DE1016905B - Automatic molding and core blowing machine - Google Patents

Description

GERMAN

The invention relates to a further embodiment of the molding and core blowing machine according to patent 860,241 with a prismatic, rectangular cross-section that can be rotated and lifted around a horizontal axis Model plate carrier, the four sides of which can be used as model tables and for fastening the molding or core boxes serve and each mold or core box attached to it one after the other as it rotates brings it into four rotary positions offset by 90 °. In the first position, a cover plate is placed on the box placed, and in the second position takes place after lifting the carrier up to the blow head of the Machine filling the mold or core box, while in the third position so far no special Treatment took place and in the fourth position the finished form is lowered.

It is already known to add additives to the sand which, when CO _{2 is} introduced, bring about a rapid solidification of the mold or the core through a chemical reaction.

The aim of the further embodiment of the machine according to the invention according to the main patent is now to _{switch this CO 2} hardening into the automatic operation of the machine. According to the invention, this is achieved in that CO ₂ supply lines are arranged in the model plate carrier, which open out under the model plates provided with slots and are controlled by a rotary valve so that for CO ₂ hardening of the molds in the working cycle after the blow molding CO ₂ into the is introduced with suitable additives provided molds. In this way, the holding time of the model plate carrier, which is necessary anyway, is used in the above-mentioned third rotary position. The inclusion of CO ₂ hardening in the automatic sequence of the machine's work steps does not result in any longer working hours.

If one assumes that the work cycle of such a machine takes 15 to 20 seconds to the The time required to solidify the blown mold or core is only 3 to 5 seconds, so it is recommended to avoid unnecessary losses of carbon dioxide gas a z. B. electrical timer to provide, which the introduction of the carbon dioxide gas in each case to a fraction of the Holding time of the model plate carrier limited.

The design of such a time switch mechanism can be any. For example, everyone can Further rotation of the model plate carrier by 90 ° will overrun an electrical contact, which is a Solenoid valve opens, the supply of carbon dioxide gas to the one in the third position The mold or core box releases, while a built-in timer relay opens the valve after it has been switched on.

Automatic molding and core blowing machine

Addendum to patent 860 241

Applicant:

Machine and tool factory cable

Vogel & Schemmann A.-G.,

Hagen (Westf.) - Cable

Franz Steinhoff, Hagen (Westphalia) - Cable,
has been named as the inventor

line brings the required amount of carbon dioxide gas to close again.

An example embodiment of a designed for carrying out the method according to the invention The drawing in FIG. 1 shows the blow molding machine according to patent 860 241.

1 is the model plate carrier that can be rotated in four positions around a horizontal axis the four sides of which models 2 are attached with molding and core boxes 3. While on the in the position I located molding box a cover plate 4 is placed, this molding box with his Cover plate after further rotation of the carrier 1 in the direction of arrow 5 in the upper position II through Lifting the carrier 1 pressed against the blow head 6, whereupon the box 3 is blown full of sand.

After further rotation by 90 °, the mold or core box under consideration moves into position III, in which carbon dioxide gas is introduced into the box through channels 7 of the model, namely, as described above, expediently only during a fraction of the dwell time of the molding or core box in position III. The channels 7 terminate in the above-mentioned slot nozzles during the feed of the carbon dioxide gas from the bottle 8 through the axis of rotation 9 of the carrier 1, the radial channel 10 and the rotary valve 11 takes place, which rotates with the carrier 1 and through channels 12 with the four progress or core boxes is connected. The carbon dioxide gas is only ever fed to the mold or core box located in position III, because of the Radial channel 10 is only coincident with the channel 12 leading to this box.

709 699/172

If necessary, the bottle 8 could also be arranged directly on the carrier 1.

After further rotation of the carrier 1, the shape under consideration arrives in position IV, in which it is by means of of the table 13 which can be raised and lowered, resting on the cover plate, can be lowered. Form or the core is then immediately ready for use.

Another exemplary embodiment of a mold and core manufacturing machine that is used to carry out of the method according to the invention can be used is shown in FIGS. 2 and 3 of the drawing.

This machine has a sand container 14, which is provided with a compressed air supply (not shown), which at the bottom is equipped with a valve 15 of, for. B. hemispherical shape closable nozzle 16 has. The feed line 8 a of the carbon dioxide gas coming from the bottle 8 opens below the valve 15 into the blow nozzle 16. As a result, when the valve 15 is closed, the penetration of carbon dioxide gas into the sand container 14 is prevented, so that the sand located in this cannot solidify. The valve 15 can be held in the closed position by means of a compressed air-loaded piston 17 under the action of a spring. The control of the valve 15, ie in the exemplary embodiment the control of the piston 17 with the supply of the carbon dioxide gas, is expediently coupled in such a way that this gas can only flow in when the valve 15 is closed.

On the other hand, in order to prevent the sand from penetrating the feed line Sa of the carbon dioxide gas, it is covered within the blow nozzle 16 with a sieve plate 18, as can be seen from the enlarged sectional view according to FIG.

Since the solidification time of the sand is longer than the working speed of the machine, it is advisable to to work with several core boxes when making cores.

Claims (6)

Patent claims: 40 1.Automatic molding or core blowing machine according to patent 860 241 with a prismatic model plate carrier that can be rotated and lifted about a horizontal axis, with a rectangular cross-section, the four sides of which serve as model tables and for fastening the molding or core boxes and which fastened everyone on it when it was rotated Brings molding or core box one after the other into four rotational positions offset by 90 °, characterized in that CO ₂ supply lines are arranged in the model plate carrier, which open out under the model plates (2) provided with slots (7) and are supported by a rotary valve (11) be controlled so that for CO ₂ hardening of the molds in the work cycle after the blow molding, CO _{2 is introduced} into the molds provided with suitable additives. 2. Automatic molding or core blowing machine for performing the method according to claim 1, characterized in that the carbon dioxide gas passes through the rotatable model plate carrier whose axis is fed and through a rotary valve only that mold or core box is supplied, which is in the rotary position following the blowing position. 3. Automatic molding or core blowing machine according to claim 2, characterized by a timer, which the supply of carbon dioxide gas to a fraction of the holding time of the Model plate carrier limited. 4. Molding and core manufacturing machine according to claim 1, consisting of a sand container, which is provided at the bottom with a blow nozzle that can be closed by a controlled valve, thereby characterized in that the supply of carbon dioxide gas below the valve in the Blowing nozzle opens. 5. molding and core manufacturing machine according to claim 4, characterized in that the supply line is covered with a sieve plate inside the air nozzle. 6. molding and core manufacturing machine according to claim 4, characterized in that the Control of the valve with the supply of carbon dioxide gas is coupled so that this gas only can flow in when the valve is closed. Considered publications:
German patent specification No. 860 241. 1 sheet of drawings © 709 699/172 9.