JPH0246975Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial field of application> This invention is based on the idea that a cylindrical body is divided into multiple parts along the axis, and a refractory part corresponding to one piece is divided along the inner surface of the cylindrical body. This invention relates to a lower die for press-molding a block provided with a metal strip.

<Prior Art> Conventionally, a refractory block 1 as shown in FIGS. 6a and 6b is known. This block 1 has a substantially semi-cylindrical shape and is integrally formed with a metal band 2 on the inner peripheral surface. The metal strip 2 has protrusions 5 at both ends thereof that protrude from a dividing surface 4 which is formed by dividing the cylindrical body of the refractory part 3 into two, and a joining protrusion 6 is welded to the surface joined to the refractory part 3. Or it is formed by cutting and raising it. Such a block 1 is described in Japanese Utility Model Publication No. 55-33104, and is used for insulating the surface of a water-cooled pipe, such as a water-cooled skid of a heating furnace, and is attached to the pipe surface using a protrusion 5. Ru. The protruding portion 5 may be used in a straight state, or may be used with its tip bent. It should be noted that the shape of the block 1 may be such that the cross section is semi-circular, half-width, etc., and the block 1 may be divided into three or four parts instead of two.

To manufacture such a cylindrical split type block 1, a lower mold 7 as shown in FIG. 7 is used. The lower mold 7 has an upper surface that roughly corresponds to the shape of the divided surface side of the block 1, and has a semicylindrical convex surface 8, a flat surface 9 extending outward from both sides of the convex surface 8, and protrusions 5 at both ends of the metal strip. and a hole 10 provided in the plane 9 into which the holder can be inserted. The protrusions 5 at both ends of the metal band 2 are inserted into the holes 10 of the lower mold 7, the frame mold 11 is installed, and the potted clay 12 is put inside and compressed by pressing from above with the upper mold 13. , block 1 is obtained.

<Problems to be solved by the invention> The conventional block molding lower mold 7 has the following problems. (1) Fine powder of cup soil enters the hole 10, making it difficult to insert and remove the metal band 2. (2) Hole 1
Cleaning 0 is a hassle. (3) A method that can be considered is to provide a large groove or through hole at the bottom of the hole to allow the fine powder to fall and be discharged to the outside, but this increases the mold manufacturing cost. (4) If the protruding portion 5 requires bending, that processing can only be done after block forming. Therefore, it is very time consuming and the machining accuracy is poor.

<Means for Solving the Problems> The means of this invention has a convex surface projecting upward in a shape corresponding to the inner circumferential surface of the refractory block as described above, and a refractory block having a convex surface projecting upwardly from the lower edge of both sides of the convex surface. and a side upper surface corresponding to the dividing surface extending to the convex surface, and a cut surface extending downward in a dimension corresponding to the protruding dimension of the metal band and then outward along both edges of the convex surface. A presser foot is formed separately from the lower die main body with a length corresponding to the width dimension of the metal band so as to include the entire length of the upper surface of the side part or at least the protruding position of the metal band, and to make it removable and to prevent the protrusion of the metal band. It is characterized by having a notch corresponding to the part.

<Function> According to the above means, the notch corresponds to the hole in the conventional lower mold, and can be used together with the conventional frame mold and upper mold to produce a cylindrical split mold with a metal band in substantially the same manner as the conventional method. It is possible to form refractory blocks. Since the presser foot is removable, it is easy to remove the end of the metal band even if fine powder from the cup soil gets into the notch, and it is also easy to clean. If required, a pre-bent metal strip can be used.

<Example> A first example of this invention is shown in FIGS. 1 and 2. This embodiment is for the block 1 shown in FIG. 6, in which the protrusions 5 at both ends of the metal strip 2 are straight. In the figure, 20 is the lower mold body, 2
1 is a presser foot, and 22 is a notch.

The lower die main body 20 has a semicylindrical convex surface 25 corresponding to the inner peripheral surface of the block 1, side surfaces 26 extending downward following both sides of the convex surface 25, and lower ends of the side surfaces 26 extending outward. As shown in the figure, it is formed to have a constant cross section and a length corresponding to the length of the block 1.

The presser foot 21 is a rectangular parallelepiped having a size that fills the corner of the lower mold body 20 formed by a side surface 26 and a flat surface 27, and has an inner surface 28 that abuts the side surface 26,
It has a lower surface 29 that abuts the plane 27 and an upper surface 30 that corresponds to the cylindrical dividing surface of the block 1. In the illustrated assembled state, the outer surface and both end surfaces of the presser foot 21 match the outer surface and both end surfaces of the main body 20.

The notches 22 have a size corresponding to the protrusion 5 of the metal band 2, and two cutouts 22 are provided on the inner surface 28 of each presser foot 21.

FIG. 3 shows a second embodiment, which is for a block 1a in which a protrusion 5a of a metal band 2a is bent. The difference from the first embodiment is that the presser foot 2
The notch 22a of 1a is enlarged downward corresponding to the protrusion 5a, and the abutting surfaces 27a and 29
A is provided with a concave portion 32 and a convex portion 31 that engage with each other. The concave portion 32 and the convex portion 31 are designed to prevent the presser foot 21a from moving outward.

FIG. 4 shows a third embodiment, which differs from the one in FIG.
9b has not been reached, and the rest are the same.

FIG. 5 shows a fourth embodiment, which differs from the first embodiment in that the presser foot 21c is not the same length as the entire length of the main body 20c, but the width of the metal strip is adjusted according to the position of the end of the metal strip. As a length corresponding to the dimensions,
The corner portion corresponding to this presser foot 21c is attached to the main body 20.
This is the point formed at c. Although the cross-sectional shape of the notch position in this embodiment is not shown, it is approximately the same as that in FIG. 2.

Further, as a modification of the fourth embodiment, the shape of the cutout may be as shown in FIGS. 3 and 4.

Furthermore, in addition to the above-mentioned embodiment, the length of the presser foot in the block axis direction may be made slightly longer than that of the fourth embodiment, and may be formed at each end of each metal band.

In the above embodiments, parts equivalent to those in the first embodiment shown in Figs. 1 and 2 are indicated by the same drawing reference numerals with suffixes a, b, and c to distinguish them in each embodiment, and their explanations are omitted. .

In each of the lower molds of the above-mentioned embodiments, a metal strip can be installed as shown in FIGS. 2 to 4, respectively, and then a block can be manufactured in the same manner as in the conventional method. When the block is removed from the mold, the presser foot is also removed and cleaned if necessary. Note that the metal strip bonded to the block usually has a width of about 25 mm and a thickness of about 3 mm, and the length of the protrusion is 30 to 50 mm.

<Effects of the invention> According to this invention, since the presser foot is removable, it is easy to clean the insertion part at the end of the metal band, and when a bent part is required at the part of the metal band that protrudes from the block, it is easy to clean the insertion part at the end of the metal band. Since it is possible to use a metal strip that has been bent from scratch, the processing accuracy is good and the block can be precisely attached to the metal pipe. In this respect, compared to the conventional case of bending the ends of the metal strip after block forming, the quality is improved and the processing time is significantly shortened, resulting in a cost reduction effect.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the first embodiment of this invention;
The figure is a sectional view taken at the notch position of the first embodiment, FIG. 3 is a sectional view similar to FIG. 2 of the second embodiment, and the fourth
The figure is a sectional view similar to FIG. 2 of the third embodiment, FIG. 5 is a perspective view similar to FIG. 1 of the fourth embodiment, and FIG. An example is shown in which a is a sectional view taken along the line A-A in b, b is a bottom view, and FIG. 7 is a longitudinal sectional front view for explaining a conventional block manufacturing method and its press mold. 1...Block, 2...Metal band, 3...Refractory part, 4...Divided surface, 5...Protrusion, 20, 20
a, 20b, 20c...lower mold body, 21, 21
a, 21b, 21c...presser foot, 22, 22
a, 22b, 22c...notch, 25, 25a, 2
5b, 25c... convex surface, 30, 30a, 30b,
30c...Top surface.

Claims (1)

[Scope of utility model registration request] A cylindrical split-type refractory part corresponding to one piece obtained by dividing a cylindrical body into a plurality of parts along the axis, and a refractory part installed along the inner circumferential surface of the refractory part at a predetermined position in the axial direction, with both ends A lower mold for forming a refractory block consisting of a metal strip projecting a predetermined dimension from the dividing surface of the division, which has a convex surface projecting upward and having a shape corresponding to the shape of the inner peripheral surface of the block. It has side upper surfaces corresponding to the dividing surfaces extending outward from both lower edges, respectively, and extending downward along both lower edges of the convex surface by a dimension corresponding to the protruding dimension of the metal band. Separate a presser foot from the lower die main body with a length corresponding to the width of the metal band so that the outward cut surface includes the entire length of the upper surface of the side part or at least the protruding position of the metal band, and detach it. A lower mold for forming a refractory block, which is capable of forming a refractory block and is provided with a notch corresponding to a protrusion of a metal strip.