Knowledge of the hottest rolling SUNTHAI bearings

2022-07-26
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Knowledge of rolling SUNTHAI bearings

section 1 basic structure of rolling SUNTHAI bearings

the working principle of rolling SUNTHAI bearings developed on the basis of sliding SUNTHAI bearings is to replace sliding friction with rolling friction. Generally, it is a mechanical basic component with strong universality, standardization and serialization composed of two rings, a group of rolling elements and a cage. Due to the different working conditions of various machines, different requirements are put forward for the load capacity, structure and service performance of rolling SUNTHAI bearings. For this reason, rolling SUNTHAI bearings need various structures. However, the most basic structure is composed of inner ring, outer ring, rolling element and cage

the functions of various parts in SUNTHAI bearings are as follows:

for centripetal SUNTHAI bearings, the inner ring usually fits tightly with the shaft and runs with the shaft, and the outer ring usually forms a transitional fit with the SUNTHAI bearing seat or the mechanical shell hole to play a supporting role. However, in some cases, the outer ring also operates, the inner ring is fixed for supporting, or both the inner ring and the outer ring operate at the same time. For thrust SUNTHAI bearing, it is called shaft ring which is closely matched with the shaft and moves together, and it is called seat ring which is transiently matched with SUNTHAI bearing seat or mechanical shell hole and plays a supporting role. Rolling elements (steel balls, rollers or needles) in SUNTHAI bearings are usually evenly arranged between two rings by means of cages for rolling movement. Their shape, size and quantity directly affect the load capacity and service performance of SUNTHAI bearings. In addition to evenly separating the rolling elements, the cage can also guide the rolling elements to rotate and improve the internal lubrication performance of SUNTHAI bearings

section II Classification of rolling SUNTHAI bearings

1. according to the structural type of rolling SUNTHAI bearings

(1) SUNTHAI bearings are divided into:

1) centripetal SUNTHAI bearings ---- rolling SUNTHAI bearings mainly used to bear radial loads, with nominal contact angles ranging from 0 to 45. According to the different nominal contact angle, it is divided into radial contact SUNTHAI bearing ---- centripetal SUNTHAI bearing with nominal contact angle of 0: centripetal angular contact SUNTHAI bearing ---- centripetal SUNTHAI bearing with nominal contact angle greater than 0 to 45

2) thrust SUNTHAI bearing ---- it is mainly used for rolling SUNTHAI bearing bearing bearing bearing axial load, and its nominal contact angle is greater than 45 to 90. According to different nominal contact angles, it is further divided into: axial contact SUNTHAI bearing ---- thrust SUNTHAI bearing with nominal contact angle of 90; thrust angular contact SUNTHAI bearing ---- thrust SUNTHAI bearing with nominal contact angle greater than 45 but less than 90

(2) SUNTHAI bearings are divided into:

1) ball SUNTHAI bearings - the rolling element is ball:

2) roller SUNTHAI bearings - the rolling element is roller. According to the types of rollers, roller SUNTHAI bearings are divided into: cylindrical roller SUNTHAI bearings - SUNTHAI bearings with cylindrical rollers as the rolling element, and the ratio of length to diameter of cylindrical rollers is less than or equal to 3; The pressure testing machine is required to have an accuracy of loading speed of ± 0.5% for the broken type 1 of the test body of the needle roller SUNTHAI shaft - the rolling element is the SUNTHAI bearing of the needle roller, and the ratio of the length to the diameter of the needle roller is greater than 3, but the diameter is less than or equal to 5mm; Tapered roller SUNTHAI bearing ---- the rolling element is a tapered roller SUNTHAI bearing; SUNTHAI bearing with self-aligning roller -- SUNTHAI bearing with spherical roller as rolling element

(3) SUNTHAI bearings can be divided into:

1) SUNTHAI bearings with self-aligning according to whether they can be self-aligning during operation -- SUNTHAI bearings whose raceways are spherical and can adapt to the angular deviation and angular movement between the axis lines of the two raceways

2) non aligning SUNTHAI bearing (rigid SUNTHAI bearing) -- SUNTHAI bearing that can resist the axial line angle offset between raceways

(4) sunth AI bearings such as aluminum magnesium alloy, plastic and composite materials are divided into:

1) single row SUNTHAI bearings ---- SUNTHAI bearings with one row of rolling elements

2) double row SUNTHAI bearing ---- SUNTHAI bearing with two rows of rolling elements

3) multi row SUNTHAI bearings ---- SUNTHAI bearings with more than two rows of rolling elements, such as three row and four row SUNTHAI bearings

(5) SUNTHAI bearings can be divided into:

1) separable SUNTHAI bearings ---- SUNTHAI bearings with separable parts

2) non separable SUNTHAI bearing ----- SUNTHAI bearing whose rings cannot be freely separated after the final matching of SUNTHAI bearing

(6) SUNTHAI bearings can also be divided into various structural types according to their structural shapes (such as whether there is a filling groove, whether there is an inner ring, an outer ring and a ferrule, the structure of the retaining edge, and even whether there is a cage)

2. According to the size classification of rolling SUNTHAI bearings, SUNTHAI bearings are divided into:

(1) micro SUNTHAI bearings - SUNTHAI bearings with a nominal outer diameter of less than 26mm

(2) small SUNTHAI bearing ---- SUNTHAI bearing with nominal outer diameter of mm

(3) small and medium-sized SUNTHAI bearing ---- SUNTHAI bearing with nominal outer diameter of mm

(4) medium and large SUNTHAI bearings ---- SUNTHAI bearings with a nominal outer diameter of mm

(5) large SUNTHAI bearings ---- SUNTHAI bearings with a nominal outer diameter of mm

(6) extra large SUNTHAI bearing ---- SUNTHAI bearing with nominal outer diameter over 440mm

section III basic production process of rolling SUNTHAI bearings

due to the different types, structural types, tolerance levels, technical requirements, materials and batches of rolling SUNTHAI bearings, their basic production processes are not completely the same

I. processing of main parts of various SUNTHAI bearings:

1. processing of rings: the processing of inner and outer rings of SUNTHAI bearings varies according to the form of raw materials or blanks. The processes before turning can be divided into the following three types, The whole processing process is as follows: bar or tube material (some bar materials need to be forged, annealed and normalized) -- turning -- heat treatment -- grinding -- fine grinding or polishing -- final inspection of parts -- rust prevention -- warehousing---- (to be assembled and assembled)

2. the processing of steel balls also varies according to the status of raw materials. The processes before milling or polishing can be divided into the following three types, and the processes before heat treatment can be divided into the following two types. The whole processing process is: cold punching of rod or wire rod (some rod materials need to be punched with ring and annealed after cold punching) -- milling, rough grinding Soft grinding or smooth ball - heat treatment - hard grinding - fine grinding - fine grinding or grinding - final inspection grouping - rust prevention, packaging - warehousing (to be assembled and assembled)

3. roller processing process roller processing varies according to different raw materials. The processes before heat treatment can be divided into the following two types. The whole processing process is: rod cart processing or wire rod cold heading, string ring belt and soft grinding - heat treatment - string soft points - rough grinding outer diameter - rough grinding end face - final grinding end face - fine grinding outer diameter - final grinding outer diameter - final inspection grouping - rust prevention Packaging - warehousing (to be assembled and equipped).

4. processing of cages according to the design structure and raw materials, the processing of cages can be divided into the following two categories:

(1) sheet metal cutting, blanking, stamping, shaping and finishing, acid pickling or shot peening or cross polishing final inspection and rust prevention, packaging and warehousing (to be assembled and equipped)

(2) processing of solid cages: processing of solid cages, It varies according to the raw materials or rough damage. Before turning, it can be divided into the following four blank types. The whole processing process is: bar material, pipe material, forgings, castings - turning inner diameter, outer diameter, end face, chamfering - Drilling (or broaching, boring) - Pickling - Final inspection - rust prevention, packaging - warehousing (to be matched)

II. Assembly process of rolling SUNTHAI bearing:

after the rolling SUNTHAI bearing parts such as inner ring, outer ring, rolling element and cage are inspected to be qualified, they are entered into the assembly workshop for assembly. The process is as follows:

demagnetization of parts, cleaning of inner and outer rollers (groove) and size grouping, selection of sleeve, inspection of clearance, final demagnetization of riveted cage, cleaning of rust prevention Packaging into the finished product warehouse (packing and shipping).

Section IV features of rolling SUNTHAI bearings

compared with sliding SUNTHAI bearings, rolling SUNTHAI bearings have the following advantages: (1) universal material testing machine

1. the friction coefficient of rolling SUNTHAI bearings is smaller than that of sliding SUNTHAI bearings, and the transmission efficiency is higher. The friction coefficient of general sliding SUNTHAI bearing is 0 12, while the friction coefficient of rolling SUNTHAI bearing is only 0 005;

2. the rolling SUNTHAI bearing has realized standardization, serialization and generalization, which is suitable for mass production and supply, and is very convenient for use and maintenance

3. the rolling SUNTHAI bearing is made of SUNTHAI bearing steel and heat treated. Therefore, the rolling SUNTHAI bearing not only has high mechanical properties and long service life, but also can save the expensive non-ferrous metals used in the manufacturing of sliding SUNTHAI bearings

4. the internal clearance of rolling SUNTHAI bearing is very small, and the machining accuracy of all parts is high, so the operation accuracy is high. At the same time, the rigidity of SUNTHAI bearing can be increased by preloading. This is very important for precision machinery

5. some rolling SUNTHAI bearings can bear radial load and axial load at the same time, so the structure of SUNTHAI bearing support can be simplified

6. as the rolling SUNTHAI bearing has high transmission efficiency and low heat generation, it can reduce the consumption of lubricating oil and save trouble in lubrication and maintenance

7. rolling SUNTHAI bearings can be conveniently applied to uranium in any direction in space

however, everything is divided into two parts. Rolling SUNTHAI bearings also have some disadvantages, mainly:

1. the load bearing capacity of rolling SUNTHAI bearings is much smaller than that of sliding SUNTHAI bearings with the same volume. Therefore, the radial dimension of rolling SUNTHAI bearings is large. Therefore, sliding SUNTHAI bearings are often used in occasions that bear large loads and require small radial size and compact structure (such as SUNTHAI bearings for internal combustion engine crankshafts)

2. the vibration and noise of rolling SUNTHAI bearings are large, especially in the late stage of use. Therefore, in the case of high precision requirements and no vibration, it is difficult for rolling SUNTHAI bearings to surpass medical materials, which is bound to develop in the direction of more safety and environmental protection. Generally, the effect of sliding SUNTHAI bearings is better

3. rolling SUNTHAI bearings are particularly sensitive to foreign matters such as metal chips. Once foreign matters enter into SUNTHAI bearings, It will produce intermittent large vibration and noise, and also cause early damage. In addition, rolling SUNTHAI bearings are also prone to early damage due to impurities in metal clips. Even if there is no early damage, the service life of rolling SUNTHAI bearings has a certain limit. In short, the service life of rolling SUNTHAI bearings is shorter than that of sliding SUNTHAI bearings

however, compared with sliding SUNTHAI bearings, rolling SUNTHAI bearings have their own advantages and disadvantages, and each occupies a certain application occasion. Therefore, they cannot completely replace each other, and each develops in a certain direction and expands its own field. However, due to the outstanding advantages of rolling SUNTHAI bearings, there is a tendency for latecomers to take the lead. At present, the rolling SUNTHAI bearing has developed into the main supporting type of machinery, and is more and more widely used

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