US1369947A - Method of making sand molds - Google Patents

Description

J. TOOLE.

METHOD OF MAKING SAND MOLDS.

APPLICATION FILED Aue.2, 1920.

' 1,369, 947. I Patented Mar-J 1, 1921.-

uarrao INT I C E JOHN TooLE, or vEnoNA, PENNSYLVANIA. assIer oa To UNI N STEEL CASTING COMPANY; or PITTSBURGH, rENNsYLvANIa, A CORPORATION OF PENNSYLf VANIA.

T 0 all whom it may concern I Be it known that I, JoH -TooLn, a resident of Verona, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in' Methods of Making Sand Molds, of which the following is a specification. I

In making large castings, such for example as locomotive frames and the like, it is necessary to remove the cope from the drag shortly after the casting has set. in order to permit unrestricted shrinking of 'the casting and thereby prevent the setting up of internal strains. In the prevailing foundry practices it is necessary, before the cope is removed, for workmen to stand upon the mold and either loosen the sand and remove the gaggers around the risers and pouring gate, or remove special fillers surrounding the risers. Because of the intense heat of the casting this isa difficult and much disliked task.

The object of this invention is to provide a method of making sand molds wherein, previous to the removal of the cope, it is unnecessary for workmen to stand upon'the molds in order to remove the sand and gaggers adjacent to riser or feeding heads, or to loosen and remove special fillers placed around risers and gate.

The method may be understood by reference to the accompanying; drawings which show apparatus for practising it. Figure 1 is a plan View of a portion of the cope of a flask prepared for the ramming up of sand surrounding a riser print; Fig. 2 a sectional View taken on the line II-II, Fig. 1; Fig. 3 a view corresponding to Fig. 1 showing the mold in readiness for the casting operation; and Fig. 4 a sectional view taken on the line IVIV Fig. 3.

The mold shown herein may, for example, be considered as a portion of a mold for easting a locomotive frame. In practising the invention a drag 1 containing a pattern 2 may be rammed up in the usual manner with properly tempered sand 3. Thereafter the cope is formed on the top of the pattern and around a riser print or prints of materially greater size than the riser. The cope and drag are then separated and the pattern removed from the drag and the riser prints METI ioD or MAKING SAND MOLDS. Y

Specification of Letters Patent. 7 P tent d Man 1, 1 2 Application filed August 2, 1920. Serial No. 400,680. k

placed in each opening previously formed v by the riser prints atubular core of internal size to correspond with the desired riser and externally of smaller size than such opening. If desired the space surrounding the riser core and between it and the wall of the-cope may be filled with loose sand. It has been found that by so forming the mold the cope may be readily removed from the drag at any time after the casting has set, and this without requiring the presence of workmen upon the hot mold.

Having reference again to the drawings, before the cope a is rammed up, suitable riser print pads 5' are placed upon the pattern and drag,.and upon such pads the riser prints 6 are placed. The gaggers 9 being placed in position, the cope is then rammed up, after which it is engaged by its lugs 15 and lifted so that the pattern 2 may be removed from the drag. The riser print 6 is also removed from the cope, andfor its careful manipulation during such removal it may be provided with a handle 10.

Before assembling the cope with thedrag to form the mold cavity, a riser core support 11 is placed in the position of the riser print pad 5, such core support having a restricted opening 12 for the upward flow of metal to form the riser. After assembling the cope with the drag the riser print core 14, of smaller size than the opening formed by the riser print, is placed in such opening, I there being left an annular space 13 between the wall of such opening and the outer wall forms a closure for the bottom of this annular space and projects beyond the wall of the opening. If desirable, this space may be filled with loose sand to prevent displacement of the riser core.

After the metal has been poured and has become sufliciently set to maintain its form, the cope maybe easily removed from the drag, the riser core and the loose sand surrounding it offering no resistance to such removal. Thus by forming the mold in the manner explained, workmen are not required to stand upon the hot mold to prepare the cope for its removal.

What has been explained with reference to the riser or risers is also applicable to similar cores and core supports for the gates or runners of molds.

According to the provisions of the patent 110 of the tubular core. The riser core support statutes, I have described the principle and claims, the invention may bepractised otherwise than as specifically described and illustrated, as well as in the formation of molds for casting other articles than specifically mentioned. I

I claim: 7

1. The method of making sand molds, consisting in forming a cope on a pattern and around a riser print of materially greater size than the riser, removing the pattern and riser print from the cope, assembling the cope with a drag, and placing in the opening formed by the riser print a tubular core of internal size to correspond with the riser and externally of smaller size than said opening, whereby a surface of cleavage is directly formed around the riser permitting the unobstructed removal of the cope after the casting operation.

2. The method of making sand molds, consisting in forming a cope on a pattern and around a riser print of materially greater size than the riser, removing the pattern and riser print from the cope, assembling the cope with a drag, placing in the opening formed by the riser print a tubular core of internal size to correspond with the riser and externally of smaller size than said opening, and filling With-loose sand the space in the copeoutside of the-core, whereby a surface of cleavage is directly formed around the riser permitting the unobstructed removal of the cope after the casting operation.

3. The method of making sand molds, consisting in forming a cope on a pattern and around a riser print of materially greater size than the riser, removing the pattern and riser print; from the cope, assembling the cope With a drag, placing in the bottom of i the opening formed by the riser print a core support, placing in said opening and on said support a tubular core of internal size to correspond with the riser and externally or" smaller size than said opening, and filling with loose sand the space in the cope outside of the core, whereby a surface of cleavage is directly formed around the riser permitting the unobstructed removal of the cope after the casting operation.

In testimony whereof, I have hereunto set my hand.

JOHN TOOLE.

Witnesses J. B. HENRY, J. P. TEIF.

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