DE1144881B - Blowing or shooting machine for filling molding or core boxes with molding or core sand using compressed air - Google Patents

Description

<\ 31st VS H 1.

NOTICE THE REGISTRATION AND ISSUE OF EDITORIAL i

MARCH 7, 1963

The invention relates to blow molding or shooting machines for filling molding or core boxes with molding or. Core sand using compressed air; it is primarily concerned with foundry machinery, but it can also be used in other areas of work with similar manufacturing methods, e.g. B. for production of ceramic moldings or stone blanks.

In such machines, it is known that the sand column located in an insert container in an axial and / or in the radial direction through interruptions in the wall of the insert container Pressurize compressed air. The walls of the known insert containers are for this purpose with holes or Provide guards through which the compressed air acts on the sand column.

So that the sand column located in the insert container is as uniform as possible with the circumference pressurized air passing through the lateral openings of the insert container must be applied Many holes or slots are incorporated into the wall of the insert container. This is the manufacture of such an insert container is complicated and expensive. Another disadvantage is that the holes or slots have a certain hole diameter or a certain diameter for manufacturing reasons Must have slot width. This allows after the molding material has been filled into the box the dust-like parts of the molding material destroy the outflow paths of the exhaust air. A special However, the disadvantage of this known insert container is that the machines equipped with them only are suitable for processing relatively free-flowing sands. In the foundry, however, it is important To be able to process sand that is as stiff as possible and, in particular, croning sand mixtures, what with the known insert containers was only possible in special cases and with difficulties.

The object of the invention is to produce an insert container while avoiding the disadvantages indicated for blow molding and molding machines to simplify and cheaper, as well as its possible uses improve even for the stiffest sands.

To solve this problem it is proposed according to the invention that the insert container from an air-permeable, porous material.

Conveying devices for powdery and fine-grained material, in which compressed air through porous Walls is introduced through into the material to be conveyed, have long been known without that the skilled person the above-mentioned inventive solution to the problem that has existed for just as long Workability as stiff as possible he would have found sand.

Blowing or shooting machine

for filling molding or core boxes

with molding or core sand using compressed air

Applicant:

Rheinische Maschinenfabrik

and iron foundry Anton Röper Korn.-Ges.,

Dülken (RhId.)

Dr.-Ing. Heinrich Eyckeler, Dülken (RhId.),
has been named as the inventor

The following are particularly suitable as porous material for the production of this insert container:

a) sintered materials, such as. B. sintered iron, sintered bronze or sintered nickel alloys,
b) porous plastics,

c) ceramic materials,

d) ceramic materials that are made particularly porous by gas-forming agents or burn-out materials.

The use of a porous material not only makes the insert container cheaper to manufacture allows, but it is achieved at the same time that the compressed air almost at every point of the Insert wall penetrates so that the compressed air evenly on the entire surface of the sand column attacks, whereby the wall friction of the sand column going down is eliminated in an ideal way. In the case of the insert container according to the invention, it can be advantageous to improve the air permeability of the insert wall to be kept differently small over the circumference and / or over the height. That can be done once achieved by different wall thicknesses in different parts of the wall of the insert container on the other hand, by using a sintered material with changing porosity. The porosity of a sintered material can be determined in a known manner by the grain size of the starting material, possibly also adjusted by pressure and temperature during manufacture.

It has proven to be useful to increase the air permeability in the lower area of the insert container to be chosen smaller than in the upper area.

309 538/115

The insert container according to the invention can be in its air permeability can be easily adapted to the most varied of operational requirements. On special Devices for guiding the compressed air, such as a distributor ring, baffle plates or guide plates, can be dispensed with will.

In the drawing, an embodiment of the insert container according to the invention is in the upper part of a known sand shooting machine shown in vertical section.

At its upper end, the machine stand 1 has a head part 2, which acts as a compressed air chamber 3 is formed and on which a cylinder jacket 4 is cast is. The cylinder jacket 4 carries at its lower end an exchangeable shooting head 5, in which a nozzle 6 is used. Above the nozzle 6 and within the cylinder jacket 4 is known per se Way an insert container 7 is arranged, which according to the invention consists of an air-permeable, porous Material. An annular space 8 is formed by the inner wall of the cylinder jacket 4 and the outer wall of the insert container 7, which is connected to the compressed air chamber 3 via a shot valve 9. One inserted in the cylinder jacket 4 Distribution ring 10 is used to guide the compressed air. The insert container 7 is at its upper end in a Plate 11 is inserted centered on which a locking slide 12 is mounted. The locking slide 12 closes the insert container 7 airtight at the top. With slide 12 open (position shown) molding sand from a sand storage container 13 can be poured into the insert container 7.

The machine works as follows: After the insert container 7 is filled with molding sand and through the Slide 12 is hermetically sealed at the top, the compressed air required for a shooting process is which is stored in the compressed air chamber 3, via the shot valve 9 abruptly into the annular space 8. As a result, the column of sand filled in the insert container 7 is separated from it by the porous wall of the insert container 7 penetrating compressed air around something compressed and from that on Air pressure acting on the upper end face of the sand column through the nozzle 6 into an underlying one Butted molding box.

Claims (8)

PATENT CLAIMS: 1. Blow molding or shooting machine for filling molding or core boxes with molding or core sand by means of compressed air, in which the sand column located in an insert container is subjected to compressed air in the axial and / or radial direction through interruptions in the wall of the insert container , characterized in that the insert container (7) consists of an air-permeable, porous material. 2. Insert container for the machine according to claim 1, characterized in that the air-permeable, porous material is a sintered metal. 3. Insert container for the machine according to claim 1, characterized in that the air-permeable, porous material is a porous plastic. 4. Insert container for the machine according to claim 1, characterized in that the air-permeable porous material is a ceramic material. 5. Insert container for the machine according to claim 1, characterized in that the air-permeable porous material is a ceramic substance that is created by gas formers or burn-out substances is made particularly porous. 6. Insert container according to claim 2 to 5, characterized in that the air permeability the wall over the circumference and / or over the height kept different and z. B. is smaller in the lower area than in the upper area. 7. Insert container according to claim 2 to 6, characterized in that the air permeability the wall is set by the wall thickness. 8. Insert container according to claim 2 to 6, characterized in that the air permeability the wall adjusted by using a sintered material with changing porosity is. Considered publications:
German patent specification No. 764 638. 1 sheet of drawings © 309 538/115?.