a. High manufacturing precision (the accuracy of the mold is mainly determined by the accuracy requirements of the product and the structure of the mold. In order to ensure the accuracy and quality of the product, the precision of the working part of the mold is usually 2 to 4 higher than the precision of the product.) b. Long service life.
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Basic requirements for mold manufacturing
a. High manufacturing precision (the accuracy of the mold is mainly determined by the accuracy requirements of the product and the structure of the mold. In order to ensure the accuracy and quality of the product, the precision of the working part of the mold is usually 2 to 4 higher than the precision of the product.) b. Long service life. C. Short manufacturing cycle (the length of the mold manufacturing cycle is mainly determined by the level of manufacturing technology and production management) d. Low mold cost
The main features of traditional mold manufacturing technology and modern manufacturing technology
a. The quality of the master model depends on human factors, the reproduction ability is poor, and the overall level is not easy to control: the quality of modern model depends on material factors, the reproduction ability is strong, and the overall level is easy to control. b. The traditional mold-making is carried out in serial mode, which is easy to cause disjoint design and manufacture, repeated labor and long processing cycle: modern molds are carried out in parallel, and the design and manufacture are based on a common mathematical model, which can be used in the overall mold plan. Under the guidance of parallel communication through public databases, mutual coordination, sharing information, less duplication of labor, and short processing cycle. C. The traditional mold can only be used to evaluate the quality of the mold through trial mode. There are many repairs and high cost: modern molds improve the mold structure through computer data simulation and simulation technology, with less repair and low cost.
Advanced manufacturing technology
a. practicability b. comprehensive c. advanced d. innovation (is the soul) f. agility g. sustainability
The status quo of China's mold industry
China's mold industry started late and has a weak foundation. Compared with industrial developed countries, it has a big gap, but it is supported and guided by the national industrial policies and a series of national economic policies. This year, the focus of China's mold development on precision, large, complex, long-life molds, and achieved gratifying results, mainly in the following aspects: a research and development of dozens of mold new steel and hard alloys, etc. New materials b. New products such as multi-station progressive die and hard alloy have been developed. c. Some new technologies and processes have been researched and developed. d. Mold processing equipment has been greatly developed, and domestic precision grinders can be mass-produced. CNC vulcanary milling machine and machining center e.Mold CAD/CAM technology has been widely used. Mold computer simulation technology is also used in mold design and manufacturing. f. All colleges and universities have trained a group of advanced mold technicians. The high-tech content of modern mold manufacturing technology is gradually increasing. Although China's mold industry has achieved great development, it still cannot meet the needs of the rapid development of the domestic economy.
Key technologies for concurrent engineering
a. Structured analysis and design method b. CAX technology c. DFX technology d process modeling and simulation technology f. product data management technology g. integrated coordination technology h. integration framework technology
Numerical simulation system structure
The structure of the simulation system can be roughly divided into: pre-processing part, finite element solver, and post-processor part
Advantages of the machining process simulation system
a. Make the process have better process performance b. Provide an efficient and low-cost verification path c. Due to its virtuality, it can reduce various hardware inputs. d. Quickly verify the existing tool path file and correct possible errors. e. It can be used as a virtual training platform for technicians such as CNC machining and CNC programming. It is safe and effective, and can save a lot of expenses.
Advantages of PDM
a. shorten the delivery period b. improve design efficiency and production efficiency c. improve the accuracy of design and manufacturing d. protect data integrity e. better use creative team spirit f. use comfort g. better control Project h. Better management of engineering changes i. An important step towards total quality management
Product Data Management Architecture
The product data management architecture consists of four layers: a. system layer b. object layer c. functional layer d. interface layer
Engineering problems to be solved during the data collection process
a. Equipment accuracy and calibration b. Workpiece positioning and clamping c. Workpiece shape and surface quality d. Noise point processing f. Normal distribution of multiple scans
Specific content of point cloud model preprocessing
a. Generation of compensation points b. Noise point deletion c. Data point refinement d. Data point encryption f. Coordinate transformation g. Data output
Basic steps for reverse engineering engineering applications
a. Knowledge of product samples/models b. Workpiece data acquisition and preprocessing c. Model reconstruction d. Conventional follow-up work including CAM programming, rapid prototyping, mold design and manufacturing, etc.
Characteristics of RPM technology
a. High-speed flexibility b. Highly integrated technology c. Design and manufacturing integration d. Rapidity f. Free-form manufacturing g. Extensive material.
Advantages of rapid prototyping
a. From the design and engineering point of view, more complex parts can be designed without the limitations of time, time and manufacturability, and the optimized constraints are reduced. The part design does not need to consider the limitations of the blank shape, tooling fixtures, etc. The tool is divided into a plurality of parts by the limitation of the machining capability, and the number of parts is reduced, which reduces the precision of the design and the assembly time. b. From the manufacturing point of view, reduce the design, design, processing, inspection tools, this "net forming" method, reduce material waste, reduce raw material storage freight, etc., no tool wear, good parts consistency. c. From the perspective of the market and users, reduce risks, change products in real time according to market demand, diversify products, can be personalized design, order-oriented production, maintenance parts production for after-sales service will also flexible.
STL file format rules
a. common vertex rule b. orientation rule c. value rule d. full of rules
Defects in the STL file format
a. When the two surfaces intersect, a triangle that violates the common vertex rule appears, causing a gap. B. Incorrect cracks or voids c. Triangular patches are too much or too little f. Minor features are missing or wrong
Rapid prototyping requirements for materials
a. Conducive to rapid and accurate forming b. When the prototype is directly used as a part or mold, the mechanical and physical properties of the prototype should meet the requirements of use. c. When the prototype is used indirectly, its performance is conducive to fast and accurate follow-up. Process and application processes, but different fast-paced methods have different requirements for prototype material performance. The different uses and post-processing of the prototype will also place different requirements on the prototype material.
The main steps of rapid prototyping technology to directly manufacture molds
a. Using the 3D CAD model, the sintering station now produces prototypes of the product parts, evaluates and modifies them, then converts the product part design into a core design, and converts the CAD files of the core into STL format, input to the sintering station b. Sintering The computer system of the station processes the core CAD file, and sinters the powder into a core semi-finished product according to the profile of the slice. c. Put the prepared core semi-finished product into the polymer solution, perform the first dipping, and then put it into the drying. The gas control furnace evaporates the polymer contained in the semi-finished core of the core, and then infiltrates the copper to obtain a full-density core d. The cavity is polished, and the core is inserted into the mold blank to complete the manufacture of the injection mold.
High-speed cutting advantages
a. high material removal rate b. low cutting force c. less thermal deformation d. high processing efficiency e. achieve high precision machining g. increase machine tool structural stability h. good technical and economic benefits
High speed cutting supply application
a. In the aviation industry sector, modern aircraft adopts the overall manufacturing and processing technology, which requires high-precision, high-quality aluminum alloy or titanium alloy components to be machined by cutting. b. In the mold industry, high-speed roughing and hardening, telling finishing It is also very promising and has a tendency to replace EDM and polishing. c. In the circuit board manufacturing industry, there are many small holes in the circuit board, in order to improve the cutting speed and efficiency of the small diameter drill bit. High-speed cutting is also common
High-speed cutting requirements for machine tools
The machine tool should have a. high speed spindle b. high speed feed mechanism c. high speed CNC control system d. high speed cutting machine tool cooling system e. high speed cutting machine tool safety protection and real-time monitoring system f. high speed cutting machine tool changing device g. high speed cutting Machine tool temperature control system
High speed cutting mechanism
At high-speed cutting, there are two types of continuous cutting and interrupted cutting: high-speed cutting, high thermal conductivity, low-hardness metal or alloy, easy to form continuous cutting; high-speed cutting, low thermal conductivity, densely packed hexagonal polycrystalline structure, high hardness material Easy to form interrupted cutting.
Comparison between high speed milling and traditional milling
High-speed milling is the same as traditional CNC milling. It has the same process parameters, feed rate, cutting speed and depth of cut. It also requires cutting tools and NC programs. Difference: The main difference is the value of the process parameters for feed rate, cutting speed and depth of cut. High-speed milling uses high feed rates and small cutting parameters; traditional CNC machining uses low feed rates and large cutting parameters.
Advantages of high speed milling
a. good processing quality b. long service life of the tool c. high working efficiency d. low total processing cost f. direct processing hardened mold g processing high quality models and samples
Comparison of high speed milling and EDM of mold
High-speed milling is mainly used to process cavities and three-dimensional contours with less complex shapes; it has the characteristics of low cost, good precision, and simple tools, while EDM generally processes bond seams, deep grooves and very fine textures; High, high precision, special tool processing and so on.
High-speed milling requirements for machine tools
a. High-speed spindle unit b. With a dynamic balance that tells the dynamic balance under rotation, the clamping force can be kept under the action of centrifugal force c. A CNC control system suitable for high-speed cutting d. Have found the tool path The trajectory monitoring system to be processed whose direction changes suddenly.
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