CN116441442A - Composite edge wrapping process - Google Patents

Abstract

The invention relates to the technical field of vehicle manufacturing, in particular to a composite edge-wrapping process, and aims to solve the problem that the existing edge-wrapping process cannot achieve the consideration of the process quality, the process efficiency and the process cost of an engine cover. For this purpose, the composite edging process of the invention comprises the following steps: s10, buckling a first sheet metal part and a second sheet metal part with a flanging; s20, performing pre-edging treatment on the flanging of the second sheet metal part so as to adjust the flanging of the second sheet metal part to a first preset angle; s30, performing die edging on the first sheet metal part and the second sheet metal part subjected to the pre-edging treatment, and pressing the flanging of the second sheet metal part on the first sheet metal part. The composite edge-wrapping technology mixes the two edge-wrapping modes of pre-rolling and die edge-wrapping, ensures the quality and stability of the final edge-wrapping process while not affecting high-beat production, and reduces the technology cost.

Description

Composite edge wrapping process

Technical Field

The invention relates to the technical field of vehicle manufacturing, and particularly provides a composite edging process.

Background

The edge wrapping generally refers to the connection of two metal plates (mainly the assembly of the inner plate and the outer plate of the door cover type opening and closing piece) in a mode that the flanging of one part wraps the periphery of the other part. For example: hood, fender, door, etc.

The common engine cover edge-wrapping technology comprises a robot edge-rolling technology, a die edge-wrapping technology and the like. However, since the engine cover has a large shape, in order to ensure normal buckling between the inner and outer plates, the flanging angle is often greater than 115 degrees, but when the flanging angle exceeds 115 degrees, the engine cover is not wrapped easily when being directly wrapped by a die, and an assembly with qualified quality cannot be manufactured.

Although the robot edging is adopted to make the assembly with qualified quality, however, because the engine hood edging area is larger, the common robot edging cannot guarantee high beats and has low production efficiency, the process planning of the robot edging alone for the production line with high flexibility and high beats is relatively complex, the single edging island planning cannot meet the high beats, the investment required by the double edging island planning is larger, the occupied process area is larger, and great cost and space waste are caused. Therefore, when the flanging angle exceeds 115 degrees, how to consider the process quality, the process efficiency and the process cost is a problem to be solved in the field.

Disclosure of Invention

The invention aims to solve the technical problems, namely the problem that the existing edge wrapping process cannot achieve the process quality, the process efficiency and the process cost of the engine cover, and is urgent to be solved in the field.

According to a first aspect of the present invention, a composite hemming process is disclosed comprising the steps of: s10, buckling a first sheet metal part and a second sheet metal part with a flanging; s20, performing pre-edging treatment on the flanging of the second sheet metal part so as to adjust the flanging of the second sheet metal part to a first preset angle; s30, carrying out die edging on the first sheet metal part and the second sheet metal part subjected to the pre-edging treatment, and pressing the flanging of the second sheet metal part on the first sheet metal part.

Further, before the step S10, the method further includes the following steps: s00, acquiring a flanging angle of the second sheet metal part; in the step S20, the method further includes the steps of: s21, comparing whether the flanging angle of the second sheet metal part exceeds a second preset angle; s22, selectively performing pre-edging treatment on the second sheet metal part according to the comparison result, wherein the first preset angle is smaller than the second preset angle.

Further, the step S22 further includes the steps of: s221, if the flanging angle of the second sheet metal part is smaller than a second preset angle, directly adjusting the flanging of the second sheet metal part to the first preset angle through one-time pre-edging treatment; s222, if the flanging angle of the second sheet metal part is more than or equal to a second preset angle, firstly adjusting the flanging of the second sheet metal part to be between the first preset angle and the second preset angle through one-time pre-flanging treatment, and then adjusting the flanging of the second sheet metal part to be at the first preset angle through the second pre-flanging treatment.

Further, in the step S20, the value range of the first preset angle is 100 ° to 115 °.

Further, in the step S20, the value range of the second preset angle is 130 ° to 150 °.

Further, in step S30, the following steps are further included: s31, adjusting the flanging of the second sheet metal part to a third preset angle through a pre-pushing knife of a press taping device, wherein the third preset angle is smaller than the first preset angle; s32, pressing the flanging of the second sheet metal part on the first sheet metal part through a positive pressure knife of the press taping device to finish taping.

Further, the value range of the third preset angle is 40-45 degrees.

Further, the first sheet metal part is an inner plate of the engine cover, and the second sheet metal part is an outer plate of the engine cover.

Further, in the step S10, the first sheet metal part and the second sheet metal part complete fastening at the splicing table.

Further, in the step S20, a robot hemming method is adopted to perform a pre-hemming process on the flange of the second sheet metal part.

The composite edge-wrapping process combines the pre-rolling and the die edge-wrapping, firstly, the angle of the flanging is adjusted to a first preset angle through the pre-rolling step, and then the die edge-wrapping is carried out. The two binding modes of pre-binding and die binding are mixed for use, so that the problem of poor quality of binding of a single press caused by overlarge flanging angle of a local area when a sheet metal part is bound is solved, meanwhile, the pre-binding can be completed in a short time due to smaller angle of the pre-binding, the quality and stability of a final binding process are guaranteed while high-beat production is not influenced, and the process cost is reduced.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a process flow diagram of a composite hemming process of an embodiment of the present invention;

FIG. 2 is a diagram of a flanging process for a second sheet metal part in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of the construction of a pre-hemming device of an embodiment of the present invention;

FIG. 4 is a schematic view of the structure of a press hemming device of an embodiment of the present invention;

list of reference numerals:

10. a first sheet metal part; 20. a second sheet metal part; 21. flanging; 30. a pre-binding device; 31. an inner plate positioning device; 32. a bag Bian Taimo; 33. a binding robot; 40. a press hemming device; 41. a press; 42. an upper die holder; 43. and (5) a lower die holder.

Detailed Description

The invention is further illustrated by the following examples, but the scope of the invention is not limited to the description.

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, but do not indicate or imply that the apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

As shown in fig. 1 and 2, the invention discloses a composite edge-wrapping process, which comprises the following steps:

s10, buckling a first sheet metal part 10 and a second sheet metal part 20 with a flanging 21;

s20, performing pre-edging treatment on the flanging 21 of the second sheet metal part 20 so as to adjust the flanging 21 of the second sheet metal part 20 to a first preset angle;

s30, performing die edging on the first sheet metal part 10 and the second sheet metal part 20 subjected to the pre-edging treatment, and pressing the flanging 21 of the second sheet metal part 20 on the first sheet metal part 10.

The composite edge-covering process adopts the combination of pre-rolling and die edge-covering, the angle of the flanging 21 is adjusted to a first preset angle through the pre-rolling step, and then the die edge-covering is carried out. The two binding modes of pre-binding and die binding are mixed for use, so that the problem of poor binding quality of a single press 41 caused by overlarge angle of a local area flanging 21 when a sheet metal part is bound is solved, meanwhile, the pre-rolling can be completed in a very short time due to smaller angle of the pre-binding, the quality and stability of the final binding process are ensured while high-beat production is not influenced, and the process cost is reduced.

The following describes the above embodiment specifically with reference to an engine hood as an example:

the first sheet metal part 10 is an inner panel of the engine hood, and the second sheet metal part 20 is an outer panel of the engine hood.

In step S10, the inner plate of the engine hood is required to be carried by the robot gripper and placed on the split platform to be buckled with the outer plate of the split platform, after the buckling, the robot gripper suction cup adsorbs the outer plate to keep the relative positions of the inner plate and the outer plate, and then the split piece is placed on the robot pre-hemming station as shown in fig. 2.

As shown in fig. 2 and 3, a pre-hemming device is provided at a robot pre-hemming station, and includes an inner panel positioning device 31, a hemming tire membrane 32, and a hemming robot 33. The inner plate positioning device 31 is used for positioning the inner plate and comprises an inner plate positioning pin and an inner plate flange edge positioning cutter block. The bead filler 32 is used for positioning the outer plate, and comprises a tire mold surface and an outer plate fine positioning guide. The binding head is integrated by 1 or more rollers and binding pressure devices and used for binding control, and the driving device is used for driving the binding head to bind.

In step S20, after the inner plate and the outer plate are assembled and spliced, the inner plate and the outer plate are carried from the assembling station to the machine edging station by a robot gripper and placed on the edging tire film 32, the edging tire film 32 positions the outer plate through the molded surface and peripheral outer plate positioning devices, the bag Bian Taimo is provided with a sucker, the sucker sucks the outer plate tightly, then the robot gripper moves out, the inner plate positioning device 31 clamps, and the positions of the inner plate are positioned through a positioning pin and a material pressing plate, so that the relative positions and stability of the inner plate and the outer plate are ensured. After the positioning is finished, the edge rolling robot 33 performs pre-rolling along the area to be rolled according to the edge rolling track through rollers, and pre-rolls the angle of the flanging 21 to a first preset angle (the position is adjusted from the position I to the position II in fig. 2), wherein the value range of the first preset angle is 100-115 degrees.

As shown in fig. 4, the press hemming device 40 includes a press 41, an upper die holder 42, a lower die holder 43, a press core, a pre-push knife, a final hemming unit, a tire membrane, and a lifting mechanism. The press 41 is in driving connection with the upper die holder 42 and is used for controlling the lifting of the upper die and the output of pressure. The upper die holder 42 is used for fixing a pressing core and a final pressing tool, an inner plate locating pin and a pressing plate are arranged on the upper die holder 42 and used for correcting and guaranteeing the position of an inner plate, a pre-pushing tool is arranged on the lower die holder 43 and used for pre-pushing the flanging 21 on the outer edge, wherein the pre-pushing tool comprises an inclined wedge mechanism, a spring and a pushing tool block, and a pushing tool guide block is arranged on the inclined wedge mechanism; the lower die holder 43 is used for fixing the pre-folding unit and the lifting mechanism, and the tire membrane is arranged on the lower die holder 43; the pressing core is an inner plate positioning unit and is used for positioning an inner plate and comprises an inner plate positioning pin, a pressing plate (an inner plate flange edge positioning cutter block), a pressing claw, a guide block and the like. The pre-flanging unit is used for controlling the pre-wrapping angle and comprises a pre-flanging driving block (an insert and a pullback mechanism) and a pre-flanging cutter block. And the final edge wrapping unit is used for controlling the final edge wrapping thickness and the edge wrapping gap. The fetal membrane is an outer plate positioning unit and is used for positioning the outer plate and comprises a fetal membrane molded surface and an outer plate fine positioning guide. The lifting mechanism is a lifting unit of the assembly and is used for descending the assembly of the inner plate and the outer plate and lifting the inner plate, so that the robot can conveniently grasp and put parts.

In step S30, the pre-rolled inner and outer splice members are placed by the transfer robot from the robot edging station onto the lifting mechanism of the press hemming device 40, after being placed in place, the robot is moved out, the lifting mechanism is lowered, and simultaneously the pre-rolled splice members are placed into the tire membrane on the lower die holder 43, the parts are positioned by the tire membrane profile and the tire membrane periphery fine positioning guide, the outer plates are sucked by the sucking disc in the tire membrane, and the outer plates are prevented from moving. And then the press 41 drives the upper die holder 42 to press downwards, and the inner plate positioning pin of the upper die holder 42 corrects the position of the inner plate in the pressing process, and the material pressing plate on the upper die holder 42 presses the inner plate edge-covering area, so that the relative position of the inner plate and the outer plate is ensured.

Then, a pre-pushing step S31 is performed, in step S31, the upper die holder 42 continues to be pressed down, a guide block of the upper die holder 42 applies a certain force to the inclined wedge mechanism, so that the inclined wedge mechanism moves, the moving inclined wedge mechanism drives the push-type knife block to move, the push-type knife block completes the pre-pushing of the flanging 21 angle according to a certain sequence through mechanical movement, and the flanging 21 angle is pre-pushed to a third preset angle (from the position II to the position III in fig. 2), wherein the third preset angle range is 40-45 °.

With continued depression of the upper die holder 42, the wedge is actuated and returns to its original position under the force of the mechanical spring to complete the pre-pushing. Then, a final pressing step S32 is performed, in the step S32, after the pre-pushing is completed, a positive pressure knife is pressed onto the pre-pushed flange 21, a certain force is applied, the press fit of the flange 21 is finally completed, after the upper die holder 42 is kept for a period of time, the upper die holder returns to the initial position under the action of the press 41, the sucking disc of the tire membrane blows, the lifting mechanism drives the front cover after the edge wrapping is completed to lift, and finally, the robot gripper takes a part from the press 41 and conveys the part to a lower part working position, so that the engine cover edge wrapping assembly is completed.

It should be noted that, because the engine hood is of a large variety, after some outer edges are punched and formed, the flanging 21 angle is larger than the second preset angle, and the value range of the second preset angle is 130 ° to 150 °, in this case, the flanging 21 angle cannot be adjusted to the first preset angle by performing one-time pre-edging, so that a large number of bad products are easily caused.

In order to improve the pre-rolling efficiency, in step S20, the flange 21 of the second sheet metal member 20 is pre-rolled by a robot rolling method. For example, the robot with sectional type at two sides can be added simultaneously for pre-rolling edge so as to ensure enough pre-rolling flexibility, adapt to various engine hood products, finish pre-rolling in a short time, and ensure the quality and stability of the final edge wrapping process while not affecting high-beat production.

In order to avoid the above problem, before step S10, the following steps are further included:

s00, acquiring the flanging 21 angle of the second sheet metal part 20;

in step S20, the method further includes the steps of:

s21, comparing whether the flanging 21 angle of the second sheet metal part 20 exceeds a second preset angle; and S22, selectively performing pre-edging treatment on the second sheet metal part 20 according to the comparison result, wherein the first preset angle is smaller than the second preset angle.

Further, step S22 further includes the steps of:

s221, if the flanging 21 angle of the second sheet metal part 20 is smaller than the second preset angle, directly adjusting the flanging 21 of the second sheet metal part 20 to the first preset angle through one-time pre-edging treatment;

s222, if the flanging 21 angle of the second sheet metal part 20 is more than or equal to a second preset angle, the flanging 21 of the second sheet metal part 20 is adjusted to be between the first preset angle and the second preset angle through one-time pre-edging treatment, and then the flanging 21 of the sheet metal part is adjusted to be at the first preset angle through the second pre-edging treatment.

Through measuring the turn-ups 21 angle of second sheet metal component 20, can judge the number of times of carrying out the edge rolling in advance according to the initial turn-ups 21 angle size of second sheet metal component 20, if the angle is too big, then carry out the adjustment of edge rolling in advance twice, if the angle is less, then carry out the edge rolling in advance once can to guarantee the yields.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (10)

1. The composite edge covering process is characterized by comprising the following steps of:

s10, buckling a first sheet metal part (10) and a second sheet metal part (20) with a flanging (21);

s20, performing pre-edging treatment on the flanging (21) of the second sheet metal part (20) so as to adjust the flanging (21) of the second sheet metal part (20) to a first preset angle;

s30, performing die edging on the first sheet metal part (10) and the second sheet metal part (20) subjected to the pre-edging treatment, and pressing the flanging (21) of the second sheet metal part (20) on the first sheet metal part (10).

2. The composite hemming process according to claim 1, further comprising, before the step S10, the steps of:

s00, acquiring the flanging (21) angle of the second sheet metal part (20);

in the step S20, the method further includes the steps of:

s21, comparing whether the flanging (21) angle of the second sheet metal part (20) exceeds a second preset angle;

s22, selectively performing pre-edging treatment on the second sheet metal part (20) according to the comparison result, wherein the first preset angle is smaller than the second preset angle.

3. The composite hemming process of claim 2 wherein step S22 further includes the steps of:

s221, if the angle of the flanging (21) of the second sheet metal part (20) is smaller than a second preset angle, directly adjusting the flanging (21) of the second sheet metal part (20) to the first preset angle through one-time pre-edging treatment;

s222, if the angle of the flanging (21) of the second sheet metal part (20) is more than or equal to a second preset angle, firstly adjusting the flanging (21) of the second sheet metal part (20) to a position between the first preset angle and the second preset angle through one-time pre-flanging, and then adjusting the flanging (21) of the second sheet metal part (20) to the first preset angle through the second pre-flanging.

4. The composite hemming process of claim 1 wherein,

in the step S20, the value range of the first preset angle is 100 ° to 115 °.

5. The composite hemming process of claim 2 wherein,

in the step S20, the value range of the second preset angle is 130 ° to 150 °.

6. The composite hemming process of claim 1 further comprising the step of, in step S30:

s31, adjusting the flanging (21) of the second sheet metal part (20) to a third preset angle through a pre-pushing knife of a press taping device (40), wherein the third preset angle is smaller than the first preset angle;

s32, pressing the flanging (21) of the second sheet metal part (20) on the first sheet metal part (10) through a positive pressure knife of the press edge covering device (40) to finish edge covering.

7. The composite hemming process of claim 6 wherein,

the value range of the third preset angle is 40-45 degrees.

8. The composite hemming process of claim 1 wherein,

the first sheet metal part (10) is an inner plate of the engine cover, and the second sheet metal part (20) is an outer plate of the engine cover.

9. The composite hemming process of claim 1 wherein,

in the step S10, the first sheet metal part (10) and the second sheet metal part (20) are buckled at a splicing table.

10. The composite hemming process of claim 1 wherein,

in the step S20, a plurality of robot hemming methods are used to perform a pre-hemming process on the flange (21) of the second sheet metal part (20).