CNC Grinding Machine for Non-Round Workpiece Profile Machining
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Solution Overview
Problem
Existing grinding machines are unsuitable for machining workpieces with non-round cross-sections, non-parallel longitudinal contours, and off-centred terminal portions, particularly those with small cross-sections, as they are prone to bending or breaking due to the lever effect during machining.
Innovation Solution
A CNC grinding machine with a spindle for rotating and translating workpieces, and two abrasive wheels that rotate and translate obliquely to grind peripheral portions, allowing for precise positioning and movement control to minimize the lever effect and ensure reliable machining of elongated workpieces with complex profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grinding machines are used to machine workpieces with non-round cross-sections and off-centred terminal portions, then the workpieces are prone to bending or breaking due to the lever effect, but using specialized grinding machines increases device complexity and machining costs
Solution Approach 1:
The invention employs dynamic control of the abrasive wheel positioning system, allowing the wheel to move along a programmed trajectory that adapts to the workpiece geometry. The abrasive wheel's position is continuously adjusted based on the workpiece rotation angle and axial position, enabling the machine to handle varying workpiece shapes without structural modification. This dynamic positioning resolves the contradiction by maintaining reliability through adaptive control rather than complex specialized structures.
Solution Approach 2:
The invention changes the control parameters of the grinding process by implementing CNC control that coordinates the rotation speed, axial feed rate, and abrasive wheel radial/axial positions as interdependent variables. The control system adjusts these parameters dynamically based on the workpiece profile, allowing the same machine to reliably machine different geometries including non-round cross-sections and off-centred portions without increasing device complexity.
2Manufacturing precision
If conventional grinding machines with fixed abrasive wheel positions are used, then the machining of complex profiles requires successive corrections and permanent survey, but this increases loss of time and requires specialist intervention
Solution Approach 1:
The invention replaces manual mechanical adjustment and optical survey systems with CNC numerical control. The control system uses programmed coordinates to automatically position the abrasive wheel and control its movement, substituting the need for specialist survey and manual correction. This achieves high manufacturing precision through digital control while eliminating the time loss associated with manual setup and successive corrections.
Solution Approach 2:
The CNC control system enables the grinding machine to automatically control its own positioning and movement without continuous specialist intervention. The programmed trajectory allows the machine to self-correct and self-position the abrasive wheel throughout the machining process, achieving precise profile machining while reducing the need for external specialist survey and adjustment.
3Adaptability or versatility
If grindstones are used to grind the entire longitudinal contour simultaneously, then workpieces with non-parallel longitudinal contours and negative slopes cannot be machined, but adapting grindstone profiles increases device complexity
Solution Approach 1:
The invention makes the abrasive wheel positioning dynamic rather than fixed, allowing the wheel to move radially and axially during the grinding process. This dynamic capability enables the machine to machine workpieces with non-parallel longitudinal contours and negative slopes by adjusting the wheel position in real-time, achieving versatility without requiring complex pre-profiled grindstones.
Solution Approach 2:
The invention adds dimensional freedom by allowing the abrasive wheel to move not only radially but also axially during grinding. This multi-dimensional movement capability enables the machine to accommodate various workpiece geometries including non-parallel contours by adjusting the wheel position in multiple directions, achieving adaptability without complicating the grindstone itself.
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 solution enables reliable and economical machining of small, elongated workpieces with non-round cross-sections and off-centred terminal portions, reducing the risk of bending or breaking and allowing for the production of workpieces with complex profiles, including non-parallel and convex/concave contours, while minimizing machining time and costs.
Implementation Method 1
a first abrasive wheel (6) arranged to rotate around a second axis (61) and to translate along a third axis (62)... such as to grind a peripheral portion (103) of the workpiece (1)
Data Source
AI summary
The invention concerns a method for machining a workpiece (1) by a grinding machine, comprising the step of rotating and translating the workpiece along a first axis (4) toward the first abrasive wheel; rotating an abrasive wheel (6) around a second axis (61) and translating it along a third axis (62) such that the abrasive wheel grinds a peripheral portion (103) of the workpiece; the abrasive wheel being positioned in a position in translation along the third axis; and wherein the position in translation is determined as a function of a position and of an angular position of the workpiece around the first axis. The invention further related to a grinding machine for carrying out such method.