US2313253A - Metallic mold - Google Patents

Description

'H. E. MCWANE METALLIC MOLD lMarch 9, 1.943. l

Filed 01:1.,1, 1941 2 sheets-shea; 1

5MM W? March 9,1943. H. E. MCWANE 2,313,253

METALLIC MOLD I 'Filed oct. 1, 1941 sheets-sheet 2 Patented Mar. 9, 1943 UNHTED STATES This invention relates to molds and more particularly it has reference to permanent metal molds that will not warp during the casting operation. 'Ihis application is a continuation in part of my copending case, Serial No. 390,411, filed April 25, 1941.

Practice has shown that while my metal mold may warp .003 to .096 inch the first day in operation, the warping will be progressively less the next two days until finally no further warping is measurable. This is probably due to gradual annealing of the copper face in use until molecular arrangement finally sets. Of course, the warping above referred to is permanent warping, that is, the failure of the mold to return to its original shapegand not the temporary warping caused by temperature diierences in the metal during pouring. l

I have found that there is no heat change in a rigid backing, and if it is of sufcient strength to withstand mechanical strains and is properly cured, the backing in conjunction with a highly ductile mold face will afford an excellent permanent mold not subject to warpage in the casting processes.

More specifically, my mold comprises a mold face'of copper or some other ductile metal and a peripheral backing of a relatively stili non-ductile metal attached to the back of the mold face. Rigid transverseribs are connected t the sides of the backing and the upper face of each rib is also xed to the back of the mold face. Preferably thebacking and transverse ribs are welded to the mold face, thus alfording a continuous intimate attachment that is particularly efficacious in'that it prevents warping of the mold face.

A cover plate is detachably secured to the backing and in combination with the rigid backing forms a water jacket for the mold. Under some conditions, the mold face may be provided with recesses for giving a maximum cooling area to the mold.

An object of this invention is to provide a permanent metal mold that is durable, not subject to warpage and inexpensive to manufacture.

And a further object of this invention is to provide a water jacheted mold with a mold face of a highly ductile metal and a rigid non-ductile ribbed metal backing for the face.

An additional object of the present invention is to provide a permanent metal mold having a ductile mold face and a relatively stiff non-ductile metal backing welded thereto whereby warpage of the face`is prevented.

with these and other objects in view, which may be incident to my improvements, the inven-V tion consists in the parts and combinations to be hereinafter set forth and claimed, with the understanding that the several necessary elements comprising my invention may be varied in construction,l proportions and arrangements, without departing from the spirit and scope of the appended claims. f

In order to make my invention more fclearly understood, I have shown inthe accompanying drawings means for carrying the same into practical effect without limiting the improvements in their useful applications to the particular constructions which, for the purpose of explanation, have been made Ithe subject of-illustration.

In the drawings:

VFigure 1 is a plan View of one half'of a mold block constructed according to. my invention.

Figure 2 is a view similar to Figure 1 showing the complemental mold block. Figure 3 is a sectional View taken along the line 3--3 of Figure 1 lookingv in the direction of the arrows and also illustrating the other mold block in its operative position.

Figure liris a transverse sectional view show,-` ing a modified form of mold block that -may be' employed. f

Figure 5 is a bottom view of the mold block illustrated in Figure 3 with the cover plate for the water jacket removed. Y l.- i Figure 6 is an exploded viewiillustrating the various parts that constitute the mold.

In Figures 1 and 2, I have shown a permanent metal mold I comprising complemental mold blocks iA and iB. Each mold'block is made of a metal of high ductility, `such as, copper or cuprous alloys. Inother words, the members IA and IB must be of a material that will have the property of resisting repeated heatings andcoolings without checking or cracking. v y

I have determined that the mold blocksvshould be relatively thick, and the minimum thickness should be one inch. This structure gives added rigidity to the mold and affords a more even dissipation of the heat. In addition, the danger of ssures extending to the water jacket is minimized materially. When the mold block IB is disposed on the block IA to form the complete mold, a molding cavity 2 is defined, as shown in Figure 3.

In Figures 3 and 6, it can be seen that a peripheral backing 3 of relatively stiif non-ductile material, for example, iron or cast steel, is welded to the back of the mold block IA, as indicated at 4. The backing conforms to the shape of the block and is provided with a flange 5 at its outer end. A cover plate 6 is disposed Within the flange 5 and bears against a shoulder 1 formed on the flange. A fiat member of compressible material 8 of the same size as the plate 6 is 1ocated between the plate and the shoulder to afford a seal-tight union between the cover and the backing member 4, and the cover and flat member are secured to the backing 3, by bolts I0. The cover plate 6, the backing 1I, and the lower face of the mold part IA denes a water jacket indicated generally by the numeral II.

In order to strengthen or reinforce the mold block IA, it will be observed that a plurality of transversely extending ribs I2 are provided'. The ends of each rib I2 are xed to the sides of the backing 3 and the upper face of each rib is welded to the lower side of the block IA, as indicated at I3. It should be noted, however, that the lower face of each rib I2 terminates a. distance above the compressible material 8 so that the cooling mediumY in the jacket II may circulate freely throughout theV water jacket.

UnderV certain circumstances, it is desirable that a larger coolingsurface be provided, and it can be seen that the mold block IA is formed with a plurality of recesses I5 into which the cooling liquid can iiow.

In view of the fact that the mold block IB is substantially the same in construction as the block IA, the same reference numerals are used with the exception that they are primed.

From the above description, it is thought apparent that I have provided a permanent metal mold, the ductile mold face of which has attached thereto a rigid non-ductile backing, which, in addition to preventing warping of the moldl face, will in combination with the cover plate afford a water jacket for the mold. By having the mold face of a metal, such as copper, the mold face will have the property of resisting the cycles of heatings and coolings without checkingl or cracking.v

By welding the backing and the ribs to the mold face, there is provided an attachment which is continuous andV this feature is highly importantV in that there is afforded a structure which will rigidly support the mold face and prevent distortion in all directions.

In Figure 4, I have shown a mold which is similar to 1that illustrated in Figures 1 to 3, with the exception that the mold face is relatively thin inV cross section, as indicated by the numeral 30.

In this embodiment, therecesses for providing a specifically, by providing a relatively stiff nonductile backing for the ductile face, I am able to prevent the warping of the face during the casting operations.

Moreover, the mold is quite simple in structural details, and can be cheaply and easily manufactured.

While I have shown and described the preferred embodiment of my invention, I wish it to be understood that I do not conne myself to the precise details of construction herein set forth by way of illustration, as it is apparent that many changes and variations may be made therein, by those skilled in the art, without departing from the spirit of the invention, or eX ceeding the scope of the appended claims.

I claim:

l. A permanent metal mold comprising a ductile mold face, a peripheral backing member attached thereto, transverse ribs connected to the sides of said peripheral backing member, said backing member and ribs preventing warpage of the mold face during the casting. operation and a cover plate attached to the peripheral member for forming a water jacket for the mold.

2. A permanent metal mold'comprising a ductile mold face, a peripheral backing member welded thereto, transverse ribs welded to the sides of the peripheral backing member and the mold face thereby preventing warpa-ge of the mold face during the casting operation and a cover plate attached to the peripheral member for forming a water jacket for the mold.

3. A permanent metal mold comprising a ductile mold face, a peripheral backing member welded thereto, and transverse ribs welded to the sides of the peripheral backing member and the mold face whereby warpage of the mold face during the casting operation is prevented.

4. A permanent metal mold comprising a mold face of copper, an iron backing welded thereto, and'iron transverse ribs welded to the backing and to the mold face whereby warpage of the mold face during the casting operation is prevented.

5. A permanent metal mold comprising a highly ductile mold face, a ferrous backing welded thereto and ferrous transverse ribs welded to the backing and to the mold face whereby warpage of the mold face during the casting operation is prevented.

6. A permanent metal mold comprising a ductile mold face, a peripheral backing member attached thereto, reinforcing means attached to the said peripheral backing member and to the mold face, said backing member andreinforcing means preventing warpage of the mold face during the casting operation, and closure means attached to the peripheral backing member which forms a water jacket for the mold.

HENRY E. MCWANE.

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