Stop-Surface Cam Grooving for Precise Pipe Groove Radius
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Solution Overview
Problem
Existing roll grooving machines face challenges in producing circumferential grooves in pipe elements with the required precision and efficiency, often requiring complex devices and significant operator involvement, with low production rates and difficulties in achieving the desired groove radius.
Innovation Solution
A cam-based system comprising a cam body with a surface featuring regions of increasing and constant radius, traction surfaces, and stop surfaces, which engage with the pipe element to form a groove through synchronized rotation, allowing for precise groove formation with reduced operator intervention and increased production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If roll grooving machines use actuators and adjustable roller travel to achieve desired groove radius, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The cam surface is designed with a predetermined profile that automatically guides the roller to apply force at the correct location and angle, enabling the device to self-regulate groove formation without external actuators or operator adjustment. The cam geometry inherently controls the roller's motion path and engagement depth, achieving precise groove radius through the cam's fixed geometric properties rather than active control systems.
Solution Approach 2:
The invention changes the fundamental parameter of groove formation from active control (actuators adjusting roller position) to passive geometric constraint (cam surface profile). By encoding the desired groove radius into the cam's physical geometry, the system transforms a dynamically controlled process into a statically defined one, where precision is determined by cam manufacturing accuracy rather than actuator control accuracy.
2Manufacturing precision
If roll grooving machines require operator adjustment of roller travel to achieve desired groove radius, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The cam mechanism eliminates the need for operator intervention in adjusting roller travel. The cam surface's predetermined profile automatically positions and guides the roller throughout the grooving operation, making the device self-sufficient and removing the burden of manual adjustment from the operator while maintaining precise groove formation.
Solution Approach 2:
The cam surface is pre-configured with the exact geometry needed to achieve the desired groove radius. This preliminary action of encoding the solution into the cam's physical form during manufacturing eliminates the need for real-time operator adjustments, allowing the operator to simply operate the device without specialized knowledge or adjustment skills.
3Manufacturing precision
If roll grooving machines require many revolutions of the pipe element to achieve a finished circumferential groove, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The cam surface is designed to maintain continuous and consistent engagement with the pipe element throughout the grooving operation. The predetermined cam profile ensures that the roller applies force continuously along the intended path, eliminating idle revolutions or back-and-forth adjustments, thereby achieving complete groove formation in fewer pipe element revolutions and increasing production rate.
Solution Approach 2:
The cam mechanism dynamically adapts the roller's position and force application during rotation, optimizing the grooving action at each point of contact. This dynamic engagement, governed by the cam's geometric profile, ensures efficient material removal and groove formation in a single continuous pass, reducing the number of revolutions needed compared to static roller positioning systems.
4Ease of operation
If cam surfaces have regions of increasing radius, then ease of operation is improved, but manufacturing precision deteriorates due to difficulty in maintaining constant groove radius
Solution Approach 1:
The cam surface incorporates distinct zones with different geometric properties: an increasing radius region that facilitates easy engagement and operation, and a constant radius region that ensures precise and consistent groove formation. This local differentiation allows each portion of the cam to perform its specific function optimally, combining operational ease with manufacturing precision in different spatial locations on the same cam surface.
Solution Approach 2:
The cam surface is segmented into functional zones, including an increasing radius portion for smooth engagement and a constant radius portion for precise groove formation. This segmentation allows the cam to guide the roller through different stages of the grooving process with appropriate geometric characteristics for each stage, maintaining both ease of operation and groove radius consistency.
Data Source
AI summary
A device for cold working pipe elements has two or more cams, each having a gear which meshes with a pinion to turn all of the cams. Each cam has a cam surface with a region of increasing radius and may have a region of constant radius extending around a cam body. Each cam also has a traction surface extending around a cam body. A discontinuity in each cam surface is aligned with a gap in the traction surface of each cam. The discontinuities and gaps provide clearance for insertion and removal of the pipe element between the cams to form a circumferential groove when the cams are rotated. A cup adjacent the pinion is movable along the pinion axis to engage and disengage from a stop surface on one of the cams. Engagement between the cup and a stop surface prevents rotation of the cam.