DE8606530U1 - Device for making casting molds - Google Patents

Description

BUDERUS AKTIENGESeLiSCHAfV "**" "

G 10-140 TT / P-be-st

Device for making casting molds

The innovation relates to a device for producing \

Casting molds by means of a _{jsE on the surface of the molding material}

acting DruCkiifipuises. 1

In addition to the usual methods of compacting molding sand i by pressing and / or vibrating, the so-called? Impulse method has become known which is based on a brief action of air supplied under high pressure on the molding material located in the molding box. After i this principle working end molding plants have above J

of the machine table, which has a mold model and a mold I

box, a compressed air tank and a sand bunker '

on. The molding box half is filled with molding sand via the sand bunker filled and then the compressed air tank suddenly opened via a pulse valve, so that the compressed air wave applied to the molding sand surface and the molding sand

compacted in the molding box. ;

In the known devices, the sand bunker or t

the compressed air tank during the molding process by against f side movement in each case to the required position

be brought over the molding table. The innovation is the \

The object of the invention is to design the molding device so fj

that the necessary movements of the machine table, sand bunker |

and compressed air tanks to each other reduced to a minimum J and at the same time the structure of the machine is simplified.

To solve this problem, the in the characterizing Proposed part of the protection claim specified features.

Due to the mutual arrangement of the compressed air tank and the height-adjustable sand bunker according to the invention it is possible to fill the molding box driven under the sand bunker with sand and then close it without changing its position condense.

IrI of the drawing is an embodiment of the innovation shown. Show it:

Fig. 1 is a vertical section of the device in front view

Fig. 2 is a vertical section of the device in a side view

3 shows a horizontal section in the area of the sand outlet opening from the sand bunker

Fig. 4 Functional diagram.

Via the machine table 1, which can be raised and lowered, with the model carrier 2, a molding box half can be moved over the roller conveyor 3. When lifting the machine table 1 this takes

with

the molding box half 4 ^ iS this on the stop bar of the filling frame attached to the bottom of the compressed air tank 6 is tight. The compressed air tank 6 surrounds the sand bunker all around, whereby it is statically constructed so that it forms a load-bearing part of the machine frame 9.

■ « i 9 es β * * * <

The sand bunker is at the bottom by a special slot lock 10 completed. The slot shutter 10 consists of widths lying next to one another and parallel to one another Slots 11 which can be opened or closed by a slide 12 with corresponding counter slots. Between the slots 11 8 sand guide hoods 13 are installed in the sand bunker, which ensure that the molding sand in the molding box flows. The lower part of the sand guide hoods is formed by a partition 15 as a compressed air duct 14 educated. The compressed air ducts 14 lead to the outlet openings 16 of the compressed air tank 8 a pulse valve 17 is assigned to each compressed air duct 14. The impulse valves 17 arranged on both sides (e.g. 6 pieces each) are controlled together. Because of the low valve masses to be moved, the impulse valves can be opened quickly together possible.

The sand bunker 8 is adjustable in height so that cter distance between stop bar 5 and slide 12 each can be varied according to the desired sand height.

The slide 12 closes the sand outlet slots in one position 11 of the sand bunker and opens the compressed air ducts to the molding sand surface while it is reversed in the other sliding position. The simple mode of operation should be based on the functional diagram of FIG be presented, it being particularly advantageous that the molding box does not change its density compared to the filling frame during the sand filling and the impulse compaction. The individual work steps are as follows

-A-

a) Starting position

Sand vessel filled

Molding box resting on a roller bracket Impulse air tank filled. Focal plane shutter closed

b) Start up

Molding box driven against machine frame

Sealing between frame and molding box

Focal plane shutter closed

Move down the sand vessel (preselected according to the sand filling quantity)

c) sand filling

Focal plane shutter open

F d) pulse preparation

Focal plane shutter closed

Raise the sand vessel to the starting position

i! e) Impulse Earnings

P Air impulse through flash opening and closing of the special valves

Vent the mold frame

'f) end position

Fill the model with the molding box lowered on the runway with a sand jar

Fill the impulse air tank

Claims (10)

BUDERUS AKTIENGES'ELLS'CHAF't G 10-140 TT / P-be-st protection claims 1. Device for producing casting molds by means of a pressure pulse acting on the surface of the molding material an expanding gaseous medium consisting of a above a machine table for holding a model carrier and a molding box part arranged compressed air tank, which on the one hand with a compressed air source and on the other hand Can be connected to the mold space via impulse valves, as well as from a sand bunker with an upstream filling frame, characterized in that the compressed air tank (6) the Sandüunker (8) as a statically effective part of the machine frame (9) surrounds. 2. Device according to claim 1, characterized in that the sand bunker (8) for pre-metering the sand filling is designed to be adjustable in height. 3. Device according to claim 1, and / or 2, characterized in that the filling frame (7) connected upstream of the sand bunker (8) is mounted on the compressed air tank (6) and forms the expansion space. 4. Device according to one of claims 1 to 3, characterized in that the sand bunker (8) is parallel adjacent slots (11) as sand outlet openings which can be closed by a slide (12). 5. Apparatus according to claim 4, characterized in that sand guide hoods (13) are arranged in the sand bunker (8) between the slots (11). 6. Device according to one of claims 1 to 5, characterized in that for the formation of lower compressed air ducts (14) the sand guide hoods have partition walls (15). 7. Device according to one of claims 1 to 6, characterized in that the partition walls (15) to the sand bunker center line are inclined. 8. Device according to one of claims 1 to 7, characterized in that the slide (12) with slot-shaped Recesses are provided, which can optionally be the slots (11) or the underside of the compressed air channels (14) release. 9. Device according to one of claims 1 to 8 characterized in that in the compressed air tank (6) on both sides next to the sand bunker (8) several jointly controlled impulse valves (1?) Are arranged. 10. Device according to one of claims 1 to 9, characterized in that the pulse valves (17) in the area the compressed air ducts (14) are arranged.