Based on the complex shape of carbide ball milling cutter, it is difficult to prepare by traditional machining method, and the waste of materials will be caused. Preparation of Harbin university of science and technology to the preparation of the micro texture of carbide end milling ball head can get higher dimensional accuracy, but also create unique blade on the knife before - contact model, can be achieved on the contact area to print out from 50 microns to 200 microns in diameter pit micro texture arrays, and dimension precision is very high.

With the formation of tungsten carbide balls head on compared to the method of texture, Harbin university of technology in addition to being able to create complex shapes of ball end milling cutter, also can in front of the ball head milling cutter blade knife - crumbs contact region more precise pits were dimension micro texture arrays, which can achieve cut the knife when cutting chip - crumbs contact area, to reduce the knife - friction coefficient of contact area, to reduce tool wear.

Ball tooth bit is a kind of rock drill bit which appears with the development of hydraulic rock drill. It has high working efficiency, fast drilling speed and saves auxiliary working time. It is suitable for fast driving of high-power rock drill. Ball tooth drill bit in the drilling of brittle rock, with the use of high power hydraulic drill, the biggest characteristic is fast and stable chisel, drill bit grinding cycle is long. Since the 1970s, porter company has been researching and developing ball-tooth bit as its main product. Now, the sales volume of various ball-tooth bit accounts for 60% ~ 70% of the total production of the ball-tooth bit. In 1968, after adopting the precision hot-setting technology, sandvik company developed a series of ball-tooth drill bits with large and small diameter for percussion drilling, and recommended the ball-tooth drill head as the "ideal supporting drilling tool for hydraulic rock drill". In the next few years, ball tooth bit will take more and more proportion in rock drilling bit market.

After the 1980s, China began to pay attention to the research and development of ball tooth bit. In the 1990s, the quantity and quality of domestic ball-tooth drill bits have been greatly developed (table 5), and the export volume is also increasing year by year. A batch of ball tooth bit manufacturers with larger output and better quality appeared, tungsten carbide ball tooth bit produced by lianhuashan takes a large proportion in the export bit.In the production process of ball tooth bit, high quality carbides of shell steel, high precision processing equipment, reasonable processing technology and heat treatment technology are the preconditions to ensure product quality. The ball tooth bit steel used in foreign brazing tool factory mainly USES chrome-nickel-molybdenum steel or silicon-manganese chrome-nickel-molybdenum steel. In the hard alloy aspect, each factory selects the high quality hard alloy, like Sweden DP series alloy, Germany GT series alloy and so on.

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This kind of tungsten carbide sealing ring is made of the same material, the performance of the material is uniform in all parts of the sealing ring, there is no composite sealing ring leakage and separation defects, there is no possibility of electrochemical corrosion. Most soft rings are made of graphite, while hard rings can be made of various alloy steels, such as bearing steel (GCr9), high-speed steel (W18Cr4V) and other alloy steels (such as 1140Cr, 3Cr13, etc.), and some are made of alloy cast iron. (such as silicon, chromium and nickel cast iron). These materials should be supplemented by appropriate heat treatment processes to improve their hardness and wear resistance. These materials cost less and, if used properly, have a longer life. In order to further improve the hardness and prolong the service life, cemented carbide can be used. The commonly used cemented carbide is cobalt-based tungsten carbide with better performance but high price. The price of steel-bonded carbides is lower. In order to improve the corrosion resistance in the corrosive medium, there are nickel-based tungsten carbide, and hastelloy alloy has higher corrosion resistance, but the price is expensive. In addition, there are seals made of silicon carbide and other ceramic materials.

Combination seal ring

Tungsten carbide and other materials have excellent properties, but the high price, difficult processing, limited its use. In order to solve this contradiction, tungsten carbide seal ring  appeared. The sealing end face is made of cemented carbide, and the base of the sealing ring (called ring seat) is made of ordinary materials. In order to solve the connection and sealing between cemented carbide ring and ring seat, there are four kinds of combined sealing rings, which are hot-mounted type, ring-type, welded type and brazing type.

Sealing ring requirements:

Sealing ring is the general name of moving ring and static ring (the same below), is the most important component of mechanical seal. Seal ring to a large extent determines the mechanical seal performance and life, so it put forward some requirements.

1. Sufficient strength and stiffness. Under working conditions (such as pressure, temperature and sliding speed, etc.) is not damaged, deformation should be as small as possible, working conditions fluctuations can still maintain the sealing.

2. The sealing end face shall have sufficient strength and corrosion resistance to ensure a satisfactory service life under working conditions.

3, sealing ring application of good heat shock resistance. Therefore, the material is required to have a higher thermal conductivity coefficient and a smaller linear expansion coefficient, so that it will not crack under thermal shock.

4, sealing ring matching should have a small coefficient of friction and good self-lubrication, sealing ring material and bee fluid should have a good wetting. If short dry friction occurs in the work, the sealing end face will not be damaged.

5, sealing ring should strive to be simple, symmetrical and give priority to the overall structure. Can also be used in combination (such as mount type) sealing ring, as far as possible to avoid the use of sealing end spray structure.

6, sealing ring to be easy to manufacture, installation and maintenance to be convenient, low price.

Seal ring is a ring seal with a gap, by being compressed after the elastic and against the static parts of the inner hole wall sealing role. Sealing ring is a kind of ring seal with a gap, put it in the ring groove of the sleeve, the sleeve and the shaft rotate together, the sealing ring is pressed by the gap after the elastic and against the static part of the inner hole wall, can play a sealing role. All contact surfaces shall be hardened and polished. The sealing ring is made of wear-resisting cast iron containing chromium and can be used for sliding speed less than 100m/s; If the sliding speed is within the range of 60 ~ 80m/s, the sealing ring can also be made of tin bronze.

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With the intensifying of market competition, domestic spraying industry production scale expands unceasingly, and powder coating without solvent and less pollution, saving energy and resources, reduce the labor intensity, and the characteristics of the coating of higher mechanical strength, leading to more and more with the process of the enterprise for powder coating industry, but due to the use of dangerous chemicals is more, there is no lack of among them many of the flammable and explosive, and spraying methods mostly adopt electrostatic spraying method, fluidized bed coating method, electrostatic fluidized bed method, electrostatic oscillation method, electrophoresis method and flame spraying method such as high-energy spraying powder method, so in theory, technical requirements on this, At the same time, there are three conditions of ignition source, air and combustible powder, which can easily cause explosion accident in the spraying workshop. The powder spraying accident is characterized by great destructive power, strong suddenness and great damage to human beings. The prevention and supervision of the accident will bring certain challenges to the safety production area.

China's spraying technology basically exists in the first and second industries, especially the manufacturing and construction industries in the second industry, such as machinery manufacturing, materials production and electrical equipment processing. At present, electrostatic spraying is the mainstream method in China. Taking this as an example, powder spraying technology is generally divided into three steps, namely pretreatment, electrostatic spraying and curing. Pre-treatment mainly includes oil removal, rust removal, phosphating (chromating) and passivation, etc. Common pre-treatment includes immersion type, spray type and waterfall type. Electrostatic spraying is the core of this process, which is generally carried out in a fixed electrostatic powder spraying system, which is mainly composed of a powder feeding device, a set or sets of electrostatic spraying guns, control devices, electrostatic generating devices (usually arranged in the electrostatic spraying gun) and a set of powder recycling devices. Solidification is generally carried out in the drying room, by passing the painted workpiece through the high temperature, so as to make the powder concentrate, level, and solidify the sprayed powder onto the surface of the workpiece.

Due to the different economic conditions of each manufacturer, the equipment used in the pretreatment, spraying and solidification production line is of different quality. Some of them buy individual pieces to assemble themselves; Some of them are designed and made by themselves, and the room where the process is built is also different. Even in the same industry, the process of powder size, spraying methods, production capacity, etc. In the process of production, disorderly equipment, if not strictly controlled, will face huge safety risks.

At present our country has set a safe operation for the coating industry regulations "coating operation safety regulations", a total of 12 of this series, powder spraying area for the layout of the powder and have strict requirements, not only the security objectives ofpowder coating industry, also for the future standard basis is provided for the development of the technology, the new starting point for further provide safe production level.

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The process procedure of spray welding is basically the same as that of spraying. Spray welding has one - step and two - step process.

Attention should be paid before construction:

There is carburized or nitrided layer on the surface of the surface of the surface of the finished workpiece, which must be cleared when pretreatment;

(2) for general carbon steel workpiece preheating temperature 200 ~ 300 degrees and 350 ~ 400 degrees heat resistant austenitic steel. Preheat the flame with neutral or weak carbon flame. In addition, the thickness of spray coating is reduced by about 25% after remelting, which should be taken into account when measuring the thermal state after spray remelting.

one-shot

The one-step method is to spray one section and then melt another section. Can choose medium and small spray welding gun. After the workpiece preheating before spraying 0. 2 mm layer of protection, and the surface densification, prevent oxidation, spraying molten starting at one end, spray from 10 to 30 mm, to cover local heated to melt in order to start again when wet flow (can't) spray welding powder, melt and repeated, until it reaches the thickness, surface reflective "mirror", further extension, reached a surface covering all spray welding layers. If the thickness is insufficient, the thickness can be increased repeatedly. One-step method is suitable for small parts or small area spray welding.

Step two spray welding

The two-step method is to finish the coating layer before remelting it. Both spraying and remelting are used with high-power spray guns, such as sph-e spray and welding guns, to fully melt the alloy powder in the flame and generate plastic deformation of the deposited layer on the surface of the workpiece. Weak carbon flame is used when spraying iron base powder while neutral or weak carbon flame when using spraying welding powder and cobalt base powder.

The thickness of each layer of powder spraying is <0.2mm, and the repeated spraying reaches the remelting thickness. Generally, the remelting can be performed from 0.5-0.6mm. If the spray welding layer is required to be thicker, a remelting can not reach the requirements, several times of spraying and remelting.

Remelting is a key step of the two-step process, which takes place immediately after spraying. With a neutral flame or weak carbonizing flame of high power soft flame spray from about 20 ~ 30 mm, flame and surface Angle 60 ~ 75 degrees, start from about 30 mm from coating, appropriate master remelting speed, heat the coating, until a "mirror" reflective coating for degrees, and then go to the next part of remelting.

During remelting, overmelting (i.e. surface cracking) should be prevented, coating metal flows, or local heating time is too long to oxidize the surface. Multilayer remelting, the previous layer cooled to about 700 degrees, cleared surface slag, make secondary spray welding. Remelting should not exceed 3 times.

Cooling of workpiece. Medium and low carbon steel, low alloy steel workpiece and thin welding layer, simple shape of cast iron parts cool naturally in air. For iron parts with thick welding layer and complex shape, alloy steel parts with high content of manganese, copper and vanadium, and parts with high cold hardness, they should be buried in the pit of lime.

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Among the nozzles, the tungsten carbide nozzles are the most durable and cost-effective. Cemented carbide nozzles are made from precision machineries and superhard alloy materials. The hardness of cemented carbide nozzle can reach 2300N/mm and HRA90 degree.

Cemented carbide nozzles are formed by hot pressing and sintering of hot straight holes and churns. In the process of machining, precision grinding and surface treatment must be achieved, and the roughness of hole is Ra0.1 and that of both ends R is Ra0.025. A scientific design with a radius of curvature at two entrances.

This design ensures smooth thread passage. The advantages of carbide-tipped nozzles are hardness, low density, abrasion resistance and corrosion resistance. So carbide-tipped nozzles are widely used in sandblasting and shot blasting equipment, ensuring the product is used for a long time in the best air and abrasive.

The shape of the carbide nozzle bore determines the flow pattern. Carbide nozzles usually have a straight hole and a small hole.

Straight orifice nozzle for the airflow field or the internal airflow work to form a sealed airflow pattern. This is conducive to the realization of small work, used for cleaning parts, weld molding, cleaning handrails, steps, lattice, or stone carving and other aspects.

The pile-nozzles form a full air flow pattern, increasing the grinding speed by up to 100% for a given pressure. Venturi nozzles are the best choice for increasing productivity on larger airflow surfaces. Compared with the straight hole nozzle, the long hill nozzle can increase the productivity by 40% when the abrasive consumption is about 40% less.

Cemented carbide nozzles are also called cemented carbide nozzles, tungsten steel nozzles, tungsten carbide nozzles, etc.cemented carbide nozzles production and processing customization, specializing in the soldering of tin ball laser, supporting equipment customers require custom-made processing of tungsten steel nozzles.

Cemented carbide nozzles are also called tungsten carbide nozzles. Commonly used is cemented carbide, tungsten cobalt alloy, tungsten cobalt alloy is a refractory metal tungsten carbide as hard phase, with transition metals (Co, etc.) as the binder phase, using powder metallurgy technology preparation production of superhard materials, has high strength, high hardness, wear resistance, corrosion resistance, high temperature resistant, and the advantages of small linear expansion coefficient, extensive application in many industrial production and processing operations, is one of the excellent tool material. Because its main component is tungsten carbide, foreign product demand is often called tungsten carbide product, we call it cemented carbide product.

Good physical stability, especially when high temperature and corrosion resistance require long-term operation, the excellent performance of tungsten carbide nozzles, cemented carbide nozzle and precise suction nozzle is beyond the reach of other tool materials. Cemented carbide produced by powder metallurgy production process is a typical representative of super hard metal because of its high hardness, high strength and good toughness, and is a good choice of wear-resistant parts.

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Posted by: hannahgwendolyn at 09:35 AM | No Comments | Add Comment
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Background technology:

In everyday life, we have a nozzle on the faucet, on the one hand, have the effect of make water to the nozzle, on the other hand the internal filter can also filter effect, because the water is the direct impact of filter, time is long water flow in the dirt and gravel will filter blockage, and we sometimes when mixing cold and hot water, can produce nozzle flow of water is as cold and general heat mixing unevenly, so designing a tungsten carbide nozzle, aiming at the above problems is very necessary.

Technical implementation elements:

In view of the above problems, the utility model provides tungsten carbide nozzles, the utility model by adding the mixing with rotating filter can mix hot and cold water rapidly, at the same time can also be fall into filter dirt and sediment left edge of the web site, to avoid congestion, between which can effectively solve the problem of technical background.

To achieve the above purpose, the utility model provides the following technical scheme: a kind of tungsten carbide nozzles, including nozzle and nozzle, the nozzle and nozzle described connected, as described in the bottom of the nozzle is equipped with filter, filter unit including fixed ring frame and screen pack, described the fixed ring frame has raised, net is described in the outer ring is equipped with card slot, described in the card slot card and on the trunk, described in the filter connected with center rod end, described the center stem with stirring piece, described the center rod at the other end connected with drive motor, the drive motor on the nozzle.

As an optimal technical scheme of the utility model, the fixing ring frame is connected with the nozzle through the thread.

As an optimal technical scheme of the utility model, the length of the stirring plate is smaller than the radius of the sprinkler head.

As an optimal technical scheme of the utility model, the driving motor is provided with a protective case.

As a preferred technical scheme of the utility model, the stirring plate and the filter net are made of stainless steel.

Compared with the existing technology, the beneficial effect of the utility model is: The utility model through tungsten carbide nozzles with fixed ring frame with filter, filter with fixed ring is to link with convex card and form through the card slot, not rigid fixed connection, so the filter can rotate, rod through the drive motor drive center can achieve filter and rotate at the same time, of the stir when water flow for the nozzle, as the filter is rotating, can take advantage of the centrifugal force will be on the dirt or mud into the edge of the above, in addition when cold water and hot water reaches the nozzle flow, mixing, stirring slice can mix cold water and hot water quickly, there will be no general hot water general conditions in the cold water, The utility model can mix hot water and cold water rapidly through the added stirring plate and rotating filter net, and at the same time can throw the dirt and sediment into the filter net to the edge to avoid the blockage among them. The overall design is simple and practical with low cost and broad market prospect.

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Posted by: hannahgwendolyn at 09:10 AM | No Comments | Add Comment
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