NEWS_NEWS_Zigong Dingli Alloy Material Co. Ltd

11-01 

The tube is an industrial tooth in tungsten steel industry, which is widely used

1.As a typical representative of super hard metals, hard alloy as an industrial tooth, its wear resistance, corrosion resistance and high hardness, high strength characteristics make it widely used, especially some special work in the extreme environment of the core working parts, such as oil and gas, automobiles, ships, iron and steel mines and other scale industrial production. Good performance and long service life are effective ways to improve the efficiency of industrial production. Zigong Dingli alloy Material Co., LTD. Self-produced and self-sold carbide pipe and custom production and processing, according to customer's drawing requirements of production and processing. The conventional carbide tube dimensions are as follows: 1. Maximum diameter 74 mm, 2. Minimum diameter 5mm, 3. Maximum diameter 68 mm, 4. Minimum diameter 0.1mm, 5. The maximum length of carbide tube is 360mm 2.For those of you who use cemented carbide tubing, the following are some of the specifications for regular production: 1. Phi phi is 16 * 1.5 * 330 2. Phi phi phi 18 * 2 * 330 3. Phi phi 20 * 2 * 330 2 x330 25 * 4. Phi phi 28 * 3 5. Phi phi 330 6. Phi 32 * 3 * 330

05-09 

Milling cutter material requirements

Basic requirements for folding milling cutters to cut parts of material 1) High hardness and wear resistance: at room temperature, the cutting part of the material must have enough hardness to cut into the workpiece; With high wear resistance, the tool does not wear, prolong the service life. 2) good heat resistance, cutting tool in cutting process will produce a lot of heat, especially at higher cutting speed, the temperature will be very high, therefore, the cutting tool material should possess good heat resistance, both remained high hardness at high temperature, has to continue cutting performance, this is the nature of the high temperature hardness, also known as hot hard or red hardness. 3) high strength and good toughness: in the cutting process, the tool to withstand a lot of impact, so the tool material to have a high strength, otherwise easy to fracture and damage. Because milling cutter will be impacted and vibrated, therefore, milling cutter material should also have good toughness, it is not easy to collapse edge, broken. Folding milling cutter common materials 1) High speed tool steel (referred to as high speed steel, front steel, etc.), divided into general and special purpose high speed steel two kinds. It has the following characteristics: A, high content of alloy elements tungsten, chromium, molybdenum, vanadium, quenching hardness up to HRC62-70. It can still maintain high hardness at 600℃. B, good edge strength and toughness, strong vibration resistance, can be used to manufacture cutting speed of general cutting tools, for poor rigidity of the machine tool, the use of high speed steel milling cutter, can still smooth cutting. C, good process performance, forging, processing and grinding are relatively easy, but also can manufacture more complex shape of the tool. D, compared with cemented carbide materials, it still has the disadvantages of lower hardness, red hardness and poor wear resistance. 2) cemented carbide: metal carbide, tungsten carbide, titanium carbide and cobalt based metal binder by powder metallurgy process. Its main characteristics are as follows: A, can withstand high temperature, around 800-1000℃ can still maintain good cutting performance, cutting can choose 4-8 times higher than high-speed steel cutting speed. B, high hardness at room temperature, good wear resistance. C, low bending strength, poor impact toughness, the blade is not easy to grind very sharp. Commonly used cemented carbide can be divided into three categories: Tungsten cobalt cemented carbides (YG) Commonly used brands YG3, YG6, YG8, in which the number represents the percentage of cobalt content, the more cobalt content, the better toughness, the more impact and vibration resistance, but will reduce the hardness and wear resistance. Therefore, the alloy is suitable for cutting cast iron and non-ferrous metals, and can also be used for cutting heavy impact blank and hardened steel and stainless steel parts. Titanium cobalt cemented carbide (YT) Commonly used grades are YT5, YT15, YT30, the number represents the percentage of titanium carbide. Carbide containing titanium carbide, can improve the bond temperature of steel, reduce friction coefficient, and can make the hardness and wear resistance slightly increased, but reduce the bending strength and toughness, make the quality of brittle, therefore, this kind of alloy is suitable for cutting steel parts. General cemented carbide In the above two kinds of hard alloy to add just the right amount of rare metal carbides, such as tantalum and niobium carbide carbide, make its grain refining, improve its hardness under normal temperature and high temperature hardness, wear resistance, bonding temperature and oxidation resistance, can make the toughness of the alloy increased, therefore, this kind of hard alloy cutter has good cutting performance and generality, Its brands are :YW1, YW2 and YA6, etc., because its price is more expensive, it is mainly used for difficult processing materials, such as high strength steel, heat resistant steel, stainless steel and so on.

04-20 

April 19, 2022 Cobalt lithium nickel market

April 19, 2022 Cobalt lithium nickel market The cobalt price is stable and has a slight correction. Recently, the liquidity of the domestic market is relatively slow due to the impact of the epidemic, the supply side is limited by geographical pressure and logistics capacity, and the demand side is generally in a general mood due to the slowdown of consumption in electric vehicles and alloys. Market overall trading sentiment remains cautious, local talks have loosened, wait-and-see macro news shock. Lithium prices remain a stalemate, industry is still positive for the medium and long term power energy storage consumption expectations, but the recent geopolitical conflicts and epidemic repeatedly caused supply chain disruption, resulting in limited production and operation activities of automotive companies, affecting the upstream lithium material consumption reduction, part of the product price from a small adjustment. However, due to the current lithium supply is still in the tight range, the overall bottom of the market is still strong. Nickel prices relatively stable, is mainly due to the conflict between Russia and Ukraine under the background, the international market of nickel raw material supply insufficient still, superposition of the main changes in the economic and trade measures, the futures market is still in the game, there's more uncertainty and risk, firms trading cautious, wait-and-see stainless steel and the electric car market demand.

04-15 

Application of cemented carbide: domestic shield machine exported to Portugal for the first time

On April 6th, a "cloud acceptance" across thousands of miles was held in Tianjin Dongjiang as promised. The earth pressure balance shield machine manufactured by China Railway Equipment, a state-owned enterprise, successfully passed the acceptance of overseas customers. This is the first time that China's shield machine is exported to Portugal. Shield tunneling machine is a kind of tunneling machine using shield tunneling method. It is closely related to cemented carbide, which is known as "industrial tooth", that is, cemented carbide is the preferred material for cutting tools of high-performance shield tunneling machine. Cemented carbide is a hard compound by refractory metal such as tungsten carbide, niobium carbide and binder composed of elements such as metals, such as cobalt, nickel alloy material, high hardness, high wear resistance, high strength, strong shock resistance, good toughness and heat resistance and corrosion resistance, so better than other materials such as steel manufacture tool is more suitable for application in the shield construction machine. The basic working principle of the shield machine is that a steel component of a cylinder pushes forward along the axis of the tunnel while excavating the soil. It is mainly used for subway, railway, highway, municipal, hydropower and other tunnel projects. Due to the harsh working environment of the shield machine, that is, the external water pressure and formation pressure is large, it is easy to cause the wear and scrap of the shield cutter head. This also requires the shield cutter head to have high enough hardness, strength and toughness. It is understood that the performance of hard alloy shield cutter is closely related to the ratio of raw materials, the morphology and particle size of raw materials. Under normal circumstances, the higher the content of tungsten carbide, the higher the hardness of cemented carbide tool, the worse the toughness; The more complete the crystal shape of tungsten carbide particles and the larger the grain size, the better the toughness of alloy tools. At present, China's tungsten carbide grain size has been able to achieve 9 microns, which makes China's production of hard alloy toughness and wear resistance to reach the international advanced level. It is reported that the Portuguese import of China's shield machine is the main reason for the country to build a drainage tunnel project. The drainage tunnel project is a single-track tunnel, divided into two sections, with a total length of 5.5 km and a maximum rock strength of 135 mpa. According to the characteristics of the project, China Railway Equipment not only optimized the cutter head of shield machine, but also equipped with advanced control system, so that the whole machine can meet the requirements of soft soil layer and rock tunneling. The equipment is expected to be disassembled and shipped in May.

04-08 

The difference between high speed steel milling cutter and carbide milling cutter

The raw materials used in the two milling cutters are different, and the production process is different. Tungsten steel milling cutter material is carbide, commonly known as tungsten steel. The raw material of high speed steel milling cutter is high speed steel. Carbide cutter is generally made of carbide round bar stock, common is to use CNC tool grinding machine for processing equipment, diamond grinding wheel for machining tools, by computer or G code editor processing route and a molding, this way of processing with high efficiency, high precision and mass production as well as good consistency, the disadvantages for most devices for imported products, The general price is more than 1 million yuan. There is processed using ordinary equipment, divided into grinding groove machining spiral groove, end teeth, tooth machining end end, after the qing machine (weeks tooth machine) weeks of tooth, this product need to press all section separately carry on the processing, the amount of manpower cost is high, mass production and the quality of the products are all want to rely on workers own proficiency in operating the machine to control, So it's going to be a little bit less accurate and consistent. In addition, the quality of cemented carbide milling cutter depends on the grade of the selected cemented carbide materials, generally according to the processed materials to optimize the alloy grade, generally speaking, the smaller the grain of the alloy, the better. The difference between high speed steel milling cutter and hard alloy is that high speed steel needs to go through heat treatment process to improve its own hardness, ordinary steel no matter what steel as long as it is not heat treatment, its own is soft. M42 high speed steel and M7 high speed steel are popular in the United States. M42 high speed steel has the best comprehensive performance, whether grinding, hardness and red hardness are very good, but M42 high speed steel contains 8 cobalt, cobalt is a scarce non-renewable resource, so the price of M42 is very expensive, generally between 300,000 and 200,000. Of course, individual recycled material production of domestic M42 will be cheaper, in addition to the popular domestic W18,M2,W9, general high speed steel and M2AL,W9AL and other high-performance high speed steel, which focuses on the INTRODUCTION of M2AL and W9AL, as the name implies, the two brands of high speed steel is on the basis of M2 and W9 add aluminum production. Aluminum ACTS as binder, the particles of steel tightly together, so that the quality of the steel is good, especially the M2AL is specially developed in our country instead of M42 high-speed steel, made of this kind of high speed steel cutting tools in the 80 s, popular with the overseas market, but along with the market competition and high speed steel excessive use of recycled material to produce, This kind of steel now performance is still worse than M42, but for some requirements are not particularly high processing materials, M2AL is a good choice, after all, much cheaper than M42. Cutter coating Coating on the milling cutter surface generally has about 3 μ thickness, the main purpose is to increase the milling cutter surface hardness, some coating can also reduce the affinity with the material being processed. In general, milling cutter in toughness and hardness is not both, and the emergence of coating technology to a certain extent to solve this situation, such as milling cutter matrix selection of high toughness of the raw material, coated with high hardness on the surface of the coating, so that the performance of milling cutter is greatly improved.