The most popular modern rapid manufacturing die te

2022-08-01
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Modern rapid manufacturing mold technology (4)

2.7.1 dry sand full mold casting

that is, use the purpose of completely dry quartz sand without any binder for modeling, and use the model made of EPS or PMMA foam plastic to coat 0 Mm thick refractory coating with good air permeability to improve the surface finish of castings and prevent sand sticking or box collapse

2.7.2 negative pressure full mold casting

negative pressure full mold casting is also called V-method molding. This technology uses fully dry quartz sand without binder as molding sand and EPS or PMMA foam plastic as model. Under the sealing condition of plastic film, the whole mold is made to avoid the instrument being under load for a long time. Under the negative pressure condition (vacuum degree 0..67mpa), the liquid metal casting can be carried out. After the casting solidifies, the negative pressure can be removed to obtain the casting with smooth surface

2.7.3 resin sand full mold casting

resin sand is used as molding sand. With the increasing risk of cross infection and the gradual strengthening of regulations and supervision, EPS or PMMA foam plastic is used as a model, and the casting is made by liquid metal casting at normal temperature and pressure. Using full mold casting technology to manufacture mold blanks has high dimensional accuracy (ISO9 level), small machining allowance (generally about 5mm), no need for draft angle, no need for core making and core support, saving metal materials and wood for wood models, short manufacturing cycle and low cost. The technology is suitable for the production of large, complex and single piece die blanks. Ceramic mold precision casting, wax loss precision casting and other technologies also show their unique advantages in improving the precision of mold blanks, reducing machining hours, shortening the manufacturing cycle and reducing costs

2.8 other technologies

in order to simplify the structural design of the mold, reduce the mold cost and shorten the mold manufacturing cycle, some new technologies in other aspects have been applied at home and abroad, such as quick change mold 3. Yangxinghu, a senior engineer of Shanghai Academy of Building Sciences, made a report frame, stamping unit, edge surfacing Insert casting, nitrogen spring, etc

2.8.1 application of nitrogen spring in the mold

nitrogen spring is a new type of elastic functional component, which can replace the spring, rubber, polyurethane or air cushion. It can accurately provide blank holder force, generate large initial elastic pressure in a small space without pre tightening, and the elastic pressure is basically constant throughout the working process of the mold. JGJ 94 ⑼ 4 technical code for pile foundation of elastic compression buildings (JGJ 94 ⑼ 4) the force magnitude and the position of the force bearing point can be adjusted at any time, accurately and conveniently, simplifying the structure of die stretching, blank pressing, unloading, etc., simplifying the die design, shortening the die making cycle, making it convenient to debug the die, shortening the time to replace the die, and improving the production efficiency

2.8.2 rapid die change technology

due to the increase of product varieties, the replacement of dies in production has become very frequent. Therefore, how to shorten the downtime of stamping equipment and improve production efficiency has attracted people's attention

at present, some large companies in developed industrial countries have achieved an astonishing rate of mold change. Whether they have rapid mold change technology has become a symbol of enterprise technological progress. The general trend is to reduce the time for mold installation, fixation and adjustment on the equipment. This should be considered not only in the equipment structure design, but also in the mold structure design and standardization. The work on the machine should be done under the machine as much as possible

2.8.3 unit combination technology

stamping unit combination technology is a new process equipment that decomposes conventional stamping dies into simple unit stamping dies, arranges and combines them according to the requirements of process parts, and completes various stamping processes in the same stroke. During operation, the stamping unit is not connected with the slider of the punch, and the stamping work can be completed only by striking the slider. When used alone, it is a complete mold. It can be used for punching, blanking, corner cutting, grooving, cutting and shallow drawing of sheet metal or profile. It has the characteristics of quick assembly, convenient use, strong universality and good economy. It is especially suitable for multi variety, medium and small batch production

2.8.4 edge surfacing technology

in the manufacturing of stamping dies, common gray cast iron is used as the matrix, and high hardness alloy steel is overlaid at the edge to replace the die steel insert. This technology has become one of the world's advanced processes. This is a rapid and economical mold making technology that can save manufacturing hours, save expensive mold steel and shorten the mold manufacturing cycle

the current application of MIG welding technology has greatly improved the speed and quality of edge surfacing. This technology has been widely used in the mold industry all over the world and has achieved good economic benefits

2.8.5 full mold casting die edge insert technology

this is a method of manufacturing die edge by full mold casting process, that is, alloy steel casting insert is used to replace forged alloy steel insert. At present, due to the continuous improvement and improvement of the casting process and heat treatment process, the internal quality of the casting insert has been guaranteed, so its application scope is expanding. The outstanding feature of this new technology of casting instead of forging is to save valuable die steel and simplify the die manufacturing process. Due to the small machining allowance, it saves a lot of machining hours, shortens the die manufacturing cycle and reduces the die cost

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