US1059667A

US1059667A - Method of stripping ingots from their molds and apparatus therefor.

Info

Publication number: US1059667A
Application number: US73984413A
Authority: US
Inventors: Emil Gathmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-01-02
Filing date: 1913-01-02
Publication date: 1913-04-22
Anticipated expiration: 1930-04-22

Description

B. GATHMANN.

METHOD OF STRIPPING INGOTS PROM THEIR MOLDS AND APPARATUS THEREFOR.

APPLICATION FILED JAN. 2, 1913.

Patented Apr. 22, 1913.

E. GATHMANN. METHOD OF STRIPPING meo'rs FROM THEIR MOLDS AND APPARATUS THEREFOR.

APPLICATION FILED JANZ, 1913.

Patented Apr. 22, 1913.

3 SHEETS-SHEET 2.

E. GATHMANN. METHOD OF STRIPPING mews FROM THEIR MOLDS AND APPARATUS THEREFOR.

APPLICATION FILED JAN. 2, 1913' 1,059,667, Patented Apr. 22, 1913.

, s SHEETS-SHEET 3.

Emu. GATHMANN, or BALTIMORE, MARYLAND.

misrnon or srarrr'me meors rnom THEIR-moms AND APPARATUS THEREFOR.

Specification of Letters Patent.-

Patented Apr. 22, 1913.

Application filed January 2, 1913. Serial No. 739,844.

To all whom it mayconcern Be it known that I, EMIL GATHMANN, a. citizen of the United States, residing in Baltimore city, State of Maryland, have invented certain new and useful Improvements in Methods of Stripping Ingots from Their Molds and in Apparatus Therefor,

of whichthe following is a specification.

This invention relates particularly to the manufacture of ingots in which molten metal is poured into a mold having a chamber larger in diameter at the top .than at the bottom. Heretofore after the ingot has partially solidified in such molds. it has been customary to reverse or turn the mold with the contained ingot upside down and then lift the mold away from the ingot, but this operation besides being diflicult results in the formation of pipe in the body of the ingot producing flaws in the final product.

The primary objectof my invention is to provide an efiicient way of withdrawing the ingot from'the. mold without reversing it. To accomplish this result I form an opening in the bottom of themold and arrange therein an. ingot lift-er which projects downwardly from the mold into an 1 opening formed in the mold stoolor support.

The. lifter is adapted to move vertically relatively to the mold and when so. moved to lift the ingot until its upper end projects sufficiently above the top of the mold to allow grippers to engage it and entirely withdraw the ingot from the mold. After the ingot is cast and sufliciently solidified the mold, with its contained-ingot and the lifter thereunder, are lifted from the truck or support on which they are 'carriedwith the lifter projecting downwardly from the bottom of the mold and then they are low- -ered upon a support which engages the bot ingot is moved tom of the ingot lifter, then the mold is either allowed tofurt-her descend by gravity or is forced downward by mechanism which preferably engages the mold near its upper end. In this way the upper partof the out of the nold and maybe engaged by grippers of usual construction which withdrawit entirely from the mold and carry it away. When the mold is thus forced down by power great strain is pro.- duced on the truck or support beneath if someprovision is not made for preventing inland in order to relieve this strain I pro ride means which so hold the mold during the stripping operation thatsuch pressure he platform o fh means a flanged. rests on the platform.

is received by hangers which engage the mold stool. It will thus be observed that I taneously apply power which raises or tends to raisethe mold stool while the mold is being forced downward relatively to the stool.

In the accompanying drawings, Figure 1 is a diagrammatic sectional view showing mechanism v -embodying my improvements for stripping ingots. Fig. 2 is'a view partly in side elevation and partly in section of parts of such mechanism. Fig 3 -is a perspective view of one of the mold stools. Fig. 4 is a view on an'enlarged scale partly in elevation and-partly in section of the stripping mechanism. Figs; 5. and 6 are detail views of modifications in which the ingot lifter is proyided with means for preventing it from being lifted. out of the mold chamber withv the ingot-tgiiFigs. 7, 8 and 9 are views showingfurthcr modifications.

5 Each mold A'may be"'of any suitable construction. but *is preferably ofthe form shown where-the'lowerpart is made relatively thick and the upper part relatively thin whereby the lowerpart-of the ingot X .is made to cool "and solidify more rapidly than the upper part thereof. The chamber of each mold is larger in diameter at' the top than at the bottom and it is open at opposite ends.- Through the bottom 9 ening a of each mold projects an ingot ifter B which also serves to seal the bottom of the mold chamber. The upper portion of. the lifter is preferably tapered, as shown, to fit closely the correspondingly ta ered openin a and a considerable po ion of the lii er projects below the bottom'offthe mold as ind-icatedin Figl It is customary to place the molds on trucks and to teem them while so supported and after teeming to'move the truck-to the stripping mechanism When. trucks are thus used I preferably construct them in thewayshown, 2 'e each truck C is provided with a removable stool which has a part d. at ndiu. thr'qugh portion d which lit be observed that each stool is formed with a part a adapted to receive the ingot lifter D in the manner indicated in Fig. 2.

The traveling crane, shown in Fig. 1, is of well known construction. The part E is constructed to travel on suitably supported rails 0 while the part F travels on rails 6 arranged at right angles to the rails e. The apparatus F is similar in many respects to that heretofore used in ingot stripping plants,*z'. 0., there is a truck 7' supporting a motor 7' and a windlass F. The casing f depending from the truck is adapted to contain lifting mechanism which it is not necessary to illustrate. It is suflicientto say that a rod G, which is threaded at its upper end (g) carries at its lower end a yoke H comprising arms 71 which are adapted to engage lugs a on the neck of the mold. The rod may be raised and lowered by the mecha nism indicated and thus raise and lower the mold. It will be observed that the arms h are so formed on their lower ends as to so engage the lugs a that the mold is not only raised and lowered, but on the downward movement of the rod the mold is not merely lowered but is forced downward positively so that inthe stripping operation if the ingot tends to stick in the mold it will be separated therefrom by reason of the additional pressure thus employedr Ordinarily the weight of the mold is sufficient, but if there are imperfections in the mold due to any roughness or irregularities in the mold chamber, the weight of the mold itself is insutlicient to eifect the separation of the ingot. and so it has sometimes been the practice to drop the mold suddenly to effect the desired separation but this dropping of the mold imparts undesirable strams to the mold support which, by my improvements, are avoided.

The rod G extends through a yoke I to which are pivotally connected hangers J having at their lower ends loops j adapted to engage the lugs d of the mold stool D. Itis not necessary, however, always to employ these hangers as frequently the ingot may be raised in "the mold by merely lowering it on the ingot lifter slowly and without 1mparting any strains on the truck and I have provided mechanism by which the hangers J may be held out of operative position or may be brought into engagement with the stool when required. For this purpose I preferably employ cables L, L which are connected, in the manner shown in the drawings, to the hangers and also connected with osses? mold, such mechanism being also employed for conveying the ingot to a soaking or re.- heatmg pit or to any other desired place. The ingots are cast in the molds A when supported by trucks C with the ingot lifters B in their lowermost position, as shown atthe left hand side of Fig. 2. After the casting operation the truck is moved to the stripping plant, the lifting yoke H being so constructed, as shown in Fig. 1, that it may be made to engage the lugs a of the mold by merely moving the truck properly over its supporting railsQ. When the lifting yoke thus engages the mold the former is raised so as to withdraw the lifter B from the stool D and then the truck is shifted until the lifter is disposed above the part d" of the stool, then the mold is lowered and the ingot is raised relatively to the mold, in the manner indicated in Fig. 9, inasmuch as the lifter remains stationary at this time. If neces sary. when the mold is being lowered, the requisite pressure may be applied to it down wardly to cause the separation of the mold and ingot. If such additional pressure 1s very great, or of such nature that it would place undue strain on the truck, the hangers J are brought into operation. This'may be done by suit-ably operating the cables L, L and when the hangers engage the stool, in the manner indicated in Figs. 1 and 4, the downward thrust imparted to the mold by the rod G is received ultimately by the hangers J and thus the truck may be entirely relieved from pressure.

It sometimes happens that the ingot lifter" will adhere to the mgot when the latter is being lifted out of the mold; To prevent this I may use a pin N-which projects horizontally through the lower end of the lifter and is received in a recess n in the bottom of the mold, or I may use a collar or plate 0,

as indicated in Fig. 6. The apparatus may be somewhat simplified thus,-the yoke for raising or lowering the mold may be of the form shown at P in Figs. 7, 8, and 9. In this case the lugs a of the mold enter recesses formed in the arms p of the yoke and instead of employing alifter of the kind shown at B, I may provide the mold with a suitable sealing stool and may use a separate lifter, such as shown at S in Fig. 8.

I claim as my invention:

1. The method herein described of stri ping ingots, which consists in raising a. 1110 d with its contained ingot and with an ingot lifter projecting from the lower end of the mold, lowering the mold, ingot and lifter onto a support which causes the lifter to raise the ingot partway out of the mold chamber, pressing the mold downwardly while the ingot is being raised within it and then gripping the upper part of the ingot and lifting it out of the mold.

2. The method herein described of stripping ingots, which consists in raising the mold with its contained ingot from their support, pushing the ingot upwardly in the mold and simultaneously ressing the mold downwardly while the li ter is raising the ingot and then gripping the upper part of the ingot and lifting it out of the mold.

3. The method herein described of stripping ingots from molds having separable stools, which consists in raising the mold with its contained ingot from the stool, lowering the mold and ingot over an ingot lifter supported by the stool which raises the ingot part-way out of the mold, simultaneously applying upward pressure to the stool to relieve the mold support of strain and then gripping the upper part of the ingot and lifting it out of the mold.

4. An ingot lifter adapted to engage the bottom of an ingot and means adapted to engage the mold to lift, lower and press it positively downward on the-ingot lifter.

The combination with a mold provided with an ingot lifter, of arms engaging the mold and means for operating the arms to lift the mold and to lower and press it positively downward.

6. The combination of a mold provided with an ingot lifter and having laterally projecting lugs, of a -yoke comprising arms adapted to engage said lugs, and meansfor raising and lowering the yoke to raise the mold, to lower it and to press it positively downward.

7. The combination of a mold having a vertically moving ingot lifter at itslower end and provided with laterally projecting lugs at its upper end, a yoke engaging the lugs on their upper and lower surfaces and means for lifting the yoke. and for slowly pressing the mold downraising and lowering it, an ingot lifter,

means for pushing the mold downward over the lifter, and means for drawing the lifter upward.

10. The combination of a mold support, a mold, a stool interposed between the mold and the support and which is separable from the mold and from the support, means for raising and lowering the mold, an ingot lifter supported at times by the stool, means for raising and lowering the mold and means for supporting the mold stool while the mold is being lowered.

11. The combination with an ingot mold having an opening in its lower end, of an ingot lifter projecting through said opening and means on the lower end of said lifter for limiting its upward movement in the mold chamber.

12. The combination with a mold having an opening in its lower end, an ingot lifter projecting through said opening and sealing it, a stool having an opening through which the ingot lifter extends and a support for said lifter when the mold is raised,-

means for raising and lowering the mold, hangers separably connected with the stool and means for operating said hangers.

In testimony whereof, I have hereunto subscribedmy name.

. EMIL GATHMANN. Witnesses:

Maura Mnwsmw, ALEX C. GROOME.