Preparation technology of high-precision copper and copper alloy medium and heavy plates

The technological process of a preparation technology of high-precision copper and copper alloy medium and heavy plates comprises the following steps: burdening->smelting->covering->casting->heating of casting ingot, hot rolling->milling->pre-finishing rolling->pre-finishing rolling annealing->finished product rolling->finished product straightening->finished product cleaning and passivation->finished product drying->finished product shearing->packing and storage; a low-speed milling is adopted for the milling of the present invention, and a non-woven fabric is padded after the milling to prevent and reduce surface defects; the shearing control mode is changed by the shearing length of finished products: calculating the weight of the sheared products beginning at the flying shear is changed into at the crop shear which produces the finished products about 10 m more for each batch of material rolls; the plate is sheared in a thick sheet shearing by length, and the width of finished products is saw cut by an ac