JPH0139844B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an entrance table device of a tube rolling equipment that performs a semi-float process, that is, a mandrel inserted into a metal tube before rolling is locked and its movement is controlled. Regarding an entrance table device for a pipe rolling equipment, which causes a metal tube to be rolled in a mandrel mill and releases the locking of the mandrel after rolling, more specifically, the device releases the locking of the mandrel. We propose an entrance table device for pipe rolling equipment that is configured to be able to perform rolling immediately after the completion of rolling, thereby shortening the rolling cycle, and also allowing the mandrel to be detached from the metal pipe after rolling in the next step without any inconvenience. It is something.

[Prior art]

The semi-float method is one of the mandrel mill methods in which seamless steel pipes are manufactured by passing a hollow tube inserted through a mandrel through a mandrel mill. In this semi-float method, a hollow tube with a mandrel inserted through it is placed on an inlet table device placed on the upstream side of the mandrel mill in the rolling direction, and the upstream end of the mandrel is engaged with the inlet table device. While controlling the movement, the hollow tube is fed to the mandrel mill and rolled. After the rolling is completed, the mandrel is released, and then the stripping device installed downstream of the mandrel mill is used to roll the tube. This is a rolling method in which the mandrel is separated from the seamless steel pipe fed to the steel pipe.

As an entrance table device used for such rolling, the one shown in FIG. 7 is known. Figure 7 shows a rolling mode in which this device is used to minimize the mandrel insertion length (rolling in which the insertion length of the mandrel MB, which is still inserted into the upstream end of the seamless steel pipe SP at the end of rolling, is as short as possible). FIG.

The chains 13 are placed on a mounting table (not shown) that is movable together with the endless chains 13 (only one side is shown in the drawing), which are placed opposite each other and move around in a cooperative manner. Hollow tube with mandrel MB inserted from the direction
The upstream end MB ₁ of the mandrel MB, which has a small diameter, is placed inside the U-shaped round groove of the mandrel locking tool 14, which receives the HS and is movable integrally with the chain 13. Chain 13
By the circular movement of the hollow tube HS, the mandrel mill 11 engages the hollow tube HS to perform rolling, and during this period, the movement of the mandrel MB is controlled. Then, when the mandrel locking tool 14 reaches the mandrel locking release position, the locking of the mandrel MB is released.

After rolling, the steel pipe SP and mandrel MB are transported downstream by the exit-side transport rollers 12, and the mandrel MB is removed from the steel pipe by a stripping device (not shown).
Will be removed from SP. Further, the locking tool 14 is moved in the opposite direction at a speed faster than the moving speed during rolling,
Prepare for the next rolling.

[Problem that the invention seeks to solve]

By the way, in the conventional device as described above, the position where the mandrel MB is released is chain 1.
Since the distance was constant at the end of the moving range of No. 3, the following problems occurred.

That is, when the hollow shell HS is inserted into the mandrel mill 11, the downstream end of the mandrel MB is made to protrude by a fixed length beyond that of the hollow shell HS, regardless of the length of the hollow shell HS. Therefore, when rolling hollow shell tubes HS of different lengths, it is necessary to
The higher the HS, the faster the rolling ends. Then, since the unlocking position of the mandrel MB shown in FIG. Mandrel locking tool 14 at the end of rolling shown in Figure 7 D
The distance L between the position and the mandrel lock release position increases. After rolling, the mandrel MB will be transported by this distance L in a locked state, but since the mandrel MB is inserted into the steel pipe SP during this time, the conveyance speed of the exit roller 12 will not match. Due to this, it will be transported at low speed. Therefore,
The shorter the length of the hollow tube HS, the more time it takes for this transfer.
When rolling HS, the rolling cycle becomes longer,
It is not possible to efficiently manufacture seamless steel pipe SP.

Also, during the transfer, the steel pipe SP is connected to the chain 13.
Since the steel pipe SP is transported at a transport speed of the exit transport roller 12 that is faster than the rotational speed of the steel pipe SP, a speed deviation occurs between the transport speed of the mandrel MB and the inner surface of the steel pipe SP. .

The above-mentioned disadvantages occur not only in the minimum mandrel insertion length rolling mode, but also when executing the constant mandrel insertion length rolling mode in which the insertion length into the hollow shell HS is kept approximately constant from the start of rolling to the end of rolling. be.

[Means for solving problems]

The present invention was developed in view of the above circumstances, and is provided so as to be able to move integrally with the endless chains that are disposed opposite each other and are moved around in a cooperative manner in the rolling direction. It guides the movement of the mandrel locking tool that locks the upstream end of the mandrel inserted into the blank pipe with the top open, and also allows the mandrel locking tool, which is inserted into the blank pipe, to lock the upstream end of the mandrel to the downstream side using the inclined surface provided at the downstream end. To solve the above-mentioned inconvenience by making it possible to adjust the position of a rail in the circumferential motion range of the chain, which is tilted to release the lock of the mandrel mill, and to release the lock of the mandrel immediately after rolling is completed. With the goal.

The inlet table device for a tube rolling equipment according to the present invention receives a hollow blank tube with a mandrel inserted between the endless chains that are arranged oppositely and move around in a cooperative manner, and also receives the hollow blank tube with a mandrel inserted therein. The side ends are locked and the hollow tube is engaged with a mandrel mill provided on the downstream side to perform rolling while controlling its movement, and the locking of the mandrel is released after rolling is completed. In an entrance table device for a pipe rolling equipment, a mandrel locking device is provided between the chains so as to be movable together therewith, and locks the upstream end of the mandrel with the top surface open;
The chain includes an inclined surface that guides the movement of the mandrel locking device, and has an inclined surface at the downstream end of the mandrel locking device to tilt the mandrel locking device downstream and release the locking of the mandrel. The present invention is characterized in that it comprises a rail that is movable in the circumferential direction, and is configured such that the locking of the mandrel can be released at any time after the completion of rolling of the hollow tube.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a partially cutaway schematic front sectional view of a tube rolling facility to which an inlet table device for a tube rolling facility according to the present invention is applied, and FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1.

The device 2 of the present invention is provided on the upstream side of the mandrel mill 1 in the rolling direction indicated by the white arrow in the figure. The device 2 of the present invention has two endless chains 3, 3 which are disposed oppositely and are moved around in the rolling direction, and a space between the two chains 3, 3 that can be moved integrally with the chains 3, 3 at symmetrical positions in the circumferential direction of the chains 3, 3. A pair of mandrel locking tools 4 straddled, a rail 5 that guides the movement of the mandrel locking tool 4 in the rolling direction, and a drive device 6 that drives and stops the rail 5 at a predetermined position in the rolling direction. As shown in Fig. 2, the chain 3, 3 is fed horizontally on the entrance table 8, which is installed at a position that does not interfere with the movement of the chains 3, 3 in the opposite direction. , the hollow tube HS with the mandrel MB inserted is loaded between chains 3 and 3,
Further, the upstream end of the mandrel MB is locked with the mandrel locking tool 4, and while controlling its movement, the chains 3 and 3 are moved around the hollow tube HS.
should be able to be fed to the mandrel mill 1 and rolled by the semi-float method.

The configuration of each part of the device 2 of the present invention will be explained in detail below. On the upstream side of the mandrel mill 1 in the rolling direction, a pair of frames 21, 21 are arranged side by side in the rolling direction (see FIGS. 4 and 6).
A pair of drive sprockets 31 are provided at the upstream end of 21.
, and a pair of driven sprockets 3 at the downstream end.
2 (in the drawing, only one on the rear side in front view appears as shown in FIG. 1) is attached. Endless chains 3, 3 are wound between the driving sprocket 31 and the driven sprocket 32, respectively. A plurality of mounting tables 33 are provided between the chains 3, 3 at equal intervals in the circumferential direction thereof. A circular groove (not shown) is formed in the center of the mounting table 33 in the direction in which the chains 3, 3 are disposed, and the hollow tube HS with the mandrel MB inserted therein is received in this circular groove.

Next, the mandrel locking tool 4 will be explained based on FIGS. 2 and 3. Two mandrel locking devices 4 are provided at symmetrical positions in the circumferential direction of the chains 3, 3, and when the hollow tube HS is placed on the above-mentioned mounting table 33, as shown in FIG. One of the rails is controlled so that it is positioned on rectangular plate-shaped fixed rails 35, 35 (see FIG. 2) provided near the exit side of the drive sprocket 31. FIG. 3 is a perspective view showing the mandrel locking tool 4 in this position and locking the rear end of the mandrel MB.

Special chain link pieces 34, 34 are connected to the chains 3, 3 at the positions where the mandrel locking devices 4 are provided. As shown in FIG. 2, the special chain link pieces 34, 34 are provided with spherical seats 34a, 34a, respectively, on opposing surfaces at their longitudinal center portions. Between the special chain link pieces 34, there is a mandrel locking device main body 4 with a concave cross section longer than this.
1 are connected. This connection is achieved by a spherical bush 42 fitted onto the distal end side, which has a smaller diameter than the base end side, of the connecting pins 42, 42 protruding from the center of both outer surfaces of the mandrel locking device main body 41 in the direction in which the chain 3 is disposed.
This is done by fitting the spherical seats 34a, 42a between the spherical seats 34a, 34a. This connection mode allows the locking tool main body 41 to rotate within a vertical plane with respect to the special chain link piece 34 about the connection pin 42. The connecting pin 4 on the opposite side of at least one special chain link piece 34
2 Position pin 3 slightly deviated downstream from the inserted position
6 is provided in a convex manner. The pin 36 is the locking tool main body 41
It is inserted into an elongated hole 43 bored at a corresponding position. The long hole 43 has the locking tool body 41 connected to the connecting pin 42.
It is longer in the direction that can be rotated around .
The lock main body 41 is allowed to rotate within its longitudinal dimension. That is, it is for regulating the rotation range of the locking tool main body 41.

The width of the groove at the downstream end of the locking tool body 41 is slightly narrower than that at the upstream side, and a groove 44 having an appropriate length is formed in the center of this narrow width part. A locking piece 46 having a concave cross section is fitted into this groove 44 for locking the throat portion MB 1 of the upstream end of the mandrel MB, which is smaller in diameter than the terminal MB ₂ and the throat portion MB ₁ of the downstream side. be. The groove width of the locking piece 46 is slightly larger than the diameter of the throat part MB ₁ of the mandrel MB, and smaller than the diameter of the end part MB ₂ , and the bottom of the groove is a semicircular groove. When the HS is placed on the mounting table 33, the throat portion _MB1 of the mandrel MB is fitted into the mandrel MB with its top surface open.

Then, when the hollow tube HS is fed to the mandrel mill 1 and rolling is started, the mandrel
MB receives a tensile force in the downstream direction from the mandrel mill 1 together with the hollow tube HS, but the mandrel
The upstream end MB ₂ of the MB comes into contact with the locking piece 46 to prevent it from coming off.

Brackets 47, 47 having a rectangular cross section are attached to both sides of the lower surface of the downstream end of the locking device main body 41.
An axle 4 is attached to the lower end of both brackets 47, 47, respectively.
8, 48 are inserted and fixed, and both axles 48, 48
Guide rolls 49, 49 are rotatably attached to the outer ends of the rollers, respectively. The guide rolls 49, 49 roll on the above-mentioned fixed rail 35 and the below-mentioned rail 5, and can smoothly move the locking tool main body 41 in the rolling direction.

Next, the structure of the rail 5 and its surroundings will be explained based on FIGS. 1, 4, and 5. FIG. 4 is an enlarged sectional view taken along the - line in FIG. 1 when the aforementioned locking device 4 is located near the entrance side of the driven sprocket 32, and FIG. 5 is a detailed view of the downstream end of the rail 5. be.

As shown in FIG. 1, on the downstream side of the fixed rail 35, a section having the same shape as the fixed rail 35,
A pair of rails 5, 5, which are long in the rolling direction, are arranged side by side at the same height in the opposite direction of the chains 3, 3. The length of the rail 5 is approximately 1/2 of the distance between the driving sprocket 31 and the driven sprocket 32, and is located on the downstream side in the rolling direction. The aforementioned mandrel locking tool 4
is the fixed rail 3 as chains 3 and 3 move around.
After moving on the rails 5, 35, it moves a little while being suspended from the chains 3, 3 while maintaining the current moving posture, and then moves on the rails 5, 5 to the vicinity of the input side of the driven sprocket 32.

As shown in FIG. 4, the rails 5, 5 are movable in the rolling direction and are fixed to the inner side of the upper end surface of the rail support members 5a, 5a having a T-shaped cross section and arranged in parallel between the frames 21, 21. There is. Rail support part 5
The movement of a, 5a is caused by the movement of the frame 21,
Upper guides 51, 51, lower guides 52, 52, which are slidably fitted with the 21 side sandwiched vertically, and side guides 53, which are slidably fitted on the opposite side thereof, are used in the vertical direction and in the opposing direction of the chains 3, 3. It is guided smoothly without any wobbling. Upper guide 5
1. A plurality of lower guides 52 and side guides 53 are installed at required positions in the rolling direction inside the frames 21, 21, respectively. rail support member 5a,
Racks 5b, 5b are formed at the lower end of 5a. As shown in FIG. 5, the downstream end of the rail 5 is an inclined surface 5c that is inclined downward toward the downstream side (only the rear side in front view is shown in FIG. 5), and the rail support member 5a , 5a also have a similar sloped surface. As shown in FIGS. 4 and 5, the inclined surface 5c of the rail 5 of the rail support members 5a, 5a
and a U-shaped guide member 5 at the corresponding position.
d and 5d are attached with their opening sides facing each other. The roll guide members 5d, 5d are on the lower surface 5e of the upper side.
are inclined downward toward the downstream end side like the inclined surface 5c, and when the guide rolls 49, 49 reach the inclined surface 5c, the upper position of the guide rolls 49, 49 is changed to the lower surface 5e, 5e. The mandrel locking tool 4 is then tilted forward as it goes downstream.
Then, the throat portion _MB1 of the mandrel MB becomes lifted from the locking piece 46, and the lock is released. In this case, the mandrel locking tool 4,
In other words, since the locking tool main body 41 can rotate within the dimensions of the elongated hole 43, there is no possibility that the locking tool main body 41 will cause problems such as moving the chains 3, 3 upward.

Furthermore, as shown in Fig. 1, a support plate 22 is provided directly below the lower moving area of the chains 3, 3, extending over the entire length between the drive sprocket 31 and the driven sprocket 32, and the mandrel MB can be opened to open the driven sprocket. The posture of the mandrel locking tool 4 that has turned around from 32 to the lower surface is kept parallel and returned to the drive sprocket 31 side.

Next, the rail drive device 6 will be explained based on FIG. 6. FIG. 6 is an enlarged sectional view taken along the - line in FIG. 1. Frame 2 on the rear side in the front view at the center between the driving sprocket 31 and the driven sprocket 32
A motor mount 62 is attached to the outer surface of the motor 1.

An electric motor 63 with a brake is mounted on the mounting base 62. The output shaft 63a of the electric motor 63 protrudes on both sides in the direction in which the chains 3, 3 are disposed, and the end located on the frame 21 side is connected to the pinion drive shaft 65 via the reducer 64. is linked to cersin 67. The drive shaft 65 is rotatably supported between the frames 21, 21. Pinions 66, 66 to be engaged with the racks 5b, 5b are fitted in positions of the drive shaft 65 corresponding to the aforementioned racks 5b, 5b, respectively. In such a rail drive device 6, a predetermined drive signal is given to the electric motor 63 from a motor drive control device (not shown) based on rolling information such as the length of the hollow shell HS of rolling symmetry, and the pinions 66, 66 are corrected by a predetermined amount. In the case of reverse rotation, the racks 5b, 5b, that is, the rails 5, 5 can be moved up and downstream in the rolling direction by the required amount. And this amount of movement is Selsin 6
7, and provided to the motor drive control device. The motor drive control device receives this detection signal and issues a drive stop signal to the motor 63. As a result, the rails 5, 5 can be arbitrarily determined within the movable range from the downstream end of the fixed rail 35 to the driven sprocket 32. Therefore, the inclined surface 5 at the downstream end
c, the position of the guide member 5d, that is, the mandrel
The unlocking position of the MB can be arbitrarily selected between the center position between the drive sprocket 31 and the driven sprocket 32 and the entrance side of the driven sprocket 32. Thereby, the mandrel MB lock release position can be set according to the length of the hollow blank tube HS of rolling symmetry. Therefore, when performing the minimum mandrel insertion length rolling mode using the device of the present invention, it is necessary to
Regardless of the length of the HS, the mandrel MB can be unlocked immediately after rolling, so unlike conventional methods, there is no need to transport the mandrel MB at low speed after rolling, which shortens the rolling cycle.
As a result, seamless steel pipe SP can be manufactured efficiently. Furthermore, since there is no risk of the speed deviation as described above occurring for the same reason, there is no risk of flaws occurring on the inner surface of the seamless steel pipe SP. Similarly, when rolling is performed in the constant mandrel insertion length mode, there is no risk of causing the above-mentioned inconvenience.

〔effect〕

As described in detail above, the device of the present invention has a mandrel.
Since the unlocking position of the MB can be set arbitrarily, if this setting is made according to the length of the hollow shell HS to be rolled, the mandrel MB can be set immediately after the rolling of the hollow shell HS is completed. The lock can be released, thus shortening the rolling cycle.
It is possible to improve the manufacturing efficiency of seamless pipes, and there is no risk of degrading the quality of the seamless pipes, etc.
The present invention has excellent effects.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic front sectional view showing the case where the device of the present invention is applied to pipe rolling equipment, and Fig.
3 is a perspective view of the mandrel locking device; FIG. 4 is an enlarged sectional view taken along the line - in FIG. 1; FIG. 5 is a detailed view of the downstream end of the rail; FIG. 6 is an enlarged cross-sectional view taken along the line - in FIG. 1, and FIG. 7 is a process diagram when a conventional device is used to execute the minimum mandrel insertion length rolling mode. 3, 3... Chain, 4... Mandrel locking device, 5... Rail, 5c... Inclined surface, 5b... Rack, 63... Electric motor, 66, 66... Pinion, HS... Hollow tube, MB...Mandrel.

Claims (1)

[Scope of Claims] 1. A hollow tube with a mandrel inserted therein is placed between endless chains that are arranged oppositely and move around in a cooperative manner, and the upstream end of the mandrel is engaged. The pipe rolling equipment is configured to hold the hollow tube in place and control its movement while causing the hollow tube to be rolled by a mandrel mill provided on the downstream side, and to release the locking of the mandrel after the rolling is completed. In the entrance table device, a mandrel locking device is provided between the chains so as to be movable together therewith, and locks the upstream end of the mandrel with the top surface open; and a mandrel locking device that prevents movement of the mandrel locking device. The mandrel locking device is provided with an inclined surface at the downstream end thereof to tilt the mandrel locking tool downstream and release the locking of the mandrel, so that the chain can be moved in the circumferential direction. 1. An entrance table device for a pipe rolling equipment, comprising: a rail having a structure that is configured to allow the locking of the mandrel to be released at any time after the completion of rolling of the hollow blank pipe.