US800837A - Process of making thin plate. - Google Patents

Description

prion.

DANIEL M. SOMERS, on NEW YORK, N. Y.

PROCESS OF MAKIING THEN PLATE.

mxsoossz Specification of Letters Patent.

Patented ct. 3, 1905.

Application filed May 24. 1905. Serial No. 262-088- To all whom, it'may concern: I

Be it known that I, DANIEL M. SoMERs, a citizen of the United States, residing at New York, county of Kings, and State of New York, have invented certainnew and useful Improvements in Processes of Making Thin Plate, full y described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to an improved process for making thin platesuch, for instance, as the plate which is used as the basis for commercial tin-plate.

In the ordinary operation of making thin plate of the character referred to as it is now carried on the plate is produced by subjecting plate-bars to the proper heating and rolling operations until the desired gage of plate is reached. The plate is then pickled, the sheets subjected to the pickling process, ordinarily measuring about twenty by twenty-eight inches, the thickness varying according to the standard gage of plate to be produced. This pickling operation cleans the plate and removes the scale therefrom. After pickling the plate is annealed and then cold-rolled to surface it. The plate is then ready for the tinning process if it is to be made into tinplate or for other commercial uses.

The present invention has-for its object to reduce the cost of producing thin plate of the general character referred to and at the same time to improve the character of the product.

them to be subjected to subsequent reducing and elongating operations. The sheets treated will vary in size and thickness according to the size and gage of plate to be finally produced. If, for instance, plate which is to serve as a basis for commercial tin-plate'is to be produced,the pickled'plates referred to may conveniently be about twenty-eight by thirtysix inches and about one-sixteenth of an inch thick. These plates after being pickled are heated in asuitable furnace and are then sub jected to pressure, preferably by rolling them, by which they are reduced in thickness and elongated, the product thus produced being sheets fifteen feet long by twenty-eight inches wide and about .0116 of an inch in Y thickness, this being the thicknessof what is ing and subsequent operations will be carried on without permitting the plate to be acted upon by the air, thus preventing the formation of scale and the discoloration of the plate-that is, the product of the process is gray plate or what is commercially known as white plate, as distinguished from the black plate, which is the product of the 0rdinary heating and reducing operations,which black plate must be pickled to clean itand remove the scale therefrom. When the process is carried on in this way, very marked economies result over the ordinary commercial process. In the first place the amount of surface to be pickled is greatly reduced, thus largely reducing the cost of this operation. In the specific case above referred to the reduction amounts to four-fifths. In the next place a superior product is produced. In pickling very thin platethat is, the plate which has been reduced to standard gagethe acid pickling solution attacks the plate unevenly and in some places actually perforates it, so that the pickled product varies in grade. In making tin-plate this pickled plate is cold-rolled, which operation surfacesthe plate and removes to a certain extent the imperfections produced by pickling. A large number of these imperfections are, however, of such a character that they cannot be eliminated and cannot be detected until after the plate is tinned, so that a very considerable amount of what is known as wasters occurs in comniercialtinplate-that is, imperfect sheets which have to be rejected and sold at a low price. In fact, some of these imperfections-- as, for instance, in cases whdre the sheet is thinned along a line of some length, but not actually perforated-escape detection even after tinning and are discovered by the break ing of-the metal when it is attempted to put the sheets to commercial use; By pickling the sheets when they are comparatively thick and then subjecting them to theheating and pressure operations to reduce and elongate them the imperfections produced by pickling are, in the first place, not nearly so extensive and, in the second place, are to a great extent cured or removed by the subsequent operations.

It has been stated that when the process is carried out according to the best way the pickled plate will be subjected to the various operations without permitting it to come in cbntact with the air. lit may be further remarked that better and more economical results will be produced if the sheets of plate prior to heating and reducing are assembled in packs and if the sheets, whether assembled in packs or not, are after the final reducing operation annealed without being exposed to the air and without permitting them to be exposed to the air between the final reducing operation and the annealing operation.

While, as has been indicated, the best results will be effected when the steps of the process referred to are carried on without permitting the pickled plate to become exposed to the air during the operations re-' ferred to, fairly good results may be obtained 7 where the pickled plate is heated and elongated while exposed to .the 'air, this being particularly true where packs of plate are being operated upon. When the process is carried on in this manner, it will probably be necessary to pickle the outside sheets of the pack after elongation; but the inner sheets will in a large measurebe free from discoloration and scale.

Where especially high-grade product is desired, the pickled plate may be subjected to cold-rolling prior to the heating and subsequent operations. This cold-rolling will so rface the sheets, and the surface thus obtained will be preserved to a great extent during the subsequent operations.

While the improved process is not dependent upon any particular form of apparatus, the apparatus described in an application filed by me on March 28, 1904:, and serially numbered 199,831 is a suitable one for carrying it into eflect.

It will be obvious that the process described not only has the great advantage of enabling thin plate to be produced at a less cost than heretofore, but it has the further advantage of enabling a very superior article of plate to be produced.

While the improved process is particularly advantageous when used in the production of ations being carried on without exposing the plate to the action of the air, whereby formation of scale is prevented.

2. The process of making thin plate which consists in assembling previouslypickled sheets of plate in a pack, heating the pack, and then subjecting it to pressure to elongate the plate and reduce its thickness.

3. The process of making'thin plate which consists in assembling previously pickled sheets of plate in a pack, heating the pack and then subjecting it to pressure to elongate and reduce the plate in thickness, the heating and pressure operations being carried on without exposing the plate'to the action of the air.

4. The process of making thin plate which consists in cold rolling previously pickled plate, then heating the plate, andthen su bjecting it to pressure to elongate the plate and red uce its thickness, the heating and pressure operations being carried on without exposing the plate to the action of the air.

5. The process of making thin plate which consists in cold-rplling sheets of previouslypickled plate, assembling the sheets in a pack, heating the pack, and then subjecting the pack to pressure to elongate the plate and reduce the thickness.

6. The process of making thin plate which consists in cold-rolling sheets of previouslypickled plate, assembling the sheets in a pack, heating the pack, and then subjecting the pack to pressure to elongate the plate and reduce the thickness, the heating and pressure operations being carried on without exposing the plate to the action of the air.

7 The process of making thin plate which consists in heating previously-pickled plate, then subjecting it to pressure to elongate the plate and'reduce its thickness, and then annealing, these operations being carried on without exposing the plate to the action of the air.

8. The process of making thin plate which consists in heating previously -pickled plate, assembling the plate in a pack, subjecting the pack to pressure to elongate the plate and reduce its thickness, and then annealing", the heating, pressure and annealing operations being carried on without exposing the plate to the action of the air.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

- 'DANllEL M. SUMERS. Witnesses: Ansnsra Wnrrn,

- Janus Q. than.