Tool Slide Offset Compensation via Self-Centering Guide

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Solution Overview

Problem

Conventional wedge drives in metalworking tools experience high wear and short service life due to their structural design, leading to unacceptable tolerances and increased tool wear, especially when screws are subjected to tensile forces and the slide element is constrained, preventing lateral expansion.

Innovation Solution

The implementation of an adjustable slide guide system with L-shaped sliding strips and a prismatic guide bar that allows for adjustment of the guide play by moving the sliding elements along a wedge-shaped surface, enabling self-centering and compensation of production-related offsets, thus reducing wear and maintaining stability across temperature changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the slide element is constrained by angle bars and screws to maintain guidance, then the structural stability is improved, but the slide element cannot expand laterally when heated and the running clearance is impaired, leading to increased tool wear

Engineering Contradiction:
Improvestructural stabilityVSAvoidtool wear
Core Design Contradiction:
Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent removes the angle bars and retaining screws from the guidance system. Instead, the slide element is guided directly by the prismatic guide surfaces formed by the driver element and slide guide element. This extraction of unnecessary components eliminates the constraint that prevented thermal expansion and impaired running clearance, thereby reducing tool wear while maintaining guidance functionality.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the guidance mechanism from a constrained screw-and-angle-bar system to a prismatic surface system that allows for thermal expansion. The prismatic guide surfaces are designed with appropriate clearance and geometry to accommodate temperature-induced dimensional changes while maintaining stable guidance, thus reducing harmful thermal effects on tool wear.

Inventive Principle:
Principle #35Parameter changes

2Manufacturing precision

If the slide element is held together by angle bars and screws to guarantee running play, then the guidance precision is improved, but all tensile forces are introduced into the screws, impairing the running clearance when heated and leading to poorer stability

Engineering Contradiction:
Improveguidance precisionVSAvoidstability
Core Design Contradiction:
Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The patent eliminates the angle bars and retaining screws that were causing the problem. The guidance precision is maintained through precisely machined prismatic guide surfaces between the driver element and slide guide element, which directly guide the slide element without introducing tensile forces into fastening components. This removes the source of instability while preserving guidance accuracy.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical fastening system (screws and angle bars) with a friction-based guidance system using prismatic surfaces. The guidance function is achieved through the geometric shape and contact surfaces of the driver and slide guide elements, eliminating the need for screws that introduce tensile forces and compromise stability under thermal loading.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If conventional wedge drives are used with short service life due to high wear, then the initial cost is reduced, but the tolerances become unacceptable and metalworking precision deteriorates

Engineering Contradiction:
Improveinitial costVSAvoidmetalworking tolerance
Core Design Contradiction:
Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent incorporates a self-centering mechanism through the prismatic guide surfaces that automatically compensate for production-related offsets and wear. This preliminary design feature ensures that even as the components wear over time, the guidance remains accurate, maintaining metalworking tolerances throughout the extended service life without requiring frequent replacements or adjustments.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent changes the guidance geometry to prismatic surfaces with specific clearance parameters that accommodate wear while maintaining precision. The self-centering capability is achieved through the geometric design of the prismatic guides, which automatically adjust for offset and wear, ensuring consistent metalworking tolerances over an extended service life compared to conventional designs.

Inventive Principle:
Principle #35Parameter changes

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 solution provides a compact, stable, and adjustable guidance system that minimizes tolerances and ensures precise alignment, extending the service life of the tool slide while maintaining stability and accuracy even when heated.

Implementation Method 1

a wedge surface (18) is formed on the driver (4), wherein a self-centering guide is formed between the slide body (3) and the driver (4), which centers the slide body (3) on the driver (4) when the slide body (3) is placed on the driver (4)

Methodology Applied
Scientific EffectWedge: Wedge

Data Source

PatentEP3238848B1Method for compensating for a production-induced offset in a tool slide
Publication Date: 2019.02.06 VOESTALPINE CAMTEC GMBH
  • EP3238848B1 patent drawingFigure 1
  • EP3238848B1 patent drawingFigure 2~5
  • EP3238848B1 patent drawingFigure 6~8

AI summary

The invention relates to a method for compensating for a manufacturing-related offset in a tool slide, wherein the tool slide comprises a slide bed (2), a slide body (3) and a driver (4), wherein a self-centering guide is formed between the slide body (3) and the driver (4), which, when the slide body (2) is placed on the driver (4), centers the slide body (3) on the driver (4) transversely to an x-axis (13) and the slide body (3) is mounted on the slide bed (2) via a flat guide transversely to the x-axis in such a way that the manufacturing-related offset is compensated in the transverse direction when the slide body (3) is centered on the driver (4), wherein, after the manufacturing-related offset has been compensated, sliding elements (8) between the slide bed (2) and the slide body (3) are moved and adjusted in such a way thatthat the sliding surfaces bear in a form-fitting manner against a web (15) projecting into a groove (5) according to the x-axis (13), thus eliminating the floating bearing perpendicular to the x-axis (13).