Installation method for large motor bearing housing:
(1), the foot screw:
1. The screw that fastens the bottom plate should be cleaned with a solvent such as gasoline, and check the thread for any clasp and damage. Try it with a nut. Also measure the actual length of the screw hole and check whether the length of the screw is appropriate. The anchor plate should be in close contact with the foundation, and the anchor screw should be perpendicular to the anchor plate.
2, the most common screw for the foot screw is double screw, which is convenient to install, and also has a screw with a T-shaped shape. The screw of this structure is put down from the top, and the screw is placed in the in-line hole of the anchor plate. Then, rotate the 900 screw to be locked by the anchor plate. Before the anchor screw is tightened, the thread should be pre-applied with lubricant.
(B), the bottom plate:
The bottom plate of a large motor is usually welded by steel plates or welded by I-beam and channel steel.
The bottom plate of the motor is integral and also has a block. Their role is to support the motor and transfer the dynamic and static load of the motor to the foundation, keeping the motor and part of the mounting dimensions and clearance constant.
1. Remove oil from the bottom plate before installation and remove the anti-rust paint. Especially in the joint surface with cement, it should be cleaned with paint and steel brush, then wiped with a cloth, it is best to pre-brush a layer of cement slurry.
2. In the cleaning of the bottom plate, pay attention to whether the bearing seat mounting surface and the stator base mounting surface are scratched or rusted. If similar defects are found, apply 锉 and sandpaper trimming.
3. The newly installed motor bottom plate must have strict requirements on the foundation. The foundation should be solid enough. Under certain static and dynamic loads, the foundation should not sink. In order to prevent the foundation of the motor from sinking, it is generally pre-pressed after the foundation is poured. The preloading weight is usually 1.5 to 2.5 times the weight of the motor. During the pre-pressing process, the elevation is continuously measured, and the sinking situation is observed, and the installation can be performed after the foundation stops sinking. For example, a steel mill pre-presses the foundation when installing the 1150 roughing mill motor. The preloading weight is about twice the total weight of the motor. After 48 hours, the foundation sinks to 2 mm.
2018年11月30日星期五
2018年11月28日星期三
Why is the bearing prematurely damaged? How to improve the life of bearings?
Bearings are an important part of contemporary machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. As everyone's demand for bearings increases, premature bearing damage, long life and other issues plague every mechanical enthusiast. Today, Xiaobian wants to share with you the methods and skills to extend the service life of the bearings. Welcome to share the comments and comments below.
Why is the bearing prematurely damaged? How to improve the life of bearings?
The number of revolutions or hours experienced by a bearing before pitting occurs under a certain load is called bearing life. Bearings within this life should be subject to initial fatigue damage on any of their bearing rings or rolling elements. However, in our daily practical use, it can be clearly observed that the bearing with the same appearance under the same working conditions has a very different actual life. What caused this? Xiaobian summed up the following points:
First, improper installation (about 16%)
1, the installation is too strong, which hit the bearing with a hammer on the bearing damage is the biggest; is also the main cause of deformation.
2. The installation is biased or not installed in the bearing position, resulting in too small bearing clearance. The inner and outer rings are not in the same center of rotation, causing disagreement.
Recommendation: Select an appropriate or professional bearing installation tool, and use a special instrument to detect it after installation.
Second, pollution (about 14%)
Contamination can also lead to premature bearing damage, which means that dust, metal chips, etc. enter the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.
Recommendation: It is best not to disassemble the bearing before use; keep the installation environment clean during installation, clean the bearing to be used; and strengthen the bearing seal.
Third, poor lubrication (about 50%)
According to the survey, poor lubrication is one of the main causes of premature bearing damage. Including not adding lubricant or lubricating oil in time; lubricant or lubricating oil is not filled in place; improper selection of lubricant or lubricating oil; incorrect lubrication method, etc.
Recommendation: Choose the right lubricant or lubricant and use the correct lubrication method.
Fourth, fatigue (about 34%)
Fatigue damage is a common way of damage to bearings. Common causes of fatigue damage may be: long-term overload operation of bearings; failure to repair in time; improper maintenance; equipment aging.
Recommendation: Select the appropriate bearing type and replace the fatigue bearing regularly.
Why is the bearing prematurely damaged? How to improve the life of bearings?
The number of revolutions or hours experienced by a bearing before pitting occurs under a certain load is called bearing life. Bearings within this life should be subject to initial fatigue damage on any of their bearing rings or rolling elements. However, in our daily practical use, it can be clearly observed that the bearing with the same appearance under the same working conditions has a very different actual life. What caused this? Xiaobian summed up the following points:
First, improper installation (about 16%)
1, the installation is too strong, which hit the bearing with a hammer on the bearing damage is the biggest; is also the main cause of deformation.
2. The installation is biased or not installed in the bearing position, resulting in too small bearing clearance. The inner and outer rings are not in the same center of rotation, causing disagreement.
Recommendation: Select an appropriate or professional bearing installation tool, and use a special instrument to detect it after installation.
Second, pollution (about 14%)
Contamination can also lead to premature bearing damage, which means that dust, metal chips, etc. enter the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.
Recommendation: It is best not to disassemble the bearing before use; keep the installation environment clean during installation, clean the bearing to be used; and strengthen the bearing seal.
Third, poor lubrication (about 50%)
According to the survey, poor lubrication is one of the main causes of premature bearing damage. Including not adding lubricant or lubricating oil in time; lubricant or lubricating oil is not filled in place; improper selection of lubricant or lubricating oil; incorrect lubrication method, etc.
Recommendation: Choose the right lubricant or lubricant and use the correct lubrication method.
Fourth, fatigue (about 34%)
Fatigue damage is a common way of damage to bearings. Common causes of fatigue damage may be: long-term overload operation of bearings; failure to repair in time; improper maintenance; equipment aging.
Recommendation: Select the appropriate bearing type and replace the fatigue bearing regularly.
2018年11月26日星期一
Rolling bearing material properties
According to national standards and bearing requirements, the materials currently used for bearing rings and rolling elements are high carbon chromium bearing steel, carburized bearing steel, etc. These materials are used in different occasions according to their different characteristics. It is not that bearings made with high-value carburized steel materials are necessarily more suitable than bearing steel bearings.
First, the high carbon chromium bearing steel is also called the hardenable steel inside and outside the same hardness, used in ordinary occasions, the largest amount, accounting for more than 80% of the total amount of materials.
1.GCr15
Features and uses: For general occasions, the largest amount, suitable for martensite and bainite quenching.
Technical characteristics: The effective wall thickness is below 26mm, the ultra-light and narrow series are below 16mm, and the quenching and tempering hardness is HRC57~62.
2.GCr15SiMn
Features and uses: For general use, for large bearings, only for martensite quenching.
Technical characteristics: The effective wall thickness is above 26mm, the ultra-light and narrow series are above 16mm, and the quenching and tempering hardness is HRC57~62.
GCr15 and GCr15SiMn are the most commonly used grades. It can be seen from the above description that the performance of these two steels is basically the same. Since the hardenability of GCr15SiMn steel is better than that of GCr15 steel, GCr15SiMn steel should be used for larger bearing parts. .
GCr15SiMn bearing steel is mainly used to manufacture bearings with large wall thickness, such as various large and extra large bearings, which are often used in heavy duty machine tools and rolling mills without working conditions with large impact loads. Due to the high crack sensitivity and poor impact toughness of GCr15SiMn steel, thick-walled bearings with impact loads cannot fully meet the requirements for use.
3.GCr18Mo
Features and uses: Bainite special steel, wear-resistant occasions, only suitable for bainite quenching.
Technical characteristics: The effective wall thickness is between 26~48mm, the special light and narrow series is below 16mm, and the quenching and tempering hardness is HRC57~62. Lower bainite wear resistance is better than martensite and therefore suitable for wear resistant applications.
Second, carburized bearing steel is also called semi-hardenable steel inside soft and hard, material properties have a certain "elastic" for impact-resistant occasions, need to be carburized and quenched, the process is more complicated.
G20Cr2Ni4A
Features and uses: for impact resistant applications, medium and large bearings, deep carburizing.
Technical characteristics: The effective carburizing layer can be more than 2.5mm deep, and the surface quenching and tempering hardness is HRC58~63.
Bearing parts made of this type of steel, after carburizing, quenching, tempering and other heat treatment processes, the surface has a high hardness (hardness ≥ HRC58) and a certain wear resistance and high resistance to contact fatigue, and ensure The heart has good toughness (hardness HRC33-48). This surface hardened core has toughness, making the carburized bearing steel particularly suitable for stable operation under high impact loads.
After carburizing and quenching, the surface retains the compressive stress state and the fatigue resistance is good. It has strong impact load resistance, and the surface hardened layer has micro cracks and is not easy to expand to the inside. The surface has a high hardness and a low core hardness, and has a better core impact toughness than a high carbon chromium bearing steel. The depth and concentration of carburization can be adjusted as needed.
However, the bearing of G20CrNi4A material has high cost, and in the use of small and medium-sized bearings, the service life is not greatly improved compared with bearing steel, so carburized steel is only used for medium and large-sized bearings.
First, the high carbon chromium bearing steel is also called the hardenable steel inside and outside the same hardness, used in ordinary occasions, the largest amount, accounting for more than 80% of the total amount of materials.
1.GCr15
Features and uses: For general occasions, the largest amount, suitable for martensite and bainite quenching.
Technical characteristics: The effective wall thickness is below 26mm, the ultra-light and narrow series are below 16mm, and the quenching and tempering hardness is HRC57~62.
2.GCr15SiMn
Features and uses: For general use, for large bearings, only for martensite quenching.
Technical characteristics: The effective wall thickness is above 26mm, the ultra-light and narrow series are above 16mm, and the quenching and tempering hardness is HRC57~62.
GCr15 and GCr15SiMn are the most commonly used grades. It can be seen from the above description that the performance of these two steels is basically the same. Since the hardenability of GCr15SiMn steel is better than that of GCr15 steel, GCr15SiMn steel should be used for larger bearing parts. .
GCr15SiMn bearing steel is mainly used to manufacture bearings with large wall thickness, such as various large and extra large bearings, which are often used in heavy duty machine tools and rolling mills without working conditions with large impact loads. Due to the high crack sensitivity and poor impact toughness of GCr15SiMn steel, thick-walled bearings with impact loads cannot fully meet the requirements for use.
3.GCr18Mo
Features and uses: Bainite special steel, wear-resistant occasions, only suitable for bainite quenching.
Technical characteristics: The effective wall thickness is between 26~48mm, the special light and narrow series is below 16mm, and the quenching and tempering hardness is HRC57~62. Lower bainite wear resistance is better than martensite and therefore suitable for wear resistant applications.
Second, carburized bearing steel is also called semi-hardenable steel inside soft and hard, material properties have a certain "elastic" for impact-resistant occasions, need to be carburized and quenched, the process is more complicated.
G20Cr2Ni4A
Features and uses: for impact resistant applications, medium and large bearings, deep carburizing.
Technical characteristics: The effective carburizing layer can be more than 2.5mm deep, and the surface quenching and tempering hardness is HRC58~63.
Bearing parts made of this type of steel, after carburizing, quenching, tempering and other heat treatment processes, the surface has a high hardness (hardness ≥ HRC58) and a certain wear resistance and high resistance to contact fatigue, and ensure The heart has good toughness (hardness HRC33-48). This surface hardened core has toughness, making the carburized bearing steel particularly suitable for stable operation under high impact loads.
After carburizing and quenching, the surface retains the compressive stress state and the fatigue resistance is good. It has strong impact load resistance, and the surface hardened layer has micro cracks and is not easy to expand to the inside. The surface has a high hardness and a low core hardness, and has a better core impact toughness than a high carbon chromium bearing steel. The depth and concentration of carburization can be adjusted as needed.
However, the bearing of G20CrNi4A material has high cost, and in the use of small and medium-sized bearings, the service life is not greatly improved compared with bearing steel, so carburized steel is only used for medium and large-sized bearings.
2018年11月2日星期五
TIMKEN 3600/2600/3100/43000/15500 Tapered Roller Bearing
TIMKEN 3600/2600/3100/43000/15500 Tapered Roller Bearing
Email:sales@bearingkingdom.com
1779 - 1738X
|
1700
|
23.813 mm0.9375 in
|
57.150 mm2.2500 in
|
19.837 mm0.7810 in
|
17.551 mm0.6910 in
|
20.221 mm0.7961 in
|
10200 lbf45400 N
|
10200 lbf45300 N
|
15574A - 15522A
|
15500
|
23.813 mm0.9375 in
|
59.530 mm2.3437 in
|
18.654 mm0.7344 in
|
15.083 mm0.5938 in
|
20.638 mm0.8125 in
|
10300 lbf46000 N
|
11300 lbf50100 N
|
15574A - 15523
|
15500
|
23.813 mm0.9375 in
|
60.325 mm2.3750 in
|
18.654 mm0.7344 in
|
15.875 mm0.6250 in
|
21.036 mm0.8282 in
|
10300 lbf46000 N
|
11300 lbf50100 N
|
15574A - 15523RB
|
15500
|
23.813 mm0.9375 in
|
60.325 mm2.3750 in
|
18.654 mm0.7344 in
|
15.875 mm0.6250 in
|
21.036 mm0.8282 in
|
10300 lbf46000 N
|
11300 lbf50100 N
|
1990X - 1931
|
1900
|
23.813 mm0.9375 in
|
60.325 mm2.3750 in
|
21.336 mm0.8400 in
|
15.875 mm0.6250 in
|
21.826 mm0.8593 in
|
10900 lbf48400 N
|
11300 lbf50200 N
|
3659 - 3620
|
3600
|
23.813 mm0.9375 in
|
61.913 mm2.4375 in
|
30.417 mm1.1975 in
|
23.813 mm0.9375 in
|
28.575 mm1.1250 in
|
19900 lbf88600 N
|
20200 lbf89800 N
|
2685 - 2620
|
2600
|
23.813 mm0.9375 in
|
63.101 mm2.4843 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.818 mm0.9377 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
2683 - 2620
|
2600
|
23.813 mm0.9375 in
|
63.101 mm2.4843 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.818 mm0.9377 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
2685 - 2630
|
2600
|
23.813 mm0.9375 in
|
63.101 mm2.4843 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.818 mm0.9377 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
2683 - 2630
|
2600
|
23.813 mm0.9375 in
|
63.101 mm2.4843 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.818 mm0.9377 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
23092 - 23250X
|
23000
|
23.813 mm0.9375 in
|
63.500 mm2.5000 in
|
21.463 mm0.8450 in
|
14.681 mm0.5780 in
|
21.692 mm0.8540 in
|
12300 lbf54600 N
|
12500 lbf55800 N
|
23092 - 23256
|
23000
|
23.813 mm0.9375 in
|
65.088 mm2.5625 in
|
21.463 mm0.8450 in
|
15.875 mm0.6250 in
|
22.225 mm0.8750 in
|
12300 lbf54600 N
|
12500 lbf55800 N
|
2683 - 2631
|
2600
|
23.813 mm0.9375 in
|
66.421 mm2.6150 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.818 mm0.9377 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
2685 - 2631
|
2600
|
23.813 mm0.9375 in
|
66.421 mm2.6150 in
|
25.433 mm1.0013 in
|
19.050 mm0.7500 in
|
23.813 mm0.9375 in
|
17200 lbf76600 N
|
18400 lbf81700 N
|
26093 - 26274
|
26000
|
23.813 mm0.9375 in
|
69.723 mm2.7450 in
|
18.923 mm0.7450 in
|
19.050 mm0.7500 in
|
19.050 mm0.7500 in
|
13200 lbf58800 N
|
13500 lbf60100 N
|
26093 - 26283
|
26000
|
23.813 mm0.9375 in
|
71.999 mm2.8346 in
|
18.923 mm0.7450 in
|
15.875 mm0.6250 in
|
18.999 mm0.7480 in
|
13200 lbf58800 N
|
13500 lbf60100 N
|
3162 - 3126
|
3100
|
23.813 mm0.9375 in
|
72.034 mm2.8360 in
|
39.573 mm1.5580 in
|
23.813 mm0.9375 in
|
39.741 mm1.5646 in
|
21300 lbf94800 N
|
22800 lbf102000 N
|
3162 - 3120
|
3100
|
23.813 mm0.9375 in
|
72.626 mm2.8593 in
|
39.573 mm1.5580 in
|
23.813 mm0.9375 in
|
39.741 mm1.5646 in
|
21300 lbf94800 N
|
22800 lbf102000 N
|
3162 - 3130
|
3100
|
23.813 mm0.9375 in
|
72.626 mm2.8593 in
|
39.573 mm1.5580 in
|
23.813 mm0.9375 in
|
39.741 mm1.5646 in
|
21300 lbf94800 N
|
22800 lbf102000 N
|
26093 - 26300
|
26000
|
23.813 mm0.9375 in
|
76.2 mm3 in
|
18.923 mm0.7450 in
|
15.875 mm0.6250 in
|
18.999 mm0.7480 in
|
13200 lbf58800 N
|
13500 lbf60100 N
|
3162 - 3129
|
3100
|
23.813 mm0.9375 in
|
76.2 mm3 in
|
39.573 mm1.5580 in
|
23.813 mm0.9375 in
|
39.741 mm1.5646 in
|
21300 lbf94800 N
|
22800 lbf102000 N
|
26093 - 26334
|
26000
|
23.813 mm0.9375 in
|
85.001 mm3.3465 in
|
18.923 mm0.7450 in
|
15.875 mm0.6250 in
|
18.999 mm0.7480 in
|
13200 lbf58800 N
|
13500 lbf60100 N
|
43096 - 43300
|
43000
|
24.384 mm0.9600 in
|
76.2 mm3 in
|
24.074 mm0.9478 in
|
16.670 mm0.6563 in
|
24.608 mm0.9688 in
|
20700 lbf92000 N
|
17100 lbf76200 N
|
43096 - 43312
|
43000
|
24.384 mm0.9600 in
|
79.375 mm3.1250 in
|
24.074 mm0.9478 in
|
17.463 mm0.6875 in
|
25.400 mm1.0000 in
|
20700 lbf92000 N
|
17100 lbf76200 N
|
43096 - 43326
|
43000
|
24.384 mm0.9600 in
|
82.550 mm3.2500 in
|
24.074 mm0.9478 in
|
17.463 mm0.6875 in
|
25.400 mm1.0000 in
|
20700 lbf92000 N
|
17100 lbf76200 N
|
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