Материал: 2177
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HOME TASK 14 |
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A. Memorize the words from Ex. I and be ready to do a dictation. |
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B. Combine the word ‘tool’ with other words (10 combinations). Use |
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them in the sentences of your own. |
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1. |
______________________tool_______________________________ |
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2. |
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3. |
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4. |
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5. |
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6. |
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7. |
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8. |
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9. |
б |
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10. ________________________________________________________ |
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C. Using Lessons 6 – 14, make a crossword puzzle (10 words from |
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Ex. I). Then let your groupmates do it. |
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TEST YOURSELF |
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In a CNC machine, tools are changed through program 1) ___. The |
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tools are fitted in a tool 2) |
or drum. When a tool needs to be 3) ___, |
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the drum 4) ___ to an 5) |
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position, approaches the 6) |
tool and 7) |
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___ it. Then it again 8)Аto the position of the 9) |
tool, fits it and |
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then 10) ___. This is a typical tool changing 11) |
of an automatic tool |
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changer. The concept of the ATC is that the 12) |
of tools for a 13) ___ |
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job shall be made available for automatic 14) |
and 15) |
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An Automatic Tool Changer cab be: |
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16) ___ Type (for holding small number of tools usually not more than 17) |
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___, stored on periphery of the 18) ___ and tool search speed is faster); |
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19) ___ Type (for more number of tools (20) |
or more), tools search |
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speed is less).
As soon as the 21) ___ command is received by the system, the 22)
___ tool comes to a fixed place known as 23) ___ position. The 24) ___
tool is transferred to the 25) ___ from the 26) ___ after the previous tool is transferred to the 27) ___ from the 28) ___. This is called 29) ___.
Automatic Tool Changer 30) ___:
(a)lines are changed in 31) ___ instead of 32) ___;
(b)operator 33) ___ is increased by changing tools 34) ___;
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(c)tools are changed in 35) ___ for maintenance and repair;
(d)36) ___ is increased;
(e)37) ___ and 38) ___ multi-tools are automatically exchanged.
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How many mistakes have you done? What are they? |
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What were the most difficult tasks for you? Why? |
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Lesson 15 |
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и |
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Refresh the words in Ex. I (Lesson 14) and get ready to have a |
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dictation. Do the crosswords of your groupmates. |
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I. Listen and repeat. Using the dictionary, write in the [træn'skripSn] |
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of the words into the table below. |
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1 |
facet |
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аспект, грань, сторона |
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2 |
verify |
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проверять, контролировать |
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3 |
continuous |
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непрерывный; длительный |
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4 |
enhanceб……………… |
увеличивать, усиливать, улуч- |
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шать |
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5 |
conventional |
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обычный |
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6 |
turning |
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Д |
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токарная обработка |
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7 |
facing |
А……………… обточка торца |
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8 |
boring |
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растачивание; рассверливание |
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9 |
grooving |
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нарезание пазов |
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10 |
knurling |
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накатка; рифление |
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11 |
threading |
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И |
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нарезка резьбы |
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12 |
drill and tap |
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сверлильно-резьбонарезной |
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center |
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многоцелевой станок |
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13 |
grinding |
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заточка |
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14 |
contour grind- |
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профильное шлифование |
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ing |
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15 |
fabrication |
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производство, изготовление |
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16 |
turret punch |
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револьверный дыропробивной |
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press |
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пресс |
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17 |
electrical dis- |
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электроискровая обработка |
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charge machin- |
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ing |
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18 |
cavity |
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полость; углубление; выемка |
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19 |
die set |
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пакет штампа; матрица и пуан- |
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сон в сборе |
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20 |
routing |
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вырезание изделий неправиль- |
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ной формы |
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II. Find the words in the text and translate the word combinations |
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with these words. |
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III. Work in pairs. Study the prompts in italics concerning the structure of complex sentences. Think of 2 or 3 complex sentences using the words from Ex. I. Ask your partner to translate them.
иCNC is automation of machine tools that are operated by programmed commands through a computer.
бThe computer produce a file that includes all the commands needed to operate a particular machine.
* Find complex sentences in the text below and translate them into Russian. А
IV. Read the text to answer the questions:
1. What are CNC machining centers used for? Give an example.
A.CNC is automation of machineДtools that are operated by programmed commands through a computer, as opposedИto manually controlled via handwheels or levers.
In CNC systems, end-to-end component design is highly automated using CAD/CAM programs. All the manufacturing operations are generated and verified in computer (CAM Software). The computer produces a file that includes all the commands needed to operate a particular machine. Then this file is loaded into the CNC machine’s computer for production. The computer on the machine keeps sending the instructions to the machine and the operation continuous same as verified in the computer software.
B.CNC has touched almost every facet of manufacturing. Many machining processes have been improved and enhanced through the use of
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CNC. Let’s look at some of the specific fields and place the emphasis on the manufacturing processes enhanced by CNC machine usage.
C. Machining processes that have traditionally been done on conventional machine tools that are possible with CNC machining centers include all kinds of milling like face milling, contour milling, slot milling, etc., and
Сdrilling, tapping, reaming, boring, and counter boring.
In similar fashion, all kinds of turning operations like facing, boring, turning, grooving, knurling, and threading are done on CNC turning centers. There are all kinds of special operations of these two machine types including CNC milling machines, CNC drill and tap centers, and CNC lathes. Grinding operations of all kinds like outside diameter (OD) grinding and internal diameter (ID) grinding are also being done on CNC grind-
ers. CNC has even opened up a new technology when it comes to grinding. |
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Contour grinding (grinding a contour in a similar fashion to turning) which |
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was previously infeasible due to technology constraints is now possible |
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(almostиcommonplace) with CNC grinders. |
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D. In manufacturing terms, fabrication commonly refers to opera- |
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tions that are performed on relatively thin plates. Sheets are sheared to size, |
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holes are punched in appropriate places, and the sheets are bent to their fi- |
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nal shapes. бAgain, operations commonly described as fabrication opera- |
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tions include shearing, flame or plasma cutting, punching, laser cutting, |
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forming, and welding. Truly, CNC is heavily involved in almost every fac- |
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et of fabrication. |
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CNC lasers and CNC plasma cutters are also used to bring plates to |
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А |
their final shapes. CNC turret punch presses can hold a variety of punch- |
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and-die combinations and punch holes in all shapes and sizes through |
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plates. CNC press brakes are used to bend the plates into their final shapes. |
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E. Electrical discharge machining (EDM) is the process of removing |
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metal through the use of electrical sparksДwhich burn away the metal. CNC |
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EDM comes in two forms, vertical EDM and Wire EDM. Vertical EDM |
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requires the use of an electrode that is of the shape of the cavity to be ma- |
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chined into the workpiece. Wire EDM is commonlyИused to make punch and die combinations for die sets used in the fabrication process. EDM is one of the lesser known CNC operations because it is so closely related to making tooling used with other manufacturing processes.
F. As in the metal removal industry, CNC machines are heavily used in woodworking shops. Operations include routing (similar to milling) and drilling. Many woodworking machining centers are available that can hold
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several tools and perform several operations on the workpiece being machined.
V. Choose the correct answer according to the information you have
read without looking back at the text. Discuss the results.
Сb) … handwheels or levers.
1. CNC is automation of machine tools that are operated by … a) …programmed commands through a computer.
c) … programmed commands via handwheels.
2.иMilling, drilling, tapping, reaming, boring, and counter boring are traditionally done…
a) on conventional machine tools. b) with CNC machining centers.
c) manually.б
3. OD is ..
a) … outside diameter. b) …operation design. c) … outlet discharge.
4. CNC machines are heavily used in…
a) metal removal industry and woodworking shops.
b) woodworking shops. |
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c) metal removal industry. |
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5. In CNC systems, all the manufacturing operations are generated and ver- |
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ified in... |
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a) …machining center. |
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b) …CAD/CAM program. И c) …computer.
VI. The text is divided into 6 parts (A – F). Give the title to each part.
A._________________________________________________________
B._________________________________________________________
C._________________________________________________________
D._________________________________________________________
E._________________________________________________________
F._________________________________________________________
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