(mold; mould; die; tooling; matrix; pattern) A variety of molds and tools used in industrial production to obtain the desired product by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping, stretching and other methods. Introduction to edit this paragraph In short, the mold is used to mold the object of the tool, this tool has a variety of parts composition, different mold by different parts composition. It is mainly used to process the shape of an article by changing the physical state of the material to be molded. Simple classification edit this paragraph According to the molding of different materials, molds can be divided into metal molds and non-metallic molds. Metal molds are divided into: casting molds (non-ferrous metal die-casting, steel casting), and forging molds; non-metallic molds are also divided into: plastic molds and inorganic non-metallic molds. According to the different materials of the mold itself, the mold can be divided into: sand mold, metal mold, vacuum mold, paraffin mold and so on. Among them, with the rapid development of polymer plastics, plastic molds and people's lives are closely related. Plastic molds can be generally divided into: injection molds, compression molds, extrusion molds, gas-assisted molding molds, vacuum molds and so on.
Mass production of non-sheet metal steel parts - cold heading, die forging, metal molds, etc.
Sheet metal out of the material - hot rolled, cold rolled, hot rolled, cold rolled
Sheet metal processing - -Drawing, rising, bending, punching, dropping
Non-ferrous metals - die-casting, powder metallurgy
Plastic parts - injection molding, blow molding (plastic bottles), extrusion (pipe fittings) compression, vacuum < /p>
Mold other categories:
Alloy mold
Sheet metal mold
Plastic mold
Stamping mold
Casting mold
Extrusion mold
Die casting mold
Other molds Mould production process Editorial section The mold is a model, in accordance with this model to make Products to, but the mold is how to produce it, may be in addition to the mold professionals most of the answer is not out. Molds have been in our lives in an irreplaceable role, most of our daily necessities are inseparable from the mold, such as computers, telephones, fax machines, keyboards, cups and so on these plastic products needless to say, in addition to automobiles and motorcycle engine cover is also done with the molds, the light of a variety of automotive molds to be used more than 20,000. So the role of modern life mold is irreplaceable. As long as the mass production can not be separated from the mold, at least in the last 50 years can not be separated.
Mechanical [jīxiè]
1. [machine; machinery]: the use of mechanical principles of the device
2. [mechanical; rigidly; inflexibly]: the analogy of sticking to the rules, stereotypes and do not know the change
Machine (machine), from the Greek mech. The modern Chinese word "machinery" for the institution of the English (mechanism) and machine (machine) of the general term. Mechanism is characterized by: machinery is an artificial combination of physical components. Mechanical parts have a definite relative motion between them. Machine has the characteristics of the institution, but also must have the third feature that can replace human labor to complete the useful mechanical work or conversion of mechanical energy, so the machine can convert mechanical energy or complete the useful generation of mechanical principle of the most basic concepts, the modern concept of the Chinese machinery is derived from the Japanese word "machinery", the Japanese mechanical engineering on the Mechanical concept of Japanese mechanical engineering to do the following definition (i.e., in line with the following three characteristics known as mechanical machine):
Machine is a combination of objects, it is assumed that the force added to the various parts of its difficult to deform.
These objects must realize each other, single Transform the applied energy into the most useful form, or into effective mechanical work.
The concept of machinery
Chinese concept
The word "machinery" consists of two Chinese characters: "机" and "械" (mechanical). "Machine" - originally refers to a localized key mechanism; "Mechanical" - in ancient China originally refers to a whole apparatus or apparatus. These two characters are linked together to form the word "machinery", which constitutes the general concept of machinery.
"Machine" in ancient Chinese originally referred to some kind of specific device, and later referred to the general machinery. Shangshu - Taijia" has "if Yu machine Zhang, to the province in the degree, then release. Zhuangzi - the theory of things: "its hair if the machine." The "interpretation of the text" said: "machine, crossbow teeth; bracket, arrow bracket." The Shuowen Jiezi interpretation of "machine" is "machine, the main hair also", referring to the crossbow. Zhuangzi - mountains and forests" said: "Fung Fox, Wen Leopard ...... is not exempt from the net of the machine to open up the problem" that refers to the clamps of a class of devices. The ancient "machine lyric" refers to the loom. The huainanzi - panorama" contained "ber Yu of the beginning of the clothing also, ...... hand by finger hanging, its into is like a net Luo. The later generations for the machine Lyric Sheng Fu so that it can be used." The Historical Records - Li Sheng biography of the "farmer Lei Lei, two women under the machine". From this, we can see that the original meaning of "machine" refers to the mechanical device that constitutes the rotating part of the rotating components.
The term "machine" in ancient China refers to physical objects such as instruments and artifacts. Zhuangzi - Heaven and Earth" in "there are instruments in this, a day soak a hundred beds, the force is very little and see the work more", the "armament" here for the general instruments or appliances; "Mozi - Gong输"："Gong输般为楚造云梯的械 "Here refers to weapons;" "Han Book - Sima Qian biography" contains: "Huaiyin (Han Xin), the king, also received the armament in Chen", here "armament" refers to instruments of torture.
"Zhuangzi - outside - heaven and earth twelfth" contained "...... Zigong said: 'There is a weapon here, a day to dip a hundred beds, the force is very little but see more work, husband does not want it?' The gardener looked up and said, 'What can be done?' He said: 'Chiseling wood into a machine, heavy at the back and light at the front, and pumping out water like water, as if it were soup, and its name is Pulley.' For the nursery for the wrath of the color and smiled and said: 'I heard of my teacher, there are machines must have organic matters, organic matters must have organic heart. Machine heart stored in the chest, then pure white is not ready. Pure white is not ready, then the gods are uncertain. Shen Sheng uncertainty, the road is not carried. I am not unaware of this, but I am ashamed not to do it. Zigong was concealed, and bent down and did not respond." This dialogue gives a definition of the concept of machinery for Zigong's conversation with the old man, i.e., "Machinery is an instrument that can do little work but much work". In Han Fei Zi, Volume 15, Difficulties II, there is a similar statement: "If one examines the terrain, the boat, the vehicle, and the advantage of the machinery, and if one exerts little effort and achieves much work, then one will enter much." Therefore, China at the latest in the Warring States period has formed with the modern mechanical engineering of "mechanical" meaning more similar concepts.
Western concept
The earliest definition of "machinery" in the West was given by the Roman architect Vitruvius in his work "Ten Books of Architecture" as "machinery is a device that combines wood, mainly for the handling of heavy objects to play a role. Vitruvius, in his work "Ten Books of Architecture", gives it as "a machine is a device for combining wood and is mainly effective for carrying heavy loads", and distinguishes between a machine and a tool: "There seems to be the following difference between a machine (machane) and an organon. That is, a machine is one that works with a great deal of labor and a great deal of force, as in the case of heavy crossbows and grape presses. Tools, on the other hand, were carefully handled by a single manipulator to achieve their purpose, such as the scorpion-shaped light crossbow or the unequal-circle spiral device. Thus both tools and machinery are indispensable for utilization." Heron of Alexandria, who first discussed the basic elements of machinery in the 1st century, identified five categories of mechanical elements: wheels and axles, levers, pulleys, pointed cleaves, and spirals. Heron's discussion reflects the characteristics of classical machinery.
Leopold, a German mechanic from Leipzig in 1724, defined it as "a machine or tool is an artificial device by which a favorable motion is produced; and at the same time it saves time and power where it cannot be saved by other means". The definition given by the English mechanist R. Willis in his The Principle of Mechanism (1841) is: "Any machine consists of a group of members connected in various ways, so that if one of the members is moved, the rest will undergo a certain motion, and these members are connected with the other members in such a way as to produce a favorable motion. certain motion, and the relative motion of these members to that of the member initially in motion depends on the nature of the connection between them." The German mechanist F. Reuleaux, in his Theoretische Kinematik (Grundzüge einer Theorie des Maschienenwesens, 1875), defines a machine as "an assembly of a number of resisting bodies, configured in such a way as to make it possible for a number of them to resist. which are configured in such a way as to be able to force the mechanical forces of nature to do work by means of them, accompanied by a certain definite motion."
Overall, machines are tools and devices that help people reduce the difficulty of their work or save energy. Items like chopsticks, brooms, and tweezers can be called machines, and they are simple machines. Complex machines are made up of two or more simple machines. We usually call these more complex machines machines (Science Textbook for Lower 5th Grade). Characteristics of Machinery Edit This section Machinery is a man-made assembly of physical components.
The parts of a machine have a definite relative motion between them.
Machines have the characteristics of institutions in addition to the third characteristic must be able to replace human labor in order to complete a useful mechanical work or convert mechanical energy, so the machine can convert mechanical energy or to complete a useful mechanical work of institutions. From the point of view of structure and motion, there is no difference between a mechanism and a machine generalized as a machine. Mechanical - the definition of mechanical edit this paragraph mechanism and machine definition from mechanical engineering, belongs to the modern mechanical principles of the most basic concepts, the modern concept of Chinese machinery more from the Japanese word "machinery", the Japanese mechanical engineering concept of machinery to do the following definition (that is, in line with the following three characteristics known as the mechanical) Machine):
Machine is a combination of objects, assuming that the force added to its various parts are difficult to deform.
These objects must achieve mutual, single, prescribed motion. The transformation of applied energy into its most useful form, or into effective mechanical work.
A general term for all machines and mechanisms with a defined system of motion. Such as machine tools-tractors, etc.; dull; inflexible.
Mechanical engineering is the theoretical basis of the relevant natural and technical sciences, combined with the technical experience accumulated in production practice, research and solve the theoretical and practical problems in the development and design, manufacture, installation, utilization and repair of a variety of machinery in an applied discipline.
The development of various engineering fields require mechanical engineering to have a corresponding development, all need mechanical engineering to provide the necessary machinery. The invention and perfection of certain machinery, and will lead to the emergence and development of new engineering technologies and new industries. For example, the success of the manufacture of large-scale power machinery, leading to the establishment of the electric power system; the invention of locomotives led to the rise of railroad engineering and railroads; the invention and progress of the internal combustion engine, gas turbines, rocket engines, etc., as well as the development of airplanes and spacecraft led to the success of aviation, the rise of the aerospace industry; high-pressure equipment led to the success of many new synthetic chemical engineering, etc..
Mechanical engineering is the ability to gain momentum under the pressure of ever-increasing demands in all areas, and at the same time to improve and innovate from advances in various disciplines and technologies.
1Common explanation:
Mechanisms are simple devices that transfer energy, force from one place to another. It can change the shape structure of an object to create new objects . In life, we are surrounded by countless different kinds of machinery working for us.
The everyday understanding of machinery is mechanical devices, which are various machines and instruments.
2. Explanation of Importance:
From the point of view of the mechanical profession: machinery is of considerable fundamental importance.
Machinery is one of the five elements (i.e., man, money, energy, materials, and machinery) of modern society to carry out production and services.
When Marx spoke of industrial societies, he said that industrial societies, especially large industrial societies, i.e., the age of producing machines with machines.
Whether from the life of contact with a variety of physical devices, such as lamps, telephones, television sets, refrigerators, elevators, etc. are included in the composition of the machine, or in the broader sense of the machinery, and from the production of all kinds of machine tools, automation equipment, airplanes, ships, God V, God VI, etc., are not short of machinery.
Not to mention chemical plants, power plants and so on.
So, it is no exaggeration to say that machinery is a foundation of modern society. If someone wants to say that agriculture is also the foundation, there is no excuse, but in the modern society, machinery as the foundation of the whole industry and engineering, it is no exaggeration to say that it is also a big pillar of society.
Any modern industry and engineering fields need to apply the machinery, is people's daily life, but also more and more use of a variety of machinery, such as cars, bicycles, clocks, cameras, washing machines, refrigerators, air conditioners, vacuum cleaners, and so on.
3, English explanation: machine machine tool mechanical cad/cam/cae/capp/cims
4, related vocabulary:
Machine industry Machine Mechanism Mechanical manufacturing and its automation Workhorse Optimization Design Modern Mechanical Design Methods
Mechanical Design Mechanical design finite element analysis inverse engineering
5, mechanical design manuals: China's mechanical design canon Chinese Society of Mechanical Engineers Mechanical Engineering Journal Huazhong University of Science and Technology Mechanical - the content of mechanical engineering editorial paragraph Mechanical engineering's service field is broad and multi-faceted, where the use of machinery, tools, and even energy and materials production sector, all need the services of mechanical engineering. To summarize, there are five major service areas of modern mechanical engineering: the development and provision of energy conversion machinery, the development and provision of machinery used in the production of a variety of products, the development and provision of machinery to perform a variety of services, the development and provision of machinery used in domestic and personal life, and the development and provision of a variety of mechanical weapons.
Regardless of the field served, the work of mechanical engineering is basically the same, mainly:
Establishing and developing the engineering theoretical basis of mechanical engineering. For example, the study of force and motion of engineering mechanics and fluid mechanics; the study of metal and non-metallic material properties, and its application of engineering materials science; the study of thermal energy generation, conduction and conversion of thermodynamics; the study of various types of mechanical components with independent functions of the working principle, structure, design and calculation of mechanical principles and mechanical parts science; the study of metal and non-metallic molding and cutting and processing of metal technology and non-metallic The study of metal and non-metal molding and cutting processing of metal and non-metal technology and non-metal technology, etc.
Research, design and development of new mechanical products, continuous improvement of existing mechanical products and production of new generation of mechanical products to meet current and future needs.
Production of mechanical products, including: planning and realization of production facilities; production planning and production scheduling; preparation and implementation of manufacturing processes; design and manufacture of tools, molds; determine the labor quota and material quotas; organization of machining, assembly, commissioning, and packaging and shipment; product quality for effective control.
Operation and management of machinery manufacturing enterprises. Machinery is generally a complex product assembled from a number of unique molding, machining process of precision parts. The production batch has a single piece and small batch, but also in the batch, large quantities, up to mass production. The sales targets are all over the industry and individuals and families. And the sales volume may fluctuate greatly under the influence of social and economic conditions. Therefore, the management and operation of machinery manufacturing enterprises is particularly complex, the enterprise production management, planning and operation of the study is also mostly originated in the machinery industry.
This aspect of the application of mechanical products includes selecting, ordering, accepting, installing, adjusting, operating, maintaining, repairing, and remodeling machinery and complete sets of machinery and equipment used in various industries, in order to ensure the reliability and economy of mechanical products in long-term use.
The study of mechanical products in the manufacturing process, especially in the use of environmental pollution, and excessive depletion of natural resources, and its treatment measures. This is a particularly important task of modern mechanical engineering, and its importance is increasing day by day. Mechanical-mechanical engineering classification editorial paragraph There are many kinds of machinery, can be divided into various categories according to several different aspects, such as: according to the function can be divided into power machinery, material handling machinery, crushing machinery, etc.; according to the service industry can be divided into agricultural machinery, mining machinery, textile machinery, etc.; according to the principle of work can be divided into thermodynamic machinery, fluid machinery, bionic machinery, etc..
In addition, machinery in its research, development, design, manufacturing, utilization and other processes are subject to several stages of different nature of work. According to these different stages, mechanical engineering can be divided into several branches of the system, such as mechanical research, mechanical design, mechanical manufacturing, mechanical use and maintenance.
These are divided into different aspects of a variety of sub-discipline systems cross each other, overlap each other, so that mechanical engineering may be divided into hundreds of sub-disciplines. For example, according to the function of power machinery, it is divided by working principle with thermal machinery, fluid machinery, turbomachinery, reciprocating machinery, steam power machinery, nuclear power plant, internal combustion engine, gas turbine, and with the center of the industry power plant equipment, industrial power plants, railroad locomotives, ship turbine engineering, automotive engineering and so on, there are complex intersection and overlap of relations. The marine turbine is a power machine, as well as a thermal, fluid and turbomachinery, and it belongs to the ship power plant, steam power plant, and possibly nuclear power plant and so on.
Analyzing this complex relationship and studying the most reasonable branch system of mechanical engineering has some intellectual significance, but not much practical value. Meaning of mechatronics edit this paragraph 1, the Japanese business community in 1970 or so, the first to put forward the concept of "mechatronics technology", when they named "Mechatronics", that is, the combination of the application of mechanical technology and electronic technology in the One. With the rapid development and wide application of computer technology, mechatronics technology has gained unprecedented development, the overall decomposition into a number of interrelated into a comprehensive computer and information technology, automatic control technology, sensing and detection technology, servo drive technology and mechanical technology and other cross-system technology, is currently to the Opto-mechatronics technology (Opto-mechatronics) (Opto-mechatronics). Opto-mechatronics (Opto-mechatronics) (Opto-mechatronics) direction, the wider the scope of application.
Mechatronics technology specifically includes the following:
(1) Mechanical technology Mechanical technology is the basis of mechatronics, mechanical technology is focused on how to adapt to mechatronics technology, the use of other high, new technology to update the concept, to achieve structural, material, performance changes to meet the weight reduction, volume reduction, improve accuracy, improve rigidity and improve performance requirements. Improvement of performance requirements. In the mechatronics system manufacturing process, the classical mechanical theory and technology should be with the help of computer-aided technology, at the same time, which information exchange, access, computing, judgment and decision-making, artificial intelligence technology, expert system technology, neural network technology are computer information processing technology.
(3) system technology
System technology, that is, the overall concept of organizing and applying a variety of related technologies, from the start, the overall decomposition into a number of interrelated functional units, interface technology is an important aspect of system technology, it is the realization of the organic connection between the various parts of the system to ensure.
(4) automatic control technology
its scope is very wide, under the guidance of the control theory, system design, system simulation after design, field debugging, control technology including such as high-precision positioning control, speed control, adaptive control, self-diagnostic correction, compensation, reproduction, retrieval and so on.
(5) Sensing and Detection Technology
Sensing and detection technology is the feeling organ of the system, is to realize the key link of automatic control and automatic adjustment. The stronger its function, the higher the automation program of the system. Modern engineering requires sensors to be able to obtain information quickly and accurately and to withstand the test of harsh environments, and it is a guarantee that the mechatronics system will reach a high level.
(6) servo drive technology, including electric, pneumatic, hydraulic and other types of transmission devices, servo system is the realization of electrical signals to the mechanical action of the conversion devices and components, the dynamic performance of the system, the quality of the control and the function of the decisive impact.
2, mechatronics
(1) training objectives:
This profession cultivates moral, intellectual, physical, aesthetic and labor comprehensive development of mechanical, electronic, hydraulic (gas) pressure integration technology with basic theory, master the operation, maintenance, debugging and repair of mechatronics equipment, master the application of mechatronics equipment processing process design and processing process system control. Requirements to the basic methods of mechanical systems to mention the level of engineering and technical personnel.
(2) Main courses:
Electrical technology, electronic technology, basic mechanical design, machining machine tools, mechanical processing, etc.) and so on are included in it. Mechatronics System Composition Edit Paragraph 1.Mechanical Body The mechanical body includes the frame, mechanical connection, mechanical transmission, etc. It is the foundation of mechatronics, and plays the role of supporting other functional units in the system, and transmitting motion and power. Compared with purely mechanical products, the technical performance of mechatronics system has been improved and functions have been enhanced, which requires the mechanical body to be able to adapt to it in terms of mechanical structure, materials, processing technology and geometric dimensions with high efficiency, multi-functionality, reliability and energy-saving, small size, light weight, and beautiful features.
2. Detection of the sensing part of the detection of the sensing part of a variety of sensors and their signal detection circuits, its role is to detect the mechatronics system in the process of its own work and the external environment of the relevant parameter changes, and will be transmitted to the electronic control unit, the electronic control unit according to the information checked to the actuator to send the appropriate control.
3. Electronic control unit The electronic control unit is also known as and the rhythm of the corresponding instructions to control the whole system purposefully.
4. Actuator The role of the actuator is to drive the movement of mechanical parts according to the instructions of the electronic control unit. The actuator is a moving part, usually using electric drive, pneumatic drive and hydraulic drive and so on several ways.
5. power source power source is a mechatronics product energy supply part of its role is in accordance with the requirements of the system control to the mechanical system to provide energy and power to make the system run normally. Provide energy in the form of electrical energy, gas energy and hydraulic energy, with electrical energy is the main. Mechanical - the development of mechanical engineering history editorial paragraph human beings become "modern man" is the sign of the manufacture of tools. The stone axes, hammers, and simple, crude tools made of wood and leather from the Stone Age were the forerunners of the machinery that came later. It took a long time to evolve from the manufacture of simple tools to the manufacture of modern machinery consisting of multiple parts and components.
Thousands of years ago, mankind has created for grain shelling and crushing mortar and mill, used to carry water pulleys and windlasses, equipped with wheels of the car, sailing in the river boat and oars, sculls, rudders and so on. The power used, from the physical strength of people themselves, to the use of animal power, water power and wind power. Materials used from natural stone, wood, earth, leather, to man-made materials. The earliest man-made materials are ceramics, ceramic ware manufacturing pottery car, has been with power, transmission and work three parts of the complete machinery.
Mankind from the Stone Age into the Bronze Age, and then on to the Iron Age, the development of the blower used to blow the fire played an important role. With a powerful enough blower, the metallurgical furnace can get high enough temperature to refine the metal from the ore. In China, there was a blower for metallurgy and casting from 1000 to 900 B.C., and it gradually developed from human power to animal power and water power.
Before the 15th to 16th centuries, mechanical engineering was slow to develop. But in a thousand years of practice, in the development of machinery or accumulated considerable experience and technical knowledge, and later became an important potential for the development of mechanical engineering. 17th century, capitalism appeared in Britain, France and Western Europe, the production of goods began to become the center of the problem of society.
Late in the 18th century, the application of steam engines spread from mining to textile, flour, metallurgy and other industries. The main material used to make machinery gradually changed from wood to metal, which was tougher but difficult to work by hand. The machinery manufacturing industry began to take shape and became a major industry over the decades.
Mechanical engineering evolved from a decentralized craft that relied heavily on the individual talents and craftsmanship of craftsmen into a theoretically guided, systematic, and independent engineering technology through an ever-expanding practice. Mechanical engineering is to contribute to the industrial revolution in the 18th to 19th century, as well as the main technical factors of capitalist mechanical mass production.
Power is an important factor in the development of production.
In the late 17th century, with the improvement and development of all kinds of machinery, as the need for coal and metal ores increased year by year, people felt that relying on manpower and animal power could not raise production to a new stage.
In Britain, industries such as textiles and milling increasingly located their workshops near rivers, using water wheels to power the working machinery. But the groundwater in the coal, tin and copper mines of the time could still only be lifted and removed by large amounts of animal power. In such production needs, the early 18th century appeared Newcomen's atmospheric steam engine to drive mine drainage pumps. However, this steam engine had a high fuel consumption rate and was basically only used in coal mines.
In 1765, Watt invented the steam engine with a separate condenser, which reduced the fuel consumption rate, and in 1781, Watt created a steam engine to provide rotary power, which expanded the application of the steam engine. The invention and development of the steam engine mechanized mining and industrial production, railroads and shipping. The steam engine was almost the only source of power in the 19th century, but the steam engine and its boiler, condenser, and cooling water system were large, bulky, and inconvenient to apply.
Toward the end of the 19th century, the electric power supply system and electric motors began to develop and promote the early 20th century, electric motors have replaced the steam engine in industrial production, and become the basic power to drive a variety of working machinery. The mechanization of production has been inseparable from the electrification, and electrification through the mechanization of production to play a role.
The initial application of steam engine as the prime mover of the power station, the early 20th century, the emergence of high efficiency, high speed, high power turbine, also appeared to adapt to a variety of water resources turbine, promote the development of the power supply system flourished.
The internal combustion engine, invented in the late 19th century, has been improved over the years to become a light, small, efficient, easy-to-maneuver, and ready-to-start prime mover. It was first used to drive land-based workhorses without electric power, then for automobiles, mobile machinery and ships, and by the mid-20th century for railroad locomotives. The steam engine, sidelined by the steam turbine and the internal combustion engine, was no longer an important power machine. The development of the internal combustion engine and the later invention of the gas turbine and jet engine was one of the technological factors underlying the successful development of airplanes and spacecraft.
Before the Industrial Revolution, machinery was mostly of wooden construction, made by hand by carpenters. Metals (mainly copper and iron) were used only to make instruments, locks, clocks, pumps and small parts on wood-framed machinery. Metal working mainly relied on the machinist's fine work to achieve the required precision. The promotion of steam engine power plant, and the consequent emergence of mining, metallurgy, ships, locomotives and other large-scale machinery development, the need for molding and cutting metal parts more and more, more and more large, the requirements of the accuracy is also more and more high. The application of metal materials from copper, iron development to steel-based.
Mechanical processing, including forging, forging, sheet metal work, welding, heat treatment and other technologies and their equipment, as well as cutting technology and machine tools, cutting tools, gauges, etc., has been the rapid development of the development of various industries to ensure that the supply of machinery and equipment required for the development of production.
Social and economic development, the demand for mechanical products soared. The increase in production batch size and the progress of precision machining technology, promoting the formation of a large number of production methods, such as parts interchangeability production, professional division of labor and collaboration, assembly line and assembly line and so on.
Overall, the mold is better, because nowadays, the progress of society, a variety of things are designers decide