Abstract: The plastic pallet has complex structure and huge volume, which makes it more difficult to design the mold gating system. It is difficult to master the gating system only by the experience of mold engineers.
Rationality of unified design. Therefore, with the help of Moldflow software, the plastic pallet gating system is simulated and analyzed, and the number, position and position of gates are optimized.
Runner size, etc. To achieve the balance of runner, reduce the related defects such as volume shrinkage of molded pallet products, and finally establish the best gating system design scheme for improvement.
The success rate of one mold trial.
Keywords: tray; Moldflow software; Pouring system; Visual design
Preface of 0
Pallet is an important container in the field of logistics.
Developed to adapt to mechanized loading and unloading. Due to the performance of the plastic tray
The requirements are higher, and correspondingly higher requirements are put forward for its design and manufacture.
Beg. Because of the complex structure of large pallet mould, the manufacturing cost and output are high.
Long cycle and certain risks, mainly imported by foreign professional mold manufacturers.
Design and manufacture, and CAE is widely used in mold design.
Technology.
1 Pouring system for plastic pallet mold
Because the flow rate ratio (L/t) of plastic fluid in large molds is large,
Therefore, whether the gating system design is reasonable or not will directly affect the melting of plastics.
Main body pressure and temperature loss, process, pressure maintenance and supply, product residue and welding.
Marks, internal stress and many other aspects will also affect the internal and external quality of products.
Quantity and the rigidity and strength of the mold. So the gating system often becomes
The main object of priority for large injection molds. In the gating system,
Mainly to optimize the number and position of [1] gates and the sizes of main and branch channels,
Other aspects of shape and design.
1. 1 Establish the finite element model.
According to the three-dimensional solid model (as shown in figure 1), the finite element model is established.
The grid type is two-level model [2], and the grid is carried out in Moldflow.
Automatic segmentation. After segmentation, the grid will be repaired accordingly, and the obtained
The grid model of is shown in Figure 2, which contains 5 204 nodes and 10 568.
The mesh matching rate reaches 9 1%, and the mesh quality of the model is very good.
1.2 gating system design scheme
The gating system is the channel through which the melt enters the mold cavity from the nozzle of the injection machine.
Tao. Its position, size and shape will directly affect the internal quality of plastic parts.
And appearance quality. If the design is improper, it will easily lead to poor filling and poor welding.
Mark, cavitation, deformation, uneven density, excessive internal stress and even filling.
Disadvantages.
According to the structural characteristics of pallets and the experience of enterprise mold engineers,
There are three schemes for gating system design [3-4], as shown in Figure 3. With the help of mold flow
Software Moldflow is used to simulate filling [5] and study the best design.
Scheme.
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