Detailed introduction

09

2023

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03

What is the role of injection molding machine barrel screw


The quality of the barrel screw of the injection molding machine will affect the melting level and productivity of the material, so in the usual use of the injection molding machinebarrel screwRoutine maintenance abnormal key. The barrel screw of the injection molding machine will be damaged during use. You can surfacing wear-resistant aluminum alloy in part of the screw teeth of the barrel screw of the injection molding machine, or you can improve the wear resistance and corrosion resistance according to the size of the screw. Of course, this method generally has special standards, and the production and processing costs are very high. Generally, if the maintenance cost and upgrade cost are relatively high, if the change cost is very high, we will generally replace the new injection molding machine barrel screw. There is also a ratio between the maintenance cost and the time of the barrel screw of the injection molding machine used after repair, the upgrade cost and the renewal time. Generally, people will choose a smaller ratio, which is more reasonable and economical.

The barrel screw of the injection molding machine is an indispensable part of the injection molding machine. Its role is to transport, shrink, melt, mix and pressure the plastic. All of this is achieved by turning the screws in the barrel section. When the barrel screw of the injection molding machine rotates, the plastic will rub and exercise each other between the inner cavity of the barrel section, the bottom of the screw groove, the pushing surface of the screw edge and the plastic.

  

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The basic principle of injection molding machine can be understood as the uniform melting of plastic raw materials in the body, according to the injection, filling, pressure test, refrigeration and other forms of injection molding products. Under the influence of the barrel screw of the injection molding machine, the granular plastic stored in the Buchner funnel continues to exercise along the screw groove. Because of the synergy between the heating outside the barrel and the cutting of the screw of the injection molding machine barrel, the plastic continues to heat up and soften, resulting in viscous fluidity of the solution, while the melting force of the screw head pushes the screw back. By changing the screw back pressure (pump oil friction resistance in the work) to adjust the screw pump oil rate, change the plastic flow of the injection molding machine barrel screw tank body, so as to manipulate the effect of plastic melting performance.

Injection Molding Machinebarrel screwCommon materials and material provisions:

Common and common injection molding machine barrel screw materials are 45 steel, 40Cr, nitride steel and 38CrMOAl, etc. The following introduces the performance regulations of these raw materials one by one, as follows:

1, 45 steel is cheaper, cost-effective is also very high, production and processing function, the only thing left is not enough: wear resistance and corrosion resistance is poor.

2. The effect of 40Cr is stronger than that of No. 45 steel, but we often insert a layer of chromium on it to improve the corrosion resistance and wear resistance of the barrel screw of the injection molding machine. However, it has high requirements for the stainless steel layer. If the coating is too thin, it is easy to be damaged, and if it is too thick, it will fall off and accelerate its erosion. Therefore, it is not used much at this stage.

3, nitrided steel, 38CrMoAl comprehensive effect is relatively good, their application is also very extensive. General nitriding treatment layer up to 0.4-0.6mm. However, the level of corrosion resistance of these materials is very low, so the price is still very expensive.