Chap.10 Scheme of Mechanism system
Chap.10.1 Review Design Process
Chap.10.2 Design Process of Kinematic Scheme of
the Mechanism System
Chap.10.1 Design Process
Problem Definition
Concept Generation
Concept Selection
Embodiment Design
Detail Design
Fabrication
Evaluation
Ite
ratio
n
Why?
What?
Which?
How?
Chap.10.2 Design process of kinematic
scheme of the mechanism system
? Process
? Example
Design process
Redesign
working principle of the machine
Type synthesis of the mechanisms
Dimensional synthesis of mechanisms
Evaluation
Motion forms analysis
Cooperation design
Kinematic diagram of the mechanisms
Working Principle of the Machine Step1
? Gear cutting,form cutting and generating cutting
? Sheet transmission machine,
Creation & conclusion
Motion forms analysis Step2
? Analyze and decompose the
motion which machine needs,
think out the motion forms,
? Method,imitation,creation
Creation & conclusion
Type synthesis of the mechanisms Step3
? Choose,combine into or create the
mechanisms
? Principle,
satisfy the requirements,choose
mechanisms as simple as it can be,limit
the size,choose suitable kinematic pairs,
consider the drivers,good dynamic
characteristics,be adjustable,be safe
Cooperation design step4
Cooperation of the function,time and space,
To ensure the cooperation of working links,
the working cycle diagram is drawn,It is a
time table for the actions of all the working
links,
1.Principle
2.Method
3.Working cycle diagram
Principle
1,Operation Order(sequence of
actions)
2,Step and cycle
3,Layout and no interference
4,Efficiency and less energy,
Method
1.Working cycle
2.Working time of the each
mechanism
3.Motion cooperation
4,Filling Lotion
1,Transmission
2,Rotation and
intermittent
3,Translation up
and down
Rectilinear working cycle diagram
Circular working cycle diagram
Rectangular coordinate working
cycle diagram
Working cycle diagram
Evaluation Step6
Indexes of evaluation
1) System function
2) Working performance
3) Dynamic performance
4) Economic performance
5) Structure,size,weight,complexity
6) Layout
Example-Shaping machine
Redesign
working principle of the machine
Type synthesis of the mechanisms
Dimensional synthesis of mechanisms
Evaluation
Motion forms analysis
Cooperation design
Kinematic diagram of the mechanisms
Working principle of the machine
Cutting plains
? Mill (铣 )
? Plane (刨 )
? Grind (磨 )
Motion forms analysis
Two main motions and requirement,
1) Cutting cycle
2) Feeding cycle
3) Adjustment of the system
? Relative reciprocating motion between the cutter
and the workpiece,The stroke should be
adjustable.the velocity of the motion should be
uniform,
? The feeding motion in the direction
perpendicular to cutting motion,The feeding
motion should be adjustable
Type synthesis of the mechanisms
? Cutting motion
? Feeding motion
? Selection of mechanisms for cutting
Selecting feeding mechanisms
Cooperation design
Dimensional synthesis of mechanisms
? Use the methods we taiked in the above chapters
Evaluation
Principles
1) System function
2) Working performance
3) Dynamic performance
4) Economic performance
5) Structure,size,weight,complexity
6) Layout
Kinematic diagram of the mechanisms
Homework
? 某自动机采用一个电机驱动，经过减速后驱动输送带、转盘间歇分度机构、冲
头 2和卸料杆 1完成对毛坯 3的输送、定位、加工和卸料等工艺动作，理论生产
率为 20个 /分，其工艺动作为,
? 1）由输送带和转盘间歇分度机构将毛坯 3送到平台 4上，冲头 2开始下行；
? 2）经过 0.8秒后冲头 2接触毛坯 3，又经过 0.2秒后，冲头 2将毛坯 3压缩到指
定的尺寸，停歇 0.4秒后，冲头 2开始快速返回，至原始位置，等待下一个循环；
? 3）在冲头 2开始返回的同时，卸料杆 1亦开始动作，经过 0.8秒后将毛坯送到
指定位置，然后用 0.5秒退回到原停歇位置，等待下一个循环。
? 请完成以下设计任务,
? 1）绘制该自动机的运动循环图
? 2）设计冲压机构（含冲头 2），绘制其机构运动示意图，提出至少两种方案；
? 3）设计卸料机构（含卸料杆 1），绘制其机构运动简图，提出至少两种方案；
4
3
2
1
Chap.10.1 Review Design Process
Chap.10.2 Design Process of Kinematic Scheme of
the Mechanism System
Chap.10.1 Design Process
Problem Definition
Concept Generation
Concept Selection
Embodiment Design
Detail Design
Fabrication
Evaluation
Ite
ratio
n
Why?
What?
Which?
How?
Chap.10.2 Design process of kinematic
scheme of the mechanism system
? Process
? Example
Design process
Redesign
working principle of the machine
Type synthesis of the mechanisms
Dimensional synthesis of mechanisms
Evaluation
Motion forms analysis
Cooperation design
Kinematic diagram of the mechanisms
Working Principle of the Machine Step1
? Gear cutting,form cutting and generating cutting
? Sheet transmission machine,
Creation & conclusion
Motion forms analysis Step2
? Analyze and decompose the
motion which machine needs,
think out the motion forms,
? Method,imitation,creation
Creation & conclusion
Type synthesis of the mechanisms Step3
? Choose,combine into or create the
mechanisms
? Principle,
satisfy the requirements,choose
mechanisms as simple as it can be,limit
the size,choose suitable kinematic pairs,
consider the drivers,good dynamic
characteristics,be adjustable,be safe
Cooperation design step4
Cooperation of the function,time and space,
To ensure the cooperation of working links,
the working cycle diagram is drawn,It is a
time table for the actions of all the working
links,
1.Principle
2.Method
3.Working cycle diagram
Principle
1,Operation Order(sequence of
actions)
2,Step and cycle
3,Layout and no interference
4,Efficiency and less energy,
Method
1.Working cycle
2.Working time of the each
mechanism
3.Motion cooperation
4,Filling Lotion
1,Transmission
2,Rotation and
intermittent
3,Translation up
and down
Rectilinear working cycle diagram
Circular working cycle diagram
Rectangular coordinate working
cycle diagram
Working cycle diagram
Evaluation Step6
Indexes of evaluation
1) System function
2) Working performance
3) Dynamic performance
4) Economic performance
5) Structure,size,weight,complexity
6) Layout
Example-Shaping machine
Redesign
working principle of the machine
Type synthesis of the mechanisms
Dimensional synthesis of mechanisms
Evaluation
Motion forms analysis
Cooperation design
Kinematic diagram of the mechanisms
Working principle of the machine
Cutting plains
? Mill (铣 )
? Plane (刨 )
? Grind (磨 )
Motion forms analysis
Two main motions and requirement,
1) Cutting cycle
2) Feeding cycle
3) Adjustment of the system
? Relative reciprocating motion between the cutter
and the workpiece,The stroke should be
adjustable.the velocity of the motion should be
uniform,
? The feeding motion in the direction
perpendicular to cutting motion,The feeding
motion should be adjustable
Type synthesis of the mechanisms
? Cutting motion
? Feeding motion
? Selection of mechanisms for cutting
Selecting feeding mechanisms
Cooperation design
Dimensional synthesis of mechanisms
? Use the methods we taiked in the above chapters
Evaluation
Principles
1) System function
2) Working performance
3) Dynamic performance
4) Economic performance
5) Structure,size,weight,complexity
6) Layout
Kinematic diagram of the mechanisms
Homework
? 某自动机采用一个电机驱动，经过减速后驱动输送带、转盘间歇分度机构、冲
头 2和卸料杆 1完成对毛坯 3的输送、定位、加工和卸料等工艺动作，理论生产
率为 20个 /分，其工艺动作为,
? 1）由输送带和转盘间歇分度机构将毛坯 3送到平台 4上，冲头 2开始下行；
? 2）经过 0.8秒后冲头 2接触毛坯 3，又经过 0.2秒后，冲头 2将毛坯 3压缩到指
定的尺寸，停歇 0.4秒后，冲头 2开始快速返回，至原始位置，等待下一个循环；
? 3）在冲头 2开始返回的同时，卸料杆 1亦开始动作，经过 0.8秒后将毛坯送到
指定位置，然后用 0.5秒退回到原停歇位置，等待下一个循环。
? 请完成以下设计任务,
? 1）绘制该自动机的运动循环图
? 2）设计冲压机构（含冲头 2），绘制其机构运动示意图，提出至少两种方案；
? 3）设计卸料机构（含卸料杆 1），绘制其机构运动简图，提出至少两种方案；
4
3
2
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