In the grinding process, the grinding head realizes the reciprocating swing feed, and it follows the eccentric rotating connecting rod neck for grinding processing. In order to achieve follow-up grinding, the X-axis must not only have high dynamic performance, but also have sufficient tracking accuracy to ensure the required shape tolerance of the connecting rod neck. Generally, grinding speeds of up to 120-140m/s can be used on crankshaft grinders, and the grinding efficiency is very high.

The delivery time is greatly shortened; 　　3. One of the main characteristics of the old-fashioned production line is that there are too many ordinary equipment. In the past, the machining center was called a compound processing machine tool, but due to the limitation of the variety of tool exchange processing, and the cutting processing field was not available, the general processing center is no longer called a compound processing machine tool. For finishing, ordinary crankshaft grinders such as MQ8260 are generally used for rough grinding, semi-finish grinding, fine grinding and polishing, which usually rely on manual operation, resulting in unstable processing quality and poor dimensional consistency.

According to experts, the crankshaft turning-turning machine tool is particularly suitable for crankshafts with undercut grooves on the journal and no machining on the side of the balance weight; while high-speed external milling cannot process crankshafts with undercut grooves in the axial direction.

In recent years, Non-standard Series Deep Groove Ball Bearings grinders are required to have stable machining accuracy. In order to protect the environment, it is required to use less or no cutting fluid, that is, to achieve dry cutting or quasi-dry cutting; 　　 is based on the above situation, enter 21 Over the past century, high-speed, high-precision, and high-efficiency composite processing technology and equipment have been rapidly applied in the automotive crankshaft manufacturing industry, and the production efficiency has been greatly improved., one of which was a crankshaft turning-turning machine with several holes, and the other was a CNC high-speed external milling of a crankshaft

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It is particularly pointed out Bearing PCN26 that the preload amount cannot be too large. (4) The rigidity of the bearing The rigidity of the bearing refers to the force required to produce unit deformation of the bearing. When INA bearings bear combined radial and axial loads, angular contact ball bearings or tapered roller bearings are generally used. (1) The space and position of the machinery occupied by the bearing. In the chapter after the comprehensive technical introduction, the designer of the bearing configuration will see the necessary basic information provided in the order of general requirements.

The information included in the comprehensive technical chapter is generally applicable to ordinary rolling bearings, or at least to a set of bearings. In addition, various types of bearings can also be pre-tightened to achieve the purpose of increasing supporting rigidity. Obviously, it is impossible to include all the information required for every conceivable bearing application.. Generally, cylindrical and tapered roller bearings should be used.

However, when the INA bearing is restricted in the diameter direction of the machine, needle roller bearings, extra-light and ultra-light series ball or roller bearings are selected; when the axial position of the bearing in the machine is restricted, narrow or Ball or roller bearings in the special narrow series. For this reason, we will mention comprehensive INA application engineering services in many places.

The elastic deformation of rolling bearings is very small, and it is not necessary to consider in most machines, but in some machines, such as machine tool spindles, bearing rigidity is an important factor. In terms of the direction of the load, deep groove ball bearings, cylindrical roller bearings or needle bearings can be selected when bearing pure radial loads. When the center line of the shaft is different from the center line of the bearing seat, there is an angular error, or the shaft has a relatively large distance between the two supports and the rigidity of the shaft is small, so it is easy to bend or tilt.

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It has high requirements for the neutrality of the two shafts and has no buffer and vibration absorption functions. Flange coupling (GY, GYD type) Among the fixed couplings, flange coupling is the most widely used one. It is composed of two flanged half couplings. Sleeve couplings are often used where the load is stable, the diameter of the two shafts is small, and the accuracy of the two shafts is high.1. 2. The sleeve coupling has a simple structure and a small radial dimension. As shown in Figure 2-5, the two halves of the coupling are connected by ordinary bolts. Reamed hole bolts can also be used for centering. The torque is transmitted by the friction of the contact surface of the two discs of the coupling, and it is centered by the shoulder and groove. There is a gap between the bolt and the bolt hole.

As shown in Figure 2-6, the bolts are subjected to shearing and extrusion to transmit torque, so the torque is relatively large, but the reaming is required and the processing is more complicated. It is widely used in the connection of stable load, good two-axis alignment, short and good rigidity.. The two half couplings are respectively connected to the two shafts with keys, and the two half 69 Series Ball Bearings couplings are connected into one body with bolts. The flange coupling has a simple structure and is easy to maintain. When assembling and disassembling, a shaft needs to be moved axially, and has no buffering and vibration absorption functions. Sleeve coupling (GT type) Sleeve coupling is connected with a key or pin through a common sleeve, as shown in Figure 2-7. It can transmit large torque but cannot compensate the relative displacement of the two shafts

). The first type of grinder is divided into the following groups according to different processing: 0—instrument grinder; 1—cylindrical grinder (such as M1432A, MBS1332A, MM1420, M1020, MG10200, etc. and added to the end of the model. The model also indicates the main specifications of the machine tool..); 9—tool grinder (such as MK9017, MG9019, etc.. The general characteristic code of the grinder is in the second place of the model (see Table 1-1). Superfinishing machine tools, polishing machine tools, and abrasive belt polishing machines are the second category, denoted by 2M...

The maximum grinding diameter is 200mm, and the design is improved for the first time. Generally, it is expressed by the largest diameter size processed on internal and external cylindrical grinders or 1/10 of the width (or diameter) of the surface grinder table; crankshaft grinder means 1/10 of the maximum turning diameter; centerless grinder means the basic parameters themselves (such as M1080 Indicates that the maximum grinding diameter is 80mm). It should be noted that the main parameter codes of cylindrical grinders are different from those of centerless cylindrical grinders.

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6～12.5 ～11.31Crl8Ni9Ti16.51O.820. The press-in assembly method is mostly used for light and medium-sized static cooperation, and requires mechanical equipment such as a press, so it is generally only used in manufacturing plants.6 14 brass 17. 1.9 Cast Iron 8.611.617.9-16 tin bronze 17. After cooling, the machine parts will reach the required Bond strength.2), not subject to axial movement and After being flattened and cooled, the bonding strength of the internal and external parts will be greater, and the torque that can be transmitted is also greater.9～13.512. In order to prevent the container from cooling and shrinking, the assembly time must be limited. The following describes the hot suit matching method. Generally, empirical data is recommended: heating the minimum assembly gap ⊿ (um) The weight of the machine (㎏) is heated Connector diameter (㎜)

80～120>120～～5060～70100～120150～17050～6080～90130～150180～200210～23060～7090～100180～200240～250 250～270280～300 100～12020～24060～28090～31030～360220～240300～320340～360380～ The diameter increase value of the hole of the 400 container after heating has the following relationship: i+⊿=(t+t0)103*a*D Where: t—the temperature after heating (℃); to—the temperature at which heating starts (℃) ;

I-Interference (um); ⊿-Assembly clearance (㎜) required for the shaft to freely pass into the hole (avoid surface 63 Series Ball Bearings friction); D-Diameter (mm) of the containing part (hole); a- The coefficient of linear expansion (10ˉ6·l/℃) of the container (hole) material. At this time, the above formula can be written as: t=K/(a*D)+ to Note: The unit of K value in the formula is the linear expansion coefficient a value of various metal materials (10ˉ6·l／℃) Material heating temperature Range (℃) Cooling ℃ 20～10020～20020～30020～40020～600 Engineering copper 16.211. The size of the assembly gap directly affects the assembly time.217.918.730CrMnSiAll3Crl310.

At the installation site, the hot-set matching method is mainly used, because this assembly method is relatively simple and can be used for large-diameter (D; 1000mm) and large interference) machine parts. In fact, the heating expansion value must be greater than the matching interference value in order to ensure smooth installation without serious accidents such as the shaft and the hole being stuck due to the cooling and shrinkage of the container during the installation process.640CrSi11.7～11.2-8 nickel-chromium alloy 14.913.818.

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For severe impact loads or transmissions that require the elimination of torsional vibration of the shafting, tire couplings can be used. There is a certain degree of displacement in the x and y directions and the skew angle CI. After installation and adjustment, it is difficult to maintain strict and accurate centering of the two shafts, or when the two shafts will produce a large additional relative displacement during work, a flexible coupling should be used.),

because of their good comprehensive capabilities, are widely used in general medium and small Power transmission. 4) Reliability and working environment of the coupling. 2) The working speed of the coupling and the magnitude of the centrifugal force caused. Strict alignment is often not guaranteed. General non-metallic elastic element couplings (such as elastic sleeve pin couplings, elastic pin couplings, plum-shaped elastic couplings, etc. The basic steps for selecting a coupling are as follows: select the type of coupling according to the size of the transmitted load, the speed of the shaft speed, the installation accuracy of the two parts to be connected, etc. Most couplings have been standardized or standardized.

The following cleaner motor bearing can be considered in the specific selection: 1) The size and nature of the torque to be transmitted and the requirements for the buffer vibration reduction function. The structure of various flexible couplings is different, and the difference is relatively Large, the role in the transmission system is not the same. For example, when the radial displacement is large, the slider coupling can be selected, and if the angular displacement is large or the two shafts intersect, a universal coupling can be used.,

referring to the characteristics of various types of couplings, choose a suitable one Coupling type. Couplings that contain non-metallic components such as rubber are sensitive to temperature, corrosive media, and strong light, and are prone to aging. Couplings are also called couplings, pairs of wheels, backrest wheels, etc. Couplings that are usually made of metal components and do not require lubrication are more reliable; couplings that require lubrication are susceptible to the performance of the lubrication and may pollute the environment.

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OP).. It has the advantages of low friction resistance, low noise, low penetration force, corrosion resistance, etc. l Asian metric: standard (SDM), adjusted (SDM...AJ), open (SDM....AJ), open type (SDB.... It is widely used in electronic machinery, printing machinery, material handling machinery and various precision measuring instruments...

The structure is guided by the cage to make the steel balls do a very smooth circulation. The bearing outer cylinder is equipped with a cage, steel balls, side plates, etc.AJ), open (SDE..Features and uses of linear bearings Linear ball bearings are high-precision bearings that make rolling contact with a shaft and use the shaft as a track to make infinite linear movements in the direction of the shaft.OP) 2 European metric: standard (SDE), adjusted (SDE. Linear ball bearings have Asian metric system, European metric system and English system series, and each series has three forms, namely standard type, adjusted type and open miniature deep groove ball bearings suppliers type.OP) 3 Inch series: standard type (SDB), adjustment type (SDB

When the engine is overhauled, the crankshaft whose abrasion has exceeded the specified crankshaft should be repaired according to the repair size. After the main shaft journal and connecting rod journal wear, the roundness or cylindricity deviation is greater than 0. During actual repairs, in order to ensure the strength and rigidity of the crankshaft, the maximum reduction is generally not more than 1. The repair size of the crankshaft journal is at a level of 0.025mm, the crankshaft should be polished.06mm, the bearing seat hole should be repaired. The grinding of the crankshaft journal is carried out on a dedicated crankshaft grinder.25mm reduction.40μm, the diameter difference of each journal shall not exceed 0. If it is exceeded, it can be repaired by thermal spraying or surfacing
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B bearing core structure, model series and size representation method: structural features: one end of the inner ring of the bearing has a flat head and one end protrudes, with a set screw. PP: stamping vertical seat. Bearings with seats-bearing core structure, model and size representation method: 1. PA: Cast narrow vertical seat.

There is a sealing air condition motor bearings Manufacturers in the circular hole in the center of the disc, which is used to install a felt seal ring to prevent the leakage of lubricating oil in the box and the debris outside the box from intruding into the box. The function is to install threaded fasteners to connect the bearing end cover and the box body, so it is also called the mounting hole. For standard structural elements, after measuring the dimensions, look up the table for standard values. Generally, the fitting length here is e1=( 0.10-0

The inner diameter of the inch system such as KH206-18 is: 18/16X25. Model series: Metric KH2xx; Inch: KH2xx-x or KH2xx-XX. UK bearing core structure, model series and size representation method: structural characteristics: both ends of the inner ring are flat heads, and the inner hole is tapered. Series are PP2xx, PP3xx, PPXxx. Model series: UG2xx+ER, UG3xx +ER. Dimension calculation: The metric size calculation method is the same as the general class.. F: Cast square seat. The series are FL2xx, FL3xx, FLXxx. The code name of the bearing seat P: Cast vertical seat. FC: Cast boss round seat. Bearing unit composed of bearing core and bearing housing. Series include F2xx, F3xx, FXxx. C: Cast ring seat.575mm. FL:

Cast diamond seat. 3. FS: Cast boss square seat. It has outstanding self-aligning and sealing performance. The inch size is hexadecimal. The series are FS2xx, FS3xx, FSXxx. 5.05mm. Structural features of bearing with housing: 1. FK: Cast hanging seat. CS bearing core structure, model series and size representation method: structural features: flat ends at both ends of the inner ring of the bearing, sealed with a rubber cover. Adapter sleeve selection: If UK210 bearing core is used with H2310 adapter sleeve.4=19
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Bearing seat wear has always been a problem that troubles enterprise equipment managers. I have seen many times that some netizens have consulted why the bearing seat wears? What to do if it is worn out? The editor today took the wear of the bearing housing of the gear box of the cold rolling mill reducer as an example to explain the reasons for the wear of the bearing housing and how to repair the wear.

Case of wear of bearing housing of gear box of reducer of cold rolling mill:

During the production and operation of an enterprise, the two output shafts of the main reduction gear box of an enterprise were found to have different levels of vibration through the online detection device. After the gear box was dismantled, it was found that the outer bearing seats of the two output shafts and the outer ring of the matching bearing appeared Wear marks, the depth of wear is about 0.3mm. The reducer has a three-layer structure of upper, middle and lower, the output shaft is distributed up and down, the input speed is 0-500 / 1200r / min, the reduction ratio is 2.92 / 1.513, and the bearing model is 24152.

Why are there problems with bearing housing wear?

Reducer gearboxes are widely used in industrial enterprises. In the steel industry or non-ferrous metal rolling production lines, large gearboxes are used, and they are an important mechanical component. The main gearboxes of cold rolling mills are mainly The function is to transfer the original power of the motor to the rolls of the rolling mill through gear speed change or speed regulation and make it get the corresponding speed. The gear box of the cold rolling main reducer has its particularity during the production and operation process. The two output shafts rotate in the opposite direction synchronously. During the production process, the impact and torque transmitted by the rollers are quite large. In this case, the bearing housing is subject to squeeze. If the pressure is large, eccentric wear is easy to form.

The gearbox of this enterprise’s reducer has been used for a long time, and from the bearing room worn on the site, the machining accuracy of the gearbox has problems at the factory. There are traces of plating on the surface of the bearing seat. Rings and bearing seats wear out and cause equipment vibration.

How to repair the bearing seat wear problem?

1. Dismantle and inspect the gear box components to confirm the wear status and wear amount of each bearing seat;

2. Surface treatment: first use the oxygen acetylene flame to roast the bearing seat, then use the polisher to polish the bearing seat to be repaired, and then use absolute ethanol to clean the polished bearing seat surface;

3. Blend the carbon nanopolymer material in proportion, then apply the blended material to the repaired part, and use the knife edge ruler to scrape and shape along the reference surface;

4. Heat curing;

5. Use the new bearing to grind the repaired bearing seat to show the points and remove the high points;

6. Apply the material to the inner surface of the bearing housing twice, and apply the carbon SD7000 release agent to the outer ring of the bearing;

7. Reinstall the gear shafts and other parts and gear boxes of each layer, and start the operation.

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