Some standard content:
Machinery Industry Standard of the People's Republic of China
Hydraulic loading and unloading of interference fit
Subject content and scope of application
JB/T 6136-92
This standard specifies the interference fit Cooperate with the structural design specifications and loading and unloading requirements of hydraulic loading and unloading. This standard applies to hydraulic loading and unloading of interference fits of forged steel parts and steel castings calculated and selected in accordance with GB5371. Note: Hydraulic loading and unloading of interference fit is to apply pressure oil to the interference connection joint surface, which is located in the annular groove of the containing part or the contained part, causing elastic deformation of the containing part and the contained part to form a gap. The pressure oil forms an oil film between the joint surfaces. Under the action of external axial force, the containing part and the contained part are moved relative to each other to complete the loading and unloading work.
2 Reference Standards
GB5371
Calculation and Selection of Tolerances and Interference Fits
GB11334
GB11852 Conical Gauge Tolerances and Technical Conditions 3 Structural design specifications
3.1 Interference connections are divided into the following five types, of which Figure 1 is only suitable for hydraulic disassembly; the remaining four types can be directly installed and disassembled by hydraulic pressure.
Figure 1 cylindrical interference connection
Figure 3 conical interference connection
Figure 2 stepped cylindrical interference connection (see Figure 29 for details) Figure 4 outer conical belt Interference connection of intermediate sleeve
Figure 5 Interference connection of inner conical belt intermediate sleeve
The Ministry of Mechanical and Electronic Industry of the People's Republic of China approved 1992-06-09 and implemented on 1993-01-01
383
3.2 Annular groove and oil hole
JB/T6136-92
The annular groove should be arranged on one part and communicate with the oil hole. The type is shown in Figure 6 and Figure? . The dimensions of the annular groove and oil hole are shown in Table 1. Figure 6
5
0
≥30-50
>50～100
>100~～150
>150～ 200
>200～250
>250～300
>300～400
>400～ 500
>500～650||tt| |>650~800
>800~1000
2.5
3
5
7
8
10
12
14
16
18
Table 1
d,
2
2.5
3
4
5
5
6
7
8
10|| tt||12
12
3.3 The size and selection of the oil hole interface are shown in Figure 8, Table 2 and Table 3. Annular groove and oil hole size
H
0. 5
0. 5
0. 8
1
1.25|| tt||1. 5
1. 5
2
2.5
3
3
Figure 8 Oil hole interface|| tt||384
Figure 7
r
0. 4
2.5
3
4
4.5| |tt||6
7
8
10
12
12
0.4
0.6||tt ||1
1
1.6
1.6
1.6
2.5
2. 5
2. 5| |tt||2.5
mm
d
M10X1-6H
M14X1.5-6H
M18X1.5-6H
M27X2-6H
et
mm
30
>30~~50
≥50~100
二100~150| |tt||>150~~200
>200~250
>250~-300
>300~400
>400~500||tt| |>500～650
>650~800
>800～~1000
tt
5
8
8|| tt||12
M10X1-6H
JB/T6136-92
Table 2
()
120
120|| tt||120
120
Table 3
t,
10
12
16
18|| tt||Oil hole connection
Thread
M14X 1. 5-6H
A
4
M18 x 1. 5-6H|| tt||25
4
t
12
15
19
22
mm||tt| |M27X2-6H
A
A
3.4 ??The number and distribution of annular grooves
The number and distribution of annular grooves depend on the structural shape and combination length of the connecting parts. The distribution of annular grooves should ensure that there is a uniform pressure oil film on the entire joint surface during installation and disassembly. 3.4.1 The distribution of annular grooves for cylindrical interference connections is shown in Figures 9 to 12. The distribution dimensions are shown in Table 4. For inclusions with uneven wall thickness, consideration should be given to improving the pressure distribution when arranging the annular groove. The annular groove should be arranged under the webs and flanges, see Figures 13 to 15. Screw plug (sealed after welding)
There is an annular groove on the shaft in Figure 9
There is an annular groove on the hole in Figure 10
385
There are two on the shaft in Figure 11 Annular groove
Figure 13 Cylindrical interference connection with flange
on the side of the package
Figure 9, Figure 10
I.
JB/ T 6136—92
Picture 14 Inclusion component with single spoke plate
Cylindrical interference connection
Weir (sealed after welding)
Picture 12 on the hole There are two annular grooves
Pregnancy plug (sealed after welding)
Figure 15 The package has double spokes
Cylindrical interference connection
Table 4 Figure 9～Figure 12 Annular groove distribution size
Number of annular grooves
mWww.bzxZ.net
100
>100～300
Figure 11, Figure 12||tt ||>300～600
>600
(0. 3--0, 4)1
o.25
0.201.
0.151
(0. 5-0.
Note: When the number of annular grooves is three or four, the third and fourth annular grooves should be arranged in the interval to 12, 3.4 .2 The distribution of cylindrical interference coupling annular grooves for rolling bearings is shown in Figure 16~Figure 18. The dimensions are shown in Table 5. 386
Cylinder of a rolling bearing
Figure 16
shaped shaft (with An annular groove)
Picture
No.
Picture 16
Picture 17
Picture 18
B
JB/ T 6136-92
Picture 17
…cylindrical
shaped shaft of a rolling bearing (with two annular grooves)
Table 5 Figure 16~Figure 18 Bad-shaped groove Distribution size
11
mm
100
>100
any
(0.30.4)B
0.2 B
0.2R
Figure 18 Cylindrical
shaped shaft of two rolling bearings (with three annular grooves)
1.
(0. 5~ 0.6)B
0.68
t
(1.2-1.3)B
3.4.3. When the wall thickness of the conical interference connection is uniform, an annular groove is arranged, = (0.3~0.4)L or
(0. 3~0. 4)B*
(see picture) 19 to Figure 24, when the wall thickness of the containment component changes, two annular grooves should be arranged, see Figure 25. Figure 19
Interference connection with annular groove on conical shaft Figure 20 Interference connection with circular chain hole and annular groove 387
Figure 21 Inner conical shaft with intermediate sleeve 1||tt ||Interference connection with annular groove
JB/T 6136—92
Figure 22 on the outer conical belt with middle set hole
Interference connection with annular groove||tt ||Figure 24 Installing a roller on the tightening bushing
Conical interference connection of the bearing
Figure 23 Installing a roller on the conical shaft
Bearing interference connection||tt| |Figure 25 An outer conical interference connection with an intermediate sleeve and a flange on the side of the containing member
3.4.4 In order to facilitate disassembly, when designing an interference connection, the bonding surface of the containing member should exceed the bonding surface of the contained member Surface, see Figure 26 and Figure 27.
Disassembly direction
Figure 26 Interference fit without shoulder
27
Interference fit with shoulder
3.4.5 In order to use After assembly is completed, the high-pressure oil between the joint surfaces can be easily discharged. There should be a spiral oil groove connected with the bad groove on the joint surface of the containing component or the contained component. However, the oil groove must not extend beyond the joint surface. See Figure 28 for dimensions. 388
0.005
H is the press-in stroke
3.5 step cylindrical interference connection dimensions see Figure 29, JB/T6136-92
Figure 28
Figure 29 Stepped cylindrical interference connection
d, d diameter;;,. - Passage; l, l joint length: ls - distance between sealing cones; α - sealing cone angle (according to the size of the gain α = 0.5°1.5°) 4 loading and unloading requirements
General requirements
4.1
4.1.1 Before installation, impurities and burrs in the oil holes and annular grooves should be removed, and the joint surface, oil holes and annular grooves should be carefully cleaned with NY-190 solvent oil. . After installation, plug the oil hole with a screw plug. 4.1.2 The joint surface must not have cracks, scratches and defects. 4.1.3 In order to install and disassemble safely, safety precautions must be taken before installation and disassembly, and should be operated and monitored by experienced personnel. 4.1.4 The medium used for hydraulic installation and disassembly should be mineral oil with a kinematic viscosity of 46 to 68 cSt when the temperature is 40C. When the combined pressure is high, mineral oil with higher viscosity should be used
4.1.5 To calculate whether the material will undergo plastic deformation, the oil pressure during installation and disassembly should be used. 389
JB/T6136-92
4.1.6 When calculating the pressing manpower and pressing force, the calculation should be based on the friction coefficient during installation and disassembly. 4.1.7 The pressurization of the high-pressure oil pump should be gradual and continuous Only after the required calculated pressure is reached and remains stable can it be installed and disassembled. 4.2 Installation and disassembly of cylindrical interference connections 4.2.1 Cylindrical interference connections. It is generally installed by heating the containing component or cooling the contained component. 4.2.2 During disassembly, pressure can be applied to the cylindrical surface and the axial direction at the same time, but the axial oil pressure P? is approximately one-fifth of the cylindrical surface oil pressure. When the cylindrical surface oil pressure reaches the calculated disassembly pressure , the containing part (or contained part) can be pulled out without interruption. Special attention should be paid to safety during the pulling out process, and the oil pressure should be kept stable (see Figure 30). Figure 30
4.3 Installation and disassembly of stepped cylindrical interference connection Disassembly of cylindrical interference connection
4.3.1 The combination length of stepped cylindrical interference connection is 1, and 12 (see figure 29), the oil pressure during the installation process is obtained through good contact between the 10° guide cone of the containing component and the α cone of the contained component to form a seal. 1: Dimensions of both parts should meet the requirements. 4.3.2 Tighten the handle so that the 10° guide cone of the containing member is in good contact with the α cone part of the contained member to form a pressure area. The pressure oil deforms the containing member and the contained member to form an oil film. Under the action of the axial force, the The containing component or the contained component moves axially to complete the installation (see Figure 31). 4.3.3 During disassembly, when the pressure oil deforms the two parts to form an oil film, the shaft begins to move under the action of axial force. At this time, special attention should be paid to the force generated in the axial direction due to the different sizes of the stepped cylinder dd. will be greater than the axial force applied at the beginning, so when disassembling, safety measures should be taken in advance to prevent the shaft (or sleeve) from being ejected after the disassembly is completed. 4.4 Installation and disassembly of conical interference connection (see Figure 32) Figure 31
4.4.1 Press the starting point of the stroke during installation, and use one of the following methods according to the connection situation a.
The average diameter position of the sleeve is the starting point of the pressing stroke: Figure 32
b, push the containing member and the middle sleeve by hand until they stop, and the position in this state is the starting point of the pressing stroke;.| |tt||390
Apply 5% of the pressing force, and the position in this state is the starting point of the pressing stroke JB/T 6136-92
4.4.2 Injecting continuous pressure While adding oil, use the installation tool (or hydraulic device) to push the shaft and intermediate sleeve to the specified assembly position. 4.4.3 The pressing force during installation is calculated according to formula (1): pr=(pmin -+Apt+U · pemin)rdm2t(μ++ In the formula: pl--
PImin
Ap
U? plain
d.
pressure force, N;
minimum bonding pressure required to transmit load, MPa; pressure required for deformation of the intermediate sleeve (none The conical connection of the intermediate sleeve, no such value), MPa: oil pressure increment, MPa. The U value is shown in Figure 33, and the smaller value should be selected; the average diameter of the conical joint surface, mm;
-the joint length, mm;
r
·Liquid friction coefficient;
Taper of combined cone
4.4.4 The push-out force during disassembly is calculated according to formula (2): p2=( prmin +Apt+U·pimin)rdml(where: p2
pfmin
Apr
U·pimin
dm
t||tt| | 4 | Oil pressure increment, MPa, U value is shown in Figure 33, the larger value should be selected; average diameter of the conical joint surface, mm;
joining length, mm;
liquid friction coefficient;||tt ||The taper of the combined cone.
4.4.5 The connection with large taper, when
da/dm
2.0
1.75F
1.5
2
1.0
Note: dh in the figure is the outer diameter of the containing member, mm +
(1)||tt. ||.(2)
≤0, it has self-unloading capability. Safety measures should be taken during disassembly to prevent the coupling parts from automatically springing 0.1
0.2
1. ||tt| |Figure 33
4
n
391
5. In order to make the high-pressure oil between the joint surfaces easy to drain after assembly is completed, there should be a spiral oil groove connected with the bad groove on the joint surface of the containing component or the contained component. However, the oil groove must not extend beyond the joint surface. See Figure 28 for dimensions. 388
0.005
H is the press-in stroke
3.5 step cylindrical interference connection dimensions see Figure 29, JB/T6136-92
Figure 28
Figure 29 Stepped cylindrical interference connection
d, d diameter;;,. - Passage; l, l joint length: ls - distance between sealing cones; α - sealing cone angle (according to the size of the gain α = 0.5°1.5°) 4 loading and unloading requirements
General requirements
4.1
4.1.1 Before installation, impurities and burrs in the oil holes and annular grooves should be removed, and the joint surface, oil holes and annular grooves should be carefully cleaned with NY-190 solvent oil. . After installation, plug the oil hole with a screw plug. 4.1.2 The joint surface must not have cracks, scratches and defects. 4.1.3 In order to install and disassemble safely, safety precautions must be taken before installation and disassembly, and should be operated and monitored by experienced personnel. 4.1.4 The medium used for hydraulic installation and disassembly should be mineral oil with a kinematic viscosity of 46 to 68 cSt when the temperature is 40C. When the combined pressure is high, mineral oil with higher viscosity should be used
4.1.5 To calculate whether the material will undergo plastic deformation, the oil pressure during installation and disassembly should be used. 389
JB/T6136-92
4.1.6 When calculating the pressing manpower and pressing force, the calculation should be based on the friction coefficient during installation and disassembly. 4.1.7 The pressurization of the high-pressure oil pump should be gradual and continuous Only after the required calculated pressure is reached and remains stable can it be installed and disassembled. 4.2 Installation and disassembly of cylindrical interference connections 4.2.1 Cylindrical interference connections. It is generally installed by heating the containing component or cooling the contained component. 4.2.2 During disassembly, pressure can be applied to the cylindrical surface and the axial direction at the same time, but the axial oil pressure P? is approximately one-fifth of the cylindrical surface oil pressure. When the cylindrical surface oil pressure reaches the calculated disassembly pressure , the containing part (or contained part) can be pulled out without interruption. Special attention should be paid to safety during the pulling out process, and the oil pressure should be kept stable (see Figure 30). Figure 30
4.3 Installation and disassembly of stepped cylindrical interference connection Disassembly of cylindrical interference connection
4.3.1 The combination length of stepped cylindrical interference connection is 1, and 12 (see figure 29), the oil pressure during the installation process is obtained through good contact between the 10° guide cone of the containing component and the α cone of the contained component to form a seal. 1: Dimensions of both parts should meet the requirements. 4.3.2 Tighten the handle so that the 10° guide cone of the containing member is in good contact with the α cone part of the contained member to form a pressure area. The pressure oil deforms the containing member and the contained member to form an oil film. Under the action of the axial force, the The containing component or the contained component moves axially to complete the installation (see Figure 31). 4.3.3 During disassembly, when the pressure oil deforms the two parts to form an oil film, the shaft begins to move under the action of axial force. At this time, special attention should be paid to the force generated in the axial direction due to the different sizes of the stepped cylinder dd. will be greater than the axial force applied at the beginning, so when disassembling, safety measures should be taken in advance to prevent the shaft (or sleeve) from being ejected after the disassembly is completed. 4.4 Installation and disassembly of conical interference connection (see Figure 32) Figure 31
4.4.1 Press the starting point of the stroke during installation, and use one of the following methods according to the connection situation a.
The average diameter position of the sleeve is the starting point of the pressing stroke: Figure 32
b, push the containing member and the middle sleeve by hand until they stop, and the position in this state is the starting point of the pressing stroke;.| |tt||390
Apply 5% of the pressing force, and the position in this state is the starting point of the pressing stroke JB/T 6136-92
4.4.2 Injecting continuous pressure While adding oil, use the installation tool (or hydraulic device) to push the shaft and intermediate sleeve to the specified assembly position. 4.4.3 The pressing force during installation is calculated according to formula (1): pr=(pmin -+Apt+U · pemin)rdm2t(μ++ In the formula: pl--
PImin
Ap
U? plain
d.
pressure force, N;
minimum bonding pressure required to transmit load, MPa; pressure required for deformation of the intermediate sleeve (none The conical connection of the intermediate sleeve, no such value), MPa: oil pressure increment, MPa. The U value is shown in Figure 33, and the smaller value should be selected; the average diameter of the conical joint surface, mm;
-the joint length, mm;
r
·Liquid friction coefficient;
Taper of combined cone
4.4.4 The push-out force during disassembly is calculated according to formula (2): p2=( prmin +Apt+U·pimin)rdml(where: p2
pfmin
Apr
U·pimin
dm
t||tt| | 4 | The oil pressure increment, MPa, U value is shown in Figure 33, the larger value should be selected; the average diameter of the conical joint surface, mm;
joint length, mm;
liquid friction coefficient;||tt ||The taper of the combined cone.
4.4.5 The connection with large taper, when
da/dm
2.0
1.75F
1.5
2
1.0
Note: dh in the figure is the outer diameter of the containing member, mm +
(1)||tt. ||.(2)
≤0, it has self-unloading capability. Safety measures should be taken during disassembly to prevent the coupling parts from automatically springing 0.1
0.2
1. ||tt| |Figure 33
4
n
391
5. In order to make the high-pressure oil between the joint surfaces easy to drain after assembly is completed, there should be a spiral oil groove connected with the bad groove on the joint surface of the containing component or the contained component. However, the oil groove must not extend beyond the joint surface. See Figure 28 for dimensions. 388
0.005
H is the press-in stroke
3.5 step cylindrical interference connection dimensions see Figure 29, JB/T6136-92
Figure 28
Figure 29 Stepped cylindrical interference connection
d, d diameter;;,. - Passage; l, l joint length: ls - distance between sealing cones; α - sealing cone angle (according to the size of the gain α = 0.5°1.5°) 4 loading and unloading requirements
General requirements
4.1
4.1.1 Before installation, impurities and burrs in the oil holes and annular grooves should be removed, and the joint surface, oil holes and annular grooves should be carefully cleaned with NY-190 solvent oil. . After installation, plug the oil hole with a screw plug. 4.1.2 The joint surface must not have cracks, scratches and defects. 4.1.3 In order to install and disassemble safely, safety precautions must be taken before installation and disassembly, and should be operated and monitored by experienced personnel. 4.1.4 The medium used for hydraulic installation and disassembly should be mineral oil with a kinematic viscosity of 46 to 68 cSt when the temperature is 40C. When the combined pressure is high, mineral oil with higher viscosity should be used
4.1.5 To calculate whether the material will undergo plastic deformation, the oil pressure during installation and disassembly should be used. 389 | | tt | | JB/T6136-92 | Only after the required calculated pressure is reached and remains stable can it be installed and disassembled. 4.2 Installation and disassembly of cylindrical interference connections 4.2.1 Cylindrical interference connections. It is generally installed by heating the containing component or cooling the contained component. 4.2.2 During disassembly, pressure can be applied to the cylindrical surface and the axial direction at the same time, but the axial oil pressure P? is approximately one-fifth of the cylindrical surface oil pressure. When the cylindrical surface oil pressure reaches the calculated disassembly pressure , the containing part (or contained part) can be pulled out without interruption. Special attention should be paid to safety during the pulling out process, and the oil pressure should be kept stable (see Figure 30). Figure 30
4.3 Installation and disassembly of stepped cylindrical interference connection Disassembly of cylindrical interference connection
4.3.1 The combination length of stepped cylindrical interference connection is 1, and 12 (see figure 29), the oil pressure during the installation process is obtained through good contact between the 10° guide cone of the containing component and the α cone of the contained component to form a seal. 1: Dimensions of both parts should meet the requirements. 4.3.2 Tighten the handle so that the 10° guide cone of the containing member is in good contact with the α cone part of the contained member to form a pressure area. The pressure oil deforms the containing member and the contained member to form an oil film. Under the action of the axial force, the The containing component or the contained component moves axially to complete the installation (see Figure 31). 4.3.3 During disassembly, when the pressure oil deforms the two parts to form an oil film, the shaft begins to move under the action of axial force. At this time, special attention should be paid to the force generated in the axial direction due to the different sizes of the stepped cylinder dd. will be greater than the axial force applied at the beginning, so when disassembling, safety measures should be taken in advance to prevent the shaft (or sleeve) from being ejected after the disassembly is completed. 4.4 Installation and disassembly of conical interference connection (see Figure 32) Figure 31
4.4.1 Press the starting point of the stroke during installation, and use one of the following methods according to the connection situation a.
The average diameter position of the sleeve is the starting point of the pressing stroke: Figure 32
b, push the containing member and the middle sleeve by hand until they stop, and the position in this state is the starting point of the pressing stroke;.| |tt||390
Apply 5% of the pressing force, and the position in this state is the starting point of the pressing stroke JB/T 6136-92
4.4.2 Injecting continuous pressure While adding oil, use the installation tool (or hydraulic device) to push the shaft and intermediate sleeve to the specified assembly position. 4.4.3 The pressing force during installation is calculated according to formula (1): pr=(pmin -+Apt+U · pemin)rdm2t(μ++ In the formula: pl--
PImin
Ap
U? plain
d.
pressure force, N;
minimum bonding pressure required to transmit load, MPa; pressure required for deformation of the intermediate sleeve (none The conical connection of the intermediate sleeve, no such value), MPa: oil pressure increment, MPa. The U value is shown in Figure 33, and the smaller value should be selected; the average diameter of the conical joint surface, mm;
-the joint length, mm;
r
·Liquid friction coefficient;
Taper of combined cone
4.4.4 The push-out force during disassembly is calculated according to formula (2): p2=( prmin +Apt+U·pimin)rdml(where: p2
pfmin
Apr
U·pimin
dm
t||tt| | 4 | Oil pressure increment, MPa, U value is shown in Figure 33, the larger value should be selected; average diameter of the conical joint surface, mm;
joining length, mm;
liquid friction coefficient;||tt ||The taper of the combined cone.
4.4.5 The connection with large taper, when
da/dm
2.0
1.75F
1.5
2
1.0
Note: dh in the figure is the outer diameter of the containing member, mm +
(1)||tt. ||.(2)
≤0, it has self-unloading capability. Safety measures should be taken during disassembly to prevent the coupling parts from automatically springing 0.1
0.2
1. ||tt| |Figure 33
4
n
391
2. Tighten the handle so that the 10° guide cone of the containing member is in good contact with the α cone part of the contained member to form a pressure area. The pressure oil deforms the containing member and the contained member to form an oil film. Under the action of the axial force, the containing member is Or the included component moves axially to complete the installation (see Figure 31). 4.3.3 During disassembly, when the pressure oil deforms the two parts to form an oil film, the shaft begins to move under the action of axial force. At this time, special attention should be paid to the force generated in the axial direction due to the different sizes of the stepped cylinder dd. will be greater than the axial force applied at the beginning, so when disassembling, safety measures should be taken in advance to prevent the shaft (or sleeve) from being ejected after the disassembly is completed. 4.4 Installation and disassembly of conical interference connection (see Figure 32) Figure 31
4.4.1 Press the starting point of the stroke during installation, and use one of the following methods according to the connection situation a.
The average diameter position of the sleeve is the starting point of the pressing stroke: Figure 32
b, push the containing member and the middle sleeve by hand until they stop, and the position in this state is the starting point of the pressing stroke;.| |tt||390
Apply 5% of the pressing force, and the position in this state is the starting point of the pressing stroke JB/T 6136-92
4.4.2 Injecting continuous pressure While adding oil, use the installation tool (or hydraulic device) to push the shaft and intermediate sleeve to the specified assembly position. 4.4.3 The pressing force during installation is calculated according to formula (1): pr=(pmin -+Apt+U · pemin)rdm2t(μ++ In the formula: pl--
PImin
Ap
U? plain
d.
pressure force, N;
minimum bonding pressure required to transmit load, MPa; pressure required for deformation of the intermediate sleeve (none The conical connection of the intermediate sleeve, no such value), MPa: oil pressure increment, MPa. The U value is shown in Figure 33, and the smaller value should be selected; the average diameter of the conical joint surface, mm;
-the joint length, mm;
r
·Liquid friction coefficient;
Taper of combined cone
4.4.4 The push-out force during disassembly is calculated according to formula (2): p2=( prmin +Apt+U·pimin)rdml(where: p2
pfmin
Apr
U·pimin
dm
t||tt| | 4 | The oil pressure increment, MPa, U value is shown in Figure 33, the larger value should be selected; the average diameter of the conical joint surface, mm;
joint length, mm;
liquid friction coefficient;||tt ||The taper of the combined cone.
4.4.5 The connection with large taper, when
da/dm
2.0
1.75F
1.5
2
1.0
Note: dh in the figure is the outer diameter of the containing member, mm +
(1)||tt. ||.(2)
≤0, it has self-unloading capability. Safety measures should be taken during disassembly to prevent the coupling parts from automatically springing 0.1
0.2
1. ||tt| |Figure 33
4
n
391
2 Tighten the handle to make the 10° guide cone of the containing part and the α cone part of the contained part in good contact to form a pressure area. The pressure oil deforms the containing part and the contained part to form an oil film. Under the action of the axial force, the containing part or the contained part moves axially to complete the installation (see Figure 31). 4.3.3 During disassembly, when the pressure oil deforms the two parts to form an oil film, the shaft begins to move under the action of the axial force. At this time, special attention should be paid to the different sizes of the stepped cylinder dd. The force generated in the axial direction will be greater than the axial force applied at the beginning. Therefore, during disassembly, safety measures should be taken in advance to prevent the shaft (or sleeve) from being ejected after disassembly. 4.4 Installation and disassembly of conical interference fit joints (see Figure 32) Figure 31
4.4.1 The starting point of the pressing stroke during installation shall be determined by one of the following methods according to the connection conditions. a.
The average diameter position of the intermediate sleeve shall be taken as the starting point of the pressing stroke: Figure 32
b. Push the containing part and the intermediate sleeve by hand until they stop, and the position in this state shall be taken as the starting point of the pressing stroke; .
390
Apply a force of 5% of the pressing force, and the position in this state shall be taken as the starting point of the pressing stroke JB/T 6136-92
4.4.2 While continuously injecting pressurized oil, use the installation tool (or hydraulic device) to push the shaft and the intermediate sleeve to the specified assembly position. 4.4.3 The press-in force during installation is calculated according to formula (1): pr = (pmin - + Apt + U · pemin) rdm2t (μ++ Where: pl--
PImin
Ap
U? prain
d.
Pressing force, N;
Minimum joint pressure required to transfer load, MPa; Pressure required for deformation of intermediate sleeve (no such value for conical connection without intermediate sleeve), MPa: Oil pressure increment, MPa. U value is shown in Figure 33, and the smaller value should be selected; Average diameter of conical joint surface, mm;
-Joint length, mm;
r
·Liquid friction coefficient;
Conicity of joint cone
4.4.4 The press-out force during disassembly is calculated according to formula (2): p2 = (prmin + Apt + U· pimin)rdml(where: p2
pfmin
Apr
U· pimin
dm
t
4
Extrusion force, N;
Minimum joint pressure required to transfer load, MPa; Pressure required for deformation of intermediate sleeve (no such value for cone joint method without intermediate sleeve), MPa Oil pressure increment, MPa, U value is shown in Figure 33, the larger value should be selected; Average diameter of cone joint surface, mm;
Joining length, mm;
Liquid friction coefficient;
-Taper of joint cone.
4.4.5 For connections with large taper of mating surface, when
comes out.
da/dm
2.0
1.75F
1.5
2
1.0
Note: dh in the figure is the outer diameter of the containing part, mm. +
（１）
.(2)
≤0, it has self-unloading ability. Safety measures should be taken during disassembly to prevent the connection parts from automatically popping out 0.1
0.2
1.
Figure 33
4
n
391
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