Halogen-free special screw base material and manufacturing method thereof

Abstract

The invention discloses a halogen-free special screw base material. A screw core is made of alloy tool steel with high toughness, and outer layer alloy covers the outside of the screw core. The outerlayer alloy is prepared from the following components by weight percent: 1.8-2.8% of C, 3.8-4.4% of Cr, 6.0-8.0% of Mo, 6.0-7.0% of W, 5.5-6.5% of V, 10.0-12.0% of Co and the balance of Fe. The invention also provides a manufacturing method of the halogen-free special screw base material; the method comprises the steps of firstly, forging, and carrying out heat treatment and mechanical processingto obtain the screw core; then, preparing powder and pressing to form a tubular blank, heating the blank in a high temperature furnace for melting and expanding, extruding the screw core into an innercavity of the tubular blank, enabling the blank to cover the surface of the screw core, then loading the screw core coated with the blank into a mould and carrying out hot press sintering for molding; then, slowly cooling to the room temperature with the furnace, taking out the product and grinding to obtain the screw base material. The product can be applied to the usage occasion of halogen-freeplastics and glass fibers; the normal production cycle is prolonged to 8-12 months, so that the occurrence of undesirable phenomena such as low quality and low productivity is avoided.

Description

technical field [0001] The invention relates to the field of production equipment for environment-friendly plastic products, in particular to a special halogen-free screw base material and a manufacturing method thereof. Background technique [0002] With the continuous progress of social development and the gradual improvement of people's living standards, health has become a more common topic for people to pursue. In addition to people's daily normal diet, plastic products are closely connected with us all the time in daily life— — All beverage packaging, household appliances, etc., and health is inseparable from environmental protection, and new environmentally friendly plastic products will inevitably become the leaders in this field. The so-called environmentally friendly plastics are meeting the international standards in the process of eating and using, and there is no toxic gas released during the combustion process, no harm to the human body and no industry requirem...

AI Technical Summary

Problems solved by technology

[0007] ③Due to the dual factors of high-temperature acid gas corrosion and glass fiber wear in the production process of halogen-free plastics, the service life of the screw components of the plastic machine is greatly shortened, which increases the cost of product production and causes adverse phenomena such as low quality and production capacity

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