Cam Grooving Machine Stop Surfaces for Precise Pipe Groove 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 efficiency, often requiring complex devices and significant operator involvement, with low production rates and difficulties in achieving the desired groove radius.
Innovation Solution
A device comprising a housing with rotatable gears and cam bodies, featuring cam surfaces with regions of increasing and constant radii, traction surfaces, and stop surfaces, which allows for precise engagement and rotation of the cam bodies to form a circumferential groove with reduced operator intervention and increased production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If roll grooving machines are used to cold work pipe elements, then circumferential grooves can be formed, but the production rate is low and many revolutions are required to achieve a finished groove
Solution Approach 1:
The cam mechanism converts continuous rotation into periodic reciprocating motion, where the cam surface engages the pipe element during specific portions of the rotation cycle. This periodic engagement allows the groove to be formed in fewer revolutions compared to continuous rolling, thereby increasing production rate and reducing cycle time.
Solution Approach 2:
The invention uses a cam mechanism that dynamically adjusts the engagement between the grooving tool and the pipe element. The cam surface profile varies the contact pressure and engagement depth during rotation, enabling rapid groove formation with controlled deformation, thus improving productivity while maintaining quality.
2Manufacturing precision
If actuators and adjustable roller travel are used to achieve desired groove radius, then precision can be improved, but device complexity increases
Solution Approach 1:
The cam mechanism is designed with a fixed cam surface profile that automatically provides the correct groove radius through its geometric design. The cam surface itself acts as the precision element, eliminating the need for additional actuators or adjustable mechanisms. The pipe element is passively formed by the cam's inherent geometry, achieving precision without complexity.
Solution Approach 2:
The groove radius precision is achieved by carefully designing the cam surface profile parameters (radius, curvature, engagement angle) rather than using adjustable mechanisms. The cam geometry is optimized to produce the desired groove dimensions directly, converting a control problem into a design problem that eliminates complex actuation systems.
3Manufacturing precision
If operators are involved to adjust roller travel, then groove precision can be achieved, but operator involvement increases
Solution Approach 1:
The cam mechanism is a self-contained precision system where the cam surface profile inherently provides the correct groove radius. No operator adjustment is needed as the cam geometry automatically ensures consistent groove dimensions across all operations, eliminating the need for skilled operator intervention and simplifying operation.
Solution Approach 2:
The precision requirements are built into the cam surface design during manufacturing. The cam profile is pre-calculated and machined to provide the exact groove dimensions needed, so that when the machine operates, the precision is automatically achieved without requiring operators to make adjustments during operation.
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 device enables the cold working of pipe elements with improved precision and speed, achieving the desired groove radius within tight tolerances while minimizing operator involvement and enhancing production rates.
Implementation Method 1
cold working of pipe elements, for example, impressing a circumferential groove in a pipe element
Implementation Method 2
A traction surface extends around one of the cam bodies. The traction surface comprises a plurality of projections extending outwardly from the one cam body
Data Source
AI summary
A device for cold working pipe elements has two or more cams, each having a gear, the gears being synchronized 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. One or more cams may also have 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. An engagement body is mounted between the cams to engage and disengage from a stop surface on one of the cams. Engagement between the engagement body and a stop surface prevents rotation of the cams.