Process of making metallic stripping-plates.

Abstract

Claims

(No Model.) Patented May 2|, l90l. E. SAILLOT. PROCESS OF MAKING METALLIC STRIPPING PLATES. (Application filed Oct. 23, 1899.) 2 Sheets-Sheet I. No. 674,430. v Patented May 2|, 190i. E. SAILLDT. PROCESS OF MAKING METALLIC STRIPPING PLATES. (Application filed Oct, 23, 1899.! 2 Sheets$heet 2. (No Model.) Tn: Norms P512! co PnoToL'rma, WASHINGTON, o. c. UNITED STATES PATENT OFFICE. ERNEST SAILLOT, OF PARIS, FRANCE. PROCESS OF MAKING METALLIC STRIPPING-PLATES. SPECIFICATION forming part of Letters Patent N 0. 674,430, dated May 21, 1901. Application filed October 23, 1899- Serial No. 734,443- (No specimens.) To at-ZZ whom it may concern: Be it known that I, ERNEST SAILLOT, foundry manager, a citizen of the Republic of France, residing at 8 Avenue de la Republique, Paris, France, have invented a certain new and useful Process of Making Metallic Stripping-Plates used in Foundry Works for Getting the Patterns out of the Molds,of which the following is a specification. This invention relates to the art or process of forming stripping-plates for molds, particularly for molds used with patterns having high projections or projections difficult to remove to prevent injury to the mold by withdrawal of such patterns. In the drawings, Figure 1 is a perspective view of a pattern with high projections. Figs. 2, 3, 3*, and 3 illustrate difierent stages of the procedure of manufacturing the strippingplate. Fig. 3 is a bottom plan of Fig. 3. Fig. 3 is an enlarged view of a detail. Figs. 5, 6, and 7 illustrate a second application of the procedure. The piece or pattern shown in Fig. 1 has a body a and two highthat is, comparatively longprojections a a, parallel to each other and at right angles to body a. This particular form of pattern is taken merely as an illustration or example of a form of pattern requiring a stripping-plate. The first step is to form a mold of the pattern in ordinary molding-boxes b and c, the pattern being held so that the plane of the joint between said boxes passes just under the body a, as in Fig. 2. The box 0 is then removed and the pattern is carefully taken from box b and the mold patched up, if necessary. Ithen fill or nearly fill the depressions made by projections at, preferably first partly filling with cotton-waste 7, and on top thereof nearly or quite to the top of the lower mold is placed a covering 8 of sand. The exact material for filling is not importan but should be such that the shape of the depressions will be shown on the upper mold-section 0 when formed thereon. On mold I) thus prepared is formed another mold 0, having a runner-hole d. This stage is shown in Fig. 3. The upper mold in being formed takes on its lower side an exact impression of the depressions formed by parts a in the lower mold by the adherence thereto of some of the sand placed above the cotton-waste or by material from the upper mold extending slightly into the tops of the depressions. The upper mold is then removed from the lower, after which I cut out sand from the lowerside of mold c to a depth equal to the thickness of stripping-plate desired; but in doing this care is taken to leave projecting from the bottom of mold c the parts 9 of size and shape corresponding to the parts of the pattern forming the high projections. Parts 9 are most clearly shown in Figs. 3 and 3 The boxes I) c are then put together again, as shown in Fig. 3, and metal is poured through hole d, thus casting a stripping-plate Q, with slits e, adapted to closely fit projections a. As indicated in Figs. 1 and 3", the projections may be slightly beveled, the lower ends, however, being of the thickness of projections athat is, to snugly fit around such projections when the strippingplate is put to the use for which it is designed. As above described, the stripping-plate is for molds having a flat or plain joint between the upper and lower mold-sections; but the steps taken in forming the stripping-plate when the form of the pattern is such that there is a broken joint between the mold-sections, as in Fig. 6, is the same as above described. In Figs. -5 and 6 I have shown a two-part pattern a, a, the parts havinga broken joint 1 2 3. The part a, which constitutes a high projection, is shape. The joint between the upper and lower moldsections is the broken plane or surface 1 2 3 4 5 6. When the pattern is in two parts, as shown in Fig. 6, after removing the upper part of the mold and the upper part of the pattern the lower part of the pattern may be left in its mold, (instead of removing it and filling its place with different or separate material, as cotton-waste and sand, as described in connection with Figs. 3, 3, and 3 taking the place of a separate filling for the lower mold depression during the next step of the process. On the other hand, the lower part of the pattern, or the whole pattern, if it be of one piece, may be removed and a cotton-waste and sand filling be used. The intermediate conditions corresponding to those shown in Figs. 3 and 3 are not shown in connection with this form of pattern, being the same in 4 sections. principle as in Figs. 3 and 3", though difiering in form. When taken from the mold in either case illustrated, the stripping-plate'is complete and accurate. In some cases it is unnecessary to make the stripping-plate for the whole of the pattern, but only for its highest or most difficult parts; but the mode of making such stripping-plates would not diifer from that above described. I claim 1. The improvement in the art of making stripping-plates, consisting in making a mold of the parts of a pattern with which the stripping-plate is designed to be used in a moldsection b, filling the depressions of such sec tion, forming a mold-section c on section b so as to mark the shape of the depressions of the mold-section b on the bottom of section 0, removing section 0, cutting out sand from the bottom thereof to the depth of the thickness of stripping-plate desiredbut leaving uncut the parts corresponding in shape and location to the depressions in mold-section b, and casting stripping-plate e in the space between th 2. The improvement in the art of making stripping-plates for molds when separating them from patterns having high projections or parts, consisting in forming a mold of the pattern in a two-part mold in such manner that the high parts of the pattern extend from the plane of the joint between the mold-sections into one mold-section, the inner surface of said section being made to correspond to the inner end of the high part of the pattern, the low part of the pattern being placed on the opposite side of said plane, removing the mold-section having the impression of the low part of the pattern, removing the pattern, filling the depressions formed by the high projections with suitable material, forming a second mold-section on the section having the depressions for the high parts of the pattern so as to make the form of the depressions on the inner side of said second mold-section, removing the latter section, cutting out material from the inner side thereof to the thickness of the stripping-plate desired, but having projections corresponding in size and location to the cross-section of the high projections, placing said second section thus prepared on the section having depressions for the high projections, and casting the stripping-plate. Signed at Paris, France, this 7th day of October, 1899. ERNEST SAILLOT.

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