公开(公告)号：KR1020080002324A

公开(公告)日：2008-01-04

申请号：KR1020060061087

申请日：2006-06-30

Applicant: 현대자동차주식회사

Inventor： 김익수

IPC: G01N3/30 ,  G01N3/00

CPC classification number: G01N3/30 ,  G01M7/08 ,  G01N2203/04

Abstract: A forming limit diagram testing device is provided to obtain an original forming limit diagram of a sample by minimizing a deformation degree and stress measuring difficulties by using the sample with regular width and by adapting various types of jigs to reproduce various deformation modes. A device for testing a forming limit diagram comprises a sample(20), an upper jig(11), and a friction preventing member(14). The sample has a united type of a regular circle which is allowed to be adapted in all deformation modes. The upper jig allows the all deformation modes by differentiating a pressurizing range when fixing the sample. The friction preventing member is inserted between an operation range of the sample and a punch(13). The type of the upper jig is set differently in first, second, third, and fourth modes. In the first mode, the type of the upper jig is a complete ring member with regular thickness, whose ratio between the long axis and the short axis, forming an inside of the upper jig is 5:5. In the second mode, the type of the upper jig is an oval ring member whose ratio between the long axis and the short axis is 5:4. In the third mode, the type of the upper jig is an oval ring member whose ratio between the long axis and the short axis is 5:3. In the fourth mode, the type of the upper jig is an oval ring member whose ratio between the long axis and the short axis is 5:2. The friction preventing member is made of silicon.

Abstract translation: 提供一种成形极限图测试装置，通过使用具有规则宽度的样品和通过适应各种类型的夹具来再现各种变形模式来最小化变形程度和应力测量困难来获得样品的原始成形极限图。 用于测试成形极限图的装置包括样品（20），上夹具（11）和防摩构件（14）。 样品具有统一的规则圆形，允许在所有变形模式下适应。 上夹具通过在固定样品时区分加压范围来允许所有变形模式。 防摩擦构件插入样品的操作范围和冲头（13）之间。 上夹具的类型在第一，第二，第三和第四模式中设置不同。 在第一模式中，上夹具的类型是具有规则厚度的完整环形构件，其长轴和短轴之间的比例形成上夹具的内部为5:5。 在第二模式中，上夹具的类型是其长轴和短轴之间的比率为5:4的椭圆环构件。 在第三模式中，上夹具的类型是长轴和短轴之间的比率为5:3的椭圆环构件。 在第四模式中，上夹具的类型是其长轴和短轴之间的比率为5：2的椭圆环构件。 防摩擦构件由硅制成。

公开(公告)号：KR1020070014788A

公开(公告)日：2007-02-01

申请号：KR1020050069710

申请日：2005-07-29

Applicant: 현대자동차주식회사

Inventor： 김익수

IPC: G01N3/28

CPC classification number: G01N3/28 ,  B21D22/20 ,  G01N2203/04

Abstract: A method of testing a limiting drawing ratio is provided to simultaneously measure wrinkle limitation of a press product and breakage limitation to reduce inferior goods. A method of testing a limiting drawing ratio is performed by using a cup drawing device. The method of testing the limiting drawing ratio includes the steps of fixing a plurality of specimen diameters and adjusting a blank holding force, measuring limitation of wrinkles generated when the blank holding force is weak, and simultaneously measuring breakage limitation generated when the blank holding force is strong. A point in which the wrinkle limitation and the breakage limitation meet each other is determined by the limiting drawing ratio. The blank holding force is calculated by dividing a maximum specimen diameter by a diameter of a punch.

Abstract translation: 提供一种测试限制拉伸比的方法，以同时测量冲压产品的皱纹限制和断裂限制，以减少劣质产品。 通过使用杯形拉拔装置进行限制拉伸比的测试方法。 测定限制拉伸比的方法包括固定多个试样直径和调整坯料夹持力的步骤，测量坯料保持力较弱时产生的皱纹的限制，同时测量坯料夹持力为零时产生的断裂限制 强大。 皱纹限制和断裂限制相遇的点由限制拉伸比决定。 通过将最大样品直径除以冲头的直径来计算坯料保持力。