JP3044282B2 - Rail welding mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail welding mold used for thermite welding of rails arranged with a gap.

[0002]

2. Description of the Related Art With regard to thermite welding of rails, for example, Japanese Patent Publication No. 59-8777 proposes a method of rail thermite welding and a mold thereof, but they are arranged to face each other with a predetermined gap. The ends of the rails were surrounded by left and right divided molds, and molten steel produced by a thermit method was injected into the mold cavities from above to join the rails.

[0003]

However, if one of the rails is a used rail and the other is a new rail, the train passes over the rail head.
It was necessary to join the tops of both rails together. For this reason, if the head of the rail being used is worn, the legs of both rails will not be aligned, and in some cases a maximum of 7
Since a step of about mm is generated, if welding is performed using a mold integrated on one side as shown in the above-mentioned publication, the rail to be joined does not match with the mold, and cast metal or the like in which weld metal leaks from a gap occurs. Further, since the joint surface of the rail undergoes a sudden change in cross section, there is a problem that the strength of the joint surface is reduced. In addition, since the mold has a complicated shape, it is necessary to use a mold having a core, and it is difficult to manufacture the mold. Further, there are problems such as insufficient filling of the mold sand and generation of cracks. The present invention has been made in view of such circumstances, and makes it easy to manufacture a mold, has high manufacturing accuracy, and can avoid abrupt cross-sectional change of a joint portion of a rail, prevent casting, and maintain joint strength. An object of the present invention is to provide a rail welding mold.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The described rail welding mold is a mold that surrounds the joint of the rail, has a cavity inside in an assembled state, and is used for thermite welding the rail,
A state in which the mold covering the welded portion from the periphery is divided facing each other around the rail, and further divided into two around the joint in the rail length direction, so that a total of four divided upper mold groups are assembled; And a lower mold disposed on the bottom of the upper mold group to cover the bottom surface of the rail. According to a second aspect of the present invention, there is provided a rail welding mold according to the first aspect, wherein a linear projection is provided on a mold surrounding a lower joint of the rail, and a groove is formed outside the mold. The mold and the rail are brought into contact with the linear projection. In the above description, the term "linear projection" includes one having a rounded tip cross section and more linearly contacting the contact object.

[0005]

In the rail welding mold according to the present invention, the mold divided oppositely with respect to the rail is further divided into two around the joint in the rail length direction. Even when rails with worn parts are joined, the upper mold group can be divided and attached to each rail, and even if there is a slight step on the bottom surface of the rail to be joined, the lower mold can be separated. Since it has a structure, it can be easily brought into contact with the rails at both ends, can be sealed with a small amount of plastic material together with the assembled divided upper mold group, and a mold with less occurrence of casting can be constructed. In addition, by dividing the mold, it is possible to improve the poor filling or the difficulty of the filling operation when the mold for the mold is filled with sand, and to prevent the crack at the time of removing the core. The quality can be improved. Then, since linear projections are provided on at least the lower part and the lower mold of the divided upper mold group further divided into two in the rail length direction, when the divided upper mold group is incorporated and the rail joint is surrounded and opposed. In addition, the divided upper mold group easily comes into line contact with the rail, and even in the lower mold, even if there is a large step on the bottom surface of the rails at both ends, the line comes into easy line contact, and furthermore, the linear projection A groove is provided on the outside of the part, so by filling plastic material in this part, the sealing between the rail and the mold and the mold can be improved, casting can be prevented, and the joining strength can be improved .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
Here, FIG. 1 is an exploded perspective view of a rail welding mold according to one embodiment of the present invention, FIG. 2 is a side view showing a use state of the same mold, and FIG. 3 is a cross-sectional view showing a use state of the same mold. .

As shown in FIGS. 1 to 3, a rail welding mold 10 according to one embodiment of the present invention
The upper mold group 13 surrounding the joints of the upper and lower molds 13, the lower mold 14 disposed at the bottom of the upper mold group 13, and the cap 16 attached to the upper pouring port 15. You. Then, the divided upper mold group 13 includes the rails 11, 1
The upper molds 17 to 20 are opposed to each other around the center 2 and are divided into four around the joints in the length direction of the rails 11 and 12. Hereinafter, these will be described in detail.

In the mold 10, a predetermined amount of water glass and, if necessary, a pigment are added to silica sand, mixed sufficiently, put into a mold in which a predetermined core is arranged, and penetrated therein. An air inlet is provided, carbon dioxide gas is injected from the air inlet to solidify, the core is removed, the frame is removed, and each of the upper molds 17 to 2 is removed.
0, the lower mold 14 and the cap 16 are manufactured. The mold may be made of a material made of a refractory other than the above.

Inside the upper molds 17 to 20 and the lower mold 14, there is provided a cavity 21 into which molten metal is injected into a joint between the rails 11 and 12 to be mounted. An extra protruding portion is provided so as to protrude by 2 to 3 mm so that the joint portion between the rails 11 and 12 can be reinforced. A linear projection 21a is provided on the outside of the extra bank at the lower portion of the upper molds 17 to 20, and a groove 21b is provided on the outside thereof. In use, the linear projection 21a is a rail. 11 and 12 so that the groove 21b can be filled with a plastic material. When the upper molds 17 to 20 are combined, air holes 22 and 23 are formed in the center of both sides, and the air holes 22 and 23 are formed.
23 has an inner cavity 21 and a thin communication hole 2
4 and 25 are connected to each other, so that the air collected inside at the time of pouring can smoothly escape. The cavity 2
1 is provided with a mounting portion for the rails 11 and 12, and the rail mounting portion has a size such that the height and width of the new rail among the rails 11 and 12 match. Has been determined.

The lower mold 14 is also made of a refractory material, has a surplus portion 26 in the center of the surface corresponding to the joining portion, a linear protruding portion 26a around the portion, and a groove on the outside. 26b, and when assembled, the linear projections 26a are connected to the bottoms of the rails 11 and 12 and the upper molds 17 to 20.
The groove 26b is filled with a plastic material so that the seal can be completely completed. The cap 16 is a tapered pouring port 1 formed by the combined divided upper mold group 13.
The shape is determined so as to be mounted on the handle 5, and a handle 27 made of a metal member or the like is provided at the upper part.

Therefore, when the rail welding mold 10 is used, the top ends of the rails 11 and 12 are aligned, and the ends thereof are provided with a gap of about 10 to 30 mm.
1 and 12 are fixed, and the divided part of the upper mold group 13 faces the rails 11 and 12 and the rail 1
1 and 12 are made to coincide with the portion centered on the joint in the length direction, and further, the upper molds 17 to
The lower mold 20 is held so that the bottoms of the upper molds 20 are aligned with each other, and as shown in FIG. Thereby, the rail 1
After checking the gap between the molds 1 and 12 and the mold 10, once disassembling the mold 10, the gap is filled with a sufficiently soft refractory material such as mortar or clay to seal the gap. In the final assembly, the linear projections 21a of the upper molds 17 to 20 abut against the side surfaces of the rails 11 and 12,
The linear projections 26a of the lower mold 14 are brought into contact with the bottom surfaces of the rails 11 and 12 and the bottom surfaces of the upper molds 17 to 20, and furthermore, a refractory plastic material is filled between the respective grooves 21b and 26b. And seal.

As a result, the gaps between the rails 11 and 12 and the divided upper mold group 13 and lower mold 14 are filled with the refractory material, and casting when molten metal is filled is reduced.
After the above steps, the whole is fixed with a mold, the whole is appropriately preheated, and hot water (molten steel) manufactured by the thermit method is poured into the cavity 21 from the pouring port 15.
As a result, the hot water is filled into the cavity portion 21 and the air that is going to collect inside passes through the communication holes 24 and 25,
Since it moves in the direction of the air holes 22, 23, the air inside is completely removed, and the welding of the rails 11, 12 is completed. Therefore, after cooling, the outer frame and the rail welding mold 10 are removed, and unnecessary portions are cut, thereby completing the operation.

[0013]

According to the first and second embodiments of the present invention, the mold for covering the welded portion from the periphery is divided so as to face each other with the rail as the center and further divided into two with the joint as the center in the rail length direction. And the lower mold that is arranged at the bottom of the divided upper mold group and covers the bottom surface of the rail in an assembled state, so that there is a difference in the height of the connecting rails. In addition, the height direction can be adjusted so that the upper mold group can be aligned with the rail, thereby reducing casting and facilitating the manufacture of the mold. In particular,
Since the mold according to claim 2 is joined to the rail or an adjacent mold via a linear projection, and further provided with a groove outside thereof so that a refractory plastic material can be filled after assembly, Casting can be reduced, thereby enabling welding of rails with less occurrence of stress concentration and the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rail welding mold according to one embodiment of the present invention.

FIG. 2 is a side view of a state where the rail welding mold is assembled.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 rail welding mold 11 rail 12 rail 13 divided upper mold group 14 lower mold 15 pouring port 16 cap 17 upper mold 18 upper mold 19 upper mold 20 upper mold 21 cavity 21a linear protrusion 21b groove 22 air hole 23 air Hole 24 Communication hole 25 Communication hole 26 Excess portion 26a Linear projection 26b Groove 27 Handle

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Uchino 1-1-1, Hibata-cho, Tobata-ku, Kitakyushu-city, Fukuoka Prefecture Inside Nippon Steel Corporation Yawata Works (72) Inventor Kazuo Sugino Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture No. 1-1, Nippon Steel Corporation Yawata Works (72) Inventor Kenichi Karamine 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (56) References JP Akira 54-18448 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 23/00

Claims (2)

(57) [Claims] 1. A mold that surrounds a joint portion of a rail, has a cavity inside in an assembled state, and is used for thermit welding of the rail, wherein the mold covering a weld portion from the periphery is provided. A total of four divided upper mold groups which are divided facing each other with the rail as the center and further divided into two around the joint in the rail length direction, and arranged on the bottom of the divided upper mold group in an assembled state And a lower mold for covering a bottom surface of the rail. 2. A mold that surrounds a lower joint of the rail is provided with a linear protrusion, and a groove is formed outside the mold, and the mold and the rail are brought into contact with the linear protrusion. The rail welding mold according to claim 1, wherein