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Injection Molding Machine Screw and Barrel Design Principle
Injection Molding Machine Screw and Barrel manufacturers tell you that the main part of the pin screw is an ordinary screw, and the pin can be set in the melting section of the screw or the drop groove of the metering section or a smooth cylindrical surface without screw grooves at the end of the metering section. The pins are arranged in a certain arrangement, with varying degrees of density and quantity. Injection Molding Machine Screw and Barrel manufacturers tell you that cylindrical pins are formed by fitting the pins into the holes of the screw; square or diamond pins are formed by milling directly on the screw.
The manufacturer of Injection Molding Machine Screw and Barrel tells you that if these pins are set in the melting zone, the pins can break up the solid bed, destroy the two-phase flow, stir the solid and liquid phases together, and make the undissolved solid phase fragments and the solid phase The contact area of the material is increased to promote melting. If the pin is set in the melt conveying area, its main function is to divide the material flow, increase the interface, change the direction of the material flow, and rearrange the flow beam. Divide and merge multiple times, change the flow direction, and homogenize the melt composition and temperature.
The mixing section is an inwardly slotted structure arranged at the end of the common screw homogenizing section, and its outer diameter is equal to the outer diameter of the screw. The grooves are divided into several groups, and each group is the confluence area of the material. The materials are divided by grooves, meet in the confluence area, and then divide and confluence. The principle is similar to the pin type.
The manufacturer of Injection Molding Machine Screw and Barrel tells you that the characteristic of the separation screw is that in addition to the original screw thread (called the main screw) on the melting section, there is also an additional thread (called an additional thread) whose outer diameter is slightly smaller than The outer diameter of the main thread and the lead of the main and auxiliary threads are different. The auxiliary thread starts from the end of the feeding section (and is connected with the feeding section here), and after several threads, it gradually intersects with the main thread of the homogenizing section.
Injection Molding Machine Screw and Barrel manufacturers tell you that the screw groove depth and thread lead of this screw change gradually from the beginning of the feeding section to the end of the homogenization, that is, the thread lead gradually narrows from the width, and the groove depth gradually becomes shallower from the depth. , which can maximize the compression of the material.