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Turning type. This APC has been developed for vertical turning. An indexing type direction changer with a loading/unloading device is located at the centre of the APC. One of the right and left sides permits setup and power rotation type centering work, the other side being used as a standby station.

СConveyor type. Two methods are available. In one method, a pallet or a workpiece is carried on a conveyor, positioned in front of the machining centre, and loaded to or unloaded from the machining centre. In the other method, a pallet is positioned and fixed on a conveyor and machining operation is performed by the motions of X, Y and Z axes of the machining centre. Inиthe latter method, the conveyor type APC constructs a flexible transfer line (FTL).

Line type. In this method, the machining centre, pallet stand and pallet magazine are disposed on one side or both sides of a linear track on which an unmannedбtrailer runs. There are two types of unmanned trailers; a single type which transfers one pallet, and a twin type which transfers two pallets. The twin-pallet changer can form the basis of flexible machining cells in which several machining centres carry out identical or successive operations on families of parts.АThe twin type unmanned trailer greatly reduces pallet changing time. In a factory automation type equipment which connects many machining centers a 100-m or longer line type FMS can be constructed by loading an unmanned trailer with a controller and power source, using a trolley type power supply, Дand employing an optical data transport system for the transfer of data with the CNC of the machining centre.

VI. Give the definitions to the following abbreviations. You may need to refresh the information from the previous texts.

CNC _______________________________________________________И; FMS _______________________________________________________; APC _______________________________________________________; FTL ________________________________________________________; MC ________________________________________________________; AWC _______________________________________________________; DNC _______________________________________________________; NC _________________________________________________________; CAM _______________________________________________________; CAD _______________________________________________________; AGV _______________________________________________________; VLSI _______________________________________________________.

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VII. Work in pairs. Read the description of one APC type and let your partner guess it.

VIII. Choose the best continuation without looking back at the text. Discuss the results.

С1. Robot type is used as a/an…

a) … automatic workpiece changer. b) …shuttle.

c) … combination of transfer bar and conveyor.

b)и… minimum of two machining centres. c) … maximum of two machining centres.

2. Rotary type can be connected with a ...

a) … maximum of three machining centres.

3. In a conveyorбtype a workpiece is positioned … a) … in front of the machining centre.

4. There are two types of unmanned trailers: … a) … a single type and a twin type.

b) … between the machining centres. c) … behind the machiningАcentre.

b) … a simple type and a dual type.

c) … a sequential type and a combinatory type.

5. The APC is available in … types.

IX*. Imagine you are an editor of a technical journal. You are to edit the text for the issue. Read the Google translation and correct the inaccuracies. Compare your translations with your groupmates and choose the best editor!

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HOME TASK 12

A. Memorize the words from Ex. I and be ready to do a dictation.

B. Make a plan to the text “Workpiece transfer technology” and be

Сready to discuss this topic in your group.

C. Make a PowerPoint presentation (10 slides) about APC types. You need to find some more facts yourself in the Internet. Remember to discuss the assessment criteria (4 – 5) beforehand.

TEST YOURSELF

The APC is available in many types. These types are used depending

___ machining centres. It is often connected with a setup station for 21) workpiece setup.

Square type is a 22) ___ type which loads and unloads pallets at 23)

___ places of X axis of the machining centre, i.e. loads from A and unloads from B. It 24) ___ loading/unloading and travel by 25) of transfer bar and conveyor.

Separate type is connected with a pallet 26) ___ which is equipped with a loading/unloading device in the 27) ___ direction of both ends of the X axis of the MC table, a large-sized type being used for 28) ___ boring machines. In this case, the 29) ___ type APC may sometimes be set on the extension side of the X axis.

How many mistakes have you done? What are they?

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Lesson 13

 1. Refresh the words in Ex. I (Lesson 12) and get ready to have a

dictation. 2. Share your PowerPoint presentations and be ready to answer the questions of your groupmates.

I. Listen and repeat. Using the dictionary, write in the [træn'skripSn] of the words into the table below.

II. Find the words in the text and translate the word combinations with these words.

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