The brake disc is a disc-shaped part with relatively re […]
The brake disc is a disc-shaped part with relatively regular shape. Because the wall thickness is thin, the machining is complicated, and some machining requires high precision of the shape position. Therefore, the blank of the specified shape is generally cast by casting. Brake disc Then, the blank is processed correspondingly to obtain the required parts.
The mechanical processing of gray cast iron brake discs is currently the mainstream production of line-type production, with a full-function CNC lathe, CNC machining center, special CNC grinding machine for brake discs and dynamic balancing machine to form a one-line processing production line. Group line production can achieve the effect of easy control of product processing quality and make the shop beautiful and easy to visit.
The brake disc is an important part of the brake system. The good brake disc is stable, no noise, no jitter. Therefore, the processing requirements are higher, as follows.
First, the brake disc belongs to the cast product. The surface requires no casting defects such as blisters and pores to ensure the strength and rigidity of the brake disc and prevent accidents under the action of external force.
Second, the brakes are used when the brakes are used, so the accuracy of the brake surface is high, and the position accuracy of a certain shape is also guaranteed.
Third, the radial size of the brake disc is relatively large, and the axial direction is relatively small. It belongs to thin-walled disc parts, and some processes may be clamped under the clamping force of the lathe chuck, and special fixtures need to be considered.
Fourth, because the car will produce a very high temperature (300 ~ 500 ° C) when braking, the middle of the brake disc is designed with a duct to facilitate heat dissipation.
Fifth, the hole in the middle of the brake disc is the main reference for assembly. Therefore, the process of processing the hole is particularly important, and should be fully considered in the fixture design to ensure the accuracy of the hole and the roughness requirements.
With the continuous improvement of the technology of vehicle models, the requirements for the safety, environmental protection and skills of parts and components in the world market and the domestic market are constantly improving, and the demand for products from customers is becoming more personalized (phosphory plating, plating). Zinc, electroplating, electrophoresis, partial painting), diversification. Dacromet technology entered the industrial field in the 1960s, applying new environmentally-friendly metal anti-corrosion coatings, environmental protection and high corrosion resistance, and the coating green, construction environmental sanitation and coating use harmless, it has formed Standardization and serialization. At present, it has gradually become a partial replacement process for traditional surface treatment technologies with serious pollution such as galvanizing and phosphating.