Eccentric Centering Element for Adjustable Tool Positioning
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Solution Overview
Problem
Existing centering elements for tool part elements in plastics processing tools require fixed positioning, which cannot be adjusted after initial setup, making subsequent position corrections impossible without modifying the tool part elements.
Innovation Solution
A centering element with an eccentrically offset centering body relative to the clamping body, allowing for adjustable positioning without altering the receiving recesses, utilizing a polygonal cross-section for secure alignment and allowing for relative displacements between tool part elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cylindrical or conical dowel pins are used for positioning tool part elements, then precise positioning is achieved, but subsequent position corrections require drilling new bores which is tedious and time-consuming
Solution Approach 1:
The centering element incorporates a movable centering body that can be adjusted axially relative to the clamping body. This allows the centering element to transition between a clamping state (when the centering body is retracted) and a centering state (when the centering body protrudes), enabling both secure connection and position adjustment without requiring new bores
Solution Approach 2:
The centering element is divided into two functional parts: a clamping body for securing the connection and a centering body for positioning. This segmentation allows each part to perform its specific function independently, with the centering body being adjustable while the clamping body maintains the connection
2Manufacturing precision
If centering elements with round partial bodies are used, then positioning is achieved, but the elements can slip too far into receiving recesses and require additional spring rings to prevent over-insertion
Solution Approach 1:
The collar function and the centering element body are merged into a single integrated component. The collar is formed as an integral part of the centering element, eliminating the need for separate spring rings or other additional components to prevent over-insertion
3Reliability
If polygonal cross-section centering elements are used, then anti-twist protection and secure alignment are achieved, but the structure becomes more complex
Solution Approach 1:
The centering element employs a polygonal cross-section (such as square or rectangular) instead of a round cross-section. This asymmetric shape provides inherent anti-twist protection and ensures correct orientation during assembly, while the complexity increase is minimal and confined to the cross-sectional geometry
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2
AI summary
The centering element (10) has a clamp portion (11) that is inserted into receiving recess of sub-elements. A conical centering portion (12) is engaged in another receiving recess of sub-elements and attached with clamp portion through collar (13). The clap portion and conical centering portion are provided with polygonal cross-section. The clamp portion is provided with housing (15). A central threaded bore (14) is provided at lower end of the clamp portion. Independent claims are included for the following: (1) centering element system for sub-elements of plastic processing tool; and (2) plastic processing tool.