This article is a detailed introduction for those who want to know and buy spark erosion machines, to help them understand the field of discharge machine faster. CHAPTER 1 Definiation Of Spark Erosion The principle of Spark Erosion machining process is to remove excess metal using electrical corrosion (pulsed spark discharge) between the tool and the workpiece, in order to achieve the desired size, shape and surface quality of the workpiece. As shown in the figure, the workpiece and the electrodes are respectively connected to two electrodes of different polarities of the pulse power supply. The Materials Needed For EDM Spark Erosion Machines Electrode: Electrodes are commonly used materials with good electrical conductivity, high melting point and easy processing, such as copper, graphite, copper-tungsten alloy and molybdenum. During the machining process, the electrode will be wearing off, but it is less than the amount of removal of the workpiece metal, and even close to no loss. Below are electrode materials for each types of CNC spark erosion machine: CHAPTER 2 Types Of EDM Spark Erosion Machine Spark Erosion is the most widely used processing method in the electrical discharge industry. According to the relative movement of the electrode and the workpiece, it can be roughly divided into CNC DIE SINKING EDM, WIRE CUT EDM and SMALL HOLE DRILLING EDM MACHINE. Among them, wire cutting processing accounts for 60% of EDM, and die sinking processing accounts for 30%. With the development of electrical processing technology, spark erosion processing has become a symbol of advanced technology, accurate cutting process. Wire Cut EDM Machine Wire EDM is divided into brass wire and molybdenum wire cut EDM. Generally, electrode wires with a diameter of 0.1mm~0.3mm are used to process straight-grained parts, which can be punch parts or die holes. 1. The electrode and the workpiece move simultaneously in two horizontal directions; 2. Cutting various dies and parts with ruled surface; 3. In cutting tools, precision small parts and special materials Die Sinking EDM Machine The tool electrode is usually a copper or graphite forming electrode, which can be any shape that can be produced, and the processed shape is the corresponding cavity. 1. There is only one relative axis movement between the tool and the workpiece 2. The tool is an electrode, which has the same cross-section and corresponding shape as the surface to be machined 3. Peneration processing: processing various punching dies, extrusion dies, powder metallurgy dies, various special-shaped holes and micro holes, etc. 4. Cavity processing: processing various types of cavity molds and various complex cavity parts CNC Drilling EDM 1. Use a thin tube of 0.3-3.0mm brass tube, and pour the high-pressure water-based working fluid into the tube; 2. The thin tube electrode rotates; 3. The perforation speed is very fast (30～60mm) 4. Wire cutting starting hole popper 5. Small holes with a large depth-to-diameter ratio, such as nozzles CHAPTER 3 Advantage Of Spark Erosion Methods 1. Spark Erosion machining can process materials and complex shape workpieces that are difficult to cut by ordinary cutting methods. 2. The eroding process is hardly affected by heat, so the thermal shock layer can be reduced. Because of this the workpiece with high machining quality can be achieved. 3. No defects such as burrs and knife marks and grooves. 4. The electrode material does not need to be harder than the workpiece material, so it is easier to process and manufacture. 5. High security, the working fluid of wire cutting is non-flammable. 6. High machining accuracy Accuracy<0.008mm 7. CNC Die Sinking EDM has excellent surface finishing Ra<0.1um, no polishing required. 8. EDM can eliminate the vertical angle of the workpiece, no R angle. CHAPTER 4 Spark Erosion Applications & Examples CHAPTER 5 Tips of Selecting CNC Spark Erosion Machine 1. Brand of EDM machine Brands can also represent quality, so buying a spark machine also depends on the brand. Recommended brands: Agie Charmiles, Sodick, Mistsubishi, Sammlite Machinery 2. History of Spark erosion machine manufacturing factory The length of production history of the CNC EDM Machine manufacturing plant can tell how stable its products are. 3. Requirements for products There are four main elements of CNC spark erosion machine performance: surface finish, electrode loss, processing speed, and processing accuracy. 4. The size of the processed product Choose edm spark erosion machines with different stroke sizes according to the size of the product to be processed. 5. Processing technology Different choices of EDM machining processes are also different. Available in die sinking edm, wire cut edm and drilling edm (hole popper). 6. After-sales service capability According to the importance and ability of the EDM machine manufacturer to after-sales service, choose China Spark Erosion machine with guaranteed after-sales service, such as Jiangsu Sammlite Machinery Die Sinking EDM Manufacturere.
