shreejicorp

Plant managers rarely notice screw wear the moment it begins — it shows up gradually, as small dips in output, minor quality issues, or slightly longer cycle times. By the time the problem is obvious, the machine may have been running below capacity for weeks or months. Recognizing the early warning signs of screw wear allows engineers and procurement teams to plan replacements proactively, rather than reacting to a costly unplanned shutdown. This article walks through the seven most common indicators that a screw and barrel set has reached the end of its useful service life. 1. Declining Output Without a Process Change If your machine's throughput has dropped even though the material, temperature settings, and cycle parameters haven't changed, screw wear is one of the most likely causes. Why This Happens As the screw flights wear down, the clearance between the screw and barrel increases. Molten material can slip backward through this gap instead of being pushed forward effici...

  Hardened Screw The hardening of screws is done by two processes — quenching and annealing. Quench hardening i s  the first process in which steel and cast iron alloys are hardened. The material — here the screw, is heated to a certain temperature and then rapidly cooled. This makes the screw hardened. The hardened screw is then tempered to reduce the brittleness that may have been increased from the quenching process. Another process is the annealing process. This is a kind of treatment in which heat alters the micro-structure of the screw which eventually causes changes in properties like strength, hardness, and ductility of the screw.  Hardened screws  use imported high-speed steel, after a series of quenching & annealing processes to achieve high toughness & hardness, especially suitable for high wearing production. The material that is used in H13 to achieve the surface hardness between 62–65 HRC. The available diameter sizes vary from 14mm to 120mm and...