Square Hole Processing and Fine Cutting: Advantages of Femtosecond Lasers in Grid Processing.

In today's advanced materials processing field, femtosecond laser technology is becoming the preferred method for many complex processing tasks due to its unique advantages of high precision and low damage. The application of femtosecond lasers highlights the irreplaceable value of inverted taper square hole arrays when processing 0.03 mm thick nickel sheets, which are both difficult and challenging.

As a material with good electrical conductivity, corrosion resistance and a certain mechanical strength, nickel sheet has a wide range of applications in electronics, aerospace and other fields. However, it is because of these characteristics of nickel flake, also brings many difficulties to the processing. First of all, the nickel sheet's hardness is relatively high, traditional machining methods such as drilling, milling, etc., in the process of machining is prone to serious tool wear, not only increases the processing cost, but also difficult to ensure the machining accuracy. Secondly, the extremely thin thickness of 0.03 mm requires high force control during the machining process, which may lead to deformation or even damage of the nickel sheet if not careful. Furthermore, the design of the inverted taper square hole array requires an inlet aperture of 114 µm and an outlet aperture of 90 µm, and the R angle of the square hole is less than 0.05 mm, which is hardly achievable by the traditional machining method with such a high precision requirement.

Compared with other processing methods, femtosecond laser processing has obvious advantages. For example, if EDM is used, although holes of a certain shape can be processed, EDM will produce a large heat-affected zone, which will easily lead to changes in the properties of the nickel sheet material, and at the same time, it is difficult to accurately control the size and shape of the holes. Chemical etching processing may cause pollution to the environment, and processing accuracy and efficiency is difficult to meet the requirements. Femtosecond laser processing overcomes these disadvantages. The extremely short pulse duration of femtosecond lasers enables them to concentrate high energy in a very small area in a split second, thus enabling precise removal of material. During processing, the heat-affected area is so small that there is virtually no thermal damage to the surrounding material, ensuring the performance and quality of the nickel sheet. At the same time, by adjusting the pulse energy and repetition frequency of the laser, the amount of material removed can be precisely controlled to gradually form an inverted cone-shaped hole structure, and the R angle of the square hole can be controlled within a very small range.

For the processing of inverted conical square hole arrays in 0.03 mm thick nickel sheets, Monochrome Technology is able to precisely control the laser focusing problem with its professional technology and advanced equipment. Due to the thin thickness of the nickel sheet, the focusing accuracy of the laser directly affects the quality and precision of the holes. Through precise optical system design and adjustment, Monochrome Technology ensures that the laser can accurately focus on the specified position on the nickel sheet. Meanwhile, in terms of processing speed and efficiency, Monochrome Technology optimises the laser's scanning path and processing parameters to achieve efficient processing.

In conclusion, femtosecond laser drilling of 0.03 mm thick nickel sheets for processing inverted cone-shaped square hole arrays is a challenging task. With its unique advantages, femtosecond laser technology is the ideal choice to solve the nickel sheet processing challenges. The participation of Monochrome Technology provides strong support and guarantee to overcome this challenge.