DE102018110993A1 - Apparatus and process for the production of cores for foundry purposes - Google Patents

Abstract

Apparatus, in particular shooting plate, for the production of cores for foundry purposes, comprising a plurality of shooting nozzles for feeding core sand mixture to a core box for producing at least one core and at least one closure device for molding and / or airtight sealing of one or more of the plurality of shooting nozzles.

Description

Field of the invention

The invention relates to an apparatus and a method for producing cores for foundry purposes, the apparatus comprising a plurality of shooting nozzles for feeding core sand mixture to a core box, and wherein the core box is configured to produce a plurality of cores.

background

In the production of sand cores after the core shooting process, the core molds (core boxes) are partially carried out for the production of several different cores, which will be used together in the later casting. These core boxes are often referred to as "family core boxes." For contour reasons, the different core types can be very different and have different core production error rates.

These different error rates lead to different production reject rates in the production process. Therefore, to produce complete core sets for a casting, more cycles of production have to be completed with the core box in question in order to have enough cores for the core type (s) with high reject rates. The excessively manufactured cores must be disposed of. This creates additional costs. The core boxes are also worn beyond the necessary extent.

It is therefore desirable to avoid overproduction of cores.

In order to prevent core sand from hardening in the shooting nozzles and subsequently having to be removed, the shooting nozzles are cleaned after each firing process. However, when shooting nozzles are to be closed, it is known to let them dry for the purpose of closing. By selectively omitting the cleaning, those shooting nozzles are then allowed to dry which are assigned to cores which do not have to be re-produced as a result of defects.

The method has the disadvantage that in the shooting nozzles each core sand remains, which must be laboriously removed on the one hand and on the other hand can not be used.

The invention therefore has for its object to provide a device and a method which eliminates or reduces these disadvantages.

Brief description of the invention

This object is achieved by the invention specified in the independent claims. Advantageous embodiments can be found in the dependent claims.

The invention provides a device, in particular a shooting plate for the production of cores for foundry purposes, comprising a plurality of shooting nozzles for feeding core sand mixture to a core box for producing at least one core, and at least one closure device for molding and / or airtight sealing one or more the majority of shooting nozzles.

By the closure device those shooting nozzles that are not needed in a production cycle, air-tight and / or closed form-tight. This ensures that in the unused, closed shooting nozzles from the outset no dried core sand arises, which would later be laboriously removed. Due to the air- and / or molding-tight closure of the shooting nozzles namely prevents core sand, which remains in the closed shooting nozzles, dries.

The core box can be designed to produce a plurality of cores, wherein each of the cores to be produced is associated with at least one of the shooting nozzles. The invention makes it possible to selectively leave open only those shooting nozzles, which are assigned to certain cores, ie, for example, those cores from which a higher number of pieces is required, or whose production is to be repeated, because in a previous cycle errors have occurred. This prevents that additional, actually unneeded cores are generated, which later may need to be disposed of.

In one embodiment of the invention, the closure device can be operated by a control unit. The shutter of the shooting nozzles can be automated by the control unit. This can be done in the context of a monitoring unit, wherein the monitoring unit monitors the state of the shooting nozzles, the assignment of shooting nozzles to cores and / or the quality of the cores generated. The intervention of an operator is thereby reduced.

In one embodiment of the invention, the closure device comprises a slider assembly, wherein the slider assembly is driven by a hydraulic or mechanical or pneumatic or electric linear or rotary drive or is operable. This allows the required closing forces, which are required for about the tightness generated. Furthermore, the drive of the slider device can be controlled by the control unit.

In one embodiment of the invention, the closure device comprises a seal for the material and / or airtight sealing of the shooting nozzles. The seal permits certain tolerances in the positioning of the closure device relative to the shooting nozzles. In addition, the seal prevents jamming of the closure device.

In one embodiment of the invention, the device comprises a cleaning device for cleaning the nozzles, in particular by blowing out the closed shooting nozzles in a collecting container. The removal of the residual sand prevents the curing of the residues. If the cleaning takes place directly after the previous manufacturing step, the core sand accumulating during the cleaning can be collected in a collecting container and reused if necessary. The cleaning by means of blowing out by means of compressed air / compressed gas is particularly gentle. In order to prevent the core sand from curing when it is blown out, it may be blown out with an inert gas or the blow-off gas may be moistened and / or contain solvent.

According to another aspect of the invention, there is provided a method of making foundry cores by means of a firing plate, the firing plate having a plurality of firing nozzles, the method comprising selectively sealing at least a first gun tip of the firing plate, and supplying core sand mixture a core box via one or more unsealed second shooting nozzles of the shooting plate for the production of at least one core.

By closing the at least first shooting nozzle is prevented that unneeded cores, namely cores, which could already be prepared properly in a previous passage, re-shot and then disposed of as a committee.

In one embodiment, the method includes determining if one or more of the cores in the core box are faulty, and closing the at least one first shooting nozzle, wherein the at least one first shooting nozzle is associated with the non-defective core (s). The two steps can be taken over automatically by a control and / or control device. This allows the production process to be automated. For further automation, the replicated core can also be removed from the core box by a removal device and fed to further process stages.

In one embodiment, the method comprises cleaning the at least one first shooting nozzle. By cleaning it is avoided that core sand remains in the shooting nozzles when the nozzles are closed, and the later may need to be laboriously removed. The cleaning can be done by means of compressed air / compressed gas via nozzles.
In one embodiment, the cleaning comprises blowing out the at least one first shooting nozzle into a collecting container. Blowing is gentle on materials and inexpensive. Core sand collected in the catch bin can be recycled and reused.

In one embodiment, the closure is effected by a slide arrangement, wherein the slide arrangement is hydraulically or electrically or pneumatically or mechanically drivable. The slider assembly and thus the closure device is thus controlled by a control unit and can be used in an automated process without intervention by an operator.

According to a further aspect of the invention, a control unit is provided, wherein the control unit is set up and designed to control a device according to the invention in accordance with a method according to the invention.

list of figures

• Die 1 eine beispielhafte Anordnung zur Herstellung von Kernen mit einer Vorrichtung gemäß der Erfindung;
• die 2 eine beispielhafte Schießdüse einer Vorrichtung gemäß der Erfindung;
• die 3 eine beispielhafte Ausgestaltung der Schieberanordnung gemäß der Erfindung.

Hereinafter, exemplary embodiments of the invention are described in more detail with reference to the accompanying drawings. Show it:

• The 1 an exemplary arrangement for the production of cores with a device according to the invention;
• the 2 an exemplary shooting nozzle of a device according to the invention;
• the 3 an exemplary embodiment of the slider assembly according to the invention.

figure description

The 1 shows an exemplary arrangement for the production of cores with a device 1 according to an embodiment of the invention. The device comprises a shooting head 2 , The shooting head 2 includes several shooting nozzles 3 , The shooting nozzles 3 each comprise a closure device 4 , The closure devices 4 are individually via one or more drives 5 operable to the shooting nozzles 3 to close.

The shooting nozzles 3 are to a core box 6 oriented and serve to supply core sand to corresponding core shapes 7 in the core box 6 , The core box 6 includes several different core shapes 7 , The core forms 7 Due to their different forms in the manufacturing process lead to different reject rates.

In the manufacturing process core sand (not shown) through the shooting nozzles in a first cycle 3 into the core forms 7 of the core box 6 supplied to make a family of cores. If one core of the family does not meet the quality requirements, it must be reproduced in a second work cycle. This will be the same core box 6 used. To prevent again core sand to the core forms 7 supplied, whose cores meet the quality requirement, the relevant shooting nozzles 3 through the closure device 4 locked. Only the shooting nozzle 3 whose core needs to be rebuilt remains open to re-core sand to the corresponding core shape 7 supply.

2 shows an exemplary shooting nozzle 3 a device 1 according to an embodiment of the invention. The shooting nozzle 3 is at the shooting head 2 arranged and includes the closure device 4 , The closure device 4 includes a slider 8th who the shooting nozzle 3 closes form-material and airtight. The slider 8th is by the drive 5 actuated. The shooting nozzle 3 includes exhaust nozzles 9 which are arranged below the slider and by means of which core sand, between the slider and the core box 6 in one end area 10 the shooting nozzle 3 remains, in a suitable collecting container (not shown) can be blown out.

The 3 shows an exemplary embodiment of the slider 8th in a top view. The slider 8th is semicircular at one end and includes a seal 11 , The seal 11 improves the positioning and movement tolerances of the slider 8th relative to the shooting nozzle 3 and contributes to the fact that the shooting nozzle can be closed air-tight or mold-tight, even if mold residues on the slide 8th or attach the shooting nozzle.

LIST OF REFERENCE NUMBERS

1

contraption

2

shooting head

3

shooting nozzles

4

closure device

5

drive

6

core box

7

core molds

8th

pusher

9

air nozzles

10

End of the shooting nozzle

11

poetry

Claims (12)

Apparatus, in particular shooting plate, for the production of cores for foundry purposes, comprising: a plurality of shooting nozzles for feeding core sand mixture to a core box for producing at least one core; at least one closure device for molding and / or airtight sealing of one or more of the plurality of shooting nozzles. Device after Claim 1 , wherein the closure device is automatically, by a control unit, operable. Device according to one of the preceding claims, the closure device comprising: a slider assembly, wherein the slider assembly is driven or actuated by a hydraulic or mechanical, or pneumatic or electric linear or rotary drive. Device after Claim 3 wherein the closure device comprises a seal for molding and / or airtight sealing of the shooting nozzles. Device according to one of the preceding claims, comprising a cleaning device, for cleaning the shooting nozzles, in particular by blowing out the closed shooting nozzles in a collecting container. Device after Claim 5 comprising at least one blowing nozzle for blowing out the closed shooting nozzles, wherein the at least one blowing nozzle is arranged in an end region of the shooting nozzles between an opening of the shooting nozzles and the closing device. A method of manufacturing cores for foundry purposes by means of a firing plate, the firing plate comprising a plurality of firing nozzles, the method comprising: selective air- and / or molding-tight closing of at least one first shooting nozzle of the shooting plate; and Feeding core sand mixture to a core box via one or more unsealed second guns of the firing plate to produce at least one core. Method according to Claim 7 comprising determining whether one or more of the cores in the core box are faulty; and closing the at least one first shooting nozzle, wherein the at least one first shooting nozzle is assigned to the one or more non-defective cores. Method according to Claim 7 or 8th comprising: cleaning the at least one first shooting nozzle. Method according to Claim 9 comprising cleaning: blowing core sand from the at least one first shooting nozzle into a collecting container. Method according to one of the preceding claims, wherein the closure is effected by a slide arrangement, wherein the slide arrangement is hydraulically or electrically or pneumatically or mechanically drivable. Control unit, set up and trained, a device according to the Claims 1 - 6 according to a method according to Claims 7 - 11 to control.

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