DE1239441B - Device mounted on a slidable slide for holding and guiding the pouring channel and socket core in centrifugal casting machines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B22d

German class: 31 b2- 13/02

Number: 1239 441

File number: H 28765 VT a / 31 b2

Filing date: May 5, 1955

Open date: April 27, 1967

The invention relates to a device mounted on a displaceable carriage for Holding and guiding the casting channel and socket core in centrifugal casting machines.

In such centrifugal casting machines, the casting material is poured into a rapidly rotating mold and by the centrifugal force until solidification in an amount corresponding to the amount of casting material Thickness held on the wall surface. The shape consists of a rotatable, in usually cylindrical molding box, which has a corresponding lining made of known molding materials, z. B. Molding sand mixes received. For compressing the molding sand poured into the molding box a mandrel is introduced which, when the mold is rotated, rolls like a roller over the mold surface and thereby causing the necessary compression.

As a result of the generally considerable length of the molding box, the mandrel must be in the working position be stored at its free end. This is done by a bearing-like support in which the mandrel is inserted.

Corresponding cores must be arranged for socket pipes.

It is known to design the cores so that the casting channel through the core into the interior of the mold can be introduced. Since the core must rotate with the mold, are in this known device however, relatively complicated arrangements are required, and the insertion of the core and the launder requires a considerable amount of time.

With the invention, the object is to be achieved to create a device with the pouring channel and Core inserted very quickly and easily, precisely fitting into the finished form and after completion of the casting can be pulled out again.

According to the invention, this is done in a centrifugal casting machine by a sliding one Device mounted on a slide for holding and guiding the pouring channel and socket core achieved that the carrier for the pouring channel and the core arranged around its outlet by a to Axis of rotation of the shape vertical axis is rotatable. With this arrangement, the core holder can be swiveled out and even heavy and sensitive cores can be put on quickly and easily.

The casting channel is preferably fixed on a carrier mounted and the core holder rotatably mounted on this carrier. This is how the launder is automatically in its operating position when the core holder is inserted after a tilting movement of the carrier.

Mounted on a sliding carriage
Device for holding and guiding
The pouring channel and socket core are included
Centrifugal casting machines

Applicant:

Herman Pneumatic Machine Company,

Pittsburgh, Pa. (V. St. A.)

Representative:

Dr. F. Zumstein

and DipL-Chem. Dr. rer. nat. E. Assmann,

Patent Attorneys, Munich 2, Bräuhausstr. 4th

Named as inventor:

John A. Lasater,

Thomas A. Deakins, Pittsburgh, Pa. (V. St. A.)

Claimed priority:

V. St. v. America May 5, 1954 (427 842) -

The device with a mandrel for solidifying which can be introduced from one end of the mold is advantageous the mold liner and a mandrel support device at the other end of the mold are formed so that bush, core holder and pouring channel attached to the carrier so that they can be moved into the working position are. This arrangement makes it possible by simple, revolver-like pivoting of the carrier to quickly bring either the mandrel support or the core holder into working position.

In the following the invention is explained in more detail with reference to the drawing of an exemplary embodiment, in which a section through this embodiment is shown, wherein the pouring channel and the assigned core holder are pivoted into the operating position.

The device according to the invention can be used in centrifugal casting machines which have a number of rotatable molding boxes in a cradle for the production of hollow, elongated parts, e.g. B. having pipes, the device after some changes can be used both for the production of single and double socket pipes.

The device according to the invention is in front of the rotatable molding boxes on a sliding one

709 577/282

Claims (3)

Sled and pivotable about an axis perpendicular to the axis of the molding box. The carrier 77, which is fastened to pegs, can rotate between two positions approximately 90 ° apart. In order to hold the carrier in each of these positions, locking devices are provided. In one of these positions a device for supporting the front end of the dome is arranged in alignment therewith on the support 77, and in the other position a pouring channel is located with its outlet approximately in alignment with the axis of the flask on the support 77. The support 77 is, as shown, generally hollow. The lower wall of the carrier in the drawing has circular openings which, after the carrier has been pivoted by 90 °, are essentially coaxial with the molding boxes. In each of these openings of the carrier 77, a bearing bush 79 is attached to the carrier 77 by any desired arrangement, not shown. In each bearing bush 79 bearings of any type, for. B. tapered roller bearings, which z. B. can be pressed into the bearing bush 79. A component sits in the inner bore of each of the bearings, the design of which is determined by whether a single socket pipe or a double socket pipe is to be cast. If single socket pipes are cast, it has the shape of a sleeve 81 with a flange, the flange serving as a protective wall against the ingress of molding materials. The bore of the sleeve 81, which forms a guide bearing for the mandrel, is dimensioned so that it can receive the mandrel cap while guiding tightly and securely during the molding process. When casting a double socket pipe, the sleeve 81 is replaced by a combination of the guide bearing with a hub 84. This combination can, as shown in the drawing, be formed in one piece or consist of two parts bolted to one another or fastened to one another in some other way. The hub 84 is designed so that the front part of the mandrel can be pushed into it when it is inserted into the molding box, so as to produce an expansion of the shape for the formation of the sleeve. The leading edge of the hub 84 is beveled and has a bore for receiving a sleeve. The rear part of the hub 84 is hollow and has openings through which the molded materials, which have been pushed into the hub from the end face of the dome, emerge as a result of the centrifugal force during the rotation of the dome and the hub. Furthermore, the carrier 77 has openings on the wall facing the molding boxes, the center points of which lie approximately in the vertical longitudinal planes passing through the axes of the molding boxes. Bead-shaped elevations 89 are provided on both sides of the openings, to which core holders are attached during the production of double socket pipes. When casting single hub tubes, the bead-shaped projections 89 are covered by cover plates. The core holder 91 is rotatably mounted on the carrier 77 and has a fastening device which consists of cylinders 92 lying parallel to one another at a distance. Each of the cylinders 92 per se has, in addition to a closed end, an open end surrounded by a flange. This flange is bolted to the corresponding bead-shaped projections 89 and thus fastened to the carrier 77. Each cylinder 92 has a piston with a very short stroke and a piston rod which protrudes from the open end of the cylinder through an opening and extends to a core holder mounting sleeve 98 in which the core holder 91 is mounted in bearings. Via a line, not shown, a medium under pressure, for example compressed air, is fed to the closed end of the cylinder 92, and the piston is acted upon so that it is under resilient pressure, whereby the core holder can easily yield when the core carried by it 102 is inserted into the mold box end and brought into contact with the mold formed in the box so as to prevent possible destruction of the core and / or the mold. To compensate for inaccuracies, an elastic intermediate layer, for. B. made of rubber, inserted. Casting chutes 100 are attached to the carrier 77 in such a way that a corresponding movement of the carrier 77 and of the carriage on which the carrier is mounted, their outlets are introduced into the corresponding molding boxes. The pouring gutters are attached to the carrier in such a way that the core holders 91 lie with the cores around the outlets of the pouring gutters when double socket pipes are being cast. Each core holder 91 is supported in the corresponding core holder mounting sleeve 98 so that it can rotate with the mold and the flask. The runners 100, on the other hand, are fixed while the molten material is poured into the rotating molds. Patent claims: 1. Device mounted on a displaceable slide for holding and guiding the pouring channel and socket core in centrifugal casting machines, characterized in that the carrier (77) for the pouring channel (100) and the core (102) arranged around its outlet about a to the axis of rotation of the mold vertical axis is rotatable. 2. Device according to spoke 1, characterized in that this pouring channel (100) is fixedly mounted on this carrier (77) and that the core holder (91) is rotatably mounted on this carrier (77). 3. Vorrichtnug according to claims 1 and 2 with an insertable from the end of the mold dome for solidifying the mold lining and a support device for the dome at the other end of the mold, characterized in that the sleeve (81), core holder (91) and pouring channel (100) are attached to the carrier (77) such that they can be moved into the working position. Considered publications:
German patent specifications No. 585 362, 846 279. Legacy Patents Considered:
German Patent No. 934 846. 1 sheet of drawings 709 577/282 4.67 © Bundesdruckerei Berlin