Jun 17, 2019
01 Common plastic engineering materials and shrinkage? ABS:0.5%(super glue free) PC :0.5% (bulletproof glass glue) PMMa:0.5% : (plexiglass) PE: 2% polyethylene PS:0.5%(polyphenylethylene) Pp :2%(100% flexible adhesive) PA: 2% (nylon) PVC: 2% (polyvinyl chloride) POM: 2% (steel) ABS + PC: 0.4% PC + ABS: 0.5% Engineering materials: ABS PC PE POM PMMA PP PPO PS PET 02 What are the major systems of the mold? Casting → ejecting → cooling → molding → exhaust 03 What problems should be paid attention to in the process of mold design? (1) the wall thickness should be uniform as far as possible, and the stripping slope should be large enough. (2) the transition part shall be gradual, smooth and avoid sharp corners. (3) gate.The runner should be as wide and short as possible, and the gate position should be set according to the contraction and condensation process. (4) the surface of the mold should be clean and smooth with low roughness (0.8 is the best). (5) vent holes and slots must be adequate to expel air and gases from the melt. (6) except PET, the wall thickness should not be too thin, generally not less than 1mm. 04 Lump of plastic often occurs? Lack of glue → mantle → bubble → shrinkage → weld mark → black dot → striation → warping → layering → peeling 05 Common plastic mold steel? 45# S50c 718 738 718H 738H P20 2316 8407 H13 NAK80 NAK55 S136 S136H SKD61 06 What kind of material is used for high mirror finish? Commonly used high hard heat treatment steel, such as: SKD61, 8407, S136 07 What are the structures of the formwork? Panel →A plate →B plate → square iron → guide post → thimble plate → thimble fixing plate → bottom plate 08 What are the basic forms of the parting surface? Flatness → inclination → curved surface → perpendicular → cambered surface 09 How do you hide each other in UG? CtrL + B or ctrL + shift + B 10 What are the mould processing machinery and equipment? Computer gong lathe milling machine grinder drilling machine. 11 What is 2D and what is 3D? D Dimension, 2D refers to the two-dimensional plane, 3D refers to the three-dimensional space, in the mold section, 2D usually refers to the plane drawing (CAD drawing), and 3D usually refers to the three-dimensional drawing. 12 What is the default accuracy of pro/e?What is the UG default accuracy? The default accuracy of pro/e is 0.0012MM and UG is 0.0254MM. 13 Global mold frame production four strong enterprises? Germany: HASCO Japan: FUTABA us: DME China: LKM (dragon) 14 What is the default word height for CAD? The default CAD word height is 2.5mm. 15 What is impingement? What is impingement? The mating surface of male and female dies parallel to the PL surface is called the penetrating surface, and the mating surface uneven to the PL surface is called the inserting surface. 16 The relationship between strips and silk Both strips and silk are length units, and the strips are used in Taiwan language, 1 strand =0.01MM, while the silk is used in Hong Kong language, 1 strand =0.01MM, so 1...
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