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单词 mandrel
释义

mandrel

美 ['mændr?l]
英 ['mændr?l]
  • n.【机】轴胎;【冶】(铸造用的)圆形心轴;铁镐
  • 网络芯轴;芯棒;圆棒
复数:mandrels  
n.
1.
【机】轴胎,心轴,紧轴;【冶】(铸造用的)圆形心轴;(采矿用的)鹤嘴锄,铁镐

例句

释义:
1.
The RTTS Safety Joint is held inoperative by a tension sleeve located on the bottom of the mandrel to help prevent premature release.
RTTS的安全接头通过位于芯轴底部的张力套保持原有状态来防止过早解封
wenku.baidu.com
2.
In order to avoid damage to the reinforcement the diameter to which the bar is bent (Mandrel diameter) should not be less than .
为了避免损坏钢筋,钢筋最大弯曲处的直径(芯轴直径)最小应不低于。
gatefanyi.com
3.
Electroformed apertures reproduce the mandrel photo resist finish faithfully and do not require any further processing.
电铸复制卷筒照片孔型图,不需要进一步的加工。
dict.bioon.com
4.
The gear milling positioning fixture is particularly suitable to be matched with the fixture of the mandrel positioning structure.
本发明特别适合芯轴定位结构的夹具配套使用。
ip.com
5.
A floating mandrel, also known as a French type, floats in slots in the dummy block and aligns itself in the die when extruding.
一个浮动的心轴,也被称为法国的类型,在插槽彩车在虚拟块对齐时,模具本身挤出。
wenwen.soso.com
6.
and moving the expander tool with the sleeve located around the mandrel away from the expanded location.
和-移动膨胀工具和位于第一心轴周围的套筒从膨胀位置离开。
ip.com
7.
Take a long pole, the joints should be staggered, with two lengths to the top of the mandrel and then leveling.
立杆接长时,接头应错开,至顶层后再用两种长度的顶杆找平。
blog.sina.com.cn
8.
The result of winding patter experiment shows that UHMWPEF is neither overlap nor gaps and does not slip on mandrel.
线型试验结果表明:UHMWPEF在芯模表面既不重叠又不离缝,位置稳定,不打滑。
www.ceps.com.tw
9.
A fixed mandrel, also known as a German type, means it is integrated into the dummy block and stem.
心轴固定,也被称为德式,意味着它是把假茎块和集成。
wenwen.soso.com
10.
Bend the test piece 180 degrees over a mandrel with its longitudinal axis normal to the axis of mandrel.
将测试件在一根芯轴上弯曲180度,使其纵向轴线垂直于芯轴的轴线。
dictsearch.appspot.com
1.
A hydraulic limiter for the mandrel of a pipe mill relates to the hot rolling pipe mill of seamless steel pipe.
一种轧管机芯棒液压限动装置,涉及无缝钢管热轧管机。
ip.com
2.
An O - ring provides a simple means of retaining the bearing on the mandrel .
O型圈提供在芯棒上保持轴承的简单方法。
www.bing.com
3.
Responsible for building up the staff personal records and electronic records and doing the mandrel work.
负责员工人事档案及电子档案的建档、整理工作;
www.lanhr.com
4.
A port in the gas-lift mandrel provides communication between the lift-gas supply in the tubing annulus and the production-tubing conduit.
气举阀工作筒中的孔口提供了在油管环空中气举气供给与生产油管导管之间的连通。
www.infopetro.com.cn
5.
is the formation of a hardened layer, which transfers the crack initiation site from surface to subsurface of M2 steel mandrel roller.
是形成一个硬化层,其中转让裂纹萌生位置,从地表向地下的M2钢轴辊。
dzh.mop.com
6.
Remaining at the experience control stage, mandrel reaming process in retaining rings lacks the guidance in the formulation of parameters.
护环的芯棒扩孔工艺一直停留在经验控制阶段,对其中工艺参数的制定缺乏指导。
www.fabiao.net
7.
The mandrel must be mounted between centers and a drive plate and lathe dog must be used.
必须将心轴锚定在中心点和驱动板之间的位置,并且必须使用车床轧头。
www.366translation.com
8.
The cold extrusion process without mandrel craft is introduced through the process analysis of the terminal in this paper.
通过对端子的工艺分析,提出无芯冷挤压工艺。
www.chemyq.com
9.
The size of the slit (16) is adjustable to meet the requirements of drawing the mandrel bars with different specifications.
开缝(16)的大小可调以适于拔不同规格芯棒的需要。
ip.com
10.
If not timely maintenance, Mandrel between the blind and the planet carrier sales will be cut, planet carrier will face a serious scratch.
如不及时检修,芯轴与行星架间的盲销就会被剪断,行星架端面将会出现严重划伤。
emuch.net
1.
In this paper, The lubrication characteristics of oil_filled inner spiral fin moving mandrel in spinning process was studied systematically.
系统分析了充液内螺旋翅片游动芯头在旋压过程中的润滑特性。
www.dictall.com
2.
The mandrel is the most important heat-forming tool in MPM and its application effect decides the production cost of pipes.
芯棒是限动芯棒连轧钢管机组中最重要的热变形工具,其使用效果决定着钢管生产成本的高低。
www.chemyq.com
3.
Customers can special order or design to achieve the none-shift speed, add air hold down arm, hydraulic mandrel expansion. . . etc.
可依客户特殊要求特别设计:达到无段变速、加装压料手臂装置、油压扩张装置…等。
china.globalhardwares.com
4.
All of these types of dies incorporate the mandrel in the die and have "legs" that hold the mandrel in place.
这些类型将所有模具在模具和有“腿”的举行地点的心轴芯。
wenwen.soso.com
5.
Analyzing problems regarding non-mandrel drawn tube processing with complex function is a quite new method in this regard.
利用复变函数解析空拔圆管问题是一种新方法。
www.chemyq.com
6.
Thanks to the use of the latest CNC technology, the exact movement and positioning of the tools (mandrel and hammer jaws) even under load.
由于最近CNC技术的使用,即使在负载情况下也精确移动和确定工具位置(心轴和锤头)。
wenku.baidu.com
7.
Outer cladding metal nearby the fusion interface of roll mandrel experienced the process of solidification-fusion-re-solidification.
辊芯熔合界面附近的外层金属先后经历了凝固、熔化、再凝固的过程。
d.wanfangdata.com.cn
8.
The tenderer should provide special dividing plate grinding software and grinding mandrel.
提供专用的分度盘磨削软件及磨削芯轴。
blog.sina.com.cn
9.
The main parameters of open-die cold extrusion without mandrel of thick-wall tube are analyzed.
分析了厚壁管件无芯棒开式冷挤压的主要参数;
www.chemyq.com
10.
A blank gas-lift valve placed in a gas-lift mandrel to isolate the tubing string from the annulus.
装在气举阀工作筒中的封闭式气举阀。它用来隔离油管柱与环形空间。
www.infopetro.com.cn
1.
The tenderer should provide standard gear wheel grinding software and grinding mandrel.
提供专用的标准齿轮磨削软件及磨削芯轴。
blog.sina.com.cn
2.
The influence rule of mandrel roller feeding speed and driven roller angular speed to the rolling speed has been put forward.
得出了芯辊进给速度和驱动辊角速度对于轧制速度的影响规律。
www.ceps.com.tw
3.
Then disassemble the wheel from the mandrel, and then assemble it into the machine tool.
然后从心轴上卸下砂轮装到机床上使用。
www.yook.cn
4.
Paints and varnishes. Bend test (cylindrical mandrel).
色漆和清漆.弯曲试验(圆心轴)
www.mapeng.net
5.
After the consolidation of the composite ring in tension winding, the mandrel is drawn out, and then a hollow ring is formed.
纤维束张紧力缠绕的复合材料厚环固化成型以后,再抽出缠绕芯轴形成空心环,这一过程称为内孔卸载。
www.dictall.com
6.
The invention discloses a movable short mandrel equipment allocated on the output port of mansoni rolling tube mill.
本发明公开了一种在曼氏轧管机出口端配置的可移动短芯棒装置。
ip.com
7.
The variation regularity of residual stress and thickness was discussed based on the experiments of brass tube drawn without mandrel.
在空拉黄铜管工艺实验的基础上,探讨了空拉变形工艺对残余应力和壁厚变化规律的影响。
www.chemyq.com
8.
Mount the workpiece onto a lubricated mandrel of the proper size by using an arbor press.
通过利用杠杆式冲床将工件锚定在适当尺寸的润滑心轴上。
www.366translation.com
9.
The centers must be aligned and the mandrel must be free of burrs.
这些中心点必须排列成一行,并且保证心轴上没有毛刺的现象出现。
www.366translation.com
10.
Paints and varnishes. Bend test (conical mandrel).
色漆和清漆.弯曲试验(锥体心轴)
www.mapeng.net
1.
After the mandrel is melted, a thin layer of alloy remains on the propellant surface.
此心轴溶化之后,在推进剂表面上留有一薄层的合金。
www.jukuu.com
2.
If a solid billet is used as the feed material then it must first be pierced by the mandrel before extruding through the die.
如果一个坚实的钢坯用作那么它必须首先由心轴刺穿,然后经由模具挤出的饲料原料。
wenwen.soso.com
3.
In addition, we completed the intensity calibration of tubing hanger body and lock mandrel.
完成了油管挂本体和锁紧芯轴的强度校核;
www.zidir.com
4.
Failure mode of M2 steel mandrel roller is mainly fatigue fracture.
故障模式的M2钢轴辊,主要是疲劳性骨折。
dzh.mop.com
5.
The Hayne House Industry Co. , Ltd. is specialized in producing all kinds of liquid mosquito mandrel company.
上海恩豪实业有限公司是专业生产各类液体蚊香芯棒的公司。
goabroad.zhishi.sohu.com
6.
The 3-roll mandrel pipe mill is regarded as the most advanced seamless steel tube mill in the world.
三辊连轧管机是当今世界上最先进的轧管机。
lib.cqvip.com
7.
The outer wall of an inner mandrel of each circular tube of the cam is provided with a vertical groove;
该凸轮圆管内芯轴的外壁开有竖向的凹槽,凹槽内嵌挂有钩针;
ip.com
8.
sliding a mandrel head and a tubular rivet body of a rivet assembly through the hole;
将铆钉组件的心轴头和管状铆钉主体滑动通过所述孔;
ip.com
9.
Research on the Pressure Sensitivity of the Interferometric Fiber-Optic Hydrophone with a Concentric Mandrel
同轴干涉型光纤水听器声压灵敏度特性分析
service.ilib.cn
10.
Research on Mandrel Interferometric Polarization Maintaining Fiber Optic Accelerometer
芯轴式干涉型保偏光纤加速度传感器研究
www.ilib.cn
1.
Determination of Spinning Processing Parameters for Journal Reduction of an Integral Non-mandrel Roller
整体式无心轴托辊缩颈旋压工艺参数的确定
www.ilib.cn
2.
Three Dimensional Finite Element Analysis on Stress, Strain and Temperature at Rolled End of Mandrel Steel Round Bar
芯棒钢轧后端部应力应变和温度变化三维有限元分析
www.ilib.cn
3.
Theoretical Inference and Experiential Formulas of Mandrel Diameter Applied to Wind Garter Spring
绕制卡簧用心轴直径的理论推导与经验公式
ilib.cn
4.
The Unitized Machining Technology of the Peeler Mandrel for the Pickling Finishing Line in AnShan Steel
鞍钢酸洗精整线开卷器卷筒组合加工技术
service.ilib.cn
5.
pulling a mandrel to cause the mandrel head to create an upset portion of the rivet body engaging the friction stir welded assembly;
拉动心轴,使得所述心轴头生成铆钉主体的翻转部分,所述翻转部分接合所述摩擦搅拌焊接组件;
ip.com
6.
Study of terminal cold extrusion process without mandrel craft and mold design
端子冷挤压工艺及模具设计研究
www.ilib.cn
7.
Stress and its Effect on Service Life of Mandrel for Cold Ring Rolling
冷辗扩芯辊受力及对其寿命影响分析
service.ilib.cn
8.
inserting a forming mandrel into one end of a tampon blank while the tampon blank is positioned in the press;
当棉塞坯件位于冲压机中时将成形芯棒插入棉塞坯件的一端;
ip.com
9.
Standard Test Method for Flexibility of Resilient Flooring Materials with Cylindrical Mandrel Apparatus
用圆柱形芯轴装置对弹性地板材料韧性的试验方法
www.std168.com
10.
FEM analysis and experiment study of non-mandrel double-pass roll extrusion process of shaped tube
异型管辊挤成型过程的数值模拟与实验研究
www.ilib.cn
1.
The Machining and Assembling of the Uncoiler and Coiler Mandrel of the Galvanizing Line in Panzhihua Iron & Steel Co
攀钢镀锌机组开卷、卷取机中心轴等关键件的加工与部件装配
www.ilib.cn
2.
Discussion on Optimizing Deformation Process to Enhance Mandrel Utilization Factor
优化变形工艺提高芯棒利用效率的探讨
www.ilib.cn
3.
Improvement and Optimization of the Graphite Lubricating System for Mandrel
芯棒石墨润滑系统的改进优化
www.ilib.cn
4.
Development of a Special Mandrel for Installation of Prefabricated Drains
塑料排水板特殊打设头的研制
www.ilib.cn
5.
Numerical Simulation Analysis of Cold-and-Warm Composite Extrusion Technology for Spring Mandrel
地弹簧芯轴冷温复合挤压数值模拟分析
ilib.cn
6.
Study on Inflatable Mandrel Integral Fabrication of Multi-Cavity Composites Structure
多腔室复合材料结构件的气囊整体成型研究
service.ilib.cn
7.
Service-Span Estimate for Silicon Rubber Inflatable Mandrel Employed in Composites Molding
用于复合材料成型的硅橡胶气囊的使用寿命评估
www.ilib.cn
8.
The tampon can be formed by winding an absorbent fibrous web around a winding mandrel;
棉塞的形成过程如下:围绕缠绕芯棒缠绕吸收纤维网;
ip.com
9.
The Application of the Positioning Controller in the Retracted Mandrel System
位置控制器在顶杆回退系统中的应用
ilib.cn
10.
Strain analysis on mandrel and connection bolts for the tension coiler of skin pass mill in cold rolling mill
冷轧平整机组张力卷取机卷筒及连接螺栓应变分析
www.ilib.cn
1.
Technology and Deformation Characteristics of Semi-floating Mandrel Mill
半浮动芯棒连轧管机工艺及变形特点
www.ilib.cn
2.
Test Method for Flexibility Determination of Supported Adhesive Films by Mandrel Bend Test Method
用芯轴弯曲试验法确定承托粘结膜挠曲度的试验方法
www.mapeng.net
3.
Surface quenching with propylene-oxygen flame on the mandrel of the electric shovel
用霞普气-氧火焰对电铲卷筒进行表面淬火
www.ilib.cn
4.
Standard Test Method for Flexibility Determination of Hot-Melt Adhesives by Mandrel Bend Test Method
用马德尔弯曲试验法测定热融胶挠性的试验方法
www.wwlww.com
5.
Application of new Dust-proof Assembly of Cot Mandrel in Combing and Doubling Processes
精梳、并条用新型胶辊芯轴防尘密封结合件的应用
www.ilib.cn
6.
Force analysis of the mandrel of KSQ bidirectional anchor for water injection well
KSQ型水井双向锚中心管受力分析
ilib.cn
7.
Material Selection and Heat Treatment of Mandrel for Precision Steel Tube Cold-rolling Process
冷轧精密钢管用芯棒的选材和热处理
www.ilib.cn
8.
Aerospace; blind rivets with 100 reduced countersunk head, metric series, corrosion-resisting steel, with mandrel
航空和航天.公制系列不锈钢制盲铆钉.带渐缩埋头100℃铆芯
www.mapeng.net
9.
Research on experiment of size prediction of thick-walled tube without mandrel by open-die cold extrusion
厚壁管件无芯棒开式冷挤压尺寸预测的实验研究
www.ilib.cn
10.
Improvement on the Mandrel Mould Material Returning Equipment of Spin-forming Pulley
旋压皮带轮芯模退料装置的改进
www.ilib.cn
1.
Design Principle and Application of the Inter-correct Taper Mandrel
互矫型锥度芯轴的设计原理及应用
www.ilib.cn
2.
Development of creating mandrel software for numerically control Filament winding machine
数控纤维缠绕机芯模造型程序开发
www.ilib.cn
3.
Frictional Tension on Mandrel in Lubrication Extrusion Process
润滑挤压时的穿孔针摩擦拉力
www.ilib.cn
4.
Aerospace; blind rivets with 100 countersunk head, corrosion-resisting steel, with mandrel, metric series
航空和航天.米制系列带铆芯100°沉头不锈钢盲铆钉
www.mapeng.net
5.
Numerical Simulation of Cold and Warm Extrusion Technology for Spring Mandrel
地弹簧芯轴冷温复合挤压成形数值模拟
www.ilib.cn
6.
Research on the optimization of restrained mandrel bar application
限动芯棒使用工艺方案研究
www.ilib.cn
7.
Application of Positioning Controller to Semi-Floating Mandrel Mill Set
位置控制器在半浮芯棒连轧管机组中的应用
www.ilib.cn
8.
Study on Mandrel Forcing During Upsetting When Extruding Tube Using Hollow Ingot
用空心锭挤压管材时在镦粗过程中穿孔针受力研究
www.ilib.cn
9.
Axial constant-pressure roll mandrel fastening structure In high speed wire rod mill
高速线材轧机轧辊轴轴向恒压紧固
ilib.cn
10.
Finite Element Analysis of Die Mandrel Deflection in Hollow Extrusion
空心型材挤压模具模芯变形的有限元分析
www.ilib.cn
1.
Metric Structural Flush Bresk Pull Mandrel Self-Plugging Blind Rivets
米制钢结构抽芯自锁盲铆钉
www.mapeng.net
2.
Research and Development of the Mould Mandrel through Injection Blow Molding
塑料注吹模具芯棒的研究开发
www.ilib.cn
3.
Finite Element Analysis of Influence of Mandrel on Thinning Ratio of Wall in NC Tube Bending
数控弯管中芯棒对管壁厚减薄作用的有限元分析
www.ilib.cn
4.
Discussion on the design method of diameters of series of mandrels of retained mandrel mill
限动芯棒连轧管机芯棒直径系列的设计方法
www.ilib.cn
5.
Automatic Mandrel-stripping System for Large-scale Rocket Motor
大型火箭发动机自动顶芯脱模系统
service.ilib.cn
6.
The spinning technology of the new type non-mandrel roller's cylinder
新型无心轴托辊的旋压工艺
scholar.ilib.cn
7.
Innovation of Inner Water Cooling Piping Connection of Mandrel on Accu-Roll Mill
轧管机芯棒内水冷管连接改进
www.ilib.cn
8.
Mandrel shape judgment on the configuration of the elbow
弯头外观与芯轴形状
www.ilib.cn
9.
Experiment Study on Plastic Forming of Integral Mandrel-less Roller
整体式无心轴托辊塑性成形试验研究
www.ilib.cn
10.
a screw is mounted on the screw mandrel and fixedly connected with the moving seat;
丝母安装于丝杆上,并与移动座固定连接;
ip.com
1.
Nitriding and vacuum heat treatment teat for spinning mandrel
旋压芯棒的氮化和真空热处理试验
service.ilib.cn
2.
Cylinder Pushing Force Determination for Pay-off Reel Mandrel
开卷机卷筒涨缩缸推力的确定
www.ilib.cn
3.
Design of a New Expanding Mandrel for Test
新型检测用变径胀轴的设计
ilib.cn
4.
pan head break mandrel blind rivets , in stainless steel material
不锈钢平圆头抽芯铆钉
www.ichacha.net
5.
Specifications for break mandrel blind rivets
抽芯铆钉技术条件
www.bing.com
6.
Finite element analysis for segment of lever-plunger mandrel
基于有限元分析的卷筒扇形板结构优化设计
www.ilib.cn
7.
Analysis on the Deformation of No-mandrel Bending of Minor Diameter Tube
小直径管无芯弯曲变形分析
ilib.cn
8.
pan head break mandrel blind rivets , in aluminum alloy material
铝合金平圆头抽芯铆钉
www.ichacha.net
9.
Measurement of and Study on Rolling Forces of Full-floating Mandrel Mill
全浮动芯棒连轧管机组轧制力测试与研究
www.ilib.cn
10.
Test Methods for Mandrel Bend Test of Attached Organic Coatings
用锥形心轴仪测定涂覆有机涂层延伸率的试验方法
www.mapeng.net
1.
Machining and Modification Method of Big Taper Surface vs. The Mandrel
大圆锥面加工调整方法与心轴
ilib.cn
2.
A New Technology of Electroforming on Aluminium Mandrel
铝芯模电铸新工艺
service.ilib.cn
3.
Paracentesis trocar with plain mandrel
平穿刺套管针
www.7kang.com
4.
Analysis and improvement on surface quality of CC round billet for pipe-rolling with mandrel millLI
连铸连轧圆管坯表面质量分析与改进
www.ilib.cn
5.
Bend test for coating (cylindrical mandrel)
漆膜弯曲试验(圆柱轴)
www.zftrans.com
6.
The study on the law of plastic-deformation of tube bending without mandrel
管无芯弯曲中塑性变形规律的研究
www.ilib.cn
7.
Computer Simulation of Melt Flow in Pipe Die with Spiral Mandrel
螺旋式管材机头内熔体流动的计算机模拟
service.ilib.cn
8.
Rotary shaft lip type seals for automobils; test; skittle measuring mandrel
汽车用唇型旋转轴密封环.检验.锥度测量心棒
www.mapeng.net
9.
Mushroom head break mandrel closed end blind rivets
封闭型沉头抽芯铆钉
wenku.baidu.com
10.
Technical Development of Full-floating Mandrel Mill Process of Baosteel Tube Plant
宝钢钢管全浮动芯棒连轧工艺的技术进步
www.ilib.cn
1.
test methods for bare wires - mandrel winding test
裸电线试验方法卷绕试验
www.ichacha.net
2.
according to steel tubes with different calibers, a rotating screw mandrel drives the moving seat to move oppositely;
针对不同管径的钢管,转动丝杆带动移动座作相相向运动;
ip.com
3.
The Spinning Forming of Integral Non-mandrel Roller's Tube
整体旋压式无心轴托辊管体的旋压成形
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4.
Static fe analysis of spinning of cone without mandrel
锥形件无芯模旋压的静态有限元分析
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5.
The Effect of Sulphide on Fatigue Crack Initiation of Cold Ring-Rolling Mandrel
硫化物对冷辗芯辊疲劳裂纹萌生的影响
scholar.ilib.cn
6.
Mushroom head break mandrel blind rivets
开口型扁圆头抽芯铆钉
blog.globalimporter.net
7.
Testing of leather; mandrel-bending test
皮革的检验.硬芯弯曲试验
www.mapeng.net
8.
Hot mandrel test apparatus Hot wire ignition test
热丝引燃测试
www.testingchina.com.cn
9.
Metric Break Mandrel Closed End Blind Rivets
公制闭端盲孔抽芯铆钉
www.mapeng.net
10.
Bend test for coating (conical mandrel)
漆膜弯曲试验(锥形轴)
www.zftrans.com
1.
the ring body (1) is sleeved on a mandrel and is fixed on a changeover panel (7);
环体(1)套在芯模上,并固定在转接盘(7)上;
ip.com
2.
No Mandrel Movement During Setting
坐封时轴不移动
wenku.baidu.com
3.
Effect of Feed Velocity of Mandrel on Cold Ring Roll Process
芯辊进给速度对环件冷轧工艺的影响规律
service.ilib.cn
4.
Metric Break Mandrel Blind Rivets
公制盲孔抽芯铆钉
www.mapeng.net
5.
PULL THROUGH MANDREL BLIND RIVETS
带心轴盲孔铆钉
www.mapeng.net
6.
DC Drive System of Retainer of Semi-floating Mandrel Mill
半浮连轧管机组限动链传动控制系统
ilib.cn
7.
a nut (6) and a gasket (7) are arranged on a step mandrel (12), and a locking collar (8) is clamped in the positioning core (11);
螺母(6)和垫片(7)安装在阶梯芯轴(12)上,锁圈(8)卡装在定位芯(11)内;
ip.com
8.
How to Use Hydraulic Cylinders in Mandrel Drawing Mechanism of Mould
在塑料模中应用液压抽芯机构
service.ilib.cn
9.
The Design of Small Taper Mandrel
小锥度心轴的设计
service.ilib.cn
10.
Internal Stress and structure of Hoist Mandrel
提升机卷筒的内部应力及结构
www.ilib.cn
1.
How to Improve the Properties of the Coiler Mandrel
改善铝材卷取机卷筒性能的途径
service.ilib.cn
2.
Minimum mandrel diameter for bends, hooks and loops (see Figure 8. 1)
弯曲处的最小心轴直径,鱼钩和圆环形(见图8.
gatefanyi.com
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