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china latest news about Shape and position tolerances questions and answers

Shape and position tolerances questions and answers

November 14, 2023

41．What areas of special attention need to be paid attention to when adopting the maximum entity requirement? A: the deviation of the datum element is considered based on its external acting size rather than the deviation of the actual size from the control boundary. If the measured element is a ...
china latest news about Shape and position tolerances questions and answers

Shape and position tolerances questions and answers

November 13, 2023

31. What is the definition of symmetry tolerance zone? A: the tolerance zone is the area between two parallel planes (or straight lines) whose distance is the tolerance value t and which are symmetrically arranged relative to the datum center plane (or center line or axis). If two directions that ...
china latest news about Shape and position tolerances questions and answers

Shape and position tolerances questions and answers

November 8, 2023

1. What are the main contents of the national standards for shape and position tolerances? A: There is GB/T1182-96 General principles, definitions, symbols and graphic representations of shape and position tolerances. GB/T4249-96 Tolerance principles. GB/T13319-03 Geometric Tolerances Positional ...
china latest news about Shape and position tolerances questions and answers

Shape and position tolerances questions and answers

November 9, 2023

11． What are datum features? A: an actual feature (such as an edge, a surface, or a hole) on a part that is used to establish a datum and actually serves as a datum. 12. How are the measured elements represented on the drawing? A: the measured elements are generally connected to the geometric ...
china latest news about Shape and position tolerances questions and answers

Shape and position tolerances questions and answers

November 10, 2023

21. What is the definition of flatness tolerance zone? A: the tolerance zone is the area between two parallel planes whose distance is the tolerance value t. 22. What is the definition of roundness tolerance zone? A: the tolerance zone is the area between two concentric circles on the same normal ...
china latest news about PC, ABS, HIPS, PP, PS, PVC, POM, EVA, PA6, PA66, PMMA, HDPE, LDPE, GPPS shrinkage

PC, ABS, HIPS, PP, PS, PVC, POM, EVA, PA6, PA66, PMMA, HDPE, LDPE, GPPS shrinkage

November 7, 2023

What is shrinkage? Shrinkage is also called shrinkage. The shrinkage of plastic materials refers to the percentage difference between the size of the plastic material product at the molding temperature and the size after it is removed from the mold and cooled to room temperature. It reflects the ...
china latest news about Stress testing methods for plastic materials such as PA(nylon), ABS, PC, PMMA, POM, PE etc

Stress testing methods for plastic materials such as PA(nylon), ABS, PC, PMMA, POM, PE etc

November 6, 2023

1. PA (nylon): 8026 upper cover, 532 support body, 049D inner core, etc ① The original color is milky white, slightly brown, burns slowly, and extinguishes slowly after leaving the fire. The flame is yellow at the top and blue at the bottom. It melts, drips, and bubbles, and has a special smell of ...
china latest news about Common materials introduction

Common materials introduction

November 3, 2023

Low carbon steel The carbon content of steel is ≤0.25%. Due to the low carbon content, the strength is low, the hardness is low, but the plasticity and toughness are high, and the forgedness and weldability are good. Generally uses heat treatment to create small and medium sized mechanical parts and ...
china latest news about PC features, advantages, disadvantages and uses

PC features, advantages, disadvantages and uses

November 2, 2023

Feature A non-crystalline thermoplastic Advantages 1. It has high strength and elasticity coefficient, high impact strength and wide operating temperature range. 2. High transparency and free dyeing 3. H.D.T. high 4. Good fatigue resistance 5. Good weather resistance 6. Excellent electrical ...
china latest news about Properties, uses and differences between copper, brass, bronze and white copper

Properties, uses and differences between copper, brass, bronze and white copper

November 1, 2023

Pure copper is a purple-red metal, commonly known as red copper, red copper or red copper. Pure copper is highly malleable. Pure copper the size of a drop of water can be stretched into filaments up to two kilometers long, or rolled into almost transparent foils larger than a bed. The most valuable ...
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