MQL Tool Holder and Fixture Layout to Prevent Nozzle Interference
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Solution Overview
Problem
Existing minimum-quantity-lubrication milling equipment for aeronautical aluminum alloy workpieces faces issues with nozzle interference and contact with fixtures, leading to equipment damage and low compatibility with tooling and fixtures, which affects machining accuracy and efficiency.
Innovation Solution
The design incorporates a machine tool fixture with clamping elements that include a linear actuator and detection member to ensure accurate positioning, combined with a minimum-quantity-lubrication mechanism integrated with the tool holder, which mixes and atomizes cutting fluid and gas for concentrated spraying, avoiding nozzle interference and enhancing lubrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a minimum-quantity-lubrication mechanism is suspended on the side of the machine tool spindle, then cooling and lubrication can be provided to the machining region, but the nozzle is prone to interference and contact with the fixture, causing equipment damage
Solution Approach 1:
The minimum-quantity-lubrication mechanism is merged with the tool holder, forming an integrated structure. The atomizing nozzle is positioned at the front end of the tool holder, close to the cutting tool, eliminating the need for separate suspension on the spindle side. This integration ensures the nozzle remains clear of the fixture while maintaining effective lubrication delivery to the cutting zone.
Solution Approach 2:
The lubrication system transitions from a side-suspended configuration to a front-mounted configuration on the tool holder. This spatial repositioning moves the nozzle from the lateral dimension (where fixture interference occurs) to the axial dimension (front end of tool holder), eliminating interference while maintaining lubrication effectiveness.
2Manufacturing precision
If manual alignment procedures are used to position the workpiece, then the workpiece can be clamped for machining, but the locating accuracy is low and production efficiency is reduced
Solution Approach 1:
The fixture body is pre-provided with limit blocks at predetermined positions that automatically locate the workpiece before clamping. The workpiece is positioned against these limit blocks, which constrain its position in the machining direction. This preliminary positioning action eliminates the need for manual alignment procedures, ensuring consistent locating accuracy and reducing setup time.
Solution Approach 2:
The fixture body with integrated limit blocks provides self-positioning capability. When the workpiece is placed on the fixture, it automatically aligns itself against the limit blocks without requiring external alignment tools or manual adjustment by operators. This self-service positioning mechanism improves both accuracy and efficiency.
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 improves clamping reliability, machining accuracy, reduces labor intensity, and increases production efficiency by preventing nozzle interference, ensuring precise and efficient machining with thorough lubrication coverage.
Implementation Method 1
a small amount of cutting fluid and a gas with a certain pressure are mixed and atomized, and then sprayed to the cutting region for cooling and lubrication
Implementation Method 2
The cooling function of the cutting fluid is to take the cutting heat away from the cutting tool and the workpiece through the convection between the cutting fluid and the chips and workpiece
Implementation Method 3
the vaporization of the cutting fluid, thereby effectively reducing the cutting temperature
Implementation Method 4
a top of the clamping element is provided with a detection member for detecting a relative position between the clamping element and the spindle
Implementation Method 5
The clamping element includes a linear actuator arranged inside the fixture body; a telescopic part of the linear actuator is connected with a pressing block through a drive mechanism
Data Source
AI summary
An aeronautical aluminum alloy minimum-quantity-lubrication milling machining device includes a machine tool worktable and spindle connected with a machine tool power system. The spindle is connected with a tool holder that is fixed with a cutting tool. The machine tool worktable is provided with a machine tool fixture, the tool holder is connected with a minimum-quantity-lubrication mechanism, the machine tool fixture includes a fixture body that is fixedly provided with a limit block for contact with two adjacent side surfaces of a workpiece, the fixture body is provided with a plurality of clamping elements capable of pressing the workpiece against an upper surface of the fixture body, and a top of the clamping element is provided with a detection member for detecting a relative position between the clamping element and the spindle. The device can avoid interference and contact between a nozzle and the clamping element.