1、机械制造装备设计（Mechanical manufacturing equipment design）Test 1, short answer questions (3 points per day, a total of 12 points)1. turret type combination machine tool can install several multi axle boxes on turret rotating worktable, and make each multi axle box turn to machining position in turn.The 2.
2、form of broaching cutter tooth and the outline workpiece surface shape is similar to that of the cutting tooth height increasing back margin, the workpiece was a layer to cut off by the last cutter tooth cut out the required size calibrated tooth repair light reaches the predetermined broaching mach
3、ining accuracy.3. machine tool fixture, machine tool fixture is used in machining to determine the correct location of the workpiece, and make the workpiece fixed to withstand cutting force, easy to accept processing equipment.4. the machine tool loading height refers to the vertical distance from t
4、he surface of the workpiece to the bottom of the machine.The 1. hole machining compound tool is processed by two or more individual holes, and the special cutter formed on the cutter body is called a hole cutting tool.The 2. fixture setting device enables the fixture to be positioned and fixed on th
5、e machine tool, that is to ensure that the fixture is in exact position and direction relative to the machine tool spindle (or tool) and the machine tool moving guide rail.3. machine tool productivity machine tool productivity refers to the number of workpieces that the machine can process in unit t
6、ime.4. machine tools pre assembly machine tools, in order to compensate for tool wear or manufacturing and installation errors, power components can be adjusted forward distance.1. the machine tool loading height refers to the vertical distance from the surface of the workpiece to the bottom of the
7、machine.2., the fixture positioning components can be installed workpiece, not only in the machine tool to determine the workpiece relative to the correct location of the tool parts.3. generating broaching cutter tooth profile broach and workpiece end surface shape is completely different, the cutte
8、r tooth made of linear or circular arc shape, the shape and size of the workpiece surface formed by the cutting edge of each side cutter tooth broaching.4. the machine tool contact dimension diagram is used to represent the configuration form of the machine tool, the relative position relation and t
9、he motion relation of each part of the machine tool.1. processes processing sketch map is a reflection of the parts to be machined, said the machining process on the machine tool, cutting tool and workpiece placement, fixture, tool relative position, the travel and work cycle of drawing machine.2. c
10、lamping device refers to the fixture used to determine the location of the drill bit and boring bar, increase its support, improve rigidity, ensure the hole processing position accuracy device.3. broaching graphics pull figure is the design of broaches, that broach broaching workpiece on the redunda
11、nt material in the order of graphics.4., the significance of the hierarchical drive structure represents the series of stages, the number of the speed change group and the number of its drive pairs, the transmission sequence and the transmission ratio of the speed change groups.Two, fill in the blan
12、ks (1 points per minute, 16 points)The 1. production line of process equipment (including fixture), (die), (2), (measuring) devices,Gauge.2., the overall design of modular machine tools, “three diagrams, one card“ refers to (processed parts, process plans), (processing drawings), (machine contact si
13、ze map), (machine tool productivity card).3. the workpiece is positioned on a rough base and a fine base plane, using a toothed head and a set of supporting plates as positioning elements;The workpiece is positioned with a coarse reference hole and a precision reference hole, and a positioning eleme
14、nt is provided by using a (expandable mandrel) and (positioning pin).4. in the screw plate clamping mechanism, parts 1, 2, 3, 4 respectively (the role of protection plate and avoid the bolt (bending), direct pressure (workpiece), supporting plate (unloading), workpiece holding plate).1. the overall
15、plan of the machine tool includes (Mastering the design basis of the machine tool), (process analysis), (overall layout), (determining the main technical parameters).2. the main technical parameters of the machine tool include (main parameter), (size parameter), (motion parameter), and (and dynamic
16、parameter).3., for different process requirements, drilling fixtures can be used (fixed drilling sleeve), (can change drill sleeve), (quick change drill sleeve), (special drill sleeve) drill sleeve.FourThe design of composite hole machining tool, choose a reasonable structure factors which should be
17、 considered: (tool strength and stiffness), (machining accuracy and surface quality) and (reasonable service life), (convenient sharpening).1. the workpiece is positioned on a rough base and a fine base plane, using a toothed head and a set of supporting plates as positioning elements;The workpiece
18、is positioned with a coarse reference hole and a precision reference hole, and a positioning element is provided by using a (expandable mandrel) and (positioning pin).2. the main content is to determine the structure scheme of machine tool fixture (workpiece positioning scheme), (tool knife or guide
19、 mode), (clamping workpiece) and other parts of the fixture structure, (clip structure specific).The main design points of 3. hole machining compound cutter include: choosing tool material reasonably, (selecting structure reasonably), (taking chip and chip removing), (ensuring good guidance), (deter
20、mining the length of tool correctly).4. thrust bearing in the spindle position affect the spindle axial accuracy and spindle (thermal deformation direction and size), design, general machine adopts (back end positioning), using CNC machine tools (front end positioning), combination machine adopts (t
21、wo ends).1. machine tool fixture design, commonly used positioning components are: (support nails), (support plate), (positioning pin), (V block).2. the main forms of transmission of machine tools are: (mechanical transmission), (hydraulic transmission), (electrical transmission).3. the basic requir
22、ements of the spindle assembly of the machine tool are (rotary accuracy), (stiffness), (vibration resistance), (temperature rise and thermal deformation), (accuracy retention)4., according to the technological requirements of different workpieces, broaching of broaches can be done in the form of (fo
23、rm), (gradually), (block type), and so on.Three, how to realize the lubrication of the gear in the multi axle box of the modular machine tool. How to design a handle shaft when designing multi axle box? What are the requirements for the design of the handle shaft? (12 points)Four, the machine tool u
24、sing a fixture processing a batch of workpiece, what will produce the error related to the fixture? What is their relation to the tolerance of parts? (15 points)1. on the machine tool using the fixture processing workpiece, the processing error factors are: workpiece positioning in the fixture when
25、the positioning error of delta D.W; workpiece clamping in the fixture when the clamping error J. I; fixture installation errors on the machine tools; J.A; the guidance error of the tool on the correct position of the fixture positioning element; the machining error caused by the wear of the clamp; J
26、.M. Among them, the positioning error of the workpiece includes the misalignment error caused by the misalignment between the design datum and the positioning reference, and the reference displacement error caused by the inaccurate manufacture of the positioning pair.The total difference between the
27、 2. clamps is related to the processing allowance of the workpiece:In addition to the jig, the machining errors related to all other factors in the process system. The following relations should be satisfied,Four, what is the fixture alignment? What aspects are included? Why do we need to solve the
28、fixture alignment problem when using the jig to process the workpiece? (15 points)1., the fixture and machine tool connection, so that the fixture positioning surface relative to the machine spindle (or tool), machine tool motion guide has accurate position and direction of the process known as the
29、fixture alignment.The 2. fixture on the set includes three aspects: one is the fixture on the machine tool, the positioning of the cutting forming movement that is a fixture fixture; two knife, the alignment of tool fixture; three is the indexing and transposition positioning, positioning fixture fo
30、r machining position.3. the use of fixture workpiece, only the first set of fixture in the machine, the error is less than to allow the workpiece on the determined error, can make the workpiece in the fixture relative movement and forming tool is in the correct position, namely the fixture. So as to
31、 ensure the machining accuracy and the accuracy of the machining positions.What parts are used in the milling machine jig?. It is necessary to design a milling drive shaft of the outer circle, axial notKeyway clamp,What kind of positioning scheme should be adopted to limit the degree of freedom of t
32、he workpiece? Draw a diagram, a jigWhat type of tool block is adopted? How is the fixture aligned on the machine?. (15 points)The jig of milling machine is mainly composed of clamping concrete, positioning device, clamping device, tool setting device, fixture, positioning key, etcA special fixture f
33、or milling the axial keyway of the drive shaft is designed. The outer circle of the drive shaft should be used as the main positioning datum, and the end face is the second positioning reference. The long V block is contacted with the outer circle of the shaft to limit the 2 movement and the 2 rotat
34、ional degrees of freedom, and the 1 moving degrees of freedom are limited by contacting a supporting nail with the end face of the shaft. Sketch map.See textbook selection, presetting device and setting device.Five,1 what are the power components in the modular machine tools? What are the motions of
35、 the machine tools? What are the main parameters and selection principles of power components? (15 points)1. the power unit of modular machine tools includes power slide and its matched power box and all kinds of single spindle cutting heads, such as milling head, drilling head and boring face.2. wh
36、en machining, the power box is driven by an electric motor to drive the multi axle box, and the main shaft of the driving tool is used for rotating main movement. The power slide drives the tool spindle to move in a straight line.The main parameters of the 3. power unit include the power of the moto
37、r that drives the power box, the axial feed force of the power slide, the feed speed and the feed stroke.According to the cutting power cutting tool spindle, calculate the total cutting power, and then consider the transmission efficiency or no-load power loss and load additional power loss, as the
38、selection of main drive motor power box types and specifications.The feed force calculates the axial cutting force F of each spindle according to the determined cutting amount. The model and specifications of the power slide are determined by the F F.According to the feed speed of fast travel speed
39、V table fast travel speed selection requirements of the V provisions of the minimum feed VF powerslider nominal (rated).The total stroke of the power unit determined in the feed stroke the maximum stroke of the selected power slide.2 what is the difference between the positioning and clamping of the
40、 workpiece in the fixture? To ensure that a batch of workpiece in the fixture in sufficient positioning accuracy, which two factors should be considered? What is the cause of the positioning error? (15 points)Answer: 1., the workpiece positioning in the fixture refers to determine a batch of workpie
41、ce in the fixture relative to the machine tool, cutter occupies the correct processing position. Clamping refers to the fastening of the workpiece on the fixture, to ensure that the workpiece under the cutting force in the process, still can be maintained by the positioning components of the process
42、ing position, without vibration or displacement.2. to reach sufficient precision to ensure that the workpiece positioning, not only need to limit the degree of freedom of the workpiece, the workpiece has a definite position in the machining direction, but also must try to reduce the positioning erro
43、r in the dimension on the direction of.3. there are two reasons for the positioning error when the workpiece is positioned:(1) the positioning datum does not coincide with the design datum, resulting in the positioning error caused by the misalignment of the datum.(2) because of the inaccurate manuf
44、acture of the positioning manufacture, the datum of the positioning datum is shifted relative to the starting position of the positioning element on the fixture, and the positioning error of the datum displacement is generated.Q: why do we need to design a chip separation groove for circular broachi
45、ng broach? What is the role of the calibrated tooth? Why is the corner angle of the round broach very small? (15 points)1. round broach broach is, when cutting steel and other plastic materials, cutting strip, in order to more smoothly. From the workpiece machining holes need to be wide chip divided
46、 into narrow width, in order to curl and accommodated in the groove, so in the round hole broach cutter teeth before and after on the staggered grinding chip split groove.2. in the round hole broach, the adjusting tooth one is able to repair the light, the calibration function, two is when the cutti
47、ng tooth because the regrinding diameter reduces, the calibration tooth may also be taken as the cutting tooth by turns.3., the cutting thickness of the broach (tooth lift) is very small, such as cutting principle to select the general principle of the back angle, you must take a larger rear angle.B
48、ut the general round broach regrinding rake angle value, after big, heavy grinding cutter diameter will decrease a lot, it can significantly shorten the service life of the broach, so broach cutter angle after the election should not be too large, the calibration tooth angle after the cutting angle should be smaller than.
