CROSS REFERENCE TO RELATED APPLICATIONS This application is based on Japanese Patent Application No. 2017-136551, filed in Japanese on July 12, 2017, and claims priority, the contents of which are incorporated herein. [0002] 　The present invention relates to a method of manufacturing the H-shape steel slab like a rectangular cross-section as a material. BACKGROUND [0003] 　In the production of H-beams is shaped into coarse profile (the rolled material of so-called dog-bone shape) material slab or bloom like extracted from the heating furnace by the rough rolling mill (BD). Subsequently, reduction of thickness of the web and the flanges of the crude shaped product by the intermediate universal rolling mill. In addition, the training and shaping of the width reduction and the end face relative to the flange of the material to be rolled by the edger rolling mill close to the intermediate universal rolling mill is performed. Then, H-shaped steel product by finishing universal rolling machine is shaped. [0004] 　In recent years, with the use of the larger and marine structures of the building structure, the manufacture of large-sized H-shaped steel products than conventional is demanded. In particular, the product is desired with increased flange width and flange thickness. In the manufacturing process using a rectangular cross-section material such as a slab, as a technique to increase the flange width and flange thickness, by forming the interrupt at the upper and lower surfaces of the rolled material (slab end surface) pushing the interrupt technique (so-called wedge technique )It has been known. [0005] 　Of these, there are increasing thickness Techniques for flange thickness, for example, in Patent Document 1, to form an interrupt without restraining the upper and lower ends of the material to be rolled (slab end surface), press the interrupt by performing edging rolling spreading technique is disclosed. According to this technique, it is possible to achieve a flange thickness increasing in accordance with the reduction ratio of the edging rolling. [0006] 　Further, for example, Patent Document 2 discloses a technique for performing edging rolling both sides by the addition of pressure while restraining push the interruption of the upper and lower ends of the rolled material (slab end surface). According to this technique, because a reduction by constraining the lower end sides on the material to be rolled, it is possible to achieve resulting let thickening the reservoir wall to the flange tip. CITATION Patent Document [0007] Patent Document 1: Laid-Open Publication No. 11-347601 Patent Document 2: Japanese Patent Publication No. 7-88501 Summary of the Invention Problems that the Invention is to Solve [0008] 　However, for example, as disclosed in Patent Document 1, without restraining the upper and lower ends of the material to be rolled (slab end surface), in the case of performing rolling as a free spread, although the flange width is increased, the thickness of the flange a shape like the tip portion is tapered, the thickness of the flange tip is insufficient. As a result, can not sufficiently formed in a subsequent process, a large increase thickness is concerned that not achieved. Further, according to the study of the present inventors, even when the lower bound of the left and right upper and lower ends of the material to be rolled compared to the conventional (slab end surface), insufficient thickness becomes similar to the flange tip tapered findings have been obtained, such as to become. [0009] 　Also, as disclosed in the patent document 2, when performing edging rolling and restraining both sides of the upper and lower ends of the rolled material (slab end surface), fully spread the left and right flange portions in the grooved edging rolling is conducted in a constrained state. Therefore, it is stretched is dominant in the longitudinal direction of the material being rolled, low-increasing thickness efficiency of the flange portion, there is a limit in increasing the thickness of the flange. For example, even when carried out in the proper caliber conditions, it rolled such that the average value of the thickness of the flange tip portion to the root becomes 1/2 or more of the material slab thickness can not be performed in this technology. 　That is, in the conventional manufacturing technique represented by a wedge method, also insufficient flange thickness cases, large H-shaped steel product as compared with the prior art may not be realized. [0010] 　In view of the above circumstances, an object of the present invention, the caliber of the rough rolling step using in the production of H-beams, the deep interruption in projections that an acute tip shape the material end face of such slabs were placed, in performing steps such sequentially bending a flange portion formed by it, it is that is possible to produce a thick H-section steel products of the flange thickness than conventional to provide a method of manufacturing H-shaped steel as possible. [0011] 　In addition, a problem in manufacturing a flange thickness thicker H-shaped steel products, to inhibit sliding down flaw that may occur on the flange outer side, and, it is possible to improve the biting property at the time of rolling shaping It is to provide a method of manufacturing such H-shaped steel. Means for Solving the Problems [0012] 　To achieve the above object, the rough rolling step, an intermediate rolling step, the manufacturing method of the H-shaped steel having a finish rolling step, the rolling mill to perform the rough rolling step, a plurality of shaping the material to be rolled grooved is engraved, the plurality of holes type, one or more of the protrusions to form the cleavage site in the material to be rolled end put vertically interrupt to the width direction of the material to be rolled is formed interrupt caliber abutting said interrupt comprises a plurality of folding grooved the protrusions are formed sequentially bending the formed separation portion in the interrupt caliber, the last interrupt hole of said interrupt caliber a projection formed on the mold is composed of a base portion, having a distal end portion of the tapered, the gently sloping tapered compared to the distal portion located in the root of the tip having a predetermined tip angle wherein the, the H-beam Granulation method is provided. [0013] 　Taper angle of the base portion is 60 ° or more, and, of the folding caliber may be less than or equal to the tip angle of the projections formed on the forefront of the caliber. [0014] 　Flange thickness of the rolled material to be shaped in the forefront of the caliber of the folding caliber may be 160mm greater. [0015] 　If the flange thickness of the rolled material to be shaped in the forefront of the caliber of the folding caliber is not less than 180 mm, of the base portion with respect to the flange contact width B in the final interrupt caliber of the interrupt caliber as the contact width ratio L / B is the ratio of the width L is 0.20 or more, the front end portion and the base portion may be configured. [0016] 　Wherein when molding in the interrupt grooved and the folding caliber may be pressure in a state where the end face and the grooved peripheral surface of the rolled material are in contact at the shaping of at least one or more paths is performed. [0017] 　Wherein the interrupt caliber abuts the left and right side surfaces of the rolled material, grooved side to restrain the material to be rolled from the right and left may be provided. The invention's effect [0018] 　According to the present invention, the caliber of the rough rolling step using in the production of H-beams, deep interrupts placed in protrusion in which the sharp tip shape the material end surface of such slab, which is formed by it in performing steps such successively bending the flange portion, it is possible to produce a thick H-section steel products of the flange thickness than conventional. In addition, a problem in manufacturing a flange thickness thicker H-shaped steel products, to inhibit sliding down flaw that may occur on the flange outer side, and, it is possible to improve the biting property at the time of rolling shaping to become. BRIEF DESCRIPTION OF THE DRAWINGS [0019] FIG. 1 is a schematic illustration of a production line of H-shaped steel. FIG. 2 is a schematic illustration of a first caliber. 3 is a schematic illustration of a 2-1 caliber. 4 is a schematic illustration of a 2-2 caliber. 5 is a schematic illustration of a third grooved. 6 is a schematic explanatory view of a fourth grooved. Is a schematic illustration of FIG. 7 fifth grooved (flat shaped grooved). 8 is an analysis diagram showing a finished shape of the first pass of a shaped bending in the third grooved. 9 is a schematic explanatory diagram relating to the protrusion shape after improvement. Is a graph showing FIG. 10 the relationship between the flange width flange thickness of numbers when changing the wedge angle Shita1b. 11 is a schematic illustration of a 2-2 grooved K2-2b according to a modification of the present invention. Is a graph showing the vertical sliding speed between the FIG. 12 rolls and the material to be rolled. [13] Comparative Example, Example 1 is a schematic diagram showing a deformation simulation results by FEM analysis in the conditions of Example 2. DESCRIPTION OF THE INVENTION [0020] 　It will be described below with reference to the drawings, embodiments of the present invention. In the specification and drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures. [0021] 　Figure 1 is an explanatory view of the manufacturing line T of H-beam comprising rolling equipment 1 according to this embodiment. As shown in FIG. 1, the production line T in order from the upstream side, the heating furnace 2, the sizing mill 3, the roughing mill 4, the intermediate universal rolling mill 5, finishing universal rolling mill 8 are arranged. Further, edger rolling mill 9 is provided near the intermediate universal rolling mill 5. In the following, the steel in the manufacturing line T for explanation, collectively described as "the rolled material A", sometimes illustrated with the shape dashed-hatched, or the like as appropriate in each figure. [0022] 　As shown in FIG. 1, the production line T, the rolled material A, for example, a slab 11 like extracted from the heating furnace 2 is rough rolled in the sizing mill 3 and roughing mill 4. Then, the intermediate rolling in the intermediate universal rolling mill 5. At the time of intermediate rolling, rolling is performed on the end portion or the like of the material to be rolled (flange portion 80 to be described later) by the edger rolling mill 9 as needed. In the usual case, sizing mill 3 and rolls roughing mill 4, a total of four to six approximately grooved are engraved, H-shaped crude form via these in reverse rolling of about several paths Material 13 is shaped. Further, by using a rolling mill train comprising two rolling mill of the intermediate universal rolling mill 5 edger rolling mill 9 to the H-shaped coarse profiles 13, reduction of the multiple paths are added, the intermediate member 14 is shaped that. The intermediate member 14 is finish rolled to a product shape in the finish universal rolling mill 8, H-shaped steel product 16 is produced. [0023] 　Next, will be described with reference to the drawings grooved structure or pore shape which is inscribed in the sizing mill 3 and roughing mill 4 shown in Figure 1 below. 2 to 7 are schematic illustration of the grooved which is engraved on the sizing mill 3 and roughing mill 4 for rough rolling step. Here, the first hole-type to fourth grooved described, for example may be all engraved in the sizing mill 3, the first grooved to fifth hole type sizing mill 3 and roughing mill 4 5 hole type may be carved separately. That is, the first hole-type to fourth grooved may be engraved over both the sizing mill 3 and roughing mill 4, it may be engraved on one of the rolling mill. The rough rolling step in the normal production of H-beams, are shaped in one or more paths in each of these grooved performed. [0024] 　As it will be explained as an example the case where the basic structure of the hole-type in this embodiment is engraved is 6 caliber, that for even the caliber number, not necessarily 6 caliber, 6 or more may be a plurality of grooved number. That may be a suitable caliber configuration for shaping the H-shaped coarse profiles 13. Note that shown in FIGS. 2 to 7, a schematic final pass shape of the rolled material A during molding in the grooved by a broken line. [0025] 　Figure 2 is a schematic illustration of a first caliber K1. The first caliber K1 is engraved on the grooved roll 20 and the lower grooved roll 21 are a pair of horizontal rolls. The rolled material A is pressure-molded in a roll gap of over grooved roll 20 and the lower grooved roll 21. Further, the peripheral surface of the upper grooved roll 20 (i.e., the upper surface of the first hole-type K1), the protrusion 25 which protrudes toward the inside caliber is formed. Further, the peripheral surface of the lower grooved roll 21 (i.e., the bottom surface of the first hole-type K1), the projections 26 projecting toward the inside caliber is formed. These projections 25 and 26 has a tapered shape, the dimensions of the projecting length and the like are configured equal to each other between the protrusion 25 and the protrusion 26. The height of the protrusions 25 and 26 (projecting length) and h1, the tip angle and .theta.1a. [0026] 　In the first grooved K1, projections 25 and 26 is pressed against the upper and lower ends of the rolled material A (slab end surface), the interrupt 28, 29 are formed. The first caliber K1 is also called "grooved hole type" because it is grooved to impart grooves (interrupt 28, 29) to the slab edge. Here, (also wedge angle is referred) tip angle of the projections 25 and 26 .theta.1a is desirably 40 ° or less e.g. 25 ° or more. [0027] 　Here, the caliber width of the first hole-type K1, the thickness of the material to be rolled A (i.e., the slab thickness) is preferably approximately equal to. Specifically, the width of the caliber at the tip of the projecting portions 25 and 26 formed in the first hole-type K1, by the slab thickness in the same, suitably secured lateral centering of the rolled material A It is. Further, with the construction of such caliber dimensions, as shown in FIG. 2, when molding in the first hole-type K1, at upper and lower ends of the material to be rolled A (slab end surface), the protrusion 25, 26 and a portion of the grooved side (side wall) is in contact with the rolled material a, with respect to the slab on the lower end portion which is divided into four elements by the interrupt 29 (site), the first hole-type it is preferable that positive pressure is not performed at K1 of the top and bottom. This is because pressure by the top and bottom surfaces of the grooved is thus degrading the production efficiency will be caused to extend in the longitudinal direction of the rolled material A, the flange (flange portion 80 to be described later). That is, in the first hole-type K1, reduction in the protrusions 25 and 26 when the projections 25 and 26 is pressed against the upper and lower ends of the rolled material A (slab end surface), the interrupt 28, 29 are formed the amount (wedge tip draft amount), amount of reduction in the slab on the lower end portion is sufficiently larger than (the slab end surface reduction rate), thereby interrupt 28, 29 are formed. [0028] 　Figure 3 is a schematic illustration of a 2-1 caliber K2-1. 2-1 caliber K2-1 is engraved on grooved roll 30 and the lower grooved roll 31 on a pair of horizontal rolls. Circumferential surface of the upper grooved roll 30 (i.e., the upper surface of the 2-1 caliber K2-1), the projections 35 projecting toward the inside caliber is formed. Further, the peripheral surface of the lower grooved roll 31 (i.e., the bottom surface of the 2-1 caliber K2-1), the projecting portion 36 projecting toward the inside caliber is formed. These projections 35 and 36 has a tapered shape, the dimensions of the projecting length and the like are configured equal to each other between the protrusion 35 and the protrusion 36. These tip angle of the projections 35, 36 is preferably a wedge angle θ1b of 40 ° or less 25 ° or more. [0029] 　Here, the wedge angle θ1a of the first hole-type K1 secures the tip thickness of the flange corresponding portion to increase the inductive, in order to secure the stability of rolling, 2-1 caliber of the subsequent stage K2 it is preferably the same angle as -1 wedge angle Shita1b. [0030] 　Height (projecting length) h2a of projections 35 and 36, the is configured higher than the height h1 of the protruding portions 25 and 26 of the first hole-type K1, it has a h2a> h1. In the these upper grooved roll 30 roll gap of the lower grooved roll 31, the material to be rolled A after the first hole-type K1 mails material is further shaped. [0031] 　Here, than the height h1 of the protruding portions 25 and 26 formed in the first hole-type K1, the higher the height h2a protrusions 35, 36 formed on the 2-1 caliber K2-1. Further, towards the upper and lower ends penetration length in the (slab end surface) likewise 2-1 caliber K2-1 of the rolled material A becomes longer. The rolled material penetration depth into A of the protruding portions 35 and 36 at the 2-1 grooved K2-1 is the same as the height h2a of the protrusions 35, 36. That is, the penetration depth h1 'to the rolled material A of the protruding portions 25, 26 of the first grooved K1, to the rolled material A of the protruding portions 35 and 36 at the 2-1 grooved K2-1 the penetration depth h2a have a relationship between h1 ' h2a . In these upper roll gap of grooved roll 40 and the lower grooved roll 41, the material to be rolled A after 2-1 grooved K2-1 mails material is further shaped. [0036] 　Here, than the height h2a protrusions 35, 36 formed on the 2-1 caliber K2-1, height h2b of the protrusions 45 and 46 formed on the 2-2 grooved K2-2 it is high. Further, towards the upper and lower ends penetration length in the (slab end surface) likewise 2-2 caliber K2-2 of the rolled material A becomes longer. The rolled material penetration depth into A of the protruding portions 45 and 46 in the first 2-2 grooved K2-2 is the same as the height h2b of the protrusions 45 and 46. That is, the penetration depth h2a to the rolled material A of the protruding portions 35 and 36 at the 2-1 grooved K2-1, the rolled protrusions 45 and 46 in the first 2-2 grooved K2-2 penetration depth h2b to wood a is in the relationship between h2a