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Have all the operating procedures of the injection molding workshop been achieved?

               Start-up preparation
1. Make preparations before production.
2. Turn on the heating switch to heat up. Check whether the heating coil is working normally, and solve it in time if there are special circumstances or find relevant personnel to solve it.
3. Turn on the cooling water to prevent the high temperature in the latter part of the heating process from forming plastic backflow, which will block the feeding port and delay the normal start-up. And whether the cooling water pump is abnormal, whether the sound is normal, if there is any problem, solve it in time or find relevant personnel to solve it.
4. Before starting the machine, check whether the electrical appliances and mechanical safety devices of the machine are reliable. If there is any problem, fix it in time or find relevant personnel to solve it.
5. Check whether the fastening screws of the mold and the machine are loose, and whether the guide post and the guide sleeve are correctly inserted. If there is any problem, solve it in time to avoid unnecessary accidents or damage to the mold. Enter the corresponding injection molding benchmark process conditions according to the product name.

              Forming adjustment
1. Open the plastic machining mold and check whether there are foreign objects on the parting surface of the mold. If there are foreign objects, remove them in time to ensure that the parting surface is clean, so as not to crush or damage the mold and affect the accuracy of the mold.
2. When cleaning the plastic or impurities on the mold cavity or core, it is strictly forbidden to impact the mold cavity and core with iron or other hard metals to avoid damage to the mold.
3. Lubricate the guide post, guide sleeve and other sliding parts of the mold.
4. When the temperature of the barrel is reached, keep it warm for another 5 minutes to ensure that the plastic in the barrel is fully melted, and the machining uhmw plastic cannot be forced to start or predict, so as not to damage the screw and the inner wall of the barrel.
5. Without clamping the mold, it is strictly forbidden to advance the injection seat to avoid damage to the mold or accidental injury caused by the falling mold. Formal production
6. After the machine is turned on, the person in charge will take the first 5 molded products and confirm the first piece. The confirmation result is recorded in the "First Article Inspection Record Form". And notify the engineering inspector that the equipment has entered the production state.
7. After entering the formal production, record the actual production process conditions in the "Injection Molding Process Record Sheet".
8. During production, the personnel in charge need to clean the cnc machined parts molds and machines and update the grease every shift.
9. Temporary shutdown due to alarm or other reasons. When re-production, the first 2 molds should be discarded, and then 2 molds should be taken to confirm the appearance of the molded product.
                   shutdown
1. After the production reaches the production instruction quantity, close the hopper inlet and switch the molding machine to the "semi-automatic" state.
2. After cleaning the mold a little, spray anti-rust agent on the PL surface of the mold.
3. Turn off the mold cooling water 5-10 minutes before shutdown, and blow out the mold cooling water after shutdown.
4. Take out the excess material in the hopper, and clean up the part that cannot be taken out.
5. Clean the screw. If machining uhmw, PP, PE, PS, ABS raw materials, there is no need to clean the screw; to produce other raw materials (such as PVC material), you need to clean the screw with cleaning materials.
6. Screw cleaning method. After the production of PVC.POM raw materials, they are directly cleaned with cleaning materials. After PC and PA raw materials are produced, they are cleaned with cleaning materials first, and then the temperature of the barrel is lowered to 200 degrees, and then cleaned several times.
7. After the screw is cleaned, shoot the screw to the end.
8. At the end of production, the mold should be closed, but the mold should not be closed tightly, so that the movable and fixed molds should maintain a gap of 0.5-1mm.

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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.