Extrusion Press Floating Bearing for Uniform Pressing Force
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Solution Overview
Problem
Existing extrusion presses using electric motor drives face challenges in achieving uniform and precise force application for extrusion, leading to potential irregularities and reduced efficiency due to transverse forces and stress on the drive system.
Innovation Solution
Incorporating a bearing unit with play perpendicular to the force vector, such as a floating bearing or cardanic joint, to absorb transverse forces and ensure optimal drive output while minimizing stress on the electric motor drive, allowing for a more uniform and precise force effect during the extrusion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an electric motor drive is used to apply pressing forces in the extrusion press, then the device complexity is reduced compared to hydraulic drives, but the manufacturing precision and uniformity of force application deteriorate due to transverse forces and stress on the drive system
Solution Approach 1:
A bearing unit with play perpendicular to the force direction is introduced as an intermediary element between the electric motor drive and the extrusion punch. This bearing unit absorbs transverse forces and moments that arise during extrusion, preventing them from affecting the uniformity of force application. The bearing unit acts as a mediator that isolates the drive system from lateral loads while allowing the electric motor to apply precise pressing forces through the spindle-nut arrangement.
2Force
If a rigid connection is used between the electric motor drive and the extrusion punch, then the force transmission is more direct, but transverse forces impair the drive output and cause irregularities during extrusion
Solution Approach 1:
The bearing unit is designed with controlled play perpendicular to the force direction, transforming the rigid connection into a dynamically adaptive connection. This play allows the bearing unit to self-adjust and absorb transverse forces and moments that occur during the extrusion process, while maintaining direct force transmission in the extrusion direction. The dynamic characteristic of the bearing unit with its intentional clearance enables it to accommodate lateral loads without compromising the stability of the extrusion process.
3Measurement precision
If the electric motor drive directly acts on the extrusion punch without a bearing unit, then the force application is more precise, but the guide of the displaceable module becomes stressed and irregularities such as jumps or oscillations occur
Solution Approach 1:
The bearing unit with play perpendicular to the force direction converts the potentially harmful transverse forces and moments into beneficial load absorption. Instead of allowing these lateral loads to stress the guide and cause oscillations, the bearing unit's controlled clearance enables it to absorb these forces smoothly, preventing guide stress and extrusion irregularities while maintaining precise force application in the primary direction.
Data Source
AI summary
An extrusion press for extrusion of a material to be pressed through a die has a recipient that holds the material to be pressed, and a module that can be displaced relative to the die. The module can be acted on, during extrusion, by an electric motor drive, with the force required for extrusion. The electric motor drive is connected to the module that is displaceable relative to the die, by a bearing unit that has play perpendicular to the force; and/or during extrusion, drives contraction devices for contraction of a region of a tension element that stands under tension, which element counters the force required for extrusion by tension, and/or is a linear drive, which displaces a module that is fixed in place relative to the die during extrusion and the module that is displaceable relative to the die during extrusion, relative to one another, during extrusion.