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Multiple casting apparatus and method

a technology of multiple casting and casting apparatus, applied in the direction of electrical equipment, cell electrodes, cell components, etc., can solve the problems of unfinished surface, parts to be rejected, battery parts that are not suitable for use, etc., and achieve the effect of avoiding localized surface penetration

Inactive Publication Date: 2005-07-21
WATER GREMLIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The process effectively inhibits the formation of cracks and tears in battery parts, achieving a finished surface without cold forming, and ensures the battery parts are ready for use with minimal surface irregularities and voids.

Problems solved by technology

Unfortunately, air bubbles within the battery parts cause the battery parts to be rejects as the air bubbles can produce large voids in the battery part.
In order to minimize the air bubbles in the battery part, a vacuum can be drawn in the battery part cavity mold; however, although the vacuum removes air from the mold and inhibits the forming of air bubbles in the battery part, the battery parts cast with a vacuum in the battery part cavity oftentimes solidify in an uneven manner producing battery parts with cracks or tears which make the battery parts unacceptable for use.
That is, in die casting the runner that supplies lead to the mold is usually broken off when the battery part is removed from the mold thus leaving an unfinished surface.

Method used

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  • Multiple casting apparatus and method
  • Multiple casting apparatus and method

Examples

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Embodiment Construction

[0021]FIG. 1 is a partial sectional view of apparatus 10 for face intensification during die casting of battery parts. Apparatus 10 includes an upper first mold part 11 and a lower second mold part 12 that are held proximate each other by a member (not shown) to form a cavity 16 therein. The two parts are joined a parting surface 12p that extends between the two mold parts.

[0022] Located partially in mold part 11 is a first extendible cylindrical piston 14 which is axially slideable into mold part 11. Piston 14 includes a cylindrical surface 14a for slideingly engaging cylindrical surface 11a in mold part 11 to prevent molten lead from flowing therepast. The end of piston 14 includes a hemispherical recess 14c and an annular impact surface 12e there around with the annular impact surface 12e located in a single plane. Extendible piston 14 slidingly engages the sidewall 11a of mold part 11 to allow for axial insertion thereof to bring the impact surface 12e downward to become a port...

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Abstract

An apparatus and method for pressure casting a battery part wherein an extendible piston includes sidewalls for shutting off the supply of molten lead and an impact surface that extends in a side-to-side condition to form an end surface of a battery part cavity so that when the extendible piston is brought into an intensifying condition the extendible piston shuts off further supply of molten metal while a heat source maintains the lead in a molten state as the impact surface of the piston forms a side-to-side mold cavity surface to complete the mold cavity surface thereby eliminating unevenness in the surface of the finished battery part by generating a force with the extendible piston which is sufficient to form a battery part so that upon removal from the mold the batter part is substantially free of tears and cracks as well as surface irregularities.

Description

FIELD OF THE INVENTION [0001] This invention relates generally to pressure casting and, more specifically to die casting of lead or lead alloy battery parts such as battery terminals to form a finished battery part while at the same time inhibiting the formation of cracks and tears during and after the solidification of the battery part through peripherally contracting the mold cavity volume by bringing an entire mold face toward a mold cavity to reduce the bounded surface volume of the mold cavity without disrupting the integrity of the faces of the mold part solidifying within the bounded surface volume. CROSS REFERENCE TO RELATED APPLICATIONS [0002] None STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0003] None REFERENCE TO A MICROFICHE APPENDIX [0004] None BACKGROUND OF THE INVENTION [0005] Battery parts such as battery terminals, which are typically made of lead or a lead alloy, are usually cold formed in order to produce a battery terminal that is free of voi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22D18/02B22D25/04
CPCB22D18/02H01M4/00B22D17/00B22D25/04B22D17/20B22D17/007
Inventor RATTE, ROBERT W.
Owner WATER GREMLIN
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