Movable Stop Piece Tool Holder for Leak-Free Fluid Transfer
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Solution Overview
Problem
Existing tool holders fail to reliably transfer fluids supplied via laterally offset lines to tools due to inadequate sealing and adaptation to the tool shank, leading to potential leakage and inefficiency, especially with imprecisely manufactured tool shanks.
Innovation Solution
A tool holder design featuring a movable stop piece with elastic or articulated connection, allowing fluid supply lines to adapt to the tool shank's contour, ensuring secure sealing and fluid transfer regardless of the tool's angular position, with closed channels and an annular groove for fluid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed stop part with rigid fluid supply lines is used, then the structure is simple and easy to manufacture, but the fluid transfer is unreliable due to inadequate sealing and adaptation to the tool shank
Solution Approach 1:
The stop piece is designed to be movable rather than fixed, allowing it to adapt dynamically to the tool shank's position and contour. This dynamic capability enables reliable fluid transfer despite variations in tool alignment, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The stop piece can change its position and orientation parameters to match the tool shank's actual configuration. This parameter adaptation allows the fluid supply lines to maintain proper alignment and sealing, achieving reliable fluid transfer without requiring a complex adjustable mechanism.
2Reliability
If the stop piece is made from a softer and more elastic material, then the sealing properties are improved and adaptability to the tool shank is enhanced, but the stop piece may perform unwanted axial movements
Solution Approach 1:
The stop assembly is segmented into the stop part (providing structural support and positioning) and the stop piece (providing sealing and adaptation). This segmentation allows the softer stop piece to improve sealing without compromising the overall positional stability provided by the rigid stop part.
Solution Approach 2:
The stop piece is made from softer, more elastic material specifically at the sealing interface where contact with the tool shank occurs. This local quality enhancement improves sealing reliability without requiring the entire stop assembly to be soft, thereby maintaining positional stability.
3Reliability
If fluid supply lines have abrupt expansions or non-closed channels, then the structure is simpler, but unintentional separation of working fluids or premature expansion occurs
Solution Approach 1:
The fluid supply lines are pre-designed as closed channels with uniform cross-sections before the tool is installed. This preliminary design prevents fluid separation and premature expansion by eliminating abrupt expansions, ensuring fluid integrity from the start.
Solution Approach 2:
The patent accepts the increased manufacturing complexity of closed channels with uniform cross-sections as a necessary investment to prevent fluid loss and maintain working fluid integrity throughout the tool's service life, rather than using simpler but less reliable open channels.
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 design ensures reliable, leak-free transfer of working fluids to the tool, maintaining fluid integrity and preventing premature expansion or evaporation, while avoiding the use of loose parts like coil springs, ensuring repeatable clamping and improved tool performance during machining.
Implementation Method 1
the stop piece that rests against the end of the shaft can move elastically or in an articulated manner within a certain framework and adapt to the contour of the end of the shaft
Implementation Method 2
the stop piece is movably mounted in the stop part by means of a ball and socket joint
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a tool holder (1) comprising a holder body (2) having a holder opening (5) for a tool shaft (4) of a tool (3), and an impact part (6) arranged in the holder opening (5) for contact with the front end of the tool shaft (4), wherein the tool holder (1) has at least one fluid feed (9), extending through the holder body (2) and through the impact part (6), for feeding an operating fluid to the tool (3). In order to achieve particularly good sealing with respect to the tool shaft, the impact part (6) has, at the front end (12) facing the tool shaft (4), a movable impact piece (13), through which the at least one fluid feed (9) extends.