Summary  Introducing the modern molding tool makes the technique CAD/ CAM and RT development and applications, the point discussed the technical characteristics of modern molding tool and develop the foreground.

Keyword  Modern molding tool technique CAD/ CAM RT

In modern machine manufacturing industry, the molding tool industry has become the national economy in a count for much profession, many developments of new product and production, be depend on in the molding tool to make the technique to a large extent, particularly show the importance in professions, such as automobile, light work, electronics and aerospace...etc. especially. The molding tool make strong or weak and molding tools of ability to make the level high and low, have already become one of the important markings that measures a national machine  manufacturing technique level, affecting the national economy directly in many developments of section.
   The development of the modern industry, to the technical request of molding tool more and more high. Take a comprehensive view of the modern molding tool technique, just to as follows of direction development:

(1)High accuracy

The accuracy of the modern molding tool requests to compare the molding tool accuracy of the tradition at least high one  piece quantity class.

(2)Long life span

The life span of the modern molding tool compares the life span of the traditional molding tool to want the high 5-1000%.If the modern molding tool all can attain generally 5,000,000 times above, tallest can amount to 600,000,000 times it is many.

(3)High rate of production

Because the adoption has another the class of the work into the mold, many ability mold, many the  notes the mold of  and layers to note the advanced molding tool of etc. of the  mold, can raise the rate of production biggest, thus bringing economic performance of show .

Such as use four the work note the mold production plastics  soda bottle, the per hour can produce more than 8000.
(4)Structure complications

The Along with  the demanding  diverse and  characteristic and  many new material, the new craft  of society  of extensive applied, request to be increasingly complicated also to the structure form and the modern molding tool. If adopt the traditional molding tool  manufacturing method, not only the cost is high, the rate of production is low, and the quantity of the very difficult assurance molding tool request.
   The traditional molding tool design makes the technique, the root can't satisfy the request of market to molding tool. Therefore, research to manufacture and develop the new molding tool design and make the technique power at go necessarily. The molding tool CAD/ CAM and the RT( Rapid Tooling) techniques is developed out under this kind of situation exactly of, and developed the important function in the production of the modern molding tool.

1．Molding tool CAD/ CAM

The molding tool CAD/ CAM is a foundation that develop respectively in the molding tool CAD and the molding tool CAMs up develop of, it is the calculator technique to synthesize in molding tool produce an applied leap lately.

Adopt the lone CAD and CAM technique designs produces the molding tool, in regard to its  whole production line, design the production line to without essence to change with the traditional molding tool, still dichotomous link- design and make, and two s have the obvious boundary, the diagram paper is they deliver the most important means of information.

The molding tool CAD/ CAM then contact closely the CAD and CAMs, carrying out the design manufacturing integral whole to turn, in fact the quality is a comprehensive calculator of design and manufacturing to turn. In the system of CAD/ CAM, several models of the product are the concerning the most basic core data in products, and be the whole design and compute, analyze the process in the most original data. Its result can the usage database and the network techniques is saving it and deliver the production to make each parties concerned of the link directly, thus carrying out the integral whole of design the manufacturing to turn. At this time, the diagram paper is not the boundary of design and the manufacturing link any more, is also not unique basis that makes the process any more, after system in what to deliver is the whole design, compute and analyze a great deal of information that acquisition get. The molding tool CAD/ CAM technique so can get the development and extensive applications very soon, mainly is it has as follows some characteristics:

（1）The knowledge, technique is intensive, the comprehensive is strong. The molding tool CAD/ CAM technique is to be made the technique and calculators by various forerunners technical of comprehensive, its knowledge, technique is highly intensive, involving the course realm to have another, the knowledge face widely, the technique is stronger, this will beg the employee to not only need to have the higher professional technique and technical abilities, but also to have many comprehensive knowledge and techniques of the course.

（2）The rate of production is high, the economic performance shows .The molding tool CAD/ CAM technique can raise the rate of production and economic performances biggest, occupying to close the data covariance analysis, using the traditional method manufacturing molding tool from designing to make into the product to deliver goods, needing a few months about. But the adoption molding tool CAD/ CAM technique then can shorten for more than ten days even several days, this won time in vehemence of market compete for the business enterprise, to create good economic performance.

（3）Be advantageous to the exaltation molding tool standardizes the degree, developing the person's creation biggest. Standardize the work can availably promote technical development of the molding tool CAD/ CAM, but the molding tool CAD/ CAM then requests the molding tool design process to standardize, the standardize of the molding tool structure, the molding tool manufacturing process standardizes to standardize with craft conditionally.

（4）Renew the speed quickly, the beginning starts the investment greatly. The technical renewal speed of the molding tool CAD/ CAM is quick, can adapt the variety of the market situation, bring the very high performance for the business enterprise, but its beginning start the investment is huge, this is also applied important factor of the check and supervision molding tool CAD/ CAM expansion.
  （5）The adaptability is wide, this is the molding tool CAD/ CAM technical again one characteristics. It not only cans be adapt in the large business enterprise, ands but also is applicable to the medium and small scaled business enterprise.

The molding tool CAD/ CAM technique is still technique in continuously develop, the tallest stage that it develop is a calculator to gather the manufacturing system( CIMS), its target is the molding tool manufacturing to automate completely, this research development and the funds of a huge sum of that will beg to compare the long time throw in. The people believe that along with the CAD/ CAM technical develop continuously and perfect, will develop the huge function in the machine manufacturing industry necessarily, bring economic performance that can't estimate for the society.

2．The fast molding tool makes the RT

The fast molding tool manufacturing is a fast prototype RP to make successful application in the profession in the molding tool.

Pass the contrast can see clearly, the molding tool RT compared the craft process of the CAD/ CAM to reduce many links, as a result can shorten the design manufacturing period of the molding tool consumedly, raising to labor the rate of production. Cast the nicety, the in the center soft mold transition method and the electricity sparks process, the metals sprays to draw, grind etc. the advanced molding tool  manufacturing technique and the RP knots put together, can make a various simple molding tool and the steel( iron) molding tool quickly. The Process the  method to  compare with  the CNC, the RT  can make  the manufacturing  cost and  the manufacturing  periods of  the molding  tool reduce 1/3-1/10, the whole  expenses lowers to 1/3-1/5, the economic performance shows the very. Particularly to special complicated medium small scaled molding tool of shape, its superiority is more outstanding.

Currently, the fast molding tool RT mainly is apply in to note the mold and hurtle to press the aspects, such as mold and mold for casting...etc., it makes the craft method to mainly have the indirectly of RP system mold and makes the mold directly on the system of RP two kinds of, there are three kinds of craft routes of typical model. One is the product manufacturing of a small batch quantity, it makes use of the RP the fast  prototype technique and vacuums note the technique , making the resin molding tool directly; Two is the manufacturing of the spare parts of medium etc. batch quantity, its craft project is to make use of the fast prototype of RP, adopting to spray to draw the technique manufacturing metals quickly cold spray the mold( spray to draw in the molding tool surface a thin hull of the layer metals, body still is plastics), this kind of molding tool can used for 3000 note the production of the piece  as follows; Three is the large quantity to produce the type, the craft route makes use of the RP manufacturing  graphite electrode first, then pass to give or get an electric shock the spark to process the steel mold, it is applicable to more than ten thousand large quantities quantity production.

Synthesize the fast molding tool manufacturing RT technique, it makes the technique and the molding tool CAD/ CAMs with traditional molding tool to compare, still having as follows characteristics:

（1) Make the method in brief, the craft scope is wide

Because the fast molding tool manufacturing pursues the layer to pile up according to the material of take shape the method, the craft process is opposite simple, convenient and fast, it not only can adapt the molding tool production of a small batch of various production type, but also can adapt various molding tool of complicated degree manufacturing; It since can make the plastics molding tool, also can make the metals molding tool. The structure of the molding tool is more complicated, the superiority of the fast molding tool manufacturing is more outstanding.

（2）The molding tool material is durable to turn and reunite to turn

The fast molding tool make the craft and can make use of expediently to increase the chemical element or crystallize the core in the metal alloy, changing the metals concretion means such as process or hot processing etc., ameliorable and raise the function of the molding tool material; Increase other materials in the metal alloy perhaps, can make the compound material molding tool.

（3）Design the period short, the quantity is high

Because the RT molding tool designs the factor of the very few dependence person, as a result can lower availably the artificial design blemish. The designer can make use of the high accuracy model of the manufacturing of RP, at design stage can to product of whole or the part carry on the assemble and comprehensive evaluations, and improve continuously, raising the design quantity of the product consumedly.

（4）The manufacturing service of the easy to long range

Because RT to technical application of information, shortened the distance between customer and manufactory, make use of the Internet and can carry on the long range design and the long range services, can make limited resources get well exertive, the need of the customer can get quickest respond to.

The RP is a 80's to just develop high and new-made to build the technique, the fast molding tool  manufacturing( RT) technique is applied this technique to reform the technical and successful example of traditional molding tool. Because the RT shows the economic performance  , the industry field throws in a great deal of manpower and funds to the RT research in recent years, up to the present there is already more than 300 RTs  service organization in world, as a result promote the fast development and application of this technique.

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