CN111729978B

CN111729978B - Drawing female die, shallow drawing die, trimming die and drawing process piece

Info

Publication number: CN111729978B
Application number: CN202010442844.7A
Authority: CN
Inventors: 曹琰; 彭永前; 朱念; 任新杰; 肖航
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-07-23
Anticipated expiration: 2040-05-22
Also published as: CN111729978A

Abstract

The application relates to a drawing female die, a shallow drawing die, a trimming die and a drawing process piece, which comprise a product profile, an arc surface and a pressing plane; one end of the arc surface is connected with the product profile; the pressing plane is connected with the other end of the circular arc surface, the pressing plane is tangent to the circular arc surface at the connection position of the pressing plane and the circular arc surface, and a draw bead is arranged on the pressing plane; and the bending direction of the product profile is opposite to that of the arc surface, the arc surface is provided with a trimming boundary, the trimming boundary is close to or positioned at one end of the arc surface connected with the pressing plane, and the distance between one end of the arc surface connected with the pressing plane and the drawing bead is not smaller than a first preset value. The problem of burr, sweeps influence defects such as impression quality that the deburring angle is big, use slide wedge deburring mould to cause among the correlation technique to and the material utilization low is solved in this application.

Description

Drawing female die, shallow drawing die, trimming die and drawing process piece

Technical Field

The application relates to the technical field of stamping manufacturing, in particular to a drawing female die, a shallow drawing die, a trimming die and a drawing process piece.

Background

As shown in fig. 1, fig. 1 shows a front view of the top of a side wall part of an automobile, fig. 2 shows a cross-sectional view from a-a in fig. 1, and fig. 2 shows that the top of the side wall part of the automobile mainly comprises a side wall a, a top cover b and a reinforcing plate c, the side wall a, the top cover b and the reinforcing plate c are welded, in order to ensure the welding quality among the side wall a, the top cover b and the reinforcing plate c, high requirements are placed on the manufacturing process, and the specific manufacturing process includes three steps of drawing (as shown in fig. 3), trimming (as shown in fig. 4) and shaping (as shown in fig. 5).

In order to prevent the occurrence of defects such as wrinkles caused by uneven material flow during the forming process and impact lines caused by kinetic energy of the die on the product surface (i.e., at B in fig. 3), in some related arts, a wall-drawing process is applied to the sidewall a, and particularly, the defects stay in the process supplement regions (i.e., at C and D in fig. 3) by increasing the supplement depth of the wall-drawing process, thereby ensuring the quality of the appearance surface of the product.

However, the above-described related-art drawbacks bring new problems:

the first problem is that: referring to the cross-sectional schematic view of the drawing process part shown in fig. 3, B is a product-shaped surface region, C is a region to be shaped, and D is a waste material region, for the deep drawing process, the depth is supplemented by the deep drawing process, so that the region to be shaped C is similar to a vertical wall, the vertical drop is large, the contour curvature of the vertical wall is low, and the bottom fillet is small.

Referring to fig. 4, fig. 4 is a schematic diagram of the drawn process piece in fig. 3 after trimming, and the position of the trimming line e on the drawn process piece is determined because the edge profile of the side wall a is determined. When the deep drawing process is used, the trimming of the side wall a is carried out on the vertical wall, and the trimming angle is large because the contour curvature of the vertical wall is low and the bottom fillet is small, so the trimming can not be carried out along the stamping direction. Referring to fig. 6, in order to smoothly perform trimming, a complex tapered wedge trimming mold d must be used to change the trimming direction, which in turn leads to an increase in the size and cost of the trimming mold and an increase in difficulty in manufacturing and debugging. And because the inclined wedge trimming die does horizontal movement relative to the press when moving, the guide plate is required to be positioned, so that the inclined wedge trimming gap is difficult to ensure, the plate material can be repeatedly cut off at the joint knife with the straight trimming, burrs and scraps are generated by scraping, and if the inclined wedge trimming die falls into a die cavity, quality defects such as impression and the like can be generated.

The second problem is that: referring to fig. 3 and 5, fig. 5 is a schematic diagram of the shaped side wall a in fig. 4, for obtaining the same side wall a by stamping, because the defect cannot be caused to stay in the product-shaped surface area B, but should stay in the area C to be shaped and the waste area D, when the deep drawing process is used, the drawing depth is larger, the upper and lower drop of the area C to be shaped is larger, and because the edge profile of the side wall a is determined, the position of the trimming line e on the drawing process part is also determined, that is, the position in the area C to be shaped is determined, when the trimming is performed, the upper and lower drop of the area C to be shaped is larger, more material is generated in the area C to be shaped along with the waste area D, so that the space ratio of the portion of the sheet material shaped into the side wall a is cut off, and the utilization rate of the material of the process is low.

Disclosure of Invention

The embodiment of the application provides a drawing female die, a shallow drawing die, a trimming die and a drawing process part, and aims to solve the problems that in the related technology, the trimming angle is large, and the impression quality is affected by burrs and scraps caused by using a wedge trimming die, and the like, and the problem of low material utilization rate.

In a first aspect, there is provided a drawing die comprising:

product profile;

one end of the arc surface is connected with the product shape surface;

the pressing plane is connected with the other end of the circular arc surface, the pressing plane is tangent to the circular arc surface at the connection position of the pressing plane and the circular arc surface, and a drawing bead is arranged on the pressing plane; and the number of the first and second groups,

the bending direction of the product profile is opposite to that of the arc surface, the arc surface is provided with a trimming boundary, the trimming boundary is close to or positioned at one end of the arc surface connected with the pressing plane, and the distance between one end of the arc surface connected with the pressing plane and the drawing rib is not smaller than a first preset value.

In some embodiments, a distance between one end of the arc surface connected with the pressing plane and the trimming boundary is smaller than a second preset value.

In some embodiments, the second preset value is not greater than the first preset value.

In some embodiments, the drawing die further comprises a transition inclined surface, and the arc surface is connected with the product surface through the transition inclined surface;

the transition inclined plane is tangent to the product profile at the joint of the transition inclined plane and the product profile, and the transition inclined plane is tangent to the arc surface at the joint of the transition inclined plane and the arc surface.

In some embodiments, the length of the transition inclined plane is 5-10 mm from the product shape surface to the arc surface.

In some embodiments, the radius of the arc surface is 30-35 mm; and/or the presence of a gas in the gas,

the first preset value is 11-15 mm.

In a second aspect, there is provided a shallow drawing die comprising:

a draw die as described in any one of the above;

the drawing die comprises a drawing male die, wherein a blank holder is arranged beside the drawing male die, an integral structure formed by the drawing male die and the blank holder is arranged opposite to the drawing female die, a groove is arranged at the position, opposite to the drawing rib, of the blank holder, and a die gap between the drawing male die and the blank holder faces towards the circular arc surface.

In some embodiments, the die gap faces an end of the arc surface connected to the pressing plane.

In a third aspect, there is provided a trimming die for trimming a drawn workpiece drawn by the shallow drawing die, including:

the trimming male die is used for bearing the drawing process part;

the pressing plate is opposite to the trimming male die and is positioned above the trimming male die, and the pressing plate is used for pressing the drawing process part on the trimming male die;

the trimming knife is arranged on one side of the pressure plate, the moving direction of the trimming knife is approximately the same as the stamping direction of the shallow drawing die, and the moving path of the trimming knife passes through the position, corresponding to the trimming boundary, on the drawing process piece.

In a fourth aspect, there is provided a drawn work piece drawn using the shallow drawing die as described above.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a drawing female die, a shallow drawing die, a trimming die and a drawing process part, wherein an arc surface is tangent to a pressing plane at a connecting part, so that the surface curvature near the connecting part is small and the transition is smooth, the probability of causing an impact line is reduced, a trimming boundary on the arc surface is close to one end of the arc surface connected with the pressing plane, when the drawing process part obtained by drawing through the female die is trimmed, the trimming line corresponding to the trimming boundary on the drawing process part is close to the connecting part of the arc surface and the pressing plane, so that the trimming direction approximately faces the pressing plane, the trimming direction faces the pressing plane, the stamping direction faces the pressing plane, the trimming direction is approximately parallel to the stamping direction, the small trimming angle of the drawing process part is ensured, the trimming die does not need to use an inclined wedge trimming die with a complex structure, and the structure of the trimming die is greatly simplified, meanwhile, the defects that the impression quality is influenced by burrs and scraps caused by using the tapered wedge trimming die are avoided.

Compared with a small fillet near a to-be-shaped area C which is approximately a vertical wall in the related technology, on one hand, the arc surface on the drawing female die which is contacted with the plate material firstly is much larger, the impact force cannot be concentrated in a small area, the impact line generated in the case is slight, on the other hand, under the action of the arc surface, the plate material is bent, the stress of the bent plate material is increased, the tensile strength is increased, and the continuous deformation requires larger tensile force.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a top front view of a side wall part of a vehicle according to the related art;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a drawing process part in the related art;

FIG. 4 is a schematic view of the work piece of FIG. 3 after trimming;

FIG. 5 is a schematic view of a side wall of the drawing process part of FIG. 4 after shaping;

FIG. 6 is a schematic view of a wedge trimming die according to the related art;

FIG. 7 is a schematic drawing die provided in an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a drawn work piece provided in an embodiment of the present application;

FIG. 9 is a schematic view of an edging die provided by an embodiment of the present application;

FIG. 10 is a schematic drawing of a shallow drawing die provided in an embodiment of the present application.

In the figure: a. side walls; b. a top cover; c. a reinforcing plate; d. trimming the die by using the tapered wedge; e. trimming lines; B. a product-shaped panel zone; C. a region to be reshaped; D. a waste zone;

1. product profile; 2. a transition bevel; 3. a circular arc surface; 30. trimming the boundary; 4. pressing a material plane; 40. a draw bead; 5. drawing a male die; 6. a blank holder; 60. a groove; 61. a mold gap; 7. trimming the male die; 8. a material pressing plate; 9. and (4) trimming knives.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a drawing female die, which can solve the problems that in the related art, the trimming angle is large, and burrs and scraps caused by using a wedge trimming die influence the imprinting quality and the like, and the problem of low material utilization rate.

Referring to fig. 7, a drawing die comprises a product shape surface 1, a circular arc surface 3 and a pressing plane 4; one end of the arc surface 3 is connected with the product-shaped surface 1; the pressing plane 4 is connected with the other end of the arc surface 3, the pressing plane 4 is tangent to the arc surface 3 at the connection part, and the pressing plane 4 is provided with a draw bead 40; and the bending direction of the product profile 1 is opposite to that of the arc surface 3, the arc surface 3 is provided with a trimming boundary 30, the trimming boundary 30 is close to or positioned at one end of the arc surface 3 connected with the pressing plane 4, and the distance between one end of the arc surface 3 connected with the pressing plane 4 and the draw bead 40 is not less than a first preset value.

Referring to fig. 7, 8 and 9, in the present application, the arc surface 3 is tangent to the pressing plane 4 at the connection position, so that the surface curvature near the connection position is small and the transition is smooth, thereby reducing the probability of causing an impact line, and the trimming boundary 30 on the arc surface 3 is close to the end of the arc surface 3 connected to the pressing plane 4, when the drawing process piece obtained by drawing via the female die is trimmed, because the trimming line e corresponding to the trimming boundary 30 on the drawing process piece is close to the connection position of the arc surface 3 and the pressing plane 4, the trimming direction is approximately towards the pressing plane 4, and because the stamping direction is towards the pressing plane 4, the trimming direction is approximately parallel to the stamping direction, thereby ensuring a small trimming angle of the drawing process piece, and the trimming die does not need to use a wedge trimming die with a complex structure, thereby greatly simplifying the structure of the trimming die, and simultaneously avoiding burr, caused by using the wedge trimming die, The scraps affect the defects of impression quality and the like.

Compared with a small fillet near a region C to be reshaped, which is approximately a vertical wall in the related technology, on one hand, the arc surface 3 on the drawing female die, which is in contact with the plate first, is much larger, the impact force is not concentrated in a small region, the impact line generated in the case is slight, on the other hand, under the action of the arc surface 3, the plate is bent, the stress of the bent plate is increased, the tensile strength is increased, and the continuous deformation requires larger tensile force.

In the application, a distance L is reserved between one end of the arc surface 3 connected with the material pressing plane 4 and the draw bead 40₄₀And is for preventing the draw bead 40 from causing defects to the drawn process piece as much as possible.

In some preferred embodiments, the distance L between the end of the circular arc surface 3 connected with the pressing plane 4 and the trimming border 30₃₀The second preset value is smaller than the second preset value, and the second preset value is set according to actual needs, so that the waste materials caused by trimming can be reduced while the trimming angle is reduced, the utilization rate of the materials is improved, and the manufacturing cost of the drawing process piece is reduced. For example, the second preset value is selected from 8-12 mm.

In some preferred embodiments, the second preset value is not greater than the first preset value, and the purpose of setting the second preset value to be not greater than the first preset value is to ensure that the trimming line e of the drawing process piece corresponding to the trimming edge boundary 30 can be as close to the end, connected with the pressing plane 4, of the arc surface 3 as possible during design of the drawing die, and further ensure that the material wasted due to trimming can be reduced while the trimming angle is reduced, the utilization rate of the material is improved, and the manufacturing cost of the drawing process piece is reduced.

In some preferred embodiments, the first preset value is set to be 11-15 mm, and in some preferred embodiments, the first preset value can be selected to be 12mm empirically.

In some preferred embodiments, when one end of the arc surface 3 is directly connected with the product profile 1, the arc surface 3 is tangent to the product profile 1 at the connection position, so that the arc surface 3 and the product profile 1 are smoothly transited to avoid defects in the drawing process.

Referring to fig. 7, in some preferred embodiments, one end of the arc surface 3 and the product-shaped surface 1 may also be indirectly connected, that is: the drawing female die also comprises a transition inclined surface 2, and the arc surface 3 is connected with the product shape surface 1 through the transition inclined surface 2; the transition inclined plane 2 is tangent to the product-shaped surface 1 at the connection position, and the transition inclined plane 2 is tangent to the arc surface 3 at the connection position.

In this embodiment, the purpose of providing the transition inclined surface 2 is to ensure that, during drawing and forming, a slip line appearing in the drawing process piece corresponding to the product shape surface 1 is prevented from flowing onto the product shape surface, and the slip line is ensured to stay on the transition inclined surface 2, so as to ensure the forming quality of the drawing process piece.

In some preferred embodiments, the length of the transition inclined surface 2 is 5-10 mm from the product surface 1 to the arc surface 3, and the specific length value can be selected according to the actual design requirement.

In some preferred embodiments, the radius of the arc surface 3 is 30-35 mm, the radius of the arc surface 3 is increased to be more than 30mm, the vertical fall of a region to be shaped of a drawing process piece can be reduced, and materials cut away along with a waste material region can be reduced under the condition that a trimming line is determined, so that the proportion of a part of a plate material forming a side wall is increased, and the utilization rate of the plate material is improved.

Meanwhile, the trimming angle of the trimming line can be adjusted by controlling the radius of the arc surface 3.

Referring to fig. 7 and 10, an embodiment of the present application further provides a shallow drawing die, which includes a drawing female die and a drawing male die 5, a blank holder 6 is disposed beside the drawing male die 5, an integral structure formed by the drawing male die 5 and the blank holder 6 is disposed opposite to the drawing female die, a groove 60 is disposed on the blank holder 6 at a position opposite to the draw bead 40, and a die gap 61 between the drawing male die 5 and the blank holder 6 faces the arc surface 3.

The drawing process piece formed by drawing with the shallow drawing die provided by the embodiment has the advantage of small trimming angle as shown in fig. 8, when trimming, the straight trimming die can be used for trimming, the trimming direction is approximately the same as the moving direction of the straight trimming die, the defects that the impression quality is influenced by burrs and scraps caused by the use of the wedge trimming die are avoided, and the product quality is ensured.

In some preferred embodiments, the die gap 61 is toward the end of the circular arc surface 3 that connects with the nip plane 4.

Referring to fig. 9, an embodiment of the present application further provides a trimming die, which is used for trimming a drawing process piece drawn by the shallow drawing die, and includes a trimming punch 7, a pressure plate 8 and a trimming knife 9, where the trimming punch 7 is used for bearing the drawing process piece; the pressure plate 8 is arranged opposite to the trimming convex die 7 and is positioned above the trimming convex die 7, and the pressure plate 8 is used for pressing the drawing process part on the trimming convex die 7; the trimming knife 9 is arranged at one side of the pressure plate 8, the moving direction of the trimming knife 9 is approximately the same as the stamping direction of the shallow drawing die, and the moving path of the trimming knife 9 passes through the position, corresponding to the trimming boundary 30, on the drawing process piece.

Compared with the tapered wedge trimming die, the trimming die provided by the embodiment belongs to a straight trimming die, is simple in structure, avoids the defects that the stamping quality is influenced by burrs and scraps caused by the use of the tapered wedge trimming die because the moving direction of the trimming knife 9 is approximately the same as the stamping direction of a shallow drawing die, and ensures the quality of products.

The embodiment of the application also provides a drawing working procedure piece which is drawn by using the shallow drawing die.

The principle of the application is as follows:

In the application, a distance L is reserved between one end of the arc surface 3 connected with the material pressing plane 4 and the draw bead 40₄₀The draw beads 40 can be prevented from causing defects to the drawn process piece.

The transition inclined plane 2 is tangent to the product-shaped surface 1 at the connection position, and the transition inclined plane 2 is tangent to the arc surface 3 at the connection position. Through the transition inclined plane 2, the phenomenon that a slip line appears in the drawing process piece corresponding to the product profile 1 can be avoided during drawing and forming, and the forming quality of the drawing process piece is ensured.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drawing die, characterized in that it comprises:

a product shape surface (1);

one end of the arc surface (3) is connected with the product-shaped surface (1); the radius of the arc surface (3) is 30-35 mm;

the pressing plane (4) is connected with the other end of the arc surface (3), the pressing plane (4) is tangent to the arc surface (3) at the connection position of the pressing plane (4) and the arc surface, and a draw bead (40) is arranged on the pressing plane (4); and the number of the first and second groups,

the bending direction of the product profile (1) is opposite to that of the arc surface (3), a trimming boundary (30) is arranged on the arc surface (3), the trimming boundary (30) is close to or located at one end, connected with the pressing plane (4), of the arc surface (3), the distance between one end, connected with the pressing plane (4), of the arc surface (3) and the drawing rib (40) is not smaller than a first preset value, and the first preset value is 11-15 mm;

the distance between one end of the arc surface (3) connected with the pressing plane (4) and the trimming boundary (30) is smaller than a second preset value;

the second preset value is not greater than the first preset value.

2. The drawing die of claim 1, wherein:

the drawing female die also comprises a transition inclined surface (2), and the arc surface (3) is connected with the product profile (1) through the transition inclined surface (2);

the transition inclined plane (2) is tangent to the product profile (1) at the connection position, and the transition inclined plane (2) is tangent to the arc surface (3) at the connection position.

3. The drawing die of claim 2, wherein: from product profile (1) to arc surface (3) direction, the length of transition inclined plane (2) is 5~10 mm.

4. A shallow drawing die, comprising:

a drawing die according to any one of claims 1 to 3;

the drawing die comprises a drawing male die (5), a blank holder (6) is arranged beside the drawing male die (5), an integral structure formed by the drawing male die (5) and the blank holder (6) is arranged opposite to the drawing female die, a groove (60) is arranged on the blank holder (6) at a position opposite to the draw bead (40), and a die gap (61) between the drawing male die (5) and the blank holder (6) faces the arc surface (3).

5. A shallow drawing die according to claim 4, wherein: the die gap (61) faces towards one end of the arc surface (3) connected with the pressing plane (4).

6. A drawn work piece drawn using the shallow drawing die of claim 4 or 5.