CN212512978U - Device for detecting surface area of excircle matching surface of crankshaft journal - Google Patents
Device for detecting surface area of excircle matching surface of crankshaft journal Download PDFInfo
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- CN212512978U CN212512978U CN202021420643.9U CN202021420643U CN212512978U CN 212512978 U CN212512978 U CN 212512978U CN 202021420643 U CN202021420643 U CN 202021420643U CN 212512978 U CN212512978 U CN 212512978U
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Abstract
The utility model discloses a crankshaft journal excircle matching surface area detection device, which comprises a handle, a cuboid detection tool and an area detection plate matched with the detection tool; the width of the cuboid gauge is matched with the width of the excircle matching surface of the crankshaft journal, the length is 80-100 mm, the thickness is 15-20 mm, and the roughness of the two maximum planes is less than Ra0.1; the upper edge and the lower edge of the left side surface and the right side surface of the cuboid detection tool are respectively turned into an upper chamfer and a lower chamfer of 45 degrees, the chamfer distance is 7-8 mm, the area detection plate is a rectangular plate made of transparent materials, square grids are carved on the rectangular plate, and the area of each grid is 1 square mm. The device simple structure has adopted the principle that detects at the fitting surface painting, can realize on-line measuring and control, can realize effectively fast and detect and judge the compliance of crankshaft journal excircle surface fitting surface area to through customer's verification to the product, satisfied customer's performance requirement.
Description
Technical Field
The utility model belongs to the technical field of the internal-combustion engine spare part is made, a large-scale ship electric engine crankshaft machining is related to, specifically a crankshaft journal excircle fitting surface area detection device and detection method.
Background
The crankshaft is a key component of the transmission system of the internal combustion engine, and during operation, the thrust force of the connecting rod is converted into a rotational force, so that torque is generated, and the heat energy generated by the combustion of fuel is converted into mechanical energy of mechanical rotation through a crank-connecting rod mechanism. The engine mainly outputs power through relative motion between a crankshaft journal and a sliding bearing bush, the performance and the service life of the engine are directly influenced by the geometric form of the journal surface, and the size of the surface matching area of the journal directly reflects the geometric shape error or the surface geometric unevenness. The wear failure of the crankshaft is the main failure mode of the engine, and the failure of the crankshaft is accelerated due to local uneven eccentric wear caused by poor lubrication and uneven stress on a shaft neck. The effective size of the matching area of the excircle of the crankshaft journal directly influences the lubricating effect and the stress uniformity of the journal, and the influence of a large marine crankshaft is more obvious due to large load. In order to ensure the effectiveness of the matching surface area, a customer can clearly require the matching surface area proportion requirement of the journal on a crankshaft product diagram, the matching surface area of the journal is required to be detected by 100% in the grinding process, and 100% of the joint surface is required to meet the specified requirement.
In a crankshaft product being processed by the company, a client clearly requires in a technical protocol that the area of the matching surface of the outer circle of a crankshaft journal cannot be less than 70%, the area of the matching surface of the crankshaft journal is required to be detected by 100% in the grinding process, and 100% of a binding surface is required to meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the 100% on-line measuring requirement of crankshaft journal excircle fitting surface area that the customer provided, provide a crankshaft journal excircle fitting surface area detection device, the device simple structure can realize on-line measuring and control to detection method easy operation is convenient, can realize detecting and judging the compliance of crankshaft journal excircle surface fitting surface area fast effectively, and through the verification of customer to the product, has satisfied customer performance requirement.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the area detection device comprises a handle, a cuboid detection tool and an area detection plate matched with the cuboid detection tool;
the handle and the cuboid gauge are integrally formed or detachably connected;
the width of the cuboid gauge is matched with the width of the excircle matching surface of the crankshaft journal, the length is 80-100 mm, and the thickness is 15-20 mm;
the upper edge and the lower edge of the left side surface and the right side surface of the cuboid gauge are respectively turned into an upper chamfer and a lower chamfer of 45 degrees, and the chamfer distance is 7-8 mm;
a positive plane is formed between the upper chamfer and the lower chamfer;
the flatness of the front and back maximum planes of the cuboid detection tool for detection is less than or equal to 2 micrometers, and the roughness is less than Ra0.1;
the area detection plate is a rectangular plate made of transparent materials, the width of the area detection plate is matched with the width of the excircle matching surface of the crankshaft journal, and the length of the area detection plate is 45-50 mm;
square grids are carved on the area detection plate, and the area of each grid is 1 square millimeter.
The outer surface of the handle is provided with anti-skid grains.
The thickness of the area detection plate is 1-2 mm, and a handle integrally formed with the area detection plate is arranged on the area detection plate.
When the detection is carried out, the cuboid detection tool needs to be matched with red lead, a layer of red lead with the thickness of less than or equal to 4 microns is uniformly coated on the surface of the cuboid detection tool when the cuboid detection tool is used, and a wet film thickness roller is adopted to detect whether the thickness of the red lead meets the requirement. During detection, the number of grids of the region where red lead is not attached to the outer circle surface of the crankshaft journal can be rapidly calculated through the area detection plate, the number of grids of the region where red lead is not attached is divided by the number of grids of the region where red lead is attached, and therefore the area proportion of the region where red lead is attached can be obtained, and the area of the surface matching surface of the outer circle surface of the crankshaft journal is obtained.
The detection method of the device for detecting the area of the excircle matching surface of the crankshaft journal comprises the following steps:
1) uniformly coating a red lead layer on a detection plane of a cuboid detection tool of the detection device, wherein the thickness of the red lead layer is less than or equal to 4 mu m, and detecting whether the thickness of the red lead meets the requirement by adopting a wet film thickness roller;
2) cleaning a detected crankshaft journal, grasping a handle of a detection device, pressing a detection surface of a cuboid detection tool coated with red lead on the surface of the excircle of the detected crankshaft journal, pressing down and rotating in a small range, wherein the width of a detection area is more than 20mm, so that the cuboid detection tool and the journal move relatively, and the red lead is fully contacted with the excircle of the journal and is tightly attached to the excircle of the journal; if the external circle matching degree of the crankshaft journal is good, the red lead can be uniformly and continuously attached to the external circle surface of the journal; if the external circle matching degree of the crankshaft journal is not good, the red lead can be unevenly and intermittently attached to the external circle surface of the journal;
3) placing the area detection plate in a shaft neck red lead attachment area, judging the size of the red lead attachment area according to the ratio of the number of grids of the red lead attachment area, uniformly and continuously attaching red leads to the excircle of the shaft neck, and judging that the product is qualified if the red lead attachment area is more than or equal to 70% in the whole effective detection width and length range; if the red lead is unevenly adhered to the outer circle of the shaft neck and presents an unattached area, and if the area of the unattached area is more than 30%, the area of the outer circle matching surface of the shaft neck is unqualified.
The detection area refers to an area where the red lead is attached to the circumference of the outer circle of the shaft neck when the detection tool is used for detection at each time, the width of the cuboid detection tool is matched with the width of the shaft neck, and the cuboid detection tool is fixed and unchangeable after being manufactured.
The effective detection width refers to that the area of red lead attached on the excircle circumference of the journal is larger than 20mm, the length refers to the axial width of the journal, the width is changed according to different journals to be detected, generally, the widths of all journal widths of the connecting rod journal are the same, and the widths of journal widths of the main journal are the same.
In order to improve the daily detection efficiency, the occupation ratio of the area of the shaft neck area with red lead can be judged by direct visual observation, and when the visual judgment cannot be carried out, the occupation ratio of the area without red lead is accurately judged by using the transparent grid area detection plate.
The utility model discloses detection device and detection method's theory of operation: simulating the relative motion of the crankshaft journal and the sliding bearing in a working state through a detection device, and performing relative motion on the excircle of the detected crankshaft journal by using a cuboid detection tool coated with red lead to ensure that the red lead is fully contacted with and tightly attached to the excircle of the journal; if the external circle matching degree of the crankshaft journal is not good, the red lead can be unevenly and intermittently attached to the external circle surface of the journal; whether the matching surface area of the cylindrical grinding surface of the tested crankshaft journal meets the requirement of being more than or equal to 70% can be judged visually and rapidly, and the purpose of online rapid quality monitoring is achieved.
Through the communication affirmation with the customer, both sides are approved the utility model discloses a detection device to and the detection method of the surface fitting surface area of the laminating situation of sliding bush when simulating crankshaft rotation through detection device.
Detecting an area with the width larger than 20mm at any position of the excircle of the whole journal, wherein the area of the matching surface reflects the formation condition of an oil film between the crankshaft and the bearing bush when the crankshaft works, the area of the matching surface is locally reduced, the parts can not form an effective oil film under the working condition of the crankshaft, the smaller the area of the effective bearing oil film is when the crankshaft works, and the larger the risk of abnormal wear failure of the bearing bush is; through the utility model discloses a fitting surface area detection device can discover this kind unqualifiedly, can improve through the grinding or the emery wheel parameter of truing of adjustment grinding usually.
The device of the utility model is simple in structure, adopted the fitting surface to scribble the principle that the look detected, satisfied the crank shaft journal excircle fitting surface area monitoring requirement that the customer proposed, problem that can in time discover the defect, this detection method easy operation, measurement of efficiency is high to online and quick detection purpose has been realized.
Drawings
FIG. 1 is a perspective view of the detecting device of the present invention;
FIG. 2 is a schematic structural view of the detecting device of the present invention;
FIG. 3 is a schematic view of the structure of the area detecting plate of the present invention;
FIG. 4 is a schematic diagram showing a qualified area of the outer circle matching surface of the crankshaft journal;
FIG. 5 is a schematic diagram showing the unqualified area of the surface area of the outer circle of the crankshaft journal.
In the figure: 1, a cuboid inspection tool 1-1 is provided with an upper chamfer 1-1, a lower chamfer 1-3, a front plane 1-4 and a back plane 1-5;
2, 2-1 anti-skid lines on the handle;
3 area detection board 3-1 grid 4 handle.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the embodiments, but is not limited to the technical solution of the present invention.
Example (b):
referring to fig. 1-3, the device for detecting the surface area of the excircle matching surface of the crankshaft journal comprises a cuboid detection tool 1, a handle 2 and a matched area detection plate 3;
the handle 3 and the cuboid gauge 1 are integrally formed or detachably connected, and the embodiment is integrally formed;
the width of the cuboid gauge 1 is matched with the width of the excircle matching surface of the crankshaft journal, the length is 80-100 mm, the thickness is 15-20 mm, the length of the cuboid gauge 1 is 100 mm, and the thickness is 16 mm;
the upper edge and the lower edge of the left side surface and the right side surface of the cuboid gauge 1 are respectively turned into an upper chamfer 1-1 and a lower chamfer 1-2 with the angles of 45 degrees, the chamfer distance is 7-8 mm, and the chamfer distance in the embodiment is 7 mm;
a positive plane 1-3 is formed between the upper chamfer 1-1 and the lower chamfer 1-2;
the flatness of two maximum planes, namely a front surface 1-4 and a back surface 1-5, of the cuboid gauge 1 for detection is less than or equal to 2 microns, and the roughness of the two maximum planes is less than Ra0.1;
the area detection plate 3 is a rectangular plate made of transparent materials, the thickness of the rectangular plate is 1-2 mm, the thickness of the rectangular plate is 2 mm, the width of the rectangular plate is matched with the width of an excircle matching surface of a crankshaft journal, the length of the rectangular plate is 45-50 mm, and the length of the rectangular plate is 50 mm;
the area detection plate 3 is engraved with square grids 3-1, and the area of each grid 3-1 is 1 square millimeter.
The outer surface of the handle 2 is provided with anti-skid grains 2-1.
During detection, the number of grids of the region where red lead is not attached to the outer circle surface of the crankshaft journal can be rapidly calculated through the area detection plate, the number of grids of the region where red lead is not attached is divided by the number of grids of the region where red lead is attached, and therefore the area proportion of the region where red lead is attached can be obtained, and the area of the surface matching surface of the outer circle surface of the crankshaft journal is obtained.
The cuboid gauge 1 needs to be matched with red lead for use, a layer of red lead with the thickness not more than 4 mu m needs to be uniformly coated on the surface of the cuboid gauge when the cuboid gauge is used, and a wet film thickness roller is adopted to detect whether the thickness of the red lead meets the requirement.
The detection method of the detection device for the area of the excircle matching surface of the crankshaft journal comprises the following steps:
1) uniformly coating a red lead layer on a detection plane of a cuboid detection tool of the detection device, wherein the thickness of the red lead layer is less than or equal to 4 mu m, and detecting whether the thickness of the red lead meets the requirement by adopting a wet film thickness roller;
2) cleaning a detected crankshaft journal, grasping a handle of a detection device, pressing a detection surface of a cuboid detection tool coated with red lead on the surface of the excircle of the detected crankshaft journal, pressing down and rotating in a small range, wherein the width of a detection area is more than 20mm, so that the cuboid detection tool and the journal move relatively, and the red lead is fully contacted with the excircle of the journal and is tightly attached to the excircle of the journal; if the external circle matching degree of the crankshaft journal is good, the red lead can be uniformly and continuously attached to the external circle surface of the journal; if the external circle matching degree of the crankshaft journal is not good, the red lead can be unevenly and intermittently attached to the external circle surface of the journal;
3) placing the area detection plate in a shaft neck red lead attachment area, judging the size of the red lead attachment area according to the ratio of the number of grids of the red lead attachment area, uniformly and continuously attaching red leads to the excircle of the shaft neck, and judging that the product is qualified if the red lead attachment area is more than or equal to 70% in the whole effective detection width and length range; if the red lead is unevenly adhered to the outer circle of the shaft neck and presents an unattached area, and if the area of the unattached area is more than 30%, the area of the outer circle matching surface of the shaft neck is unqualified.
In order to improve the daily detection efficiency, the area ratio of the area of the red lead adhering area of the excircle of the journal of the detected crankshaft can be directly judged by visual observation, and when the condition that whether the excircle of the journal of the detected crankshaft is qualified or not can not be judged by visual observation is met, the number of grids of the red lead adhering area is accurately judged by using an area detection plate.
Referring to fig. 4, a result schematic diagram of a qualified product of the rubbings of the red lead adhered to the excircle of the tested crankshaft journal is shown, the journal with qualified matching surface area is uniformly adhered to all parts of the excircle of the red lead, and 100% of detection areas are coated and adhered with the red lead.
Referring to fig. 5, the result of an unqualified product is schematically shown, wherein the red lead rubbings are attached to the excircle of the journal of the crankshaft to be tested, the unqualified journal exists in the area of the matching surface, about 50% of detection areas are not coated with the red lead, and the phenomenon is that the excircle of the journal is locally concave, and the red lead on the excircle of the concave part is not coated with a blank shape.
The detection device adopts a visual inspection mode for the red lead attachment part, and the detection device can not directly detect numerical values and directly judge the amplitude as a straightness detector, but can visually show the grinding quality of the shaft neck appearance and directly judge whether the area of the excircle matching surface of the crankshaft shaft neck meets the technological requirements of products.
Claims (3)
1. The utility model provides a bent axle journal outer circle fitting surface area detection device which characterized in that: the device comprises a handle, a cuboid gauge and an area detection plate which is matched with the cuboid gauge;
the handle and the cuboid gauge are integrally formed or detachably connected;
the width of the cuboid gauge is matched with the width of the excircle matching surface of the crankshaft journal, the length is 80-100 mm, and the thickness is 15-20 mm;
the upper edge and the lower edge of the left side surface and the right side surface of the cuboid gauge are respectively turned into an upper chamfer and a lower chamfer of 45 degrees, and the chamfer distance is 7-8 mm;
a positive plane is formed between the upper chamfer and the lower chamfer; the flatness of the front and back maximum planes of the cuboid detection tool for detection is less than or equal to 2 micrometers, and the roughness is less than Ra0.1;
the area detection plate is a rectangular plate made of transparent materials, the width of the area detection plate is matched with the width of the excircle matching surface of the crankshaft journal, and the length of the area detection plate is 45-50 mm;
square grids are carved on the area detection plate, and the area of each grid is 1 square millimeter.
2. The crankshaft journal outer circle matching surface area detecting device as claimed in claim 1, wherein: the outer surface of the handle is provided with anti-skid grains.
3. The crankshaft journal outer circle matching surface area detecting device as claimed in claim 1, wherein: the thickness of the area detection plate is 1-2 mm, and a handle integrally formed with the area detection plate is arranged on the area detection plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021420643.9U CN212512978U (en) | 2020-07-20 | 2020-07-20 | Device for detecting surface area of excircle matching surface of crankshaft journal |
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| CN202021420643.9U CN212512978U (en) | 2020-07-20 | 2020-07-20 | Device for detecting surface area of excircle matching surface of crankshaft journal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113028960A (en) * | 2021-03-17 | 2021-06-25 | 中国航发动力股份有限公司 | Method for measuring damage deformation of sealed labyrinth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113028960A (en) * | 2021-03-17 | 2021-06-25 | 中国航发动力股份有限公司 | Method for measuring damage deformation of sealed labyrinth |
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