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Overview and Review of Basic Types and Production Processes for Roller Covers in Ball Press Machines

Time：Jun 17,2021

The roller shell of the pellet press is the core component of the machine. The quality of the pellet press roller shell directly determines the service life of the entire machine. Among all factors, the hardness of the roller shell is the most critical parameter for assessing its quality, as it depends on both the specific alloy steel grade used and the precision of the final heat treatment process.

The production process for the roller shell of the ball press machine: First, a blank is created based on the roller shell blueprint, followed by turning operations to achieve a perfectly smooth finish on all four sides and a highly polished surface on the remaining eight. Next, spherical recesses are precisely carved into the circumference of the roller shell—of course, the size and shape of these recesses are determined jointly by factors such as the diameter of the roller shell and the type of material being pressed. Finally, the critical step of heat treatment is carried out. This is the most crucial stage: under otherwise identical raw material conditions, it’s the heat treatment that ultimately determines the hardness of the roller shell.

Pressing roller shell types: From a manufacturing perspective, pressing roller shells can be divided into two categories: cast and forged. Cast roller shells typically use 65Mn alloy steel, which is relatively low in cost but offers lower hardness and moderate wear resistance—making it ideal for compacting fine materials like coal powder and clay. Forged roller shells, on the other hand, commonly utilize 92CrMo alloy steel, resulting in higher production costs. However, this material delivers significantly greater hardness, often reaching HRC62 or above, making it perfectly suited for pressing coarser materials such as iron powder and metal ore fines.

Several Factors Affecting the Ball-Forming Rate of the Pelletizer

What factors affect the ball-forming quality of the pelletizer?