CN117463878A - Thick plate forming method based on blank local reinforcement - Google Patents

Abstract

The invention belongs to the technical field of forming processing of thick plate workpieces, and discloses a thick plate forming method based on blank local reinforcement, wherein a first blank is designed according to a workpiece to be processed, and one end of the first blank is a wrinkling area; enlarging the outline of the wrinkling area to obtain a second blank containing the first blank, and marking the boundary line of the first blank on the second blank; bending the second blank along the boundary line of the first blank and forming a bending part; stamping and forming the bent second blank to obtain a primary workpiece; and (3) trimming and punching the primary product to obtain a final product. According to the invention, the rigidity of the local area of the second blank can be improved through bending treatment, so that the tendency of buckling caused by compressive instability in the plane of the first blank can be resisted, the effects of greatly reducing or eliminating the buckling and the multiple materials are achieved, and the reduction of the investment of production tools and the cost amortization are facilitated.

Description

Thick plate forming method based on blank local reinforcement

Technical Field

The invention relates to the technical field of forming processing of thick plate workpieces, in particular to a thick plate forming method based on blank local reinforcement.

Background

The heavy plate part of the commercial vehicle frame and cab assembly is taken as an important part of the load bearing of the frame and cab, and the reliability of the whole vehicle is particularly important. At present, a thick plate workpiece is basically made of 4-10mm thick workpieces in the commercial vehicle industry, and the yield strength of the materials is different from 350Mpa to 700 Mpa. The thick plate parts such as longitudinal beams, cross beams and connecting plates of the traditional commercial vehicle are simple in structure, basically U-shaped or L-shaped, materials in the forming process are stable and controllable, and quality problems of wrinkling are avoided. However, due to the requirements of product structure and strength, some new integrated stamping cross beams and cab suspension parts have complex structures, the end parts have structural characteristics of combination of plane and curved surfaces, and the flatness of the end part connecting area is required to be not more than 0.5mm in the assembly relation so as to strictly ensure the reliability of the connecting torque with the frame assembly. Because of the particularity of the thick plate stamping process, a drawing process is hardly adopted, firstly, the air cushion pressure of equipment is insufficient, and secondly, the problem of drawing cracking caused by large deformation resistance of the material pressing part is solved, so that the thick plate stamping is generally carried out by adopting a traditional stamping forming process. However, for the traditional stamping forming process, the biggest problems are that materials are more materials and the wrinkling is caused, and the connecting area of the thick plate is uneven, so that the loosening of the bolt in the using process of a vehicle is caused, and therefore, how to adopt the stamping forming process and ensure the forming quality of the complex thick plate part at the same time is a key technology for expanding the application of the thick plate part on a commercial vehicle.

Disclosure of Invention

The invention aims to provide a thick plate forming method based on blank local reinforcement, which aims to solve the problems of multiple materials and wrinkling existing in the traditional thick plate stamping forming process.

To achieve the purpose, the invention adopts the following technical scheme:

the thick plate forming method based on the blank local reinforcement comprises the following steps:

s1, designing a first blank according to a workpiece to be processed, wherein one end of the first blank is a wrinkling area;

s2, expanding the outline of the wrinkling area to obtain a second blank, and marking the boundary line of the first blank on the second blank;

s3, bending the second blank along the boundary of the first blank to form a bending part;

s4, stamping and forming the bent second blank to obtain a primary workpiece;

s5, trimming and punching the primary product to obtain a final product.

Optionally, in step S3, bending the second blank to obtain a bending portion, where the length of the bending portion is greater than the thickness of the first blank.

Optionally, the bending portion and the creasing region are located on the same side of the dividing line of the first blank.

Optionally, the bending portion is disposed along a direction of compressive stress of the crumpling region.

Optionally, a transition part is arranged between the crinkling area and the boundary line of the first blank, and a smooth transition bending angle is formed between the transition part and the bending part.

Optionally, the bending part is in a V shape, a W shape, a Z shape or a U shape.

Optionally, the second blank is provided with a pressing rib, and the pressing rib is arranged at the bending part and the transition part and can bend synchronously along with the bending part.

Optionally, the bead is a plate or a strip, and the bead is welded to the bending portion.

Optionally, the contour expansion in step S2 is specifically: and extending one end, provided with the wrinkling area, of the first blank along the direction away from the other end of the first blank, and forming the second blank by the extended part and the first blank.

Optionally, step S2 further includes machining the second blank by laser or blanking and punching to obtain the desired shape and size.

The invention has the beneficial effects that:

according to the thick plate forming method based on the blank local reinforcement, the corrugated area on the first blank is identified and the outline is enlarged, the second blank is bent along the boundary of the first blank, and the bending part is formed after bending, so that the rigidity of the local area of the second blank can be improved, the tendency of buckling caused by compressive instability in the plane of the first blank can be resisted, and the effects of greatly reducing or eliminating the wrinkling and the multiple materials are achieved. Compared with the traditional thick plate part forming scheme, the method increases the local outline of the wrinkling area on the first blank, strengthens the shape and bending deformation of the wrinkling area with wrinkling risk, removes redundant blank materials through a trimming procedure after the primary part is formed, and finally enables the outline size and the form and position tolerance of the final part product to meet the requirements. According to the technical scheme, the possible cracking risk of the blank holder drawing process and the requirement of providing larger blank holder force for stamping equipment are avoided, the pre-reinforcement before stamping is performed in a bending mode, a die is not required to be added separately, and the investment of production tools and the cost amortization are reduced.

Drawings

FIG. 1 is a schematic view of a web unwind profile of a first blank in a blank-based localized reinforcement thick sheet forming method of the present invention;

FIG. 2 is a schematic view of a web unwind profile of a second blank in a blank-based localized reinforcement thick sheet forming method according to the present invention;

FIG. 3 is a schematic diagram of a structure of a second blank after bending in the blank-based locally reinforced thick plate forming method according to the present invention;

fig. 4 is a schematic structural view of a primary product obtained by the thick plate forming method based on blank local reinforcement.

In the figure:

1. a first blank; 11. a crumpled area;

2. a second blank; 21. a dividing line; 22. a bending part; 23. a transition section;

3. a primary product; 31. a connection plane.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment of the invention provides a thick plate forming method based on blank local reinforcement, which comprises the following steps:

s1, designing a first blank 1 according to a workpiece to be processed, wherein one end of the first blank 1 is a wrinkling area 11, as shown in figure 1;

s2, expanding the outline of the wrinkling area 11 to obtain a second blank 2, and marking a dividing line 21 of the first blank 1 on the second blank 2, as shown in fig. 2; a laser or blanking punch is used to obtain the second blank 2 of the desired shape and size.

S3, bending the second blank 2 along the dividing line 21 of the first blank 1 to form a bending part 22, as shown in FIG. 3;

s4, stamping the bent second blank 2 to obtain a primary workpiece 3, wherein as shown in FIG. 4, a wrinkling area 11 is a connecting plane 31 of the primary workpiece 3;

s5, trimming and punching the primary product 3 to obtain a final product.

The trimming treatment aims to remove the part with the enlarged profile in the step S2, and the trimming modes comprise laser processing, die trimming and the like.

According to the thick plate forming method based on the blank local reinforcement, the corrugated area 11 on the first blank 1 is identified and the outline is enlarged, the second blank 2 is bent along the dividing line 21 of the first blank 1, the bending part 22 is formed after bending, the rigidity of the local area of the second blank 2 can be improved through bending, the tendency of buckling caused by compressive instability in the plane of the first blank 1 can be resisted, and the effects of greatly reducing or eliminating the wrinkling and the multiple materials are achieved. Compared with the traditional thick plate workpiece forming scheme, the method increases the local outline of the wrinkling area 11 on the first blank 1, increases the shape and bending deformation of the wrinkling area 11 with wrinkling risk, removes redundant blank materials through the trimming process after the primary workpiece 3 is formed, and finally enables the outline size and the form and position tolerance of the final workpiece product to meet the requirements. According to the technical scheme, the possible cracking risk of the blank holder drawing process and the requirement of providing larger blank holder force for stamping equipment are avoided, the pre-reinforcement before stamping is performed in a bending mode, a die is not required to be added separately, and the investment of production tools and the cost amortization are reduced.

The thick plate forming method based on the blank local reinforcement is suitable for stamping forming of thick plate pieces with the thickness of 4-10mm, is suitable for processing thick plate parts for commercial vehicles, and is beneficial to ensuring the product quality and the assembly quality of the thick plate parts.

Optionally, in step S3, the second blank 2 is bent to obtain a bent portion 22, where the length of the bent portion 22 is greater than the thickness of the first blank 1.

It will be appreciated that, in order to meet the requirement of the bending process, such as the bending die spacing, the length of the bending portion 22 is designed to be greater than the thickness of the first blank 1, and generally, the length of the bending portion 22 in the direction from one end to the other end of the first blank 1 is not less than twice the thickness of the board, which is beneficial for bending. The length of the bent portion 22 is an extension length of the second blank 2 in the direction of the major axis of the first blank 1 from the creasing region 11 to the parting line 21 of the first blank 1.

Optionally, the fold 22 is located on the same side of the dividing line 21 of the first blank 1 as the crumpling zone 11.

As shown in fig. 3 and 4, the first blank 1 is used to form a final product, and the connection plane 31 on the final product is the crumpled area 11 on the first blank 1, as a plane structure for connection, and crumpled deformation easily occurs in the plane structure during connection, thus corresponding to the crumpled area 11 in the embodiment of the present invention. The invention sets the bending direction of the bending part 22 corresponding to the stamping forming direction of the crumpling area 11 by identifying and demarcating the crumpling area 11 in advance so as to meet the reinforcing effect of the first blank 1 in the forming process.

It is further preferred that the bending portion 22 is provided in the direction of the compressive stress of the crumpling zone 11. As shown in fig. 4, after the first blank 1 is processed into the primary product 3 or the final product, the bending portion 22 is disposed along the direction of the compressive stress in the normal direction of the connection plane 31, so as to strengthen the rigidity of the area near the wrinkling area 11, and the strengthened rigidity is beneficial to inhibiting wrinkling during press forming, thereby preventing the first blank 1 from locally wrinkling, and ensuring that the flatness of the connection plane 31 of the primary product 3 is within the range of the dimensional requirement.

Optionally, a transition portion 23 is provided between the creasing region 11 and the dividing line 21 of the first blank 1, and a rounded corner a is formed between the transition portion 23 and the bending portion 22.

As shown in fig. 3, the transition portion 23 is essentially a part of the extended outline of the crumpling area 11, before the second blank 2 is bent, the parting line 21 of the first blank 1 on the second blank 2 is set within an extended outline range with a certain width from the crumpling area 11, so that the range of the first blank 1 can not be occupied by structural dimensions in the bending process, the transition portion 23 is more beneficial to bending the bending portion 22 at any angle, as shown in fig. 3, the bending angle a is a 90-degree arc transition angle, and the bending portion 22 and the crumpling area 11 are mutually perpendicular, so that the best rigidity enhancement effect is achieved.

Optionally, the bending portion 22 is V-shaped, W-shaped, Z-shaped or U-shaped, and fig. 3 is a schematic view of V-shaped bending. The cross-sectional shape of the bending part 22 is designed according to the wrinkling trend, when the wrinkling trend is larger, the bending number is increased, the bending step depth needs to be ensured to meet the processing requirement, the bending part 22 does not influence the subsequent forming process, and the waste is beneficial to cutting and sliding.

Optionally, the second blank 2 is provided with a rib, and the rib is provided on the bending portion 22 and the transition portion 23, and can be bent synchronously with the bending portion 22.

The bending process can increase the rigidity of the first blank 1 near the crumpling zone 11, thereby serving to avoid crumpling. The rib is arranged in the area with the enlarged outline during bending, and the rib is bent along with the rib during bending to form the reinforced transition part 23 and the bending part 22, so that a better reinforcing effect is achieved.

In this embodiment, the bending process uses a bending machine.

Alternatively, the bead is a plate or bar, and the bead is welded to the bent portion 22 and the transition portion 23.

Optionally, referring to fig. 1 to 3, in step S2, the corrugated area 11 is contoured, specifically: the first blank 1 is extended at one end thereof provided with the corrugation zone 11 in a direction away from the other end of the first blank 1, the extended portion and the first blank 1 constituting the second blank 2.

Optionally, in step S2, the second blank 2 is processed by laser or blanking and punching to obtain the required shape and size, so that after the second blank 2 is bent and punched, the primary product 3 with the required size is obtained, and the primary product 3 is trimmed and punched to obtain the final product.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The thick plate forming method based on the blank local reinforcement is characterized by comprising the following steps of:

s1, designing a first blank (1) according to a workpiece to be processed, wherein one end of the first blank (1) is a wrinkling area (11);

s2, enlarging the outline of the wrinkling area (11) to obtain a second blank (2) containing a first blank (1), and marking a dividing line (21) of the first blank (1) on the second blank (2);

s3, bending the second blank (2) along a dividing line (21) of the first blank (1) to form a bending part (22);

s4, stamping and forming the bent second blank (2) to obtain a primary product (3);

s5, trimming and punching the primary manufactured part (3) to obtain a final manufactured part product.

2. The thick plate forming method based on blank local reinforcement according to claim 1, characterized in that the length of the bending portion (22) is greater than the thickness of the first blank (1).

3. A thick plate forming method based on localized reinforcement of blanks according to claim 2, characterized in that the bending portion (22) is located on the same side of the dividing line (21) of the first blank (1) as the crumpling zone (11).

4. A thick plate forming method based on blank local strengthening according to claim 3, characterized in that the bending portion (22) is arranged in the direction of the compressive stress of the crumpling zone (11).

5. A thick plate forming method based on blank local reinforcement according to claim 3, characterized in that a transition part (23) is provided between the crumpling zone (11) and the dividing line (21) of the first blank (1), and a smoothly transiting bending angle is formed between the transition part (23) and the bending part (22).

6. The thick plate forming method based on blank local reinforcement according to claim 2, characterized in that the bending portion (22) is V-shaped, W-shaped, Z-shaped or U-shaped.

7. The thick plate forming method based on blank local reinforcement according to claim 5, characterized in that the second blank (2) is provided with a bead which is provided at the bending portion (22) and the transition portion (23) and can be bent synchronously with the bending portion (22).

8. The blank-based localized reinforcement thick plate forming method of claim 7, wherein the bead is a plate or bar, and the bead is welded to the bent portion (22).

9. The thick plate forming method based on blank local reinforcement according to claim 1, wherein the contour expansion in step S2 is specifically: extending one end of the first blank (1) provided with the wrinkling region (11) along the direction away from the other end of the first blank (1), and forming the second blank (2) by the extended part and the first blank (1).

10. The thick plate forming method based on the blank local reinforcement according to claim 9, characterized in that step S2 further comprises machining the second blank (2) by means of laser or blanking punching to obtain the desired shape and size.