阅读说明：本技术 一种零件的成型模具和成型控制方法 (Part forming die and forming control method ) 是由 吕广海 黄通标 张成浩 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种零件的成型模具以及成型控制方法,其中,成型模具依次包括第一模具、第二模具和第三模具,所述第一模具、第二模具和第三模具分别对金属板材的深凸包和浅凸包进行局部特征成型、整形回压和凸包外缘剪切处理。本发明通过成型模具结构与工艺方法的结合,解决了产品翘曲和变形等平面度不佳的问题,可有效抑制成型材料的不均匀流动和切断内应力,保证生产得到的成品具有良好的平面度。(The invention discloses a part forming die and a forming control method, wherein the forming die sequentially comprises a first die, a second die and a third die, and the first die, the second die and the third die are used for performing local feature forming, shaping back pressure and convex hull outer edge shearing treatment on a deep convex hull and a shallow convex hull of a metal plate respectively. According to the invention, through the combination of the forming die structure and the process method, the problem of poor flatness such as product warping and deformation is solved, the uneven flow and the cutting internal stress of the forming material can be effectively inhibited, and the finished product obtained through production is ensured to have good flatness.)

1. The forming die of the part is characterized by comprising a first die (1), a second die (2) and a third die (3) in sequence;

the first die (1) is a local feature forming die and comprises a first punch (11) and a first lower die plate (12), wherein a first concave die plate (111) and a first lower die pressing plate (121) are respectively arranged at the joint of the first punch (11) and the first lower die plate (12); the first concave template (111) is sunken to form a first deep concave die (112) and a first shallow concave die (113) respectively, and first pressing ribs (114) are arranged on the edges of the first deep concave die (112) and the first shallow concave die (113); the first lower die pressing plate (121) protrudes upwards to form a first deep male die (122) and a first shallow male die (123), a first deep drawing rib (124) and a second deep drawing rib (125) are arranged on the outer sides of the first deep male die (122) and the first shallow male die (123), the first deep drawing rib (124) is fixed on the first lower die pressing plate (121), and the first deep drawing rib (124) and the second deep drawing rib (125) protrude out of the first lower die pressing plate (121);

the second die (2) is a shaping back-pressing die and comprises a second punch head (21) and a second lower die plate (22), and a second concave die plate (211) and a second lower die pressing plate (221) are respectively arranged at the joint of the second punch head (21) and the second lower die plate (22); the second concave die plate (211) is sunken to form a second deep concave die (212) and a second shallow concave die (213), and second pressing ribs (214) are arranged on the edges of the second deep concave die (212) and the second shallow concave die (213); the second lower die pressing plate (221) protrudes upwards to form a second deep convex die (222) and a second shallow convex die (223) respectively;

the third die (3) is a convex hull outer edge shearing die and comprises a third punch head (31) and a third lower die plate (32), and a third concave die plate (311) and a third lower die pressing plate (321) are respectively arranged at the joint of the third punch head (31) and the third lower die plate (32); the third concave mould plate (311) is sunken to form a third deep concave mould (312) and a third shallow concave mould (313); the third lower die pressing plate (321) protrudes upwards to form a third deep convex die (322) and a third shallow convex die (323).

2. The forming die according to claim 1, characterized in that in the first die (1), the first deep concave die (112) and the first shallow concave die (113) are provided with a first deep concave die stripper plate (115) and a first shallow concave die stripper plate (116), respectively, and the first beads (144) are provided on both sides of the first deep concave die stripper plate (115) and the first shallow concave die stripper plate (116).

3. The forming die according to claim 1, characterized in that in the first die (1), a first punch holder (126) is provided below the first lower die blank (121), and the first deep punch (122) and the first shallow punch (123) are respectively fixedly connected with the first punch holder (126).

4. The forming die according to claim 3, characterized in that the second draw bar (125) is arranged inside the first draw bar (124), and the second draw bar (125) is fixedly connected to the first punch holder (126).

5. The forming die according to claim 1, wherein the first bead (124) is set to have a width of 1.5-2.0mm and a depth of 0.3-0.4T; and T is the thickness of the molding material.

6. The forming die according to claim 1, characterized in that in the second die (2), a second punch retainer (224) is arranged below the second lower die material pressing plate (221), and the second deep punch (222) and the second shallow punch (223) are fixedly connected with the second punch retainer (224), respectively;

in the third die (3), a third punch retainer (324) is arranged below the third lower die pressure plate (321), and the third deep punch (322) and the third shallow punch (323) are respectively and fixedly connected with the third punch retainer (324).

7. A part forming control method is characterized in that the forming die of any one of claims 1 to 7 is adopted to perform punch forming treatment on a material, and the method specifically comprises the following steps:

s1, using the first die to perform local feature forming on a material: respectively stretching a deep convex hull and a shallow convex hull on the material, and punching small grooves on two sides of the deep convex hull and the shallow convex hull by first pressing ribs; punching a first rib and a second rib by a first deep-drawing rib and a second deep-drawing rib on the outer side of the material;

s2, shaping and back-pressing the deep convex hull and the shallow convex hull by using the second die;

and S3, performing outer edge half-shearing on the deep convex hull and the shallow convex hull by using the third die.

8. The profile control method according to claim 7, wherein in S1, when the deep convex hull is drawn, the deep convex hull forming angle α 1 is 3-5 ° larger than the angle of the finished product, and the deep convex hull forming height H11 is 0.5-0.8T larger than the height of the finished product; the radius R11 of the deep convex hull forming concave die is the same as the forming radius of the corresponding part of the finished product; the radius R12 of the deep convex hull forming convex die is larger than the forming radius of the corresponding part of the finished product, and the value is 0.5-0.8T;

when the shallow convex hull is stretched, the forming height H12 of the shallow convex hull is 0.3T greater than the height of a finished product, the chamfer of the shallow convex hull male die takes 1T, and the chamfer of the shallow convex hull female die takes 0.5T.

9. The forming control method according to claim 7, wherein in S2, when the back-pressing deep convex hull is shaped, the deep convex hull shaping angle α 2 is 1-2 ° larger than the angle of the finished product, the deep convex hull shaping height H21 is the same as the height of the finished product, the deep convex hull shaping die radius R21 is smaller than the convex hull forming die radius R11, and the deep convex hull shaping punch radius R22 is smaller than the deep convex hull forming punch radius R12;

when the back pressure shallow convex hull is shaped, the height H22 of the shallow convex hull is close to the upper limit value of the height of the finished product, the chamfer of the shallow convex hull convex die takes a value of 0.5T, and the chamfer of the shallow convex hull concave die takes a value of 0.5T.

10. The profile control method according to claim 7, wherein in the S3, at the time of half clipping the deep convex hull, the half clipping depth H31 of the deep convex hull is 1/4 to 1/3T; when the shallow convex hull is half-sheared, the half shearing depth H32 of the shallow convex hull is 1/5-1/3T.

Technical Field

The invention relates to the technical field of metal plate stamping, in particular to a part forming die and a forming control method.

Background

Large-scale metal flat plate stamping parts are used for boxes, panels and back plates of 5G communication, new energy, household appliances and electronic products. Sheet metal stamping is typically sheet metal stamping and includes a plurality of local forming features which are not uniformly distributed and which provide a low overall sheet deformation during the forming process.

For large flat plate stamping parts with complex structures, due to the influence of uneven deformation, stress distribution after forming is uneven, and the problems of deformation and poor flatness exist in the stamping forming process of box parts, specifically, bulging, warping, springback and distortion, the product quality and assembly precision of the parts are seriously influenced by the defects of the products, and the product development and manufacturing period is prolonged.

Aiming at the problems of bulging, warping, resilience and distortion of parts stamped by the local characteristic thin plates, the general solution in the prior art is to optimally design an actual die and continuously modify, trial and error and adjust the die, so that a large amount of die testing time is needed, a machine table is occupied for a long time, and resource waste is caused.

Therefore, how to develop a set of dies and processes for local forming of thin metal plate is a technical problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a part forming die and a forming control method, wherein the forming die comprises a first die, a second die and a third die which are combined together in a set, and the forming die sequentially carries out local feature forming, shaping back pressure and convex hull outer edge shearing treatment on a deep convex hull and a shallow convex hull of a metal plate, so that the uneven flowing and cutting-off internal stress of a forming material can be effectively inhibited, and the finished product obtained by production is ensured to have good flatness.

In order to achieve the purpose, the invention provides the following technical scheme:

a forming die of a part sequentially comprises a first die, a second die and a third die;

the first die is a local characteristic forming die and comprises a first punch and a first lower die plate, and a first concave die plate and a first lower die pressing plate are arranged at the joint of the first punch and the first lower die plate respectively; the first concave template is sunken to form a first deep concave die and a first shallow concave die respectively, and first pressing ribs are arranged on the edges of the first deep concave die and the first shallow concave die; the first lower die pressing material plate protrudes upwards to form a first deep convex die and a first shallow convex die respectively, a first deep drawing rib and a second deep drawing rib are arranged on the outer sides of the first deep convex die and the first shallow convex die respectively, the first deep drawing rib is fixed on the first lower die pressing material plate, and the first deep drawing rib and the second deep drawing rib protrude out of the first lower die pressing material plate;

the second die is a shaping back-pressing die and comprises a second punch and a second lower die plate, and a second concave die plate and a second lower die pressure plate are respectively arranged at the joint of the second punch and the second lower die plate; the second concave template is sunken to form a second deep concave die and a second shallow concave die, and second pressing ribs are arranged at the edges of the second deep concave die and the second shallow concave die; the second lower die material pressing plate protrudes upwards to form a second deep convex die and a second shallow convex die respectively;

the third die is a convex hull outer edge shearing die and comprises a third punch and a third lower template, and a third concave template and a third lower die pressing plate are respectively arranged at the joint of the third punch and the third lower template; the third concave template is sunken to form a third deep concave die and a third shallow concave die; and the third lower die material pressing plate protrudes upwards to form a third deep convex die and a third shallow convex die respectively.

Among the above-mentioned forming die, first mould is local characteristic forming die, adopts first drift and first lower template to carry out the punching press to material (sheet metal), produces plastic deformation, carries out the blank pressing at this in-process to through the structure adjustment inside material's of optimizing the blank pressing flow, improve material internal stress distribution, and then play the inhibitory action to kick-backing. The first die is provided with the first drawing rib and the second drawing rib, so that the material can be effectively prevented from flowing into the female die, the stretching effect of the material is improved, and particularly, the compression stress acting areas of the parts are shifted to the tensile stress area at bending angle parts which are easy to rebound.

Meanwhile, in the first die, the edges of the first deep female die and the first shallow female die are provided with first pressing ribs, the propagation path of stress waves during local feature forming is cut off by arranging the pressing ribs around the local features, the influence of the local feature forming on the whole part is reduced, and therefore warping resilience of the whole part is reduced.

The second die is a shaping back pressure die, the convex hull can generate reverse deformation through back pressure (back pressure), and further generates compressive stress on the large plane part, so that the stress is redistributed on the original basis, a part of residual tensile stress distributed on the large plane around the original convex hull is counteracted, the uneven distribution condition of the residual stress is improved, and the warping rebound is reduced.

And the third mold is a convex hull outer edge shearing mold, and the deep convex hull and the shallow convex hull of the material are respectively subjected to semi-shearing treatment to eliminate stress and ensure flatness.

Further, in the first mold, the first deep female mold and the first shallow female mold are respectively provided with a first deep female mold stripper plate and a first shallow female mold stripper plate, and the first pressing rib is arranged on two sides of the first deep female mold stripper plate and the first shallow female mold stripper plate.

As the top of the convex hull needs the female die stripper plate for pressing, the first deep concave die stripper plate and the first shallow concave die stripper plate are adopted for pressing at the initial molding stage of the deep convex hull and the shallow convex hull, so as to prevent the top surfaces of the deep convex hull and the shallow convex hull from being drum-shaped after molding. Because the concave die plate is driven by the nitrogen spring, enough material pressing force can be ensured when the first deep concave die stripper plate and the first shallow concave die stripper plate press materials.

Further, in the first die, a first male die fixing plate is arranged below the first lower die material pressing plate, and the first deep male die and the first shallow male die are respectively and fixedly connected with the first male die fixing plate.

Further, the second deep drawing rib is arranged on the inner side of the first deep drawing rib, and the second deep drawing rib is fixedly connected to the first punch fixing plate.

The first deep drawing rib and the second deep drawing rib are respectively arranged at the outer sides of the first deep convex die and the first shallow convex die, and meanwhile, the second deep drawing rib is longer than the first deep drawing rib and is closer to the first deep convex die or the first shallow convex die; the first deep drawing rib is fixed on the first lower die pressure plate, the material can be pressed to inhibit the material from flowing in the initial molding stage, and the first deep drawing rib can be bent in four sides; the second deep drawing rib is fixed on the first male die fixing plate, and the material is extruded to form a reaction force with the stretching of the convex hull at the last stage of forming, so that the internal and external tensile stress is balanced, and the flatness of the product is ensured.

Further, the width of the first ribbing is set to be 1.5-2.0mm, and the depth is set to be 0.3-0.4T; and T is the thickness of the molding material.

The first pressing rib presses the material in the molding process to prevent the outer material from flowing inwards, and the plastic and elastic stress formed by the flowing material can be eliminated.

Further, in the second die, a second male die fixing plate is arranged below the second lower die material pressing plate, and the second deep male die and the second shallow male die are respectively and fixedly connected with the second male die fixing plate;

in the third die, a third male die fixing plate is arranged below the third lower die material pressing plate, and the third deep male die and the third shallow male die are respectively and fixedly connected with the third male die fixing plate.

The invention also provides a part forming control method, which adopts the forming die to perform punch forming treatment on the material, and specifically comprises the following steps:

s1, using the first die to perform local feature forming on a material: respectively stretching a deep convex hull and a shallow convex hull on the material, and punching small grooves on two sides of the deep convex hull and the shallow convex hull by first pressing ribs; punching a first rib and a second rib by a first deep-drawing rib and a second deep-drawing rib on the outer side of the material;

s2, shaping and back-pressing the deep convex hull and the shallow convex hull by using the second die;

and S3, performing outer edge half-shearing on the deep convex hull and the shallow convex hull by using the third die.

In the forming control method, the first die is used for stamping the material, local characteristic forming is carried out, plastic deformation is generated, edge pressing is carried out in the process, the flow of the internal material is adjusted by optimizing the structure of the edge pressing, the internal stress distribution of the material is improved, the rebound inhibition effect is further played, the stretching effect of the material is increased, and particularly, the compression stress action areas of the parts are transferred to the tensile stress area at the bending angle parts which are easy to generate the rebound.

In the process of shaping and back-pressing the product by the second die, the height of the convex hull is reduced to generate reverse deformation, the large plane part generates compressive stress, and a part of residual tensile stress distributed around the convex hull in the first process S1 is offset, so that the uneven distribution condition of the residual stress is improved, and the buckling rebound is reduced.

And the third die performs outer edge half-shearing on the convex hull of the product, mainly eliminates stress and ensures the flatness of the product.

As a further description of the above part molding control method, in S1, when the deep convex hull is drawn, the deep convex hull molding angle α 1 is 3 to 5 ° greater than the angle of the finished product, and the deep convex hull molding height H11 is 0.5 to 0.8T greater than the height of the finished product; the radius R11 of the deep convex hull forming concave die is the same as the forming radius of the corresponding part of the finished product; the radius R12 of the deep convex hull forming convex die is larger than the forming radius of the corresponding part of the finished product, and the value is 0.5-0.8T;

when the shallow convex hull is stretched, the forming height H12 of the shallow convex hull is 0.3T greater than the height of a finished product, the chamfer of the shallow convex hull male die takes 1T, and the chamfer of the shallow convex hull female die takes 0.5T.

As a further description of the above molding control method, in S2, when shaping the back-pressed deep convex hull, the deep convex hull shaping angle α 2 is 1-2 ° larger than the angle of the finished product, the deep convex hull shaping height H21 is the same as the height of the finished product, the deep convex hull shaping die radius R21 is smaller than the convex hull shaping die radius R11, and the deep convex hull shaping punch radius R22 is smaller than the deep convex hull molding punch radius R12;

when the back pressure shallow convex hull is shaped, the height H22 of the shallow convex hull is close to the upper limit value of the height of the finished product, the chamfer of the shallow convex hull convex die takes a value of 0.5T, and the chamfer of the shallow convex hull concave die takes a value of 0.5T.

As a further description of the above molding control method, in S3, at the time of half shearing the deep convex hull, the half shearing depth H31 of the deep convex hull is 1/4 to 1/3T; when the shallow convex hull is half-sheared, the half shearing depth H32 of the shallow convex hull is 1/5-1/3T.

In the processes of local feature forming, shaping back pressure and convex hull outer edge semi-shearing, parameters of a forming angle, a forming height, a shaping height, a semi-shearing depth and other stamping processes are optimized and controlled, and by inhibiting material flowing and cutting off internal stress, a product with a target qualified size can be produced by stamping, so that the product is guaranteed to have good flatness.

(1) The invention provides a part forming die which comprises a first die, a second die and a third die which are combined together in a sleeving manner, wherein the deep convex hull and the shallow convex hull of a metal plate are subjected to local characteristic forming, shaping back pressure and convex hull outer edge shearing treatment in sequence, so that the uneven flowing and cutting internal stress of a forming material can be effectively inhibited, and the produced finished product has good flatness, thereby solving the problems of distortion, poor flatness, deformation and the like of a sheet metal caused by local characteristic forming.

(2) The part forming control method is combined with the forming die, and parameters of the stamping process such as a forming angle, a forming height, a reshaping height, a half-shearing depth and the like are optimized and controlled, so that qualified products meeting the target size can be efficiently produced, additional leveling and shape-righting processes are not needed, and the die testing time and the machine debugging time are saved.

Drawings

Fig. 1 is a schematic plan view of a molding die for a part according to the present invention.

Fig. 2 is a schematic plan view of a first mold of the forming mold according to the present invention.

Fig. 3 is a process flow chart of the method for controlling the molding of a part according to the present invention.

FIG. 4 is a schematic diagram of the structure of the final product after the partial feature forming process of the present invention.

Fig. 5 is a schematic structural diagram of a finished product after being processed by the shaping and back-pressure process.

FIG. 6 is a schematic structural diagram of the product after the outer edge cutting process according to the present invention.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.