Grinding Tool Dressing via Continuous NC Axis Motion
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Solution Overview
Problem
The existing methods for dressing grinding tools using machine tools suffer from inaccuracies due to axis movement errors, particularly during direction reversals or standstills of NC axes, leading to deviations in the grinding tool geometry and subsequently in the workpiece machining accuracy.
Innovation Solution
The method involves moving NC axes along a dressing path without reversing direction or coming to a standstill, ensuring continuous sliding friction to maintain axial speeds greater than zero, using multiple NC axes such as linear, rotary, or swivel axes to generate a relative movement between the grinding tool and the form dressing roller, thereby avoiding static friction and its associated deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NC axes are used to traverse the dressing path automatically, then productivity and precision are improved, but axis movement errors during direction reversals or standstills cause manufacturing precision to deteriorate
Solution Approach 1:
The patent applies the continuity principle by ensuring that at least one NC axis maintains continuous motion without standstills or direction reversals during the dressing process. This is achieved by planning the dressing path and controlling axis movements so that the useful action of dressing continues uninterrupted, thereby eliminating stick-slip effects and maintaining high manufacturing precision while preserving automated productivity
Solution Approach 2:
The patent applies dynamics by transitioning from static friction states (during standstills) to continuous sliding friction states. By keeping at least one axis in continuous motion, the system maintains dynamic operation conditions that prevent the harmful static friction effects, thereby improving manufacturing precision while maintaining automated operation
2Ease of operation
If NC axes reverse direction or come to standstill during dressing, then the dressing path can be traversed completely, but stick-slip effects occur causing axis position accuracy to deteriorate
Solution Approach 1:
The patent ensures continuous motion of at least one NC axis throughout the dressing path traversal, eliminating standstills and direction reversals in that axis. This continuous action prevents stick-slip effects and maintains axis position accuracy, while the complete dressing path is still achieved through coordinated movement of multiple axes
Solution Approach 2:
The patent resolves the contradiction by utilizing multiple NC axes working in coordination. When one axis maintains continuous motion to avoid stick-slip effects, other axes can still complete the full dressing path traversal by moving in different dimensions, thereby maintaining both ease of operation and measurement precision
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
This approach enhances the precision and accuracy of the grinding tool dressing process, reducing manufacturing deviations in workpieces by preventing stick-slip effects and maintaining continuous contact during the dressing process.
Implementation Method 1
contact between the rotating grinding tool and the rotating form dressing roll along a dressing path
Implementation Method 2
the respective NC axis must be accelerated from a state of static friction to a state of sliding friction, resulting in a discontinuity in the temporal progression of the acting forces or a jerk (stick-slip effect)
Implementation Method 3
each of the NC axes generating the relative movement between the rotating grinding tool and the rotating form dressing roll has an axis speed whose magnitude is greater than zero, wherein none of these NC axes reverses direction or comes to a standstill
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
Method for dressing a grinding tool using a machine tool, comprising the process steps of: - providing a dressing grinding tool (12); - dressing the grinding tool (12) using a form dressing roll (18), - wherein the tool profile (10) to be produced on the grinding tool is formed by contact between the rotating grinding tool (12) and the rotating form dressing roll (18) along a dressing path (26), - wherein the dressing path is traversed automatically using two or more NC axes (X, Y, Z) of the machine tool (14) which generate a relative movement between the rotating grinding tool (12) and the rotating form dressing roll (18);characterized in that - during the traversing of the dressing path (26) and while the forming dressing roll (18) is in forming contact with the grinding tool (12), it is provided that - each of the NC axes (X, Y, Z) generating the relative movement between the rotating grinding tool (12) and the rotating forming dressing roll (18) has an axis speed whose magnitude is greater than zero, wherein none of these NC axes (X, Y, Z) reverses direction or comes to a standstill.;