JPS5956524A - Immersion hardening device of steel pipe - Google Patents

Abstract

PURPOSE:To prevent the damage, bend, etc. on the outside surface of a steel pipe by immersing the steel pipe which is sandwiched with rolls from above and below while rotating the same thereby enabling uniform hardening. CONSTITUTION:A titled device consists of a tilting arm 7, an easy down arm 16, a kick-out arm and an ejector 15 which ejects a steel pipe 1 rolled to the lowermost position of an underwater skid 14 to the outside of a water tank 11. Said arm 7 supports pivotally a revolving roll 9 and a retaining arm 17 and turns from the space into the water. The arm 16 turns to place the steel pipe 1 rolling downward along a feed skid 4 on the roll 9 while supporting the same from below. The above-described kick-out arm kicks the steel pipe supported pivotally by the arm 7 onto the skid 14 in the water. The steel pipe 1 is rotated and immersed in the water while the steel pipe is held between the roll 9 and a press roll 8 by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel pipe 1!1tffr quenching apparatus that uniformly quenches the inner and outer surfaces of a steel pipe heated to a predetermined temperature by immersing the same in a water tank while rotating it.

One of the methods to make steel pipes high in tension and toughness is to undergo treatments such as quenching and tempering, just as with other steel products. BACKGROUND ART Conventionally, as a method of quenching steel pipes, a method of quenching a heated steel pipe by immersing it in water has been known. In this case, N
If the 'l 9 were simply dropped from the air into the water, the steel pipe would hit the bottom of the tank or the support in the tank, causing damage to the outside surface of the steel pipe. Also, if the steel pipe is immersed in the water tank from above,
The lower side of the steel pipe cools first, causing uneven heating and bending.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide an immersion hardening apparatus that can uniformly harden steel pipes and does not cause damage or bending on the outer surface of the steel pipes.

The steel pipe immersion hardening apparatus according to the present invention includes a tilting arm that pivotally supports the rotary opening and the presser arm and pivots from the air into the water, and a steel pipe that rolls and falls along the loading skid. The steel-a of the rotating roller L is jumped to the underwater skid 1 in the water by the slide down arm which moves simultaneously so as to gradually place it on the rotating roller while supporting it from above, and by the tilting arm. The lowest point of the submersible skid mentioned in III is also equipped with a carry-out device for carrying out the steel pipe that has been rolling randomly out of the water tank, and the steel pipe is moved in the air between the rotating roller and the holding roller. In this state, the tilting arm rotates to immerse it in water.

Embodiments of the present invention will be described below with reference to the drawings.

The meat surface shows the IH cost of the steel pipe immersion quenching apparatus according to the embodiment of the present invention.
! Next to [IJi song diagram. Note that this figure is a cut perpendicular to the longitudinal direction of the heated steel pipe brought in for hardening. The heated steel pipe 1 is conveyed by V-shaped conveyance rollers 2 along a conveyance line in the longitudinal direction (direction perpendicular to the plane of the drawing) and is stopped at the side of the immersion hardening apparatus. A jump-out arm 3 is pivotally supported on a device pedestal 12 in proximity to the conveyance roller 2, and a loading skid 4 is provided on the pedestal 12 in the h direction so as to be slightly lowered toward the inside of the device. ing. The inside part of the loading skid 4 is bent diagonally downward from a generally horizontal part 4a with a gentle slope, and the end thereof is bent diagonally downward with a steeper slope.
It extends close to the surface of the water.

A rotating shaft 6 is pivotally supported on the pedestal 12, and a tilting arm 7 is attached to the rotating shaft 6. Inclination +1j)) A set of rotating rollers 9 is pivotally supported at the tip of the arm 7. A presser arm 17 and a jump arm 10 are pivotally supported approximately at an intermediate position between the base and the tip of the tilting arm 7.

A set of presser rollers 8 is rotatably supported at the tip ψ;M of the presser arm 17. A plurality of tilting arms 7 are provided at regular intervals in the longitudinal direction of the steel u1. Note that the rotating rollers 9 of each tilting arm 2 are rotated by a drive device (not shown) via a roller shaft 9a connecting the rollers, and the presser arm 17 and the jumping arm IO are also each provided with a separate cylinder device. (not shown). The tilting arm 7 is reciprocated by a drive device (not shown) connected to its rotating shaft 6 from the solid line position in the figure to the broken line A position.

Easy-down arm 1 is attached to another frame 5 above the water tank 11.
6 is pivotally supported. The easy-down arm 16 extends from the base of the curved portion 4b (L-shape of the large skid 4) to near its tip, that is, close to the rotating roller 9, and is connected to an appropriate drive device (not shown). Therefore, it is designed to rotate back and forth between these areas.

When the heated steel tube 1 supported on the conveyor o-'') 2 is conveyed to the (li11 side) of the quenching device, the steel
jumps out, arm; jumps out onto 1 installation skid 4 by arm; 3, horizontally #11, rolls 1a, I: +jllL
riH minute 4 b] of the loading skid 4! E(. At this time, the easy down arm 16 extends to the base position of the bent portion, and thereby the bent gt5
The lower blade supports the copper pipe l, which is about to fall. Thereafter, the easy-down arm 16 slowly rotates toward the rotating roller 9, whereby the steel pipe 1 on the arm 16 is moved along the bent portion 4b while being supported by the arm 16.
．． ” and is placed on the rotating arm 9L of the − group. At this point, the presser arm 17 is at the solid line b': or1) A1! Q A+! It turns to i+7i ii'r and presses =Ihl 'i11 against the rotating roller 9 by the presser roller 8 at its tip.

The rotation of the rotary roller 9 causes the steel pipe 1 to rotate, and in this state, the tilting arm 7 pivots toward the water tank 11, and the steel pipe 1
While holding it, it comes to the underwater dotted line in the aquarium and stops.

At the same time that the steel pipe l is immersed in water, cooling water is injected from high-pressure water injection nozzles (not shown) arranged concentrically near one end of the steel pipe.1. Ru. Note that the high pressure water injection nozzle is 0.
l +
The rotation of the rotating shaft 6 creates a concentric shape f with the steel pipe 1.
Rotation axis 6 while keeping n, 4? It revolves in the water as the center. An external injection header 13 is arranged in the water tank 1, and high-pressure water is injected from the rudder 13 onto the external surface of the pipe 311 underwater, thereby stirring the water. Perform cooling. In addition, easy down arm 1
6, the steel pipe 1 is rotated by a small roller 9. L, l two sounds 1η,
When the rotating roller 9 is submerged in water, it returns to its original position, that is, the base position of the bent portion 4b of the carrying skid 4.

In the water tank 11, an underwater skid 14 is provided near the rotating roller 9 located at the dotted line A11 in the water. A stopper 14a is provided at the bottom of the underwater skid 14. The tilting arm 7 rotates underwater at the dotted line position, and when a certain period of time A''6 has passed, it rises to a position near the submerged Sugirad 14 at the dotted line position 13 and temporarily stops +l, L, presser arm 17 rotates toward 1. in the direction away from 41.4a1 on the rotating roller 9, releasing the push of the nucleus, ・1.i'iRi.This ridge is pivotally supported by the tilting arm 7. The jump arm 10 is actuated and on the rotating roller 9; ii
i W 1 is kicked out from below and placed on the underwater skid 14. The steel officer 1, which rolled on the underwater skid 14 and came to a stop when it hit the stop flange 14a at the lower part of the skid 14, is discharged out of the water 11 by a discharging device 15, which will be described later. After the tilting arm 7 kicks out the steel pipe 1 onto the underwater skid 14, it returns to its original position by reverse rotation of the rotating shaft 6.

The unloading device 15 has a plurality of claws 19 each having a V-shape on one side attached to the outer periphery of a rotary drum 1, 20', and when the drum 2 () rotates, the four parts of the claws 19 are attached to the bottom of the underwater skid 14. Scoop up the steel pipe 1 and discharge it to the water tank Hijikata's carry-out skid 2.

According to the present invention, a steel pipe is dipped from the air into water in a rotary manner while being held at multiple points in the longitudinal direction with rollers from above and below, and at the same time as this immersion, a portion of water is applied to the inner surface of the pipe.
1) Uniform quenching is achieved by spraying coolant water. In conventional equipment of this kind, the center of the steel pipe inserted into the water tank and
There was a problem that it was difficult and time-consuming to adjust the position of the cooling cooling nozzle in the t-hole, but in the present invention, it was a rotating model with a 1 [ro-ro-f- By connecting the inner cooling nozzle to the rotation axis of the rotary arm, the nozzle can be rotated from the air to the water together with the shafts 1' and f, making it possible to achieve very accurate center alignment. It is easy.The steel pipe supplied from the skid is placed on the rotating roller L so as to be supported from the top, and then slowly put into the water, so there is no damage to the surface due to the steel pipe falling, unlike in the conventional method. Problems such as sticking do not occur.It is easy to adjust the pressing force of the presser arm. For example, when the steel pipe is heated in the air, it is lightly pressed, and when it is quenched in water, it is pressed lightly. The holding pressure of the steel pipe can be increased, and from this point of view, the steel pipe will not be damaged or bent.In addition, the holding pressure of the steel pipe (
14.Underwater/Uke is passing +i +by, underwater power) et al (
Since the transport to Sogai was completely constructed with a rotating mechanism,
The operation of each part becomes smooth, and the process from loading the steel pipe to unloading can be performed automatically by a timer (+ll).

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of a steel pipe immersion hardening apparatus according to an embodiment of the present invention. ■...-, i4 tube, 3.10... jump arm,
4. Loading skid, 5.12... Frame. 6...Rotating shaft, 7...Tilt arm, 8...Press roller, 9...Turning roller, 11...Water tank, 14...
... Underwater skid, 15... Carrying out device, 16... Easy down arm, 17... Tilt arm, 21 - Skid for J stage. Attorney: Toshikichi Somekawa

Claims (1)

[Claims] A single-tilt arm rotates from the air into the water by supporting a rotating roller and a presser arm, and a rotating arm that supports the steel pipes transferred and falling along the loading skid from below and gradually places them on the rotating rollers. Rotating easy down a-
a jump-out arm that is pivotally supported by the tilting arm and jumps out the steel pipe on the rotating roller underwater onto an underwater skid;
and a carrying-out device for carrying out the steel pipe that has rolled to the lowest position of the underwater skid out of the water tank, and rotating the steel pipe in the air while holding it between the rotating roller and the pressing roller,
A steel pipe immersion hardening apparatus characterized in that the steel pipe is immersed in water in this state by rotating the tilting arm.