Conference Paper · January 2017 with 4 Reads
DOI: 10.2991/jimec-17.2017.136
Conference: 2017 2nd Joint International Information Technology, Mechanical and Electronic Engineering Conference (JIMEC 2017)
From:Joint International Information Technology, Mechanical & Electronic Engineering Conference2017/9/4
A review of the new theory of filling structure mechanical design
Abstract :
Based on reviewing the historical background, prospecting for the development trend ,analyzing the complicacy and mechanism and summing up some achievements and experiences in scientific research , several new problems and the possible direction of development in material processing technology and machine are proposed ,such as ,producing new concept materials possessing some specific and extraovdinary properties by means of integrating and coalescing conelative frontier science and technology ;and thereafter a brief discussion is given.
Keywords: interface; extraordinary physical field; procession machine ; function material
1 The Time Background of Material Processing Machine
In the long span of history of human progress ,many tools ,machines and methods were created and a variety of materials with different properties were processed. Materials and its processing have become one of pillar and driving force of mankind progress. In pace with multi - polar competition in current world and people’s striving perseveringly for happier life ,material function goes beyond unceasingly men’s knowledge and imagination ,for example ,cryptic function material ,semiconductor material ,energy material ,vibration - absorptive material , super - strength aluminum alloy accounting for 70 percent of application of aeronautics and space ,metal foil of 4～5μm ,deep drawing plate with anisotropy below 1 percent ,electronic aluminum foil with micro - orientation up to 95 percent ,heat resisting aluminum alloy with super strong specific strength used in aeronautics ,space and deep sea ,etc. Thus several important development trends with distinct time features in material processing domain are shaped up as follows :
(1) Creating material processing machine with extraordinary physical field for processing material with special texture structures and functions. For example ,applications of thermal energy and mechanical energy are breaking through unceasingly technology limit ,and some non - tradition energy ,such as microwave ,chemical energy , bioenergy , etc. , are introduced into material processing procedure one after another ,so that some material processing machines with extraordinary energy circumstance are produced.
(2) Breaking through traditional physical limits and integrating melting ,solidifying ,plastic deformation and heat treatment to obtain special function of material and cut down expenses[3 ] . For example ,near - net shaping material processing technology , such as fast rolling , spraying deposition ,over - plastic molding , injection molding , high energy beam ,etc ,is applied.
(3) Material processing process is forged ahead in the direction of high speed ,heavy - duty and high accuracy online control ,for instance , the rolling speed goes up to 130 m·s - 1 ,the deformation pressure rises up to 300 MPa ,accuracy of dimension up to 0.1μm ,accuracy of shape up to 0. 1 I ,strength accuracy comes up to 0.1 MPa. For these reasons ,it is necessary for material processing machine design theory to integrate and coalesce ingeniously correlative frontier science and technology to create and produce some new concept material processing machine with following functions.
2 Due Functions of New Concept Material Processing Machine
(1) To have the ability to produce and bear extraordinary physical field and transmit extraordinary energy flow with the aim of providing extraordinary physical circumstances necessary for new concept material processing. For example ,high gradient temperature field with the speed of cool - down of work interface which exceeds 104～106 K·s - 1 , line wave and pulse complex exerted in solidifying - deforming area , super - strength contact stress field of material forming interface ,turbulent flow field of molten metal with very big flakiness ratio ,low frequency magnetic field with random frequency ,microwave field for powder metal heating ,ultrasonic field for large volume solidifying ,etc. [4 ] ,are applied.
(2) To have the ability to work in critical state so that high stability and ideal performance of processing machine is ensured under the circumstance of reinforced technological condition and multi - field coupling operation. For example ,chatter suppressing capability of fast ultra - thin rolling under the condition of boundary lubricating state[5 ] ,the capability of self - excited vibration suppressing under the condition of special friction state ,synergism stability and disturbance stability of flexible connecting parallel shaft with multi - driving system ,etc. [4 ] ,are ensured.
(3) To have the ability to accurately control the material processing in order to obtain low loss ,high efficiency and high quality of material processing. For example , super - high accuracy on - line monitor of products form ,on – line monitor and on - line adjustment of products texture and properties ,precision coordination control of multi - procedure , on - line monitor of micro - orientation of metal plastic deformation ,etc. [4 ] ,are ensured. Some products accuracy index may be enumerated as follows : dimensional accuracy coming to 0.1μm , microstructure uniformity to crystal lattice ,strength error to 0.1 MPa ,etc. [4 ] In short ,only by new concept material processing machine with extraordinary function being designed and made , can special function material be processed.
3 Science Problems and Study Contents of Metal Material Processing Machine
Under the Circumstance of Extraordinary Physical Field
In view of these facts and background mentioned above ,several new research topics can be advanced as follows.
3. 1 Coupling Heat Transfer Mechanism of Multi - Phase Interface Temperature - Stress Field
A brand - new microstructure can be obtained through continuously large deformation and fast solidifying when melting metal is in critical state of liquid solid. At this very moment ,high density heat flow and dynamic heat resistance are present in material processing circumstance . A basic theory problem of designing this kind of machine is to study mechanism of heat transmittance and energy conversion ,and to establish mathematical model .
3. 2 Friction Constraint Mechanism of Plastic Flow Interface of Material Processing Machine
The coupling between operation mechanism and workpiece is very complicated because plastic flow is present in processing interface. The interface state , determined by velocity , load thermodynamic process , elasticity of operation mechanism ,plasticity of workpiece ,dynamic behaviour of interface sticking - sliding and partial hydrodynamic lubrication ,etc ,affect and form friction constraints mechanism peculiar to material processing machine ,because these constraints present strong non - linearity ;and under certain circumstances ,the constraints may be destroyed or mismatched instantaneously and thus dynamic instability is resulted in. Thus following problems can be put forward : Mechanism of“spectre chatter”arose from sticking - sliding friction and partial hydrodynamic lubrication in rolling interface , instability condition and mechanism of constraint between smooth surface and rotating body under the circumstance of high speed ,heavy - duty and boundary lubrication , Lubrication film absorption mechanism and physical chemistry behaviour of interface of unceasingly regenerative surface ,the relationship between rheological characteristic and machine operation parameters.
3. 3 Multi - Body Non - Linear Contact Mechanism Under the Condition of Extra - High Pressure Field
To build the super strength pressure field on large area is one of basic function of material processing machine , and it is also necessary to form by once large - size structure element (such as spacecraft , intercontinental vehicles ,car and large - scale aeroplane etc) . The ability to build super strong pressure field is one of important feature and the base of independent national defense. Under the circumstance of super strength pressure field ,multi - body strong nonhertz contact and non - linear friction will be produced ,thus local permanent deformation and degrading of element accuracy may be led. New theory foundation of design of machine with super strength pressure field will be furnished through study of multi - body strong non - hertz contact mechanism , multi - body non - linear friction mechanism (such as providing force - displacement mixed solving process of three - dimension multi - body) .
3. 4 Load Distribution Law in Multi - Sliding Pair With Structure Bias Load
With regard to statically indeterminate structure ,load distribution of constraint point is determined by deformation compatibility condition. However ,concerning some plane large - size statically indeterminate structure with sliding degree of freedom in third dimension ,load distribution can not be determined by deformation compatibility condition. Thus new theory basis will be provided by analyzing of contact behaviour and mechanism of sliding pair (such as creep ,force of friction ,integral deformation compatibility condition ,etc) .
3. 5 Coupling Mechanism and Stability of Multi - Physical Fields in Material Processing Systems
In the wake of system function becoming more and more diversified , conventional technology limits in material processing machine is being broke through unceasingly ,system structure also becomes increasingly complicated ,and system performance becomes increasingly multi - causal . For example ,any instantaneous state of roller in fast rolling mills is affected by elastic deformation ,plastic flow ,heat transfer process , hydro - dynamic lubrication process ,interface physical chemistry molecular state and so on . In addition ,electromechanical coupling in processing system have already gone beyond conventional concept ,for instance ,some singular point phenomenon (such as micro - variable can be transformed into macro - variable) ,are present ,thus roller operation instability may be led by perturbation[8 ] . Therefore ,this subject will study the interaction mechanism of multi - physical field and the influence on processing system stability and processing material quality started with analysis of micro - state of executive body.
3. 6 Multi - Technology Integration and Coalescence of Accurate Control
The material processing machine ,which operate under the circumstance of extraordinary physical field ,is a complicated large - scale system ,and some parameters of the system vary on feasible field boundary ;thereby ,to keep under accurate control and adjustment of multi field circumstance ,multi - dimension coordination ,multi - energy conversion , multi - level information transfer ,interface multi - process coupling ,etc. is of much significance. Since a variety of multi - interaction exists in control model ,it is necessary to establish integration framework of coordination work according to decoupling of control model ,so as to accurate control based on the multi - technology integration and coalescence is realized.
3. 7 Quasi - Reality Design and Concurrent Design Based on Knowledge Innovation Systems
Digitalization and visualization of material processing technology will promote immediately the quality of design, operation and control . Therefore optimization of material processing technology and material processing machine by means of realization of virtual simulation of processing procedure through quasi - reality design and concurrent design is one of our pressing study subjects.
3. 8 Mechanical Behavior of Special Function Materials in the Extraordinary Physical Field
Many key elements and parts in material processing machine are often under the circumstance of super strong force field ,temperature field ,electronic magnetic field and flow field ,and must have the functions of constructing special physical interface. However ,it is difficult for common single - substance material such as metal ,ceramic polymer ,etc. to have both high index of single property and excellent overall quality. Therefore we need to use certain material with new functions for key position[9 ] ,for instance ,multi - dimension function gradient material with ultrahigh physical property ,multi - dimension function gradient material with intelligence. For these reasons ,it is necessary to study basic law and mechanism of these kind of function material mentioned above ,for instance ,stress (strain) distribution function ,failure mechanism and design criteria of material under the circumstance of extraordinary physical field ,static (dynamic) stiffness and damping ,digitalization design and visualization design of processing system made of gradient function material ,etc ,so that the general mechanics law of element which is under the circumstance of extraordinary physical field and made of anisotropy multi - dimension gradient function material is obtained. Nowadays ,material processing science and technology is forging rapidly ahead. A forward - looking study aiming at key technology problem of material processing machine will provide theory and technology reserve for manufacturing science and industry of 21st century.
Nowadays, filling machinery, especially beverage, beer filling machine and food packaging machinery, have the characteristics of high speed, complete sets, high automation and good reliability, and are also the trend of development of filling machinery industry at present.
(I) Multifunction
The same equipment can be used for hot filling of many kinds of drinks, such as tea, coffee, soybean milk and fruit juice, and can be filled with glass bottle and polyester bottle. The filling speed of high yield carbonated beverage filling machine is up to 2000 cans / min. The filling valves of German KHS Company, SEN Company and KRONES Company are 165,144,178 respectively. Non-carbonated beverage filling machine filling valve 50-100, filling speed up to 1500 cans / min.
(2) High technical content and high reliability.
The automatic control level of the whole line and the efficiency of the whole line are high. The on-line measuring device and metering device are complete, can automatically detect all parameters and measure accurately. Set machine, electricity, gas, light, magnetic as one of the high-tech products continue to emerge.
(III) strong supply packages
For example, a beverage filling line is composed of microcomputer parts, control software, filling and sealing cover, and the combination of practical productivity and theory and technology. Suppliers can provide users with engineering design, installation, commissioning, and final acceptance. For example, in Shenyang Dongtai packaging machinery design, the general use of simulation design technology will be used to store various machine units in the form of a database, and the drawings will be digitized and input into the computer, and then the actual production indicators and data will be put into the computer. The possible failures are input into the computer and then operated by the engineer according to the actual working conditions, demonstrating the production capacity, the waste rate, the matching of the production links, and the bottleneck of the production line Where and so on, may also according to the user opinion to carry on the modification model until the user is satisfied.
At present, filling machine technology is widely used in the development, design and manufacture of food and beverage packaging. At present, the development trend of filling machinery is to continuously improve the degree of automation of single machine, improve the automation control level of the whole packaging production line, and improve the production capacity, which can greatly improve the quality of food and beverage packaging production equipment products and improve its domestic production. International competitiveness
With the rapid development of China's wine industry, the output of beer, wine, yellow rice wine, liquor and so on continues to increase, and the total output of beverage wine (excluding fruit wine, fermented alcohol) has reached 2878 thousand liters, up 8.2 percent from the same period last year. Experts pointed out that the beverage industry in China is a high growth industry, mature drinks growth is stable, new hot spots and growth points continue to emerge, the growth of new drinks faster. At the same time, China's packaging machinery has developed into a world liquid food industry has a major impact and a great market share of the industry. Therefore, liquid filling machine market development potential is huge.
In order to meet the needs of the rapid development of packaging industry and participate in international competition actively, the liquid filling machine in our country must break the situation of "small and scattered" industry and keep advancing in the direction of "high precision". Industry insiders believe that the future liquid filling machine will be in line with the trend of industrial automation, in the development of technology towards the mechanical function diversification, structural design standardization, modular, intelligent control, high-precision structure and other directions to develop liquid. Therefore, the development of filling machine provides the necessary guarantee for the modern processing and mass production of food and medicine. Thus proved once again the development market potential of liquid filling machine is huge.
4 Design experience
Graduation design is we learned in the university of technology and the basic courses, all course all professional class after the. This is we have all of the course of the first in-depth comprehensive review of the total, is also our into social work in front of a theory with the practice of training. Therefore, it is in our four year university life holds an important position. Personally, I hope I can pass the graduation design for your future will be engaged in the work of a light training, to exercise his analysis problem, problem-solving ability, for the future of our motherland in the four construction lay a good foundation.
Turn an eye for four weeks of mechanical manufacturing technology and special jig design will be over, the design of curriculum review around the feeling of life as a process of ascension, and in the curriculum design, we constantly see the teaching material, look at reference see material, meet the problem and not understand we analyzed together or ask the teacher for advice and so on to find a useful to our design of data and material, and then will they become our design such as raw material, through this design we've learned a lot of knowledge, and learn to and familiar with the look-up table and check reference book, also mastered proe and CAD related operations, for parts of the process design had a deep understanding and the understanding of fixture design also has an understanding of and know some basic fixture the specific structure parts, such as flap, drill set, mandrels...... . Through the cooperation and team members make process and fixture that I understand cooperation is very important, division of labor cooperation can work better and faster.
In this course design, the teacher gave us valuable reference opinions, let us know how to complete a course design, how to put your things done, thanks to the teacher carefully counselling. And we have more analysis and problem solving ability. In the process, we found that the most lack is the social practice experience, empty have books theory knowledge, no perceptual cognition, often will likely and actual apart. In general, do this kind of design can make the we will have learned knowledge system related to link, which exposed the deficiencies. Also hope we in the later study can into society, make more social practice, in order to improve their ability to adapt to society.
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