Machine Tool Connection Arrangement with Pre-stress Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Machine tools with bottom drives, such as presses, experience wear and noise issues due to load changes during alternating strokes, affecting the durability of force-transmitting elements and leading to increased stress on components.
Innovation Solution
A connection arrangement with a compensation element and pre-stressing unit that generates a force corresponding to the weight of the plunger, independently of the drive force, to pre-stress the thread connection and dampen cutting impacts, thereby reducing load changes and stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a detachable connection arrangement with thread and nut is used to connect the tie rod to the plunger, then the ease of assembly and disassembly is improved, but the durability and noise behavior deteriorate due to load changes during alternating strokes
Solution Approach 1:
The patent applies preliminary action by pre-stressing the thread connection before load changes occur. The pre-stressing unit continuously applies a pressing force to the thread connection between the tie rod and plunger, ensuring that the thread flanks remain in constant contact. This preliminary stress state prevents the thread from experiencing harmful load reversals and reduces impact shocks during alternating strokes, thereby improving durability while maintaining the detachable connection design.
2Ease of repair
If the connection arrangement allows for detachable connection of tie rods to the plunger, then the ease of repair is improved, but the noise generated during operation increases due to load changes
Solution Approach 1:
The pre-stressing unit applies continuous preliminary stress to the thread connection, maintaining constant contact between thread flanks during operation. This eliminates the impact shocks and sudden load reversals that cause noise in detachable connections, while preserving the ease of repair advantage through the removable tie rod design.
3Adaptability or versatility
If the thread connection is subjected to alternating loads during machining and idle strokes, then the adaptability to different operational states is improved, but the stress and wear on thread flanks increases
Solution Approach 1:
The pre-stressing unit continuously applies a pressing force to the thread connection, creating a preliminary stress state that counteracts the alternating loads during machining and idle strokes. This ensures that the thread flanks remain in constant contact and experience reduced stress variations, while the connection remains adaptable to different operational states.
Solution Approach 2:
The patent changes the stress state parameter of the thread connection by introducing continuous pre-stressing. This transforms the alternating load condition into a reduced stress condition, where the thread connection experiences minimal stress variations despite changes in operational state, thereby improving strength while maintaining adaptability.
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 solution increases the durability of force-transmitting elements, reduces noise, and minimizes the negative impact of load changes on machine components, ensuring a longer service life and improved operational stability.
Implementation Method 1
A force is produced via the compensation element or a unit corresponding to a weight of the stroke element, the force being initiated independently from a drive force for the stroke element
Implementation Method 2
generate a pre-stress, a (cutting) impact dampening and a compensation of the weight of the stroke element in the connection arrangement
Implementation Method 3
generate a pre-stress, a (cutting) impact dampening and a compensation of the weight of the stroke element in the connection arrangement
Data Source
AI summary
A method for operating a machine tool/work machine includes providing a machine tool/work tool including a stroke element, a connection arrangement including a traction/pressure element and at least one traction/pressure point, a detachable connection including a connection element, a compensation element or a unit which generate a pre-stress, a (cutting) impact dampening, and compensates for a weight of the stroke element in the connection arrangement. The drive device acts on a work piece to be machined via the connection arrangement with the traction/pressure element and the at least one traction/pressure point via the stroke element. A force is produced via the compensation element or a unit corresponding to a weight of the traction/pressure element, the force being initiated independently from a drive force for the stroke element, to generate a pre-stress, a (cutting) impact dampening and a compensation of the weight of the stroke element in the connection arrangement.