JPH028009B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an immersion hardening device for steel pipes, and in particular, the present invention relates to an immersion hardening apparatus for steel pipes. The present invention relates to a multiple immersion quenching device that can uniformly and efficiently quench internal and external surfaces.

(Prior Art) In order to make steel pipes high in tension and toughness, quenching and tempering treatments are performed in the same way as other steel products.
As a method for quenching steel pipes, it is known that the inner and outer surfaces of a heated steel pipe are cooled and quenched by water cooling. As a conventional quenching device of this type,
As shown in figures a and b, roll 1 of pipe 1 in the air.
1, the inner cooling nozzle 21
is placed at one end of the pipe 1, and a laminar water head 23 extending over the entire length of the pipe is installed above the pipe, so that while the heating pipe 1 is rotated, the inner and outer surfaces are simultaneously cooled by jets of cooling water on the inner surface and lamination flow on the outer surface. Alternatively, as shown in FIG.
Attach the pipe rotation drive roll 5 to the tip of 4,
An immersion quenching apparatus is known in which the heating pipe 1 is supported and rotated in the air by the rolls 5, the arm 24 is rotated into the water tank 6, and the pipe 1 is immersed in water for cooling. Although not shown otherwise,
There is a device in which a pipe is held and clamped around the circumference of a rotating drum at the top of a water tank, and the pipe is continuously immersed in the water tank as the drum rotates.

(Problems to be Solved by the Invention) Of the conventional steel pipe quenching apparatuses described above, FIG.
The air-water cooling type quenching equipment shown in b transports each pipe one by one to the position below the laminar flow water head 23, so it usually takes about 20 to It takes 40 seconds, so it cannot be used in pipe manufacturing lines with shorter time cycles. In addition, in the rotary arm type immersion hardening device shown in FIG. 5, the pipes 1 are held one by one by the arm 24, and the next pipe must be transferred to another conveying device after hardening of this one pipe is completed. It is not possible to hold the pipe in the arm, and it is also impossible to follow the manufacturing process with a short time cycle. If the heated pipes are kept waiting in front of the quenching equipment as they are brought in one after another, high-quality products cannot be obtained, resulting in a decrease in pipe manufacturing efficiency and productivity as a whole. The type in which the pipe is fixed to the final rotating drum and immersed in water has the disadvantage that the pipe cannot be rotated around its axis during hardening, resulting in uneven heating, warping, and bending.

(Means for Solving the Problems) The present invention eliminates the above-mentioned conventional problems and makes it possible to continuously harden pipes that have been manufactured in a short time cycle uniformly and efficiently on the inside and outside surfaces. The object of the present invention is to provide a continuous type immersion quenching apparatus, which includes a star-shaped wheel rotatably arranged above a water tank and having a plurality of arms extending in the radial direction, and each of the star-shaped wheels. A pipe rotation driving roll and an openable/closable pipe holding roll held at the tip of an overhanging arm, a conveyor device that receives the pipe discharged from the star-shaped wheel in the water tank and carries it out outside the water tank, and It has a drive device for a pipe rotation drive roll and an opening/closing drive device for a pipe presser roll, and the star-shaped wheel is configured to cause the extending arm to reciprocate between the air and the water by its rotating action. This is what I did.

(Example) Next, the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a multiple immersion quenching apparatus according to an embodiment of the present invention. A rotating shaft 7 is pivotally supported above the water surface of the water tank 6, and is driven to reciprocate within a predetermined range by an appropriate drive source (not shown) outside the tank. A plurality of star-shaped wheels 8 are fixed to the rotating shaft 7 at appropriate intervals along its axial direction. The star-shaped wheel 8 has a plurality of projecting arms 9 projecting radially. In the illustrated embodiment, four projecting arms 9 extend radially at equal intervals.
Moreover, each extending arm 9 fixed to the rotating shaft 7
are positioned such that their angular positions are equal to each other. A pair of pipe rotation drive rolls 10 are pivotally supported at the tips of each of the overhang arms 9 of the star-shaped wheel 8, and a rotation drive source (not shown) is installed at an appropriate position on the wheel 8, for example, at the base of the overhang arm 9. (omitted) are rotated in the same direction via chains, gears, etc. The pair of pipe rotation drive rolls 1
A spacing of 0 means that the pipe 1 is supported between both rolls 10, and that the rotation of the rolls 10 effectively prevents the pipe 1 from moving between the rolls 10.
The interval is determined such that the information can be transmitted to Also,
A power supply line or the like is connected to the rotational drive source of the roll 10 from outside the tank. Of course, this rotational drive source is set at a position where it will not be immersed in the water of the aquarium due to the rotation of the star-shaped wheel 8. A pipe holding arm 12 is pivotally attached to the tip of each of the projecting arms 9 so that the tip side can be opened and closed. At the tip of the pipe holding arm 12, a pair of pipe holding rolls 13 are rotatably supported opposite to the roll 10. The pipe holding arm 12 is opened and closed (pipe release, pipe holding) by a cylinder device 14 whose one end is attached to the arm base and the other end is attached to the extending arm side. Like the pipe rotation drive roll 10, the cylinder device 14 is also connected to a hydraulic power source outside the tank via a hose.
Therefore, by opening and closing the pipe holding arm 12, the pipe is held between the pair of pipe driving rolls 10 and the pipe holding roll 13, and by driving the pipe rotation driving roll 10,
The pipe rotates while being held between rolls 10 and 13. Further, a nozzle for cooling the inner surface of the pipe is provided concentrically with the pipe 1 sandwiched between the pipe rotation driving roll 10 and the pipe holding roll 13, as required, on each star-shaped wheel 8 or outside the tank. In this embodiment, nozzles for cooling the inner surface of the pipe are not shown, but if they are installed outside the tank, a plurality of nozzles should be provided so as to correspond to the extending arm 9 of the star-shaped wheel 8, and moreover, in synchronization with the rotation of the wheel 8. It is connected to the rotating shaft 7.

A conveyor 15 for discharging the quenched pipe is installed extending from the inside of the water tank 6 to the outside of the water tank. An underwater skid 16 is placed between the extending arm 9 of the star-shaped wheel 8 that has rotated to a predetermined position underwater and the unloading conveyor 15.
is installed, and at this predetermined position, the pipe holding arm 1
2, the pipe is released from the pipe rotation drive roll 10 and presser roll 13 and falls onto the underwater skid 16, transferred to the delivery conveyor 15, and transported out of the tank. Hereinafter, this operation will be explained step by step with reference to FIG. 1 and FIGS. 2 a to i.

First, the first heat-treated pipe 1 is carried onto the rolls 10 provided on the No. 1 extending arm 9 of the star-shaped wheel 8, and is clamped by the pipe presser rolls 13, and at the same time, the pipe starts rotating. This state is the state shown in FIG. 2a. From here, the star-shaped wheel 8 rotates 1/8 in the normal rotation direction, and when the pipe 1 comes to the position 1a as shown in Figure 2b, it receives a signal announcing the next pipe delivery and continues rotating the pipe until it reaches the position 1a.
The second pipe 2 is held by the No. 2 extension arm as shown in Fig. 2c, and the pipe is held and rotated by the star-shaped wheel as shown in Fig. 2d. 8 rotates and pipe 2 moves to position 1a
, pipe 1 comes to position 1c. In response to a signal announcing the delivery of the third pipe 3, the rotation of the pipe 1 of the No. 1 extension arm 9 is stopped at position 1c and the grip is released, and the first pipe 1 is transferred from the underwater skid 16 onto the delivery conveyor 15. Moved third pipe 3
is carried in (Fig. 2 e), the pipe 2 is released at the position shown in Fig. 2 f, and in the state shown in Fig. 2 g after an additional 1/8 turn, the fourth pipe 4 is moved to the No. 4 extending arm. is maintained. After this fourth pipe 4 is held by the No. 4 extension arm at the carry-in position, the star-shaped wheel 8 rotates 7/8 in the reverse direction from this position as shown in Fig. 2h, and here the third pipe The wheel 8 rotates 1/8 in the normal rotation direction to accept the next pipe 1' as shown in Fig. 2i in response to a signal announcing the next pipe delivery, and the rotation of the wheel brings it into the state shown in Fig. 2b. Release the fourth pipe and repeat the same operation. During continuous operation, that is, after FIG. 2h, the star-shaped wheel 8 repeats one forward rotation and 7/8 rotations in the reverse direction.

FIG. 3 is a side sectional view showing another embodiment of the present invention. In this embodiment, as in FIG.
radially, but the difference is in the tank 6.
A guide portion 17 having an arc-shaped guide surface 17a is installed at the bottom of the wheel, and a guide roll 18 is provided at the tip of each projecting arm 9 of the star-shaped wheel 8. The star-shaped wheel 8 rotates stably because the guide roll 18 rolls on the guide surface 17a when the wheel rotates, and the rigidity of the rotating shaft 7 or the extending arm can be reduced accordingly. becomes more compact as a whole.

(Effects of the Invention) As explained above, the multiple quenching apparatus of the present invention enables uniform and stable immersion quenching in a short cycle, and improves quality without reducing the production efficiency of existing pipe manufacturing equipment. It will be planned. For example, in the four-barrel quenching apparatus of the above embodiment, the cycle time is 16 seconds, the pipe rotation quenching time is 20 seconds, and the total immersion time is 45 seconds. Furthermore, the present invention has the effect that the pipe holding mechanism and rotational drive mechanism can be installed on the arm, thereby making it possible to achieve compactness.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a four-bar immersion hardening apparatus according to an embodiment of the present invention, FIGS. 2 a to i are diagrams showing the operating state of the embodiment of FIG. 1, and FIG. A side sectional view of another embodiment of the invention, FIGS. 4a and 4b are a side view and a front view of a conventional air-water cooling type quenching apparatus, and FIG. 5 is a schematic side view showing a conventional example of an immersion quenching apparatus. FIG. 1, 2, 3, 4...pipe, 6...water tank, 7...
... Rotating shaft, 8 ... Star-shaped wheel, 9 ... Overhanging arm, 10 ... Pipe rotation drive roll, 12 ... Pipe presser arm, 13 ... Pipe presser roll, 1
4... Cylinder device, 15... Unloading conveyor, 1
6... Underwater skid.

Claims (1)

[Claims] 1. A star-shaped wheel rotatably arranged above the aquarium and having a plurality of radially extending arms;
A pair of pipe rotation drive rolls held at the tip of each overhanging arm of the star-shaped wheel and a pipe holding arm pivotally connected to the tip of each overhang arm so as to be openable and closable are provided opposite to the rotation drive roll. a pair of pipe holding rolls, a conveyor device that receives the pipe discharged from the star-shaped wheel in the water tank and carries it out of the water tank, a drive device for the pipe rotation drive roll mounted on the star-shaped wheel, and a pipe holding roll. 1. A multiple immersion quenching apparatus, characterized in that the star-shaped wheel has an opening/closing drive device, and the overhanging arm reciprocates between air and water by the rotating operation of the star-shaped wheel.