Helical Recess Rolling with Dynamic Axis Rotation
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Solution Overview
Problem
Existing methods for producing sintered metal blanks with helical internal recesses face challenges in maintaining a constant angle of inclination over the entire length, leading to inaccurate production and high wastage rates, especially in small batches or larger nominal diameters, due to the variability in path lengths covered by different sections of the blank during the rolling process.
Innovation Solution
A method involving a rolling process with a changing axis of rotation, where the blank is twisted in two successive steps, ensuring that each length section covers the same path, thereby maintaining a consistent angle of inclination for the helical recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rolling process with a fixed axis of rotation is used to produce helical internal recesses, then the production process is simple, but the angle of inclination of the helical recesses varies along the length of the blank
Solution Approach 1:
The patent applies the dynamics principle by changing the axis of rotation from a fixed position to a moving position along the blank length. The axis of rotation moves in synchronisation with the blank progression through the rolling process, ensuring that each cross-section experiences the same rotational path length. This dynamic adjustment maintains constant angle of inclination throughout the helical recess while keeping the rolling device structure relatively simple.
Solution Approach 2:
The patent implements feedback control by synchronising the axis of rotation movement with the blank progression speed. The system continuously monitors and adjusts the axis position to ensure that each cross-section of the blank covers the same path during rolling, thereby maintaining consistent helical recess geometry along the entire blank length.
2Loss of substance
If conventional extrusion methods are used for small batches or larger nominal diameters, then production flexibility is maintained, but wastage rate increases due to inaccurate helical recess production
Solution Approach 1:
The dynamic axis of rotation system enables accurate helical recess production across varying blank sizes and batch quantities. By adjusting the axis position according to the specific blank dimensions and required helix angle, the system maintains high precision regardless of production volume or nominal diameter, thereby reducing wastage from rejected parts while remaining economically viable for small batches.
3Manufacturing precision
If the axis of rotation is changed during the rolling process to maintain constant angle of inclination, then manufacturing precision is improved, but the complexity of the rolling device increases
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamically adjustable axis of rotation system. The axis position can be changed during the rolling process to accommodate different blank lengths and desired helix angles, while the overall device structure remains relatively simple through the use of programmable control mechanisms that automate the axis repositioning without requiring complex mechanical reconfiguration.
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
This approach ensures a highly consistent angle of inclination for the helical internal recesses over the entire length of the sintered metal blank, reducing wastage and the need for precise working accuracy during grinding and machining, and improving the economic viability of the production process.
Implementation Method 1
subjected, while being supported over its entire length on a support, to a rolling process by a friction surface arrangement
Data Source
AI summary
A method is for producing a circular cylindrical body (10) comprising a workable mass, having at least one helical internal cavity extending in the interior of the body. The body (10) is initially produced with a straight internal recess, for example by means of extrusion. Afterwards the body is cut to a defined length. The body (10) that has been cut to length is then subjected to a rolling process by means of a friction surface arrangement (23) while being supported over the entire length thereof on a support means (16). The rolling process takes place in multiple steps, wherein a rolling movement using a first axis of rotation (25) is performed in a first step, and a rolling movement using a second axis of rotation (26) that is different from the first axis of rotation is used in a second step. There is also an apparatus for performing the method.