CN112588921A

Movatterモバイル変換

Info

Publication number: CN112588921A
Application number: CN202011237050.3A
Authority: CN
Inventors: 高双明; 刘峰; 崔礼春; 陈世涛; 阮林凡; 徐领; 余旸
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-04-02

Abstract

The invention discloses a stamping process and a stamping die for an outer plate of an automobile door, wherein the stamping process comprises the following steps: obtaining the reduction rate of each reference point on the blank after the simulation forming; according to the obtained thinning rate, determining the punch forming gaps at all the reference points; and obtaining a female die profile of a female die for performing punch forming on the blank according to the punch forming gaps at the reference points. The method comprises the steps of analyzing the forming process of the blank to obtain the thinning rate of the blank after simulation forming, determining the punch forming gaps at all reference points according to the thinning rate, and obtaining the female die profiles of different punch gaps according to different forming gaps of all the reference points, thereby solving the quality problem of appearance profile deformation caused by the fact that the forming gaps between an upper model surface and a lower model surface are not distinguished in the prior art.

Description

Automobile door outer plate stamping process and stamping die

Technical Field

The invention relates to the technical field of processing of outer plates of vehicle doors, in particular to a stamping process and a stamping die for outer plates of vehicle doors.

Background

Under the circumstance that automobile market competition is increasingly severe, car products are updated more and more quickly, the market has higher and higher requirements on fashion of automobile appearance, the style modeling is more and more novel, and the quality of an automobile outer covering piece is directly influenced by the quality of the automobile outer covering piece as a direct visual part of a consumer. Therefore, the high-quality and short-period development of the automobile body outer cover can quickly and directly convey the modeling intention of a new automobile type to a consumer, the automobile door outer plate is used as one type of the outer cover, the outer cover is usually produced by adopting a die for stamping, and the appearance quality of the automobile body is directly influenced by the technical documents for producing the automobile door outer plate and the quality of the die structure.

The automobile door outer plate part belongs to an A-type part in an automobile covering part and has the characteristics of gentle shape, few holes, shallow drawing depth, strict appearance quality requirement, sufficient forming rigidity and the like. After the process design of the existing vehicle door outer plate is finished, the existing die surface is directly used for designing a die structure, the gap between the upper and lower die surfaces of the die structure is deducted by the thickness of a plate and is not distinguished, and the appearance profile of the vehicle door outer plate is deformed due to the fact that the flowing of a blank can be changed according to the different shapes of parts in the stamping production and processing process.

Disclosure of Invention

The invention mainly aims to provide a stamping process and a stamping die for an outer plate of an automobile door, and aims to solve the problem of deformation of an appearance profile caused by unequal gaps at different positions of the outer plate of the automobile door after forming.

In order to achieve the purpose, the invention provides an automobile door outer panel stamping process, which comprises the following steps:

obtaining the reduction rate of each reference point on the blank after the simulation forming;

according to the obtained thinning rate, determining the punch forming gaps at all the reference points;

and obtaining a female die profile of a female die for performing punch forming on the blank according to the punch forming gaps at the reference points.

Optionally, the step of determining the punch forming gap at each reference point according to the obtained thinning rate includes:

determining the thinned thickness of each reference point of the thinned blank according to the obtained thinning rate;

dividing the blank into a plurality of thickness areas according to the thinned thickness, wherein the plurality of thickness areas comprise a first thickness area and a second thickness area;

according to thickness behind the attenuate, confirm the stamping forming clearance at each reference point department, wherein, the regional stamping forming clearance of first thickness is less than the thickness behind the attenuate of the blank of corresponding reference point department, and the regional stamping forming clearance of second thickness is greater than regional stamping forming clearance of first thickness.

Optionally, after the step of obtaining the reduction rate at each reference point on the blank after the simulation forming, the method further includes:

and dividing the blank into a plurality of thinning areas according to the obtained thinning rate, and determining a target area in the plurality of thinning areas for exhausting according to the thinning rate.

Optionally, it is a plurality of the attenuate region includes first attenuate region and second attenuate region, the attenuate rate in first attenuate region is 8% ~ 10%, the attenuate rate in second attenuate region is 5% ~ 6.5%, target attenuate region does the second attenuate region.

Optionally, the second attenuate area includes clearance district and transition district, the transition district is located the peripheral region in clearance district, the stamping forming clearance that the clearance district corresponds is greater than the stamping forming clearance that the transition district corresponds, the target area is located the clearance district.

Optionally, the width of the transition zone is 10-30 mm.

In addition, in order to achieve the above object, the present invention further provides a stamping die for an outer panel of an automobile door, the stamping die obtained by the stamping process for an outer panel of an automobile door, the stamping die comprising:

the molded surface of the male die is matched with the shape of the outer plate of the automobile door;

and the female die and the male die jointly define an extrusion area for blank extrusion forming of the automobile door outer plate.

Optionally, the stamping die further comprises an exhaust structure arranged on the female die and used for dividing the blank into a plurality of thinning areas according to the obtained thinning rate, and determining a target area in the thinning areas to exhaust according to the thinning rate.

Optionally, the exhaust structure includes a first groove and a second groove which are arranged in a cavity of a female die of the female die, the first groove is arranged along the length direction of the cavity of the female die in an extending manner, the second groove is arranged along the width direction of the cavity of the female die in an extending manner, the second groove is arranged along the length direction of the cavity of the female die at intervals, the second grooves are communicated with the first groove respectively, and a plurality of exhaust holes which are communicated with the external environment of the cavity of the female die are formed in the second groove.

Optionally, the groove depth of the first groove and the second groove is 1.5-2.5 mm.

According to the technical scheme, the reduction rate of the blank after simulation forming is obtained by analyzing the blank forming process, the punch forming gaps at the reference points are determined according to the reduction rate, the female die profiles with different punch gaps are obtained according to different forming gaps of the reference points, and the quality problem of appearance profile deformation caused by the fact that the forming gaps between the upper and lower die profiles are not distinguished in the prior art is solved.

Drawings

FIG. 1 is a schematic flow chart of a first embodiment of a stamping process for an outer panel of an automobile door according to the present invention;

FIG. 2 is a schematic flow chart of a second embodiment of the stamping process for the outer panel of the door of the automobile according to the present invention;

FIG. 3 is a schematic flow chart of a third embodiment of the stamping process for the outer panel of the door of the automobile according to the present invention;

FIG. 4 is a profile view of a male mold of the stamping mold for the outer panel of the automobile door of the present invention;

FIG. 5 is a profile view of a female die of the stamping die for the outer panel of the automobile door of the invention;

FIG. 6 is a profile view of a part of a female die of the stamping die for the outer panel of the automobile door of the invention;

fig. 7 is a partially enlarged view of a portion a in fig. 6.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Male diesurface	2	Female dieprofile
21	Firstthinned region	22	Secondthinned region
				221	Interstitial region	222	Transition zone
3	Exhaust structure	31	First groove
				32	Second groove	33	Air vent

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

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides an automobile door outer plate stamping process, and referring to fig. 1, fig. 1 is a schematic flow diagram of a first embodiment of the automobile door outer plate stamping process.

In a first embodiment, the automobile door outer panel stamping process includes the steps of:

step S10: obtaining the reduction rate of each reference point on the blank after the simulation forming;

in the embodiment, in the process design stage, the change of the blank in the flow forming process of the automobile door outer panel in the simulation forming process of each reference point of the part is fully analyzed, and the reduction rate of each reference point on the blank after the simulation forming is obtained. And obtaining a cloud picture of the thickness reduction rate of the blank of the outer plate of the automobile door after the simulated forming according to the thickness reduction rate of each reference point on the blank after the simulated forming obtained by analysis and calculation.

Step S20: according to the obtained thinning rate, determining the punch forming gaps at all the reference points;

according to the obtained thinning rate, the thinning rate of each reference point is found to be different, so that the stamping gap at each reference point can be determined according to the thinning rate, namely the stamping gap is the thickness of the blank after the simulation forming.

Step S30: and obtaining a female die moldedsurface 2 of a female die for performing punch forming on the blank according to the punch forming gaps at the reference points.

According to each reference point that the reduction rate of each reference point department of stock after the emulation shaping obtained behind the stamping forming clearance, obtain thedie profile 2 that accords with each reference point stamping forming clearance according to the stamping forming clearance again to improve thedie profile 2 that does not consider the stock shaping process reduction rate, thereby avoid making the distinction because of the stamping forming clearance, the profile that the blank is different everywhere to influence the car door planking is pleasing to the eye.

It should be noted that, here, the punch forming gap is obtained according to the reduction rate of each reference point of the blank obtained by the analysis and obtained by simulation, and then thefemale die surface 2 which does not affect the profile of the automobile door outer panel is obtained, and here, the male die surface 1 used in cooperation with thefemale die surface 2 is the male die surface 1 with the same shape as the shape of the automobile door outer panel.

In the embodiment, the blank after the simulation forming is firstly analyzed to obtain the reduction rate of each reference point after the blank is subjected to the simulation forming, so that the real punch forming gap is obtained according to the reduction rate, and the new female die moldedsurface 2 is obtained to distinguish and treat the punch forming gap of each reference point, thereby avoiding unqualified appearance molded surface quality and attractive influence caused by punch forming of the automobile door outer panel because the punch forming gap does not accord with the actual requirement.

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

Referring to fig. 2, fig. 2 is a schematic flow chart of a second embodiment of the stamping process for the outer panel of the automobile door according to the present invention.

Based on the first embodiment, the step S20 of the stamping process for the outer panel of the automobile door of the embodiment includes:

step S21: determining the thinned thickness of each reference point of the thinned blank according to the obtained thinning rate;

specifically, according to the obtained reduction ratio, the punch forming gaps at the reference points are determined, the thickness of the thinned blank at the reference points is calculated according to the reduction ratio, and the thinned blank is the value obtained by subtracting the original thickness and the reduction ratio from the original thickness.

Step S22: dividing the blank into a plurality of thickness areas according to the thinned thickness, wherein the plurality of thickness areas comprise a first thickness area and a second thickness area;

specifically, in the actual calculation, the reference points with similar thinned thicknesses are divided into one area according to the thinned thicknesses of the obtained blanks, so that the blanks can be divided into a plurality of thickness areas according to the thinned thicknesses of different reference points, and the divided areas, including the first thickness area and the second thickness area, respectively correspond to the complicated modeling area at the door handle and the relatively flat modeling area outside the door. ,

step S23: according to thickness behind the attenuate, confirm the stamping forming clearance at each reference point department, wherein, the regional stamping forming clearance of first thickness is less than the thickness behind the attenuate of the blank of corresponding reference point department, and the regional stamping forming clearance of second thickness is greater than regional stamping forming clearance of first thickness.

In the first thickness area, namely the area where the door handle is located, the thinning rate is large, the obtained blank is small in thickness after being thinned, the shape of the area is complex, the defect of appearance quality is easily caused due to the complex stress state in the product forming process, and the punch forming gap, namely the profile gap design of the female die and the male die, is smaller than the thickness of the thinned blank. In the area, the male die and the female die are completely closed, and then the blank is forced to be compressed again on the basis of original thinning, so that the problem of uneven surface caused by complex modeling and large material thickness change is solved. And the numerical value of the punch forming gap of the first thickness area is set and calculated according to the change of the thinning rate obtained by analysis. In the second thickness region, because the attenuate rate is little, thickness phase difference is not big and the profile is regular after the attenuate of each reference point, and the part takes shape and can accomplish through peripheral regional drive natural stretching, consequently, design the stamping forming clearance for big clearance when 2 designs of technology die profile, the stamping forming clearance of here is greater than the regional stamping forming clearance of first thickness promptly, is favorable to reducing the research and development work load of mould production debugging stage on the one hand, on the other hand carries out exhaust design in the die cavity when making things convenient for structural design.

This embodiment calculates the thickness after the attenuate of each reference point of stock through the obtained attenuate rate, divides a plurality of thickness regions according to the thickness after the attenuate of each reference point again, designs the stamping forming clearance in first thickness region for being less than the thickness after the stock attenuate, designs the stamping forming clearance in second thickness region for being greater than the stamping forming clearance in first region, from this obtains right the blank carries out thedie profile 2 of stamping forming's die.

Referring to fig. 3, fig. 3 is a schematic flow chart of a third embodiment of the stamping process for the outer panel of the automobile door according to the present invention.

Based on the first embodiment, the stamping process for the outer panel of the automobile door of the present embodiment further includes, after the step S10:

step S11: and dividing the blank into a plurality of thinning areas according to the obtained thinning rate, and determining a target area in the plurality of thinning areas for exhausting according to the thinning rate.

After the thinning rate is obtained, the thinning rate cloud chart obtained through analysis and calculation can find that although the thinning rates of all reference points of the blank are different, areas with similar thinning rates exist, so that after the thinning rate is obtained, the similar thinning rates can be divided into the same area, and the blank is divided into a plurality of thinning areas. In the existing stamping production and processing process, the flowing of the blank can be changed according to the different shapes of parts, a closed cavity can be formed between the blank and the female die after the blank holder and the female die are closed, at the moment, in the closed cavity, the problem of unsmooth gas discharge of the die exists, and the quality of the appearance profile of the outer plate of the automobile door can be difficult to guarantee. Therefore, after the areas are divided on the blank, the complexity of the part can be judged according to the difference of the reduction rates, and then a target area is determined to exhaust in the corresponding female die cavity, so that the influence on the appearance profile quality of the automobile door outer plate due to unsmooth exhaust in the closed female die cavity is avoided.

Further, it is a plurality of the attenuate region includes firstattenuate region 21 and secondattenuate region 22, the attenuate rate of firstattenuate region 21 is 8% ~ 10%, the attenuate rate of secondattenuate region 22 is 5% ~ 6.5%, target attenuate region does second attenuateregion 22.

According to the actually obtained reduction rate of each reference point of the blank after simulation forming, the reduction rate is found to be up to 10%, namely the outer plate of the automobile door is designed by adopting a plate with the thickness of 1mm, the plate is reduced by 0.1mm after forming, and the final thickness after reduction is 0.9 mm. The larger the reduction rate of the blank after the simulation forming is, the more complicated the shape of the area is, and the defect of appearance quality is easily generated due to the complicated stress state in the product forming process. According to the modeling of the automobile door outer plate and the obtained thinning rate of each reference point, the plurality of thinning areas comprise a first thinningarea 21 and a second thinningarea 22, the first thinningarea 21 corresponds to the position of a door handle of the automobile door outer plate, the thinning rate of the area reaches 8% -10%, the second thinningarea 22 corresponds to the middle profile regulating area of the automobile door, the thinning rate is only about 5%, and the thinning rate of the second thinningarea 22 is within the range of 5% -8%, so that the target area for exhausting is determined to be the second thinningarea 22.

It should be noted that the first thinnedregion 21 herein corresponds to the first thickness region in the second embodiment of the stamping process for an outer panel of an automobile door of the present invention, and the second thinnedregion 22 herein corresponds to the second thickness region in the second embodiment of the stamping process for an outer panel of an automobile door of the present invention.

Further, the second thinningregion 22 includes agap region 221 and atransition region 222, thetransition region 222 is located in a peripheral region of thegap region 221, a stamping forming gap corresponding to thegap region 221 is greater than a stamping forming gap corresponding to thetransition region 222, and the target region is located in thegap region 221.

Because the second thinningarea 22 has smaller thinning rate and regular profile, the outer plate of the automobile door can be naturally stretched under the driving of the peripheral area in the forming process. Therefore, the vent area is set here, thetransition area 222 of the second thinningarea 22 is arranged at the periphery of the vent area, and thetransition area 222 is used for buffering, so that the problem that the part is indented due to severe gap change is avoided.

Further, the width of thetransition region 222 is 10-30 mm.

The width of thetransition area 222 is set within the range of 10-30 mm, so that surrounding gas can be gathered towards the middle, part indentation caused by severe gap change is avoided, and thetransition area 222 is set, so that the problem can be relieved.

According to the embodiment, a plurality of thinning areas are divided through reference points where the thinning rates of the blanks are different, and then the areas suitable for exhausting are selected from the thinning areas for exhausting, so that the influence on the appearance profile quality of the automobile door outer plate due to unsmooth exhausting in the closed cavity of the female die is avoided. The step can be carried out while distinguishing the punch forming gap, and simultaneously, the problem of poor appearance profile quality of the automobile door outer plate caused by unsmooth exhaust in the punch forming gap and the female die cavity is avoided.

In addition, the invention also provides a stamping die obtained in the stamping process embodiment of the automobile door outer panel, and the stamping die refers to fig. 4 to 7.

As shown in fig. 4 and 5, the stamping die for the automobile door outer panel comprises a male die and a female die, wherein the molded surface 1 of the male die is matched with the shape of the automobile door outer panel; the female die and the male die jointly define an extrusion area for blank extrusion forming of the automobile door outer plate;

by designing the male die molded surface 1 of the male die to be matched with the shape of the outer plate of the automobile door and designing the female die moldedsurfaces 2 with different punch forming gaps in areas with different thicknesses according to the stamping process method, the problem of deformation of the appearance molded surface caused by different positions and gaps of the formed part is solved. The punch forming gap is the thickness of an extrusion area defined by the molded surfaces of the female die and the male die together.

Further, the automobile door outer stamping die further comprises anexhaust structure 3 arranged on the female die and used for completing an exhaust step in the third embodiment of the automobile door outer plate stamping process.

Thevent structure 3 is arranged on the female die corresponding to the second thinningarea 22, so that the problem of deformation of the appearance profile caused by increase of air pressure due to unsmooth air discharge in the die cavity after the female die and the male die are closed is facilitated.

Further, as shown in fig. 6 and 7, theexhaust structure 3 includes afirst groove 31 and asecond groove 32 which are disposed in a cavity of the female die, thefirst groove 31 extends along a length direction of the cavity of the female die, thesecond groove 32 extends along a width direction of the cavity of the female die, thesecond grooves 32 are disposed at intervals along the length direction of the cavity of the female die, thesecond grooves 32 are respectively communicated with thefirst groove 31, and thesecond grooves 32 are provided with a plurality of exhaust holes 33 which are used for being communicated with an external environment of the cavity of the female die.

The vent holes 33 are communicated with the external environment of the cavity of the female die, gas in the cavity of the female die is exhausted out of the die, and the vent holes 33 are communicated through thefirst groove 31 and thesecond groove 32, so that the positions are communicated with each other, and the condition that the gas is exhausted unclean due to the fact that a part of the area die is firstly closed is prevented. Specifically, the directions of thefirst groove 31 and thesecond groove 32 are determined according to the change of the thinning rate of the analysis result, and are not limited to the horizontal and vertical directions, and may be inclined at any angle.

Further, the groove depth of thefirst groove 31 and thesecond groove 32 is 1.5-2.5 mm.

The groove depth of thefirst groove 31 and thesecond groove 32 is set to be 1.5-2.5 mm, so that the strength of parts can be guaranteed, and gas can be discharged smoothly.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, the technical details that are not described in detail in this embodiment can be referred to the stamping process of the outer panel of the vehicle door provided by any embodiment of the present invention, and are not described herein again.

Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The stamping process of the outer plate of the automobile door is characterized by comprising the following steps of:

2. The automobile door outer panel stamping process according to claim 1, wherein the step of determining the punch forming gap at each reference point according to the obtained thinning rate includes:

3. The automobile door outer panel stamping process according to claim 1, wherein after the step of obtaining the reduction rate at each reference point on the blank after the simulation forming, the process further comprises:

4. The automobile door outer panel stamping process according to claim 3, wherein the plurality of thinning regions include a first thinning region and a second thinning region, the thinning rate of the first thinning region is 8% -10%, the thinning rate of the second thinning region is 5% -6.5%, and the target thinning region is the second thinning region.

5. The automobile door outer panel stamping process according to claim 4, wherein the second thinning area comprises a gap area and a transition area, the transition area is located in a peripheral area of the gap area, a stamping forming gap corresponding to the gap area is larger than a stamping forming gap corresponding to the transition area, and the target area is located in the gap area.

6. The automobile door outer panel stamping process as claimed in claim 5, wherein the width of the transition zone is 10-30 mm.

7. A stamping die obtained by applying the stamping process for the outer panel of the automobile door as claimed in any one of claims 1 to 6, comprising:

8. The stamping die of claim 7, further comprising venting structure on the female die for performing the venting step of claim 3.

9. The automobile door outer panel stamping die according to claim 8, wherein the exhaust structure includes a first groove and a second groove arranged in a cavity of the female die, the first groove extends along a length direction of the cavity of the female die, the second groove extends along a width direction of the cavity of the female die, the second groove is arranged at intervals along the length direction of the cavity of the female die, the second grooves are respectively communicated with the first groove, and a plurality of exhaust holes for communicating with an environment outside the cavity of the female die are arranged on the second groove.

10. The automobile door outer panel press mold according to claim 9, wherein the groove depth of the first groove and the second groove is 1.5 to 2.5 mm.