Magnetic Die Ejector Plate Positioning to Reduce Wear
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Solution Overview
Problem
Existing die ejectors experience mechanical wear of web-shaped openings due to pin movement, leading to reduced service life, increased maintenance costs, and time losses as plates no longer reach their precise positions for die removal.
Innovation Solution
A die ejector design incorporating a magnet and spring system with stop members to ensure plates reliably reach their operating positions, using a camshaft and control cams to manage movement, and sensors for position verification, minimizing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pin moves through web-shaped openings to mechanically displace plates, then the plates can be moved between positions, but the web-shaped openings experience mechanical wear reducing service life
Solution Approach 1:
The patent replaces the mechanical pin-through-opening displacement system with a magnetic field-based system. Magnets are positioned to exert magnetic forces on ferromagnetic plates, causing them to move between retracted and extended positions without mechanical contact through wear-prone openings. This substitution eliminates the wear mechanism while maintaining the plate movement function.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the drive mechanism and the plates. Instead of direct mechanical contact between pins and plate openings, magnetic fields serve as the mediating force to transmit motion and control plate positioning, thereby eliminating mechanical wear at the interface.
2Manufacturing precision
If plates are mechanically worn by pin movement, then positioning precision degrades over time, but regular replacement increases maintenance time and costs
Solution Approach 1:
By replacing the mechanical pin-and-opening system with a magnetic field-based actuation system, the patent eliminates the wear that causes positioning precision degradation. The magnets exert force on the plates without physical contact through openings, preventing wear accumulation and maintaining consistent positioning precision throughout the device lifecycle, thereby reducing maintenance frequency and time.
3Measurement precision
If web-shaped openings are gradually worn by pin movement, then plates no longer reach their originally determined positions, but increased maintenance costs arise from regular plate replacement
Solution Approach 1:
The patent substitutes the wear-prone mechanical pin-through-opening system with a magnetic field-based system that maintains position accuracy without degradation. The magnets control plate positions through magnetic attraction/repulsion forces, eliminating the progressive wear that causes position drift, thereby maintaining measurement precision while reducing maintenance costs.
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 solution extends the operational life of die ejector plates by ensuring precise positioning and reduced wear, enhancing the reliability and efficiency of die removal processes while minimizing maintenance.
Implementation Method 1
a magnet (20) which interacts with anchor sections (74) of the plates (56) and exerts on the plates (54) an attraction force (F')
Implementation Method 2
a spring system, respectively, which interacts with anchor sections (74) of the plates (56) and exerts on the plates (54) an attraction force (F′) or an impact force
Data Source
AI summary
A die ejector (2) comprising a chamber (4) with a cover plate (40) having a passageway, a plurality of plates (56) arranged inside the chamber (4) and reciprocally moveable between an initial position (58) and an operating position (60), respectively, the plates (56) intended to interact with a die carrier to support the removal of dies from the carrier, and a drive member (100) for moving the plates (56) between the operating position and the initial position.