JPS6039734B2 - Immersion hardening equipment for steel pipes - Google Patents

Description

[Detailed description of the invention] The present invention relates to a steel pipe bond bidding device.

One of the methods to make steel pipes high-strength and high-grade is to use quenching and tempering treatments, similar to other steel products.

BACKGROUND ART Conventionally, as a method for quenching steel pipes, a method of quenching a heated steel pipe by immersing it in water has been known. In this case, it is necessary to uniformly heat the inner and outer surfaces of the steel pipe, so if the entire steel pipe is simply immersed in water, the surface of the steel pipe will be covered with a vapor film caused by boiling of the cooling water.
The cooling rate of the tube becomes slower than the critical cooling rate for martensitic transformation required for normal quenching, making it impossible to obtain a quenching effect. In order to remove this steam film, high pressure water is injected onto the inner and outer surfaces of the steel pipe. However, in conventional bond hardening equipment, it is difficult to align the center of the steel pipe placed in the water tank with the inner cooling nozzle, and it takes time. Furthermore, in the past, since the heated steel pipe was directly dropped into the water from above the tank, there was a concern that the steel pipe would hit the bottom of the tank or the pedestal in the tank, damaging the outer surface of the steel pipe. In order to avoid this, even if the steel pipe is slowly immersed in water while being held by some sort of gripping device, the lower part of the steel pipe will cool first, causing unevenness and bending. Since the steel pipe before quenching is heated, there is also the problem that if the steel pipe is held loosely, the outer surface of the steel pipe may be damaged by the gripping claws or the like. The present invention has been made in order to solve various conventional problems in bond quenching of steel pipes.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a bond immersion hardening apparatus according to an embodiment of the present invention.

Note that this figure was cut along a plane perpendicular to the longitudinal direction of the steel pipe set for hardening. First, with reference to FIG. 1, the portion of feeding the steel pipe to the bonding device will be briefly explained. The heated steel pipe 1 is conveyed along the conveyance line in the longitudinal direction (direction perpendicular to the plane of the drawing) by V-shaped conveyance rollers 2, and is stopped at the side of the brazing device. A feed-in skid 4 and a jump arm 3 are provided on the side of the hardening device between the hardening device and the conveying line. The steel pipe 1 on the conveying roller 2 is scooped out onto the carry-in skid 4 by the jump-out arm 3, and is rolled on this skid and transferred onto the rotating roller 9 of the steel pipe holding device according to the present invention. The steel pipe holding device includes a presser roller drive device that moves a pair of presser rollers 8 close to each other up and down, a pair of rotating rollers 9 that are close to each other,
It has a presser roller position adjustment device 30 that moves the presser roller drive device in the tube longitudinal direction.

The rotating roller 9 is supported on the tip of the lower arm 7a of the rotating device, and is rotationally driven by a rotating motor (not shown),
As a result, the steel pipe 1 and the presser rollers 8 pressing the steel pipe 1 against the rollers 9 also rotate. The press roller 8 is rotatably supported at the tip of the piston rod 17 of the press cylinder device 16. The cylinder device 16 is fixed to the tip of the upper arm 7b of the tilting device. The upper and lower arms 7b and 7a of the rotating device are fixed to a rotating shaft 6. The rotating shaft 6 is supported by the pedestal 5, and is reversibly rotated (reciprocatingly rotated) within a predetermined angular range by an electric motor (not shown) provided outside the water tank 11. Note that this structure will be further described later. Further, a jump arm 10 as shown in the drawing is attached to the lower arm 7a. A plurality of such steel pipe holding devices are provided along the longitudinal direction of the steel pipe 1 at appropriate intervals. A high-pressure water injection nozzle 40 is fixed to the shaft end of the rotating shaft 6 of the rotation device, and is positioned and adjusted so as to be coaxial with the steel pipe 1 on the rotating roller 9. Note that in the cross-sectional position of this figure, only four high-pressure water injection nozzles are visible. A water tank 11 is arranged below the steel pipe holding device.

A receiving arm 14 having a concave steel pipe receiving portion is pivotally supported within the water tank 11 so as to rotate within a predetermined angular range. Also, a circulating conveyor device 1 whose entire lower half is immersed in water in a water tank and whose upper portion only protrudes obliquely upward from the water surface 18.
5 is provided. This conveyor device is constructed by, for example, an endless chain 20 wound around subrockets at both ends, and a plurality of steel pipe receiving hooks 19 attached to the outer surface of the chain at predetermined intervals. The endless chain 20 rotates in the direction of the arrow shown by the rotation of the sprocket.
Near the upper end of the conveyor device, an aerial conveyance device for the hardened steel pipe 1 is provided. An underwater skid 21 is provided between the receiving arm 14 and the conveyor device 15 for rolling/transferring the steel pipe 1 discharged from the receiving arm 14 to the conveyor device 15. The rotary roller 9 supported by the lower arm 7a of the rolling device is in the air position shown in the figure when it receives the steel pipe 1 that has rolled on the carry-in skid 4, and from this position the rotary roller 9 is rotated by the rotation of the rotary shaft 6. axis 6
It rotates in the direction of arrow A about the center, immerses in water, stops near the upper limit position of the receiving arm 14, and reciprocates between these positions by forward and reverse rotation of the rotary shaft 6. Inside the water tank, external headers 13 open along the travel path of the rotating loaf 9 and on both sides thereof. High-pressure water is injected from the closed end of the outer header 13 toward the outer periphery of the steel pipe in the water. Next, the steel pipe holding device of this embodiment will be explained in detail with reference to FIGS. 2 and 3. FIG. 2 is an enlarged side view of the steel pipe holding device, and FIG. 3 is a partial front view seen from the direction of arrow F in FIG. A plate-shaped guide portion 22 extending in the longitudinal direction of the steel pipe 1 is attached to the upper arm 7b of the tilting device. The main body 23 of the presser loaf drive device has a U-shape on both sides of its base, and the guide portion 2 is disposed within this U-shaped base 24.
2 is being played. A pair of fixing cylinder devices 26 are attached to the back side of the main body 23. A hole 27 passing through the U-shaped portion is formed in the U-shaped main body base 24 , and a piston rod 28 of the cylinder device 26 is inserted into this hole 27 .
is inserted. The piston rod 28 has the guide portion 22
A concave notch 29 is formed which is wider in the middle than the thickness of
The green side of the guide portion 22 is adapted to fit into a concave notch 29 in the piston rod. The aforementioned cylinder device 16 for pressing the presser roller 8 against the steel pipe 1 on the rotating roller 9 is attached to the main body 23. The presser roller position adjustment device 3 is held on a pedestal 5.

The frame 5 has a slide guide portion 31 extending in the longitudinal direction of the steel pipe.
is attached, and a slider 32 is slidably held on this slide guide portion 31. A feed screw 33 is installed along the slide guide part 31, and the slider 3
A feed nut 34 that is screwed into the screw 33 is fixed to the screw 33, and the feed screw 33 is rotated by a motor 35 held on the pedestal 5, and the slider 32 is moved along the guide portion 31 by the screw action working together with the nut 34. It is designed to be moved. The slider 32 has a presser loaf drive device body 23.
A pair of arm portions 36, 36' extending to both sides of the frame are attached. As clearly shown in FIG.
There is a slight gap in the longitudinal direction between 36' and the main body 23. In the above-described structure, during normal operation, the piston rod 28 is drawn into the cylinder by the urging force of the fixing cylinder device 26 of the presser roller drive device, and the piston rod 28 is drawn into the cylinder by the engagement of the notch 29 of the piston rod with the guide portion 22. A main body 23 of the presser roller drive device is fixed to the guide portion 22. By the operation of the loaf pressing cylinder device 16 of the drive device, the steel pipe 1 on the rotary roller 9 is pressed by the presser roller 8 and rotated, and the upper and lower arms of the rolling device are held between both rollers 8 and 9. Due to the rotation of 7b and 7a, the steel pipe 1 is immersed from the air into the water. As described above, there is a gap between the arms 36, 36' of the position adjustment device 30 and the presser roller drive device, and the presser roller drive device
It is possible to turn without interfering with 6, 36'. Note that the side of the rotating devices of the upper and lower arms 7b and 7a will be further described later. When adjusting the position of the presser roller drive device, the fixing cylinder device 26 is deenergized (unlocked), a gap is created between the concave notch 29 of the piston rod and the guide portion 22, and this causes the presser roller drive device to be adjusted. The device is now movable along the guide section 22. After this, the position adjustment device 30
The motor 35 operates, and the slider 32 moves to the feed screw 33.
The arm 36 or 36' pushes the presser roller drive device in either direction in the longitudinal direction of the tube. Although the presser roller position adjustment device 30 may be provided for each presser roller drive device arranged in the longitudinal direction of the steel pipe 1, it is generally preferable to provide it only for the necessary presser roller drive devices.

For example, as shown in Fig. 4, one of the eight steel pipe holding devices has one end (injection nozzle side No.
, No. 8), for a total of three presser roller drive devices. Next, the rotating roller will be explained in detail.

In Figure 2, the heated steel pipe 1 is attached to the jump arm 3 on the transfer line side.
(Fig. 1) shows the positional relationship of the rolling arm, the rotating roller 9, and the presser roller 8 when they roll onto a set of rotating rollers 9. In the set of rotating rollers 9, one loaf 9a located on the carry-in skid side (conveyance line side) is positioned with respect to the lower rolling arm 7a than the other roller 9b on the jumping arm 10 side.
It is strung up in a slightly higher position. That is, the line T connecting the centers of the rotating rollers 9a and 9b at the receiving position of the steel pipe 1 is
It is inclined at an angle of 8 toward the jumping arm 10 with respect to the horizontal plane. The cylinder device 16 of the presser roller 8 is aligned with this center line T.
It is installed tilted toward the device so that it is perpendicular to the By arranging the rotating rollers 9a and 9b in such a positional relationship, the steel pipe that rolls on the carry-in skid 4 from the conveyance line and is placed on a set of rotating rollers is overlined by inertia, hits the jump arm 101, and returns. When, roller 9a
, 9b are inclined toward the inside of the apparatus, so that there is no possibility that the steel pipes will jump over the rollers 9a, 9b and come back onto the carry-in skid 4. In this case, the rotating rollers 9a on the loading skid side serve as a stopper for the reversing steel pipe. Also, when the steel pipe 1 on the rotary roller 9a is pressed down by the presser roller 8 and rotated in the direction of arrow A in FIG. Therefore, steel pipe 1 becomes loaf 9 underwater.
, 8, and the position where the jump arm 10 is used underwater to transfer to the receiving arm 14 can be made deeper underwater. As a result, effective hardening can be achieved and the pressing force of the presser roller 8 in water can be reduced. It goes without saying that the above-mentioned inclination angle 81 of the rotating roller is set within a range that allows the steel pipe to be effectively supported in the air. FIG. 5 is a perspective view of the tube inner surface cooling device according to the present invention.

An arm 43 is fixed to one end of the rotating shaft 6 of the rotation device, and a water jet nozzle 40 is attached to this arm 443 so as to be coaxial with the steel pipe 1 on the steel pipe holding device. Aquarium 1
1, there is a rigid water pipe 42 coaxially with the rotating shaft 6.
is fixed to a suitable support member. This fixed water pipe 4
2 and a nozzle 40 on the arm are connected by a rigid crank tube 44 bent into an L-shape. One end 44a of the rigid crank pipe 44 is removably connected to the nozzle 40, and the other end 44a
4b is connected to the water pipe 42 via a rotary joint 45. The fixed water pipe 42 is equipped with a water pump (
A water supply hose 46 for high-pressure water led from a pipe (not shown) is connected. As mentioned above, when the steel pipe held by the steel pipe holding device performs an arcuate movement of radius L around the rotating shaft 6 of the turning device, the nozzle 40 and the Okayama body crank pipe 44 also move around the center line of the rotating shaft 6. and follows the steel pipe 1.
Since the crank pipe 44, which is a movable part, is made of a rigid steel or iron pipe instead of a flexible hose, it will not be damaged by high-pressure water and will not shake due to phenomena such as water hammer. There is no need to hang it down with extra length like with a Kason hose, and the overall structure can be extremely compact. In the present invention, the high pressure water injection nozzle 40' and the arm 43
and is detachable from the rigid crank pipe 44.

For example, the nozzle 40 and the crank pipe 44 are connected by a plug-in type connecting means. When the external dimensions of the steel pipe to be hardened change, only the nozzle 40 is replaced. In this case, as shown by the broken line in FIG. 6, when the size is changed to a steel pipe 1' with a larger inner and outer diameter and the center axis of the steel pipe moves from the position 45 to the position 46, the tip opening □40a A nozzle 40' deviated from the center of a nozzle base 40b is attached to a rigid crank pipe 44.
This allows the center of the steel pipe to match the nozzle tip without changing the nozzle support arm 43 and crank pipe 44. Furthermore, as shown in FIG. 4, the pipe inner surface cooling device of the present invention has a partition plate 4 on the water surface 18 of the water tank 11 between the high pressure water injection nozzle 40 and the steel pipe 1 on the steel pipe holding device.
1 can be provided.

The width of the partition plate 41 is such that when the high-pressure water injection nozzle 40 rotates around the rotating shaft 6 before going under the water surface, it blocks the water ejected from the nozzle and prevents the water from being ejected toward the tip of the nozzle. This is formed. When the nozzle 40 further turns and passes through the lower end 41a of the partition plate 41 and enters the water together with the steel pipe 1, the tip of the nozzle is not blocked by the partition plate 41, so that cooling water can be injected into the steel pipe 1. Become. Therefore, if the cooling water is continuously spouted from the time when the nozzle 40 rotates in the air, the inner surface of the tube can be cooled at the same time that the steel tube 1 enters the water. This arrangement, in conjunction with the structure of the rigid crank tube 44, provides a very useful cooling effect. FIG. 7 is a schematic perspective view of a steel pipe rotating device according to the present invention.

8 is a top view of the steel pipe rotation device, and FIG. 9 is a front view seen from the direction of arrow G in FIG. 7. Referring to these figures, the rotating shaft 6 of the tilting device extends from above the water tank 11 toward the outside of the water tank 11, and its shaft end is connected to the tilting arm drive mechanism of the tilting device, which will be described later. ing. A transmission gear box 54 is fixed to the rotating shaft 6 at a position outside the water tank 11. In the transmission gear box 54, as shown in FIGS. 7 and 8, a driving gear 55, two driven gears 57, 59, and intermediate gears 56, 58 between these gears are meshed with each other and supported. . Drive gear 55 is connected to rotating roller drive motor 51 by a universal joint. The shaft ends of the roller shafts 9c, gc that support the rotating rollers 9, 9 are connected to the shear gear 57 of the transmission gear box 54 via inclined connection paddles 53, 53 and universal joints 63, 63.
, 59.

In this case, each inclined connecting birch 53, 53 is inclined diagonally upward at a predetermined angle Q from the shaft end of the roller pulp 9c, gc in the tank toward the driven gears 57, 59 outside the tank. In the perspective view of FIG. 7, the upper tilting arm and the presser roller are not shown for clarity. FIG. 10 is an enlarged sectional view taken along the line X--X in FIG. 9, showing the rotation arm drive mechanism. This forehead rotation arm drive mechanism will be explained with reference to FIGS. 9 and 10. The shaft end 6a (FIG. 7) of the rotating shaft 6 of the value changing device is supported by a bearing on the pedestal 69. A swinging rod 68 projecting laterally from the rotating shaft 6 is fixed to this bearing portion. The tip of the swinging range 68 is linked to one end of the lotus rod 64. A rotating arm drive motor 65 is installed further outside the pedestal 69, and the output shaft 66 of this arm drive motor 65 is connected to a crankshaft 71 supported by another pedestal lower than the pedestal 69. ing.
The crankshaft 71 is linked to the other end of the connecting rod 64. Swinging rod 68, connecting rod 64 and crankshaft 7
1 is such that when the crankshaft 71 rotates in one direction, the swinging rod 68 swings back and forth at a predetermined angular center around the rotating shaft 6 via the connecting rod 64. Set. That is, due to the unidirectional rotational drive of the rotating arm drive motor 65, one end of the articulated birch 64 moves in a circle with a radius R around the motor shaft, and its tip touches the rotation shaft 6.
A reciprocating oscillating motion of the angular center with a radius r as the center is performed, whereby the rotating shaft 6 of the rotation device reciprocates within the range of the angular center. In other words, the frames 69 and 70, the crankshaft 71, the swinging rod 68, and the connecting member 64 constitute a crank mechanism. As is clear from the above configuration, the rotating loafs 9 and 6 are driven by the rotary roller drive motor 51 to rotate the drive shaft 50, the gear transmission mechanism in the transmission gear box 54, the inclined connecting rods 53 and 53, and the roller shaft. 9c, 9c, the connecting rod 64, the swinging rod 68,
Via the rotation shaft 6 and the tilting arm 7a, a reciprocating rotational movement is performed at an angular center around the rotation shaft 6 together with the gear box 54 and the inclined coupling shafts 53, 53. This results in loaf 9,
The steel pipe 1 on top of 9 can be immersed in a water tank while being rotated from the air. In this case, since the inclined connecting lines 53, 53 are oriented obliquely upward from the aura axes 9c, 9c, the connecting lines will not hit the upper green of the aquarium 11. A pair of rotating rollers 9, 9 are rotated together in the same direction by a gear train in a gear box 54. As described above, in the present invention, the rotary roller can be rotated and rotated around the axis of another shaft by means of the transverse motor and the transmission device provided outside the water tank. The reciprocating turning operation can be efficiently performed by the above-mentioned crank mechanism. FIG. 11 schematically shows the tilting operation of the tilting arm 7a and the rotary loaf 9. From this figure, when the rotating roller 9 rotates and turns from the air into the water, the gear box 54 that drives the rotating roller 9 does not enter the water even though it turns in the same angle range (J) as the rotating roller 9. I can clearly see that. When a steel pipe is held by rotating rollers 9 and presser rollers 8, the rotation of rotating rollers 9 causes the steel pipe 1 and presser rollers 8 to rotate due to frictional force; If the mouse lines of the rotating rollers 9 and 1 are not parallel in the horizontal plane, or if the circumferential surface of the rotating rollers 9 is even slightly bent, the steel pipe 1 will spiral in the longitudinal direction depending on the rotational direction of the rotating rollers 9. move in the same way.

When the rotating rollers rotate in only one direction, the steel pipe 1 moves in the same direction, and as a result, one tube end largely protrudes from the rotating roller and presser roller at the end, causing defects such as bending after quenching. It is quite difficult to set the axes of the steel pipe, rotating roller, and presser roller to be strictly parallel, or to form each roller with a completely identical and parallel peripheral surface. Therefore, in the present invention, it is preferable that the rotating roller 9 is repeatedly rotated forward and reverse at certain intervals. Even if the steel pipe moves in one direction during normal rotation of roller 9,
When the roller reverses, it returns in the opposite direction, and the entire steel pipe 1
The longitudinal position of falls within a certain range. According to one embodiment of the present invention, the steel pipe 1 is actively moved helically according to the rotation direction of the rotating rollers 9, thereby reciprocating the steel pipe 1 in the longitudinal direction. For example, the rotating roller 9 may be attached with a slight inclination in the same direction in a horizontal plane with respect to the roller shaft 9c.
When the roller 9 rotates in the positive direction, the steel pipe 1 moves a certain distance to the right, and when the roller 9 rotates the same amount in the opposite direction, the steel pipe 1 returns to the left (in the opposite direction) by the same distance. By repeating the forward and reverse rotation of the rollers 9, the steel pipe 1 is moved back and forth the same distance. This reciprocating movement of the steel pipe prevents the steel pipe from progressing in only one direction, and also prevents the rotary roller 9 and presser roller 8 from contacting only the same part of the steel pipe 1. However, uniform hardening is achieved. Note that after the steel pipe is immersed in water, the pressing force of the presser roller 8 under water is stronger than when it is in the air (about 100k9), and is usually about 500k9.

When the rotating roller 9 comes close to the receiving arm 14, the presser roller 8 rises to release the pressing force, and the jump arm 10 provided on the lower arm 7a operates, and the rotating roller 9
The upper steel pipe 1 is kicked out from below and delivered to the recessed part of the receiving arm 14. After passing the steel pipe 1 to the receiving arm 14, the rotating arm 6 rotates in the opposite direction, and the upper and lower forehead rotating arms 7b, 7
a returns to the original steel pipe receiving position. Then receiving arm 1
4 rotates to the position indicated by the dashed line in the figure, and as a result, the steel pipe falls onto the swash plate 21 with the eye wheel, rolls on this, and is transferred to the conveyor device 1.
It is received by the receiving hook 19 of No. 5. The receiving arm 14 returns to the upper limit position of the bunch, and the hardened steel pipe held by the conveyor device 15 is carried out from the upper end of the conveyor device 15 out of the gallery.
Note that the operation timing of each member of the device is automatically determined by timer settings or the like.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a steel pipe bonding device according to an embodiment of the present invention, Fig. 2 is an enlarged side view of a steel pipe holding device, and Fig. 3 is a view taken from arrow F in Fig. 2. 4 is a schematic front view showing the steel pipe bonding state in the steel pipe bonding device, FIG. 5 is a perspective view of the steel pipe internal cooling device, and FIG. 6 is a partial front view of the steel pipe holding device. 7 is a partial perspective view of the steel pipe rotation device, FIG. 8 is a top view of the steel pipe rotation device, and FIG. 10 is a front view viewed from the direction of arrow G.
FIG. 11, an enlarged view taken along the X-X line in the figure, is a diagram schematically showing the positional relationship between the rotating roller and its transmission gear box when the steel pipe turns. 1... Steel pipe, 2... Conveyance roller, 6... Rotating shaft,
7a...lower arm, 7b...upper arm, 8...presser loaf, 9
. . . Rotating roller, 11 . ... Presser roller drive unit body, 30...
Presser roller position adjustment device, 36... arm portion, 40...
Water injection nozzle, 41... partition plate, 50... drive shaft,
51... Rotating roller drive motor, 53... Inclined connecting rod, 54... Transmission gear box, 64... Connecting rod, 65...
...Arm drive motor, 68...Swinging camphor, 71...
crankshaft. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 8 Figure 9 Figure 5 Figure 7 Figure 10 Figure 11

Claims (1)

[Claims] 1. A steel pipe holding device that clamps and holds the steel pipe between rotating rollers and press rollers arranged in the longitudinal direction of the steel pipe, and a tilting device that turns the steel pipe held between the rollers from the air into the water tank. , an inner surface cooling device that injects water onto the inner surface of the steel pipe when the steel pipe is immersed in water, and a steel pipe rotation device that rotates the steel pipe around its axis while the steel pipe is rotating from the air to the water, The steel pipe holding device includes a presser roller drive device that is held by the tilting device and moves the presser roller up and down with respect to the rotating roller;
a presser roller position adjustment device that includes arm portions extending to both sides of the presser roller drive device and moves the presser roller drive device in the longitudinal direction of the steel pipe by pushing the arm portions;
The inner surface cooling device includes a water injection nozzle formed such that at least a tip opening thereof is concentric with the steel pipe on the steel pipe holding device, and an end portion of the steel pipe on the steel pipe holding device and the water injection nozzle. 1. A steel pipe immersion quenching apparatus comprising a partition plate provided above the water surface of a water tank between the parts.