Abrasive Brush Gap Calibration for Sheet Metal Deburring

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Solution Overview

Problem

Existing sheet metal processing machines face challenges in accurately adjusting rotating abrasive brushes to the thickness of sheet metal parts due to wear and speed-dependent diameter changes, leading to inefficient deburring and grinding.

Innovation Solution

A machine with a measuring device to detect the diameter of freely rotating abrasive brushes at different speeds, allowing for adaptive calibration and adjustment of the processing gap, compensating for wear and speed-dependent changes, using a light barrier for non-contact measurement and interpolation for accurate positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the processing gap is adjusted precisely for new abrasive brushes, then manufacturing precision is improved, but the processing gap becomes incorrect after wear occurs

Engineering Contradiction:

Improveprocessing gap accuracyVSAvoidconsistent performance over time

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The system performs preliminary measurement of the abrasive brush diameter at operating speed before processing begins. This allows the control unit to calculate and set the correct processing gap in advance, compensating for both wear and speed-dependent diameter changes before they affect processing quality.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The measuring device continuously or periodically measures the actual diameter of the rotating abrasive brush, and this measurement feedback is used by the control unit to dynamically adjust the processing gap. This closed-loop feedback ensures the processing gap remains accurate despite wear and speed variations.

Inventive Principle:

Principle #23Feedback

2Productivity

If the abrasive brush rotates at higher speeds, then productivity is improved, but the diameter increases due to centrifugal force causing processing gap errors

Engineering Contradiction:

Improveprocessing speedVSAvoidprocessing gap accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The system transitions from a static processing gap setting to a dynamic adjustment mechanism. The processing gap is automatically adjusted based on the measured diameter of the abrasive brush at its actual operating speed, allowing the system to maintain precision across varying speeds and productivity requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control unit changes the processing gap parameter based on measured diameter variations. By detecting the actual diameter at operating speed and calculating the corresponding processing gap, the system adapts the gap parameter to compensate for centrifugal force effects at different rotational speeds.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If a fixed processing gap is used, then device complexity is reduced, but manufacturing precision deteriorates due to wear and speed variations

Engineering Contradiction:

Improveadjustment mechanism simplicityVSAvoidprocessing gap accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The system replaces complex mechanical adjustment mechanisms with an automated measurement and control system. A measuring device detects the abrasive brush diameter, and a control unit automatically calculates and adjusts the processing gap, eliminating the need for manual measurement and adjustment while improving precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The abrasive brush essentially measures its own diameter through the non-contact measuring device, and this self-information is used by the control unit to automatically adjust the processing gap. The system serves itself by using the brush's actual state to determine the correct processing parameters.

Inventive Principle:

Principle #25Self-service

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

Ensures precise and adaptive adjustment of the processing gap regardless of abrasive brush wear and speed, maintaining effective deburring and grinding performance throughout the machine's operation.

Implementation Method 1

detecting the diameter of the freely rotating abrasive brush without contact, preferably using an optical measuring unit. Several measurements at different speeds are thus possible without any problems.

Methodology Applied

Scientific EffectLight absorption/interruption: Absorption (EM radiation)

Implementation Method 2

the individual bristles stand up due to centrifugal force as the speed increases, so that the diameter of the rotating abrasive brush increases, in particular at higher speeds.

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20240383098A1Machine for processing sheet metal parts

Publication Date: 2024.11.21 ARKU MASCHENBAU

AI summary

A machine for processing sheet metal parts includes a brush unit having at least one horizontally rotating abrasive brush for brushing the surface of the sheet metal parts to be processed. In order to adjust the processing gap or the infeed, the brush unit is movable in the vertical direction. A measuring device for measuring the diameter of the freely turning abrasive brush at different speeds may be designed as an optical measuring unit, in particular a light barrier. A calibration device is used to calculate the correct vertical position of the abrasive brush depending on a selected speed and the associated diameter of the abrasive brush.