【正文】 在許多情況下當(dāng)改變模具尺寸使它接近標(biāo)準(zhǔn)值,它們變得不穩(wěn)定甚至導(dǎo)致部分間更大的變化。當(dāng)整個(gè)系列的模具已準(zhǔn)備就緒，所有的模具必須設(shè)置在一條線上。 在任何平板翻邊中翻邊鋼材會(huì)影響回彈和側(cè)壁的卷曲。拉延筋的類型傳統(tǒng)的拉延筋 高強(qiáng)度拉延筋帶壓邊圈拉延模具,同時(shí)防止側(cè)壁的卷曲以及回彈。3度適用于低度鋼,但6度或以上適用于高強(qiáng)度鋼。吉 林 大 學(xué)本科畢業(yè)設(shè)計(jì) 翻譯 學(xué)生姓名：***** 班 級(jí)：*****班 學(xué) 號(hào)：***** 學(xué) 院：材料科學(xué)與工程學(xué)院 專 業(yè)：材料成型及控制工程 指導(dǎo)教師：***** 副教授 2011年3月25日吉林大學(xué)材料科學(xué)與工程學(xué)院本科生畢業(yè)設(shè)計(jì) 翻譯16吉林大學(xué)材料科學(xué)與工程學(xué)院本科生畢業(yè)設(shè)計(jì) 翻譯Section 4 – Die Design and Construction Guidelines for HSS DiesGeneral Guidelines for Die Design and ConstructionDraw DiesHigher than normal binder pressure and press tonnage is necessary with . in order to maintain process control and to minimize buckles on the binder. Dies must be designed for proper press type and size. In some cases, a double action press or hydraulic press cushion may be required toachieve the necessary binder forces and control. Air cushions or nitrogen cylinders may not provide the required force for setting of draw beads or maintaining binder closure if . is of higher strength or thickness.Draw beads for . should not extend around corners of the draw die. This will result in locking out the metal flow and cause splitting in corners of stamping. Draw beads should “run out” at the tangent of the corner radius to minimize metal pression in corners, as shown in figure 16 on page 47.Better grades of die material may be necessary depending on the characteristics of the HSS, the severity of the part geometry, and the production volume. A draw die surface treatment, such as chrome plating, may be remended for outer panel applications.Form and Flange DiesPart setup in form and flange dies must allow for proper overbend on all flanges for springback pensation. Springback allowance must be increased as material strength increases。 沖床半徑必須相當(dāng)尖銳。半徑應(yīng)該也小到可以減少邊緣的回彈。板料能在所有的模具連續(xù)操作。這功能建設(shè)理論評(píng)估零件變穩(wěn)定后可接受程度,在小尺寸上的進(jìn)行改變。盡管很多測(cè)試點(diǎn)偏離標(biāo)準(zhǔn)位置有的甚至超過偏差極限但在結(jié)果上它們尺寸上是一致的。這一現(xiàn)象的原因可能是時(shí)間滯后,通常一個(gè)板料之間發(fā)生的形成及其用于下一個(gè)操作。,但減小到使用時(shí)能減少側(cè)壁回彈。模具間隙應(yīng)該是7%到10%的金屬厚度?；貜棙O限必須隨材料強(qiáng)度增加而增加。 3 degrees for mild steels, but 6 degrees or more for HSS.Punch radii must be fairly sharp. 1t for lower strength steels. Higher strength steels may require larger radii, but keeping them as small as practical will reduce springback in the sidewalls. Flange steel die clearance must be held to no more than one metal thickness clearance to reduce springback and sidewall curl.Form a