Tasks for mechanical engineering technology for SP. Collection of practical problems in the discipline "technology of mechanical engineering. The set of dimensions that form a closed contour and related to one part is called

Ministry of Education and Science of the Samara Region

GBOU SPO Togliatti Engineering College

Reviewed Approve

at the meeting of the MC Deputy. Director for NMR

specialty 151901 __________ Lutsenko T.N.

Protocol No. ______

"___" ___________ 2013 "___" ___________ 2013

MK Chairman

__________ / Bykovskaya A.V. /

Control and measuring materials

in the discipline "Technology of mechanical engineering"

specialties SPE: 151901 Mechanical engineering technology

for 4th year students

Developed by the teacher Ivanov A.S.

Specialty SPE: 151901 Mechanical Engineering Technology

Discipline: Engineering Technology

Section 1 Specification teaching elements

№ p / p

Name of training elements

(Didactic units)

The purpose of training

must know

Technological setup diagrams

must know

Time rate and its structure

must know

Machine assembly technology.

must know

Section 2 Test Items

Option 1

Block A

Assignment (question)

Sample answer

№ tasks

Possible answer

1-B, 2-A, 3-B

Set the correspondence between the name of the surface and the graphic image

1 - B;

2 - B;

3 - A;

4 - G.

IMAGE

Surfaces:

A) main

B) auxiliary

B) executive

D) free

Establish a correspondence between the name and the designation of the hotel

1 - G;

2 - D;

3 - A;

4 - B;

5 B.

Name

A) cylindricity

B) roundness

B) flatness

D) straightness

D) tolerance of the profile of the longitudinal section

Establish a correspondence, which varieties of directions of irregularities are indicated on the diagrams.

1 - B;

2 - D;

3 - G;

4 - A;

5 B.

Name of irregularities

parallel

crisscross

perpendicular

arbitrary

radial

Designation on the diagrams

BUT. G.

B. D.

The finished part technological process performed by a worker at one workplace is

operation

Serial production is characterized by

the number of products does not affect the type of production

The criterion for determining the type of production is

nomenclature of manufactured products and the coefficient of consolidation of operations

production cycle

3.qualification of workers

precision in metalworking can be achieved by methods

by the method of passes and measurements

on tuned machines

points 1 and 2

by measuring the treated surface

The minimum operating allowance for bodies of revolution is determined by the formula

roughness of the surface, not undergoing treatment, IS DECLARED BY THE SIGN

1. 3.

2. 4.all of the above

The base used to determine the position of the workpiece in the manufacturing process is called

design base

technological base

main base

auxiliary base

The operational time is determined by the formula

T OP = T O + T B

T DOP = T SB + T OP

T SHT = T O + T B + T OB + T OT

T Sh-K = T ShT + T P-Z / N

The base that deprives the workpiece of three degrees of freedom is called

double support

installation

guide

The base of the workpiece, which appears as a real surface, is called

open
measuring

Determine the type of production, if the coefficient of consolidation of operationsTO Z =1

small batch production

medium batch production

large-scale production

mass production

The set of all irregularities on the surface under consideration is called

non-straightness of the surface of the part

surface waviness

non-parallelism of part surfaces

surface roughness

The set of dimensions that form a closed contour and related to one part is called

dimension line

dimensional chain

size group

dimensional link

Define the term - total stock

Basis errors occur if they do not match

design and technological bases

technological and measuring bases

design and measurement bases

When choosing finishing bases when processing in all operations, it is necessary to use

the principle of combining bases

principle of constant bases

only installation bases

installation and design bases

The ability of a structure and its elements to resist the effects of external loads without collapsing is called

rigidity

steadiness

strength

elasticity

Block B

Assignment (question)

Sample answer

The limited application of the principle of interchangeability and the use of fitting work is characteristic of ____________

single assembly production.

The main basing schemes in metalworking are _________________________________________________

basing of prismatic blanks, basing of long and short cylindrical blanks.

The degree of conformity of the part given dimensions and the form, called ________________________________

processing precision.

The amount of movement of the tool per revolution of the workpiece is called ___________________

By designation, the surfaces of parts are classified into __________________________________________________

for basic, auxiliary, executive, free

The working drawing of the part, the drawing of the workpiece, the technical conditions, and the assembly drawing of the part are the initial data for the design _____________________________

technological process.

To compensate for errors arising in the selection of blanks, __________________________________

machining allowance.

A set of periodically alternating rises and troughs with a ratio is called _____________________

surface waviness.

One of the sizes forming a dimensional chain is called ________________________________

dimensional link.

Assembly of blanks, component parts or products as a whole that are subject to subsequent disassembly is called _________________________

pre-assembly

Option- 2

Block A

Assignment (question)

Sample answer

Instructions for completing tasks No. 1-3: correlate the content of column 1 with the content of column 2. Write in the corresponding lines of the answer sheet the letter from column 2, indicating the correct answer to the questions in column 1. As a result, you will receive a sequence of letters. For example,

№ tasks

Possible answer

1-B, 2-A, 3-B

Match: these formulas are used to determine which parameters of the workability analysis of a part

1 - G;

2 - B;

3 - A;

4 - B

Coefficient

A. Coefficient of machining accuracy

B. Coefficient of surface roughness

B. Material utilization rate

D. Coefficient of unification of structural elements

Establish a correspondence between the graphic designation and the name of the support, clamp and installation device.

1 - B

2 - B

3 - A

4 - D

graphic designation

1. 3.

Name

A - collet mandrel

B - floating center

B - fixed support

Г - adjustable support

Set the correspondence between the processing sketch and its name

1 - B

2 - D

3 - A

4 - B

Name

A. Parallel multi-tool single.

B. Sequential multi-tool single.

B. Parallel-sequential multi-tool single.

D. Parallel single-tool single

Instructions for completing tasks number 4-20: Select the letter corresponding correct option answer and write it down on the answer sheet.

- this is the formula for determining

piece time

main time

auxiliary time

technological standard of time

route map

process map

operating card

technological instruction

Machine tools, intended for the manufacture of products of the same name and different sizes

universal

specialized

special

mechanized

Determine the type of production, if the coefficient of consolidation of operations K Z = 8.5

small batch production

medium batch production

large-scale production

mass production

the surface roughness formed by the removal of a layer of material is indicated by the sign

2. 4.

Mass production is characterized by

narrow range of manufactured products

limited range of manufactured products

a wide range of manufactured products

various nomenclature of manufactured products

– this is the formula for determining

cutting speed

minute feed

spindle speed

cutting depth

An item or set of production items to be manufactured in an enterprise is called

assembly unit
product

4.set

Connections that can be disassembled without damage to mating or fasteners are called

mobile

detachable

one-piece

motionless

When planning the site in front of the machines, a working place is provided with a width

– this is the formula for determining

design tightness

tightness in conjunction

temperatures of mating parts

forces when pressing parts

Define the term - defective layer

metal layer intended to be removed in one operation

the minimum required metal layer thickness to perform the operation

surface layer of a metal, which has a structure, chemical composition, the mechanical properties are different from the base metal

metal layer intended to be removed during all operations

When basing the workpiece in the device according to technological bases that are not related to the measuring ones,

fixing errors

installation errors

processing errors

basing errors

Single, not regularly repeated deviations from the theoretical shape of the deviation surface are called

surface waviness

macrogeometric deviations

surface roughness

microgeometric deviations

The error that occurs before the application of the clamping force and during clamping is called

basing error

installation error

clamping error

fitting error

To ensure high hardness of the working surfaces of the teeth of the wheels, a type of heat treatment is used

carburizing followed by hardening

nitriding followed by quenching

cyanidation followed by quenching

oxidation followed by hardening

the property of a product that allows it to be manufactured and assembled at the lowest cost is called

repair manufacturability

production adaptability

operational adaptability

product manufacturability

Block B

Assignment (question)

Sample answer

Instructions for completing tasks No. 21-30: In the appropriate line of the answer sheet, write down the short answer to the question, the end of the sentence or the missing words.

For a clear illustration of the technological process, use ____________________

thumbnail map

Automated systems control of technological processes, in which the development of corrective actions on a controlled technological process occurs automatically, is called ________________________

managers

Surface irregularities formed as a result of the impact of the cutting edge of the tool on the machined surface are called _________________________

microgeometric deviations.

Deformation and wear of machine tools, wear cutting tool, clamping force, thermal deformations affect __________

processing precision

The product, the components of which are interconnected, are called ____________________________

assembly unit.

The technological process of manufacturing a group of products with common design and technological features is called ________________________

When processing the base surfaces of body parts, _________________________ is taken as the primary base.

rough main holes

A part formed from a set of bushings joined by rods are called ______________________

Compliance with the exact compliance of the technological process of manufacturing or repairing the product with the requirements of the technological and design documentation, called _________

technological discipline

Products that are not connected at the manufacturing plant, which are a set of products of an auxiliary nature, are called ______________________________________

set

Section 3 Codification System

Name of the didactic unit

Option number

Question numbers

Technological processes of mechanical processing

4; 5; 6; 10, 14, 25

Precision machining.

Surface quality of machine parts

The choice of bases when processing blanks

3, 12, 13, 18, 19, 22

Machining allowances

Design principles, rules for the development of technological processes

The concept of technological discipline

Auxiliary and control operations in the technological process

Calculations for the design of machine operations

Technological setup diagrams

Requirements for the development of calculation and technological maps for CNC machines

Time rate and its structure

Standardization methods labor processes, standards for technical regulation

Organization of technical and regulatory work at a machine-building enterprise

Methods for processing the main surfaces of typical machine parts

Programming of machining of parts on machine tools different groups

Technological processes, production of standard parts for general machine-building applications

Technological processes for the manufacture of parts in a flexible production system(GPS), on automatic rotary lines (ARL).

Computer-aided design of technological processes

Machine assembly technology.

11; 12; 14; 25; 30

Methods of implementation, production debugging of technological processes, control over the observance of technological discipline

Defective products: analysis of reasons, their elimination

Parcel Design Basics mechanical workshops

Section 4 List of used literature

Averchenkov V.I. and etc. Engineering technology. Collection of tasks and exercises. - M .: INFRA-M, 2006.

B.M. Bazrov Fundamentals of mechanical engineering technology. - M .: Mechanical Engineering, 2005.

Balakshin B.S. Fundamentals of mechanical engineering technology - M .: Mechanical engineering, 1985.

Vinogradov V.M. Engineering technology. Introduction to the specialty. - M .: Mechanical Engineering, 2006.

Gorbatsevich A.F., Shkred V.A. Course design in mechanical engineering technology - Minsk: Higher school, 1983.

Danilevsky V.V.... Engineering technology. - M .: graduate School, 1984.

Dobrydnev I.S. Course design on the subject "Technology of mechanical engineering". - M .: Mechanical Engineering, 1985.

Klepikov V.V., Bodrov A.N. Engineering technology. - M .: FORUM - INFRA-M, 2004.

A.A. Matalin Mechanical engineering technology - L .: Mechanical engineering, 1985.

Mikhailov A.V., Rastorguev D.A., Skhirtladze A.G. - Basics of designing technological processes of mechanical assembly production. - T .: Togliatinsky State University, 2004.

The solution of practical problems in all the main sections of the discipline "Technology of mechanical engineering" is given. Variants of individual tasks for practical work are given with a description of the methodology for their implementation on the example of solving one of the options for the task. The appendices contain normative and reference materials necessary for the implementation of practical work.
The textbook can be used in the study of the general professional discipline "Technology of mechanical engineering" in accordance with the Federal State Educational Standard of the SPO for the specialty 151901 "Technology of mechanical engineering".
To this study guide the electronic educational resource "Technology of mechanical engineering" was released.
For students educational institutions secondary vocational education.

DETERMINATION OF THE VALUE OF INCLUSIONS.
A workpiece is an object of production, the shape of which is close to the shape of the part, from which a part or one-piece assembly unit is made by changing the shape and roughness of surfaces, their dimensions, as well as material properties. It is generally accepted that a workpiece enters for any operation, and a part leaves the operation.

The configuration of the workpiece is determined by the design of the part, its dimensions, material and working conditions of the part in the finished product, i.e., all types of loads acting on the part during the operation of the finished product.
The original workpiece is a workpiece that enters the first step of the technological process.

The allowance is a layer of the workpiece material that is removed during its machining to obtain the required accuracy and parameters of the surface layer of the finished part.
An intermediate stock is a layer of material removed during one technological transition. It is defined as the difference between the size of the surface of the workpiece obtained in the previous operation and the size of the same surface of the part obtained when performing this transition on processing the surface of the workpiece in one operation.

TABLE OF CONTENTS
Foreword
Chapter 1. Fundamentals of mechanical engineering technology
1.1. Production and technological processes of a machine-building enterprise
Practical work No. 1.1. Study of the structure of the technological process
1.2. Determination of the size of the allowances
1.3. Calculation of the dimensions of the workpieces
1.4. Preliminary assessment of options for obtaining blanks
and their manufacturability
Practical work No. 1.2. Appointment of operating rooms
allowances for machining a part with a graphical representation of the location of allowances and tolerances for operating dimensions
1.5. The choice of bases when processing blanks
1.6. Sequence of operations
1.7. Selecting an installation base
1.8. Selecting a source base
Practical work No. 1.3. Basing workpieces in the processing area of the machine
1.9. Precision machining
1.10. Determination of the expected accuracy at automatic receipt coordinating size
Chapter 2. Technical regulation of technological operations
2.1. Piece time structure
2.2. Operations rationing
Practical work No. 2.1. Standardization of the turning operation of the technological process
Practical work №2.2. Standardization of the milling operation of the technological process
Practical work №2.3. Standardization of the grinding operation of the technological process
2.3. Development of operations
Practical work №2.4. Development of a cylindrical grinding operation of a technological process
Practical work №2.5. Development of surface grinding operation of the technological process
Chapter 3. Methods of surface treatment used in the manufacture of main parts
3.1. Manufacturing of shafts
3.2. Making discs
3.3. Gear making
3.4. Spur gear manufacturing
3.5. Bevel gear manufacturing
Chapter 4. Production of ring parts
Chapter 5. Manufacturing parts from sheet materials
Chapter 6. Selection of devices for basing (setting and fixing) workpieces
Chapter 7. Assembly of connections, mechanisms and assembly units
7.1. Route and assembly scheme development
7.2. Assembly Dimension Chains
7.3. Ensuring assembly accuracy
7.4. Control of assembly and technological parameters
7.5. Balancing parts and rotors
Chapter 8. Course Design
8.1. The main provisions of the course project
8.2. General requirements to the design of the course project
8.3. General method of working on a project
8.4. Technological part
Applications
Annex 1. Sample form title page explanatory note
Appendix 2. An approximate form of the assignment for the course project
Appendix 3. Units of measurement of physical quantities
Appendix 4. Rules for the design of the graphic part of the course project
Appendix 5. Tolerances in the hole system for external dimensions according to ESDP (GOST 25347-82)
Appendix 6. Approximate routes for obtaining the parameters of the outer cylindrical surfaces
Appendix 7. Approximate routes for obtaining the parameters of internal cylindrical surfaces
Appendix 8. Operational allowances and tolerances
Appendix 9. Time indicators of technological operations
Appendix 10. Specifications technological equipment and materials
Appendix 11. Cutting parameters and processing modes
Appendix 12. Indicators of accuracy and surface quality
Appendix 13. Dependence of the type of production on the volume of output
Appendix 14. Approximate indicators for economic calculations
Appendix 15. Methods of surface treatment
Appendix 16. Values of coefficients and quantities
Appendix 17. Brief specifications metal cutting machines
Bibliography.

Free download e-book in a convenient format, watch and read:
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Task 1.66 option 3.
Given: d (size of the base surface of the shaft) = 80-0.039 mm,
? (precision of the processing method) = 60 μm,
Life (permissible bushing wear) = 10 microns,
A2 = 50 ± 0.080 mm.
Determine the working dimension D of the centering sleeve, which ensures the specified accuracy of the A2 dimension when milling the groove.
Solution.
An analysis of the installation scheme shows that the accuracy of the hole diameter of the centering sleeve D affects the accuracy of the A2 dimension, given from the workpiece axis to the machined surface. It can be seen from the installation diagram that the fixing error (? S) for the A2 size is zero. Proceeding from this, as a starting point, we accept that the accuracy of the A2 size: TA2 =? BA2 + Tizn. +?, where? бА2 = ТD + Smin + Td - the error of the A2 size basing. The components TD and Smin are unknown quantities.
Solving the equality with respect to these unknowns, we get:
(Smin + TD) = TA2 - (Td + Life +?) = 0.16 - (0.039 + 0.010 + 0.060) = 0.051 mm.
From the tables of GOST 25347-82, select the hole tolerance field so that the condition is met: Smin + TD? ES.
Comparing the calculated value (Smin + TD) = 0.051 with the tabular value of the upper hole deviation (ES), I take the tolerance field G7 (), which can be taken as the actuator dimensions of the sleeve:
D = 80G7.

Task 1.67 option 3.
Given: mandrel material - steel 20X,
workpiece material - bronze,
E 1 (steel) = 210 GPa
E 2 (bronze) = 100 GPa,
? 1 (steel) = 0.3
? 2 (bronze) = 0.33
f bronze on steel = 0.05
u? 1,2 (Rz1 + Rz2)
d = 30 + 0.013mm
L = 40 mm
d1 = 70 mm
K = 2.0
Rz (mandrels) - 1.6
Rz (blanks) - 3.2
Pz = 240 H
Life = 10 microns.
Solution.
The starting point for performing calculations is the condition KMres = Mtr,
where: Мres = Рz - cutting moment when turning the surface
Мтр = lfp - friction moment of the contact surface of the workpiece with the mandrel.
р = - contact pressure on the interface surface.
Required smallest preload: Ncalc. min =

When using a solid mandrel: c1 = 1-? 1> c1 = 1-0.3 = 0.7
c2 = +? 2> + 0.33 = 1.78
Ncalc. min = = = 3.767
Taking into account the correction u for the height of the roughness crumpled during pressing, we find the value of the measured interference:
Nmeasure. min = Ncalc. min + u> 3.767 + 1.2 (1.6 + 3.2) = 3.767 + 5.76 = 9.5 μm;
From the tables of GOST 25347-82 we select the shaft tolerance field so that
(Td + Nmeasure min + Life)? Ei, where Life is the permissible wear of the mandrel.
In our case (13 + 9.5 + Life)? Ei.
For my version, the tolerance fields of the shaft (mandrels) can be taken
p5 () or p6 () with a permissible arbor wear of 3.5 μm.
Then the executive dimensions of the mandrel:
d = 30p5 () mm or d = 30p6 () mm.
Pressing force at the greatest interference, taking into account the safety factor K = 2: P = Kfp? Dl,
p => p = = = 15,
P = 2 · 0.05 · 15 · 3.14 · 30 · 40 = 5652H.

Task 1.57 option 1.
Given:? B = 0.05 mm,? Z = 0.01 mm,? S = 0.01 mm,? C = 0.012 mm,
Ng = 3000 pcs.,
Workpiece: material - non-hardened steel, hardness - HB 160, base surface - cylindrical, Тl = 0.2 mm.
Fixture: prism, Steel 20, hardness - HV 650, F = 36.1 mm2, Q = 10000H, L = 20 mm.
Processing method - milling with cooling,? (precision of the processing method) = 0.1 mm, tm = 1.95 min.
Determine the overhaul period of the device.
Solution.
Determine the permissible value [? And] by the equations:
? y = +>? y = + =
=0,051+
? y = Тl -?,> 0.051+ = Тl -?,> 0.051+ = 0.2-0.1>
> = 0.049> [? U] = = 0.04644 mm = 46.44 microns.
The permissible number of workpieces to be installed [N] up to the limit wear of the mounting elements of the device is found from the equation:
[N] =, from the reference book - we find m = 1818, m1 = 1014, m2 = 1309, wear resistance criterion P1 = 1.03, a correction factor that takes into account the processing conditions Ku = 0.9.
[N] = = = = 21716 pcs.
The overhaul period, which determines the need to replace or restore the installation elements of the device, is found from the equation:
PC = = = 73.8 months.

Target 1.43
Given: D1 = D2 = 50 + 0.039 mm, dts = dc = 50f7 mm,
ТL = 0.1 mm,? (precision of the processing method) = 0.050 mm.
Determine the accuracy of the size 70 of the connecting rod head and the possibility of processing the connecting rod surfaces with a set of cutters, observing the dimensional accuracy of 45 + 0.4 mm.
Solution.
Based on the installation scheme of the workpiece in the fixture, the positioning error when performing size 70 is determined by the equation:
? б70 = Smax = TD + Smin + Td = 0.039 + 0.025 + 0.025 = 0.089 mm,
Since the problem statement does not say anything about the fixation and position errors of the workpiece, then? Z =? P.z. = 0. Then
T70 =? B70 +? = 0.089 + 0.05 = 0.139 mm.
For size 45, a tolerance is added to the size between the axes of the holes, (it could also affect size 70 if the fingers did not have the same tolerance range):
? б45 = Smax = TD + Smin + Td + TL = 0.039 + 0.025 + 0.025 + 0.1 = 0.189 mm,
T45 =? B45 +? = 0.189 + 0.05 = 0.239 mm.
As you can see, the calculated tolerance is 0.239< 0,4 мм допуска заданного, следовательно, мы можем применить набор фрез для обработки головки шатуна.

Literature:
1. Machine tools. Directory. / Ed. B.N. Vardashkin et al. M., Mechanical Engineering, 1984.
2. The metalworker's handbook. / Ed. M.P. Novikova / M., Mechanical Engineering, 1977.