注塑机机械系统的设计英文文献和中文翻译(5)
Long-range nozzle: it besides is equipped with heating circle, also enlarged the nozzle material stock room, in order to prevent the liquid cooling. This form of nozzle diameter smaller, range far, is suitable for the thin wall products with complex shape.
Here mainly use straight through, not detail self-locking type.
4.3 oil cylinder
A single cylinder injection molding injection device, the fixed oil motor oil cylinder back cover and with seals of the rubber piston respectively with injection oil cylinder, transmission shaft and the shaft and the screw connection form inside the cylinder, shot by bearing on both ends of the rubber piston, described in the bearing connection on the drive shaft, shaft described by power input shaft and the oil motor connected into a whole, described in the input shaft with one end of the transmission shaft and power and mobile in the injection cylinder. The piston rod is omitted, simple structure, less parts. Plasticizing, injection process, the shaft have left and right in the injection cylinder move, rotate and spline shaft, won't be stretched out to the outside of the injection cylinder, so the length of the cantilever end will not change, stable rotation, force uniform, which can realize high speed injection, is appropriate in different stroke and the size of the injection molding machine, has strong applicability and wide use range.
4.4 the plunger rod
A from funnel is used to control the flow of molten steel flow in the plunger rod, the part contain in the plunger rod internal channel metal components of carrier vehicle components described oppression under the lateral expansion of part of the frustum of a cone surface and channel the plunger rod of complementary between the surface of the sealing device, transverse components in the carrier of the expanding part of the position of the above with carrier components and piston rod body in a thread insert of meshing, and the other of the sealing device between mentioned carrier inserted parts and components. Is preferred, insert a downward spiral twist to the oppression and the seal gasket on the nut.
5. Clamping device
Clamping device type selection, directly affects the performance and cost of the machine. However, hydraulic and toggle strengths, and their respective characteristics will change with the change of the specific situation. So, the choice of the convolution model type has been the concern of the mechanical designers.
The influence of moulding form dimension precision of products
Dimensional accuracy of products is reflects one of the important indexes of molding products quality fit and unfit quality, decided to the size precision of injection products should not only consider the mould clamping force in the name of the machine, but also noticed after injection of various membrane device due to the system just line rigidity, reflected different springback behavior. In the same mould clamping force and the process conditions of similar conditions, product size accuracy to a great extent, depends on the rigid clamping device. As a general rule, toggle clamping device rigidity than hydraulic. The effect of the rigid size dimension precision of products, especially in the overload machine (i.e. injection, the actual clamping pressure or products of the projection area of more than design value), the performance is more outstanding. When hydraulic is not only of the same nature and toggle lever elongation deformation, as well as additional overload work part of the convolution model oil cylinder oil compression deformation, etc. According to the experimental data, the clamping force of 160 tons of force on the two kinds of clamping device of processing the same mold, and work in the case of overloading 10%, found on the toggle processing mold does not appear crack, and straight cracks in the pressure type has produced 0.47 mm.
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