Laser Additive Technology: An Efficient Repair Solution for Roller Press Shaft Wear

As a core transmission component in industrial production (e.g., construction materials and metallurgy sectors), roller press shaft wear directly causes increased equipment vibration, reduced precision, and even production halts. Traditional repair methods (such as welding repair, brush plating, and thermal spraying) require offline disassembly of the shaft, leading to pain points like long downtime, high labor costs, and shaft deformation risks due to thermal stress. The emergence of laser additive in-situ repair technology has achieved a breakthrough in "roller press shaft repair without disassembly and in-situ operation." It not only solves the core problems of traditional repair but also enhances the shaft's wear resistance, reducing maintenance costs for enterprises and becoming the mainstream technical direction for current roller press shaft repair.

Traditional Repair Pain Points vs. Advantages of Laser Additive Technology

Traditional roller press shaft repair relies on offline operations: processes like welding repair and brush plating require prior disassembly of the shaft and transportation to the workshop. A single repair often results in downtime of several days. Additionally, thermal stress generated during welding easily causes shaft cracks and deformation, and subsequent additional processing is needed to fit the bearing, leading to high overall costs and heavy labor intensity. In contrast, laser additive technology enables full in-situ repair of the equipment without disassembly and transportation, reducing downtime by more than 90%. The repair process involves no thermal stress, avoiding damage to the shaft's metal structure; there is no restriction on the repair thickness, and the bearing can be directly fitted without subsequent processing. Furthermore, laser additive technology avoids the "secondary wear" risk of traditional repair, significantly extending the service life of the roller press shaft.

On-Site Core Process of Laser Additive Repair for Roller Press Shafts

Laser additive repair of roller press shafts requires following a standardized on-site process to ensure repair precision and effectiveness:

The first step is surface treatment: use a grinding wheel to remove oil stains, rust, and burrs from the shaft shoulder and bearing contact surface, and grind the worn area until the metallic luster is exposed to lay the foundation for the adhesion of repair materials.
The second step is determining positioning points: add a reference point at the worn area and grind it to match the wear amount, controlling the subsequent repair thickness.
The third step is bearing test installation: temporarily install the bearing and measure concentricity and perpendicularity (with an error of ≤0.2mm) to check for hidden deformation of the shaft.
The fourth step is application and curing: evenly apply the laser additive material and allow it to cure naturally for 6-12 hours; after curing, remove excess material.

Finally, complete the secondary application and bearing installation: strictly control the fastening process within 40 minutes. In the later stage, re-tighten the bolts at intervals of 3 hours (under no-load operation) and 6/12/24 hours (under full-load operation) to ensure long-term operational stability.

Laser Additive Repair Material: Key Support for Preventing Secondary Wear

The core competitiveness of laser additive repair for roller press shafts lies in the characteristic advantages of its dedicated repair material. This material is a metal-based composite paste, which differs from traditional metal materials (featuring high rigidity but low toughness) by combining the high strength of metal with the impact resistance of an elastic matrix. It not only adheres tightly to the metal surface of the roller press shaft but also absorbs shocks and vibrations during equipment operation, fundamentally reducing the possibility of "secondary wear." Meanwhile, the material can be directly fitted to the bearing without additional processing after curing, avoiding fitting issues caused by processing errors in traditional repair. This further improves the operational precision and durability of the repaired shaft, increasing the service life of the roller press shaft by 30%-50% compared with traditional repair solutions.

Economic Value and Application Scenarios of Laser Additive Technology

From the perspective of enterprise operations, the economic value of laser additive technology for roller press shaft repair is significant:

On one hand, no disassembly and transportation eliminate costs for heavy component transportation and offline processing, reducing labor costs by more than 60%. On the other hand, downtime is shortened from several days (traditional repair) to several hours, reducing the enterprise's daily downtime losses of tens of thousands of yuan.
This technology is particularly suitable for industries relying on "continuous roller press production," such as construction materials, metallurgy, and chemical engineering. In these industries, roller press shafts operate under long-term high-load and high-vibration conditions, leading to high wear frequency. The "in-situ rapid repair" and "secondary wear prevention" features of laser additive technology effectively ensure continuous production line operation and reduce annual maintenance costs.

Laser Additive Technology Becomes the Preferred Solution for Roller Press Shaft Repair

In summary, laser additive technology perfectly addresses the pain points of traditional roller press shaft repair with its four core advantages: "in-situ repair, no thermal stress damage, wear-resistant material, and low economic cost." Its standardized on-site process ensures repair precision, and the dedicated composite material enhances shaft durability. Suitable for high-load production scenarios across multiple industries, it not only helps enterprises save downtime and maintenance costs but also extends the service life of equipment components and improves production stability. As industrial equipment maintenance demands for "high efficiency, low cost, and low damage" increase, laser additive technology has become the preferred solution for roller press shaft wear repair and will be further promoted in more heavy equipment repair fields in the future.