Innovation promotes the industrialization of group drilling

High-speed steel twist drills are the most used drilling tools for industrial and civil use. Twisted diamonds have been in existence for more than 100 years, but their basic shapes have been significantly improved. In the 1950s, the group represented by Ni Zhifu invented the group drill, and the drill tip of the ordinary twist drill was ground into the shape of “three-point and seven-blade” (Fig. 1), which greatly improved the performance and cutting life of the drill bit. At the domestic and international cutting circles, it caused great repercussions. Comrade Ni Zhifu caused a sensation when he went to Eastern Europe to perform group drills. However, the group drilling type is complicated, and it is difficult to realize industrial production by manual grinding, which undoubtedly limits the wide application of the group drill.

a. drilled steel drill	b. Drilling cast iron with group drill	c. Multi-chip flute group drill	d. Cross dressing drill	e. Double back angle group drill
Figure 1. Two types of drill tip forms for different types of group drills (a to c) and ordinary drill bits

In the 1990s, the technical team directed by Dr. Wu Xianming, a Chinese-American tool expert, developed a multi-blade drill bit with a multi-blade drill bit and a sharp-edged CNC grinding machine for Irwin, USA, and introduced a multi-blade drill bit. At the beginning of this century, Hainan Gaochao Drill Co., Ltd. of China designed special equipment to realize the high-efficiency, high-precision and low-cost industrial grinding of multi-blade drill bits, which broke the bottleneck of industrialization of group drills. However, in order to truly build a group of diamonds, we must make in-depth efforts in the raw materials, manufacturing processes, surface coatings and further innovation of the drill type.

Domestic superior technology, promote the industrialization of group drilling technology with independent intellectual property rights in China. In January and March 2004, China Machinery Industry Metal Cutting Tool Technology Association held a group drill industrialization seminar at Hunan University and Jiangsu Tiangong Tools Co., Ltd. Meeting and coordination meeting. The heads and experts from Tiangong Tools, Hainan Gaochao, Hunan University, Wuhan University, Beijing Institute of Technology and other enterprises and universities attended the meeting. The students who were invited to attend the meeting were also Professor Wu Xianming's students and developers of American multi-blade sharp drills. American Chinese Dr. Shazilun. The participating parties reached the “Outline of Implementation of Group Drilling Industrialization”. The overall idea is to strengthen cooperation and integrate domestic mature advanced technologies in high-speed steel materials, drill bit manufacturing, drill type optimization, and drill tip grinding, and accelerate the promotion group. Drilling industrialization process. The parties reached a number of cooperation intentions, Tiangong Tools Co., Ltd. invested 200,000 yuan to establish a group drilling industrialization fund to support industrialization coordination and technology development work.

Figure 2 Hainan Gaochao Bit Co., Ltd.

Three years have passed, following the overall thinking of the implementation outline and the joint efforts of all parties concerned, the technological innovation and industrialization of the group drills have made gratifying progress.

Based on the 67-group drill, multi-faceted innovations (see Table 1 and Figure 2) have been developed to make the drilling more brisk and better centered. It can drill steel plates and drill deep holes, and can drill both steel and drill. High-grade I and high-class II group drills of non-ferrous metals. They also developed corporate standards and worked with bit manufacturers to bring multi-blade sharp-drill products to the international market in batches.

Jiangsu Tiangong Group developed the second generation of new multi-blade sharp-drilled products with its advantages of high-speed steel materials and drill bit manufacturing. It lives in Europe with its own brand of “TG” (commercially recognized trademark in China in 006). The added value has also been greatly improved.

As cutting technology advances, the market share of carbide tools, ceramic tools and superhard tools continues to increase. High-speed steel cutters still have advantages in manufacturing complex tools, hole machining tools and some easy-to-work hardened materials due to their good toughness and sharp edges. Therefore, it is not comprehensive to regard high-speed steel twist drills as low-grade tools. of. The world-famous Guhring and Titex are producing high-speed steel drill bits. Industrial-grade, professional-grade and civilian high-speed steel drill bits have a huge market in Europe and the United States, and Boeing, the world's largest aircraft manufacturer, also uses twist drills. The key is to strive to improve the quality of domestic twist drills, provide high-performance products for the domestic processing industry and enter the European and American industrial products market. Hainan Gaochao and Jiangsu Tiangong's achievements in the industrialization of group drills are worth learning from.

The industrialization process of the group drills has to be further developed. We must gather domestic first-class technical teams, carry out extensive technical cooperation, and establish a group of drill industrialization bases; from a single drill tip innovation to a comprehensive innovation of trough, structure, materials and manufacturing processes; Twist drill bits, new multi-blade drill bits with a shape that is clearly different from existing drill bits are introduced to the market and pushed to the world, making due contributions to revitalizing China's tool industry and building a manufacturing power.

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