Conical roller crowning device
By designing a tapered roller crown machining device, and utilizing the combination of spiral grooves and support plates, the problems of consistent crown profile and efficient machining of small rollers were solved, achieving stable and efficient machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- C&U CO LTD
- Filing Date
- 2024-06-19
- Publication Date
- 2026-05-12
AI Technical Summary
Existing technologies struggle to achieve consistent convexity profiles and efficient machining in small-scale roller processing, while traditional methods are complex and difficult to meet usage requirements.
A conical roller crown machining device was designed, including a grinding wheel, a support plate, and a guide wheel. Through the cooperation of the helical groove and the support plate, the roller rolls in the helical groove and moves along the support plate while performing axial grinding. Using helical positioning, the helical groove and the support plate are set facing each other, and the cooperation of the helical groove of the guide wheel and the support plate enables the roller to roll in the helical groove and move axially along the support surface of the support plate, ensuring effective contact and grinding between the roller and the grinding wheel.
实现了小型滚子的凸度加工过程稳定和一致性高，且装置结构简单，易于维护，提高了加工效率。
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Figure CN118617211B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a device for machining the crown of tapered rollers. Background Technology
[0002] Rollers are one of the four basic components of rolling bearings, serving to achieve rolling and transmit loads between the inner and outer rings. Due to the high-pair contact between the roller and raceway, surface stress is very high. Edge stress concentration often occurs in the contact area near the roller end face. To reduce or avoid edge stress concentration, the roller and raceway need to be modified by machining a certain raised shape on the roller surface generatrix, known as a "drum roller." Current roller machining generally includes four steps: forming, heat treatment, grinding, and ultra-precision honing. The crown profile of medium and large rollers is achieved through form grinding, while the generatrix modification of small rollers is completed in the ultra-precision stage. However, to improve production efficiency, small rollers are often machined using through grinding. Traditional through grinding cannot achieve the desired roller crown profile, and ultra-precision machining not only complicates guide wheel design but also produces inconsistent profiles, making it difficult to meet usage requirements. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides a tapered roller crown machining device. This device is simple, easy to maintain, and ensures high machining efficiency while maintaining a stable and consistent roller crown machining process.
[0004] To achieve the above objectives, the present invention provides a device for machining the crown of a tapered roller, comprising a grinding wheel, a support plate, and a guide wheel. The grinding wheel and the guide wheel are arranged facing each other, and a machining gap is formed between them. The support plate is disposed in the machining gap, and the support plate and the roller support surface are arranged below the axis of the grinding wheel and the guide wheel. A helical groove is provided on the outer circumferential surface of the guide wheel. The helical groove includes a thrust surface for contacting the large end face of the roller and a bottom surface for contacting the conical surface of the roller. The angle between the axis of the grinding wheel and the generatrix of the conical surface of the roller near the grinding wheel on the common plane is set as α. The angle between the generatrix of the bottom surface and the cylindrical surface of the guide wheel is the groove bottom angle β. The angle α varies with the position of the roller along the axis of the guide wheel, and the effective grinding width of the grinding wheel is set as L. Se The effective length of the roller is set to L. we The dimensionless position of the roller at the starting grinding point is x = 0, and the dimensionless position of the roller at the grinding endpoint is x = 1. The x-coordinate represents the position along the length of the generatrix of the roller cone surface, and the y-coordinate represents the convexity value of the roller cone surface profile. Using the effective length of the roller as the unit of measurement, the dimensionless form of the convexity curve is Y = Y(X), where... Any point (x) on the original convexity curve i ,y i The angle α of the tangent on the line is the angle of inclination. iCorresponding point (x) to the dimensionless convexity curve i ,y i The angles of inclination of the tangents are equal. L Se With L we When the difference is set as a unit of measurement to define the axial position of the roller along the guide rail,
[0005] L Se With L we When the sum is set as a unit of measurement to define the axial position of the roller along the guide rail, In the formula, Φ is the cone angle of the roller.
[0006] The advantages of this setup are as follows: The roller to be processed is placed in the helical groove of the guide wheel and above the top of the support plate, supported by the support plate and axially positioned by the helical groove. The large end face of the roller contacts the thrust surface of the helical groove; the conical surface of the roller contacts the bottom surface of the helical groove and the supporting surface of the top of the support plate, respectively. Here, the angle formed between the generatrix of the bottom surface and the cylindrical surface of the guide wheel is the groove bottom angle, and the angle between the bottom surface of the helical groove and the thrust surface of the helical groove is the groove edge angle. During processing, the roller is driven by the guide wheel and the grinding wheel, rolling in the helical groove while moving axially along the supporting surface of the support plate. On the conical surface of the roller near the grinding wheel, the generatrix passing through the first grinding point is coplanar or nearly coplanar with the axis of rotation of the grinding wheel. The generatrix of the roller's conical surface and the axis of the grinding wheel form an angle α in a common plane. This angle α varies with the position of the roller along the axial direction of the guide wheel, changing from a positive value through zero to a negative value, or from a negative value through zero to a positive value. Correspondingly, the groove bottom angle along the axial direction of the guide wheel increases or decreases, while the groove edge angle remains constant and does not change with the axial position of the spiral groove. This structure has a simple overall layout and is easy to maintain. Under the premise of ensuring high processing efficiency, it makes the roller crown processing process stable and highly consistent.
[0007] As a further feature of the present invention, the support surfaces of the pallet and the roller are arranged in an arc shape or an inclined surface.
[0008] The beneficial effects of this design are: by effectively increasing the support area, the roller can be supported more stably, ensuring the processing stability of the roller and resulting in good performance.
[0009] As a further feature of the present invention, the end face of the grinding wheel is connected to the grinding surface of the grinding wheel through a smooth transition surface.
[0010] The advantages of this design are: it ensures the grinding quality of the grinding wheel edge, while its simple structure, ease of implementation, and good performance. Attached Figure Description
[0011] Figure 1This is a schematic diagram of the structure of an embodiment of the present invention;
[0012] Figure 2 This is a schematic diagram of the grinding process according to an embodiment of the present invention;
[0013] Figure 3a This is a schematic diagram showing the effective length of the roller when the origin of the convexity curve coordinate is located at the large end of the roller.
[0014] Figure 3b This invention shows the roller crown curve when the origin of the crown curve coordinates is located at the large end of the roller;
[0015] Figure 4a This is a schematic diagram showing the effective length of the roller when the origin of the convexity curve coordinate is located at the small end of the roller.
[0016] Figure 4b This invention shows the roller crown curve when the origin of the crown curve coordinates is located at the small end of the roller;
[0017] Figure 5 This is a schematic diagram illustrating the positive change of the roller angle in this invention;
[0018] Figure 6 This is a schematic diagram illustrating the reverse change of the roller angle in this invention. Detailed Implementation
[0019] Examples of embodiments of the tapered roller crown machining apparatus of the present invention Figure 1 , Figure 2 Figure 3 and Figure 5 The system includes a grinding wheel 1, a support plate 3, and a guide wheel 2. The grinding wheel 1 and the guide wheel 2 are arranged facing each other, forming a machining gap between them. The support plate 3 is positioned within the machining gap, and its support surface is lower than the axes of the grinding wheel and the guide wheel 2. The outer circumferential surface of the guide wheel 2 has a spiral groove 21, which includes a thrust surface for contacting the large end face of the roller and a bottom surface for contacting the conical surface of the roller. The angle between the axis of the grinding wheel 1 and the generatrix of the conical surface of the roller near the grinding wheel 1 in a common plane is set as α. The angle between the generatrix of the bottom surface and the cylindrical surface of the guide wheel 2 is the groove bottom angle β. The angle α varies with the position of the roller along the axis of the guide wheel. The effective grinding width of the grinding wheel is set to L. Se The effective length of the roller is set to L. we The dimensionless position of the roller at the starting grinding point is x = 0, and the dimensionless position of the roller at the grinding endpoint is x = 1. The x-coordinate represents the position along the length of the generatrix of the roller cone surface, and the y-coordinate represents the convexity value of the roller cone surface profile. Using the effective length of the roller as the unit of measurement, the dimensionless form of the convexity curve is Y = Y(X), where...
[0020] Any point (x) on the original convexity curvei ,y i The angle α of the tangent on the line is the angle of inclination. i Corresponding point (x) to the dimensionless convexity curve i ,y i The angles of inclination of the tangents are equal.
[0021]
[0022] L Se With L we When the difference is set as a unit of measurement to define the axial position of the roller along the guide rail,
[0023] L Se With L we When the sum is set as a unit of measurement to define the axial position of the roller along the guide rail, In the formula, Φ is the cone angle of the roller.
[0024] The advantages of this setup are as follows: The roller to be processed is placed in the helical groove of the guide wheel and above the top of the support plate, supported by the support plate and axially positioned by the helical groove. The large end face of the roller contacts the thrust surface of the helical groove; the conical surface of the roller contacts the bottom surface of the helical groove and the supporting surface of the top of the support plate, respectively. Here, the angle formed between the generatrix of the bottom surface and the cylindrical surface of the guide wheel is the groove bottom angle, and the angle between the bottom surface of the helical groove and the thrust surface of the helical groove is the groove edge angle. During processing, the roller is driven by the guide wheel and the grinding wheel, rolling in the helical groove while moving axially along the supporting surface of the support plate. On the conical surface of the roller near the grinding wheel, the generatrix passing through the first grinding point is coplanar or nearly coplanar with the axis of rotation of the grinding wheel. The generatrix of the roller's conical surface and the axis of the grinding wheel form an angle α in a common plane. This angle α varies with the position of the roller along the axial direction of the guide wheel, changing from a positive value through zero to a negative value, or from a negative value through zero to a positive value. Correspondingly, the groove bottom angle along the axial direction of the guide wheel increases or decreases, while the groove edge angle remains constant and does not change with the axial position of the spiral groove. This structure has a simple overall layout and is easy to maintain. Under the premise of ensuring high processing efficiency, it makes the roller crown processing process stable and highly consistent.
[0025] Figure 3a , Figure 4a The effective length of the roller is defined. Figure 3b , Figure 4b This displays the variation of the roller crown curve along the generatrix of the roller cone surface. The x-coordinate represents the position along the length of the generatrix, and the y-coordinate represents the crown value of the roller cone profile. Figure 3a This displays the case where the origin O of the coordinate system is selected at the large end of the roller, and the positive x-coordinate points to the small end. Figure 4aThis displays the case where the origin O of the coordinate system is selected at the small end of the roller, and the positive x-axis points towards the large end. If the effective length of the roller is used as the unit of measurement, the convexity curve can be represented in a dimensionless form.
[0026] Y=Y(X), where
[0027] Any point (x) on the original convexity curve i ,y i The angle α of the tangent on the line is the angle of inclination. i Corresponding point (x) to the dimensionless convexity curve i ,y i The angles of inclination of the tangents are equal.
[0028]
[0029] like Figure 5 As shown, L Se With L we When the difference is set as a unit of measurement to define the axial position of the roller along the guide rail, Figure 5 In the grinding process, when the roller is in the initial grinding position x = 0, the intermediate grinding position x = 0.5, and the final grinding position x = 1.0, the changes in the groove bottom angle β and the angle between the roller generatrix and the grinding wheel axis are as follows: At the initial position, the groove bottom angle β is the smallest, less than the roller cone angle φ, β = φ - Δφ. At the intermediate grinding position, the groove bottom angle β is equal to the roller cone angle φ. At the final grinding position, the groove bottom angle is the largest, greater than the roller cone angle φ, β = φ + Δφ. For any given position X = X... i Above, φ and β i The difference is equal to the same dimensionless position X i See above. Figure 3a and Figure 3b The inclination angle α of the convexity curve tangent i ,
[0030]
[0031] As shown in Figure 4 and Figure 6 As shown, Figure 4a The origin O of the coordinate system describing the roller crown curve is chosen at the small end of the roller. The positive x-axis points towards the large end, as shown below. Figure 6 As shown, L Se With L weWhen the sum is set as the unit of measurement to define the axial position of the roller along the guide rail, the changes in the groove bottom angle β and the angle between the roller generatrix and the grinding wheel axis are as follows when the roller is in the initial grinding position x=0, the intermediate grinding position x=0.5, and the final grinding position x=1.0: At the initial position, the groove bottom angle β is the largest, greater than the roller cone angle φ, β=φ+△φ. At the intermediate grinding position, the groove bottom angle β is equal to the roller cone angle φ. At the final grinding position, the groove bottom angle is the smallest, less than the roller cone angle φ, β=φ-△φ. For any given position X=X... i Above, β i The difference between φ and the same dimensionless position X i See above. Figure 4a and Figure 4b The inclination angle α of the convexity curve tangent i ,
[0032]
[0033] As a further feature of this embodiment, the support surfaces of the pallet and the roller are arranged in an arc shape or an inclined surface.
[0034] The beneficial effects of this design are: by effectively increasing the support area, the roller can be supported more stably, ensuring the processing stability of the roller and resulting in good performance.
[0035] As a further feature of this embodiment, the end face of the grinding wheel is connected to the grinding surface of the grinding wheel through a smooth transition surface.
[0036] The advantages of this design are: it ensures the grinding quality of the grinding wheel edge, while its simple structure, ease of implementation, and good performance.
[0037] The above examples are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.
Claims
1. A device for machining the crown of tapered rollers, characterized in that: The system includes a grinding wheel, a support plate, and a guide wheel. The grinding wheel and guide wheel are positioned facing each other, with a machining clearance between them. The support plate is positioned within the machining clearance, and its support surface is lower than the axes of the grinding wheel and guide wheel. A helical groove is formed on the outer circumference of the guide wheel. The helical groove includes a thrust surface for contacting the large end face of the roller and a bottom surface for contacting the conical surface of the roller. The angle α between the axis of the grinding wheel and the generatrix of the conical surface of the roller near the grinding wheel on a common plane is defined as α. The angle β between the bottom surface and the generatrix of the cylindrical surface of the guide wheel is defined as the groove bottom angle. The angle α varies with the position of the roller along the axis of the guide wheel. The effective grinding width of the grinding wheel is set to L. Se The effective length of the roller is set to L. we The dimensionless position of the roller at the starting grinding point is x = 0, and the dimensionless position of the roller at the grinding endpoint is x = 1. The x-coordinate represents the position along the length of the generatrix of the roller cone surface, and the y-coordinate represents the convexity value of the roller cone surface profile. Using the effective length of the roller as the unit of measurement, the dimensionless form of the convexity curve is Y = Y(X), where... Any point (x) on the original convexity curve i ,y i The angle α of the tangent on the line is the angle of inclination. i Corresponding point (x) to the dimensionless convexity curve i ,y i The angles of inclination of the tangents are equal. L Se With L we When the difference is set as a unit of measurement to define the axial position of the roller along the guide rail, L Se With L we When the sum is set as a unit of measurement to define the axial position of the roller along the guide rail, In the formula, Φ is the cone angle of the roller.
2. The tapered roller crown machining device according to claim 1, characterized in that: The support surfaces of the pallet and roller are arranged in an arc shape or an inclined surface.
3. The tapered roller crown machining device according to claim 2, characterized in that: The end face of the grinding wheel is connected to the grinding surface of the grinding wheel through a smooth transition surface.