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Fu L.,Shenzhen Jinzhou Precision Technology Corporation | Guo Q.,Shenzhen Jinzhou Precision Technology Corporation
Circuit World | Year: 2012

Purpose - The purpose of this paper is to present a method and a system for measuring drill bit temperature on-line in the micro drilling process and to characterize drilling processes via drill bit temperature. Design/methodology/ approach - The drill bit temperature measurement system was first established by the utilization of an infrared camera. Then the drill bit temperature in a drilling cycle was characterized. The temperatures of an ultra-small micro drill bit and a coated drill bit were measured and compared. Findings - The temperature of an ultra-small drill bit can be measured on-line via the proposed temperature measurement system. The drilling process can be characterized by the drill bit temperature. The drill bit temperature decreased when a coated drill bit was used. Originality/value - The paper highlights key points for measuring the drill bit temperature on-line by an infrared camera and characterizes PCB drilling processes by measuring the drill bit temperature. Copyright © 2012 Emerald Group Publishing Limited. All rights reserved. Source


Fu L.,Shenzhen Jinzhou Precision Technology Corporation | Zou H.,Harbin Institute of Technology | Wang B.,Harbin Institute of Technology | Song F.,Hans Tech
Circuit World | Year: 2013

Purpose - The purpose of this paper is to verify the feasibility and reliability of mineral casting applied in high-precision printed circuit board (PCB) drilling machine. The mechanical properties of machine frame are quantified to provide a solution for machine tool industry to seek a perfect substance competing with classic materials such as cast iron and granite. Design/methodology/approach - The optimal design of machine frame is performed via the CAD system combined with finite element analysis (FEA). The mechanical properties of the frame elements are evaluated by a series of mechanical experiments: static performance is quantified by flatness tests, dynamic behavior is estimated by experimental and numerical models, respectively. Meanwhile, the performance of the frame element with traditional materials is examined experimentally. Findings - Mineral casting parts can be successfully applied to PCB drilling machine to meet high accuracy requirements. The characteristic of mineral casing gives the most possibilities in structural design. The frame parts show good static/dynamic behaviors by structural optimization processes. Especially, the machine frame with mineral casting gains a great weight reduction compared with traditional materials. Originality/value - The application of mineral casting in PCB drilling machine offers greater design flexibility and innovative system solutions. The combination of FEA is convincing to achieve optimal structure and ideal weight to maximize the economic and technical benefits. Moreover, lightweight design of machine structural components achieves not only higher kinematic/dynamic precision but also considerable cost reduction. Copyright © 2013 Emerald Group Publishing Limited. All rights reserved. Source


Fu L.,Shenzhen Jinzhou Precision Technology Corporation | Guo Q.,Shenzhen Jinzhou Precision Technology Corporation
Circuit World | Year: 2010

Purpose - The paper aims to present key points regarding the development of an ultra-small micro drill bit for packaging substrate hole processing. Design/methodology/approach - Key points for the development of ultra-small drill bits are presented. These are based on a study of the influential mechanisms of micro drill bit material properties, key parameters and coating techniques on the behaviours of micro drill bit. Experiments were conducted to verify the drilling capability of the developed ultra-small micro drill bits. Findings - The material properties of micro drill bits are of great importance in ensuring the performance. Helix angle, primary face angle and point angle are three key parameters that significantly influence drill bit behaviour. Computer-aided engineering analysis, temperature monitoring and video monitoring techniques in high-speed drilling are useful tools for achieving the optimal design of ultra-small drill bits. Using coating technology on ultrasmall drill bits can improve their hit limits by nearly four times. Originality/value - The paper highlights key points to consider when developing ultra-small micro drill bits. The presented points can provide an overall understanding of the challenges and solutions during ultra-small micro drill bit design. Additionally, this paper presents a solution for packaging substrate ultra-small hole processing by mechanical drilling. © Emerald Group Publishing Limited. Source


Shi H.,Shenzhen University | Song F.,Hans Tech | Fu L.,Shenzhen Jinzhou Precision Technology Corporation
Circuit World | Year: 2011

Purpose - The purpose of this paper is to present a system for accurately measuring drilling force in the printed circuit board micro drilling process and to characterize the drilling force to provide a better understanding of the micro drilling process. Design/methodology/approach - The drilling force measurement system was established first. Then the drilling force in printed circuit board micro drilling process was characterized experimentally. In particular, the drilling forces in drilling halogen-free and lead-free assembly compatible printed circuit boards and the drilling force characteristics in ultra small hole drilling were investigated. Findings - A drilling force measurement system, with the key component of a KISTLER 9256C2 dynamometer, can accurately measure the drilling forces in the printed circuit board micro drilling process. The micro drilling process can be characterized by drilling force. Meanwhile, drilling force is very sensitive to drill breakage and drilling force can be utilized to detect drill breakage in the micro drilling process. Originality/value - The paper presents a system for accurately measuring the drilling force. Drilling force provides fundamental information for the optimal design of micro drill bits. Drilling force can also characterize the micro drilling process, especially the ultra small hole micro drilling process. © Emerald Group Publishing Limited. Source


Patent
SHENZHEN JINZHOU PRECISION TECHNOLOGY Corporation | Date: 2014-07-17

A micro-drill includes a first rake face, a first rear face, a second rake face, a second rear face, a first spiral groove extending from a drill point to a tail of the drill, a second spiral groove symmetrically arranged about the first spiral groove, and a biasing groove arranged in front of the drill point. Where the first rake face, the first rear face, the second rake face, and the second rear face are arranged on the drill point. The first spiral groove and the first rake face intersect to form a first cutting edge, and the second spiral groove and the second rake face intersect to form a second cutting edge. The biasing groove and the second rake face intersect to make a length of the second cutting edge be less than a length of the first cutting edge, and the biasing groove and the second spiral groove intersect each other.

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