Development of a lesson on drawing "Keyway connection" (9th grade)
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Subject: The main parameters of the thread. Thread classification. Conditional image and thread designation in accordance with GOST 2.311-68
Correctly marked metric thread with a fine pitch in the figure ...
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Subject: Designation and image of a threaded connection in the drawing. Designation and image of standard threaded parts
The threaded connection is depicted in accordance with GOST 2.311-68 * in the figure ...
According to GOST 2.311-68 * "Image of the thread", on the cut threaded
connections in images on a plane parallel to its axis, only the part of the thread that is not covered by the thread of the rod is shown in the hole.
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Subject: Pluggable connections (except threaded)
The figure shows the connection ________ with a key.
segmented
prismatic
wedge-shaped
cylindrical
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Theme: One-piece connections
The rivet connection with countersunk head is shown in the figure ...
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Subject: Basic requirements for the design of working drawings of parts
The main view of the part in the working drawing should be selected taking into account ...
a more complete picture of the shape, size and manufacturing technology of the part
more complete understanding of the form and ease of reading the drawing convenience of setting the dimensions of all forms of the details of the sequence of manufacturing technology
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Subject: Assembly drawings. General view drawing concept
general assembly assembly
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Subject: Specification. Reading and detailing assembly drawings
A specification is a document defining ...
composition of an assembly unit, complex and kit composition of purchased products composition of standard products of an assembly unit
product operating conditions
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Subject: Detail sketch
A sketch is a drawing made ...
by hand and without exact scale
using drawing instruments with respect to scale using drawing instruments without observing scale
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Case Study: Case 1 Subtask 1
When drawing a part, various types of lines are used. The numbers 1 and 2 indicate _____ and _____ lines.
solid thick main solid thin dash dot thin solid wavy
GOST 2.303-68 “Lines” provides for nine types of drawing lines. Among them, a solid thick main (indicated by the number 1) line is designed to draw a visible outline of the part. For drawing dimensional and extension lines, a solid thin line is used (indicated by the number 2). Axial and
the center lines are depicted by the dash-dotted thin line (indicated by the number 3). To draw the cliff lines and the lines of demarcation of the type and section, a solid wavy line is used (indicated by the number 4).
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Case Study: Case 1 Subtask 2
A detail drawing is given. Determine which lines are used to execute the images, from which images it is composed and the type of lines on the surface of the geometric figure.
A detail drawing contains several images. Match the images to their names.
Section - 4 Local section - 3 Local view - 1
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Case Study: Case 1 Subtask 3
A detail drawing is given. Determine which lines are used to execute the images, from which images it is composed and the type of lines on the surface of the geometric figure.
Geometrical figures, consisting of coaxial surfaces of revolution, intersect with a plane along the arcs of an ellipse and a circle in the figures ...
The geometric figure consists of a hemisphere and a cylinder. The hemisphere is intersected by the plane Г along an arc of a circle, and the cylinder is crossed by an arc of an ellipse. The geometric figure consists of a hemisphere and a cone. The hemisphere intersects the plane Г along an arc of a circle, and the cone - along the arc of an ellipse.
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Case Study: Case 2 Subtask 1
GOST 2.302-68 "Scales" provides for the scale of the increase ...
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Case Study: Case 2 Subtask 2
A drawing of the part is presented. Choose a standard format and image scale. Determine the nature and type of images. Build points on the surface of a geometric shape.
In the drawing of the part, the numbers 3 and 4 indicate _______ and _______.
profile section left side view frontal section
view from above
The number 3 indicates a simple profile section. A cut is an image obtained by mentally dissecting an object with one or more planes. In this case, the part of the object located between the observer and the secant plane is mentally removed, and what is in the secant plane and what is behind it are depicted on the projection plane. A simple section is a section obtained by one secant plane. A sectional section is called a section if the secant plane is parallel to the profile plane of the projections.
The number 4 indicates the left view. A view is an image of the visible part of the surface of an object facing the observer. A left view is obtained by projecting an object onto the profile plane of projections. It belongs to the main species and is located in the projection connection with the main view. In this example, it is indicated by the letter B, since it is divided with the main view by a profile section.
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Case Study: Case 2 Subtask 3
A drawing of the part is presented. Choose a standard format and image scale. Determine the nature and type of images. Build points on the surface of a geometric shape.
The frontal projection of point A lying on the surface of the cone can be found using _______ and _______.
segment of a straight circle of a hyperbola
Table 4
Shaft diameter, D Dimensions of dowel section b x h Groove depth
Shaft t Sleeve t (
Over 17 to 22 6x6 3.5 2.8
Over 22 to 30 8x7 4.0 3.3
Over 30 to 38 10 x 8 5.0 3.3
Over 38 to 44 12 x 8 5.0 3.3
Over 44 to 50 14 x 9 5.5 3.8
Over 50 to 58 16 x 10 6.0 4.3
Fig. 225. Assembly drawing of keyway connection: 1 - shaft; 2 - sleeve; 3 - key
Fig. 226. Drawing for reading
For example, the shaft diameter is 18 mm. Using the table, we find the dimensions of the keys. Its width b \u003d 6 mm, height h \u003d 6 mm. The length of the keys l is chosen within the necessary limits. Take it equal to 30 mm. The groove depth on the shaft t \u003d 3.5 mm, the groove depth in the sleeve t1 \u003d 2.8 mm.
Using table 4, write down what dimensions will be the key and the grooves of the connection with the key, if the shaft diameter is 42 mm, the length of the key is 50 mm.
Figure 226 shows the connection of the lever (detail 1) to the shaft (detail 2) using a key (detail 3). Answer the questions:
1) What do the two concentric circles indicated by the number 1 (in a circle) mean?
2) What do the two horizontal lines mean between which the arrow of the digit 3 (in a circle) passes?
3) What details does the surface indicated by the number 2 (in a circle) relate to?
4) Why are the surfaces indicated by the numbers 4 and 5 (in circles) not shaded? What details do they relate to?
5) To which detail does the surface indicated by the number b (in a circle) belong?
2. Image of pin connections. Figure 209 shows pin H, which prevents the movement of parts fastened by a screw.
Fig.
Fig. 228. Visual representation of the connection pin
Drawings of pins - cylindrical and conical - are shown in Figure 227.
Figure 228 shows a visual representation, and Figure 229 shows an assembly drawing of a pin joint. The pin (detail 3, fig. 229) is located in the hole drilled simultaneously in the body (detail 1, figure 229) and in the shaft (detail 2, figure 229).
Notice that in the assembly drawings, the cross-sectional pins show, like other non-hollow parts, uncut if the secant plane passes along their axis.
The designation of the pin includes its name, dimensions and standard number, for example: The pin is cylindrical 5 x 30. This means that the cylindrical pin has the following dimensions: diameter 5 mm, length 30 mm.
Record Conical pin 10 x 70 means that the conical pin has a smaller diameter of 10 mm and a length of 70 mm.
A pin connection is sometimes used to prevent longitudinal movement of parts connected by a key (Fig. 230).
Fig. 230. Drawing for reading
Consider the drawing (Fig. 230) and answer the questions:
1) How many parts are included in the connection?
2) Why are parts 3 and 4 not shaded?
3) What are the dimensions of part 3, if it has the designation “Key 14 x 9 x 36”. Follow her drawing and technical drawing (see. Fig. 224).
Lesson in grade 9
Teacher Redkozubova A.I.
Subject: DRAWINGS
Objectives: teach students how to draw a keyed joint drawing; use reference tables correctly; expand the polytechnic horizons; to cultivate accuracy in the course of graphic activity.
Lesson Type: lesson of assimilation of knowledge, the formation of skills.
Methods of carrying out: explanation; conversation; practical work.
Equipment: keyway model; dowel model; keyway table; reference table task cards.
During the classes
I . Organizational part (1 minute).
P. The study of new material. Formation of skills, skills of building a keyed joint drawing (12 min).
The topic of today's lesson is “Keyed Drawing”. (The title of the topic is on the board.)
Question: Tell me, what are the connections for? And what types of connections are keyed? (Student opinions.)
Generalization. One of the most common detachable part connections is keyway.
Question: What parts do you think the keyed connection consists of and what is it for? (Student opinions.)
Fig. 1
Key it is designed to connect the shaft with the part planted on it: a pulley, a gear wheel, a flywheel, etc. (see Fig. 1, a). In order for the pulley to rotate together with the shaft, grooves (keyways) are cut into them, into which the key is laid (see Fig. 1, b). (Showing the keyway model.)
There are several types of dowels (see fig. 2).
In a visual representation of the connection with a key, the sleeve (see Fig. 3) is shown in section so that the key is clearly visible. On the shelves of leader lines are numbers. They correspond to the numbers that are assigned to the parts. (Showing a table of joint drawings.)
Fig. 3. Drawing parts keyway
III. Securing the studied material (14 min).
Questions and tasks for fixing:
\u003d\u003e What does a record mean Key 12 * 8 * 601
\u003d\u003e How to read a post Dowel Seg. 8 * 151
\u003d\u003e Using the table, write down what dimensions the key and connection grooves will have with the key, if the shaft diameter is 42 mm.
\u003d\u003e And now we will read the assembly drawing of the keyway according to the figure (see. Fig. 4). It shows the connection of the lever (part 1) with the shaft (part 2) using a key (part 3).
Fig. 4. Drawing for reading
Questions to the picture:
\u003d\u003e What do the two concentric circles indicated by the number 1 (in a circle) mean?
\u003d\u003e What do the two horizontal lines indicated by the number 3 (in a circle) mean?
\u003d\u003e To which detail does the surface indicated by the number 2 (in a circle) belong?
\u003d\u003e Why are the surfaces indicated by the numbers 4 and 5 (in circles) not shaded? What details do they relate to?
\u003d\u003e To which detail does the surface indicated by the number 6 (in a circle) belong?
(Student responses.)
IV. Practical work (15 minutes).
Exercises on cards to perform a keyway drawing. The task: draw a hub with a shaft connected to it using a key (see Fig. 5). The dimensions of the dowel and keyway are determined by the table. Order exercise performance:
1) distribution of task cards, reference tables;
work on the contents of the assignment;
requirements for graphic work, showing typical errors;
exercise performance;
analysis of work performed.
Each key in the assembly drawing has a symbol. For example, a record Dowel 12 * 8 * 60means that the key has the following dimensions: width 12 mm, height 8 mm, length 60 mm. Record Dowel Seg. 8 * 15read like this: segment key, thickness 8 mm, height 1 5 mm
TABLES ON BOARD .
1. Key 12 * 8 * 60 GOST 8789-68
12 - width (mm)
8 - height (mm)
60 - length (mm).
2. Dowel seg. 8 * 15 GOST 1139-58
Segment key
8 - thickness (mm)
15 - height (mm).
Since the dimensions of the keys are standardized, therefore, the shape and dimensions of the keyways (grooves) on the shaft and in the sleeve are standardized. These sizes are selected depending on the diameter of the shaft included in the joint.
Using the table in which the shaft diameter, the corresponding key dimensions (width, height) and the depth of the keyways (for the shaft and for the sleeve) are indicated, you can do the following: for example, the shaft diameter is 18 mm, we find the dimensions of the key. Its width is 6 mm, height 6 mm. We choose the length of the key within the necessary limits. Take it equal to 30 mm. The groove depth on the shaft is 3.5 mm, the groove depth in the sleeve is 2.8 mm.
Prismatic keysmm
Shaft diameter D
Key section dimensions b - h
Groove depth
Shaft t
Sleeve t 1
Over 1 7 to 22
Over 22 to 30
Over 30 to 38
10x8
Over 38 to 44
12x8
Over 44 to 50
14x9
Over 50 to 58
16x10
V . Final part(2 minutes).
Summarizing the lesson. Students submit their drawings to the teacher. The teacher points out the mistakes made by students during the execution of the keyed joint drawing, gives grades.
VI
.
Homework(1 minute).
Control 5.4 according to the textbook.
2. Image of pin connections. Figure 209 shows a pin that prevents movement of parts fastened with a screw. Drawings of pins - cylindrical and conical - are shown in Figure 228. -
Figure 229 shows the pin connection of parts. The pin is in the hole drilled at the same time in the body (detail 1) and in the shaft (detail 2). Notice that in the assembly drawings, the cross-sectional pins show, like other non-hollow parts, uncut if the secant plane passes along their axis. The designation of the pin includes its name, dimensions and standard number, for example: The pin is cylindrical5 x 30. This means that the cylindrical pin has the following dimensions: diameter 5 mm, length 30 mm.
Record Conical pin 10x70means that the conical pin has a smaller diameter of 10 mm and a length of 70 mm. A pin connection is sometimes used to prevent longitudinal movement of parts connected by a key (Fig. 230).
III. Securing the studied material.
Graphic work No. 18
Keyed drawing or shaft drawing
Make a drawing of one of the connection options with a key (see fig. 226) or a drawing of a shaft from this connection.
Directions for work No. 18. Perform the task with a pencil on a sheet of A4 format according to the example given in figure
IV. Lesson summary.
Consider the drawing (Fig. 230) and answer the questions: 1) How many details are included in
compound?
2) What are the details called 3 and 4?
3) Why details 3 and 4 not shaded ?,
4) What are the dimensions of the part? 3, if it has such a designation “Key 14X 9X 35. " five) 5)What is the purpose of the pin (det. 4)?
6) What two types of connection are shown in the drawing?
Homework:§33
Lesson number 30
General information about assembly drawings of products.
Purpose: To mentally teach, to divide the subject into separate parts;
During the classes
I. Repetition of the material.
II. Learning new material.
In the assembly drawing, the product is shown assembled with all the parts included in it.
In production, each detail is first produced according to the drawing. Then they are assembled according to the assembly drawing; into the product. Assembly drawings usually contain cuts and sections. This helps to identify the device device. As in the drawings of parts, in the lower right corner of the assembly drawing have the main inscription. It indicates the name of the product and other data related to it.
1. Specification. You have already met her in labor training classes. This is a table containing basic information about the parts included in the product. It is performed on separate sheets of A4 format. In educational drawings and in drawings of A4 format, it is placed above the main inscription.
2. Cuts in assembly drawings. The assembly drawing contains cuts. Nearby parts are shaded in opposite directions. This is done in order to facilitate reading of the drawings, making it possible to distinguish adjacent parts by hatching. Narrow sectional areas, the width of which in the drawing is 2 mm or less, show strikethrough. Bolts, screws, studs, rivets, dowels) axles, shafts, and other parts that do not have voids are shown uncut when the secant plane is directed along their axis.
3. Dimensions on assembly drawings.The dimensions of individual parts are not applied to the assembly drawing (see. Fig. 232). In such a drawing, only the dimensions necessary for the correct placement of the parts relative to each other in the product, as well as for the installation of the assembly unit, are applied. These include, for example, dimensions that determine the distance between the centers of the bolt holes that connect the two assembly units (in Fig. 232 these are sizes 38 and 56). In addition, the overall (203 ... 217, 116 and 50 in Fig. 232) and connecting dimensions are applied.
4. Reading order for assembly drawings
1. Find the name of the product.
2. To establish which images (views, sections, sections) are given in the drawing.
3. To consider, using the specification, images of each detail
4. Determine how the parts are interconnected
5. Find other data shown in the drawing (dimensions, specifications, etc.).
shortcodes "\u003e
33.1. Keyed Image. One of the most common detachable joints of parts is keyed (see Fig. 209).
The key is designed to connect the shaft with the part planted on it: a pulley, a gear wheel, a flywheel, etc.
In order for the pulley to rotate together with the shaft, grooves (keyways) are cut in them, into which the key is laid.
Fig. 222. Keyway parts
Figure 222 shows visual images of the keyed connection parts. The arrows show how they connect. In a visual representation of the connection with a key (Fig. 223), the sleeve is shown in section so that the key is clearly visible. On the shelves of leader lines are numbers. They correspond to the numbers that are assigned to the parts.
Fig. 223. Key connection
Drawings of the parts included in the connection are shown in Figure 224, and the assembly drawing in Figure 225. Notice that the key is shown uncut in the assembly drawing. As you know, this is what happens when the secant plane passes along a solid (non-hollow) part.
Fig. 224. Drawings of parts of keyed connection
In the drawing, the prismatic key connections show a small gap - the gap between the upper plane of the key and the bottom of the groove in the sleeve.
Fig. 225. Assembly drawing of keyway connection: 1 - shaft; 2 sleeve; 3 - key
Each key in the assembly drawing has a symbol. For example, the entry Key 12x8x60 means that the key has the following dimensions: width 12 mm, height 8 mm, length 60 mm. Record Dowel Seg. 8x15 read as follows: segment key, thickness 8 mm, height 15 mm. Since the dimensions of the keys are standardized, therefore, the shape and dimensions of the keyways (grooves) on the shaft and in the sleeve are standardized. These sizes are selected depending on the diameter of the shaft included in the joint.
Table 4 (extracts from GOST 23360-78) shows the shaft diameter D, the corresponding key sizes (width b, height h) and the depth of the keyways (t for the shaft, t 1 for the sleeve).
Table 4. Prismatic dowels (in mm)
For example, the shaft diameter is 18 mm. Using the table, we find the dimensions of the keys. Its width b \u003d 6 mm, height h \u003d 6 mm. The length of the keys l is chosen within the necessary limits. Take it equal to 30 mm. The groove depth on the shaft t \u003d 3.5 mm, the groove depth in the sleeve t 1 \u003d 2.8 mm.
Fig. 226. Drawing for reading
- Using table 4, write down what dimensions will be the key and the grooves of the connection with the key, if the shaft diameter is 42 mm.
- Figure 226 shows the connection of the lever (detail 1) to the shaft (detail 2) with the help of a key (detail 3). Answer the questions:
- What do the two concentric circles indicated by the number 1 (in a circle) mean?
- What do the two horizontal lines mean between which passes the arrow of the number 3 (in a circle)?
- What details does the surface indicated by number 2 (in a circle) relate to?
- Why are the surfaces indicated by the numbers 4 and 5 (in circles) not shaded? What details do they relate to?
- What part does the surface marked with the number 6 (in a circle) relate to?
33.2. Image of pin connections. Figure 209 shows pin H, which prevents the movement of parts fastened by a screw.
Drawings of the cylindrical and conical pins are shown in Figure 227.
Fig. 227. Drawings of pins
Figure 228 shows a visual representation, and figure 229 an assembly drawing of a pin joint. The pin (detail 3) is located in the hole drilled simultaneously in the housing (detail 1) and in the shaft (detail 2).
Fig. 228. Visual representation of the connection pin
Note that in the assembly drawings, the cross-sectional pins show, like other non-hollow parts, not dissected if the secant plane extends along their axis.
Fig. 229. Assembly drawing of the connection
The designation of the pin includes its name, dimensions and standard number, for example: 5x30 cylindrical pin. This means that the cylindrical pin has the following dimensions: diameter 5 mm, length 30 mm.
The entry Conical pin 10x70 means that the conical pin has a smaller diameter of 10 mm and a length of 70 mm.
A pin connection is sometimes used to prevent longitudinal movement of parts connected by a key (Fig. 230).
Fig. 230. Drawing for reading
Consider the drawing (Fig. 230) and answer the questions:
- How many parts are included in the connection?
- Why are parts 3 and 4 not shaded?
- What are the dimensions of part 3, if it has such a designation “Key 14x9x35”. Follow her drawing and technical drawing (see. Fig. 224).