Brake disc has been widely used in the braking system of rail vehicles. Vermicular graphite cast iron is a new engineering material. Its strength, plasticity and toughness are higher than those of gray cast iron, and its damping and thermal conductivity are similar to that of gray cast iron;...
1. Melting process of alloy vermicular graphite cast iron for brake disc (1) Raw materials and chemical composition Pig iron, scrap steel, return charge, Si, Mn, Mo, Cu, Ni, Vermicular Agent and other ferroalloys are selected according to the chemical composition of the furnace charge. Q10 or Q15 pig...
Taking a brake caliper casting of MQB platform of Volkswagen as the research object, a series of research on the feeding system and filling system design of the casting mold was carried out. The deck wall thickness of the brake caliper is large, and there is an isolated hot...
According to the above theory, in order to meet the requirements of the sectional area of the sprue, it is necessary to optimize the connection mode between the sprue and the riser, and to change the sprue into a sheet shape to obtain a lower modulus, so as to...
(1) The 3D scanning equipment is used to scan the casting surface one by one, and then the three-dimensional surface obtained is spliced together through the reference surface, and then compared with the original three-dimensional model, the datum fitting method is selected, and the positioning surface deviation of X,...
The proportion of raw materials for smelting is scrap: recycled material = 4:6, and the composition of molten iron after spheroidizing treatment. The pouring temperature is 1493 ℃, the actual pouring time is 8.5 s, the pouring temperature of the first mold is 1417 ℃, and the pouring temperature...
(1) Confirmation of number of cavities and type of gating system The equipment model is disa230x, and the mold plate specification is 750mm × 535mm. Considering the safety distance of the mold plate, that is, the distance between the cavity or the gating system and the edge of the...
The gating system is composed of a gate cup, a runner, a sprue and an inner gate. It is a channel in the mold to introduce liquid metal into the mold cavity (Fig. ). The role of the gate cup is to carry the molten metal poured into the...
To obtain a dense casting, the sprue cup should be poured as soon as possible and always filled during the pouring process, otherwise the rest of the gating system will not match the calculated performance. A good sprue cup has the following characteristics: (1) It is easy to start...
The flow rate W is defined as the metal weight passing through the cross-sectional area of the gating system within a certain time T. for the mold cavity, it can be calculated by dividing the casting weight g by the total metal filling time t, that is: The flow...