(ebook pdf) engr - CAD_Engineering design with Solid Works

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2024-12-06 0 0 2.5MB 63 页 5.9玖币
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Engineering Design with
SolidWorks 2001Plus
A Competency Project Based Approach
Utilizing 3D Solid Modeling
David C. Planchard & Marie P. Planchard
PUBLICATIONS
SDC
Schroff Development Corporation
www.schroff.com
www.schroff-europe.com
Engineering Design with SolidWorks Extrude and Revolve Features
PAGE 4 - 1
Project 4
Extrude and Revolve Features
Below are the desired outcomes and usage competencies based upon the
completion of Project 4.
Project Desired Outcomes: Usage Competencies:
A comprehensive understanding of
the customer’s design requirements
and desires.
To comprehend the fundamental
definitions and process of
Feature-Based 3D Solid Modeling.
A product design that is cost
effective, serviceable and flexible for
future manufacturing revisions.
Four key flashlight components:
• BATTERY
• BATTERY PLATE
• LENS
• BULB
Specific knowledge and
understanding of the Extrude and
Revolve features.
Extrude and Revolve Features Engineering Design with SolidWorks
PAGE 4 - 2
NOTES:
Engineering Design with SolidWorks Extrude and Revolve Features
PAGE 4 - 3
Project 4 – Extrude and Revolve Features
Project Objective
Create four components of the flashlight. Create the BATTERY, BATTERY
PLATE, LENS and BULB components.
Project Situation
You are employed by a company that specializes in providing promotional trade
show products. Your company is expecting a sales order for 100,000 flashlights
with a potential for 500,000 units next year. Prototype drawings of the flashlight
are required in three weeks.
You are the design engineer responsible for the project. You contact the customer
to discuss design options and product specifications. The customer informs you
that the flashlights will be used in an international marketing promotional
campaign. Key customer
requirements:
• Inexpensive reliable flashlight.
• Available advertising space of
10 square inches, 64.5 square
centimeters.
• Light weight semi
indestructible body.
• Self standing with a handle.
Your company’s standard product
line does not address the above key
customer requirements. The customer made it clear that there is no room for
negotiation on the key product requirements.
You contact the salesperson and obtain additional information on the customer and
product. This is a very valuable customer with a long history of last minute
product changes. The job has high visibility with great future potential.
In a design review meeting, you present a conceptional sketch. Your colleagues
review the sketch. The team’s consensus is to proceed with the conceptual design,
Figure 4.1.
The first key design decision is the battery. The battery type will directly affect
the flashlight body size, bulb intensity, case structure integrity, weight,
manufacturing complexity and cost.
Figure 4.1
Extrude and Revolve Features Engineering Design with SolidWorks
PAGE 4 - 4
You review two potential battery options:
• A single 6-volt lantern battery.
• Four 1.5 volt D cell batteries.
The two options affect the product design and specification. Think about it.
A single 6-volt lantern battery is approximately 25% higher in cost and 35% more
in weight. The 6-volt lantern battery does provide higher current capabilities and
longer battery life.
A special battery holder is required to incorporate the four 1.5 volt D cell
configuration. This would directly add to the cost and design time of the
flashlight, Figure 4.2.
Time is critical. For the prototype, you decide to use a standard 6-volt lantern
battery. This eliminates the requirement to design and procure a special battery
holder. However, you envision the 4-D cell battery model for the next product
revision. You design the flashlight to accommodate both battery design options.
Figure 4.2
Engineering Design with SolidWorks Extrude and Revolve Features
PAGE 4 - 5
Battery dimensional information is required for the design. Where do you go?
Potential sources: product catalogs, company web sites, professional standards
organizations, design handbooks and colleagues.
The team decides to purchase the following components: 6-volt BATTERY,
LENS ASSEMBLY, SWITCH and an O-RING. Your company will design and
manufacture the following components: BATTERY PLATE, LENSCAP,
HOUSING and SWITCH PLATE.
Purchased Parts Designed Parts
BATTERY BATTERY PLATE
LENS ASSEMBLY LENS CAP
SWITCH HOUSING
O-RING SWITCH PLATE
Project Overview
Create four parts in this section, Figure 4.3a:
• BATTERY
• BATTERY PLATE
• LENS
• BULB
Extruded-Base
feature
BATTERY
PLATE
BATTERY
Revolve
Base feature
LENS
BULB
Figure 4.3a
Extrude and Revolve Features Engineering Design with SolidWorks
PAGE 4 - 6
Two major Base features are discussed in this project:
• Extrude – BATTERY and BATTERY PLATE.
• Revolve – LENS and BULB.
Note: Dimensions and features are used to illustrate the SolidWorks functionality
in a design situation. Wall thickness and thread size have been increased for
improved picture illustration. Parts have been simplified.
You will create four additional parts in
Project 5 for a final flashlight assembly,
Figure 4.3b.
• O-RING
• LENSCAP
• SWITCH
• HOUSING
BATTERY
The BATTERY is a simplified representation of an OEM component. The
BATTERY consists of the following features:
• Extruded Base
• Extruded Cut
• Edge Fillets
• Face Fillets
The battery terminals are represented as cylindrical extrusions. The battery
dimension is obtained from the ANSI standard 908D.
Note: A 6-volt lantern battery weighs approximately 1.38 pounds, (0.62kg).
Locate the center of gravity closest to the center of the battery.
Figure 4.3b
Engineering Design with SolidWorks Extrude and Revolve Features
PAGE 4 - 7
BATTERY Feature Overview
Create the BATTERY, Figure 4.4a. Identify the
required BATTERY features.
• Extruded Base: The Extruded Base feature is
created from a symmetrical square sketch,
Figure 4.4b.
• Fillet: The Fillet feature is created by selecting the
vertical edges and the top face, Figure 4.4c and
Figure 4.4e.
• Extruded Cut: The Extruded Cut feature is created
from the top face offset, Figure 4.4d.
• Extruded Boss: The Extruded Boss feature is created to represent the battery
terminals, Figure 4.4f.
Let’s create the BATTERY.
Figure 4.4a
Figure 4.4d Figure 4.4e Figure 4.4f
Figure 4.4b Figure 4.4c
Extrude and Revolve Features Engineering Design with SolidWorks
PAGE 4 - 8
Create the Template
Dimensions for the FLASHLIGHT ASSEMBLY are provided both in English
and Metric units. The Primary units are in inches. Three decimal places are
displayed to the right of the decimal point. The Secondary units are in millimeters.
Secondary units are displayed in brackets [x]. Two decimal places are displayed
to the right of the decimal point. The PARTENGLISH TEMPLATE contains
System Options and Document Properties settings for the parts contained in the
FLASHLIGHT ASSEMBLY. Substitute the PARTMETRIC TEMPLATE to
create the same parts in millimeters.
Create an English document template.
1) Click New . Click the Part template. Click OK. The
Front, Top and Right reference planes are displayed in the Part1
Feature Manager.
Set System Options.
2) Click Tools, Options, from the Main menu. The
System Options - General dialog box is displayed.
Insure that the check box Input dimension value and
Show errors every rebuild in the General box are
checked. These are the default settings.
Set the Length increment.
3) Click the Spin Box Increments option. Click
the English units text box. Enter .100. Click
the Metric units text box. Enter 2.5.
Set the Dimension Standard to ANSI.
4) Click the Document
Properties tab. Select ANSI
from the Dimensioning
standard drop down list.
Set the Document Properties.
5) Click the Units option. Enter
inches, [millimeters] from the
Linear units list box. Click the
Decimal button. Enter 3, [2] in the
Decimal places spin box.
Engineering Design with SolidWorks Extrude and Revolve Features
PAGE 4 - 9
Save the Settings and Template.
6) Click OK from the Document Properties dialog box.
7) Click File from the Main
menu. Click Save As.
Click *.prtdot from the
Save As type list box. The
default Templates file
folder is displayed. Enter PARTENGLISH TEMPLATE, [PARTMETRIC TEMPLATE]
in the File name text box. Click Save.
ASMEY14.5M defines the types
of decimal dimension display for
inches and millimeters. The
Primary units are in inches. Three
decimal places are displayed to the
right of the decimal point. The
Secondary units are in millimeters.
Secondary units are displayed in
brackets [x]. Two decimal places
are displayed to the right of the
decimal point.
The precision is set to 3 decimal places for inches. Example: 2.700 is displayed. If you
enter 2.7, the value 2.700 is displayed. The precision is set to 2 decimal places for
millimeters. Example: [68.58] is displayed. For consistency, the inch part dimension
values for the text include the number of decimal places required. The drawings
utilizes the decimal dimension display as follows:
TYPES of DECIMAL DIMENSIONS (ASME Y14.5M)
Description Example
MM
Description Example
INCH
Dimension is less than 1mm.
Zero precedes the decimal
point.
0.9
0.95
Dimension is less than 1
inch.
Zero is not used before
the decimal point.
.5
.56
Dimension is a whole number.
No decimal point.
Display no zero after decimal
point.
19
Dimension exceeds a whole
number by a decimal fraction of
a millimeter.
Display no zero to the right of
the decimal.
11.5
11.51
Express dimension to
the same number of
decimal places as its
tolerance.
Add zeros to the right of
the decimal point.
If the tolerance is
expressed to 3 places,
the dimension contains 3
places to the right of the
decimal point.
1.750
摘要：

              ...

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