JPS5844130B2 - Continuous annealing equipment for rod-shaped or tubular metal materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously annealing rod-shaped or tubular metal materials by induction heating.

Conventionally, when a metal material such as copper is processed using a plastic processing machine such as a pilger mill or reducer, and then subjected to induction annealing, the rod-shaped or tubular metal processing material is fed out at a constant speed from the plastic processing machine. is connected to the above machine,
Immediately introduced into an induction heating annealing apparatus as shown in Figure 1 of the accompanying drawings, where it is heated to a predetermined temperature,
It is held at that temperature for a certain distance and then cooled down.

That is, the induction heating annealing apparatus is composed of an induction heating furnace and a cooling section, and as shown in FIG. An induction heating coil 2 is disposed through the cooling section 6 and is connected to the induction heating furnace.

In such induction heating annealing equipment, the processed metal material (shown as a tubular body in the figure) sent out from the plastic processing machine is introduced into the induction heating furnace and heated until it reaches a predetermined temperature, and at that time, the A temperature measurement window 4 provided in the fireproof insulation material 3 to check the maximum temperature reached by the material.
The temperature is measured using a temperature measuring instrument 5 such as a radiation pyrometer or an optical pyrometer.

However, with the above-mentioned temperature measuring means, the lubricating oil adhering to the surface of the processed metal material in the plastic working machine burns and generates smoke as the temperature of the metal material rises in the induction heating furnace of the induction heating annealing device. Since this smoke comes to blow out from the temperature measurement window 4, there is a drawback that it is impossible to accurately measure the temperature reached by the material in the induction heating furnace.

In addition, the surface of the metal material annealed by the induction heating annealing apparatus has the disadvantage that the above-mentioned lubricating oil causes uneven surface discoloration, which impairs its appearance.

Furthermore, when bright annealing is performed in a reducing or inert gas atmosphere, expensive gases such as nitrogen or argon must be used, and in addition, lubricating oil adhering to the metal material must be removed before annealing. In addition, it is necessary to devise ways to prevent outside air from entering through the temperature measurement window.

The present invention has been made in order to eliminate the various drawbacks found in the conventional induction heating annealing apparatus as described above, and is an object of the present invention to form an atmosphere of superheated steam in the heating section of the induction heating furnace. A continuous method for the above metal materials that makes it possible to continuously and accurately measure the temperature in the heating part of these metal materials while preventing uneven discoloration on the surface of the metal material. The object of the present invention is to provide an induction heating annealing device.

The present invention will be explained in detail below.

The apparatus of the present invention is characterized by comprising a cylindrical induction heating furnace and a cylindrical cooling device connected to the induction heating furnace and equipped with a cooling water spray ring and a steam suction port. A distribution pipe for distributing superheated steam, which is equipped with a blower fan and an inlet and an outlet for superheated steam, is disposed between the induction heating furnace and the cooling device.

Embodiments of the present invention will be specifically described below with reference to FIG. 2 of the accompanying drawings.

FIG. 2 of the accompanying drawings is an explanatory diagram illustrating the induction heating annealing apparatus of the present invention.

Note that FIG. 3 is an explanatory diagram illustrating one embodiment of the temperature measurement window provided in the induction heating furnace of the apparatus.

In Fig. 2, H is a cylindrical induction heating furnace, and C is a cylindrical cooling device. An induction heating coil (water-cooled steel pipe) 2 is disposed through the coil 1 .

Reference numeral 4 denotes a temperature measuring window provided in the fireproof insulation material wall 3, and a heated air inlet 13 and a heated air outlet 14 are attached thereto.

5 indicates a temperature measuring instrument in the window 4. In addition, 8
indicates the outlet for superheated steam.

The cooling device C is composed of a cooling chamber 6 and a cooling water spray ring 15 disposed within the chamber, and is provided with a steam suction port 12 near the inlet thereof.

Note that 18 indicates a cooling water outlet.

The apparatus of the present invention is provided with a flow pipe P between the induction heating furnace H and the cooling device C for introducing superheated steam generated in the cooling device C into the induction heating furnace H.

This flow pipe P is equipped with a superheated steam suction port 10 in a communication section with the cooling device C, a superheated steam outlet 9 in a communication section with the induction heating furnace H, and the superheated steam suction port 1
A blower fan 11 is provided near 0 to promote introduction of superheated steam into the furnace.

To carry out annealing using the apparatus of the present invention configured as described above, the metal material to be annealed, for example, the copper tubular body 7, is fed into the induction heating furnace H, and the induction heating coil 2 is fed into the induction heating furnace H.
The material is heated to a predetermined temperature, passed through the furnace while maintaining the heating temperature, and guided to the cooling device C, where it is cooled to around room temperature by cooling water spouted from a cooling water spray ring 15 provided in the cooling device. .

Water vapor is generated during this cooling, so this water vapor is
When superheated steam is drawn into the above-mentioned flow pipe P through the steam inlet 12 provided near the inlet of the cooling system by the operation of the blower fan 11 attached to the flow pipe P for superheated steam disposed between the induction heating furnace and the cooling system, the steam is drawn into the flow pipe P. The steam comes into contact with the metal material that is still in a high temperature state and turns into superheated steam, which flows through the distribution pipe P via the superheated steam suction port 10 provided in the distribution pipe P and reaches the superheated steam outlet 9. is introduced into the induction heating furnace.

This introduced superheated steam is sent into the refractory insulation wall 3 of the induction heating furnace, and is successively discharged from the discharge port 8 while maintaining the inside of the furnace in a superheated steam atmosphere.

Therefore, superheated steam flows over the surface of the metal material in the furnace, and even if the lubricating oil adhering to the material burns and smokes during the initial stage of heating the metal material in the induction heating furnace, the overheating Since the flow direction of the steam is opposite to the material feeding direction, the smoke does not reach the temperature measurement window 4 provided in the induction heating furnace H, and uneven discoloration on the material surface due to lubricating oil occurs. can also be prevented.

In addition, in the present invention, the temperature measurement window 4 is provided with a heated air inlet 1.
3 and an air outlet 14 are provided, so this air outlet 14
A heated air barrier layer is formed by feeding heated air at a temperature of 100° C. or higher and sucking it in through the suction port 13 on the opposite side.

Therefore, the superheated steam in the induction heating annealing zone will not blow out from the measurement window 4 and come in contact with the outside air, resulting in a temperature drop and becoming cloudy, so that temperature measurement at the measurement window will not be hindered by the cloudiness. There isn't.

Note that the above-mentioned heated air can be easily generated by combining an electric heater and a blower.

In addition, in the present invention, as described above, since a layer of superheated steam and heated air is formed between the temperature measurement window 4 and the temperature measurement instrument 5, superheated steam and heated air are A slight temperature correction will be made.

This makes it possible to accurately measure the temperature of the metal material in the induction heating furnace H.

Further, the heated air layer is formed in the same manner in the design shown in FIG.

In addition, FIG. 3 shows a modification of the temperature measurement window 4 provided in the refractory insulation material wall 3 of the induction heating furnace H. In the figure, 16 indicates a heated air inlet, and 17 indicates a heated air outlet. are shown respectively.

As described above, according to the present invention, an atmosphere of superheated steam is formed in the annealing zone in the induction heating furnace H, so that there is no need to use expensive gases such as nitrogen or argon as in the prior art. It is possible to obtain an annealing effect similar to that obtained by forming an atmosphere of these gases, and the amount of superheated steam supplied can be controlled by adjusting the rotation speed of the blower fan 11. Since the maximum temperature of the metal material at H can be measured continuously and accurately, there is an advantage that stable annealing work can be carried out.

[Brief explanation of the drawing]

FIG. 1 of the accompanying drawings is an explanatory diagram of a conventionally used induction heating annealing apparatus for copper and copper alloy pipes, and FIG. 2 is an explanatory diagram showing an example of the induction heating annealing apparatus of the present invention.
FIG. 3 is an explanatory diagram illustrating one embodiment of the heated air outlet and suction port in the temperature measurement window of the device of the present invention. In the figure, 1...Induction heating coil interlayer insulation material, 2...Induction heating coil, 3...Fireproof insulation wall, 4...For temperature measurement. Window, 6...
・Cooling chamber, 7... Metal material to be heated and annealed, 8...
...Superheated steam outlet, 9...Superheated steam outlet, 10...Superheated steam suction port, 12...
...Steam inlet, 13.16...Heated air inlet, 14,17...Heated air outlet, H
...Induction heating furnace, C...Cooling device, P
・・・・・・Superheated steam distribution pipe.

Claims (1)

[Claims] 1 Consists of a cylindrical induction heating furnace and a cylindrical cooling device connected to the induction heating furnace and equipped with a cooling water spray ring and a steam suction port, and a blower is installed between the induction heating furnace and the cooling device. 1. A continuous annealing device for rod-shaped or tubular metal materials, characterized by having a fan and a flow pipe for distributing superheated steam, which is equipped with an inlet and an outlet for superheated steam.