Mechanical engineering approval and landing programs. Program of the academic discipline tolerances and technical measurements work program on the topic

Bearings serve as supports for shafts and rotating axles. Rolling bearings are standard high-precision assembly units that are manufactured at specialized bearing factories using special high-precision equipment. Industry in the CIS countries produces bearings with outer diameters from 1.5 to 2600 mm. Bearings Ǿ20…200 mm are produced in large series. The bearings have full external interchangeability along the connecting surfaces, determined by the outer diameter of the outer ring and the inner diameter of the inner ring, and incomplete internal interchangeability between the rolling elements and rings. Lecture 7 Bearing rings and rolling elements are selected using a selective method. Full external interchangeability allows you to quickly install and replace worn rolling bearings while maintaining their good quality.

The accuracy of the geometric parameters of rolling bearings is determined by deviations in the following parameters: Width of the inner and outer rings B; Width of the outer ring C, if the inner ring has a different width; Nominal diameters of the inner ring bore and outer ring seating surface (d, D); Average hole diameters of the inner and outer rings (dm, Dm); dm=(dmax+dmin)/2, Dm=(Dmax+Dmin)/2, dmax, Dmax and dmin, Dmin – the largest and smallest diameters of the seating surfaces of the bearing rings.

Radial runout of the inner ring raceway relative to its bore Ri; Radial runout of the outer ring raceway relative to its outer cylindrical surface of the hole Ra; Mounting height of single row tapered roller bearing T; Inconsistency of the width of the Up ring. accuracy of form and relative position surfaces of bearing rings and their roughness; the accuracy of the shape and dimensions of the rolling elements in one bearing and the roughness of their surfaces; rotation accuracy, characterized by radial and axial runout of the raceways and ring ends.

Tolerance fields (GOST) for the housing and shaft and tolerance fields for the outer and inner rings of the bearing (GOST)

Influence of the accuracy class of a rolling bearing on the choice of landings For bearings of accuracy classes 0 and 6, the recommended set of tolerance fields for the seating surfaces is the same. For higher accuracy classes of rolling bearings, the set of tolerance fields for the seating surfaces changes somewhat; in particular, tolerance fields of more precise grades are used.

Influence of the type of loading of the bearing rings on the choice of fits The inner rings of the bearings rotate together with the shaft, the outer rings installed in the housing are stationary. The radial load P is constant in magnitude and does not change its position relative to the body. I scheme

II diagram Influence of the type of loading of the bearing rings on the choice of fits The outer rings of the bearings rotate together with the gear wheel. The inner rings of the bearings, mounted on the axle, remain motionless relative to the housing. The radial load P is constant in magnitude and does not change its position relative to the body

III diagram Influence of the type of loading of the bearing rings on the choice of fits The inner rings of the bearings rotate together with the shaft, the outer rings installed in the housing are stationary. The rings are subject to two radial loads, one constant in magnitude and direction P, the other, centrifugal Rc, rotating with the shaft. The resultant forces P and Pc perform a periodic oscillatory motion, symmetrical with respect to the direction of action of the force P.

is a small reference application for Android smartphones and tablets. It presents qualifications (all tolerance values provided by the standard) for part sizes from 1 to 500 mm. The directory is intended for specialists in the field of mechanical engineering who design or manufacture machine parts and various equipment.

The application serves as an analogue of reference data on the standardization of product sizes given in GOST or other technical documentation. The quality table in it contains rows with smaller size ranges and columns with designations of existing tolerances. Only a small portion of it is displayed on the device screen at a time, and to find the required values, you need to scroll up, down, or sideways. In this case, columns and rows with symbols remain attached to the edges of the window. To make it easier to find where they intersect, the backgrounds of neighboring cells slightly contrast with each other.

The application is distributed completely free of charge and does not contain advertising inserts. Searching for data in it is no more difficult than in a traditional paper directory. The table is designed in pleasant blue tones, with clear and easy to read black font. As disadvantages of the directory, some users note the lack of search and the ability to group columns. However, the application can be extremely useful for owners of outdated devices with not the best hardware - it launches quickly and does not require resources.

Designed according to standard curriculum academic subject“Tolerances, fits and technical measurements.” Reviewed in detail one system tolerances and fits, basic standards have been imposed on tolerances and fits of rolling bearings, keyed, splined and threaded connections, gears and gears, and plastic parts. The means of technical measurements of linear and angular dimensions are presented, and a method for their selection is given. The basic concepts of dimensional chains are considered. Intended for students of educational institutions implementing educational programs of vocational education.

PREFACE.

The content of the educational subject “Tolerances, fits and technical measurements” includes the amount of mandatory knowledge that must be acquired by a specialist and which he must be able to use without additionally resorting to reference books and textbooks. The peculiarity of the academic subject lies in the fact that it is necessary to remember a large volume of concepts, definitions, formulations, without which it is impossible to master the material. The purpose of studying this educational subject is to acquire the knowledge necessary for the correct selection of tolerances and fits, measurement of controlled parameters, a reasonable choice of measuring instruments and control methods, as well as the correct use of indications of controlled parameters in the drawing.

Free download e-book in a convenient format, watch and read:
Download the book Tolerances, landings and technical measurements, Zavistovsky V.E., Zavistovsky S.E., 2016 - fileskachat.com, fast and free download.

Heuristic tasks as a means of developing technical thinking among college students, Educational and methodological manual, Petrova S.D., Belonovskaya I.D., 2016
Preparing for the exam (test) on production organization, Gorelikova-Kitaeva O.G., Babin M.G., 2016
Atlas, Economic and social geography of Russia, grade 9, Outline maps, Alekseev A.I., Gavrilov O.V., 2016
Atlas, Economic and social geography of Russia, grade 9, Outline maps with tasks, Alekseev A.I., Gavrilov O.V., 2016

The following textbooks and books:

Calculation and modeling of linear electrical circuits using a PC, textbook for students of mechanical engineering universities, Gavrilov L.P., Sosnin D.A., 2010

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The academic discipline program was developed on the basis of the Federal State educational standard(hereinafter referred to as the Federal State Educational Standard) by profession of secondary vocational education(hereinafter referred to as SPO)

150709.02 Welder (electric welding and gas welding work), enlarged group of professions 150000 Metallurgy, mechanical engineering and metalworking

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ACADEMIC DISCIPLINE PROGRAM

2015

The academic discipline program was developed on the basis of the Federal State Educational Standard (hereinafter referred to as the Federal State Educational Standard)by profession of secondary vocational education (hereinafter referred to as SVE)

150709.02 Welder (electric welding andgas welding works), enlarged group of professions 150000 Metallurgy, mechanical engineering and metalworking

Organization - developer: GBPOU "Saratov Construction Lyceum"

Developer: Savenkov V.A., special education teacher disciplines

		page
	PASSPORT OF THE ACADEMIC DISCIPLINE PROGRAM
	STRUCTURE AND CONTENT OF THE ACADEMIC DISCIPLINE
	CONDITIONS FOR IMPLEMENTING THE ACADEMIC DISCIPLINE

1. PASSPORT OF THE ACADEMIC DISCIPLINE PROGRAM

TOLERANCES AND TECHNICAL MEASUREMENTS

1.1. Scope of application

The academic discipline program is part of the training program for qualified workers serving in accordance with the Federal State Educational Standard in the profession of SVE Welder (electric welding and gas welding work)

1.2. The place of discipline in the structure of the main professional educational program the discipline is part of the general professional cycle

1.3.Goals and objectives of the discipline - requirements for the results of mastering the discipline:

be able to :

Monitor the quality of work performed.

As a result of mastering the academic discipline, the student must know:

Tolerance and landing systems, processing accuracy, qualifications, accuracy classes;

Tolerances and deviations of the shape and location of surfaces.

The student’s maximum academic load is 48 hours, including:

obligatory classroom teaching load of a student 32 hour ;

independent work of the student 16 hours.

2. STRUCTURE AND CONTENT OF THE SCHOOL DISCIPLINE

2.1. Scope of academic discipline and types academic work

Type of educational work	Volume hours

Mandatory classroom teaching load (total)
including:
practical lessons
Independent work of the student (total)
Final certification inform of differentiated credit

2.2. Thematic plan and content of the academic discipline “Tolerances and technical measurements”

Name of sections and topics			Hours volume	Mastery level

Topic 1. General information about tolerances and technical measurements
		Tolerances and technical measurements. Concept, purpose of study, content, history of development
	Preparation of a report on the topic “Contribution national science in the formation and development of standardization" Compilation of a summary on the topic “Product Quality Certification”
Topic 2. Linear dimensions
		Linear dimensions. Nominal, real, limit. Deviations of linear dimensions: upper limit and lower limit. Tolerances of linear dimensions; tolerance range
		Fit as a mating of two parts. Types of fits: with clearance, interference and Transitional System holes and shaft system. Quality
	Practical lesson
		Determination of deviations and tolerances of linear dimensions in assembly and welding drawings using ESDP tables
		Calculation of maximum dimensions, tolerances and fits of connected elements.
		Performing a graphical representation of tolerance fields for various connections.
	10-11	Solving variable problems on the topic: “Determining the suitability of parts based on the results of their measurements
	Compilation of notes on the topic " Graphic image dimensions and tolerance deviations.” Preparation of a report on the topic “Application of standard tolerance and landing systems”
Topic 3. Tolerances and fits of smooth cylindrical joints
		Tolerance and landing systems. Size intervals, accuracy ranges, main deviations.
		Maximum size deviations. Use of tables, calculation, application and designation of landings on drawings. Plantings of preferred use.
	Practical lesson
	14-15	Determining the nature of the connection by the designation of the fit in the drawing
	16-17	Solving variable problems on the topic: “Tolerances and landings.”
	Independent work of students. 1. Drawing up a summary on the topic “Combined plantings.” 2. Preparation of a report on the topic “Dimensional deviations with unspecified tolerances”
Topic 2.2. Tolerances of shape and location of surfaces
		Classification, designation and drawing Tolerances and deviations of the shape and location of surfaces
		Parameters and designation of surface roughness. Basic requirements for accuracy
	Practical lesson
	20-21	Determining tolerances and surface locations in drawings.
	Independent work of students. 1. Drawing up a summary on the topic “The influence of roughness on the performance properties of parts”
Topic 3.1. Basics of technical measurements
		Tools for measuring linear dimensions. Plane-parallel gauge blocks, caliper tools, micrometric tools, bore gauges, depth gauges. Universal welder template
		Tolerances and means of measuring angles and smooth conical joints. Squares, protractors and goniometer tiles
	Practical lesson
	24-25	Selection of measuring instruments according to the drawing using tables of maximum instrument errors and permissible measurement errors
	26-28	Measuring linear dimensions using universal measuring instruments
	29-31	Measuring angles and determining the taper of a part using a square and protractor
	Independent work of students. 1. Preparation of a report on the topic “Metrology: basic definitions; methods and types of measurements; measurement errors"
	Test
Total

To characterize the level of development educational material The following notations are used:

1. – familiarization (recognition of previously studied objects, properties);

2. – reproductive (performing activities according to a model, instructions or under guidance)

3. – productive (planning and independent execution of activities, solving problematic problems)

3. CONDITIONS FOR IMPLEMENTING THE SCHOOL DISCIPLINE

3.1. Minimum logistics requirements

The implementation of the academic discipline requires the presence of a classroom “Tolerances and technical measurements”.

Classroom equipment:

seating according to the number of students;
teacher's workplace;
set of educational and visual aids “Systems of tolerances and landings”: GOST 2789-73, GOST 2.309-73, reference tables for definition maximum deviations, nomograms of the main (positions of tolerance fields) for diameter intervals, assembly drawings of welded structures, stands with measuring and micrometric tools, parts with different surface treatments
set of measuring instruments: tape measure type NR and RZh, calipers, height gauge, micrometer, universal welder's template, square, protractor.

Technical training aids:

a computer with licensed software and a multimedia projector.

3.2. Information support for training

Main sources:

Zaitsev, S. A., Kuranov, A. D., Tolstov A. N. Tolerances, fits and technical measurements in mechanical engineering. – M.: JIC Academy, 2012.
Bagdasarova, T. A. Tolerances, landings and technical measurements. Workbook. – M.: JIC Academy, 2010.

Additional sources

Zaitsev, S.A., Gribanov, D.D., Merkulov R.V., Tolstov A.N. Instrumentation and instruments. – M.: JIC "Academy", 2010.
Zaitsev S. A., Tolstov A. N. Metrology, standardization and certification. – M.: JIC “Academy”, 2009.
Bagdasarova, T. A. Tolerances, landings and technical measurements. Control materials. – M.: JIC Academy, 2010.

Electronic resource:

http://gost.prototypes.ru

4. CONTROL AND EVALUATION OF THE RESULTS OF MASTERING AN ACADEMIC DISCIPLINE

Control and evaluation the results of mastering the academic discipline are carried out by the teacher in the process of conducting practical classes, testing, as well as students completing individual assignments.

Learning outcomes (mastered skills, acquired knowledge)	Forms and methods of monitoring and assessing learning outcomes
Be able to:
control the quality of work performed	practical work
Know:
tolerance and landing systems, processing accuracy, qualifications, accuracy classes	practical work, test tasks, independent work
tolerances and deviations of the shape and location of surfaces	test tasks, practical work, differentiated testing, independent work