TWI695746B - Surface-treated steel plate part with cut end face and its cut processing method - Google Patents
Surface-treated steel plate part with cut end face and its cut processing method Download PDFInfo
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Abstract
本發明所要解決的問題在於提供一種切斷端面的耐腐蝕性優異的零件及其切斷加工方法，該零件將表面處理鋼板作為材料且具有切斷加工而成的端面。 為了解決此問題，本發明的切斷端面的耐腐蝕性優異的零件，其包含被切斷加工後的表面處理鋼板的切斷端面，其中，前述切斷端面的形狀，其在板厚方向上顯現的第一塌邊的長度是前述表面處理鋼板的板厚的0.10倍以上，且在平面方向上顯現的第二塌邊的長度是前述表面處理鋼板的板厚的0.45倍以上。又，當進行切斷加工時，使用金屬模具來進行切斷加工，該金屬模具，其將模具與沖頭之間的間隙設為前述表面處理鋼板的板厚的1～20%，且在模具和沖頭的至少一方的肩部上賦予有前述表面處理鋼板的板厚的0.12倍以上的曲率半徑。The problem to be solved by the present invention is to provide a part with excellent corrosion resistance of a cut end face and a cut processing method thereof, which uses a surface-treated steel plate as a material and has a cut end face. In order to solve this problem, the part with excellent corrosion resistance of the cut end face of the present invention includes the cut end face of the surface-treated steel sheet after being cut, wherein the shape of the cut end face in the plate thickness direction The length of the first sag appearing is 0.10 times or more of the thickness of the surface-treated steel sheet, and the length of the second sag appearing in the plane direction is 0.45 times or more of the thickness of the surface-treated steel sheet. In addition, when the cutting process is performed, the cutting process is performed using a metal mold which sets the gap between the mold and the punch to 1 to 20% of the thickness of the surface-treated steel plate, and the mold A radius of curvature of 0.12 times or more of the thickness of the surface-treated steel sheet is provided on at least one shoulder of the punch and the punch.
Description
本發明提供一種切斷端面的耐腐蝕性優異的零件及其切斷加工方法，該零件用來作為汽車和家電製品等的零件，其將表面處理鋼板作為材料且具有切斷加工而成的端面。The present invention provides a part with excellent corrosion resistance of a cut end face and a cut processing method thereof. The part is used as a part for automobiles, home appliances, etc., which uses a surface-treated steel plate as a material and has a cut end face .
先前，作為汽車和家電等所使用的零件，是將由冷軋鋼板所構成的材料加以切斷和進行塑性加工來作成規定形狀，其後施加表面處理而成，但是近年來，為了提升零件的耐腐蝕性、及省略步驟來削減成本的目的，這類零件逐漸變成大多是使用已預先施加表面處理的鋼板(稱為「表面處理鋼板」)作為材料，並將此鋼板加以切斷和進行塑性加工來作成，藉此來省略塑性加工後的表面處理。此處，當在切斷和塑性加工後施加表面處理的情況，因為也同時會對切斷端面施加表面處理，所以切斷端面變成具有與平面部同等的耐腐蝕性。另一方面，當使用表面處理鋼板作為材料且省略切斷和塑性加工後的表面處理步驟的情況，切斷端面呈現切斷加工後直接露出鋼材的狀態，所以依據該零件的放置環境的不同，可能會有在切斷端面產生鐵銹(銹斑)的情況。切斷端面的鐵銹，不僅造成外觀不佳，且鐵銹產生區域隨著時間經過還會在經施加表面處理後的平面部上擴大，因而有造成零件強度降低的疑慮，又，特別是如果在家電製品上產生鐵銹掉落，則也會有電性短路的疑慮。Previously, as parts used in automobiles, home appliances, etc., materials made of cold-rolled steel sheets were cut and plastic-processed into a predetermined shape, and then surface-treated, but in recent years, in order to improve the resistance of parts Corrosion, and omission of steps to reduce costs. These types of parts have gradually become mostly made of steel plates that have been surface-treated in advance (referred to as "surface-treated steel plates"), and the steel plates are cut and plastically processed. It was created to omit the surface treatment after plastic working. Here, when the surface treatment is applied after cutting and plastic working, since the surface treatment is also applied to the cut end surface at the same time, the cut end surface has the same corrosion resistance as the flat portion. On the other hand, when using a surface-treated steel sheet as a material and omitting the surface treatment steps after cutting and plastic working, the cut end face is directly exposed to the steel after cutting, so depending on the placement environment of the part, There may be rust (rust spots) on the cut end surface. Cutting off the rust on the end surface not only causes a poor appearance, but also the rust generation area will expand on the flat surface after the surface treatment is applied over time, so there is a concern that the strength of the part will be reduced, especially if it is in household appliances If there is rust falling on the product, there is a possibility of electrical short circuit.
例如在專利文獻1中，提案有一種提升沖壓加工後的端面的防銹能力的方法，其針對板厚2mm以下的Zn(鋅)類鍍覆鋼板，使用金屬模具來進行沖壓加工，該金屬模具，其在沖頭或模具的任一方的肩部具有前述Zn類鍍覆鋼板的板厚的0.1～0.5倍的曲率半徑，藉此將在沖壓加工後的沖壓端面上的剪切面的比率作成90%以上且將剪切面的鋅層覆蓋率作成50%以上。又，在專利文獻2中，提案有一種使切斷端面的形狀滿足以下表示的數式(1)的方法。 t2
／(M‧Rs)≦0.2‧‧‧(1) 此處，t是板厚，M是Zn的基重(每單位面積的附著量)，Rs是剪切面的比率。For example, in Patent Document 1, there is proposed a method for improving the rust prevention ability of an end face after press working, which uses a metal mold to perform press processing on a Zn (zinc)-plated steel plate having a plate thickness of 2 mm or less. , Which has a radius of curvature of 0.1 to 0.5 times the thickness of the Zn-based plated steel plate on the shoulder of either the punch or the die, thereby making the ratio of the shear plane on the stamping end face after stamping 90% or more, and the coverage of the zinc layer on the shear surface should be 50% or more. In addition,
[先前技術文獻] (專利文獻) 專利文獻1：日本專利第5272518號公報 專利文獻2：日本特開平10-280116號公報[Prior Art Literature] (Patent Literature) Patent Literature 1: Japanese Patent No. 5272518 Patent Literature 2: Japanese Patent Laid-Open No. 10-280116
[發明所欲解決的問題] 然而，在專利文獻1和專利文獻2提案的方法中，僅將板厚2.0mm以下的材料作為加工對象，即便想要適用於板厚超過2.0mm的材料中，也會因為剪切面的鋅層覆蓋率不足而產生鐵銹，而會有無法適用的情況。 因此，本發明的目的主要是提供一種零件，即便在將板厚超過2.0mm的表面處理鋼板作為材料的情況下，也能夠抑制在切斷加工後的端面上產生鐵銹。[Problems to be Solved by the Invention] However, in the method proposed in Patent Document 1 and
[解決問題的技術手段] 本發明人為了實現上述目的而進行實驗和檢討的結果，得知在切斷加工後的早期，於切斷端面的板厚方向上顯現的第一塌邊的長度和在平面方向上顯現的第二塌邊的長度，對於在切斷加工後的端面(以下，有時也稱為「切斷端面」)上的鐵銹產生有很大的影響。再者，所達成的結論是，將這些值控制在規定範圍內，藉此抑制在切斷端面上產生鐵銹，而能夠大幅提升耐腐蝕性。其要旨如下述。[Technical Means for Solving the Problem] The inventors conducted experiments and reviews in order to achieve the above object, and learned that the length and length of the first sag appearing in the thickness direction of the cut end surface early after the cutting process The length of the second sag that appears in the plane direction has a great influence on the rust on the end surface after cutting (hereinafter sometimes referred to as "cutting end surface"). Furthermore, the conclusion reached is that by controlling these values within a prescribed range, the generation of rust on the cut end face is suppressed, and the corrosion resistance can be greatly improved. The gist is as follows.
(1)一種切斷端面的耐腐蝕性優異的零件，其包含被切斷加工後的表面處理鋼板的切斷端面，其中，前述切斷端面的形狀，其在板厚方向上顯現的第一塌邊的長度是前述表面處理鋼板的板厚的0.10倍以上，且在平面方向上顯現的第二塌邊的長度是前述表面處理鋼板的板厚的0.45倍以上，並且，前述切斷端面的表面，其藉由已覆蓋在該表面處理鋼板的表面上的鍍覆金屬層的包繞，而被該鍍覆金屬層覆蓋。(1) A part having excellent corrosion resistance of a cut end face, which includes a cut end face of a surface-treated steel sheet after being cut, wherein the shape of the cut end face is first in the thickness direction The length of the sag is 0.10 times or more of the thickness of the surface-treated steel sheet, and the length of the second sag that appears in the plane direction is 0.45 times or more of the thickness of the surface-treated steel sheet, and the The surface is covered by the plated metal layer by being wrapped around the plated metal layer that has been coated on the surface of the surface-treated steel sheet.
(2)一種切斷加工方法，是使用由模具和沖頭所構成之金屬模具來對表面處理鋼板進行切斷加工的方法，其中，用來進行切斷的該金屬模具，其將模具與沖頭之間的間隙設為前述表面處理鋼板的板厚的1～20%，且在模具和沖頭的至少一方的肩部上賦予有前述表面處理鋼板的板厚的0.12倍以上的曲率半徑，並且，切斷加工後的切斷端面的形狀，其在板厚方向上顯現的第一塌邊的長度是前述表面處理鋼板的板厚的0.10倍以上，且在平面方向上顯現的第二塌邊的長度是前述表面處理鋼板的板厚的0.45倍以上。(2) A cutting method is a method of cutting a surface-treated steel sheet using a metal mold composed of a die and a punch, wherein the metal mold used for cutting The gap between the heads is set to 1 to 20% of the thickness of the surface-treated steel sheet, and at least one shoulder of the die and the punch is provided with a radius of curvature of 0.12 times or more the thickness of the surface-treated steel sheet. In addition, the shape of the cut end surface after the cutting process has a length of the first collapse edge appearing in the plate thickness direction that is 0.10 times or more the thickness of the surface-treated steel sheet, and a second collapse edge appearing in the plane direction The length of the side is 0.45 times or more the thickness of the surface-treated steel sheet.
[發明的效果] 如以上說明，依據本發明，能夠提供一種切斷端面的耐腐蝕性優異的零件，即便在將表面處理鋼板作為材料的情況下，在進行切斷加工後的切斷端面，耐腐蝕性優異。[Effects of the Invention] As described above, according to the present invention, it is possible to provide a part having excellent corrosion resistance of a cut end surface, even when a surface-treated steel sheet is used as a material, the cut end surface after cutting processing, Excellent corrosion resistance.
本發明人使表面處理鋼板的板厚、切斷加工的條件、表面處理條件等在各種範圍內變化來進行實驗，並調查在切斷端面上的鐵銹產生狀況與切斷端面的形狀等的關係。其結果，得知針對切斷端面的塌邊的長度，如果以將第一塌邊的長度設在板厚的0.10倍以上的範圍內，並將第二塌邊的長度設在板厚的0.45倍以上的範圍內的方式來進行切斷加工，則能夠抑制隨著切斷加工後的時間經過而在切斷端面上產生鐵銹的情況。The inventors carried out experiments by varying the thickness of the surface-treated steel sheet, the conditions of the cutting process, the conditions of the surface treatment, etc. in various ranges, and investigated the relationship between the generation of rust on the cut end surface and the shape of the cut end surface, etc. . As a result, it is known that if the length of the sag at the cut end face is set, the length of the first sag is set to be within a range of 0.10 times or more of the plate thickness, and the length of the second sag is set to 0.45 of the plate thickness By performing the cutting process within a range of more than twice, it is possible to suppress the occurrence of rust on the cut end surface as the time after the cutting process elapses.
此處，切斷加工，是使用剪切手段來進行的切斷、沖壓、打孔等。第2圖示意地繪示切斷加工後的鋼板的剖面形狀。如第2圖所示，在進行切斷加工後的切斷端面上形成有第一塌邊9、第二塌邊10、剪切面11及破斷面12。其中，第一塌邊9和第二塌邊10，是隨著沖頭朝向鋼板行進，拉伸力作用在鋼板的表面上而使鋼板的表面變形而形成的塌邊。本說明書中，將在鋼板的板厚方向上顯現的第一塌邊9稱為「塌邊Z」，將在平面方向上顯現的第二塌邊10稱為「塌邊X」。Here, the cutting process refers to cutting, punching, punching, etc. using shearing means. FIG. 2 schematically shows the cross-sectional shape of the steel plate after cutting. As shown in FIG. 2, the
在這種條件下進行表面處理鋼板的剪切加工，藉此使得施加在鋼板上的拉伸力與剪切力一起提高，於是覆蓋在鋼板材料的表面上的鍍覆金屬層包繞在切斷端面上。這樣一來，藉由鍍覆金屬層的包繞，切斷端面當中的剪切面的至少一部分被覆蓋，此覆蓋的鍍覆金屬層產生犧牲防腐蝕作用，所以可抑制在切斷端面上產生鐵銹。Under such conditions, the surface-treated steel sheet is sheared, whereby the tensile force applied to the steel sheet is increased together with the shearing force, so the plated metal layer covering the surface of the steel sheet material is wrapped to cut End face. In this way, by covering the plated metal layer, at least a part of the cut surface of the cut end surface is covered, and the covered plated metal layer has a sacrificial anticorrosive effect, so the generation on the cut end surface can be suppressed rust.
如第3圖所示，此時的鍍覆金屬8包繞在切斷端面上的長度L，沿著表面處理鋼板的厚度方向，被定義為包含鍍覆金屬層8的厚度之塌邊Z(第一塌邊9)的厚度、及包繞在剪切面11上的鍍覆金屬層的長度的合計值。As shown in FIG. 3, the length L of the
如第2圖所示的塌邊Z(第一塌邊9)和塌邊X(第二塌邊10)的長度的上限，能夠對應於鋼板的板厚T和剪切加工的條件來適當地設定。其中，塌邊Z的長度的上限，較佳是板厚的0.40倍以下，更佳是板厚的0.25倍以下。又，塌邊X的長度的上限，較佳是板厚的1.50倍以下，更佳是板厚的1.00倍以下。The upper limit of the length of the sag Z (first sag 9) and the sag X (the second sag 10) shown in FIG. 2 can be appropriately adjusted according to the thickness T of the steel plate and the conditions of the shear processing set up. Among them, the upper limit of the length of the sag Z is preferably 0.40 times or less the plate thickness, and more preferably 0.25 times or less the plate thickness. In addition, the upper limit of the length of the sag X is preferably 1.50 times or less the plate thickness, and more preferably 1.00 times or less the plate thickness.
依據本發明，以將塌邊的長度設在前述的範圍內的方式來控制切斷端面的形狀，藉此促進拉伸力所造成的鍍覆金屬的變形和移動，使得鍍覆金屬朝向切斷端面的包繞量變多，所以鍍覆金屬覆蓋切斷端面的區域也擴大。這樣一來，能夠提升切斷端面的初期耐腐蝕性。當塌邊的長度更小時，鍍覆金屬的變形和移動變少而造成鍍覆金屬朝向切斷端面包繞不夠充分。According to the present invention, the shape of the cut end face is controlled in such a manner that the length of the sag is set within the aforementioned range, thereby promoting the deformation and movement of the plated metal due to the tensile force, so that the plated metal is oriented toward cutting The amount of wrapping on the end surface increases, so the area where the plated metal covers the cut end surface also expands. In this way, the initial corrosion resistance of the cut end surface can be improved. When the length of the sag is smaller, the deformation and movement of the plated metal become less, causing the plated metal to wrap around the cut end insufficiently.
此處，雖然塌邊的長度的控制，能夠容易地利用切斷工具的間隙和金屬模具的肩部的曲率半徑的改變來進行，但是也能夠藉由金屬模具移動的切斷速度(沖壓速度)等條件的改變等來進行。Here, although the control of the length of the sag can be easily performed by changing the gap of the cutting tool and the radius of curvature of the shoulder of the mold, the cutting speed (pressing speed) that can be moved by the mold can also be used Wait for changes in conditions to proceed.
(表面處理鋼板) 作為本發明中所使用的表面處理鋼板，較佳是使用在表面上施加有鍍覆之鋼板。此處的鍍覆，舉例有Zn類、Zn-Al(鋁)類、Zn-Al-Mg(鎂)類、Zn-Al-Mg-Si(矽)類的金屬鍍覆或合金鍍覆。其中，較佳是使用已施加有Zn-Al-Mg類的合金鍍覆之鋼板。此處，作為合金鍍覆，其相對於鍍覆的全部莫耳數，較佳是含有80質量%的鋅，更佳是含有90質量%以上。(Surface-treated steel sheet) As the surface-treated steel sheet used in the present invention, it is preferable to use a steel sheet to which a plating is applied on the surface. The plating here is exemplified by Zn-based, Zn-Al (aluminum)-based, Zn-Al-Mg (magnesium)-based, Zn-Al-Mg-Si (silicon)-based metal plating or alloy plating. Among them, it is preferable to use a steel plate to which Zn-Al-Mg-based alloy plating has been applied. Here, the alloy plating preferably contains 80% by mass of zinc relative to the total number of moles of plating, and more preferably contains 90% by mass or more.
此處，在表面處理鋼板上的鍍覆的附著量，其下限較佳是60 g/m2 ，更佳是90 g/m2 ；又，其上限較佳是450 g/m2 ，更佳是190 g/m2 。特別是，如果將在表面處理鋼板上的鍍覆的附著量設為90 g/m2 以上，則鍍覆金屬容易包繞在切斷端面上，所以能夠提升剪切加工後的耐腐蝕性。Here, the lower limit of the coating adhesion on the surface-treated steel sheet is preferably 60 g/m 2 , more preferably 90 g/m 2 ; and the upper limit thereof is preferably 450 g/m 2 , more preferably It is 190 g/m 2 . In particular, if the adhesion amount of the plating on the surface-treated steel sheet is 90 g/m 2 or more, the plated metal is easily wrapped around the cut end surface, so the corrosion resistance after shearing can be improved.
本發明，即便使用板厚大的表面處理鋼板，也能夠得到切斷端面的耐腐蝕性優異的零件。切斷加工所使用的表面處理鋼板的板厚，能夠基於想要製作的零件的形狀、機械強度、重量等來適當地設定。例如，即便使用板厚超過2.0mm的表面處理鋼板，也能夠使鍍覆金屬充分地包繞在切斷端面上，並將切斷端面覆蓋，所以能夠提升切斷加工後的耐腐蝕性。According to the present invention, even if a surface-treated steel plate having a large plate thickness is used, a part having excellent corrosion resistance at the cut end surface can be obtained. The thickness of the surface-treated steel sheet used for the cutting process can be appropriately set based on the shape, mechanical strength, weight, etc. of the parts to be produced. For example, even if a surface-treated steel plate with a thickness of more than 2.0 mm is used, the plated metal can be sufficiently wrapped around the cut end surface and the cut end surface can be covered, so the corrosion resistance after cutting can be improved.
(切斷加工) 對於表面處理鋼板之切斷加工，能夠使用由模具與沖頭所構成之金屬模具來進行。此處，第1圖的(a)、(b)繪示藉由金屬模具2、3(沖頭2與模具3)來對表面處理鋼板1進行切斷加工的狀態。如第1圖的(a)、(b)所示，被模具3與壓料板5挾持的表面處理鋼板1，藉由沖頭2的壓入而被剪切，因而得到分離後的零件7。模具3的肩部(第1圖的(a))與沖頭2的肩部(第1圖的(b))當中的至少一方，較佳是作成賦予有曲率半徑之彎曲形狀。(Cutting process) The cutting process of the surface-treated steel sheet can be performed using a metal mold composed of a die and a punch. Here, (a) and (b) of FIG. 1 show the state where the surface-treated steel sheet 1 is cut by the
金屬模具中的模具3與沖頭2的至少一方的肩部，如果將其與表面處理鋼板接觸的部分作成彎曲形狀，則當進行切斷加工時，鋼板會沿著模具3的肩部或沖頭2的肩部而變形，所以鋼板容易往平面方向被拉伸而有助於塌邊X和塌邊Z的增大。因此，賦予在金屬模具上的曲率半徑，較佳是表面處理鋼板的板厚的0.12倍以上。例如，第1圖的(b)的實施形態的例子所使用的金屬模具，其沖頭2的肩部作成彎曲形狀。隨著該沖頭2的壓入，在被模具3與壓料板5挾持的一側的表面處理鋼板，容易產生上述的鋼板表面的變形，於是鍍覆金屬包繞在其切斷端面上的情況會被促進，而可得到切斷端面的耐腐蝕性良好的零件7。第2圖所示的示意圖，相當於第1圖的(b)的右側位置之零件7的切斷端面。當使用如第1圖的(a)所示的金屬模具，其模具3的肩部作成彎曲形狀的情況，則在落入模具3的打孔側之零件7的切斷端面上，容易產生上述的鋼板表面的變形，於是鍍覆金屬的包繞被促進，而可得到切斷端面的耐腐蝕性良好的零件7。If at least one of the shoulders of the
又，賦予在金屬模具上的曲率半徑的上限，較佳是表面處理鋼板的板厚的0.50倍以下，更佳是0.30倍以下。In addition, the upper limit of the radius of curvature given to the metal mold is preferably 0.50 times or less of the thickness of the surface-treated steel sheet, and more preferably 0.30 times or less.
在金屬模具中的模具與沖頭之間的間隙，較佳是表面處理鋼板的板厚的20%以下。藉此，能夠使沖頭2對於鋼板之剪切力變大，所以塌邊Z容易變大。另一方面，模具與沖頭之間的間隙，從容易使鋼板往平面方向上被拉伸而使塌邊X容易變大的觀點來看，較佳是表面處理鋼板的板厚的1%以上，更佳是3%以上。
The gap between the die and the punch in the metal die is preferably 20% or less of the thickness of the surface-treated steel plate. With this, the shear force of the
金屬模具對於表面處理鋼板的沖壓速度，能夠基於模具與沖頭之間的間隙來設定，該沖壓速度的下限，較佳是10mm/s以上，更佳是20mm/s以上。另一方面，金屬模具對於表面處理鋼板的沖壓速度的上限，較佳是200mm/s以下，更佳是120mm/s以下。 The stamping speed of the metal mold for the surface-treated steel sheet can be set based on the gap between the die and the punch. The lower limit of the stamping speed is preferably 10 mm/s or more, and more preferably 20 mm/s or more. On the other hand, the upper limit of the stamping speed of the metal mold for the surface-treated steel sheet is preferably 200 mm/s or less, and more preferably 120 mm/s or less.
所使用的表面處理鋼板，是鍍覆有Zn-6質量%的Al-3質量%的Mg類的合金鍍覆之鋼板，其板厚是0.8、1.2、2.3、3.2、4.5、6.0(mm)，鍍覆的附著量是90、190(g/m2)。切斷加工，使用一邊的長度是40mm的方形的模具3、及對應於間隙來改變邊長之沖頭2，且藉由壓料板5來保持表面處理鋼板1。此時，模具3的肩部與沖頭2的肩部的至少一方是作成賦予有曲率半徑4之彎曲形狀。
The surface-treated steel plate used is a steel plate plated with Zn-6% by mass of Al-3% by mass of Mg alloy plating, and its plate thickness is 0.8, 1.2, 2.3, 3.2, 4.5, 6.0 (mm) The adhesion amount of plating is 90 or 190 (g/m 2 ). For the cutting process, a
針對剪切加工所得到的零件的形狀，測定塌邊Z與塌邊X的長度。又，針對朝向切斷端面的包繞，利用顯微鏡來觀察零件的直線狀的側邊部的中央部分的剖面，並在表面處理鋼板的厚度方向上測定鍍覆金屬包繞在端面上的長度L。另外，如第1圖的(a)、(b)的零件7所示，所測定的樣本是位於具有曲率之模具或沖頭的相對側的位置並藉由切斷加工而分離後的表面處理鋼板。The length of the sag Z and the sag X was measured for the shape of the part obtained by the shearing process. In addition, regarding the wrapping toward the cut end surface, the cross section of the central portion of the linear side portion of the part was observed with a microscope, and the length L of the plated metal wrapped around the end surface was measured in the thickness direction of the surface-treated steel plate . In addition, as shown in
將進行切斷加工而得到的零件放在屋外進行大氣暴露實驗，直到在切斷端面上觀察到產生顯眼的鐵銹為止的天數是15日。其結果如表1所示。在表1中，一併表示各零件所使用的表面處理鋼板和切斷加工等的條件。此處，金屬模具的曲率半徑(板厚比)，是以板厚除以被賦予在模具3的肩部或沖頭2的肩部上的圓弧的半徑而得。故意不賦予圓弧的模具或沖頭，在此欄中標記為「＜0.01」，並且在「已賦予曲率之金屬模具」的欄中標記為「無」。在本發明例13中，在模具和沖頭的兩方上都賦予板厚比的曲率半徑是0.14的圓弧。The part obtained by performing the cutting process was placed outdoors to perform an atmospheric exposure test, and the number of days until the generation of conspicuous rust was observed on the cut end surface was 15 days. The results are shown in Table 1. In Table 1, the conditions of the surface-treated steel plate used for each part, cutting processing, etc. are shown together. Here, the radius of curvature (plate thickness ratio) of the metal mold is obtained by dividing the plate thickness by the radius of the arc given to the shoulder of the
如表1所示，相當於本發明之本發明例1～15，其在板厚方向上顯現的塌邊Z的長度是表面處理鋼板的板厚的0.10倍以上，且在平面方向上顯現的塌邊X的長度是表面處理鋼板的板厚的0.45倍以上。其切斷端面呈現直到90日以上才會產生鐵銹之良好的耐腐蝕性。又，本發明例1～15，其相對於板厚([A])之鍍覆金屬的包繞長度L([B])的比率也就是[B]／[A]值是在0.30以上的較高的範圍。As shown in Table 1, it corresponds to Inventive Examples 1 to 15 of the present invention, and the length of the sag Z appearing in the thickness direction is 0.10 times or more the thickness of the surface-treated steel plate and appears in the planar direction The length of the sag X is 0.45 times or more the thickness of the surface-treated steel sheet. The cut end face exhibits good corrosion resistance that will not produce rust until 90 days or more. In addition, in Examples 1 to 15 of the present invention, the ratio of the wrapping length L ([B]) of the plated metal of the plate thickness ([A]), that is, the value of [B]/[A] is 0.30 or more Higher range.
相對於此，比較例1、2、4、5，其塌邊Z未滿0.10，所以直到切斷端面產生鐵銹為止的天數小於90日，相較於本發明例，比較例1、2、4、5的耐腐蝕性較差。推測這是因為這些比較例，其在金屬模具上沒有設置圓弧(曲率)，使得塌邊Z減少而造成的結果。In contrast, in Comparative Examples 1, 2, 4, and 5, the sag Z is less than 0.10, so the number of days until rust occurs on the cut end surface is less than 90 days. Compared to the present example, Comparative Examples 1, 2, and 4 , 5 has poor corrosion resistance. It is presumed that this is because these comparative examples have no arc (curvature) provided on the metal mold, resulting in a decrease in the sag Z.
比較例3，其塌邊X未滿0.45，所以直到切斷端面產生鐵銹為止的天數小於90日，相較於本發明例，比較例3的耐腐蝕性較差。又，比較例1～5，其相對於板厚之鍍覆金屬的包繞長度L的比率也就是([B]／[A])是在未滿0.30的範圍。In Comparative Example 3, the sag X was less than 0.45, so the number of days until rust occurred on the cut end surface was less than 90 days. Compared with the example of the present invention, Comparative Example 3 had poor corrosion resistance. Also, in Comparative Examples 1 to 5, the ratio of the wrapping length L of the plated metal to the plate thickness, that is, ([B]/[A]) is in the range of less than 0.30.
依據以上敘述，確認將切斷端面的形狀當中的塌邊Z和塌邊X的兩方的長度設為規定以上的範圍，藉此能夠得到具有良好的耐腐蝕性的切斷端面。Based on the above description, it was confirmed that the length of both of the sag Z and the sag X in the shape of the cut end face is set to a predetermined range or more, whereby a cut end face having good corrosion resistance can be obtained.
[表1]
1:表面處理鋼板 1: Surface treated steel plate
2:沖頭 2: punch
3:模具 3: mold
4:賦予在模具的肩部或沖頭的肩部上的曲率半徑 4: The radius of curvature given to the shoulder of the die or the shoulder of the punch
5:壓料板 5: pressure plate
6:間隙 6: clearance
7:零件 7: Parts
8:鍍覆金屬層 8: plating metal layer
9:塌邊Z(第一塌邊) 9: Collapse Z (First Collapse)
10:塌邊X(第二塌邊) 10: Collapse X (Second Collapse)
11:剪切面 11: shear plane
12:破斷面 12: Broken section
L:鍍覆金屬的包繞長度 L: wrapped length of plated metal
T:板厚 T: Thickness
第1圖是本發明的切斷加工的一實施形態，其中，(a)是說明在模具的肩部上賦予有曲率半徑的切斷加工方法的示意圖，(b)是說明在沖頭的肩部上賦予有曲率半徑的切斷加工方法的示意圖。 第2圖是用來說明切斷端面的塌邊Z和塌邊X之示意剖面圖。 第3圖是用來說明鍍覆金屬包繞在切斷端面上的長度L之示意剖面圖。Fig. 1 is an embodiment of the cutting process of the present invention, wherein (a) is a schematic diagram illustrating a cutting process method in which a radius of curvature is given to a shoulder of a die, and (b) illustrates a shoulder on a punch A schematic diagram of a cutting method with a radius of curvature given to the part. FIG. 2 is a schematic cross-sectional view for explaining the sag Z and the sag X of the cut end surface. FIG. 3 is a schematic cross-sectional view for explaining the length L of the plated metal wrapped around the cut end surface.
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1‧‧‧表面處理鋼板 1‧‧‧Surface treated steel plate
7‧‧‧零件 7‧‧‧Parts
9‧‧‧塌邊Z(第一塌邊) 9‧‧‧collapse Z (first collapse)
10‧‧‧塌邊X(第二塌邊) 10‧‧‧collapse X (second collapse)
11‧‧‧剪切面 11‧‧‧Shear plane
12‧‧‧破斷面 12‧‧‧broken section
T‧‧‧板厚 T‧‧‧Thickness
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1131774A (en) * | 1997-07-10 | 1999-02-02 | Nec Corp | Cutting device for metal plate |
| CN101018627A (en) * | 2004-09-15 | 2007-08-15 | 新日本制铁株式会社 | High-strength part and process for producing the same |
| JP2015157314A (en) * | 2014-02-25 | 2015-09-03 | 日新製鋼株式会社 | PUNCHING METHOD OF Zn BASED GALVANIZED STEEL SHEET |
| CN105636718A (en) * | 2013-11-13 | 2016-06-01 | 新日铁住金株式会社 | Steel plate punching tool and punching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1131774A (en) * | 1997-07-10 | 1999-02-02 | Nec Corp | Cutting device for metal plate |
| CN101018627A (en) * | 2004-09-15 | 2007-08-15 | 新日本制铁株式会社 | High-strength part and process for producing the same |
| CN105636718A (en) * | 2013-11-13 | 2016-06-01 | 新日铁住金株式会社 | Steel plate punching tool and punching method |
| JP2015157314A (en) * | 2014-02-25 | 2015-09-03 | 日新製鋼株式会社 | PUNCHING METHOD OF Zn BASED GALVANIZED STEEL SHEET |
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