EP0257257B1 - Blowing-in device for a core shooter - Google Patents

Blowing-in device for a core shooter Download PDF

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Publication number
EP0257257B1
EP0257257B1 EP87109855A EP87109855A EP0257257B1 EP 0257257 B1 EP0257257 B1 EP 0257257B1 EP 87109855 A EP87109855 A EP 87109855A EP 87109855 A EP87109855 A EP 87109855A EP 0257257 B1 EP0257257 B1 EP 0257257B1
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EP
European Patent Office
Prior art keywords
shooting head
shooting
insert
blowing
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87109855A
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German (de)
French (fr)
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EP0257257A2 (en
EP0257257A3 (en
Inventor
Joachim Dipl.-Ing. Laempe
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Individual
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Individual
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Publication date
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Priority to AT87109855T priority Critical patent/ATE46842T1/en
Publication of EP0257257A2 publication Critical patent/EP0257257A2/en
Publication of EP0257257A3 publication Critical patent/EP0257257A3/en
Application granted granted Critical
Publication of EP0257257B1 publication Critical patent/EP0257257B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B22C15/245—Blowing tubes

Definitions

  • the invention relates to a device for injecting core sand by means of compressed air into core boxes on a core shooting machine, with a shooting head, with a shooting plate which can be detachably fastened between the shooting head and the core box on the shooting head and with a shooting tube or the like leading to the shooting head or the like, with the shooting head on on its side facing the shooting plate has a fastening flange or the like, with which the corresponding edge region of the shooting plate can be connected in the use position.
  • the shooting plate is usually screwed tightly to the outer edge of the shooting head by means of screws.
  • the pre-assembled shooting head must in turn be screwed onto the core shooter.
  • the changeover times may take a. due to the time-consuming screwing of the shooting plates, depending on the size of the machine, between 10 and 40 minutes.
  • the unproductive work involved, which is necessary due to the screwing of the shooting plates, is correspondingly large. This unproductive workload can increase if the dirt, sand or similar particles that occur during operation impair the smooth movement of the screw connection.
  • the solution to this problem is that a releasable adhesive connection is provided for connecting the flange of the shooting head to the shooting plate.
  • a detachable adhesive connection has the advantage that to loosen the shooting head and shooting plate, there is no need to first loosen secondary fastening elements for local snagging, tensioning or the like, because the two parts are connected directly. With such direct liability, the problem of difficult solubility of locally acting, secondary connecting elements due to contamination or corrosion is solved by itself.
  • a simple and effective type of such an adhesive connection consists in that a vacuum clamping connection is provided as a releasable adhesive connection between an outer fastening flange surrounding the recess for the sand guide insert and the corresponding contact area of the firing plate.
  • Liability is achieved here solely by the air pressure difference between the vacuum area and the atmospheric pressure acting on the outside of the shooting plate.
  • the plates adhere directly to one another without secondary connecting elements.
  • the functional advantage is that the connection can be made and released in an extremely simple manner. It is sufficient to actuate a vacuum pump by means of a switch, on the one hand to create the vacuum and thus the adhesive connection and on the other hand to release the adhesive connection by restoring the normal pressure in the original vacuum area. Loosening and fixing the shooting plate on the shooting head is done by simple switch operation.
  • the replacement time for a firing plate with the device according to the invention is thus many times shorter than with the previously known systems.
  • Another advantage is the simplicity of the solution according to the invention. With basically the same structure of the known shooting head systems, essentially only the vacuum pump and the creation of a vacuum-compatible space between the shooting plate and shooting head occur as a new element.
  • At least one preferably flat groove or the like recess runs around the fastening flange of the shooting head, the edges of which are surrounded by seals which project in particular from the surface of the fastening flange, and that the (on the fastening flange) n) recess (s) has a connection to a vacuum source, in particular to a vacuum pump.
  • the sealed space created in this way lies outside the working surface of the firing plate and is advantageously closed in a ring, so that a connection to a vacuum source is sufficient to empty the space.
  • the protruding seals have the advantage of pressing more and more onto the counter surface of the firing plate with increasing negative pressure and the resulting contact pressure and thus sealing better as the pressure increases.
  • a magnetic connection can be provided as a releasable adhesive connection between the shooting head and the shooting plate.
  • This embodiment of the invention is particularly advantageous if it cannot be avoided during operation that the sealability of the seals in the vacuum region or the required flatness of the counter surface on the firing plate is impaired in such a way that the sealing connection fails.
  • Such a releasable, magnetic connection can be built into the core shooting device in that at least one electromagnet is embedded in the mounting flange of the shooting head and the shooting plate consists of ferromagnetic material.
  • the loosening or fastening of the shooting plate to the shooting head can be effected solely by changing the switch position for the magnetic current.
  • the shooting plate is attracted to the magnet of the shooting head because it is made of ferromagnetic material.
  • the magnet is switched off, the shooting plate is released immediately.
  • the shooting plate does not need to be modified further, except for the choice of material. It is also sufficient here if the contact surface of the firing plate opposite the mounting flange consists of ferromagnetic material.
  • the magnet is expediently let in on the mounting flange of the shooting head because it is the stationary element of both parts to be connected.
  • the speed of changing the firing plate is determined not only by the duration of the screwing and unscrewing of the firing plate on the shooting head, but also by the working time required to change the firing channel belonging to each firing plate.
  • the entire shooting head in order to replace the shooting channel, the entire shooting head must be detached from the shooting tube jacket.
  • the shooting head has a recess which is open towards the shooting plate and in which a sand guide insert fits particularly flush with the contact surfaces of the flanges of the shooting head on the shooting plate.
  • the sand guide insert mentioned here is designed so that it fits a shooting plate belonging to it.
  • the cylindrical recess of the shooting head preferably has a bottom or the like on the side facing away from the shooting plate as an annular contact surface for the sand guiding insert, which corresponds approximately to the edge region of a sand guiding opening through the sand guiding insert and against which an axially supported on the sand guiding insert, preferably as a fastening flange trained stop or the like.
  • the shooting tube can be pressed in the use position, so that this mounting flange is in the use position only between the sand guide insert and the bottom of the shooting head recess.
  • the shooting tube can be pulled out of the pipe jacket from its flange-side end through the recess of the shooting head after removal of the sand guide insert. This eliminates the need to unscrew the entire shooting head for cleaning the shooting tube in the known systems, which further drastically reduces the dead time of the shooting device due to conversion work.
  • the shooting head is usually mounted on a collar-like widened edge of the casing tube of the core shooting machine with the help of inclined pressure screws.
  • the contact surface of the sand guide. tion insert is formed in the shooting head by a preferably widened collar-like edge of a jacket tube of the core shooting machine.
  • the outer area of the collar-like widened edge of the casing tube can be mounted on the shooting head, while the inner area of the end face of the widened edge, exposed by the recess in the shooting head, serves as a contact surface for the sand guiding insert.
  • the inner contact surface for the sand guiding insert for preferably clamping the fastening flange of the shooting tube between the shooting head and insert is formed by a bottom region of the shooting head itself facing away from the shooting plate, on the outside of which a jacket tube of the core shooting machine is placed bar and can be fastened, this bottom or the like of the shooting head having a passage opening for the shooting tube.
  • the size of the recess in the shooting head for the sand guiding insert and the fact that the shooting tube can be removed in the direction of the shooting plate in a further embodiment of the invention makes it possible to screw the casing tube directly from the inside of the recess of the shooting head without impairing the shooting channels. Centering ring, widened edge of the casing tube and pressure screws can be omitted. It can now serve to connect the shooting head to the casing tube from the recess of the shooting head for the sand guiding insert, parallel to the axis of the shooting tube and positively engaging fasteners, preferably screws.
  • the centering of the casing tube on the shooting head requires no further adjustment in this way, since a defined fit of the casing tube on the shooting head is already achieved with two screws, so that further working time can also be saved.
  • the sand guiding insert which is arranged interchangeably between the firing plate and between the shooting head and is held in the position of use by the holding forces of the firing plate on the shooting head, is made of plastic.
  • Plastic offers the advantage of saving weight compared to other materials. If the sand guide insert is held in the recess solely by the shooting plate on the shooting head, the choice of this light material reduces the necessary holding forces which have to be applied by the vacuum ring or the magnetic holder.
  • the adhesive surface between the shooting head and the shooting plate and the associated vacuum pump or the associated magnet can be made correspondingly smaller.
  • plastic design of the sand guide insert Due to the plastic design of the sand guide insert, a simple and good sealing of the contact surfaces between the sand guide insert and the firing plate or shooting head can be achieved, since plastic adapts well to smaller unevenness and also has a certain elasticity in the axis of the sandblasting direction, which means that it adapts well to it in the case of the vacuum seal, the scope of the adhesive stock between the shooting plate and the shooting head flange is achieved.
  • the shooting device 1 is delimited at its sandblast outlet end by the shooting plate 6, which is attached to the shooting head 15. Since the firing plate 6 is designed differently depending on the type of core to be fired, the firing plates often have to be replaced.
  • a vacuum adhesive connection is provided in the exemplary embodiment shown (FIG. 1) for attaching and detaching the shooting plate to the shooting head 15.
  • annular groove 24 is embedded in the end face 12 of an annular fastening flange 21 of the shooting head 15 facing the shooting plate 6. 1 and 2, clearly marked by black dots, ring-shaped seals 23 can be seen, which are attached close to the inner and outer circumference of the ring groove. After the shooting plate 6 has been placed against the shooting head 15, these seals bear on the counter surface 13 of the shooting plate facing the shooting head and thus delimit an annular space which extends around the circumference of the flange 21 of the shooting head jacket 4.
  • connection 25 leading to the annular groove 24 is now connected to a vacuum pump and this is put into operation, a vacuum is formed in the rough sealed by the seals 23, which causes the shooting head plate 6 to be pressed against the shooting head jacket 4 or the sand guide insert 5 leads.
  • the firing plate can be released again by switching off the vacuum pump and admitting air through the connection 25.
  • the vacuum surface encompassed by the sealing elements 23 or the annular groove 24 is matched to the weight of the firing plate 6.
  • the shooting plate 6 is loosened and fixed on the shooting head jacket 4 according to what has been described above, that is to say by simply operating a switch.
  • the replacement time for a firing plate with the device according to the invention is thus many times shorter than with the previously known screw connections.
  • annular groove 24 can be constructed with other types of recesses, e.g. B. several independently circumferential grooves 24 which are sealed against one another by seals 23 and thus z. B. against leaks of individual seals 23 are less susceptible.
  • Recesses are also possible which do not run in a ring shape, but rather cover or partially cover the end face 12 of the flange 21 in sectors which are delimited from one another.
  • the groove can also be provided on the edge surface of the shooting plate 6 opposite the end face 12 of the fastening flange 21 of the shooting head casing 4, which would lead to a, albeit minimal, weight saving of the shooting plate 6.
  • a magnetic connection is shown in FIG. 3 as another type of adhesive connection between the shooting plate 6 and the shooting head jacket 4.
  • Electrical lines acting as electromagnet 26 are embedded in the mounting flange 21 on its end face 12 and generate a magnetic field when current flows through the connecting lines 27, by means of which the shooting plate 6, which is made of ferromagnetic material, is attracted. It is not necessary here for the entire shooting plate 6 to be made of ferromagnetic material, but it is sufficient if at least the edge area which comes into contact with the end face 12 of the shooting head casing 4 can be magnetized.
  • Such a magnetic connection is particularly advantageous if the seals 24 of a vacuum adhesive system can easily be damaged during the production process.
  • the shooting head has a recess which is open towards the shooting plate 6 and in which a sand guide insert 5 fits particularly flush with the contact surfaces 12 of the flange 21 of the shooting head 15.
  • the shooting head 15 thus breaks down constructively into a shooting head jacket 4 and the sand guiding insert 5. Unscrewing the entire shooting head 15 to adapt the sand guiding to the different shooting plates 6 is therefore unnecessary.
  • the sand guide insert can be easily removed from the shooting head jacket 4 after the firing plate 6 has been released.
  • the cylindrical recess of the shooting head 15 in the exemplary embodiments, into which the equally cylindrical sand guiding insert 5 fits, has a bottom 19 on the side facing away from the shooting plate as an annular contact surface for the sand guiding insert 5, which corresponds to the edge region of the sand guiding opening through the sand guiding insert 5 in the exemplary embodiment .
  • a mounting flange 7 of the shooting tube 2, which is axially supported on the sand guide insert 5, can be pressed against the bottom 19 of the shooting head casing, which is designed as an annular contact surface, so that this mounting flange 7 is in the position of use exclusively between the sand guide insert 5 and the bottom 19 of the shooting head recess (FIG .2).
  • the sand guide insert 5 is now simultaneously pressed against the flange 7 by the pressure of the shooting plate 6.
  • the fastening flange of the shooting tube 2 can be dispensed with, which results in an even simpler construction.
  • the shooting tube 2 is simply inserted with the end face of its shooting head end into an annular groove 28 on the circumference of the sand guiding opening of the sand guiding insert 5.
  • the invention is applicable both to conventional shooting head mounting systems and to simplified mounting systems to be shown below.
  • 1 and 2 each show an exemplary embodiment with a conventional type of fastening of the shooting head 15 at the foot of the casing tube 3.
  • This is a pressure screw fastening mechanism in which pressure screws 17 directed towards an externally conically widened edge 16 of the foot of the casing tube 3 are the shooting head 15 connect with the casing tube 3.
  • the foot surface 3a of the conically widened tubular casing foot serves on its outer edge as a support surface for its attachment to the shooting head casing 4 and in its inner area as a contact surface for the sand guide insert 5 or the shooting tube flange 7 lying between the contact surface of the sand guide insert 5 and the foot surface 3a (Fig. 1).
  • FIG. 2 shows, in one exemplary embodiment, a simplified manner of fastening the shooting head casing 4 to the casing tube 3.
  • the inner contact surface for the sand guide insert or for the flange 7 of the shooting tube 2 is formed here by the bottom region 19 of the recess in the shooting head 15 itself and no longer, as shown in FIGS. 1 and 3, by the base surface 3a of the jacket tube 3.
  • the jacket tube 3 is placed on the outside of the shooting head shell in this exemplary embodiment, the shooting tube 2 being guided through its through-hole 20 through the shooting head jacket to its contact surface in the shooting head.
  • the shooting tube 2 can here as with the conventional type of attachment with the help of Pressure screws are either clamped with a flange between the sand guide insert 5 and the inner contact surface in the shooting head 15 or inserted into a groove 28 of the sand guide insert 5 as described above.
  • the pot-like shape of the shooting head jacket in this exemplary embodiment in contrast to the conventional fastening method for connecting the shooting head jacket 4 to the jacket tube 3, can be inserted from the recess of the shooting head jacket 4 for the sand guiding insert 5, runs parallel to the axis of the shooting tube 2 and engages in the jacket tube 3 in a form-fitting manner
  • Use screws 22 These screws, which are driven through the bottom 19 of the shooting head casing 4, solve both the problem of centering the tubular casing 3 on the shooting head casing 4 and the problem of contamination of these screw connections. Their inner layer protects them from dirt that could affect their ability to move.
  • the use of plastic as a material for the sand guide insert 5 has a favorable effect. Because firstly, the weight savings compared to other materials, the holding forces, which are required for the attachment of the shooting plate and the holding of the sand guide insert in the recess, are reduced, so that the adhesive connections can be dimensioned correspondingly smaller and less costly. On the other hand, plastic ensures a good seal on the contact surfaces and is inexpensive to manufacture.
  • the adhesive connection between the shooting plate 6 and the shooting head jacket 4 is not only a vacuum adhesive connection or a magnetic adhesive connection, as shown in the exemplary embodiments, but both types of adhesive connections can be combined with one another in a wide variety of ways.
  • the invention and its embodiments reduce the working time required to change the firing plate to less than 20 seconds.
  • the main advantage of the invention and its refinements is that only the quick adhesive connection has to be loosened and restored to replace or clean the inserts. A change of the entire shooting head system is therefore unnecessary.
  • the design effort, which the invention presupposes, is extremely low compared to these advantages.

Abstract

A core making machine wherein a selected blow plate is attracted to the blow head by suction and/or by one or more magnets so that the connection between the blow head and the plate can be terminated or established practically instantaneously without the utilization of screws, bolts and nuts, clamps, hooks or other conventional fasteners.

Description

Die Erfindung betriift eine Vorrichtung zum Einschießen von Kernsand mittels Preßluft in Kernbüchsen an einer Kernschießmaschine, mit einem Schießkopf, mit einer zwischen Schießkopf und Kernbüchse am Schießkopf lösbar befestigbaren Schießplatte und mit einem zu dem Schießkopf führenden Schießrohr od. dgl. Sandzuführung, wobei der Schießkopf an seiner der Schießplatte zugewandten Seite einen Befestigungsflansch od. dgl. hat, mit welchem der entsprechende Randbereich der Schießplatte in Gebrauchstellung verbindbar ist.The invention relates to a device for injecting core sand by means of compressed air into core boxes on a core shooting machine, with a shooting head, with a shooting plate which can be detachably fastened between the shooting head and the core box on the shooting head and with a shooting tube or the like leading to the shooting head or the like, with the shooting head on on its side facing the shooting plate has a fastening flange or the like, with which the corresponding edge region of the shooting plate can be connected in the use position.

Vorrichtungen dieser Art sind bekannt. Zum Herstellen von Gußkernen wird durch solche Kernschießmaschinen Kernsand mittels Preßluft in Kernbüchsen geschossen. Zu diesem Zweck sind an der Kernschießmaschine sogenannte Schießköpfe mit einer entsprechenden Schießplatte vorgesehen. die Schießplatte hat hierbei eine entsprechende Lochung zum Einschießen des Sandes in die Kernbüchse. (DE-A 2 834721)Devices of this type are known. To produce cast cores, core sanding machines use core air to shoot core sand into core boxes using compressed air. For this purpose, so-called shooting heads with a corresponding shooting plate are provided on the core shooting machine. the shooting plate has a corresponding perforation for shooting the sand into the core box. (DE-A 2 834721)

Verschiedene Schießkerne erfordern verschiedene Kernbüchsen und damit auch verschiedene an sie angepaßte Schießplatten. Da üblicherweise Hunderte von verschiedenen Kernbüchsen in dem Gießereien verwendet werden, ist die Anzahl der verwendeten Schießplatten entsprechend groß.Different shooting cores require different core rifles and thus different shooting plates adapted to them. Since hundreds of different core liners are usually used in the foundries, the number of shooting plates used is correspondingly large.

Üblicherweise wird die Schießplatte mittels Schrauben an den äußeren Rand des Schießkopfes fest angeschraubt. Der so vormontierte Schießkopf muß wiederum an der Kernschießmaschine angeschraubt werden. Die Umrüstzeiten dauern u. a. wegen der zeitaufwendigen Verschraubung der Schießplatten je nach Größe der Maschine zwischen 10 und 40 Minuten. Entsprechend groß ist der an sich unproduktive Arbeitsaufwand, welcher durch das Verschrauben der Schießplatten notwending wird. Dieser unproduktive Arbeitsaufwand kann sich dann noch erhöhen, wenn die beim Betrieb im großen Umfange auftretenden Schmutz-, Sand-oder ähnlichen Partikel die Gängigkeit der Schraubverbindung beeinträchtigen.The shooting plate is usually screwed tightly to the outer edge of the shooting head by means of screws. The pre-assembled shooting head must in turn be screwed onto the core shooter. The changeover times may take a. due to the time-consuming screwing of the shooting plates, depending on the size of the machine, between 10 and 40 minutes. The unproductive work involved, which is necessary due to the screwing of the shooting plates, is correspondingly large. This unproductive workload can increase if the dirt, sand or similar particles that occur during operation impair the smooth movement of the screw connection.

Bei größeren Schießköpfen besteht zudem die Gefahr, daß bei höheren Schießdrücken zwischen Schießkopf und Schießplatten Undichtigkeiten auftreten. Desweiteren besteht die Gefahr, daß beim häufigen Anschrauben der Schießplatten an den Schießkopf die Gewinde herausgerissen werden.With larger shooting heads there is also the risk that leaks occur at higher shooting pressures between the shooting head and the shooting plates. Furthermore, there is a risk that the threads will be torn out when the shooting plates are screwed onto the shooting head frequently.

Es besteht deshalb die Aufgabe, die Auswechselgeschwindigkeit für die Schießplatte bedeutend zu erhöhen und gleichzeitig die Druckfestigkeit der Verbindung von Schießkopf und Schießkopfplatte wesentlich zu verbessern, so wie eine Abnutzung des Verbindungsmechanismus auch bei längerem Betrieb zu vermindern und damit die Sicherheit der Virbindung auch bei langem Gebrauch zu erhöhen.It is therefore the task of significantly increasing the replacement speed for the shooting plate and at the same time significantly improving the pressure resistance of the connection between the shooting head and the shooting head plate, as well as reducing the wear of the connecting mechanism even during prolonged operation, and thus the security of the binding even with long use to increase.

Die Lösung dieser Aufgabe besteht darin, daß zur Verbindung des Flanches des Schießkopfes mit der Schießplatte eine lösbare Haftverbindung vorgesehen ist.The solution to this problem is that a releasable adhesive connection is provided for connecting the flange of the shooting head to the shooting plate.

Eine lösbare Haftverbindung hat den Vorteil, daß zum Lösen von Schießkopf und Schießplatte nicht erst sekundäre Befestigungselemente zum lokalen Verhaken, Verspannen od. dgl. gelöst werden müssen, weil die Verbindung beider Teile unmittelbar erfolgt. Bei einer solchen unmittelbaren Haftung erledigt sich das Problem schwerer Lösbarkeit von lokal wirkenden, sekundären Verbindungselementen aufgrund von Verschmutzungen oder Korrosion von selbst.A detachable adhesive connection has the advantage that to loosen the shooting head and shooting plate, there is no need to first loosen secondary fastening elements for local snagging, tensioning or the like, because the two parts are connected directly. With such direct liability, the problem of difficult solubility of locally acting, secondary connecting elements due to contamination or corrosion is solved by itself.

Eine einfache und wirksame Art einer solchen Haftverbindung besteht darin, daß als lösbare Haftverbindung eine Vakuum-Spannverbindung zwischen einem äußeren, um die Ausnehmung für den Sandführungseinsatz umlaufenden Befestigungsflansch und dem entsprechenden Anlagebereich der Schießplatte vorgesehen ist.A simple and effective type of such an adhesive connection consists in that a vacuum clamping connection is provided as a releasable adhesive connection between an outer fastening flange surrounding the recess for the sand guide insert and the corresponding contact area of the firing plate.

Die Haftung wird hier allein durch die Luftdruckdifferenz zwischen Vakuum-Bereich und außen an der Schießplatte wirkendem Atmosphärendruck verwirklicht. Die Platten haften ohne sekundäre Verbindungselemente unmittelbar aneinander. Der funktionelle Vorteil liegt darin, daß die Verbindung in extrem einfacher Art und Weise hergestellt und gelöst werden kann. Es reicht insoweit die Betätigung einer Vakuumpumpe durch einen Schalter, um einerseits das Vakuum und damit die Haftverbindung herzustellen und andererseits die Haftverbindung durch Wiederherstellen des Normaldruckes im ursprünglichen Vakuumbereich zu lösen. Lösen und Fixieren der Schießplatte auf dem Schießkopf geschieht somit durch einfache Schalterbetätigung. Die Auswechselzeit für eine Schießplatte mit der erfindungsgemäßen Vorrichtung ist somit um ein Vielfaches kürzer als mit den bisher verwandten bekannten Systemen.Liability is achieved here solely by the air pressure difference between the vacuum area and the atmospheric pressure acting on the outside of the shooting plate. The plates adhere directly to one another without secondary connecting elements. The functional advantage is that the connection can be made and released in an extremely simple manner. It is sufficient to actuate a vacuum pump by means of a switch, on the one hand to create the vacuum and thus the adhesive connection and on the other hand to release the adhesive connection by restoring the normal pressure in the original vacuum area. Loosening and fixing the shooting plate on the shooting head is done by simple switch operation. The replacement time for a firing plate with the device according to the invention is thus many times shorter than with the previously known systems.

Ein weiterer Vorteil besteht in der Einfachheit der erfindungsgemäßen Lösung. Bei grundsätzlich gleichem Aufbau der bekannten Schießkopfsysteme tritt als neues Element hier im wesentlichen nur die Vakuumpumpe und die Schaffung eines vakuumfähigen Zwischenraumes zwischen Schießplatte und Schießkopf auf.Another advantage is the simplicity of the solution according to the invention. With basically the same structure of the known shooting head systems, essentially only the vacuum pump and the creation of a vacuum-compatible space between the shooting plate and shooting head occur as a new element.

In weiterer Ausgestaltung der Erfindung erweist es sich als zweckmäßig, wenn an dem Befestigungsflansch des Schießkopfes wenigstens eine vorzugsweise flache Nut od. dgl. Ausnehmnung umläuft, deren Ränder von insbesondere gegenüber der Oberfläche des Befestigungsflansches überstehenden Dichtungen umgeben sind, und daß die am Befestigungsflansch befindliche(n) Ausnehmung(en) einen Anschluß zu einer Unterdruckquelle, insbesondere zu einer Vakuumpumpe, aufweist. Der auf diese Weise geschaffene, abgedichtete Raum liegt außerhalb der Arbeitsfläche der Schießplatte und ist in vorteilhafter Weise ringförmig geschlossen, so daß ein Anschluß zu einer Unterdruckquelle zum Leerpumpen des Raumes ausreicht.In a further embodiment of the invention, it proves to be expedient if at least one preferably flat groove or the like recess runs around the fastening flange of the shooting head, the edges of which are surrounded by seals which project in particular from the surface of the fastening flange, and that the (on the fastening flange) n) recess (s) has a connection to a vacuum source, in particular to a vacuum pump. The sealed space created in this way lies outside the working surface of the firing plate and is advantageously closed in a ring, so that a connection to a vacuum source is sufficient to empty the space.

Die überstehenden Dichtungen haben den Vorteil, bei zunehmendem Unterdruck und des sich damit erhöhenden Anpreßdruckes immer stärker auf die Gegenfläche der Schießplatte zu drücken und damit bei sich erhöhendem Druck um so besser abzudichten.The protruding seals have the advantage of pressing more and more onto the counter surface of the firing plate with increasing negative pressure and the resulting contact pressure and thus sealing better as the pressure increases.

Da der Befestigungsflansch bereits zur Aufnahme der lokal wirkenden, sekundären Verbindungselemente wie Schrauben, Bolzen od. dgl. bei den bekannten, bisher verwandten Schießkopfsystemen vorhanden ist, ermöglicht diese Ausgestaltung der Vakuumverbindung zugleich einen preiswerten Umbau alter Systeme auf das neue, erfindungsgemäße Prinzip.Since the mounting flange already holds the locally acting, secondary connecting elements such as screws, bolts or the like in the known, previously used shooting head systems is present, this configuration of the vacuum connection also enables inexpensive conversion of old systems to the new principle according to the invention.

In anderer Ausgestaltung der Erfindung kann als lösbare Haftverbindung zwischen Schießkopf und Schießplatte eine magnetische Verbindung vorgesehen sein. Diese Ausgestaltung der Erfindung ist dann besonders vorteilhaft, wenn es beim Betrieb nicht vermieden werden kann, daß die Dichtfähigkeit der Dichtungen des Vakuum-Bereiches oder die erforderliche Ebenheit der Gegenfläche auf der Schießplatte so beeinträchtigt wird, daß die Dichtverbindung versagt.In another embodiment of the invention, a magnetic connection can be provided as a releasable adhesive connection between the shooting head and the shooting plate. This embodiment of the invention is particularly advantageous if it cannot be avoided during operation that the sealability of the seals in the vacuum region or the required flatness of the counter surface on the firing plate is impaired in such a way that the sealing connection fails.

Eine solche lösbare, magnetische Verbindung kann dadurch in die Kernschießvorrichtung eingebaut werden, daß an dem Befestigungsflansch des Schießkopfes wenigstens ein Elektromagnet eingelassen ist und die Schießplatte aus ferromagnetischem Werkstoff besteht.Such a releasable, magnetic connection can be built into the core shooting device in that at least one electromagnet is embedded in the mounting flange of the shooting head and the shooting plate consists of ferromagnetic material.

Auch hier ergibt sich wiederum der Vorteil, daß die Lösung bzw. das Befestigen der Schießplatte auf dem Schießkopf allein durch die Veränderung der Schalterstellung für den Magnetstrom bewirkt werden kann. Bei eingeschaltetem Strom wird die Schießplatte vom Magneten des Schießkopfes angezogen, weil sie aus ferromagnetischem Werkstoff besteht, bei ausgeschaltetem Magnet löst sich die Schießplatte sofort.Here, too, there is again the advantage that the loosening or fastening of the shooting plate to the shooting head can be effected solely by changing the switch position for the magnetic current. When the power is switched on, the shooting plate is attracted to the magnet of the shooting head because it is made of ferromagnetic material. When the magnet is switched off, the shooting plate is released immediately.

In dieser Ausgestaltung braucht die Schießplatte bis auf die Wahl des Werkstoffes nicht weiter modifiziert werden. Es reicht hier zudem aus, wenn die dem Befestigungsflansch gegenüberliegende Anlagefläche der Schießplatte aus ferromagnetischem Werkstoff besteht.In this embodiment, the shooting plate does not need to be modified further, except for the choice of material. It is also sufficient here if the contact surface of the firing plate opposite the mounting flange consists of ferromagnetic material.

Auf diese Weise kann weiter an Herstellungskosten und Gewicht der Schießplatte eingespart werden.In this way, the manufacturing costs and weight of the shooting plate can be further reduced.

Der Magnet wird zweckmäßigerweise deshalb an dem Befestigungsflansch des Schießkopfes eingelassen, weil der das stationäre Element beider zu verbindender Teile ist.The magnet is expediently let in on the mounting flange of the shooting head because it is the stationary element of both parts to be connected.

Die Schnelligkeit des Wechselns der Schießplatte wird nicht nur durch die Dauer des An- und Abschraubens der Schießplatte an dem Schießkopf bestimmt, sondern gleichfalls durch die Arbeitszeit, welche zum Wechseln des jeweils zu einer Schießplatte gehörigen Schußkanals benötigt wird. Bei den bekannten Systemen ist zum Auswechseln des Schießkanals jeweils die Lösung des gesamten Schießkopfes von dem Schießrohrmantel notwendig. Zur Beschleunigung des Schießplattenwechsels erweist es sich deshalb als zweckmäßig, wenn der Schießkopf eine zur Schießplatte hin offene Ausnehmung aufweist, in der ein Sandführungseinsatz insbesondere bündig mit den Anlageflächen des Flanches des Schießkopfes an der Schießplatte paßt. Der hier genannte Sandführungseinsatz ist dabei jeweils so ausgestaltet, daß er zu einer zu ihm gehörigen Schießplatte paßt. Die zum Wechseln der Schießplatte erforderliche Arbeit kann auf diese Weise darauf reduziert werden, mit der Schießplatte zusammen den Sandführungseinsatz aus der Ausnehmung im Schießkopf herauszunehmen und gegen einen geeigneten zur neuen Schießplatte passenden Sandführungseinsatz auszuwechseln. Ein vollständiges Abmontieren des Schießkopfes wird auf diese Weise überflüssig.The speed of changing the firing plate is determined not only by the duration of the screwing and unscrewing of the firing plate on the shooting head, but also by the working time required to change the firing channel belonging to each firing plate. In the known systems, in order to replace the shooting channel, the entire shooting head must be detached from the shooting tube jacket. In order to accelerate the shooting plate change, it therefore proves to be expedient if the shooting head has a recess which is open towards the shooting plate and in which a sand guide insert fits particularly flush with the contact surfaces of the flanges of the shooting head on the shooting plate. The sand guide insert mentioned here is designed so that it fits a shooting plate belonging to it. In this way, the work required to change the shooting plate can be reduced to taking the sand guide insert together with the shooting plate out of the recess in the shooting head and replacing it with a suitable sand guide insert suitable for the new shooting plate. This completely eliminates the need to remove the shooting head.

Dabei weist die zylindrische Ausnehmung des Schießkopfes auf der der Schießplatte abgewandten Seite vorzugsweise einen Boden od. dgl. als ringförmige Anlagefläche für den Sandführungseinsatz auf, die etwa dem Randbereich einer Sandführungsöffnung durch den Sandführungseinsatz entspricht und gegen welche ein an dem Sandführungseinsatz axial abgestützter vorzugsweise als Befestigungsflansch ausgebildeter Anschlag od. dgl. des Schießrohres in Gebrauchstellung andrückbar ist, so daß sich dieser Befestigungsflansch in Gebrauchstellung ausschließlich zwischen dem Sandführungseinsatz und dem Boden der Schießkopf-Ausnehmung befindet. Befindet sich der Befestigungsflansch od. dgl. des Schießrohres ausschließlich zwischen dem Sandführungseinsatz und dem Boden der Schießkopf-Ausnehmung, so kann das Schießrohr nach der Herausnahme des Sandführungseinsatzes von seinem flanschseitigen Endeher durch die Ausnehmung des Schießkopfes hindurch aus dem Rohrmantel herausgezogen werden. Somit erübrigt sich aus das zur Reinigung des Schießrohres bei den nekannten Systemen notwendigen Abschrauben des gesamten Schießkopfes, wodurch die durch Umbauarbeiten bedingte Totzeit der Einschießvorrichtung in gewünschter Weise weiter drastisch vermindert wird.The cylindrical recess of the shooting head preferably has a bottom or the like on the side facing away from the shooting plate as an annular contact surface for the sand guiding insert, which corresponds approximately to the edge region of a sand guiding opening through the sand guiding insert and against which an axially supported on the sand guiding insert, preferably as a fastening flange trained stop or the like. The shooting tube can be pressed in the use position, so that this mounting flange is in the use position only between the sand guide insert and the bottom of the shooting head recess. If the mounting flange or the like of the shooting tube is located exclusively between the sand guide insert and the bottom of the shooting head recess, the shooting tube can be pulled out of the pipe jacket from its flange-side end through the recess of the shooting head after removal of the sand guide insert. This eliminates the need to unscrew the entire shooting head for cleaning the shooting tube in the known systems, which further drastically reduces the dead time of the shooting device due to conversion work.

In den herkömmlichen Konstruktionen ist der Schießkopf in der Regel an einem bundartig verbreiterten Rand des Mantelrohres der Kernschießmaschine mit Hilfe von schräggestellten Druckschrauben gegengelagert. Um die Erfindung auch bei dieser Konstruktion der Kerneinschießmaschine in einfacher Weise anwenden zu können, ist es zweckmäßig, wenn die Anlagefläche des Sandfüh-. rungseinsatzes im Schießkopf von einem vorzugsweise zur Festlegung des Schießkopfes bundartig verbreiterten Rand eines Mantelrohres der Kernschießmaschine gebildet ist. Hierbei kann insbesondere der äußere Bereich des bundartig verbreiterten Randes des Mantelrohres am Schießkopf gegengelagert sein, während der innere Bereich der Stirnfläche des verbreiterten Randes, durch die Ausnehmung im Schießkopf freigelegt, als Anlagefläche des Sandführungseinsatzes dient.In conventional constructions, the shooting head is usually mounted on a collar-like widened edge of the casing tube of the core shooting machine with the help of inclined pressure screws. In order to be able to use the invention in a simple manner in this construction of the core insertion machine, it is expedient if the contact surface of the sand guide. tion insert is formed in the shooting head by a preferably widened collar-like edge of a jacket tube of the core shooting machine. In particular, the outer area of the collar-like widened edge of the casing tube can be mounted on the shooting head, while the inner area of the end face of the widened edge, exposed by the recess in the shooting head, serves as a contact surface for the sand guiding insert.

Insbesondere bei der Herstellung neuer Kernschießmaschinen erweist es sich als vorteilhaft, wenn die innere Anlagefläche für den Sandführungseinsatz zum vorzugsweisen Einklemmen des Befestigungsflansches des Schießrohres zwischen Schießkopf und Einsatz von einem der Schießplatte abgewandten Bodenbereich des Schießkopfes selbst gebildet ist, auf dessen Außenseite ein Mantelrohr der Kernschießmaschine aufsetz bar und befestigbar ist, wobei dieser Boden od. dgl. des Schießkopfes eine Durchtrittsöffnung für das Schießrohr hat. Die Erfindung ermöglicht nämlich insbesondere in der vorliegenden Ausgestaltung ein Verzicht auf die bischer übliche Befestigung des Schießkopfes am Mantelrohr durch außenliegende schräggestellte Druckschrauben. Diese au- ßenliegenden Druckschrauben haben den Nachteil, daß sie einerseits sehr schnell an Gängigkeit verlieren, weil sie durch beim Arbeitsprozeß frei werdende Partikel im Gewindebereich leicht verschmutzen können und weil sie zudem bei längerer Gebrauchsdauer durch die Beaufschlagung eines am Mantelrohr notwendigen Zentrierringes diesen abnutzen bzw. beschädigen, so daß die Zentrierung des Mantelrohres auf dem Schießkopf mit fortlaufendem Gebrauch immer schwieriger und damit auch arbeitsaufwendiger wird.In particular in the production of new core shooters, it proves to be advantageous if the inner contact surface for the sand guiding insert for preferably clamping the fastening flange of the shooting tube between the shooting head and insert is formed by a bottom region of the shooting head itself facing away from the shooting plate, on the outside of which a jacket tube of the core shooting machine is placed bar and can be fastened, this bottom or the like of the shooting head having a passage opening for the shooting tube. This is because, in particular in the present embodiment, the invention makes it possible to dispense with the usual fastening of the shooting head to the tubular casing by external inclined pressure screws. These external pressure screws have the disadvantage that that on the one hand they lose their ability to move very quickly because they can easily become soiled by particles released in the work process in the thread area and because they also wear or damage them over a longer period of time by acting on a centering ring necessary on the jacket tube, so that the centering of the jacket tube occurs the shooting head becomes more and more difficult with continuous use and therefore more labor-intensive.

Durch die Größe der Ausnehmung im Schießkopf für den Sandführungseinsatz und die in weiterer Ausgestaltung der Erfindung gegebene Herausnehmbarkeit des Schießrohres in Richtung der Schießplatte ergibt sich die Möglichkeit, das Mantelrohr ohne Beeinträchtigung der Schießkanäle von der Innenseite der Ausnehmung des Schießkopfes her unmittelbar zu verschrauben. Zentrierungsring, bundartig verbreiterter Rand des Mantelrohres und Druckschrauben können entfallen. Dabei können zur Verbindung des Schießkopfes mit dem Mantelrohr nunmehr von der Ausnehmung des Schießkopfes für den Sandführungseinsatz her einführbare, parallel zur Achse des Schießrohres verlaufende, in das Mantelrohr formschlüssig eingreifende Befestigungselemente, vorzugweise Schrauben dienen.The size of the recess in the shooting head for the sand guiding insert and the fact that the shooting tube can be removed in the direction of the shooting plate in a further embodiment of the invention makes it possible to screw the casing tube directly from the inside of the recess of the shooting head without impairing the shooting channels. Centering ring, widened edge of the casing tube and pressure screws can be omitted. It can now serve to connect the shooting head to the casing tube from the recess of the shooting head for the sand guiding insert, parallel to the axis of the shooting tube and positively engaging fasteners, preferably screws.

Die Zentrierung des Mantelrohres auf dem Schießkopf erfordert auf diese Weise keine weitere Justierung, wiel bereits durch zwei Schrauben ein definierter Sitz des Mantelrohres auf dem Schießkopf erreicht wird, so daß auch hierdurch weitere Arbeitszeit eingespart werden kann.The centering of the casing tube on the shooting head requires no further adjustment in this way, since a defined fit of the casing tube on the shooting head is already achieved with two screws, so that further working time can also be saved.

Ein weiterer eintscheidender Vorteil ergibt sich in Ausgestaltung der Erfindung dadurch, daß der zwischen Schießplatte und zwischen Schießkopf auswechselbar angeordnete und durch die Haltekräfte der Schießplatte am Schießkopf in Gebrauchsstellung gehaltene Sandführungseinsatz aus Kunstsoff besteht. Kunststoff bietet gegenüber anderen Materialien hier den Vorteil der Gewichtsersparnis. Wird der Sandführungseinsatz allein durch die Schießplatte am Schießkopf in der Ausnehmung gehalten, verringern sich durch die Wahl dieses leichten Werkstoffes die notwendigen Haltekräfte, welche durch den Vakuumring bzw. die Magnethalterung aufgebracht werden müssen. Entsprechend kleiner kann die Haftfläche zwischen Schießkopf und Schießplatte sowie die dazugehörige Vakuumpumpe bzw. der dazugehörige Magnet ausgestaltet sein. Durch die Kunststoffausführung des Sandführungseinsatzes kann weiterhin eine einfache und gute Abdichtung der Anlageflächen zwischen Sandführungseinsatz und Schießplatte bzw. Schießkopf erreicht werden, da sich Kunststoff gut an kleinere Unebenheiten anpaßt und zudem in der Achse der Sandstrahlrichtung eine gewisse Elastizität aufweist, wodurch eine gute Anpassung an dem beim Vakummverschluß auftretenden Spielraum des Haftbestandes zwischen Schießplatte und Schießkopfflansch erzielt wird.A further decisive advantage results in an embodiment of the invention in that the sand guiding insert, which is arranged interchangeably between the firing plate and between the shooting head and is held in the position of use by the holding forces of the firing plate on the shooting head, is made of plastic. Plastic offers the advantage of saving weight compared to other materials. If the sand guide insert is held in the recess solely by the shooting plate on the shooting head, the choice of this light material reduces the necessary holding forces which have to be applied by the vacuum ring or the magnetic holder. The adhesive surface between the shooting head and the shooting plate and the associated vacuum pump or the associated magnet can be made correspondingly smaller. Due to the plastic design of the sand guide insert, a simple and good sealing of the contact surfaces between the sand guide insert and the firing plate or shooting head can be achieved, since plastic adapts well to smaller unevenness and also has a certain elasticity in the axis of the sandblasting direction, which means that it adapts well to it in the case of the vacuum seal, the scope of the adhesive stock between the shooting plate and the shooting head flange is achieved.

Nachstehend ist die Erfindung mit den ihr als wesentlich zugehörigen Einzelheiten anhand der Zeichnungen noch näher beschrieben.The invention is described in more detail below with the details that are essential to it, using the drawings.

Es zeigen :

  • Fig. 1 eine erfindungsgemäße Einschießvorrichtung mit konisch verbreitertem Mantelrohrfuß und Schießrohrbefestigungsflansch, dargestellt in axialem Längsschnitt,
  • Fig. 2 eine erfindungsgemäße Einschießvorrichtung mit axialer Rohrmantelbefestigung und mit Schießrohrbefestigungsflansch, dargestellt in axialem Längsschnitt,
  • Fig. 3 eine erfindungsgemäße Einschießvorrichtung mit konisch verbreitertem Mantelrohrfuß und einem Schießrohr ohne Befestigungsflansch, dargestellt in axialem Längsschnitt.
Show it :
  • 1 shows a shooting device according to the invention with a conically widened tubular casing foot and a shooting pipe mounting flange, shown in axial longitudinal section,
  • 2 shows a shooting device according to the invention with an axial tubular jacket attachment and with a shooting tube attachment flange, shown in axial longitudinal section,
  • Fig. 3 shows a shooting device according to the invention with a conically widened casing tube foot and a shooting tube without a mounting flange, shown in axial longitudinal section.

Eine in Fig. 1 im ganzen mit 1 bezeichnete Einschießvorrichtung einer nicht weiter dargestellten Kerneinschießmaschine besteht aus einem Einschießrohr 2 und einem ihn umgebenden Mantelrohr 3, das in seinem Fußbereich von einem Schießkopf 15 umschlossen ist. Die Einschießvorrichtung 1 wird an ihrem sandstrahlaustrittseitigen Ende von der Schießplatte 6 begrenzt, die am Schießkopf 15 befestigt ist. Da die Schießplatte 6 je nach Art des zu schießenden Kernes verschieden ausgebildet ist, müssen die Schießplatten häufig ausgewechselt werden. Um den Auswechselungsvorgang wesentlich zu beschleunigen, ist im dargestellten Ausführungsbeispiel (Fig. 1) zum Befestigen und Lösen der Schießplatte am Schießkopf 15 eine Vakuumhaftverbindung vorgesehen.1 in FIG. 1, as a whole, of a core insertion machine, not shown, consists of an insertion tube 2 and a jacket tube 3 surrounding it, which is enclosed in its foot region by a shooting head 15. The shooting device 1 is delimited at its sandblast outlet end by the shooting plate 6, which is attached to the shooting head 15. Since the firing plate 6 is designed differently depending on the type of core to be fired, the firing plates often have to be replaced. In order to accelerate the exchange process significantly, a vacuum adhesive connection is provided in the exemplary embodiment shown (FIG. 1) for attaching and detaching the shooting plate to the shooting head 15.

Zu diesem Zweck ist in der der Schießplatte 6 zugewandten Stirnfläche 12 eines ringförmigen Befestigungsflansches 21 des Schießkopfes 15 eine ringförmige Nut 24 eingelassen. In den Fig. 1 und 2 sind, durch schwarze Punkte deutlich markiert, ringförmige Dichtungen 23 erkennbar, die nahe am inneren und am äußeren Umfang der Ringnut angebracht sind. Nach dem Anlegen der Schießplatte 6 an den Schießkopf 15 liegen diese Dichtungen auf der dem Schießkopf zugewandten Gegenfläche 13 der Schießplatte an und begrenzen damit einen ringförmigen Raum, der sich um den Umfang des Flansches 21 des Schießkopfmantels 4 erstreckt.For this purpose, an annular groove 24 is embedded in the end face 12 of an annular fastening flange 21 of the shooting head 15 facing the shooting plate 6. 1 and 2, clearly marked by black dots, ring-shaped seals 23 can be seen, which are attached close to the inner and outer circumference of the ring groove. After the shooting plate 6 has been placed against the shooting head 15, these seals bear on the counter surface 13 of the shooting plate facing the shooting head and thus delimit an annular space which extends around the circumference of the flange 21 of the shooting head jacket 4.

Wird nun der zu der Ringnut 24 führende Anschluß 25 an eine Vakuumpumpe angeschlossen und diese in Betrieb genommen, so bildet sich in dem von den Dichtungen 23 abgedichteten Rau, Unterdruck aus, der zu einem Anpressen der Schießkopfplatte 6 an den Schießkopfmantel 4 bzw. den Sandführungseinsatz 5 führt. Durch Abschalten der Vakuumpumpe und Einlaß von Luft durch den Anschluß 25 kann die Schießplatte wieder gelöst werden. Die von den Dichtungselementen 23 bzw. der Ringnut 24 umfaßte Unterdruckfläche ist hierbei auf das Gewicht der Schießplatte 6 abgestimmt. Das Lösen und Fixieren der Schießplatte 6 auf dem Schießkopfmantel 4 geschieht nach dem Vorbeschriebenen, also durch einfache Schalterbetätigung. Die Auswechselzeit für eine Schießplatte mit der erfindungsgemäßen Vorrichtung ist somit um ein Vielfaches kürzer als mit den bisher verwandten, bekannten Schraubverbindungen.If the connection 25 leading to the annular groove 24 is now connected to a vacuum pump and this is put into operation, a vacuum is formed in the rough sealed by the seals 23, which causes the shooting head plate 6 to be pressed against the shooting head jacket 4 or the sand guide insert 5 leads. The firing plate can be released again by switching off the vacuum pump and admitting air through the connection 25. The vacuum surface encompassed by the sealing elements 23 or the annular groove 24 is matched to the weight of the firing plate 6. The shooting plate 6 is loosened and fixed on the shooting head jacket 4 according to what has been described above, that is to say by simply operating a switch. The replacement time for a firing plate with the device according to the invention is thus many times shorter than with the previously known screw connections.

Neben der hier im Ausführungsbeispiel in den Fig. 1 und 2 dargestellten ringförmig umlaufenden Ringnut 24 sind in anderen Ausgestaltungen der Erfindung andere Arten von Ausnehmungen konstruierbar, z. B. mehrere unabhängig voneinander umlaufende Nuten 24, die gegeneinander durch Dichtungen 23 abgedichtet sind und somit z. B. gegen Undichtigkeiten einzelner Dichtungen 23 unanfälliger sind. Möglich sind weiterhin Ausnehmungen, die nicht ringförmig umlaufen, sondern die Stirnfläche 12 des Flansches 21 in gegeneinander abgegrenzten Sektoren überdecken oder teilweise überdecken. Ebenso kann die Nut auch auf der der Stirnfläche 12 des Befestigungsflansches 21 des Schießkopfmantels 4 gegenüberliegenden Randfläche der Schießplatte 6 angebracht sein, was zu einer, wenn auch minimalen Gewichtseinsparung der Schießplatte 6 führen würde.In addition to the circular circumferential shown here in the embodiment in FIGS. 1 and 2 In other embodiments of the invention, annular groove 24 can be constructed with other types of recesses, e.g. B. several independently circumferential grooves 24 which are sealed against one another by seals 23 and thus z. B. against leaks of individual seals 23 are less susceptible. Recesses are also possible which do not run in a ring shape, but rather cover or partially cover the end face 12 of the flange 21 in sectors which are delimited from one another. Likewise, the groove can also be provided on the edge surface of the shooting plate 6 opposite the end face 12 of the fastening flange 21 of the shooting head casing 4, which would lead to a, albeit minimal, weight saving of the shooting plate 6.

In Fig. 3 ist als andere Art einer Haftverbindung zwischen Schießplatte 6 und Schießkopfmantel 4 eine Magnetverbindung dargestellt. Hierbei sind in den Befestigungsflansch 21 and seiner Stirnfläche 12 als Elektromagnet 26 wirkende elektrische Leitungen eingelassen, welche bei Stromdurchfluß über die Anschlußleitungen 27 ein Magnetfeld erzeugen, durch welches die aus ferromagnetischem Material bestehende Schießplatte 6 angezogen wird. Es ist hierbei nicht notwendig, daß die gesamte Schießplatte 6 aus ferromagnetischem Material besteht, sondern es reicht, wenn wenigstens der Randbereich, welcher gegenüber der Stirnfläche 12 des Schießkopfmantels 4 zur Anlage kommt, magnetisierbar ist.A magnetic connection is shown in FIG. 3 as another type of adhesive connection between the shooting plate 6 and the shooting head jacket 4. Electrical lines acting as electromagnet 26 are embedded in the mounting flange 21 on its end face 12 and generate a magnetic field when current flows through the connecting lines 27, by means of which the shooting plate 6, which is made of ferromagnetic material, is attracted. It is not necessary here for the entire shooting plate 6 to be made of ferromagnetic material, but it is sufficient if at least the edge area which comes into contact with the end face 12 of the shooting head casing 4 can be magnetized.

Eine derartige Magnetverbindung ist vor allem dann vorteilhaft, wenn beim Produktionsprozeß die Dichtungen 24 eines Vakuumhaftsystems leicht beschädigt werden können.Such a magnetic connection is particularly advantageous if the seals 24 of a vacuum adhesive system can easily be damaged during the production process.

Die zum Schießplattenwechsel erforderliche Arbeitszeit kann durch die in den Ausführungsbeispielen dargestellten konstruktiven Vereinfachungen weiter verkürzt werden. In den Fig. 1 bis 3 weist der Schießkopf eine zur Schießplatte 6 hin offene Ausnehmung auf, in der ein Sandführungseinsatz 5 insbesondere bündig mit den Anlageflächen 12 des Flansches 21 des Schießkopfes 15 paßt.The working time required for changing the firing plate can be further reduced by the design simplifications shown in the exemplary embodiments. 1 to 3, the shooting head has a recess which is open towards the shooting plate 6 and in which a sand guide insert 5 fits particularly flush with the contact surfaces 12 of the flange 21 of the shooting head 15.

Der Schießkopf 15 zerfällt damit konstruktiv in einen Schießkopfmantel 4 und den Sandführungseinsatz 5. Ein Abschrauben des gesamten Schießkopfes 15 zur Anpassung der Sandführung an die verschiedenen Schießplatten 6 erübrigt sich somit. Der Sandführungseinsatz kann nach dem Lösen der Schießplatte 6 in einfacher Weise aus dem Schießkopfmantel 4 herausgenommen werden. Die in den Ausführungsbeispielen zylindrische Ausnehmung des Schießkopfes 15, in welche der ebenso zylindrische Sandführungseinsatz 5 paßt, weist auf der der Schießplatte abgewandten Seite einen Boden 19 als ringförmige Anlagefläche für den Sandführungseinsatz 5 auf, die im Ausführungsbeispiel dem Randbereich der Sandführungsöffnung durch den Sandführungseinsatz 5 entspricht. Gegen den als ringförmige Anlagefläche ausgebildeten Boden 19 des Schießkopfmantels ist ein an dem Sandführungseinsatz 5 axial abgestützter Befestigungsflansch 7 des Schießrohres 2 in montierter Stellung andrückbar, so daß sich dieser Befestigungsflansch 7 in Gebrauchsstellung ausschließlich zwischen dem Sandführungseinsatz 5 und dem Boden 19 der Schießkopfausnehmung befindet (Fig.2). Mit dem Herstellen der Haftverbindung zwischen Schießplatte 6 und Schießkopfmantel 5 wird nun gleichzeitig der Sandführungseinsatz 5 durch den Druck der Schießplatte 6 an den Flansch 7 gedrückt. Es ist also nur noch die Haftverbindung zwischen Schießplatte 6 und Schießkopfmantel 4, welche sowohl die Schießplatte 6 wie auch den Sandführungseinsatz 5 und das Schießrohr 2 zu einer festen Einheit verbindet und weitere Verbindungselemente etwa zum Befestigen des Sandführungseinsatzes 5 am Schießkopf 15 überflüssig macht. Ein Lösen dieser Haftverbindung zwischen Schießplatte 6 und Schießkopfmantel 4 reicht demnach bereits aus, um sowohl den zylindrischen Sandführungseinsatz 5 wie auch das Schießrohre 2 aus der Kernschießmaschine auszubauen. Dadurch verkürzen sich in gewüunschter Weise die Arbeitszeiten für das Wechseln der Schießplatte ebenso wie die zur Reinigung des Schießrohres 2 früher notwendige Zeit für Demontagearbeiten ganz erheblich.The shooting head 15 thus breaks down constructively into a shooting head jacket 4 and the sand guiding insert 5. Unscrewing the entire shooting head 15 to adapt the sand guiding to the different shooting plates 6 is therefore unnecessary. The sand guide insert can be easily removed from the shooting head jacket 4 after the firing plate 6 has been released. The cylindrical recess of the shooting head 15 in the exemplary embodiments, into which the equally cylindrical sand guiding insert 5 fits, has a bottom 19 on the side facing away from the shooting plate as an annular contact surface for the sand guiding insert 5, which corresponds to the edge region of the sand guiding opening through the sand guiding insert 5 in the exemplary embodiment . A mounting flange 7 of the shooting tube 2, which is axially supported on the sand guide insert 5, can be pressed against the bottom 19 of the shooting head casing, which is designed as an annular contact surface, so that this mounting flange 7 is in the position of use exclusively between the sand guide insert 5 and the bottom 19 of the shooting head recess (FIG .2). With the establishment of the adhesive connection between the shooting plate 6 and the shooting head jacket 5, the sand guide insert 5 is now simultaneously pressed against the flange 7 by the pressure of the shooting plate 6. It is therefore only the adhesive connection between the shooting plate 6 and the shooting head jacket 4 which connects both the shooting plate 6 as well as the sand guiding insert 5 and the shooting tube 2 to a fixed unit and makes additional connecting elements, for example for fastening the sand guiding insert 5 on the shooting head 15, superfluous. A loosening of this adhesive connection between the shooting plate 6 and the shooting head jacket 4 is therefore sufficient to remove both the cylindrical sand guiding insert 5 and the shooting tubes 2 from the core shooting machine. As a result, the working times for changing the firing plate as well as the time previously required for cleaning the firing tube 2 for dismantling work are shortened considerably.

Wie Fig. 3 in einem weiteren Ausführungsbeispiel zeigt, kann auf den Befestigungsflansch des Schießrohres 2 verzichtet werden, wodurch sich eine noch einfachere Konstruktion ergibt. Das Schießrohr 2 wird hier einfach mit der Stirnfläche seines schießkopfseitigen Endes in eine ringförmige Nut 28 am Umfang der Sandführungsöffnung des Sandführungseinsatzes 5 gesteckt.As shown in FIG. 3 in a further exemplary embodiment, the fastening flange of the shooting tube 2 can be dispensed with, which results in an even simpler construction. The shooting tube 2 is simply inserted with the end face of its shooting head end into an annular groove 28 on the circumference of the sand guiding opening of the sand guiding insert 5.

Die Erfindung ist sowohl auf herkömmliche Schießkopfbefestigungssysteme wie auch auf weiter unten noch darzustellende, vereinfachte Befestigungssysteme anwendbar. Fig. 1 und Fig. 2 zeigen je ein Ausführungsbeispiel mit herkömmlicher Befestigungsart des Schießkopfes 15 am Fuß des Mantelrohres 3. Es handelt sich hier um einen Druckschraubenbefestigungsmechanismus, bei dem auf einen außenseitig konisch verbreiterten Rand 16 des Fußes des Mantelrohres 3 gerichtete Druckschrauben 17 den Schießkopf 15 mit dem Mantelrohr 3 verbinden. Hierbei dient die Fußfläche 3 a des konisch verbreiterten Mantelrohrfußes an seinem äußeren Rand als Auflagefläche zu seiner Befestigung am Schießkopfmantel 4 und in ihrem inneren Bereich als Anlagefläche für den Sandführungseinsatz 5 bzw. dem zwischen der Anlagefläche des Sandführungseinsatzes 5 und der Fußläche 3 a liegenden Schießrohrflansch 7 (Fig. 1).The invention is applicable both to conventional shooting head mounting systems and to simplified mounting systems to be shown below. 1 and 2 each show an exemplary embodiment with a conventional type of fastening of the shooting head 15 at the foot of the casing tube 3. This is a pressure screw fastening mechanism in which pressure screws 17 directed towards an externally conically widened edge 16 of the foot of the casing tube 3 are the shooting head 15 connect with the casing tube 3. Here, the foot surface 3a of the conically widened tubular casing foot serves on its outer edge as a support surface for its attachment to the shooting head casing 4 and in its inner area as a contact surface for the sand guide insert 5 or the shooting tube flange 7 lying between the contact surface of the sand guide insert 5 and the foot surface 3a (Fig. 1).

In Fig. 2 ist in weiterer Ausgestaltung der Erfindung in einem Ausführungsbeispiel eine vereinfachte Art der Befestigung des Schießkopfmantels 4 am Mantelrohr 3 dargestellt. Die innere Anlagefläche für den Sandführungseinsatz bzw. für den Flansch 7 des Schießrohres 2 wird hier durch den Bodenbereich 19 der Ausnehmung im Schießkopf 15 selbst gebildet und nicht mehr wie in Fig. 1 und 3 dargestellt von der Fußfläche 3 a des Mantelrohres 3. Das Mantelrohr 3 wird in diesem Ausführungsbeispiel auf der Außenseite des Schießkopfmantels aufgesetzt, wobei das Schießrohr 2 zu seiner Anlagefläche im Schießkopf hin durch eine Durchtrittsöffnung 20 durch den Schießkopfmantel hindurchgeführt wird. Das Schießrohr 2 kann hier wie auch bei der herkömmlichen Befestigungsart mit Hilfe von Druckschrauben entweder mit einem Flansch zwischen Sandführungseinsatz 5 und innerer Anlagefläche im Schießkopf 15 eingeklemmt oder in eine Nut 28 des Sandführungseinsatzes 5 wie vorbeschrieben eingesteckt werden.In a further embodiment of the invention, FIG. 2 shows, in one exemplary embodiment, a simplified manner of fastening the shooting head casing 4 to the casing tube 3. The inner contact surface for the sand guide insert or for the flange 7 of the shooting tube 2 is formed here by the bottom region 19 of the recess in the shooting head 15 itself and no longer, as shown in FIGS. 1 and 3, by the base surface 3a of the jacket tube 3. The jacket tube 3 is placed on the outside of the shooting head shell in this exemplary embodiment, the shooting tube 2 being guided through its through-hole 20 through the shooting head jacket to its contact surface in the shooting head. The shooting tube 2 can here as with the conventional type of attachment with the help of Pressure screws are either clamped with a flange between the sand guide insert 5 and the inner contact surface in the shooting head 15 or inserted into a groove 28 of the sand guide insert 5 as described above.

Die topfartige Form des Schießkopfmantels in diesem Ausführungsbeispiel erlaubt im Gegensatz zur herkömmlichen Befestigungsart zur Verbindung des Schießkopfmantels 4 mit dem Mantelrohr 3 von der Ausnehmung des Schießkopfmantels 4 für den Sandführungseinsatz 5 her einführbare, parallel zur Achse des Schießrohres 2 verlaufende, in das Mantelrohr 3 formschlüssig eingreifende Schrauben 22 zu verwenden. Durch diese durch den Boden 19 des Schießkopfmantels 4 durchgetriebenen Schrauben erledigt sich sowohl das Problem der Zentrierung des Rohrmantels 3 auf den Schießkopfmantel 4 sowie auch das Problem der Verschmutzung dieser Schraubverbindungen. Durch ihre Innenlage sind sie vor Verschmutzungen, die ihre Gängigkeit beeinflussen könnten, geschützt.The pot-like shape of the shooting head jacket in this exemplary embodiment, in contrast to the conventional fastening method for connecting the shooting head jacket 4 to the jacket tube 3, can be inserted from the recess of the shooting head jacket 4 for the sand guiding insert 5, runs parallel to the axis of the shooting tube 2 and engages in the jacket tube 3 in a form-fitting manner Use screws 22. These screws, which are driven through the bottom 19 of the shooting head casing 4, solve both the problem of centering the tubular casing 3 on the shooting head casing 4 and the problem of contamination of these screw connections. Their inner layer protects them from dirt that could affect their ability to move.

In vieler Hinsicht günstig wirkt sich eine Verwendung von Kunststoff als Werkstoff für den Sandführungseinsatz 5 aus. Denn erstens werden durch die Gewichtsersparnisse gegenüber anderen Materialien die Halte kräfte, die für die Befestigung der Schießplatte und das Halten des Sandführungseinsatzes in der Ausnehmung erforderlich sind, verkleinert, so daß die Haftverbindungen entsprechend kleiner und weniger kostenaufwendig dimensioniert werden können. Auf der anderen Seite gewährleistet Kunststoff eine gute Abdichtung an den Anlageflächen und ist in seiner Herstellung preiswert.In many respects, the use of plastic as a material for the sand guide insert 5 has a favorable effect. Because firstly, the weight savings compared to other materials, the holding forces, which are required for the attachment of the shooting plate and the holding of the sand guide insert in the recess, are reduced, so that the adhesive connections can be dimensioned correspondingly smaller and less costly. On the other hand, plastic ensures a good seal on the contact surfaces and is inexpensive to manufacture.

Als Haftverbindung zwischen Schießplatte 6 und Schießkopfmantel 4 kommt nicht nur, wie in den Ausführungsbeispielen dargestellt, entweder eine Vakuumhaftverbindung oder eine Magnethaftverbindung in Frage, sondern beide Arten von Haftverbindungen lassen sich in verschiedenster Weise miteinander kombinieren.The adhesive connection between the shooting plate 6 and the shooting head jacket 4 is not only a vacuum adhesive connection or a magnetic adhesive connection, as shown in the exemplary embodiments, but both types of adhesive connections can be combined with one another in a wide variety of ways.

Durch die Erfindung und ihre Ausgestaltungen wird die zum Wechseln der Schießplatte notwendige Arbeitszeit auf weniger als 20 Sekunden verkürzt. Der wesentliche Vorteil der Erfindung und seiner Ausgestaltungen liegt darin, daß zum Auswechseln bzw. Reinigen der Einsätze nur noch die schnelle Haftverbindung gelöst und wieder hergestellt werden muß. Ein Wechsel des gesamten Schießkopfsystems wird somit überflüssig. Durch die bei der Vakuumverbindung sowie bei der Magnethaftverbindung auftretenden gleichmäßigen über den gesamten Umfang der Schießplatte 6 verteilten Haftkräfte wird auch die Gefahr eines seitlichen Austretens von Schießmaterial verringert. Der konstruktive Aufwand, den die Erfindung voraussetzt, ist diesen Vorteilen gegenüber äußerst gering.The invention and its embodiments reduce the working time required to change the firing plate to less than 20 seconds. The main advantage of the invention and its refinements is that only the quick adhesive connection has to be loosened and restored to replace or clean the inserts. A change of the entire shooting head system is therefore unnecessary. As a result of the uniform adhesive forces which occur in the vacuum connection and in the magnetic adhesive connection and are distributed over the entire circumference of the shooting plate 6, the risk of a lateral escape of shooting material is also reduced. The design effort, which the invention presupposes, is extremely low compared to these advantages.

Claims (14)

1. A device for blowing core sand by compressed air into core boxes for a core shooter, including a shooting head, between shooting head and core box a blowing plate which is adapted to be detachably fixed onto the shooting head, and further including a blowing tube or similar feed for the sand leading to the shooting head, the shooting head having on the side thereof facing the blowing plate a mounting flange or the like to which the corresponding edge area of the blowing plate is connectable in the position for use, characterized in that a releasable connection by adhesion is provided to connect the flange (21) of the shooting head (15) to the blowing plate (6).
2. The device as claimed in claim 1, characterized in that a clamping connection through vacuum is provided as the releasable connection by adhesion.
3. The device as claimed in claim 1 or claim 2, characterized in that at least one preferably flat annular groove (24) or similar recess runs round the mounting flange (21) of the shooting head (15) and has its edges surrounded by seals (23) projecting particularly relative to the surface of the mounting flange, and that the recess(es) (24) located on the mounting flange (21) has (have) a connection (25) to a source of vacuum, particularly to a vacuum pump.
4. The device as claimed in any one of claims 1 to 3, characterized in that a magnetic connection is provided as the releasable connection by adhesion between shooting head and blowing plate.
5. The device as claimed in claim 4, characterized in that at least one electromagnet (26) is inserted in the mounting flange (21) of the shooting head (15) and the blowing plate (6) consists of ferromagnetic material at least in the area opposite the mounting flange (21).
6. The device as claimed in claim 4 or claim 5, characterized in that the electromagnet(s) (26) have turns of electrically conductive material which run round the contact surface (21) of the shooting head (15) and are preferably at least partly sunk in said contact surface (12).
7. The device as claimed in any one of claims 1 to 6, characterized in that the shooting head (15) has a recess open towards the blowing plate (6), the insert (5) for guiding sand fitting in said recess in a manner particularly so as to be flush with the surfaces (12) contacting the blowing plate (6).
8. The device as claimed in any one of claims 1 to 7, characterized in that the vacuum connection is provided between an outer mounting flange (21) running round the recess for the insert (5) for guiding sand and the corresponding contact area of the blowing plate (6).
9. The device as claimed in any one of claims 1 to 8, characterized in that the preferably cylindrical recess of the shooting head (15) has, on the side averted from the blowing plate (6), a base (19) or the like as a ring-shaped contact surface for the insert (5) for guiding sand, said contact surface corresponding approximately to the edge area of an opening guiding sand through the insert (5), the blowing tube (2) having a stop or the like, preferably in the form of a mounting flange (7), which is axially supported against the insert (5) and is adapted to be pressed against said contact surface in the position for use, so that in the position for use said mounting flange (7) is located exclusively between the insert (5) and the base (19) of the recess of the shooting head.
10. The device as claimed in any one of claims 1 to 9, characterized in that the contact surface of the insert (5) for guiding sand in the shooting head (15) is formed by an edge of a jacket tube (3) of the core shooting machine (1), said edge preferably being widened in a shoulder-like manner for fixing the shooting head (15).
11. The device as claimed in any one of claims 1 to 10, characterized in that the inner contact surface for the insert (5) for guiding sand is formed by a base area (19) which belongs to the shooting head (15) itself and is averted from the blowing plate (6), preferably in order to grip the mounting flange (7) of the blowing tube (2) between shooting head (15) and insert (5), a jacket tube (3) of the core shooting machine (1) being attachable and fixable to the outside of said base area, said base (19) or the like of the shooting head (15) having an opening (20) for the blowing tube (2).
12. The device as claimed in any one of claims 1 to 11, characterized in that fasteners (22), preferably screws, which can be inserted from the recess of the shooting head (15) for the insert (5) for guiding sand, extend parallel to the axis of the blowing tube (2) and engage with a form fit in the jacket tube (3), are provided to connect the shooting head (15) to the jacket tube (3).
13. The device as claimed in any one of claims 1 to 12, characterized in that the insert for guiding sand, which is disposed In an exchangeable condition between blowing plate (6) and shooting head (15) and in the position for use is held by the forces adhering the blowing plate (6) to the shooting head (15), is made of plastic.
14. The device as claimed in any one of claims 1 to 13, characterized in that the blowing tube (2), at the end thereof in the direction of the shooting head, is attached with the end face of its wall onto the insert (5) for guiding sand or in a groove (28) mating the end of the blowing tube.
EP87109855A 1986-08-08 1987-07-08 Blowing-in device for a core shooter Expired EP0257257B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109855T ATE46842T1 (en) 1986-08-08 1987-07-08 SHOOTING DEVICE ON A CORE SHOOTING MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3626994A DE3626994C1 (en) 1986-08-08 1986-08-08 Shooting device on a core shooter
DE3626994 1986-08-08

Publications (3)

Publication Number Publication Date
EP0257257A2 EP0257257A2 (en) 1988-03-02
EP0257257A3 EP0257257A3 (en) 1988-06-08
EP0257257B1 true EP0257257B1 (en) 1989-10-04

Family

ID=6307014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109855A Expired EP0257257B1 (en) 1986-08-08 1987-07-08 Blowing-in device for a core shooter

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US (1) US4815517A (en)
EP (1) EP0257257B1 (en)
AT (1) ATE46842T1 (en)
DE (2) DE3626994C1 (en)
ES (1) ES2011637B3 (en)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE3736967C1 (en) * 1987-10-31 1989-03-30 Harry Post Lining plate for the mould space of boxless moulding machines
DE4109382A1 (en) * 1991-03-21 1992-09-24 Gisag Ag Giesserei Masch SHOOTING DEVICE FOR MOLDING MACHINES, IN PARTICULAR CORE SHOOTING MACHINES
ES1045359Y (en) * 2000-02-15 2001-02-16 Loramendi Sa BLOWING HEAD FOR MALE BLOWING MACHINES
WO2009074838A1 (en) * 2007-12-10 2009-06-18 Disa Industries A/S Moulding chamber arrangement for a mould-string plant
CN102764857A (en) * 2012-07-11 2012-11-07 浙江省机电设计研究院有限公司 Device for quickly replacing sand-shooting plate in sand-lined iron mould
CN105945229B (en) * 2016-07-06 2017-09-29 安徽莱恩电泵有限公司 A kind of New-type cast steel pump housing casting mold structure
CN106424597B (en) * 2016-11-15 2018-09-25 盐城市汉铜智能铸造设备有限公司 Penetrate the full-automatic sand casting moulding machine sandblasting plate of sand up and down
CN109773136B (en) * 2019-03-14 2020-07-17 安徽应流集团霍山铸造有限公司 Method for preventing small runner sand core of pump body type casting from cracking

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US2611938A (en) * 1949-06-15 1952-09-30 Hansberg Fritz Machine for ramming foundry cores by means of compressed air
US2705821A (en) * 1951-05-03 1955-04-12 Axel H Peterson Sand blowing head for core machines
BE535648A (en) * 1954-02-16
DE930104C (en) * 1954-02-16 1955-07-11 Fritz Hansberg Machine for the production of foundry cores and for filling molding sand into molding boxes using compressed air
CH372546A (en) * 1962-01-11 1963-10-15 Bobst Fils Sa J Method of auxiliary fixing of the tool of a platen press in the working position against the upper base and device for implementing this method
US4140171A (en) * 1977-08-08 1979-02-20 Ashland Oil, Inc. No bake blower apparatus for making sand cores
SU869937A1 (en) * 1979-12-29 1981-10-07 Всесоюзный Научно-Исследовательский Институт Литейного Машиностроения,Литейной Технологии И Автоматизации Литейного Производства /Вниилитмаш/ Nozzle for sand slinging machine
US4460032A (en) * 1982-01-25 1984-07-17 Pettibone Corporation Method and apparatus for blowing cores etc. using a plunger-cleaned blow box suitable for quick-set sand

Also Published As

Publication number Publication date
EP0257257A2 (en) 1988-03-02
US4815517A (en) 1989-03-28
EP0257257A3 (en) 1988-06-08
DE3760653D1 (en) 1989-11-09
DE3626994C1 (en) 1987-12-10
ATE46842T1 (en) 1989-10-15
ES2011637B3 (en) 1990-02-01

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