Option 1

(1 question - 1 point)
A1. What is the depth of cut?
1) The thickness of the metal layer cut off in one working stroke of the cutter;
2) The allowance removed by the cutter in one or more passes;
3) A layer of metal removed from the workpiece with a cutter.

A2. The drill serves:
1) for finishing the hole;
2) to obtain a hole in a solid material;
3) for processing holes after casting and forging.

A3. What is the feedrate for threading:
1) the pitch of the thread being cut;
2) diameter for threading;
3) thread length;

A4. Specify the formula for spindle speed:
1) 13 EMBED Microsoft Equation 3.0 1415 13 EMBED Microsoft Equation 3.0 1415; 2) 13 EMBED Microsoft Equation 3.0 1415; 3) 13 EMBED Microsoft Equation 3.0 1415.
A5. Indicate how a long workpiece is fixed on a lathe:
1) in a three-jaw chuck;
2) in a three-jaw chuck with back center compression;
3) using a mandrel.

A6. The lathe caliper consists of:
1) Gear boxes, spindle, chuck;
2) Apron, slide, tool holder;
3) Cases, quills, plates.

A7. How to tell the difference between rough and finish taps in a set of two taps?
1) by type of tail;
2) by the slope of the chip groove;
3) by the type of the cutting part.

A8. Determine how you can eliminate the runout of a drilled hole:
1) reaming;
2) deployment;
3) boring.

A9. What causes the insert to be screwed in when threading?
1) by moving the caliper tailstock;
2) due to self-tightening of the die;
3) by moving the tailstock quill.

A10. What is meant by the main dimensions of the machine: 1) the diameter of the workpiece; 2) overall dimensions of the machine; 3) the height of the centers and the distance between the centers; A11. In what cases is countersinking used:
processing up to class 3 roughness;
2) to obtain holes with an accuracy of 0.05 mm and a finish of up to 5 roughness classes;
3) to obtain holes with an accuracy of 0.01 mm and a finish of up to 8 roughness classes;

A12. What surface accuracy and roughness can be obtained by drilling? 1) 5 class of accuracy, 3 roughness; 2) 3rd class of accuracy, 5th roughness; 3) 4th class of accuracy, 2nd roughness.

A13. Machine reamers are divided into:
1) wedge, keyway, vortex;
2) tail, mounted, with plug-in knives, adjustable;
3) belt, screw, rifle.

A14. Indicate among the listed threads indicated on the drawing "M10Ch1.5":
1) multi-start thread with a diameter of 10 mm and a thread lead of 1.5;
2) metric thread with a diameter of 10 mm and a fine pitch of 1.5 mm;
3) metric thread with a diameter of 10 mm and a coarse pitch of 1.5 mm;

A15. Select a thread designation with fine pitch if the thread is cut on a bolt:
1) M16-6g
2) M20x1.5-7H
3) M18x1.5-8g

IN 1. Write the name and purpose of the cutter elements:

IN 2. Write the name of the nodes and elements of the machine and their purpose

Part C. Solve the problem (1 question - 3 points)

C1. Determine the depth of cut when machining a part if the workpiece diameter is 54 mm and the workpiece diameter is 46 mm. Processing is carried out in 2 working steps.
C2. Determine the cutting speed and feed if the diameter of the workpiece being machined is 80 mm, the spindle speed is 500 rpm, in 2 minutes the cutter travels a distance of 200 mm. Processing is carried out in two working steps.

PM04 "Performance of work by profession turner"
MDK 04.01 Turning and equipment adjustment
Sample answers
Control work "Types of turning works"
Option 1
Part A

1
1
9
2

2
2
10
3

3
1
11
2

4
3
12
1

5
2
13
2

6
2
14
2

7
3
15
3

Part B
B1 1-main cutting edge
2- top
3- auxiliary cutting edge
4- holder
5- main back surface
6- auxiliary rear surface
7-front surface
8- cutting head

B2 1 - headstock
2- guitar
3- feed box
4- bed
5- caliper
6 - skid
7- tailstock
8 - electrical cabinet
C1 13 EMBED Microsoft Equation 3.0 1415mm 13 EMBED Microsoft Equation 3.0 1415mm.
С2 13 EMBED Microsoft Equation 3.0 1415 mm/rev 13 EMBED Microsoft Equation 3.0 1415 mm/rev.
13 EMBED Microsoft Equation 3.0 1415m/min 13 EMBED Microsoft Equation 3.0 1415m/min
Points
Grade

PM04 "Performance of work by profession turner"
MDK 04.01 Turning and equipment adjustment
Examination No. 4 "Types of turning works"
Option 2
Part A. Answers are given for each task of part A, of which one is correct
(1 question - 1 point)
A1. The feed box serves:
1) To control the rotation speed of the workpiece;
2) To control the speed of moving tools;
3) To control the rotation speed of tools.

A2. The headstock houses:
1) quill;
2) apron;
3) gearbox.

A3. Cutting conditions include:
1) depth of cut, feed, speed;
2) allowance, feed, spindle speed;
3) cutting depth, cutting force, cutting power.

A4. What types of chips are formed during cutting:
1) chipping, breaking, draining;
2) smooth tape, stepped;
3) shaped, drain, break.

A5. Specify the cutting speed formula:

1) 13 EMBED Equation.3 141513 EMBED Equation.3 1415; 2) 13 EMBED Equation.3 1415; 3) 13 EMBED Equation.3 1415.

A6. Specify the main cutting motion:
1) Movement of the tool fixed in the tool holder;
2) Moving the tool fixed in the tailstock;
3) Rotational movement of the workpiece.

A7. How are taper shank drills attached? 1) in a special mandrel with the help of cams; 2) in the tailstock quill using a drill chuck; 3) in the quill of the tailstock;

A8. What parts does a marker consist of?
1) cutting part, shank, gauge part;
2) cutting part, gauge part, neck, shank;
3) guide cone, cutting part, gauge part, reverse
cone, neck, shank.

A9. The main cutting edge is formed by the intersection:
1) Front and secondary rear surface;
2) Main rear surface and secondary rear surface;
3) Front and main rear surfaces.

A10. What are the parameters for threading?
1) outer diameter, inner diameter, average diameter, pitch, profile angle;
2) workpiece diameter, part diameter, thread length, number of thread starts;
3) outer diameter, inner diameter, lead angle, main thread angle.

A11. When is drilling used?
1) to obtain holes with an accuracy of 0.1-0.2 mm and a cleanliness
up to 3 roughness class;
2) to obtain holes with an accuracy of 0.05 mm and a cleanliness of up to 5 roughness classes;
3) to obtain holes with an accuracy of 0.01 mm and a cleanliness of up to 8 roughness classes;

A12. What is the surface finish achieved by finishing
boring?
1) Ra 12.5-25 µm;
2) Ra 6.3-12.5 µm;
3) Ra 1.6-3.2 µm;

A13. Specify the advantage of countersinking over boring:
1) higher performance;
2) eliminates the runout of the drilled hole;
3) allows you to get a higher surface finish.

A14. Indicate among the listed threads indicated on the drawing "M10":
1) multi-start thread with a diameter of 10 mm;
2) metric thread with a diameter of 10 mm;
3) modular thread with a diameter of 10 mm.

A15. Select a thread designation with fine pitch if the thread is cut into a nut:
1) M12-6g
2) M16x1.5-7H
3) M14x0.5-8g
Part B. Answer the questions (1 question - 2 points)

IN 1. Write the name and purpose of the incisors:

IN 2. Write the names of the drill elements

Part C. Solve the problems (1 question - 3 points)

C1. Determine the feed if, when processing a workpiece with a spindle speed of 800 rpm, the cutter for 2 minutes. travels a distance of 400 mm.
C2. Determine the depth of cut and spindle speed if the workpiece diameter is 25 mm, the workpiece diameter is 20 mm, and the cutting speed is 80 m/min. Processing is carried out in one working move.

PM04 "Performance of work by profession turner"
MDK 04.01 Turning and equipment adjustment
Sample answers
Examination No. 4 "Types of turning works"
Option 2
Part A
1
2
9
3

2
3
10
1

3
1
11
1

4
1
12
3

5
2
13
1

6
3
14
2

7
3
15
2

Part B
B1 1-boring grooving
2- boring for through holes
3-way thrust
4-way bent
5-flute
6- threaded
7-cut

IN 2
1 - working part
2 - foot
3 - neck
4 - cutting part
5 - shank
6 - rear surface
7 - angle at the top
8 - front surface
9 - ribbon
10 - angle of inclination of the helical groove
11 - the angle of inclination of the jumper
12 - jumper
13 - groove
14 - cutting edges

C1 13 EMBED Equation.3 1415mm/rev 13 EMBED Equation.3 1415mm/rev.
C2 13 EMBED Equation.3 1415mm 13 QUOTE 1415mm
13 EMBED Equation.3 1415 rpm 13 EMBED Equation.3 1415 rpm
Points
Grade

Root EntryEquation Native

Attached files

Introduction. 2

1. Purpose of the part and technical requirements to her 3

1.1 Material characteristics 3

1.2 Workpiece selection 3

2. Choice technological process 4

2.1 Technological bases 7

2.2 Equipment selection 8

2.3 Selecting the measuring tool 8

2.4 Choice of cutting tool 9

2.5 Choice of accessories 9

2.6 Calculation of cutting data 9

2.7 Types of possible marriage and ways to eliminate it 12

3. Organization of the workplace 13

References 14

Introduction.

The profession of a machine operator arose in the 17th and 18th centuries, since even then turning was understood very widely. It included, in addition to turning, also engraving, milling, planing. Turning masters of that time were, in fact, qualified engineers who were well acquainted with the basics of mechanics, mathematics and other sciences. The profession of a machine operator of a wide profile has arisen quite recently, and its appearance is natural, since such a worker with a wide range of labor functions is needed literally everywhere: at a machine-building enterprise and in a subway depot, at a shipyard and in a workshop for the repair of agricultural machinery, in construction organization and in a factory producing consumer goods.

The main labor functions of a machine operator are a complex labor functions each individual profession: turner, miller, driller, grinder. The work that the machine operator performs is very diverse: cut external and internal threads, process shafts, bushings, liners, cutting tools, various parts of machine tools, etc.

The workplace of a machine operator of a wide profile is a machine or a group of machines, permanent accessories to them, auxiliary tools and installation and fastening devices. The machine operator must be able to use a wide variety of cutting tools: cutters, drills, countersinks, reamers, cutters, dies, etc. The work of a machine operator is associated with the ability to read drawings, mentally represent the course of the technological process, determine the sequence of processing, and choose a cutting tool. For the profession of a machine operator, such psychological qualities of a person as long-term memory, imaginative thinking, eye, manual dexterity, a certain physical strength, and coordination of movements are important.

1. Purpose of the part and technical requirements for it

Shaft- a part of a machine or mechanism designed to transmit torque or torque along its center line. Most shafts are rotating (moving) parts of mechanisms; parts that are directly involved in the transmission of torque (gears, pulleys, chain sprockets, etc.) are usually fixed on them. Shaft specifications. Dimensional accuracy, shape accuracy, accuracy of the mutual arrangement of surfaces, the quality of the surface layer and the hardness of the material, as well as ensuring the coaxiality of the working surfaces and the perpendicularity of the working ends to the base surfaces. The following requirements are imposed on materials: high strength, good machinability, low sensitivity to stress concentration, as well as increased wear resistance.

1.1 Material characteristics

This shaft is made of steel 45 (GOST 1050-88)

Steel 45 - structural medium-carbon quality steel. Contains: 0.45% C (carbon), 0.5% Mn (manganese), 0.3% Si (silicon), 0.04% S (sulfur) and 0.035% P (phosphorus).

1.2 Workpiece selection

Detail drawing

Based overall dimensions parts (20x114mm) and machining allowance, the size of the workpiece will have the following dimensions: D=25mm, L=125mm,

2. Choice of technological process

Technological process(abbreviated as TP) is a part of the production process that contains actions to change and then determine the state of the subject of production, i.e., to change the size, shape, properties of materials, control and movement of the workpiece

Technological operation call the finished part of the technological process, performed at one workplace.

Operation, in turn, is divided into elements, the number of which varies depending on the volume and methods of its implementation. The main elements of the operation are the setup, technological transition, auxiliary transition, working stroke, auxiliary stroke, position.

Statutory call the part of the technological operation performed with the unchanged fixing of the workpieces being processed or the assembled assembly unit.

Technological transition called the finished part of the technological operation, characterized by the constancy of the tool used and the surfaces formed by processing and connected during assembly.

When the cutting mode or cutting tool is changed, the next transition starts.

Changing only one of the listed elements (worked surface, tool or cutting mode) defines a new transition. The transition consists of working and auxiliary moves.

Under working stroke understand the completed part of the technological transition, consisting of a single movement of the tool relative to the workpiece, accompanied by a change in the shape, size, surface roughness or properties of the workpiece.

Auxiliary move- the completed part of the technological transition, consisting of a single movement of the tool relative to the workpiece, not accompanied by a change in the shape, dimensions, surface roughness or properties of the workpiece, but necessary to complete the work stroke.

Position called each fixed position occupied by a permanently fixed workpiece or assembled assembly unit together with a device relative to a tool or a fixed piece of equipment to perform a certain part of an operation.

Page 1 of 5

1. What are the requirements for cylindrical surfaces?

1. cylindricity, straightness;
2. straightness generatrix, cylindricity, roundness, coaxiality;,
3. roundness, coaxiality, straightness;

2. What is a feed motion?

1. this is the movement of the cutter along the workpiece;
2. this is the translational movement of the cutter, which ensures continuous cutting into new layers of metal;
3. this is the cutting surface when processing;

3. What is called the front angle?

1. angle between front and back surface;
2. the angle between the front surface and the plane perpendicular to the cutting plane;
3. angle between the front surface and the cutting plane;

4. What tool is used to finish the hole?

1. drill;
2. countersink;
3. sweep;

5. The class of shafts includes parts in which:

1. the length is much larger than the diameter;
2. length is much less than the diameter;
3. length is equal to diameter;

6. Things to consider when using limbs:

1. the presence of lubrication;
2. the number of marks on the limb;
3. the presence of backlashes;

7. What kind of thread is characterized by a triangular pitch, a profile angle of 60˚

1. metric;
2. inch;
3. trapezoidal,

8. What is an allowance?

1. a layer of metal removed from the workpiece;
2. a layer of metal for processing;
3. a layer of metal that is removed from the workpiece in order to obtain a part from it;

9. What is called the geometry of the cutter?

1. cutter angles;
2. shape of the front surface;
3. the value of the angles of the head of the cutter and the shape of the front surface;

10. What steels are called alloyed?

1. steel smelted in electric furnaces;
2. steel containing alloying elements;
3. steels smelted in open-hearth furnaces

Home > Contest

Questions for preparationto the competition professional excellence(miller).

1. The concept of interchangeability.

   Measuring.

   Gauge control

   Metal properties

   Chemical-thermal treatment of steel. Purpose, types

   cutter geometry

   Cutting data for milling

   Uphill climb milling.

   Milling of flat surfaces (cutting tool, defects)

   Milling grooves and grooves.

   Cutting on a milling machine.

   Dividing heads. Polyhedron milling

   Safety precautions when working on a milling machine.

Application No. 7

Questions for preparation
to the competition of professional skills (turner).

Limit dimensions, limit deviations

1. Landings. Landings in the hole and shaft system, quality

   Deviations of the shape of cylindrical surfaces

   Deviations in the location of surfaces

   Designation on the drawings of the tolerances of the shape and the relative position of the surfaces.

   Surface roughness. Designation of surface roughness in drawings

   The concept of interchangeability.

   Measuring.

   Gauge control

   Means of control of angles, conical connections.

   Thread control tools, methods

   Metal properties

   Alloys of iron with carbon. Steel, cast iron. Classification, marking.

   Heat treatment of steel, defects, types.

   Chemical - heat treatment of steel. Purpose, types

   Non-ferrous metals and alloys (lat uni, bronze), marking.

   Tool materials (tool steels, hard alloys and cutting ceramics, - marking)

   Phenomena accompanying the process of cutting metals (types of chips, hardening, build-up)

   Turning tool geometry

   Cutting conditions for turning

   Processing of cylindrical holes (drilling, boring, countersinking, reaming). Types of marriage. The reasons.

Thread cutting (external, internal). Elements, designations.

Processing of conical surfaces (methods).

Safety precautions when working on lathes and grinding machines

Application No. 8

SCROLL

topics on theoretical issues for the city competition

professional skill among electric welders

city ​​of Almetyevsk in 2011.

Classification of the main methods of welding.

Requirements for welding arc power sources.

Welding converters.

Welding transformers.

Welding rectifiers.

Maintenance of welding equipment.

Metallurgical processes in welding.

Metallurgy of manual electric arc welding.

Electrodes for arc welding.

Classification of electrodes.

Assembly of the welded joint.

Seam technique.

Deformations and stresses during welding.

Defects welds. Their classification.

Control methods.

Safety requirements.

Electrical safety.

Fire safety.

Bibliography.

Fominykh V.P., Yakovlev A.L. "Electric welding": A textbook for vocational schools. - M .: "Higher School", 1973.

Levadny B.C., Burlaka A.P. "Welding works": - M., LLC "Adelant"; 2002.

Kolganov L.A. "Welding work. Welding, cutting, soldering, welding, Tutorial. - M .: Publishing and trading corporation "Dashkov and Co", 2003.

Nikolaev A.A., Gerasimenko A.I. "Electric and gas welder": A textbook for technical schools. - Rostov-on-Don: Phoenix publishing house, 2002.

Application No. 9

TERMS

citycompetitionprof. skill"Best in the profession"among electric welders

Date: March 26, 2011 Venue: base of NOU "TsPK-OAO "Tatneft" The competition consists of 2 parts: practical and theoretical. 1. Practical part: consists of welding a fixed joint of a pipe coil, diameter 1589 x 6.0 mm, made of carbon steel grade 10.20. A joint assembled for 3 tacks is provided for the competition. Evaluation of the results of the practical part of the competition includes the sum of points for the following indicators:

coil build quality: 10 points

For each comment minus 1 point

welding speed over time:

Welding time according to the norm (20 min. ± 2 min.) 10 points For 1 minute above the norm minus 1 point For 1 minute below the norm minus 1 point 1.3 seam quality during external examination:
If there are no defects 10 points If one acceptable defect is found minus 1 point. If one unacceptable defect is found, he is eliminated from the competition for a prize 1.4 workplace preparation: 4 points For each violation minus 0.5 points 2. Theoretical part reveals knowledge of the rules for the production of welding and installation work during the construction of pipelines, the device and principle of operation of welding units, the requirements for welding consumables (electrodes), their marking, existing methods for controlling the quality of welding joints. There are 20 questions in the ticket for testing theoretical knowledge. Estimated:

answer to 20 questions: 10 points

each wrong answer: minus 0.5 points

* Electrodes UONI 13/55 (packed) Ф 2.5-3.0 mm, and LB - 52Y Ф 2.6-3.2 mm.
Supply of electrodes centrally. * Coil length =125mm; Wall thickness S; S1 = 6.0 mm (without grooves);
Coil diameter = 159 mm b = 1.5 + 0.5 C = 1.0 + 0.5 Trim at ∟ 30° ±3°. Tack from 3 sides with tacks 30-40 mm long * The use of scientific and technical development that increases the degree of safety of the welder and the productivity of his work + 1 point (premium).

For violation of safety regulations during welding, penalty points are fixed: minus 0.5 for each violation.

According to the results of the competition, the commission determines the 1st, 2nd, 3rd places.

Appropriate prizes will be awarded.

The participant must haveto yourself:

qualification certificate, safety certificate;

standard set;

2 tacked pipe coils;

- for solemn building - special. clothes with distinctive signs of the organization.

№ cabins	Safety Compliance									Number of points
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)
	violations								8 (highlight)

In the absence of violations: 4 points In case of violation of safety regulations during welding, penalty points are taken into account: minus 0.5 points (for each violation). Violations: 1. Means personal protection: a) work without glasses; b) special clothes are not dressed according to the rules of TB (buttons must be fastened); c) lack of felt.

TB certificate expired.

The presence of combustible substances in the cabin.

Lack of standard.

Damage to the cable insulation.

The rheostat must be factory-made or issued with a rationalization proposal.

JOINT ASSEMBLY QUALITY

	Cabin No.		Checking the preparation of the joint for welding (VIK)	Number of points

If there are no defects: 10 points If there is one acceptable defect: minus 1 point

Requirements

to the assembly of the joint for welding

	Location of tacks
	Tack size (length)
	Edge offset
	Mismatch of longitudinal seams public report 11.6. Intra-university policy to support the scientific activities of scientists, young professionals and students, the activities of SSS them. I.S. Novitsky, activities of the Council of Young Scientists 227 Accept the annual report of the mayor on the results of his activities and the activities of the mayor's office of the urban district of Tolyatti for 2010 with a rating of "satisfactory" (Appendix No. 1). Mark the list of unresolved problems and propose to the mayor Document Having listened to and discussed the mayor's annual report on the results of his activities and the activities of the mayor's office of the urban district of Togliatti for 2010, including the resolution of issues raised by the Duma, guided by federal law from 06. Newsletter of local self-government Published by the ADG from okmo since February 2008 March 02, 2010 News bulletin Russian President Dmitry Medvedev issued a decree reorganizing his administration's department for dealing with citizens' appeals, the Kremlin's press service reported. Now it will be able to consider requests various organizations and force the municipalities

Application No. 3

LLC UPF "PROFESSIONAL" Exam questions on turning cause

What is the production and technological processes. Components of the technical process and its role in production. From the proposed process, analyze and explain one turning operation.

Classification of incisors according to purpose, material of the cutting part and design. Tell about the angles and elements of the turning tool through.

Methods for processing cylindrical parts, ends and ledges, cutting tools. Methods of control, types of marriage and its causes in the processing of cylindrical surfaces.

Grooving and cutting. Features of the geometry of cutting cutters and grooving cutters. Safety requirements for cutting parts.

Types of chips, work hardening and its effect on the cutting process. The durability of incisors and factors influencing its increase.

Safety rules for the processing of conical, stepped and cylindrical surfaces of parts fixed in centers and chucks when cutting threads with taps and dies manually.

Rules for installing a cutter and setting up a machine for cutting an external triangular metric thread.

Appointment and arrangement of 3 and 4 jaw and driver chucks, steady rests. Center types. Safety precautions when working with these devices.

Purpose and kinematic diagram of the lathe feed box (according to the scheme of the studied machine). What is called submission. #

Purpose and kinematic scheme of the gearbox of the lathe (according to the scheme of the studied machine). Determination of cutting speed when turning.

Purpose and design of twist drills. The order of choosing 5ora cutting modes when drilling. Causes of drill breakage.

Thread classification. Thread elements. The purpose and design of taps, threading techniques, control methods, types of marriage, the reasons for their occurrence.

Purpose and design of plates. The threading process, control methods, types of defects and their causes. Selection of hole diameters for threading.

Purpose and design of countersinks. Cutting mode, size of allowances, achieved classes of cleanliness and accuracy.

Application No. 3

Appointment and arrangement of the caliper, apron and tailstock of the lathe.

Purpose and design of reamers. Cutting conditions, allowances. Achievable purity and accuracy classes. Methods of control, types of marriage and the reasons for their occurrence.

The main components of the lathe and from the appointment. Rules for the care of the machine, lubrication points and its. frequency, name of the lubricants used.

Methods for obtaining short and long conical surfaces. Features of machining holes with a conical reamer on a lathe. Methods of control, types of marriage and the reasons for their occurrence.

Basic physical and mechanical properties metals.

How and what properties of metals are tested in the laboratory.

Basic technological properties of metals.

What is called cast iron, its varieties and main properties.

What is called steel, methods of steel production.

Methods for obtaining blanks in our factory.

What steels are called carbon steels. Basic properties and purpose of carbon steels (give examples).

What steels are called alloyed. Basic properties and purpose of alloy steels (give examples).

What chemical elements are used as alloying agents in the production of alloyed steels. Give examples of the influence of alloying elements on the quality of steels.

What are the properties and purpose of steels St 3, 45, U 7, U 8A, 37HNZA, R 9, G 13.

What is the composition and what metals are treated with hard alloys of the TK group (give examples).

What is the composition and what metals are treated with hard alloys of the VK group.

Give examples of grades of carbon, alloy steels and hard alloys from which cutting tools are made.

The main types of heat treatment and their brief characteristics.

What alloy is called bronze. The main properties of bronzes and their purpose. Determine the composition of bronze grades: BRAZHN 10-4-4, BROTs 10-2.

What alloy is called brass. The main properties of brass and their purpose. Determine the composition of brass grades: L 62, LAZhMts 70-6-3-4.

Basic properties of plastics and their application. Advantages and disadvantages of plastics.

Types of corrosion. What methods of protecting metals from corrosion are used in mechanical engineering.

Application No. 3

Tell us about the purpose of drawings in engineering, the general requirements for the implementation, execution and circulation of design documentation.

What is called scale. What scales are accepted at the factory and what are they called.

What are the basic principles of drawing dimensions on a drawing.

Give the definition of a species. The main types, additional, local - their definition and designation in the drawing.

What images of an object are called cuts, their classification and designation.

Make a sketch of the detail with the image of the section.

What is the difference between section and section.

Make a sketch of the part with the designation of the taper, the slope of the sides.

List the types of tolerance of the shape and location of surfaces, their designation in the drawing.

Make a sketch of the part with the designation of the perpendicularity tolerance.

Make a sketch of the part with the designation of the misalignment of the holes.

Draw and explain how the allowable end runout is indicated on the drawings.

Surface roughness. How roughness is indicated in the drawings: - surface, which. formed by removing a layer of material (turning, milling, etc.), a surface that

The image of the thread in the drawings. Classification of threads, designation on the drawings of external and internal threads.

formed without removing a layer of material (casting, forging, rolling).

Image on the drawings of welding joints.

General information about gears. As depicted in the drawings gear.

Sequence of reading assembly drawings.

What is the interchangeability of parts and how important is it in production. Complete and incomplete interchangeability.

What is called nominal and actual dimensions, upper and lower deviation? Determination of limit sizes.

What is called tolerance and its significance in mechanical engineering? Graphic representation of the tolerance field.

What is called a gap. What are the largest and smallest gaps. What is called tension. What are the largest and smallest tensions.

What is called landing. What groups are the landings divided into.

The device and purpose of the caliper. Terms of use and measurement accuracy. Read the set size.

The device and purpose of the height gage. Terms of use and