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Related content about EDM

 In fact, EDM machining is different from other equipment processing methods. EDM is processed by electrode discharge in some specific media to process the workpiece. 

The workpiece is mainly eroded down by high temperature to achieve the effect. The following three points are It is related to electric spark.

1. Remove most of the material by machining

Performing electrical discharge machining, unlike the first method for rough machining, it is difficult or impossible for the finishing grinding tool to leave the material processing part of the workpiece before the finishing EDM part, so that the large EDM is reduced and the EDM efficiency can be greatly improved.

If you are afraid of work troubles, direct EDM without rough machining will lead to extremely low EDM efficiency, which requires a correct understanding of the processing speed of EDM. In EDM, the removal of material is carried out through a microthermal melting process, which is much slower than mechanical cutting. For large cavities, even if rough machining is performed, if too much EDM machining allowance is left, the machining efficiency will be reduced.

2. Determine the process method according to the processing situation

The single EDM electrode is directly formed in the process to replace the multi-electrode forming process. When choosing a process, not only the processing speed should be considered, but also the processing accuracy and surface roughness should be carefully considered. The single electrode shape of the cavity is directly formed by a process that only has the required electrodes. For example, for a simple machining shape, the cavity accuracy is not required to be high, and repeated clamping operations are not required to directly form the spark processing efficiency. Sometimes, it is usually a higher processing requirement for a multi-stage process to process electrodes. First of all, rough machining, finishing and finishing a large amount of material with the electrode to ablate the electrode, and also consider the loss to compensate for switching to the electrode for finishing the multiple electrodes.

For example, in occasions that require high machining accuracy, only one electrode is used for machining. Due to the lack of understanding of the machining process, we hope to improve the machining efficiency by reducing the number of electrodes. However, in the actual machining process, because of rough machining, large electrical parameters cannot be selected, and the machining efficiency is extremely low. In another case, when the processing requirements are not high, multi-electrode processing is used, and the processing efficiency will inevitably decrease.

3. Reasonable selection of electrode materials

The selected electrode material is directly related to the discharge effect. To a large extent, the selection of the material determines the discharge speed, the final condition accuracy of the EDM and the surface roughness. The selection of electrode materials should be based on the actual needs of different types of mold processing. Copper and graphite electrodes are commonly used in EDM electrodes. Many mold companies rarely consider the size of electrodes used to select all the same electrode materials in the selection of electrode materials. This practice will affect the efficiency of EDM machining.

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What Is PTJ?
PTJ adopts flexible manufacturing methods to help our customers to control the product cost but best quality guranteed. Some frequently used machining processes include CNC milling, CNC turning, precision grinding, EDM machining, laser cutting, welding, CNC punching, sheet metal stamping, profile extrusion, die casting, forging, and more. Most of the custom precision cnc machining china parts and plastic machining components we made are related to automation machines, robotics, medical devices, fiber optics, aerospace/aircraft, test and measurement, sensors, telecom components, scientific devices, audio equipments, bicycles, boats, camera, cars, drones, electronic enclosures, front panels, furniture and architecture hardware, lighting, motorcycles, scooters, utv, jeeps, trucks, sports equipments, machinery, music instruments, and so on.
For Surface Finishes
Thanks to our mature supplier management and continuously experience accumulation. Now we have very stable surface finish suppliers to assist us to do different surface finishes with stable and excellent quality. Some Frequently used surface finishes are Anodizing, Oxide, Nickel Plating, Chrome Plating, Gold / Silver Plating, Powder Coating, Zinc Plating, PVD Coating, Passivation, Heat Treatment, Electrochemical machining, Brushing, Polishing, Sandblasting, etc.
General Tolerance of Equipments
1. CNC Milling tolerance: +/-0.01mm
2. CNC turning tolerance: +/-0.01mm
3. Precision grinding tolerance: +/-0.005mm
4. EDM machining tolerance: +/-0.005mm
How to Control Quality?
1. Inspection by machinist himself who is responsible for a specific part machining.
2. First article part inspection by QA.
3. IPQC patrol inspection during production.
4. PQC inspection before shipping according to ISO9001 sampling inspection standard for large quantity production. And for small quantity, 100% full inspection.
5. Material Certificates and outgoing inspection reports could be provided.
Our CNC machine and swiss machining shop sets full and advanced inspection instruments such as CMM, projector, height instrument, industrial microscope, micrometer, calipers, thread gauges, pin gauges, block gauges, etc. so as to inspect all details on drawings and confirm quality is good and issue the ourgoing reports accordingly.
How to Start Working with Our Company?
1) Sending detailed RFQ with 2D and 3D drawings to through email to info@pintejin.com. General drawing formats like PDF/ STEP/IGES/X_T etc are accepted.
2) We check and confirm about materials, surface finish and quantiy, and evaluate. If any question, our sales engineer would double check with customers until everything is clear. We will quote accordingly if we are ok to make the parts with best quality. If no question and everything is clear, we send quotation with best prices within 24 hours. Our sales engineer team is online for 7/24 for offering customers the best cnc machining services.
3) We recommend to start from few pcs prototypes for approval at the beginning. If nothing wrong after customer’s test and approval, then we proceed to volume cnc manufacturing.
Some Tips for Customers
a. We accept Paypal payment of small amount payment for samples or small batch orders for building mutual trust at the beginning. General payment terms is 30% by wire transfer, and balance before shipping.
b. Delivery time for few pcs samples are generally 5 to 7 days, and 15 to 25 days for volume production. If the order quantity was too big, we would check and confirm delivery time sepertely.
c. Our company has concrete promise to all customers that if any quality problem caused by our factory, we would remake all parts for free or send money back.
Safe Packing Methods to Prevent Goods from Damage during Transportation
Due to long distance transportation to overseas countries, safe and strong packing is very important to gurantee the parts to be in good conditions when arriving at customer’s hand. We choose different packing materials according to different parts and quantity. Some commonly used packing materials are pp/bubble bag, oil paper, foam, blister tray, 5 layer carton, wood box, etc. See below some packing pictures.