Oscillating Grinding Machine Spherical Head
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Solution Overview
Problem
Existing oscillating grinding machines with two-dimensional movement create uneven grinding results, leading to crater-like recesses and semilunar craters due to lateral movement and difficulty in maintaining straight contact with the surface, especially when grinding small defects in painted or lacquered surfaces.
Innovation Solution
A grinding machine with a spherical oscillation movement, where the drive shaft is directly driven by a motor, and the grinding head features a spherical fastening surface, allowing for three-dimensional movement and higher grinding precision with flexible abrasives, reducing the need for exact positioning and minimizing edge defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-dimensional oscillation movement is used in the grinding machine, then the structure is simple and easy to manufacture, but the grinding precision deteriorates and uneven grinding results occur
Solution Approach 1:
The patent transitions from two-dimensional oscillation movement to three-dimensional spherical oscillation movement. The fastening plate is designed with a spherical upper surface that allows the grinding product to move in three dimensions (x, y, z coordinates) rather than just two dimensions, enabling the grinding point to cover the entire surface area uniformly and eliminate uneven grinding results
2Productivity
If the outer edge of the grinding product is used for grinding, then grinding efficiency is high, but uneven grinding results and crater-like defects are created
Solution Approach 1:
The spherical oscillation movement allows the grinding product to move vertically (z-direction) in addition to horizontal movements, enabling the entire surface area including the outer edge to contribute to grinding uniformly. This three-dimensional movement distributes the grinding action across all areas rather than concentrating it at the outer edge, maintaining high efficiency while preventing crater-like defects
3Ease of operation
If the grinding machine is manually supported at a remote upper plane, then ease of operation is improved, but lateral movements and swaying increase
Solution Approach 1:
The spherical oscillation mechanism inherently compensates for lateral movements and swaying by allowing movement in three dimensions. The spherical geometry ensures that even when the machine sways or moves laterally, the grinding contact point maintains proper alignment through the additional degree of freedom provided by the spherical movement, reducing the impact of manual support instability
4Ease of manufacture
If the fastening plate has a planar upper surface, then manufacturing is simple, but the grinding area cannot maintain complete straight contact with the surface
Solution Approach 1:
The patent replaces the planar upper surface of the fastening plate with a spherical surface. This curvature allows the grinding product to maintain complete straight contact with the workpiece surface throughout the oscillation cycle, as the spherical geometry naturally accommodates the contact point moving across the entire surface area while maintaining proper alignment
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 machine achieves a smoother interface between ground and non-ground areas, reduces the size of the grinding area, and prevents semilunar or crater-like defects, enabling precise grinding and polishing with improved stability and ease of use.
Implementation Method 1
a fastening plate (9) which is arranged to obtain an oscillating movement through a drive shaft (4, 10, 11) with an eccentric arrangement
Implementation Method 2
grinding with different types of oscillating tools in repairing work involving colour or lacquer damage
Data Source
AI summary
The present invention relates particularly to an oscillating grinding machine. The grinding machine comprises a driving motor (3) surrounded by a body (3), and a drive shaft (4) cooperating with the driving motor. The drive shaft comprises a grinding head (5) that constitutes a support for a grinding product (8). The drive shaft (4) is arranged in two pieces and comprises a main shaft (11) and an eccentric shaft (10) arranged rigidly thereto. The eccentric shaft comprises a center line (12) that assumes an angle (α) against a corresponding center line (13) of the main shaft, and thus the grinding head (5) will assume an eccentric placement in relation to the main shaft (11). Thus, the grinding head is arranged to oscillate in a substantially spherical plane provided by the rotation of the main shaft and the eccentricity and inclination of the eccentric shaft in relation to the main shaft.