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Ball; 4. The junction of the distributor and the entrance of the cast iron disc does not match, Or the distributor retreats so that the steel ball stays at the entrance for a short time, and is injured by the 626 ball bearing groove edge of the grinding wheel; 7. When the grinding wheel drops particles (blocks) on the surface of the ball, the local pressure increases sharply; 3. The cast iron disc has sand holes, pores and hard particles, which make the local pressure on the surface of the steel ball excessive; 6.Causes of spot burns: 1. The coolant is too dirty, and the grinding wheel is not cleaned up in time when repairing the grinding wheel.. The machine tool spindle bearing is damaged, causing the grinding wheel to swing too much; 5.

Goal channeling at the entrance of the cast iron plate; 8. The grinding wheel groove cracks or the defect of the broken block hits the steel. The speed of the grinding wheel is too fast, and the steel ball suddenly accelerates; 2. The pressure of the steel ball is too high; 9. The goal speed is too slow, and the number of steel balls between the grinding wheel and the plate is too small

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This tells us that if the stainless steel is weakly magnetic or not magnetic at all, it should be judged as 304 or 316 material; if it is the same as carbon steel, it shows strong magnetism, because it is judged as not 304 material. The greater the degree of cold working deformation, the greater the transformation of martensite and the greater the magnetic properties of the steel. It does not attract and has no magnetism. Because the bending deformation is larger, the magnetic induction is more obvious. Body tissue.

There are many types of stainless steel, which can be divided into several categories according to the organizational structure at room temperature: 1. In this way, 304 stainless steel will have weak magnetic properties.. In addition, after 304 stainless steel is cold worked, the structure will also be transformed into martensite. If the magnet is magnetic, it is considered to be a counterfeit. In fact, this is an extremely one-sided and impractical method of identifying errors.


That is to say, the magnetism of 304 steel always shows weak magnetism.5 tubes are produced. However, due to chemical composition fluctuations or different processing conditions caused by smelting, magnetism may also appear, but this cannot be considered as What is the reason for counterfeit or unqualified? As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Martensite or ferrite type: such as 430, 420, 410, etc. We suggest 6202 ball bearing that when buying stainless steel products, you should choose products from reputable manufacturers

6, short-circuit 　　 If a component in the engineering machinery starting system or control circuit is damaged and cannot be repaired or replaced with spare parts, if the usage permits, consider short-circuiting it for emergency use. 2. The water pump will return to normal after replacing the new water seal. If there is a perforation, it can be treated with a wooden cork, and then tied up with iron wire or rope if necessary

Therefore, relying on and fan motor bearing informatization is the only way to drive the industrialization of construction machinery, improve the quality of my country's construction machinery products, and catch up with the world's advanced construction machinery. And shorten the product development cycle, adjust the quantity and variety of products in time to quickly respond to market needs. Because all kinds of modern design methods and advanced manufacturing technologies, such as concurrent design, virtual technology,

flexible systems, intelligent processing and lean production, etc. In terms of the service life of key components, domestic engines are around 3000h, while foreign ones exceed 8000h; domestic hydraulic pumps are around 2500h, while foreign ones are 5000-8000h.　　 It is very obvious that the scientific research of construction machinery and the achievement of expected results are also inseparable from the support of information technology. The average service life of domestic machines is about 6000-7000h, while foreign machines are more than 20000h; the failure-free period of domestic machines is about 300h (some or even less), while foreign machines It reaches 500-1000h.

2. In other words, scientific research should be forward-looking. Therefore, improving the technical equipment and technological level of the construction machinery manufacturing industry is undoubtedly an extremely important guarantee for the promotion of scientific research results and the application of new products. This old and conservative concept objectively makes the scientific research of construction machinery and the popularization and use of new technologies lack the pull and stimulation of demand.

This undoubtedly increases the difficulty of construction machinery from material selection to design, processing and use, and it is also a challenging new topic for scientific research personnel of construction machinery. Design information technology can inject infinite power into product design innovation in manufacturing; business and production information technology can optimize resource allocation and management; process information technology supports advanced manufacturing technology; e-commerce and supply chain technology can promote

The electrical 62 Series Ball Bearings part includes: main motor, cooling motor, electric control box, button station, etc. b. The high pressure nitrogen drives the piston to drive the hammer head to strike, referred to as 'air pressure drive, hydraulic energy storage'. The oil chamber at the lower part of the accumulator is directly connected to the main control valve, and the upper part is connected to the gas cylinder group through the pipeline.

Special valves and safety valves include: main control valve, quick discharge valve, insurance Valves, Hall switches, etc. Among them, the liquid-gas electro-hydraulic hammer has become more mature through continuous innovation. At the same time, the upper part of the piston makes the hammer head under the action of gas pressure and the weight of the hammer head system. The body part includes: left and right body, left and right guide rails, base (free forging), etc. ⑷. Designed 'X'-shaped rail structure:

The comb-shaped rail of domestic steam-empty forging hammers exists The disadvantages of short force arm, over positioning, and no temperature compensation function. The piston separates the oil at the lower part from the nitrogen at the upper part. The upper cavity of the hydraulic hammer cylinder is high-pressure nitrogen, and the lower cavity is high-pressure oil, so early electro-hydraulic hammers are prone to occur b. With the rapid development of modern hydraulic technology and electronic control technology, electro-hydraulic hammers have gradually developed, especially in the 1980s. Gas cylinders: nitrogen cylinders, gas Bottle holders, gas collectors, high-pressure ball valves, etc.

Therefore, when we carry out the 'head changing' transformation, for the multi-cavity forging and large eccentric load die forging hammer, we still use the 'rigid thick hammer rod theory' of the steam-air forging hammer, and achieve satisfactory results. The surface of the hammer shaft has been rolled to improve the surface hardening layer, thereby increasing the service life of the hammer shaft. The hammer rod piston quickly completes the return stroke of the hammer head under the action of high pressure oil.; ⑺. Technological innovation　

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And contains sulfur, phosphorus and nitrogen at the same time. As well as various types of hydraulic oils (liquids) for different purposes that should be 'used' with various types of compound additives such as antioxidants and rust prevention. Reasonable selection of seals and sealing materials, correct installation, use and maintenance of seals according to the system operating conditions and medium environment are the keys to obtaining effective sealing effects, reliability and service life.

At present, most of the sealing materials used at home and abroad are polymer elastomers, and plastics and various metals are also used under some special conditions. The formation of the sealing effect: dynamic sealing is divided into non-contact sealing and contact sealing. Or adopt the form of two or more materials composite or combined structure to exert their respective strengths to achieve a more comprehensive effect. Therefore, anti-wear agents are used in the hydraulic oil; in order to adapt to the hydraulic system near high-temperature heat sources and open flames, anti-wear agents are used.

The relative Non-standard Series Deep Groove Ball Bearings surfaces of the oil seal and the shaft move under the lubrication state where the oil film is separated, so the friction resistance and wear are small. No1 standard oil is 'low volume increase oil'. Compatibility of the sealing material and hydraulic oil (liquid): One of the sources of particle contamination of hydraulic oil is the 'debris' or 'wear debris' caused by the incompatible seal material and hydraulic oil. In the hydraulic system, the influence of hydraulic oil (liquid) on the sealing performance of the seal, except for the compatibility of the medium/seal material, the viscosity of the oil, the change of viscosity with temperature, the speed of reciprocating (rotating) movement, the pressure and the shaft and cylinder