Prestressed Sliding Guide for Machine Tool Carriage
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Solution Overview
Problem
The positioning of elements with sliding support surfaces in machine tools is complex and does not ensure exact guidance between carriage elements in the long term, leading to instability and imprecision.
Innovation Solution
The solution involves form-fitting sliding blocks with prestressed sliding support surfaces, where the sliding blocks are oversized to fit within support wings, generating a prestressing force through material deformation, ensuring precise and permanent guidance by utilizing the elasticity of the support wings and an amorphous carbon layer for improved slidability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional positioning elements with sliding support surfaces are used, then the structure can be assembled, but the positioning is complex and does not ensure exact guidance in the long term
Solution Approach 1:
The sliding blocks are designed with an oversized cross-section that exceeds the receptacle dimensions. This parameter change (from exact fit to oversized fit) enables the generation of prestressing forces when the blocks are forced into the receptacles, transforming a simple positioning element into an active guidance system that maintains precise alignment through elastic deformation of the support wings.
Solution Approach 2:
The sliding blocks are pre-formed with oversized dimensions before assembly. This preliminary action ensures that when the blocks are inserted into the receptacles, they automatically generate the necessary prestressing forces without requiring additional adjustment mechanisms or complex positioning procedures during assembly.
2Stability of the object's composition
If sliding blocks are securely fixed on support wings, then long-term stability is achieved, but the guidance precision between carriage elements deteriorates
Solution Approach 1:
The support wings are designed with elastic properties that allow them to deform dynamically under the prestressing forces generated by the oversized sliding blocks. This dynamic capability enables the system to maintain both secure fixation and precise guidance, as the elastic deformation absorbs positioning tolerances while the prestressing forces continuously enforce accurate alignment between the first and second carriage elements.
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
This configuration provides stable and precise guidance of the second carriage element relative to the first carriage element, enhancing the long-term accuracy and reliability of the machine tool's movement.
Implementation Method 1
the prestressing is caused by the material elasticity of the supporting wings, ie the material of the supporting wings has sufficient elasticity to generate the prestressing
Implementation Method 2
the sliding blocks are provided with an amorphous carbon layer, which improves the sliding properties thereof
Data Source
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AI summary
The invention relates to a machine-tool for machining a workpiece by means of a relative movement between the workpiece and at least one tool. Said machine-tool comprises a carrier arranged on a machine frame and provided with a first receiving element, and a compound rest system arranged on the machine frame and provided with a second receiving element, said elements being mobile in relation to each other by means of the compound rest system. The compound rest system comprises a first carriage element supported on the machine frame and at least one guiding element comprises sliding guide surfaces. The compound rest system comprises a second carriage element that is guided on the sliding guide surfaces, with sliding support surfaces, in a supported manner, and carries the second receiving element. Said machine-tool also comprises a drive device for moving and fixing the second carriage element in relation to the first carriage element. The aim of the invention is to improve said machine-tool in terms of the quality of the guiding. To this end, the second carriage element comprises a base body and supporting wings extending therefrom, said wings comprising form-fitting receiving elements for the sliding blocks carrying the sliding support surfaces. Furthermore, the base body and the supporting wings hold all of the sliding support surfaces in relation to the guide surfaces in a pre-stressed manner.