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　　If you are not happy with your facial parts or the outline of your face, then you can alter it or enhance it to feel better in your body. They operate on maximum number of people in a month that any plastic surgeon anywhere else across the world can get to do. Plastic surgeons who are more experienced and handling maximum number of cases can be surely trusted upon. You have the right to look attractive and beautiful. South Korea is known to b the “Plastic Surgery Capital of the World”. South Korea Plastic Surgery done by expert surgeons there, in reputed clinics can hardly go wrong. This way naturally the plastic surgeon gets more exposed to cases every month, which accelerates their experience and sharpens their expertise as reliable plastic surgeons. Human society welcomes readily those who are rich, powerful, beautiful etc. People from all the neighboring nations as well as from distant continents have been reported to come here for cosmetic enhancement..

In addition to their clients that they get within their own country, the foreign-based medical tourist also visits them for surgeries.Popularity of South Korea Plastic Surgery South Korea is thronged by a wider spectrum of masses, to get their beauty flaws addressed by plastic surgery science. South Koreans themselves are known to be the most beauty conscious people, who would not mind getting surgeries done on their face and facial parts to look attractive. Seoul, in South Korea attracts maximum number of medical tourists all through the year. However, do see that they are not busy to that extent, where they cannot give proper attention to your concerns and treatment. The surgeons, practicing in South Korea happens to be the most experienced ones in plastic surgery field. South Korea Plastic Surgery has helped to boost it' economic growth, by helping a myriad of several people to get rid of their beauty flaws through surgical or non-surgical cosmetic treatments. These medical tourists come especially to address their cosmetic concerns, Storage tank cylinder through surgical or non-surgical cosmetic treatment methods, available here. Look for a plastic surgeon who is trustworthy, experienced, has reputation as reliable plastic surgeon but also professional enough to not neglect looking after your issues and requirements as patients for being too busy. About the Author:

Synergy Plastic Surgery Clinic is a professional Writer who likes to write about all affordable plastic surgery topics.It is a fact from a very reliable source, telling medical tourism, basically revolving around plastic surgery, has contributed to the country' GDP and overall economic growth in a considerable manner. This is not just a hyperbolic expression but very much a fact. This is the reality so start getting practical and act accordingly. This way the South Korean plastic surgeons can gain impressive experience, compared to their counterparts, practicing in other parts of the world. It is a proven fact and a statistical figure also that says around 60% of people, inhabiting South Korea, opt for plastic surgery or cosmetic treatment, at least once in their lifetime. He shares all facial contouring, Plastic Surgery Clinic Korea , Plastic Surgery Cost in Korea, Nose Surgery in Korea, Canthoplasty Surgery more ideas. A lot many people visit this country for doing plastic surgery or for availing non-surgical cosmetic treatments also, because this is world famous for plastic surgery

　　Nitriding and carburizing the surface of steel products can improve the mechanical properties of the surface of steel products. The stainless steel with excellent corrosion resistance containing Cr has a problem of poor wear resistance. However, using the above surface treatment methods may affect the original corrosion resistance of stainless steel. In this study, high-temperature nitrogen solution treatment was applied to ferritic stainless steels, proving that the surface hardness and corrosion resistance of high-temperature nitrogen solution treatment ferritic stainless steels were improved. Compared with austenitic stainless steels, martensitic stainless steels have higher strength but poorer corrosion resistance. In this study, martensitic stainless steel was subjected to high-temperature nitrogen solution treatment, and the experimental research results are as follows. 1

Test method The test steel is commercially available martensitic stainless steel SUS420J2. The test steel is made into a semi-cylindrical specimen of φ25mm × 8 (mm). After grinding the surface of the gear shaft Manufacturers sample with # 800 emery sandpaper, degrease and clean with acetone. Use industrial vacuum heat treatment furnace for high temperature solid solution nitrogen treatment. The treatment method is to replace the atmosphere in the furnace with nitrogen, then heat the sample to 1100 ° C for heat preservation, and then cool with nitrogen. After that, the samples were subjected to sub-zero temperature treatment. Next, the samples were tempered at 160, 400, 450, 500, 550 ° C and annealed at 850 ° C. The micro-Vickers hardness was measured on the cross-section of the treated sample, and the micro-structure observation of the cross-section, X-ray diffraction test and pitting corrosion potential were measured. In addition, for comparison, the commercially available SUS420J2 rolled steel was quenched at 1035 ° C, and then tempered at 160 ° C to produce a quenched and tempered material. 2 Test results The cross-sectional hardness and microstructure of the 160 ℃ tempered material after high-temperature nitrogen solution treatment are shown in Figure 1. The maximum value of the cross-sectional hardness of the 160 ℃ tempered material is 720HV, the maximum hardness retention depth is 0.25mm, and the hardness is higher than the base steel About 50HV higher. The surface layer and matrix of the tempered material at 160 ° C are both martensitic. From the microstructure, the boundary of the nitrogen hardened layer cannot be determined.

The cross-sectional hardness of each tempering temperature material shows that the cross-sectional hardness of the tempered material at 160-550 ℃ is gradually reduced from the surface to about 0.8mm from the surface, and the cross-sectional hardness of the annealed material at 850 ℃ is about 220HV from the surface to the substrate ,Little change. The microstructures of the cross-sections of the 400 ° C tempered material and the 850 ° C annealed material show that nitride precipitates were observed from the surface of the 850 ° C annealed material to 0.8 mm from the surface. This nitride is a nitride precipitated by the combination of N and Cr when martensite is transformed into ferrite during annealing. X-ray diffraction results of tempered materials at different temperatures, tempered samples, and materials without nitrogen solution treatment after nitrogen solution treatment show that α (ferrite), α '(Martensite), γ (Austenite). There are α and α 'in 500 ° C tempered materials. There are α, α ', β-Cr2N and Cr23C6 among the materials not subjected to nitrogen solution treatment and the 850 ° C annealed material. The polarization curve of each tempered material shows that the pitting corrosion potential of the tempered material at 160 ° C and the tempered material at 400 ° C is higher than that of the material without nitrogen solution treatment and tempered material. And the tempering temperature increases and the pitting corrosion potential decreases. The SUS420J2 and SUS430 pitting potential changes with tempering temperature shows that the corrosion resistance of SUS420J2 nitrogen solution treatment, 160 ℃ tempered material and 400 ℃ tempered material is better than that of non-nitrogen solution treated material and nitrogen solution treatment Tempered wood. The change trend of the relationship between the tempering temperature and pitting potential of SUS420J2 is the same as that of SUS430, but the pitting corrosion potential of SUS420J2 at each tempering temperature is about 0.15V lower than that of SUS430. 3. Summary The industrial vacuum heat treatment furnace was used to conduct nitrogen solid solution treatment test on SUS420J2 material, and the following conclusions were drawn.

The maximum hardness of SUS420J2 nitrogen solution treatment material is 720HV. From the surface to the range of 0.8mm from the surface, the hardness of SUS420J2 nitrogen solution treatment material is higher than that of the substrate. (2) The SUS420J2 with nitrogen solution treatment and tempered at 160 ℃ and 400 ℃ has better pitting corrosion resistance than SUS420J2 quenched and tempered materials.

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　　Hydraulic casting is one of the casting blanks with complex inner cavity shape, dense material requirements and difficult manufacturing. The author is engaged in the process design and manufacturing of hydraulic castings in Yuci Hydraulic Co., Ltd., and summarizes the process design of two types of castings, such as multi-way valve body castings and pin-type vane pump valve disc castings. Hydraulic castings mainly include hydraulic valves, hydraulic pumps, motors, hydraulic cylinders and other castings. Hydraulic cylinders are relatively simple, and the cavity of hydraulic valve castings is complex. The most difficult to manufacture is the production of multi-directional valve valve body castings; The most difficult production of night pressure pumps and motor castings is the production of valve disc castings in vane pumps. If you master the process design and production rules of the two types of castings, such as the directional valve body and the valve plate, you can easily grasp the process design and manufacturing of hydraulic castings.

The following is a multi-way valve body casting. The resin sand core produced by this process scheme has high overall strength, strong bending resistance, accurate groove size, and greatly improved casting quality. It is the resin sand core diagram of the multi-way reversing valve body casting. It can be seen that the left, bottom, and right parts in the figure are the core head of the integral frame resin sand core. This design idea makes the resin sand core form an integral frame structure. , The strength of the main core is improved, and the bending performance is enhanced (the sand core A cannot be released from the mold, and it is assembled with the main core in the form of a riding core) to ensure the production quality of the valve body casting of the multi-directional valve with elongated valve holes. The frame structure of the sand core frame core head process design of the multi-way reversing valve body assembly can be formed integrally or in combination. It is an assembled frame core structure. For framed core head structure formed by lower frame assembly, see a. For framed core head structure formed by left and right frame assembly, see b. (A) Assembled by lower frame (b) Framed core head by left and right frame assembly. Structure frame core head structure Assembled frame core head structure 1.2 Multi-way directional valve body casting casting system process design The directional valve body casting has a thin wall thickness, and the valve body withstands high hydraulic pressure during use. The material is HT300 .The casting system of this type of casting adopts hot riser and is designed according to the principle of sequential solidification.

The structure of the casting system shows opinions. Schematic diagram of the casting system of the reversing valve body casting. Straight runner 2. Straight runner seat 3.4. Cross runner 5. Slag block runner 2 pin-type vane pump valve disc casting process design for PEF pin-type vane pump valve disc casting blank drawing. The blank has a maximum diameter of 90mm, a height of 33mm, a mass of 1.04kg, and a material of QT500. It can be seen that the size of the piece is small, the structure of the inner cavity is complex, and there are many oil ports. According to the use of the vane pump, if the valve disc casting The poor symmetry and poor accuracy of the oil window size will cause the vane pump to be noisy, low cast bushing suppliers in pressure, and reduced in performance. The casting blank of the valve plate is made of resin sand shell, and the inner cavity is made of resin sand metal core box. In order to make the size of the oil window of the casting high symmetry and accurate size, it was decided to make the integral sand core of the distribution disc casting cavity, for this purpose, a scheme was designed to integrally form all the oil ports in the cavity on a disc core As shown in the design of the sand core structure of the distribution disc, this solution solves the problem of high noise of the PEF pin type vane pump and improves the performance of the PEF pin type vane pump.

Due to the small size and uniform wall thickness of the casting disc disc core, the casting system uses a blanking casting process with a blank width of 3mm and a blank length of 2530mm. The castings produced by this scheme have stable quality and good results. 3 Conclusion The valve body casting of the multi-way valve with slender valve hole adopts the frame structure to design and manufacture the cavity technology. The complex distribution disc casting adopts the disc-type integral sand core structure for the cavity-shaped process design and manufactures the castings with high quality and high pass rate.