This is to use electrical and chemical energy to dissolve anode and remove burr. The anode is on the side of the positive pole of the part and the DC power supply. The cathode is connected with 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 connected with direct current, electrochemical reaction occurs on the anode surface. The dissolved metal on the surface of the part forms viscous liquid with high resistance and small corrosion. The burr protrudes from the surface of the part, and the liquid film is difficult to form under the influence of temperature difference. After power on, the power line is highly concentrated on the burr The burr nearest to the cathode will be dissolved at the fastest speed until the burr is completely dissolved and the edge gradually forms a fillet, that is to say, the purpose of deburring is achieved.
Electrolytic deburring machine can be used. When the production volume is not large, a simple equipment can be made by converting the alternating current of rectifier into direct current. According to the structure of the parts, the special fixture (tool cathode) similar to the part shape is made of brass or red copper and other conductive materials. The unprocessed parts are coated with epoxy resin for isolation protection. The commonly used electrolytes are NaCl, NaNO2 > and nano > 3.
This method is suitable for nonferrous and ferrous metal parts, especially for parts with complex shape and burr on inner hole, cross hole and inner surface which are difficult to remove by mechanical and manual methods. It can remove the burr of extra hard parts such as molybdenum, nickel, titanium and quenched parts. Put the cleaned metal parts into the chemical solution (50 ℃), and the metal on the surface of the 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 sticky film with high resistance and low conductivity through chemical reaction to protect the workpiece surface from corrosion. The burr protrudes from the surface, and the chemical action will remove the burr. When processing, only one slot can be used. According to the different materials of deburring workpiece, different chemical solutions are used. The main components of the base can be hydrochloric acid, phosphoric acid, sulfuric acid, diphenylaniline hydrochloride and water. Chemical deburring is suitable for small metal parts, and can remove fine burr with thickness less than 0.07 mm.
Milling: refers to the use of rotating multi edge cutting tools to cut workpiece, is a high efficiency processing method. When working, the tool rotates (as the main motion), and the workpiece moves (as the feed motion), and 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). There are horizontal milling machine or vertical milling machine and large gantry milling machine. These machine tools can be ordinary machine tools or CNC machine tools.
1) Plane parts
The characteristics of plane parts are shown in that the machining surface can be parallel to or perpendicular to the horizontal plane, and can also form a fixed angle with the horizontal plane. At present, most of the parts processed on the CNC milling machine belong to the plane type parts, and the plane parts are the simplest type of parts in the NC milling process. Generally, only the two axis linkage or three axis of the three-dimensional CNC milling machine is needed Linkage can be processed. In the process of machining, the machining surface is in contact with the cutter, and the end mill or nose cutter can be used for rough and finish machining.
(2) Curved surface parts
The feature of curved surface parts is that the machining surface is a spatial surface, and the machining surface and milling cutter are always in point contact in the process of machining. Ball end milling cutter is often used for surface finishing.
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