CN110696918B - Preparation method of main beam for increasing overall NVH (noise, vibration and harshness) capability of vehicle - Google Patents
Preparation method of main beam for increasing overall NVH (noise, vibration and harshness) capability of vehicle Download PDFInfo
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- CN110696918B CN110696918B CN201910839237.1A CN201910839237A CN110696918B CN 110696918 B CN110696918 B CN 110696918B CN 201910839237 A CN201910839237 A CN 201910839237A CN 110696918 B CN110696918 B CN 110696918B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 138
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000010687 lubricating oil Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims description 65
- 238000011049 filling Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 20
- 238000001962 electrophoresis Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 238000000889 atomisation Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 28
- 238000003466 welding Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 8
- 238000005507 spraying Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention relates to the field of automobile and automobile part manufacturing, in particular to a preparation method of a main beam for increasing the overall NVH capacity of a vehicle. The maximum specific content of lubricating oil is at a minimum cost, and after heat treatment is used in the manufacturing process of the main beam, the inner wall of the main beam is enabled to form a special oil film layer to separate the front layer and the rear layer which are mutually attached to each other so as to basically eliminate abnormal sound caused by the main beam structure. The method comprises the following steps: step 1, manufacturing a corresponding main beam, wherein the main beam mainly corresponds to the structure in the technical range and comprises a front plate and a rear plate, and the lower plate is extruded to have the shape of V, C, U, arc, L, concave, L character and the like in the expansion section; and a contact distance structure that the distance between the folded top plate overlapping position of the front plate and the rear plate and the inner wall of the lower plate after the expansion manufacturing treatment is not equal to 0mm but less than 2 cm-0.2 mm in the whole top plate overlapping position or the distance of the most central part of the top plate overlapping position.
Description
Technical Field
The invention relates to the field of automobile and automobile part manufacturing, in particular to a preparation method of a main beam for increasing the overall NVH capacity of a vehicle.
Background
In the prior art, the main beam is often subjected to extrusion force generated by front and rear setbacks, torsional force of left and right forms or emergency steering, uneven ground or collision force in all directions caused by large pit-hole stone blocks and the like due to various forms of actions of the vehicle, and when the forces are transmitted to the main beam, the main beam is hollow and can generate sound of transmitted sound due to a hollow structure, component friction, wind sound generated by high-speed flowing wind, internal structure friction of the main beam and the like; for example, when the vehicle is connected with a longitudinal beam, various abnormal sounds are generated, such as an additional component, the abnormal sounds are a very core ring in the overall NVH capacity of the vehicle, and are important performances of vehicle purchase, delivery quality, comprehensive evaluation and the like, so that the chassis can generate various regular or irregular abnormal sounds in the running process of the vehicle, the problem of the abnormal sounds is low in frequency but the problem of customer complaints is urgent to be solved, the abnormal sounds all reveal that the design or correction of parts in a certain area of the vehicle are not too close, and because the abnormal sounds need to enter a 4S shop again for maintenance or preparation, a large number of vehicle replacement and overall large-scale recall events are seriously generated, the abnormal sounds are very serious matters for automobile manufacturers, and the enhancement of the overall NVH capacity of the vehicle is always the pursuing direction of the automobile manufacturing technology field.
Disclosure of Invention
The invention provides a preparation method of a girder for increasing the overall NVH capacity of a vehicle, which screens specific lubricating oil by formulating special oil parameters and process technology, aims at specifying the maximum specific content of the lubricating oil and has extremely low cost.
A preparation method of a girder for increasing the overall NVH capacity of a vehicle comprises the following steps:
Step 1, manufacturing a corresponding main beam, wherein the main beam mainly corresponds to the structure in the technical range and comprises a front plate, a rear plate and a lower plate, wherein the front plate, the rear plate and the lower plate are folded and punched by a single metal plate body and then welded end to end, or the whole pipe body is extruded, folded and punched to manufacture a triangular cross section structure, and the lower plate is extruded and expanded to form a V-shaped cross section, a C-shaped cross section, a U-shaped cross section, an arc cross section, an L-shaped cross section, a concave cross section or a L-shaped cross section; the pipe body is adopted to directly carry out expansion treatment, in the treatment process, a top plate overlapping position (7) formed by folding a front plate (4) and a rear plate (5) and a lower plate (6) formed by expansion production treatment are ensured, and the distance between the inner walls of the front plate and the rear plate is only at the most central part of the whole top plate overlapping position (7) or the top plate overlapping position (7) and is not equal to 0mm but less than 2cm;
step 2, punching holes on the main beam manufactured in the manufactured step 1 to manufacture oil holes (3);
step 3, blending lubricating oil, wherein the flash point of the prepared lubricating oil is less than or equal to 170 ℃ to obtain noise reduction oil;
Step 4, assembling the main cross beam with the left longitudinal beam and the right longitudinal beam matched with the main cross beam, or additionally installing the main cross beam with other components to form a complete automobile beam body assembly; step 5, injecting the noise reduction oil obtained in the step 3 into the main beam through the oil injection hole manufactured in the step 2;
Step 6, plugging the oil filling hole (3) after the noise reduction oil is filled into the main beam, wherein the tightness of the main beam is 100%;
step 7, the whole automobile beam body assembly assembled in the step is subjected to a surface electrophoresis line procedure, and then is put into an electrophoresis drying channel for baking treatment, and noise reduction oil with the flash point less than or equal to 170 ℃ is atomized by utilizing the temperature of the drying channel;
Step 8, controlling the noise reduction oil in the main beam of the automobile beam body assembly to be completely atomized, and taking out the automobile beam body assembly from the electrophoresis drying channel after the atomization processing temperature and the processing time are reached;
step 9, placing and cooling the automobile beam body assembly after the automobile beam body assembly is discharged from the drying tunnel, condensing and cooling noise reduction oil in the main beam of the automobile beam body assembly again to form a noise reduction oil film layer on the inner wall of the main beam, wherein the thicker the noise reduction oil film is in an interval with small gaps formed by tension of the noise reduction oil on the inner wall of the main beam in the condensation process, the more completely the purpose of meeting the requirement is achieved;
And 10, detecting the integrity, the assembly quality and the elements of the whole assembled automobile beam body assembly.
Preferably, in the heat treatment process of the electrophoresis drying channel in the step 7, the treatment temperature of the heat treatment is gradually raised to 200 ℃ and the stable treatment is maintained for more than 30 minutes.
Preferably, when the oil filling hole (3) is perforated in the step 2, 1 left oil filling hole and 1 right oil filling hole are respectively arranged on the main beam close to the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, in the step 2, 10ml of noise reducing oil is injected into each of the left oil injection hole and the right oil injection hole in the step 5, and 20ml of noise reducing oil is injected into the main beam in total.
Preferably, the opening angle of the V-shaped main beam in the step 1 is 120 degrees.
Preferably, the heat treatment and the cooling condensation process of the electrophoresis drying tunnel are performed under the condition that the V-shaped main beam processed in the steps 10, 11 and the process is in an upright or inverted state.
A car main beam obtained according to a preparation method of a car integral NVH capacity main beam is characterized in that: a main beam for increasing the overall NVH capacity of a vehicle comprises a main beam (1), a left longitudinal beam (2) and a right longitudinal beam (3), wherein the left side of the main beam (1) is spliced with the left longitudinal beam (2), and the right side of the main beam is spliced with the right longitudinal beam (3); the main beam (1) is formed by directly performing expansion treatment by adopting a pipe body, comprises a front plate (4), a rear plate (5) and a lower plate (6), wherein the tops of the front plate (4) and the rear plate (5) are connected into a folded angle top (14), then the two are arranged in an inverted V-shaped structure, the bottoms of the two are transversely connected with the lower plate (6), the lower plate is formed by extruding and expanding the bulge upwards from the bottom at the central axis position to form a trapezoid or arc-shaped or' [ character ] shaped structure with the X-axis direction cross section of which the two sides are downward arc tops being transversely straight, 3 parts are formed, the trapezoid or arc-shaped structure comprises a central top plate overlapped part (7) and a guide horn plate part (8) extending downwards at the front end and the rear end of the top plate overlapped part (7), the Y-axis direction shape is a V-shaped shape or U-shaped shape, the arc angle of the top plate overlapped part (7) is at least 120 DEG, the angle of the connecting position of the Y-axis direction lower plate and the front plate (4) and the rear plate (5) is respectively folded by at least 300 DEG, the front plate (4), the rear plate (5) and the lower plate (5) are provided with an oil film layer at the inner wall (9) with a high-thickness and a high-reduced layer, and an oil film layer is formed at the inner wall layer; the tops of the front plate (4) and the rear plate (5) are connected into a folded angle top (14) and are overlapped with the lower plate (6) below, and the distance between the two is not equal to 0 but less than 0.2cm.
Preferably, the opening angle of the V-shaped automobile main beam is 120 degrees.
The inclined oil inlet grooves are preferably formed in the positions of the oil filling holes of the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, the front plate (4) and the rear plate (5) are also outwards formed with a flaring structure above the matched guide horn plate part (8) to be provided with a conical transverse plate (15), and the head end of the conical transverse plate (15) is provided with a longitudinal beam top welding biting piece (16). This snap-in construction allows for better connection of the cross members to the longitudinal members and increases the transmission of stresses.
The left longitudinal beam (2) and the right longitudinal beam (3) are preferably of an expansion type pipe longitudinal beam structure with the same structure, and the whole structure is J-shaped. Is suitable for light vehicles.
And preferably, a folding angle connecting point (12) is arranged below the front beam bending parts of the left longitudinal beam (2) and the right longitudinal beam (3), and the head end and the tail end of the main beam are welded in a splicing way through the folding angle connecting points (13) of the left longitudinal beam (2) and the right longitudinal beam (3).
The left longitudinal beam (2) and the right longitudinal beam (3) are preferably provided with oblique oil inlet grooves (17) at the positions of oil filling holes. The structure mainly forms a groove, so that the oil spraying mechanical arm can deflect inwards when spraying, and can detect whether the oil spraying mechanical arm is accurately injected to a spraying position or not when the oil spraying mechanical arm is required.
As preferable, the main cross beam (1) is provided with a spring disc (18) at an inner corner (15) formed by assembling the left longitudinal beam (2) and the right longitudinal beam (3), a sealing baffle (19) is arranged on a disc fin of the spring disc in a forward extending mode, and the extending position of the sealing baffle (19) is matched with the oil filling hole arrangement position. After the spring disc (18) is installed on the main beam (1) and is assembled with the auxiliary components of the left longitudinal beam (2) and the right longitudinal beam (3), two choices of oil injection holes are directly opened, one choice is welding and sealing by a welding gun, the welding and sealing are not good for the quality of the main beam after all, namely, the spring disc (18) which is further designed with a sealing baffle (19) after the welding and sealing is further shown in fig. 10 can completely attach to the outer wall bottoms of the main beam and the longitudinal beam from the bottom to completely seal the whole oil injection hole again, and the final 1-point quality hidden trouble is eliminated.
Preferably, the pilot horn plate (8) is expanded outwards by at least 5 degrees. At least the front plate (4) and the rear plate (5) of the guiding horn plate part (8) can be outwards expanded and pressed to form a horn mouth structure which is outwards expanded by 5 degrees, and the lower plate can keep the original shape because of being expanded.
Compared with the prior art, the invention has the following beneficial effects: 1. the process method greatly reduces the traditional oiling and film producing technology with complex process, high operation difficulty and very low success rate in the prior art through a process method which is easy to operate and realize, eliminates the situations that the noise reduction oil film layer is unevenly distributed in the prior art although the noise reduction oil film layer is generated, and the gaps are not provided with more distribution points of the noise reduction oil film layer, or the heat treatment requirement is high, so that the injected noise reduction oil can appear;
2. The method comprises the steps of obtaining noise reduction oil with a flash point to be 170 ℃ to 100 ℃ at the upper limit by controlling and blending lubricating oil, injecting the noise reduction oil into a V-shaped or C-shaped or U-shaped or arc-shaped or L-shaped or concave-shaped or L-shaped main beam by a sealing method, forming a noise reduction oil film layer by an independently developed heat treatment process, and enabling the thickness of the noise reduction oil film layer formed each time to be consistent and stable;
3. The formed noise reduction oil film layer is stable in distribution, and the defect condition that the key position points have no incomplete noise reduction oil film layer distribution points appears.
4. The noise reduction oil in an atomization state can be automatically relied on, and a noise reduction oil film layer is automatically formed at a structural position of which the distance between the front side panel and the rear side panel is close to 0cm instead of complex manual treatment;
5. The complete noise reduction oil film layer isolates the structural positions of the front side panel and the rear side panel which are contacted front and back at a distance of approximately 0cm, so that the differential loudness of the positions is approximately 0 dB, and the friction sound formed by the inner wall of the main beam is completely solved;
6. The cost is extremely low, the manufacturing processing speed is high, the abnormal sound of the main beam is greatly reduced, the NVH capacity of the whole automobile is greatly improved, the noise reduction technology of the automobile is improved to a new step by the improvement of the capacity, and the method also brings higher social benefits, such as the large-scale recall event brought by the abnormal sound, the possible loss caused by automobile manufacturers is greatly avoided, and the market competitiveness of our factories is greatly improved.
Drawings
FIG. 1 is an overall top view;
FIG. 2 is a side perspective view of the main beam;
FIG. 3 is a front cross-sectional view of a main cross member and a longitudinal member connection;
FIG. 4 is a cross-sectional view of the head and tail ends of the A-A main beam;
FIG. 5 is an enlarged view of the noise reduction oil film layer structure;
FIG. 6 is a block diagram of the leading horn plate at the head end of the main beam B-B and the stringer connection;
FIG. 7 is a cross-sectional view of the main and side rails C-C;
FIG. 8 is a view of a main cross member and a side member and their components;
FIG. 9 is a view showing the spray state of the oil filling holes;
FIG. 10 is a diagram of spring holder embodiment 2;
in the figure: main crossbeam (1), left longeron (2), right longeron (3), preceding board (4), rear panel (5), below board (6), roof coincide department (7), guide loudspeaker board portion (8), noise reduction oil film layer (9), oil filler point (10), lead oil and lift slope (11), dog-ear tie point (12), dog-ear top (13), slant advance oil groove (14), interior angle portion (15), spring holder (16), sealed separation blade (17), toper diaphragm (18), longeron top welding bite piece (19).
Detailed Description
The following description is made of the technical scheme of the present invention by way of preferred embodiments with reference to the accompanying drawings:
Main embodiment
A preparation method of a girder for increasing the overall NVH capacity of a vehicle comprises the following steps:
Step 1, manufacturing a corresponding main beam, wherein the main beam mainly corresponds to the structure in the technical range and comprises a front plate, a rear plate and a lower plate, wherein the front plate, the rear plate and the lower plate are folded and punched by a single metal plate body and then welded end to end, or the whole pipe body is extruded, folded and punched to manufacture a triangular cross section structure, and the lower plate is extruded and expanded to form a V-shaped cross section, a C-shaped cross section, a U-shaped cross section, an arc cross section, an L-shaped cross section, a concave cross section or a L-shaped cross section; the pipe body is adopted to directly carry out expansion treatment, in the treatment process, a top plate overlapping position (7) formed by folding a front plate (4) and a rear plate (5) and a lower plate (6) formed by expansion production treatment are ensured, and the distance between the inner walls of the front plate and the rear plate is only at the most central part of the whole top plate overlapping position (7) or the top plate overlapping position (7) and is not equal to 0mm but less than 2cm;
step 2, punching holes on the main beam manufactured in the manufactured step 1 to manufacture oil holes (3);
step 3, blending lubricating oil, wherein the flash point of the prepared lubricating oil is less than or equal to 170 ℃ to obtain noise reduction oil;
Step 4, assembling the main cross beam with the left longitudinal beam and the right longitudinal beam matched with the main cross beam, or additionally installing the main cross beam with other components to form a complete automobile beam body assembly; step 5, injecting the noise reduction oil obtained in the step 3 into the main beam through the oil injection hole manufactured in the step 2;
Step 6, plugging the oil filling hole (3) after the noise reduction oil is filled into the main beam, wherein the tightness of the main beam is 100%;
step 7, the whole automobile beam body assembly assembled in the step is subjected to a surface electrophoresis line procedure, and then is put into an electrophoresis drying channel for baking treatment, and noise reduction oil with the flash point less than or equal to 170 ℃ is atomized by utilizing the temperature of the drying channel;
Step 8, controlling the noise reduction oil in the main beam of the automobile beam body assembly to be completely atomized, and taking out the automobile beam body assembly from the electrophoresis drying channel after the atomization processing temperature and the processing time are reached;
step 9, placing and cooling the automobile beam body assembly after the automobile beam body assembly is discharged from the drying tunnel, condensing and cooling noise reduction oil in the main beam of the automobile beam body assembly again to form a noise reduction oil film layer on the inner wall of the main beam, wherein the thicker the noise reduction oil film is in an interval with small gaps formed by tension of the noise reduction oil on the inner wall of the main beam in the condensation process, the more completely the purpose of meeting the requirement is achieved;
And 10, detecting the integrity, the assembly quality and the elements of the whole assembled automobile beam body assembly.
Preferably, in the heat treatment process of the electrophoresis drying channel in the step 7, the treatment temperature of the heat treatment is gradually raised to 200 ℃ and the stable treatment is maintained for more than 30 minutes.
Preferably, when the oil filling hole (3) is perforated in the step 2, 1 left oil filling hole and 1 right oil filling hole are respectively arranged on the main beam close to the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, in the step 2, 10ml of noise reducing oil is injected into each of the left oil injection hole and the right oil injection hole in the step 5, and 20ml of noise reducing oil is injected into the main beam in total.
Preferably, the opening angle of the V-shaped main beam in the step 1 is 120 degrees.
Preferably, the heat treatment and the cooling condensation process of the electrophoresis drying tunnel are performed under the condition that the V-shaped main beam processed in the steps 10, 11 and the process is in an upright or inverted state.
As shown in FIG. 1, the structure of the present invention is mainly developed in the expansion beam technology, embodiment 1
As shown in FIG. 1, the structure of the invention is mainly developed in the technology of an expanding beam, and the girder for increasing the overall NVH capacity of a vehicle comprises a main girder (1), a left girder (2) and a right girder (3), wherein the left side of the main girder (1) is spliced with the left girder (2), and the right side of the main girder is spliced with the right girder (3);
Wherein the following are: as shown in fig. 1 and 2, the main beam (1) is formed by integrally stamping or water expansion molding a metal plate body or a metal pipe, and the whole metal pipe with high manufacturing speed is selected to be expanded into a triangle, so that a front plate (4) inclined 45 degrees backwards at the left side as shown in fig. 2 is formed, the top of the front plate (4) is connected with the top of a rear plate (5), the rear plate (5) inclined 45 degrees forwards is arranged after the front plate (4) is bent backwards at the top, the front plate (4) and the rear plate (5) are extruded into an inverted V-shaped structure, and then a lower plate (6) arranged at the bottom of the front plate (4) and the rear plate is connected with the straight bottom position, so that the round pipe is extruded into a triangle pipe with the whole cross section of 1 positive angle;
Then continuing to perform expansion processing, as shown in fig. 2, extruding the lower plate upwards by water expansion from the central transverse axis position of the bottom at the outer side position of the outer wall, and carrying out central extrusion with the highest stress, so that a lower plate (6) transversely connected with the bottoms of the front plate and the rear plate is formed by extruding and expanding the lower plate upwards from the bottom at the central axis position of the Y-axis surface to form a trapezoid or arc-shaped structure with the Y-axis direction cross section of which the two sides are downward arc lines and the top is transversely straight or a "[ character ] -shaped structure, and forming 3 parts, wherein the trapezoid or arc-shaped structure comprises a central roof overlapping part (7) and guide horn plate parts (8) extending downwards at the head end and the tail end of the roof overlapping part (7);
The cross section of the lower plate (6) in the Y-axis direction is V-shaped as shown in figures 3 and 4, the arc angle of the folded angle top (13) is at least 120 degrees, and the folding angle of the connecting and folding positions of the lower plate in the X-axis direction and the front plate (4) and the rear plate (5) is at least 300 degrees; the convex part of the plate body of the lower plate (6) at the top can be infinitely close to the structure of the folded corner top (13) from the bottom, and the cavity structure in a round shape or a water drop shape can be formed after the lower plate (6) at the bottom and the front plate (4) or the rear plate (5) are extruded and folded;
the arrangement is that the main beam can reach a nearly complete double-layer structure, and the bottom of the main beam has larger stress modes when the front side and the rear side of the main beam are stressed, so that the thickness of the distance between the two sides is increased, as shown in fig. 2, if the stress is from the right side, the stress surface is at least 150 degrees, and if the stress is set to 120 degrees at the folded angle top (13), the stress is estimated to be only 60-40 degrees, which is not beneficial to the stress conduction and the impact handling of the main beam (1);
Finally, in order to lead in the relevant arrangement structure of noise reduction oil in the main beam (1), the X-axis central axis position of the lower plate (6) of the guiding horn plate part (8) of the main beam (1) is provided with oil injection holes (10), namely, the two ends of the head and the tail of the main beam are provided with oil guiding lifting slopes (11) taking the oil injection holes (10) as head ends and facing the inside of the tube body in a shaping way, the oil guiding lifting slopes (11) are extruded and expanded on the lower plate (6) of the bottom part of the guiding horn plate part (8) to form a circular arch body shaping structure, the front gradient of extrusion and expansion are mainly carried out from the front to the back, the opening is large, the rear gradient of extrusion and expansion is small, thus, a bucket opening structure for guiding oil mist is formed, and the transmission of the oil mist to the center is enhanced;
In the prior art, a double-sandwich structure with a gap less than 2cm is formed between a folded angle top (13) and a rear Fang Banxing of a central folded rear bulge, when a main beam twists left and right and impacts front and back, the sandwich or double-sandwich structure can generate friction generated by two plate bodies, if the friction is eliminated, the sandwich structure is not needed or the gap is required to be improved, so that the stress differentiation capability of the main beam is reduced, the technology can set a layer of noise reduction oil film layer (9) on the inner walls of the front plate (4), the rear plate (5) and the lower plate (6) in a solidification mode, the folded angle top (13) connected with the top of the front plate (4) and the top plate superposed with the bottom plate superposed with the top plate (7) is not equal to 0 but less than 0.2cm, and the distance between the folded angle top (13) and the top plate superposed with the top plate is generally 0.2mm; the thickness of the noise reduction oil film layer (9) at the inner wall of the top plate overlapping part (7) is high, the thickness of the inner wall of the guide horn plate part (8) is low, and the formation method of the noise reduction oil film layer is as follows:
Step 1, preparing lubricating oil, wherein the lubricating oil is QUIETSCH-EX series, PAO synthetic oil, antirust agent, antioxidant and penetrating agent are added, the lubricating oil can be freely matched with the prior art oil according to specific vehicle types, and the flash point of the lubricating oil after the preparation is controlled between 170 ℃ and 120 ℃ to obtain noise reduction oil formed by a noise reduction oil film layer;
Step 2, additionally installing and welding a left longitudinal beam (2) and a right longitudinal beam (3) matched with a main cross beam (1) of the automobile to finish sealing of the head end side surface and the tail end side surface, namely the position of a guide horn plate part (8) of the main beam;
Step 3, injecting the noise reduction oil obtained in the step 2 into the main beam (1) through main oil injection holes, wherein 10ml of the noise reduction oil is respectively injected into two oil injection holes on the left side and the right side of the main beam (1), two modes are injected, and the noise reduction oil is directly instilled in the prior art in each market, and then the improvement technology is adopted: 20ml of noise reduction oil is injected into the main beam (1) in total; the situation shown in fig. 8 is noted when the oil is injected, the oil gun of the oil injection mechanical arm is an elbow gun, the oil gun is atomized and sprayed when the oil is injected, the dispersion can be relatively uniform, the dispersion area is also wide, the initially-installed beam body obtained in the step 2 is also downward in the head, the spray scattering can be noted when the oil is atomized and sprayed, and the oil can be directly sprayed into a line of the whole bevel top (13) under the guidance of the oil guiding lifting slope (11).
Step 4, welding and plugging the oil filling hole (3) after the noise reduction oil is filled into the main beam (1) so that the tightness of the front side panel (1) and the rear side panel (2) is 100%; installing spring disc bracket and other bushings;
and 5, placing the secondarily assembled vehicle beam into an electrophoresis drying tunnel for baking treatment after the surface electrophoresis line procedure. Atomizing noise reduction oil by utilizing the temperature of the electrophoresis drying tunnel;
Step 6, after the lubricating oil in the main beam is controlled to be atomized, taking out the beam for cooling, wherein the tension of the noise reduction oil in the cooling and condensing process forms a thicker noise reduction oil film layer in the inner wall of the main beam if an interval structure with a small gap is formed, namely, the thickest noise reduction oil film layer is formed in an interlayer gap of not more than 0.2cm at the folded angle top (13), and the noise reduction oil film layer is thinner towards the leading horn plate (8), so that the purpose of using requirements is completely achieved; the advantage that can form this time is that the oil that uses in the middle is much, can eliminate the friction sound of double-deck, and other partial noise reduction oil film layers are less but cover the rough problem of metal surface that the inner wall probably exists in can restricting the transmission of sound scattering in the inner chamber, noise reduction oil film layer also is soft material, has buffer capacity so also can absorb a part of noise.
The left longitudinal beam (2) and the right longitudinal beam (3) are preferably of an expansion type pipe longitudinal beam structure with the same structure, and the whole structure is J-shaped. Is suitable for light vehicles.
And preferably, a folding angle connecting point (12) is arranged below the front beam bending parts of the left longitudinal beam (2) and the right longitudinal beam (3), and the head end and the tail end of the main beam are welded by splicing the folding angle connecting points (12) of the left longitudinal beam (2) and the right longitudinal beam (3).
The left longitudinal beam (2) and the right longitudinal beam (3) are preferably provided with oblique oil inlet grooves (14) at the positions of oil filling holes. The oblique oil inlet groove (14) is provided with two functions, namely the position of a longitudinal beam connecting clamping piece for connecting the top and the position of a longitudinal beam connecting clamping piece for connecting the bottom can be achieved when oiling, so that part of top atomized liquid can be shunted to sink into the bottom when condensing, and the groove can also enable the spraying mechanical arm to spray, and the inner position can be detected and known for positioning.
As preferable, the main cross beam (1) is provided with a spring disc (16) at an inner corner (15) formed by assembling the left longitudinal beam (2) and the right longitudinal beam (3), a sealing baffle (17) is arranged on a disc fin of the spring disc in a forward extending mode, and the extending position of the sealing baffle (17) is matched with the oil filling hole arrangement position. After the spring disc (16) is installed on the main beam (1) and is assembled with the auxiliary components of the left longitudinal beam (2) and the right longitudinal beam (3), two choices of oil injection holes are directly opened, one choice is welding and sealing by a welding gun, the welding and sealing are not good for the quality of the main beam after all, namely, the spring disc (16) which is further designed with a sealing baffle (17) after the welding and sealing is further shown in fig. 10 can completely attach to the outer wall bottoms of the main beam and the longitudinal beam from the bottom to completely seal the whole oil injection hole again, and the final 1-point quality hidden trouble is eliminated.
Preferably, the pilot horn plate (8) is expanded outwards by at least 5 degrees. At least the front plate (4) and the rear plate (5) of the guiding horn plate part (8) can be outwards expanded and pressed to form a horn mouth structure which is outwards expanded by 5 degrees, and the lower plate can keep the original shape because of being expanded.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. A preparation method of a girder for increasing the overall NVH capacity of a vehicle comprises the following steps:
Step 1, manufacturing a corresponding main beam, wherein the main beam mainly corresponds to the structure in the technical range and comprises a front plate, a rear plate and a lower plate, wherein the front plate, the rear plate and the lower plate are folded and punched by a single metal plate body and then welded end to end, or the whole pipe body is extruded, folded and punched to manufacture a triangular cross section structure, and the lower plate is extruded and expanded to form a V-shaped cross section, a C-shaped cross section, a U-shaped cross section, an arc cross section, an L-shaped cross section, a concave cross section or a L-shaped cross section; the pipe body is adopted to directly carry out expansion treatment, in the treatment process, a top plate overlapping position (7) formed by folding a front plate (4) and a rear plate (5) and a lower plate (6) formed by expansion production treatment are ensured, and the distance between the inner walls of the front plate and the rear plate is only at the most central part of the whole top plate overlapping position (7) or the top plate overlapping position (7) and is not equal to 0mm but less than 2cm;
step 2, punching holes on the manufactured main beam manufactured in the step 1 to manufacture oil holes;
step 3, blending lubricating oil, wherein the flash point of the prepared lubricating oil is less than or equal to 170 ℃ to obtain noise reduction oil;
step 4, assembling the main cross beam with the left longitudinal beam and the right longitudinal beam matched with the main cross beam, or additionally installing the main cross beam with other components to form a complete automobile beam body assembly;
step 5, injecting the noise reduction oil obtained in the step 3 into the main beam through the oil injection hole manufactured in the step 2;
Step 6, plugging the oil filling hole after the noise reduction oil is filled into the main beam, wherein the tightness of the main beam is 100%;
step 7, the whole automobile beam body assembly assembled in the step is subjected to a surface electrophoresis line procedure, and then is put into an electrophoresis drying channel for baking treatment, and noise reduction oil with the flash point less than or equal to 170 ℃ is atomized by utilizing the temperature of the drying channel;
Step 8, controlling the noise reduction oil in the main beam of the automobile beam body assembly to be completely atomized, and taking out the automobile beam body assembly from the electrophoresis drying channel after the atomization processing temperature and the processing time are reached;
step 9, placing and cooling the automobile beam body assembly after the automobile beam body assembly is discharged from the drying tunnel, condensing and cooling noise reduction oil in the main beam of the automobile beam body assembly again to form a noise reduction oil film layer on the inner wall of the main beam, wherein the thicker the noise reduction oil film is in an interval with small gaps formed by tension of the noise reduction oil on the inner wall of the main beam in the condensation process, the more completely the purpose of meeting the requirement is achieved;
And 10, detecting the integrity, the assembly quality and the elements of the whole assembled automobile beam body assembly.
2. The method for preparing the main beam for increasing the overall NVH capacity of the vehicle according to claim 1, wherein the main beam is characterized by comprising the following steps of: in the heat treatment process of the electrophoresis drying tunnel in the step 7, the treatment temperature of the heat treatment is required to be gradually increased to 200 ℃, and the stable treatment is kept for more than 30 minutes.
3. The method for preparing the main beam for increasing the overall NVH capacity of the vehicle according to claim 1, wherein the main beam is characterized by comprising the following steps of: and (2) when the oil filling holes are drilled in the step (2), 1 oil filling holes are respectively formed in the main beam, which are close to the left longitudinal beam and the right longitudinal beam, and the left oil filling holes and the right oil filling holes are respectively formed in the main beam.
4. A method for preparing a girder for increasing the overall NVH capacity of a vehicle according to claim 1 or 3, characterized in that: the left oil filling hole and the right oil filling hole in the step 2 are respectively filled with 10ml of noise reduction oil in the step 5, and 20ml of noise reduction oil is filled in the main beam in total.
5. The method for preparing the main beam for increasing the overall NVH capacity of the vehicle according to claim 1, wherein the main beam is characterized by comprising the following steps of: and (5) performing heat treatment and cooling condensation processes of the electrophoresis drying tunnel under the condition that the V-shaped main beam processed in the step (10) and the step (11) is in an upright or inverted state.
6. A vehicle main beam obtained by the method for manufacturing a vehicle integral NVH capacity main beam according to claim 1, characterized in that: a main beam for increasing the overall NVH capacity of a vehicle comprises a main beam, a left longitudinal beam and a right longitudinal beam, wherein the left side of the main beam is spliced with the left longitudinal beam, and the right side of the main beam is spliced with the right longitudinal beam; the main beam is formed by directly carrying out expansion treatment by adopting a pipe body, and comprises a front plate, a rear plate and a lower plate, wherein the tops of the front plate and the rear plate are connected to form a folded angle top, then the two plates are arranged in an inverted V-shaped structure, the bottoms of the two plates are transversely connected with the lower plate, the lower plate is extruded and expanded upwards from the bottom to form a trapezoid or arc or a 'character' shaped structure with the X-axis direction cross section of which the two sides are downward arc tops and the transverse straight, the lower plate forms 3 parts, the lower plate comprises a central top plate overlapping part and a guide horn plate part which extends downwards at the head end and the tail end of the top plate overlapping part, the Y-axis direction shape is a V-shaped or U-shaped shape, the arc angle of the top plate overlapping part is at least 120 DEG, the folding angle of the connecting position of the Y-axis direction lower plate and the front plate and the rear plate is at least 300 DEG, and the inner wall solidification shaping of the front plate, the rear plate and the lower plate are provided with a noise reduction film layer, the thickness of the noise reduction film layer at the inner wall of the top plate is high at the overlapping part of the top plate, and the inner wall thickness of the guide horn plate part is low; the tops of the front plate and the rear plate are connected into a folded angle top, and the folded angle top and the lower plate below are overlapped, wherein the distance between the folded angle top and the lower plate is not equal to 0cm but less than 0.2cm.
7. The main beam of claim 6, wherein: and oblique oil inlet grooves are formed in the positions of the oil filling holes of the left longitudinal beam and the right longitudinal beam.
8. The main beam of claim 6, wherein: the main beam is provided with a spring disc at the inner angle formed by assembling the main beam with the left longitudinal beam and the right longitudinal beam, a disc fin of the spring disc extends forwards and is provided with a sealing baffle, and the extending position of the sealing baffle is matched with the setting position of the oil filling hole.
9. The main beam of claim 6, wherein: the pilot horn plate portion expands outwardly at least 5 °.
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| CN112659842A (en) * | 2020-12-30 | 2021-04-16 | 安徽大昌科技股份有限公司 | Anticorrosion and lubrication process for closed torsion beam inner cavity |
| CN112945577A (en) * | 2021-03-04 | 2021-06-11 | 拾音汽车科技（上海）有限公司 | Method for solving batch metal plate abnormal sound of AB columns of passenger vehicle body |
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