Screw acid pickling processing method

Abstract

The invention discloses a screw acid pickling processing method. The screw acid pickling processing method comprises the steps of (1) feeding materials, wherein products needing treatment are lifted and placed in an annealing furnace, the annealing furnace is tightly covered with a furnace cover; (2) raising temperature, wherein the temperature in the annealing furnace is slowly raised to 680-760 DEG C from the normal temperature within 3-4 hours; (3) keeping the temperature, wherein if the materials are 1018 wires or 1022 wires, the temperature is kept for 4-6 hours at 680-715 DEG C, and if the materials are 10B21 wires or 1039 wires or CH38F wires, the temperature is kept for 5.5-7.5 hours at 740-760 DEG C; and (4) conducting cooling treatment, wherein the temperature in the annealing furnace is slowly lowered to 550 DEG C or below within 3-4 hours, and then the temperature of the products is lowered to the normal temperature through furnace cooling. According to the screw acid pickling processing method, the wires are heated to an appropriate temperature, the temperature is kept for a certain time, and then slow cooling is conducted; and in this way, the crystalline structure is adjusted, the hardness is lowered, and the normal temperature machining performance of the wires is improved.

Description

technical field [0001] The invention relates to a screw pickling processing method. Background technique [0002] Screws are usually blackened. For aesthetics, some screws are blackened while this is done with a grinding wheel. [0003] The friction is blackened, but some screw processing devices at this stage usually have different degrees of friction because the grinding wheel is too close or too far away from the screw, resulting in different coarse or fine specifications of the screw, which seriously affects the production efficiency of the screw. Contents of the invention [0004] The object of the present invention is to provide a screw pickling processing method, remove the oxide film on the surface of the wire, and form a layer of phosphate film on the metal surface, to reduce the damage to the tool and mold during the processing of wire drawing, cold pier or forming. scratches. [0005] In order to achieve the above object, the present invention adopts the follo...

AI Technical Summary

Problems solved by technology

[0003] The friction is blackened, but some screw processing devices at this stage usually have different friction degrees because the grinding wheel is too close or too far away from the screw, resulting in different coarse or fine specifications of the screw, which seriously affects the production efficiency of the screw