Patent Application
20210129212
The invention relates to a method for producing filter feeder intended to be inserted into a mold used in the casting of metals, wherein the filter body has a first, inner feeder volume and consists of an exothermic and/or insulating material, the feeder body having a lateral wall region and a bottom region that has a feeder opening for connecting the feeder volume to a casting cavity, and wherein a filter element is secured in the feeder body of the filter feeder.
The invention also relates to a device suitable for performing the method as well as a filter feeder.
The structure of a filter feeder to be manufactured using the invention is described in DE 20 2016 103 430 U1. If a filter feeder has to be handled during transport and/or preparation of the casting mold, for example if it is turned, there is a risk that the filter element, which, for reasons based on materials, already forms a separate component, will become detached from the feeder body during handling. In order to prevent this, DE 20 2016 103 430 U1 proposes to clamp the filter element by means of a paper sleeve in a receptacle designed to receive it on the feeder body.
In this respect, the disadvantage of this known solution is that not only a separate aid must be provided with the paper sleeve, but also that a separate step is required for the assembly of the finished filter feeder. This involves correspondingly high manufacturing costs.
The invention is therefore based on the object of simplifying the process of producing a filter feeder and also of providing a device suitable for carrying out a corresponding method.
The solution for this object is provided in advantageous embodiments of the invention which are the subject of the patent claims and which are described in this specification.
The basic idea of the invention is that, during the production of the filter feeder in a core shooting machine, the filter element is positioned on a king that projects into a mold cavity defining the shape of the feeder body in a shooting mold of the core shooting machine and forms the feeder volume of the finished filter feeder in such a way that, during the shooting of the filter feeder, the filter element is surrounded by the shot-in material and anchored in the material of the finished filter feeder during the shooting of the filter feeder.
In this respect, the invention has the advantage that the filter element is shot in during the production of the feeder body in a single process step, so that the filter element is firmly fixed to the feeder body from the start and no longer has to be fixed by means of a separate aid and in a separate operation.
A first example of the invention is the manufacture of a filter feeder, in which the filter element forms a cover opposite the bottom area of the feeder body. A filter feeder of this design results from the mentioned DE 20 2016 103 430 U1. To produce such a filter feeder, it is necessary that the filter element is placed on an upper end face of the king projecting into the mold cavity and fixed to it, and a shooting plate closing the mold cavity in the shooting mold holds the filter element against the king during the shooting of the material.
An alternative example of the invention is the design of a filter feeder in which the filter element forms the bottom area of the feeder body and at the same time also represents the feeder opening. Such a design is not known in the state of the art, so that this special design is also an object of invention in itself, especially in connection with a process suitable for its manufacture. This method provides for the filter element to be placed on a positioning plate fixed to a base plate, which defines the base area of the feeder body. The king is then placed with an end face on the inserted filter element, and the material is shot into the remaining mold cavity of the firing mold.
A device suitable for carrying out the manufacturing processes for the production of different filter feeder molds contemplates, in particular, a shooting mold forming part of a core shooting machine with a mold cavity formed therein that receives a king. At least two radially projecting ribs are arranged on the outside of the king and distributed over its outer circumference, the ribs projecting beyond the end face of the king that contacts the filter element and thereby at least partially outwardly surrounding the filter element positioned on the king and fixing it during the shooting of the material into the mold cavity of the closing mold. The remaining areas of the mold cavity which are not filled by the ribs surrounding the filter element on the outside are filled by the shot-in material during the shooting process, so that the shot-in material on the one hand forms the lateral wall area of the finished feeder body, but on the other hand also surrounds the filter element on its outside and thereby fixes it to the feeder body as a component of the lateral wall area.
In this connection, the ribs may have a crescent-shaped contour with an external curvature.
It can be useful if four ribs are arranged on the circumference of the king.
As far as the device being intended to carry out a manufacturing process for a filter feeder with a filter element forming a cover, it may be provided that the king is a component of a base plate of the shooting form which defines the bottom area of the feeder body.
As far as the manufacture of a filter feeder with a filter element forming its bottom area is concerned, the device can provide that on a base plate of the shooting mold, which defines the bottom area of the feeder body, a positioning plate is arranged which surrounds the filter element inserted into the mold cavity with an edge projecting up on its outer circumference.
Here it may be provided, in particular, that the king which can be inserted onto the filter element placed on the positioning plate is fixed to a shooting plate which closes the mold cavity of the shooting mold on the outside.
Alternatively, it may be provided that the king attachable to the filter element placed on the positioning plate is attached to a holding plate externally overlapping the mold cavity of the firing mold.
However, according to another example of the invention, it is also conceivable that the king that can be attached to the filter element placed on the positioning plate is a loose component fixed by a shooting plate or a holding plate placed on the outside of the mold cavity of the shooting mold.
The invention also relates to a filter feeder with a feeder body consisting of an exothermic and/or insulating material and having an inner feeder volume, the feeder body having a lateral wall lining.
A filter element is fixed in the feeder body of the filter feeder, wherein the filter element is at least partially embedded on its outer circumference in the material of the feeder body and is thereby directly anchored in the material of the finished filter feeder.
In particular, it is provided here that at least one rib is formed on the inside of the lateral wall region facing the feeder volume, projecting into the feeder volume, the rib bearing against the outer periphery of the filter element at the end face and clamping and fixing the filter element.
In alternative versions of the invention, it may be provided that the filter element is arranged in the upper region of the feeder body opposite the bottom region of the feeder body, or that the filter element is arranged in the bottom region of the feeder body.
In the drawings, embodiments of the invention are provided, which will be described below. In the drawings:
The finished feeder body 11 of a filter feeder 10, which can be seen in detail in
The feeder body 11 shot in a core shooter (not shown) has a filter element 16 that is shot in opposite to its bottom area 14 and thereby fixed in a manufacturing process.
Insofar as the production of the filter feeder 10 as described above is carried out in a known manner by shooting in a core shooting machine, the shape of the feeder body 11 is formed by a mold cavity 20 formed in a shooting mold 17 and a king 21 projecting into the mold cavity 20. Basically, such a mold 17 comprises a base plate 18 and a cylindrical outer casing 19, which encloses the inner mold cavity 20. In the example shown in
As is known to the practitioner with regard to such shooting molds 17, the mold cavity 20 is closed on its upper side opposite the base plate 18 by means of an upper box or a shooting plate of the core shooter. For reasons of simplification, this arrangement is not further shown in
As a filter element 16 is to be shot into the feeder body 11 in a manufacturing process with the shooting mold 17 shown in
As not shown further, the mold cavity 20 above the filter element 16 is closed by a shooting plate (not shown), which simultaneously holds the filter element 16 against the filter element 16 during the shooting process and thereby prevents movement of the filter element 16.
After demolding the finished filter feeder 10 from the shooting mold 17, the filter feeder 10 has the shape shown in
In the example shown in
As shown in the example in
Alternatively, it can be provided in accordance with
Finally, it is also contemplated that the king 21 is designed as a loose or separately manageable component which, after the insertion of the filter element 16, is inserted into the positioning plate 26 and subsequently fixed in a suitable manner in the mold cavity 20 of the shooting mold 17, for example by means of the shooting plate 31, a holding plate 34, or a holding device designed in another manner on an upper box of the shooting mold.
The features of the subject matter of these documents disclosed in the above description, the patent claims, the summary and the drawing may be essential, individually or in any combination, for the realization of the invention in its various forms.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2017/055322 | 3/7/2017 | WO | 00 |
