DE1061971B - Device for the production of molded masks and cores - Google Patents

Description

GERMAN

The invention relates to an apparatus for producing molded masks according to patent 832 936, at which models, model plates or core boxes are brought into line with a molding compound container, wherein the molding compound is applied to the models or model plates and hardened, whereupon the excess molding compound poured off and the mask detached from the model plate and lifted off will.

It has been found that there are some inconveniences when using it with simple means such devices, as they are contained in the main patent, can attach. It was z. B. found that when coupling the pattern plate and molding compound container with each other, the heat of the Pattern plate transfers to the upper part of the molding compound container. But this is in use thermoplastic molding compounds or thermoplastic binders are therefore undesirable and harmful, because this heat transfer leads to contamination of the sealing edge between the pattern plate and the molding compound container and thus leads to impairment of the working speed. According to the invention Now an intermediate frame is switched between the pattern plate and the molding compound container, on which the Heat of the model plate gradually transfers, but not in such a way that this heat is removed from the intermediate frame could be transferred to the molding compound container. Since the intermediate frame in the rest position neither with the The model plate is still in contact with the molding compound container, it cools down every now and then.

The intermediate frame is advantageously arranged so that it can be moved in such a way that it is connected to both the model plate as well as with the molding compound container and with both at the same time brought into congruence, coupled and can be pivoted. The handling of the individual parts is therefore very easy, see above that the working speed increases considerably as a result.

When using an intermediate frame, another very important advantage can be achieved will. To the organs present in the model plate for loosening and lifting the masks from the To bring the model plate back to its original position, springs have been built into the model plate so far, which push the lifting elements back into the starting position after the ram is withdrawn is. These springs are exposed to heavy wear and tear due to the heating of the model plates often have to be replaced, with the entire model equipment having to be dismantled. On the other hand, the lifting organs must not move when the molding compound falls, because it does so the still plastic molded mask is destroyed.

Device for manufacturing
of shaped masks and cores

Addendum to patent 832 936

Applicant:

ElIy Croning, née Börnsen,

Hamburg-Nienstedten,

Kurt-Küchler-Str. 35

Otto Hufeisen and Heinz Jäger, Braunschweig,
have been named as inventors

When the intermediate frame is used, it fixes the lifting members when it is locked to the model plate, so that the springs that were previously required can be dispensed with.
Another deficiency can be seen in the previous operation of the lifting devices. The finished preformed mask is lifted off the model plate either by means of lifting pins or, in the case of difficult models, by means of a lifting plate (scraper comb) in which the model is cut out.

Up to now it has been customary to mechanically remove these lifting devices by means of a stamp arranged under the model plate, to press upwards pneumatically or hydraulically. This withdrawal process is in the way is carried out so that the lift-off stroke is carried out uniformly at high speed. Through this hard lift-off, the molded masks are broken very often.

The present invention also relates to the lifting members in this lifting process to move so that the preformed mask is initially only slowly lifted, and then the actual lifting movement is measured, so that the machine former without difficulty on the lifting organs lying mask can be removed.

£ 09 578 / S6

Claims (3)

Furthermore, it has hitherto been customary to use the lifting members that detach the mask from the model to carry out the entire lift of the mask. A further object of the present invention is to lift the masks by a number of lifting pins which, as a result of a special lever transmission, multiply the lifting stroke of the stamp, in order to effect the removal of the masks in a convenient manner. The last-mentioned lift-off pins remain in the rest position when they are lifted due to a correspondingly designed lift-off transmission. In the drawings, exemplary embodiments of the improvements according to the invention of the device of the main patent are shown; Fig. 1 and 2 show the intermediate frame and its movable arrangement between the mold plate and the molding compound container in elevation, Fig. 3 the lifting device in elevation, Fig. 4 a second embodiment of the lifting device in elevation, Fig. 5 the same in plan. In the arrangement of the intermediate frame according to Fig. 1 and 2, the device consists in the usual way of the pattern plate 1 and the molding compound container 2. The pattern plate 1 runs on rails 3. while the molding compound container 2 is pivoted on an axis 4. An intermediate frame 5 is pivotably mounted on the same axis 4. The molding compound container 2 is balanced by a counterweight 6. Stop pins 7 are provided both on the pattern plate and on the molding compound container 2, which work together with stop blocks 8 of the intermediate frame 5. Furthermore, coupling means 9 are provided on the intermediate frame 5 and coupling means 10 are provided on the molding compound container 2, with the aid of which the intermediate frame 5 can be coupled to the molding compound container 2 or the pattern plate 1 or both. The mode of operation is as follows: The intermediate frame 5 is pivoted from the position in Fig. 1 to that in Fig. 2 on the model plate 1, whereby the lifting members not shown in the drawing are blocked against movement at the same time. The pattern plate 1 and the intermediate frame 5 are now pivoted together onto the molding compound container 2 and locked to it. Model plate 1, intermediate frame 5 and molding compound container 2 are then pivoted together into the position shown in FIG. 2, the thermoplastic material falling from container 2 onto the model located on model plate 1 and forming the mask. All three parts 1, 2 and 5 are then swiveled back into the starting position, with the excess mass falling back from the model into the container 2. Then the lock between the molding compound container 2 and the intermediate frame 5 is released and the parts 1 and 5, which are still coupled to one another, are pivoted so that the model plate 1 returns to the position shown in FIGS. The lock between the intermediate frame 5 and the model plate 1 is then released and the intermediate frame 5 is pivoted back into its rest position. The model plate with the mask generated on the model is then moved away and a new model plate is brought in, whereupon the above-described process can be repeated. In Fig. 3, an embodiment of the lifting device is shown. In the base frame 11 carrying the lifting device there is provided a link 12 which can be moved back and forth in the direction of the arrow and contains cam tracks 13 and 14, of which the cam tracks 13 are used to guide control members 15 for moving the lifting die 16, while the cam tracks 14 are used for guidance are used by control members 17, which bring about the bracketing of the lifting device with the model plate during lifting, which is not of interest here. The cam tracks are guided in such a way that the bolts 18, which operate the lifting ram 16, first execute a small and later a more powerful stroke. The gate 12 is pneumatically, hydraulically or mechanically moved from the initial position shown in the direction of the arrow. As a result, the control members 15 are inevitably guided through the course of the curves 13, lifted and with them the bolts 18, which transmit this stroke to the punch 16. In Figs. 4 and 5, a special embodiment of the part of the lifting device arranged in the model plate is shown, the arrangement of Fig. 4 sitting on top of that of Fig. 3. The lifting plate 19 shown as the lowest part in Fig. 4 forms the uppermost part in Fig. 3 and is operated by the punch 16. The model plate 20 is covered with two rib cylinder models 21. The preformed mask is lifted by a stripping comb 22, which is lifted by the lifting plate 19, to which it is connected by some bolts, not shown, as soon as the lifting plate 19 is lifted by the lifting ram 16 (Fig. 3). Four lift-off pins 23 are also provided, which are operated by levers 24 and 25. When the lifting plate 19 moves towards the model plate 20, the stripping comb 22 and the lifting pins 23 initially rise evenly; in doing so, the levers 24 execute a rotary movement against the shaft 26 which is fixedly mounted in the model plate. If the movement of the lifting plate 19 is continued, the lifting pins 23 will run ahead of the scraper comb 22 in accordance with the transmission ratio of the levers, namely about 5 mm with a lift of 25 mm. At the maximum lifting height, the lifting bolts have rushed ahead of the lifting comb by about 15 mm. Patent claims: 1. Device for molding masks or hollow core production by pouring the molding compound on preheated models according to patent 832 936, whereby the molding compound container with the models, Model plates or core boxes is brought into cover by a swivel device, thereby characterized in that, in addition, between the molding compound container (2) and model plate (1) or model or core box a swing-out intermediate frame (5) is arranged so that it is in Cools down at rest. 2. Apparatus according to claim 1, characterized in that the molding compound container (2) has a Locking device (10) for coupling the molding compound container, the intermediate frame (5) and the pattern plate (1) is arranged. 3. Device according to claim 1, characterized in that that under the model plate a link-controlled lifting device for the molded masks is arranged so that first the loosening at low speed and then with The form masks are lifted off at a higher speed.