阅读说明：本技术 一种汽车外覆盖件滑移线控制方法 (Automobile outer covering part sliding line control method ) 是由 张晓静 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种汽车外覆盖件滑移线控制方法,包括以下步骤：S1：在目标特征线一侧设置双拉延筋；S2：在拉延成形初始阶段,通过双拉延筋使目标特征线附近的外覆盖件主型面产生充分变形；S3：在滑移线产生的阶段,通过调整双拉延筋相对距离,使板料流出相对外侧的拉延筋,双拉延筋自动调整为单拉延筋,减小目标特征线上的板料流动,从而控制减缓改目标特征线的滑移线。本发明能够在保证产品刚性的前提下,有效减少甚至消除多特征线的滑移线问题。(The invention discloses a method for controlling the sliding line of an automobile outer covering part, which comprises the following steps: s1: arranging double draw beads on one side of the target characteristic line; s2: in the initial stage of drawing and forming, the main profile of the outer cover near the target characteristic line is fully deformed by the double draw beads; s3: and in the stage of generating the slip line, the relative distance of the double drawing beads is adjusted to enable the plate to flow out of the drawing beads on the relative outer sides, the double drawing beads are automatically adjusted into single drawing beads, the plate flowing on the target characteristic line is reduced, and the slip line for changing the target characteristic line is controlled to be slowed down. The invention can effectively reduce or even eliminate the problem of the slip lines of a plurality of characteristic lines on the premise of ensuring the rigidity of the product.)

1. A method for controlling a slip line of an automobile outer cover, characterized in that: the method comprises the following steps:

s1: arranging double draw beads on one side of the target characteristic line;

s2: in the initial stage of drawing and forming, the main profile of the outer cover near the target characteristic line is fully deformed by the double draw beads;

s3: and in the stage of generating the slip line, the relative distance of the double drawing beads is adjusted to enable the plate to flow out of the drawing beads on the relative outer sides, the double drawing beads are automatically adjusted into single drawing beads, the plate flowing on the target characteristic line is reduced, and the slip line for changing the target characteristic line is controlled to be slowed down.

2. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: the step S2 specifically includes the steps of: in the initial stage of drawing forming, the double drawing beads provide drawing resistance to the outer covering piece, and the main section surface of the outer covering piece is fully deformed before the sheet material begins to contact with the target characteristic line.

3. A method of controlling slip lines in an automotive outer cover as claimed in claim 2, wherein: the drawing resistance provided by the double-drawing rib to the outer covering part is more than two times of the drawing resistance provided by the single-drawing rib to the outer covering part.

4. A method of controlling slip lines in an automotive outer cover as claimed in claim 2, wherein: in the step S3, when the double draw bead is adjusted to the single draw bead, the total resistance coefficient of the draw resistance provided by the draw bead is reduced by one time.

5. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: in the step S3, when the sheet material flows out of the draw beads on the opposite outer sides, that is, when the sheet material starts to contact the target characteristic line and a slip line is generated, the double draw beads are adjusted to be single draw beads, and the resistance of the sheet material to flow is reduced to half of the original resistance to flow.

6. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: when the relative distance of the double draw beads is adjusted in the step S3, the draw bead close to the target characteristic line is fixed, and the relative distance between the draw bead on the outer side of the relative target characteristic line and the fixed draw bead is adjusted.

7. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: when the double draw beads are adjusted to be single draw beads in the step S3, the draw beads close to the target characteristic line are fixed, and the draw beads on the outer side of the relative target characteristic line are removed.

8. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: the outer covering comprises a side coaming, a hair cover and a fender.

9. A method of controlling slip lines in an automotive outer cover as claimed in claim 1, wherein: the outer covering part is a fender, the fender comprises a main characteristic line, a first characteristic line, a second characteristic line and a third characteristic line, the first characteristic line and the second characteristic line are sequentially arranged on one side of the main characteristic line, and the third characteristic line is arranged on the other side of the main characteristic line; the main characteristic line realizes the control of the main characteristic line sliding line by adjusting the stamping direction and balancing the brake bead resistance on the upper side and the lower side of the main characteristic line; the first characteristic line is close to the main characteristic line, and the slip line of the main characteristic line is correspondingly controlled while the slip line of the main characteristic line is controlled; the second characteristic line controls a slippage line generated by the second characteristic line through a process compensation surface raising method; the third characteristic line employs an automobile outer cover slip line control method as claimed in claim 1 to control the slip lines generated by the third characteristic line.

10. A method of controlling slip lines in an automotive outer cover as claimed in claim 9, wherein: in the initial stage of forming the third characteristic line by drawing, the double draw beads provide drawing resistance for the fender, and before the plate begins to contact the third characteristic line, the main profile of the fender is fully deformed; when the sheet material starts to contact the third characteristic line and a slip line is generated, the sheet material flows out of the drawing ribs relative to the outer side of the third characteristic line, the double drawing ribs are adjusted to be single drawing ribs, the flowing resistance of the sheet material is reduced to a half of the original flowing resistance, the flowing of the sheet material on the third characteristic line is reduced, and therefore the slip line of the third characteristic line is controlled to be slowed down.

Technical Field

The invention relates to the technical field of automobiles, in particular to a method for controlling the sliding line of an automobile outer covering part.

Background

The slip line refers to the phenomenon that when the plate passes through the convex fillet and the convex die characteristic line in the stamping forming process, the plate is bent and hardened due to positive and negative bending, and the outer surface of a manufactured part is marked, so that the phenomenon cannot be eliminated after the surface is painted. The slip lines are common surface defects of the automobile outer cover in stamping production, and the appearance of the slip lines seriously affects the surface quality and visual attractiveness of the automobile outer cover, so that the slip lines become a big problem affecting the improvement of the quality of the whole automobile.

If the surface of the outer covering piece only has one main characteristic line, the sliding of the plate on the main characteristic line can be controlled by adjusting the resistance of the conventional draw beads on the upper side and the lower side of the characteristic line, so that the aim of reducing or even eliminating the main characteristic line sliding line is fulfilled.

However, the method can only solve the control problem of the single characteristic line slip line, and the requirement of product quality control indexes, especially the hair cover, the fender and the side wall, is difficult to meet under the condition that a plurality of characteristic lines exist at the same time.

The current compromise solution is:

1) the main characteristic line is selected from a plurality of characteristic lines, and the control of the sliding lines of other characteristic lines is abandoned. The consequence of this is that, although the main characteristic line slip lines can be controlled, the rigidity of the product is also ensured, but the other characteristic line slip lines are out of control, and still serious problems of surface quality and visual aesthetics remain;

2) if an automobile factory requires that the slip line be reduced for each characteristic line, the slip lines of multiple characteristic lines can only be reduced by reducing the draw bead resistance or the blank holder force. However, the result is that the outer cover is not rigid enough, which affects the overall performance of the part and is not worth paying.

Disclosure of Invention

The invention aims to provide a method for controlling the sliding lines of an automobile outer cover, which can effectively reduce or even eliminate the problem of the sliding lines of multiple characteristic lines on the premise of ensuring the rigidity of a product.

In order to solve the technical problem, the invention provides a method for controlling the sliding line of an automobile outer cover, which comprises the following steps:

s1: arranging double draw beads on one side of the target characteristic line;

s2: in the initial stage of drawing and forming, the main profile of the outer cover near the target characteristic line is fully deformed by the double draw beads;

s3: and in the stage of generating the slip line, the relative distance of the double drawing beads is adjusted to enable the plate to flow out of the drawing beads on the relative outer sides, the double drawing beads are automatically adjusted into single drawing beads, the plate flowing on the target characteristic line is reduced, and the slip line for changing the target characteristic line is controlled to be slowed down.

As a further improvement of the present invention, the step S2 specifically includes the steps of: in the initial stage of drawing forming, the double drawing beads provide drawing resistance to the outer covering piece, and the main section surface of the outer covering piece is fully deformed before the sheet material begins to contact with the target characteristic line.

As a further improvement of the invention, the drawing resistance provided by the double-drawing rib to the outer covering part is more than twice of the drawing resistance provided by the single-drawing rib to the outer covering part.

As a further improvement of the invention, in the step S3, when the double draw bead is adjusted to be the single draw bead, the total resistance coefficient of the drawing resistance provided by the draw bead is reduced by one time.

As a further improvement of the present invention, in step S3, when the sheet material flows out of the draw beads on the opposite outer sides, that is, when the sheet material starts to contact the target characteristic line and a slip line is generated, the double draw beads are adjusted to be single draw beads, and the resistance of the sheet material to flow is reduced to half of the original flow resistance.

As a further improvement of the invention, when the relative distance of the double draw beads is adjusted in the step S3, the draw bead close to the target characteristic line is fixed, and the relative distance between the draw bead outside the relative target characteristic line and the fixed draw bead is adjusted.

As a further improvement of the invention, when the double draw bead is adjusted to be the single draw bead in the step S3, the draw bead close to the target characteristic line is fixed, and the draw bead at the outer side relative to the target characteristic line is removed.

As a further improvement of the invention, the outer cover comprises a side coaming, a hair cover and a fender.

As a further improvement of the present invention, the outer cover is a fender panel, and the fender panel includes a main characteristic line, a first characteristic line, a second characteristic line, and a third characteristic line, the first characteristic line and the second characteristic line being provided in this order on one side of the main characteristic line, the third characteristic line being provided on the other side of the main characteristic line; the main characteristic line realizes the control of the main characteristic line sliding line by adjusting the stamping direction and balancing the brake bead resistance on the upper side and the lower side of the main characteristic line; the first characteristic line is close to the main characteristic line, and the slip line of the main characteristic line is correspondingly controlled while the slip line of the main characteristic line is controlled; the second characteristic line controls a slippage line generated by the second characteristic line through a process compensation surface raising method; the third characteristic line employs an automobile outer cover slip line control method as claimed in claim 1 to control the slip lines generated by the third characteristic line.

As a further improvement of the invention, in the initial stage of forming the third characteristic line of drawing, the double drawing ribs provide drawing resistance to the fender, and before the plate material begins to contact the third characteristic line, the main profile of the fender generates full deformation; when the sheet material starts to contact the third characteristic line and a slip line is generated, the sheet material flows out of the drawing ribs relative to the outer side of the third characteristic line, the double drawing ribs are adjusted to be single drawing ribs, the flowing resistance of the sheet material is reduced to a half of the original flowing resistance, the flowing of the sheet material on the third characteristic line is reduced, and therefore the slip line of the third characteristic line is controlled to be slowed down.

The invention has the beneficial effects that: the invention provides strong drawing resistance through the double-rib at the early stage of drawing forming to realize the control of the product rigidity, namely the double-drawing rib can enable the main molded surface of the product to generate sufficient deformation as far as possible when the characteristic line of the male die at the early stage of drawing forming does not touch the characteristic line so as to ensure the rigidity control index of the main molded surface of the product; controlling the time point when the plate flows out of the outer draw bead, namely the time point when the double beads are changed into the single beads, so that the plate starts to touch the target characteristic line to generate a slip line, wherein the double beads are single beads, and the slip of the plate on the target characteristic line is reduced, thereby realizing the control of the slip line of the target characteristic line; the dynamic draw bead process control measure can overcome the shortboard of the existing slip line control process measure in the field of stamping die design, can simultaneously control the rigidity and the slip line of the multi-characteristic line covering piece, and meets the quality control requirement of the multi-characteristic line covering piece.

Drawings

FIG. 1 is a schematic elevational view of an outer cover of the present invention;

FIG. 2 is a schematic side view of an outer cover of the present invention;

FIG. 3 is a diagram showing the effect of a conventional single draw bead control state at the initial stage of draw forming;

FIG. 4 is a drawing forming initial stage, double draw bead control state effect diagram of the invention;

FIG. 5 is a diagram illustrating the effect of a conventional tendon control state during an initial stage of draw forming;

FIG. 6 is a diagram showing the effect of a conventional single draw bead control state at a slip line generation stage;

FIG. 7 is a diagram showing the effect of the change control state of the draw bead according to the present invention at the stage of generating the slip line;

FIG. 8 is a diagram illustrating the effect of a conventional tendon control state during a slip line generation phase;

FIG. 9 is a schematic structural view of a fender according to a second embodiment;

the reference numbers in the figures illustrate: 1. an outer cover; 11. a target feature line; 12. a slip line; 13. and (4) drawing ribs.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

As shown in fig. 1 and 2, the present invention provides a method for controlling a slip line of an automobile outer cover, comprising the following steps:

s1: a double draw bead 13 is arranged on one side of the target characteristic line 11;

s2: in the initial stage of the draw forming, the main profile of the outer cover 1 in the vicinity of the target characteristic line 11 is sufficiently deformed by the double draw bead 13;

s3: in the stage of generating the slip line 12, the relative distance of the double draw beads 13 is adjusted to enable the plate to flow out of the draw beads on the relative outer sides, the double draw beads 13 are automatically adjusted to be single draw beads, the plate flow on the target characteristic line 11 is reduced, and therefore the slip line 12 for changing the target characteristic line is controlled to be slowed down.

Specifically, the double ribs 13 provide a strong drawing resistance more than 2 times that of a single rib at the early stage of drawing forming, so that the control of the product rigidity is realized: because the double-drawing rib 13 can generate the resistance of a single rib which is more than 2 times, the scheme of the double-drawing rib 13 can ensure that the main molded surface of the product can generate sufficient deformation as far as possible when the characteristic line of the male die does not touch the characteristic line at the early stage of drawing forming so as to ensure the rigidity control index of the main molded surface of the product. The generation stage of the slip line 12 dynamically reduces the brake bead resistance, and the purpose of effectively controlling the slip line 12 is achieved: by adjusting the position of the outer rib, the time point when the plate flows out of the outer draw rib, namely the time point when the double ribs are changed into the single ribs, is controlled, so that the plate just becomes the single rib when the plate begins to touch the target characteristic line and the slip line 12 is generated, the flow resistance of the material is instantaneously reduced to a half of the resistance of the original double ribs, the sliding of the plate on the target characteristic line 11 is greatly reduced, and the control on the slip line 12 of the target characteristic line is realized. Through the dynamic draw bead process control measure, the short plate of the existing slip line control process measure in the field of stamping die design can be overcome, the simultaneous control of rigidity and slip lines can be realized on the multi-characteristic line covering piece, and the quality control requirement of the multi-characteristic line covering piece is met.

Example one

The embodiment of the invention provides a method for controlling the sliding lines of an automobile outer covering part, which can effectively reduce or even eliminate the problem of the sliding lines of multiple characteristic lines on the premise of ensuring the rigidity of a product. The specific implementation is as follows:

1) in the initial stage of drawing forming: the main molded surface of the outer covering part product generates sufficient deformation in the initial forming stage by utilizing the larger drawing resistance generated by the double ribs and referring to fig. 4, thereby realizing the purposes of ensuring the formability of the product and meeting the rigidity control index of the outer covering part. At this time, the drawing resistance is F_{db，dynamic1}＝F_{db inside}+F_{db outer}。

FIGS. 3-5 show a steel plateThe state at the beginning of touching the male die target characteristic line, wherein fig. 3 shows the conventional single rib state due to the small single rib resistance (F)_db＝F_{db inside}0.448), the deformation of the main section of the product is obviously insufficient; FIG. 4 shows a dynamic bead control state, in which a dynamic bead is in a double bead state at the early stage of deep drawing, which provides sufficient drawing resistance (F) for the deep drawing process_{db，dynamic1}＝F_{db inside}+F_{db outer}0.896), before the plate begins to touch the target characteristic line, the main profile of the product is fully deformed, and the rigidity control target requirement is met; FIG. 5 shows a conventional tendon control state (F)_db＝2*F_{db inside}0.896), the main profile of the product can be fully deformed, and the rigidity control target can be achieved.

2) In the stage of the generation of slip lines: the sheet material just flows out of the external draw bead, the double beads are changed into single beads, and the resistance of the draw bead is greatly reduced, so that the material flow on the target characteristic line is reduced, and the aim of reducing the slip line is fulfilled. At this time, drawing resistance F_{db，dynamic2}＝F_{db inside}。

FIGS. 6 to 8 show the drawing end stage states, in which FIG. 6 shows the conventional single rib state (F)_db＝F_{db inside}0.448), although the target characteristic line slip line is controlled, the deformation of the main profile of the product is obviously insufficient, and the rigidity of the product is influenced; FIG. 7 shows a dynamic draw bead control state, when the plate begins to touch the target characteristic line and a slip line is generated, the plate just flows through the outer bead, the double beads are changed into single beads, and the total resistance coefficient is directly reduced from 0.896 to 0.448 (F)_{db，dynamic2}＝F_{db inside}0.448), successfully controlling the slip line within 1.3 mm; FIG. 8 shows a conventional tendon control state (F)_db＝2*F_{db inside}0.896), the main section surface of the product can be ensured to be deformed fully, but the slip line exceeds 5.5mm because the drawing forming resistance is too large at the stage of the generation of the slip line. In addition, the drawn parts have also broken and the product quality is seriously impaired.

By the above implementation, the resistance (F) of the single rib can be more than 2 times generated due to the double drawing rib_{db，dynamic1}＞2*F_{db inside}) Thus, two areThe draw bead scheme can ensure that the main profile of the product is fully deformed as far as possible when the characteristic line of the male die does not touch the characteristic line in the early drawing forming stage so as to ensure the rigidity control index of the main profile of the product, when the plate begins to touch the target characteristic line and a slip line is generated, the double beads are just changed into single beads, and the material flow resistance is instantly reduced to be half of the original double-bead resistance (F)_{db，dynamic2}＝F_{db inside}) This will greatly reduce the slip of the slab on the target characteristic line, thereby achieving the control of the slip line of the target characteristic line. By the dynamic single-double draw bead control method, the slip line of the target characteristic line is reduced, and the rigidity of the product can be ensured. Therefore, the short plate which can not simultaneously take the slip line and the product rigidity control into consideration for the multi-characteristic line outer covering part by the conventional process measures in the field of stamping die design is overcome, and the product quality control requirement is met.

Example two

As shown in fig. 9, the present embodiment selects the outer cover to be a fender of a certain mass-produced type, including a typical multi-characteristic line outer cover product, and the characteristic line B is a main characteristic line, which is a characteristic line that must be strictly controlled. The main characteristic line can realize the control of the main characteristic line sliding line by a traditional sliding line control method, such as optimizing the stamping direction and balancing the resistance of the conventional draw beads at the upper side and the lower side of the main characteristic line; the characteristic line D area can control the slip lines generated by the characteristic line D by a method of raising the process compensation surface; however, the existing method for controlling the slip line of the characteristic line A has no effective measure and can only accept the slip line (i.e. abandon the control) or sacrifice the rigidity of the area, as shown in FIG. 6, so as to reduce the severity of the slip line.

In the application, in the initial stage of forming a drawing characteristic line A, the double drawing beads provide drawing resistance for the fender, and before a plate material starts to contact the characteristic line A, the main profile of the fender is fully deformed; when the plate begins to contact the characteristic line A and a slip line is generated, the plate flows out of the drawing ribs on the outer side of the relative characteristic line A according to a plan, the double drawing ribs are automatically adjusted to be single drawing ribs, the flowing resistance of the plate is reduced to a half of the original flowing resistance, the flowing of the plate on the characteristic line A is reduced, and therefore the slip line A for changing the characteristic line is controlled to be slowed down.

By the dynamic draw bead process control method, the problem of short plate control by slip lines with multiple characteristic lines is successfully solved. This vehicle model is currently on the market and successfully produces over 30 million cars. The wheel fender has not so far presented the problem of slip line quality. The defect of the traditional slip line process control method in the aspect of processing the slip lines of multiple characteristic lines is overcome, the full deformation of the product profile can be ensured, and the slip lines of the target characteristic lines can be effectively controlled.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.