JP7406091B2 - Manufacturing method for cutting molds and cutting parts - Google Patents
Manufacturing method for cutting molds and cutting parts Download PDFInfo
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- JP7406091B2 JP7406091B2 JP2020031076A JP2020031076A JP7406091B2 JP 7406091 B2 JP7406091 B2 JP 7406091B2 JP 2020031076 A JP2020031076 A JP 2020031076A JP 2020031076 A JP2020031076 A JP 2020031076A JP 7406091 B2 JP7406091 B2 JP 7406091B2
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- 238000005520 cutting process Methods 0.000 title claims description 60
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 43
- 239000010959 steel Substances 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 8
- 238000007747 plating Methods 0.000 description 28
- 239000002184 metal Substances 0.000 description 23
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 229910018134 Al-Mg Inorganic materials 0.000 description 2
- 229910018467 Al—Mg Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Description
本発明は、切断加工を施しためっき金属板の切断端面に、従来よりも多くのめっき金属を回りこませることが可能な切断加工用の金型及び切断加工部品の製造方法に関する。 The present invention relates to a mold for cutting and a method for manufacturing cut parts , which allows a larger amount of plated metal to be wrapped around the cut end surface of a plated metal plate that has been cut than before.
溶融亜鉛めっき鋼板の切断加工において、上型刃先にＲ＞０ｍｍのＲを付与することで点接触を回避し、めっき層を分断させずに切断端面に回りこませる切断加工方法が開示されている。この切断加工方法によれば、これまで刃先のＲ＝０であった汎用の金型よりも多くのめっき層を切断端面に回りこませることができ、切断端面の耐食性が向上した切断加工部品が得られる。 In cutting a hot-dip galvanized steel sheet, a cutting method is disclosed in which point contact is avoided by imparting an R of R > 0 mm to the upper mold cutting edge, and the plating layer is wrapped around the cut end surface without dividing it. . According to this cutting method, more plating layers can be wrapped around the cut end surface than conventional general-purpose molds with a cutting edge R = 0, and cut parts with improved corrosion resistance on the cut end surface can be produced. can get.
めっき鋼板の切断端面に赤錆が発生すると外観が粗悪に見えるため、改善が求められている。しかし、従来技術による切断加工方法では、切断端面のうち、めっき金属が切断端面に回りこんで防錆能を有する面積は７０％程度であり、残り３０％の部分は屋外暴露を行うと赤錆が発生してしまうことから、防錆能を有する面積率をさらに高める必要がある。 When red rust occurs on the cut end surface of a plated steel sheet, the appearance looks poor, so improvements are needed. However, with conventional cutting methods, the area of the cut end surface where the plated metal wraps around the cut end surface and has rust prevention ability is about 70%, and the remaining 30% is exposed to red rust when exposed outdoors. Therefore, it is necessary to further increase the area ratio having antirust ability.
本発明は次のような金型を用いることにより、上記の課題を解決するものである。
（１）固定金型と可動金型からなる金型を用いてめっき鋼板を切断加工するための切断加工用金型であって、前記可動金型は、前記可動金型による前記めっき鋼板の切断加工の進行に伴い、固定金型と可動金型の間のクリアランスがｃ＋Δｃ（Δｃ＞０）である第一段切断加工と、前記第一段切断加工の後に、固定金型と可動金型の間のクリアランスがｃである第二段切断加工が行われるように構成され、前記可動金型のうち、前記第一段切断加工を行う部分を第一段刃、前記第二段切断加工を行う部分を第二段刃とするとき、前記可動金型による前記めっき鋼板の切断加工の進行に沿って、クリアランスがｃ超えｃ＋Δｃ未満の部分の可動金型の表面は、切断加工の進行方向に対して前記第一段刃の表面から略垂直に設けられ、凸湾曲面を経て前記第二段刃の表面に至ることを特徴とする切断加工用金型。
The present invention solves the above problems by using the following mold.
(1) A cutting die for cutting a plated steel plate using a die consisting of a fixed die and a movable die, wherein the movable die is used for cutting the plated steel plate by the movable die. As the machining progresses, the clearance between the fixed mold and the movable mold is c+Δc (Δc>0), and after the first stage cutting, the clearance between the fixed mold and the movable mold is The movable mold is configured such that a second stage cutting process is performed with a clearance of c , and a part of the movable mold that performs the first stage cutting process is used as a first stage blade, and a part that performs the second stage cutting process. When the part is used as a second stage blade, along the progress of cutting of the plated steel plate by the movable mold, the surface of the movable mold in the part where the clearance exceeds c and is less than c + Δc is A cutting mold characterized in that the metal molding die is provided substantially perpendicularly from the surface of the first stage blade, and reaches the surface of the second stage blade via a convex curved surface .
（２）前記固定金型はダイであり、前記可動金型はパンチである、（１）に記載の切断加工用金型。 (2) The cutting mold according to (1), wherein the fixed mold is a die and the movable mold is a punch.
（３）本発明は、切断加工部品の製造方法であって、（１）または（２）に記載の切断加工用金型を用いてめっき鋼板を切断する工程を備える、切断加工部品の製造方法に関する。(3) The present invention is a method for manufacturing cut parts, the method comprising a step of cutting a plated steel plate using the cutting mold described in (1) or (2). Regarding.
本発明の可動金型を用いてめっき鋼板の切断加工を行うと、従来技術による切断加工よりも、切断端面においてめっき金属が回り込んで防性能を有する面積率を、例えば９５％程度まで大きくすることが可能である。したがって、めっき鋼板の切断端面に赤錆が発生して外観が粗悪に見えるという問題点を大いに解決することができる。 When the movable mold of the present invention is used to cut a plated steel plate, the plated metal wraps around the cut end surface, increasing the area ratio with protective properties to about 95%, compared to cutting using conventional techniques. Is possible. Therefore, the problem that red rust occurs on the cut end surface of the plated steel sheet and the appearance looks inferior can be greatly solved.
図１（Ａ）は、従来技術における切断加工の金型形状を示している。図１（Ａ）は固定金型であるダイと、可動金型であるパンチと、切断加工を開始する前に、ダイの上に載置されている被切断金属板（めっき鋼板）を図示している。 FIG. 1(A) shows the shape of a mold for cutting in the prior art. Figure 1 (A) shows a die as a fixed mold, a punch as a movable mold, and a metal plate to be cut (plated steel plate) placed on the die before cutting starts. ing.
ダイとパンチの間のクリアランスはｃであり、また、パンチの肩ＲであるＲｐは０超えである。また、パンチを図中に示したストローク方向の方向に移動させることにより、パンチとダイとがめっき鋼板を挟み込んで切断加工が行われる。 The clearance between the die and the punch is c, and Rp, which is the shoulder radius of the punch, is greater than 0. Further, by moving the punch in the stroke direction shown in the figure, the punch and die sandwich the plated steel plate and cutting is performed.
図１（Ｂ）は、本発明の金型の構成を示している。パンチのストローク方向の先端には、クリアランスｃよりもΔｃ（以下、段差間距離という）だけ大きなクリアランスを有するように、第一段刃が設けられている。この第一段刃のパンチ肩ＲであるＲｐはＲｐ≧０である。また、クリアランスがｃである部分は従来技術と同様であり、この部分を、第二段刃という。 FIG. 1(B) shows the configuration of a mold according to the present invention. A first stage blade is provided at the tip of the punch in the stroke direction so as to have a clearance larger than the clearance c by Δc (hereinafter referred to as the distance between steps). Rp, which is the punch shoulder R of this first stage blade, satisfies Rp≧0. Further, the portion where the clearance is c is the same as in the prior art, and this portion is referred to as the second stage blade.
図２は、本発明の金型を用いて、めっき鋼板の切断加工を行う場合の金型の動きに伴うめっき層の動きを説明する説明図である。まず、図２（Ａ）は、図１（Ａ）に対応するものであり、固定金型であるダイと、可動金型であるパンチと、切断加工を開始する前に、ダイの上に載置されているめっき鋼板を示している。 FIG. 2 is an explanatory diagram illustrating the movement of the plating layer as the mold moves when cutting a plated steel plate using the mold of the present invention. First, Fig. 2(A) corresponds to Fig. 1(A), and shows a fixed die, a movable die, and a punch, which are placed on the die before starting the cutting process. It shows the plated steel plate installed.
図２（Ｂ）は、ストロークの進行に伴って第一段刃がめっき鋼板に押込まれて、切断が始まる。このとき、ダイとパンチ（第一段刃）の間のクリアランスはｃ＋Δｃであり、めっき鋼板の表面には、クリアランスがｃである場合よりも、大きなダレが形成されるとともに、段差間領域のめっき層体積が増加する。これは、段差間領域のめっき層体積は、ダレが形成されない場合は線長Δｃに比例するが、ダレが形成される場合はΔｃ／ｃｏｓθに比例すると考えられるためである。 In FIG. 2(B), as the stroke progresses, the first stage blade is pushed into the plated steel plate and cutting begins. At this time, the clearance between the die and the punch (first stage blade) is c + Δc, and a larger sag is formed on the surface of the plated steel sheet than when the clearance is c, and the plating in the area between the steps is Layer volume increases. This is because it is thought that the volume of the plating layer in the region between the steps is proportional to the line length Δc when no sag is formed, but is proportional to Δc/cos θ when the sag is formed.
図２（ｃ）は、さらにストロークが進行し、第二段刃がめっき鋼板に押込まれて、再切断が始まる。このとき、めっき鋼板が切断されるまでの間に、段差間領域にあるめっき層は第２二段刃の湾曲面によりストローク方向に押圧されて、湾曲面に沿って流動しようとする。 In FIG. 2(c), the stroke progresses further, the second stage blade is pushed into the plated steel plate, and re-cutting begins. At this time, until the plated steel sheet is cut, the plated layer in the region between the steps is pressed in the stroke direction by the curved surface of the second two-stage blade and tends to flow along the curved surface.
このときのめっき層の挙動について、図３により説明する。
第２段刃の段差間領域の部分は湾曲面を持つため、この湾曲面と接しているめっき層には、切断加工の進行に伴い、めっき層の厚み方向に圧縮応力が掛かる。
めっき層は、めっき層の厚み方向に圧縮を受けることで、めっき層の厚み方向と直交方向に流動しようとする。この流動する方向には、図３の中に示したように、Ａ点を境にして、端面側と抜き落とし側の２通りがあるが、本発明の可動金型（パンチ）を用いている場合は、抜き落とし側へ流動しためっき金属であっても、第一段刃の平面部に塞き止められてしまうため、抜き落とされることはなく、湾曲面とめっき鋼板の間に残留して集積することになる。
The behavior of the plating layer at this time will be explained with reference to FIG.
Since the region between the steps of the second stage blade has a curved surface, compressive stress is applied to the plating layer in contact with the curved surface in the thickness direction of the plating layer as the cutting process progresses.
The plating layer tends to flow in a direction orthogonal to the thickness direction of the plating layer by being compressed in the thickness direction of the plating layer. As shown in Fig. 3, there are two directions of this flow, the end side and the punching side, with the point A as the boundary, but the movable mold (punch) of the present invention is used. In this case, even if the plated metal flows toward the removal side, it will be blocked by the flat part of the first stage blade, so it will not be removed and will remain between the curved surface and the plated steel plate. It will accumulate.
図２（ｃ）に戻り、このあとストロークが進み第二段刃がめっき鋼板を切断したときだとき、湾曲面とめっき鋼板の間に集積しためっき金属は、切断端面の表面を覆うことになる。 Returning to Figure 2(c), when the stroke progresses and the second stage blade cuts the plated steel plate, the plated metal that has accumulated between the curved surface and the plated steel plate will cover the surface of the cutting end. .
図４（Ａ）は従来技術の金型により、また図４（Ｂ）は本発明の金型により切断加工を行った場合の切断端面におけるめっき金属の分布を、シミュレーションにより求めたものである。本発明の金型による切断加工のほうが、切断端面においてめっき金属の途切れが少なく、また切断端面のほぼ全域にわたってめっき金属に覆われていることが分かる。 FIG. 4(A) shows the distribution of plated metal on the cut end surface obtained by simulation when cutting is performed using the conventional mold and FIG. 4(B) uses the mold of the present invention. It can be seen that the cutting process using the mold of the present invention has fewer discontinuities in the plated metal on the cut end surface, and almost the entire cut end surface is covered with the plated metal.
それに対して、従来技術の可動金型は第一段刃しかないため、第二段刃の湾曲面でめっき層に圧縮を掛ける作用は働かず、また、それと同時に、抜き落とし側へ流動しためっき金属を第一段刃の平面部が塞き止めてくれる作用もなく、そのまま抜き落とし側へ流出してしまう。そのため、切断端面においてめっき金属が途切れやすく、また切断端面のほぼ全域にわたってめっき金属が蓋うことも困難である。 On the other hand, since the movable mold of the prior art has only the first stage blade, the curved surface of the second stage blade does not compress the plating layer, and at the same time, the plating that flows toward the removal side does not work. The flat part of the first stage blade does not block the metal, and it flows out to the extraction side. Therefore, the plating metal tends to be interrupted at the cut end surface, and it is also difficult to cover almost the entire cut end surface with the plating metal.
（金型の形状）
本発明の金型について、好ましい各部の大きさは次のとおりである（図５）。
Ｒｐ１： ０ 以上 ０．５×Ｒｐ２ 以下 （ｍｍ）
Ｒｐ２： ０．５ 以上 ２．０ 以下 （ｍｍ）
ｈ ： ０．５ 以上 １．０ 以下 （ｍｍ）
ｃ ： めっき鋼板の板厚の１％程度
Δｃ ： ０．３ 以上 ０．７ 以下、特に好ましくは０．５ （ｍｍ）
(Mold shape)
Regarding the mold of the present invention, the preferred sizes of each part are as follows (FIG. 5).
Rp1: 0 or more 0.5×Rp2 or less (mm)
Rp2: 0.5 or more 2.0 or less (mm)
h: 0.5 or more and 1.0 or less (mm)
c: About 1% of the plate thickness of the plated steel plate Δc: 0.3 or more and 0.7 or less, particularly preferably 0.5 (mm)
（金型の材質、表面処理等）
本発明の金型について、材質は例えばＳＫＤ１１であり、＃１０００程度の研磨仕上げであればよく、特に表面処理は必要ではない。また、硬度はＨＲＣ６０程度でよく、通常焼入れで構わない。
(Mold material, surface treatment, etc.)
Regarding the mold of the present invention, the material is, for example, SKD11, and it is sufficient that it is polished to about #1000, and no particular surface treatment is required. Further, the hardness may be about HRC60, and normal quenching may be used.
本発明の金型を用いて切断加工を行うにあたり、ストローク量は図５中の領域Ｓがダイ内径に進入する程度以上であればよい。また、ストロ－ク速度は、通常の切断加工において行われるストローク速度と同じ程度で構わない。 When performing cutting using the mold of the present invention, the stroke amount may be at least as long as the area S in FIG. 5 enters the inner diameter of the die. Further, the stroke speed may be approximately the same as the stroke speed performed in normal cutting.
また、本発明の可動金型（パンチ）と対にして用いる固定金型は、通常の表面処理鋼板の切断加工に用いられる固定金型（ダイ）と同じものを用いることができ、特別な仕様の固定金型である必要はない。 In addition, the fixed mold used in pair with the movable mold (punch) of the present invention can be the same as the fixed mold (die) used for cutting ordinary surface-treated steel sheets, and special specification It does not need to be a fixed mold.
（表面処理鋼板）
本発明において用いられる表面処理鋼板としては、表面にめっきが施された鋼板を用いることが好ましい。ここで、めっきとしては、Ｚｎ系、Ｚｎ－Ａｌ系、Ｚｎ－Ａｌ－Ｍｇ系、Ｚｎ－Ａｌ－Ｍｇ－Ｓｉ系の金属めっき又は合金めっきが挙げられる。その中でも、Ｚｎ－Ａｌ－Ｍｇ系の合金めっきが施された鋼板を用いることが好ましい。ここで、合金めっきとしては、めっきの全モル数に対して、Ｚｎを８０質量％以上含有することが好ましく、９０質量％以上含有することがより好ましい。
(Surface treated steel plate)
As the surface-treated steel sheet used in the present invention, it is preferable to use a steel sheet whose surface is plated. Examples of the plating include Zn-based, Zn-Al-based, Zn-Al-Mg-based, and Zn-Al-Mg-Si-based metal plating or alloy plating. Among these, it is preferable to use a steel plate plated with a Zn-Al-Mg alloy. Here, the alloy plating preferably contains Zn in an amount of 80% by mass or more, more preferably 90% by mass or more, based on the total number of moles of the plating.
ここで、表面処理鋼板におけるめっき付着量は、好ましくは６０ｇ／ｍ２、より好ましくは９０ｇ／ｍ２を下限とし、また、好ましくは４５０ｇ／ｍ２、より好ましくは１９０ｇ／ｍ２を上限とする。特に、表面処理鋼板へのめっき付着量を９０ｇ／ｍ２以上にすることで、切断端面にめっき金属が回り込み易くなるため、剪断加工後の耐食性を向上できる。 Here, the coating weight on the surface-treated steel sheet is preferably 60 g/m 2 , more preferably 90 g/m 2 as the lower limit, and preferably 450 g/m 2 , more preferably 190 g/m 2 as the upper limit. . In particular, by setting the amount of plating deposited on the surface-treated steel sheet to 90 g/m 2 or more, the plating metal can easily wrap around the cut end surface, so that the corrosion resistance after shearing can be improved.
本発明は、板厚が大きい表面処理鋼板を用いても、切断端面の耐食性に優れる部品が得られる。切断加工に供される表面処理鋼板の板厚は、作製される部品の形状、機械的強度、重量等に基づいて適宜に設定できる。例えば、２．０ｍｍを超える板厚の表面処理鋼板を用いても、切断端面にめっき金属が十分に回り込み、切断端面を被覆するので、切断加工後の耐食性が向上する。 According to the present invention, even if a surface-treated steel plate having a large thickness is used, a component having excellent corrosion resistance at the cut end face can be obtained. The thickness of the surface-treated steel plate to be subjected to cutting can be appropriately set based on the shape, mechanical strength, weight, etc. of the parts to be manufactured. For example, even if a surface-treated steel plate with a thickness exceeding 2.0 mm is used, the plated metal sufficiently wraps around the cut end face and covers the cut end face, so that the corrosion resistance after cutting is improved.
（パンチＡ、パンチＢ）
本発明の金型の一実施形態である第一段刃と第二段刃を有するパンチＡを準備した。一方、本発明の金型の実施形態には該当しないパンチＢも用意した。それぞれ、各部の大きさは表１のとおりである。また、いずれのパンチも、材質はＳＫＤ１１であり、通常焼入れにより硬度をＨＲＣ６０に調整し、＃１０００の表面処理を施した。
(Punch A, Punch B)
A punch A having a first stage blade and a second stage blade, which is an embodiment of the mold of the present invention, was prepared. On the other hand, punch B, which does not correspond to the embodiment of the mold of the present invention, was also prepared. The sizes of each part are shown in Table 1. The material of each punch was SKD11, the hardness was adjusted to HRC60 by normal quenching, and the surface treatment was #1000.
(ダイ)
パンチＡまたはパンチＢと対にして用いるダイは１種類のみ準備し、どちらのパンチにもこのダイを用いて、表面処理鋼板の切断加工を行った。このダイのダイ肩Ｒは０とした。材質はＳＫＤ１１であり、通常焼入れにより硬度をＨＲＣ６０に調整し、＃１０００の表面処理を施した。
(Thailand)
Only one type of die was prepared to be paired with punch A or punch B, and this die was used for both punches to cut the surface-treated steel sheet. The die shoulder R of this die was set to 0. The material was SKD11, the hardness was adjusted to HRC60 by normal quenching, and the surface treatment was #1000.
（表面処理鋼板）
表面処理鋼板として、板厚がそれぞれ３．２ｍｍ、４．５ｍｍ、６．０ｍｍで、めっき付着量２９０ｇ／ｍ２であるＺｎ－６％Ａｌ－３％Ｍｇ（質量比）合金めっき鋼板を用いた。それらのうち板厚が３．２ｍｍである表面処理鋼板は、鋼板の部分の硬さは１２９Ｈｖ、めっきの部分の硬さは１０３Ｈｖであった。
(Surface treated steel plate)
As the surface-treated steel sheets, Zn-6%Al-3%Mg (mass ratio) alloy-plated steel sheets were used, each having a thickness of 3.2 mm, 4.5 mm, and 6.0 mm, and a coating weight of 290 g/m2. . Among them, the surface-treated steel plate with a plate thickness of 3.2 mm had a hardness of 129 Hv in the steel plate portion and 103 Hv in the plated portion.
Ｈｖ
（切断加工）
切断加工は、１辺の長さが４０ｍｍの角型ダイ４と、クリアランスが所定の値になるように大きさを変更したパンチ１を用い、板押さえ５により表面処理鋼板１を保持して行った。切断加工の速度は１２０ｍｍ／ｓとした。
Hv
(cutting process)
The cutting process was carried out using a square die 4 with a side length of 40 mm and a punch 1 whose size was changed so that the clearance would be a predetermined value, and by holding the surface-treated steel plate 1 with a plate holder 5. Ta. The cutting speed was 120 mm/s.
（耐食性の評価）
切断加工して得られた切断加工品を屋外にて大気曝露試験を行い、切断端面へ目立った赤錆が発生するまでの日数を１５日ごとに観察した。その結果を表２に示す。表２には、各切断部品に用いた表面処理鋼板の板厚や、切断加工の条件も合わせて示している。
(Evaluation of corrosion resistance)
The cut products obtained by cutting were subjected to an outdoor atmospheric exposure test, and the number of days until noticeable red rust appeared on the cut end surface was observed every 15 days. The results are shown in Table 2. Table 2 also shows the thickness of the surface-treated steel plate used for each cut part and the cutting conditions.
まず、パンチＢを用いて切断加工を行った表面処理鋼板の切断加工部品である表２のＮｏ．１１～１３は、第一段刃のみ有するパンチを用いて切断加工を行った切断加工品である。そのため、切断端面へのめっき回り込み長さが短く、切断端面においてめっき金属で覆われた切断端面の割合［Ｂ］／［Ａ］はたかだか７０％程度どまりであった。 First, No. 2 in Table 2, which is a cut part of a surface-treated steel plate that was cut using Punch B. Nos. 11 to 13 are cut products that were cut using a punch having only a first-stage blade. Therefore, the length of the plating around the cut end surface was short, and the ratio [B]/[A] of the cut end surface covered with the plating metal was only about 70% at most.
一方、表２のＮｏ．１～３は、本発明の金型の実施形態に属するパンチＡ、すなわち、第一段刃と第二段刃を有するパンチＡを用いて切断加工を行った切断加工品である。そのため、切断端面へのめっき回り込み長さが長く、切断端面の８０％以上がめっき金属で覆われた切断端面を有していた。 On the other hand, No. 2 in Table 2. 1 to 3 are cut products that were cut using a punch A belonging to an embodiment of the mold of the present invention, that is, a punch A having a first stage blade and a second stage blade. Therefore, the length of the plating around the cut end surface was long, and the cut end surface had a cut end surface in which 80% or more of the cut end surface was covered with plated metal.
表２のＮｏ．１～３とＮｏ．１１～１３の切断加工品について大気暴露試験を行って、９０日後の切断端面を図４の（ａ）と（ｂ）に示す。（ａ）はＮｏ．１１の切断端面であり、切断端面の下部において赤錆が発生していた。一方、（ｂ）はＮｏ．１の切断端面であり、赤錆の発生は認められず、Ｎｏ．１１と比較して耐食性は大いに向上していた No. of Table 2 1 to 3 and No. An atmospheric exposure test was conducted on the cut products Nos. 11 to 13, and the cut end surfaces after 90 days are shown in FIGS. 4(a) and 4(b). (a) is No. This is the cut end surface of No. 11, and red rust had occurred at the lower part of the cut end surface. On the other hand, (b) is No. This is the cut end surface of No. 1, and no red rust was observed. Corrosion resistance was greatly improved compared to No. 11.
１Ａ 可動金型（従来技術）
１Ｂ 可動金型（本発明）
３ 金属板
４ 固定金型
５ めっき層
６ 第１段刃の平面部
Ｓ ストローク方向
1A Movable mold (conventional technology)
1B Movable mold (present invention)
3 Metal plate 4 Fixed mold 5 Plating layer 6 Flat part of first stage blade S Stroke direction
Claims (3)
前記可動金型は、前記可動金型による前記めっき鋼板の切断加工の進行に伴い、固定金型と可動金型の間のクリアランスがｃ＋Δｃ（Δｃ＞０）である第一段切断加工と、前記第一段切断加工の後に、固定金型と可動金型の間のクリアランスがｃである第二段切断加工が行われるように構成され、
前記可動金型のうち、前記第一段切断加工を行う部分を第一段刃、前記第二段切断加工を行う部分を第二段刃とするとき、
前記可動金型による前記めっき鋼板の切断加工の進行に沿って、クリアランスがｃ超えｃ＋Δｃ未満の部分の可動金型の表面は、切断加工の進行方向に対して前記第一段刃の表面から略垂直に設けられ、凸湾曲面を経て前記第二段刃の表面に至る
ことを特徴とする切断加工用金型。 A cutting mold for cutting a plated steel plate using a mold consisting of a fixed mold and a movable mold,
As the movable mold progresses in cutting the plated steel sheet , the movable mold performs a first stage cutting process in which the clearance between the fixed mold and the movable mold is c+Δc (Δc>0); After the first stage cutting process, a second stage cutting process is performed in which the clearance between the fixed mold and the movable mold is c ,
When the part of the movable mold that performs the first-stage cutting process is a first-stage blade, and the part that performs the second-stage cutting process is a second-stage blade,
As the cutting process of the plated steel plate by the movable die progresses, the surface of the movable die in a portion where the clearance exceeds c and is less than c+Δc is approximately from the surface of the first stage blade in the direction of progress of the cutting process. A cutting mold characterized in that it is provided vertically and reaches the surface of the second stage blade through a convex curved surface .
請求項１に記載の切断加工用金型。 The fixed mold is a die, and the movable mold is a punch.
The cutting mold according to claim 1.
請求項１または２に記載の切断加工用金型を用いてめっき鋼板を切断する工程を備える、A step of cutting a plated steel plate using the cutting mold according to claim 1 or 2,
切断加工部品の製造方法。A method of manufacturing cut parts.
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| JP2009178729A (en) | 2008-01-30 | 2009-08-13 | Nippon Steel Corp | Punching method by shoulder type punch and shoulder type punch |
| JP2012101257A (en) | 2010-11-11 | 2012-05-31 | Nisshin Steel Co Ltd | Punch for shearing coated steel sheet and method of shearing coated steel sheet |
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| JP2009178729A (en) | 2008-01-30 | 2009-08-13 | Nippon Steel Corp | Punching method by shoulder type punch and shoulder type punch |
| JP2012101257A (en) | 2010-11-11 | 2012-05-31 | Nisshin Steel Co Ltd | Punch for shearing coated steel sheet and method of shearing coated steel sheet |
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