Sewer manhole cover mold, Heze manhole cover mold, Precision Mold

 Shrinkage factor S represented by the formula: S = {(DM) / D} × 100% (1) wherein: S- shrinkage; D- mold dimensions; M- plastics dimension. If the mold cavity is calculated according to the known size of plastic parts and material shrinkage compared with D = M / (1-S) in the mold design in order to simplify the calculation, the general mold dimensions using the following equation: D = M + MS (2) If you need to implement a more accurate calculation of manhole cover mold, apply the following formula: D = M + MS + MS2 (3) However, in determining the shrinkage due to actual shrinkage is affected by many factors and can only use the approximation iron manhole cover mold, thus using equation (2) to calculate the size of the cavity basically meet the requirements. In the manufacture of the mold, the cavity is processed according to the following error, press the deviation core processing, can be used to facilitate the appropriate dressing when necessary. . Line position Points 1. General powered by Bevel column composite manhole cover mold, a relatively small core pulling away with a T-shaped slot, with more than 30mm core pulling cylinder. 2. The angle pin angle smaller than shovel angle of 2-3 degrees. 3. After the mold line position than the total height of the mold into the front half of the machine can dispense with the shovel, the use of pre-machined surface mold for pressing. 4. Line-bit width is greater than 100mm, try to use two Bevel column, plus more than 150mm in the middle of the guide groove. 5. Line Bit position: do not try to Boyjazz marbles (force is not big enough), with a screw positioning. 6. line position is located at the TOP, be sure to put the spring, otherwise OK place finish memes gravity, can not lead to crashing homing. 7. mold opening direction of the projector, such as the bottom line bit slant or thimble, to set the first reset mechanism, or they may line position and the lifter or thimble cause interference. 8. line position with walking, go to beer, bits of plastic manhole cover mold plastic bag, straight body out. 9. OK button should be greater than the travel position 2 to 3mm, cylinder stroke buckle bit should be greater than 10mm. 10. In order to increase the robustness of the shovel machine, try to do the backhoe. Sewer manhole cover mold, Heze manhole cover mold, precision mold from Hebei fine of up to mold machinery factory provided. Hebei Jing Mould Machinery Factory (www.dzsmj.com) strong, credible, in Baoding plastic industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the precision molds and you work up into the brilliant, for a better future!