Advantages: Beilun pig iron sheet metal Ningbo and cast iron plastic platform where can I sell Beilun pig iron sheet metal Ningbo and cast iron plastic platform where can I sell Beilun pig iron sheet metal Ningbo and cast iron plastic platform? 0? The development of blow molding industry requires the design and manufacture of blow molding dies with fast cycle and long service life. The factors that determine the efficiency of the mold are: l) material; 2) cooling; 3) Design of the blanking port; 4) Exhaust. The material used to make the mold must have high thermal conductivity and sufficient cutting edge strength. At present, aluminum 70/75 is an advanced alloy for manufacturing most molds. Because this metal has good machinability, the mold cavity is usually machined. The copper alloy mold also has high heat transfer and good corrosion resistance. Obviously, the simplified program of flatness data processing and the accuracy of its error value are related to the wiring layout and error during verification. In the flatness verification of plane working face, it is very important to arrange wiring points reasonably, which will help to improve the verification accuracy and simplify the complexity of data processing. Selection principle of cast iron flat bridge deck The choice of bridge deck form should be adapted to the shape of the measured surface. When measuring the plane, in principle, two bridge decks with flat bearing surfaces are generally adopted. The bearing surface should not be too wide, and the two bearing surfaces should be in the same plane. When measuring the V-shaped surface, the two bearing surfaces should be V-shaped. It must be noted that only two bearing surfaces of the bridge deck are allowed to contact with the measured surface, otherwise the position of the measuring point and the span of the bridge deck cannot be determined. Trilateral mutual research method Trilateral mutual research method refers to three flat plates with the same size, which are painted and dragged alternately for testing. If the contact black spots revealed by three mutual studies are good, it is considered that the flatness of the three plates has been guaranteed, which is a method for checking the contact black spots. Trilateral mutual research method is a traditional inspection method, which has been used to control local flatness for many years. Trilateral mutual research method is feasible in ensuring the accuracy of flat plate for the following reasons. Verification accuracy 1, unknown flat plate is the basis of product geometric accuracy, and trilateral mutual research method is beneficial to ensure and improve the accuracy of flat plate. 2. It is correct in theory to directly verify the flatness of flat plate with level or autocollimator, but there are many factors that affect the verification accuracy and are prone to errors. This limited number of points verification method can not truly reflect the flatness error of the whole block. Trilateral mutual check method is more intuitive and reliable. The method of trilateral mutual research has been used for many years. Although the operation is complicated, the factory is used to joint research and inspection of small plates in this way.