1、(4)材料硬度高:一般采用工具钢淬火、低温回火,需要采用特种加工方法。关键词:模具 冲裁 弯曲 工艺 指导老师签名:Block lock parts of car stamping prodess and die design Abstract: Mold is an important technique and equipment in modern industrial production, In this paper, the main process involved in design of stamping die and design of bending mold,the
2、entire process including planning of process, organization of process, size of process, use of equipment and types of mold. And in accordance to the size of convex and concave mold and the its technical requirements complete the development of its machining process planning, eventually draw the corr
3、ect assembling drawing of blanking dies and bending .According to the technical requirements of parts, Technology program is determined to blanking firstly and then bending. In the Stage of blanking process, The development of blanking and punching two programs: one is the composite blanking and pun
4、ching; anther is blank firstly then punch. Through calculation and comparison of various aspects, the first program was to identify better.In the Stage of bending. As the deformation zone be in near of the order to meet the technical requirements.In the manufacturing process of Bump of Blanking Die,
5、 mold manufacturing is compared with the general machinery manufacturing, as a result of its special technical requirements and it clear features,wo Must be treated differently.(1) One-piece production:Generlly,each mold product for 12, Widely used processing of file repair, repair methods, combinat
6、ion of the process of relative concentration and demand the workers of general, the manufacturing of mold parts products are more precision than 2 to 4 general tool steel need to =0.246mm Zmax=0.360mm .3.1.6 冲裁模刃口尺寸的计算模具刃口如图3-1.5所示,尺寸计算: 图3-1.5(1) 落料计算公式: Dd=(Dmax-x)+d0 Dp=(D凹-Zmin)-p0=(D-x-Zmin)-p0
7、查表得: Zmin=0.22mm Zmax=0.26mm X1=1 1p=-0.020 1d=+0.025 X2=1 2p=-0.020 2d=+0.020 X3=1 3p=-0.020 3d=+0.020所以可得: D1d=(26-10.13)+0.0250 =25.87+0.0250 D1p=(26-10.13-0.22)-0.0200=25.65-0.0200 D2d=(18-10.11)+0.0200 =17.89+0.0200 D2p=(18-10.11-0.22)-0.0200=17.67-0.0200 D3d=(10-10.15)+0.0200 =9.85+0.0200 D3p=
8、(10-10.15-0.22)-0.0200=9.63-0.0200(2) 冲孔 计算公式: dp=(dmin+x)-p0 dd=(dp+Zmin)+d0=(dmin+ x+Zmin)+d0 查表得: x1=0.7 1p=-0.020 1d=+0.020 X2=0.7 2p=-0.020 2d=+0.020 所以得: d1p=(6+0.70.12)-0.0200=6.08-0.0200 d1d=(6+0.70.12+0.22)+0.0200=6.3+0.0200 d2p=(15.5+0.70.18)-0.0200=15.63-0.0200 d2d=(15.5+0.70.18+0.22)+0.0
9、200=15.85+0.0200 (3) 孔心距: 计算公式: Ld=(Lmin+0.5)0.125 可得: L1d=(15.88+0.50.24) 0.1250.24=160.03 L2d=(4.88+0.50.24=5 L3d=(11.88+0.50.24=123.2 设计各主要零件结构尺寸3.2.1 凹模外形尺寸的设计:凹模高度H的确定:H=KB=0.2890=25.2mm 取 H=30 mm凹模壁厚C的确定:C=(1.52)H,取 C=1.530=45凹模的长度L的确定:L=b2C=180mm 凹模的宽度B的确定:B=a+2C=116mm根据参考资料3确定凹模外形尺寸为:200mm12
10、5mm30mm。根据参考资料3凹模螺孔选用d=M6根据参考资料3 查得,凹模螺孔间距为25mm-70mm凹模上螺孔到凹模外缘的最小距离a1=1.25d=1.256=7.5mm 选用a1=12mm螺孔到凹模孔、销孔距离的最小尺寸为bmin=1.3d=1.66=7.8mm凹模具体尺寸如下图(图3-2.1)所示: 图3-2.1计算出凹模的尺寸后便可以确定模架的选取.3.2.2 凸凹模外形尺寸设计图3-2.2在复合模中,必定有一个凸凹模。凸凹模的内外缘均为刃口,内外缘之间的壁厚决定与冲裁件的尺寸。从强度的考虑,壁厚受最小值的限制。凸凹模的最小壁厚与冲模结构有关,对于正装复合模,由于凸凹模装于上模,孔内
11、不会有积存废料,胀力小,最小壁厚可以小些;对于倒装复合模,因为孔内会积存废料,所以最小壁厚要大些。凸凹模的外形尺寸根据凹模来配做,总高度的设计H=50mm。详细尺寸和技术要求参见凸凹模的设计图。形状见图3-2.2。3.2.3 凸模外形尺寸的设计:一般的凸模组件结构包括凸模和凸模固定板、垫板和防转销等,并用螺钉销钉固定在上模座上。凸模刃口要有高的耐磨性,并能承受冲裁时的冲击力。因此应有高的硬度与适当的任性。形状简单的凸模常选用T8A、T10A等制造。凸模长度 L=l1+l2+l3+l其中:l1卸料板的厚度; l2-凸模固定板厚度; l3-导尺厚度 l -附加长度,一般取l=1520mm参考资料可
12、得,凸模尺寸如图3-2.3:图3-2.33.2.4 其他主要部件的选取:凸模固定板,用于固定凸模。固定板的外行尺寸一般与凹模大小一样,可由标准中查得。固定凸模用的形孔与凸模固定部分相适应。型孔位置应与凹模型孔位置协调一致。凸模固定板内凸模的固定方法通常是将凸模压入固定板内,其配合用H7m6,对于大尺寸的凸模,也可以直接用螺钉、销钉固定到模座上而不用固定板。对于小模具还可以用粘结固定。个模具主要零件标准如下:上模座 LmmBmmHmm=250mm45mm下模座 Lmm50mm导柱 dmmLmm=35mm160mm导套 dmmLmmDmm=35mm105mm43mm模架闭合高度: 170mm210
13、mm垫片厚度: 10mm凸模固定板厚度: 18mm卸料板厚度: 28mm3.2.5压力机的选取:开式双柱可倾压力机 J23-40 , 公称压力: 400KN滑块行程: 100mm最大闭合高度: 330mm连杆调节量: 65mm工作台尺寸: 460mm700mm垫板尺寸:(厚度孔径) 65mm200mm模柄孔尺寸:(直径深度)50mm70mm 最大倾斜角度: 303.3冲裁模装配图 图3.9 图3-2.4冲裁模装配图 1.导料销 2.固定挡料销 3.上模座 4.螺钉5.螺钉6.推杆 7.推板 8.推板9.推销 10.垫板11.螺栓12.导套13.凸模固定板14.推件板15.落料凹模模16.凸模 17.卸料板18.导柱 19.下模座 20.弹簧 21.凸凹模22.螺钉23.销钉 24.卸料螺钉4 弯曲模的设计4.1 弯曲件的工艺分析4.1.1 最小弯曲半径 rmin工件在弯曲弯曲时候,外层纤维受拉应力最大,内层受压应力最大,弯曲毛坯变形区外表面金属在切应力作用下,产生切向伸长变形可用下式表示: = t2 = 1(2rt+1)弯曲半径与材料厚度
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