DE1176322B - Horizontal centrifugal casting device - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Kl .: B22d

German class: 31c -18/02

Number: 1176 322

File number: H 23827 VI a / 31 c

Filing date: May 5, 1955

Opening day: August 20, 1964

The present invention relates to a horizontal centrifugal casting apparatus with a core holder that can be moved coaxially to the mold and that is mounted on a sliding Carriage is arranged and which carries the inserted into the mold core during casting.

In devices of this type, a fine-grained material forming the lining, for example Molding sand, introduced into a centrifugal casting mold. The casting material is poured into the mold, while the centrifugal mold rotates. The hollow cast body then solidifies during the rotation of the Centrifugal casting mold and is ejected from the centrifugal casting mold after solidification with the lining.

During the production of the lining, mandrels are inserted into the centrifugal casting mold Press on the material for the lining, with these mandrels supported at both ends in the working position and the molds rotate with the material forming the lining.

The device is for casting pipes that have a socket at one end and a socket at the other End having a counterpart or a sleeve at each end, suitable. In order to achieve the centrifugal casting of Pipes to form a socket, an expansion of the lining is necessary, in this expansion a core must be used. When the core is inserted into this extension of the lining is, a shoulder-shaped shoulder of this core lies on a corresponding shoulder of the lining at. It is of great importance that the core is properly seated in the liner, and it is essential that that when the core is retracted, neither the lining nor the core itself are damaged can.

Centrifugal casting machines are known in which the cores are inserted by hand. With these Machines, the problem of core and / or mold damage is of little concern, since the damage can easily be avoided by carefully working the operator can be.

The invention is directed to centrifugal casters in which the core is mechanically inserted will. With these machines it is not only of great importance that the core is exactly in the shape sits, but also when inserting neither the form nor the core itself is damaged. It is a major shortcoming of known machines that frequent core and / or mold damage autfreten. According to the invention, this deficiency is eliminated.

Horizontal centrifugal casting device

Applicant:

Herman Pneumatic Machine Company,

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

Representative:

Dr. F. Zumstein, patent attorney,

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)

According to the invention, the risk of damage to the lining or the core is reduced by that there is little movement between the core holder when the core engages the mold and damping device enabling the carriage is arranged.

The core holder is rotatably mounted on a core holder carrier, so that the core holder during of casting can rotate with the mold. Because the core holder and the lining of the centrifugal mold be assembled before casting, it may happen that the axis of the core and which are not exactly in line with the lining. To ensure proper sealing of the lining to ensure the core and to prevent damage to the core and the lining, if the core and liner are not positioned exactly coaxially with each other during casting are, according to the invention, an elastic intermediate piece between the core holder and the Core arranged.

The device according to the invention reduces the proportion of rejects and thus the production costs reduced.

With reference to the figures, which represent an embodiment according to the invention, this is to be explained in more detail will.

409 657/340

Fig. 1 shows a plan view and partially a horizontal cross section of a centrifugal casting device, in which the invention can be used to advantage. The device is particularly useful for casting of pipes having a socket at one end and a socket at each end, respectively;

FIG. 2 shows a side view of the one shown in FIG Contraption;

Fig. 3 shows the 90 ° pivotable bearing for the front end of a mandrel with which the Linings of the centrifugal casting molds are pressed and the core support and the core and the Casting mold, with the bearing for the front end of the mandrel in the operating position and the pouring spout and the core holder are out of service.

F i g. 4 shows the same elements as those in FIG. 3 are shown, but here the core holder and the core and the pouring spout are shown in the operating position, whereas the bearing for the mandrel is pivoted out of the operating position.

In order to explain the operation of the device according to the invention in more detail, the casting a socket pipe is described below: - At the end of a work step there are molds 16 in a vertical position and are open on both sides to remove the finished pipes. After that will be the lower ends of the molds are closed by the closures 44. In the closed molds finely divided material forming the lining is poured in. After filling, the Tube cradle carrier 7 pivoted so that the centrifugal casting molds 16 after pivoting in the horizontal position. At the same time, the centrifugal casting molds are set in rotation and the material forming the lining is thrown against the walls of the molds by this rotation. After the centrifugal casting chills 16 have assumed the horizontal position, the closures 44 opened and the mandrels 25 from right to left (see FIGS. 1 and 2) through the molds pushed through. At the same time the carriage 69 with the carrier 77 is moving from left to right to the openings the centrifugal casting molds advanced and the ends of the mandrels 25 thereby in their guide bearings 81 inserted. The cradle 11 is then about the axis 8 at a small angle to both Pages pivoted and under this movement of the cradle 11 and the rotation of the centrifugal casting molds 16, the material present in the molds is removed from the mandrels with the supply of liquid 25 pressed against the mold walls, shaped and smoothed, while it solidifies at the same time. As a result the extension 84 of the mandrel bearing 86, which is located on the carrier 77 and the extension on opposite end of the mandrels, the extensions at the ends of the linings form in which the cores are inserted during the casting process.

After the lining has been completed, the pipe cradle is moved into its basic position and the mandrels 25 are withdrawn. At the same time, the carriage 69 is moving to the left (in Figs. 1 and 2). The carrier 77 is in the form shown in FIG. 4 is pivoted and the carriage 69 is then moved again towards the mouth of the mold until it is stopped by the screws 74. As a result, the core 102 fastened on the core holder carrier 91 is pushed into the mold until the core engages the liner at point 104. In the same way, the core 53 α is introduced into the mold from the other side of the mold by the mechanism already described above.

By means of the pan 103, a certain amount of molten material is poured into the pouring spout 100 poured the mold. The molten material is thrown on it until it is in the ίο the shape has solidified. The core holders 91 are then pulled out of both molds and the mold 16 brought with the finished cast by pivoting the cradle carrier 11 in the vertical position. Then the casting, including the lining, is removed from the centrifugal casting mold by means not shown pushed out.

The core holders 91 can be pivoted through 90 ° on the carrier 77, the openings of the centrifugal casting molds 16 opposite each other. According to the invention, each of the core holders 91 has a holder in the form a damping device consisting of two cylinders 92 which are parallel to each other and in are arranged at a distance from one another, as shown in FIG. Each of these cylinders 92 has

as a closed end 93 and an open end on which the latter is bordered by a flange 94 (FIG. 4). This flange 94 is with the approaches 89 bolted, whereby the cylinder 92 is fastened on the carrier 77. Each of the cylinders 92 has a piston 95 which, as shown in FIG. 1, is only displaceable by a small stroke. With Each piston 95 is connected to a piston rod 96 which protrudes from the open end 97 of the cylinder 92 and is screwed to a fastening sleeve 98. In this core holder mounting sleeve 98, the core holder 91 is rotatably supported in bearings 105. The screw connection of the ends of the piston rods 96 takes place, as shown in FIG. 1, by means of nuts 99. In the piston chamber of the cylinder 92 air is introduced under pressure, so that the piston 95 is under resilient pressure. The purpose this damping device for the core holder is to enable it to yield easily when the cores 102 carried by the core holders 91 are inserted into the ends of the centrifugal molds 16 and come into contact with the lining. This will damage the cores and / or the lining largely prevented. Such damage has occurred, for example, when the core holders were rigidly attached to their supports.

The core holder 91 and the core 102 rotate with the lining of FIG Centrifugal casting mold 16 with, as the core holder 91 rotates in a bearing 105 in the core holder mounting sleeve 98 is stored. The pouring funnels 100 naturally do not rotate with it, but remain solid, while the liquid casting metal is poured through them into the mold.

Preferably, there is an annular elastic between each of the core holders 91 and the core Intermediate piece 101, e.g. B. od rubber. Like. To a slight discrepancy that may occur compensate for the coaxial alignment of the axis of rotation of the core 102 and the mold during casting to be able to. In order to stop the carrier 77 after the respective rotary movement, corresponding, Devices not shown provided. as well

the movement of the core carrier 77 arranged on the carriage 69 towards the mold 16 is controlled by retaining screws 74 (Fig. 1) stopped. The screws 74 are adjusted to control the movement of the carriage 69, on which the core holder carrier is mounted, stop when the core holder 91 or the bearing is located 86 for the ends of the mandrels 25 when pressing the lining in a correct operating position relative to the centrifugal casting molds 16 are located.

IO

Claims (3)

Patent claims: 1. Horizontal centrifugal casting device with a core holder that can be moved coaxially to the mold, which is arranged on a movable carriage and which is in the during casting Form inserted core carries, characterized by an engagement of the core (102) with the mold (16) a slight movement between the core holder (91) and the carriage (69) enabling damping device (92). 2. Apparatus according to claim 1, characterized by one when the engagement of the Core holder (91) carried core (102) with the mold (16) before stopping the retraction movement of the carriage (69) by stopping means (74) coming into effect damping device (92). 3. Apparatus according to claim 1 or 2, characterized in that an elastic intermediate piece (101) is arranged between the core holder and the core. 1 sheet of drawings 409 657/340 8.64 © Bundesdruckerei Berlin