产品材质选用优质含金钢（ 38CrmoALA ），经过可调质定性、表面氮化、抛光等工艺精工制作，具有精密耐磨之特点。 The material of the alloy barrel of the injection molding machine is made of high-quality gold-containing steel ( 38CrmoALA ), which is precision-made by adjustable quality and qualitative, surface nitriding, polishing and other processes, and has the characteristics of precision wear resistance.
料筒材料为满足料筒的工作要求，必须由优质的耐高温、耐磨损、耐腐蚀、高强度的材料做成。 1. In order to meet the working requirements of the barrel, the alloy barrel material of the injection molding machine must be made of high-quality high-temperature-resistant, wear-resistant, corrosion-resistant, high-strength materials. These materials should also have good machinability and heat treatment properties. In addition to 45 # steel, 40Cr, 38CrMoAL, the barrel can also be made of cast steel and ductile iron. The feed section with bushing can be made of high quality cast iron.
In recent years. With the development of high-speed extrusion and engineering plastics, especially when extruding glass fiber reinforced plastics and plastics containing inorganic fillers, higher requirements have been placed on the abrasion and corrosion resistance of barrels. The Xaloy alloy developed by the United States and the United States is a new type of wear-resistant and corrosion-resistant material, and is currently widely used abroad. This material has a low melting point, is hard, has good weldability with steel, has good machinability, good casting performance, and has no casting stress. Even if it is bent after casting, it will not fall off in scales.
It is applied to the barrel by adopting this method: The powdery Xaloy alloy is heated together with the barrel at a high temperature. Due to its low melting point, it can be melted into a flowing state at about 1200 ° C. At this time, The barrel rotates at high speed, and the huge centrifugal force generated by the molten Xaloy makes it cast on the inner wall of the red-hot barrel. Its thickness is about 2 mm. After cooling, it is removed by grinding to about 0.20 mm. General barrel requirements.
According to reports, a Xaloy alloy produced in Belgium has a hardness value of Rc58-64. At 482 ° C, the hardness is not significantly reduced, and the corrosion resistance is 12 times greater than that of nitriding steel.
料筒壁厚的决定及强度计算： 2. Determination of wall thickness and strength calculation of alloy barrel of injection molding machine :
1) Determination of barrel wall thickness The barrel is rarely discarded due to insufficient strength, mainly due to corrosion and wear. In addition to considering the strength of the barrel wall thickness, the processability and thermal inertia of the barrel structure are more considered. The wall thickness determined by the latter two factors is often greater than the value calculated according to the strength conditions. Because there is no mature calculation method for calculating the wall thickness of the barrel according to the heat transfer characteristics of the barrel, at present, most of the wall thickness is determined based on empirical statistics, and then the strength is checked.
2) Strength calculation The strength calculation of the barrel is performed as a thick-walled barrel. No longer discussed here Note: When the barrel is a brittle material, it can be calculated using * strength theory.
When the barrel is a plastic material, the fourth strength theory is used for calculation.
When the sleeve is inlaid in the barrel, it is equivalent to the press-fit connection in the interference fit in the "machinery part". At this time, the stress state of the sleeve and the barrel is more complicated, and the strength calculation is more complicated.