US1645729A

US1645729A - Mold

Info

Publication number: US1645729A
Application number: US745408A
Authority: US
Inventors: Vaughan Conrad
Original assignee: Permold Co
Current assignee: Permold Co
Priority date: 1924-10-23
Filing date: 1924-10-23
Publication date: 1927-10-18
Anticipated expiration: 1944-10-18

Description

Oct. 18 1927.

. c. VAUGHAN MOLD Filed Oct. 25, 1924 C. VAUGHAN MOLD Filed Oct. 2.5, 1924 5 Sheets-Sheet 5 1mm l-manuu Patented Oct. 18, 1927.

CONRAD VAUGHAN, OF CLEVELAND, OHIO, ASSIGNOR TO 01' CLEVELAND, OHIO, A CORPORATION TIIE PEBMOLD COMPANY, OF OHIO.

MOLD.

Application filed. October as, 1924. Serial No. 745,403.

This invention relates to mold cores and has for its object to provide a sectional mold core of uniform transverse dimensions which I can be readily removed from a casting without damage either to the core or casting.

It is an object of the present invention. to avoid the necessity in forming the outer faces of mold cores with a. taper or draft to enable them to be freed froma casting whereby castings may be formed which have openings-of uniform cross sectional dimensions throughout the 'length thereof.

A further object of the invention is to provide a sectional core-formed of longitudinally tapered sections which interfit in such manner that the sections directly engaging the casting may be freed from frictional engagement with the casting before they are removed so thatthe core can be removed from a hot casting without danger of damaging the same.

The following description and accompanying drawings set forth in detail certain means embodying the invention, the d15- closed means, however, constituting but one of the various mechanical forms in which the principle of the invention may be em ployed.

Referring to the accompanying drawings forming a part of this specification.

Fi ure 1 is a top plan view of the mold of wliicha core embodying the present invention forms 8. art.

Fig. 2 is a slde elevation of the mold with thecore in place.-

Fig. 3 is a transverse vertical section through the center of the mold showing the core and casting in section.

Fig. 4 is ahorizontal section through the mold.

Fi 5 is a top plan view of the sectiona core.

Fig. 6 is a transverse-section showing the sections of the core separated.

F i 7 is a bottom'plan view of the sections. core.

Figs. 8 and 9 are side elevations of a tapered core section employed for two opposite corner portions of the core.

Figs. 10 and 11 are side elevations of the no core section employed for the other two corner portions ofthe core.

Figs. 12 and 13 are side elevations of the inner or key section of the core.

Figs. 14 and 15 are views showing the casting formed by the mold herein shown Fig.14 being 'an axial section and Fig. 15 being a top plan view.

Fig. 16 is a fragmentary sectional view similar to Fig. 3 showing Referring to the accompanying drawings the mold comprises two substantially identical side sections 1 mounted for movement into and-out of engagement with each other 06 upon a supporting bed 2, the two sections havingcomplemental cavities in their meeting' faces which have a shape corresponding to the contour of the outer surface of the casting which the mold is designed to produceythe sections also having complemental passages extending from the cavities to the tops of the sections to form the gate 3 through which the molten metal is introduced into the interior of the mold and the riser 3. The bed 2 is provided along 0 posite sides with guide rails 4 between w ich the sections 1 are slidably mounted, each section being connected to a hand lever 5 by means of which it may be shifted to or from its operative position. As shown in Figs. 3, 14 and 15 the mold herein shown is designed to form a relatively thin walled, hollow castin having a tubular body 6 and flanged ends a the casting shown being a reel, the body of which is rectangular in cross section. j

The present invention resides in the core of the mold which has an enlarged upper end portion A which is clamped between recessed portions of the side members 1 of the mold and rests thereon, and a body portion B which is of uniform transverse dimensions throughout its length and which extends throu h the mold cavity to form the interior of t e casting, the lower end of the core being clamped between the bottom plates 8 of the mold sections which are rethe core applied 60 I to a casting with a shoulderedinner' surface.

.endwise from the 'mold cavity.

cessed to receive the lower end of the body portion B of the core and form the bottom of the mold cavity.

As best shown in Figs. 5 to 13 the core consists of a number of longitudinally tapered sections, all of which extend the full length of the core, the sections when fitted together forming a solid core body, which is of uniform transverse dimensions from one end toward the other so as to form the in lerior ofthe hollow casting without taper from end to end. is in the form of a rectangular prism and the sections are so formed that those which directly engage the casting may be freed from the casting prior to withdrawal from the mold cavity. Two opposite corner portions of the core comprise identical sections 1.1 which are triangular in cross section and have inclined inner faces. The remainder of the core comprises two diagonally opposing corner sections 12 and the inner or key section 13.

As shown in Figs. 5 to 13 the'corner sec-,

tions 11 abut the

sections

12 and 13 in planes converging toward the axis of the core in the direction opposed to that in which the core sections are withdrawn from the casting, or they may be said to diverge from the axis of the core in the direction of withdrawal. The inner or key section 13 abuts the adjacent surfaces of the corner sections 12in two planes which intersect the diagonal of the prism through the corners 12 and the section 13 similarly abuts the adjacent surfaces of the corner section 11 in two planes which intersect the diagonal through the corners 11. Thus the sections of the core abut in four divisional planes converging toward the axis of the core. The divisionalplanes are so disposed. that their lines of intersection are beyond the end of the core so thatfthe sections extend the full length of the core. The converging pairs of divisional planes may be, as shown herein, equally inclined with respect to the longitudinal axis of the core, in which case the two sections 11 and the two sections 12 of the core are interchangeable.

The enlarged ends of the

sections

11, 12 and 13 of the core may be provided with

integral projecting lugs

14, 15 and 16 to facilitate removal of the sections from a casting.

Since the inner or key section 13 of the core has its four faces converging from its upper enlarged end, this section can be readily re moved byupward movement. 'When the section 13 is removed the two corner sections 12 are free to slide inwardly toward the axis of the core and may be freed from the surface of the casting and then removed After the corner sections 12 have been removed the corner sections 11 can of course be freely removed.

As shown herein, the core It should be noted that each of the four sections of thecore which engage with the casting are fully freed from the casting prior to withdrawal and that the sections cannot be removed except in the order above described. The sections 11 and 12 which form theouter portion.of,, the core have shoulders 17 at their'upper ends which engage with the top edges of the mold sections 1 to re tain them in proper position within the mold and the inner or key section 13 has a shoulder 18 at its upper end which engages the upper ends of the sections 11 and 12 to limit the movement of this wedge shaped key section into the core. a

The outer sections 11 and 12 are each provided below the shoulders 17 on-the-faces thereof which form the outside of the,core with a second shoulder 19 which lies at the top of the mold cavity, the portions of the sections above the shoulders 19 forming the enlarged head portion A of the core and the portions of the sections below the shoulders 19 forming the prismatic body portion B of the core which extends through the mold cavity. This construction insures that the portion of the core which has been in contact with the casting will not rub against the mold upon withdrawal of the core section and thus neither the core section or the mold will become abraded by small particles of the metal of the casting adhering to the core.

\Vhile the drawing indicates a .plate 9 disposed along one cornerportion of the mold cavity so that it forms a longitudinal split 10 in the casting, as shown in Figs. 14 and 15, it will be apparent that the core disclosed in this application may equally well be utilized for any casting having an opening therethrough entirely enclosed by the walls of the casting. Also, my core may be employed to mold openings which have portions of substantially the same transverse dimensions, each portion having side walls made up of parallel elements. The side walls may be prismatic, cylindrical or irregularly shaped and made up of parallel elements.

It will also be seen that the principle embodied in my core may be employed in connection with molding a casting having an inner opening with a shoulderso that one portion of the core is of one cross sectional area and another portion of another cross sectional area. This is indicated in Fig. 16

of the drawing, in which the casting 6 has an inner surface 6 with a shoulder and an enlarged inner surface 6". These may be prismatic or cylindrical and have parallel side walls and yet will be easilyformed by the core comprising parts 11 and 12, and having shoulders 20 thereon to form the shoulders on the casting.

Furthermore, it is to be understood that the particular forms of apparatus shown and Ion ' tions.

described, and the particular procedure setforth, are presented for purposes of explanation and illustration and that various modiportions of only two adjacent outer sides of the core, the second pair of outer sections co: operating with said first pair of sections to define the outer-longitudinal surface of the core, said key section being arranged to be readily inserted intermediate said outer core sections and removed from the assembled core, the inner surfaces of the first pair of sections being shaped to permit the second pair of sections to be moved inwardly toward the center of the core and vice versa when the key section is removed from the core, the second pair of sections being shaped so that inner surfaces thereof may cooperate with inner surfaces of said first pair of'sec- 2. A sectional permanent core arranged to cooperate with a mold to define a core'surface of quadrilateral cross section, said core having no inward draft to permit the core to be removed bodily from engagement with a casting after a casting operation, said oore comprising four outer longitudinal sections and an inner or key section, two of said outer sections being of substantially triangular cross section, two sides of each said triangular section defining portions of adjacent outer sides of the core, the inner sides of said triangular sections being substantially parallel when the core is in assembled position, a second pair of outer core sections, said second pair of sections being arranged to cooperate with said triangular core sections to define the outer longitudinal surface of the core, each of said second pair of sections having surfaces cooperating with said substantially parallel surfaces of said triangular sections, said key section being arranged to be readily inserted intermediate and in cooperative relation to the outer core sections and to be readily removed from the assembled core.

3. A sectional permanentcore arranged to cooperate with a mold to define a core surface of quadrilateral cross section, said core having no inward draft to permit the core to be moved bodily from engagement with a casting after a casting operation, said core comprising two pairs of opposed outer sections and an inner or keysection, each of the first pair of said outer sections defining portions of only two adjacent outer sides of ,the core, the second pair of outer sections 'COOPlELtLIlg Wlth said first pair of sections to define the outer longitudinal surface of the core, said key section being arranged to be readily inserted intermediate said outer core sections and removed from the assembled core, the inner surfaces of the first pair of sections .being shaped to permit the second pair of sections to be moved inwardly toward thecenter of the core and vice versa when the key section is removed from the core, the second pair of sections being shaped so that inner surfaces thereof may cooperate with inner surfaces of said first pair of sections, the inner surfaces of said outer core sections and the longitudinal faces of said "key section converging toward the bottom of said core when said core is in assembled position.

i 4:. A sectional permanent core arranged to cooperate with a mold to define a core sur face of quadrilateral'crosssection, said core having no inward draft to permit the core to be removed bodily from engagement with a casting after a casting operation, said core comprising four outer longitudinal, sections and an inner or key section, two of said outer sections being of substantially triangular cross section, two sides of each said triangular section defining portions of adjacent outer sides of the core, the inner sides of said triangular sections being substantially parallel when the core is in assembled position, a pair of outer core sections of pentagonal cross section, said pentagonal. sections being arranged to cooperate with said triangular core sections to define the outer longitudinal surface of the core, two inner sides of each pentagonal section bein arranged to cooperate with the adjacent inner sides of the triangular sections, said key section being arranged to be readily inserted intermediate-the outer core sections and removed from the assembled core.

5. A sectional permanent core arranged to cooperate with a mold to define a core surface of rectangular cross section, said core having no inward draft to permit the core to be removed bodily from engagement with acasting after a casting operation, said core comprising four outer longitudinal sections and an inner or key longitudinal section, said outer sect-ions being arranged to directly engagesaid mold to properly position said sections with respect to the mold, two of said outer sections being of substantially triangular cross section, two sides of each said triangular section defining portions of adjacent outer sides of the core, the inner sides of said triangular sections being substantially parallel when the core is in assembled position, a pair of outer core portions of pentagonal cross section, said pentagonal sections being arrangedto cooperate with said triangular core sections to define the outer longitudinal surface of the core,

two inner sides of each pentagonal section being arranged to cooperate with the adjacent inner sides of the triangxilansections, said key section being of suhstantial ly ree-v of said outer core sections and the longitudinal surfaces of said key section convergsignature.

QONRAD VAUGHAN;

*tangular cross section, all the inner surfaces