CN114254474A - Method for analyzing bolt stress - Google Patents

Method for analyzing bolt stress Download PDF

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Publication number
CN114254474A
CN114254474A CN202011016533.0A CN202011016533A CN114254474A CN 114254474 A CN114254474 A CN 114254474A CN 202011016533 A CN202011016533 A CN 202011016533A CN 114254474 A CN114254474 A CN 114254474A
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China
Prior art keywords
bolt
analyzing
adapter
stress
analysis
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CN202011016533.0A
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Chinese (zh)
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李新宇
闫伟
秦向飞
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Beijing Foton Cummins Engine Co Ltd
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Beijing Foton Cummins Engine Co Ltd
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Priority to CN202011016533.0A priority Critical patent/CN114254474A/en
Publication of CN114254474A publication Critical patent/CN114254474A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention provides a method for analyzing bolt stress, which comprises the step of S01, constructing an engine fuel pump bolt connection analysis assembly model. And S02, importing the analysis assembly model into an analysis system. S03, defining the tensile strength UTSi of the internal thread material, the internal thread meshing area Ats and the tensile strength UTS of the bolt material in an analysis systemfBolt engagement area As and torque. And S04, calculating the safety margin of the bolt wire sliding load according to the parameters defined in the step S03. According to the method, the safety margin of the bolt wire sliding load can be obtained only based on the relevant parameters of the materials of the adapter and the bolt and the partial size data of the bolt and the mounting hole, and when the calculation result cannot meet the requirement of system stress, the safety of bolt connection can be improved by improving the material of the adapter, so that the analysis process is effectively simplified, and the problem of bolt connection is solved quickly.

Description

Method for analyzing bolt stress
Technical Field
The invention relates to the technical field of design of engine fuel pumps, in particular to a method for analyzing bolt stress.
Background
The novel fuel pump is introduced in the project, and aims to find more opportunities in the market and enable the engine to have stronger market competitiveness. For a fuel pump adapter, an existing analysis method for bolt stress generally performs calculation analysis based on parameters such as structure, space size and the like. When the calculation result cannot meet the requirement of the system stress, due to the limitation of the structure of the engine, the safety of the bolt connection cannot be improved by improving the structure and the space size so as to meet the production requirement.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a method for analyzing bolt stress, wherein most of the method is calculated and analyzed based on material parameters, when the calculation result cannot meet the requirement of system stress, the safety of bolt connection is improved by improving adapter materials, and the durability and reliability of the system are improved to meet the production requirement, so that the analysis process is effectively simplified, the problem of bolt connection is quickly solved, and the on-time production of products is ensured.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method of analyzing bolt stress comprising the steps of: and S01, constructing a bolt connection analysis assembly model of the engine fuel pump. And S02, importing the analysis assembly model into an analysis system. S03, defining the tensile strength UTSi of the internal thread material, the internal thread meshing area Ats and the tensile strength UTS of the bolt material in an analysis systemfBolt engagement area As and torque. S04, calculating the safety margin of the bolt wire sliding load according to the parameters defined in the step S03, wherein the safety margin Ms is UTSi multiplied by Ats/UTSf×As。
According to the method for analyzing the bolt stress, in the whole calculation and analysis process, the safety margin of the bolt wire sliding load can be obtained only based on the relevant parameters of the adapter and the bolt and the partial size data of the bolt and the mounting hole, when the calculation result cannot meet the requirement of the system stress, the safety of bolt connection can be improved by improving the adapter material, the durability and the reliability of the system are improved to meet the production requirement, so that the analysis process is effectively simplified, the problem of bolt connection is solved quickly, and the timely production of products is guaranteed.
With respect to the above technical solution, further improvements as described below can be made.
According to the method for analyzing bolt stress of the present invention, in a preferred embodiment, in step S03, the internal thread engagement area Ats ═ 3 pi EnLe/4. Wherein En is the pitch circle diameter of the internal thread, and Le is the meshing length.
Through the formula, the meshing area of the internal thread on the inner surface of the mounting hole in the adapter and the bolt can be calculated very accurately.
Specifically, in a preferred embodiment, in step S03, the bolt engagement area As is 0.785 (Esmin-0.2689P)2. Wherein Esmin is the diameter of the pitch circle of the bolt, and P is the thread pitch.
Through the formula, the meshing area of the internal thread on the bolt and the inner surface of the mounting hole on the adapter can be calculated very accurately.
Specifically, in one preferred embodiment, the analytical assembly model includes a fuel pump body, an adapter, and an engine block.
The analysis and assembly model can ensure the comprehensiveness and accuracy of calculation and analysis.
Further, in a preferred embodiment, in step S04, safety margins of the connecting bolts between the adapter and the fuel pump body and the connecting bolts between the adapter and the engine block are calculated, respectively.
Through all-round safety margin calculation that carries out bolted connection to the fuel pump adapter, can play more comprehensive analysis aassessment to the fuel pump adapter to obtain more comprehensive analysis result, the follow-up improvement of being convenient for.
Specifically, in a preferred embodiment, the material of the adapter is ductile iron 41025.
The material of the adapter is optimized to be ductile iron 41025, the thread sliding risk is obviously reduced, and the calculation result meets the requirement of system stress, so that the problem of the thread sliding risk existing in the existing material is quickly solved, and the product can be produced on time.
Specifically, in a preferred embodiment, the bolts in the analytical assembly model have dimensions M8 to M10.
The bolt size within the size range can be based on the actual condition of the product in the existing production, so that the true and reliable analysis result is ensured.
Specifically, in a preferred embodiment, the Pro/Engineer software is used to construct the analytical assembly model in step S01.
The conventional three-dimensional modeling software is adopted for modeling the analysis assembly model, so that the operation of developers in the conventional technology is facilitated, and the modeling efficiency is improved.
Specifically, in a preferred embodiment, the analysis system includes ANSYS Workbench software.
By adopting an ANSYS Workbench simulation platform, the structural statics and the structural dynamics of a complex mechanical system can be analyzed and simulated, so that the accuracy of an analysis result is ensured.
Compared with the prior art, the invention has the advantages that: in the whole calculation and analysis process, the safety margin of the bolt wire sliding load can be obtained only based on the relevant material parameters of the adapter and the bolt and partial size data of the bolt and the mounting hole, when the calculation result cannot meet the requirement of system stress, the safety of bolt connection can be improved by improving the adapter material, the durability and reliability of the system are improved to meet the production requirement, the analysis process is effectively simplified, the problem of bolt connection is solved rapidly, and the product is guaranteed to be produced on time.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates a split construction of an engine fuel pump of an embodiment of the present invention;
FIG. 2 schematically illustrates a bolted analytical model of an engine fuel pump of an embodiment of the present invention;
FIG. 3 schematically illustrates bolt force calculations for an engine fuel pump according to an embodiment of the present invention;
FIG. 4 schematically illustrates the safety margin for bolt stress when the fuel pump adapter of an embodiment of the present invention is cast iron 40001;
FIG. 5 schematically illustrates the safety margin of bolt force when the fuel pump adapter of an embodiment of the present invention is made of ductile iron 41025;
fig. 6 schematically shows a flow of a method of analyzing bolt stress according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
Fig. 1 schematically shows a split structure of an engine fuel pump 10 of an embodiment of the present invention. FIG. 2 schematically illustrates a bolted analytical model of an engine fuel pump of an embodiment of the present invention. FIG. 3 schematically illustrates bolt force calculations for an engine fuel pump according to an embodiment of the present invention. Fig. 4 schematically shows the safety margin of bolt force when the material of the fuel pump adapter of the embodiment of the present invention is cast iron 40001. Fig. 5 schematically illustrates the safety margin of bolt force when the fuel pump adapter of an embodiment of the present invention is made of ductile iron 41025. Fig. 6 schematically shows a flow of a method of analyzing bolt stress according to an embodiment of the present invention.
As shown in fig. 6, the method for analyzing bolt stress according to the embodiment of the present invention includes the following steps: and S01, constructing a bolt connection analysis assembly model of the engine fuel pump. And S02, importing the analysis assembly model into an analysis system. S03, defining the tensile strength UTSi of the internal thread material, the internal thread meshing area Ats and the tensile strength UTS of the bolt material in an analysis systemfBolt engagement area As and torque. S04, calculating the safety margin of the bolt wire sliding load according to the parameters defined in the step S03, wherein the safety margin Ms is UTSi multiplied by Ats/UTSf×As。
According to the method for analyzing the bolt stress, in the whole calculation and analysis process, the safety margin of the bolt wire sliding load can be obtained only based on the relevant parameters of the adapter and the bolt and the partial size data of the bolt and the mounting hole, when the calculation result cannot meet the requirement of the system stress, the safety of bolt connection can be improved by improving the adapter material, the durability and the reliability of the system are improved to meet the production requirement, so that the analysis process is effectively simplified, the problem of bolt connection is solved quickly, and the timely production of products is guaranteed.
Specifically, in the present embodiment, the Pro/Engineer software is used to construct the analytical assembly model in step S01. The conventional three-dimensional modeling software is adopted for modeling the analysis assembly model, so that the operation of developers in the conventional technology is facilitated, and the modeling efficiency is improved. Specifically, in the present embodiment, the analysis system includes ANSYS Workbench software. By adopting an ANSYS Workbench simulation platform, the structural statics and the structural dynamics of a complex mechanical system can be analyzed and simulated, so that the accuracy of an analysis result is ensured.
Specifically, in the method for analyzing the bolt stress according to the embodiment of the present invention, in step S03, the internal thread engagement area Ats is 3 pi EnLe/4. Wherein En is the pitch circle diameter of the internal thread, and Le is the meshing length. Through the formula, the meshing area of the internal thread on the inner surface of the mounting hole in the adapter and the bolt can be calculated very accurately. Specifically, in the present embodiment, in step S03, the bolt engagement area As is 0.785 (Esmin-0.2689P)2. Wherein Esmin is the diameter of the pitch circle of the bolt, and P is the thread pitch. Through the formula, the meshing area of the internal thread on the bolt and the inner surface of the mounting hole on the adapter can be calculated very accurately.
Specifically, as shown in fig. 1 and 2, in the present embodiment, a model engine fuel pump 10 is analytically assembled, specifically including a fuel pump body 1, an adapter 2, and an engine block 3, and a connecting bolt 4 between the adapter 2 and the fuel pump body 1 and the engine block 3, respectively. The analysis and assembly model can ensure the comprehensiveness and accuracy of calculation and analysis. Further, in the present embodiment, in step S04, the safety margin of the connecting bolt between the adapter and the fuel pump main body and the safety margin of the connecting bolt between the adapter and the engine block are calculated, respectively. Through all-round safety margin calculation that carries out bolted connection to the fuel pump adapter, can play more comprehensive analysis aassessment to the fuel pump adapter to obtain more comprehensive analysis result, the follow-up improvement of being convenient for.
Specifically, in the present embodiment, the materials of the adapter are set as cast iron 40001 and ductile iron 41025, respectively, and comparative analysis is performed, wherein the size of the bolt in the analysis device model is defined as M8, and with the bolt size within the above size range, the actual condition of the product in the existing production can be based, so as to ensure that the analysis result is true and reliable, and the torque is defined in the analysis system according to the actual standard requirement, and the stress result of the bolt is obtained, as shown in fig. 3. From the calculation results of fig. 4 and 5, it can be seen that: when the adapter material is cast iron 40001, the bolt is stressed and has a large risk of sliding, the safety margin is less than 1, and the system has a cracking risk. When the material of the adapter is optimized to be ductile iron 41025, the thread slipping risk is obviously reduced to a safe range, and the safety margin is more than 1. The calculation result meets the requirement of system stress, and the reliability and durability of fuel pump system connection are improved to a great extent, so that the problem of risk of thread slipping caused by existing materials is solved quickly, and the product can be produced on time.
According to the embodiment, the method for analyzing the bolt stress can obtain the safety margin of the bolt sliding load only based on the relevant parameters of the adapter and the bolt and the partial size data of the bolt and the mounting hole in the whole calculation and analysis process, and can improve the safety of bolt connection by improving the adapter material and improve the durability and reliability of a system to meet the production requirement when the calculation result cannot meet the requirement of the system stress, so that the analysis process is effectively simplified, the problem of bolt connection is solved quickly, and the product is ensured to be produced on time.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (9)

1. A method of analyzing bolt stress, comprising the steps of:
s01, constructing a bolt connection analysis assembly model of the engine fuel pump;
s02, importing the analysis assembly model into an analysis system;
s03, defining the tensile strength UTSi of the internal thread material, the internal thread meshing area Ats and the tensile strength UTS of the bolt material in an analysis systemfBolt engagement area As and torque;
s04, calculating the safety margin of the bolt wire sliding load according to the parameters defined in the step S03, wherein the safety margin Ms is UTSi multiplied by Ats/UTSf×As。
2. The method of analyzing bolt stress as claimed in claim 1, wherein, in step S03, said female screw engagement area Ats ═ 3 pi EnLe/4;
wherein En is the pitch circle diameter of the internal thread, and Le is the meshing length.
3. The method of analyzing bolt stress according to claim 1 or 2, wherein in step S03, said bolt engagement area As is 0.785 (Esmin-0.2689P)2；
Wherein Esmin is the diameter of the pitch circle of the bolt, and P is the thread pitch.
4. The method of analyzing bolt stress of claim 1 or 2, wherein the analytical assembly model comprises a fuel pump body, an adapter, and an engine block.
5. The method of analyzing bolt stress of claim 4, wherein in step S04, a safety margin of a tie bolt between the adapter and the fuel pump body and a safety margin of a tie bolt between the adapter and the engine block are calculated, respectively.
6. The method of analyzing bolt stress of claim 4, wherein said adapter material is ductile iron 41025.
7. The method of analyzing bolt stress according to claim 1 or 2, wherein the size of the bolt in the analytical assembly model is M8-M10.
8. The method of analyzing bolt stress according to claim 1 or 2, wherein the analytical assembly model is constructed using Pro/Engineer software in step S01.
9. The method of analyzing bolt stress of claim 1 or 2, wherein said analysis system comprises ANSYS Workbench software.
CN202011016533.0A 2020-09-24 2020-09-24 Method for analyzing bolt stress Pending CN114254474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011016533.0A CN114254474A (en) 2020-09-24 2020-09-24 Method for analyzing bolt stress

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011016533.0A CN114254474A (en) 2020-09-24 2020-09-24 Method for analyzing bolt stress

Publications (1)

Publication Number Publication Date
CN114254474A true CN114254474A (en) 2022-03-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011016533.0A Pending CN114254474A (en) 2020-09-24 2020-09-24 Method for analyzing bolt stress

Country Status (1)

Country Link
CN (1) CN114254474A (en)

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