Tapping Tool Lubrication and Thrust Bearing Mechanism
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Solution Overview
Problem
Existing tapping tools face challenges in efficiently threading holes in various materials and sizes, particularly due to issues with precision control of ram speed and potential damage from non-rotating ram contact, as well as inadequate lubrication delivery during the threading process.
Innovation Solution
A tapping tool designed for programmable auto-indexed punch presses, featuring a lubrication system that automatically delivers lubrication during each tapping cycle, adjustable core pins for accommodating different tap lengths, and compliance springs to manage varying thread pitches, while preventing damage from non-rotating ram contact through thrust bearing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a non-rotating ram contacts the tapping tool during operation, then the punching force can be effectively applied, but damage occurs to the tapping tool from the non-rotating ram contact
Solution Approach 1:
A thrust bearing element is introduced as an intermediary between the non-rotating ram and the rotating tapping tool. This thrust bearing element rotates with the tapping tool while supporting the axial load from the ram, preventing direct contact damage to the tool while maintaining effective force transmission during the punching operation.
2Manufacturing precision
If precise control of ram speed is implemented, then threading precision is improved, but the device complexity increases due to programmable control requirements
Solution Approach 1:
The system employs a programmable controller that dynamically adjusts the ram speed throughout the tapping cycle. The controller varies the speed profile based on the specific tapping parameters (tap size, thread pitch, material properties) to optimize both precision and efficiency, adapting the motion characteristics to each specific operation rather than using fixed speed control.
3Reliability
If lubrication is automatically delivered during each tapping cycle, then the reliability of the threading process is improved, but the device complexity increases due to the lubrication system components
Solution Approach 1:
The lubrication system is designed to deliver lubricant to the tapping tool at predetermined intervals and specific moments during the tapping cycle. The programmable controller activates the lubrication delivery mechanism in advance of the cutting action and controls the duration and amount of lubricant applied, ensuring reliable lubrication without requiring a continuously complex lubrication system.
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 tapping tool effectively threads holes across a range of materials and sizes with precision, minimizing damage and ensuring consistent lubrication, thus enhancing operational efficiency and versatility.
Implementation Method 1
compliance springs to accommodate varying thread pitches
Implementation Method 2
preventing damage from non-rotating ram contact through thrust bearing elements
Implementation Method 3
a lubrication system that automatically delivers lubrication during each tapping cycle
Data Source
AI summary
A tapping tool having a guide body, a driver for longitudinal movement of a tap within the guide body, and a pump for lubricating the tap. A keyway in the outer body of guide body mates with an indexing key in a rotatable indexing holder of a turret press, which causes the guide body to rotate in sync with the turret press. A driver cylinder is centrally disposed in the guide body. The driver is adapted for sliding, mating engagement within the driver cylinder. A chamber in the lubrication pump holds the lubrication which is ejected by the pump onto the tap. Lubrication is ejected onto the tap through a normally closed ejector inlet that is opened by downward movement of a plunge pin against the lubrication in the chamber. The ejector is sized to restrict the flow of lubrication from the ejector outlet, which creates back pressure in the lubrication chamber. The back pressure forces a ball to close the lubrication conduit when the plunge pin moves downward.