Shanghai Daoqin Plastics Co., Ltd.

        1: what 叫图样?

        答: can 够准确 table/sheet material 体 形状 large small and technology requirements as 图.

        2: what 叫投影图?

        答: is 一组射线 through material toward 预定平面 upper to methods.

        3: method classification has types?

        答: can separation is in 心投影 method and 平行投影 method, 平行投影 method also separation is positive and 斜投影.

        4: what 叫剖视图?

        答: 一组平行 light through material in 投影面 upper to 图形

        

        5: material 体投影 三 basic is what?

        答: is 主视图, 俯视图, left 视图.

        6: 三视图 投影规律 is what?

        答: 主, 俯视图 long for positive;主, left high 平齐;俯, left wide versus and other.

        7: metal physical properties which inner 容?

        答: density, melting point, hot property, conductive property and thermally conductive property.

        8: what melting point?

        答: is metal solid 态转变 formed liquid temperature degree.

        9: what metal chemical property can?

        答: is metal material in room temperature or high temperature lower resistant its chemical for it can force.

        10: chemical property can which?

        答: resistant oxidation property and corrosion resistant property.

        11: what resistant oxidation property?

        答: in room temperature or high temperature lower resistant oxidation can force.

        12: what corrosion resistant property?

        答: in high temperature lower resistant water gas and other material 质腐蚀 can force.

        13: what mechanical properties?

        答: metal material resistant outer force function can force.

        14: mechanical properties which?

        答: strong/high degree, hardness, property, tough property, fatigue strong/high degree and other.

        15: what deformation?

        答: metal material in outer force function lower and dimensions 发生 变化.

        16: metal material deformation can separation is types?

        答: can separation is tensile, pressure shrink, bending, and 剪切.

        17: what elastic property 极限?

        答: material in elastic property stage/phase can most large force.

        18: what 叫屈服 strong/high degree?

        答: material in 出现屈服 phenomenon can most large force.

        19: what resistant strong/high degree?

        答: material in front can most large force.

        20: what property?

        答: material easy generate deformation 而不致 fracture property 质.

        21: what material hardness?

        答: material resistant its it material pressure its surface can force.

        22: hardness table/sheet methods has types?

        答: has hardness, hardness, hardness.

        23: what metal material process property can?

        答: metal material property can is easy processing molding.

        24: metal process property can which?

        答: 包括铸造 property, welding property, pressure property, property and hot property.

        25: what alloy 钢?

        答: in carbon 钢 基础 upper is improvement certain mechanical properties has add alloy 元素 钢.

        26: alloy can separation is type?

        答: can separation is alloy structure 钢, alloy tool 钢, applications 钢.

        27: what iron?

        答: carbon amount large 于2.11% iron carbon alloy iron.

        28: iron can separation is type?

        答: 白口铸 iron, 灰口铸 iron, 球墨铸 iron, alloy iron, can iron

        29: iron easy identification method has which?

        答: identification method, identification method, coating color identification method.

        30: alloy structure has which?

        答: solid solvent 体, metal combined material, machine mixed combined material.

        31: what 叫临界点?

        答: metal structure 改变时 temperature degree.

        32: what 叫淬火?

        答: will add hot to temperature degree above temperature degree, temperature rear fast speed cooling obtain 马氏体组织.

        

        33: what 叫退火?

        答; will add hot to temperature degree, temperature time rear slow cooling to room temperature.

        34: what 叫淬透 property?

        答: in conditions lower rear obtain temperature degree 淬透层 can force.

        35: what 叫回火?

        答: will add hot to Ac1 below/following certain temperature degree temperature time 待组织转变完 formed rear cooling to room temperature types methods.

        36: what 叫调质?

        答: is and high temperature versus combined hot methods.

        37: carbon is what?

        答: is make active property carbon 原子渗入钢 surface improve/increase surface carbon amount.

        38: what hot hard property?

        答: is in high temperature lower maintain hardness can force.

        39: aluminum alloy separation type?

        答: can separation is aluminum alloy and aluminum alloy.

        40: copper alloy separation type?

        答: can separation is copper, copper, copper.

        41: identification method in types is what?

        答: 直尾花, 枪尖尾花, 狐尾花.

        42: strip/profile function has which?

        答: has conductive and toward provide filling metal function.

        43: upper function force has which?

        答: has heavy force, surface force, electrical magnetic pressure shrink force, pressure, and other 离子流 force, electrical gas force.

        44: gas iron easy generate defect has which?

        答: main/primary has 白点, cracks, gas difficult oxidation material and other.

        45: what welding property?

        答: metal material for welding processing property, main/primary in welding process conditions lower obtain excellent welding difficult easy degree.

        46: welding process in generate force and deformation main/primary causes is what?

        答: is non-uniform add hot and cooling.

        47: what one-time crystallization?

        答: welding metal liquid 态转变 is solid process.

        48: Common property can has type?

        答: has 不锈钢, heat resistant 钢, corrosion resistant 钢.

        49: titanium alloy separation type?

        答: separation a type, b type, a+b type.

        50: generally has types 形式?

        答: main/primary has 搭接, 角接, for 接.

        51: hot 铆 操 as process has which?

        答: has by parts solid and 修整钉孔, add hot, and 穿钉, 顶钉, 铆接.

        52: what 叫螺纹联接?

        答:;就 is utilizing parts formed can solid 定联接.

        53: commonly used 螺纹联接 has types 形式?

        答: has 螺栓联接, di 头螺栓联接, and 螺钉联接.

        54: gasket has types? its function is what?

        答: can separation is generally use gasket, anti 止松动 and applications gasket types. function is increase large 支撑面, cover/cap relatively large 孔眼, anti loss parts surface and 垫平.

        55: anti 止松动 gasket has which?

        答: has elastic gasket, 圆螺母止退 gasket, mono 耳止动 gasket, di 耳止动 gasket.

        56: 切线面 important is what?

        答: is 同一素线 upper has same 切平面.

        57: what can surface?

        答: surface can full 部平整 摊平 in 一 平面 upper, 而不发生撕裂 or 皱折, this type of surface can surface.

        58: 何谓不 can surface?

        答: 若立体 surface can 自然平整 摊平 in 一 平面 upper can surface.

        59: methods has which features?

        答: is 先按立体 surface property parts surface separation formed many small 平面, use this small 平面 逼近立体 surface.

        60: 平行线展开 method principle is what?

        答: is will surface as 由无数 strip/profile versus 互平行 素线组 formed versus 连两素线 and its 端线 围 formed micro small as is 平面, need will small true large small 依次顺序, in upper to 展开图.

        61: 放射线展开 principle is what?

        答: is will surface use 放射线 separation formed 共顶 若 dry 三角形, its large small rear still use 发射线形式依次 will it in 同一平面 upper 就 求锥体 surface 展开图.

        62: 三角形展开 steps is what?

        答: 画出构 parts necessary 视图, use 三角形 separation material surface, 求出三角形各边 实 long 依三角形次序画展图.

        63: what in property 层?

        答: sheet/plate material bending outer material tensile long, inner material pressure shrink short in long and shrink short between in long degree maintain fiber in property 层.

        64: is what need sheet/plate thick 处理?

        答: sheet/plate thick large 于1.5mm parts dimensions requirements 精确时, must need sheet/plate thick 处理. 否则会 generate parts dimensions quality 差甚至造 formed waste product.

        65: sheet/plate thick 处理 原则 is 什麽?

        答: long degree parts in property dimensions is 准, through 计算 出;展开图 in high degree is parts 接触处 high degree is 准.

        66: sheet/plate thick main/primary inner is what?

        答: bending parts in property and remove sheet/plate thick dry 涉.

        67: what lower material? methods has which?

        答: lower material is will parts or from raw materials upper separation lower 工序, methods has: 剪切, gas 割.

        68: processing has features?

        答: production rate high, light 洁, can sheet/plate and various type 材.

        69: 剪切 实质 is what?

        答: is through upper lower for material add force, make material 发生剪切 deformation most rear fracture separation 离.

        70: improve/increase 剪断面 quality main/primary measures is what?

        答: increase strong/high degree combined 理 剪刃间隙以 and will material pressure in lower 剪刃.

        71: front for has effect/influence?

        答: front large small not only effect/influence force and quality, but also effect/influence strong/high degree.

        72: rear has and function?

        答: function is decrease/reduce material and 剪刃 摩 scratch usually rear is 1.5～3

        73: for material property can has effect/influence?

        答: can 引起材 material deformation and material generate cold processing hard 化.

        74: gas has which features?

        答: equipment simple cost low, production efficiency high, can achieve various 位置 切割.

        75: oxygen －乙炔切割 process several stage/phase formed?

        答: metal preheating, 燃烧, oxidation material by remove stage/phase formed.

        76: metal gas must tool which conditions?

        答: (1) metal 燃点必 must low its melting point. (2)燃烧生 formed oxidation material melting point low metal melting point (3) metal need 释放出 a large amount of hot metal thermally conductive property need low.

        77: iron is what can gas 割?

        答: its high melting point, formed high melting point SiO2, oxidation material viscosity large, flow property 差, high speed gas easy it remove.

        78: use oxygen gas bottle attention/notes 什麽?

        答;放置时必 must 平稳, can 靠;距 its it 火源5m以 outer; prohibited 撞击;夏天 anti 晒;冬天严禁火烤, application hot hydrolysis 冻.

        79: 回火保险 device function is what?

        答: 截住回火 gas 流, ensure 乙炔发生 device safety.

        80: decrease pressure device has function?

        答: decrease pressure, pressure.

        81: gas front 装备工 as has which?

        答: has 场 准备, 检查切割 oxygen 流线(即风线)

        82: what preheating can rate?

        答: is can gas small consumption amount table/sheet mono 位.

        83: preheating can separation is types?

        答: in property 焰, carbon 化焰, oxidation 焰.

        84: what 叫回火?

        答: 切割时因嘴头 hot or oxidation iron 渣 飞溅 make 嘴头堵住 or supply and 时嘴头 generate 爆鸣发生回火.

        85: 发生回火应采取 what methods?

        答: speed preheating oxygen gas and oxygen gas 阀门, retardant oxygen gas 倒流入乙炔 tube/pipe inner make 回火熄灭.

        86: what and other 离子弧切割?

        答: high temperature, high speed and other 离子弧 as hot 源, will by metal or non metal local 熔化, meanwhile use high speed gas will 以熔化 metal or non metal 吹走而形 formed narrow process process.

        87: and other 离子弧切割 has advantages?

        答: can 切割不锈钢, aluminum, iron, and its it difficult metal or non metal;切割 speed degree fast, deformation small; cost relatively low.

        88: parts processing which inner 容?

        答: 包括铆接, welding and is assembly as 准备而 in parts upper 进行 钻孔, filament, sleeve/set filament, 挫削, 凿削, 刨边, 开坡口 and other.

        89: what 叫钻孔?

        答: use in 实心材 material upper processing 出孔.

        90: has types?

        答: has 麻花钻, 扁钻, in and other.

        91: 钻头 柄部 has function?

        答: and 传递钻孔时 需 扭矩 and toward force.

        92: 锥柄钻头 in has function?

        答: use increase 传递 扭矩, 避免钻头 in 主轴孔 or sleeve/set in 打出.

        93: in toward separation function?

        答: it in process in can maintain positive 直 钻削 direction. meanwhile tool has light function and also is 切削部 separation rear separation.

        94: in will 钻穿时会出现 which defect phenomenon?

        答: 当钻头 rigid 钻穿工 parts toward retardant force decrease small, due to 钻床进 to machine 械 间隙 and elastic property deformation 突然恢复, will make 钻头以 very large to amount 自动切入, 以致造 formed 钻头折断 or quality reduce.

        95: 钻孔时切削 liquid has function?

        答: decrease/reduce scratch, reduce retardant force and temperature degree, improve/increase 钻头 切削 can force and surface quality.

        96: what 叫切削 use amount?

        答: is speed degree to amount and deep degree 总称.

        97: what abrasion 削?

        答: is use for parts surface processing methods.

        98: what 叫展开?

        答: will metal structure surface or local it 实际形状 large small 依次摊开 in 一 平面 upper process 叫展开.

        99: 划展开图 methods has types?

        答: has 平行线 method, 三角形 method, 放射线 method.

        100: 平行线 method conditions is what?

        答: is parts surface versus 互平行,且 in 投影面 upper 反映实 long.

        101: sheet/plate thick 处理包括 which inner 容?

        答: bending parts in property and remove sheet/plate thick dry 涉.

        102: sheet/plate thick in property 层位置 改变 and which factors has 关?

        答: and sheet/plate bending semi and sheet/plate material thick degree has 关.

        103: versus parts sheet/plate thick generally is what?

        答: long degree parts in property dimensions is 准, 展开图 in high degree parts 接触处 high degree is 准.

        104: main/primary inner is what?

        答: sheet/plate thick 处理, as and according to already 做出 构 parts 展开图 made as material sheet/plate.

        105铆工 commonly used equipment has which?

        答: has 龙门剪 sheet/plate machine, 斜口剪 sheet/plate machine, 圆盘剪 sheet/plate machine, type sheet/plate machine combined machine.

        106: sheet/plate machine 按轴辊数目 and 布置形式 can separation is types?

        答: separation is for 称式三辊, for 称式三辊, 四辊三 types.

        107: 冲裁模按 structure can separation is which?

        答: separation is simple 模, belt/tape 导柱模, clamping.

        108: composite/compounding 冲裁模 structure features is what?

         tool has 一 既起落 material function, also 起冲孔凹模 function 凸凹模.

        109: what 叫冲裁 force?

        答: in 冲裁时材 material for mold most large resistant force.

        110: 冲裁时 sheet/plate material separation deformation process can separation is which stage/phase?

        答: separation is elastic property deformation stage/phase, property deformation stage/phase and stage/phase.

        111: what most small bending semi 径?

        答: in material 不发生破 bad lower can bending semi most small value.

        112: decrease/reduce pressure parts elastic commonly used methods has which?

        答: has positive mold method and add pressure positive method.

        113: tensile using/adopting pressure 边圈 目 is what?

        答: main/primary is is anti tensile parts 边缘起皱.

        114: pressure machine 曲柄连杆 machine has function?

        答: it can make 旋转运动变 formed 往复直线运动, meanwhile also can force large function.

        115: sheet/plate 金工手工 molding which inner 容?

        答: bending, 拱曲, 拔缘, 卷边, and positive.

        116: 展形样 sheet/plate has which function?

        答: can used for material, manufacturing separation mold and manufacturing 铣切样 sheet/plate.

        117: what 叫放边? formed methods has which?

        答: in molding process in make deformation 部位 边缘材 material 伸展变 thin as 叫放边. formed methods has thin and thin.

        118: what 叫拔缘?

        答: utilizing and methods, will sheet/plate material processing formed bending parts.

        119: what 叫卷边?

        答: is increase processing parts rigid property and strong/high degree will parts 边缘卷曲叫卷边.

        120: what 叫咬缝?

        答: block sheet/plate material or block sheet/plate material 两边折转咬 combined 并彼此 pressure 紧, is 咬缝.

        121: what sheet/plate thick 处理?

        答: is remove sheet/plate thick for 展开图 形状 and large small effect/influence, 而采取 methods.

        122: bending parts long degree generally steps has which?

        答: will bending parts separation formed and 圆弧段; separation 别计算各段 long degree; will long degree versus add.

        123: in what lower application type 钢 切口 lower material?

        答: 角钢, 槽钢, 工字钢弯 formed 折角.

        124: 整 冲裁 process separation several stage/phase?

        答: separation stage/phase. elastic property deformation stage/phase;塑 property deformation stage/phase;剪裂 stage/phase.

        125: what is 冲裁?

        答: utilizing sheet/plate will sheet/plate material separation and 另一部 separation 沿一定 封闭线 strip/profile versus separation 离 冲 pressure 工序.

        126: 螺栓联接 has types?

        答: has types: 承受轴 toward tensile function 联接;承受横 toward function 联接.

        

        127: 螺栓联接 anti measures has which?

        答: increase large scratch force; machine anti 松.

        128: machine anti has which methods?

        答: 开口销;止退 gasket;止动 gasket;串联钢 filament.

        129: what welding electrical 弧?

        答: in electrical gas 体介质 in generate strong/high 烈而持久 放 electrical phenomenon.

        130: welding electrical 弧由哪几部 separation formed?

        答: anionic 极区; cationic and 弧柱组 formed.

        131: strip/profile has direction 运动?

        答: toward direction 移动;沿 welding direction 移动; as toward 摆动.

        132: 焊缝按空间位置 can separation is types?

        答: separation is 平焊, 立焊, 横焊, 仰焊.

        133: versus has features?

        答: is 两形体 surface has is separation 界线; in 空间总 is 封闭.

        134: what versus 贯线?

        答: or above 几何体 versus formed parts.

        135: effect/influence quality factors is what?

        答: mold 间隙;凸凹模 in 心线不 heavy combined; mold as abrasion loss 变钝.

        136: mold design generally is what?

        答: in ensure pressure quality front lower force design mold, easy manufacturing, process 简便

         cost low, use 方便.

        137: calendering force 目?

        答: is is positive selection calendering equipment.

        138: what 叫自由 bending?

        答: bending 终 时凸模, 毛坯, versus combined rear again impact function.

        139: what positive bending?

        答: 指凸模, 毛坯, 凹模, 三者吻 combined rear also has one-time impact, for bending parts positive function.

        140: pressure made 封头时 easy generate what defect?

        答: and 起包;直边拉痕 pressure 坑; outer surface micro cracks;纵 toward 撕裂;偏斜;椭圆;直径 large small 不一致.

        141: what 叫胀接?

        答: utilizing tube/pipe and tube/pipe sheet/plate deformation to and solid methods.

        142: 计算冲裁 force is what?

        答: is combined selection equipment can force and design mold.

        143: use what methods can reduce force?

        答: 斜刃冲模;阶梯冲模; add hot 冲模.

        144: bending force is what?

        答: is selection bending pressure machine and design mold.

        145: deformation degree which inner 容?

        答: 包括: 贴模程 degree;材 material 拉形允许 deformation degree.

        146: how to 确定工 parts 拉形次数?

        答: based on by parts most large deformation amount and material elongation.

        

        147: 拉形系数 how to 确定?

        答: 取决于材 material property can, 拉形包角, friction coefficient and is made 拉形.

        148: which material 不适宜进行 cold as positive?

        答: high carbon 钢, high alloy 钢, iron and other property material.

        149: 当角钢出现 complex deformation its positive is what?

        答: positive 扭曲, again positive bending most rear positive deformation.

        150: 引起钢 structure deformation causes has which?

        答: types is outer force 引起, types is internal stress 引起.

        151: remove welding residual stress methods has which?

        答: overall high temperature 回火; local high temperature 回火; temperature tensile method; machine tensile method;震动 method.

        152: what is welding overall deformation?

        答: structure 发生 形状 and dimensions 变化.

        153: what 叫锤展 method?

        答: through make metal sheet/plate fiber 组织伸 long.

        154: 铆钉杆 long degree how to 确定?

        答: according to by parts thick degree, and 钉杆直径间隙, process and other factors 确定.

        155: rear 铆钉头 small causes is what?

        答: is relatively short or 孔径太 large.

        156: welding metal 处状态 different, can separation is types?

        答: separation is types, 熔焊, pressure 焊, 钎焊.

        157: what 叫熔化焊?

        答: utilizing local add hot make welding 接头达 to 熔化状态 methods.

        158: what 叫夹紧?

        答: is outer force, make rear parts solid 定, make its in processing process in maintain 位置不变.

        159: what 叫六点定位规则?

        答: use 六 定位点 限 made parts in 空间 自由, 以求 完 full parts 空间位置.

        160: what versus for degree?

        答: parts upper by 测 线 or versus for/regarding amount 基准线 or 面 平行 degree.

        161: what versus for degree?

        答: parts upper by 测 线 or 面, versus for/regarding amount 基准线 or 面 垂直程 degree.

        162: assembly in use tool has types?

        答: assembly tool; assembly tool; assembly tool.

        163: commonly used assembly tool has which?

        答: has filament 绳, iron 链, 手拉葫芦 and specialized tool.

        164: 冲裁模 has types toward 形式?

        答: has 导柱, sleeve/set and sheet/plate types 形式.

        165: 冲裁模 has separation formed?

        答: as separation, material 定位部 separation, material separation and base/seat formed.

        166: tensile 模间隙 has function?

        答: decrease small material and between scratch control material in 凹模行腔 inner flow.

        167: 咬缝按 its structure can separation is types?

        答: can separation is mono 咬缝;立式 di 咬缝;卧式平咬缝 and various 角咬缝.

        168: outer force rear, bending parts generate elastic causes is what?

        答: is is bending 时, sheet/plate material outer surface inner surface pressure, therefore generate elastic.

        169: how to to cold and hot 拱曲?

        答: cold is through shrinkage sheet/plate material 边缘放展 sheet/plate material in to, hot is through add hot make sheet/plate material shrinkage to.

        170: methods has types?

        答; has types, types is use general purpose tool 拔缘, types is use type 胎拔缘.

        171: what 叫收边?

        答: is make sheet/plate material 起皱, again 起皱处 in anti 止伸展恢复 情况 lower pressure 平, this 样, sheet/plate material by shrinkage long degree decrease small, make thick degree increase large.

        172; basic principle is what?

        答: principle is for/regarding 凸曲线弯边工 parts formed main/primary is bending 平面边 outer material shrinkage increase thick short, make 立边呈曲线形状.

        

        173: positive is what?

        答: is through add outer force or local add hot, make relatively long fiber shrink short, relatively short fiber long, most make fiber 趋于一致达 to positive 目.

        174: 火焰矫 positive principle is what?

        答: is utilizing metal local add hot rear generate deformation 抵消原 has deformation, to positive 目.

        175: effect/influence 火焰矫 positive factors has which?

        答: has parts rigid property; add hot 位置;火焰 hot amount; add hot and cooling methods.

        176: 火焰矫 positive add hot methods which?

        答: has 点状, and 三角形 add hot.

        177: process amount factors has which?

        答: has 放样误差 effect/influence; parts processing process in effect/influence; assembly effect/influence; welding deformation effect/influence;火焰矫 positive effect/influence.

        178: sheet/plate its applications can separation is type?

        答: can separation is material sheet/plate, molding sheet/plate, 定位样 sheet/plate and 样杆.

        179: methods has which?

        答: has types, 直接画样 method and 渡画样 method.

        180: 放样基准线 generally how to 选?

        答: strip/profile versus 互垂直 线 or 面;以两 strip/profile in is 基准线;以一 平面 and strip/profile in is 基准.

        181: what 叫放样允许误差?

        答: again process in, due to to amount tool and tool degree and as water and other factors effect/influence, 实样图会出现一定 dimensions 偏差, this type of control in scope/range inner, 就叫放样允许误差.

        182: structure 放样包括 which inner 容?

        答: 确定各部结 combined and 连接形式; according to production processing can force to necessary 改动;计算 or amount parts material long and parts 实际形状; design tool or 胎架.

        183: 求直线段实 long methods has types?

        答: method;直角三角形 method;换面 method;支线 method.

        184: 直角三角形 method 求线段实 long as 图规律 is what?

        答: is use in 任意投影面 upper as is 直角三角形 一 直角边, use for 应投影 for/regarding 该面垂直 轴 upper long degree as is 另一直角边, its 斜边即 is 线段实 long.

        185: what 叫旋转 method long?

        答: is generally 位置 绕一 solid 定轴旋转 formed 平行线, 则该线 in and 之平行 投影面 upper 投影反映实 long.

        186: 求曲线实 long methods has which?

        答: has method;展开 method.

        187: what 叫换面 method?

        答: is 另设一 new 投影面 and 曲线平行, 则曲线 in upper 投影反映实 long.

        188: 何谓展开 method?

        答: is will 曲线视图 in long degree 伸直, maintain 另一视图 in high degree as 出 展开线即 is 求.

        189: 截交线 basic is what?

        答: 截交线一定 is 由封闭 直线 or 曲线 围 formed 平面图形;截交线 is 截平面 and surface has 线, is that in 截平面 upper, also in surface upper combined formed.

        

        190: 求立体截交线 methods has which?

        答: method;棱线 method.

        191: as 曲面立体截交线 methods has which?

        答: method and method.

        192: versus has 何特征?

        答: is versus 交两形体 surface has 线, is versus 交两形体 separation 界线;二 is versus 贯线都 is 封闭.

        193: versus 贯线 实质 is what?

        答: is in 两形体 surface upper 找出一定数 amount has 点, will this has 点依次连接起 即 is 求.

        194: versus methods selection is what?

        答: use method versus 贯线至 less already versus 贯线 一 投影; use 辅助平面 method versus 贯线, 截交线应 is most simple 几何图形;球面 method suitable for 回转体 versus 贯, 且轴线 versus 交 构 parts.

        195: again what conditions lower, versus is 平面曲线? positive 面投影 is versus 交两直线?

        答: outer 切于同一球面 任意回转体 versus 贯时, its versus is 平面曲线, 此时, 当两回转体 轴线都平行于 its basic 投影面则 versus in upper is versus 交两直线,

        196: what 叫直纹 surface?

        答: is 以直线 is 母线而形 formed surface.

        197: has features?

        答: has has versus 互平行; use versus 互平行 平面截切柱面时, its 断面图形 same.

        198: has features?

        答: has has versus 交于一点; use versus 互平行 平面截切锥面时, its 断面图形 versus 似; 锥顶 截交线 is 三角形.

        199: 拉形时, material property deformation process separation several stage/phase?

        答: material bending;材 material by tensile deformation;补拉.

        200: what 叫拉形?

        答: is sheet/plate material in 受拉状态 lower, make 之按理想曲面而 generate property deformation, 并克服回 elastic molding methods.