JPS5930444A - Method and device for thickness increase-working of pipe - Google Patents

Abstract

PURPOSE:To increase thickness uniformly without irregular deformation, by heating successively and locally a thickness increase-working part of a pipe, compressing the pipe at a constant speed in the axial direction, and executing the compression under a narrowed deforming area of the pipe by local heating. CONSTITUTION:A thickness increase-working device is constituted of a stepping cylinder 6 for compressing a pipe 1 at a constant speed in the axial direction by a spindle 7, and a ring-like heating coil 13 which is placed so as to be positioned in the outside circumference of the pipe 1 and can move along the axial direction of the pipe. In this state, when executing the thickness increase-working of the pipe, the thickness increase-working part of the pipe 1 is heated locally, its heating position is moved successively along the axial direction of the pipe 1, compressive force for compressing the pipe 1 at a constant speed is loaded by the stepping cylinder 6, and also the deforming area of the pipe by compressive force is narrowed by local heating of the heating coil 13, by which irregular deformation is prevented.

Description

[Detailed Description of the Invention] The method and apparatus for increasing the thickness of the tube 11 in the answer to 11th of this article are related to the method and device for increasing the thickness of the tube toward υ, '11t, and t'f. The present invention relates to a pressurization method and device.

Conventionally, as a method for increasing the thickness of a pipe, IIq11 of the pipe is
A method is known in which swaging is performed by applying a compressive force in the direction of the pipe to increase the thickness of the pipe.

FIG. 1 is a perspective view showing a material whose thickness has been increased by a conventional method of increasing its thickness.

In FIG. 1, ■ is a tube, and 2 is an irregular deformation such as buckling or wrinkles that has occurred in this 771.

As is clear from Fig. 1, if only applying compression force and performing -C swaging processing, that is, semi-pure compression processing, irregular deformation 2 such as buckling and wrinkling of the pipe IK will occur, resulting in uniform expansion. 4) This was the cause of defects.

The present invention eliminates the drawbacks of the prior art described above and solves the problem of buckling and
It is possible to achieve uniform thickness increase I without irregular deformation such as wrinkles,
Its purpose is to provide a method for thickening pipes and an apparatus that can be directly used in the implementation of Hf).

I of the pipe thickening processing method according to the present invention (4 composition is t”: I
Thickening of 1. By applying a compressive force to compress the tube at a constant speed while locally heating the part J for j times, applying a compressive force 111 to compress the tube at a constant speed. , the thickness increase is 1:F?t μm.The thickness increase is 7.

・t/c Thickening according to the present invention [: equipment ((1 product t):
The spindle is equipped with a stepping cylinder that can freeze the tube at a constant temperature and pressure of 4flii in the axial direction. It has two circular heating coils that move in directions 1 and 11.

Starting with the description of a practical example, basic matters related to the pipe wall thickness increasing method 1]j of the present invention will be explained.

When increasing the thickness of 1'I'', simple /E shrinking cannot progress the deformation over the entire 1'I''. Deformation occurs easily.

In order to prevent this 1. straightening deformation 11-, the pipe thickness increase +o' TI method d1 of the present invention is to locally increase the thickness of the pipe where the thickness should be increased. Heating part 2, its heating part i1'71'?i)'i,7 (
1) QQIIJj direction rn -) -CI>Move next C), previous 1iL? ``!'' at a constant floor level J, E is applied to the unnecessary contraction force, and the local heating narrows the deformation area of the pipe due to the contraction force (1f).
2. By narrowing the deformation area (for example, narrowing it to 2 times or more in pipe handling), it is possible to eliminate the irregular deformation and achieve uniform thickness increase and pressure. ;) Ru.

Hereinafter, the present invention will be explained by examples.

FIG. 2 shows a method for increasing the thickness of a pipe according to an embodiment of the present invention. FIG. 5 is a cross-sectional view showing an example of a stomach device used for increasing the thickness of a tube used on the face, and a tube to be thickened using the device.

In this Figure 2, 1d1, the evening that should be increased by 1.1, and 4 are? A press head 3U] 1 is provided with a part 4a (facing Ld) for positioning one end of 8'I, and a stepping cylinder 6, which will be described later, is installed on that 1ljll (on the left side IT in FIG. 2). 1., 5
This is a support that can receive the reaction force of the compressive force described in 1). Further, the support column 51) also serves as a guide for movement of the toe/steel 12 in the force direction, which will be described later.

]:3&. I. A ring-shaped heating coil that is disposed around the outer periphery of the tube 1 and can heat the tube 1. This heating coil 13 is connected to a transformer 12 and I
It is movable along the ill + direction of the tube 1 at /l (and is movable along the ill + direction of the tube 1, and the heating coil cooling A part of the cooling water 14 of [l] is directed toward the pipe 1 at an angle of 45
.

Direction-＼Spout j-The injection ports 13a of the stone reservoir are distributed in the circumferential direction and are drilled at 7. Still, a two-color temperature sensor I (not shown) that can detect the temperature of the heating part of the heating coil 13 is attached integrally to this heating coil 13. is a transmitter part (1) that emits a signal when the temperature of the heating part reaches the set temperature P
(not shown) is provided.

15C1, a cooling water pipe that supplies cooling water 14 to the heating coil 13;

16], a high frequency transmitter that generates a high frequency current, 1
2 i=. I: A transformer that adjusts the magnitude of the high-frequency current supplied to the heating coil 13 by T1. A drive unit is provided with a relay switch (not shown) that turns OFF in response to a signal from the heating coil, and a heating coil moving speed dial (not shown). If the speed setting dial is set to a predetermined speed in advance, when the relay switch is turned on, the support 5
1), the heating coil 13 can be moved forward i~ in the direction of the arrow along the axial direction of the tube 1 at the predetermined speed.

11 is a control device, and this control device is actually the previous RC-'
1 by the signal from the color temperature law (not shown)
7Z Nari, mentioned later Surimitsuisoji 17 from Yu>j
Relay switch that becomes OFT- (illustrated nano'')
and a spindle drive speed setting dial (not shown), and if the spindle and drive speed setting dial are set to a predetermined speed in advance, the relay switch is turned on.
When K, a predetermined number of pulses can be generated per unit time.

1. OL 12, a unit pulse generator generated by the control device 11, a stepping motor that rotates by a rotation angle of 711, 9 &, l1, by the action of the stepping motor 10, the control device: '〆I: 11 is The number of pulses generated per unit pulse,
Predetermined oil Ijj'*, hydraulic piping, I, hydraulic pressure generating device that sends from 8a to stepping/linda 6 (details will be described later), 1
8" is a hydraulic pipe that returns oil in this one phase, and 6 is a hydraulic pipe 18, which is proportional to the oil discharge per unit time that flows in from the hydraulic pipe 18 (in other words, the spindle drive speed setting die). ′
By setting the oil at a specified speed, the amount of oil per unit time,
Since kl is constant, it is a stepper/linda that can extrude one spindle 7 (at a constant speed).

At 1ft, the heating coil 13 finishes heating at the end of the thickened pressurizing part, and the transformer 12 contacts this and closes, producing a signal.

The signal from the Riminoto Suite 17 is transmitted to the transformer 12
Relay switch, high frequency oscillator 16. Control ii! 1, the transformer 12 and the stepping motor 10 stop, and the high-frequency oscillator 1G stops generating high-frequency current.

Next, configure as above 7゛: Vinegar thickening Jl %
The operation of ii"i" will be explained.

First, the spindle 7 of the stepping/linder 6 and the transformer 12 are moved backward. Pass the tube 1 to be thickened and pressurized into the heating coil 13, insert its - end into the positioning part 4a of the press bed 4, and insert the flft end into the support jig 8 by moving the spindle 7 forward in the direction of the arrow. Fix it with. Move the transformer 12 forward in the direction of the arrow until the heating coil 13 reaches one end of the thickened part of the housing 1.

The setting temperature for the two-color temperature (J" shown in the figure) of the heating coil 13 is set to a predetermined temperature. The moving speed of the heating coil is also controlled by the heating boiler moving speed setting dial (not shown) of the transformer 12. Apparatus C: Set the spindle drive speed using the spindle drive speed setting dial (not shown) at 11.
Each is set in advance.
;ziS concrete +4'! (Explained from Ii2).

High amount? Turn on the skin exfoliator 1G and turn on the heating coil 1:3.
At the same time as starting high-frequency induction heating of the tube 1 by the cooling water vibrator 15, cooling water 4 is supplied from the cooling water vibrator 15 to the heating coil 13.

When the temperature of the heating section of the tube I heated by the heating coil 13 reaches the predetermined temperature, a signal is output from the transmitting section of the two-color thermometer (not shown), and this is triggered by the controller J 11. It is received by a relay switch (not shown) and a relay switch (not shown) of the drive section of the transformer 12 . Then, the control device 1 is turned on and generates a predetermined number of pulses per V time corresponding to the preset spindle drive speed 1, and the stepping motor 10 receives the pulses.
The hydraulic pressure generating device 9 rotates by a predetermined rotation angle per P pulse (generated by the cutting surface 1 device 11), and the hydraulic pressure generating device 9
1 is out! A predetermined hydraulic pressure per IE boost pulse is sent from the oil j port Iiα tank 18n to the stepping cylinder 6,
Stepping/linder 6 rJ2, (llll pressure distribution saving 18
; Flow from I, input sea, pump ζ oil - CX spindle 7
is extruded at the preset driving speed,
/1, L)c' chamber 1 is compressed in the axial direction at a constant speed.

- Note, the relay switch of transformer 12 is also turned on, and the lance moves in the direction of the arrow at the speed set in II'), and heats arm 1 at the constant temperature of Qi. Continue. In order to make the heating width of the pipe 1 less than about 21 tones of the plate thickness, the water is injected from the IR separate port 13a of the heating = Jf Le 13. Ken 1 戊KYIO ＼゛-ノzo,.

The transformer 12 advances in the direction of the arrow, and the heating tip L
I 3 is 1"; 17 meat increase t; 1! 's song l#i'
When the heating is finished, the lance 12 comes into contact with the limit switch 17, and the transformer 12 and stepping motor 10 stop.
1, 4.5 frequency '1 (Stop the generation of 5 flows, and finish the thickening process of the pipe 1.

After that, after the pipe 1 has cooled down, the supply of cooling water 4 is completely stopped, and the pipe 1 which has been subjected to the thickening process is taken out.

FIG. 3 is a perspective view showing an example of a pipe which has been subjected to a wall-thickening process as shown in FIG.

In this FIG. 3, reference numeral 19 denotes a thickened pressurizing section of the pipe 1, and the thickening rate of this thickening pressurizing section 19 (tj uniform and -4,
Irregular deformation (,1, not at all.

In this way, the heating coil 13 moving along the axial direction of the tube 1 is applied to the tube 1 at a constant speed while successively locally heating the thickened pressurizing part of the tube 1 with L. ．． By applying compressive force to the pipe 1 with the moving spindle 7 and adding 1 Δ, it is possible to uniformly increase the thickness of the tube 1 by increasing the thickness of the tube 1 at a predetermined rate of increase in thickness. .

Next, a specific example will be described.

W: 1 outer diameter 21.6 mmφ, plate thickness 8.6 m
m, length 55 Il+ carbon steel pipe, length 500 mm
A case will be described in which the thickness is increased and pressurized at a thickness increase rate of 31%.

The conditions for high-frequency induction heating by the heating coil 13 are frequency: 3. (10011 power output 85 KW, heating temperature 8
50, and the moving speed of the heating coil 13 is still 1rnm.
/mm What happened?

Regarding the setting of the driving speed of the spindle 7, the L1 fourth
A preliminary experiment was conducted as shown in the figure.

Figure 4 is a spindle, drive speed-thickness increase rate relationship diagram showing an example of the relationship between the spindle drive speed I and the thickness increase rate when the moving speed of the heating coil is kept constant. .

In FIG. 4, reference numeral 20 indicates the relationship between the driving speed of the spindle Il and the thickness increase rate when the moving speed of the heating coil 13 is 1 mm/mm.

As is clear from Fig. 4, in order to increase the thickness increase rate to 31%4, the driving speed of the spindle 7 must be increased by 0.3 mnv'mi.
It may be n.

” - Setting the conditions described above and using the thickness increasing processing apparatus according to Fig. 2 to increase the thickness of the carbon steel pipe-1, the desired thickness increase rate of 31% was achieved. , it was possible to perform thickening processing without irregular deformation.

The embodiment described below has the following effects.

(J) Thickening processing method for pipes that can achieve uniform thickening without irregular deformation and can be dried, and thickening JJII
All equipment can be installed.

(2) j iLk,L in the pipe wall thickening processing method of this example
,? Since it is possible to uniformly thicken any position of "+" L, it is possible to reduce the thickness by secondary processing (for example, bending
．． .

When performing burring (burring, tube expansion, etc.), if the thickness of this second-secondary addition section is increased in advance, the apparent reduction in plate thickness due to plastic deformation can be reduced.

Therefore, since there is no need to use thick-walled pipes, material costs are reduced by 10 to 20%.

(3) According to the pipe thickening processing apparatus of this embodiment, since the spindle 7 that can compress the pipe 1 at a constant speed is provided, irregular deformation occurs in the pipe 1 during the thickening process. There's no fear.

In this embodiment, since the heating coil 13 is provided with an injection port 13a for injecting the cooling water 14, the amount of water injected from this injection port is adjusted by adjusting the amount a:t(,j). , it has the advantage of being able to control the heating width.

Incidentally, even if the injection port is not provided, that is, even if no injection is made, there is little risk of irregular deformation of the tube 1 in practical terms.

As described in detail, according to the present invention, while sequentially locally heating the portion of the pipe to be increased in thickness and pressurized, =tJ
By applying the compressive force that compresses the tube at a speed of one foot and performing the swaging process, the thickness of the thickened section is increased, thereby preventing buckling and undesired deformation due to wrinkles. It is possible to provide a method and apparatus for increasing the thickness of a pipe, which can achieve a uniform thickness increasing force throughout the entire process.

[Brief explanation of the drawing]

Fig. 1 shows the back of the pipe which has been shaved 4 by the conventional wall-thickening processing method. FIG. 3 is a partial cross-sectional view showing an example of a pipe thickening processing device that is used once again to carry out the wall adding method, and a pipe that is thickened and pressurized thereby, and is similar to FIG. 2. An example of a pipe whose wall thickness has been increased using a pipe wall-thickening processing device is shown in perspective rQ. It is a spindle drive speed-thickness increase rate relationship diagram showing 1...-pipe, 6... stepping cylinder, 7...
Spindle, 10... Stepping motor, 11...
- Control full device, 12...transformer, 13...
Heating coil, 13a... blow! '1111, J4...
Cooling water. Agent: Patent attorney Kosaku Fukuda (and 1 other person) District 1: $3/ /F Figure 4

Claims (1)

[Claims] 1.? The thickness increasing pressure method is carried out by carrying out swaging processing by applying a compressive force that compresses the pipe at a constant speed while locally applying pressure to the part 7 where the thickness is to be increased. Thickening of pipes characterized by thickening [Two methods. 2. A stepping cylinder whose spindle can compress the tube at a constant speed in the axial direction, and a stepping cylinder located on the outer periphery of the tube, and II! 1. A pipe thickening processing device characterized by having a ring-shaped heating coil that is movable along the I+1 direction and a 4-ft. :3. The pipe according to claim 2, wherein the heating coil is provided with an injection port for injecting the cooling water for cooling the heating coil toward the pipe. Thickening processing and bulk purchasing.