Cam Grooving Mechanism for Precise Pipe Groove Cold Forming
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Solution Overview
Problem
Existing roll grooving machines face challenges in producing a circumferential groove in pipe elements with the required precision and tolerances, often requiring complex devices and significant operator involvement, with low production rates and many revolutions needed to achieve a finished groove.
Innovation Solution
A cam-based system with a cam body having a surface with regions of increasing and constant radius, and a traction surface with projections and gaps, is used to deform the pipe element, allowing for simultaneous engagement and rotation to form a groove with reduced operator involvement and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If roll grooving machines use multiple rollers with actuators to achieve precise groove radius, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the complex mechanical actuator and adjustment systems with a cam mechanism. The cam profile is designed to directly control the roller's radial movement, transforming the need for powered actuators and operator adjustments into a passive mechanical guidance system. This substitution maintains groove radius precision while dramatically simplifying the overall device structure.
Solution Approach 2:
The invention changes the control parameter from active actuator position control to passive cam profile geometry. By carefully designing the cam surface profile, the system achieves precise groove radius control through the geometric constraints of the cam mechanism rather than through active mechanical adjustment systems.
2Manufacturing precision
If roll grooving machines require operator adjustment to achieve desired groove radius, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The cam mechanism is designed to automatically control the groove formation process. The cam profile inherently guides the roller to achieve the desired groove radius without requiring operator intervention for adjustment. The system serves itself by using the cam's geometric properties to maintain precise control throughout the grooving operation.
3Manufacturing precision
If roll grooving machines require many revolutions to achieve finished groove, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The cam mechanism is designed to complete the groove formation process in a single rotational cycle. The cam profile is shaped to progressively form the groove during one complete rotation, eliminating the need for multiple revolutions. This periodic action maintains precision while dramatically increasing production rate by completing the operation in fewer cycles.
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 cam-based system enables precise and efficient cold working of pipe elements, achieving the desired groove radius within necessary tolerances in fewer revolutions, improving production rates and simplifying the process.
Implementation Method 1
cold working of pipe elements, for example, impressing a circumferential groove in a pipe element
Implementation Method 2
the outer roller is progressively forced toward the inner roller... thereby forming a circumferential groove
Implementation Method 3
a friction surface extends around the cam body. The friction surface comprises a plurality of projections extending transversely to the axis of rotation
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.