This is to use electric energy and chemical energy to dissolve the anode and remove the burr. The anode is between the part and the positive pole of the DC power supply, and the cathode is between the forming tool and the negative pole of the DC power supply. There is a certain gap between the two poles to make the electrolyte circulate. When the anode and cathode are immersed in the solution and charged with direct current, the electrochemical reaction occurs on the anode surface, the dissolved metal and electrolyte form viscous liquid on the part surface, which is concentrated in the low concave part of the part surface, with higher resistance and less corrosion; while the burr protrudes from the part surface, under the influence of temperature difference, the liquid film is difficult to form, and the power line is highly concentrated in the burr after power on The burr nearest to the cathode will be dissolved at the fastest speed until the burr is completely dissolved, and the edge will gradually form a fillet, that is to achieve the purpose of deburring.
Electrolytic deburring machine can be used. When the production batch is not large, the rectifier can be used to convert alternating current into direct current to make simple equipment. According to the structure of the parts, the special fixture (tool cathode) with similar shape to the parts is made of brass or red copper and other conductive materials, and the unprocessed parts are coated with epoxy resin for isolation and protection. The commonly used electrolytes are NaCl, NaNO2 > and NaNO3.
This method is suitable for non-ferrous and ferrous metal parts, especially for parts with complex shape, inner holes, cross holes and inner surface burr which are difficult to remove by mechanical and manual methods. It can remove burr of extra hard parts such as molybdenum, nickel, titanium and quenched parts. The cleaned metal parts will be put into chemical solution (50 ℃), and the metal on the surface of parts will be transferred to the solution in the form of ions. These ions gather on the surface of the workpiece and form a layer of mucus film with high resistance and low conductivity by chemical reaction to protect the workpiece surface from corrosion, while the burr protrudes from the surface and the chemical action will remove the burr. When processing, only one slot is needed. According to different deburring materials, different chemical solutions are used. The main components of the base can be hydrochloric acid, phosphoric acid, sulfuric acid, dihydroxyaniline hydrochloride and water. Chemical deburring is suitable for small metal parts, which can remove the small burr with thickness less than 0.07 mm.
Milling: refers to the use of rotating multi edge tool cutting workpiece, is an efficient processing method. When the tool rotates (as the main motion) and the workpiece moves (as the feed motion), the workpiece can also be fixed, but at this time the rotating tool must also move (complete the main motion and feed motion at the same time). Milling machines include horizontal or vertical milling machines, as well as large gantry milling machines. These machine tools can be ordinary machine tools or CNC machine tools.
Main processing objects:
1) Plane parts
The characteristics of plane parts are that the surface can be parallel to the horizontal plane, or perpendicular to the horizontal plane, or at a fixed angle with the horizontal plane; at present, the vast majority of parts processed on the CNC milling machine belong to plane parts, and plane parts are the simplest type of parts in CNC milling, generally only need to use the two-axis linkage or three-axis linkage of the three-axis CNC milling machine Linkage can be processed. In the process of machining, the machining surface is in contact with the cutter, and the end milling cutter or nose cutter can be used for both rough and finish machining.
(2) Surface parts
The feature of curved surface parts is that the machined surface is a space curved surface. In the process of machining, the machined surface and the milling cutter are always in point contact. Ball end milling cutter is often used for surface finishing
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