JP6070742B2 - Skelp head making device and skelp head making method, and forged pipe manufacturing equipment and method for manufacturing forged pipe - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a skelp head making device and a skelp head making method for making a head of a skelp tip portion before charging a heating furnace when manufacturing a wrought tube, and a wrought tube manufacturing equipment and a manufacturing method using the same. .

  Forged welded pipe, which is a kind of welded pipe, is obtained by heating a skelp obtained by cutting from a steel strip to a high temperature of about 1200 to 1400 ° C. in a heating furnace, and then in a molding / forging machine provided at the latter stage of the heating furnace. It is manufactured by forming into a tubular shape with a forging roll, further forging the end of the tubular skelp, and correcting it to a predetermined outer diameter and thickness (for example, Patent Documents 1, 2, and 3).

Japanese Patent Laid-Open No. 10-277636 JP-A-11-333515 JP 2010-137232 A

  By the way, since the heating furnace is hot, when a plate-shaped skelp is inserted into the heating furnace, a “sag” due to heat is generated at the tip of the skelp, and the tip of the skelp falls between the skids in the heating furnace. May not pass through the furnace.

  In order to prevent such inconvenience, the worker sometimes performs so-called “head-making”, which increases the rigidity by bending and correcting the tip of the skelp manually using a bar hammer. There is a risk of bruises. Moreover, when an operator performs such a bending correction work manually, it takes time and is difficult to correct the bending to a desired shape.

  The present invention has been made in view of such circumstances, and in the manufacture of a forged welded tube, the tip of the skelp before being inserted into the heating furnace is surely desired regardless of the manual operation of the operator. It is an object of the present invention to provide a skelp head making apparatus and a skelp head making method capable of making a head in the shape of the above, and a forging welded pipe manufacturing equipment and manufacturing method.

The present inventors have repeatedly studied to solve the above problems.
Conventionally, as a technique for bending an end portion of a plate material, a press-type end bending apparatus (for example, Japanese Patent Application Laid-Open No. Sho 63-123531) using a die and a punch, or both edge portions of a plate material by roll forming. There is an apparatus for bending upward (for example, JP-A-61-159225). However, these are not intended to make a skelp head, and there is no example of making a skelp head.

  As a result of studying the technique of bending the end of the above plate material, the former press type device is to feed the plate material while performing press correction, so the edge bending does not continue smoothly, and in the unsteady part There is a concern that the required bending cannot be obtained, and it is necessary to process the edge of the plate material suddenly, so the equipment use becomes large and the equipment cost increases, and it turns out that it is not suitable for making a skelp head did.

  On the other hand, the latter roll forming does not have such a problem and is a technique applicable to a skelp head making apparatus. However, the technique of the above-mentioned Japanese Patent Application Laid-Open No. Sho 63-123531 is not applied to a skelp head making apparatus. It was not possible to apply, and it was found that optimization as a skelp head making device is necessary.

  The present invention has been completed based on these findings and provides the following (1) to (16).

(1) A skelp head making device for making a head of a skelp tip at the stage before charging a heating furnace when manufacturing a forged pipe,
It comprises a plurality of forming rolls that bend both ends in the width direction of the skelp tip with sandwiching the skelp between the upper roll and the lower roll,
A fold portion is formed by bending the both ends in the width direction of the skelp tip portion downward by roll forming using the molding roll while moving the skelp tip portion in the arrangement direction of the plurality of molding rolls. Skelp head making device.

  (2) According to (1), the plurality of forming rolls are configured such that a bending angle of the bent portion increases stepwise from an inlet forming roll to an outlet forming roll. Skelp head making device as described.

(3) As the plurality of forming rolls, there are three forming rolls of a first forming roll, a second forming roll, and a third forming roll in order from the entry side,
The first forming roll, the second forming roll, and the third forming roll are formed with an upper roll and a lower roll so that the bending angle of the bent portion of the skelp tip is 30 degrees, 60 degrees, and 90 degrees, respectively. The skelp head making apparatus according to (2), characterized in that:

  (4) The upper roll and the lower roll of the plurality of forming rolls have a shape such that a portion other than the bent portion of the skelp tip is formed into an upwardly convex R shape. The skelp head making apparatus according to any one of (1) to (3).

  (5) The skelp head according to any one of (1) to (4), further comprising an upper bending mechanism that bends the tip of a skelp tip portion in which a bending portion is formed by the plurality of forming rolls. Making equipment.

  (6) The skelp head making apparatus according to any one of (1) to (5), wherein a width of the bent portion is 10 to 100 mm.

(7) The upper roll of the forming roll is provided to be movable up and down relative to the housing,
Further comprising a lifting prevention member provided so as to be fixed to the housing at a position lower than the rising position of the upper roll above the skelp plate passage,
After the bending of the skelp tip by the forming roll is finished, when the skelp is raised along with the rise of the upper roll, the skelp comes into contact with the lifting prevention member, and the upper roll is further raised, The skelp head making apparatus according to any one of (1) to (6), wherein the skelp is separated from the upper roll.

(8) A skelp head making method for making a head of a skelp tip at the stage before charging a heating furnace when manufacturing a forged pipe,
While sandwiching the squelch tip between the upper roll and the lower roll in the plurality of molding rolls, bending by roll forming using the molding roll while moving the skelp tip part in the arrangement direction of the plurality of molding rolls, A method for making a skelp head, comprising bending the both ends of the skelp tip in the width direction downward to form a fold.

  (9) The skelp tip is bent by the plurality of forming rolls so that the bending angle of the bent portion gradually increases from the input forming roll to the output forming roll. The method for making a skelp head as described in 8).

  (10) As the plurality of forming rolls, three forming rolls of a first forming roll, a second forming roll, and a third forming roll are used in order from the entry side, the first forming roll, the second forming roll, the first forming roll, (3) The skelp head making method according to (9), wherein the bending angle of the bent portion of the skelp tip is set to 30 degrees, 60 degrees, and 90 degrees, respectively, by three forming rolls.

  (11) The skelp according to any one of (8) to (10), wherein a portion other than the bent portion of the skelp tip is formed into a convex R shape by the plurality of forming rolls. How to make a head.

  (12) The method of making a skelp head according to any one of (8) to (11), wherein a tip of a skelp tip part in which a bending part is formed by the plurality of forming rolls is bent upward by an upward bending mechanism. .

  (13) The method of making a skelp head according to any one of (8) to (12), wherein a width of the bent portion is 10 to 100 mm.

  (14) The upper roll of the forming roll is provided so as to be movable up and down with respect to the housing, and when the skelp is raised along with the rise of the upper roll after the bending of the skelp tip by the forming roll is finished. In addition, the skelp is brought into contact with a lifting prevention member provided so as to be fixed to the housing at a position lower than the rising position of the upper roll above the skelp passage plate path, and the upper roll is further raised. The skelp head making method according to any one of (8) to (13), wherein the skelp is separated from the upper roll.

(15) Forged pipe manufacturing equipment for manufacturing forged pipe from skelp,
A skelp head making device that makes the head of the skelp tip,
A heating furnace that heats the skelp with its head made at the tip,
A skelp heated in a heating furnace is formed into a tubular shape and equipped with a molding / forging machine that forges the ends of the skelp.
The skelp head making device has any one of the constitutions (1) to (7).

(16) A forged pipe manufacturing method for manufacturing a forged pipe from a skelp,
Making the head of the skelp tip,
Next, heating the skelp with the head made at the tip by a heating furnace,
Thereafter, forming the skelp heated in the heating furnace into a tubular shape, and forging the end portion to produce a forged welded tube,
The head of the skelp tip is made by any of the methods (8) to (14).

  According to the present invention, the head can be surely formed in a desired shape at the tip of the skelp before being inserted into the heating furnace without depending on the manual operation of the operator.

It is a block diagram which shows the forged pipe manufacturing equipment which concerns on one Embodiment of this invention. It is a side view which shows schematic structure of the skelp head making apparatus used for the forged pipe manufacturing equipment of FIG. It is sectional drawing by the AA line of FIG. It is sectional drawing which shows the state which changed the roll width adjustment color and narrowed the roll width. It is a figure which shows the cross-sectional state of a 1st shaping | molding roll, a 2nd shaping | molding roll, and a 3rd shaping | molding roll. It is a figure which shows the state which bent the front-end | tip of the front-end | tip part of the skelp after the bending process in the skelp head making apparatus with the raising roll. In a skelp head making apparatus, it is a figure for demonstrating the state which a skelp raises with an upper roll when an upper roll is raised after a bending process. It is a side view which shows schematic structure of the skelp head making apparatus provided with the raising prevention member which prevents that a skelp raises with an upper roll and raises when raising an upper roll.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a block diagram showing forged pipe manufacturing equipment according to an embodiment of the present invention. The forged pipe manufacturing equipment 100 of this embodiment includes a skelp head making device 200, a heating furnace 300, and a molding / forging machine 400.

  Among these, the heating furnace 300 and the forming / forging machine 400 are configured in the same manner as the conventional forged pipe manufacturing equipment, and the skelp head making apparatus 200 is newly introduced in the present invention.

  The heating furnace 300 heats the skelp while continuously transporting the skelp, and heats the skelp while the skelp is placed on the skid.

  The forming / forging machine 400 forms the skelp heated in the heating furnace 300 into a tubular shape by a forging roll, then forges the width end of the tubular skelp, and further corrects it to a predetermined outer diameter and thickness. Is.

  Next, the skelp head making apparatus 200 will be described with reference to FIGS. FIG. 2 is a side view showing a schematic configuration of the skelp head making apparatus 200, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  The skelp head making device 200 is configured as a roll forming device, and a first forming roll 1 that performs bending processing on both ends (edges) in the width direction at the housing 20 and the tip portion (about 7 m tip) of the skelp (plate) S. The second forming roll 2 and the third forming roll 3 are provided. The first forming roll 1, the second forming roll 2, and the third forming roll 3 are arranged in that order from the entry side to the exit side of the skelp S. The first forming roll 1, the second forming roll 2 and the third forming roll 3 have an upper roll 1a and a lower roll 1b, an upper roll 2a and a lower roll 2b, an upper roll 3a and a lower roll 3b, respectively. . The upper rolls 1 a, 2 a, 3 a are moved up and down with respect to the housing 20 by the drive mechanism 4. The upper rolls 1a, 2a, 3a are lowered by the drive mechanism 4 while conveying the skelp S in the direction of the forming rolls indicated by the arrows, and the skelp S is moved to the upper rolls 1a, 2a, 3a and the lower rolls 1b, 2b, 3b. The skelp S is bent by being sandwiched between them.

  Further, the skelp head making apparatus 200 has a rising roll 5 provided on a further rear side of the third forming roll 3 on the outlet side. The ascending roll 5 is for bending the tip of the distal end portion of the skelp after bending upward, and this ascending roll 5 is indicated by a standby position indicated by a solid line in FIG. It can move between the raised position. That is, the ascending roll 5 and the cylinder 6 constitute an upward bending mechanism. And the front-end | tip of the front-end | tip part of the bent skelp S can be bent upward now by moving the raising roll 5 from a standby position to a raising position. The bending angle of the tip at this time can be up to 50 degrees.

  As shown in FIG. 3, the upper roll 1a and the lower roll 1b of the first forming roll 1 have roll shafts 7a and 7b, respectively, and bearings 8 are provided on the roll shafts 7a and 7b. . Further, the upper roll 1 a can move up and down along the vertical axis 9.

  The upper roll 1a has a concave cross section in the plate width direction, and the lower roll 1b has a convex cross section in the plate width direction corresponding to the cross sectional shape of the upper roll 1a. Specifically, the center portion of the upper roll 1a and the lower roll 1b has a corresponding R shape, and both end portions of the upper roll 1a and the lower roll 1b have the widthwise end portions of the skelp S downward. It has a shape that is angled so that it can be bent to form a bent portion. At this time, the shape of both ends of the upper roll 1a and the lower roll 1b is such that the width (height) of the bent portion of the skelp S is 10 to 100 mm, for example 50 mm, and the bent angle of the bent portion is 30 degrees. It has a shape.

  The upper roll 1a and the lower roll 1b each have two divided rolls divided in the plate width direction, and the roll width can be adjusted by adjusting these positions in the width direction. A roll width adjusting collar 10 for adjusting the width in the plate width direction is interposed between the divided rolls of the upper roll 1a and the lower roll 1b. The roll width adjusting collar 10 can be removed. When the roll width is narrowed, the roll width adjusting collar 10 is removed, and the divided rolls of the upper roll 1a and the lower roll 1b are arranged at the center as shown in FIG. And the roll width adjusting collar 10 is changed to the outside of the divided rolls.

  The second forming roll 2 and the third forming roll 3 are configured in the same manner as the first forming roll except for the shapes of the upper roll and the lower roll. Specifically, the shapes of both ends of the upper rolls 2a and 3a and the lower rolls 2b and 3b are different from those of the upper roll 1a and the lower roll 1b. That is, as shown in FIG. 5A, the shape of both ends of the upper roll 1a and the lower roll 1b of the first forming roll 1 is such that the folding angle of the bent portion of the skelp S is 30 degrees. As shown in FIG. 5 (b), the shape of the both ends of the upper roll 2a and the lower roll 2b of the second forming roll 2 is such that the bending angle of the bent portion of the skelp S is 60 degrees. As shown in FIG. 5C, the shape of both ends of the upper roll 3a and the lower roll 3b of the third forming roll 3 is such that the folding angle of the bent portion of the skelp S is 90 degrees. For this reason, the bending angle of the bent portion of the skelp S is adjusted so that it gradually increases from the first forming roll 1 on the entry side to the third forming roll 3 on the exit side, and finally becomes 90 degrees. . In the 2nd shaping | molding roll 2 and the 3rd shaping | molding roll 3, the shape of the center part of upper roll 2a, 3a and lower roll 2b, 3b is the same as the upper roll 1a and the lower roll 1b. That is, the R shape of the upper roll and the R shape of the lower roll of each forming roll are the same. For this reason, the bent skelp S has a bent portion at the end in the width direction bent by 90 degrees, the central part has an upwardly curved R shape, and the tip of the skelp S has a semi-cylindrical shape (that is, an upwardly convex shape). A “head” with a curved shape is created.

Next, the forging pipe manufacturing operation in the forging pipe manufacturing equipment 100 configured as described above will be described.
First, the head of the tip portion of the skelp S is made by the skelp head making device 200. At this time, the skelp S is loaded from the first forming roll 1 side, and the upper rolls 1a, 2a, 3a are lowered by the drive mechanism 4 as shown in FIGS. The roll forming by the 1 forming roll 1, the 2nd forming roll 2 and the 3rd forming roll 3 forms bent portions at both ends in the width direction of the skelp S, and the bending angle is 30 degrees → 60 degrees → 90 degrees. In addition, the central portion other than the bent portion has an upwardly convex R shape. As a result, a kamaboko-shaped “head” is formed at the tip of the skelp S having a length of about 7 m.

  Further, as shown in FIG. 6, even if the tip of the tip portion of the skelp S after being bent by the first to third forming rolls 1 to 3 is bent upward by raising the rising roll 5. Good. After bending the tip of the skelp S upward, the ascending roll 5 is returned to the retracted position indicated by the two-dot chain line in FIG.

  After finishing the bending of the front end portion of the skelp S by the first to third forming rolls 1 to 3, the upper rolls 1a, 2a, 3a are raised without bending the rear portion of the top portion of the skelp S. Let it pass.

  By the way, when the upper rolls 1a, 2a, 3a are raised after bending in the skelp head making apparatus 200, as shown in FIG. 7, the skelp S bites into the upper roll 3a at the end, It may rise with the roll 3a and float. When such skelp S is lifted, it is necessary to eliminate it manually by the operator, which is complicated.

  In order to prevent this, as shown in FIG. 8, it is preferable to provide a lifting prevention member 11 located above the plate passage of the skelp S. The floating prevention member 11 is fixed to the housing 20 and is provided so that the lower end thereof is at a lower position than the lower ends of the upper rolls 1a, 2a, 3a at the raised position.

  By providing the lifting prevention member 11, when the upper rolls 1a, 2a, 3a are raised after the bending process of the tip portion of the skelp S is finished, the skelp S bites into the upper roll 3a at the end, and the upper roll Even if it rises with 3a, the skelp S abuts against the lifting prevention member 11 and is prevented from rising further. For this reason, when the upper roll 3a further rises, the skelp S is separated from the upper roll 3a, and the skelp S is prevented from rising. Thereby, the biting into the upper roll of the skelp S can be quickly eliminated. In addition, it is preferable that the installation position of the lifting prevention member 11 is 100 to 200 mm above the skelp S to be passed.

  After the head is made by the skelp head making apparatus 200, the skelp is continuously heated to about 1200 to 1400 ° C. by the heating furnace 300, and the heated skelp is conveyed to the molding / forging machine 400 and made into a tubular shape by a forging roll. Further, the end of the tubular skelp is forged and is corrected to a predetermined outer diameter and wall thickness to obtain a forged tube.

  In this way, the skelp head making apparatus 200 creates “heads” formed with bent portions bent downward at both ends in the width direction of the tip part of the skelp S, so that the rigidity of the tip part of the skelp S increases. In the next heating furnace 300, it is possible to make it difficult for “sag” due to heat to occur, and it is possible to prevent a passage failure due to the dropping of the tip portion of the skelp S in the heating furnace 300.

  As described above, since the “head” is created at the tip of the skelp S by the skelp head making device 200 optimized for head making, the head of the skelp is surely formed in a desired shape regardless of the manual work of the operator. Can make.

  Further, by roll forming using a plurality of forming rolls 1 to 3, the folding angle at both ends in the width direction of the skelp S is gradually increased to 30 degrees, 60 degrees, and 90 degrees. The equipment load is not large and the apparatus configuration does not become large.

  Further, since the central portion other than the bent portion of the tip portion of the skelp S has an upwardly convex R shape, and the entire tip portion has a semi-cylindrical shape, the skelp after coming out of the heating furnace 300 is molded and forged. It can be made easy to bite into the forging roll.

  Furthermore, by using the ascending roll 5 to bend the tip of the skelp S formed by bending both ends in the width direction upward, it is possible to more effectively suppress the “sag” of that part. it can.

  Furthermore, since the upper rolls 1a to 3a and the lower rolls 1b to 3b constituting the forming rolls 1 to 3 of the skelp head making apparatus 200 can adjust the roll width using the roll width adjustment collar 10, various Can accommodate width skelps.

  Furthermore, since the lift prevention member 11 that prevents the skelp S from rising as the upper roll rises is attached to the housing 20 of the skelp head making apparatus 200, the skelp S is prevented from biting into the upper roll and rising up. be able to.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the case where the number of forming rolls of the head making device is three has been described. However, the number is not limited to three as long as the bending angle of the bent portion can be changed stepwise. The bending angle is not limited to 30 ° → 60 ° → 90 °, and may be changed at an appropriate angle according to the number of forming rolls. However, from the viewpoint of increasing rigidity, the final angle of the bent portion is preferably 90 degrees.

DESCRIPTION OF SYMBOLS 1 1st forming roll 1a, 2a, 3a Upper roll 1b, 2b, 3b Lower roll 2 2nd forming roll 3 3rd forming roll 4 Drive mechanism 5 Ascending roll 6 Cylinder 7a, 7b Roll shaft 8 Bearing 9 Vertical shaft 10 Roll width Adjustment collar 11 Lifting prevention member 20 Housing S Skelp

Claims (16)

A skelp head making device that makes the head part of the skelp at the stage before charging the heating furnace when manufacturing the forged pipe,
It comprises a plurality of forming rolls that bend both ends in the width direction of the skelp tip with sandwiching the skelp between the upper roll and the lower roll,
A fold portion is formed by bending the both ends in the width direction of the skelp tip portion downward by roll forming using the molding roll while moving the skelp tip portion in the arrangement direction of the plurality of molding rolls. Skelp head making device.   2. The skelp according to claim 1, wherein the plurality of forming rolls are configured such that a bending angle of the bent portion increases stepwise from an inlet forming roll to an outlet forming roll. Head making device. As the plurality of forming rolls, there are three forming rolls of a first forming roll, a second forming roll, and a third forming roll in order from the entry side,
The first forming roll, the second forming roll, and the third forming roll are formed with an upper roll and a lower roll so that the bending angle of the bent portion of the skelp tip is 30 degrees, 60 degrees, and 90 degrees, respectively. The skelp head making apparatus according to claim 2, wherein   The upper roll and the lower roll of the plurality of forming rolls have a shape such that a portion other than the bent portion of the skelp tip is formed into an upwardly convex R shape. The skelp head making apparatus according to any one of claims 3 to 4.   The skelp head making according to any one of claims 1 to 4, further comprising an upward bending mechanism that bends the tip of a skelp tip portion in which a bent portion is formed by the plurality of forming rolls. apparatus.   The skelp head making apparatus according to any one of claims 1 to 5, wherein a width of the bent portion is 10 to 100 mm. The upper roll of the molding roll is provided so as to be movable up and down relative to the housing.
Further comprising a lifting prevention member provided so as to be fixed to the housing at a position lower than the rising position of the upper roll above the skelp plate passage,
After the bending of the skelp tip by the forming roll is finished, when the skelp is raised along with the rise of the upper roll, the skelp comes into contact with the lifting prevention member, and the upper roll is further raised, The skelp head making apparatus according to any one of claims 1 to 6, wherein the skelp is separated from the upper roll. A skelp head making method for making a head of a skelp tip part at a stage before charging a heating furnace when manufacturing a forged pipe,
While sandwiching the squelch tip between the upper roll and the lower roll in the plurality of molding rolls, bending by roll forming using the molding roll while moving the skelp tip part in the arrangement direction of the plurality of molding rolls, A method for making a skelp head, comprising bending the both ends of the skelp tip in the width direction downward to form a fold.   The skelp tip portion is bent by the plurality of forming rolls so that a bending angle of the bent portion gradually increases from an entrance-side forming roll to an exit-side forming roll. How to make the skelp head.   As the plurality of forming rolls, three forming rolls of a first forming roll, a second forming roll, and a third forming roll are used in order from the entry side, and the first forming roll, the second forming roll, and the third forming roll. The skelp head making method according to claim 9, wherein the bending angle of the bent portion of the skelp tip is set to 30 degrees, 60 degrees, and 90 degrees, respectively.   11. The skelp head according to claim 8, wherein a portion other than a bent portion of the skelp tip is formed into an upwardly convex R shape by the plurality of forming rolls. How to make.   The skelp head making method according to any one of claims 8 to 11, wherein a tip end of a skelp tip portion in which a bending portion is formed by the plurality of forming rolls is bent upward by an upward bending mechanism.   The width of the said bending part is 10-100 mm, The skelp head making method of any one of Claims 8-12 characterized by the above-mentioned.   The upper roll of the forming roll is provided so as to be movable up and down with respect to the housing. When the skelp is raised along with the rise of the upper roll after the bending of the skelp tip by the forming roll is finished, A skelp is brought into contact with a lifting prevention member provided so as to be fixed to the housing at a position lower than the rising position of the upper roll above the plate passage, and the upper roll is further lifted to thereby reduce the skelp. The skelp head making method according to any one of claims 8 to 13, wherein the method is separated from the upper roll. A forged pipe manufacturing facility that manufactures forged pipes from skelp,
A skelp head making device that makes the head of the skelp tip,
A heating furnace that heats the skelp with its head made at the tip,
A skelp heated in a heating furnace is formed into a tubular shape and equipped with a molding / forging machine that forges the ends of the skelp.
The skelp head making device has a structure according to any one of claims 1 to 7, forged pipe manufacturing equipment. A forged pipe manufacturing method for manufacturing a forged pipe from a skelp,
Making the head of the skelp tip,
Next, heating the skelp with the head made at the tip by a heating furnace,
Thereafter, forming the skelp heated in the heating furnace into a tubular shape, and forging the end portion to produce a forged welded tube,
The forged pipe manufacturing method according to any one of claims 8 to 14, wherein the head of the skelp tip is made by the method according to any one of claims 8 to 14.

Images