Study On Forming And Key Technology Of New UHMWPE Piston Pump

The design theme is based on the emerging high quality and high performance organic material UHMWPE(UHMWPE),making full use of the advantages of materials,committed to developing a light environmental protection,wear resistance and corrosion resistance,low noise and no leakage of high performance-price ratio pump.To meet the transportation needs of some complex media.Ultra high molecular weight polyethylene(UHMWPE)is a kind of high performance engineering plastic.It is a kind of high-performance engineering plastic.It is non-toxic and has many mechanical properties.At the same time,it is only 1 / 8 of the mass of iron,and it has super-strong resistance to almost all chemical corrosion.Take it as the material to develop the new type pump product,may solve has the special request the medium transportation difficult problem.However,due to the difficulties of UHMWPE processing,it has not been widely used.In this paper,the structural innovation and molding methods of the pump are studied.The new UHMWPE piston pump adopts electromagnetic force to provide driving force,which can realize the transmission of power between air and air,eliminating the power transmission mechanism,simplifying the structure,and avoiding the leakage problem faced by the dynamic seal.Although the power provided by a single magnet has an upper limit,according to the force acting on the piston,it is possible to provide multiple power by increasing the number of magnets in the piston and the number of matching coils,that is,equivalent to multiple piston pumps in series.The flow rate can be increased when a plurality of piston pumps are connected in parallel.The pump units in series or in parallel can work independently and synchronously,and the system will not stop working because of the obstacle of one unit.The whole system can adjust its control frequency through the control system so as to achieve stepless control of the flow to adapt to the different flow requirements in the work.In this paper,the fragile piston sealing ring is simulated and analyzed by finite element software,and its structure is properly optimized.The difficulty of manufacturing new type UHMWPE piston pump lies in the production of pump body blank.Because of the difficulty of UHMWPE forming and the special processing method,this design adopts the more reliable pressing and sintering forming method to make the blank,and the molding process is clean and environmental.It is much lower than the energy consumption of the same kind of products.Because the pressed sintered UHMWPE has a high surface quality,the design size of the mold core is obtained through the calculation and analysis of the mold structure,and the precision molding is carried out through the mold.The inner hole of the compacted and sintered blank has higher dimensional accuracy and quality,thus the secondary machining is avoided.Because of the low thermal conductivity of the material,the temperature of the whole process is difficult to be grasped,so the temperature change during the preheating,heating and cooling of the sintering molding process is simulated and analyzed with the help of the finite element software.And select the key node,analyze the correlation temperature-time curve,through the analysis of the temperature of the node changes with time,and combined with the practical experience of sintering molding UHMWPE,the final determination of each stage of the molding time.Finally,the product and manufacturing process are evaluated,and some improvement programs are put forward.This product material itself has the characteristics of environmental protection,light weight and so on,using UHMWPE as the material to develop pump products has very important practical significance.