Against the backdrop of the global wave of green transformation and intelligent upgrading in the industry, high-temperature sectors such as iron and steel, cement, and non-ferrous metals are imposing increasingly stringent performance requirements on refractory materials. As a critical indicator determining the high-temperature stability, corrosion resistance and service life of refractory materials, the density uniformity of green bodies directly affects the operational safety and comprehensive costs of end products. With 45 years of deep cultivation in the press industry, Zhengzhou Haloong Machinery Co., Ltd. has achieved technological breakthroughs in servo screw presses, providing solutions for green body density uniformity to the refractory industry and empowering refractory enterprises worldwide to realize quality upgrading and efficiency improvement.

Green Body Density Uniformity: The "Lifeline" of Refractory Product Performance

Refractory materials operate in service environments characterized by extreme high temperatures, drastic temperature fluctuations and chemical corrosion. Insufficient density uniformity of green bodies leads to uneven internal stress distribution of products, which is highly likely to trigger crack propagation, structural spalling and even collapse under high temperatures. Data shows that when the coefficient of variation of green body density exceeds 1.5%, the service life of refractory products will be shortened by more than 30%. In contrast, products with a porosity controlled below 15% and qualified density uniformity can see their thermal shock resistance times increased to more than 30, significantly reducing the downtime and replacement costs for end enterprises.

Traditional forming equipment struggles to achieve consistent density across the entire green body due to low pressure control accuracy and uneven force transmission. Friction presses rely on mechanical transmission, resulting in unstable energy release and prone to local overpressure or underpressure; ordinary hydraulic presses suffer from response lag and cannot adapt to the dynamic process requirements of "air exhaust - compaction" in refractory forming. These pain points have become bottlenecks restricting the high-end and refined development of the refractory industry.

Haloong Servo Screw Press: Solving the Uniformity Dilemma with Precision Technology

Based on its profound understanding of refractory forming processes, Zhengzhou Haloong has developed a static pressure numerical control servo screw press. With servo direct drive technology at its core, the press builds a full-process precision control system, fundamentally solving the problem of uneven green body density and demonstrating seven key advantages:

Servo Direct Drive for Energy Control, Realizing Global Controllability of Density Precision

Adopting a direct drive design with a permanent magnet synchronous servo motor and abandoning the traditional clutch structure, the pressing energy can be precisely preset through digital programs, with the repeat accuracy error of energy per stroke approaching zero. Tailored to the needs of refractory forming, the striking force, frequency and speed can be flexibly set to achieve a stepped process of "light pressing for air exhaust first, then heavy striking for forming", effectively eliminating internal pores of the green body and ensuring density uniformity from the center to the edge. This enables the coefficient of variation of density for products in the same batch to be controlled below 1.5%, far exceeding industry standards.

Design without Fixed Bottom Dead Center, Adapting to Complex Forming Scenarios

Breaking through the structural bottom dead center limitation of traditional equipment, it avoids the problem of overload jamming caused by material size deviation or uneven temperature. Through the progressive forging mode, the green body is subjected to multiple rounds of precise pressing, which can adapt to the forming needs of refractory materials of different types such as high-alumina, magnesia and carbon, as well as complex products such as special-shaped bricks and honeycomb checker bricks. It ensures uniform stress on all types of green bodies during deformation and avoids insufficient local densification.

Static Pressure Transmission Structure, Featuring Low Wear and High Stability

Equipped with a fully enclosed static pressure screw, nut and bearing transmission, a stable oil film is formed for protection during operation. Combined with a fully automatic forced lubrication system, it can effectively avoid wear caused by inadequate manual refueling, doubling the service life of the equipment compared with ordinary screw presses. The short transmission chain and simple structure reduce energy transmission loss, ensuring that pressure is continuously and stably transmitted to all parts of the green body and guaranteeing the long-term consistency of density uniformity.

High-Efficiency and Energy-Saving Operation, Reducing Comprehensive Production Costs

The servo motor only operates during forming operations and enters hibernation during processes such as feeding and demolding, saving more than 55% energy compared with traditional friction presses and greatly reducing production energy consumption. At the same time, the slider speed is extremely fast when the equipment approaches the bottom dead center, enabling the forming process to be completed in an instant before the raw materials cool down. The short contact time with the mold results in small temperature fluctuations of the mold, extending its service life by 30% and further compressing comprehensive costs.

Intelligent Integration, Enabling Unmanned Precision Management and Control

Equipped with Haloong's intelligent production management system, it can link with equipment such as automatic feeding, mold release agent spraying and part picking and conveying to build a fully automated production line. One-click control through digital programs enables stable production without skilled operators, reducing the impact of human factors on forming accuracy. It also supports remote monitoring and parameter debugging, collecting forming data in real time to provide data support for the optimization of green body density uniformity, in line with the global trend of intelligent manufacturing.

As a leading enterprise in the field of servo screw presses, Zhengzhou Haloong has always been driven by technological innovation. With 45 years of R&D accumulation and practical experience, its products not only cover mainstream domestic refractory enterprises, but also are exported to Europe, Southeast Asia, Africa and other regions, adapting to the refractory production needs of different industries worldwide. From the short-process steelmaking of hydrogen metallurgical electric furnaces to the low-carbon transformation of cement rotary kilns, Haloong servo screw presses provide core equipment support for the production of high-end refractory materials with their stable density control capability.