Worm Gear Chuck for Ball Race Milling Cutters
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Solution Overview
Problem
Existing chucks for ball milling cutters face a challenge in achieving mechanical stability while maintaining short changeover times, as they are often time-consuming to secure, posing a conflict between stability and quick retooling.
Innovation Solution
A chuck design featuring a worm gear with a sleeve that is axially movable via a rotational movement, utilizing separate internal and external threads for clamping, and an optional stop to prevent over-insertion, ensuring a mechanically stable connection without relying on few threads, and incorporating features like a hexagon socket and HSK interface for secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional chuck design is used to clamp ball milling cutters, then mechanical stability can be achieved, but changeover times become excessively long
Solution Approach 1:
The chuck is divided into functionally independent components: a body with a through-hole for tool insertion, a separate clamping mechanism with jaw elements, and a worm gear actuation system. This segmentation allows the tool to be quickly positioned in the through-hole while the clamping mechanism independently secures it, enabling rapid changeover without compromising clamping stability.
Solution Approach 2:
The through-hole in the chuck body is pre-configured to receive the ball milling cutter shaft, allowing the tool to be preliminarily positioned and aligned before final clamping. This preliminary action reduces the time required for alignment and insertion during tool changes while maintaining secure mechanical engagement.
2Strength
If the ball milling cutter is screwed deep into the sleeve to ensure stability, then mechanical connection strength is improved, but the risk of jamming increases
Solution Approach 1:
A sleeve element acts as an intermediary between the ball milling cutter shaft and the chuck body. The sleeve receives the shaft via threading and provides a controlled engagement depth, mediating the connection to ensure sufficient thread engagement for mechanical strength while preventing excessive insertion that could cause jamming of the clamping mechanism.
Solution Approach 2:
The sleeve design incorporates predetermined thread engagement characteristics that cushion the connection process. The threading geometry and sleeve length are designed to automatically limit engagement depth, providing a built-in protective mechanism that prevents over-insertion and potential jamming before it can occur during operation.
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 design allows for a mechanically stable clamping of ball milling cutters with reduced changeover times, preventing jamming and ensuring secure engagement without relying on a few threads, thus enhancing production efficiency and safety.
Implementation Method 1
a worm gear with a worm wheel and a worm, the chuck comprising a sleeve with a first internal thread, the sleeve being axially movable by a rotational movement of the worm wheel
Implementation Method 2
a connection between the sleeve and the worm gear takes place via an external thread/internal thread connection, as a result of which an axial displacement of the sleeve can be achieved in a simple constructive manner by a rotational movement of the worm wheel
Data Source
Figure 1
AI summary
The description includes a chuck for clamping a ball track milling cutter comprising: a worm gear with a worm wheel 111 and a worm 113, wherein the chuck includes a sleeve 103 with a first internal thread 118, wherein the sleeve 103 is axially movable by a rotational movement of the worm wheel 111, wherein a first external thread 105 of the ball track milling cutter is arranged to engage in the first internal thread 118.