【導(dǎo)讀】料、棒料、管材和型材彎曲成一定角度和形狀的沖壓成形工序。具工藝設(shè)計和結(jié)構(gòu)設(shè)計，從而確定總體的模具形式。即先通過級進(jìn)模進(jìn)行落料、沖孔和一次彎曲成形，再經(jīng)過單工序彎曲模進(jìn)行二次彎曲成形即可。后的模具設(shè)計提供寶貴的經(jīng)驗。進(jìn)模的設(shè)計方法，并在實(shí)際生產(chǎn)中應(yīng)用。沖模設(shè)計水平將直接影響到產(chǎn)品的質(zhì)量、生產(chǎn)效率、生產(chǎn)成本與操作。而本次畢業(yè)設(shè)計的目的在于培養(yǎng)學(xué)生的實(shí)踐操作能力，在于驗證理論。道路中會更成熟、理性。復(fù)雜的，具有沖裁、彎曲、拉深等多工序的沖壓零件可在一副模具上完成。級進(jìn)沖模較一般沖壓模具而言，結(jié)構(gòu)較為復(fù)雜，其制造難度及精度要求相對較高，制造周期較長，因而對模具設(shè)計及工藝編排專業(yè)人員的要求更高。料；二次送料級進(jìn)模，其原材料為半成品的落料件。而本次畢業(yè)設(shè)計主要針對一。較為詳細(xì)的介紹了在設(shè)計級進(jìn)模的過程中，如何針對不同

　　

【正文】 敬禮和深深的感謝！ 當(dāng)然還有那些在這三年的大學(xué) 生涯 中傳授我知識的 各位老師們，是你們傳授了我知識，我才有今天的成果。 最后，我衷心的祝愿方 老師和各位老師 工作順利， 身體健康，萬事如意！ 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 31 參考文獻(xiàn) [1] 沖壓成形工藝與模具設(shè)計 /李奇涵主編 .— 北京：科學(xué)出版社， 2021 [2] 互換性與測量技術(shù)基礎(chǔ) /陳于萍，周兆元主編 .— 2 版 .— 北京：機(jī)械工業(yè)出版社， （ 重?。? [3] 沖模實(shí)用典型結(jié)構(gòu)圖集 / 張正修主編 .— 北京：機(jī)械工業(yè)出版社， [4] 簡明模具工實(shí)用技術(shù)手冊 /彭建聲主編 .— 3 版 .— 北京：機(jī)械工業(yè)出版社， [5] 級進(jìn)沖模設(shè)計與模具結(jié)構(gòu)實(shí)例 /姜伯軍編著 .— 北京：機(jī)械工業(yè)出版社， （ 重?。? [6] 機(jī)械制圖及 AutoCAD 繪圖 /王定保主編 .— 北京：人民郵電出版社， [7] 冷沖壓及塑料成型工藝與模具設(shè)計資料 /虞傳寶主編 .— 北京：機(jī)械工業(yè)出版社， 1992 [8] 模具制造工藝學(xué) /譚海林等主編 .— 長沙：中南大學(xué)出版社 ， [9] 模具設(shè)計與制造專業(yè)英語 /王曉江主編 .— 2 版 .— 北京：機(jī)械工業(yè)出版社， ( 重印 ) [10] CAD 工 程 設(shè)計 /梁俊有，李洪波主編 .— 呼和浩特：遠(yuǎn)方出版社， [11] 沖壓與塑料成型設(shè)備 /程燕軍，柳舟通主編 .— 北京：科學(xué)出版社，2021 [12] 機(jī)械工程材料 /呂燁，許德珠主編 .— 3 版 .— 北京：高等教育出版社， [13] Pro/ENGINEER Wildfire 中文版教程 /孫小撈，邱玉江主編 .— 2版 .— 北京：人民郵電出版社， （ 重?。? [14] 多工位級進(jìn)模設(shè)計與制造 /陳炎嗣 編著 .— 北京：機(jī)械工業(yè)出版社，（ 重印） [15] 計算機(jī)應(yīng)用基礎(chǔ) /姚旭東，李孜主編 .— 武漢：武漢理工大學(xué)出版社， 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 32 外文資料 Blanking Technique Cutting (Shearing) Operations In the following discussion, certain die terminology will be used frequently. Figure 81 presents the terms most monly encountered. Figure 81 Common ponents of a simple die Figure 82 Stresses in die cutting Shear Action in Die Cutting Operations The cutting of metal between die ponents is a shearing in which the metal is stressed in shear between two cutting edges to the point of fracture, or beyond its ultimate strength. 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 33 The metal is subjected to both tensile and pressive stresses (figure 82)。 stretching beyond the elastic limit occurs, then plastic deformation, reduction in area, and finally, fracturing starts through cleavage planes in the reduced area and bees plete. The fundamental steps in shearing or cutting are shown in figure 83. the pressure applied by the punch on the metal tends to deform it into the die opening. When the elastic limit is exceeded by further loading, a portion of the metal will be forced into the die opening in the form of an emb ossed pad on the lower face of the material. A corresponding depression results on the upper face, as indicated at figure 83a. as the load is further increased, the punch will perate the metal to a certain depth and force an equal portion of metal thickness into the die, as indicated at figure 83b. this peration occurs before fracturing starts and reduces the crosssectional area of metal through which the cut is being made. Fracture will start in the reduced area at both upper and lower cutting edges, as indicated at figure 83c. if the clearance is suitable for the material being cut, these fractures will spread toward each other and eventually meet, causing plete separation. Further travel of the punch will carry the cut portion through the stock and into the die opening. Figure 83 Steps in shearing metal a) Plastic deformation b) Reduction in thickness c) Fracture Center of Pressure If the contour to be blanked is irregularly shaped, the summation of shearing forces on one side of the center of the ram may greatly exceed the 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 34 forces on the other side. Such irregularity results in a bending moment in the press ram, and undesirable deflections and misalignment. It is therefore necessary to find a point about which the summation of shearing forces will be symmetrical. This point is called the center of pressure, and is the center of gravity of the line that is the perimeter of the blank. It is not the center of gravity of the area. The press tool will be designed so that the center of pressure will be on the axis of the press ram when the tool is mounted in the press. Clearances Clearances is the space between the mating members of s die set. Proper clearance between cutting edges enable the fractures to meet. The fractured portion of the sheared edge will have a clean appearance. For optimum finish of a cut edge, proper clearance is necessary and is a function of the type, thickness, and temper of the work material. Clearance , peration, and fracture are shown schematically. The upper corner of the cut edge of the stock (indicated by A) and the lower corner of the blank (indicated by A1) will have a radius where the punch and die edges, respectively, make contact with the material. This radiusing is due to the plastic deformation taking place, and will be more pronounced when cutting soft metals. Excessive clearance will cause a large radius at these corners, as well as a burr on opposite corners. Figure 84 Punchanddie clearance。 punch peration into 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 35 and fracture of diecut metal Figure 85 Cutedge characteristics of diecut metal。 effect of excessive insufficient clearances a excessive clearance b) insufficient c) normal clearance Cutting Forces The force required to cut ( shear ) the work material can be calculated by using the following formulas。 2021 SL TTNorSL TP ?? ( for contours) 2021 D STTNorD STP ?? ?? ( for round holes) Stripping forces The force required to strip the work material off punches can be calculated by using the following formulas: 20213500 3500s LTTNLTP ?? ( for contours) 20213500 3500s DTTNDTP ?? ?? ( for round holes) Where 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 36 i n c h e s .i n Di a m e t e r i n c h e s 。i n m a t e r i a l of T h i c k n e s si n c h e s 。i n c u t ofL e n g t h i n c h 。 s q u a r ep e r p o u n d si n s t r e n g h S h e a r i n t o n s 。 f o r c e S t r i p p i n gp o u n d s 。i n f o r c e S t r i p p i n gi n t o n s 。 f o r c e C u t t i n gp o u n d s 。i n f o r c e C u t t i n gss????????DTLSTNPTNP Press Tonnage This is a total of forces required to cut and form the part with a %30 safety added. In many cases, you will have to add stripping is bein