JPS5816711A - Inclined rolling mill for steel pipe - Google Patents

Abstract

PURPOSE:To prevent flaring in the trailing end part of steel pipes and the fluctuations in their wall thickness by providing roll screw-down mechanisms to the stationary housing and rotary housing of a rolling mill in the positions facing the respective rolls, and operating the rotation mechanism of the rolls and the screw-down mechanisms synchronously. CONSTITUTION:In the state of starting the rolling work, rolls are set at prescribed angles of inclination and roll clearances, and the steel plate charged between the rolls is rolled to prescribed sizes. When the end part of the pipe arrives at the prescribed position, motors 7, 80 are operated under preset conditions and rotate a rotary housing 3, thereby rotating rolls 4a-c and changing the angle theta of inclination to theta1(theta>theta1). At the same time, screw-down mechanisms 8a-c are operated to screw down the rolls 4a-c, thereby correcting the clearances of the rolls 4a-c which are widened by the rotation. Upon ending of the rolling in the trailing end part, the rolls 4a-c are returned to the initially set states.

Description

[Detailed Description of the Invention] The present invention company, the steel pipe slanting machine, more specifically the company 3-sole.
Regarding the steel pipe rolling machine that prevents the flare and wall thickness variation that occurs at the rear end of the rolled steel pipe by 1 mK at the Axel Mill.
It is.

3W-Le Axel Mill Co., Ltd., as is well known, is equipped with three rolls rotating in the same direction at 120° intervals in the shaft, and the shaft of each roll is connected to the rolled steel pipe (hereinafter referred to as steel pipe). The reel is arranged at an angle of 10 to 15 inches with respect to the pass line of the steel pipe. This is the first part that undergoes rolling.

When a thin-walled steel pipe is rolled using a 3g-le accelerator mill such as Ren, a triangular section (hereinafter referred to as an area) is generated at the rear end of the steel pipe. To prevent this, conventionally when rolling the rear end of a steel pipe.

The feed angle is lowered by rapidly rotating the rotating housing. In other words, the slope of the steel pipe relative to the pass line of the steel pipe is made smaller to prevent the occurrence of flaring, but this widens the gap between the pipes and increases the weight. The disadvantage is that the rear end is thick.

In order to solve the above-mentioned conventional drawbacks, the present invention company'
&? J-shaped to the fixed housing and rotation of the rolling mill ☆
Jinda O Each W-71/K is provided with a roll-down mechanism at a corresponding position, and the steel pipe rear end 07 is operated in synchronization with the roll-down mechanism of the roll. It is an object of the present invention to provide a rolling mill that prevents occurrence of rare and wall thickness fluctuation. The present invention will be explained below with reference to the drawings.

Figure 1 is a side view of an embodiment of the present invention shown in partial cross section;
FIG. 2 is a front view of the same. In FIG. 2, numeral 1 is a housing body, and a fixed housing 2 is mounted on the upper part. 3
A rotary housing is rotatably supported by the fixed housing 2Wc via a bearing, and 31 is a gear provided on all or a part of the outer periphery of the rotary housing. 41% 4 b, 4 cd
Vx-A/ is held on the tardle 6a s 6 b s 6 c via chucks 5m, 5b, 5c, and steel pipe pass lines P- are placed in both housings at 120' intervals. They are installed at an angle of - with respect to the PK.

The motor is fixed to the fixed housing 2, and its output gear 71 is connected to the rotating housing 3 via the intermediate gear.
By rotating the motor 7, the rotary housing 3 is rotated along the inner shoulder of the fixed housing 2, and the rotation housing 3 is rotated along the inner shoulder of the fixed housing 2. The mounting angle can be changed.

8as 8bz 8c and 9hata are each 1m-4451~
4cK is a subordinate mechanism provided in the fixed housing 2 and the rotating housing 5 (note that only 9a is shown as the lowering mechanism of the rotating housing 3). Each of these lowering mechanisms 8a
~8c, 9aO configuration is Pi! Since they are the same, the lowering mechanism 8a will be explained below.

80 is a motor, 81 is a worm driven by the motor 80, and a bevel gear 82 is attached to the other end C. This is a worm gear that meshes with a worm 81 manufactured by 83 Co., Ltd., and is fixed to a shaft 84, and this shaft 84 is connected to a Ji male thread 85. A male screw 85 is screwed with an 86 Korean female screw, and is slidably disposed in a hole provided in the fixed housing 2. 8
Reference numeral 7 designates a lowering shaft with a catch 88 that contacts the chisel 5aK at the tip, and the other end contacts the female thread 86), and when the male thread 85 is rotated via the gear 83, the female thread is screwed into the male thread 85. 86 #i is displaced up and down, and the reduction shaft 87 in contact with it is moved up and down. 82 m is a bevel gear that meshes with the bevel gear 82 . The lowering mechanism 8 b s 8 c also has the lowering mechanism 81 and P
Although it has the same configuration, the lowering mechanism 8C has bevel gears on both sides of the worm gear, and the lowering mechanism 8C has a bevel gear on the worm gear side.

Reference numeral 89-189b is a par connecting the respective lowering mechanisms 8a to 8c. In addition, each of the lowering mechanisms 9 of the rotary housing 3 is heated. Bevel gear 82.82m, par 8
9m, the bevel gear of the lowering mechanism 8b, the worm, the bevel gear, the par 89b and the lowering mechanism 8c rotate the worm through the bevel gear, and each worm 81 has a worm gear 85,
The lowering shaft 87 is displaced upward or downward via the male screw 85 and female screw 86. The operation of the rolling mill of the present invention constructed as described above will be explained as follows.・When the tatami press work started,
Wax W-ru inclination angle and predetermined O*-ru clearance Kfl
The steel pipe inserted between the rolls is rolled to a predetermined size.

A tube end passage detector installed at a predetermined position on the entrance side of the rolling mill activates a timer when the tube end passes.

Mo#7 and Mo#8 based on preset conditions.
0 and rotate the rotary housing 3 to rotate each field 4.
Power the stomach of 4C, change the angle of inclination of the wall to #IK (in this case, θ>-θ), and operate the lowering mechanisms 8a to 8C and 9m to lower the stomach. 4a-4
vs-s that compresses C and expands due to rotation
Correct the interval between t4 Hatake and 4e. This makes it possible to completely prevent flaring and wall thickness fluctuations that occur at the rear end of the steel pipe.

When the rolling of the rear end portion is completed, the wheels 4a to 4-c are returned to their initial settings again. □.

Further, the present invention may also be operated as follows. That is, when the passage of a pipe end is detected by the pipe end passage detector, the pull tilting mechanism and the rolling down mechanism are operated to prevent flare and wall thickness fluctuations, and to prevent flare and wall thickness variation. When the process is completed, the predetermined initial roll inclination angle and roll clearance are returned.
Furthermore, a timer τ is activated at the same time as rolling starts, and various conditions are set in advance on an electronic computer, etc., and the rolling inclination angle change mechanism and rolling down mechanism are activated after a certain period of time has passed from the start of rolling. After the rolling operation is completed, the rolling axis may be returned to a predetermined on-roll axis oblique angle and round clearance.

In the above description, the configuration and operation of one embodiment of the present invention have been described, but the present invention is not limited to this.
Needless to say, the purpose can also be achieved by a mechanism with similar functions.

As detailed above, according to the present invention, the roll sheeting mechanism and the rolling mechanism are operated in synchronization.
Since flaring and wall thickness fluctuations occurring near the rear end of the steel pipe can be prevented, a steel pipe with accurate shape and dimensions over the entire length can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, partially shown in cross section, and Fig. 2 is a front view thereof. 1S eight hejinda main body, 28 fixed housing, five rotating eight housings 4m, 4b, 4c: 0-/k, 7! Field
Mo# % 8 m, a bsBC % for tissue binding
9a! Lowering mechanism, 808 O motor for lowering mechanism. Agent Patent Attorney Tadashi Sato Figure 1 S2 Figure n

Claims (1)

[Claims] A rotary housing is attached to a fixed housing provided on the housing body, rolls are arranged at equal intervals in the test vehicle, and a four-wheel mechanism for rotating the rotary housing is provided, and the above-mentioned - 8'/V/f
/ F-1! II IC""-""Karurushi-(ten
1. A one-tube diagonal rolling mill, characterized in that a rolling roll reduction mechanism is provided, and the rolling mechanism and the roll rolling mechanism are operated synchronously near the rear end of a steel pipe to be rolled.