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Which parts are more suitable for precision parts processing?

 We know that precision parts processing requires high precision. Precision parts have good rigidity, high manufacturing precision, and precise tool setting. Therefore, parts with high precision requirements can be processed. So which parts are suitable for precision machining?

First of all, compared with ordinary lathes, CNC lathes have the function of constant linear speed cutting. Both the end face and the outer circle of different diameters can be processed at the same linear speed, which ensures that the surface roughness value is consistent and relatively small . The ordinary lathe has a constant speed, and the cutting speed is different with different diameters. When the material of the workpiece and the tool, the finishing allowance and the tool angle are certain, the surface roughness depends on the cutting speed and feed rate.

When processing surfaces with different surface roughness, choose a small feed speed for a surface with a small roughness, and a larger feed speed for a surface with a large roughness. The variability is very good, which is difficult to achieve on ordinary lathes. Parts with complex contour shapes. Any plane curve can be approximated by a straight line or a circular arc. CNC precision machining has circular interpolation function and can process a variety of complex contour parts. The use of cnc precision machining requires careful use of the operator.

CNC precision machining mainly includes fine turning, fine boring, fine milling, fine grinding and grinding processes:

  • (1) Fine turning and fine boring: Most of the precision light alloy (aluminum or magnesium alloy, etc.) parts of aircraft are processed by this method. Generally, natural single crystal diamond tools are used, and the radius of the blade arc is less than 0.1 microns. Machining on a high-precision lathe can obtain an accuracy of 1 micron and a surface unevenness with an average height difference of less than 0.2 microns, and the coordinate accuracy can reach ±2 microns.
  • (2) Fine milling: used to process aluminum or beryllium alloy structural parts with complex shapes. Rely on the accuracy of the machine tool's guide rail and spindle to obtain a higher mutual position accuracy. High-speed milling using a carefully ground diamond head can obtain a precise mirror surface.
  • (3) Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel, which has high hardness. Most high-precision grinding machine spindles use hydrostatic or dynamic pressure liquid bearings to ensure high stability. The ultimate accuracy of grinding is not only affected by the rigidity of the machine tool spindle and bed, but also related to factors such as the selection and balance of the grinding wheel and the machining accuracy of the center hole of the workpiece. Fine grinding can obtain a dimensional accuracy of 1 micron and an out-of-roundness of 0.5 micron.
  • (4) Grinding: Use the principle of mutual research of mating parts to selectively process irregular convex parts on the processed surface. Abrasive particle diameter, cutting force and cutting heat can be precisely controlled, so it is a high precision machining method in precision machining technology. The hydraulic or pneumatic matching parts of the precision servo components of the aircraft, and the bearing parts of the dynamic pressure gyro motor are processed in this way to achieve an accuracy of 0.1 or even 0.01 microns and a microscopic unevenness of 0.005 microns.

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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.