JPS5987924A - Correcting method of material having circular sectional form - Google Patents

Abstract

PURPOSE:To correct the bend of tube end part at high accuracy by making a long material having circular sectional form such as a steel pipe etc. partially eccentric while rotating the pipe by plural sets of roll units consisting of holding rolls having a rotating device and vertically moving device and pinch rolls having a roll opening and closing device and then releasing the eccentricity. CONSTITUTION:In a pipe end correcting machine for steel pipe etc. provided with plural sets of roll units consisting of holding rolls 1 and pinch rolls 2, a rotating device 3 and a roll lifting device 4 are provided separately in each holding roll, and a roll opening and closing device 5 is attached to each pinch roll 2. A steel pipe 6 having bent pipe end part is put into the center of the correcting machine and pinch rolls 2 are pressed against the steel pipe 6 by the roll opening and closing device 5. At the same time, the steel pipe 6 is rotated by rotating the holding rolls 1 by rotating devices 3. The steel pipe 6 is pushed down by operating only the lifting device 4a of intermediate roll unit to make the pipe to an eccentric state. Then, the lifting device 4a is operated reversely to restore the original position and the rotation is stopped. Thus, the bend of pipe end part is corrected with high accuracy and high work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to straightening, and in particular provides a method for straightening sharp edges on the edges of a roll sheet with high accuracy and in a short time, which has been difficult to straighten in the past.

The straightening iF of steel pipes in high-efficiency steel machine production lines is
A continuous roll straightening machine is used. Figure 1(a).

(b) shows a plan view and a side view of a commonly used roll straightening machine. It has a structure in which the steel pipes P that intersect with each other are compressed and fed in a spiral shape. As shown in FIG. 1, the roll arrangement consists of a pair of upper and lower AJ rolls, an il620 roll, a /16 30 roll, and a backing roll with only the lower roll. @Pipe P enters from the direction of the arrow t, gets caught between the upper roll and lower roll of 410 rolls, is sent in a spiral, and is sequentially flattened and deformed between the upper and lower rolls. /I
6I.

Since it is eccentrically set in advance with respect to the A6 30 wheel, it will be sequentially subjected to bending deformation with a span of L. In roller straightening machines that are used continuously, not just copper box straighteners, the material is bent once until it reaches the plastic region (strictly speaking, elastoplastic region) K, and this is repeated in forward and reverse directions to gradually loosen it. However, in a straightening machine for steel pipes, the steel weight is fed in a helical manner to repeatedly bend the steel in the circumferential direction K/Ii at a pitch corresponding to the skew angle. Bending force;
It is corrected by gradually loosening it.

This type of straightening machine has defects that cannot be theoretically avoided.

The first defect is the occurrence of an uncorrectable temperature range force ζ at the end of the tube. In other words, bend straightening is possible only after the steel pipe is forcibly bent to the plastic range as described above, and since there is no support at both ends of the steel pipe at the length where it is roughly adjusted to the low/L/distance, the K III eye is effective. Otherwise, an uncorrected portion will remain.

However, in the straightening machine of the type shown in Figure 1, the upper and lower rolls are placed opposite each other, and the flattening deformation occurs between the upper and lower rolls ((the purpose is to reduce bending stress and improve the roundness of the steel pipe). The actual unstraightened length of the pipe end is the roll interval (L/2) in Figure 1.
is shorter than.

The second defect is that the above-mentioned method of shortening the length of the uncorrected portion is structurally impossible [6]. Although it seems possible to shorten the length of the unstraightened portion by narrowing the interval between each coil, another problem arises in terms of functionality. For example, the roll spacing can be shortened by increasing the roll skew angle (α in Figure 1);
Conversely, the pinch sent in a spiral becomes a dog, ffi+ f
Since the number of times of correction decreases, the accuracy of correction decreases. The roll spacing is determined by the roll diameter and length based on the size and strength of the steel to be used, and the lower limit is determined by constraints on the arrangement of the roll drive system.

End bends that remain at the ends of the produced steel weights are generally detrimental. Since most steel pipes are used by connecting the pipe ends together,
End bending has a great effect on the accuracy of the joint. Connections are made using spring joints in high-grade steel, especially in Urai cages for oil drilling, but the accuracy of the threaded parts is strictly controlled, and bent ends are classified as defective here. Ru. The amount of edge bending has an allowable range depending on the purpose of use, but on a manufacturing line, defective products that exceed the allowable value sometimes occur, obstructing the flow of the line, causing a decrease in efficiency and yield, and resulting in a large amount of damage. This will result in more damage.

A high-efficiency straightening device for bending the ends of steel pipes has been a problem since VCC, and various studies have been conducted, but it has not been put to practical use because of the problems in terms of accuracy and efficiency of straightening the degree of deviation.

The edge straightening machine commonly used at present is a simple hydraulic press straightening machine as shown in Fig. , it is not possible to deal with cases where a large number of bends occur on the production line.In addition, a special bend detection sensor is used in the brace straightening machine to detect the direction and size of bends and store them in the calculator automatically. Straightening methods have been devised, but they have problems such as restrictions on bending, reliability (stability) of straightening accuracy, complexity in equipment configuration, high equipment costs, and low efficiency, so they are not suitable for production line equipment. It is insufficient.

The present invention can address these problems, and has many advantages such as high efficiency, stable straightening accuracy, simple equipment, and no trouble during operation. It provides a method for straightening the bent edges of
The feature is that two or more sets of straightened materials are arranged in the longitudinal direction of the straightened materials, and the shaft centers of the straightened materials have X-parallel axes that rotatably pinch the straightened materials having a circular cross section. While the material to be straightened is being rotated, one of the rotary support units is moved eccentrically by 1/(T) in the diameter direction of the material to be straightened, and the overbend is once examined in all directions on the circumference of the material to be straightened. 5. A method for straightening a material having a circular cross section, in which the eccentricity is sequentially released.

That is, the greatest feature of the present invention is that it is not necessary to detect the magnitude and direction of the bend. Various proposals have been made for correcting edge bends, but the correction ability, correction accuracy, stability, etc. have been sacrificed due to the necessity of checking the bends. Therefore, conventional edge bend straightening machines, which cannot be installed on the production line and are installed as off-line equipment, remove all steel pieces that are thought to have bad edge bends from the online system, measure the bends, and remove those that exceed the allowable value by workers. It had been carefully corrected by hand. On the other hand, according to the present invention, completely online processing is possible, and all the books are allowed to pass regardless of the presence or absence of end bends, thereby eliminating all logistical confusion regarding bend processing.

Next, embodiments according to the present invention will be explained with reference to the drawings.
, 4 are a side view and a front view of a pipe end face straightening machine applied when carrying out the present invention, in which a steel pipe is received into the straightening machine and the pipe end is pinched. The straightening machine consists of a set of three rolls each having a rotational axis that is parallel or nearly parallel to the tube axis. The roll is divided into a roll 1 and a pinch roll 2.
have. The pinch roll 2 is moved downward and opened and closed by the roll opening/closing device 5. The roll J.

2, the rotating device 3, the lifting device 4, and the opening/closing device 5 are called a roller unit.
It consists of 3 units: 1.

The roll rotating device 3, roll lifting device 4, and roll opening/closing device 5 are installed separately for each roller unit, and can be operated and adjusted separately. The steel pipe 6 is transported from the entrance table 7 to the center of the straightening machine by transport equipment (not shown), and the pinch rolls 2 are immediately closed by the operation of the opening/closing device 5. At the same time, the roll rotation device 3 rotates to rotate the steel pipe 6.
rotates. Then, only the lifting device 4a of the /1620-ra unit is activated, and the steel pipe 6 is pushed a predetermined amount.
The state shown in FIG. 5 is established. Then, the lifting device 4a of the /1620-line unit is operated in reverse and returns to the original position shown in FIG. Next, the roll rotation device 3 of all roller units
is stopped, the roll opening/closing device 5 is opened, and the pinch roll 2 is opened.
is opened, and the straightened steel pipe 6 is sent to the payout side table 8 using a conveyance facility (not shown) to complete the process.

As is clear from the above explanation, according to the straightening method according to the present invention, bridge work can be completed with very simple movements, resulting in high efficiency, good straightening accuracy, and stability.

The material to be straightened according to the present invention can be applied not only to the straight pipes shown in FIGS. 3 to 6, but also to the absent pipe 9 shown in FIG. The bearing is adjusted according to the diameter by raising and lowering the roller j and the roll lifting device 4. Also, depending on the outside diameter of the absent part, a speed difference is provided between the roll rotating equipment/Fj 3a and 3b, and the vibration of the absent tube 9 is adjusted. The rotation speed can be controlled to prevent slippage between the body and the abutment part (
(became(・ru)

In the above embodiment, it is assumed that the end bending position is approximately constant, and each roller unit is not moved in the axial direction. However, if the diameter difference of the steel pipe is large or the end bending position is different In order to correct the steel kidney, it may be configured to move uj in the axial direction.

The present invention is not necessarily limited to the configuration as in the embodiment described above, but for example, as shown in FIG.
/7620-The function as a tube end straightening machine is also satisfied even with a configuration in which the L unit is on the holding side. That is, as in the previous embodiment, the steel pipe 10 is placed in a receiver and compressed by the pinch rolls 11, and the roll rotation device 12 is rotated to forcibly rotate the steel pipe 10. Then, using the roll lifting device 13 of the A6 J roller unit, the entire /1610-R unit is lifted up (as shown in Fig. 9), and the recess is sequentially rolled in all directions on the circumference (as shown in Fig. 9). Next, by reversing the roll elevating device M13 at (16), the roller unit is returned to the origin shown in FIG. 10 while loosening the retraction and the correction is completed. This is convenient when the tube end <K or there is a change in the bending position, and the roller unit A2 can be aligned by the moving device 14 from the end of the tube to the bending position. In comparison, the bending position is more flexible.

Also, the combination of rolls does not have to be two rollers and one pinch roller, and the number and arrangement of rolls does not matter, such as a 20-hole or 40-hole guide roll system. Furthermore, instead of rotating the steel pipe with rolls, the rolls may be used as free rolls to chuck the steel pipe and then rotate the steel pipe itself. Also, the roll unit does not necessarily have to be a multiple roller stand system as shown in Figures 3 and 4. For example, as shown in Figure 11, it is made of steel 6.3 mm that also serves as a steel pipe support.
The outer periphery is surrounded by a large number of planetary rolls 15, and the entire device 17
can be moved in the direction of the arrow, and in the present invention, this is collectively referred to as a rotation support unit. It is also possible to have a structure in which the steel pipe does not rotate but revolves and eccentrically on the roll side.

The present invention is effective for straightening not only steel pipes but also all long materials with circular cross sections such as round steel.
It is also effective in improving flattening deformation. Furthermore, the present invention is capable of not only cold straightening but also warm straightening, and it is desirable to arrange it as a warm tube end straightening machine behind the warm roller straightening machine.

As explained above, according to the present invention, the 'AM straightening machine can be incorporated as an online general equipment, so there is no confusion in logistics, and this is most preferable in terms of quality control. Since the products are corrected in exactly the same way, there is no generation of defective products, resulting in great benefits such as improved yields.

[Brief explanation of the drawing]

Figure 1 (al, tbl is a plan view and side view of the most commonly used roll straightening machine, and Figure 2 is a cross-sectional view of a conventionally used press straightening machine for edge edges.
The figure is a side view of an edge straightening machine for carrying out the method of the present invention.
FIG. 4 is a front view of FIG. 3, FIG. 5 is an explanatory diagram showing the retracted state of the apparatus in FIG. 3, FIG. 6 is an explanatory diagram at the end of correction, and FIG. 13 is a side view showing another embodiment of the present invention; FIG. 9 is a diagram showing a retracted state in the apparatus of FIG. 8; FIG.
The figure is a view at the end of correction, and FIG. 11 is a sectional view showing a part of another example of the apparatus to which the present invention is applied. ■...Uke is a roll, 2...Pinch roll, 3.
...Roll rotating device, 4...Roll lifting device,
5. Roll opening/closing device, 6. Steel pipe, 7.
・Entry side table, 8...Outside table, 9...
With upset, ]0 Steel weight, 11...Pinch roll, 12...Roll rotating device, 13...Roll lifting device, 14...Moving device Tomoyuki Yafuki, patent attorney representing patent applicant ( etc.) Figure 3 No, I No, 2 No, 3'#c+, l No, 2 No, 31
No, I No, 2 No, 3 Figure 7 No, I No, 2

Claims (1)

[Claims] Two or more sets of straightening members are arranged in the longitudinal direction, and the shaft center of the straightening member is arranged so that the straightening member having a circular cross section is rotatably held under pressure by a rotary support unit having an axis parallel to X゛. During the rotation, one of the rotary support units is eccentrically oriented in the diametrical direction of the material to be straightened to once apply excessive bending force in all directions on the circumference of the material to be straightened, and then the eccentricity is sequentially released while the clamping state is maintained. A method for straightening a material having a circular cross section.