CN110696918A - Preparation method of main beam capable of increasing overall NVH (noise, vibration and harshness) capacity of vehicle - Google Patents
Preparation method of main beam capable of increasing overall NVH (noise, vibration and harshness) capacity of vehicle Download PDFInfo
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- CN110696918A CN110696918A CN201910839237.1A CN201910839237A CN110696918A CN 110696918 A CN110696918 A CN 110696918A CN 201910839237 A CN201910839237 A CN 201910839237A CN 110696918 A CN110696918 A CN 110696918A
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- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000010687 lubricating oil Substances 0.000 claims description 13
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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
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Abstract
The invention relates to the field of automobile and automobile part manufacturing, in particular to a method for manufacturing a main beam capable of increasing the NVH capacity of the whole automobile, which comprises the following steps of 1, manufacturing a corresponding main beam, wherein the main beam mainly corresponds to the structure of the technical range and comprises a front plate and a rear plate, the lower plate is extruded and expanded to form V-shaped, C-shaped, U-shaped, arc-shaped, L-shaped, concave and L-shaped cross sections, and the distance between the folded top plate overlapping part of the front plate and the rear plate and the inner wall of the expanded lower plate is in the whole top plate overlapping part or a ~ 0.2-2 mm contact distance structure, wherein the distance between the central part of the folded top plate of the front plate and the rear plate is not equal to 0mm but less than 2cm 26 0.2 mm.
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 integral NVH (noise, vibration and harshness) capacity of a vehicle.
Background
In the prior art, the main beam is always subjected to extrusion force generated by front and rear humps, torsion force in left and right modes or emergency steering, uneven ground or collision force in all directions caused by large pothole stones and the like due to various types of actions of a vehicle, and when the forces are transmitted to the main beam, the main beam is a hollow main beam, and sound transmitted into the main beam is generated due to a hollow structure of the main beam, part friction, wind sound generated by high-speed flowing wind or internal structure friction of the main beam; these reasons directly result in that, for example, the connection to the longitudinal beams, such as additional components, can generate various abnormal sounds, the abnormal sounds are a very central part in the overall NVH capability of the vehicle, and are important expressions of vehicle purchase, factory quality, comprehensive evaluation and the like, so that common vehicle users can often generate various regular or irregular abnormal sounds on a chassis during vehicle running, the abnormal sounds are low in frequency but strong in customer complaints, the problems need to be solved, the abnormal sounds all reveal that the part design or the adjustment and the like of a certain area of the vehicle are not passed through, and because the abnormal sounds need to enter a 4S store for overhauling or maintenance, a large number of events needing vehicle replacement and large-scale recall are seriously generated, these are very serious issues for automobile manufacturers, and enhancing the overall NVH capability of the vehicle is always the pursuit direction in the technical field of automobile manufacture.
Disclosure of Invention
The invention provides a preparation method of a main beam for increasing the overall NVH capacity of a vehicle, which screens specific lubricating oil by formulating special oil parameters and process technology, specifies the maximum specific content of the lubricating oil and has extremely low cost.
A preparation method of a main beam for increasing the integral NVH capacity of a vehicle comprises the following steps:
the method comprises the following steps that 1, a corresponding main beam (1) is manufactured, the main beam mainly corresponds to a structure in a technical range and comprises a front plate (4), a rear plate (5) and a lower plate (6), the front plate and the rear plate are folded and punched by a single metal plate body and then welded end to end or a pipe body is integrally extruded, folded, punched and the like to manufacture a cross section triangular structure, the lower plate (6) is extruded and expanded to be in a V shape, a C shape, a U shape, an arc shape, an L shape, a concave character, a L character and the like, the manufacturing mode of the latter is generally selected, the pipe body is directly expanded, and in the reprocessing process, the contact distance structure is ensured, wherein the distance between the folding position (7) of a top plate folded by the front plate (4) and the rear plate (5) and the inner wall of the lower plate (6) after expansion manufacturing processing is not equal to 0mm but smaller than 2cm ~ 0.2.2 mm at the central position of the whole top plate folding position (7);
6, plugging the oil injection hole (3) after the noise-reducing oil is injected into the main cross beam, wherein the sealing degree of the main cross beam is 100%;
step 9, controlling the noise reduction oil in the automobile beam body assembly to be completely atomized, taking out the automobile beam body assembly from the electrophoresis drying tunnel after the atomization processing temperature and the processing time are reached, placing and cooling the automobile beam body assembly to enable the noise reduction oil to be condensed again, wherein the thicker the oil film in the interval with the small gap formed by the tension of the noise reduction oil in the condensation process is, and the purpose of use is completely achieved;
and step 110, cooling the workpiece after the workpiece is taken out of the drying channel to form a noise-reducing oil film.
And 11, 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 tunnel in the step 7, the treatment temperature of the heat treatment is gradually increased to 200 ℃, and the heat treatment is kept for more than 30 minutes.
Preferably, when the oil holes (3) are punched in the step 2, 1 oil hole is respectively arranged on the main cross beam close to the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, the left oil filler and the right oil filler of the step 2 are respectively injected with 10ml of noise reduction oil at the time of the step 5, and 20ml of noise reduction oil is injected into the main beam in total.
Preferably, the V-shaped main beam opening angle of the step 1 is 120 °.
Preferably, the heat treatment and cooling and condensing processes of the electrophoresis drying tunnel are performed in the upright or inverted state of the V-shaped main beam processed in the steps 10 and 11.
The utility model provides a car owner's roof beam that obtains according to the preparation method of the whole NVH ability girder of vehicle, characterized by: a main beam for increasing the overall NVH capacity of a vehicle comprises a main cross beam (1), a left longitudinal beam (2) and a right longitudinal beam (3), wherein the left side of the main cross beam (1) is spliced with the left longitudinal beam (2), and the right side of the main cross beam is spliced with the right longitudinal beam (3); wherein the following steps: main horizontal beam (1) is the integrative punching press of metal plate body or water rises moulding and forms, including front panel (4), rear panel (5), below board (6), the top of front panel (4) and rear panel (5) is connected for dog-ear top (14), then both are the setting of the shape structure of falling V word, bottom transverse connection below board (6) between them, below board uses central axis position to upwards extrude the arch formation X axle direction cross-section by the bottom and be both sides for trapezoidal or arc or the [ "character shape structure of arc top for horizontal straight down to form 3 parts, including roof coincide department (7) of central authorities and guide loudspeaker board portion (8) that extend down at the head and the tail both ends of roof coincide department (7), Y axle direction shape is V word shape or U word shape, the pitch arc angle of roof coincide department (7) is 120 at least, Y axle direction below board is connected the position dog-ear with front panel (4) and rear panel (5) respectively and is converted into angle and is formed The thickness of the inner wall of the front plate (4), the rear plate (5) and the lower plate (6) is at least 300 degrees, a noise reduction oil film layer (9) is formed in a solidifying and shaping mode, the thickness of the noise reduction oil film layer (9) at the inner wall of the top plate superposition part (7) is high, and the thickness of the inner wall of the guide horn plate part (8) is low; the top of front panel (4) and rear panel (5) is connected for dog-ear top (14), superposes with lower side board (6) of below, and both distances are not equal to 0 or not equal to 0 but are less than 0.2 cm.
Preferably, the V-shaped automobile main beam opening angle is 120 degrees.
And the left longitudinal beam (2) and the right longitudinal beam (3) are preferably provided with oblique oil inlet grooves at the positions of the oil injection holes.
Preferably, the front plate (4) and the rear plate (5) form a flaring structure outwards above the matching guide horn plate part (8) to form a tapered transverse plate (15), and the head end of the tapered transverse plate (15) is provided with a longitudinal beam top welding bite piece (16). The seaming structure can enable the cross beam to be better connected with the longitudinal beam, and the stress transmission is increased.
Preferably, the left longitudinal beam (2) and the right longitudinal beam (3) are of an expanding type pipe longitudinal beam structure with the same structure, and the whole structure is J-shaped. Is suitable for light vehicles.
Preferably, dog-ear connection points (12) are arranged below 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 spliced and welded by respective dog-ear connection points (13) of the left longitudinal beam (2) and the right longitudinal beam (3).
And the left longitudinal beam (2) and the right longitudinal beam (3) are preferably provided with oblique oil inlet grooves (17) at the positions of the oil injection holes. The structure is mainly characterized in that a groove is formed, so that the oil injection mechanical arm can be inclined inwards when spraying, and whether the oil injection mechanical arm is accurately injected into a spraying position or not can be detected when needed.
Preferably, a spring disc (18) is installed on an inner corner portion (15) formed by assembling the main cross beam (1) with the left longitudinal beam (2) and the right longitudinal beam (3), a sealing blocking piece (19) extends forwards, and the extending position of the sealing blocking piece (19) is matched with the setting position of the oil hole. After the spring disc (18) is installed with the main cross beam (1) and is assembled with the left longitudinal beam (2) and the right longitudinal beam (3) in an auxiliary assembly assembling process, the oil injection hole can be directly opened by one of two options, the other option is welding and sealing by a welding gun, the welding and sealing are not favorable for the quality of the main beam after all, namely, the spring disc (18) which is just provided with a sealing baffle sheet (19) can be completely attached to the bottom of the outer wall of the main cross beam and the bottom of the longitudinal beam from the bottom to completely seal the whole oil injection hole again, and the quality hidden danger of the last point 1 is eliminated.
Preferably, the guide horn plate portion (8) is flared at least 5 degrees. At least the front plate (4) and the rear plate (5) of the guide horn plate part (8) are expanded and pressed outwards to form a horn mouth structure expanded outwards by 5 degrees, and the lower plate can keep the original shape because of the expanded shape.
Compared with the prior art, the invention has the beneficial effects that: 1. the process method greatly reduces the adoption of the traditional oil injection film-forming technology which has complex process, high operation difficulty and low success rate in the prior art through the process method which is easy to operate and realize, and eliminates the condition that oil films are not uniformly distributed although oil films are generated in the prior art, and gaps have more oil-free film distribution points or the requirement on heat treatment is high, so that the injected noise-reducing oil can appear;
2. the method comprises the steps of obtaining noise reduction oil with a flash point as high as 170 ℃ and ~ as low as 100 ℃ by controlling and blending lubricating oil, injecting the noise reduction oil into main beams in V-shaped, C-shaped, U-shaped, arc-shaped, L-shaped, concave-L-shaped, L-shaped and other shapes by a sealing method, and forming an oil film by an independently developed heat treatment process, wherein the thickness of the formed oil film is consistent every time, and the process is stable;
3. the formed oil film is stable in distribution, and the key position points have no defect of incomplete oil film distribution points.
4. The noise-reducing oil which can automatically depend on the atomized state automatically forms an oil film at the structural position of the front side panel and the rear side panel at a distance close to 0cm automatically depending on natural phenomena rather than complex manual processing;
5. the complete oil film isolates all structural positions with the distance close to 0cm of the front side panel and the rear side panel which are in front-rear contact, so that the different loudness of the positions is close to 0 decibel, and the 'friction' sound caused by the inner wall of the main beam is completely eliminated;
6. the automobile noise reduction device has the advantages that the cost is extremely low, the manufacturing processing speed is high, abnormal sound of the main cross beam is greatly reduced, the overall NVH (noise, vibration and harshness) capability of an automobile is greatly improved, the noise reduction technology of the automobile is improved to a new step by the improvement of the capability, and higher social benefits are brought, for example, the loss possibly caused by automobile production manufacturers is greatly avoided due to the large-scale recall event brought by the abnormal sound, and the market competitiveness generated by our factory is greatly improved.
Drawings
FIG. 1 is an overall plan view;
FIG. 2 is a side perspective view of the main beam;
FIG. 3 is a front cross-sectional view of the main beam and stringer connection;
FIG. 4 is a cross-sectional view of the head and tail ends of the A-A main beam along the x-axis;
FIG. 5 is an enlarged view of the oil film structure;
FIG. 6 is a structural view of the connection between the leading horn plate and the longitudinal beam at the head end of the main beam B-B;
FIG. 7 is a cross-sectional view of the main cross member and the longitudinal member at C-C;
FIG. 8 is a view of the main cross member and longitudinal members and their assembly;
FIG. 9 is an embodiment view of the spray state of the oil hole;
FIG. 10 is a view of the spring holder embodiment 2;
in the figure: the novel oil guide plate comprises a main cross beam (1), a left longitudinal beam (2), a right longitudinal beam (3), a front square plate (4), a rear square plate (5), a lower square plate (6), a top plate superposition part (7), a guide horn plate part (8), a noise reduction oil film layer (9), an oil filling hole (10), an oil guide lifting slope (11), a dog-ear connecting point (12), a dog-ear top (13), an oblique oil inlet groove (14), an inner corner part (15), a spring disc (16), a sealing blocking piece (17), a conical transverse plate (18) and a longitudinal beam top welding blocking piece (19).
Detailed Description
The technical scheme of the invention is described in detail as the optimization by the embodiment and the attached drawings:
example 1
A preparation method of a main beam for increasing the integral NVH capacity of a vehicle comprises the following steps:
the method comprises the following steps that 1, a corresponding main beam (1) is manufactured, the main beam mainly corresponds to a structure in a technical range and comprises a front plate (4), a rear plate (5) and a lower plate (6), the front plate and the rear plate are folded and punched by a single metal plate body and then welded end to end or a pipe body is integrally extruded, folded, punched and the like to manufacture a cross section triangular structure, the lower plate (6) is extruded and expanded to be in a V shape, a C shape, a U shape, an arc shape, an L shape, a concave character, a L character and the like, the manufacturing mode of the latter is generally selected, the pipe body is directly expanded, and in the reprocessing process, the contact distance structure is ensured, wherein the distance between the folding position (7) of a top plate folded by the front plate (4) and the rear plate (5) and the inner wall of the lower plate (6) after expansion manufacturing processing is not equal to 0mm but smaller than 2cm ~ 0.2.2 mm at the central position of the whole top plate folding position (7);
6, plugging the oil injection hole (3) after the noise-reducing oil is injected into the main cross beam, wherein the sealing degree of the main cross beam is 100%;
step 9, controlling the noise reduction oil in the automobile beam body assembly to be completely atomized, taking out the automobile beam body assembly from the electrophoresis drying tunnel after the atomization processing temperature and the processing time are reached, placing and cooling the automobile beam body assembly to enable the noise reduction oil to be condensed again, wherein the thicker the oil film in the interval with the small gap formed by the tension of the noise reduction oil in the condensation process is, and the purpose of use is completely achieved;
and step 110, cooling the workpiece after the workpiece is taken out of the drying channel to form a noise-reducing oil film.
And 11, 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 tunnel in the step 7, the treatment temperature of the heat treatment is gradually increased to 200 ℃, and the heat treatment is kept for more than 30 minutes.
Preferably, when the oil holes (3) are punched in the step 2, 1 oil hole is respectively arranged on the main cross beam close to the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, the left oil filler and the right oil filler of the step 2 are respectively injected with 10ml of noise reduction oil at the time of the step 5, and 20ml of noise reduction oil is injected into the main beam in total.
Preferably, the V-shaped main beam opening angle of the step 1 is 120 °.
Preferably, the heat treatment and cooling and condensing processes of the electrophoresis drying tunnel are performed in the upright or inverted state of the V-shaped main beam processed in the steps 10 and 11.
As shown in FIG. 1, the structure of the present invention is mainly developed on the expansion beam technology, and example 1
As shown in figure 1, the structure of the main beam is mainly developed on the expansion beam technology, and the 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 longitudinal beam (2) is arranged on the left side of the main beam (1) in a splicing mode, and the right longitudinal beam (3) is arranged on the right side in a splicing mode;
wherein the following steps: continuing to refer to 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, wherein a whole metal pipe with high manufacturing speed is selected for expansion, the expansion is triangular, so that a front plate (4) inclining 45 degrees backwards at the left side 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) inclining 45 degrees forwards is bent backwards from the top of the front plate (4), the front plate (4) and the rear plate (5) are extruded into an inverted V-shaped structure, and then the inverted V-shaped structure is connected with a lower plate (6) arranged at the bottom of the front plate (4) and the rear plate and arranged at the bottom of the rear plate, so that the conventional circular pipe can be extruded into a triangular pipe body with 1 right-angle cross section;
then, the expanding processing is carried out, as shown in fig. 2, the lower plate is extruded upwards by water expanding at the outer side position of the outer wall from the central transverse axis position of the bottom, and the central extrusion stress is the most, so that the lower plate (6) is transversely connected with the bottom of the front plate and the rear plate of the lower plate, the lower plate is formed into a Y-axis direction cross section which is a trapezoid or arc or a structure with two sides being downward arcs and the top being transverse straight by the bottom upwards extruding bulge at the central axis position of the Y-axis surface, and 3 parts are formed, including a central top plate overlapping part (7) and guide horn plate parts (8) extending downwards at the head end and the tail end of the top plate overlapping part (7);
the cross section of the processed lower plate (6) in the Y-axis direction is in a V shape as shown in figures 3 and 4, the arc angle of the folded angle top (13) is at least 120 degrees, and the folded angle of the bent position where the lower plate in the X-axis direction is respectively connected with the front plate (4) and the rear plate (5) is at least 300 degrees; the structure that the convex part of the plate body of the lower plate (6) at the top is infinitely close to the folded angle top (13) from the bottom is formed, and the round or water drop-shaped cavity structure is formed after the lower plate (6) at the bottom and the front plate (4) or the rear plate (5) are extruded, expanded and bent;
the arrangement is that the main beam can achieve a nearly complete double-layer structure, the bottom of the main beam needs to increase the distance thickness because oil or oil mist is introduced, and a larger stress mode can be generated when the front side and the rear side of the main beam are stressed, namely, as shown in figure 2, if the stress comes from the right side, the stress surface has at least 150 degrees, and if the folded angle top (13) is arranged to be 120 degrees, the stress is estimated to be only 60 degrees ~ 40 degrees, so that the arrangement is not beneficial to stress conduction and impact resistance of the main beam (1);
finally, in order to lead noise reduction oil into the main beam (1), oil injection holes (10) are arranged at the central axis position of the X axis of a lower plate (6) of the guide horn plate part (8) of the main beam (1), namely the head end and the tail end of the main beam, oil guide lifting slopes (11) are formed in a shaping mode towards the inside of the pipe body by taking the oil injection holes (10) as head end starting points, the oil guide lifting slopes (11) are a structure which is formed by extruding and expanding the lower plate (6) at the bottom position of the guide horn plate part (8) to form a circular arch body shaping mode, the oil guide lifting slopes mainly expand from front to back to form a slow front slope and a large opening, and the steep rear slope and a small opening, so that a bucket opening structure for guiding oil mist is formed, and the oil mist is enhanced to be transmitted to the center;
in the traditional technology, a double-sandwich structure without a gap or with a gap smaller than 2cm is formed by the top part (13) of the break angle and the rear plate with a central folding rear bulge, when a main beam is twisted left and right and impacted front and back, the sandwich or double-sandwich structure can generate the sound generated by the friction of the two plate bodies, if the sound is eliminated, the sandwich structure is not used or the gap is increased, so that the stress differentiation capability of the main beam is reduced, therefore, the technology can arrange 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 solidifying and shaping mode, the top part (13) of the break angle connected with the top part of the front plate (4) and the rear plate (5) is overlapped with the top plate (7) bent at the top part of the lower plate arranged in a laminated mode, the distance between the top part (13) of the break angle and the top plate (7) is not equal to 0 or not equal to 0 but smaller than 0.2, a typical recommendation here is 0.2 mm; thus, the thickness of the inner wall of the noise reduction oil film layer (9) at the top plate superposition position (7) is high, the thickness of the inner wall of the guide horn plate part (8) is low, and the forming method of the noise reduction oil film layer is as follows:
and 3, injecting the noise reduction oil obtained in the step 2 into the main beam (1) through the main oil injection holes, wherein 10ml of noise reduction oil is respectively injected into the left and right oil injection holes of the main beam (1) in the injection process, the injection has two modes, 1 is instilled in the direct prior art in each market, and then the self improvement technology is adopted: 20ml of noise reduction oil is injected into the main beam (1) in total; attention is paid to the situation shown in figure 8 during oil injection, an oil gun of an oil injection mechanical arm is an elbow gun, atomization spraying is also carried out during injection, the dispersion can be uniform, the dispersion area is wide, the initially-installed beam body obtained in the step 2 is also downward in the process of dispersion, the dispersion of spraying can be paid attention to during atomization spraying, and the spraying can be directly sprayed under the guide of an oil guide lifting slope (11) to enter the whole break angle top (13) at the same line.
and 5, placing the secondarily assembled vehicle beam into an electrophoresis drying tunnel for baking after the surface electrophoresis line process. Atomizing the noise-reducing oil by using the temperature of the electrophoresis drying tunnel;
Preferably, the left longitudinal beam (2) and the right longitudinal beam (3) are of an expanding type pipe longitudinal beam structure with the same structure, and the whole structure is J-shaped. Is suitable for light vehicles.
Preferably, dog-ear connection points (12) are arranged below 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 spliced and welded by the respective dog-ear connection points (12) of the left longitudinal beam (2) and the right longitudinal beam (3).
Preferably, the oblique oil inlet grooves (14) are formed in the positions, on the oil injection hole, of the left longitudinal beam (2) and the right longitudinal beam (3). The oblique oil inlet grooves (14) have two functions that the oblique oil inlet grooves can be used for connecting the position of the longitudinal beam connecting clamping piece at the top and the position of the longitudinal beam connecting clamping piece at the bottom in oil injection so that the top atomized liquid can be divided and partially sink into the bottom in condensation, and the grooves can also be used for detecting when the spraying mechanical arm sprays to know the inner position for positioning.
Preferably, a spring disc (16) is installed on an inner corner portion (15) formed by assembling the main cross beam (1) with the left longitudinal beam (2) and the right longitudinal beam (3), a disc wing of the spring disc extends forwards to be provided with a sealing blocking piece (17), and the extending position of the sealing blocking piece (17) is matched with the setting position of the oil hole. After the spring disc (16) is installed with the main cross beam (1) and is assembled with the left longitudinal beam (2) and the right longitudinal beam (3) in an auxiliary assembly assembling process, the oil injection hole can be directly opened by one of two options, the other option is welding and sealing by a welding gun, the welding and sealing are not favorable for the quality of the main beam after all, namely, the spring disc (16) which is just provided with a sealing baffle sheet (17) can be completely attached to the bottom of the outer wall of the main cross beam and the bottom of the longitudinal beam from the bottom to completely seal the whole oil injection hole again, and the quality hidden danger of the last point 1 is eliminated.
Preferably, the guide horn plate portion (8) is flared at least 5 degrees. At least the front plate (4) and the rear plate (5) of the guide horn plate part (8) are expanded and pressed outwards to form a horn mouth structure expanded outwards by 5 degrees, and the lower plate can keep the original shape because of the expanded shape.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A preparation method of a main beam for increasing the integral NVH capacity of a vehicle comprises the following steps:
the method comprises the following steps that 1, a corresponding main cross beam is manufactured, the main cross beam mainly corresponds to a structure in a technical range and comprises a front plate, a rear plate and a lower plate, 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 are manufactured into a cross section triangular structure by the whole pipe body through processes of extrusion, folding, punching and the like, the lower plate is extruded and expanded to be in a V shape, a C shape, a U shape, an arc shape, an L shape, a concave character, a L character and the like, generally, the latter manufacturing mode is selected, the pipe body is directly expanded, and a contact distance structure that the distance between the folding position of a top plate folded by the front plate and the rear plate and the inner wall of the lower plate after expansion manufacturing processing is not equal to 0mm but less than 2cm ~ 0.2.2 mm is ensured in the whole folding position of the whole top plate or the central position of the folding position;
step 2, punching the manufactured main cross beam manufactured in the step 1 to manufacture an oil filling hole;
step 3, blending lubricating oil, wherein the flash point of the lubricating oil after blending is less than or equal to 170 ℃, and obtaining noise-reducing oil;
step 4, adding the left longitudinal beam and the right longitudinal beam matched with the main cross beam or other components to form a complete automobile beam body assembly;
step 5, injecting the noise-reducing oil obtained in the step 3 into the main cross beam through the oil injection hole manufactured in the step 2;
6, plugging the oil injection hole after the noise-reducing oil is injected into the main cross beam, wherein the sealing degree of the main cross beam is 100%;
step 7, the whole automobile beam body assembly assembled in the steps is subjected to a surface electrophoresis line process, then is put into an electrophoresis drying tunnel 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 tunnel;
step 9, controlling the noise reduction oil in the automobile beam body assembly to be completely atomized, taking out the automobile beam body assembly from the electrophoresis drying tunnel after the atomization processing temperature and the processing time are reached, placing and cooling the automobile beam body assembly to enable the noise reduction oil to be condensed again, wherein the thicker the oil film in the interval with the small gap formed by the tension of the noise reduction oil in the condensation process is, and the purpose of use is completely achieved;
step 10, cooling the workpiece after the workpiece is taken out of the drying channel to form a noise-reducing oil film;
and 11, detecting the integrity, the assembly quality and the elements of the whole assembled automobile beam body assembly.
2. The method for manufacturing the main beam capable of increasing the overall NVH (noise, vibration and harshness) capacity of the vehicle as claimed in claim 1, wherein the method comprises the following steps: in the heat treatment process of the electrophoresis drying tunnel in the step 7, the treatment temperature of the heat treatment needs to be gradually increased to 200 ℃, and the heat treatment is kept for more than 30 minutes.
3. The method for manufacturing the main beam capable of increasing the overall NVH (noise, vibration and harshness) capacity of the vehicle as claimed in claim 1, wherein the method comprises the following steps: and 2, when the oil hole is punched in the step 2, 1 oil hole is respectively arranged on the main cross beam close to the left longitudinal beam and the right longitudinal beam and is a left oil hole and a right oil hole respectively.
4. A method for manufacturing a main beam for increasing the overall NVH capacity of a vehicle according to claim 1 or 3, wherein the method comprises the following steps: and (3) respectively injecting 10ml of noise reduction oil into the left oil filling hole and the right oil filling hole in the step (2) in the step (5), and injecting 20ml of noise reduction oil into the main beam in total.
5. The method for manufacturing the main beam capable of increasing the overall NVH (noise, vibration and harshness) capacity of the vehicle as claimed in claim 1, wherein the method comprises the following steps: and 10, 11, performing heat treatment and cooling condensation processes of the electrophoresis drying tunnel under the condition that the processed V-shaped main beam is in an upright or inverted state.
6. The vehicle main beam obtained by the method for preparing the integral NVH capacity main beam of the vehicle according to claim 1 is characterized in that: a main beam for increasing the overall NVH capacity of a vehicle comprises a main cross beam, a left longitudinal beam and a right longitudinal beam, wherein the left side of the main cross beam is spliced with the left longitudinal beam, and the right side of the main cross beam is spliced with the right longitudinal beam; wherein the following steps: the main beam is formed by integrally stamping or water-expanding a metal plate 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, the front plate and the rear plate are arranged in an inverted V-shaped structure, the bottoms of the front plate and the rear plate are transversely connected with the lower plate, the lower plate is upwards extruded and expanded from the bottom to form a central axis position to form an X-axis cross section, the X-axis cross section is a trapezoid or arc or a reversed character-shaped structure with two sides being downward arc tops being horizontal and straight, 3 parts are formed, the guide horn plate comprises a central top plate superposition part and guide horn plate parts extending downwards from the head end and the tail end of the top plate superposition part, the Y-axis cross section is in a V shape or a U shape, the angle of the top plate superposition part is at least 120 degrees, the Y-axis lower plate is respectively connected with the front plate and the rear plate, the folded position, The inner walls of the rear plate and the lower plate are provided with a noise reduction oil film layer in a solidifying and shaping manner, the thickness of the inner wall of the noise reduction oil film layer at the superposition position of the top plate is high, and the thickness of the inner wall of the guide horn plate part is low; the top of front panel and rear panel is connected for the dog-ear top, and the lower side board coincide with the below, and both distances are not equal to 0 or not equal to 0 but be less than 0.2 cm.
7. The vehicle main beam obtained by the method for manufacturing the integral NVH capacity main beam of the vehicle as claimed in claim 6, wherein the method comprises the following steps: and the left longitudinal beam and the right longitudinal beam are provided with oblique oil inlet grooves at the position of the oil injection hole.
8. The vehicle main beam obtained by the method for manufacturing the integral NVH capacity main beam of the vehicle according to claim 1, which is characterized in that: the main beam is provided with a spring disc at an inner angle part formed by assembling the main beam with the left longitudinal beam and the right longitudinal beam, a disc wing of the spring disc extends forwards to be provided with a sealing separation blade, and the extending position of the sealing separation blade is matched with the setting position of the oil hole.
9. The vehicle main beam obtained by the method for manufacturing the integral NVH capacity main beam of the vehicle according to claim 1, which is characterized in that: the pilot horn plate portion expands outwardly by at least 5 °.
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