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Research on Drilling Head of Computer Numerical Control Drilling Machine for Printed Circuit Board
Abstract. In recent years, in the development of electronic and circuit technology, printed circuit boards (PCB) have been widely used in the production of electronic products. With the continuous improvement of production technology, the accuracy and speed requirements of the production holes on PCB are getting higher and higher. CNC drilling machine has become the indispensable equipment for producing printed circuit boards. This article mainly introduces the design and research of the drilling head for CNC drilling machine for printed circuit boards, and proposes some corresponding optimization schemes and improvement suggestions.
1. Introduction
Printed circuit board is a common name for modern electronic components, which are composed of copper thin plates, core boards and insulation films. It can connect the necessary electrical components to make a whole circuit, so as to realize various functions. With the rapid development of science and technology and the progress of electronic technology, different types of printed circuit boards are used in almost all electronic products. In the production of printed circuit boards, the production holes are also very important, because they can make the electrical signals correctly transmitted, and the drilling of holes is one of the most important processes.
2. Design and Research of Drilling Head
Drilling head plays a very important role in the whole process of drilling holes on printed circuit boards. It is the core part of the entire drilling machine and is mainly composed of the drive system of the spindle motor and the cooling device of the electronic control system. In order to better adapt to the production of printed circuit boards, it is necessary to take into account the principle of accurately positioning the positioning system and greatly improve the production efficiency of the machine.
For this purpose, CNC drilling machine drill head contains two layers of bar, the lower bar mount spindle motor, the spindle motor is connected with the mechanical components, such as lathe key, square hole, fan blade and other components installed on the spindle motor; the upper bar equipped with two or four shafts and two automatic feed, the lower middle One hole provides a cooling device for the spindle; the upper middle hole is connected with the corresponding cooling device according to the needs.
In order to ensure the accuracy of the solder joint and the positioning accuracy of the CNC drilling machine, in the design of the drilling head, a special positioning system should be adopted. On the one hand, the design should be simple, the structure should be as light as possible and the interference should be as small as possible; on the other hand, the installation precision of the spindle motor should be taken into consideration, so as to reduce the shaking caused by the installation and improve the position accuracy of the drill head.
3. Optimization Scheme and Improvement Suggestion
(1) Optimization scheme
a)Fine tuning of positions. Through the combination of fixed plate and adjustable plate, the distance between the two drill holes can be regulated in small units, so as to avoid the inaccuracy caused by the drill head and improve the positioning accuracy.
b)High accuracy machine.The spindle and the mechanical components should be made of high precision materials and precision grinding technology to ensure proper contact and positioning accuracy of the components.
c)Improve the cooling effect.In the actual application process, it is necessary to consider the cooling effect of the system. For the design structure of the two-layer or four-axis drill head, it is necessary to optimize the corresponding configuration of the cooling device to reduce the temperature rise of the system.
(2) Improvement Suggestion
a)Improve the stability of the machine.The choice of spindle motor should also be taken into account. It is recommended to choose a more stable and reliable spindle motor.
b)Improve the accuracy of the spindle. The selection of spindle should also be considered. A high precision and stable spindle should be chosen to make sure the good positioning accuracy of the drill head.
c)Reduce the structure.In the process of designing and optimizing the drill head, it is necessary to try to reduce the structure of the drill head, so as to reduce the weight and make the use more convenient.
4. Conclusion
This article introduces the design and research of the drilling head for computer numerical control drilling machine for printed circuit boards, and puts forward some corresponding optimization schemes and improvement suggestions. At the same time, it is necessary to consider the factors in cooling, stability, accuracy and structure in the actual design process to meet the production needs of printed circuit boards.
