公差测量技术基础复习题及答案（Review and answer of tolerance measuring technology）

1、公差测量技术基础复习题及答案（Review and answer of tolerance measuring technology）Tolerance measurement technology basic review questions and answers.Txt my life has A side, also has the B surface, your life has S surface, also has the B surface. Failure is not terrible, the key is to see the success of his mother

2、. Todays college students are too lacking in quality! Come over and get the wool and cut it! Have the time to learn Feng Shui, after the death of a good tomb, but also make up for the lifetime can not afford to buy a good room regret. Review and answers to fundamentals of Exchangeability and measure

3、ment technologyFill in the blanks1. The amount of variation in the geometric parameters of a part is allowed (tolerance)2, according to the degree of interchangeability, the interchangeability of parts can be divided into (fully) interchangeable and (incomplete) interchangeable.3, the selection of c

4、ooperation method (calculation method) (experimental method) (analogy)4. Tolerance types include dimension (angle), tolerance, shape tolerance, (position) tolerance and (surface roughness).5, radial roller bearings (except tapered roller bearings) are divided into: (B) (C) (D) (E) (G) five grades, o

5、f which (B) class is the highest, (G) minimum.6, coordination refers to the (basic size) the same, the combination of the hole and the axis of the tolerance zone relationship.7, the smoothness limit gauge is abbreviated as (gauge), it is a special inspection tool for checking (hole, shaft parts) wit

6、hout (scale).8, according to the nature of the match, the coordination is divided into (GAP) coordination, (Guo Ying) coordination, (transition) coordination.9 when the gauge checks the size of the workpiece, the workpiece size is qualified if the (through) gauge can pass and the gauge cannot pass.1

7、0, in accordance with the characteristics of the structure, universal measuring instruments can be divided into (vernier, measuring), (micro motion spiral measuring tool), (mechanical measuring), (optical measuring), (pneumatic measuring tools), (electric measuring instrument)11, shape tolerances in

8、clude (straightness), (flatness), (roundness), (cylindricity), (line profile), (surface profile).12. The basic unit of length in an international system of units is (m)13 position tolerances include (parallelism), (perpendicularity), (inclination), (coaxiality), (symmetry), (position), (round jitter

9、), (full jitter).14, in the actual measurement, the commonly used (relative) truth, instead of the measured amount of verification for example, showing the value of micrometer, micrometer, gauge block size can be regarded as the true value (relative).15, thread according to its different uses, can b

10、e divided into (fastening) thread, (transmission) thread and (sealing) thread.16, the surface roughness Ra, Rz, Ry three height parameters, (Ra) is the main parameter17, the evaluation parameters of surface roughness are (Ra, average deviation (ten) micro roughness height (Rz), the maximum height of

11、 the profile Ry (Sw) the average distance outlinemicroscopic undulation), (single peak average pitch profile (S), supporting length ratio Tp)18, when the angle of the work piece to directly measure the general measuring instrument, if the angle accuracy is not high, commonly used (universal protract

12、or) measurement; otherwise, optical dividing head or angle (goniometer) measurement.19, the surface roughness detection methods are: (by light cutting roughness specimens - comparison of Comparative Law) (measured by profilometer - stylographic method) (with optical microscope measurement, optical c

13、utting method) (using interference microscope measurement interferometry).20 、 the type of key has (flat key) (wedge key) (Ban Yuanjian).21, flat key coordination is a kind of (base axis) system of coordination, there are only three kinds of coordination, (Jiao Song) key connection, (general) key co

14、nnection and (tight) key connection, in which (loose) key connection is gap fit. (general) key joint and (tighter) key connection are transition fit.22, the angle and taper detection methods (with a fixed value, measuring tool comparison) (direct measurement using a general purpose meter) and indire

15、ct measurement with general measuring tools23, flat and semi circle keys are by the key and keyway (side) surface transfer torque.24. The gauge for checking the maximum solid size of the workpiece is called (gauge). A gauge for measuring the minimum physical size of a workpiece is called a gauge.Two

16、 noun explanationOneBasic dimensions: (given size at design)2. actual size: (measured by measurements)3. dimensional tolerances: (allowance for dimensional variations)4. limit size: (allowing two extremes of dimensional change)5. upper deviations: algebraic differences between the maximum and minimu

17、m dimensions6. deviations: the algebraic difference between the minimum limit size and the basic dimension7. base hole system: (a basic deviation is a certain hole tolerance zone with different basic deviation of the axis of the tolerance zone, forming a variety of coordination of a system)8. base s

18、haft system: a system with various tolerances in which the tolerance of the shaft with the basic deviation is certain and the tolerance of the shaft with different basic deviations is formed9. graduation: the measured value represented by each scale interval on the ruler of a measuring instrument10.

19、 comprehensive measurement: (simultaneous measurement of several parameters on the part, so as to assess whether the parts are qualified)11. individual measurements: measurements of individual parts that are not individually connected to each other are measured12. contact measurement: measurement of

20、 the direct contact between the measuring head of the instrument and the surface of the measuring part13. non contact measurement: the measuring head of the instrument is not in contact with the surface of the part to be measured. )14. shape error: the variation of the ideal element by a single meas

21、ured actual factor. )15. positioning error: the variation of the ideal element that is determined by the actual factor to be determined. )16. surface roughness: the microscopic geometrical characteristics of tiny peaks and valleys that have smaller spacing on the machined surface.17. cone angle: the

22、 angle between two prime lines in the cross section of the cone axis.18. taper C: refers to the ratio of the difference between the cone diameter of the two vertical cross sections of the cone axis and the axial distance between the two sections.The size of a 19. hole: the size of the largest ideal

23、axis to be fitted to the actual hole on the mating length.The size of a shaft (the size of a perfectly ideal shaft that is externally joined to the actual axis)20. measurement error: refers to the difference between the measured value and the true value being measured.21. measuring range: (measuring

24、 instruments can measure the maximum and minimum measured)Three, Jane answer1, what are the basic principles of the selection of tolerance levels?Answer: in the first to meet the use of the requirements of the premise, as far as possible to reduce the accuracy requirements, so that the comprehensive

25、 economic effect is the best2, what is the principle of selecting the benchmark system?Answer: the main consideration of economic rationality and the structure of the process, in general, give priority to the use of the hole based system that can reduce the spare setting hole with kinds of cutting t

26、ools and measuring tools, good economic returns3, in those cases, the use of the basic shaft system?Answer: under the following circumstances, the use of basic shaft system1) directly with cold drawn steel axis, no longer processing2) and standard parts, such as rolling bearings, ring outer diameter

27、, standard cylindrical pin diameter and hole coordination.3) tolerances and fits of small dimensions in instruments, meters and clocks4) the same basic size, one axle is porous and the matching properties are different4, in the machining process, the roughness of the machined surface is what caused

28、it?Answer: This is due to plastic deformation, material marks, high-frequency vibration caused by process system, cutting tool and the machined surface friction and other reasons.5. What are the effects of surface roughness on the usability of the parts?Answer: it has the influence on the mating per

29、formance, wear resistance, corrosion resistance, contact rigidity, fatigue resistance, sealing and appearance of the parts.6. What are the principles of choosing the allowable values of surface roughness height parameters?Answer: the general principle is to meet the use of functional requirements on

30、 the premise, as far as possible to choose a larger priority value, specifically1) the allowable value of the roughness of the work surface on the same part shall be less than the surface roughness of the non working surface2) the allowable value of the roughness of the surface under cyclic loading

31、and the surface that causes stress concentration (such as fillet, groove) is small.3) with the same nature,The smaller the size of the component is, the smaller the allowable value of the surface roughness is than the larger size. At the same tolerance grade, the allowable value of the surface rough

32、ness of the axle ratio hole is smaller, and the surface roughness of the axle ratio hole is smaller than the same tolerance grade4) the movement speed is high, the unit pressure big friction surface should be lower than the movement speed, the unit pressure small friction surface roughness permissio

33、n value is small5) generally speaking, the surface shape accuracy requirements of high surface, surface roughness is small6) the processing method and the economic effect should be considered when the surface roughness is selected.7 what is the advantage of smooth cone matching in comparison with a smooth cylinder?Answer: 1) with high accuracy of coaxial 2) can guarantee repeated assembly accuracy is fixed 3) coordination of self-locking and good sealing 4) clearance or interference amount can be adjusted8. What is the significance of thread diame