A casting mold and casting process for automotive water-cooled motor casing castings

Abstract

The invention discloses a casting die of an automobile water-cooled motor casing casting. The casting die comprises an upper die and a lower die, a steel core is also arranged below the upper die, four positioning seats are arranged on the lower die longitudinally and are evenly distributed along the axis of the steel core, a pair of first mobile side dies and a pair of second mobile side dies are also arranged on the lower die, a sand core assembly is also arranged between the upper die and the lower die and consists of a sand core, the shape of the sand core is identical with that of a water way in a motor casing, four strip-shaped locating seats are arranged evenly along the axis of the sand core, the sand core is connected with the stripped-shaped locating seat through a plurality of connecting blocks, a strip-shaped locating slot is formed in each locating seat, and each locating seat is arranged in one strip-shaped locating slot. A casting technology combining low-pressure casting and gravity casting is adopted, and a negative-pressure pumping device is arranged at the locating slot, so that the sequential condensation of the casting and the problem of venting of the sand core can be efficiently solved, and the finished rate of the motor casing casting is greatly improved.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a casting mold and a casting process for a water-cooled motor casing casting of a new energy vehicle. Background technique [0002] refer to Figure 1 to Figure 3 As shown, the water-cooled motor casing of the new energy vehicle is a cast aluminum part with a spiral (or Z-shaped) cooling water channel, which is an important part of the new energy vehicle. In terms of industrial production, the motor casing is generally produced by ordinary low-pressure casting technology in China at present, and is solidified and formed sequentially from top to bottom. The chemical composition of the water-cooling casing material is: Si:6.5-7.5; Fe:≤0.12; Cu:≤0.1; Mn:≤0.05; Zn≤0.05; Ti:0.08-0.20. The requirements for the mechanical properties of the water-cooled casing are: tensile strength ≥ 290 MPa, elongation ≥ 3%, and Brinell hardness ≥ 80. The required pressure is 0.5MPa, and the pressure...

AI Technical Summary

Problems solved by technology

[0003] Due to the complex structure of the water-cooled motor casing, there are multi-circle rib surfaces 1 on the outside, and the outer wall of the casting is also provided with square bosses 5 and hoisting holes 6. There are spiral (or Z-shaped) water channels 8 inside and outside. The boss is installed in isolation, so that there is a large wall thickness difference in the casting, and local overheating will occur, resulting in shrinkage cavities and shrinkage easily appearing on the inner wall, top and boss of the casting. Due to the spiral (or Z Font) waterway 8, waterway 8 is formed by coated sand, the core body is easy to shift during pouring, resulting in low position accuracy of waterway 8, uniform wall thickness, and air hole defects caused by sand mold gas generation often occur during pouring, and even lead to Casting cannot be formed

Therefore, the pass rate of the water-cooled motor casing is low, and there are casting defects such as shrinkage cavities and pores; the finished product often has the problem of pressure test air leakage, and the pass rate is less than 50%.

Therefore, the performance and output requirements of the water-cooled motor housing of new energy vehicles cannot be guaranteed, which once seriously affected the industrialization process of new energy vehicles in my country

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