DE35597C - Innovation in the manufacture of corrugated fire tubes made of cast steel - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 49: Mechanical metalworking.

Patented in the German Empire on September 17, 1885.

For present purposes it is desirable that the steel be uniform throughout and fills the whole mold. These conditions are more significant for castings Strength easy to achieve; in the case of comparatively thin Gufs, the steel decreases but very slightly solid form before all parts of the form are filled, whereby imperfect castings arise.

These difficulties are caused by heating the molds as well as keeping them hot during the Giefs overcome. The shapes can be in sand or other suitable material Can be made in matching boxes, or they can be made of refractory bricks or solid refractory material, which by means of a coating or by means of tires is held together. Finally, the forms can also be completely or partially be made of cast steel or cast iron, the surfaces of which are coated with graphite be provided.

When the mold is ready, it is placed in an oven and heated to the melting point of the steel respectively. heated as close to this temperature as permissible without affecting the shape or to damage the frame of the same or the tires. .Is the shape made of refractory Made of material, the interior of the same can be made by introducing rays or Streams of burning gases are heated. The molten steel is heated during the heating poured into the mold, and heating continued until all parts of the mold were filled with steel.

The process of compressing molten steel by means of hydraulic apparatus for the purpose of compression Compaction of the metal can also be used here if one has tubes of want to produce the best quality.

The fire-tubes are cast of such strength and size that they can be cast without any further Treatment for making kettles can be applied, or it will die The walls of the fire tubes are somewhat thicker and in different dimensions than the finished product cast, e.g. B. the waves are about a third deeper than in the finished product and the outer surface by about a quarter of the height of each corrugation parallel to the axis of the pipe made.

The fire pipe thus cast is now rolled and compacted in such a way that the dimensions exactly right. Machines of the type shown in Figures 1 and 2 of the accompanying drawings are used for rolling are shown.

There are first used two rollers 3 and 4, which are in suitable carriers or Racks 5, 6 and suitable bearings rest.

The frame 5 has a bearing for receiving the legs of the rollers and an adjusting screw to determine the distance between the rollers. The other frame 6 with the bearing and the adjusting device for the upper roller is in the same way as set up at the frame 5 and is available with the movable bearing 7 for the legs of the lower roller 4, which acts on the inner surface of the tube, in connection. This part is flexible to allow this to happen

Claims (1)

• rolling fire tube is brought onto roller 4 and removed therefrom. The movable part 7 is in the form of an ordinary pillow block with a base plate 8 produced and moves on the main base plate 9 of the machine. A part of the base plate protrudes outward beyond the end of the frame, so that the movable part 7 can be pulled out sufficiently to permit insertion and removal to allow the fire pipes. If the movable part is in its working position in the Frame 6 moved, so the same is held by two spindles 10, which in addition in the frame 6 attached rag and provided with handles 11 for turning the same are. The opposite ends of the spindles are provided with inclined surfaces, which engage the protruding surfaces of the plate 8 of the movable part 7 in a wedge-like manner. According to Fig. 1, the fire tube 12 is in the Shown size, which has the same when inserted into the machine, while the The size of the finished fire tube is indicated by the dotted circles. The two rollers work against each other, one on the outer one, the other on the inner surface of the fire tube 12. A third roller acts on the outer surface of the fire tube 12 and can be adjusted in such a way that it approaches the cylinder 4 or moves away from it the same can be removed, namely the dimensions and shape of the finished Fire tube 13 accordingly, and so that this by the action of the rollers 3 and 4 The fire tube made to rotate comes into contact with the roller 14 in such a way that it comes into contact with it gets the right curvature. The journals of this third roller 14 are mounted in parts, which are mounted in an inclined position in the frames 5, 6 and by means of screw spindles be adjusted. These spindles each have a helical gear 15 at the outer end which is provided with the screw spindle 16 provided with a handwheel 17 in engagement. If required, a fourth roller similar to roller 14 can also be attached to give the fire tube the required curvature. The third roller 14 respectively the third and fourth roll can be according to the dimensions of the finished raw material or they can first be put more inward and then gradually the Expansion of the pipe by rolling it accordingly moved outwards will. , Patenτ claim: The production of corrugated cast steel fire crusts for boilers etc. by casting in cast molds that can be heated from the outside and subsequent rolling out of the cast bodies in special roller mills. ', For this purpose ι sheet of drawings.