JP2009078342A - Upper blade for down-cut crop shear - Google Patents

Upper blade for down-cut crop shear Download PDF

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JP2009078342A
JP2009078342A JP2007251489A JP2007251489A JP2009078342A JP 2009078342 A JP2009078342 A JP 2009078342A JP 2007251489 A JP2007251489 A JP 2007251489A JP 2007251489 A JP2007251489 A JP 2007251489A JP 2009078342 A JP2009078342 A JP 2009078342A
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blade
rake angle
straight
cutting
maximum
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JP5088069B2 (en
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Hiromasa Hayashi
宏優 林
Keitoku Yuge
佳徳 弓削
Yukio Fujii
幸生 藤井
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper blade capable of increasing the cutting performance of an existing down-cut crop shear and easily manufacturable and also provide a method of manufacturing the upper blade. <P>SOLUTION: To increase the cutting performance, the rake angle of the blade which bites in a material at the beginning of cutting is set larger than the rake angle of the blade which starts to bite in the material after a peak load occurs. The rake angle of the edge of the upper blade in an area used at the beginning of cutting is increased. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ダウンカット式クロップシャーの上刃に関し、特に切断能力に優れ、高強度鋼の切断に好適なものに関する。   The present invention relates to an upper blade of a down cut type crop shear, and particularly relates to an excellent cutting ability and suitable for cutting high strength steel.

近年、厚板需要分野では、例えば、ラインパイプ材用にＡＰＩ規格Ｘ１２０鋼の商用試作生産も開始されるなど鋼材の高強度化が進んでいる。
厚板を製造する製鉄所の厚板工場では、所定の厚さに圧延された鋼板の形状を矩形とすべく、幅方向両端部をサイドシャーで切断後、長手方向両端部をダウンカット式クロップシャーで切り落としているが、鋼材の高強度化にともない、剪断作業への負荷は増大する傾向で、剪断能力の向上が要望されている。 In recent years, in the field of demand for thick plates, for example, the commercialization of API standard X120 steel for line pipe materials has started, and the strength of steel materials has been increasing.
At a steel plate factory of a steel mill that manufactures thick plates, both ends in the width direction are cut with side shears so that the shape of the steel sheet rolled to a predetermined thickness is rectangular, and both ends in the longitudinal direction are down-cut type crops. Although it is cut off with a shear, as the strength of the steel material increases, the load on the shearing work tends to increase, and an improvement in shearing capability is desired.

図６はダウンカット式クロップシャーの構造を模式的に示し、門型ハウジング（図では省略）の内部でレーキ角θを有する上刃１と下刃３を有しており、上刃を上方に吊り上げてのち下刃3との間に載置した鋼板２に、上刃１を落下（落下方向：矢印５）させて剪断する。上方に吊り上げた上刃１と下刃３の間隔は、鋼板２の全厚ｔを剪断するのに十分なストローク４が得られるように設定されている。   FIG. 6 schematically shows the structure of a down-cut type crop shear, which has an upper blade 1 and a lower blade 3 having a rake angle θ inside a gate-shaped housing (not shown), with the upper blade facing upward. After the lifting, the upper blade 1 is dropped (dropping direction: arrow 5) on the steel plate 2 placed between the lower blade 3 and sheared. The distance between the upper blade 1 and the lower blade 3 suspended upward is set so that a sufficient stroke 4 is obtained to shear the entire thickness t of the steel plate 2.

ダウンカット式クロップシャーの切断力は、上刃１の被切断材への押し付け力と上刃１のレーキ角θに依存し、レーキ角θは一般に０．５〜５°のものが使用されているが、硬くて厚い等難切断材料を切断する場合は、押し付け力を増大させるか、レーキ角θを大きくする。   The cutting force of the down cut type crop shear depends on the pressing force of the upper blade 1 against the material to be cut and the rake angle θ of the upper blade 1, and the rake angle θ is generally 0.5 to 5 °. However, when cutting hard and thick difficult-to-cut materials, the pressing force is increased or the rake angle θ is increased.

押し付け力の増大は上刃の駆動装置の増強や門型フレームの補強が必要で大掛かりな設備工事となるため容易に実施できない。   Increasing the pressing force cannot be easily implemented because it requires large-scale equipment construction that requires an increase in the driving device of the upper blade and reinforcement of the portal frame.

一方、レーキ角を大きくするには、１．上刃の大きさ（刃元での刃先高さ）は変えず、レーキ角のみを大きくする、２．上刃の大きさもレーキ角も大きくする、の2つの方法がある。既設の装置において、１．上刃の大きさを変えずにレーキ角のみを大きくする方法は、図７に示すように鋼板の板厚ｔによっては、刃先においてストローク４が不足して切り残し部２１が発生する。また、２．上刃の大きさもレーキ角も大きくする方法は図８に示すように、鋼板２の板厚ｔによっては、上刃１を吊り上げた状態において、刃元に接触する部分２２が発生し、切断しようとする鋼板２を上刃の下に移動させることができない。   On the other hand, to increase the rake angle: 1. Increase the rake angle only without changing the size of the upper blade (blade height at the blade edge). There are two ways to increase the size of the upper blade and the rake angle. In existing equipment, In the method of increasing only the rake angle without changing the size of the upper blade, as shown in FIG. 7, depending on the sheet thickness t of the steel plate, the stroke 4 is insufficient at the cutting edge and the uncut portion 21 is generated. In addition, 2. As shown in FIG. 8, a method of increasing the size and rake angle of the upper blade is that depending on the thickness t of the steel plate 2, when the upper blade 1 is lifted, a portion 22 that comes into contact with the blade base is generated and is to be cut. It is impossible to move the steel plate 2 below the upper blade.

特許文献１は、ダウンカット式クロップシャーにおいて、上刃のレーキ角を、中央部は一定で、両端部にかけて大きくし刃先の幅方向の形状を略鍋底状とすることで、切断時の門型フレームへの負荷を減少させる厚鋼板用剪断機が記載されている。
実開平２−７９１１号公報 Patent document 1 is a down cut type crop shear, in which the rake angle of the upper blade is constant at the center, is increased toward both ends, and the shape in the width direction of the blade tip is substantially pan-bottom, so that the gate shape at the time of cutting A steel plate shearing machine is described which reduces the load on the frame.
Japanese Utility Model Publication 2-7911

特許文献１記載の厚鋼板用剪断機は、切断力は向上するが、用いられる上刃の形状が複雑なため、既存の設備で切断できる鋼板寸法が制限されるという問題がある。更に、複雑な形状ゆえ上刃の生産性に劣り、結果的に高価となるという問題もある。
ダウンカット式クロップシャーにおいて、上刃は消耗品で適宜新品と交換され、例えば、製鉄所の厚鋼板製造分野では約４週間に1回の頻度で実施されるので、上刃が高価になることは、厚板のコストアップに繋がる。 The shearing machine for thick steel sheet described in Patent Document 1 has a problem that the cutting force is improved, but the shape of the upper blade to be used is complicated, so that the size of the steel sheet that can be cut with existing equipment is limited. Furthermore, there is a problem in that the productivity of the upper blade is inferior due to the complicated shape, resulting in an increase in cost.
In the down cut type crop shear, the upper blade is a consumable part and is replaced with a new one as appropriate. For example, in the field of steel plate manufacturing at steelworks, it is carried out about once every four weeks. Leads to an increase in the cost of planks.

従って、本発明は、既設のダウンカット式クロップシャーの切断能力を向上させ、且つ製造が容易な上刃およびその製造方法を提供することを目的とする。   Accordingly, an object of the present invention is to provide an upper blade that can improve the cutting ability of an existing down-cut type crop shear and that can be easily manufactured, and a method for manufacturing the upper blade.

本発明者等は、直線状の刃（以下、直刃）を有する上刃を用いるダウンカット式クロップシャーの切断では、切断荷重のピークが切断初期に発生し、その後低下することに着目し、切断能力を向上させるには、尖頭荷重が低減するように、切断初期に材料に食い込む刃のレーキ角を、尖頭荷重が生じた後に材料に新たに食い込みはじめる刃のレーキ角より大きくすればよいことを見出し、上刃のうち、切断初期を受け持つ領域の刃先のレーキ角を大きくする着想を得た。
本発明の課題は以下の手段により達成可能である。 In the cutting of a down cut type crop shear using an upper blade having a straight blade (hereinafter referred to as a straight blade), the present inventors pay attention to the fact that the peak of the cutting load occurs at the beginning of cutting and then decreases, In order to improve the cutting ability, the rake angle of the blade that bites into the material at the beginning of cutting should be larger than the rake angle of the blade that starts to bite into the material after the peak load occurs so that the peak load is reduced. I found out that it was good and got the idea to increase the rake angle of the cutting edge of the upper blade in the area that handles the initial cutting.
The object of the present invention can be achieved by the following means.

１．以下の手順で求めた、刃幅方向に屈折点を挟んで、連続する二つの直刃の、刃元側の直刃のレーキ角θ１が刃先側の直刃のレーキ角θ２より大きいダウンカット式クロップシャー用上刃。
手順１：レーキ角θ２の直刃からなる上刃で、上刃の食い込み量と切断荷重の関係を求め、尖頭荷重経過後、該尖頭荷重の８０〜４５％となる切断荷重が得られる上刃の食い込み量ｄを求める。
手順２：ＸＹ座標上に、レーキ角θ２の直刃からなる上刃形状を、刃元側端部をY軸、その先端部を原点としてプロットし、前記上刃形状の刃上でｄ／ｔａｎθ２がＸ座標となる点を最大屈折点として求める。
手順３：手順２において前記上刃形状の刃上で０．５ｄ／ｔａｎθ２がＸ座標となる点を最小屈折点として求める。
手順４：手順２で求めた最大屈折点からレーキ角θ１の直線を引き、Y軸との交点を、新たな刃元側端部の最大先端部とする。
手順５：手順４で求めた最小屈折点からレーキ角θ１の直線を引き、Y軸との交点を、新たな刃元側端部の最小先端部とする。
手順６：手順４で求めた刃元側の最大先端部と手順２で求めた最大屈折点を結ぶ直線と、手順５で求めた刃元側の最小先端部と手順３で求めた最小屈折点を結ぶ直線間でこれらと平行で、一端が前記最大屈折点と最小屈折点を上下限とする範囲内で、他端が最大先端部と最小先端部を上下限とする範囲内にある直線をレーキ角θ１の刃元側の直刃とし、前記最大屈折点と前記最小屈折点を上下限とする範囲内の屈折点から刃先先端部を結ぶ直線をレーキ角θ２の刃先側の直刃とする。 1. Was determined by the following procedure, across the inflection point in the blade width direction, of the two successive straight blade, the blade root side of the rake angle theta 2 is greater than the down straight blade rake angle theta 1 is a cutting edge side of the straight edge Upper blade for cut type crop shear.
Step 1: obtained in upper blade consisting of a straight blade rake angle theta 2, obtained relation bite amount and breaking load of the upper blade, after the peak load elapsed, the cutting load the 80 to 45% of該尖head load The amount of biting d of the upper blade to be obtained is obtained.
Procedure 2: On the XY coordinates, plot the upper blade shape consisting of a straight blade with a rake angle θ 2 with the blade base side end as the Y axis and its tip as the origin, and d / A point where tan θ 2 is the X coordinate is determined as the maximum refraction point.
Step 3: A point where 0.5 d / tan θ 2 is the X coordinate on the upper blade in Step 2 is obtained as the minimum refraction point.
Procedure 4: A straight line with a rake angle θ 1 is drawn from the maximum refraction point obtained in Procedure 2, and the intersection with the Y axis is taken as the maximum tip of the new blade end.
Procedure 5: A straight line having a rake angle θ 1 is drawn from the minimum refraction point obtained in Procedure 4, and the intersection with the Y axis is taken as the minimum tip of the new blade end.
Step 6: A straight line connecting the maximum tip portion on the blade base side obtained in step 4 and the maximum refraction point obtained in step 2, the minimum tip portion on the blade base side obtained in step 5, and the minimum refraction point obtained in step 3 A straight line that is parallel to these between the straight lines connecting the two, and having one end within the range having the maximum and minimum refractive points as upper and lower limits, and the other end within the range having the maximum and minimum tip parts as upper and lower limits. A straight blade on the cutting edge side with a rake angle θ 1 , and a straight line connecting the tip of the cutting edge with a refraction point within the range where the maximum refraction point and the minimum refraction point are upper and lower limits is a straight blade on the cutting edge side with a rake angle θ 2. And

本発明によれば，以下の効果が得られ産業上極めて有用である。
１．既存設備の切断において、切断時の尖頭荷重が小さくなるので、切断時にフレームと刃先に作用する反力が低下し、設備寿命と上刃寿命が延長する。
２．切断時の尖頭荷重が小さくなるので、既存設備で、より高強度の鋼材の切断が可能で、更に、刃先が２段に屈折した形状のため、切断可能寸法を変更する必要がない。
３．既存設備より小型で、既存設備と同じ切断能力を備えた設備が可能である。 According to the present invention, the following effects are obtained, which is extremely useful industrially.
1. When cutting existing equipment, the peak load at the time of cutting is reduced, so that the reaction force acting on the frame and the cutting edge at the time of cutting is reduced, and the equipment life and upper blade life are extended.
2. Since the peak load at the time of cutting becomes small, it is possible to cut a steel material with higher strength with existing equipment. Furthermore, since the cutting edge is refracted in two steps, there is no need to change the cuttable dimension.
3. Equipment that is smaller than existing equipment and has the same cutting ability as existing equipment is possible.

図３は、ダウンカット式クロップシャーの切断における、鋼材への食い込み量と切断荷重の関係を模式的に示す図で、ダウンカット式クロップシャーの切断荷重は、切断の初期において、最初のピーク値（以下、尖頭荷重）に達した後、次第に安定して定常最大荷重となる。図５は尖頭荷重／定常最大荷重比と切断荷重の関係を示す図で、図より、尖頭値荷重は定常最大荷重の１．２５倍〜約２倍である。   FIG. 3 is a diagram schematically showing the relationship between the amount of biting into the steel material and the cutting load in the cutting of the down cut type crop shear. The cutting load of the down cut type crop shear is the first peak value in the initial stage of cutting. After reaching (peak load), the steady maximum load is gradually stabilized. FIG. 5 is a diagram showing the relationship between the peak load / steady maximum load ratio and the cutting load. From the figure, the peak value load is 1.25 times to about twice the steady maximum load.

図４は尖頭荷重が発生する際の食い込み量と材料板厚の関係を示す図で、食い込み量が板厚の約３０〜８０％となると尖頭荷重が発生する。   FIG. 4 is a diagram showing the relationship between the amount of biting and the material plate thickness when the pointed load occurs. When the amount of biting is about 30 to 80% of the plate thickness, the pointed load is generated.

本発明では、尖頭荷重を低減するように、切断初期に材料に食い込む刃のレーキ角を、尖頭荷重が生じた後に材料に新たに食い込みはじめる刃のレーキ角より大きくすることを特徴とする。   In the present invention, the rake angle of the blade that bites into the material at the initial stage of cutting is made larger than the rake angle of the blade that starts to bite into the material after the peak load occurs so as to reduce the peak load. .

図１は、本発明に係る上刃の形状を模式的に説明する上面図で、図において１は上刃、１１、１２は直刃、１３は背、１４は刃元、１５は刃先、ｈ１は刃元における刃面高さ、ｈ２は刃先における刃面高さ、ｈ３は屈折点における刃面高さを示す。 FIG. 1 is a top view schematically illustrating the shape of an upper blade according to the present invention. In the figure, 1 is an upper blade, 11 and 12 are straight blades, 13 is a back, 14 is a blade base, 15 is a blade edge, h 1 is the blade surface height at the blade edge, h 2 is the blade surface height at the blade edge, and h 3 is the blade surface height at the refraction point.

上刃１は刃幅Ｗの方向に屈折点ｃを挟んで、連続する二つの直刃１１、１２を有し、刃元側の直刃１１のレーキ角θ１が刃先側の直刃１２のレーキ角θ２より大きい。 Upper blade 1 across the refraction point c in the direction of the blade width W, has two straight edges 11, 12 successive rake angle theta 1 of the straight edge 11 of the blade root side of the cutting edge side of the straight blade 12 greater than the rake angle θ 2.

切断初期は、刃元側の直刃１１が受けもつので、刃先側の直刃１２と同じレーキ角θ２の直刃からなる上刃で切断する場合と比較して、尖頭荷重が減少し、定常荷重状態に早く移行する。
以下、図１に示す上刃形状を決定する手順について、図２を用いて具体的に説明する。 Since the straight blade 11 on the blade base side takes charge at the initial stage of cutting, the peak load is reduced as compared with the case of cutting with an upper blade made of a straight blade having the same rake angle θ 2 as the straight blade 12 on the blade edge side. , Transition to the steady load state quickly.
Hereinafter, the procedure for determining the upper blade shape shown in FIG. 1 will be specifically described with reference to FIG.

図２はレーキ角θ２の単一の直刃からなる上刃（以下、レーキ角θ２の直刃からなる上刃）にレーキ角θ１の直刃を付加した外観形状をＸＹ座標軸上において示す図で、図において１´はレーキ角θ２の直刃１２からなる上刃で、四周部をＡ，Ｂ，Ｃ，Ｄとし、レーキ角θ１の直刃はＢ、Ｂ’、Ｅとする。 Figure 2 is the upper blade (hereinafter, upper blades consisting of a straight blade rake angle theta 2) consisting of a single straight cutting edge rake angle theta 2 to the external shape by adding a straight-edge rake angle theta 1 on XY coordinate axes a diagram showing, 1 'in upper blade consisting of a straight blade 12 of the rake angle theta 2 in the figure, four circumferential portions a, B, C, is D, straight blade rake angle theta 1 is B, B', and E To do.

手順１：レーキ角θ２の直刃からなる上刃１´で、図３に一例を示した上刃の食い込み量と切断荷重の関係を求め、尖頭荷重経過後、切断荷重が定常荷重（通常、当該尖頭荷重の８０〜４５％）となる上刃の食い込み量ｄを求める。 Procedure 1: With the upper blade 1 ′ having a straight blade with a rake angle θ 2 , the relationship between the amount of biting of the upper blade shown in FIG. 3 and the cutting load is obtained, and after the peak load has elapsed, the cutting load is a steady load ( Usually, the biting amount d of the upper blade that is 80 to 45% of the peak load) is obtained.

次に、尖頭荷重を当該尖頭荷重の８０〜４５％の大きさの切断荷重まで低減させるため、直刃１２において、切断開始から尖頭荷重が発生するまでの切断を受け持つ部分のレーキ角をレーキ角θ２より大きくする。 Next, in order to reduce the peak load to a cutting load having a magnitude of 80 to 45% of the peak load, the rake angle of the portion of the straight blade 12 responsible for cutting from the start of cutting until the peak load is generated. Is larger than the rake angle θ 2 .

レーキ角θ２の直刃からなる上刃１´で尖頭荷重が発生する際の食い込み量をｄとすると、鋼板表面における、鋼板端部からの切断長さはｄ／ｔａｎθ２となるので、図２に示す幾何学的関係を用いて屈折点Ｅの位置が特定される。 Assuming that the amount of biting when the point load is generated by the upper blade 1 ′ having a straight blade with a rake angle θ 2 is d, the cutting length from the steel plate end on the steel plate surface is d / tan θ 2 . The position of the refraction point E is specified using the geometric relationship shown in FIG.

しかし、刃元側レーキ角θ１と刃先側レーキ角θ２の２つのレーキ角を持つ刃による切断の場合，定常荷重に移行するときの食い込み量ｄ‘はレーキ角θ２の単一レーキ角刃で切断したときの定常荷重に移行する食い込み量ｄとは一致しない。   However, in the case of cutting with a blade having two rake angles of the blade base side rake angle θ1 and the blade edge side rake angle θ2, the amount of biting d ′ when shifting to a steady load is cut with a single rake angle blade of the rake angle θ2. The amount of bite d that shifts to the steady load at this time does not match.

図９に刃元側レーキ角θ１と刃先側レーキ角θ２の２つのレーキ角を持つ刃と単一レーキ角θ２の直線刃の場合における、食い込み量（図では刃変位（ストローク））と切断荷重の関係を示す。２段レーキ角刃は切断開始時の尖頭値のピークが低く，定常荷重状態になるのがはやい。   FIG. 9 shows the amount of biting (blade displacement (stroke) in the figure) and cutting load in the case of a blade having two rake angles of blade edge side rake angle θ1 and blade edge side rake angle θ2 and a straight blade having a single rake angle θ2. The relationship is shown. The two-stage rake angle blade has a low peak value at the start of cutting, and it is quick to be in a steady load state.

図に示す現象は、レーキ角θ2より大きいレーキ角θ1の直線刃で切断したことにより，刃の食い込みによって始まる板の剪断において，亀裂が板厚方向に貫通して破断が早く進行した結果であると推察される。   The phenomenon shown in the figure is the result of cutting through a straight blade with a rake angle θ1 larger than the rake angle θ2, and the cracks penetrated in the plate thickness direction and the fracture progressed quickly in the shearing of the plate that started by biting the blade. It is guessed.

すなわち、一旦，板端部で亀裂が板厚方向に貫通すれば破断に至り切断荷重が下がるのでレーキ角の大きい直線刃で切断すると剪断から破断への進行が早くなり、定常荷重状態に早く移行する。   In other words, once a crack penetrates in the plate thickness direction at the end of the plate, it will break and the cutting load will decrease, so when cutting with a straight blade with a large rake angle, the progress from shearing to breaking will be faster, and the steady load state will be shifted quickly. To do.

本発明者等が、レーキ角を鋼板用ダウンカット式クロップシャーの一般的なレーキ角θ：１°〜２°とした直刃と、２段レーキ角刃を用いて図９に示す関係を求めたところ、２段レーキ角刃において食い込み量（ストローク量）ｄ´は単一レーキ角θ２の直線刃における食い込み量（ストローク量）ｄの５０％〜６０％であることが判明した。 The present inventors have obtained the relationship shown in FIG. 9 using a straight blade having a rake angle of a general rake angle θ of 1 ° to 2 ° and a two-stage rake angle blade of a steel sheet down cut type crop shear. and where the amount of bite in two stages rake angle blade (stroke amount) d'proved to be 50% to 60% of a single amount of engagement in the linear blade rake angle theta 2 (stroke) d.

前記２段レーキ角刃における元刃のレーキ角θ１は、２段レーキ角刃としたことによるストローク増加分が厚板工場で許容される範囲内となるように選定した。 The rake angle θ 1 of the main blade in the two-stage rake angle blade was selected so that the stroke increment due to the two-stage rake angle blade was within the range allowed by the thick plate factory.

従って，本発明では、屈曲点Ｅの位置を尖頭荷重が得られる食い込み量（ストローク量）ｄ´が０．５ｄ〜ｄの範囲内となるように定める。   Therefore, in the present invention, the position of the bending point E is determined so that the amount of biting (stroke amount) d ′ at which the peak load is obtained is in the range of 0.5d to d.

手順２：ＸＹ座標上に、レーキ角θ２の直刃１２からなる上刃１´の形状を、刃元側の端部１４´をY軸、その先端部Ｂを原点としてプロットし、前記直刃１２の刃上においてｄ／ｔａｎθ２がＸ座標となる点を最大屈折点Ｅとする。 Procedure 2: On the XY coordinates, plot the shape of the upper blade 1 ′ composed of the straight blade 12 with the rake angle θ 2 with the edge 14 ′ on the blade base side as the Y axis and the tip B as the origin, A point where d / tan θ 2 is the X coordinate on the blade 12 is defined as a maximum refraction point E.

手順３：手順２において前記上刃形状の刃上で０．５ｄ／ｔａｎθ２がＸ座標となる点を最小屈折点として求める。 Step 3: A point where 0.5 d / tan θ 2 is the X coordinate on the upper blade in Step 2 is obtained as the minimum refraction point.

手順４：手順２で求めた最大屈折点Ｅからレーキ角θ１の直線を引き、Y軸との交点を、刃元側の端部１４´の新たな刃元側端部の最大先端部Ｂ´とする。 Step 4: A straight line having a rake angle θ 1 is drawn from the maximum refraction point E obtained in Step 2, and the intersection with the Y axis is set as the maximum tip B of the new blade base end of the blade base end 14 ′. ′.

手順５：手順３で求めた最小屈折点Ｅ´からレーキ角θ１の直線を引き、Y軸との交点を、新たな刃元側端部の最小先端部Ｂ´´とする。 Procedure 5: A straight line having a rake angle θ 1 is drawn from the minimum refraction point E ′ obtained in Procedure 3, and the intersection with the Y axis is set as a minimum tip B ″ of the new blade end side end.

手順６：一端（屈折点）が、直線ＢＣ上の最大屈折点Ｅと最小屈折点Ｅ´を上下限とする範囲内にあり、他端（先端部）がＹ軸上で最大先端部Ｂ´と最小先端部Ｂ´´を上下限とする範囲内にある直線であって、手順４で求めた直線ＥＢ´（刃元側の最大先端部Ｂ´と手順２で求めた最大屈折点Ｅを結ぶ直線）、または手順５で求めた直線Ｅ´Ｂ´´（刃元側の最小先端部Ｂ´´と手順３で求めた最小屈折点Ｅ´を結ぶ直線）と平行の直線をレーキ角θ１の刃元側の直刃とし、最大屈折点Ｅと前記最小屈折点Ｅ´を上下限とする範囲内に求まる前記一端（屈折点）から刃先先端部を結ぶ直線をレーキ角θ２の刃先側の直刃とする。 Procedure 6: One end (refractive point) is in a range having the maximum and minimum refractive points E and E ′ on the straight line BC as upper and lower limits, and the other end (tip) is the maximum tip B ′ on the Y axis. And the straight line EB ′ obtained in step 4 (the maximum tip B ′ on the cutting edge side and the maximum refraction point E obtained in step 2). A straight line parallel to the straight line E′B ″ obtained in step 5 (a straight line connecting the minimum tip B ″ on the blade base side and the minimum refraction point E ′ obtained in step 3), or the rake angle θ. A straight blade on the blade base side of 1 and a straight line connecting the one end (refractive point) and the tip of the blade edge within a range having the maximum refraction point E and the minimum refraction point E ′ as the upper and lower limits is the blade edge of the rake angle θ 2 A straight blade on the side.

尚、屈折点から刃元側の直刃のレーキ角θ１は刃先側の直刃のレーキ角θ２より大きければ良く特に規定しない。但し、図１０に示すようにレーキ角θ１が大きすぎると、鋼材に未切断領域が発生するので、切断する鋼材寸法に応じて適宜決定することが必要である。 Incidentally, rake angle theta 1 straight blade blade root side from inflection point is not particularly specified well greater than the rake angle theta 2 of the straight blade cutting edge side. However, as shown in FIG. 10, if the rake angle θ 1 is too large, an uncut region is generated in the steel material. Therefore, it is necessary to determine appropriately according to the size of the steel material to be cut.

以上の説明では、屈折点が一つの場合について述べたが、更に刃元側の直刃に屈折点を設け、刃元側から刃先側にかけて逐次レーキ角が大きくなるようにすると、切断初期における切断荷重の上昇がなだらかとなり、表面性状に優れる切断面が得られ好ましい。   In the above description, the case where there is one refraction point has been described. However, if a refraction point is provided on the straight blade on the blade base side, and the rake angle is sequentially increased from the blade base side to the blade edge side, the cutting at the initial stage of cutting is performed. A rise in load is moderated, and a cut surface with excellent surface properties is obtained, which is preferable.

本発明例。Example of the present invention. 本発明例。Example of the present invention. 切断荷重と食い込み量の関係を示す図。The figure which shows the relationship between a cutting load and the amount of bite. 食い込み量と切断材の板厚の関係を示す図。The figure which shows the relationship between the amount of biting and the board thickness of a cutting material. 切断荷重における尖頭荷重と定常最大荷重の関係を示す図。The figure which shows the relationship between the peak load in a cutting load, and a steady maximum load. 従来例。Conventional example. 従来例。Conventional example. 従来例。Conventional example. 食い込み量（図では刃変位（ストローク））と切断荷重の関係を示す図。The figure which shows the relationship between the amount of biting (blade displacement (stroke) in the figure) and cutting load. ２段レーキ刃による切断ストロークが不足することを説明する模式図で（ａ）は従来例、（ｂ）は２段レーキ刃の場合を示す図。It is a schematic diagram explaining that the cutting stroke by a two-stage rake blade is insufficient, (a) is a prior art example, (b) is a figure which shows the case of a two-stage rake blade.

符号の説明Explanation of symbols

１ 上刃
１１、１２ 直刃
１３ 背
１４ 刃元
１５ 刃先
２ 非切断材（鋼材）
２１ 未切断部
２２ 接触部
３ 下刃
４ ストローク
５ 圧下方向
ｈ１ 刃元高さ
ｈ２ 刃先高さ
ｈ３ 屈折点における刃の高さ
θ、θ１、θ２ レーキ角 DESCRIPTION OF SYMBOLS 1 Upper blade 11, 12 Straight blade 13 Back 14 Cutting edge 15 Cutting edge 2 Non-cutting material (steel material)
21 Uncut portion 22 Contact portion 3 Lower blade 4 Stroke 5 Reduction direction h 1 Blade height h 2 Blade height h 3 Blade height θ, θ 1 , θ 2 rake angle at refraction point

Claims (1)

以下の手順で求めた、刃幅方向に屈折点を挟んで、連続する二つの直刃の、刃元側の直刃のレーキ角θ１が刃先側の直刃のレーキ角θ２より大きいダウンカット式クロップシャー用上刃。
手順１：レーキ角θ２の直刃からなる上刃で、上刃の食い込み量と切断荷重の関係を求め、尖頭荷重経過後、該尖頭荷重の８０〜４５％となる切断荷重が得られる上刃の食い込み量ｄを求める。
手順２：ＸＹ座標上に、レーキ角θ２の直刃からなる上刃形状を、刃元側端部をY軸、その先端部を原点としてプロットし、前記上刃形状の刃上でｄ／ｔａｎθ２がＸ座標となる点を最大屈折点として求める。
手順３：手順２において前記上刃形状の刃上で０．５ｄ／ｔａｎθ２がＸ座標となる点を最小屈折点として求める。
手順４：手順２で求めた最大屈折点からレーキ角θ１の直線を引き、Y軸との交点を、新たな刃元側端部の最大先端部とする。
手順５：手順３で求めた最小屈折点からレーキ角θ１の直線を引き、Y軸との交点を、新たな刃元側端部の最小先端部とする。
手順６：手順４で求めた刃元側の最大先端部と手順２で求めた最大屈折点を結ぶ直線と、手順５で求めた刃元側の最小先端部と手順３で求めた最小屈折点を結ぶ直線間でこれらと平行で、一端が前記最大屈折点と最小屈折点を上下限とする範囲内で、他端が最大先端部と最小先端部を上下限とする範囲内にある直線をレーキ角θ１の刃元側の直刃とし、前記最大屈折点と前記最小屈折点を上下限とする範囲内の屈折点から刃先先端部を結ぶ直線をレーキ角θ２の刃先側の直刃とする。 Was determined by the following procedure, across the inflection point in the blade width direction, of the two successive straight blade, the blade root side of the rake angle theta 2 is greater than the down straight blade rake angle theta 1 is a cutting edge side of the straight edge Upper blade for cut type crop shear.
Step 1: obtained in upper blade consisting of a straight blade rake angle theta 2, obtained relation bite amount and breaking load of the upper blade, after the peak load elapsed, the cutting load the 80 to 45% of該尖head load The amount of biting d of the upper blade to be obtained is obtained.
Procedure 2: On the XY coordinates, plot the upper blade shape consisting of a straight blade with a rake angle θ 2 with the blade base side end as the Y axis and its tip as the origin, and d / A point where tan θ 2 is the X coordinate is determined as the maximum refraction point.
Step 3: A point where 0.5 d / tan θ 2 is the X coordinate on the upper blade in Step 2 is obtained as the minimum refraction point.
Procedure 4: A straight line with a rake angle θ 1 is drawn from the maximum refraction point obtained in Procedure 2, and the intersection with the Y axis is taken as the maximum tip of the new blade end.
Step 5: a straight line is drawn rake angle theta 1 from minimum refractive point obtained in Step 3, the intersection with the Y axis, and the minimum tip of a new blade root side end portion.
Step 6: A straight line connecting the maximum tip portion on the blade base side obtained in step 4 and the maximum refraction point obtained in step 2, the minimum tip portion on the blade base side obtained in step 5, and the minimum refraction point obtained in step 3 A straight line that is parallel to these between the straight lines connecting the two, and having one end within the range having the maximum and minimum refractive points as upper and lower limits, and the other end within the range having the maximum and minimum tip parts as upper and lower limits. A straight blade on the cutting edge side with a rake angle θ 1 , and a straight line connecting the tip of the cutting edge with a refraction point within the range where the maximum refraction point and the minimum refraction point are upper and lower limits is a straight blade on the cutting edge side with a rake angle θ 2. And
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158016U (en) * 1984-09-22 1986-04-18
JP4946124B2 (en) * 2006-03-27 2012-06-06 Ｊｆｅスチール株式会社 Replacement upper blade for guillotine type crop shear and method of shearing steel using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158016U (en) * 1984-09-22 1986-04-18
JP4946124B2 (en) * 2006-03-27 2012-06-06 Ｊｆｅスチール株式会社 Replacement upper blade for guillotine type crop shear and method of shearing steel using the same

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