US1543229A - Pattern for making rolls - Google Patents

Description

' June 23, 1925. 1,543,229

W. H. NICHOL$ PATTERN FQR MAKING ROLLS Original Filed Nov. 1, 1922 2 Sheets-Sheet 1 I' l I l l INIENTOR W. H. NICHOLS PATTERN FOR MAKING ROLLS June 23, 1925. 1,543,229

Original Filed Nov. 1, 1922 2 Sheets-Sheet 2 Patented June 23, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM H. NICHOLS, OF WILKI'NSBURG, PENNSYLVANIA.

PATTERN FOR MAKING ROLLS.

Original application filed November 1, 1922, Serial No; 598,360. Divided and this application filed March 13, 1924. Serial No. 699,043.

To all whom it may concern:

Be it known that I, VVILLLADI I-I. NICHOLS, a citizen of the United. States, and resident ofv W'ilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Patterns for Making Rolls; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to patterns for molds for forming the necks of rolls cast in groups or clusters, and for similar purposes and it relates particularly to patterns for drag molds for use in casting clusters of rolling mill rolls.

The general object of my invention is to provide an improved sand mold for simultaneously casting two articles having horizontal runners in line with each other and embedded in the sand. In preparing such a mold it is a diificult matter to remove the patterns which form the runners. An important feature of my invention is the provision of a method of removing patterns from a mold of the kind described, this method consisting, in general, in providing an additional pattern which is removed after the mold is tam-pod and which gives access to the runner patterns. The opening or-openings left by the additional pattern are then closed by means of cores previously formed from molding sand or the like; This method of molding is set forth and claimed in my application for Letters Patent tiled Nov- 1, 1922, Serial No. 598,360, of which the present application is a division.

In my Patent 1,455,091, issued May 15, 19-23, I have described and claimed a novel method of casting chill rolls consisting in arranging a plurality of molds around a common upright pouring gate and pouring molten metal simultaneously through the upright gate into all of the molds. As shown in said patent, the chills and the upright gate-borare all'mounted upon a common drag flask in which the neck cavities, horizontal sprue-runners and the lower end of the upright pouring gate are: molded in sand, I

My prior application No; 598,360,. and also the present application, are continuations of the application. for Patent 1,455,091, mentioned above. The present application is specifically concerned with the patterns by means of which the neck cavities, spruecavities are connected by means of runners with a common pouring gate.

In the accompanying drawing, Fig. 1 is a vertical sectional view through a group of chill molds arranged for casting rolls according to my above-mentioned patent, and provided with a drag mold constructed according to my present invention; Fig. 2 is a plan view of the drag flask and patterns;

Fig. 3 is a vertical sectional view of the drag flask and patterns shown in Fig. 2; Fig. 4: is a vertical sectional View similar to- Fig. 3, showing the flask filled with sand and inverted preparatory to removing'the patterns; Fig. 5 is another vertical sectional view similar to Figs. 3 and 4:, showing the manner in which the sprue patterns, are removed; Fig. 6 is another vertical sectional view similar to Figs. 3 to 5, showing the final appearance of the mold after the pat-' terns have been removed and the core blocks placed over the sprue runners; F 7 is a plan view of the complete drag mold shown in section on Fig. 6; Fig. 8 is a detail plan view showing the construction of the patterns used in molding the sprue runners; Fig. 9 is a detail plan view showing the core blocks which are placed over the inner portions of the sprue runners after the patterns have been removed and Fig. 10 is a detail showing in vertical section the relation between the core blocks and the sprue runners.

In the drawing the numeral 2 indicates a metal drag flask designed for casting four chill rolls. In order to receive the neck molds for the four rolls, the flask 2 is provided with four recesses 3 of generally circular form which communicates with a common central space through straight channels 5.

Fig.8 shows a wooden pattern consisting of a four-armed member or cross 10 having a central projection 11 extending from one surface thereof. The pattern also includes four sprue patterns, each consisting of two sections6 and 12, which are made separate from the cross 10 and are adapted to be laid thereon when the pattern is as- 7 and 10.

sembled. Four neck patterns 13 are also provided for shaping the necks and couplers of the rolls, as shown in Fig. 3, each having a pin 14 adapted to enter the openings 9 in a follower-plate 7 which rests on the usual bumper, not shown.

In assembling the mold patterns, the flask 2 is placed in proper position on the follower plate 7, the cross 10 is set in the center of the flask, the sprue patterns 6 and 12 are then laid upon the arms of the pattern member 10, as shown in Figs. 3 and 8, and the neck patterns are placed in position at the ends of the sprue runners, with their pins lt inserted in the openings 9. A little sand should be placed under the projecting sprue patterns 12, as shown at 15, Fig. 3, in order to prevent these patterns from tipping over. Molding sand is then tamped into the flask in the usual manner, care being taken that the sand shall be forced beneath the sprue patterns 12.

After the sand .is tamped in the flask, the flask is inverted upon a suitable bottom plate 16, as shown in Fig. 1. The neck patterns 13 are then lifted out, and the four-armed pattern member 10, is also lifted from the sand. This leaves the sprue patterns still embedded for a portion of their length within the sand. In order to remove these sprue patterns the inner pattern sections 6 are lifted, as shown in Fig. 5, leaving room for the outer sections 12 to be pulled lengthwise into the open space left by the fourarmed pattern 10. The sections 12 are pulled horizontally one by one in the manner stated, and are lifted sidewise and vertically from the mold.

The spaces originally occupied by the four arms of the pattern member 10 are then filled with core blocks 17 previously molded from molding sand and of proper size to fit in these openings, and covering the sprue runners 18, as shown in Figs. 6, The neck cavities 13 are then finished and coated in the usual manner, and the drag is ready for use as shown in Fig. 2. When the drag is assembled with the chills and upright gate box, substantially all of the upper surface of the sand is covered by these parts which prevent the sand from being forced up above the sprue runners during the pouring operation. The arms of the cross pattern 10 have their sides tapered slightly, as shown in Figs. 3, 4 and 10, in order that this pattern may be readily lifted from the sand, and the sides of the core blocks 17 are similarly tapered.

Fig. 1 shows the complete assemblv of the group of chil mold: :ling the dra mold described above. chills 20, upper boxes 21, sink head 22, and an upright gate box 23 to the upper end of which is secured a funnel 24. The vertical opening 25 in the upright gate box is in line with the central opening 26 in the upper surface of the drag mold, and the sprue runners 18, molded in the manner described above, communicate radially with this central opening 26 and enter the neck cavities 13 tangentially in order to produce the proper swirling movement of the metal.

In the operation of the mold shown in Fig. 1 to form a group of rolls, the molten metal is brought to the mold in a ladle and is poured into the funnel 24L, whence it passes down through the upright channel 25 in the upright gate box 23 and through the horizontal sprue runners 18 into the lower portions of the molds. Some of the molten metal remains in the central cavity 26 and serves as a cushion to prevent the descending metal from splashing.

It will be observed that the sides of the sprue runners 18 converge before entering the neck cavities of the molds. This gives a nozzle effect, causing the molten metal to be injected into the molds more forcibly than would be the case if the sprue runners were of uniform cross section throughout their length.

After the rolls are cast the chills and the upper boxes are removed and the cast rolls are lifted from the drag. 'Since there is nothing at this time above the sprue runners 18 except molding sand, the metal which has solidified in the horizontal runners is easily lifted from the drag, sometimes carrying with it the molding sand, and at other times breaking through the molding sand.

I claim as my invention:

1. Molding apparatus comprising a pattern member and a second pattern member adapted to be laid upon said first-named pattern and to project beyond said firstnamed pattern member, and a wall-forming block adapted to be inserted into the recess formed by the first-named pattern member, upon removal of the pattern members, to form a wall for the recess produced by the said second pattern member.

2. Molding apparatus comprising a pattern member and a narrower pattern member adapted to be laid upon said first-named pattern member and to project beyond said first-named pattern member, said second pattern member being composed of two separate sections laid end to end.

3. Molding apparatus comprising a pattern member having two oppositely extending arms separated by a projection, pattern members adaptedto be laid upon the arms of said first-named pattern member and to project beyond the ends of said arms, and wall-forming blocks adapted to be inserted in the space occupied by said arms upon removal thereof.

4. Molding apparatus comprising a pattern member having two oppositely extending arms separated by a projection, and pattern members adapted to be laid upon the arms of said first-named pattern member and to project beyond the ends of said arms,

each of said second pattern members being composed of two separate sections laid end to end.

5. Apparatus for making molds for casting chill rolls in groups comprising a pattern member having four horizontal arms and having a vertical projection at the junction of said arms, and sprue patterns narrower than the arms of said first-named pattern member, said sprue patterns being adapted to be laid upon the arms of said first-named pattern and to project beyond the ends of said arms, the recesses produced by said four arms being adapted to receive blocks for forming one wall of the sprues produced by said narrower patterns.

6. Apparatus for making molds for casting chill rolls in groups comprising a pattern member having four horizontal arms and having a vertical projection at the junction of said arms, and sprue patterns narrower than the arms of said first-named pattern member, said sprue pattern being adapted to be laid upon the arms of said first-named pattern and to project beyond the ends of said arms, each of said sprue patterns being composed of two separate sections laid end to end.

7. Apparatus for making molds for casting chill rolls in grou s comprising a pattern member having our horizontal arms and having a vertical projection at the unction of said arms, and s rue patterns narrower than the arms 0 said first-named pattern member, said sprue patterns being adapted to be laid upon the arms of said first-named pattern and to project beyond the ends of said arms, the outer section of each of said sprue patterns being tapered toward its outer end, the recesses produced by said four arms being adapted to receive blocks for forming one wall of the sprues produced by said narrower patterns.

In testimony whereof I, the said WIL- LIAM H. NIoHoLs, have hereunto set my hand.

WILLIAM H. NICHOLS.

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