文档介绍:County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang a齿左右错开或成波形排列,消除锯背的磨擦力〕。
钳工〔Ⅲ〕 锉削
1. 锉削平面、锉削圆弧面有哪些方法?
答:锉削平面的方法:交叉锉、顺向锉、推锉。锉削圆弧面常采用:滚锉法。
2. 锉刀用何材料制造?举例写出牌号
答:锉刀用碳素工具钢制成,经淬火回火处理,硬度:52~65HRC。牌号:T12A。
3. 锉削外表平整性怎样检查?
答:用量具〔刀口尺、直角尺、钢直尺等〕贴合在工作的外表看是否透光来检查外表平整性。这种方法叫透光法。
4. 图标工件外表(有阴影部分)用哪种锉刀?
答:①平锉 ② 方锉 ③三角锉 ④三角锉、平锉 ⑤半圆锉 ⑥圆锉 ⑦整形锉 ⑧平锉
钳工〔Ⅳ〕 钻孔和螺纹加工
计算鸭嘴锤螺纹底孔直径和锤柄螺纹底径。
答:M10螺纹
d内=D0-P=10-= (mm)
d外=D0-=1×=(mm)
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
2. 在攻丝或套扣的过程中为何要加机油并经常倒转?
答:攻丝加机油起到润滑和冷却的作用,经常倒转使切削刃上切削的切屑断掉,防止破坏加工出的螺纹。
3. 手工攻丝为何分一攻和二攻?
答:手工攻丝分为一攻和二攻,是为了分担切削余量,可使各锥磨损均匀,延长寿命。
4. 比较钻床钻孔与车床钻孔有何不同。
答:钻床钻孔:工件固定不动,钻头旋转〔主运动〕并作轴向移动〔进给运动〕。
车床钻孔:工件旋转〔主运动〕,钻头作轴向移动〔进给运动〕。
5. 比较中心孔钻、麻花钻、扩孔钻和铰刀的结构。
答:中心孔钻:有两级4条主切削刃,前端切削直径小,柄部粗,定心好;
麻花钻:有2条主切削刃,并且有横刃;
扩孔钻:有3-4条主切削刃,前端平的,无横刃,螺旋槽浅,钻芯大,刚性好,导向性好;
铰刀:有6-12条切削刃,切削部分呈锥形,修光部分作导向,校正孔径,修光孔壁。
6. 比较钻孔、扩孔及铰孔的切削用量、加工质量。
答:钻孔:高速,小进给量,品质低,IT12~IT11
扩孔:中速,中等进给量,质量一般,IT10~IT9
铰孔:低速,大进给量,质量精加工,IT8~IT6
7. 标出立式钻床各主要部件名称,并说明其作用。
答:①工作台,作用:摆放夹持固定工件;
②主轴,连接***,传递扭力;
③进给箱,调整进给量;
④主轴变速箱,调整主轴转速;
⑤立柱,支撑、悬挂其它附件;
County continuation records has examined and approved the draft, spirit, believe, comprehensive Yearbook of zhuanglang already prepared draft, entered the phase of evaluation. Civil air defense work
County continuation records has examined and approved the draft, spirit, bel