CN112571352B - Bolt connection tightening method with self-locking nut - Google Patents
Bolt connection tightening method with self-locking nut Download PDFInfo
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- CN112571352B CN112571352B CN202011383001.0A CN202011383001A CN112571352B CN 112571352 B CN112571352 B CN 112571352B CN 202011383001 A CN202011383001 A CN 202011383001A CN 112571352 B CN112571352 B CN 112571352B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
- B25B13/50—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes
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Abstract
The application belongs to the field of self-locking nut application, and particularly relates to a bolt connection tightening method with a self-locking nut, which comprises the following steps: step one, mounting a self-locking nut, a connected piece and a connecting bolt together, and pre-screwing the self-locking nut by using a torque wrench; step two, loosening the screwed self-locking nut; step three, corner control in the screwing process; step five, judging whether the pre-tightening result after the tightening angle is applied is qualified; if the bolt is qualified, the bolt with the self-locking nut is connected and screwed; otherwise, the torque wrench is used for supplementing the limiting force until the limiting force is qualified. According to the bolt connection screwing method with the self-locking nuts, the self-locking torque of each self-locking nut is measured independently, the initial torque value of the nut during rotation angle control is formulated according to the self-locking torque of each self-locking nut, the consistency of the joint state of the bolt connection and a machine part during rotation angle control is ensured, the pre-tightening precision of the bolt connection is improved, and the failure risk is reduced.
Description
Technical Field
The application belongs to the field of self-locking nut application, and particularly relates to a bolt connection tightening method with a self-locking nut.
Background
The bolt connection is the most commonly used connection method in engineering, the assembly process is simple to operate, and a torque angle method is taken as a commonly used bolt connection process method; however, when the torque angle method is used, a fixed torque value is obtained at the starting point of angle measurement, so that a torque error caused by the self-locking torque of the self-locking nut cannot be avoided, and the pre-tightening precision is low.
Disclosure of Invention
In order to solve at least one of the technical problems, the application provides a bolt connection tightening method with a self-locking nut.
The application discloses a bolt connection tightening method with a self-locking nut, which comprises the following steps:
step one, installing the self-locking nut, the connected piece and the connecting bolt together, screwing the self-locking nut by using a torque wrench, and setting the torque value as follows: the maximum self-locking torque value of the self-locking nut is exceeded, but is within the safe torque range of bolt connection;
loosening the screwed self-locking nut to enable the connected piece to be separated from the self-locking nut, but the connected piece does not fall off from the connecting bolt;
tightening the self-locking nut, measuring the magnitude of tightening torque in real time in the tightening process, and taking the sum of the average value of the tightening torque and the corresponding torque value as a turning angle control starting point when the tightening torque exceeds the average value of the tightening torque of the self-locking nut and is continuously increased;
step four, acquiring a first angle required to rotate by the self-locking nut from a rotation angle measurement starting point according to the pre-tightening force required to be applied by the bolt connection, then screwing the self-locking nut forward to a value of the first angle plus a first preset angle, and then loosening the rotation angle of the value of the first preset angle in a reverse direction;
step five, judging whether the pre-tightening result after the tightening angle is applied in the step four is qualified; if the bolt is qualified, the bolt with the self-locking nut is connected and screwed; otherwise, the torque wrench is used for supplementing the limiting force until the limiting force is qualified.
According to at least one embodiment of the present application, the first step is to set the torque value of the torque wrench to be more than 1.5 times of the maximum self-locking torque value of the self-locking nut.
According to at least one embodiment of the present application, in the third step, the corresponding torque value is calculated according to the bolt connection pretightening force error allowed by the connecting piece, wherein the corresponding torque value is greater than 0 and smaller than the maximum bolt connection pretightening force error.
According to at least one embodiment of the present application, the third step specifically includes:
step 3.1, measuring the magnitude of tightening torque once every other second preset angle from the beginning of tightening the self-locking nut, and calculating the average value of the tightening torque in the second preset angle range;
step 3.2, forming a functional relation between the average value of the tightening torque and the measuring times, and performing curve fitting;
3.3, when the average value difference of two adjacent tightening torques is large and the three adjacent average values are in a sequentially ascending state, recording the last average value at the moment as the average value of the tightening torques;
and 3.4, continuing to perform the screwing operation, and increasing the connecting torque to the sum of the average value of the screwing torque and the corresponding torque value, namely the initial point of the rotation angle measurement.
According to at least one embodiment of the application, the second predetermined angle is any value in the range of less than 0.5 °.
According to at least one embodiment of the present application, in the fourth step, the first preset angle is greater than 5 ° and smaller than 10 °.
According to at least one embodiment of the application, in the step five, if the supplementary limit force through the fixed torque wrench still cannot meet the requirement, the failed nut is replaced, the connecting bolt set is disassembled, and the operation is executed again until the operation is qualified.
The application has at least the following beneficial technical effects:
according to the bolt connection tightening method with the self-locking nuts, the self-locking torque of each self-locking nut is measured independently, the initial torque value of the nut during corner control is set according to the self-locking torque of each self-locking nut, the consistency of the joint state of the bolt connection and a machine part during corner control is guaranteed, the pre-tightening precision of the bolt connection is improved, and the risk that the connected part fails due to the low pre-tightening precision of the bolt connection is reduced.
Drawings
FIG. 1 is a flow chart of a method for tightening a bolt connection with a self-locking nut according to the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are some, but not all embodiments of the disclosure. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The method for tightening the bolt connection with the self-locking nut according to the present invention will be described in further detail with reference to fig. 1.
The application discloses bolted connection screwing method of taking self-locking nut mainly includes several parts such as bolted connection is screwed up in advance, is loosened self-locking nut, among the screwing process self-locking moment and corner measurement initial point confirm, corner control, the inspection of final bolted connection pretightning force, specifically, can include following step:
step one, bolt connection pre-tightening:
with the auto-lock nut, by connecting piece and connecting bolt installation together, screw up the auto-lock nut with torque wrench, and the moment value sets up to: the maximum self-locking torque value of the self-locking nut is exceeded, but the maximum self-locking torque value is within the safe torque range of bolt connection. Further, it is preferable that the torque value of the torque wrench is set to be 1.5 times greater than the maximum self-locking torque value of the self-locking nut.
Step two, loosening the self-locking nut:
and loosening the tightened self-locking nut to ensure that the connected piece is separated from the self-locking nut but the connected piece does not fall off the connecting bolt.
Step three, determining a self-locking torque and a rotation angle measurement initial point in the screwing process:
and slowly screwing the self-locking nut, measuring the magnitude of the screwing torque in real time in the screwing process, and taking the sum (namely M + N) of the average value M of the screwing torque and the corresponding torque value N as a rotation angle control starting point (called rotation angle control starting angle) when the screwing torque exceeds the average value M of the screwing torque of the self-locking nut and is continuously increased. Preferably, the corresponding torque value N is calculated according to bolt connection pretightening force errors allowed by the connecting piece, wherein the number of the pieces is 0 and N < the maximum bolt connection pretightening force error.
Further, the third step specifically comprises the following steps:
3.1, starting from the screwing of the self-locking nut, measuring the magnitude of the screwing torque once every other second preset angle, and calculating the average value m of the screwing torque within the range of the second preset angle; wherein the second predetermined angle is preferably any value in the range of less than 0.5 °;
step 3.2, forming a functional relation between the average value m of the tightening torque and the measuring times, and performing curve fitting;
3.3, when the difference between the average values M of two adjacent tightening torques is large and the three adjacent average values M are in a sequentially rising state, recording the last average value M at the moment as the average value M of the tightening torques;
and 3.4, continuing to perform the tightening operation, and increasing the connecting torque to the sum (namely M + N) of the average value of the tightening torque and the corresponding torque value, namely the starting point of the rotation angle measurement.
Step four, corner control:
according to the pretightening force required by bolt connection, a first rotating angle alpha required by the self-locking nut from a rotating angle measuring starting point is obtained, then an angle value (namely alpha + beta) formed by adding the first rotating angle alpha and a first preset angle beta is screwed in the forward direction, and then a rotating angle with the angle value of the first preset angle beta is loosened in the reverse direction. The first angle alpha is obtained by calculating the pitch, the structural size and the elastic modulus of the connecting bolt, and the structural size and the elastic modulus of the connected piece; the first preset angle β may take any value within the parameter limits of the connecting bolt, the connected piece, preferably 5 ° < β <10 °.
Step five, pre-tightening force inspection:
judging whether the pre-tightening result after the tightening angle is applied in the step four is qualified or not; if the bolt is qualified, the bolt with the self-locking nut is connected and screwed; otherwise, the torque wrench is used for supplementing the limiting force until the limiting force is qualified.
In addition, if the force limit cannot be met through supplementing the torque-fixing wrench, the failed nut is replaced, the connecting bolt group is disassembled, and the operation is executed again until the qualified condition is achieved.
In summary, in the conventional tightening process, the self-locking torque of the self-locking nuts in the same batch is regarded as the same fixed data, and a maximum self-locking torque value exceeding the self-locking nuts in the same batch is regarded as an initial rotation angle measuring point in the tightening process, so that the difference of the self-locking nuts is ignored, the difference between the attachment states of the bolt connection and the machine part is large during rotation angle measurement of the nuts, and finally the pre-tightening precision of the bolt connection is low.
According to the bolt connection tightening method with the self-locking nuts, the tightening process of bolt connection with the self-locking nuts is optimized, the self-locking torque of each self-locking nut is measured independently, the initial torque value of the nut during corner control is set according to the self-locking torque of each self-locking nut, the condition that the bolt connection is consistent with the fitting state of a machine part during corner control is guaranteed, the pre-tightening precision of the bolt connection is improved, and the risk that the connected part fails due to the low pre-tightening precision of the bolt connection is reduced.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A bolt connection tightening method with a self-locking nut is characterized by comprising the following steps:
step one, installing a self-locking nut, a connected piece and a connecting bolt together, screwing the self-locking nut by using a torque wrench, and setting a torque value as follows: the maximum self-locking torque value of the self-locking nut is exceeded, but is within the safe torque range of bolt connection;
loosening the screwed self-locking nut to enable the connected piece to be separated from the self-locking nut, but the connected piece does not fall off from the connecting bolt;
tightening the self-locking nut, measuring the magnitude of tightening torque in real time in the tightening process, and taking the sum of the average value of the tightening torque and the corresponding torque value as a turning angle control starting point when the tightening torque exceeds the average value of the tightening torque of the self-locking nut and is continuously increased;
step four, according to the pre-tightening force required to be applied by bolt connection, acquiring a first angle required to rotate by the self-locking nut from a rotation angle measurement starting point, then forwardly screwing a value of the first angle plus a first preset angle, and then reversely loosening a rotation angle of the first preset angle;
step five, judging whether the pre-tightening result after the tightening angle is applied in the step four is qualified; if the bolt is qualified, the bolt with the self-locking nut is connected and screwed; otherwise, supplementing the limiting force through a fixed torque wrench until the limiting force is qualified;
the third step specifically comprises:
step 3.1, measuring the magnitude of tightening torque once every other second preset angle from the beginning of tightening the self-locking nut, and calculating the average value of the tightening torque in the second preset angle range;
step 3.2, forming a functional relation between the average value of the tightening torque and the measuring times, and performing curve fitting;
3.3, when the average value difference of two adjacent tightening torques is large and the three adjacent average values are in a sequentially ascending state, recording the last average value at the moment as the average value of the tightening torques;
and 3.4, continuing to perform the screwing operation, and increasing the connecting torque to the sum of the average value of the screwing torque and the corresponding torque value, namely the initial point of the rotation angle measurement.
2. The method of tightening a bolt connection with a self-locking nut according to claim 1, wherein in the first step, the torque value of the torque wrench is set to be 1.5 times greater than the maximum self-locking torque value of the self-locking nut.
3. The method according to claim 1, wherein in the third step, the corresponding torque value is calculated according to the bolt connection pretightening force error allowed by the connecting member, and the corresponding torque value is greater than 0 and smaller than the maximum bolt connection pretightening force error.
4. The method of tightening a bolted connection with a self-locking nut according to claim 1, characterized in that said second predetermined angle is any value within the range of less than 0.5 °.
5. The method of tightening a bolt connection with a self-locking nut according to claim 1, wherein in the fourth step, the first predetermined angle is greater than 5 ° and less than 10 °.
6. The method for tightening a bolt connection with a self-locking nut according to claim 1, wherein in the fifth step, if the supplementary limit force by the constant torque wrench still cannot meet the requirement, the failed nut is replaced, and the connecting bolt group is disassembled and the operation is performed again until the operation is qualified.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011383001.0A CN112571352B (en) | 2020-12-01 | 2020-12-01 | Bolt connection tightening method with self-locking nut |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011383001.0A CN112571352B (en) | 2020-12-01 | 2020-12-01 | Bolt connection tightening method with self-locking nut |
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| CN112571352B true CN112571352B (en) | 2022-10-28 |
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| CN113798837A (en) * | 2021-10-11 | 2021-12-17 | 大连理工大学 | Bolt tightening method of friction device and friction device thereof |
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| JPH07100715A (en) * | 1993-09-30 | 1995-04-18 | Tonichi Seisakusho:Kk | Method for controlling screw tightening in multiple spindle screw tightening machine |
| DE102008001817A1 (en) * | 2008-05-16 | 2009-11-19 | Robert Bosch Gmbh | Screw connection tightening method, involves tightening screw connection during temporal stage until torque increases and continuing tightening of screw connection during another temporal stage |
| CN103100850A (en) * | 2013-01-31 | 2013-05-15 | 东风康明斯发动机有限公司 | Engine connecting rod bolt screwing craft through torque and turn angle |
| CN107341280A (en) * | 2016-11-25 | 2017-11-10 | 安徽江淮汽车集团股份有限公司 | A kind of computational methods of bolt angle method tightening technique |
| CN109396813B (en) * | 2017-08-17 | 2021-02-09 | 上海蔚来汽车有限公司 | Bolt locking method, battery replacement pack installation system and battery replacement pack installation method |
| CN109238546A (en) * | 2018-08-24 | 2019-01-18 | 大连理工大学 | A kind of tools for bolts ' pretension force prediction method based on machine learning |
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