Presentation Projecto Maquinas 1
Transcript of Presentation Projecto Maquinas 1
-
7/27/2019 Presentation Projecto Maquinas 1
1/28
Machine Component Design Project
-
7/27/2019 Presentation Projecto Maquinas 1
2/28
Agenda
Overview
Design Objectives
Process Flowchart
Data Analysis
Material Selection
Design Proposal
-
7/27/2019 Presentation Projecto Maquinas 1
3/28
Overview
Our design labor consist in the design process of a V-belt speed
reduction shaft for a given mechanism with fixed forces andtorque. The model consist of two rotating pulleys with different
diameters connected to a shaft linkage.
-
7/27/2019 Presentation Projecto Maquinas 1
4/28
Shaft Design
Defining Problem
Design objectives
Static Analysis
Defining forces
and reaction Shear and
momentumdiagrams
Critical Point
Stress analysis
Safety factor
selection Material Selection
Informationresearch
Solve for optimalDiameter
DesignProposal
-
7/27/2019 Presentation Projecto Maquinas 1
5/28
Design Objectives
Construct a shaft with a safety diameter
that can handle the forces created by
the rotating belt tension
Choose a material that is both reliableand economic viable
Build a design that can be easily
manufacturedAccomplish with all the standards of
good engineering practice
-
7/27/2019 Presentation Projecto Maquinas 1
6/28
Static Analysis
The forces in the space are divided in to
two different plane components, plane
XY, and plane XZ
The analysis will be consider at thesurface point in the shaft critical point.
Gravitational forces are neglected
-
7/27/2019 Presentation Projecto Maquinas 1
7/28
Static Analysis
Pulley B
Pulley D
-
7/27/2019 Presentation Projecto Maquinas 1
8/28
Static Analysis
Point C
Point A
-
7/27/2019 Presentation Projecto Maquinas 1
9/28
Static Analysis
Forces in Plane XZ
Forces in Plane YZ
2552.18 N 2262.36 N
371.147 N 4443.367 N
3580.43 N 374.31 N
1640.49 N 2314.259 N
-
7/27/2019 Presentation Projecto Maquinas 1
10/28
Static Analysis
Shear through the shaft in the plane XZ
Shear through the shaft in the plane YZ
-
7/27/2019 Presentation Projecto Maquinas 1
11/28
Static Analysis
Momentum through the shaft in the plane XZ
Momentum through the shaft in the plane YZ
-
7/27/2019 Presentation Projecto Maquinas 1
12/28
Static Analysis
0
20
40
60
80
100
120
140
160
0 50 100 150 200 250
Axis Title
Momentum
Critical Point136.59 N-m
-
7/27/2019 Presentation Projecto Maquinas 1
13/28
Static Analysis
-300
-250
-200
-150
-100
-50
0
0 50 100 150 200 250
Torque(N-m
)
Shaft Length (m)
254.5 N-m
-
7/27/2019 Presentation Projecto Maquinas 1
14/28
Data Analysis
We selected a Safety factor of 2.5
because it is a dynamic system that will
be under cyclic stresses.
We assumed the step on the shaftbetween pulley b and bearing C to have
a diameter of 40 mm.
-
7/27/2019 Presentation Projecto Maquinas 1
15/28
point B stress Analysis: d1
Sigma Bending
Shear Stress
-
7/27/2019 Presentation Projecto Maquinas 1
16/28
point C stress Analysis: d2
Sigma Bending
Shear Stress
-
7/27/2019 Presentation Projecto Maquinas 1
17/28
Material Selection
The material selection process is reduce
and analysis is reduced to steel
materials. This due the reliability and
value of this well known and very oftenused material. Ceramics, polymers,
composites and other metals where
unconsidered because the superiority of
steel alloys, the availability and value in
the industry
-
7/27/2019 Presentation Projecto Maquinas 1
18/28
Material Selection
Three specific Steel alloy are considered :
: Low carbon steel use in many application
because ins malleable, ductile and cheap, but it cannot be heat
treated.
: Medium carbon have a good balance
between yield strength and ductility.
: High carbon steel have a high hardness and
yield point but it have a low ductility.
-
7/27/2019 Presentation Projecto Maquinas 1
19/28
Material Selection
Property High Carbon Steel 1055 Low carbon Steel 1010 Medium Carbon Steel 1045
Elastic modulus (Gpa) 190 190 190
Poison Ratio 0.3 0.3 0.3
Yiel Strenght (Mpa) 560 305 505
Elongation to fracture 10% 20% 12%
Hardness @ T=25 197 105 170
Properties of the considered materials
-
7/27/2019 Presentation Projecto Maquinas 1
20/28
Diameter Calculation
Using the MSS theory:
Using the DET theory:
-
7/27/2019 Presentation Projecto Maquinas 1
21/28
Diameter calculations
Point C :
-
7/27/2019 Presentation Projecto Maquinas 1
22/28
Diameter calculations
Point B :
Value found by Iteration In Excel
-
7/27/2019 Presentation Projecto Maquinas 1
23/28
Stress Concentration
-
7/27/2019 Presentation Projecto Maquinas 1
24/28
Diameter - Stress
Concentration
-
7/27/2019 Presentation Projecto Maquinas 1
25/28
Slope and deflection
Slope in Plane XZ
Deflection Plane XZ
-
7/27/2019 Presentation Projecto Maquinas 1
26/28
Slope and deflection
Slope in Plane YZ
Deflection Plane YZ
-
7/27/2019 Presentation Projecto Maquinas 1
27/28
Questions ?
-
7/27/2019 Presentation Projecto Maquinas 1
28/28
Resources
MD Solids 3.5 software. www.mdsolids.com
http://www.efunda.com/materials/alloys/carbon_steels/list_ca
rbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_1
0
http://www.efunda.com/materials/alloys/alloy_home/steels.cf
m
http://www.metalsupplies.com/mild-steel-rounds.html
http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10