BÁO CÁO THIẾT KẾ CHẾ TẠO KHUÔN MẪU ĐỦ 25 BÀI_SPKT-3-EN

OTHER NOTICES GEOMETRIC SHAPES OF PRODUCTS 1) Corner exit mold - As well as the outer surface of the product must have certain taper towards the open mold - In the short mold core or cavity shallow (less than mm) cone angle of about 0.25 ° at least each side Cavity and core depth increased from to inches (25.4 ÷ 50.8 mm) cone angle should increase to ° per side When not designing drainage angle or improperly designed mold, the product will be trapped in the mold or if the matter ejected in the product surface will also fail - Graphs choose beveled corner: - The formula for calculating the beveled corner: 2) Thickness a) Effective design: - Shortening the cycle time of injection molding and mold making - Avoids errors on the product - Increasing time filling shorten cycle time injection molding and mold making - Reduce the cost of products and mold - Material savings while bringing efficiency - Avoid defects such as warping, stomatal - Product thickness directly affects not only the stiffness, electrical insulation, heat resistance First, while increasing the thickness of the cold cycle time increases Second, section too thick will create an empty bladder, airbags and dents The best heat transfer when products have uniform thickness to minimize warping b) Some things to note - The thickness of the product is made as thin as possible as possible, as evenly as possible If the product is not strong enough, you can: + Increased thickness + Using other materials have higher durability + Create stiffening ribs or the glide angle for increased reliability + Can restricting disabilities by designing the transition 3) Corner a) The effect of design: - Reduce stress concentration - Assist products are cooled more evenly - Reduce the possibility of warping - Reduce the flow obstructing makes plastic fills the cavity better b) Solution design bo corner: DOCSIS requirements thickness uniformity of products Avoiding product design with geometric shapes asymmetrical c) Some caution when designing motherboards corner: The radius of the boron should range from 0.25 to 0.6 Recipe: R = r + T - The disabled often encounter: 4) Tendon a) Effective design: - Increasing product durability - Increased resistance to bending of the product b) Design Nearby: - Designed so that tendon thickness as thin as possible products - The geometry increases tendon strength: thickness, elevation, taper angles are related to each other Nearby inclination of each side about 10 - The reference parameters when designing Nearby: Ribbed reinforcing the flat plate bending: t = (0.5-0.8) T h ≤ 3T r = (0.25-0.5) T Φ = (0.5-1) ° S ≥ 2T Ribbed reinforcing the corner plates A = (0.5-0.7) T B ≥ 2T C ≥ 2T D ≥ 2T c) a few things to note: The thickness of the tendon should not exceed half the thickness set tendon The thickness of the tendon should not exceed half the thickness set tendon The ribs should be designed in parallel, the distance between the tendon should be at least equal to times the thickness The ribs should be placed along one direction to achieve good rigidity Can replace corrugated folds to increase the rigidity and aesthetics place transition should be a point to ensure the hardness and resistance to stress for the product Ribbed reinforcing: for stiffening the corners, sides, lugs protruding 5) Convex - Lugs protruding on products used to screw or latch combined with holes in the assembly process Thickness smaller lugs protruding thickness 0.7 times the distance between the two put the paw paw twice bigger product thickness Transitional outer radius should equal 0.25% thickness or at least put the lug by 0.4 mm to reduce stress - The outer cone angle at the side should be a minimum of 0.50 and smallest cone angle so as to ensure the drainage 00:25 mold The lugs protruding put away the product design should add stiffening ribs Make a right foot concave ring lugs to avoid the concentration of material 6) Loss on products a) Loss not transparent: - The depth of the hole should not exceed times the diameter - A good design is the thickness of the hole is always equal and no sharp corners b) hole through: - The distance between two holes or between the hole and the outer edge should be equal to twice the thickness or twice the maximum size is measured the circumference of the hole - When the distance between the holes are too small or complex affecting the casting process can change the design for a better fit 7) Product Design threaded a) Minutes lace shape: Thread on the plastic parts manufactured by means of injection molding Deformation threaded sometimes designed not follow any standards Thread round profiles are also often used on plastic parts b) The note at foot lace design: Foot radius lace and lace to the largest peak can to reduce stress All lace segment should create a smooth passage to avoid damage resulting lace lace smuggled in during use -You Can use rubber gaskets for joints to be sealed over • Do not designed lace with less than mm steps (32 thread / inch) 8) UnderCut -Undercut Are detailed, textured on products that have different directions stripping with stripping direction of the product Is the top product -Undercut caused difficulty parting -Undercut May be located outside or inside the product The note when designing undercut: - Avoid too complex undercut design - Thickness no greater than 0.7 times undercut the thickness of the product at the place set undercut - The edges of the mold containing boron should undercut the supply and inclined to undercut can easily escape - Part undercut when removing them should be hot enough to be able to stretch and return normal back then [...]... distance between the two put the paw paw twice bigger product thickness Transitional outer radius should equal 0 .25% thickness or at least put the lug by 0.4 mm to reduce stress - The outer cone angle at the side should be a minimum of 0.50 and smallest cone angle so as to ensure the drainage 00 :25 mold The lugs protruding put away the product design should add stiffening ribs Make a right foot concave... taper angles are related to each other Nearby inclination of each side about 10 - The reference parameters when designing Nearby: Ribbed reinforcing the flat plate bending: t = (0.5-0.8) T h ≤ 3T r = (0 .25- 0.5) T Φ = (0.5-1) ° S ≥ 2T Ribbed reinforcing the corner plates A = (0.5-0.7) T B ≥ 2T C ≥ 2T D ≥ 2T c) a few things to note: The thickness of the tendon should not exceed half the thickness set tendon