BÁO CÁO THIẾT KẾ CHẾ TẠO KHUÔN MẪU ĐỦ 25 BÀI_SPKT-17-EN

TOPIC: SYSTEM REMOVING UNDERCUT GVHD: TRẦN MINH THẾ UYÊN SVTH: NGUYỄN HOÀNG LINH MSV: 12144060 CONTENTS PRESENTATION INTRODUCE UNDERCUT OUTSIDE UNDERCUT INSIDE UNDERCUT REN TRONG UNDERCUT REN NGOÀI TYPICAL UNDERCUT UNDERCUT OUTSIDE SYSTEM COMPONENTS BASIC PARAMETERS OF CORE SLIDING BOLTS SLIDING CALCULATION OF DATA - traction: During the injection molding and cooling, the plastic bag outside the core and volume contraction To disconnect power to win shrinkage and friction F = Pacos (f - tanα) / (1 + f sinα1 cosα1) The angle of the oblique α key: The magnitude of the oblique tilt latches not only involves bending force closing of oblique and traction achieved, but also connected with work of key length skewers, slip and trip distance open mold The angle α is usually chosen in the range of 12 ÷ 25 ° - Distance slider: Pull the core out of the mold to the position where no human influence push The distance moved is called the slip distance Usually, common, normal creepage distances are measured by the depth of the hole should add about securely usually ÷ mm S = H tan α + (2 ÷ 3) Q: What is the open mold itinerary requested by closing the gap to complete oblique slide (mm) A: The closing angle of oblique S: distance slide (mm) - The diameter of the bottom oblique The calculation formula for ending diagonal diameter can be deduced from the mechanical material: d = (Fb × L / 0.1 [σb] cos α) 1/3 Inside: - Α: the angle of the oblique key - Fb: bending force of closing the oblique (N) - [Σb]: bending stress, usually 140 MPa for carbon steel - Calculation of key length skewers The length of the key workrelated slant L itinerary drawn S core, the key oblique angle α and β the angle formed by sliding and parting lines Β normal value is L1 + L2 + L = L3 + L4 + L5 = D2 / mt α + h / cos α + d / mt α + s / sine α + (5 ÷ 10) UNDERCUT INSIDE BOLDS BASIC PARAMETERS SLIDING OF BOLTS CORE DESIGN OBLIQUE The shallow concave surface of plastic products require small gap withdraw core, while the concave area big, big draw core need So closing the oblique structure is added to the side and core products withdrawn Push key thrust of the motion controller's tilt latch oblique slip Inclined surface and core of the product withdrawal is completed by closing the vertical oblique thrust and remove the plate HYDRAULIC CYLINDER PUSH UNDERCUT BY REMOVING PRINCIPLES CYLINDER HỆ THỐNG REN TRONG CÁC BƯỚC THÁO REN REN NGOÀI PRINCIPLE OF OPERATION [...]... involves bending force closing of oblique and traction achieved, but also connected with work of key length skewers, slip and trip distance open mold The angle α is usually chosen in the range of 12 ÷ 25 ° 3 - Distance slider: Pull the core out of the mold to the position where no human influence push The distance moved is called the slip distance Usually, common, normal creepage distances are measured