Profiled Tube Mandrel Segmentation for Compact Machining
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Solution Overview
Problem
Traditional methods for producing profiled tubes are limited by the length of the mandrel, which restricts the production of longer tubes due to higher production costs and machine dimensions, making it difficult to achieve precise profiling with minimal free play and high strength.
Innovation Solution
A method and device where a mandrel is introduced into a hollow cylindrical blank, with a clamping mechanism and secondary headstock allowing for compact machine design, enabling profiling of longer tubes by confining the mandrel's range of motion to the length of the region being worked, and using a lance for form-fitting connection and axial movement through a machining station for precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional mandrel is used for profiling tube blanks, then precise inner profiling can be achieved, but the mandrel length must exceed the blank length, increasing machine dimensions and production costs
Solution Approach 1:
The profiling process is segmented into two independent operations: inner profiling by a short mandrel and outer profiling by stationary machining tools. The mandrel only needs to cover the working region length, not the entire blank length, allowing segmentation of the profiling functions between mobile and stationary components.
Solution Approach 2:
The blank itself serves as an intermediary medium that transmits the profiling action from the short mandrel to the entire tube length. By clamping the blank and rotating it, the outer profiling tools can create the complete outer profile while the mandrel remains confined to the working region.
2Length of moving object
If the mandrel is made longer to accommodate longer tube blanks, then longer tubes can be produced, but production costs increase significantly
Solution Approach 1:
The profiling system is segmented into a mobile inner profiling unit (short mandrel) and a stationary outer profiling unit (machining tools). This allows production of longer tubes without proportionally increasing mandrel length or cost, as the expensive mandrel component remains short while the tube length is extended through the stationary outer profiling capability.
Solution Approach 2:
The system transitions from a static, long mandrel approach to a dynamic configuration where the short mandrel moves with the blank through the working region, while the outer profiling tools remain stationary. This dynamic arrangement reduces mandrel length requirements while maintaining the ability to profile longer tubes.
3Reliability
If the mandrel remains inserted within the entire blank length, then complete coverage is achieved, but the machine dimensions and complexity increase
Solution Approach 1:
The profiling function is segmented between a short mandrel for inner profiling and stationary external tools for outer profiling. The mandrel only needs to traverse the working region, not the entire blank length, reducing machine dimensions while maintaining complete profiling coverage through the coordinated action of both systems.
Solution Approach 2:
Instead of having the mandrel cover the entire blank length, the approach is inverted: the mandrel is shortened and the blank is rotated and fed through the working region, allowing the stationary outer tools to provide the extended coverage that would otherwise require a long mandrel.
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 production of longer, precisely profiled tubes with reduced machine dimensions, allowing for efficient loading and unloading of blanks and mandrels, achieving high precision and compactness while supporting the use of impact rolling for both inside and outside profiling.
Implementation Method 1
clamping the blank in the clamping mechanism to hold the blank
Implementation Method 2
the machining stage works radially on the surface of the blank from the outside, along a segment being worked, in order to create at least the inner profiling of the blank
Implementation Method 3
bringing the lance into a form-fitting connection with the clamping mechanism at least in regard to traction and rotation
Data Source
AI summary
A method and device are disclosed for producing tubes that are at least partially profiled on their interior and preferably on their exterior from a hollow cylindrical blank (3), using a mechanical cold forming method, wherein the end of the blank (3) that is not to be machined (3′) is fed to a clamping device (10). The blank (3) is then secured in the clamping device (10) and a mandrel (2) is subsequently inserted into the end of region (3) of the blank (3) that is to be machined. A lance (8) is guided in the mandrel so that it can be coaxially displaced in a longitudinal direction and the free end of the lance (8′) can be introduced into the clamping device (10). The tip (8′) of the lance (8) is then brought into a positive fit with the clamping device (10) in the axial direction of the blank (3) and the mandrel (2), together with the clamping device (10) and the blank (3) is guided axially through a fixed machining point (6). Radial exterior machining of the surface of the blank (3) along the section that is to be machined (3′) takes place at the machining point (6), to create the interior and exterior profiling of the blank (3). During the process, the mandrel (2) is preferably rotated about its axis in an intermittent manner.