JPS6076207A - Device and method of manufacturing seamless pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to the manufacture of seamless pipes, and more particularly to a new method and method for the manufacture of economically high quality seamless pipes at relatively low production numbers. The present invention relates to providing a mill assembly.

PROBLEM SOLVED BY THE INVENTION The manufacture of seamless pipes is generally an old and well-known art. Typically, the heated billet is perforated by a press perforator or a cross-roll perforator. The perforated billet then undergoes one or more drawing stages to reduce its wall thickness, adjust its diameter, and increase its length. Typically, the main drawing stage is a mandrel mill, Aracel (
As5el) includes the use of mills, plug mills, or extruders. Of these, mandrel mills are generally accepted as the most productive. However, mandrel mills are expensive equipment and are therefore not easily adapted to economically manufacture patched autothermal tubes at relatively low production runs as contemplated by the present invention. Other above-mentioned stretching methods, on the other hand, have certain quality limitations that are not expensive to install and which tend to limit the end use of the resulting product. For example, due to the relatively rapid transitional changes in roll diameter of the Aracel mill, the surface of the resulting tubular product often has a somewhat "cracked" appearance, making it relatively unsuitable for use in the oil field due to concerns about breakage, for example. Appropriate.

Means for Solving the Problems The present invention enables the production of unique high-quality spliced self-heating tubes with a relatively low capital investment, more or less competitive with the equipment of, for example, the Arasel mill, and yet without the limiting characteristics of the Arasel mill. This paper relates to a new method of manufacturing a jointed self-heating tube that enables the following. The method is more particularly in accordance with the method and apparatus of the present invention, where the primary drawing machine equipment is a Diescher type mill with a restrained mandrel system.

This arrangement allows the so-called "mini mill" (m1ni-rni
In the machine for making joint self-heating tubes for the ``ll)'' section, it has a wide range of sizes of 10 inches (approximately 25.4 m) in diameter and more, and also so-called ``double length'' pipes.
ngth) 96 feet (approximately 29
．． It is possible to produce very high quality tubes with lengths up to 3fi).

Considerations regarding optimal quality and economy are incorporated in the method of the invention by Disher-type restraint.
ed) Before the bar drawing machine, the so-called N(LL and Nα
It is possible to produce a length of two cross-roll piercers. The manufacture of double length tubes is also easily understood with cropped ends (C
τopend) provides significant economy in one point of reduction.

For a more complete understanding of these and other features and origins of the present invention, reference should be made to the following detailed description of the preferred embodiments and accompanying drawings.

Example In the plant layout diagram in Figure 1, billets) (
An inlet cheeple 10 feeds typically cylindrical billets into a rotary furnace 11 of known type. Each billet advances in the direction of rotation through the furnace 11 and is discharged one by one onto a hot billet conveyor 12. A conveyor 12 advances the billet onto a rotary pull 13 into a punching machine where it is placed in a centering machine 14.
is punched in the center by Lochipur 13 with drilling machine
After measuring the billet, Mannesman (Shu αnne SM)
antt, ) type cross-roll drilling VT15, the drilling machine 15 drives the heated billet in a spiral manner over the drilling mandrel in a well-known manner;
Converting a solid cylindrical billet into a perforated and drawn tubular shell.

After pulling out the drilling mandrel, this shell (5he
ll) is attached to the hole punch outlet transition part 17.
It is moved laterally onto the shell insert 18 of the (Dieshe γ) type drawing machine. Disher-type drawing machines have a lateral advance known per se, as shown, for example, in Discher US Pat. No. 1,946.933 and Disher US Pat. Disher mills are widely used, but not limited to, well-known types of cross mills that use relatively large diameter id disks in combination with opposed and angularly related cross rolls. It is a roll perforation/drawing machine.

According to an important aspect of the invention, a decher mill designated by the reference number 19 is used within the capacity of a drawing machine,
A restrained mandrel type mandrel insert 20 is provided. The suppressed mandrel principle is itself well known, e.g. by William Rotsder.
αm Rodder) U.S. Patent N (t3,593,
553. A restrained bar mandrel device 20 is provided for inserting the mandrel into the shell placed on the shell insert 18 and then inserting the shell and mandrel into the rolls of the discharging machine 19. insert at times. Once the tubular shell is on the drawer rolls, the movement of the mandrel bar is restrained and controlled by the bar insertion mechanism and is therefore greatly reduced in relation to the mandrel bar. In fact, at times the mandrel may even stop and move in the opposite direction to the movement of the 71c shishiel. In all cases, the mandrel is restrained from normal free floating movement through the drawing machine as is commonly practiced. In this regard, the use of suppressed bar mandrel devices is known for use with mandrel mills, aracel mills, and so-called transval mills. However, to the applicant's knowledge, this suppressed Parr principle has never been applied to a Discher mill and is unique in its application.

After passing through the restrained bar disher drawing machine 19, the intensively drawn tubular shell is conveyed to a conventional siring mill 21, from where it is placed on a cooling bellow 22. The stretched tubular shell is slowly advanced laterally along a cooling table and placed in a cooling water bath.
boah) 23 and finally transferred onto an unloading conveyor 24.

, the plant layout in Figure 2 has an additional drawing stage of N
It is similar in principle to FIG. 1, except that it is provided by an α2 Mannesmann type drilling/drawing machine. In the system of FIG. 2, the heated billet in the rotary furnace 3o is centered by a centering machine 31 and advanced by a rotary pull 32 into a first stage Mannesmann rotary type crenizer 33. , the solid cylindrical billet is perforated and first stretched in the thinning machine 33 to be formed into a tubular shell. This shell is received by an exit cheeple 34 and a so-called 2-stripper 3 of the Mannesmann type.
Transferred to the 50-pack Lochipur department.

The No. 2 Mannes Mann thinning machine is of course not used for the piercing capability, but is used as a drawing machine to provide the first stage of drawing of the drilled shell. The stretched shell is then transferred from the outlet cheeple 36 to the inlet section 37 of a restrained Birdy-Shear type stretcher 38, as generally described in connection with the layout of FIG. The restrained mandrel type bar insertion machine 39 is the shell insertion machine 3
The mandrel is placed in a shell that is stationary on top of the milling machine, and then both the shell and the mandrel are arranged such that the movement of the mandrel is controllably restrained during the advancement of the tubular shell through the discharging machine. The paper is then passed through a diege 40, a cooling table 41, a cooling water tank 42, and a delivery conveyor 43.

FIG. 3 is a highly schematic illustration of the various stages involved in the layout of FIG.
1 illustrates the loading into and evacuation of hot billet therefrom. The heated solid billet is then perforated in a first stage Mannesmann hardening machine 30. In the second stage, the Mannesmann mill 35 is used as drawing 1 (Na2 carbonizer) to reduce the wall thickness of the tubular shell and draw the shell accordingly. Suppression Birdie - Sharmil 3
At 8, the shell is further stretched to reduce its wall thickness.

In the sizing mill 40, the diameter of the shell is reduced slightly, typically achieved by a slight increase in wall thickness and some degree of elongation.

One of the unique and advantageous aspects of this new V-manufacturing arrangement is that by using a suppressed Birdy Shear mill as the final stage drawing machine, a unique high-quality product can be produced with an annual output of 200,000- This is achievable in mills with modest capital requirements in the range of 250,000 tons, which is well suited for the use of so-called "mini-mills".

In typical operation of a mill according to the layout of FIG. 1, the process can be carried out according to a typical Rawlings IJ. Typical materials range in length from a minimum of 4.79 feet to a maximum of 1.
The billets range from 5 to 10 inches (12.7 to 25.4 mm) in diameter, ranging from 3.08 feet. In this regard, the reference minimum and maximum values in a typical Rollingue scale are not in any way limiting of the invention, but are merely illustrative of the minimum and maximum values of a particular Rollingue scale.

In the first series of Rollingesque drills, the result of drilling the billet in the Mannesmann thinning machine was
It is shown under the heading ``Sensification Machine (Hot)''. For example, outer diameter 5.000 inches (about IZ7c1n), length 7
．． In the case of an initial billet of 50 feet (approximately 228 m),
Its outer diameter is 5.250 inches (approximately 13
．． 34) and its billet is 2.90 times ζ
, or 224 feet (approximately 6.81 m) in length.

The borehole has an internal diameter of 4.36 inches (approximately 11.1 cm) and a wall thickness of 0.446 inches (approximately 1.13 cm).

After being processed in a restrained birdie-shear drawing machine, the same billet was further drawn by a factor of 2.36, or to a total length of 5.85 ft (approximately 16.4 ft), with an outside diameter of 4.823 in. Thickness 0.1
96 inches (approximately o, 49 tx).

If we continue to track the same billet through the Cyson mill,
The length is further increased by 124 times, and the total length is 6.
It will be observed that it stretches up to 5.3 feet. The outer diameter in the sizing mill is &
548, and the wall thickness increases accordingly to 0.219 inch (about 0, s6 cm). After cooling and cutting off the ends, the final completed tube has an outside diameter of 3.500 (approximately 8.9
cn ), 64.00 feet long (approximately 19.5 m)
and a wall thickness of 0.216 inches (0.55 cm).

In a typical rolling schedule, for the layout shown in Figure 1, the typical maximum/minimum initial length for a 5 inch billet is 1.
They are 108 feet (approximately 3.97 trL) and 6.15 feet (approximately 21 m). 10 inches (25,4 cr
a) For billets, the typical maximum initial length is 9.99 feet (approximately 3.04 m) and 5.
86 feet (approximately 1.78 tn). A typical 5 inch billet has a stretch range of 1.6
9 to 292; 10 inches (approximately 25.4 cIn
) For billets, the corresponding range is 2.77 to 3.62
Will. Typical draw in a disher restraint bar drawing machine is 2.05 to 248 for a 5 inch billet.
is within the range of In the case of a 10-inch billet, the stretching is approximately 1.
It ranges from 73 to about 226. In the sizing mill, the draw of the 5°, inch billet is from about 1.24 to about 1
．． It is in the range of 28.

For a 10 inch billet, the draw in the sizing mill is a minimum of about 1.02.

The end of the final completed pipe is of course cut off in order to remove the out-of-specification end. In the final finished product, the 5-inch billet is 45 feet long.
) to 64 feet (approximately x 9.sm); the final outside diameter is constant at 3.500; the billet wall thickness will range from 0.216 to 0.449. For a 10-inch billet, the schedule is a constant length of 48 feet and a 9.625-inch wall thickness ranging from 0.312 to 0.545.
Provides a constant outer diameter of approximately 2445 m). For the 10 inch billet, the primary variable of wall thickness is primarily a function of the initial length of the billet, as can be seen by comparing the starting billet length to the final wall thickness.

The layout of FIG. 1 of the present invention is particularly advantageous when a high degree of concentricity is not a primary requirement and/or when it is not necessary or desirable to provide extremely large lengths from the billet to the final finished tube. is. If the requirements are more stringent, the arrangement of FIG. 2 becomes even more desirable at the cost of providing an additional Mannesmann type thinner to act as a drawer.

In the case of the plant layout shown in FIG. 2, the "typical rolling schedule ■" is applied. The illustrated schedule No. [is 5.3 inches (approximately 13.7c+
x) to 10.5 inches (approximately 26.7 crfL), with initial lengths from 9.71 feet (approximately 295 cm) to 19
．． 24 feet (approximately s, s s m ), ranging from i 0.51 feet (3,19 approx.) to 15.92 feet (approximately 4.83 rn ) for 10-inch billets. In this respect, the term 15-inch billet is used in conjunction with the typical rolling skate soyur.
and "10 inch billet" are 5.375 (about 13.7 cm) and 10.5 inches (about 26.7 crr) respectively.
L) means the billet diameter.

In a vertical machining/sharpening machine, the billet is processed with almost no change in outer diameter. 5 inch billet is 1.
35 to 1.78 times, while the 10 inch billet is stretched within the range of 1.71 to 1.96 times. No. The maximum/minimum wall thickness for a 5-inch billet in a thinning machine is 0.911 (approximately 2.3α).
) and 1.315 inches (approximately 3.34 cwL).

In the case of a 10-inch billet, the wall thickness is 1.578 (approximately 4.
Ocra ) to 1.863 inches (approximately 4.73 c
rrL).

In the plant layout of FIG. 2, the first stage of drawing is carried out in a so-called N[L2 Mannesmann through drawing machine. 5-inch billets are drawn within the range of 1.35 to 1.78, while 10-inch billets are drawn to 1.7
It is stretched in the range of 1 to 1.96. The wall thickness decreases as shown in the rolling schedule for the motos headed Nα1 and Nα1 and Nα2.

In the process of the present invention, the second stage of drawing is carried out in a suppressed Birdy-Shear mill. In the case of a 5-inch billet, the stretching in the Disher mill is ZO6 to 247.
It is within the range of. In the case of a 10-inch billet, the stretching is 1.
In the range from 74 to 2.28i, the reeds and wall thickness decrease slightly. Over the range of initial billet diameters and lengths in a typical rolling schedule, after drawing in a decher mill, the tubular lengths range from about 67.76 feet to about 94.84 feet. 2
&9 倶), with a corresponding substantial reduction in wall thickness from the Arashi 2 thinning machine.

Further stretching in the sizing mill is from about 1.09 to about 1.32 in the case of a 5-inch billet;
For a 0 inch billet it would be about 1.06.

After cooling and end trimming, typical tube diameters are
5 (approximately 8.9 cm) to 9.625 inches (approximately 24
, 4 cm), length 80.95 (approximately 246%) to 96,00 ft (approximately every 29.2) and wall thickness 0.21
6 (5,s sn ) to 0.625 inches (approximately 15.
It will cover up to 9 songs). In this regard, any shell length greater than 96 feet after sizing milling will be trimmed to the standard maximum length of 96 feet.

In any of its basic exemplified forms, the method of the present invention can be implemented in a simple apparatus requiring minimal capital investment for economical and efficient operation on a mini-mill basis. It has a substantial advantage in providing relatively high quality seamless tube production pot milling in installations.

One of the important aspects of this new mill equipment is the use of a suppressed Birdy Shear mill as the final drawing stage. In this respect, Disher Mill is unique in several respects. First, it uses a restraining mandrel, which is known in other types of rolling mills but which, to the applicant's knowledge, has never been used in a discharging mill. . Secondly, in the method of the invention, the drawn tube exits the exit side of this mill at a circumferential speed that is approximately equal to, or only minimally faster than, the processing speed of the Disher mill. It is desirable and effective for a disk mill to drive the id disk. Although some deisher mills used strictly for drilling use disk speeds substantially in the output speed range of the mill, existing deisher drawer equipment, to the knowledge of the applicant, is capable of processing The disc circumferential speed is operated at two to three times the speed.

For the operation of the disher mill in one restraint bar mode according to the invention, the bar insertion mechanism is designed for high speed forward and backward movement as well as low speed forward and backward movement and is controlled in movement during mill operation. The bar insertion machine must, of course, accommodate maximum drilling and (in the case of the plant layout of FIG. 2) complete retraction of the mandrel beyond the end of the stretched shell. As shown in a typical Rollinges shell, the maximum length of the stretched shell after leaving the No. 2 flowering shell is about 48 feet.

In accordance with the present invention, the mandrel bar has a working area on the order of 10 feet long at its forward end and a non-working portion of the bar, e.g. 63 feet long, or a "dummy". It can have a dwrrany moon part.

4-8 illustrate a typical sequence of operation of the restraining bar mandrel and tubular shell during stretching in a restraining bardy shear drawing machine. The number 18.20 generally refers to the shell inserter and bar inserter on the loading side of the Disher mill, and the Disher mill generally has the reference number 1
Il indicated by 9. In the loading configuration, the mandrel 50 is fully retracted to a position where the mandrel tip 51 opens the shell insert sufficiently for loading of the tubular shell 52 depending on what length is to be processed.

After loading the upper shell insert, the mandrel thrust block 53 is actuated to advance the mandrel 50 forward through the interior of the hollow shell 52 until the mandrel's tip region 51 emerges from the tip of the tubular shell. The mandrel may protrude slightly from the front end of the shell. A distance of about 2 feet (about 0.6 tn) is common. During the bar insertion phase, forward movement of the tubular shell 52 is restrained by the retaining plate 54, which has been raised into a position to engage the tubular shell, while allowing passage of the mandrel.

After inserting the mandrel par for the first time, the shell holding plate 54 retreats, the shell pushing plate 55 moves forward, and the thrust block 5
Move forward with 3 and stretch the shell and mandrel par together! Move into the throat of 19.

Once the tubular body 52 engages the working rolls of the disher drawing machine, further movement of the shell is controlled by these rolls. At this stage, the thrust block 53 is
The speed of the free-floating mandrel par is also suppressed so that forward movement of the thrust block 53 can continue, albeit at a physically low speed ratio.

For example, 70 to 75 feet (approximately 213 m to 22,8
The mandrel par is restrained during the advancement of the shell in the 3o feet (approx. is allowed to move forward a distance of

When the rear end of the tubular shell passes through the throat of the mill, the mandrel and the shell are separated by a stripping device, which may be a set of rolls or a retractable strip plate. are moved forward together i distance until they reach .

At this stage, the mandrel is retracted relative to the drawn tube, completely separating the mandrel and allowing it to continue on its own to the next operating step, the sizing tube. The mandrel is then fully retracted through the throat of the mill and upstream of the shell inserter in preparation for introducing the next shell into the disher drawer stage.

When the rear end of the shell leaves the throat of the drawing machine, the mandrel thrust block 53 is released for forward movement along with the shell to a point just beyond the stripper plate 56, as shown in FIG. reference). The strip arm plate is then lifted to engage the rear end of the shell, after which the mandrel parr 50 separates the mandrel from the drawn shell and prepares the shell for further processing in the sizing mill and the next process step. , and is retreated by the thrust block 53. At this time, the mandrel parr 50 is completely retracted in preparation for loading the next shell. Depending on operating conditions, the mandrel can be immediately relubricated and reused, or removed for cooling and/or lubrication and replaced with a new mandrel.

An important aspect of this new method is that the mandrel parr allows the shell to float freely with the shell as it passes through the deisher mill, while physically restraining the speed at which the shell exits the deisher drawer. This is the use of a suppressor-type disher mill that is physically restrained from moving forward at a speed that is a fraction of the speed of the machine. Typically, the advancement of the mandrel by 1° will be less than 10 times the advancement speed of the shell drawn from the outlet side of the disher drawing machine. Furthermore, the guide disc installed on the disher mill is operated in a manner typical of modern disher drilling machines rather than disher stretching m, in which the circumferential speed of the guide disc is It is approximately the output speed of the drawn tube, rather than two to three times the speed of typical known prior art means.

The layout shown in Figure 2 is 96 feet (approximately 29.
It is particularly advantageous for processing long billets in order to achieve so-called "double length" tubes up to a truncated length of 2 m). There is a two-stage management drill, firstly for penetration purposes and secondly for use as a KNa2 drill (drawer), followed by a Disher drawer.

EFFECTS OF THE INVENTION According to the present invention, it is possible to achieve high quality seamless tubes having a total draw ratio of greater than 11 to 1 in billet to final finished tube ratio when output from a cysong mill. With the relatively modest capital investment associated with a typical high-productivity seamless tube manufacturing machine, it is possible to produce quality seamed self-heating tubes at yields in excess of 200,000 tons per year. Of course, the specific manner illustrated and described in this application is to be understood as being intended as exemplary only, as certain changes may be made without departing from the explicit teachings of the disclosure. It is. Accordingly, reference should be made to the appended claims to determine the full scope of the invention.

[Brief explanation of the drawing]

1 and 2 show a mill assembly (m1l) according to the invention.
l complex ), the device in Figure 1 utilizes a single = cross-roll Senka-like, while the device in Figure 2 uses two within the capabilities of NIILI and Omi2 Senka-like, respectively. Two cross-rolled flowers are used. FIG. 3 is a highly simplified schematic diagram of the major steps involved in manufacturing a spliced autothermal tube according to the teachings of the present invention. m; 4 dimensions [D: (d) Continuous diagrams illustrating the motion of the shell and mandrel in a suppressed mandrel discharging mill. 11130...Rotary furnace, 12,24.43...
... Conveyor, 13, 34, 36, 41 tatami...
War/Table, 14, 31... Alignment machine, 15
...Cross Roll Senka-sama, 17...
Desalination machine outlet.

Claims (1)

[Claims] 1. (α) supplying a heated billet with a predetermined length and diameter; (b) drilling the heated billet using a cross-roll drilling device to form a hole of approximately 60% to Approximately 27
(C) drawing the perforated and heated billet by a disher-type loss roll drawing machine having an internal mandrel; restraining the movement of the mandrel relative to the velocity of the billet downstream of the rolls (the perforated billet is further reduced by approximately 60%);
(e) sizing the perforated and stretched billet. 2. (α) performing an intermediate stretching operation using a perforated cross-roll stretching machine; (b) about 30% to about ioo%;
(C) carrying out a drilling operation to effect the stretching of the material;
A method according to claim 1, further characterized in that an intermediate stretching operation is carried out in order to effect further stretching of the billet from 30% to 100%. 3. (α) supplying a heated solid billet of a predetermined length and diameter; (b) in a Mannesmann type cross-roll drilling machine to effect the stretching of the billet by an amount of about 60% to about 270%; Drilling the billet with (
C) further stretching the perforated billet to an amount from 0% to 160% by a discher-type cross-roll drawing machine with an internal mandrel (with the dee 7
A method of manufacturing a spliced autothermal tube comprising constraining a mandrel of a disher drawing machine to advance at a speed not greater than about 1/6 of the advancement speed of the drawn tube on the discharge side of the yarn mill. - 4. (a) operating the guide disc of the disher mill at a circumferential speed that does not substantially exceed the output speed of the elongated tube being discharged from the disher mill; The method described in Scope No. 3. 5. The method according to claim 3, further comprising: (a) performing an intermediate stretching step by means of Mannesmann cross-roll perforation type i-stretching. 6. (a) means for supplying a heated billet; and (b)
(c) a Mannesmann-type cross-roll perforation-type stretching machine downstream of the perforation machine; and (c) a discher-type cross-roll stretching machine downstream of the perforation-type stretching machine. (e) the mandrel is adapted to move through the drawing machine at a speed substantially less than the speed of a free floating mandrel, for controllably restraining the mandrel par of the disher-type drawing machine; An apparatus for producing a jointed self-heating tube, characterized in that it comprises the following means: 7. (α) the discharging machine having opposing guide disks; and (b) the process of the pipe passing through the discharging machine. 7. The apparatus of claim 6 further comprising means for driving the disk at a circumferential speed not substantially exceeding the output speed.