CN110057278B - Method for testing surface contact area of crankshaft journal of engine - Google Patents
Method for testing surface contact area of crankshaft journal of engine Download PDFInfo
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- CN110057278B CN110057278B CN201910113336.1A CN201910113336A CN110057278B CN 110057278 B CN110057278 B CN 110057278B CN 201910113336 A CN201910113336 A CN 201910113336A CN 110057278 B CN110057278 B CN 110057278B
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- 238000012360 testing method Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000000694 effects Effects 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 238000007689 inspection Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 59
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 102200116582 rs387906914 Human genes 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/003—Measuring of motor parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/26—Measuring arrangements characterised by the use of mechanical techniques for measuring areas, e.g. planimeters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to a method for testing the contact area of the surface of a crankshaft journal of an engine, which is used as a special standard test block and a special test tile for the crankshaft journal of the engine, wherein a layer of blue oil is uniformly smeared on the crankshaft journal during test, and the thickness of the blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the checking tile are measured, whether the crankshaft is qualified or not is judged according to the distribution condition of the blue oil on the checking tile, the contact area and the contact effect of the journal surface of the crankshaft of the engine and the sliding bearing bush can be checked, the operation is convenient, and the detection is accurate.
Description
Technical Field
The invention relates to a method for checking the surface contact area of an engine crankshaft journal in the engine technology.
Background
The crankshaft is one of the most important parts in the engine, bears the power transmitted by the connecting rod, converts the power into torque, and drives other accessories on the engine to move through the output of the crankshaft; the crankshaft is required to bear the combined action of centrifugal force of rotating mass, gas inertia force which changes periodically and reciprocating inertia force to cause bending torsion load action, so that the crankshaft is required to have enough strength and rigidity, the surface of a journal is required to be wear-resistant, work is uniform and balance is good, after the traditional crankshaft is machined, only the dimensional precision, position precision and surface roughness of the journal are usually concerned in the inspection process, the contact area and the contact effect of the journal surface and a sliding bearing bush are also critical in the actual work of the crankshaft, if the contact area of the journal surface and the sliding bearing bush is poor, only a few small points or a certain area are contacted, the stress is uneven, a lubricating oil film is easy to damage, so that the contact point is damaged due to friction, and the heat productivity is large, so that the bearing temperature is increased; in the traditional method, the contact area and the contact effect of the journal surface and the sliding bearing bush cannot be checked after the assembly is completed, the good contact area of the journal surface and the sliding bearing bush cannot be ensured, the stress is uniform, and the problems of large heating value and bearing temperature rise are prevented.
Disclosure of Invention
The invention aims to solve the technical problem of providing the method for detecting the contact area of the surface of the crankshaft journal of the engine, which can detect the contact area and the contact effect of the surface of the crankshaft journal of the engine and the sliding bearing bush, and is convenient to operate and accurate in detection.
The invention relates to an engine crankshaft journal a method for inspecting the surface contact area of a substrate, the method is characterized in that: the method comprises the following steps:
firstly, preparing a standard test block and a test tile for the journal of the crankshaft of the engine;
According to the drawing of the engine crankshaft, manufacturing a standard test block and a test tile of the crankshaft journal, wherein the outer diameter of the standard test block is consistent with that of the crankshaft journal, the surface is polished and is not allowed to be concave, the total width of the standard test block is 145-155 mm, and the flatness and the parallelism are less than or equal to 0.01mm; the test tile is matched with a standard test block, and the arc degree of the test tile is 58-62 degrees;
Secondly, uniformly coating a layer of blue oil on a crankshaft journal, and measuring the thickness of a blue oil film by using a wet film thickness gauge;
when in inspection, a layer of blue oil is uniformly smeared on the surface of a crankshaft journal to be inspected, the thickness of an oil film of the blue oil is controlled within a design standard value, the thickness of the oil film of the blue oil is measured by using a wet film thickness gauge, and the smearing thickness meets the requirement and can be subjected to subsequent inspection;
Thirdly, checking the relative movement of the bush and the crankshaft journal;
the method comprises the steps of simulating the contact of the journal surface with a sliding bearing bush by utilizing the relative movement of a checking tile and a crankshaft journal, placing a crankshaft to be checked on a special stacking rack for the crankshaft during specific checking, attaching the checking tile to the surface of the crankshaft journal, and pushing the checking tile to slide for several times at a constant speed within the range of 120 DEG on the surface of the crankshaft journal;
Measuring the residual area and effect of the blue oil on the test tile;
judging whether the machined crankshaft is qualified or not by measuring the residual area and effect of the blue oil on the test tile; the blue oil is required to be uniformly distributed on the inspection tile, and the poor contact of a certain small point or a certain area is allowed to exist, and the whole contact area is required to be more than or equal to 65 percent, particularly based on the crankshaft to be inspected;
Fifthly, recording and checking the blue oil distribution condition on the checking tile;
The total width of the standard test block in the first step is 150mm, and the radian of the test tile is 60 degrees;
the first step is to test that an AlSn6 veneer layer with the thickness of 5mm is stuck on the inner side of the tile;
The first step is that the inspection tile is connected with a handle through 2M 10 threaded holes;
the thickness of an oil film of the blue oil in the second step is controlled within 4 mu m;
The wet film thickness gauge in the second step is a Holland TQC VF2255 wet film thickness gauge, and the measuring range is 0-100 mu m;
and in the fifth step, the blue oil distribution condition on the test tile is recorded in the test record table by using a rubbing method and is used as the basis of crankshaft acceptance.
The invention relates to a method for testing the contact area of the surface of a crankshaft journal of an engine, which is matched with a special standard test block and a special test tile for the crankshaft journal of the engine, wherein a layer of blue oil is uniformly smeared on the crankshaft journal during test, and the thickness of a blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the checking tile are measured, whether the crankshaft is qualified or not is judged according to the distribution condition of the blue oil on the checking tile, the contact area and the contact effect of the surface of the crankshaft journal of the engine and the sliding bearing bush can be checked, the operation is convenient, and the detection is accurate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a crankshaft to be inspected in an embodiment of the present invention;
FIG. 2 is a schematic view of a first view structure of a standard test block according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second view structure of a standard test block according to an embodiment of the present invention;
FIG. 4 is a schematic view of a first view of a test tile according to an embodiment of the present invention;
FIG. 5 is a schematic view of a second view angle configuration of an inspection tile according to an embodiment of the present invention;
FIG. 6 is a flow chart of an embodiment of the present invention.
Detailed Description
As shown in the figure, the method for testing the contact area of the surface of the journal of the crankshaft of the engine comprises the following specific design ideas:
the invention relates to the technical field of engines, in particular to a method for testing the contact area of the surface of a crankshaft journal of an engine.
The invention provides a method for testing the contact area of the surface of a crankshaft journal of an engine, and belongs to the technical field of engines. The method comprises the steps of firstly, preparing a special engine crankshaft journal standard test block and a special engine crankshaft journal standard test tile; when in inspection, a layer of blue oil is uniformly smeared on a crankshaft journal, and the thickness of the blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the test tile are measured, and the distribution condition of the blue oil on the test tile is used as the basis of acceptance of the crankshaft.
The crankshaft is one of the most important components in an engine. The engine is used for bearing the force transmitted by the connecting rod, converting the force into torque, outputting the torque through the crankshaft and driving other accessories on the engine to work. The crankshaft is subjected to the combined action of centrifugal force of the rotating mass, periodically-changed gas inertia force and reciprocating inertia force, so that the crankshaft is subjected to bending and torsion loads. Therefore, the crankshaft is required to have enough strength and rigidity, and the journal surface needs to be wear-resistant, uniform in work and good in balance. After machining is completed, only the dimensional accuracy, the positional accuracy and the surface roughness of the journal are often concerned in the inspection of the crankshaft. In actual operation of the crankshaft, the contact area and the contact effect of the journal surface and the sliding bearing bush are important, if the contact area of the journal surface and the sliding bearing bush is not good, the contact is only performed at a certain small point or a certain area, so that an oil film is damaged, the friction force generated by the pressure born by the contact is necessarily much larger than that of the contact even place, and therefore, the heat generated during operation is large, and the bearing temperature is necessarily high. On the contrary, if the surface of the journal is well contacted with the sliding bearing bush, the stress is uniform everywhere, the oil film of the friction surface is complete, and when the bearing is operated, heat is also emitted, but the heat is smaller and is distributed on the whole bearing, and the heat is easy to dissipate, so that the bearing cannot generate high heat. However, after assembly, the contact area and the contact effect of the journal surface with the sliding bearing cannot be checked.
In view of this, how to solve the test of the contact area and the contact effect between the journal surface of the engine crankshaft and the sliding bearing bush, so that the processing acceptance requirement of the crankshaft is close to the actual working state, is a problem that the technicians in the industry need to solve.
The invention aims to provide a method for testing the surface contact area of an engine crankshaft journal, which overcomes the defects of the prior art and needs to be matched with a special engine crankshaft journal standard test block and a special engine crankshaft journal standard test tile; when in inspection, a layer of blue oil is uniformly smeared on a crankshaft journal, and the thickness of the blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the test tile are measured, and the distribution condition of the blue oil on the test tile is used as the basis of acceptance of the crankshaft.
Embodiments of the present invention are implemented as follows:
The embodiment of the invention provides a method for testing the surface contact area of an engine crankshaft journal, which comprises the steps that a special engine crankshaft journal standard test block and a special engine crankshaft journal test tile are needed to be matched for the first time; when in inspection, a layer of blue oil is uniformly coated on a crankshaft journal, and the thickness of the blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the test tile are measured.
In particular to a method for testing the contact area of the surface of a crankshaft journal of an engine, which comprises the following steps:
(1) A standard test block 2 and a test shoe 3, which are fitted as journals for a dedicated engine crankshaft 1;
According to the crankshaft drawing of the engine, a special crankshaft journal standard test block 2 and a special crankshaft journal test tile 3 are manufactured, the outer diameter of the standard test block is consistent with the outer diameter of the crankshaft journal, the surface of the standard test block is required to be polished and is not allowed to be concave, the width of the whole standard test block can be controlled to be about 150mm, and the flatness and the parallelism are controlled to be within 0.01 mm; the test tile is matched according to a standard test block, the radian of the whole test tile is selected to be 60 degrees, an AlSn6 thin plate with the thickness of 5mm is stuck on the inner side, the surface of a crankshaft journal is prevented from being scratched in the test process, and the test tile can be connected with a handle through 2M 10 threaded holes, so that the test operation is convenient.
(2) Uniformly coating a layer of blue oil on a crankshaft journal, and measuring the thickness of a blue oil film by using a wet film thickness gauge;
When in inspection, a layer of blue oil is uniformly smeared on the surface of a crankshaft journal to be inspected, the thickness of an oil film of the blue oil is controlled within 4 mu m, the thickness of the oil film of the blue oil is measured by a wet film thickness meter, and the smearing thickness meets the requirement, so that the subsequent inspection can be performed.
Checking relative movement of the shoe and the crankshaft journal;
The relative movement of the check bush and the crankshaft journal is utilized to simulate the contact between the journal surface and the sliding bearing bush,
In the specific inspection, in order to facilitate operation and safety, the crankshaft to be inspected is placed on a special stacking rack for the crankshaft, and the inspection tile is attached to the surface of the crankshaft journal, and only the inspection tile is required to slide for several times within the range of 120 degrees on the surface of the crankshaft journal.
(4) The residual area and effect of blue oil on the test tile were measured.
And judging whether the machined crankshaft is qualified or not by measuring the residual area and effect of the blue oil on the test tile. The blue oil is required to be uniformly distributed on the test tile, so that poor contact on a certain small point or a certain area is allowed, and the contact area of the whole test tile is required to be more than or equal to 65 percent, particularly according to the crankshaft to be tested. The blue oil distribution condition on the test tile can be subjected to rubbing on a test record table for examination, and the blue oil distribution condition is used as the basis of qualified crankshaft acceptance.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
Accordingly, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, are intended to be within the scope of the present invention.
Example 1
The present embodiment provides a crankshaft of a marine medium speed diesel engine L27P, referring to fig. 1 to 6.
1) A standard test block 2 and a test shoe 3, which are fitted as journals for a dedicated engine crankshaft 1;
According to a marine medium-speed diesel engine L27P crankshaft drawing, manufacturing a special crankshaft journal standard test block and a special crankshaft journal test tile, wherein the outer diameter of the standard test block is consistent with the outer diameter of the L27P crankshaft journal, and is phi 250-0.035mm, the surface roughness is within 0.4 after polishing treatment, the concave is not allowed, the width of the whole standard test block can be controlled to be 150 mm, and the flatness and parallelism are controlled to be within 0.01 mm; the test tile is matched according to a standard test block, the radian of the whole test tile is selected to be 600, an AlSn6 thin plate with the thickness of 5mm and the inner diameter of phi 250+/-0.01 mm is stuck on the inner side, the surface of a crankshaft journal is prevented from being scratched in the test process, and the test tile is connected with a handle through 2M 10 threaded holes, so that the test operation is convenient.
(2) Uniformly coating a layer of blue oil on a crankshaft journal, and measuring the thickness of a blue oil film by using a wet film thickness gauge;
When in inspection, a layer of blue oil is uniformly smeared on the surface of a crankshaft journal to be inspected, the blue oil is scraped by using Permatex in the United states, and the thickness of an oil film of the blue oil is controlled within 4 mu m. The thickness of the blue oil film is measured by a wet film thickness meter, the wet film thickness meter is selected from the Holland TQC VF2255 wet film thickness meter, the measuring range is 0-100 mu m, and the subsequent inspection can be carried out when the thickness of the blue oil film is smeared to meet the requirement.
Checking relative movement of the shoe and the crankshaft journal;
The relative movement of the check bush and the crankshaft journal is utilized to simulate the contact between the journal surface and the sliding bearing bush,
In the specific inspection, in order to facilitate operation and safety, the crankshaft to be inspected is placed on a stacking rack special for the crankshaft, and the inspection tile is attached to the surface of the crankshaft journal, and only the inspection tile needs to slide at a constant speed within the range of the surface 1200 of the crankshaft journal for several times.
(4) The residual area and effect of blue oil on the test tile were measured.
And judging whether the machined crankshaft is qualified or not by measuring the residual area and effect of the blue oil on the test tile. The blue oil is required to be uniformly distributed on the test tile, so that poor contact on a certain small point or a certain area is allowed, but poor contact on a large area is not allowed, the whole contact area is required to be more than or equal to 65%, and sample sealing treatment can be performed. Meanwhile, the blue oil distribution condition on the test tile is subjected to rubbing on a test record table for searching, and the blue oil distribution condition is used as the basis of crankshaft acceptance check.
In summary, the present invention provides a method for testing the surface contact area of an engine crankshaft journal, comprising the steps of first requiring to be configured as a dedicated engine crankshaft journal standard test block and test shoe; when in inspection, a layer of blue oil is uniformly smeared on a crankshaft journal, and the thickness of the blue oil film is measured by a wet film thickness gauge; simulating the contact between the journal surface and the sliding bearing bush by using the relative movement of the check bearing bush and the crankshaft journal; finally, the residual area and effect of the blue oil on the test tile are measured. The tool required by the inspection method has the advantages of simple structure, low manufacturing cost, simple and convenient operation, and reliable inspection result, and the inspection result is close to the actual condition that the surface of the crankshaft journal contacts with the sliding bearing bush.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An engine crankshaft journal surface contact area inspection method is characterized in that: the method comprises the following steps:
firstly, preparing a standard test block and a test tile for the journal of the crankshaft of the engine;
According to the engine crankshaft drawing, manufacturing a standard test block and a test tile of the crankshaft journal, wherein the outer diameter of the standard test block is consistent with that of the crankshaft journal, the surface is polished and is not allowed to be concave, the total width of the standard test block is 145-155 mm, and the flatness and the parallelism are less than or equal to 0.01 mm; the checking tile is matched with a standard checking block, and the radian of the checking tile is 58-62 degrees;
Secondly, uniformly coating a layer of blue oil on a crankshaft journal, and measuring the thickness of a blue oil film by using a wet film thickness gauge;
when in inspection, a layer of blue oil is uniformly smeared on the surface of a crankshaft journal to be inspected, the thickness of an oil film of the blue oil is controlled within a design standard value, the thickness of the oil film of the blue oil is measured by using a wet film thickness gauge, and the smearing thickness meets the requirement and can be subjected to subsequent inspection;
Thirdly, checking the relative movement of the bush and the crankshaft journal;
the method comprises the steps of simulating the contact of the journal surface with a sliding bearing bush by utilizing the relative movement of a checking tile and a crankshaft journal, placing a crankshaft to be checked on a special stacking rack for the crankshaft during specific checking, attaching the checking tile to the surface of the crankshaft journal, and pushing the checking tile to slide for several times at a constant speed within the range of 120 DEG on the surface of the crankshaft journal;
Measuring the residual area and effect of the blue oil on the test tile;
Judging whether the machined crankshaft is qualified or not by measuring the residual area and effect of the blue oil on the test tile; the blue oil is required to be uniformly distributed on the inspection tile, and the poor contact of a certain small point or a certain area is allowed to exist, and the whole contact area is required to be more than or equal to 65 percent according to the specific combination of the crankshaft to be inspected;
And fifthly, recording and checking the blue oil distribution condition on the test tile.
2. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: the total width of the standard test block in the first step is 150mm, and the radian of the test tile is 60 degrees.
3. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: and in the first step, an AlSn6 veneer layer with the thickness of 5 mm is stuck on the inner side of the test tile.
4. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: the first step is to connect the test tile with a handle through 2M 10 threaded holes.
5. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: and in the second step, the thickness of an oil film of the blue oil is controlled within 4 mu m.
6. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: the wet film thickness gauge in the second step is a Holland TQC VF2255 wet film thickness gauge, and the measuring range is 0-100 μm.
7. The method for inspecting engine crankshaft journal surface contact area according to claim 1, wherein: and in the fifth step, the blue oil distribution condition on the test tile is recorded in the test record table by using a rubbing method and is used as the basis of crankshaft acceptance.
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| CN201910113336.1A CN110057278B (en) | 2019-02-14 | 2019-02-14 | Method for testing surface contact area of crankshaft journal of engine |
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| CN113074603A (en) * | 2021-03-16 | 2021-07-06 | 上海中船三井造船柴油机有限公司 | Tool and method for detecting fitting degree of crankshaft journal and bearing bush |
| CN113267113B (en) * | 2021-05-18 | 2022-11-29 | 重庆齿轮箱有限责任公司 | Method for testing assembly precision of radial sliding bearing |
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