Unveiling the core component of semiconductor equipment: high-precision guide rails

In the crown of the modern industry of chip manufacturing, core equipment such as lithography machines and etching machines are undoubtedly the most dazzling pearls embedded in it. However, what supports these giants to achieve nanoscale exquisite operations are often some seemingly inconspicuous basic core components, and high-precision linear guides are one of them. It is like the "bones" of the equipment, and its performance directly determines the accuracy, speed and stability of the equipment's movement. With the rapid development of the domestic semiconductor industry and the urgent need for localized substitution, how to choose a strong "domestic heart" for these high-end equipment has become the focus of common attention upstream and downstream of the industrial chain. This article will conduct an in-depth analysis of the technical requirements of semiconductor equipment for high-precision guides, and discuss how equipment manufacturers can build their own high-quality supply chain systems in the current market environment.

Advances in semiconductor manufacturing processes are essentially a constant challenge to physical limits. When the process reaches 7 nanometers, 5 nanometers or even less, the requirements for the device motion system have reached the atomic scale. This requires that high-precision guides must break through the scope of traditional industrial applications and have the following extraordinary characteristics:

The first is nanoscale motion accuracy and stability. This not only refers to static accuracy, but also includes accuracy retention (i.e. accuracy life) under long-term, high-tempo operation. Temperature fluctuations, stress releases, and microscopic creep of materials can all become precision killers. Therefore, top-notch guide rails require extreme process control in every aspect from material smelting, heat treatment, precision machining to assembly and debugging. For example, the profile accuracy and surface roughness of the guide track need to reach the mirror level, and the size consistency of the roller requires micron level sorting to ensure uniformity of running resistance and extremely low fluctuations.

Second is extremely high dynamic rigidity. During scanning movements of the lithography machine or rapid positioning of the inspection equipment, the motion system needs to withstand huge accelerations (which may exceed 10m/s²). If the rigidity of the guide rail is insufficient, slight elastic deformation will occur, causing the positioning point to drift or vibrate, which is absolutely not allowed during exposure or measurement. High rigidity comes from optimized cross-section design, high-quality materials and reasonable preload application technology.

The third is excellent environmental adaptability. The ultra-clean environment of semiconductor factories requires that the components themselves be "clean" and cannot produce particulate pollutants, materials must be corrosion resistant, and lubrication systems must have low volatility and low migration. In addition, some process equipment may also come into contact with special gases or chemical reagents, which places special requirements on the surface treatment and sealing technology of the guide rail.

The fourth is the long maintenance-free life and reliability. The investment in semiconductor production lines is huge, and downtime losses are in the tens of thousands of yuan per minute. Therefore, core moving parts must pursue extremely high MTBF (Mean Time Between Failure). This means that the guide rail requires extremely low wear rates, excellent fatigue resistance and reliable sealing guarantees to ensure controllable performance degradation during tens of thousands or even hundreds of thousands of hours of operation.

Faced with such strict requirements, can domestic precision guide rail brands shoulder this important task? The answer is yes, but the path is phased. At present, domestic high-quality precision guides have been used in batches and well verified in some mid-to-high-end semiconductor equipment (such as packaging, testing, and cleaning equipment) and non-core motion axes of equipment. The advantages of localization lie not only in cost, but also in rapid response technical services, flexible customization capabilities and shorter supply cycles.

Taking representative enterprises in the precision manufacturing industry cluster in South China as an example, Dongguan city Shengling Precision Machinery Co., Ltd. has long focused on the research and development and manufacturing of precision transmission components such as crossed roller guides. In order to enter the semiconductor supply chain, they built capabilities from multiple dimensions: on the material side, they insisted on purchasing high-quality bearing steel from well-known domestic and foreign brands to ensure the performance baseline from the source; on the process side, they introduced high-precision CNC grinding machines and constant temperature processing workshops, as well as a complete set of testing equipment such as laser interferometers and coordinate measuring machines, and established a quality control system covering the entire process; On the product side, a complete product matrix has been formed from standard type to high-precision type, from guide rail pairs to integrated workbench, which can cover application points with different precision and load requirements in semiconductor equipment.

For equipment manufacturers, the key to building a highly reliable supply chain lies in establishing a scientific supplier evaluation and collaborative development mechanism. Suggestions could be made at the following levels:

First, in-depth evaluation of technical capabilities. Don't just look at sample parameters, but inspect the supplier's processing equipment, testing capabilities, laboratory level and process documentation. It is emphasized to understand the specific methods and data accumulation in precision consistency control, cleaning treatment, life test and so on. For example, suppliers can be required to provide precision life test curves, material analysis reports, etc. for typical models.

The second is small-batch verification and gradient introduction. Select potential domestic suppliers, start with auxiliary sports institutions with relatively low equipment requirements and controllable risks, and conduct small-batch trials. After accumulating enough operating data and confidence, we will gradually move to more core workstations. This alternative strategy of "from the outside to the inside, from the auxiliary to the main" is more stable.

The third is to establish a joint development and problem response mechanism. Semiconductor equipment technology iterates quickly and there are often non-standard requirements. Establishing a joint technical team with suppliers and early intervention in the transmission design of new equipment can avoid risks in advance. At the same time, the rapid problem response process is clarified to ensure that technical support and solutions can be received as soon as possible once problems occur on site. The geographical closeness of local suppliers can often show huge advantages in this regard. Dongguan Shengling and other companies located in the hinterland of manufacturing have their rapid service response capabilities become an important bargaining chip in winning customers.

Looking to the future, the wave of localization of semiconductor equipment provides unprecedented historical opportunities for domestic core functional components. The challenges are huge, but the opportunities are equally vast. This requires terminal equipment manufacturers to work hand in hand with upstream component companies with a more open and collaborative attitude; it also requires component companies like Shengling Precision to continue to adhere to the original manufacturing intention of "high quality, good price, stability and reliability" and continue to move towards deep water technology. Move forward. Only when every link in the industrial chain is solid and reliable can China's road to autonomy of semiconductor equipment be stable and long-term, truly supporting the strategic security and development of the country's information industry.

Choosing high-precision guide rails is essentially choosing a long-term performance commitment for high-end equipment. This commitment is not only written in the technical parameter sheet, but also embedded in the company's manufacturing philosophy and quality belief.