欢迎来到天天文库
浏览记录
ID:60769700
大小:76.00 KB
页数:3页
时间:2020-12-16
《最新锻造练习题培训资料讲课讲稿.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、锻造练习题一、填空题1、锻件的材料是45钢,它的始锻温度是1200℃,终锻温度是800℃。2、锻件坯料加热的目的是为了提高金属的塑性,降低变形抗力,以利于金属的变形。3、在实习中使用的空气锤的规格是65公斤,它是指空气锤落下部分的质量为65公斤。4、锻件坯料在加热过程中可能产生的缺陷是过热、过烧、氧化、裂纹。5、锻造时,使坯料的横截面加大,高度减少的工序是镦粗,使坯料的横截面减小,长度增加的工序是拉长。6、截面为圆形的棒料拔长时,应先把坯料锻成方形再拔长;截面是方形的坯料镦粗时,应先把坯料锻成圆形再镦粗。二、选择题1、空气锤是用压缩空气作为动力的,这句话对吗?(A)
2、A对B不对C一般对2、锻造时过热的钢料用什么方法可以挽救?(A)A正火B回火C淬火3、下列加热缺陷中,哪些无法挽救?(B)A过热B过烧C氧化4、与铸造相比锻造的主要特点是:(C)A生产率高、成本低B操作简单,易生产大型零件C锻件力学性能较高5、锻造合金钢锻件,一般要求冷却快点还是慢点?(B)A快点B慢点C快点慢点都一样6、镦粗时,坯料的高度与直径之比应小于多少?(A)A2-2.5B2.5-3C3-3.5A992/A992M-04 建筑框架中使用的结构成型件钢规范 StandardSpecificationforStructuralSteelShapes马
3、钢热轧美标H型钢截面参数型号(高×宽)截面尺寸(mm)截面面积cm2理论重量Kg/m截面特性参数HBt1t2r惯性矩cm4惯性半径cm截面模量cm3IxIyixiyWxWyW27×84678.43252.9811.6816.2615.50159.78125.43118525.244397.2827.245.253494.08347.63W27×94683.77253.7512.4518.9215.50178.49140.11136205.155165.2027.625.383983.96407.12W27×102688.09254.3813.0821.0815.50
4、193.81152.14150816.895789.1027.905.474383.66455.86W27×114693.17255.7814.4823.6215.50216.42169.89170103.236606.8928.045.534908.01516.61W27×129701.80254.2515.4927.9415.50244.22191.71198282.757676.6128.495.615650.68603.85W27×146695.45354.7115.3724.7615.50277.01217.45234276.2018443.1729.08
5、8.166737.381039.90W27×161700.79356.1116.7627.4315.50305.72239.99261335.8220675.1629.248.227458.361161.17W27×178706.37357.7618.4130.2315.50337.28264.77290811.7823104.6329.368.288233.931291.63722.12358.5221.08411.43322.978.441635.47W27×21738.1015.50369338.4629317.5629.9610229.25W24×55598
6、.68177.9310.0312.8314104.8282.283756255.131210.2623.173.41879.31136.04W24×62603178.8210.9214.9914117.8692.520164813.351435.6623.453.492149.71160.57W24×68602.74227.7110.5414.8614129.76101.86276360.622930.9824.264.752533.77257.43W24×76607.57228.3511.1817.2714144.6113.51187608.553435.5124
7、.614.872883.91300.9W24×84612.14229.1111.9419.5614159.71125.37298772.293929.724.874.963227.11343.04W24×94617.47230.2513.0822.2214178.99140.5112562.914534.0125.085.033645.92393.83W24×103623.06228.613.9724.8914195.57153.522125146.634970.9325.35.044017.15434.9W24×104611.12323.8512.719.05
此文档下载收益归作者所有