JPS6333152A - Forming method for hollow metallic tube - Google Patents

Abstract

PURPOSE:To form the sectional shape of cast tube into the optional shape by drawing the cast tube at hot state drawn from a mold toward the axial center of tube, while pressurizing by rollers from plural radius direction of tube. CONSTITUTION:The cast tube 5 formed as solidifying by the hollow part 4 of mold 1 is continuously drawn by pinch rollers 6. And at the same time of passing through an outer shape measuring instrument 7, the outer shape of peripheral part in the tube section is measured. Next, the measuring value is transmitted to the computing element 9 and is operated and the commanded signal is transmitted to each forming roller 8, to form into the prescribed shape at a first stage, and the forming rollers 8 press the cast tube 5 at the necessary pressurized force. And, the cast tube 5 is drawn toward the axial center direction of tube as pressing by the forming roller 8, to form the shape at the first stage. Next, the outer shape of cast tube 5 is measured by an outer shape measuring instrument 10 and the measured value is treated by a computing element 12, and then each forming roller 11 presses the cast tube 5 by the necessary pressurized force. And, the cast tube 5 is drawn as pressing by the forming roller 11, to correct to the true circle. Further, it is formed into elliptical, rectangular sectional shape, etc.

Description

[Detailed description of the invention] Industrial applications The present invention is directed to a method of forming hollow metal tubes.

Conventionally, in continuous casting of hollow metal tubes, a hole of a predetermined shape for casting the cast tube is formed in a mold, and the cast tube solidified in the hole is continuously pulled out to form the cast tube as required. A shaped casting tube was being cast.

Problems to be Solved by the Invention According to the above-mentioned conventional configuration, in order to cast multiple-sheathed hollow metal tubes having different cross-sectional shapes, it is necessary to create holes with shapes corresponding to the cross-sectional shapes of the respective cast tubes. It was necessary to provide separate molds for each.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems and to provide a method for forming hollow metal tubes in which a variety of hollow metal tubes having different cross-sectional shapes can be manufactured using a single mold.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides continuous casting of hollow metal tubes in which a cast tube in a hot state immediately after being pulled out from a mold is cast in the radial direction of the cast tube. The structure is such that the tube is pressurized with rollers from multiple arbitrary directions, and is pulled out in the axial direction of the cast tube to form an arbitrary cross-sectional shape.

Effect In the above configuration, since the cast pipe is in a hot state, fleas and
Easily deformed by pressure with rollers.

Therefore, the cast tube can be continuously formed into any shape simply by continuously drawing out the cast tube while applying pressure with the rollers.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, a mold (1) is placed immersed in molten metal (3) in a tundish (2), and has a casting hole (4) vertically formed in its center. A pinch roller (6) for pulling out the casting tube (5) is arranged above the hole (4) of the mold (1). Pinch roller (
6) Above is a first outer shape measuring device for measuring the outer shape of the peripheral edge of the tube cross section perpendicular to the axial direction of the cast tube (5)! !
(7) is provided. The first external shape measuring device (7) is
Consists of non-contact displacement meters such as laser displacement meters and eddy current displacement meters. Above the first external shape measuring device (7), a cast pipe (5
) is provided with a plurality of primary forming rollers (8) that can contact the casting tube (5) from a plurality of directions and press the casting tube (5) in the radial direction. Each of the primary forming rollers (8) is electrically connected to a first computing unit (9).
) is electrically connected to a first external shape measuring device (7). A second outer shape measuring device QO is provided above the primary forming roller (8), and a plurality of secondary forming rollers aυ are provided further above. Secondary forming roller a
Each of υ and the second external shape measuring device 01> are electrically connected to @2 computing unit @. Next, Figure 2(a)
The primary forming roller (8) will be explained in detail with reference to (b). Each of the primary forming rollers (8) forms a tapered surface that slopes from both ends toward the center at a required angle necessary to correct the cross-sectional shape of the cast pipe (5) into a perfect circle. The axial center α◆ is arranged at right angles to the axial center of the cast tube (5). As shown in FIG. 2(a), a pair of these primary forming rollers (8) are arranged parallel to each other and facing each other, sandwiching the casting tube (5).
Above the casting tube (5), another pair of primary forming rollers (8) are disposed parallel to each other, sandwiching the casting tube (5) between them. They are arranged with their axes α at right angles. The secondary forming roller is arranged in the same manner as the primary forming roller (8).

The effects of the above configuration will be explained below.

A cast pipe (5) is solidified and formed within the hole (4) of the mold (1).
) are continuously pulled out by pinch rollers (6).

The cast pipe (5) that has been pulled out is transferred to the first external shape measuring device (7).
When passing through the tube, the outer shape of the peripheral edge of the tube cross section is measured.

The measured value is sent as a measurement signal to the first arithmetic unit (9), and is subjected to arithmetic processing in the first arithmetic unit (9). and the first
An instruction signal for forming the cast pipe (5) into the first required shape is sent from the computing unit (9) to each of the primary forming rollers (8). Based on the sent instruction signal, each of the primary forming rollers (8) presses the casting tube (5) with a required pressure. Then, the casting W(5) is the first
The cast tube (5) is pulled out in the tube axis direction while being pressed by the next forming roller (8), and is formed into the first desired shape. The molded cast pipe (5) is the second external measurement device! t0
0, the outer shape of the peripheral edge of the tube cross section is measured again. The measured value is sent to the second computing unit (6) as a measurement signal.
and is processed by the second arithmetic unit (6). Then, an instruction signal for forming the cast pipe (5) into the final desired shape is sent from the second computing unit υ to each of the secondary forming rollers αp. In response to the sent instruction signal, each of the secondary forming rollers αD presses the casting tube (5) with a required pressure. Although the cast pipe (5) is arranged with a presser on the secondary forming roller αυ, it may be pressed up to the first order, or even 8 times, depending on the cross-sectional shape of the cast pipe to be formed.
It may be arranged more than the following.

Hereinafter, the shape and arrangement position of a forming roller showing another embodiment of the present invention will be explained.

FIGS. 8(a) and 8(b) show the case where the cross-sectional shape of the tube of the casting 'fig (s) is formed into an oval shape. In this case, as shown in FIG. 8(a), one primary forming roller α is used to form the cast pipe (5) into the primary forming shape from both ends toward the center. A pair of cylindrical primary forming rollers (19a)(1
9b) are arranged so as to sandwich the casting pipe (5) at a required angle. As shown in FIG. 8(b), one secondary forming roller (1) has a tapered surface (
A pair of cylindrical secondary forming rollers (22a) and (22b) are placed opposite to this at a required angle necessary to form the cast pipe (5) into the shape of the final size. The casting tube (5) is placed between them.

FIG. 4 shows the case where the cross-sectional shape of the cast pipe (5) is formed into an elliptical shape. A pair of forming rollers 4 have tapered surfaces (c) that are inclined at a required angle from both ends toward the center.
are formed and are arranged parallel to each other to sandwich the casting tube (5). The other pair of forming rollers (6), which are arranged parallel to each other with the casting tube (6) in between, are formed into a cylindrical shape, with the axis (e) forming a tapered surface. The forming roller is arranged perpendicularly to the axis of the formed forming roller.

FIGS. 5(a) and 5(b) show the case where the cross-sectional shape of the cast pipe (5) is formed into a rectangular shape. The primary forming roller (G) has a cylindrical shape and is arranged around the casting pipe (5).
The axes of adjacent primary forming rollers are arranged at right angles to each other. The secondary forming rollers (to) have a cylindrical shape, and are arranged in pairs in each of the four orthogonal directions around the casting tube (6), and the pair of forming rollers (80g) (80b) are mutually arranged. are arranged at an angle to each other.

Effects of the Invention As described above, according to the present invention, the cross-sectional shape of the cast pipe can be formed into an arbitrary shape by pressurizing the cast pipe in a hot state with rollers.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram showing one embodiment of the present invention, Figure 2 is a diagram showing the shape and arrangement position of the rollers when forming a tube into a perfect circle, and Figure 8 is a diagram showing the shape and arrangement position of the rollers when forming a tube into an oval shape. Figure 4 is a diagram showing the shape and position of the rollers when forming the tube into an oval shape, and Figure 6 is a view showing the shape and position of the rollers when forming the tube into a rectangular shape. It is a figure showing a shape and arrangement position.

Claims (1)

[Claims] 1. In continuous casting of hollow metal tubes, a hot cast tube that has just been pulled out of a mold is pressurized by rollers from multiple arbitrary directions in the radial direction of the cast tube, and A method for forming a hollow metal tube, which is characterized by drawing the tube in the axial direction and forming it into an arbitrary cross-sectional shape. 2. The method for forming a hollow metal tube according to claim 1, wherein the cross-sectional shape of the cast tube is corrected into a perfect circle by applying pressure with a roller. 3. Controlling the pressing force of the rollers based on the outer shape of the peripheral edge of the tube cross section perpendicular to the axial direction of the cast tube, which is measured by a non-contact displacement meter immediately before being pressurized by the rollers. A method for forming a hollow metal tube according to claim 1 or 2, characterized in that: