CN115824012A - Method for detecting journal contact rate of marine crankshaft - Google Patents
Method for detecting journal contact rate of marine crankshaft Download PDFInfo
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- CN115824012A CN115824012A CN202111090872.8A CN202111090872A CN115824012A CN 115824012 A CN115824012 A CN 115824012A CN 202111090872 A CN202111090872 A CN 202111090872A CN 115824012 A CN115824012 A CN 115824012A
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- detection
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- shaft neck
- contact
- tile
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Abstract
The invention provides a method for detecting the contact rate of a journal of a marine crankshaft, which comprises the following steps: preparing a detection tool, wherein the detection tool comprises a tile plate, a handle arranged on the back surface of the tile plate and a detection plate arranged on the inner surface of the tile plate, and colored ointment is uniformly coated in a detection arc surface of the detection plate; during detection, the handle is held by hand, the detection tool is placed on the circumferential surface of the processed shaft neck, the detection cambered surface is made to be in contact with the circumferential surface of the shaft neck, and then the handle is held by hand to push the detection tool, so that the detection cambered surface slides along the circumferential direction along with the circumferential surface of the shaft neck; and (4) removing the detection tool from the journal, and observing whether the contact color on the circumferential surface of the journal is uniform, wherein the uniform contact color represents a pass. The invention realizes the detection of the contact rate of the shaft neck of the marine crankshaft, can visually judge whether the coaxiality of each part of the processed shaft neck is qualified or not, and has the advantages of convenient detection and high efficiency.
Description
Technical Field
The invention belongs to the technical field of manufacturing of marine crankshafts, and particularly relates to a method for detecting the contact rate of a journal of a marine crankshaft.
Background
The crankshaft is one of the most important parts in the engine through which all the power of the engine is output, and therefore, the quality of the crankshaft, which is a core component of the diesel engine, is critical to the overall engine life. The following steps are required to be carried out in the process of processing and manufacturing the crankshaft: the method comprises the following steps of crankshaft single part processing, crankshaft shrinkage fit (sleeving a whole crankshaft), crankshaft integral processing, crankshaft flange hole processing and the like.
The machining of the journal is involved in the machining of the individual parts. The processed shaft neck needs good coaxiality at each position, if the coaxiality has problems, the bending degree of the crankshaft after shrinkage fit is large, the single-side processing allowance of the shaft neck during the integral processing of the crankshaft is only 5mm, and the bending degree of the crankshaft is large, so that the shaft neck cannot be processed qualified during the integral processing of the crankshaft. And the coaxiality of all parts is difficult to detect in the machining process due to the large size of the shaft neck.
Disclosure of Invention
The present invention provides a method for detecting a contact rate of a journal of a marine crankshaft, so as to overcome the disadvantages of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for detecting the contact rate of a journal of a marine crankshaft is characterized by comprising the following steps:
preparing a detection tool, wherein the detection tool comprises a tile plate, a handle arranged on the back of the tile plate and a detection plate arranged on the inner surface of the tile plate, the tile plate and the detection plate are both of arc tile-shaped structures, the detection plate is made of babbitt metal, the inner surface of the protected detection plate is a detection arc surface with standard coaxiality, and the detection arc surface is uniformly coated with colored ointment;
during detection, the handle is held by hand, the detection tool is placed on the circumferential surface of the processed shaft neck, the detection cambered surface is made to be in contact with the circumferential surface of the shaft neck, and then the handle is held by hand to push the detection tool, so that the detection cambered surface slides along the circumferential direction along with the circumferential surface of the shaft neck;
and after sliding for 15-25 degrees, taking off the detection tool from the shaft neck, and observing whether the contact color on the circumferential surface of the shaft neck is uniform or not, wherein the uniform contact color represents qualified, the non-uniform contact color represents unqualified, and the part with dark color represents a high point and needs to be further polished.
In a preferred embodiment of the present invention, the detection plate and the tile are cast together, the inner surface of the tile has a dovetail groove, and the detection plate has a protrusion embedded in the dovetail groove, so that the detection plate and the tile are tightly connected.
In a preferred embodiment of the present invention, the arc angle of the detection plate is 60 °.
By adopting the technical scheme, the detection tool with the arc tile-shaped structure slides on the circumferential surface of the shaft neck, and the babbitt metal is relatively soft, so that the color of the ointment can be attached to the circumferential surface of the shaft neck when the ointment is rubbed with the shaft neck, and whether the coaxiality processing of all parts of the shaft neck is qualified or not can be judged by observing whether the contact color on the circular surface of the shaft neck is uniform or not. Therefore, the invention realizes the detection of the contact rate of the shaft neck of the marine crankshaft, can visually judge whether the coaxiality of all parts of the processed shaft neck is qualified or not, and has the advantages of convenient detection and high efficiency.
Drawings
FIG. 1 is a schematic diagram of a detection tool used in the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
fig. 3 is a sectional view taken along line B-B in fig. 1.
Detailed Description
The journal contact ratio detection method of the marine crankshaft according to the present invention will be described in detail with reference to the accompanying drawings.
In this example, the journal contact rate of a machined marine crankshaft having a diameter of 582mm was measured, and the specific procedure was as follows.
Before detection, a detection tool needs to be prepared. As shown in fig. 1-3, the inspection tool includes a tile 100, a pull handle 200 provided at the back of the tile 100, and an inspection plate 300 provided at the inner surface of the tile 100.
The tile plate 100 and the detection plate 300 are both arc tile-shaped structures, wherein the detection plate 300 is made of babbitt metal. The diameter of the circular arc of the inner surface of the detection plate 300 is the same as the diameter of the processed shaft neck, namely, the diameter of the circular arc of the inner surface is 582 mm. The inner surface of the detection plate 300 is used as a detection arc surface 301, and the coaxiality of all positions is required to be consistent, namely the coaxiality standard.
The detection plate 300 and the tile plate 100 are connected together in a pouring mode, the inner surface of the tile plate 100 is provided with a plurality of horizontally extending dovetail grooves 101, the detection plate 300 is provided with a plurality of horizontally extending protrusions 302 embedded in the dovetail grooves 101, and the detection plate 300 and the tile plate 100 are tightly connected through the structure.
To increase the strength of the shingle 100, a plurality of ribs 102 are also provided on the back of the shingle.
The handle 200 is horizontally fixed at a middle position of the back surface of the tile 100 by a bolt 201.
In addition, the inner surface of the detection plate 300, namely the detection arc surface 301, needs to be fully coated with colored ointment, and the coating thickness is 0.02-0.05mm. The oil painting pigment can be used as the oil painting pigment, for example, the oil painting pigment is used for painter with a musa americana card, the color is blue, and the arc angle α of the detection plate is 60 °.
During detection, the handle 200 is held by hand to place a detection tool on the circumferential surface of the processed shaft neck, so that the detection cambered surface 301 is in contact with the circumferential surface of the shaft neck, and then the handle 200 is held by hand to push the detection tool so that the detection cambered surface 301 slides along the circumferential direction.
After the detection tool slides on the journal for 20 degrees approximately, the detection tool is taken off from the journal, and whether the contact color on the circumferential surface of the journal is uniform or not is observed; the contact color is uniform and qualified; the contact color is not uniform, which indicates that the contact is unqualified, and the part with dark color indicates a high point, and the high point needs to be further polished.
After the grinding is finished, the detection tool needs to be placed on the circumferential surface of the journal again to slide for detection, and the detection is repeated until the contact color on the circumferential surface of the journal is observed to be uniform.
The above is the journal contact ratio detection method of the marine crankshaft of the present invention, however, it should be recognized by those skilled in the art that the above embodiments are only used for illustrating the present invention and are not used as limitations of the present invention, and changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (3)
1. A method for detecting the contact rate of a journal of a marine crankshaft is characterized by comprising the following steps:
preparing a detection tool, wherein the detection tool comprises a tile plate, a handle arranged on the back of the tile plate and a detection plate arranged on the inner surface of the tile plate, the tile plate and the detection plate are both of arc tile-shaped structures, the detection plate is made of babbitt metal, the inner surface of the protected detection plate is a detection arc surface with standard coaxiality, and the detection arc surface is uniformly coated with colored ointment;
during detection, the handle is held by hand, the detection tool is placed on the circumferential surface of the processed shaft neck, the detection cambered surface is made to be in contact with the circumferential surface of the shaft neck, and then the handle is held by hand to push the detection tool, so that the detection cambered surface slides along the circumferential direction along with the circumferential surface of the shaft neck;
and after the sliding is 15-25 degrees, taking off the detection tool from the shaft neck, and observing whether the contact color on the circumferential surface of the shaft neck is uniform or not, wherein the uniform contact color represents qualified, the non-uniform contact color represents unqualified, and the part with deep color represents a high point and needs to be further polished.
2. The method for detecting a journal contact ratio of a marine crankshaft according to claim 1, wherein: the detection plate and the tile plate are poured together, a dovetail groove is formed in the inner surface of the tile plate, and a protrusion embedded into the dovetail groove is formed in the detection plate.
3. The method for detecting the journal contact ratio of a marine crankshaft as set forth in claim 1, wherein the arc angle of the detection plate is 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111090872.8A CN115824012A (en) | 2021-09-17 | 2021-09-17 | Method for detecting journal contact rate of marine crankshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111090872.8A CN115824012A (en) | 2021-09-17 | 2021-09-17 | Method for detecting journal contact rate of marine crankshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115824012A true CN115824012A (en) | 2023-03-21 |
Family
ID=85515610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111090872.8A Pending CN115824012A (en) | 2021-09-17 | 2021-09-17 | Method for detecting journal contact rate of marine crankshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115824012A (en) |
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2021
- 2021-09-17 CN CN202111090872.8A patent/CN115824012A/en active Pending
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