JPS59166625A - Heat treatment apparatus for tubular body - Google Patents

Abstract

PURPOSE:To enhance the stress corrosion cracking resistance of a tube, by cooling the tube subjected to solution heat-treatment from the inside thereof with water while removing the stream film formed between the inner peripheral surface of the tube and cooling water by rotating a propeller. CONSTITUTION:A tube 1 to be subjected to solution heat-treatment is heated to be held at a solution heat-treatment temp. and, directly after heating, the flexible connecting coil 8 of a stirrer 4 is inserted into the tube 1 while each propeller cover 11 of said stirrer is moved along the inner peripheral surface of the tube 1. In the next step, water cooled by a cooling apparatus is injected and supplied into the tube 1 from a nozzle 2 and, at the same time, the coil 8 is rotated by a drive device 7 to rotate each propeller 10. Whereby, the steam film being apt to be formed between the inner peripheral surface of the tube and cooling water 3 is removed by the turbulent flow of the stirred cooling water 3. The cooling water 3 after cooling is collected by a receiving tray and recirculated to the cooling apparatus to be reused. By this method, compression residual stress is generated to the inner peripheral surface of the tube 1 to enhance the stress corrosion cracking resistance of the tube.

Description

[Detailed description of the invention] The present invention relates to a tube heat treatment apparatus.

For example, when a stainless steel pipe is subjected to solution treatment, the pipe is conventionally heated and maintained at a solution temperature and then placed in a water tank. However, according to this method, the amount of water that enters the pipe is limited and the γAL velocity of that water is small, so the temperature of the water in contact with the inner circumferential surface of the pipe is lower than the temperature of the water on the outer circumferential surface of the pipe. The problem was that it was expensive. Therefore, the cooling rate of the inner circumferential surface of the pipe is slower than that of the outer circumferential surface, resulting in the generation of tensile residual stress on the inner circumferential surface of the pipe. This tensile residual stress has an adverse effect on the improved stress corrosion cracking resistance. In addition, in order to solve this problem, a method has been proposed in which cooling water is passed through the pipe and cooled from the inside of the pipe without putting the pipe into a water tank. There was a time when a film of water vapor was formed between the inner peripheral surface of the pipe and the cooling water, and the cooling effect was not sufficient.

The present invention aims to solve such problems, and includes a connecting coil whose one end is interlockingly connected to a moving vehicle and inserted into a pipe to be dismantled, and a connecting coil that is attached to the connecting coil at appropriate intervals. a propeller cover that is loosely fitted into the connected coil so as to surround each propeller, and that is provided with cooling water flow holes at least on its upper and lower surfaces, provided on the outer peripheral surface of each propeller cover,
A pipe body comprising a guide roller that guides the propeller cover along the inner circumferential surface of the pipe to be subjected to solution treatment, and a nozzle that supplies cooling water into the pipe from an opening at one end of the pipe to be subjected to liquid bath treatment. This objective is achieved by providing a heat treatment device, which generates compressive residual stress on the inner circumferential surface of a pipe to be solution treated, thereby increasing stress corrosion cracking resistance. .

Hereinafter, the structure of the present invention will be explained in detail based on the drawings showing one embodiment thereof.

FIG. 1 is a simplified illustration of the heat treatment system for an M body and its cooling water (i-ring system) according to the present invention.

In the figure, (1) is the solution treatment pipe heated to the solution treatment temperature, and (2) is the solution treatment pipe (1).
A nozzle that supplies cooling water (3) into the pipe from the upper end opening, (4) is a cypress stirrer that blows the cooling water (3) inserted into the pipe to be solutionized (1), The tube heat treatment apparatus according to the present invention includes these nozzles (2) and the coffin stirrer (
4). (5) is a tray that collects the cooling water (3) discharged from the lower end of the vibration integrated treatment vibrator (1), and (6) is the cooling water from the receiver 1111 t51 (
3) and a pump and cooling device X that cool the water and introduce it into the nozzle.

The tubular heat treatment apparatus according to the present invention thus employs a method of cooling the wave bath general-purpose pipe (1) from the inside.

The main parts are shown enlarged in FIG. 2 and FIG. 31C.

In the figure, (7) is the ridge of the motor φ! 411 aircraft, (8
) is a flexible connecting coil whose one end is interlockingly connected to the befldr, j, e (7) via a transmission (9), and the connected coil (8) is
What's inside the pipe (1)? f The vibrator has been inserted reaching the bottom end. (IG is a propeller attached to the connecting coil (8) at appropriate intervals, (11) is a propeller cover loosely fitted to the connecting coil (8) so as to surround each propeller (8), and the propeller Cooling water flow holes O4 occupying a large area of 1 pn are provided on the upper and lower surfaces and the outer peripheral surface of the cover (Ill).(13) is for each propeller cover II.
) is used to guide the propeller cover 11) to the inner circumferential surface of the liquid bath treatment pipe (1). Although the guide roller (13) is shown in the figure as rotating only in the vertical direction, it may be rotatable in a 360° direction using casters (ball casters) or the like.

With this formation, the following actions will be explained. First, the pipe to be solution treated (1) f is heated to a temperature of 1100° C.
), and after this, iσg, the pipe to be solutionized (
1) Insert the connecting coil (8) of the stirrer (4) and its respective propeller covers (11) into the inner circumference of the pipe. Since the connecting coil (8) is a town note,
There is no problem in inserting not only a straight pipe but also a curved pipe as shown in FIGS. 1 and 2. Next, the water (3) cooled by the cooling device (6) is poured into the nozzle (2).
At the same time, the connecting coil (8) of the stirrer (4) is driven into the liquid bath (7).
) to rotate each propeller 00. Then, when the cooling water (3)"f is supplied into the pipe (1) for solution treatment, the output of the cooling water (3) from the IN surface of the pipe is 1.
Water vapor J5y is about to be emitted, but this water vapor is removed by the turbulent flow of cooling water (3) stirred by the propeller (1o). Therefore, the cooling effect is kept constant. Note that the propeller q (while the propeller j is rotating, the propeller cover 111) stops or rotates slowly at random due to the water flow. The cooling water (3) that has finished cooling the solution treatment pipe (1) is placed in a saucer (
It is collected in step 5) and guided to the cooling device ↑G (6) again for reuse.

As described above, according to the present invention, a method is adopted in which the to-be-dissolved body Niji Vibrator is cooled from the inner eye 11, and the water vapor 11 formed between the inner peripheral surface of the pipe and the cooling water is removed by the rotation of the propeller. And so. In this way, compression residual force is generated on the inner circumferential surface of the vulcanized pipe, and stress corrosion cracking resistance can be increased.

[Brief explanation of drawings]

The first page of each page shows an embodiment of the present invention, the first page is a schematic diagram of the tube heat treatment equipment and its cooling water circulation system, and the second page is the title of the tube heat treatment section. 1 is a cross-sectional view, and Figure 3 is an enlarged oblique view of the main parts of the tubular body heat treatment apparatus. ...Cooling water, (4)...Stirrer, (7).
・・Drive, 1.3, (8) ・・Connection coil, QCj・
...Propeller, circle...Propeller cover, (I2)...
・Cooling water flow hole, (I3)...Guide roller agent Yoshihiro Sumoto

Claims (1)

[Claims] 1. One end of the coil is connected to the driving machine, and the connecting coil is inserted into the liquid solution processing vibe, and the propellers are attached to the connecting coils at appropriate intervals, and each propeller is surrounded. A propeller cover that is loosely fitted to the connecting coil and has cooling water flow holes on at least the upper and lower surfaces thereof, and a propeller cover that is provided on the outer cylindrical surface of each propeller cover and that is attached to the inner circumferential surface of the pipe to which the propeller cover is subjected to solution treatment. and a nozzle for supplying cooling water into the pipe from an opening at one end of the pipe to be solutionized.
Shi processing equipment-0