The method of extending die number of die casting die.
Die casting mould because of the long production cycle, large capital contribution, high precision of manufacture, so the cost is high, so the expected mold has a high use of longevity. However, due to the influence of a series of factors such as data and mechanical processing, the mould is invalidated prematurely and thus greatly spoiled.
The failure modes of die casting die are: sharp Angle, crack, split, thermal crack (crack), wear, erosion, etc. The primary reasons for the failure of die casting die are the defects, processing, application, repair and heat treatment of the data itself.
The shortcomings of the data itself.
As everyone knows, the application condition of die casting mould is very bad. Aluminum die casting mould, for example, aluminum melting point is 580-740 ℃, when using, aluminum liquid temperature control in the 650-720 ℃. In the case that the mold is not preheated, the external temperature of the cavity is heated from room temperature to liquid temperature, and the appearance of the cavity is subjected to great tensile stress. When opening the top part, the appearance of the cavity is subjected to great compressive stress. After thousands of die-casting, the appearance of the mold cracks and other shortcomings.
It can be seen from this that the application conditions of die casting are urgent and hot and cold. The mould materials should be made of cold and hot fatigue resistance, fracture toughness and thermal stability. Cr5mov1si H13 (4) is now using a wide range of information, it was reported that 80% of cavity abroad adopt H13, now is still a lot of domestic use 3 cr2w8v, but 3 cr2w8vt_ art function owe good, poor heat conductivity, high coefficient of linear expansion, work in a large thermal stress, cause mould crack break even, and heating of decarburization, falling mould wear resistant function, thus to filter material.
Martensitic aging steel is suitable for mold with low resistance to abrasion and corrosion resistance. Tungsten molybdenum and other heat resistant alloy is limited to cracking and corrosion is severe small blocks, although these alloy that is crisp and notch sensitivity, but its strength is outstanding thermal conductivity, the demand for cooling and can't set the channel thickness of die casting die casting mould has excellent adaptability. Therefore, under reasonable heat treatment and production management, H13 still has satisfactory application function.
The data of the die casting mould should be in line with the planning request, and ensure that the die casting dies under the normal operating conditions. Therefore, before the production of the production, a series of data should be checked to prevent the failure of the materials to form the waste and processing costs. The commonly used inspection methods are microscopic corrosion check, metallographic view, ultrasonic inspection.
(1) microscopic corrosion inspection. The first view of the data is porous, partial, crack, crack, non-metallic mixing and the appearance of hammer crack, joint.
(2) metallographic view. The first view is the segregation of carbides on the crystal boundary, the dispersion conditions, the crystallinity and the intergranular mixtures.
(3) ultrasonic inspection. First look at the internal flaws and the details.
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