Method of controlling surface waviness in a reverse draw area of a stamped outer panel

Abstract

The application discloses a method for controlling surface wave of a stamping cover outer plate reverse-drawing forming area, which comprises position control of effective line round of the reverse-drawing forming area of a process piece; after the first surface of the process piece is centered in a forming die, the first surface of the reverse-drawing forming area of the process piece is forcibly corrected in a bulging state, the forming die convex model surface is first reduced, then the forming die pressure material surface is correspondingly compensated; when the first surface of the reverse-drawing forming area of the process piece is in the bulging state, the forming die pressure material surface corresponding to the reverse-drawing forming area of the process piece is finally matched and researched at high speed for production verification. The application takes the accurate process piece position as a prerequisite, and correspondingly reduces the forming die convex model surface and correspondingly compensates the forming die pressure material surface, so that the forming die pressure material matching state can be controlled and high-speed production verification can be realized, thereby effectively and stably solving the surface wave problem of the stamping cover outer plate reverse-drawing forming area.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle engineering, in particular to a method for controlling surface waves of a reverse-drawing forming area of a stamping outer panel. BACKGROUND

[0002] With the continuous development of the automobile industry, the original method for controlling surface waves of a reverse-drawing forming area of a stamping outer panel in the industry is that a pre-designer controls the feeding of a drawing die for the stamping outer panel, increases the forming thinning state of the reverse-drawing forming area of the stamping outer panel to improve the forming rigidity, and thus relieves the surface wave trend of the reverse-drawing forming area of the stamping outer panel. A post-adjuster takes the convex model surface of a lower die of a forming die for the stamping outer panel as a reference, does not optimize the convex model surface of the lower die of the forming die, and then controls the forming state by matching the pressure material surface of an upper die of the forming die, so as to optimize the wave state. In the two methods, neither the feeding control by the pre-designer nor the matching control by the post-adjuster has a great effect on the optimization of the surface wave defect of the reverse-drawing forming area of the stamping outer panel, and the surface wave problem of the reverse-drawing forming area of the outer panel cannot be completely eliminated. SUMMARY

[0003] In view of the above problems, the present application provides a method for controlling surface waves of a reverse-drawing forming area of a stamping outer panel, which comprises the following steps:

[0004] The technical scheme of the present application is as follows: a method for controlling surface waves of a reverse-drawing forming area of a stamping outer panel, comprising the following steps:

[0005] S1: positioning the corner fillet of a workpiece and determining the position of the workpiece in a forming die;

[0006] S2: correcting the first face bulging state of the reverse-drawing forming area of the workpiece;

[0007] S3: matching the pressure material surface of an upper die of the forming die with the convex model surface of a lower die of the forming die;

[0008] S4 high-speed production verification.

[0009] Further, the positioning process piece edge line fillet step is as follows:

[0010] S101 Under the premise of process piece stability, use the process piece first face positioning reference hole to determine the centering position of the process piece in the forming mold;

[0011] S102 After the process piece is centered in the forming mold, determine whether the edge line fillet form of the process piece reverse concave forming area conforms to the edge line fillet surface of the lower mold reverse concave forming area of the forming mold;

[0012] S103 If the surface conforms, continue S2; if the surface does not conform, supplement the edge line fillet surface of the lower mold reverse concave forming area of the forming mold and repeat steps S101 to S102 until the surface conforms.

[0013] Further, the specific steps for correcting the bulging state of the first face of the process piece reverse concave forming area are as follows:

[0014] S201 Perform decrement correction and fairing on the forming convex model surface of the lower mold reverse concave forming area of the forming mold;

[0015] S202 Perform increment compensation and fairing on the material pressing surface of the upper mold corresponding to the lower mold position of the forming mold;

[0016] S203 Experimental piece verification;

[0017] S204 If the bulging state of the first face of the process piece reverse concave forming area has not been eliminated, repeat steps S201 to S203 until the bulging state of the first face of the process piece reverse concave forming area is eliminated; if the bulging state of the first face of the process piece reverse concave forming area is eliminated, continue S3.

[0018] Further, the specific steps for matching the material pressing surface of the upper mold and the convex model surface of the lower mold of the forming mold are as follows:

[0019] S301 After the bulging state of the first face of the process piece reverse concave forming area is eliminated, match the material pressing surface of the upper mold and the convex model surface of the lower mold of the forming mold corresponding to the process piece reverse concave forming area;

[0020] S302 Experimental piece verification;

[0021] S303 If the elimination of the bulging state of the first face of the process piece reverse concave forming area is unstable, repeat steps S301-S302 until the elimination of the bulging state of the first face of the process piece reverse concave forming area is stable; if the elimination of the bulging state of the first face of the process piece reverse concave forming area is stable, continue step S4.

[0022] Further, the specific steps for high-speed production verification are as follows:

[0023] S401 production frequency of 12 times / min is verified by sending out the workpiece;

[0024] S402 if the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the production frequency of 14 times / min is verified by sending out the workpiece;

[0025] S403 if the first surface bulging state of the reverse-drawing forming area of the workpiece is not eliminated, the workpiece with the stable first surface state is used to complete the die face grinding of the upper die of the forming die, and then the steps S401-S402 are repeated until the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated; if the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the operation is ended.

[0026] The present application has the following beneficial effects:

[0027] The present application provides a method for controlling the surface wave of the reverse-drawing forming area of the outer plate of a stamping cover, which comprises controlling the position of the fillet of the reverse-drawing forming area of the workpiece; after the workpiece is positioned in the forming die, the first surface bulging state of the reverse-drawing forming area of the workpiece is forcibly corrected, the amount of the convex model surface of the forming die is first corrected, and then the amount of the die face of the forming die is compensated; when the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the die face of the forming die corresponding to the reverse-drawing forming area of the workpiece is ground, and finally the high-speed production is verified. The die face of the forming die controls the reverse-drawing forming area of the workpiece, eliminates the uneven phenomenon of the first surface caused by the springback after the reverse-drawing forming area of the outer plate of the stamping cover is formed, effectively controls the surface wave state of the reverse-drawing forming area of the outer plate of the stamping cover, and improves the high-speed production stability of the reverse-drawing surface of the outer plate of the stamping cover. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The present application provides a method for controlling the surface wave of the reverse-drawing forming area of the outer plate of a stamping cover, which comprises controlling the position of the fillet of the reverse-drawing forming area of the workpiece; after the workpiece is positioned in the forming die, the first surface bulging state of the reverse-drawing forming area of the workpiece is forcibly corrected, the amount of the convex model surface of the forming die is first corrected, and then the amount of the die face of the forming die is compensated; when the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the die face of the forming die corresponding to the reverse-drawing forming area of the workpiece is ground, and finally the high-speed production is verified. The die face of the forming die controls the reverse-drawing forming area of the workpiece, eliminates the uneven phenomenon of the first surface caused by the springback after the reverse-drawing forming area of the outer plate of the stamping cover is formed, effectively controls the surface wave state of the reverse-drawing forming area of the outer plate of the stamping cover, and improves the high-speed production stability of the reverse-drawing surface of the outer plate of the stamping cover.

[0029] Figure 2 The present application provides a method for controlling the surface wave of the reverse-drawing forming area of the outer plate of a stamping cover, which comprises controlling the position of the fillet of the reverse-drawing forming area of the workpiece; after the workpiece is positioned in the forming die, the first surface bulging state of the reverse-drawing forming area of the workpiece is forcibly corrected, the amount of the convex model surface of the forming die is first corrected, and then the amount of the die face of the forming die is compensated; when the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the die face of the forming die corresponding to the reverse-drawing forming area of the workpiece is ground, and finally the high-speed production is verified. The die face of the forming die controls the reverse-drawing forming area of the workpiece, eliminates the uneven phenomenon of the first surface caused by the springback after the reverse-drawing forming area of the outer plate of the stamping cover is formed, effectively controls the surface wave state of the reverse-drawing forming area of the outer plate of the stamping cover, and improves the high-speed production stability of the reverse-drawing surface of the outer plate of the stamping cover.

[0030] Figure 3 The present application provides a method for controlling the surface wave of the reverse-drawing forming area of the outer plate of a stamping cover, which comprises controlling the position of the fillet of the reverse-drawing forming area of the workpiece; after the workpiece is positioned in the forming die, the first surface bulging state of the reverse-drawing forming area of the workpiece is forcibly corrected, the amount of the convex model surface of the forming die is first corrected, and then the amount of the die face of the forming die is compensated; when the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the die face of the forming die corresponding to the reverse-drawing forming area of the workpiece is ground, and finally the high-speed production is verified. The die face of the forming die controls the reverse-drawing forming area of the workpiece, eliminates the uneven phenomenon of the first surface caused by the springback after the reverse-drawing forming area of the outer plate of the stamping cover is formed, effectively controls the surface wave state of the reverse-drawing forming area of the outer plate of the stamping cover, and improves the high-speed production stability of the reverse-drawing surface of the outer plate of the stamping cover.

[0031] Figure 4 The present application provides a method for controlling the surface wave of the reverse-drawing forming area of the outer plate of a stamping cover, which comprises controlling the position of the fillet of the reverse-drawing forming area of the workpiece; after the workpiece is positioned in the forming die, the first surface bulging state of the reverse-drawing forming area of the workpiece is forcibly corrected, the amount of the convex model surface of the forming die is first corrected, and then the amount of the die face of the forming die is compensated; when the first surface bulging state of the reverse-drawing forming area of the workpiece is eliminated, the die face of the forming die corresponding to the reverse-drawing forming area of the workpiece is ground, and finally the high-speed production is verified. The die face of the forming die controls the reverse-drawing forming area of the workpiece, eliminates the uneven phenomenon of the first surface caused by the springback after the reverse-drawing forming area of the outer plate of the stamping cover is formed, effectively controls the surface wave state of the reverse-drawing forming area of the outer plate of the stamping cover, and improves the high-speed production stability of the reverse-drawing surface of the outer plate of the stamping cover.

[0032] In the drawings:

[0033] 1 - Process piece reverse concave forming area first face bulging state; 2 - Forming die convex model surface; 3 - Convex model surface reduction correction; 4 - Forming die pressure material surface; 5 - Pressure material surface increment compensation; A - Process piece reverse concave forming area edge round first face; B - Forming die reverse concave forming area edge round surface; C - Process piece reverse concave forming area first face bulging state elimination; D - Forming die reverse concave forming area edge round surface repair welding; L - Process piece; S - Forming die upper die; T - Forming die lower die. DETAILED DESCRIPTION

[0034] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" and the like should be understood broadly, for example, "fixed" can be fixed connection, or detachable connection, or integral; connection can be mechanical connection, or electrical connection; connection can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] A method for controlling the surface waves of the reverse concave forming area of a stamping cover outer plate, the specific steps are as follows:

[0037] Step one, control the positioning state of the edge round of the reverse concave forming area of the process piece, so as to control the centering position of the process piece in the forming die;

[0038] Step two, correct the first face bulging state of the reverse concave forming area of the process piece, first correct the reduction of the convex model surface of the lower die of the forming die, then correspondingly compensate the increment of the pressure material surface of the upper die of the forming die, and verify whether the first face bulging state of the reverse concave forming area of the process piece is eliminated by producing test pieces;

[0039] Step three, after the first face bulging state of the reverse concave forming area of the process piece is eliminated, the pressure material surface of the upper die of the forming die is subjected to the type research and integration (the type research and integration of the first face of the process piece and the die surface);

[0040] Step four, finally verify the high-speed production of the stamping production line;

[0041] Preferably, the positioning state control effective for the corner rounding of the anti-die region ridge line is as follows:

[0042] Step one, under the premise of part stability, use CH hole (punching part first face positioning reference hole) to determine the centering position of the process part in the forming die;

[0043] Step two, after the process part is centered in the forming die, determine the anti-die forming region ridge line corner rounding first face of the process part and the anti-die forming region ridge line corner rounding surface of the forming die;

[0044] The confirmation of the effective positioning state of the anti-die forming region ridge line corner rounding first face of the process part and the anti-die forming region ridge line corner rounding surface of the forming die requires a process part with a stable first face state to determine the position;

[0045] If the effective positioning state of the anti-die forming region ridge line corner rounding first face of the process part and the anti-die forming region ridge line corner rounding surface of the forming die is invalid, the anti-die forming region ridge line corner rounding surface of the forming die needs to be repaired and the anti-die forming region ridge line corner rounding first face of the process part needs to be re-ground until the effective positioning state of the anti-die forming region ridge line corner rounding first face of the process part and the anti-die forming region ridge line corner rounding surface of the forming die is stable;

[0046] If the effective positioning state of the anti-die forming region ridge line corner rounding first face of the process part and the anti-die forming region ridge line corner rounding surface of the forming die is reasonable, proceed to the next step;

[0047] Preferably, the forced correction of the first face bulging state of the process part anti-die forming region is as follows:

[0048] Step one, after the process part is centered in the forming die, the forming convex model surface of the lower die anti-die forming region of the forming die is modified by reducing the amount;

[0049] Step two, after the forming convex model surface of the lower die anti-die forming region of the forming die is modified and smoothed, the corresponding forming die upper die pressure material surface is compensated by increasing the amount;

[0050] Step three, after the corresponding forming die upper die pressure material surface of the forming convex die of the lower die anti-die forming region of the forming die is compensated by increasing the amount, the surface is smoothed and modified;

[0051] Step four, after the corresponding forming die upper die pressure material surface of the forming convex die of the lower die anti-die forming region of the forming die is smoothed and modified, the experimental part is verified;

[0052] The confirmation of the first face bulging state of the process part anti-die forming region requires a process part with a stable first face state to complete the experiment;

[0053] If the first surface of the process piece is not eliminated, the above steps one / two / three / four need to be repeated until the first surface of the process piece is eliminated;

[0054] If the first surface of the process piece is eliminated, the next step is performed;

[0055] Preferably, the molding die corresponding to the reverse concave forming area of the process piece is pressed against the material surface to perform the matching research.

[0056] Step one, after the first surface of the process piece is eliminated, the molding die corresponding to the reverse concave forming area of the process piece is pressed against the material surface to perform the matching research.

[0057] Step two, after the molding die corresponding to the reverse concave forming area of the process piece is pressed against the material surface to perform the matching research, the experimental piece is verified.

[0058] If the first surface of the process piece is not eliminated, the above steps one / two / three / four need to be repeated until the first surface of the process piece is eliminated;

[0059] If the first surface of the process piece is not eliminated, the above steps one / two / three / four need to be repeated until the first surface of the process piece is eliminated;

[0060] If the first surface of the process piece is eliminated, the next step is performed;

[0061] Preferably, the high-speed production verification is performed as follows:

[0062] Step one, after the first surface of the process piece is eliminated, the molding die corresponding to the reverse concave forming area of the process piece is pressed against the material surface to perform the matching research.

[0063] Step two, after the molding die corresponding to the reverse concave forming area of the process piece is pressed against the material surface to perform the matching research, the experimental piece is verified.

[0064] If the first surface of the process piece is not eliminated, the above steps one / two / three / four need to be repeated until the first surface of the process piece is eliminated;

[0065] If the first surface of the process piece is eliminated, the next step is performed;

[0066] The working principle and use process of the present application are as follows:

[0067] As Figure 1 , Figure 2 , Figure 3 ,Figure 4As shown, under the premise of a reasonable process part L, and considering the formability trend of the theoretical design, the first surface state of the process part is stabilized. While ensuring reasonable process control according to the theoretical design, the mold is optimized. The optimization approach is to first effectively control the alignment and positioning of the first surface of the rounded corner of the reverse concave forming area of ​​the process part with the rounded corner of the reverse concave forming area of ​​the forming mold. This controls the centering position of the process part L in the forming mold. With the first surface state of the process part L stable, the CH hole is used to determine the centering position of the process part L in the mold. After the centering position of the process part L in the forming mold is accurate, the positioning and alignment state of the first surface of the rounded corner of the reverse concave forming area of ​​the process part is determined. When confirming the effective alignment and positioning, a stable workpiece L is used to determine the centering position. If the alignment and positioning fails, the rounded corner surface of the reverse concave forming area of ​​the forming mold needs to be repaired by welding D, and the workpiece L needs to be aligned and lapped until the alignment and positioning are stable. If the alignment and positioning is reasonable, it means that the first surface of the reverse concave forming area of ​​the workpiece is accurately aligned with the surface of the reverse concave forming area of ​​the forming mold. The bulging state 1 of the first surface of the reverse concave forming area of ​​the workpiece can be forcibly corrected. First, the surface reduction correction 3 is performed on the forming convex model surface 2 of the reverse concave forming area of ​​the lower mold T of the forming mold. The correction of the forming convex model surface 2 of the reverse concave forming area of ​​the lower mold T of the forming mold is smooth. Afterwards, the upper mold S of the corresponding forming mold, the pressing surface 4 of the forming mold, undergoes incremental compensation 5. The upper mold S of the forming mold, corresponding to the pressing surface 4 of the forming mold in the concave forming area 2 of the forming mold, is smoothed after incremental compensation 5. After smoothing correction, the upper mold S of the forming mold, corresponding to the pressing surface 4 of the forming mold in the concave forming area 2 of the forming mold, is produced for experimental verification. When confirming the bulging state 1 of the first surface of the concave forming area of ​​the process part L, the process part L with a stable first surface state is used to complete the experiment. If the bulging state 1 of the first surface of the concave forming area of ​​the process part is not eliminated, the above forced correction process for the bulging state 1 of the first surface of the concave forming area of ​​the process part needs to be repeated until the experimental part... The bulging state of the first surface of the reverse concave forming area of ​​the experimental part is eliminated (C). If the bulging state of the first surface of the reverse concave forming area of ​​the experimental part is eliminated (C), the upper mold S of the forming mold and the pressing surface 4 of the forming mold in the reverse concave forming area can be aligned and fitted. After the forming mold is aligned and fitted, the experimental part is produced for verification. When the bulging state 1 of the first surface of the reverse concave forming area of ​​the experimental part L is confirmed to be stable, the experimental part L with a stable first surface state is used to complete the experiment. If the elimination of the bulging state C of the first surface of the reverse concave forming area of ​​the experimental part is unstable, the alignment and fitting of the upper mold S of the forming mold and the pressing surface 4 of the forming mold in the reverse concave forming area of ​​the experimental part needs to be repeated until the elimination of the bulging state C of the first surface of the reverse concave forming area of ​​the experimental part is stable.If the first surface of the reverse concave forming area of the process piece is eliminated C stable in the bulging state, the stamping high-speed production verification can be carried out, and the production frequency of 12 times / min is verified. After the first surface of the reverse concave forming area of the process piece is eliminated C stable in the bulging state, the production frequency of 14 times / min is verified. If the first surface of the reverse concave forming area of the process piece is eliminated C unstable in the bulging state, the first surface stable process piece L is used to complete the die S forming die pressure material surface 4 research and development on the forming die upper die until the first surface of the reverse concave forming area of the process piece is eliminated C stable in the bulging state. If the first surface of the reverse concave forming area of the process piece is eliminated C stable in the bulging state, the work is ended. The present application takes the accurate process piece centering position as the premise, and specifically corrects the forming die lower die convex model surface and the forming die upper die pressure material surface, controls the pressure material type state, and verifies the high-speed stamping production, so that the surface wave problem of the reverse concave forming area of the stamping cover piece outer plate can be effectively and stably solved.

[0068] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0069] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any modification, equivalent replacement and improvement made by those skilled in the art within the technical range disclosed in the present application, as long as it is within the spirit and principle of the present application, should be covered within the protection scope of the present application. Meanwhile, the contents not described in detail in the specification are all prior art known by those skilled in the art.

[0070] It should be noted that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

Claims

1. A method for controlling surface wave in the concave forming area of ​​a stamped cover plate, characterized in that, include S1 positions the edge radius of the workpiece to determine its position in the forming mold. S2 corrects the bulging state of the first surface of the reverse concave forming area of ​​the workpiece; The upper die pressing surface and the lower die convex surface of the S3 forming mold are aligned and lapped together. S4 high-speed production verification; Step S1 includes: Under the premise that the S101 process part is stable, the positioning reference hole on the first surface of the process part is used to determine the centering position of the process part in the forming mold. After the S102 process part is aligned in the forming mold, determine whether the shape of the rounded corner of the edge line of the reverse concave forming area of ​​the process part matches the shape of the rounded corner of the edge line of the reverse concave forming area of ​​the lower mold of the forming mold. If the surface conforms to the design in step S103, continue with step S2; if the surface does not conform to the design, weld the filleted edges of the concave forming area of ​​the lower mold of the forming mold and repeat steps S101 to S102 until the surface conforms to the design. Step S2 includes: S201 reduces the amount of material on the convex mold surface in the concave forming area of ​​the lower mold of the forming die, and smooths it; S202 performs incremental compensation on the pressing surface of the upper die corresponding to the lower die position of the forming mold, and smooths it; S203 provides experimental verification; S204 If the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is not eliminated, repeat steps S201 to S203 until the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is eliminated; if the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is eliminated, continue to S3. Step S3 includes: After the bulging state of the first surface of the reverse concave forming area of ​​the S301 process part is eliminated, the upper die pressing surface and the lower die convex surface of the forming mold corresponding to the reverse concave forming area of ​​the process part are aligned and lapped together. S302 provides experimental specimen verification; S303 If the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is unstable, repeat steps S301-S302 until the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is stable; if the bulging state of the first surface of the reverse concave forming area of ​​the workpiece is stable, continue to step S4. Step S4 includes: S401 is produced for verification at a frequency of 12 times / minute. S402 If the bulging state of the first surface of the anti-concave forming area of ​​all process parts in S401 is eliminated, then a production frequency of 14 times / min is used for part verification. S403 If the first surface bulging state of the reverse concave forming area of ​​a workpiece in S402 has not been eliminated, then use a workpiece with a stable first surface state to complete the grinding of the molded material surface on the forming mold on the production line. Then repeat steps S401-S402 until the first surface bulging state of the reverse concave forming area of ​​all workpieces is eliminated; if the first surface bulging state of the reverse concave forming area of ​​the workpiece is eliminated, then the operation ends.

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