Forming a mold for steel casting
a mold and steel casting technology, applied in the field of mold forming, can solve the problems of time-consuming and expensive processing of such large amounts of sand, and achieve the effect of improving efficiency and dimensional accuracy
Active Publication Date: 2014-09-18
AMSTED RAIL CO INC
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- Description
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AI Technical Summary
Benefits of technology
The present invention is a better and more accurate way to create a mold for making parts of a railway car truck. This method can help create more efficient and precise molds for things like steel bolsters and sideframe couplers.
Problems solved by technology
The formation of the cope and drag halves of the mold for use in forming such cast steel components has a major disadvantage in that an assembled bolster mold comprised of a bottom or drag half and a top or cope half, comprises over 4,000 pounds of green sand, not including the cores placed into the drag half before the cope half is placed on top to form a complete mold for pouring.
Such processing of such large amounts of sand is both time consuming and expensive.
Method used
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Embodiment Construction
[0056]Referring now to FIGS. 1 and 2, a sideframe drag flask is shown generally at 10. Such sideframe drag flask 10 is typically comprised of cast steel sections 22, 24, and 26, with each section bolted together as shown and will be described below with reference to FIG. 4. However, sideframe drag flask 10 may also be comprised of a single piece, usually a steel casting.
[0057]Each component sideframe drag flask section is comprised of cast steel with an near net shape oversized impression of a sideframe drag pattern formed as 12 on the top surface 18 of sideframe drag flask 10. Engineering judgment and foundry practice is used in the degree of oversizing required for near net shape oversized impression 12 of the sideframe drag flask. The reason for such engineering judgment is that an exact pattern of the sideframe drag will be placed on top of sideframe drag flask 10; accordingly, a spacing will be formed between pattern edge 14 and oversized impression 12. A resin sand will form r...
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Abstract
A method of forming a mold for use in the casting of a steel railway freight car truck component is provided. A cope mold is formed by providing a near net shape oversize impression of a cope pattern of a product to be cast in a flask. A cope pattern of the product to be cast is then placed on the flask forming a spacing between the cope pattern and the oversize impression. A resin coated sand is then blown to form a sand layer between the oversized impression in the flask and the cope pattern. The resin sand is set to form a mold of a thickness between the oversized impression in the flask and the cope pattern of the product to be cast. The drag mold is formed in a similar manner.
Description
BACKGROUND OF THE INVENTION[0001]The present invention relates to a method of forming a mold for use in casting steel products, and, more particularly, to a method of forming a mold for use in the manufacture of steel castings such as bolsters, sideframes, couplers, yokes, draft sills and related components for railway freight car trucks.[0002]Traditionally, such steel castings for railway freight car trucks are comprised of cast steel components that are unitary in structure. Such steel castings are typically comprised of steel that is poured into green sand molds. Such green sand molds are typically formed by the injection and compaction of green sand, of which clay is the binder element, by a slinger into a cope or drag pattern placed in a flask. Alternately, such flask can be placed over the cope or drag pattern and green sand is poured to fill the flask, whereupon the flask is jolted to set the green sand cope or drag pattern in the flask.[0003]The formation of the cope and dra...
Claims
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IPC IPC(8): B22C9/22B22C9/02
CPCB22C9/02B22C9/22
Inventor BAUER, TONYCALLAHAN, THOMAS
Owner AMSTED RAIL CO INC