Perforation Device Variable Speed Ratio Gear Train
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Solution Overview
Problem
Existing perforation devices with rotating cutting tools struggle to effectively remove chips formed during the perforation process, as regular feed produces long, hard-to-remove chips due to a fixed speed ratio between rotation and translation, degrading hole geometry and surface quality.
Innovation Solution
A perforation device with a gear train that synchronizes rotation and translation driving mechanisms, allowing for a variable speed ratio between the cutting tool's rotation and translation, ensuring the speed of translation is zero at least once during a rotation, breaking up chips into shorter, easier-to-remove pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting tool is driven with a fixed speed ratio between rotation and translation, then the perforation process is stable and continuous, but long chips are formed that are difficult to remove
Solution Approach 1:
The patent applies periodic action by inverting the speed ratio between rotation and translation at least once during one rotation of the cutting tool using a gear train. This periodic inversion causes the translation speed to become zero momentarily, which breaks up the chips formed during perforation. The gear train mechanism (with driving pinion and transmission pinion) creates this periodic variation, transforming the continuous harmful chip formation into periodic chip breaking, thereby resolving the contradiction between continuous operation and chip removal.
2Ease of operation
If the translation speed is maintained constantly during rotation, then the perforation process is simple to control, but chip removal becomes difficult
Solution Approach 1:
The patent applies dynamics by making the speed ratio between rotation and translation variable during the rotation of the cutting tool. The gear train mechanism dynamically adjusts the translation speed, causing it to vary periodically and become zero at least once per rotation. This dynamic control, while more complex than constant speed control, effectively breaks up chips and prevents their entrapment, resolving the contradiction between operational simplicity and chip removal effectiveness.
3Productivity
If regular feed is applied during perforation, then the perforation process is efficient, but long helical chips are produced that degrade hole geometry
Solution Approach 1:
The patent uses periodic action through the gear train to invert the speed ratio periodically during rotation, causing the translation speed to become zero at least once per rotation. This periodic interruption of the regular feed breaks up the long helical chips that would otherwise form and degrade hole geometry. The periodic chip breaking maintains perforation efficiency while significantly improving hole geometry by preventing chip entrapment and surface degradation.
Data Source
AI summary
The invention concerns a perforating device comprising a cutting tool (10), means for rotating (11) the cutting tool (10) and means for translating (12, 14) the cutting tool (10), the ratio between the rotational speed and the translational speed being variable during rotation of the cutting tool (10). It comprises a gear train (16, 17; 18, 19) for synchronizing the rotating means (11) with the translating means (12, 14). The speed ratio between a driving pinion (16; 18) of the gear train, rotationally linked to the means (11) for rotating the cutting tool (10) and a transmission pinion (17; 19) of the translating means is reversed at least once during one rotation of the cutting tool (10). The invention is useful for fragmenting the resulting shavings.