Abstract: The invention relates to a method and the production of natural leathers from pieces of natural leather torn into different-sized fibers which are sorted and placed, once they have been mixed with a binder, in successive layers (6, 7 and 8) on a support sheet (9) provided with filaments crossing the different layers. The support sheet (9) and filaments (10) are extracted once the binder substance has cured.

Abstract: The present invention is directed to a shaft with two front sides and an axis of rotation, whereby the shaft comprises at least one gear with the same axis of rotation, which gear borders at least a first one of the front sides in an axial area. Viewed from radially inside toward radially outside, the gear comprises a connection part with a central receptacle for the shaft, and an outer part with teeth. The connection part is cast directly between the shaft and the outer part. The connection part extends over the shaft in axial direction and covers the first front side.

Abstract: In carrying out a cast-in process, a cast-in insert member is placed into a cast forming cavity in a casting mold, and a casting is conducted. The cast-in insert member has a barrier layer on its non-deposited surface for inhibiting the deposition of a molten metal. During casting, a portion of a molten metal is introduced to a heating chamber on the side of the barrier layer to come into contact with the barrier layer. Thus, the cast-in insert member can be heated not only from the side of its deposited surface, but also from the side of its non-deposited surface, thereby providing an enhanced strength of deposition of the cast-in insert member.

Abstract: Composite casting process for making castings, consisting in particular of light metal alloys reinforced by fiber or foamed material inserts, in particular motor parts such as pistons, cylinders, cylinder heads and motor blocks of internal combustion engines. In this process, firstly, a preform reinforced by the fiber or foamed material inserts is made by embedding and the penetration of a fiber bundle or a foamed material body in molten matrix metal or by a molten matrix metal and subsequently solidifying it. Then, the preform is immersed in a molten metal bath and subsequently inserted into a casting mould for integrally casting or casting around the final casting.

Abstract: The present invention relates to a novel method for forming metal matrix composite bodies. Particularly, a permeable mass of filler material is formed into a preform. An infiltration enhancer or an infiltration enhancer precursor or an infiltrating atmosphere are also in communication with the preform, at least at some point during the process, which permits molten matrix metal to spontaneously infiltrate the preform when the preform is placed into the molten matrix metal. A means for maintaining the preform at least partially below the surface of the molten matrix metal can also be utilized. In a preferred embodiment a reservoir may be employed to supply a second metal which has a different composition from the first source of matrix metal.

Abstract: The disclosed method forms a zinc sleeve on an insulator pin by dipping the insulator pin in molten zinc at about 450.degree.-650.degree. C. to heat and wet the insulator pin with the molten zinc, setting the hot and wetted insulator pin in a die having an open-top cavity in such a manner that an annular open-top molding cavity is defined around the insulator, the die being at about 50.degree.-300.degree. C. when receiving the insulator pin, pouring molten zinc in the annular molding cavity through its open top, and solidifying the zinc thus poured.

Abstract: A method of making a bearing composed of a bronze preform having aluminum or aluminum alloy cast thereabout. The method includes the step of placing the bronze preform in a mold so as to be supported at one end thereof. The bronze preform is formed of a bronze having lead with a determining melting point and boiling point. The method also includes the step of providing molten aluminum or aluminum alloy to be fed into the mold after the bronze preform has been placed therein. The molten aluminum or aluminum alloy is at a temperature between the melting point and boiling point of lead in the bronze of the bronze preform. The method further includes the step of feeding the molten aluminum or aluminum alloy into the mold under pressure after the bronze preform has been placed therein. The molten aluminum or aluminum alloy contacts the bronze preform and produces a molten lead during partial erosion of the surface thereof.

Abstract: This invention relates to an improvement in the process of mold welding two metal parts together having respective base sections, which includes enclosing the end sections of said metal parts in aligned end-to-end relation in a mold having an entrance gate, flowing molten metal through said entrance gate into said mold, and out of said mold at rates so related as to cause some of the metal admitted into the mold to be discharged from said mold while the rest of the molten metal accumulates as a metal bath to cause the molten metal during the early stage of its admission into the mold to preheat the metal parts, and conducting some of the said molten metal during said early stage from the entrance gate through a recess and directly onto said base sections in direct impingement with said base sections to promote better heat transfer between said molten metal and said metal parts, the improvement comprising discharging molten metal through at least two separate exit gates into separate discharge chambers located