Feed Clamping Saddle Drive Using Electromagnetic Linear Actuation
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Solution Overview
Problem
Existing cold pilger rolling mills face high wear and maintenance costs due to low transmission ratios in spindle drives, which limit slow displacement necessary for producing precise metal tubes of small diameters, leading to irregularities.
Innovation Solution
Implementing a direct electromechanical linear drive for the feed clamping saddle, which operates contactlessly and reduces mechanical components, allowing for precise and wear-free movement with reduced structural size and lower spare part costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low transmission ratio spindle drive is used for the feed clamping saddle, then positioning precision is improved, but wear increases leading to higher maintenance costs and reduced reliability
Solution Approach 1:
The patent replaces the mechanical spindle drive system with a magnetic field-based direct drive system. The synchronous motor generates a magnetic field that directly interacts with the magnetic strip on the feed clamping saddle, eliminating mechanical contact and wear while maintaining precise positioning control through electromagnetic field interaction.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the drive system and the feed clamping saddle. The magnetic strip attached to the saddle interacts with the magnetic field generated by the synchronous motor, enabling contactless force transmission and precise positioning without mechanical wear.
2Measurement precision
If a low transmission ratio spindle drive is used, then positioning precision is improved, but the system cannot achieve slow displacement needed for small diameter tubes
Solution Approach 1:
The patent employs a dynamic control system where the synchronous motor's magnetic field can be precisely controlled in real-time. This allows the feed clamping saddle to achieve both slow displacement for small diameter tubes and faster movement when needed, with the control system dynamically adjusting the magnetic field strength and position.
Solution Approach 2:
The patent changes the control parameters of the magnetic field generated by the synchronous motor. By adjusting current, voltage, and magnetic field strength, the system can achieve varying displacement speeds while maintaining precise positioning, enabling slow movement for small tubes and faster movement for larger diameters.
3Reliability
If a traditional spindle drive with mechanical components is used, then the structure is proven reliable, but device complexity and spare part costs increase
Solution Approach 1:
The patent extracts and removes the complex mechanical transmission components (spindle, nut, gears, belts) from the drive system. Only the essential synchronous motor and magnetic strip remain, significantly reducing the number of mechanical parts while maintaining reliable operation through contactless magnetic field interaction.
Solution Approach 2:
The synchronous motor with magnetic field control serves multiple functions: it provides both the driving force and precise positioning control, eliminates the need for separate transmission components, and enables both slow and fast displacement modes. This multi-functionality reduces overall system complexity while maintaining reliability.
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 direct electromechanical linear drive enables precise, slow, and wear-free movement of the feed clamping saddle, reducing maintenance costs and ensuring high positional accuracy and efficiency in producing metal tubes of various diameters.
Implementation Method 1
a magnetic strip (17) is attached to the feed clamping saddle (5) in a manner such that the magnetic field generated by the synchronous motor (6) acts on the magnetic strip (17) and thus generates a driving force on the feed clamping saddle (5)
Implementation Method 2
the magnetic field generated by the synchronous motor (6) acts on the magnetic strip (17) and thus generates a driving force on the feed clamping saddle (5)
Data Source
AI summary
The state of the art discloses cold rolling mills comprising a roll stand, at least one roll rotatably mounted to the roll stand, a feed clamping saddle for feeding a blank, and a first drive for the feed clamping saddle. Those cold rolling mills have ball spindle drives with a high rate of wear as the drive for the feed clamping saddle. In comparison the object of the present invention is to provide a cold rolling mill whose drive for the feed clamping saddle involves no or only very slight wear and which in addition permits a slow movement of the feed clamping saddle. According to the invention that object is attained by a cold rolling mill which has a direct electromechanical linear drive for the feed clamping saddle.