JPS6330152A - Continuous casting method for pipe - Google Patents

Abstract

PURPOSE:To easily and continuously cast a pipe having socket part at the one end by dipping a mold into molten metal to the socket casting part, which is formed as inserting a core at the upper part of mold, coming out the socket casting part of mold from the molten surface after the outside face of socket part is solidified by cooling of the mold and drawing up the pipe together with the core. CONSTITUTION:The core 18 is fitted to a lifting table 14, and inserted from the upper side of hollow part 6 for casting. Next, the lifter 12 is risen and a ladle 11 is lifted up, so as to dip the mold 3 into the molten metal 10, and the molten metal 10 is reached to the socket casting part 7 of hollow part 6 for casting. The molten metal 10 between a water cooling jacket 4 and the core 18 is cooled and solidified, to form the socket part 20 of pipe 19. The lifter 12 is descended and the molten metal 10 level is descended to the pipe barrel casting part 8, so as to come out the socket casting part 7 above the molten surface. Next, the inner face of socket part 20 is suitably held, and by rising up the lifting table 14, the hollow pipe barrel part 22 as connecting with the socket part 20 is continuously cast by the pipe barrel casting part 8.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for continuous casting of tubes.

2. Description of the Related Art As a method for casting hollow metal tubes, a pull-type continuous casting method is conventionally known. This involves immersing a mold in which the pipe casting hole is vertically extended into the molten metal, and pulling the solidification cracks formed on the inner periphery of the pipe casting hole upward as the mold cools. This allows metal tubes to be continuously cast.

Problems to be Solved by the Invention In the conventional casting method as described above, for example, by controlling the pulling speed, it is possible to obtain a stepped tube on the inner surface. It is possible to change it. However, since the outer surface of the tube is subject to restrictions on the tube casting hole, there is a problem in that only a fixed outer diameter can be obtained. In particular, cast iron pipes generally have a socket at one end, but there is a problem in that it is impossible to form this socket using the conventional casting method as described above.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to make it possible to easily continuously cast a pipe having a socket at the negative end.

Problems! ! Means for Solving In order to solve the above-mentioned problems, the present invention forms a socket casting part on the upper inner surface of a tube casting hole formed vertically through the center of the mold, and A pipe body casting part is formed on the inner surface of the pipe casting hole on the lower side of the mouth casting part, a core for forming the socket inner surface is inserted into the upper part of the mold, and this mold is passed to the socket casting part. After the socket of the pipe is immersed in the molten metal and the mold is cooled to solidify, the cast part of the socket is removed from the surface of the molten metal, the casting part of the pipe adjustment part is left in the molten metal, and then the pipe is moved upward together with the core. The pipe is pulled up and a pipe body continuing to the socket is cast.

By doing this, by inserting the core into the upper part of the mold and immersing this mold in the molten metal up to the socket casting part, the outer surface of the pipe socket is formed by the socket casting part as the mold cools. At the same time, the inner surface of the core is solidified and formed. After the socket has solidified, when the socket casting part of the mold is removed from the hot water surface and the tube is pulled up together with the core, the pipe body casting part of the mold remaining in the molten metal will cause the pipe body following the socket to parts are continuously cast.

Embodiment In FIGS. 1 to 3, (1) is a frame for continuous fishing, which is raised upward from the floor surface (2).

A mold (3) is attached to the frame (υ) at a distance from the floor (2).
Copper water cooling jacket (4) and this water cooling jacket (
4) and a refractory heat insulating material (5) covering the outer periphery and bottom of the container. A vertical tube casting hole (6) is formed through the center of the water cooling jacket (4).

A socket casting part <7> capable of molding the outer peripheral surface of a socket of a pipe to be cast is formed on the upper inner surface of the hole (6). In addition, the hole (6) on the lower side of this socket casting part (7)
) is formed with a tube body casting part (8) capable of molding the outer peripheral surface of the body of the tube to be cast.

Thermocouples (9) as temperature sensors are embedded in the inner wall of the water cooling jacket forming the hole (6) at a plurality of positions in the length direction of the hole (6).

Below the mold (3) is a ladle 0 filled with molten metal 01.
11 is arranged, and this ladle α° C. is installed on the floor (21) or raised and lowered using a lid 4.

A drawing device a3 is provided inside the frame (1) above the mold (3). Here, 04) is a lifting platform that can be moved up and down guided by a guide bar. A vertical feed screw 06 is screwed onto the elevating table α4, and by rotating this feed screw af3 with a motor a7), the elevating table a4 can be driven up and down. A core for forming the inner surface of the tube socket is attached to the lower surface of the lifting platform Q4) concentrically with the hole (6).

The casting operation will be explained in detail below. First, as shown in FIG. 1, a ladle oB filled with molten metal 00 is carried onto a lifter @. Attach the lifting platform 0 → to the core), lower the lifting platform (4) to the lifting platform, and insert the core a8 into the casting hole (
6) into the predetermined position in this hole (6) from above.

Next, as shown in Fig. 2, lift the lifter @ and mold (
3] Lift the ladle Ql) so that it is immersed inside the molten metal αl. At this time, the lifting height is such that the molten metal αd reaches the socket casting part (7) of the casting hole part (6).

Then, the molten metal α between the water cooling jacket (4) and the core (to) is heated by the cooling water flowing inside the water cooling jacket (4).
1 is cooled and solidified, and a socket (2) of the wound in the tube (α) as shown in the figure is formed. When the molten metal 00 solidifies, this solidified portion receives further heat from the water cooling jacket (4) and melts! Since the temperature is lower than Q+3, by checking the detected value of the thermocouple (9), it is possible to determine whether the socket (1) has completed solidification and the subsequent formation of a solidified shell P2°C in the tube body casting section (8). You can confirm completion.

After that, as shown in Figure 3, lower the lifter @ a little,
The level of the molten metal αO is lowered to the tube body casting part (8) so that the socket casting part (7) comes out above the molten metal level. At this stage, the inner surface of the socket (1) is properly grasped and the lifting platform a is slowly raised. Then, the tube body casting section (8) continuously casts a hollow tube body (A) following the socket (2). At this time, the inside of the duct part (a) is opened to the atmosphere through an air vent pipe passing through the core 08, thereby preventing the molten metal αO from being sucked up.

Once the tube layer part (a) has been cast to the specified length, the lifter (
2) to release the molten metal 0d from the mold (3), and then lower the pipe body @
By pulling out the lower end of the mold (3), a tube 01 of a certain length is obtained. After the pipe 09 is removed from the six lifting platforms together with the core, it is transported to the next process.

Effects of the Invention As described above, according to the present invention, it is possible to manufacture a pipe having a socket at one end by continuous casting.Moreover, during casting, the inner shape of the mold is matched to the outer shape of the pipe, and this mold t to control the depth of immersion into the molten metal.
Since it only requires moss, it can be easily worked with simple equipment.

[Brief explanation of the drawing]

First? 3 are front views showing one embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A socket casting part is formed on the upper inner surface of the pipe casting hole formed vertically penetrating through the center of the mold, and a socket casting part is formed below the socket casting part. A tube body casting part is formed on the inner surface of the tube casting hole, a core for forming the socket inner surface is inserted into the upper part of the mold, the mold is immersed in the molten metal up to the socket casting part, and the mold is formed. After the pipe socket is solidified by cooling, the cast part of the socket is removed from the surface of the molten metal, leaving the cast part of the pipe body in the molten metal, and then the pipe is pulled upward together with the core and placed in the socket. A continuous casting method for a tube, characterized in that a subsequent tube body is cast.