The Sendzimir 20-roll mill, also known as the ZR mill, is a highly specialized and sophisticated piece of equipment in the field of cold rolling technology. Below is an introduction to this remarkable machinery:
Overview
The Sendzimir 20-roll mill was invented by the Polish-American engineer, Mr. Sendzimir, in the 1930s. Over the past 80 years, it has maintained its dominant position among various 20-roll cold rolling mills, despite numerous attempts at improvement and the emergence of alternative models like SUNDWIG and FROHLING.
Key Features
Roll Configuration:
The mill is equipped with 20 rolls, including working rolls, intermediate rolls, and backing rolls, arranged in a unique configuration to ensure precise and uniform rolling of the material.
The working rolls, which directly contact the material, have a diameter that typically ranges from Φ25 to Φ45mm, depending on the specific model and application.
Rigid and Lightweight Frame:
The Sendzimir mill features a diamond-shaped monolithic frame that combines excellent rigidity with lightweight design.
This frame design allows for even distribution of forces during rolling, enhancing the accuracy and stability of the mill.
Hydraulic Screwdown Mechanism:
The mill employs a hydraulic screwdown mechanism to adjust the gap between the working rolls.
This mechanism uses a hydraulic cylinder to drive a rack, which in turn rotates an eccentric shaft with gear segments. The eccentric movement of the shaft causes the upper set of backing rolls to move in an arcuate path, achieving the desired roll gap adjustment.
High Rolling Speed and Precision:
The Sendzimir 20-roll mill is capable of operating at high speeds, with maximum rolling speeds reaching up to 300m/min (depending on the model).
Its precision control systems ensure that the material is rolled to the exact thickness and surface roughness specifications required.
Versatility:
The mill can handle a wide range of materials, including stainless steel, and can be used for both thin and thick sheet rolling.
However, it should be noted that the Sendzimir mill may have limitations when rolling materials with wedge-shaped cross-sections due to its fixed roll configuration.
Applications
The Sendzimir 20-roll mill is widely used in the metal processing industry for cold rolling of thin sheets and coils. Its ability to produce high-quality rolled products with precise thickness and surface finish makes it ideal for applications in the automotive, aerospace, and electronics industries.
Conclusion
The Sendzimir 20-roll mill is a testament to engineering excellence and innovation. Its unique design, rigid frame, and precision control systems make it a preferred choice for cold rolling applications. With its ability to produce high-quality rolled products at high speeds, the Sendzimir mill continues to play a crucial role in the metal processing industry.