- •Основы проектирования и конструирования
- •Санкт-Петербург
- •1. General guidelines
- •1.1. Objective and purposes of the coursework
- •1.2. Content and scope of the coursework
- •1.2.1. Explanatory note
- •1.2.2. Graphic portion of the course work
- •1.3. Selection of task for the course work
- •2. Guidelines of calculation portion of the course work
- •2.1. Electric-motor selection
- •2.2. Reduction unit kinematical and capacity calculations.
- •2.3. Toothed gear drive calculation
- •2.3.1. Assessment of permissible stresses
- •Permissible stresses for surface load durability
- •Permissible stresses for bending fatigue strength
- •Designedcalculationofhelicalgear
- •2.3.3.Testbendingfatiguestrengthcalculation
- •Designs of cylindrical gearings
- •2.3.4. Reduction unit wheels layout method
- •Calculation of forces acting in cylindrical toothed gears coupling
- •2.4. Design-basis calculation of the shafts
- •2.5. Selection of rolling bearings
- •Extension to reduction unit layout Slow speed (output) shaft.
- •Draw shaft diameter for the wheel of
- •(Fig.8)
- •2.6. General recommendations for the design of reduction unit housing elements
- •Inner walls of the housing mate the radius . (Fig.9)
- •2.7. Selection of tab
- •2.8 Test calculation of output shaft fatigue strength
- •Values и for the shafts with tab groove, made by end milling cutter
- •3. Guidelines to execution of graphic portion of the course work
- •4. Requirements to coursework completion
- •4.1. Requirements to explanatory note execution
- •4.2. Requirements to completion of coursework graphic section
- •5. Suggested reading
- •Example of title sheet execution for explanatory note to the coursework
- •Explanatory note to the coursework under the following topic:
- •Saint-Petersburg
4. Requirements to coursework completion
4.1. Requirements to explanatory note execution
Text of explanatory note has to be typed on PC and printed on standard A4 format sheets; it’s permissible to prepare it in writing. The text should be generated in required logic sequence, adding explanations and references to literature sources used.
Conventional letter based symbols shall comply with applicable standards.
In general cases calculations shall contain the following:
sketch drawing or diagram of product under calculation;
calculation assignment indicating parameter to be defined during calculation;
data for calculation;
calculation.
Sketch drawing or diagram of product can be drawn in a free scale, ensuring clear presentation of calculated product.
Transcript of symbols included into formula (if used in the text for the first time) shall be indicated under formula directly.
All calculations shall be performed in SI units. Sufficient accuracy requirement is to keep three sound digits, excluding geometrical dimensions of inter-axial spacing and wheel diameter, where accuracy of two decimal places of mm has to be provided.
Calculations should be presented in the following way: firstly, values to be calculated are written in general manner, then all values are lined up in the same order as they are arranged in formula, and then the final result of calculation.
Words abbreviation in the text of explanatory note is not allowed, excluding generally common cases like etc.
Information regarding literature source shall contain the following: last name and initials of the author, title, place of printing, publication house, year of publication.
All pages of explanatory note shall have continuous numbering (title sheet is considered to be first page without any page number on it).
4.2. Requirements to completion of coursework graphic section
Assembly drawing shall be generated in 1:1 scale. In some cases increased or reduced scales can be applied as per GOST 2.302-68 (Table 12)
Table12
Drawing scales (GOST 2.302-68)
|
Natural scale 1:1 | ||||||||||
|
Increase |
2:1 |
2,5:1 |
4:1 |
5:1 |
10:1 |
15:1 |
20:1 |
25:1 |
– |
– |
|
Reduction |
1:2 |
1:2,5 |
1:4 |
1:5 |
1:10 |
1:15 |
1:20 |
1:25 |
1:40 |
1:50 |
5. Suggested reading
ГОСТ 2.101-68 ЕСКД. Виды изделий.
ГОСТ 2.102-68 ЕСКД. Виды и комплектность конструкторских документов.
ГОСТ 2.103-68 ЕСКД. Стадии разработки.
ГОСТ 2.108.68 ЕСКД. Спецификация.
ГОСТ 2.118-73 ЕСКД. Техническое предложение.
ГОСТ2.119-73 ЕСКД. Эскизный проект.
ГОСТ 2.120-73 ЕСКД. Технический проект.
ГОСТ 8338-75 Подшипники шариковые радиальные однорядные.
Дунаев П. Ф., Леликов О. П. Конструирование узлов и деталей машин. – М.: Высшая школа, 2003 – 447 с.
Ерохин М. Н. и др. Детали машин и основы конструирования / Под ред. М. Н. Ерохина. – М.: КолосС, 2004. – 462 с.
Иосилевич Г.Б. и др. Прикладная механика: Учебник для втузов М.: Высш. школа, 1989.
Мовнин М. С., Израелит А. Б., Рубашкин А. Г. Основы технической механики. – СПб.: Политехника, 2003. – 286 с.
Чернавский С. А. Курсовое проектирование деталей машин. М.: Высшая школа, 1988. – 416 с.
Хруничева Т. В. Детали машин: типовые расчеты на прочность: учебное пособие. – М.: ИД «ФОРУМ»: ИНФРА-М, 2007. – 224 с.
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