As early as 1985-1992, Professor Lin Biao and Cao Zhengquan of Hunan University successively published papers on the mathematical model of group drilling and the calculation of sharpening parameters, mathematical model of variable pitch helical surface, and successfully solved the mathematical model of group drilling. The problem provides the necessary conditions for the design of twist drill tip CAD/CAM and high performance group sharpening and sharpening machine. I have also seen Dr. Chen Dingchang, a professor of Beihang University, who led the doctoral thesis of the CNC group grinding and sharpening machine developed over the years. Professor Hu Sijie and other engineers and technicians from Hunan University successfully developed a 5-axis CNC drilling machine in 2004. The emergence of the group of CNC grinding machines has laid the foundation for the modern production of domestic group drills. From then on, it can completely overcome the shortcomings of manual or sharpening fixtures relying on experience to adjust and difficult to achieve accurate grinding.

From 2005 to 2006, in order to solve the drilling task of the nuclear power steam generator pipe support plate of the affiliated factory of Shanghai University of Technology, I further reformed the blade on the basis of the stainless steel chip breaking group drill, after many sharpening and drilling tests. By optimizing the design and calculation of the process parameters, the stainless steel drill type with accurate parameters was successfully grounded by the drill grinder produced by Jinan Botwei, and the effect of stable chip breaking was achieved, realizing a fine drilling of French smelting Z0Cr13. The task of stainless steel plate doubles the work efficiency. In order to summarize and exchange experiences, I published the paper "Scrape Form and Control of Stainless Steel Chip Drills" at the 2nd China Knife Association Cutting Technology High-Level Forum in October 2006, which was well received by the industry, on cutting technology and other websites. Widely circulated.

In the process of group drill optimization design, I found that there are mutual constraints between some parameters of the past multi-blade cusp drills, and some drill types need to supplement the necessary independent parameters to accurately grind them out. Taking into account the design parameters, process parameters in the drill type, and the parameters generated after sharpening, after optimization design, the best rake angle distribution and edge strength can be obtained, which makes the drill centering ability better. The resistance is smaller, the drill tip is sharper, and stable and reliable chip breaking is achieved. I provided these drill type data to Ningbo Huajian Tools Co., Ltd. as the factory standard, named "Huajian Qun Drill" and "Jinhua Blade Group Drill" (see Figure 3), and began industrial production. At the same time, the results of further optimization of the group drill were applied for two utility model patents. On July 8, 2009, the National Patent Office issued an announcement (ZL200820165518.0, ZL200820165519.5).

Figure 3 Huajian Group Drill

In 2007, Huajian Tools Co., Ltd. cooperated with Shenzhen Golden Drill Tool Manufacturing Technology Co., Ltd., I went to Shenzhen twice, based on the drill bit produced by Huajian, using the 5-axis CNC drilling machine developed by the company to accurately grind a batch. “Jinhua Blades Drill” was sent to the testing center of the French company Dvoron in Spain. The conclusion is that it is very good in appearance, precision and cutting. It has become a domestic industrial grade group drill series and entered the international market. A successful attempt.

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Microscope Slides And Cover Slips

1. The glass slide is used to put the sample to be tested, and the cover glass is covered on the sample to be tested.
2. The glass slide is at the bottom, which is the carrier for the material you want to observe, that is, you want to put something on it.
3. The cover glass is smaller than the slide glass. The glass slide is mainly used to hold the observation objects. The cover glass is covered on the slide glass and used for fixing.
4. The glass slide is a thicker piece of glass in the transfer slide, which is used to carry the real object. The cover fragment is the small round or square thin one.
5. Mounting is a general term for a set of things, including slides, coverslips and loaded objects

6. The cover glass is square, the slide glass is rectangular, and the width is longer than the side of the cover glass.