News List-Nanjing Yunzheng Industrial Equipment Co., Ltd.

Rolling mill manufacturers generally consider that, by “equipment,” they mean devices capable of carrying out the metal‑rolling process—essentially, the complete set of machinery required to produce rolled products. This includes primary equipment, auxiliary equipment, lifting and conveying systems, and ancillary devices. However, in actual production practice, the term often refers solely to the primary equipment.

2023

The Relationship Between Rolling Mill Efficiency and Ambient Humidity and Temperature

Regarding the selection of heating furnaces, appropriate relative temperature values vary. For instance, in a walking-beam furnace, where billets remain in the furnace for a relatively short time, a rolling‑type furnace requires greater driving force to achieve a higher heating rate. Typically, the partial pressure of water vapor at the gas outlet must be kept below half of the external material’s water‑vapor pressure. If a regenerative furnace is used, the water‑vapor fraction in the exhaust gas is generally about 60% of the billet’s surface water‑vapor pressure. For certain types of reheating furnaces, it is essential to maintain the required air velocity; therefore, when designing the furnace structure, both relative humidity and contact conditions should be carefully considered. To meet high air‑velocity requirements, a larger air flow can be employed to reduce relative humidity, thereby increasing the billet’s heating rate and minimizing heat loss.

2023

How can a short-stress rolling mill prevent bearing burnout?

How can bearing burnout in short‑stress rolling mills be prevented? Here, we focus solely on seal failure. When a seal fails, the most serious consequence is leakage of the bearing lubricant, allowing contaminants to enter the bearing and accelerating wear, ultimately leading to bearing burnout. So what are the root causes of seal failure? First and foremost is seal selection. Because rolling mills are frequently disassembled and reassembled, it is essential to use seals equipped with secondary lips, ensuring they are installed in the correct orientation to provide effective containment of lubricating oil or grease.

2023

Common Problems and Solutions for Rollers in Cold Rolling

In the early stages of commissioning its cold‑rolling mill, a steel plant encountered severe production challenges due to surface defects on the rolls, which significantly compromised product quality and disrupted the production rhythm. These roll surface defects primarily include vibration marks, roll‑induced patterns, tool‑mark scratches, cracks, and spalling—each of which adversely affects the finished product’s surface appearance. Investigating the root causes of these defects and developing effective corrective measures is of great practical importance for on‑site operations.

2023

Common Defects of Rollers and Their Remedial Measures

During the operation of rolling mills, various factors often lead to defects such as wear, cracks, spalling, and fractures, which can significantly disrupt the production process. So, how can these issues be addressed? Below, we provide a detailed overview of common roll defects and corresponding remedial measures.

2023

Classification of rolling mill types

Universal rolling mills can be classified according to the arrangement and number of rolls, as well as by the configuration of the mill stands. Two-roll mills are simple in structure and widely used. They are divided into reversible and irreversible types; the former includes preliminary, rail‑beam, and medium‑thick plate mills, while the latter encompasses billet continuous rolling, tandem thin‑sheet rolling, and cold‑rolling or skin‑pass mills for sheet and strip. In the 1980s, two‑roll mills typically featured roll diameters of 1,500 mm, roll lengths of 3,500 mm, and rolling speeds ranging from 3 to 7 m/s.

2023

The Relationship Between Rolling Mill Efficiency and Ambient Humidity and Temperature

Practice has shown that numerous factors influence the efficiency of a rolling mill in daily operations, including environmental conditions such as temperature and humidity—both primary and ambient. Consequently, to enhance mill productivity, narrow furnace tapholes are subject to stringent humidity requirements; when no steel is being tapped and the door is closed, this helps reduce air consumption and heat loss, thereby lowering fuel costs for coal and natural gas.

2023

A Brief Discussion on Protective Treatments for Rolling Mill Equipment

In practical applications, the rolls of rolling mill equipment may develop cracks. Analysis of these cracking phenomena reveals that the primary locations of crack initiation are typically concentrated at the roll necks, with fracture surfaces exhibiting irregular inclined or perpendicular orientations. So, what causes this phenomenon?

2023

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A technology-driven enterprise specializing in the design, manufacture, processing, and sales of Morgan high‑carbon wire, Morgan copper wire rolling mills, and related equipment and spare parts.

Nanjing Yunzheng Industrial Equipment Co., Ltd.

Landline number:+86-025-57118625
Factory Address: Building C1-1, Zhongnan Zhiyu Industrial Park, No. 5 Xiaoqi Road, Xiongzhou Subdistrict, Liuhe District, Nanjing City, Jiangsu Province

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