The worm and cylinder of an injection molding machine are critical components that control the flow of melted plastic into the mold. The performance of these components can have a significant impact on the quality of the molded parts.

The worm is a screw-like component that is responsible for conveying the melted plastic from the barrel of the machine to the front end, where it is injected into the mold. The cylinder is a chamber that surrounds the worm and creates pressure that pushes the melted plastic through the machine.
There are several factors that can affect the performance of the worm and cylinder, including the materials used, the design and manufacturing quality, and the operating conditions of the machine.
One of the key factors that affects the performance of the worm and cylinder is the viscosity of the melted plastic. The viscosity of the melted plastic determines how easily it can flow through the machine and into the mold. If the viscosity is too high, the melted plastic may not be able to flow through the machine, resulting in quality issues with the molded parts.
Another factor that can affect the performance of the worm and cylinder is the temperature control of the machine. Maintaining a consistent temperature in the barrel and cylinder is essential for ensuring the quality of the molded parts. If the temperature fluctuates, the melted plastic may become too thick or too thin, which can result in defects in the molded parts.

To ensure optimal performance, the worm and cylinder should be properly maintained and serviced. This may include regularly cleaning the components, checking for wear and damage, and replacing worn or damaged parts as needed.
In summary, the performance of the worm and cylinder of an injection molding machine is critical for producing high-quality molded parts. The factors that affect their performance include the viscosity of the melted plastic, the temperature control of the machine, and proper maintenance and servicing.