is increased. The axial dimension of the oilstone clamp base is extended, and the radial dimension of the oilstone clamp base is increased.

[0008] Furthermore, the tire pad has a completely flat structure.

[0009] Furthermore, the axial width of the ring to be processed is 25~80mm.

[0010] Furthermore, the axial width of the ring to be processed is 70~80mm.

[0011] Furthermore, the thickness B of the fixed part of the fulcrum of the C-shaped structure fulcrum is increased to 50mm.

[0012] Furthermore, the axial dimension of the oilstone clamp base is extended by 50mm.

[0013] Furthermore, the radial dimension of the oilstone clamp base is increased by 10mm.

[0014] Furthermore, the ring to be processed is positioned by the flange end face and the tire pad, and then rotates in a circular motion.

[0015] Beneficial effects of this invention:

[0016] (a) Regarding positioning support:

[0017] 1) Improve tire pad structure

[0018] The tire pad structure is designed to be fully flat (e.g.) Figure 2 The dimension H is determined based on the width of the ring to be processed, which shortens the effective distance between the fixture system and the processing area. By using the end face of the workpiece flange for positioning, the height of the pad in the Z-axis direction can be reduced, and the design datum and the processing datum can be unified.

[0019] 2) Change the support position

[0020] During bearing machining, the outer diameter surface of the raceway serves as the limiting support surface, and the axial position of the support outer diameter is the same as the axial position of the raceway. After resolving the tire pad issue, the problem of the support position being too high needs to be addressed. Analysis suggests using a C-type support structure (such as...). Figure 3 As shown, the system has good rigidity and stable support. Therefore, the support position is moved upward by increasing the thickness of the fulcrum B. The part of the fulcrum seat used for fixing is thickened from 10mm to 50mm. The processing requirements are met by improving the stability of the clamping system.

[0021] (ii) For oilstone clamps:

[0022] When machining irregularly shaped products with excessive width and height, the design of the oilstone clamp needs to avoid interference with the workpiece and related parts of the machine tool. To prevent interference during machining, the dimensions of the oilstone clamp also need to be adjusted accordingly. Based on the tooling fit dimensions of each part, the base of the oilstone clamp (such as...) needs to be adjusted. Figure 4 The axial dimension H is extended by 50mm, and the radial dimension is increased by 10mm. The machining conditions are met by increasing the rigidity of the oilstone clamp and ensuring the stability of the system.

[0023] After conducting precision machining tests on 100 sets of elastic support structure bearing rings with axial widths ranging from 25mm to 80mm using the new technology, the pass rate reached 90%, which is 60% higher than the pass rate before the improvement. During the machining process, the grinding wheel and the rings were ground smoothly, and the surface roughness and contour were significantly improved.

[0024] The optimized technical solution can be extended to the precision machining of raceways or grooves of bearing rings (inner and outer rings) in other elastic support structures.

[0025] This invention is used for precision grinding of the raceway of bearing rings in an elastic support structure. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the outer ring of a certain type of elastic support structure cylindrical roller bearing, i.e., the ring to be machined.

[0027] Figure 2 This is a schematic diagram of the tire pad structure;

[0028] Figure 3 A schematic diagram of a C-shaped support structure;

[0029] Figure 4 This is a schematic diagram of the structure of an oilstone clamp. Detailed Implementation

[0030] Specific Implementation Method 1: This implementation method describes a clamping and positioning device for precision grinding of the raceway of a bearing ring with an elastic support structure. The device includes: a pad, a C-shaped support point, and an oilstone clamp base. The flange end face of the ring to be processed is positioned with the pad. The C-shaped support point radially supports the ring to be processed. The oilstone clamp base drives the oilstone to repeatedly vibrate and grind the raceway surface of the ring to be processed. The thickness of the pad is determined according to the width of the ring to be processed. The thickness B of the fixed part of the support point of the C-shaped support point is increased. The axial dimension of the oilstone clamp base is extended, and the radial dimension of the oilstone clamp base is increased.

[0031] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the tire pad has a fully flat structure. Everything else is the same as in Specific Implementation Method One.

[0032] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the axial width of the ring to be processed is 25~80mm. Everything else is the same as in Specific Implementation Method One or Two.

[0033] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the axial width of the ring to be processed is 70~80mm. Everything else is the same as in Specific Implementation Methods One to Three.

[0034] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the thickness B of the fixed portion of the C-shaped structure support is increased to 50mm. Everything else is the same as in Specific Implementation Methods One to Four.

[0035] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the axial dimension of the oilstone clamp base is extended by 50mm. Everything else is the same as in Specific Implementation Methods One to Five.

[0036] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that the radial dimension of the oilstone clamp base is increased by 10mm. Otherwise, it is the same as Specific Implementation Methods One to Six.

[0037] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the ring to be processed is positioned by the flange end face and the tire pad, and performs a circular rotational motion. Everything else is the same as in Specific Implementation Methods One to Seven.

[0038] The scope of this invention is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the invention.

[0039] Example

[0040] This embodiment describes a clamping and positioning device for precision grinding of the raceway of a bearing ring with an elastic support structure. The device includes a pad, a C-shaped support, and an oilstone clamp base. The flange end face of the ring to be processed is positioned with the pad. The C-shaped support radially supports the ring to be processed. The oilstone clamp base drives the oilstone to repeatedly vibrate and grind the raceway surface of the ring to be processed. The thickness of the pad is determined according to the width of the ring to be processed. The thickness B of the fixed part of the support seat of the C-shaped support is increased. The axial dimension of the oilstone clamp base is extended, and the radial dimension of the oilstone clamp base is increased.

[0041] The ring to be processed is positioned by the flange end face and the tire pad, and then rotates in a circular motion.

[0042] The axial width of the ring to be processed is 25~80mm.

[0043] The thickness B of the fixed part of the fulcrum of the C-type structure fulcrum is increased to 50mm.

[0044] The axial dimension of the oilstone clamp base is extended by 50mm.

[0045] The radial dimension of the oilstone clamp base is increased by 10 mm.

[0046] After conducting precision machining tests on 100 sets of elastic support structure bearing rings with axial widths ranging from 25mm to 80mm using the new technology, the pass rate reached 90%, which is 60% higher than the pass rate before the improvement. During the machining process, the grinding wheel and the rings were ground smoothly, and the surface roughness and contour were significantly improved.

Claims

1. A clamping and positioning device for precision-machined raceways of bearing rings with elastic support structure, characterized in that... The device includes: a tire pad, a C-shaped structural support, and an oilstone clamp base. The flange end face of the ring to be processed is positioned with the tire pad. The C-shaped structural support radially supports the ring to be processed. The oilstone clamp base drives the oilstone to repeatedly vibrate and grind on the raceway surface of the ring to be processed. The thickness of the tire pad is determined according to the width of the ring to be processed. The thickness B of the fixed part of the support seat of the C-shaped structural support is increased. The axial dimension of the oilstone clamp base is extended, and the radial dimension of the oilstone clamp base is increased.

2. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The tire pad has a completely flat structure.

3. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The axial width of the ring to be processed is 25~80mm.

4. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The axial width of the ring to be processed is 70~80mm.

5. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The thickness B of the fixed part of the fulcrum of the C-type structure fulcrum is increased to 50mm.

6. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The axial dimension of the oilstone clamp base is extended by 50mm.

7. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The radial dimension of the oilstone clamp base is increased by 10 mm.

8. The clamping and positioning device for precision grinding of the raceway of the bearing ring with elastic support structure according to claim 1, characterized in that... The ring to be processed is positioned by the flange end face and the tire pad, and then rotates in a circular motion.

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