DE2455703B2 - PRESSED GAIN CONTROL CIRCUIT FOR TELEVISION RECEIVER - Google Patents

Description

The invention relates to a method of manufacture a slide plate for the slide gate containing liquid melt at the pouring opening metallurgical container, in particular pouring ladle with a sliding surface, flow opening, storage surface and on the bearing surface with a spring surrounding the flow opening by pressing and burning a mixture with a high proportion of sintered granular refractory material.

From DT-OS 2107127 is a slide plate of the aforementioned type known, which consists of a mixture of refractory fused or sintered magnesia in the grain size 0.5-1 mm to 55% by weight, in the grain size 0.2-0.5 mm to 32% by weight and in the grain size below 0.2 mm to 13% by weight with additive a common binder in small quantities by mixing, pressing, ceramic firing, drilling Flow opening and grinding of the sliding surface is made.

In the formats required for specific purposes of valve plates made from mixtures with a high proportion of sintered, granular, refractory Material with no or only a very small proportion of plasticizing material and a binding agent However, there was a breakage rate of around 90% of the panels during production, as these on The transition from the bearing surface to the spring part showed cracks.

The object of the invention is therefore to create a method for producing such slide plates from mixtures with a high proportion of sintered, granular, refractory material, in which the unwanted cracking is largely excluded.

According to the invention, this object is achieved in that at least at the points at risk of cracking dei Plate in the area of the spring and on the bearing surface a coarser grain mixture and in the rest of the area a finer grain mixture of the refractory material are placed in the die, wherein

a) the coarser grain mixture of sintered materia! the grain

1-2 mm 21-29% by weight

0.5-1 mm 18-24% by weight

0.09-1 mm 18-24% by weight

below 0.09 mm 30-36% by weight

b) the finer grain mixture sintered material of the grain

1-2 mm 16-22% by weight

0.5-1 mm 16-22% by weight

0.09-0.5 mm 20-27% by weight

below 0.09 mm 35-39% by weight

and an at least 5 wt.% higher Kornan part below 0.5 mm compared to the coarser Kornmi has schung, and that in the mold on the de end face of the spring associated surface a « Layer or plate made of resilient material such as rubber or soft plastic is inserted.

It has surprisingly been found that with this method no cracks at the transition from the ebe nen part of the slide plate (bearing surface) to the spring

3 Γ ⁴

occur more. Nonetheless, a material with a finer grain mixture that is solid to the valve is created,

Plate with a smooth, easy-to-grind surface. According to Fig. 1 is first in a mold 3 ent-

Optimal properties are obtained when a speaking figure (consisting of a matrix,

a) the coarser grain mixture of sintered material and upper punch) a resilient layer or the grit 5 plate 4 from z. B. rubber or plastic inserted.

1-2 mm 23-27 wt.% To create a smooth lower end surface 1 of the

0.5-1 mm 19-22% by weight of the spring 6 of the slide plate 7, a sheet steel 5 is placed

0.09-0.5 mm 20-23% by weight on the layer or plate 4 of preferably 2 to

below 0.09 mm 30-36% by weight K) mm thickness. Then a layer 2 becomes coarser

b) the finer grain mixture sintered material io grain mixture is filled into the mold 3 until the grain size at least that for cracking at the foot of the spring 6

1-2; mm 17-20% by weight lying areas Λ are covered. In this way

0.5-1 mm 18-21 wt.% The layer 2 of coarser grain mixture also fills the

0.09-0.5 mm 22-27% by weight area of the compression mold 3, which the bearing surface 12

under 0.09 mm 35-39% by weight 15 of the slide plate 7 around the spring 6.

having. A layer of 1 finer grain mixture is then applied

In a further embodiment of the method, the layer 2 of the coarser grain mixture is to be applied in such a way that

finer grain mixture of sintered material with an essentially flat, but preferably

by 8-13 wt.%, preferably 10 wt.%, higher wise somewhat rough boundary surface 8 between two

Grain fraction below 0.5 mm compared to the coarser ^ao den, but no significant mixing of the

Possess grain mix. both grain mixes takes place. Layer 2 forms

The mixtures contain a binding agent as an additive, thus the sliding surface 13 of the slide plate 7.

set in small amounts, such as aqueous suI

Fitablauge, Epsom salt dissolved in water, sodium pounding the pressed slide plate 7 out of the press

lyphosphate or monoaluminum phosphate. »5 form 3 are created due to the resilient layer or

The mixtures can e.g. B. from granular Ma plate 4 in the crack-prone cross-section at the foot of the

Gnesiasinter and a binding agent consist or of spring part 6 no harmful tensions and a

granular high-tone sintered material such as "sticking" of the spring 6 in the mold 3

Mullite and / or corundum, possibly up to 2% by weight fire-avoided. Due to the inserted sheet steel 5 is obtained

solid fine-grain clay or caustic fired 3 °, the spring 6 has a flat lower end surface 9.

Clay and a binder. According to Fig. 2, the layer 1 is finer grain size

The grain mixtures are preferably brought into contact not only in the area of the sliding surface 13, but two Layers in the mold in such a way that the without spatial interruption is also roughly zygärbere Grain mixture at least in the outer Linder-shaped or slightly frustoconical Mitreich the spring and in the adjoining bag part 10 of the spring 6, in which later the is introduced rich on the bearing surface and above with an approximately flat flow opening 11 is provided. Boundary surface minimizes the finer grain mix- This can be achieved in a known manner by be arranged at least in the area on the sliding surface that one is in the middle part of the spring forming the. Area of the mold 3 is a tubular template

In order to ensure that the 40 to be provided later begins, the coarser grain mixture around the template

Pass is smooth and wear-resistant, is further around in one layer and then the finer grain size

Embodiment of the method according to the invention the schung in the template and in a layer over the

finer grain mix also in the middle part of the nib coarser grain mix without significant loss of

arranged, which fills the two grain mixtures for receiving the flow opening and before

is provided. 45 press the template out of the mold

Around a flat lower surface of the spring and a pulls.

easy detachment of the molded body from the mold. The boundary surface 8 between layer 2 is larger obtained, is preferably in the mold over the grain mixture and layer 1 of finer grain medium Layer of the plate made of resilient material schung is also for a perfect connection a sheet of steel inserted. 5 ° somewhat rough and runs in the middle area of the feet

The drawing shows two executions 6 roughly parallel or somewhat conical to the late

Approximation examples of the method according to the invention ren flow opening 11. The layer 2 coarser

for manufacturing a slide plate. Grain mixture thus forms, with the exception of the

Fig. 1 illustrates the embodiment, in the middle area of the end surface 9 of the spring 6, the bearing softer, the lower layer of coarser grain mixture 55 surface 12, the spring wall surface 12 'and the outer with the upper layer of finer grain mixture part of the spring wall surface 9. In this way it becomes about have a flat boundary surface. is sufficient that the flow opening 11 is smooth and

Fig. 2 illustrates the embodiment when is resistant to shooting. Nevertheless, at the crack-endangered

which the upper layer of finer grain mixture in th places Λ, in which the layer 2 coarser

the spring part of the slide plate protrudes, so that 60 grain mixture is provided, supported by the

which later through the slide plate in the area of the Fe effect of the resilient layer or plate 4 no

the throughflow opening to be provided is entirely in the fire cracks.

For this purpose 4 sheets of drawings

Claims (7)

Patent claims: 1. A process for the production of a slide plate for the slide gate at the pouring opening, metallurgical containers containing liquid melt, in particular casting ladles, with a sliding surface, flow opening, bearing surface and on the bearing surface with a spring surrounding the flow opening, by pressing and burning a mixture with high Proportion of sintered, granular, refractory material, characterized in that a coarser grain mixture and in the remaining area a finer grain mixture of the refractory material is arranged in the mold at least at the crack-endangered points in the area of the spring and on the bearing surface, whereby
a) the coarser grain mixture of sintered material of grain size ^ao 1-2 mm 21-29% by weight 0.5-1 mm 18-24% by weight 0.09-0.5 mm 18-24% by weight below 0.09 mm 30-36% by weight Ib) the finer grain mixture sintered Mate ^a 5 rial grit 1-2 mm 16-22% by weight 0.5-1 mm 16-22% by weight 0.09-0.5 mm 20-27% by weight below 0.09 mm 35-39% by weight and an at least 5 wt.% higher grain fraction below 0.5 mm compared to the coarser one Has grain mixture, and that in the mold on the surface associated with the end face of the spring a layer or plate made of resilient material is inserted. 2. The method according to claim 1, characterized in that a finer grain mixture that Sintered material with an 8-13% by weight, preferably 10% by weight, higher grain fraction below 0.5 mm compared to the coarser grain mixture is used. 3. The method according to claim 1 or 2, characterized in that made of granular magnesia sinter Mixtures consisting of a binder can be used. 4. The method according to claim 1 or 2, characterized in that a mixture consisting of granular high alumina sintered material, possibly up to 2% by weight of refractory fine-grained 5 » Clay or caustic clay and a binder is used. 5. The method according to claim 1, characterized in that the coarser in the mold Grain mixing at least in the outer area of the spring and in the area adjoining it on the bearing surface and above it with an approximately flat boundary surface the finer grain distribution be arranged at least in the area on the sliding surface. 6. The method according to claim 1, characterized in that the finer in the mold Grain mixture in the area of the sliding surface and without spatial interruption in the central part of the Spring is arranged, which is provided for receiving the flow opening. 7. The method according to the preceding claims, characterized in that in the A steel sheet is inserted into the compression mold over the layer or plate made of resilient material,