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Chemical deburring process of PCB circuit board
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Chemical deburring process of PCB circuit board

When it comes to deburring, many people think of washing and grinding. Washing and grinding is now the most commonly used method of deburring. It is a way of using the friction between the grinding stone and the workpiece to remove burrs. Compared with many deburring methods, the initial cost is low, simple operation is one of its advantages, but with the continuous improvement of industrial requirements, its dominant situation began to decompose, more and more new methods are applied to the field of deburring, see more electrochemical method, electrothermal method, sand blasting, ultrasonic and so on. The following is to introduce a new deburring method: chemical deburring method.


Chemical deburring method actually existed as early as the middle of the 20th century, but it was not widely used in the industrial field. This is because at that time, various methods were not perfect, and there were more or less limitations in the aspects of repeatability, reliability, stability, cleanliness and environmental protection. It was not until the end of the last century that a breakthrough was made in this field. The CULLYGRAT process is the result of this period. CULLYGRAT is a solution that takes advantage of the differences between substrate structure and burr and selectively removes burr through vertical reaction. Compared with traditional chemical deburring, this process has made great progress in all aspects, especially in reliability, repeatability, stability, environmental protection and other aspects is far superior to the traditional process, the process performance is briefly introduced as follows.

First, efficient and time-saving.

Compared with the traditional process, the processing time of this process is greatly improved. Using this process for deburring treatment, generally only need a few minutes, the shortest product only need tens of seconds, more specific circumstances, depending on the material of the product, the size of the burr and customer processing requirements. Another manifestation of the high efficiency and time saving is that the process can be applied to a wide range of mass production. Due to the high replicability and reliability of the product, the processed products have a high consistency in both precision and color size, especially in the dimension control, its precision can reach the micron requirements. All these guarantee its wide application in industry.

Second, improve the product surface finish.

The surface finish of the workpiece can be improved by using this process to treat burrs, so as to achieve polishing effect. When the workpiece is processed in various ways, the plane has a roughness of different degrees. When the process is processed, it can reduce the index very well. This is because the process can selectively react vertically to the product, so that the concave and convex plane gradually approaches the plane.

Third, a wide range of applications.

Whether a product can adopt the process mainly depends on the material and processing requirements of the product, not affected by its processing method, geometric shape and so on. Its target materials are mainly iron, copper, aluminum and their alloy materials, so far, its successful application of more than 200 kinds of materials, more widely used, especially in a variety of machining and mechanical, electronic manufacturing fields, applications.

Fourth, safe and reliable, environmental protection economy, simple operation.

The deburring process has the characteristics of safety, reliability and environmental protection. Safety mainly in two aspects, first, product safety, mainly refers to the processing of products have a high quality assurance, will not change the mechanical properties and physical and chemical properties of the product due to the process. Also included are the safety features of the product itself, which has the MSDS safety certification. Second, operation and personnel safety. The process does not require specialized technical personnel to operate, operators only need to go through simple training, and in the operation, only need to pay attention to the general chemical reagent operation safety can be. In terms of environmental protection, this product meets ROHS certification, which is also an important guarantee for its long-term application in Bosch GMBH.

Fifth, can improve the electroplating effect and phosphating amount of products, prevent hydrogen embrittlement phenomenon.

Because the product can generally improve the surface finish of the product, it is conducive to improve the plating adhesion of the product, so as to improve the plating effect. In addition, the process can prevent hydrogen embrittlement, because the process does not form a closed space, which helps to prevent acidic materials during plating from being trapped inside the workpiece, thus preventing hydrogen elements from entering the internal material of the workpiece and causing hydrogen embrittlement.

Sixth, can enhance the corrosion resistance of the product.

Using this process can better let the anti-rust layer and product combination, so as to better protect the workpiece. Aiming at this process, some customers have done salt spray test, and the results found that the products treated by this process can greatly extend the salt spray test time.

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