There are three reasons for the quality of EDM

EDM is a processing tool. However, during the processing process, some other factors may cause problems in all aspects of the processed material, and it cannot be fast.

If the speed is fast, it may cause the loss of the electrode or increase the roughness. What are the factors that affect the quality of EDM?

Factors affecting the surface quality of electric sparks

1. Microhardness and wear resistance of EDM

The hard surface layer is usually higher than for some hardened steels and may be slightly lower than the hardness of the matrix

It is used for rolling friction. Due to the alternating load, especially dry friction, the wear is caused by the weakening of the melting and solidification layer and the basic combination, which is easy to peel off. Therefore, some demanding molds need to be processed after grinding the surface deterioration layer.

2. Residual stress in EDM machining

Surface residual stress exists, most of the tensile stress and the distribution of residual stress, as well as the state of the main material before the heat treatment and pulse energy treatment, and therefore the performance, higher quality requirements of the workpiece For the surface layer, avoid using too much treatment

3.the fatigue resistance of EDM

The surface has great tensile stress and may have micro cracks. The fatigue strength of the surface is many times lower than that of the machined surface. Tempering treatment, shot peening, etc. help reduce residual stress or convert residual tensile stress into compressive stress, thereby improving its fatigue resistance.

PTJ RFQ

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.

Thursday, December 31, 2020