Pipe Receiving Assembly With Cam Grooving and Flare Control
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Solution Overview
Problem
Existing roll grooving machines face challenges in accurately producing circumferential grooves in pipe elements with precise tolerances, often resulting in flare and requiring significant torque and operator involvement, which complicates the design and manufacture of mechanical couplings and seals.
Innovation Solution
A device comprising a pinion, carriage, cup, and cam bodies with specific surface profiles and a gear system that minimizes torque application and allows for precise control of groove formation, using cam surfaces and a die to form grooves with controlled flare, enabling faster and more accurate grooving with reduced operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If actuators are used to force rollers into engagement with the pipe element, then roller engagement can be achieved, but device complexity increases
Solution Approach 1:
The cam mechanism automatically forces the grooving die into engagement with the pipe element through its geometric profile during rotation, eliminating the need for external actuators and making the system self-actuating
Solution Approach 2:
The cam mechanism replaces complex actuator systems with a simpler geometric conversion of rotational motion into the required linear engagement force, reducing device complexity while maintaining operational ease
2Manufacturing precision
If significant torque is applied to the pipe element during grooving, then groove formation can be achieved, but production rate decreases
Solution Approach 1:
The grooving process uses periodic cam lobes that engage and disengage in a rhythmic sequence, allowing the pipe element to rotate through multiple cycles with controlled torque application, increasing production rate while maintaining groove formation quality
Solution Approach 2:
The cam mechanism dynamically adjusts the engagement force throughout the rotation cycle, applying maximum torque only when needed for groove formation and reducing torque during approach and retraction phases, optimizing both groove quality and production speed
3Manufacturing precision
If operator adjustment is required to achieve desired groove radius, then groove precision can be controlled, but ease of operation decreases
Solution Approach 1:
The cam mechanism incorporates pre-designed geometric parameters (lobe profiles, radii, angles) that automatically determine the groove radius and dimensions, eliminating the need for operator adjustment while maintaining precision through manufacturing accuracy of the cam itself
Data Source
AI summary
A pipe grooving device includes an assembly adapted to receive an end of the pipe. The assembly includes a cup which surrounds a pipe end stop. The cup and the pipe end stop may be mounted on a fixed pinion about which a carriage rotates. The carriage carries geared cams which engage the pinion and rotate synchronously when the carriage rotates relatively the pinion. The cams engage a pipe element received by the cup and form a circumferential groove in the pipe element. The cup and the pipe end stop move independently of one another axially along a pinion shaft to actuate rotation of the carriage. The cup accommodates dimensional pipe diameter tolerances and mitigates pipe flare and maintains pipe roundness during the grooving process.