Compact Grinding Device for Roller Spherical End Faces
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Solution Overview
Problem
Conventional grinding devices for spherical end faces of roller-shaped workpieces are large and lack the necessary machining accuracy, necessitating a more compact and precise solution.
Innovation Solution
A compact grinding device with a first and second rotary retaining member, a rotatable carrier, and a cup-shaped rotary grinding wheel, where the retaining members have opposing tapered rolling surfaces to apply axial and radial forces, allowing for improved workpiece support and machining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a C-shaped grinding wheel or cup-shaped grinding wheel is used with a large outside diameter carrier, then the grinding function is achieved, but the device size becomes large
Solution Approach 1:
The cup-shaped grinding wheel is nested within the carrier structure, with the grinding wheel axis passing through the carrier. This nesting arrangement allows the grinding wheel to be positioned compactly within the existing carrier boundaries, reducing the overall device volume while maintaining the necessary grinding functionality and precision.
Solution Approach 2:
The invention changes the spatial arrangement by inclining the workpiece central axis relative to the carrier central axis at a specific angle (15-45 degrees). This dimensional change allows the grinding operation to be performed in a different spatial orientation, enabling compact device design while achieving the required spherical end face grinding accuracy.
2Manufacturing precision
If the carrier outside diameter and grinding wheel outside diameter are increased, then the grinding capacity is improved, but the device complexity increases
Solution Approach 1:
The retaining member is segmented into two separate rotary retaining members (first and second) that rotate in opposite directions. Each retaining member has its own drive shaft and rolling surface, allowing independent control and optimization. This segmentation simplifies the overall structure by distributing the functional requirements across multiple simpler components rather than requiring a single complex retaining mechanism.
Solution Approach 2:
The invention employs tapered rolling surfaces on the rotary retaining members that are curved and inclined relative to the central axis. These curved surfaces naturally guide and support the workpiece in the desired inclined position, providing stable retention and accurate positioning without requiring complex mechanical constraints or adjustment mechanisms.
3Adaptability or versatility
If the workpiece axis is aligned with the carrier axis, then the structure is simplified, but the flexibility in adjusting workpiece curvature is reduced
Solution Approach 1:
The invention creates a dynamic relationship between the workpiece axis and carrier axis through the inclined configuration. The fixed inclination angle (15-45 degrees) between the workpiece central axis and carrier central axis provides a consistent geometric relationship that enables flexible adjustment of workpiece curvature while maintaining structural simplicity. This dynamic geometric arrangement allows the system to adapt to different workpiece requirements without complex adjustment mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves higher machining accuracy and reduced size by preventing coaxiality reduction between retaining members and allowing adjustment of the grinding wheel axis and workpiece curvature, resulting in improved precision and flexibility.
Implementation Method 1
an inner rotary retaining member (32) that has an annular outward rolling surface (34) formed of part of a radially outward tapered surface centering on a central axis (C) of the rotary drive shafts, and an outer rotary retaining member (33) that has an annular inward rolling surface (39) formed of part of a radially inward tapered surface centering on the central axis (C) of the rotary drive shafts. The rolling surfaces (34, 39) are opposed to each other.
Implementation Method 2
a cup-shaped rotary grinding wheel (26) disposed so as to be movable relative to the first rotary retaining member (32) and the second rotary retaining member (33)
Data Source
AI summary
An inner rotary retaining member has an annular outward rolling surface formed of part of a radially outward tapered surface centering on the central axis of a first rotary drive shaft. An outer rotary retaining member has an annular inward rolling surface formed of part of a radially inward tapered surface centering on the central axis of a second rotary drive shaft. The rolling surfaces are opposed to each other. A pocket that supports a workpiece such that the workpiece rotates and revolves as the retaining members rotate is formed at a portion of the carrier, the portion being positioned between the rolling surfaces. The central axis of the workpiece supported by the pocket is inclined relative to the central axis of the rotary drive shafts.