August 21, 2018

Advantages of new type carbide blade

With the rapid development of industry, modern high speed machining and automatic machine tools have put forward higher requirements on the performance and stability of cutter. Cemented carbide is widely used in the production of blades due to its advantages of high hardness, wear resistance, strength and toughness, heat resistance and corrosion resistance. The production process of cemented carbide blade (tool) is complex, and the critical process in sand blasting process directly affects the adhesion strength and appearance phase of blade (tool) coating, and plays a decisive role in the service life of cemented carbide blade (tool).

We know that the blade (blade) is an important tool in the machining process. Today, we are going to learn about the classification of blades and the manufacturing process of cemented carbide blades.

A series of transposable square shoulder milling cutters, including multi-function blades. The blade contains four double-sided tip blades. The blade has excellent complete cutting edge and maximizes machining efficiency in various square shoulder milling and milling slots.

The demand of the industry now makes people use more difficult materials to guarantee the mechanical strength at high temperature. Therefore, in order to improve production efficiency, higher processing stability is needed. Tool integration is another issue in the effort to improve tool economy and improve tool life management, in which manufacturers are using a single tool for a variety of different processing applications.

The blade contains a specially designed gap Angle of the rear cutter surface to meet the requirements of slope milling, screw interpolation and other 3 dimensional milling, while ensuring the integrity of the strong tip of the negative Angle blade. The main blade features a large front Angle design that allows free cutting without compromising the integrity of the cutting edge.

The new blades include AH3135 for steel and stainless steel processing and AH120 for cast iron. The characteristics of the two materials are that they have high anti-collapse ability to ensure the processing stability and reduce the premature failure of the blade and blade.

Product advantages:

Multi-function: because the innovative design of the gap Angle of the rear cutter surface can meet the requirements of 3d machining;

Increase efficiency: the integrity of the cutting edge and anti-collapse damage to achieve large feed processing;

Machining stability: the optimized front blade has a lower processing load of machine tool spindle.

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August 17, 2018

Toughening mechanism of layered composite ceramics

The design idea of layered composite ceramics is to add soft and high-temperature materials to brittle ceramics to make layered composite ceramics. Although its composition is simple, the fine composite structure ensures the excellent mechanical properties of materials. Layered composite is a kind of bionic design. The characteristics of these bionic materials can not only improve the toughness of ceramics from the component design, but also design new materials from the macroscopic structure, forming the synergistic effect of multistage toughening mechanism of different scales, which is a new idea of reinforcing and toughening ceramics. At present, the commonly used bionic structure has bamboo and wood structure, shell structure and so on.

Different from traditional methods to improve material properties, such as eliminating defects, the toughening mechanism of layered composite ceramics is independent of strength and defects, and is a defect resistance mechanism of energy absorption and dissipation mechanism. According to the strength of interface, layered composite ceramics can be divided into weak interface, strong interface and ductile interface materials. Different interface combinations correspond to different toughening mechanisms.

A weak interlayer is introduced between two layers of high-strength ceramic substrates. When the stress of layered composite ceramics with a weak interface reaches a certain intensity, the crack grows to form a micro crack, and the micro crack will deflect or laminate along the weak interface, releasing energy in the process of crack growth and achieving the effect of material toughening.

This kind of layeredcomposite ceramics is characterized by a large increase in fracture toughness and no sudden fracture of the material. However, due to the existence of weak interlayers, the overall strength of the material is reduced.

Strong interfacial bond is a kind of interfacial binding force to form mutual restraint between layers, which is beneficial to form strong residual stress in the material. If the residual stress is artificially designed, it becomes prestressed. Strong toughening mechanism of interfacial residual stress by the use of layered composite ceramic substrate layer and interlayer between the thermal expansion coefficient, shrinkage rate does not match, or a layer of phase transformation, adjust their respective layer, layer thickness, the surface layer to produce appropriate compressive stress, thus inhibiting the occurrence and spread of cracks, the material strength, toughness, surface microhardness increase method.

This kind of layered composite ceramics has strong - strong multilayer interface characteristics, which is usually obtained by interlacing and layer by layer superposition of two kinds of strong monomers or composite ceramics.

Ductile interlayer crack toughening is to use the plastic deformation of ductile layer to consume and absorb energy, and form a bridge at the end of the crack to prevent the crack expansion, so as to improve the fracture toughness of the material. Ductility layer can exist in the state of continuous layer and choose organics such as metal or resin with strong plastic deformation ability.


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August 07, 2018

Prices of tungsten products have generally declined

Recently, the market is in a negative situation, and the price of tungsten products has fallen sharply. After the sustained weakening of the previous two weeks, the price has fallen below the support level of the previous forecast, which was mentioned in previous articles. As a result of the market to buy up do not buy down mentality, enterprises are basically in the state of wait-and-see, tungsten market inquiries are scarce, holding miners are also resistant to low-price shipments; The operating rate of powder enterprises is at a low level, and the enquiries for raw materials are reduced.
From the analysis of all the negative factors, we can see that the reasons for the price decline are mainly divided into three aspects: first, supply exceeds demand, second, low added value of products, and third, peripheral market is negative.
The first factor in the decline of tungsten products is the oversupply in the market. After the supply side, first of all, environmental supervision, part of the early production of mines and smelters in succession after rehabilitation, the upstream production increased dramatically, and second, the tungsten industry of industrial concentration is low, although has experienced the market reshuffle prices bottomed out in early 2016, improve the industry concentration, but overall, the concentration degree of the market remains to be improved, it needs to have the strength enterprise to get through upstream and downstream industry chain link, are not specific to this now. On the demand side, influenced by the traditional low season in China and the summer break in Europe, the demand is at a weak level. We continue to make detailed analysis of the reasons for the weak market demand, which are the sluggish growth of the whole terminal consumption sector, including the slowing growth of infrastructure, sluggish sales in the automobile industry, the lack of good performance in the application fields of petrochemical industry, etc., which leads to the insufficient consumption demand for tungsten products in China. At present, the overall market is in the situation of oversupply, which is the root cause of the general decline in current prices.
The second major factor affecting the lack of upward momentum in the price of tungsten products is low added value, which is not obvious in the short term, but in the long term is an important factor affecting the market demand and profits of enterprises. Cemented carbide production technology in China and abroad have a certain gap, still we don't have any advantages in the field of high-end manufacturing, such as space equipment cutting tool in foreign production of the products, when the huge space for the future development space is known to all, but the enterprise products have no way to get involved, can only stand outside the door of industry rapid development. It can be said that without advanced technology, enterprises can not seize the demand to occupy the market, can not directly create profits.
The final factor is the recent negative impact of peripheral markets, such as the sino-us trade war and so on. The market is expected to improve to some extent after the summer.

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August 03, 2018

Manufacturing methods and characteristics of prealloyed powder

Prealloyed powder high pressure atomization method is according to the designed ratio of the tire body, the metal of various components is smelted into alloy in advance before sintering, and then atomized powder is sprayed to obtain the required particle size of the tire body powder. Water atomization or gas atomization can be used in atomization. The gas can be atomized by air, nitrogen or argon gas. The cooling rate is fast. Metal powder of certain size and shape (spherical or irregular shape) can be obtained by adjusting nozzle geometry and controlling atomizing medium and other process parameters.

The prealloyed powder used in ceramic saw blade mainly includes fe-cu-ni-sn, fe-cu-co-sn, fe-cu-co and cu-sn series. This kind of pre-mixed gold powder is characterized by low sintering temperature, fine sintering structure, moderate hardness of the tire body, moderate bending strength and low abrasion of the tire body.

The hardness of the body of the ceramic scraper is high, generally greater than HRB95. Coarse knife requires good sharpness and long service life. It is widely used as the basic alloy fe-cu series, which is characterized by good compaction degree of sintering tissue, high hardness and long service life. Fe-cu-ni-sn series alloy powder is widely used in fine knives with both sharpness and service life. It is characterized by low sintering temperature, high hardness, high densification degree and good abrasion resistance. At the same time, the wear compatibility between the tire body and the diamond is good, and the diamond can keep the proper blade height in the working process.

Cobalt has many superior properties. Such as holding force to diamond, good sintering property, products with high density and good compatibility with other metal powder and diamond tools for the alloy powder has been widely applied, but because of its expensive price, supply channel is not stable, and in the aerospace, defense industry, carbide and the strategic resource status in the battery industry, so in recent years, the development and production of diamond tools pre alloy powder is mainly focused on the generation of cobalt alloy powders, it has the following features:

(1) the prealloyed powder develops towards low cobalt and cobalt free tyres in terms of chemical composition, so as to further reduce cost and improve cost performance.

(2) the usage performance of prealloyed powder is further improved and improved. For example, various methods are adopted to improve the density, impact strength and hardness of pre-mixed gold powder, reduce its sintering temperature, reduce the production of brittle phase, and improve the uniformity of its components.

(3) the product is developed to complete prealloying of the fetal body. Unlike pre-mixed gold powder, which is mainly produced on the basis of pre-mixed gold powder in the early stage of its development, the newly developed pre-mixed gold powder is for specific purposes and does not need to add other powder to fully pre-mixed gold powder body.


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