SA516371950B1 - Bending-press forming punch - Google Patents

Abstract

Disclosed is a bending-press forming punch which is hardly affected by the bending moment and can obtain a cylinder with good roundness. [SOLUTION] Provided is a bending-press forming punch which includes a pair of left and right dies 1 that are disposed at intervals along a widthwise direction of a plate material S to support the plate material S at two locations; and a punch 2 that is movable in a direction of getting close to or away from the dies 1 and sequentially presses the plate material S in the widthwise direction while interposing the plate material together with the dies 1 to perform the bending, wherein the punch 2 includes a punch head 2a having a working surface K which comes into direct contact with the plate material S to press the plate material S into a concave shape, and a punch supporter which is held by connection to the punch head 2a to support the punch head 2a. Moreover, the punch head 2a has a working surface K having a working surface center O which match

Description

BENDING-PRESS FORMING PUNCH Full description

Invention background

The present invention relates to a forming punch with a bending-press.

be suitable for production; efficiently thick steel pipe of large diameter, for example

example; It is used for line pipe dasha or ails by pressing and bending; respectively; material

plate material along its feed direction through a three-point press

.bending-press

As a technology to produce a thick steel tube with a large diameter used for line pipe or the like is used

Widely used so-called UE 100 forging technology for stamping treatment of steel plate

Plate with predetermined length, width and thickness of the plate by pressing U-shaped forming of the 0 steel plate by collecting the end ends of it with 0-shaped butt-joining by welding to form

An esteel pipe with a larger diameter expansion (Lo) is called tube expansion.

to improve roundness.

However; In the UOE modulation technology mentioned above. High compression pressure is required

The process of forming the steel plate in the shape of letter 17 and the shape of the letter O by pressing 5 the steel plate; So that they have no choice but to use a wide extrusion machine

.Large-scale press machine

For this reason; Studies have been conducted on the technology to reduce the pressing pressure in the production of this type

steel pipes

As a precursor to this canal, a press bending technique has been put into practice, which in advance performs bending (flange bending) of the end sections in the direction of the width of the steel plate; And then form

The steel plate is greatly rounded by a three-point bending press procedure a number of times

ed and mold the shape further to form a fulani pipe.

Figure 9 Ble is of a view showing an embodiment of such a press-bending forging. Reference number 1 in Fig. 9 refers to a die placed within the transport path of the S plate material. Die 101 comprises a pair of left and right rod-shaped members 101 and 101b that support the sale of plate 8 at two points along the direction of Transport » and a distance p between the two members in the form of the left and right rod can be changed according to the size of the steel tube to be formed. However; In the course of producing an open tube by forging of sheet material 5; The distance ve is not changed. The punch 102 is movable in a direction approaching and moving away from die 101. The punch 2 includes a punch head 1102 that has a convex working surface dallas (forming) Jind. 16 which comes into direct contact with the plate material 5 to compress the plate material 5 in a concave shape; 0 and the punch supporter 102b that leads behind the punch head 1102 and supports the bale head 2. The maximum width of the punch head 1102 is equal to the width (thickness) of the punch head 2b. Also, a rotating cylinder 103 forms a conveying path for the sheet material 5. In a bending process applied with a three-point press brake, it is common practice to determine empirically the number of bends and a broach to be used (in particular, its shape); Taking into account the load and the shape of the product during bending 5 (for example, the processing width of the clamp is about 120 mm; the number of times of bending is about 50 to 60). in the flexion method; It is difficult to implement effective production as the number of bending times increases. As a countermeasure to this problem, for example, the patent document 1 discloses a method whereby the forming by pressing of a steel plate in the transverse direction is effected by bending both end sections and a specified intermediate section 0 in the transverse direction of the steel plate so that each of the straight sections of desired length remains and a section is Between the straight sections is a circular arc section; synchronously welding a joint section to form a round shaped steel tube dang Lida heating the entire round shaped steel tube partially; Executing hot forming throughout the number of forming cylinders in which the shape of its forming surface is semi-circular in accordance with the final radius, in order to modify 5 shapes in this way.

However; According to the patent document disclosure 1; A molded body after forging has a shape close to ae and it is necessary to provide separately a process (on hot) to correct the shape; So that there is a problem of causing a significant increase in the cost of production when the consumption of thermal energy applied to heating is involved. Also in this method; When you use a plate material produced by a thermo-mechanical heat-treatment process on Ll original plate to combine strength, toughness and weldability, there is a risk of degradation of its properties. at the same time; PATENT document 2 discloses a method to reduce the number of bends in a three-point press press while minimizing the stress acting on a connection section between the punch head and bending plate 0 supporting the punch head (compatible with the punch rest). According to the patent document 2 as long as the machining width of the auger head is wider than the width of the bending plate; It is possible to reduce the number of bending times in the three-point press brake compared to the case of the tap head as shown in Figure 9. Moreover; As long as the auger head is rotated with the bending plate; A small bending moment caused by rotational friction gia acts on the bending plate; And therefore; 5 There is an advantage in that the load applied to the equipment is reduced. However; As long as the swivel supporting section has a width smaller than that of the bending plate; There is a concern that too much surface pressure acting on the bearing will cause the bearing section to wear and deform; There is a possibility that circulatory function could not be preserved at an early stage. Patent Documents 0 and Patent Document 1: Japanese Patent No. A-324255-2005 Publications Patent 2: Japanese Patent No. A-82219-2004. General description of the invention as set out above; in traditional techniques; It is not easy to simply widen the machining width of the press head in press brake forming; In order to prevent excessive load being applied to the 5 section of the connection between the auger head and the auger rest while extending the machining width of the auger head; It is useful to increase the width (thickness) of the auger post sufficiently.

However, from the point of view of improving the precision in the process after press brake forming in recent years; It is required to reduce the width (thickness) of the auger support of the auger used in forming with a bending press. Lads In the case of forming the sale sheet in a cylindrical shape by forming with a bending press to make a tubular body ctubular body until Oly the body 1 of the tubular was removed along a longitudinal direction when the tubular body is extracted as a material to be formed from the abrasive cpunch It is not theoretically possible to provide a gap between the end sections of the width of the plate facing each other in a tubular body whose width is smaller than the width (thickness) of the bolt rest. In a tubular body (hereinafter also referred to as Jil) this tube is an open pipe in 0 form having a recess in which the plate ale is formed into a cylindrical shape and the end sections of the width of the plate facing each other are not welded; and when welded the end sections of the width of the sheet facing each other (hereinafter such a position is also referred to as a seam section)”; it is necessary to deform the tubular body by applying a force from the outside of the tubular body and to eliminate the gap by means of reciprocal buttocking of the end ends The width of the plate facing each other is 5. (Lag) in press-bending forming, where the gap between the end sections of the width of the plate is small; the force required to butt the end sections of the width of the plate with each other is small; and it is also difficult to cause bad shape such as roundness depression. method; there has been an increasing demand for a technique to stop increasing the width (thickness) of the punch rest as much as possible while widening the machining (forming) width of the hammer head in press bending. Efficiently bending” without causing wear and tear to the fastener or without degrading the quality of the product; In the production of steel tube from sheet material by three-point press brake. The present invention provides a press press press press comprising dies placed at spacers along the feed direction of sheet material to support the sheet material in two places; and a movable auger in the direction of approaching or moving away from the dies and successively presses the sheet material supported by the dies along the feeding direction to perform bending where the auger has an auger head that contacts Bile with the sheet material to compress a material

plate»; And the back of the bow that is held by its attachment to the back of the head of the bow and supports the head of the bow; The auger head is provided with a processing surface that has a processing surface center that coincides with the axis of the auger rest and is formed by a non-uniform circular arc with a radius in a central area in the transverse direction as a maximum radius. In a press bending press it has the form shown above; It is preferable as a specific method Jal the problems of the present invention that: 1) An irregular circular arc includes a continuous circular arc or a discontinued circular arc; 2) When the irregular circular arc includes the continuous circular arc 0 or the discontinuous circular arc, the continuous circular arc and the discontinuous circular arc consist of an arc A main circular arc with a radius corresponding to the inner diameter of the cylindrical body to be processed and equivalent processing widths laterally (seam length) relative to the surface center of the processing surface “00:100” and a secondary circular arc that connects to a width edge of the main circular arc and has a radius smaller than the radius 5 4 Among the irregular circular arc, the circular arc that mainly contributes to bending has a processing width less than 0.90 times the feeding step of the sheet material; and 5) the continuous circular arc and the interrupted circular arc; the main circular arc has a processing width less than 0.90 times the feeding step Sheet material According to the press-bending auger according to the invention having the form shown above, the auger head 0 is provided with a processing surface having a center A processing surface that corresponds to the axis of the auger support and is formed by an irregular circular arc with a radius in a central area in the transverse direction as the max radius. And so on; Even if the flexural area of the sheet material increases; The viewing end of the processing surface is not in strong contact with the plate material; It is possible to prevent excessive bending moment which may cause deformation or damage to the bolt. dil) to cell as long as plate materials whose width is wider than 5 that of the traditional technique can be bent into a single oy; A steel tube with a good roundness can be obtained with only a few bending times. Furthermore it; The process such as heating the plate material is not

yg pun Thus it is possible to maintain the characteristics Jie strength, toughness, weldability or the like obtained in the production process of the sheet material (original sheet). Ble on that; According to the press bending machine according to the invention; An irregular circular arc is a continuous circular arc or a discontinuous circular arc obtained by combining at least two arcs of different radii so that the width end of the machining surface of the auger head does not come into forceful contact with the sheet material at the time of bending. And therefore; It is possible to avoid excessive bending moment causing deformation and damage to the bolt. as well; It is relatively easy to form a processing surface. According to the forming force of the press brake, it has the above-mentioned shape; The machining surface of the auger head can be easily shaped by making an irregular circular arc into a bypass. 0 furthermore; According to the press bending machine according to the invention; Continuous circular arc and interrupted circular arc consist of a main circular arc having a radius corresponding to the inner hb of the steel tube to be machined and machining widths laterally equivalent with respect to the center of the machining surface; A secondary circular arc connected to a width edge of the main circular arc and has a radius smaller than the radius of the main circular arc. Thus, it is possible to reduce the unbalance of the forces acting on the bolt 5 by decreasing the difference in the distances from the starting point of contact between the plate material and the bolt head to the center of the dal head through the unformed side and the formed side section (salad) the plate; This avoids heavy load applied to the contact section between the auger head and the auger rest while ensuring a wide processing width of the auger head. La of the forming auger with a bending press according to the present invention has the aforementioned form Del in the 0 surface of the process formed with an irregular circular arc; The processing width of the circular arc forming area Led mainly contributes to the bending is set to less than 0.90 times the feeding step of the sheet material; Thus, no excessive bending moment occurs in the bolt. accordingly; Bolt life is extended to enable consistent bending over a long period of time; the roundness of the steel tube can be improved. In particular; When the irregular circular arc is a continuous circular arc or a discontinuous circular arc 5; The continuous circular arc or interrupted circular arc consists of the main circular arc and the secondary circular arc; As long as the main circular arc contributes mainly to flexion; it

Excess bending moment can be prevented by setting the machining width of the formed area of the main circular arc to be less than 0.90 times the feeding step of the sheet material. BRIEF EXPLANATION OF THE DRAWINGS FIGURE 1 is from a schematic view illustrating an embodiment of a press press bending press according to the invention

Present.

FIGURE 2 is a schematic view showing a deformed Alla of sheet material when it is pressed with the press brake press shown in FIG. 1. Figures 3() to 3(c) are schematic views showing an embodiment of HAT with the press brake press shown in Fig. 1.

0 Figure 4 is a schematic view showing a method for bending using press-bending forming. Figure 5 is a schematic view showing the deformation of the sheet material when forming with a press brake using a regular circular arc head. Figure 6 is a schematic illustration of the ni-shape processing that contributes to the bending of the broach. Figure 7 is a schematic view showing a specific dimension for the auger head used in the example.

5 Fig. 8(a) is a schematic view showing a dial gauge can used when evaluating in situ roundness of a steel pipe; and Fig. 8(b) is a schematic view showing how to measure intial roundness. Fig. 9 is a view Schematic showing an example of the embodiment when forming a press bender according to the conventional method.

0 Detailed Description: The present invention will be described more specifically in the following, with reference to the accompanying drawings. Fig. 1 is a schematic view showing an embodiment of a press bending press of the present invention. In the diagrams » Die 1 is placed within a conveying pathway of sheet material 5. Includes

5 die 1 on a pair of left and right bar-shaped members QL TT which support sheet material 5 at two places along the feed direction; Its distance can be changed according to the size of the tube

Fulani to be formed. However; In the course of producing a single open tube by extrusion of a material

plate 5; The distance ve does not change

(US) The screwdriver 2 is moving in a direction approaching and moving away from mold 1. The screwdriver 2 includes a head

Bolt 12 has a convex downward machining surface K directly contacting the sheet material 8 for pressing the sheet material into a concave shape and resting wrench 2b leading to the back of the wrench head 12 and supporting the wrench head

2. Likewise, 3 rotating cylinders form the salad JEL track on plate 5.

The drawing does not show a specific structure of the bracket 2b of the bracket 2; Only the upper limb section connects

By means of pushing Jie, a hydraulic cylinder, by applying the pressing force on the

Ras Al-Barama 2 by means of payment “driving means”.

0 The width (thickness) of the bolt support 2b shall be appropriately designed according to the thickness and strength of the sheet material 5 as the material to be formed and the shape of the tubular body to be formed. as well; Insofar as the bolt backing 2b may be in contact with the end section of the sheet material 8; A replaceable wearing plate can be provided on the surface of the auger rest 2b. A wearing plate is preferred as long as it can be used for a long period of time without bearing wear

5 Al-Barama 2B by replacing it appropriately. Moreover; As the main sections are shown in Figure 2, the auger head 12 of the auger 2 has a processing surface center 0 that corresponds to the axis » of the auger support 2b; An available K processing surface is shaped at its head with an irregular circular arc having a radius of “maximum radius” in the central region in the transverse direction (other regions have a radius “less than half

0 diameter (rn) and here the irregular circular arc defined in the present invention refers to a circular arc provided by an amalgamation as shown in Figures 3( ) to 3(c) in which at least two arcs of different radii are combined fused together” i.e. a circular arc comprising a circular arc of radius ry placed at the center of the processing surface © (this circular arc is called Lad following

5 a major circular arc (Ki) and a circular arc of radius " smaller than that of the main arc Ki (hereinafter called a secondary arc (Ka) in Figures 3(a) to 3(c); the )(

is a circular arc having a common tangent at the point of contact between the major circular arc Ki and the minor circular arc Kop (when the angle formed by the major circular arc tangent Ki and the minor circular arc tangent Ko is 0 degrees)”; (b) is a circular arc in which the major circular arc tangent, Ki, and the secondary circular arc tangent, Ko, join each other while forming an angle (the angle is not 0 320) and (c) is a circular arc in which the angle formed by the major circular arc tangent 11 The secondary circular arc tangent, Ko, is zero degrees but they are connected to each other by step d. Hereafter, the circular arc tangent as shown in (a) will be referred to as a continuous circular arc (jail) on circular arc (Cate Jie bypass or similar; the radius gradually changes with a common tangent); A circular arc as shown 0 in (b) and (c) will be referred to as a discontinuous arc. A discontinued circular arc also includes a circular arc in which the radius of the circular arc gradually changes. As shown dled, the bolt 2 is basically formed to include the head of the bolt 2 and the bolt support 2b; However, it is possible to insert a spacer (not shown in the figure) between the bolt head 12 and the bolt support 2b. By inserting the separator there between them, for example; When the mounting angle of the auger head 5 2 is precisely adjusted to the auger stand 2b; The mounting angle can be adjusted to a suitable angle only by adjusting the shape of the spacer instead of the bolt bracket 2b itself. And also; When the punch head 2 is divided in the longitudinal direction of die 1, it is possible to improve processing efficiency when storing the punch heads 12 or when installing the punch heads 2 in the punch stand 2b by holding a group of split punch heads 2 with one spacer. As long as there are features as shown above; It is preferable to insert a spacer (other than 0 shown in the figure) between the bolt head 12 and the bolt support 2b. and to carry out the sale bending of sheet 5 by means of a press brake using a daly having the form shown above; sheet material 5 is placed on die 1; In such a manner as shown in Figure 4; Sheet material 5 may be successively subjected to three-point bending on both the left and right sides of the edge in the transverse direction toward the center by the ram 2 with intermittently feeding sale sheet 58 5 with a predetermined feeding step. Bla) further; Fig. 4 gle is a schematic view showing the process of forming an open tube as shown in the right view (SN); By performing the sale flexion of the plate

which have been subjected to edge bending (described below) in advance; from top to bottom left column then; from top to bottom of the central column; as well as from top to bottom of the right column; and by carrying out the feeding of the lamella material 5. in Figure 4; The open arrows assigned to the sheet material 5 or bolt 2 indicate the directions of movement of the sheet material 8 or bolt 2 in each operation.

5 when bending of sheet material 5 is carried out in the above manner (during pressing); Sheet material 5 contacts die 1 in a state of All; The material of plate 5 is deformed in the case of left-right asymmetry with respect to the center of the machining surface 0 of the auger head 2. Lovie The bending process of sale of plate 8 progresses gradually in this case; In order to maintain the state of contact between the screws 2 and the dies 1; The sale sheet 8 leans too much on the unformed side

Yao 0 from the center (O working surface center) in the transverse direction of the auger head 12 (the angle of curvature of the salad plate 5 increases with respect to the auger); as shown in Figure 5; the contact field (bending field) in which the head of the rivet 2a comes into contact with the plate material 5 becoming wider on the unformed side than on the side Oa so long as the rivet 2 receives the forming reaction force at both ends of the contact field; when there is

5 difference in the distances (La) ma) from the center (center of the machining surface 0) in the transverse direction of the auger head 2 to both ends of the contact field; The bending moment (P =) M bending moment (Ma - (La) acts on the seam section between the auger head 2 and the auger support 2b. In particular dng in three-point bending using the auger head with a processing surface that includes a single circular arc Accordingly, there is concern that the auger head 12 or the auger rest may be deformed or damaged.

0 2 in the press bending machine of the present invention; As long as the machining surface 16 has the asymmetric circular arc and the radius of the secondary circular arc ko is smaller than the radius of the main circular arc 16, as shown in Fig. 2, the asymmetric field can be narrowed compared to a bolt having a single machining surface; And therefore; even when the ale flexion of plate 5 progresses;

5, the load in the area of the supply end of the auger head 12 is not greatly increased; As a consequence (lla) the occurrence of excessive bending moment can be prevented.

In the present invention; In order to obtain a steel pipe with good roundness by press bending forming; The main circular arc, 16, formed on process surface K has equal contact lengths laterally with respect to the center of process surface 0 as starting point. Be aware that “although the major circular arc Ki and the minor circular arc Ka consist of either a continuous circular arc or a discontinued circular arc” the number of circular arcs is not particularly limited. Although the length (circumferential length) of the processing surface 16 is determined by the size of the steel tube to be made and the number of presses; The machining width of the machining surface K in the region shaped with a circular arc which mainly contributes to flexing is preferably less than 0.90 times of 0 of the feed hazard of the sheet material in order to reduce the flexing moment occurring in the 2 punch and reduce the number of presses to achieve effective flexing (when set The machining width of the circular arc shaped area mainly contributes to the bending to my and the ale feeding step of plate 8 is set to 6; the ratio of (03/8) of the machining width is g and the feeding pitch § of the material of sheet 5 is less than 0.90 times ). In the auger head 12 where the machining surface 1 is formed by the main circular diameter, 16 by the secondary circular diameter 5, Ko, the main circular arc, 16, mainly contributes to the bending; So that the machining width of the area formed by the main circular arc,16, is set to less than 0.90 times the feeding step 6 of the sheet material. Then, when a target bending forming amount ;6 (time bending angle) is set around the center of the machining surface 0 on the machining surface K of the bit head 12, the machining width np of the region 0 shaped by the circular arc primarily contributing to the bending denotes A length (length of a circular arc) on the processing surface K corresponding to a range of target flexural formation: 0 as shown in Fig. 6. Also, when flexion times are assumed to be oN as long as the sheet material is flexed In a 360° Liga pipe shape with flanges flexed, the target flexural flexure is: 0 is (360° -2 X flange flexure angle) / 17 is the 5 flexion measure over time.

in Bending Presses using the 2-Anchor of the Present Invention; it Bale the number of flexion times 17 is not less than 3; So that 120° which is the calculated value when the angle of flexure of the edges is assumed to be 0° is sufficient as a target value for the amount of flexure formation over time. Accordingly, the amount of flexion formation on the machining surface K of brace 2 can be set to not exceed 120 degrees (corresponds to no more than 60 deg on one side of the center of machining surface 0 of brace 2); or it may be further decreased to no more than 90° (corresponds to no more than 45° on one side from the center of machining surface 0 of auger 2). in general; when the sheet material is formed into a tubular shape by press bending; Edge bending (also referred to as crimping) is performed on the end sections of the sheet width of the sheet material prior to forming with a press brake. This is implemented in order to ensure a good roundness of the end sections of the sheet width that are relatively difficult to bend compared to the case of performing the bending of the central section of the sheet width in the forming with a press press. Furthermore it; As long as the sheet material has the shape of a tube by performing 360 degree bending Liga with forming by post bending press; in press brake forming; The bending is applied except for the amount given by the bending of the edges. The amount of flexion formation (Ash) 5 : 0 in time in the press brake is (360° -2 * angle of flexion of the edges) / (N and the required field with flexion in time is the amount of feeding (feeding step). OAT The sheet material is formed into a tube by giving the amount of flexure formation :6 each feeding step.At this time, when the sheet material travels along the machining surface K of the auger head 2 the field profile of the amount of flexure formation (central angle) :0 It is moved over the punch head 2 to obtain the shape after pressing the bend 0. Since the length (the circumferential length (or the length of the circular arc)) along the machining surface K of the section of the amount of flexion formation : 0 approaches the feeding hazard of the sheet material, the section given It has a broadening radius of bending, and good roundness can be ensured.However, when the field of co LEV is widened, the receiving position of the bending reaction force becomes far from the center of the curing surface 0 of the curing surface c for the bolt head 2; 5 and there is a problem with the increase in the bending moment at the seam section between the bolt support 2b and the bolt head 12 and in order to limit such a for problems; In the present invention; The width of the treatment «of the problem area

The circular arc mainly contributing to the flexure is set to less than 0.90 times the feeding amount

(length) the material of the plate.

as well; When bending the sheet material 8 with the auger head 2 which has a radius smaller than the radius

the product; The radius of curvature of the curved section of the sheet material 5 also decreases. And in this Aa

A flexural section has a locally smaller radius of curvature than that of the other sections being formed

also in the tubular body made of plate; So that the shape deteriorates if the section remains in

The product is intact. Since the secondary circular arc radius K of the processing surface K is smaller

From the radius of the major circular arc ky it is necessary to pay attention to the occurrence of such

Failure. For this reason; It is preferable to adjust the oll range of the secondary circular arc Ke to no more than 0 15 degrees at the central angle of the secondary circular arc Ko

When the length of the processing surface in contact with the sheet material is shortened; As long as the oath that was not given to him

The curvature (i.e., the flat portion) is increased and there is a risk of deterioration of the roundness; it is preferable

Adjust the processing width (distance): « appropriately to the area where the contributing circular arc is formed

Basically by bending according to the descriptions (strength, thickness, size and shape) of the target product. 5 examples

Nine steel plates (steel type: API grade X80) having dimensions along

feeding direction salad plate 5 is 3713 mm”; Sheet thickness 25.4 CAN and tensile strength 745

to 757 MPa; Edge bending shall be performed so that both end sections of the plate have

The steel is angled by 16.9 degrees over a span of 215 mm by means of a 0-radius bending wrench of 380 mm.

Next, the three-point flexion of JS is performed from both the left and right sides toward a center

Steel plate based on the requirements of 298mm/time feeding step; The amount of flexion

6 degrees/time and five times of snap using a position to one side 1492mm from center

Steel plate (dimension center along the feeding direction) as the bending start point .point 5

Then one three-point bending is performed on the steel plate undergoing three-point bending at the center (11 times of bending in total)” and the buttstock gap of both ends of the steel plate is set to 125 mm; which is welded to form a steel tube with an outer diameter of 1219mm; The research is being conducted on the quality of the obtained steel tube and the working stress on the auger stand to support the auger head. The results are shown in Table 1, together with the results of the case of bending with the bit head 2 equipped with a processing surface with a single circular arc. Here the bending is performed using a template where the head radius is set to 75 mm; And the distance p (the distance between the two centers) between the two rod-shaped members 1a and 1b is set to 550 mm. Lady The auger head with a width of 400 cae is used, and the auger rest with a body section width (thickness) of 0 100 mm and a receiving section with a width of 400 mm is used to fix and hold the auger head at the end in order to support it as shown in Figure 7. A strain gauge is attached to the section The terminal R (starting place (R) has a radius of 0 mm available in the creceiving portion in the contact section between the body section and the receiving section, thus measuring the stress acting on the bolt rest 2b by scale. In addition; the shape of the machining surface is an arc continuously in a circular motion of Table 1 item 5 when bending 5 is performed using a drill head having a machining surface in which the main circular arc and the secondary circular arc join each other at an angle of zero degrees A Se between the main circular arc tangent and the secondary circular arc tangent; at the 15° position from the center of the machining surface 0 of the auger head. indicates half s Draw the main circular arc to the value of the radius at the center of the machining surface O (i.e.; the maximum value of the radius); With reference to the radius of the secondary circular arc to the position far from the center of the machining surface 0 by 1/2 the amount of flexion formation: 0: 29.6 degrees; “(gf) is the minimum value of the radius of the sphere mainly contributing to the bending; respectively. In addition, the shape of the machining surface is a discontinuous circular arc when the bending is performed using the head of a drill having a machining surface in which the main circular arc and the secondary circular arc are connected to each other with a difference 6 degrees for the angles formed between the tangents of the circular arc

The head and the secondary circular arc tangent at positions 15° from the center of the machining surface 0 of the auger head 12 as well as; in the ratio of the working stress on the bolt rest to the fatigue limit stress in Table 1; The stress acting on the bolt rest indicates the largest value in the 11 times of flexion. However; It is required to consider the implementation of the amount of stress acting on the bolt rest in relation to the amount of (alga) fatigue limit. And therefore; Shown in Table 1 are the values obtained by dividing the working stress on the bolt rest by a baseline allowable stress range at 2 X 10 6 stress repetitions based on Fatigue Design Hagane-Kouzou's Fatigue Design Guidelines and Steel Structure Comments. no Hirou Sekkei ) Guideline and Commentary of Steel Structure 3A "Shishin .Dou Kaisetsu) 0 by the Japanese Society of Steel Construction cof Steel Construction regarding the auger post; In the evaluation of the auger head, a condition where the working stress on the auger rest is less than the limit stress (DS) i.e. a condition where the ratio of the working stress on the auger to the fatigue limit stress is less than 5 l denoted by © (excellent); dlls in which the strain ratio is not more than 1.25 are indicated by © (allowed); and a case in which the ratio is more than that value is indicated by * (not permitted). The number of stress repetitions for 1 * 10 is the modulatory value (threshold). status not exceeding the honorific value; As long as the repetitive stress works 10 times on a single pipe (largely symmetrical formation is obtained in the last 0 113 Spall; the stress due to flexure works hardly and does not affect the fatigue life); it can afford to produce 1 x 10 tubes (equivalent to 1219 km in the case of the standard 40 ft length); And there is no practical problem. Ble on that; The evaluation of the steel tube in Table 1 is performed in terms of in situ roundness. Measure the in situ roundness using; For example (JB) a dial gauge (with a dial) 4 having 5 pairs of leg segments 4 and 4b with a distance between the legs 0 as shown in Fig. 8(); Connecting both ends of the lists 4c; 4d for both parts of lists 4a; 4b with the surrounding (outer) surface of the tube

The resulting steel and at the same time a probe connection (not shown in the figure) is provided at the (taper) end of the spindle (tapped) 4e with the surrounding surface of the steel tube; and by reading a radial shift from a hypothetical complete circle as a target shape for the steel tube. This means that the circle gets closer to a full circle the smaller the value. And in this embodiment; It is an evaluation indicator of the shape difference between the section that connects to the head of the punch and the die and the section that does not connect to the head of the punch and the die. Here, a dian with a distance between the two posts 0 by 150 mm is used to measure the in situ roundness as shown in Fig. 8(b) along the circumferential direction of the circumferential (outer) surface of the steel pipe and obtain the maximum value of the measured in situ roundness. Als Led value shall not be more than 2.0 mm tolerance of APT 801-28 as typical steel tube standard 0 indicated by © (excellent); condition where the value shall not exceed 3.2 mm tolerance of APLSL denoted by © (good); and a condition where Led exceeds the value denoted by * (not allowed) in Table 1. [Table 1] Overview ] No | Half | Half | Ratio | Rating | Figure | 275 | Value | Evaluation | Observations Bolt | Diameter | Diameter | Maximum Surface Stress Arc | Arc | Operator for Circular Rotation | Circular | Automatic Positional Main | Secondary | Bolt (mm) (mm) | (To tighten to fatigue limit stress i 0 290 ]087 |© Arch |20(084 © Invention Circular Current Continuous

B 0 350 |1.10 Arch 4 1.9 © The invention continues

z 0 | 400 | 1.25 arc 1.80.84 © Invention continues

3 0 A 417 0.94 0 Curve 8 2.3 The invention

iENE

A 0 433 1.02 Curve 2.00.80 © Invention

a sa a

and 0 [425] 1.25 Curve 1 1.71 © Invention

ass

5 0 340 0.97 0 Arch 4 2.2 The invention is discontinued

.0 0 360 1.02 parenthesis | 2.10.84 The invention is discontinued

1 510 340 [130] The arc 2.1 The circular recess The comparator is interrupted

Yi 480 7 Except for a parenthesis | 231084 Circular comparator is one-way

4 455 1.6 arc A 3.11080 X Cycloidal Comparator Single

J 420 097 © Arch | 351074 x cycloid comparator mono

As can be seen from Table 1; in the numbers (a) to (h) appropriate to the present invention; the

The stress ratio applied to the bracket during flexion does not exceed 1.25” and no deformation or damage is observed.

The brahma. Moreover; The in-situ roundness of the steel tube formed by

Threads (a) to (h) are not more than 2.3 mm and sufficiently meet APT (gl).

standard.

In particular; In a case where the processing surface of the auger head is formed by a circular arc

continuous (Figures a, b, c; e and f); The local roundness of the steel pipe is no more than 2.0mm

It met the stringent 2b standard in the 801 standard, and it was found that high quality 0 steel tubing could obviously be machined without the addition of additional processes.

When continuous circular arc is applied to the machining surface of the auger head; In Albramah No. (a) has half

smaller diameter of the secondary circular arc; The stress ratio in aud is the connecting portion

is the smallest by 0.87; It turns out that these are permanently usable for an auger stand like this.

Conversely” in brame number (i) in which the ratio (ni/S) of the processing width (nj) of the region 5 mainly contributing to the bending and feeding step (5) sald of the plate is 0.90; Even in Ua

Irregular Round Arch » The stress ratio applied to the bolt rest is as large as 1.30;

There is a risk of deformation and damage to the brama.

Ble on that” in the bending process by using rivets that have a rivet head with a circular arc processing surface

mono In the case of applying the number (J) auger that has a processing surface with a radius of 480 coe, the stress ratio applied to the auger support increases, and there is a risk of deformation or damage to the auger. within

that; In the case of applying augers No. (k) and (l) that have a processing surface with a radius of 455 mm; or

0 mm, it is found that there is a tendency to deform the local roundness of the steel tube.

Industrial applicability

According to the present invention; It is possible to provide a press bending press forming auger in which the influence on deformation 5 and the damage of the auger due to the occurrence of excessive bending moment is prevented in order to “steadily and effectively” “JS” the steel pipe

well-rounded over a long period of time.

Description of reference symbols 1” 101 die 1 0101 bar-shaped member 5 cl 101b bar-shaped member 2 102 ram dy, 1102 2 ram 2” 102 ram rest 3 < 103 rotating cylinder 0 4 scale limiter (59 disks) inscribed) 4 list part b list part z4 list end 0 list end 4e spindle 5 plate material e distance Ki main circular arc Ks secondary circular arc rn 0 radius 12 radius 0 center of the machining surface q axis of the press. 5 Relay list di the formed side

"B" construction area ne” unformed side ny direction of feeding sheet material “U” M=P(L1-L2)

And "pipe extension" yr welding M=P(L3-L4) "si" 100 mm "j" 400 mm

"k" the local roundness "l" is 0 mm and the default full circle is "the target shape of the steel pipe" ls "ni"

Claims (1)

Daly protection elements 1. Forming a forming punch with a bending-press, including: dies placed at intervals along the plate material feeding direction to support the plate dies for approaching or moving away from the molds or moveable in the punch daly at two places; It is distinguished by the fact that the punch has a punch head, which contacts By Sle with the plate material to press the plate material, and a punch supporter that connects to the back of the aig “punch head.” Punch head ig punch head The punch head is provided with a working surface that has a working surface center dallas working surface center 0 that corresponds to the axis of the punch supporter and is formed by a circular arc non-uniform circular arc in which the radius in a central region in the transverse direction is a maximum radius and is set at 120° or less as a -bending angle 2. Forming punch with a bending-press according to Claim 1, where the non-uniform circular arc is a continuous circular arc or a discontinuous circular arc. obtained by adding at least two arcs of different radii. 3. forming punch Jill daly with a bending-press according to claim 1 where 0 includes a non-uniform circular arc involute All .curve forming punch Jill daly 4 with a bending-press according to claim 2 where Ja continuous circular arc ai wall or discontinuous circular arc 25 on main circular arc circular arc has a radius corresponding to The inner diameter of a steel pipe to be manufactured that has identical processing (forming) widths laterally with respect to the working surface center and a sub circular arc that leads to a width edge of the main circular arc and has a radius smaller than the radius. 5. 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