U.S. patent application number 15/169431 was filed with the patent office on 2016-12-01 for method and device for making a casting mold having at least one lateral feeder system.
The applicant listed for this patent is GTP Schaefer Giesstechnische Produkte GmbH. Invention is credited to Joerg Schaefer, Thomas Schaefer.
Application Number | 20160346832 15/169431 |
Document ID | / |
Family ID | 56080324 |
Filed Date | 2016-12-01 |
United States Patent
Application |
20160346832 |
Kind Code |
A1 |
Schaefer; Joerg ; et
al. |
December 1, 2016 |
Method and Device for Making a Casting Mold Having at Least One
Lateral Feeder System
Abstract
A method for making casting molds includes the steps of
providing a casting model (10) that forms a mold cavity of the
casting mold, and positioning at least one lateral feeder system
(11) at the casting model (10) or mold cavity. The lateral feeder
system (11) has a feeder (12) forming an inner feeder cavity (13)
and a feeder cage (14) having a connecting channel (15) to the
casting model (10) or the mold cavity. A frame (16) made from a
heat-resistant material is mounted in the casting mold between an
end of the connecting channel (15) on a casting model-side and the
casting model (10) or the mold cavity, the frame (16) having a
netlike web mounted and fixed therein. The netlike web is made of a
fireproof material and has a through-hole.
Inventors: |
Schaefer; Joerg; (Koeln,
DE) ; Schaefer; Thomas; (Frechen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GTP Schaefer Giesstechnische Produkte GmbH |
Grevenbroich |
|
DE |
|
|
Family ID: |
56080324 |
Appl. No.: |
15/169431 |
Filed: |
May 31, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B22C 9/084 20130101;
B22C 9/088 20130101; B22C 9/02 20130101 |
International
Class: |
B22C 9/08 20060101
B22C009/08; B22C 9/02 20060101 B22C009/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 1, 2015 |
DE |
102015108656.5 |
Claims
1. A method for making casting molds, comprising: providing a
casting model (10) that forms a mold cavity of the casting mold;
positioning at least one lateral feeder system (11) at the casting
model (10) or mold cavity, wherein the lateral feeder system (11)
has a feeder (12) forming an inner feeder cavity (13) and a feeder
cage (14) having a connecting channel (15) to the casting model
(10) or the mold cavity, wherein a primary axis of the connecting
channel (15) runs at an angle to a primary axis of the feeder (12);
mounting a frame (16) made from a heat-resistant material in the
casting mold between an end of the connecting channel (15) on a
casting model-side and the casting model (10) or the mold cavity,
the frame (16) having a net-like web mounted and fixed therein, the
netlike web comprising a fireproof material and having a
through-hole.
2. The method according to claim 1, further comprising commonly
casting the frame (16) with the lateral feeder system (11) before
forming the casting mold by molding of the casting model (10) on a
model plate (19) supporting the casting model on which the casting
model (10) is positioned and upon making of the casting mold
commonly with the casting model (10) and the lateral feeder system
(11).
3. The method according to claim 1, in which upon making the
casting mold by common casting of the casting model (10) with the
lateral feeder system (11) positioned thereon, a recess is formed
for subsequent insertion of the frame (16).
4. The method according to claim 1, in which upon making of the
casting mold by casting of the casting model (10) respective, a
recess for subsequent insertion of the lateral feeder system (11)
and frame (16) is formed.
5. A frame with a netlike web made of a fireproof material and
having a through-hold tensioned therein for performing the method
of claim 1, wherein the frame (16) has a conical, tapered contour
and wherein the netlike web is fixed to the tapered side of the
frame (16).
6. The frame according to claim 5, wherein the frame (16) comprises
two partial frames (24, 26) oppositely moveable relative to one
another, wherein the two partial frames (24, 26) are attachable to
one another after application of a required tensioning of the
netlike web.
7. The frame according to claim 5, wherein the through-hold formed
in the netlike web has smaller dimensions than a cross section of
the connecting channel (15) formed in a feeder lower section
(14).
8. The frame according to claim 5, wherein the through-hold is
disposed centrally in the frame (16) and based on the positioning
of the frame (16), is positioned centrally in the connecting
channel (15) of the feeder cage (14).
9. The frame according to claim 5, wherein the frame (16) comprises
a metallic material.
10. The frame according to claim 5, wherein the frame (16)
comprises a ceramic material.
11. The frame according to claim 5, wherein the frame (16)
comprises a fireproof material.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The instant application claims the priority date of Jun. 1,
2015, the filing date of the German patent application DE 10 2015
108 656.5.
BACKGROUND OF THE INVENTION
[0002] The invention relates to a method for making casting molds
with a casting model forming the mold cavity of the casting mold
and at least one lateral feeding system positioned on the casting
model, whereby the lateral feeding system has a feeder forming a
feeder cavity and a feeder cage having a connecting channel to the
casting model or the mold cavity, and the primary axis of the
connecting channel runs at an angle to the primary axis of the
feeder, as well as a device for performing the method in the form
of a frame comprising a heat-resistant material with a net-like web
tensioned therein.
[0003] In foundry technology, it is often necessary to provide
additional feeders in the casting molds, which fill with the liquid
metal during casting of the casting piece and compensate for volume
deficits occurring during solidification of the casting piece in
order to prevent cavitation shrink holes in the casting piece.
Thus, the feeder must be made, such that the liquid metal fed into
it solidifies later than the casting piece, so that during the
solidification process, a material transport to the casting piece
can occur, which seals the casting piece. In this connection, the
feeders comprise an exothermic and/or insulating material or are
formed as so-called natural sand feeders in the mold sand
surrounding the casting model. In the frame of known methods for
manufacturing casting molds provided with feeders, the feeders with
any geometric shape is arranged at the position to be fed of the
later casting piece on the casting model and with the formation of
the casting mold by sealing of the mold sand that is introduced are
strongly molded or formed. With another method, during forming of
the casting model by means of the casting sand, cavities are
produced, in which individual feeders made of an exothermic and/or
insulating material are later provided and in this manner are
connected to the mold cavity formed by the demolding of the casting
model. In this manner, the feeders are arranged in the so-called
head feeder, which are arranged on the casting model surface or the
later casting part, and in the so-called lateral feeders different
cavities are positioned, which differ for example based on the
inaccessibility from upper feeding points laterally to the casting
model or are formed later, and in this regard, have a feeder formed
by an inner feeder cavity and a feeder cage having a connecting
channel to the casting model, whereby the primary axis of the
connecting channel runs at an angle to the primary axis of the
feeder. This feeder cage is formed during creation of the casting
mold by means of a corresponding model in the mold sand of the
casting mold or comprises likewise a specific mold part made from
an exothermic and/or insulating material. This type of lateral
feeder system is known, for example, from DE 84 18 911.8 U1.
[0004] When using feeders, generally the problem exists that after
the casting, solidified casting material in the form of so-called
feeder residue remains in the feeders, which after demolding of the
casting piece must be removed. Since the cleaning costs connected
to this process can be substantial, different proposals have been
made to form predetermined breaking points in the connection
between the feeder and the casting piece in the form of
restrictions or edges, where the feeder residue can be broken out
of otherwise removed as close as possible to the surface of the
casting piece. In particular, lateral feeding systems, however,
must provide greater connections to the mold cavity or the later
casting piece based on the prevailing thermal conditions, so that
for removal of the corresponding feeder residue with lateral feeder
systems, often heavy machines such as saws, angle grinders or
hydraulic shears must be used.
[0005] For producing the desired predetermined breaking points, it
is known to mount a web made of a fireproof material in the flow
path of the metal flowing curing casting, which, on the one hand,
permits the entry of the flowing metal into the feeder cavity or
back out into the mold cavity, and on the other hand, based on the
washing of the net structure through the hot metal after the
solidification of the casting part, forms a metal layer that
interfuses with the web and thus produces a defined material
weakening, whereby a knocking off of the remaining feeder residue
occurs over the web layer. In this regard, with head feeders, it is
known to arrange the netlike web to a breaking core mounted on the
head feeder.
[0006] With lateral feeder systems, generally the netlike webs are
anchored between the actual lateral feeder system and the casting
model or the mold cavity in the shaped mold sand. This is similar
to the use of netlike webs in a running system provided on a
finished casting mold for guiding the liquid metal to different
casting openings of the casting mold. However, one disadvantage
with this method is that the mold sand in the direct vicinity of
the casting model has insufficient strength, in order to hold the
netlike web with the required tension; thus, the netlike web with
the arrangement of the lateral feeder system in the casting mold is
provided at a greater distance to the casting model. This results,
however, in a greater amount of feeder residue on the casting part,
which in turn, requires expensive cleaning processes to
resolve.
SUMMARY OF THE INVENTION
[0007] The invention therefore is based on the object of providing
a method and a suitable device for performing the method, which
with the use of lateral feeder systems in the manufacture of
casting mold reduces the occurrence of remaining metal residue
after casting on the casting piece and which must be removed with
cleaning processes.
[0008] The invention contemplates a method in which a frame made up
of a heat-resistant material with a netlike web tensioned therein
is secured between the casting model-side end of the connection
channel and the casting model, the net-like web comprising a
fireproof material and having a through-hole.
[0009] An advantage of the present invention is that, based on the
netlike web tensioned in the frame, this frame can be positioned in
direct vicinity of the casting model for the mold cavity and is
made as a specialized component during the manufacture of the
casting mold in a reliably process and commonly with the formation
of the lateral feeder system. In so far as a sufficient tensioning
of the netlike web in the flow path can be ensured, the web, during
the flow through with the liquid metal during the casting process
is not pulled into the mold cavity and therewith, into the casting
part structure. The arrangement of the frame enables a tensioning
and holding of the netlike web in the frame independently of the
strength of the mold sand at the positioning point of the netlike
web. The use of a frame made from a heat-resistant material for
holding the tensioned netlike web offers the advantage that the
frame is not melted by the hot metal flowing through the casting
mold and therefore, no dangerous combustion gases exists for the
casting process.
[0010] According to one exemplary embodiment of the invention,
according to known method technology, it can be provided that the
frame is positioned together with the lateral feeder system on the
casting model before formation of the casting mold by molding of
the casting model on a model plate supporting the casting model and
is formed or molded together with the casting model and the lateral
feeder system during formation of the casting mold. Alternatively,
during formation of the casting mold by common formation of the
casting model with the lateral feeder system position thereon, a
recess for later insertion of the frame is formed. In turn, it can
alternatively be provided that during formation of the casting mold
by molding of the casting model, respectively, a recess for later
insertion of the lateral feeder system and frame is formed.
[0011] A frame suitable for use with the method of the present
invention with a netlike web tensioned herein that is made from a
fireproof material and which has a through-hole, according to one
embodiment of the present invention, has a conical, tapers shape,
whereby the netlike web is secured to the taper side of the frame.
In this manner the netlike web, during the positioning of the
frame, can be position very close to the casting model contour,
while the frame part having broadened side of the frame can be used
for fixing the frame in the casting mold.
[0012] According to an embodiment of the present invention, it is
advantageous if the frame comprises two oppositely moveable partial
frames, which can be secured together after the required tensioning
of the netlike web is achieved.
[0013] With regard to the through-hole formed in the netlike web,
it can be provided that this through-hold has a smaller dimension
as the cross section of the connecting channel located in the
feeder bottom part. According to an embodiment of the invention, it
can be provided that the through-hole has a surface of 10 to 50% of
the surface of the connecting channel enclosed by the frame,
whereby the net width, which means, the width of the net opening is
1 to 22 mm with a width of the fibers forming the net structure of
1 to 15 mm.
[0014] According to one embodiment of the invention, the
through-hold is arranged centrally in the frame and based on the
positioning of the frame, is positioned centrally in the connecting
channel of the feeder cage.
[0015] According to an embodiment of the invention, the frame can
be made of a metallic, ceramic, or a fireproof or heat resistant
material.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In the drawings, an exemplary embodiment of the present
invention is provided, which will be described in greater detail
below. In the drawings:
[0017] FIG. 1 shows the arrangement of a casting model, a frame
with a netlike web, and a lateral feeder system in a schematic,
exploded view;
[0018] FIG. 2 shows a first partial frame of the frame in a detail
view;
[0019] FIG. 3 shows a second partial frame of the frame in a detail
view; and
[0020] FIG. 4 shows the frame according to FIG. 1 comprising the
first and second partial frames.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] FIG. 1 shows only the schematic arrangement of the parts to
be placed into a molding box, which is divided if necessary, for a
casting mold to be manufactured, such as a casting model 10,
lateral feeder system 11, and frame 16 that holds a netlike web
(not shown). The above-noted arrangement is placed onto a pattern
plate 19. In the frame of making a casting mold, the above-noted
parts are arranged in their technically requirement arrangement to
one another either in the molding box and are formed or molded by
filling of the molding box or the molding box halves with molding
sand, or the casting model is merely formed in the molding box,
whereby by means of corresponding additional mold parts, recesses
in the mold sand are made, in which subsequently, the frame and the
lateral feeder system are disposed.
[0022] As shown further in FIG. 1, the lateral storage system 11
comprises a feeder 12 having an inner feeder cavity 13 and a feeder
cage 14 having a connecting channel 15, which is arranged with its
connecting channel 15 such that a connection between the mold
cavity, which exists after removal of the casting model 10 from the
molding box (not further shown) and during casting is to be filled
with hot metal and the inner feeder cavity 13 of the feeder 12 is
provided. In the flow path between the mold cavity and the
connecting channel 15 of the feeder cage 14, the frame 16 is
arranged with the netlike web held by it in a tensioned manner. The
web has a through-hold as a passage for the hot metal flowing
through the connecting channel 15 of the feeder cage 14. The frame
16 is arranged, therefore, as close as possible to the casting
model 10 or the mold cavity produced thereby, which is supported by
the conical, tapered contour of the frame, insofar as the tapered
side of the frame 16 is facing the casting model 10 or the mold
cavity and the netlike web is secured on the taper side of the
frame 16.
[0023] Insofar as the frame should comprise a heat-resistant
material, the frame can comprise a metal, ceramic, or a flameproof
material.
[0024] In FIGS. 2 through 4, a frame 16 comprising two partial
frames 24, 26 is shown, however, without the netlike web to be held
within the frame 16. FIG. 2 shows the first partial frame 24, which
forms the outer partial frame of the two-part frame 16. FIG. 3
shows the second partial frame 26, which is identical in
construction with the first partial frame 24, but which is
dimensioned such that the second partial frame 26 is insertable or
displaceable into the first partial frame 24, whereby the netlike
web (not shown) is positioned between the two partial frames 24, 26
and is tensioned accordingly.
[0025] Each partial frame 24, 26 comprises accordingly frame legs
20 running on three sides and forms a U-shaped design, whereby the
open end of the U-shaped arranged frame legs 20 is closed by means
of a flat connecting leg 27, so that each partial frame 24, 26 is
designed to be stable. The two partial frames each have a conical
design, in which the frame legs 20, respectively, are positioned at
an angle or slant, such that the lower edge 21 of the frame leg 20
encompasses a smaller surface than the upper edge 22 of the frame
leg 20. The surface encompassed by the lower edge of the frame leg
21 is therefore closed by the netlike web plated between the
partial frames 24, 26, which means that the netlike web is arranged
with the completed frame 16 on the conically tapered side of the
frame 16. As far as the first partial frame 24 forms the outer edge
region of the frame 16 upon placement of the frame 16, a raised
edge 25 extending over the U-shaped frame leg 20 is arranged on the
lower edge 21 of the first partial frame 24, which serves to attach
and secure the frame 16. On both oppositely disposed frame legs 20
of the two partial frames 24, in addition, three attachment
openings 28 are formed, respectively, in the embodiment shown,
which enable securing of the frame 16 onto the model structure or
in the mold sand. Thus, for example, the mold sane can penetrate
the attachment openings 28 and provide a positive locking or form
fit between the frame 16 and the mold sane. It also is contemplated
to pound a fixing nail through the attachment opening 28, in order
to anchor the frame 16 in the mold sand or also to the model
structure.
[0026] The specification incorporates by reference the disclosure
of DE 10 2015 108 656.5, filed Jun. 1, 2015.
[0027] The present invention is, of course, in no way restricted to
the specific disclosure of the specification and drawings, but also
encompasses any modifications within the scope of the appended
claims.
* * * * *