Spherical Lapping Machine with Adjustable Discs
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Solution Overview
Problem
Existing lapping machines are inefficient in producing perfectly spherical objects with smooth surfaces, particularly in ball and socket geometries, due to side loads from gravity and lack of precision, leading to surface irregularities and high labor costs in manual buffing processes.
Innovation Solution
A lapping machine with a free rolling spherical lap arrangement and a telescopic rod, utilizing an elliptical gear drive mechanism and micro-stepper motor with precision belt configurations, allowing for adjustable alignment and programmable motion profiles to replicate manual orbital motions with high precision and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lapping machines with fixed disc configurations are used, then mass production of spherical objects is efficient, but the equipment is expensive and difficult to adjust for different shapes and sizes
Solution Approach 1:
The patent implements dynamically adjustable lapping disc configurations where the upper and lower discs can be independently positioned at various radial distances from the rotation axis. This dynamic adjustment capability allows the same machine to accommodate different spherical workpiece sizes and geometries (such as ball and socket joints) without requiring expensive equipment redesign, thereby resolving the contradiction between mass production efficiency and adaptability.
Solution Approach 2:
The lapping machine is segmented into independently controllable upper and lower disc units, each capable of separate radial positioning. This segmentation enables flexible configuration of the lapping geometry to match different workpiece requirements while maintaining the ability to perform high-volume production operations, thus balancing productivity with versatility.
2Manufacturing precision
If manual buffing is used to achieve smooth surfaces, then surface quality can be improved, but labor costs increase and the process is time-consuming
Solution Approach 1:
The patent replaces manual buffing operations with an automated lapping machine that uses controlled orbital and rotational motions of abrasive discs. The machine substitutes human labor with programmable motion control systems that replicate and enhance manual buffing techniques, achieving comparable surface smoothness while dramatically increasing production speed and reducing labor costs.
Solution Approach 2:
The lapping machine enables continuous automated lapping operations without the interruptions inherent in manual buffing. The machine can maintain consistent lapping pressure, speed, and motion patterns throughout extended operation periods, producing smooth surfaces continuously and eliminating the time-consuming nature of manual processes while preserving surface quality.
3Manufacturing precision
If existing lapping machines are used, then spherical workpieces can be produced, but side loads from gravity affect precision and create surface irregularities
Solution Approach 1:
The patent employs an overhead support structure that provides upward support forces to counteract the gravitational side loads acting on the upper lapping disc and workpiece. This counterweight mechanism eliminates the harmful gravitational effects that cause surface irregularities, enabling high-precision sphericity accuracy while maintaining the necessary lapping forces for surface smoothing.
4Measurement precision
If coordinate measuring machines with touch probes are used, then measurement precision is achieved, but the probes accumulate materials and require complex re-constitution
Solution Approach 1:
The lapping machine incorporates self-cleaning features and easy-access tooling changes that allow rapid replacement or maintenance of worn components without requiring complex disassembly or specialized tools. The design enables operators to quickly remove accumulated materials or exchange probes using simple mechanisms, thereby maintaining measurement precision while dramatically simplifying maintenance compared to conventional CMM probes.
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 precise and reproducible lapping of spherical workpieces with reduced surface irregularities, eliminating side loads and enabling efficient production of smooth surfaces, adaptable to various sizes and shapes, and scalable for larger components.
Implementation Method 1
Precision belt configurations allow for the upper and lower unit to be driven by a single micro-stepper motor
Implementation Method 2
The upper unit may include a unique geared drive mechanism that utilizes an elliptical gear drive train
Implementation Method 3
abrasive slurry is introduced between the upper and lower discs to provide an abrasive action to smooth spherical objects
Implementation Method 4
surfaces are rubbed together with an abrasive between them
Implementation Method 5
The present disclosure utilizes a free rolling spherical lap arrangement in the lower unit
Implementation Method 6
The micro-stepper motor is equipped with an absolute encoder, providing continuous feedback to the controller regarding motor speed and torque
Data Source
AI summary
A lapping machine that can reproduce novel lapping patterns for generally spherical workpieces. The lapping machine replicates the motions commonly used in manual lapping, but with full reproducibility. The desired patterns of lapping are representative of roulette curves, and the present disclosure describes a novel means to produce roulette curve lapping of spherical workpieces by machine. The lapping machine may utilize a free rolling spherical lap arrangement in the lower unit and a telescopic rod and spherical lap in an upper unit. Different tools for holding the workpiece allow for easy adjustment to a variety of work piece sizes and shapes.