Process for casting a plate grid for a lead-acid storage battery

A casting die assembly for casting a plate grid for a lead-acid storage battery comprising two interengagable die halves having complementary casting cavity forming grooves;

• and an ingate to introduce a molten metal of lead or lead alloy into a casting cavity formed between said complementary casting cavity forming grooves,
• characterized by further comprising at least one venting member received in a venting member receiving recess in either of said die halves on the casting surface thereof so that said venting member is flush with said casting surface of said corresponding die half, said venting member at the top surface having casting cavity forming portions operatively associated with said die halves;
• a number of groups of obliquely extending parallel and linear narrow groove portions in the casting surface of the die half having said venting member receiving recess, said narror grooves forming an air path, an air passage formed between the wall of said venting member receiving recess and said venting member so as to communicate with said casting cavity forming grooves through said air path, said narrow grooves being disposed acorss both of the longitudinal and latitudinal member forming groove portions of the casting cavity and reaching the air passage in the venting member;
• vent means to vent any air in said casting cavity through said air passge out of said die assembly, said vent means comprising a space provided in said venting member to communicate with said air passage and collect said air therein;
• an air exhausting hole provided in said corresponding die half so as to communicate with said space in said venting member, and said air exhausting hole having a fitting to connect an exhauster to said air exhausting hole.