What are the acceptance criteria of the mold in the molding and injection molding process


After the mold is made, it shall be checked and accepte […]

After the mold is made, it shall be checked and accepted one by one according to the standard requirements, and the acceptance record shall be made.
Molding part, parting surface, exhaust groove
There should be no unevenness, pits, rust and other defects affecting the appearance of the front and back mold surfaces.
The insert is matched with the mold frame, and there should be a clearance of less than 1 mm around the round corners.
The parting surface is kept clean and tidy, there is no portable grinding wheel to avoid cavities, and the sealing part has no dents.
The depth of the exhaust groove should be less than the overflow value of the plastic.
The inserts should be in place, smoothly placed and reliable in positioning.
The inserts, inserts, etc. should be reliably positioned and fixed, the round pieces should be prevented from rotating, and no copper or iron sheets should be placed under the inserts.
The end face of the ejector rod is consistent with the core.
The forming part of the front and rear molds has no defects such as undercuts and chamfers.
The ribs should be pushed out smoothly.
For multi-cavity mold products, the left and right parts are symmetrical, and L or R should be indicated. If the customer has requirements for position and size, it should meet customer requirements. Generally, add it where it does not affect the appearance and assembly, and the font size is 1/8.
The clamping surface of the mold base should be in place, and more than 75% of the area should be touched.
The ejector rods should be arranged closer to the side walls and beside the ribs and bosses, and larger ejector rods should be used.
The numbers 1, 2, 3, etc. should be indicated for the same parts.
Each contact surface, penetration surface, and parting surface should be researched and matched in place.
The parting surface sealing part should meet the design standard. 10-20 mm for medium-sized molds, 30-50 mm for large molds, and the remaining parts are machined to avoid voids.
The skin texture and sandblasting should meet customer requirements evenly.
For products that require appearance, the screws on the products should have shrink-proof measures.
Jack pipes should be used for screw columns with a depth of more than 20 mm.
The wall thickness of the product should be uniform, and the deviation should be controlled below ±0.15 mm.
The width of the ribs should be less than 60% of the wall thickness of the exterior surface
The core inserts on the inclined roof and the slider should have a reliable fixing method.
The front mold is inserted into the rear mold or the rear mold is inserted into the front mold, and the surrounding area should be locked with a bevel and machined to avoid air.
Injection molding production process
The mold should have the stability of injection molding production and the repeatability of process parameter adjustment within the range of normal injection molding process conditions.
The injection pressure during mold injection production should generally be less than 85% of the injection molding machine's rated maximum injection pressure.
When the injection speed of the mold is produced, the injection speed of the three-quarter stroke is not less than 10% of the rated maximum injection speed or more than 90% of the rated maximum injection speed.
The holding pressure of mold injection molding should generally be less than 85% of the actual maximum injection pressure.
The clamping force during mold injection production should be less than 90% of the rated clamping force of the applicable model.
During the injection molding production process, the product and the nozzle material should be taken out easily and safely (the time generally does not exceed 2 seconds each).
For molds with inserts, the inserts are easy to install and the inserts are fixed reliably during production.