Portable Die Cavity Modifying Machine for Slug Retention Grooves
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Solution Overview
Problem
Existing machines for modifying die cavities to prevent slug or blank pulling during stamping operations are inefficient and noisy, with a need for improved methods to quickly and accurately form slug retention grooves while minimizing vibration-induced noise.
Innovation Solution
A machine with an adjustable and vibration-dampened machining head that forms elongate slug retention grooves in the die cavity sidewall, using a rotary cutting or grinding bit, and includes a vibration dampening arrangement to isolate noise, allowing for precise groove depth control through an imaging system and adjustable machining head stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a portable die cavity modifying machine is used to machine slug retention grooves, then the machine can prevent blank or slug pulling during stamping, but the machining head contact with travel stops produces excessive vibration noise that masks the audible feedback needed for precise groove depth control
Solution Approach 1:
The patent applies beforehand cushioning by placing a vibration dampening arrangement (such as a rubber bumper or elastomeric material) between the machining head and the travel stop. This cushioning element absorbs and dampens the vibration and noise generated when the machining head contacts the travel stop, preventing the harmful vibrations from propagating through the machine structure and masking the audible feedback needed for precise groove depth control.
2Manufacturing precision
If the machining head travels the maximum range to ensure complete groove formation, then groove depth accuracy is improved, but the machining time and cycle time increase reducing productivity
Solution Approach 1:
The patent applies feedback by utilizing the audible sound generated during machining as a real-time indicator of groove depth achievement. The operator listens for the characteristic sound that occurs when the rotary cutting bit engages the die cavity sidewall and continues machining until the desired audible feedback confirms adequate groove depth. This auditory feedback mechanism eliminates the need for excessive travel range while ensuring sufficient groove formation, thereby maintaining precision without sacrificing productivity.
3Strength
If the machine is designed for use with thicker dies, then structural strength is sufficient, but the machine cannot effectively machine thinner dies which are increasingly used to improve stamping efficiency
Solution Approach 1:
The patent applies dynamics by making the machining head position adjustable along the travel path. The machining head can be positioned at different locations corresponding to different die thicknesses, allowing the same machine structure to adapt to both thin and thick dies. This dynamic positioning capability, combined with the vibration dampening arrangement that protects against damage during travel, enables the machine to effectively machine thinner dies while maintaining the structural strength needed for thicker applications.
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 machine efficiently forms slug retention grooves with improved accuracy and reduced noise, enabling uniform groove depth and increased production rate, while being suitable for use with thinner dies and previously challenging materials.
Implementation Method 1
A vibration dampening arrangement is provided that absorbs and dampens, reduces, or otherwise isolates vibration caused by rotating bit contact with the cavity sidewall
Data Source
AI summary
A portable and transportable die cavity modifying machine having a base carrying a carriage adjustable along one axis, e.g., a generally horizontal axis, and a machining head adjustable along another axis, e.g., a generally vertical axis, for modifying a die cavity of a stamping die in a manner that prevents blank or slug pulling during stamping press operation. The machine includes a stop that is adjustably connected to the carriage. The stop is configured to limit movement of the machining head along the generally vertical axis. The machine may also feature a vibration isolator that is used with the stop to prevent noise and vibration that result from movement of the machining head in relation to the stop. Additionally, the machine may include an optical device capable of capturing an image of the die cavity defining sidewall as the rotary grinding bit machines the elongate slug retention groove.