A, the main ingredients: DM32 aluminum: 96.8, manganese: 1.2, cobalt: 0.3, iron: 0.12, silicon: 0.060 (the rest of confidentiality).

2. Notes for production of DM32: it can be seen from the material composition that the material has large solidification shrinkage and thermal expansion coefficient and poor fluidity. According to these characteristics, the notes for production are analyzed.

1, aluminum liquid below 740 degrees, will become viscous, so the production of aluminum liquid temperature should be controlled at more than 740 degrees.

2. The preheating temperature of the mold depends on the concrete state of the workpiece, which is generally between 170 and 260 degrees.

3. Due to the high temperature of aluminum and the large tendency of adhesive mold, the requirements for mold materials and heat treatment are strict.(1) molding parts, such as inserts and cores, are selected from Swedish 8407, Japanese SKD61 or American refined H13, quenching and tempering 45-47hrc and nitrification 500-530hv;(2) ordinary H13 is used for ejector rod, which is quenched and tempered 50-55hrc;

4. Due to poor material fluidity, the mold design should reduce the flow passage as much as possible to ensure the flow passage is smooth;Circular runner design is recommended.

5. In conventional mold design, it is the main principle that the distance from the gate to each part of the workpiece is close or equal;This kind of mold design, to avoid the direct punching cavity, avoid the generation of vortex coil gas as the leading principle;Because of this kind of problem, it is not only easy to cause erosion and viscosity mold, but also lead to the appearance of water pattern during oxidation due to uneven density.

6. The purity of this material is relatively high, and the control of each component is relatively strict;(1) pig iron crucible is forbidden, which destroys the composition of aluminum liquid, increases the content of iron and silicon in aluminum liquid, and affects the oxidation effect of production;Morgan and Vesuvius graphite sic crucible are recommended.(2) control the adding ratio of die-casting waste;A. large pieces of waste materials, such as waste die casting and thick gate, etc., such as impurities not exceeding the standard, the dosage should be controlled at about 60%;B, flash, slag collection package, etc., can be used directly, after remelting, the adding proportion should not be over 30% of super-large;

7. The holding time of the die is more than 1/3 longer than that of ordinary aluminum die casting, which depends on the complexity of the workpiece, wall thickness and other factors to determine;

8. Die-casting workpiece is suitable for post-oxidation after CNC processing, but the deepest processing size should not exceed 50S;

9, due to its large shrinkage coefficient, the mold gate, overflow channel design should pay attention to the following three points :(1), avoid the main parts of the workpiece;(2) choose thinner size as far as possible within the permitted range;(3) pay attention to connection mode, such as inner gate connection, the bottom lap (45 degrees) is recommended.