Laundry Drum Shell Embossing with Radial Pressure Blocks
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Solution Overview
Problem
Existing methods for introducing embossed structures into metallic laundry drum shells are complex, expensive, and prone to wear, leading to inconsistent and inaccurate embossing due to the need for precise roller matching and high accuracy in drum guidance, which limits the production of drums with deep or circumferentially long embossings and results in out-of-round drum shells.
Innovation Solution
A method involving radially movable pressure blocks that securely lock the drum shell in place, eliminating rotating components and using smaller, independently controlled embossing dies arranged around the circumference to introduce embossings in multiple steps, ensuring accurate and reproducible embossing without wear, allowing for different structures to be produced with a single set of tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rotating rollers with flexible jackets are used for embossing the drum shell, then embossing structures can be introduced, but the device becomes structurally complicated and expensive, and heavy wear occurs on the rollers
Solution Approach 1:
The drum shell is divided into multiple embossing zones, with multiple pressure rollers arranged circumferentially to apply embossing pressure to different segments simultaneously. Each roller is independently controllable, allowing precise embossing without requiring complex guidance for a single large roller.
Solution Approach 2:
Instead of rotating the drum shell between rollers as in conventional methods, the drum shell is rotated in place while stationary pressure rollers apply embossing pressure from the outside. This inverts the conventional approach where the tool rotates with the workpiece, eliminating the need for complex roller guidance systems.
2Productivity
If the drum shell is rotated between pressure roller and support roller, then embossing can be introduced, but wobbling movements occur which impair uniformity of embossing structures
Solution Approach 1:
The support roller with support elements is removed from the system. Instead of pressing the drum shell between a pressure roller and a support roller, only stationary pressure rollers apply embossing pressure from the outside while the drum shell rotates independently on its axis, eliminating wobbling movements.
3Length of stationary object
If large embossing rollers are used to cover the drum circumference, then circumferential embossing is possible, but the rollers suffer from severe abrasion and wear
Solution Approach 1:
The circumferential embossing is achieved by dividing the drum shell into multiple embossing zones, with multiple pressure rollers arranged circumferentially to apply embossing pressure to different segments simultaneously. Each roller has a smaller contact width, reducing abrasion while collectively covering the entire circumference.
4Manufacturing precision
If precise roller matching and high accuracy drum guidance are required, then embossing quality is maintained, but the device becomes expensive and less flexible for different drum sizes
Solution Approach 1:
The pressure rollers are designed with universally applicable features that allow them to be used with drum shells of different sizes. The rollers can be positioned at different circumferential locations and adjusted to accommodate various drum diameters, eliminating the need for size-specific roller sets while maintaining embossing quality.
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 method simplifies the embossing process, reduces tool wear, and enables high-quality, deep embossing with improved reproducibility and flexibility, allowing for various embossing structures to be produced without the need for multiple rollers or complex guidance systems.
Implementation Method 1
The compressive forces transmitted to securely hold the drum in the working position and to introduce the embossing are aligned radially from the outside to the middle of the drum and radially outwards from the middle of the drum
Data Source
AI summary
In a method for introducing an embossed structure into a metallic drum shell 1, in particular into a drum shell 1 of a laundry drum, in order to obtain reproducible precise embossed structures over the long term and a long service life of the tool parts with simple means, the embossing pressure that produces the embossed structure in the drum shell is between a the pressure block 4 having the embossing structure 3 and a support element 2 which is provided on the contact surface with a die having the counter-structure 5 . According to the invention, the cylindrically curved drum shell 1 is held in a fixed position during the embossing process. For this purpose, the drum shell 1 is successively processed by positioning, reliable locking and embossing, with the embossings 3 being made in the drum shell 1 in several work steps and the drum shell 1 being successively brought into the intended embossing positions by turning and/or by axial displacement.