High standard 6200 ball bearing

Technical regulations for safe operation. The lifting machinery files include: 　　 (1) Lifting machinery factory technical data, product qualification certificates, operation and maintenance instructions, drawings of vulnerable parts, electrical principles, electrical appliances Component layout drawings, necessary safety accessories type test reports, supervision and inspection certification documents and other relevant materials.

The management system should have the following content: 　　 (1) Emergency rescue plan for crane accidents.　　(6) Management, operation and maintenance personnel training and assessment system.　　 (2) The job responsibility system of functional management departments and drivers.　　2.2 Safety Management System of Lifting Machinery 　　To ensure the safe operation of lifting machinery, there must be a sound management rules and regulations, so that operators have rules to follow and managers have laws to follow.　

　(7) Maintenance and inspection records of special equipment and safety accessories, safety protection devices, measurement and control devices and related auxiliary instruments and meters.　　(7) Operator handover system.1 Safety technical files Lifting machinery use enterprises shall establish and improve equipment safety technical files.　　(3) Acceptance certificate or periodic 'inspection report' issued by special equipment inspection agency.　　

(8) The safety technical archives Mechanical Bearing 609 management system of lifting machinery. According to the use of special equipment of the unit, determine possible failures, dangers, and accidents, and formulate response measures suitable for the characteristics of the unit's lifting machinery.　　 (4) Daily maintenance, maintenance, overhaul, transformation, alteration, inspection and test records.　　(4) Maintenance, overhaul, transformation, and scrap system.　　(6) Equipment safety evaluation by the superior authority..　　(5) Equipment accidents, personal accident records.　　 (2) The technical data required during the installation process, the installation location, and the activation time.2. 

In terms of heat treatment process, it has developed from car hearth fuace and bell fuace to continuous controllable atmosphere annealing fuace heat treatment. Through controlled rolling or rapid cooling after rolling, the network carbide is eliminated, and a suitable preliminary structure is obtained, which can shorten the spheroidizing annealing Mechanical Bearing 608 time of the bearing steel, refine the carbide, and improve the fatigue life.

Developed high-frequency hardening bearing steel, using ordinary medium-carbon steel or medium-carbon manganese, chromium steel to replace ordinary bearing steel through high-frequency heating and quenching, which not only simplifies the production process, reduces the cost, and increases the service life. After rolling, air cooling and short-time annealing are adopted, or the spheroidizing annealing process is completely eliminated, and a qualified bearing steel structure can be obtained. How to obtain the spheroidization structure is an important issue in the production of bearing steel, and controlled rolling and cooling is an important production process for advanced bearing steel.

There is an urgent need to develop good processing performance, low cost, and fatigue. Bearing steel generally develops towards high quality, high performance and multiple varieties. In order to reduce the oxygen content of bearing steel, smelting technologies of bearing steel such as vacuum smelting, electroslag remelting and electron beam remelting have been developed. The structure of the bearing steel in use should be the tempered martensite matrix with fine carbide particles evenly distributed.

Through unremitting efforts, the minimum oxygen content in bearing steel has been reduced from 28 ppm in the 1960s to 5 ppm in the 1990s. Improving the cleanliness of bearing steel, especially reducing the oxygen content in the steel, can significantly extend the life of the bearing. In order to extend the life of bearing steel, people have been working on developing and applying refining technology for many years to reduce the oxygen content in steel. Strength, necessary toughness, certain hardenability, corrosion resistance in atmospheric lubricants.45%, and the carburizing time is shortened from 7 hours to 30 minutes. In the future, bearing steel will mainly develop in two directions: high cleanliness and diversified performance

The manufacturing market is reorganized; and the marketing and maintenance technology of the network platform provides a fast and comprehensive after-sales service system. The clean production of construction machinery must be thoroughly studied and promoted, and clean construction machinery products must be developed and launched. However, as the market economy and reform and opening up continue to deepen and advance, especially after joining the WTO,

China’s construction machinery industry will face increasingly fierce competition, because in accordance with my country’s commitment to foreign negotiations, my country’s construction machinery industry will Cancel import control. When faced with high-profit, high-risk new construction machinery and low-profit, low-risk traditional machinery to choose, it is often easier to accept the latter. A highly qualified scientific research team with dedication and team spirit is unimaginable. Scientific research on construction machinery should not only be satisfied with solving the practical problems of the enterprise, but also focus on original innovation., are all concentrated expressions of information technology.

3 Outdated concepts, lack of demand and pull for scientific research 　　Practice has proved that the scientific research process and its results depend to a certain extent on the stimulation and pull of market demand. To conduct research on construction machinery topics and solve related technical problems requires interdisciplinary and multi-field cooperation. So much so that in my country's large construction sites such as the Gezhouba on the Yangtze River and Xiaolangdi on the Yellow River, almost all foreign construction machinery such as Caterpillar's bulldozers and Komatsu excavators are hard to find. Of course, it is also one of the important tasks of construction machinery scientific research.

Practice has shown Mechanical Bearing 6000 relying on information technology can efficiently conduct scientific research and promote the results, and finally make enterprise production and management more scientific and reasonable, resources and energy are fully utilized, the technological content of products can be improved, and the cost can be greatly reduced. According to statistics, 32% of the existing machinery and equipment in my country's equipment industry have more than 30 years of service. So that construction machinery products with Chinese characteristics can be on the world stage as soon as possible. Analyzing the above-mentioned status quo of the construction machinery industry is not optimistic. 

Due to the large partial strike 68 Series Ball Bearings of multi-cavity forging, and the severe cold strike during the final forging, the guide rail is damaged severely in the early stage, and even the phenomenon of 'hammer stuck' occurs.; ⑷. Improve the design of the secondary valve and increase the area of ​​the orifice, thereby increasing the flow rate and velocity during the slow drop process.　　When lifting the hammer, you only need to manipulate the main valve to make the high pressure oil in the oil pump accumulator communicate with the lower cavity of the main cylinder piston.　　

But for multi-cavity forging die forging hammer to implement 'head change' transformation, 'flexible thin hammer rod theory' is obviously not applicable. According to the principle of tribology, 3 sets of tensioning structures (compression piece, taper sleeve, hammer rod) are designed to make the hammer rod by The original 'double cone structure' is changed to a 'single cone structure', which greatly avoids the occurrence of stress concentration, thereby achieving both reliable connection and convenient disassembly. The hydraulic station part includes: oil tank, motor-oil pump unit,

Electronically controlled unloading valves, valve seats, electronically controlled thermometers, heat exchange motor pump units, heat exchangers, oil filters, etc. The electro-hydraulic power head, its main body is a tank, which is used as a short-term oil tank during operation (when not working, the oil in the tank enters the oil tank of the hydraulic station placed on the ground through the oil retu pipe), with eight bolts passing through

The cushion and the pre-compression spring are fixed at the original cylinder position. In the past, “free forging electro-hydraulic hammers are not free”.2mm), which makes the forging process The eccentric force is boe by the hammer head rail, which greatly improves the life of the hammer shaft. According to the different sealing oil and gas sealing media, choose Ky rings with different Shore hardness.　　

 Keep close contact with Mechanical Bearing 6900 practice and strive to cultivate the ability to solve practical engineering problems; force and failure analysis should be carried out according to the working conditions of parts and components, and design calculation formulas should be established according to functional requirements and design constraints. 2)

The complexity of design management in the design process. In the design process, the designer continuously enriches and perfects the design information of the product until the entire product design is completed. In order to adapt well to this job, mechanical designers must possess the following basic qualities: 1. 5., the general content and goals of each stage are shown in Figure 1-2. The production level of the machinery industry is one of the main indicators of the level of modeization of a country.gif[/img] Table 1-1 'Machine Examples §1-3' Concepts and Features of Mechanical Design 1.

High sense of responsibility and rigorous work style: The designer should be responsible for the technical rationality of the design and the design consequences, and should work meticulously. The functional structure diagrams of different machines are different, and even the total functional requirements are the same, the functional structure diagrams of different schemes can be designed.

Starting from market demand, through conception, planning, and decision-making, the functions, principle schemes, technical parameters and structure of mechanical products are determined, and the ideas are tued into reality. Sustainable development issues in mechanical design 1) The products designed should meet the goals of the national science and technology policy and the national science and technology development plan: to design competitive advanced products, you should also have a good understanding of the country's science and technology in different periods Policies and scientific and technological development plans; 2)

The designed products should meet the requirements of reducing environmental pollution caused by the three wastes; 3) The designed products should meet the safety and reliability requirements of the human-machine system; 4) The designed products should be conducive to improving productivity ; 5) Reasonable use of resources. A machine can have only one execution part, or it can decompose the functions of the machine into several execution parts

The friction pair and the working environment (humidity) should be considered. Under normal circumstances, if the transfer speed of grease is increased by 2000r/min, its life will be reduced by about half.1. When adding grease, squeeze out the waste grease until you see new grease at the grease outlet. (3) The selected grease should be compatible with the load. At high speeds, a grease with a large penetration degree made of low-viscosity base oil should be selected; for low-speed grease, you should choose Grease with high penetration grade made of high viscosity base oil.

3 grease should be used. It is an important factor affecting the service life of grease. Main performance indicators of grease ①Drop point: refers to the temperature at which a certain fluidity is reached when heated under specified conditions. In the environment of strong chemical medium, synthetic oil grease resistant to chemical medium such as fluorocarbon grease should be selected. (7) Do not use wooden or paper containers to package grease to prevent oil loss and hardening, mixing with moisture, or being contaminated and deteriorated, and should be stored in a cool and dry place.

Remove waste grease and clean the parts. In this way, the variety of grease is reduced, the management of grease is simplified, and the cost of grease can be reduced due to the long service life of pleiotropic grease, and maintenance costs can be reduced. When the use temperature is high, the grease with good oxidation resistance, low evaporation loss and high dropping point should be selected; when the use temperature is low, it should be selected Grease with low starting torque and similar viscosity, such as grease based on synthetic oil. , Cone penetration is reduced and hardened,

after a certain 69 Series Ball Bearings, the grease will completely fail; under the action of mechanical shear, the structure of the grease will be destroyed (such as soap fiber detachment or orientation), causing its softening, decrease in consistency and precipitation The increase in oil volume will eventually lead to failure. In addition, moisture, dust, and harmful gases in the environment where the grease is used are also important factors that degrade it. (4) The selected lubricating grease should be compatible with the environmental conditions used

Y-bearing with eccentric locking 68 Series Ball Bearings is mainly suitable for applications where the rotation direction is inconvenient to fix. On one side of the inner ring of the bearing, there is an eccentric extension that fits with the locking ring. Rotate the locking ring on the extension of the inner ring in the direction of rotation to lock the ring and the bearing to the shaft. Use a flat head (fixing) screw to further fasten the collar to the shaft. SKF can provide two standard series: one is Y-bearing of YET2 series, the inner ring is extended on one side, and strong Superagriseal seals are fitted on both sides.

The eccentric locking ring is coated with a galvanized layer. The standard outer ring has two lubrication holes. The inner ring of YEL2 series Y-bearing extends on both sides. This helps reduce the degree of tilt of the inner ring to the shaft and makes the bearing run more smoothly. These bearings are equipped with sturdy standard Superagriseal seals and one of the following two types of oil retaining rings: oil retaining rings made of ordinary steel, with the designation suffix 2F. Steel plate oil baffle ring with rubber sealing lip (multiple seal), the model suffix is ​​2RF.

The outer ring has two lubrication holes as the standard form. SKF can also provide bearings without refueling holes according to customer requirements. These bearings are indicated by the suffix W. This type of SKF bearings include bearings for metric shafts, with a diameter range of 15-60mm and bearings for inch shafts, with a diameter range of 1/2-215/16 inches.

When cutting high manganese steel, the leading deflection angle should be smaller, which can increase the heat dissipation area of ​​the tool and the strength of the tip, and the secondary deflection angle should not be too large. When choosing cemented carbide tools, generally take κr=25°～45°, κ′r=10°～20°. When the rigidity of the process system is good, take a small value; otherwise, increase the main and secondary deflection angles appropriately. When ceramic tools are used, the entering angle can be larger, generally κr=45°～60°, and κr=60°～90° for fine tuing. (3)