JPH01283112A - Manufacture of plate for slide valve and its molding device - Google Patents

Abstract

PURPOSE:To prevent the laminate-shaped constitution separation and generation of internal defects by filling kneaded soil in a lower frame and a side frame, providing a projected section on a section corresponding with an opening of a plate on an upper frame or the lower frame, forming a recessed section on a forming plate, and calcining and then boring a bore of desired diameter on a calcined plate. CONSTITUTION:A recessed section 8 smaller than an opening section 7 (a section for boring an opening by processing after calcination) for better air ventilation at the time of molding is provided. The size and shape of a projected section 5 provided on an upper frame 1 can be made in various ways to be determined in comparison with the size of the opening section 7. The larger the size is, the better the effect is, and the more effective it is, and its length and diameter (maximum sizes) of 0.2-0.95 times as much as the length and diameter of the opening 7 are effective, as the load applied to the projected section 5 gets larger. The surface of the projected section 5 with small unevenness and is more effective than a smooth surface, which receives, however, more load at the time of rising of the upper frame 1, and the shape of the surface should be selected according to the purposes of use.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a slide pulp used in ironworks to adjust the flow rate when taking out molten steel from a ladle or tundish. This invention relates to a manufacturing method and molding device for plates (fixed plates, sliding plates, etc.).

BACKGROUND OF THE INVENTION The conventional method of forming a sliding plate (hereinafter simply referred to as a plate) is to form a planar upper frame 1 of a molded den as shown in Figure FA5! It was moved up and down to apply pressure.

In this case, microcracks 11 in the form of a VC layer parallel to the plane are likely to occur inside the plate, which is a molded body (as shown in FIG. 6). Furthermore, when the internal gaseous substances are released during the drying and firing stages, a layered brittle structure or cavities are generated. If such a defect occurs near the hole 7 (as shown in FIG. 7), the plate cannot be used as a slide or a pulp plate, and its commercial value is lost. In addition, it is known that in the conventional method, there is a defect in which a difference in density occurs between the vicinity of the hole 7 and the flat area around the outer periphery due to the difference in thickness.

Problems to be Solved by the Invention As a means to solve the problems as described above, some methods have been used to use a core n in advance during molding to make a molded product having holes 7, but in reality, the size of the holes It is not widely practiced because the temperature varies in various ways.

The present invention aims to solve the above-mentioned problems such as (1) stratification during molding, (2) difficulty in removing gas during drying and firing, and (2) unevenness in molding density.

In addition, in the conventional method, the hole 7? After drilling, the cylindrical core becomes an unnecessary part and becomes a reused raw material (utility material), which often requires a large amount of drilled soil, but the method of the present invention reduces the amount of drilled soil used.

These problems are largely caused by the fact that it is difficult to remove air during molding, and that only a force perpendicular to the flat surface is applied. The cause of defects during drying and firing is the small surface area.

assignment? Means for Solving the Problems From the above-mentioned viewpoints, the inventors of the present invention have conducted various studies and experiments, and as a result have succeeded in developing the slide valve plate manufacturing method and molding device of the present invention. Although the configuration is specified in each claim, is this a specific example of the present invention? The details will be explained based on the accompanying drawings shown.

Figure m1 is a partial cross-sectional view of the mold showing the molding state of the molding apparatus of the present invention. A convex portion 5'If is removably fixed to a portion of the lower surface of the upper frame l corresponding to the hole of the finished plate. The height is smaller than the thickness dimension of the plate. Another 1 this convex part 5! It may also be set in the push up and down frame 3.

In addition, in the drawings, 2 indicates a lower frame, 3 indicates a push-up and upper frame, 4 indicates a side frame, and 6 indicates a mixed soil.

In the present invention, the hole portion 7 (the part where the hole is made by processing after firing)
The above-mentioned problem is solved by making the recess 8 smaller than that. The size and shape of the convex portion 5 to be attached to the upper frame 1 can be variously applied, but are determined by comparison with the size of the hole 7 made at the processing stage. The larger the size, the greater the effect, but since the load applied to the convex portion 5 increases, its length and diameter (maximum dimensions) should be 0.2 to 0.95 times the length and diameter of the hole 7. is effective.

If it is less than 0.2 times, the length and inner diameter of the recess 8 will be too small, making it difficult for air during molding and gaseous substances during firing to be released, and if it is more than 0.95 times, it will be difficult to remove the frame after molding. This is because the hole 7 may not be a perfect circle if the bottom of the recess 8 is damaged or if the diamond pit deviates even slightly from its normal position when drilling the plate.

Further, it is more effective if the surface of the convex portion 50 has small irregularities rather than a smooth surface, but conversely, the load increases when the upper frame 1 is raised, so it is better to select the surface according to the application. Specific examples thereof are illustrated in FIGS. 4(a) to 4(e). Density of molded body near hole 7? Various shapes can be selected to avoid the formation of layered, fragile tissue. That is, (a
) , (((b) shows that a weak layer parallel to the flat surface is not likely to occur as in the conventional case because a component of force that is not perpendicular to the flat surface acts near the hole 7. In addition, in (b) there are small protrusions 9 on the surface. It is particularly easy to release air and generated gas (internal gas) during molding, drying, and firing. (d
) indicates a convex portion 5 in the shape of a crest 5. In this case, there is an advantage that there is less resistance during molding, but the degassing effect is slightly inferior.

(e) shows a convex portion 5 in the shape of an idee. This type also (d
) has similar characteristics.

In addition, FIG. 8 is a sectional view showing an example of the muderate.

Example: A sliding plate was manufactured using clay having the Fe composition: A certain amount of clay having the above composition was put into the space formed by the lower frame 2, the upper and lower push frames 3, and the side frames 4, and then the upper frame 1' was formed. 9e800~15
The molded plate is pressed and molded under a pressure of QQ kg/m2, and a recess 8 is formed in the upper part of the so-called dowel portion 1O. After drying this molded body vlO (h'j- for about 10 hours, it is fired.The firing conditions are as follows: Firing temperature: 1350° to +450'c Firing time Near 0
~95hrs Firing furnace type: Reducing atmosphere tunnel ΦRun After the firing is completed, it is cooled and a hole 7 is drilled with a diamond pit to a desired hole diameter.

Effects of the Invention The method and apparatus for manufacturing a slide valve plate according to the present invention have the following effects.

(1) A component of force outside the blade can be applied to the area around the hole, which is in line with the flat surface, so layered tissue separation does not occur.

(In each step of 21 forming, drying, and firing, the air inside
Is it easy to release gas and is there an internal defect? Less likely to occur ◎ (Surface area increases) (3) Since the amount (weight, volume) to be drilled with a diamond bit and processed as a core is reduced, expensive plate raw materials can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the method of forming a slide plate according to the present invention, and Fig. 2 is a sectional view of the molded slide plate.
Figure 3 is a cross-sectional view of the finished product with holes, Figure 4 is a side view showing several examples of convex portions, and Figures 5 to 7 show the conventional forming means, molded product, and crack occurrence in the finished product. , Figure 8 is a cross-sectional view of the M tom plate, and in the figure, 1: upper frame, 2: lower frame, 3: push-down frame - 4: side frame, 5: convex part, 6: drilled soil, 7: Hole, 8: Recess, 9: Small protrusion, 10: Damage, 11: Layered crack. Figure 2 Figure 3

Claims (1)

[Claims] 1. In the method of manufacturing a plate for a slide valve, after filling the lower frame and side frames with clay, forming convex portions is provided on the upper frame or the lower frame at locations corresponding to the holes of the plate. A method for manufacturing a plate for a slide valve, which comprises forming concave portions in various molded plates and then firing the molded plates, and drilling holes of a desired hole diameter in the fired plates. 2. A slide valve plate forming device, characterized in that a convex portion having a height smaller than the thickness of the plate is protruded from the upper frame or the lower frame at a location corresponding to the hole of the finished plate. Valve plate forming equipment. 3. The slide valve plate forming apparatus according to claim 2, wherein the convex portion is made of metal, ceramics, or polymeric material. 4. The plate forming device for a slide valve according to claim 2, wherein the shape of the convex portion is approximately cylindrical, inverted truncated cone, inverted conical, crested, or pipe-shaped. 5. The slide valve plate forming device according to claim 2, wherein a hemispherical, triangular, or conical small protrusion is provided on the surface of the convex portion.