moocFundamentals of Machine Manufacturing Technology答案(慕课2023课后作业答案)
49 min readmoocFundamentals of Machine Manufacturing Technology答案(慕课2023课后作业答案)
Basic knowledge in the metal cutting process(1)
1、答案答案When n=120r/min,慕课vf=480mm/min, the teeth of the face milling cutter z=20, the feed per tooth of the milling cutter is
A、0.35mm
B、课后0.3mm
C、作业0.2mm
D、答案答案0.4mm
2、慕课The课后 dimension of the cutting layer measured along the machined surface is called （ ）
A、cutting depth
B、作业cutting length
C、答案答案cutting width
D、慕课cutting thickness
3、课后when the workpiece diameter decreases or the feed quantity increases,作业 the working clearance angle of the turning tool （ ）
A、decreases
B、答案答案increases
C、慕课unchanged
D、课后uncertain
4、The tool tip of the external turning tool is installed higher than the workpiece rotation axis, the working rake Angle of turning tool is （ ）than that of marked rake angle
A、lager
B、smaller
C、equal to
D、unidentified
5、When the tip of turning tool is at the highest position of the main cutting edge, The inclination angle of the edge is ( )
A、-
B、+
C、0
D、uncertain
6、( ) reflects the work load on the cutting edge per unit length
A、cutting depth
B、cutting layer
C、cutting length
D、cutting width
7、There is one and only one ( ) on the various machine tools.
A、main motion
B、feed motion
C、cutting motion
D、tool motion
8、In machining, the surface being machined by the main cutting edge is ( )
A、surface of the blank
B、machining surface
C、machined surface
D、surface to be cut
9、When drilling, the back engagement is equal to ( ).
A、the drill diameter
B、half of the drill radius
C、hole depth
D、the drill radius
10、The sum of rake Angle, clearance angle and wedge Angle is ( ). The sum of the major cutting edge angle, minor cutting edge angle, and tool included angle. is ( )
A、90 ° , 180 °
B、90 ° , 90 °
C、180 ° , 180 °
D、180 ° , 90 °
11、The orthogonal plane reference system is composed of three coordinate planes: the reference plane, and the orthogonal plane.
A、normal section
B、longitudinal section
C、the cutting edge plane
D、transverse section
12、When installing the turning tool, If the center line of the tool bar is not perpendicular to the feed direction, it will cause the change of the tool major cutting edge angle and the minor cutting edge angle.
13、Due to the influence of cutting movement, the position of the base plane and the cutting plane changed, resulting in a change in the working Angle.
14、Due to the influence of cutting movement, the position of the base plane and the cutting plane changed, resulting in a change in the working angle.
15、The inclination angle of the tool cutting edge is measured in the reference plane.
16、Cutting parameters include cutting speed, feed and cutting thickness.
17、When turning, the parameters of the cutting layer are measured in the reference plane.
18、The height of turning tool installation has the same effect on the rake and clearance angles, when machining the outer circle and the inner hole.
19、The three planes of the normal plane reference system are perpendicular to each other
20、when drilling, the cutting speeds are the same at all points on the main cutting edge of the drill.
21、The tool angles measured in the reference plane are major cutting edge angle, minor cutting edge angle, and tool included angle
22、when drilling, the drill rotates and moves axially. Thus, The main motion is the motion of the drill.
Basic knowledge in the metal cutting process(1)
1、Write out the main motion of each cutting method in the table below Cutting method main motion 1 turning, Rotational motion of the workpiece 2 milling 3 drilling 4 boring 5 Planning (on shaper)
2、What kinds of tool static reference system are there? Which reference planes do they consist of?
Unit 2 ：Basic knowledge in the metal cutting process（2） and Basic rules in the metal cutting process and their applications（1）
Basic knowledge in the metal cutting process（2）
1、Processing plastic metallic materials , Cutting tool materials are often used ( ) cemented carbide.
A、YT
B、YG
C、金刚石
D、T8
2、In cutting, the length of the chip is usually ( ) the length of the cutting layer.
A、longer than
B、shorter than
C、equal to
D、uncertain
3、The cutting force of 45 steel after normalizing is ( ) that of 45 steel after quenching and tempering.
A、smaller than
B、larger than
C、equal to
D、uncertain
4、when κr increases ， cutting force will FP（ ）in the outer circle turning
A、increase
B、unchanged
C、decrease
D、slightly changed
5、The allowable cutting speed of the tool material depends on its ( ).
A、Wear resistance
B、hardness
C、Strength and toughness
D、heat resistance.
6、In cutting, the tool must have ( ) because it is subject to a great cutting force and impact.
A、sufficient strength and toughness
B、Wear resistance
C、heat resistance
D、hardness
7、The rake angle of the cutting tool affects the deformation in the cutting process, and the strength of the tool.
8、Though The buildup edge should be avoided during the finishing process, but it has some advantages to rough machining.
9、The radial thrust force Fp , which consumes no power, is the main reason that causes the machine tool vibration and affects the machining accuracy.
10、Diamond can cut various materials at 800℃
11、The cutting of stainless steel containing titanium should use YT carbide tool material
12、As the hardness of the workpiece increases, the cutting force will decrease
13、The hardness, wear resistance and heat resistance of cemented carbide are higher than that of high-speed steel.
14、For YT30 cemented carbide, the number 30 represents the percentage of Titanium carbide content.
15、For YG8 cemented carbide, the number 8 represents the percentage of Tungsten carbide content.
16、The metal deformation in the cutting area can be generally divided into three deformation regions. In the first deformation region, shear slip deformation mainly occurs
Basic knowledge in the metal cutting process（2）
1、What are the measure index of the degree of cutting deformation?
2、What are the main factors affecting the cutting force?
3、What are the essential properties of the tool materials?
Unit 3：Basic rules in the metal cutting process and their applications（2）
Basic rules in the metal cutting process and their applications（2）
1、To improve the machinability of low carbon steel, the heat treatment process usually used is ( ) .
A、quenching
B、tempering
C、annealing
D、normalizing
2、（ ） means the time required for the wear land to increase from zero to the wear criterion at which the tool is regarded as " dull" .
A、Homogeneous wear
B、Initial wear time
C、tool life
D、Machining time.
3、" wear criterion" means the allowable maximum value of average wear in the middle part ·of the wear zone on ( ) .
A、The major flank face.
B、the rake face
C、machining surface
D、The minor flank face.
4、When the rigidity of the process system is insufficient, the ( ) corner radius should be chosen.
A、Smaller.
B、Larger.
C、Zero.
D、any size
5、cutting fluidscommonly used are
A、extreme pressure emulsion or an anti-corrosion emulsion
B、Emulsions
C、Cutting oils
D、Water solutions
6、the causes of tool wear are
A、Abrasive wear
B、Adhesive wear
C、Diffusion wear
D、Phase change wear
E、Oxidizing wear
7、Cutting temperature is generally referred to chip temperature
8、Usually, the wear criterion for finishing is lower than that for roughing.
9、Cutting brittle materials, the flank wear is obvious
10、When roughing cast iron, the mainly cooling cutting fluid should be added with sufficient and uniform flow .
11、In cutting process, the more heat generated, the higher the cutting temperature is.
12、The tool life and cutting efficiency are related to the cutting performance of tool materials.
13、When rough machining, or bearing impact load, the major clearance angle should be larger so as to reduce tool friction and extend tool life.
14、The adhesive wear is generally more serious at the lower cutting speed.
15、The tool life of the highest productivity method is lower than that of the lowest cost method.
16、Due to poor heat resistance, cutting fluid should be used when cutting with high- speed steel tools
17、Due to its good heat resistance ,when cutting with carbide tools, generally do not add cutting fluid
18、When the main major cutting edge angle κr increases, the heat dissipation size of the tool bit increases and the cutting temperature decreases.
19、When cutting brittle metal, cutting heat mainly comes from deformation heat in shearing region.
Basic rules in the metal cutting process and their applications（2）
1、Does the amount of cutting heat generation accurately describe the temperature of the cutting area? Why?
2、What is the principle of rake angle selection ? What should be considered when selecting the rake angle?
3、What are the main indexes for judging machinability of workpiece materials ?
Unit 4：Machine tools and their cutting tools（1）
Machine tools and their cutting tools（1）
1、In the slide box of CA6140 , ( ) is to ensure that when thread machining, the motor-driven longitudinal and transverse feed movement will not be switched on .
A、互锁机构Interlock mechanism
B、开合螺母机构 Split nut mechanism half nuts mechanism
C、卸荷带轮unloading pulley
D、超越离合器 over-run clutch
2、In a transmission system, the motor transfer the motion to shaftⅠ through the belt, shaftⅠ transfer the motion to shaft Ⅱthrough double-sliding gears, motion connection between Ⅱ shaft and Ⅲ shaft through triple slip gears, shaft Ⅲ can be obtained. ( ) different speeds.
A、3
B、6
C、2
D、5
3、The function of spindle box for CA6140 machine tool is ( ).
A、Realize the longitudinal feed motion of the tool rest
B、Provide the spindle with forward and reverse speed at all levels
C、Realize the transverse feed motion of the tool rest
D、Realize the longitudinal and transverse fast feed motion of the tool rest
4、In CA6140 ,（ ） can automatically disconnect the motion to protect the machine tool in case of overload or accident .
A、safty clutch
B、mutual interlocking mechanism
C、overrun clutch
D、friction clutch
5、machining metric thread with P=3mm on CA6140 , transmission ratio of geometric sequence shifting group is
A、1
B、1/8
C、1/4
D、2
6、The spindle unit of CA6140 should poseess the features as follows:
A、high rotation accuracy,
B、sufficient stiffness
C、good vibration resistance.
D、high speed
7、For machine tool type CM6132, the letter M stands for grinder.
8、Turning metric threads with lead greater than 12mm on CA6140, the extended lead transmission route should be used.
9、When the transmission route of the transverse feed is consistent with that of the longitudinal feed, 2f横 =f纵，
10、The radial load caused by V belt is transferred to the box body to avoid the bending deformation of shaft Ⅰ.
11、When machining metric threads on the CA6140 , the changing gear kits used is 100/100×100/100
12、For machine tool CM6132, the main parameter 32 indicates that the maximum rotating diameter of the workpiece turned on the lathe is 32mm.
13、on CA6140, when clutch M5 is switched on to make motor driven longitudinal and transverse feed chain switch off, then motion is transfer to the thread rod so as to machine end face.
14、In CA6140, due to transmission ratios approximately arranged in an geometric sequence, the transmission ratio of the arithmetic sequence shifting groups increase or decrease exponentially .
Machine tools and their cutting tools（1）
1、What are the usages of the lead screw and the feed rod? If only one of them is used , what will happen ?
2、说明下列传动路线表达式中A、B、C、D、E表示的传动比以及轴Ⅳ可获得的转速级数。 In the figure，illustrate the following transmission ratio indicated by A, B, C, D, E, and the Ⅳ speed levels shaft Ⅳ obtained.
Unit 5：Machine tools and their cutting tools（2）
Machine tools and their cutting tools（2）
1、When machining helical cylindrical gear , additional motion to form spiral is ( ) .
A、primary motion
B、Compound forming motion
C、feed motion
D、Simple forming motion
2、Using a right-hand hob with the lead angle ω cuts a left-hand gear with the helix angle β , hob swivel-setting angle δ is:
A、ω
B、β
C、β-ω
D、β+ω
3、Gear hobbing is a kind of tooth profile machining method which makes use of a pair of ( ) gear meshing principle .
A、交错轴斜齿轮cross axis helical gears
B、平行轴斜齿轮 parallel axis helical gears
C、直齿圆柱齿轮 straight spur gears
D、圆锥齿轮 bevel gears
4、无心外圆磨床磨削等径轴时，导轮的回转运动可分解为控制工件回转的圆周进给运动和工件纵向进给运动。 Grinding equal diameter shaft on the centerless cylindrical grinder , The rotary motion of the guide-wheel can be divided into ( ), which control the workpiece rotation
A、circular feed motion and main motion
B、circular feed motion and longitudinal feed motion.
C、radial feed motion and longitudinal feed motion.
D、discontinued circular feed motion and longitudinal feed motion
5、范成法是利用齿轮的啮合原理进行切削的，只需一把滚刀具就能加工出（ 不同 齿数 ）的齿轮。 利用范成法滚齿时 Machining gear by the generating method， one hobbing cutter can machine gears with 齿轮模数不同，齿数不同 different module ，different number of teeth
A、different module and different number of teeth
B、the same module and different number of teeth
C、the same module and number of teeth
D、different module and the same number of teeth
6、Machining on surface grinding machine , the grinding method of grinding wheel is as follows:
A、longitudinal grinding
B、end-face grinding
C、infeed grinding
D、peripheral cylindrical surface grinding
7、When grinding a long cylindrical surface on a universal cylindrical grinder , there are following feed motions ( ) .
A、the workpiece rotation
B、the workpiece reciprocates longitudinally
C、intermittenttransverse feed motion of grinding wheel
D、the abrasivewheel rotation
8、Drilling holes in some large and heavy workpieces on the radial drilling machine, the workpiece is fixed, the spindle is moved to drilling .
9、Adjustment of hob swivel-setting angle should ensure that the spiral direction of the hob at the cutting point is consistent with the direction of the tooth length of the workpiece .
10、The grinding speed of centerless cylindrical grinding is the rotation speed of the grinding wheel .
11、The main motion of gantry planer is the reciprocating linear movement of the worktable, the main parameter is the maximum plane width
12、The main motion of the cylindrical grinder is the rotation of the workpiece.
13、The slotting machine is mainly used for machining the inner surface of the workpiece, and the main motion is the vertical reciprocal rectilinear motion of the tool.
Machine tools and their cutting tools（2）
1、How does a centerless cylindrical grinder round the workpiece?
2、The following figure is the transmission schematic diagram of hobbed helical gear.What are the transmission chains that form involute generating line and helix generating line along the axial direction ? and what are the properties of the chains?
Unit 6：Machine tools and their cutting tools（3）
Machine tools and their cutting tools（3）
1、When cutting helical gear on Y3150E, The speed ratios of the synthesis motion mechanism are as follows: The generating motion passing through the synthetic mechanism, its speed ratiois ( ) the additional motion passing through the synthetic mechanism, its speed ratio is ( )
A、1, 2
B、-1 ,2
C、2,1
D、2,-1
2、When cutting helical gear on Y3150E, The calculated relation between the both ends of the additional motion transmission chain is .
A、hob 1r--------workpiece 1/z r
B、hob 1r--------toolrest move f mm
C、too lrest move L mm ( lead of the helix for the workpiece)-------workpiece rotating additionally 1 r
D、main motor-------hob
3、For quenched gear, gear is usually machined by ( ) in order to obtain the higher tooth shape accuracy and correct the deformation caused by the heat treatment
A、hobbing
B、grinding
C、shaping
D、shaving
4、When cutting helical gear on Y3150E, the motion synthesis mechanism has motion input terminals and motion output terminals.
A、two , one
B、two, two
C、one, two
D、one, one
5、the movements required for gear processing on the gear shaper are::
A、插齿刀的上下往复——主运动 reciprocal motion of the slotting cutter--main motion
B、让刀运动 motion of the cutter relieving
C、圆周进给运动 Circular feed motion
D、Generating Motion
E、Radial cut-in motion
6、the transmission chains required for helical gear processing are
A、Main motion transmission chain
B、generating motion transmission chain
C、additional motion transmission chain
D、axial feed motion transmission chain,
7、The characteristics of grinding wheel are determined by abrasive, particle size, binder, hardness, structure, shape and size.
8、The major cutting edges of the end mill are on the cylinder, and the cutting edges on the end face are the minor ones.
9、Gear shaping machine can machine the worm gears
10、Commonly used high speed steel gear shaver can machine gear with the tooth surface hardness lower than HRC35.
11、The axial section of Archimedes worm hob is linear tooth shape
12、When the contact area between the grinding wheel and the workpiece is large, choose soft grinding
13、Form grinding or fine grinding, choose hard grinding wheel. Choose soft grinding wheel for rough grinding.
14、the hardness of the grinding wheel refers to the degree which abrasive particles fall off under the force of grinding
15、when cutting with fixed double edge boring tool, radial forces on the two cutting edges cancel each other to reduce the vibration, containing space for the chip is large, cutting efficiency is high
Machine tools and their cutting tools（3）
1、Y3150E加工直齿圆柱齿轮和斜齿圆柱齿轮所需要的运动链有何异同？ when processing straight gear and helical gear on Y3150E, what are the similarities and differences in transmission chains?
2、As concerned the principle, what are the gear grinding methods ?
Unit 7：The process planning of mechanical manufacturing（1）
The process planning of mechanical manufacturing (1)
1、关于工序正确的说法是： 。 The correct statement about operations is： .
A、只要工人、工作地点、工件这三者改变了任意一个则将成为另一工序 As long as the worker, working place and workpiece change any one of these three will become another operation.
B、若工人、工作地点、工件这三者不变，则认为是同一工序 If the worker, working place and workpiece these three factors are invariable, it is considered as one operation.
C、一个轴类零件，外圆在进行粗磨后，把工件卸下后进行淬火处理，然后取回在同一台磨床，由同一个工人进行精磨，则粗磨和精磨可认为是同一工序 If a shaft is carried out rough grinding and quenching first, then execute fine grinding by the same grinder, rough grinding and fine grinding can be considered as the same process.
D、A、B、C都正确 A、B、C are all correct.
2、在四爪单动卡盘上装夹工件对已加工表面进行找正时，一般采用 。 Clamping and aligning a workpiece on the four-jaw chuck, the common tool used is 。
A、划线盘 Tosecan
B、卡尺 Caliper
C、千分尺 Micrometer
D、百分表 Dial indicator
3、下列加工工序中 不是自为基准加工的。 Which of the following operation is not based on self-datum principle.
A、浮动镗刀镗孔 Bore a hole using a floating boring cutter
B、无心磨床磨外圆 Grind the cylindrical surface using a centerless grinder
C、齿轮淬火后磨齿面 Grind the gear tooth surface after quenching
D、浮动铰刀铰孔 Ream a hole using a floating reamer
4、轴类零件加工中，为了实现基准统一原则，常采用 作为定位基准。 When machining a shaft based on the uniform datum principle, is generally selected as locating surface.
A、选精度高的外圆 High precision outer cylindrical surface
B、选一个不加工的外圆 Rough outer cylindrical surface
C、两端中心孔 Center holes
D、选一个中心孔和一个不加工的外加工的外圆 A center hole and a rough outer cylindrical surface
5、在选择粗基准时，首先保证工件加工表面与不加工表面间的位置要求时，则应以 为基准。 If there is position accuracy requirement between the machining surface and non-machining surface, should be selected as the rough locating datum.
A、不加工表面 Non-machining surface
B、加工表面本身 Machining surface
C、精基准 Accurate datum surface
D、三者都对 All the options above are correct.
6、精车属于 。 Fine turning is .
A、粗加工 Rough machining
B、半精加工 Semi-finished machining
C、精加工 Finish machining
D、光整加工 Burnish machinig
7、减少辅助时间的措施有 。 Means to reduce auxiliary time include .
A、采用快速夹紧装置 Adopt quick clamping device
B、提高切削用量 Increase cutting capacity
C、多刀加工 Multi-tool machining
D、采用多工位机床 Adopt multi-station machine tool
8、对于加工质量要求较高的零件，应将粗、精加工分开，其主要原因是 。 Rough machining and fine machining should be seperated for high precision parts, the main reasons are .
A、能纠正工艺系统中机床的制造及安装调整误差 Can correct the manufacturing and installation adjustment errors of machine tools in the process system
B、能纠正工艺系统中夹具和刀具的制造误差 Can correct the manufacturing error of fixture and tool in the process system
C、能纠正在粗加工中所造成的误差 Can correct the error caused in rough machining
D、能及早发现毛坯的缺陷，并能合理使用设备 Detect the blank defects early, and use the equipment reasonably
9、选择表面加工方法时应主要考虑 。 Major considerations when selecting surface machining methods inlcude .
A、被加工表面的加工要求 Machining requirements for machined surfaces
B、被加工工件材料 Workpiece material to be machined
C、工件的生产纲领 The production expectation of the workpiece
D、现场生产条件 Work site production conditions
10、在加工质量方面，铣削和刨削一般同级，但对于尺寸较大的平面，由于刨削无明显的接刀痕，故刨削优于铣削。 In terms of processing quality, milling and planing are generally in the same level, but for large-sized plane, planing is better than milling because there is no obvious cutting marks.
11、粗基准在（同一定位方向上）只允许在零件加工工序中使用一次，不允许重复使用。 The rough datum surfaces can be used once.
12、基准不重合一般发生在①直接得到加工尺寸不可能或不方便，②在制定工艺规程时，要求定位基准单一以便减少夹具类型或进行自动化生产。 The datum does not coincide generally occurs in ①it is impossible or inconvenient to obtain the machining size directly, ②when design the procedures of process planning, there should be only one locating datum in order to reduce the types of fixture or conduct automatic production.
13、在两个不同的工序中，都使用同一个定位基准，即为基准重合原则 In two different operations, if the same locating datum is used, that is defined as the principle of datum coincidence.
14、用同一把外圆车刀分三次车削阶梯轴的同一个台阶，因切削用量变化，故称为三个工步。 When machining three different cylindrical surfaces of a stepped shaft with the same turning tool, there are three operation steps, as the cutting parameters have been changed.
The process planning of mechanical manufacturing (1)
1、粗基准和精基准选择原则有哪些？ State the selecting principles of rough datum and accurate datum.
2、在制订加工工艺规程中，为什么要划分加工阶段？ State the necessity of stage division when design the machining procedures.
Unit 8：The process planning of mechanical manufacturing（2）
The process planning of mechanical manufacturing（2）
1、采用工序集中原则的优点是 。 The advantage of adopting the process concentration principle is .
A、便于管理 Easy to manage
B、易于保证加工面之间的位置精度 Easy to ensure the position accuracy between machining surfaces
C、可以降低对工人技术水平的要求 Reduce the requirements of worker skills
D、可以减小工件装夹时间 Reduce the clamping time
2、工序集中的优点是 。 The advantage of adopting the process concentration principle is .
A、调整工作简单 Easy to adjust
B、机床和工装复杂 Machine tool and the craft equipments are complex
C、需要高技术操作工人 Skilled operators are needed
D、便于保证高的相互位置精度 Easy to ensure high mutual position accuracy
3、直线尺寸链采用概率法求解时，若各组成环均接近正态分布，则封闭环的公差等于： 。 When the linear dimensional chain is solved by probability method, if the component links are close to normal distribution, the tolerance of the resultant link is equal to .
A、各组成环中公差的最大值 The maximum tolerance among the component links
B、各组成环中公差的最小值 The minimum tolerance among the component links
C、各组成环公差之和 The sum of tolerances of all component links
D、各组成环公差的平方和的平方根 The square root of the sum of squares of the constituent link tolerances
4、为改善材料切削性能而进行的热处理工序（如退火、正火等），通常安排在 进行。 The process of heat treatment (such as annealing, normalizing, etc.) to improve the cutting performance of a material is usually scheduled to be carried out .
A、切削加工之前 Before cutting
B、磨削加工之前 Before grinding
C、切削加工之后 After cutting
D、粗加工后、精加工前 After coarse machining, and before fine machining
5、检验工序通常安排在 。 Measuring operations are usually arranged .
A、粗加工阶段结束 After coarse machining
B、车间转换前后 Before and after workshop conversion
C、重要工序前后 Before and after important process
D、全部工序结束 After all the operations
6、箱体加工采用“先面后孔”原则，是由于 。 For housing machining, planes' machining is performed prior to holes, because .
A、符合先粗后精 Rough machinig prior to finish machinig
B、符合先主后次 Primary surface machining prior to secondary surface
C、可简化夹具结构 Simplify the structure of the fixtures
D、有利于加工孔 Be beneficial to machining holes
7、影响最小工序余量的因素有 。 The factors that affacts the minimal operation allowance are .
A、前工序的表面粗糙度和缺陷层 Roughness and depth of defect layer produced by the preceding operation
B、上工序的工序尺寸公差 Tolerance of the operation dimension produced by the preceding operation
C、前工序的安装误差 Installation error of preceding operation
D、前工序形成的表面位置误差 Relative position error between preceding machined surfaces
8、工序分散原则是将加工内容分散在较多的工序中进行，每道工序的加工内容很少。 The principle of process dispersal is that the processing content is dispersed into many operations, and each operation has less processing content.
9、位置偏差是随机出现的，所以在制定加工余量时不需要考虑。 The position deviation appears randomly, so it is unnecessary to consider it when formulating the machining allowance.
10、工艺尺寸链组成环的尺寸一般是由加工直接得到的。 The dimensions of the process dimensional chain are generally obtained directly by machining.
11、直线尺寸链中必须有增环和减环。 There must be an increasing link and a decreasing link in the linear dimensional chain.
12、因为加工余量不是需要保证的加工要求，所以不能成为封闭环。 Because the machining allowance is not required to be guaranteed, it cannot be a resultant link.
The process planning of mechanical manufacturing（2）
1、A workpiece is shown as the figure below, the dimension 6±0.1mm should be ensured. Since this dimension is not easy to measure, it can be ensured by measuring L. Try to solve the dimension and tolerance of L.
2、
Unit 9：The design principle of jigs and fixtures（1）
The design principle of jigs and fixtures（1）
1、在平面磨床上磨削一平板，要求保证其高度尺寸，一般应限制工件的（ ）几个自由度。 To grind a flat plate on a surface grinder, its height and size should be guaranteed. Generally, how many degrees of freedom should be restricted?
A、A. 3
B、B. 4
C、C. 5
D、D. 6
2、机床夹具中夹紧装置应满足以下除（ ）之外的基本要求。 The clamping device in the fixtures should fulfill the following basic requirements except for ( ).
A、夹紧动作准确 Accurate clamping action
B、夹紧动作快速 Quick clamping action
C、夹紧力应尽量大 Clamping force as large as possible
D、夹紧装置结构应尽量简单 Clamping structure as simple as possible
3、工件在夹具中安装时，绝对不允许采用（ ）。 When the workpiece is installed in the fixture, it is absolutely not allowed to use ( ).
A、完全定位 Complete location
B、不完全定位 Incomplete location
C、过定位 Redundant location
D、欠定位 Insufficient location
4、下面对工件在加工中定位论述不正确的是（ ）。 The incorrect statement about the locating of the workpiece in the machining process is （ ）.
A、根据加工要求尽可能采用不完全定位 To adopt incomplete locating as far as possible according to machining requirements
B、为保证定位的准确尽可能采用完全定位 Complete locating should be adopted as far as possible to ensure the locating accuracy
C、过定位在加工中是可以使用的 Redundent locating can be used in machining process
D、在加工中严格禁止使用欠定位 Insufficient locating is strictly prohibited in machining process
5、工程上常讲的“一面两销”一般限制了工件的（ ）个自由度。 "one surface and two pins" generally limits ( ) degrees of freedom of the workpiece.
A、A.3
B、B.4
C、C.5
D、D.6
6、在车床上加工轴类零件的外圆，使用前后顶尖定位工件，则后顶尖即尾架顶尖所限制的工件自由度数为（ ）。 Machining the outer cylinder surface of shaft parts on the lathe and using the front and rear center to locate the workpiece, the rear center limits the workpiece by ( ) degrees of freedom.
A、A.1
B、B.2
C、C.3
D、D.4
7、在外圆柱上铣平面，用两个固定短V形块定位，其限制了工件的自由度数为（ ）。 Milling a plane on the outer cylinder surface and locating with two fixed short V-shaped blocks, ( ) degrees of freedom of the workpiece are restricted.
A、A.2
B、B.3
C、C.4
D、D.5
8、固定短圆锥销所限制的自由度数为（ ）。 ( ) degrees of freedom are restricted by fixed short taper pin .
A、A.1
B、B.2
C、C.3
D、D.4
9、工件在定位中出现欠定位，是因为（ ）。 The cause of insufficient location of the workpiece is ( ).
A、加工所要求限制的自由度定位中没有被限制 The degrees of freedom required for machining is not restricted in locating
B、实际限制自由度数少于六点 The actual degrees of freedom restricted are less than six
C、实际限制自由度数大于六点 The actual degrees of freedom restricted exceed six
D、实际被限制自由度数大于加工所要求的自由度数 The actual degrees of freedom restricted exceed the number required
10、在工件定位中，超过六点定位支撑点（ ）。 In the workpiece locating, if the supportting points exceed six, it is ( ).
A、一定是欠定位 Insufficient location
B、一定是完全定位 Complete location
C、一定是过定位 Redundant location
D、都有可能 Possible
11、过定位是不允许的 Redundant location is not allowed.
12、工程中工件“一面两孔”定位时削角销的方向无任何要求。 There is no requirement on the direction of rhombic pin when the workpiece is located by "one surface and two holes".
13、所有定位销的定位端头部均做成15度长倒角，以便于工件套入。 The end of all locating pins is made into a 15 degree long chamfer for easy fitting.
The design principle of jigs and fixtures（1）
1、什么是过定位？过定位在什么情况下允许在什么情况下不允许？ What is redundant locating? When it is allowed or not?
2、简述辅助支承的作用？ Briefly describe the role of auxiliary supporting.
3、消除过定位现象的方法有哪些？ How to eliminate the redundant locating?
Unit 10：The design principle of jigs and fixtures（2）
The design principle of jigs and fixtures（2）
1、基准不重合误差的大小主要与（ ）因素有关。 The value of non-superposition datum error is mainly related to ( ).
A、工序基准与定位基准间的尺寸变化量 The dimensional variation between the operational datum and the locating datum
B、本工序要保证的尺寸大小 The dimension guaranteed in this operation
C、本工序要保证的尺寸精度 The dimensional accuracy guaranteed in this operation
D、定位元件和定位基准本身的制造精度 The manufacturing accuracy of the locating element and the locating datum itself
2、在钻床上依次对同一孔进行钻、扩、铰加工时，通常使用（ ） ( ) is usually used when drilling, expanding and reaming the same hole in turn on the drilling machine.
A、快换钻套 Quick change drill bushing
B、可换钻套 Replaceable drill bushing
C、固定钻套 Fixed drill bushing
D、特殊钻套 Special drill bushing
3、三爪夹头夹外圆是属于（ ）。 The outer circle of three-jaw clip head is （ ）.
A、定心夹紧机构 Centering clamping mechanism
B、圆偏心夹紧机构 Circular eccentric clamping mechanism
C、螺旋夹紧机构 Screw clamping mechanism
D、斜楔夹紧机构 Wedge clamping mechanism
4、斜楔的楔角愈小，增力比愈（ ）；摩擦角愈大，增力比愈（ ） The smaller the wedge angle is, the force ratio is ( );The larger the friction angle is, t
学习通Fundamentals of Machine Manufacturing Technology
机械制造技术是现代工业的基础，在制造领域广泛应用。学习通Fundamentals of Machine Manufacturing Technology课程是一门介绍机械制造技术基础知识的课程，包括制造工艺、机床、数控技术、加工精度等方面的内容。
课程目标
本课程的目标是帮助学生了解机械制造技术的基础知识，包括：
- 传统制造工艺
- 机床的种类和原理
- 数控技术和数控加工中的编程
- 加工精度和表面质量控制
课程内容
本课程的内容主要分为以下几个部分：
传统制造工艺
传统制造工艺包括铸造、锻造、冲压、剪切、弯曲、焊接等，是机械制造中最常见的工艺。课程将介绍这些工艺的原理、特点和应用。
机床的种类和原理
机床是实现零件加工的设备，是机械制造中不可或缺的工具。本课程将介绍常见的机床种类和其工作原理，包括车床、铣床、钻床、磨床等。
数控技术和数控加工中的编程
数控技术是现代机械制造的重要组成部分，能够实现高效、精确、自动化的加工过程。本课程将介绍数控技术的基础知识和编程方法。
加工精度和表面质量控制
加工精度和表面质量是衡量加工质量的重要指标，对于机械制造品质有着重要的影响。本课程将介绍加工精度和表面质量的控制方法和标准。
课程特点
本课程有以下特点：
- 内容丰富：介绍机械制造技术的基础知识，全面了解机械制造的各个方面。
- 案例实践：通过实例演练加深学生对机械制造技术的理解和应用。
- 互动学习：学生可以和教师、同学进行互动，共同学习机械制造技术。
- 可在线学习：学生可以在任何时间、任何地点通过学习通学习本课程。
学习收获
通过本课程的学习，学生将会了解机械制造技术的基础知识，包括传统制造工艺、机床、数控技术和加工精度等方面的内容。学生还可以通过案例实践，加深对机械制造技术的理解和应用，为未来在机械制造领域的发展打下坚实基础。
结语
学习通Fundamentals of Machine Manufacturing Technology课程是一门非常好的机械制造技术基础课程，对于想要了解机械制造技术的学生和从事机械制造的技术人员都是非常有用的。通过这门课程的学习，可以对机械制造技术有更深入的理解和把握。
狭义的信息资源仅指信息的（ ）。
A.Which partner will bring you
B.智能滤镜只有智能对象才可以使用吗
C.枕左前位的分娩机制正确的是
D.梅毒患者的（ ）均有TP的存在。
泛义上讲，画素描对工具是没有限制的。
A.企业在制定信用标准时不予考虑的因素是( )。
B.人参的形态概况起来由芦、（ ）组成，各部位都有较特殊的形态。
C.胎膜早破的定义是破膜发生于
D.通俗地说，战略管理是要作正确的事，经营管理就是要正确地做事。
下列结构中的羰基红外吸收峰位于（）
A.两相交流伺服电动机与普通三相异步电动机相比，转子电阻比较大
B.在fopen函数中，“w”表示为________操作，打开一个文本文件
C.下列中成药中孕妇禁用,尤其驾驶员高空作业者慎用的是____
D.是一箭双雕的意思吗（ ）
光线投至物体，其表面显现出色彩、质地和肌理等状态的物理现象，就是（ ）。
A.适应大学生活，包括( )
B.PowerPoint是一个集成软件的一部分,这个集成软件是____
C.酶加速反应的机理是降低反应的活化能。
D.在不同的账务处理程序中，登记总账的依据相同。（ ）
边际技术替代率可以表示为两要素的
A.智慧职教: 功率场效应晶体管是一种单极型的电压控制器件
B.用彩色反转片拍摄的红花绿叶在底片上分别被记录为( )。
C.图像的基本处理可包括哪几个方面（）
D.下列属于批判性思维能力的是
某原子轨道用波函数表示时，下列表示中正确的是（）
A.在上述证明中，证明充分性，老师采用的是反证法证明的。
B.阳离子聚合一般需要在较低温度下进行才能得到高分子量的聚合物，这是因为（ ）
C.下列属于竹液体饮料的是 （ ）。
D.在同一转速时，节气门的开度越大，则汽油机的负荷（ ）。
敌我矛盾是分清是非问题，要运用专政来解决
A.当阻尼系数不同时，二阶系统的调节时间没有固定的表达式（）
B.我国根本制度是（ ）
C.锁相环路是由 （ ） 三部分组成的。
D.《高老头》是（）的作品。
竞技体育的特点有（ ）。
A.计划经济条件下，社会工作从业人员呈现出专业化的特点。
B.甲骨出土地是______(精确到省、市、村，如河南省三门峡市仰韶村）_
C.从分权理论看，宪法应该由制定者解释。 （）
D.设有int a=3,b;，则执行语句：b=!(a后，b的值是______。
879b02d50e6643feb07abb2fa58083bb.png
A.为慢性菌痢病人作保留灌肠，正确的是（）
B.太沙基单向固结理论假设受压土层的渗透系数为常数（）。
C.关于勘验、检査，下列哪一选项是正确的
D.呈味物质所处介质介质的粘度增加，味觉辨别能力降低。
我国人口老龄化的特点有哪些
A.拉压超静定问题求解时要用到那些关系（ ）
B.下列选项中在行政法上不具备行政主体资格的组织是
C.从本质上来说,资本主义强调资金具有()。
D.商家自配有利于品牌建设、容易保证配送质量。（）
渐进决策模型是美国经济学家（ ）提出的。
A.文化可分为评比性文化和非评比性文化（ ）
B.在培养自己的专业兴趣时,应该避免浅尝辄止。
C.某三体植物的染色体数目是25条，这种植物正常个体的染色体数是26条。（ ）
D.如果出口换汇成本低于计价货币汇率的买入价表明出口商存在盈利。
（ ）信号一般是没有用的而且有害的信号。
A.采用液压挺柱的发动机，不需要预留气门间隙。
B.烟气焓等于理论烟气焓、过量空气焓和飞灰焓三部分之和
C.谁在开封游方时看到了奇异景象
D.词语“歇息”、“心胸”、“新鲜”、“喧嚣”中各字的声母都是x。
地震后应积极开展互救，下列做法错误的是：
A.进行道德修养的根本途径是( )。
B.便利店可以采取区域集中的布局策略。（）
C.现金折扣是债权人为鼓励债务人
D.托盘需求量可以根据个人经验来确定。（ ）
下面哪些“三部曲”是巴金创作的（ ）
A.滇国又名滇越，又称“乘象国”。
B.肺吸虫从囊蚴进入人体到发育为成虫产卵约需2个多月。
C.三角针可以用来缝合韧带、皮肤、皮下
D.关于客户服务能力，以下看法中不正确的是（）。
