Radially Displaceable Inner Mandrel for Pipe Bead Formation
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Solution Overview
Problem
Existing devices for introducing bead-like indentations into pipe walls are limited in their ability to produce indentations from the inside of the pipe and lack precision in contour dimensional accuracy.
Innovation Solution
The device features a radially displaceable inner burnishing mandrel and support roller, enabled by conical guide surfaces and compression springs, allowing for precise positioning and operation from both the inside and outside of the pipe to create bead-like indentations with high dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inner burnishing mandrel is fixed in position, then the device structure is simple, but the indentation cannot be actively designed from the inside of the pipe and dimensional accuracy is poor
Solution Approach 1:
The inner burnishing mandrel is made radially displaceable through a holding device with conical sliding surfaces that interact with the guide head. This dynamic positioning capability allows the mandrel to be actively displaced from the inside of the pipe to create bead-like indentations with high dimensional accuracy, while the conical guide surfaces provide stable and play-free positioning throughout the displacement range
Solution Approach 2:
The device is divided into functionally independent components: the guide head with conical guide surfaces, the holding device for the inner burnishing mandrel with its own conical sliding surface, and the support roller holding device. This segmentation allows each component to be optimized independently while working together to achieve precise radial positioning and active indentation design from the inside of the pipe
2Productivity
If the support roller is fixed relative to the pipe, then the device structure is simpler, but the rolling process for introducing beads is more complex and less efficient
Solution Approach 1:
The support roller is made radially displaceable through a holding device with conical sliding surfaces that interact with the guide head. This dynamic positioning enables the support roller to roll on the outside of the pipe wall while maintaining precise contact, simplifying the bead introduction process through an efficient rolling mechanism
Solution Approach 2:
The guide head with its conical guide surfaces serves multiple functions: it guides the radial displacement of both the inner burnishing mandrel and the support roller, provides stable positioning through the conical sliding surfaces, and enables coordinated movement of both components. This multi-functionality simplifies the overall device structure while achieving high productivity
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
Enables the active design of bead-like indentations from the inside or outside of the pipe, ensuring high precision and accuracy in contour formation, simplifying the introduction of both inner and outer beads through a rolling process.
Implementation Method 1
a first compression spring is provided for radial positioning of the holding device for the internal burnishing mandrel with its conical sliding surface against the first conical guide surface of the sleeve-shaped wall of the guide head. The first compression spring advantageously serves to prestress and thus to position the holding device for the inner roller burnishing mandrel against the guide head in a stable and in particular play-free manner.
Implementation Method 2
the holding device having a conical sliding surface on its radial outside for sliding along the first conical guide surface of the sleeve-shaped wall of the guide head
Data Source
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AI summary
The invention relates to a device (100) for introducing a bead-like formation into a wall region of a tube. In particular, the device comprises a drive shaft (120) for rotationally driving a tool head (150), on which a supporting roller (162) and a freely rotatably mounted inner rolling pin (170) are held. Provided concentrically in relation to the drive shaft is a cup-shaped guiding head (140) with a sleeve-shaped wall. To allow the formations to be formed even from the inside of the tube, according to the invention a first conical guiding surface along which the retaining device (180) slides is provided on the inner side of the sleeve-shaped wall (142) in a first angular region at the circumference, whereby the inner rolling pin (170) can be moved radially, in order to stamp the desired bead-like formation into the wall of the tube.