CN111687600B

CN111687600B - Automobile top cover forming process method and automobile top cover

Info

Publication number: CN111687600B
Application number: CN202010532725.0A
Authority: CN
Inventors: 刘迪祥; 方玲; 刘永根
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-07-30
Anticipated expiration: 2040-06-09
Also published as: CN111687600A

Abstract

The invention relates to a forming process method of an automobile top cover and the automobile top cover. The forming process method of the automobile top cover comprises the following steps: forming corner features at corner parts around the skylight hole part of the blank, and drawing and forming the blank to obtain a semi-finished top cover product; and arranging multistage sinking platform steps on the flanging side walls at two sides of the top cover semi-finished product, and performing flanging and shaping on the top cover semi-finished product to obtain a top cover forming product. The invention aims to solve the problems that after two sides of a skylight on an automobile top cover are flanged and shaped, the two sides of the skylight are wavy and have corner deformation in the traditional technology.

Description

Automobile top cover forming process method and automobile top cover

Technical Field

The invention relates to the technical field of automobile body forming, in particular to an automobile top cover forming process method and an automobile top cover.

Background

The automobile top cover is an outer covering part commonly used in the automobile industry, the stamping process scheme of the automobile covering part is designed to determine the working procedures of drawing, trimming, punching, flanging, shaping and the like and the process supplement schemes of all the working procedures according to the structural shape and the technical requirements of a product, and the reasonable process supplement and the process scheme can reduce various quality defects. However, in the conventional technology, in order to provide a large-sized sunroof on a roof of a vehicle, quality problems such as waves and corner deformation may occur on both sides of the sunroof after both sides of the sunroof on the roof of the vehicle are subjected to flanging and shaping.

Disclosure of Invention

Based on the above, the invention provides a forming process method of an automobile top cover and the automobile top cover, and aims to solve the problems that after two sides of a skylight on the automobile top cover are subjected to flanging and shaping in the prior art, the two sides of the skylight are wavy and have corner deformation.

In order to achieve the purpose, the invention provides the following technical scheme:

a forming process method of an automobile top cover comprises the following steps:

forming corner features at corner parts around the skylight hole part of the blank, and drawing and forming the blank to obtain a semi-finished top cover product;

and arranging multistage sinking platform steps on the flanging side walls at two sides of the top cover semi-finished product, and performing flanging and shaping on the top cover semi-finished product to obtain a top cover forming product.

Optionally, the step of forming corner features at the corner parts around the skylight hole part of the blank includes the following specific steps:

arranging a process supplement modeling area at the skylight hole part of the blank, and performing skylight hole process supplement characteristics at the process supplement modeling area;

and respectively forming the corner features at the peripheral corner positions of the technological supplementary features of the skylight opening, and arranging the convex features at the corner features.

Optionally, the step of forming the corner features at the peripheral corner positions of the complementary feature of the skylight opening process and providing the raised features at the corner features includes the following specific steps:

forming the corner features on the peripheral corner parts of the technological supplementary features of the skylight opening respectively, so that the cross section of each corner feature forms a corner sunken platform feature;

and arranging a plurality of convex features at the bottom of each corner sunken platform feature, so that the end parts of the convex features face the direction of the flanging side wall from the skylight hole.

Optionally, the step of "setting up multistage sunken platform steps on the flanging side walls on the two sides of the top cover semi-finished product, and performing flanging and shaping on the top cover semi-finished product" includes the following specific steps:

a secondary sinking platform step is arranged on the side wall of the flanging at the peripheral side of the top cover semi-finished product;

and driving a pressure plate to be tightly pressed at the technological supplement feature of the skylight opening and a part of position between the technological supplement feature of the skylight opening and the flanging side wall by using a pressure source to perform flanging and shaping on the flanging side wall.

Optionally, before the step of drawing and forming the blank to obtain the semi-finished product of the top cover, the method comprises the following steps:

and respectively arranging a plurality of circular step features at the peripheral corner parts of the semi-finished top cover, and enabling the center of each circular step feature to have a cross feature.

Optionally, before the step of "flanging and shaping the top cover semi-finished product", the method comprises the following steps:

a plurality of tail gap characteristics are respectively arranged at the end part of the top cover semi-finished product;

and tail boss features are arranged among the tail notch features at the end part of the top cover semi-finished product, and boss reverse arc features are arranged at the end part of the tail boss features.

Optionally, after the step of drawing and forming the blank to obtain the semi-finished product of the top cover, the method comprises the following steps:

trimming the semi-finished product of the top cover through a trimming cutter block;

and an air blowing device is arranged above the trimming knife block to blow off scrap iron waste generated in the trimming process, and a magnetic device is arranged below the trimming knife block to adsorb the scrap iron waste generated in the trimming process.

Optionally, after the step of "providing a plurality of steps on the flanging side walls on the two sides of the top cover semi-finished product and performing flanging and shaping on the top cover semi-finished product", the method further comprises the following steps:

spreading materials on the flanging side wall in advance according to the jaw shape of the top cover forming product, and calculating to obtain the edge line of the top cover semi-finished product after drawing and forming a jaw material plate before flanging and shaping, so that the edge line forms a trimming line;

trimming the claw plate according to the trimming line obtained through calculation to obtain a semi-formed claw before upper trimming and shaping;

and performing upper flanging and shaping on the trimmed semi-formed clamping jaw to obtain a clamping jaw structure.

Optionally, after the step of performing upward flanging and reshaping on the trimmed semi-formed jaw to obtain the jaw structure, the method further includes the following steps:

detecting the jaw surface difference and the seam allowance precision of the jaw structure through a detection tool, and adjusting the trimming line according to the detection result;

and trimming and upper flanging and reshaping are carried out on the jaw structure again according to the trimmed line after trimming and reshaping, so as to obtain a final jaw structure.

In addition, the invention also provides the automobile top cover which is processed and formed according to the automobile top cover forming process method.

According to the technical scheme provided by the invention, the corner features are formed at the corner parts at the periphery of the skylight hole part of the blank, so that the rigidity and the strength of the corner parts at the periphery of the skylight hole part can be enhanced, and the corner parts are prevented from deforming in the stamping forming process; in addition, the protection steps are formed by arranging the multistage sinking platform steps on the side walls of the flanging, so that the rigidity and the strength of the side walls of the flanging can be enhanced, and the appearance surfaces of two sides of the skylight opening are prevented from being subjected to wave deformation in the flanging and shaping process. Thus, the forming quality of the automobile roof can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a conventional roof panel (wavy deformation and corner deformation on both sides of a roof window after flanging and shaping);

FIG. 2 is a schematic flow chart illustrating the steps of the automobile roof forming process of the present invention;

FIG. 3 is a schematic bottom view of the automobile roof manufactured by the method of the present invention;

FIG. 4 is a partially enlarged schematic structural view of a portion of the location of the process additive molding area of the vehicle roof of FIG. 3;

FIG. 5 is a schematic cross-sectional structural view of the process additive molding area of the automobile roof of FIG. 3;

FIG. 6 is a partially enlarged schematic view of a corner portion of the automobile roof shown in FIG. 3;

FIG. 7 is a cross-sectional structural view of a corner portion of the automobile roof of FIG. 3;

FIG. 8 is a partially enlarged schematic structural view of a portion of the position of the flanging side wall of the automobile roof of FIG. 3;

FIG. 9 is a schematic cross-sectional view of the flanged side wall of the vehicle roof of FIG. 3;

FIG. 10 is a partially enlarged schematic structural view of a portion of the vehicle roof of FIG. 3 where a circular step feature is provided;

FIG. 11 is a partially enlarged schematic structural view of the automobile roof (scrap iron removal during machining) of FIG. 3;

FIG. 12 is a partial enlarged structural view of the rear end of the vehicle roof shown in FIG. 3;

FIG. 13 is a partially enlarged structural view of a flanged side wall (claw structure) of the automobile roof shown in FIG. 3;

FIG. 14 is a schematic structural view of a claw structure (when a detection tool is used for detection) of a flanging side wall of the automobile roof in FIG. 3;

FIG. 15 is a schematic structural view of a claw structure (after trimming) of the flanging side wall of the automobile roof cover in FIG. 3.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The automobile top cover is an outer covering part commonly used in the automobile industry, the stamping process scheme of the automobile covering part is designed to determine the working procedures of drawing, trimming, punching, flanging, shaping and the like and the process supplement schemes of all the working procedures according to the structural shape and the technical requirements of a product, and the reasonable process supplement and the process scheme can reduce various quality defects. However, in the conventional technology, in order to provide a large-sized sunroof on the sunroof 100, quality problems such as waviness 102 and corner deformation 104 may occur on both sides of the sunroof after both sides of the sunroof on the sunroof 100 are subjected to flanging and shaping (as shown in fig. 1). In order to solve the technical problems, the invention provides an automobile top cover forming process method and an automobile top cover processed and manufactured according to the process method.

As shown in fig. 2 to 9, the process for forming the automobile roof of the present invention comprises the following steps:

s100, forming corner features 230 at corner parts around the skylight hole 110 of the blank, and drawing and forming the blank to obtain a semi-finished top cover;

and S200, arranging multistage sunken table steps 122 on the flanging side walls 120 on the two sides of the top cover semi-finished product, and performing flanging and shaping on the top cover semi-finished product to obtain a top cover forming product.

By forming corner features 230 at the corner parts around the skylight hole 110 part of the blank, the rigidity and strength of the corner parts around the skylight hole can be enhanced, and the deformation of the corner parts in the stamping forming process is avoided; in addition, the protection steps are formed by arranging the multistage sunken table steps 122 on the flanging side wall 120, so that the rigidity and the strength of the flanging side wall 120 can be enhanced, and the appearance surfaces on two sides of the skylight opening 110 are prevented from being subjected to wave deformation in the flanging and shaping process. Thus, the molding quality of the automobile roof 100 can be improved.

In step S100, the step of forming corner features in the corner portions around the skylight hole portion of the blank includes the following specific steps:

and S110, arranging a process supplement modeling area 200 at the skylight opening 110 of the blank, and performing skylight opening process supplement characteristics at the process supplement modeling area 200. Namely, in the initial stage, a process supplementary modeling area 200 is arranged in the middle of the plate-shaped blank, and the process supplementary modeling area 200 is punched in the later stage to form the skylight hole 110, so that the formed automobile top cover 100 forms the automobile top cover with the skylight. However, in this embodiment, by arranging the process supplementary modeling area 200 in advance at the skylight opening 110 of the blank and forming the skylight opening process supplementary feature at the process supplementary modeling area 200, the strength and rigidity of the skylight opening 110 can be enhanced, and deformation (such as corner deformation 104 and wave deformation 102) in the area around the skylight opening 110 during the blank drawing can be reduced or even avoided.

Step S120, forming the corner features 230 at the peripheral corner portions of the complementary features of the skylight opening process, and disposing raised features 234 at the corner features 230. The corner features 230 are respectively formed at the corner parts around the technological supplementary features of the skylight opening, so that the strength and the rigidity of the corners around the skylight opening 110 can be further enhanced, and the stress concentration at the corners can be reduced; and the provision of raised features 234 at the corner features 230 reduces tensile stresses and flange cracking during subsequent flanging. Thus, stress concentration at the time of flanging the corner portion can be further reduced, and the stress concentration is transmitted to the appearance surface near the corner portion, so that the appearance surface is subjected to corner deformation and wavy deformation.

Further, in the step S110, that is, the step of performing the skylight opening process supplementary feature at the process supplementary modeling area includes the following steps:

step S112, forming an annular sunken platform feature 210 at the process complementary modeling area 200. The cross section of the annular sinking platform feature 210 is of a U-shaped structure, one side, close to the skylight opening supplementing surface feature 220, of the annular sinking platform feature 210 is in transitional connection through a large round angle, the angle is moderate and smooth, so that in the forming process, more plates flow in from the middle waste end of the skylight, and the influence of the forming process on the product features is reduced. Moreover, when forming the annular sunken mesa feature 210, an annular upper rounded feature 236 (located on a side away from the complementary surface feature 220 of the skylight opening) may be formed at the bottom of the complementary shaping region 200 (corresponding to the skylight opening), and then the annular sunken mesa feature 210 may be formed on the basis of the annular upper rounded feature 236, so as to reduce deformation during the forming process.

Step S114, forming a skylight hole complementary surface feature 220 in the middle of the annular sinking platform feature 210, where the annular sinking platform feature 210 and the skylight hole complementary surface feature 220 form the skylight hole process complementary feature. Namely, stamping is performed in the middle of the process supplementary modeling area 200, so that the middle part of the annular sunken platform feature 210 is sunken downwards, and the skylight opening 110 is formed with a reverse arc feature lower than the product surface, namely, the skylight opening supplementary surface feature 220 is formed. Therefore, the plate can be fully formed as much as possible, and the rigidity and the strength of the part are improved.

Furthermore, in step S120, that is, the step of forming the corner features at the corner portions around the supplementary feature of the skylight opening process and providing the raised features at the corner features includes the following specific steps:

step S122, forming the corner features 230 on the peripheral corner portions of the complementary features of the skylight opening process, so that a corner sunken step feature 232 is formed in the cross section of each corner feature 230. Namely, corner sinking features 232 are respectively formed at the corner parts of the periphery of the skylight opening 110 to strengthen the corner parts of the skylight opening 110, so as to avoid corner deformation at the corner parts of the skylight opening 110 in the subsequent stamping process. Also, the corner sinker feature 232 may be part of the peripheral corners of the annular sinker feature 210 described above. Moreover, the ring-shaped sinker feature 210 may further include a straight-edge sinker feature of a straight-edge portion between the corner portions of the skylight opening 110, that is, the straight-edge sinker feature and the corner sinker feature 232 are connected to form the ring-shaped sinker feature 210, and are disposed around the skylight opening process complementary feature. Moreover, the height of the flanging of the corner sink-platform feature 232 is less than 10mm, the flanging of the straight-side sink-platform feature can be slightly larger, and the material edge of the corner sink-platform feature 232 is in uniform transition with the material edge of the straight-side sink-platform feature, so that stress concentration during flanging can be reduced, and the influence on product quality is reduced.

Step S124, disposing a plurality of the raised features 234 at the bottom of each corner sunken stage feature 232, so that the ends of the raised features 234 are directed from the skylight opening 110 toward the flanging side wall 120. In this embodiment, the raised features 234 may be provided as small water droplet features, i.e., elliptical small water droplet features that add 1-5mm to the bottom of the corner land features 232 to form the raised features 234. Moreover, the plate material is stored in advance, the small water drop characteristic is transversely arranged at the bottom of the corner sinking platform characteristic 232, the tip of the small water drop characteristic can face the direction of the outer side part of the skylight hole 110, and the tail end of the small water drop characteristic faces the direction of the skylight hole process supplement characteristic, so that the tensile stress and the flanging cracking in the flanging process are reduced conveniently. Also, in this embodiment, a plurality of water droplet features may be uniformly disposed at the corner land features 232.

In addition, in the step S100, before the step of "drawing and forming the blank", the method includes the steps of:

a plurality of circular step features 140 (as shown in fig. 10) are respectively arranged at the peripheral corner positions of the top cover semi-finished product (i.e. the peripheral corner positions of the top cover top surface and the flange side wall connecting part), and the center of each circular step feature 140 has a cross feature. By adding a plurality of locating features at the peripheral corner portions of the blank, these locating features can be used to fit a coordinate system. Furthermore, the positioning feature includes, but is not limited to, a circular step feature 140, a cross feature may be disposed in the middle of the circular step feature 140, and a center point of the cross feature is also a center point of the circular step feature 140, and coordinates of the center point are integers as much as possible. When the specific tool is manufactured, the positioning feature can be used as a small insert to be embedded on a die, so that on one hand, the corresponding mark can be pressed on a blank, and on the other hand, the mark can be used for replacing a bottom mark. Therefore, each product is provided with a plurality of marks after being produced, when the product is subjected to laser cutting or precision analysis, and a fitting coordinate system is established by corresponding equipment, the marks can be found by measuring equipment firstly, then the marks are fitted with a product digifax, and then subsequent measurement or laser cutting is carried out, so that the accuracy of the established coordinate system can be effectively ensured. Therefore, cutting errors of the laser cutting edges or hole positions or errors of detection output precision can be avoided, and the product quality is further improved. In addition, the circular step feature 140 may be disposed at other positions of the top lid semi-finished product besides the corner portion of the top lid semi-finished product, such as on the top window opening process supplementary feature, or on the appearance surface near the top window opening 110.

After the step S100, namely the step of drawing and forming the blank to obtain the top lid semi-finished product, the method further includes the following steps:

an air blowing device 20 is arranged above the trimming blade block to blow off scrap iron generated in the trimming process, and a magnetic device 30 is arranged below the trimming blade block to adsorb the scrap iron generated in the trimming process.

As shown in FIG. 11, the air blowing device 20 is added above by adding the magnetic device 30 (including but not limited to adding a magnet, an electromagnetic inductor, etc.) below the deburring cutter block easy to scrap iron, and the mouth of the air blowing nozzle of the air blowing device 20 is aligned with the easy scrap iron discharging position. When the mold 10 moves downwards to the bottom, the exhaust pipe of the air blowing device 20 above is ventilated and blown, the magnetic device 30 below is electrified and magnetized, so that scrap iron is blown down to the scrap groove or the magnet is attracted to the scrap cutter, and the scrap iron is prevented from being brought to the part above when the mold 10 moves upwards. Namely, by adding the magnetic device 30 and the air blowing device 20, the scrap iron can directly fall into the scrap groove below, and the phenomenon that the scrap iron is brought to the appearance surface of the automobile roof to cause impression and influence the product quality is avoided.

In addition, in the step S200, namely, the step of "setting a plurality of steps of a sunken table on the flanging side walls at both sides of the top cover semi-finished product and performing flanging and shaping on the top cover semi-finished product" includes the following specific steps:

step S210, a secondary sinking step 122 is provided on the flanging side wall 120 on the peripheral side of the top cover semi-finished product (as shown in fig. 8 to 9). Before the flanging and shaping are carried out on the flanging side wall 120 of the top cover semi-finished product, a secondary sunken platform step 122 can be arranged on the flanging side wall 120, so that the flanging side wall 120 can be reinforced to a certain degree, the step is formed in the shaping process, and when other flanging characteristics are shaped and formed, the influence on the appearance surface near the skylight hole 110 can be reduced by the step characteristics, so that the wave deformation generated near the skylight hole 110 can be reduced or avoided. Furthermore, in the present embodiment, a two-stage forming step 122 may be provided on the burring side wall 120, or a three-stage forming step may be provided to form a multi-stage forming step.

Step S220, a pressure source is used for driving a pressure plate to be tightly pressed at the skylight opening process supplement feature and a part of the position between the skylight opening process supplement feature and the flanging side wall 120, and flanging and shaping are carried out on the flanging side wall 120. Namely, when the flanging and shaping are carried out, the skylight opening technological supplementary features at the skylight opening 110 position and the positions near the skylight opening technological supplementary features can be tightly pressed. Specifically, in the appearance surface area (such as the areas near two sides of the technological supplementary feature of the skylight opening) which is affected by flanging reshaping, the upper matched pressure plate is higher than the non-flanging reshaping area by 0.01-0.05mm in profile, so that the area is in a strong pressure state, and a pressure source (including but not limited to a device such as a nitrogen spring and the like) is added above the corresponding pressure plate, so that the appearance surface pressure of the easily-deformed area is higher. The processing methods can avoid the wave deformation of the appearance surfaces on the two sides of the skylight opening part in the flanging and shaping processes.

In addition, in step S200, before the step of "performing flanging and reshaping on the top cover semi-finished product", the method includes the following steps:

as shown in fig. 12, a plurality of tail relief features 132 are provided at the ends (tail ends 130) of the top lid blank, respectively. By providing the tail relief features 132 at both tail portions of the overcap, the depth of the drawing and shaping of the tail portion location of the overcap may be significantly reduced, thereby avoiding the risk of wrinkling and cracking of the overcap at the tail portion location.

A tail boss feature is provided between a plurality of the tail notch features 132 at the end of the top cap blank (tail end 130) and a boss anti-bow feature 134 is provided at the end of the tail boss feature. The tail part of the top cover is provided with the tail boss protruding outwards by arranging the boss anti-arc features 134 at the tail parts of the two sides of the top cover, and the tail boss is provided with the arc-shaped bulge corresponding to the side wall of the tail part. Therefore, the sheet can be formed more fully, the thinning rate of the part is improved, the rigidity of the part is further improved (the tail boss and the arc-shaped bulge do not increase the thickness of the tail side wall, but can enhance the rigidity of the tail side wall), and the problem that the rigidity of the tail part of the top cover is insufficient can be solved. In this embodiment, can set up the middle of two afterbody breach characteristics with the anti-arc characteristic of boss, it is better to the reinforcing effect of the afterbody of top cap.

In addition, in the step S200, after the step of "setting a plurality of steps of a sunken table on the flanging side walls on both sides of the top cover semi-finished product and performing flanging and shaping on the top cover semi-finished product", the method further includes the following steps:

spreading materials on the flanging side wall 120 in advance according to the jaw shape of the top cover forming product, and calculating to obtain the edge line of the top cover semi-finished product after drawing and forming a jaw plate before flanging and shaping, so that the edge line forms a trimming line 151;

trimming the claw material plate according to the trimming line 151 obtained by calculation to obtain a semi-formed claw before upper flanging and shaping;

and performing upward flanging and shaping on the trimmed semi-formed jaw to obtain a jaw structure 150.

As shown in fig. 13 to 15, the flanging sidewalls 120 on both sides of the top cover are respectively provided with a plurality of claw structures 150, and the forming process is finished by trimming and then shaping upwards. This jack catch structure 150 is used for the joint of exterior trim, and if the jack catch structure 150 precision of top cap both sides is unqualified can lead to exterior trim erection joint insecure, can appear the joint after long-term the use bad consequences such as not hard up, automobile body abnormal sound. The surface difference and the seam allowance of the jaw structure 150 are detected in the above manner, and the jaw structure 150 can be obtained by trimming the jaw according to the detection result, so as to solve the problem that the jaw structure 150 is unstable in connection with an external decoration and is easy to loose and have abnormal sound.

And after the step of performing upward flanging and shaping on the trimmed semi-formed jaw to obtain the jaw structure, the method further comprises the following steps of:

the jaw structure 150 is subjected to jaw surface difference and spigot precision detection through a detection tool, and the trimming line 151 is adjusted according to the detection result. The precision of the flanging side wall of the automobile roof is detected by the detection tool, as shown in fig. 14, wherein the precision detection of the claw structure 150 mainly comprises the surface difference and the spigot of the claw. The specific detection process is as follows: the surface difference precision of the clamping surface 152 of the jaw structure 150 is detected by using the clamping surface difference reference 42 of the checking fixture 40 as a reference, and the edge spigot precision of the clamping surface 152 is detected by using the clamping surface spigot reference 44 as a reference; similarly, the surface difference accuracy of the pawl side wall 154 is detected with reference to the side wall surface difference reference 46, and the side wall edge seam allowance accuracy is detected with reference to the side wall seam allowance reference 48.

And trimming and upturning and reshaping the jaw structure again according to the trimmed line 151 after trimming and reshaping, so as to obtain a final jaw structure 150. The trimming line 151 can be adjusted on the basis of ensuring the width accuracy of the clamping surface 152 according to the detection result, so that the edge seam allowance of the adjusted material has a certain error with the detection tool, and the error is finely adjusted and compensated by the pincers worker through adjusting the resilience of the side wall of the male die and the female die of the die.

If the jaw side wall 154 rebounds (within the tolerance allowed range), which inevitably causes the seam allowance of the clamping surface 152 to be out of tolerance and the seam allowance to be over long, the trimming line 151 is retracted inwards on the basis of ensuring the accurate width of the clamping surface 152 according to the detection result to obtain a new trimming line 151, and then the steps are repeated for verification until the jaw structure 150 is detected to be qualified.

If the jaw side wall 154 (connected with the flanging side wall 120 through the transition surface 156) is turned over excessively, which inevitably results in that the seam allowance of the clamping surface 152 is short, the trimming line 151 is biased outwards on the basis of ensuring the width of the clamping surface 152 according to the detection result to obtain a new trimming line 151, and then the steps are verified again and repeated in a circulating way until the jaw structure 150 is detected to be qualified.

In addition, the invention also provides the automobile top cover which is processed and formed according to the automobile top cover forming process method. According to the invention, by increasing the pre-forming process characteristics of the corner part, corner deformation at the corner positions around the skylight hole part in the stamping forming process is avoided; by adding the protection steps, the appearance surfaces on the two sides of the skylight opening are prevented from being deformed by waves in the flanging and shaping process; by adding fitting characteristic points in the drawing process, a coordinate system can be accurately fitted when laser cutting coordinates are fitted, and hole site cutting errors are avoided; through at the deburring sword piece position, increase magnetic device and gas blowing device, make iron fillings directly fall into the scrap chute of below, avoid iron fillings to bring the outward appearance face and lead to the impression. Therefore, the scrappage can be effectively reduced, the product quality can be improved, and the modification period and the workload of the die can be reduced on the premise of not increasing the cost; in addition, the whole precision of the top cover part can be improved on the basis of ensuring the width of the clamping surface of the clamping jaw, and further the precision of a white automobile body and the quality of the whole automobile are improved.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A forming process method of an automobile top cover is characterized by comprising the following steps:

forming corner features at the peripheral corner parts of the technological supplementary features of the skylight opening respectively, and arranging convex features at the corner features;

drawing and forming the blank to obtain a semi-finished product of the top cover;

arranging multistage sinking platform steps on the flanging side walls at two sides of the top cover semi-finished product, and performing flanging and shaping on the top cover semi-finished product to obtain a top cover forming product;

wherein the step of forming corner features at the peripheral corner positions of the complementary features of the skylight opening process, and arranging the convex features at the corner features comprises:

2. The forming process method of the automobile roof as claimed in claim 1, wherein the step of arranging multistage sinking platform steps on the flanging side walls at the two sides of the semi-finished roof and performing flanging and shaping on the semi-finished roof comprises the following specific steps:

3. The automobile roof forming process method according to claim 1, wherein the step of drawing and forming the blank to obtain the roof semi-finished product is followed by the following steps:

4. The forming process method of the automobile top cover according to claim 1, wherein the step of flanging and shaping the semi-finished product of the top cover comprises the following steps of:

5. The automobile roof forming process method according to claim 1, wherein the step of drawing and forming the blank to obtain the roof semi-finished product is followed by the following steps:

6. The forming process method of the automobile roof as claimed in claim 1, wherein after the step of arranging the multistage sinking platform steps on the flanging side walls at the two sides of the semi-finished roof and performing flanging and shaping on the semi-finished roof, the forming process method further comprises the following steps:

7. The forming process method for the automobile roof cover as claimed in claim 6, wherein after the step of performing upper flanging and shaping on the trimmed semi-formed jaw to obtain the jaw structure, the forming process method further comprises the following steps:

8. An automobile roof, characterized in that the automobile roof is formed by processing according to the automobile roof forming process method of any one of claims 1 to 7.