| 主权项 |
1. A method of manufacturing a side frame mold for casting a side frame of a railway car truck, where the side frame includes forward and rearward pedestal jaws for mounting a wheel assembly from a wheel set, the method comprising the steps of:
forming a drag pattern and a cope pattern that together define exterior surface features of a side frame, wherein the drag pattern and the cope pattern define exterior walls with draft angles of less than one degree; inserting the drag pattern and cope pattern into separate flasks and pouring a molding material around the patterns, wherein the molding material is a chemical or resin binder material, such as phenolic urethane; removing the drag and the cope patterns from the respective flasks, to thereby provide drag and cope portions of a mold that defines an exterior surface of a drag portion and cope portion, respectively, of the side frame, wherein the mold includes a portion for casting at least one pedestal jaw of the side frame and wherein the at least one pedestal jaw includes a pedestal roof, an outboard vertical jaw, an inboard vertical jaw, an inboard thrust lug, and an outboard thrust lug; forming a portion of one or more feed paths positioned in a center region of the mold; removing the drag and cope portions of the mold from the respective flasks prior to casting the side frame; arranging one or more risers in the mold, wherein a diameter of the one or more risers is less than 5 inches forming a portion of one or more feed paths in the drag portion of the side frame mold; wherein a maximum distance between and edge of the flask and a closest portion of an edge of a pattern to the edge of the flask is less than 3 inches; wherein the side frame mold is configured to accept one or more cores prior to pouring the molten material into the mold; wherein the one or more cores comprise:
a pair of pedestal cores;a bolster opening core;a spring seat core;a lower tension member core; anda pair of inner jaw cores; wherein the one or more risers comprise:
a first riser arranged proximate to a first upper corner of the bolster opening core;a second riser arranged proximate to a second upper corner of the bolster opening core;a third riser arranged proximate to a first lower corner of the bolster opening core;a fourth riser arranged proximate to a second lower corner of the bolster opening core;a fifth riser arranged proximate to an upper inboard corner of a first pedestal jaw; anda sixth riser arranged proximate to an upper inboard corner of a second pedestal jaw. |
