Continuous Casting Shoe Layout for Lead Grid Filling Stability
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Solution Overview
Problem
Existing continuous casting machines for lead-acid battery grids face issues such as flashing, incomplete filling of mold grooves, and cold welded seams, leading to poor structural quality and reduced current carrying capacity, especially when operating at high speeds over extended periods.
Innovation Solution
A continuous casting machine with a shoe design featuring an orifice slot, supply and return slots, and optional return passage molten lead return tube, which controls molten lead flow and temperature to improve casting integrity and production rate, and a method for attaching electrically conductive carbon fiber material to a lead conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous casting is operated at high speed over extended periods, then production rate increases, but casting quality deteriorates due to flashing, incomplete filling, and cold welded seams
Solution Approach 1:
The patent modifies physical parameters of the casting system including shoe temperature, molten lead temperature, and pressure conditions to maintain casting quality at high production speeds. Specifically, the shoe is heated to controlled temperatures (e.g., 400-600°F) and molten lead is maintained at specific temperatures (e.g., 600-800°F) to prevent cold welding and ensure complete mold filling even during continuous high-speed operation
Solution Approach 2:
The patent applies preliminary heating to the shoe and molten lead before casting begins, and maintains these temperatures throughout operation. The shoe is pre-heated to eliminate thermal shock and ensure immediate proper casting conditions when production starts or resumes, preventing cold welded seams from the outset of high-speed operation
2Manufacturing precision
If shoe temperature is maintained within narrow ranges, then casting quality improves, but device complexity increases due to temperature control requirements
Solution Approach 1:
The patent designs the shoe with self-heating capabilities through internal heating elements that automatically maintain the required temperature range. The system includes temperature sensors and control mechanisms that autonomously regulate heating, reducing the need for complex external temperature control infrastructure while ensuring consistent casting quality
Solution Approach 2:
The patent utilizes thermal expansion principles in the design of the shoe and mold interfaces. By controlling temperature, the system manages dimensional stability of the shoe components, ensuring consistent clearance and fit with the rotating drum mold without requiring overly complex mechanical adjustment mechanisms
3Manufacturing precision
If molten lead is supplied at super atmospheric pressure, then filling of mold grooves improves, but flashing between drum grooves increases
Solution Approach 1:
The patent applies different pressure conditions to different regions of the casting system. The shoe orifice is designed to deliver molten lead at controlled pressure specifically where needed, while the interface between the shoe and rotating drum is designed with precise clearances to contain the molten lead. This localized pressure control ensures complete groove filling without excessive pressure causing flashing between adjacent grooves
Solution Approach 2:
The patent introduces the shoe as an intermediary component between the molten lead supply and the rotating drum mold. The shoe acts as a pressure-regulating interface that distributes molten lead evenly into the mold grooves, mediating between the high-pressure lead supply and the mold cavity to prevent flashing while ensuring complete filling
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 improved shoe design enhances the homogeneity of lug attachments, reduces cold welding, and increases production rates by up to 50%, while the carbon fiber electrodes provide a cost-effective solution for high-quality electrodes with improved structural strength and conductivity.
Implementation Method 1
The shoe typically has a generally axially extending orifice slot opening onto the mold cavity of the drum. Typically, excess molten lead is supplied at a super atmospheric pressure to the orifice slot to fill the portion of the mold of the drum rotating past the slot
Implementation Method 2
excess molten lead is supplied at a super atmospheric pressure to the orifice slot to fill the portion of the mold of the drum rotating past the slot to thereby continuously cast an elongated web or strip of connected successive battery grids
Data Source
AI summary
A shoe for dispensing a molten metal such as lead into a mold cavity of a rotating drum to continuously cast a web of a plurality of serially connected grids or battery composite electrodes of a carbon fiber material with a cast metal conductor. The shoe may have at least one elongate orifice slot in a face confronting the drum, a molten metal supply passage communicating with the orifice slot and an excess molten metal return slot opening into the confronting face downstream of the supply slot relative generally to the direction of rotation of the drum.