Plate turning bracket forming process and continuous die

Abstract

The application discloses a plate turning bracket forming process and a continuous die, and comprises the following steps: S1, die releasing; at least two plate blanks are released from the die in one continuous layout to form a first state product; S2, first-time bending; a second state product with a first bending edge and a second bending edge is formed; S3, correction; the flatness of the first bending edge and the second bending edge on the second state product and the perpendicularity of the first bending edge and the second bending edge to the corresponding retaining edges are corrected; S4, punching a circular hole; a circular hole is punched on the first bending edge and the second bending edge after the correction in the step S3 to form a third state product; S5, punching a waist-shaped hole; a waist-shaped hole is punched on the retaining edge to form a fourth state product; S6, second-time bending; a fifth state product with a first U-shaped bending and a second U-shaped bending is formed. The application can effectively reduce the rejection rate in the product forming process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile and rail vehicle parts processing, in particular to a plate turning bracket forming process and a continuous die. BACKGROUND

[0002] The overall frame of the structural forming part applied to the automobile turning system is close to U-shaped, please refer to Figure 2 and Figure 3 , in the production and manufacturing process, the perpendicularity of the A surface and the D surface, the parallelism of the C surface and the D surface and the perpendicularity of the C surface and the B surface are important control parts in the whole production and manufacturing. If the perpendicularity of the A surface and the D surface cannot be guaranteed in the production and manufacturing, the change of the three row position tolerances will greatly affect other dimensions of the turning bracket part, thereby affecting the qualified rate of the turning bracket part.

[0003] The above structure is relatively complex, in the production and manufacturing process, different punches are needed to punch the sample die for multiple times, and the turning bracket product has high requirements on the perpendicularity, parallelism and position of the hole, and because the plate is thick, in order to guarantee the perpendicularity and parallelism of the product, the hole needs to be punched first and then the material is cut, and if there is a slight deviation, the whole part cannot be used, resulting in a high unqualified rate.

[0004] Therefore, in order to meet the requirements of part size and precision, the existing stamping die needs a cross beam for positioning and guiding, and each process corresponds to a station on the die, and the direction and position of each sample die need to be the same to guarantee the precision of the product, therefore the conventional stamping process can only use the cross beam with one hole in one die, as shown in Figure 1 .

[0005] The above stamping process is found to have the following problems through actual research:

[0006] 1. The material carrying point is placed on the cross beam, the connecting rib is relatively narrow, and the single side near the connecting rib is stressed during forming, the material is unevenly stressed, which will cause the product to twist and the size to be unstable, thereby increasing the unqualified rate of the product, that is, the high scrap rate, if the size of the defective product flows to the customer and is installed in the car, it is very likely to cause abnormal turning function of the automobile, causing unnecessary personal injury to the driver and passengers.

[0007] 2. The conventional stamping process needs to punch the material multiple times except the connecting rib in the production process, and can only adopt the beam strip material and one-hole arrangement mode; the beam drives the sample mold to the next operation (the beam also plays a role of positioning and guiding in the subsequent process); the one-hole arrangement mode: each process corresponds to a station on the mold, so the direction and position of each sample mold must be the same to ensure the accuracy of the product; the beam strip material and one-hole arrangement mode of the conventional stamping process have low material utilization rate, resulting in high product unit price and high production cost.

[0008] 3. According to the conventional process, because the shape and structure of the product are complex, the sample mold is punched out at one time, which may cause deformation or high damage degree of the product; therefore, the sample mold needs to be punched multiple times, and then subsequent bending, punching and forming processes are carried out, all processes are completed on one mold, the mold press equipment has large tonnage and workbench, occupies large space, the operation process is complicated, and the production time is long.

[0009] 4. The mold used in the existing process can only be used for manufacturing a specific steering bracket, and has speciality, and cannot be used for producing other parts, increasing the production cost. SUMMARY

[0010] The first object of the present application is to provide a plate steering bracket forming process to reduce the rejection rate in the product forming process.

[0011] The second object of the present application is to provide a plate steering bracket forming continuous mold to reduce the rejection rate in the product forming process.

[0012] The plate steering bracket forming process of the present application is realized as follows:

[0013] A plate steering bracket forming process, comprising:

[0014] Step S1: mold stripping; at least two plate blanks are punched out at one time to form a first state product;

[0015] Step S2: first bending; the first bending edge line of the first state product is bent to form a second state product with a first bending edge and a second bending edge;

[0016] Step S3: correction; the flatness of the first bending edge and the second bending edge of the second state product and the perpendicularity of the first bending edge and the second bending edge to the corresponding retaining edge are corrected;

[0017] Step S4: punching a circular hole; punching a circular hole on the first bending edge and the second bending edge after the correction in step S3 to form a third state product;

[0018] Step S5: punching a waist-shaped hole; punching a waist-shaped hole on the holding edge to form a fourth state product;

[0019] Step S6: second bending; bending the preset U-shaped bending line on the fourth state product to form a fifth state product with a first U-shaped bending and a second U-shaped bending; wherein

[0020] Step S1, step S2 and step S3 are sequentially performed, and step S4, step S5 and step S6 are not in sequence after step S3.

[0021] In an optional embodiment of the present application, step S4, step S5 and step S6 are sequentially performed.

[0022] In an optional embodiment of the present application, the step S1 includes:

[0023] Step S11: continuous layout; the two plate blanks are arranged in a slope to form an intermediate auxiliary material connection;

[0024] Step S12: cutting; cutting the auxiliary material between the two plate blanks arranged in a continuous layout to form two separate first state products.

[0025] In an optional embodiment of the present application, the two plate blanks in step S11 are arranged back to back; and

[0026] The back surfaces of the two plate blanks are distributed with arc protrusions staggered.

[0027] In an optional embodiment of the present application, the step S2 adopts a pressure plate and a bending lower die which are both profiled structures to form the first bending edge and the second bending edge.

[0028] In an optional embodiment of the present application, the step S2 further includes bending the H edge at the same time of forming the first bending edge and the second bending edge.

[0029] In an optional embodiment of the present application, the step S3 adopts an up-down stamping correction device to correct the flatness of the first bending edge and the second bending edge; and

[0030] The up-down stamping correction device includes an upper die correction unit and a lower die correction unit used in cooperation; the upper die correction unit and the lower die correction unit are respectively adapted to abut against the upper and lower end surfaces of the first bending edge and the second bending edge.

[0031] In an alternative embodiment of the present application, the upper die correcting unit and the lower die correcting unit each comprise a plurality of area correcting blocks arranged in an array.

[0032] In an alternative embodiment of the present application, the lower die correcting unit cooperates with the movable slide to clamp and limit the holding edges corresponding to the first bending edge and the second bending edge respectively.

[0033] The plate turning bracket forming continuous die of the present application is realized as follows:

[0034] A plate turning bracket forming continuous die for a plate turning bracket forming process, comprising:

[0035] The first bending punch and the correcting punch are arranged in sequence, and the circular hole punch, the waist hole punch and the second bending punch are arranged in no particular sequence behind the correcting punch.

[0036] Compared with the prior art, the plate turning bracket forming process and the continuous die of the present application can form at least two plate blanks into first state products at one time, and the two first state products are connected by auxiliary materials. Such layout can fully utilize the waste materials in the products, improve the utilization rate of the overall material strip, and thus reduce the comprehensive cost of the formed products.

[0037] Furthermore, the single-action stamping of the punches involved in the multiple processes not only improves the stability, but also adaptively adjusts the use sequence between different punches according to different use occasions, so as to improve the forming precision of the products by adjusting the operation sequence between the processes.

[0038] In addition, the split process can realize the synchronous processing of multiple products in the state of multi-machine linkage, thereby improving the efficiency of product forming processing. Compared with the overall process equipment in the prior art, the flexibility of use is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The layout in the plate turning bracket forming process in the prior art;

[0040] Figure 2 The first perspective structure diagram of the plate turning bracket after forming of the present application;

[0041] Figure 3 The second perspective structure diagram of the plate turning bracket after forming of the present application;

[0042] Figure 4 The layout in the plate turning bracket forming process in the present application;

[0043] Figure 5Fig. 1 is a schematic view of two plate blanks and auxiliary materials in a plate turning bracket forming process of the present application;

[0044] Figure 6 Fig. 2 is a schematic view of the first bending process in the plate turning bracket forming process of the present application;

[0045] Figure 7 Fig. 3 is a schematic view of the first bending forming in the plate turning bracket forming process of the present application;

[0046] Figure 8 Fig. 4 is a schematic view of the correction process in the plate turning bracket forming process of the present application;

[0047] Figure 9 Fig. 5 is a schematic view of the second bending forming in the plate turning bracket forming process of the present application;

[0048] Figure 10 Fig. 6 is a schematic view of the structure of a plate turning bracket forming progressive die in an alternative embodiment of the present application.

[0049] Fig. 1 is a schematic view of two plate blanks and auxiliary materials in a plate turning bracket forming process of the present application; DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0051] Embodiment 1

[0052] Please refer to Figures 3 to 9 The present application provides a plate turning bracket forming process, as shown in the drawings, for forming a turning bracket close to a U shape, including an A surface, a B surface, a C surface and a D surface. The perpendicularity of the A surface and the D surface, the parallelism of the C surface and the D surface and the perpendicularity of the C surface and the B surface are important control parts in the whole turning bracket forming process.

[0053] The plate material turning bracket forming process adopted in the embodiment comprises steps S1, S2 and S3 in sequence, and steps S4, S5 and S6 in no particular order after step S3.

[0054] In detail, step S1: die releasing; at least two plate material blanks 3 are released from the die in one time to form a first state product.

[0055] It should be further explained that in the forming of the first state product, a first bending edge line is preset on the first state product, and a retaining edge 23 is formed beside the first bending edge line. The retaining edge 23 has the first bending edge line on one side and an arc-shaped bending transition between the retaining edge 23 and the first U-shaped bending 26 and the second U-shaped bending 27 formed subsequently on the other side. That is, the retaining edge 23 is directly formed in an independent part in the forming of the first state product, and does not need to be bent again with the first U-shaped bending 26 and the second U-shaped bending 27 formed subsequently, that is, the retaining edge 23 is directly formed in the die releasing process by the design of the die, which greatly simplifies the processing technology.

[0056] Step S2: first bending; the first bending edge line preset on the first state product is bent to form a second state product with a first bending edge 21 and a second bending edge 22. Here, after the first bending edge 21 and the second bending edge 22 are bent in place, the first bending edge 21 and the second bending edge 22 form a perpendicular state with the corresponding retaining edge 23.

[0057] Step S3: correction; the flatness of the first bending edge 21 and the second bending edge 22 and the perpendicularity of the first bending edge 21 and the second bending edge 22 to the corresponding retaining edge 23 of the second state product are corrected.

[0058] Step S4: punching round hole 24; the first bending edge 21 and the second bending edge 22 corrected in step S3 are punched with a round hole 24 to form a third state product.

[0059] Step S5: punching waist-shaped hole 25; the retaining edge 23 is punched with a waist-shaped hole 25 to form a fourth state product.

[0060] Step S6: second bending; the U-shaped bending line preset on the fourth state product is bent to form a fifth state product with a first U-shaped bending 26 and a second U-shaped bending 27.

[0061] The specific order of steps S4, S5, and S6 can be adjusted according to the actual molding and usage requirements of the product. When the plate material for manufacturing the steering bracket is thick, if the second bend is performed first, followed by punching the circular hole 24, a large blanking force is required when punching the circular hole 24, resulting in a larger collapse angle around the circular hole 24. At the same time, it affects the perpendicularity of the B and C surfaces. Therefore, considering the appearance and precision of the product, it is preferable to perform the punching of the circular hole 24 in step S4 first, followed by the second bend in step S6, and finally the punching of the waist-shaped hole 25 in step S5; or it is preferable to perform the punching of the circular hole 24 in step S4 first, followed by the punching of the waist-shaped hole 25 in step S5, and finally the second bend in step S6.

[0062] Next, let's go into detail: Step S1 demolding includes: Step S11: continuous layout; the material mold is arranged obliquely to form two sheet blanks 3 with auxiliary material 4 connected in the middle. In this embodiment, combined with the specific shape of the steering bracket, we take the case of forming two sheet blanks 3 with one mold and two cavities as an example.

[0063] It should be noted that the specific angle of the die's oblique arrangement here can be selected from 0 degrees to 27 degrees (this angle specifically refers to the angle at which the pattern is arranged on the strip, and this angle is based on the width direction of the strip as a reference). Figure 4 From the perspective shown, the die arrangement is formed by rotating the die 20 degrees clockwise from a 0-degree angle with the strip. Specifically, when the die angle is 0 degrees, the resulting sheet metal blank has sufficient strength, but the material utilization rate for the entire strip is only 51.28%. When the die angle is 20 degrees, the resulting sheet metal blank has lower strength than when the die angle is 0 degrees, but the material utilization rate for the entire strip reaches 56%. When the die angle is 27 degrees, the resulting sheet metal blank has lower strength than when the die angle is 20 degrees, but the material utilization rate for the entire strip reaches 57.74%. Therefore, considering both the strength of the resulting sheet metal blank and the material utilization rate of the strip, the preferred angle is 20 degrees.

[0064] Step S12: Cutting; The auxiliary material 4 between the two consecutively laid-out sheet blanks 3 is cut off to form two separate first-state products, so that the products can be flipped over as needed in the subsequent stamping process to adjust the stamping angle and method, thereby improving the stamping accuracy and reducing the product forming defect rate.

[0065] On the basis of the above structure, the two plate blanks 3 are arranged back to back in step S11, and such structure is to make full use of the waste material in the middle of the two plate blanks 3; and the arc protrusions on the back surfaces of the two plate blanks 3 are distributed in a staggered manner, and such structure is to minimize the width of the middle connecting auxiliary material 4, thereby improving the utilization rate of the material strip to reduce the material cost of the product. It should be noted that the two plate blanks 3 need to be cut to form two separate first state products in the subsequent processing process, and therefore the influence of the cutting process on the strength of the single body after the two plate blanks 3 are separated cannot be ignored in the cutting process, and the cutting process is directly affected by the width of the middle connecting auxiliary material 4 between the two plate blanks 3. When the width of the middle connecting auxiliary material 4 is too small, the cutting process is prone to improper cutting, which may result in that the strength of the first state product after cutting does not meet the standard. Therefore, the structure that the arc protrusions on the back surfaces of the two plate blanks 3 are distributed in a staggered manner in the embodiment is to fully consider that the width of the middle connecting auxiliary material 4 between the two plate blanks 3 should meet the use requirements of the cutting operation, and the material utilization rate of the material strip as a whole should also be considered. That is, the arrangement mode of the two plate blanks 3 in the embodiment also effectively reduces the difficulty of the cutting process and can effectively ensure the overall cutting precision by controlling the width of the middle connecting auxiliary material 4.

[0066] More specifically, for the cutting of step S12, the main function is to cut off the auxiliary material 4, and the cutting process is to ensure that the cutting is performed along the edge where the plate blank 3 is connected to the auxiliary material 4, so that the auxiliary material is completely cut off to form an independent first state product. In this case, each process can be independently punched during the subsequent processing of the first state product, thereby ensuring the operation precision of each independent processing process.

[0067] In more detail, step S2: In step S2, the pressing plate 52 and the bending lower die 53 which are both profiled structures are used to clamp and hold the holding edge 23. Moreover, step S2 also includes bending the H edge 28 while forming the first bending edge 21 and the second bending edge 22. In this way, the machining process of the overall plate turning bracket can be effectively simplified, and the overall machining efficiency can be improved. More specifically, the H edge 28 is formed at the corners formed by the holding edge 23 and the corresponding first bending edge 21 and the holding edge 23 and the corresponding second bending edge 22. The H edge 28 on the turning bracket involved in the embodiment mainly plays a reinforcing role, which ensures the perpendicularity between the first bending edge 21 and the corresponding holding edge 23 and between the second bending edge 22 and the corresponding holding edge 23, thereby ensuring the relative positions of the circular hole 24 on the first bending edge 21 and the second bending edge 22 and the waist-shaped hole 25 of the corresponding holding edge 23.

[0068] In the above process, it is also necessary to be pointed out that in the above process, the lower die 53 does not form a thrust force for the retaining edge 23, that is, the retaining edge 23 is formed by the pressure plate 52 to form a single-sided force structure, in which case sufficient pressure force must be ensured to prevent the product from being displaced, so nitrogen gas springs 54 are selected to apply force to the pressure plate 52 on the retaining edge 23. Then, through the clamping and limiting state of the retaining edge 23, the bending punch 51 is used to bend the first bending edge 21 and the second bending edge 22 and the H edge 28.

[0069] Next, the correction of step S3 is described:

[0070] In step S3, the upper and lower stamping correction devices are used to correct the flatness of the first bending edge 21 and the second bending edge 22; and the upper and lower stamping correction devices include a cooperating upper die correction unit 63 and a lower die correction unit 64; the upper die correction unit 63 and the lower die correction unit 64 are respectively adapted to abut the upper and lower end surfaces of the first bending edge 21 and the second bending edge 22. Compared with the prior art, the side stamping method is used to correct the flatness, and the stamping force generated by the side stamping method is more direct and effective than the stamping force in the upper and lower directions, that is, the stamping method in the upper and lower directions can effectively ensure the stamping force, thereby ensuring the perpendicularity of the B surface.

[0071] On the basis of the above structure, in order to improve the correction effect of the flatness of the first bending edge 21 and the second bending edge 22, the upper die correction unit 63 and the lower die correction unit 64 in the embodiment respectively include a plurality of area correction blocks arranged in an array. In this structure, the area correction blocks at different positions can be adjusted according to the height requirements of different planes, and the flatness correction of products with different plane requirements can be realized.

[0072] On the basis of the above structure, it is also necessary to be pointed out that in the lower die correction unit 64 of the upper and lower stamping correction device in the embodiment, the movable slide block 61 is used to realize the clamping and limiting of the retaining edge 23 connecting the first bending edge 21 and the second bending edge 22, that is, to ensure the perpendicularity of the C surface. That is, the lower die correction unit 64 in the embodiment can simultaneously correct the perpendicularity of the B surface and the C surface, that is, it achieves the effect of killing two birds with one stone. And the correction of the perpendicularity of the B surface and the C surface is completed at the same time, which can effectively simplify the machining process of the overall plate turning bracket and improve the overall machining efficiency. The movable slide block 61 can be connected with a driving structure 62 adapted to drive the slide block 61 to move linearly to control the movement process.

[0073] Finally, it is necessary to point out that for the punch equipment required in steps S4, S5 and S6 in the embodiment, the technology maturely used in the prior art can be adopted, and the embodiment is not absolutely limited.

[0074] In summary, the single-action punching involved in the steps of the embodiment not only improves stability, but also adaptively adjusts the use sequence of different punches according to different use occasions, so as to improve the forming precision of products by adjusting the operation sequence between steps.

[0075] Embodiment 2:

[0076] Referring to FIG. 1, Figure 10 The embodiment provides a plate turning bracket forming continuous die for realizing the plate turning bracket forming process of embodiment 1, which comprises:

[0077] The first bending punch 72 and the correction punch 74 are arranged in sequence, and the circular hole punch 75, the waist hole punch 78 and the second bending punch 76 are arranged in no sequence behind the correction punch 74.

[0078] Specifically, the first bending punch 72 corresponds to the first bending of step S1 of the plate turning bracket forming process of embodiment 1; the correction punch 74 corresponds to the correction of step S2; the circular hole punch 75 corresponds to the punching of the circular hole 24 of step S3; the waist hole punch 78 corresponds to the punching of the waist hole 25 of step S4; and the second bending punch 76 corresponds to the second bending of step S5.

[0079] Similarly, based on the thickness of the specific plate, the sequence of the three punches, i.e., the circular hole punch 75, the waist hole punch 78 and the second bending punch 76, in the embodiment can be adjusted according to actual conditions.

[0080] The continuous die designed in the embodiment is a split process, and when the split process is in the state of multi-machine linkage, the synchronous processing of multiple products can be realized, thereby improving the efficiency of product forming processing. Compared with the integral process equipment in the prior art, the flexibility of use is stronger. For example, when a turning bracket is processed by the first bending punch 72 for the first time, another turning bracket can be processed by the second bending punch 76 for the second time. Two products are processed at the same time, each using one punch, and they do not interfere with each other. As long as the processing time of the two does not cross and conflict, the synchronous processing of the punches corresponding to different processes can be realized to effectively improve the processing efficiency of the whole product.

[0081] Of course, it is also necessary to point out that, in an alternative case, for example, when the plate turning bracket forming continuous die of the embodiment is arranged in sequence by punch as follows: first bending punch 72, correction punch 74, round hole punch 75, second bending punch 76 and waist hole punch 78, in combination with the specific forming of the turning bracket, in the process of machining the first bending punch 72, the A surface of the turning bracket faces up, in the process of machining the correction punch 74, the B surface of the turning bracket faces up, in the process of machining the round hole punch 75, the C surface of the turning bracket faces up, in the process of machining the second bending punch 76, the A surface of the turning bracket faces up, and in the process of machining the waist hole punch 78, the B surface of the turning bracket faces up. Therefore, in the process of manufacturing the bracket by using the above process, it is necessary to change the surface many times, the manual operation is difficult, the production cycle is long, and a large number of operators are needed, which causes the waste of manpower; therefore, a multi-station continuous die can be designed, and a mechanical hand 8 can be used instead of manual operation. In the above continuous die design, a first turnover table 73 needs to be added between the first bending punch 72 and the correction punch 74, and a second turnover table 77 needs to be added between the second bending punch 76 and the waist hole punch 78, and the product is turned over to the correct working surface for stamping through the first turnover table 73 and the second turnover table 77.

[0082] The specific use mode of the above continuous die is as follows: manual feeding - the first mechanical hand 8 takes the material from the conveying belt 71 and sends it into the first bending punch 72 - stamping is completed (the first bending edge 21 and the second bending edge 22 are formed) - the second mechanical hand 8 takes the material from the first bending punch 72 and sends it into the first turnover table 73 - the turnover table turns over the product - the second mechanical hand 8 takes the material from the first turnover table 73 and sends it into the correction punch 74 - stamping is completed (the correction plane is formed) - the third mechanical hand 8 takes the material from the correction punch 74 and puts it into the round hole punch 75 - stamping is completed (the round hole 24 is formed) - the fourth mechanical hand 8 takes the material from the round hole punch 75 and puts it into the second bending punch 76 - stamping is completed (the first U-shaped bending 26 and the second U-shaped bending 27 are formed) - the fifth mechanical hand 8 takes the material from the second bending punch 76 and puts it into the second turnover table 77 - the turnover table turns over the product - the fifth mechanical hand 8 takes the material from the second turnover table 77 and puts it into the waist hole punch 78 - stamping is completed (the waist hole 25 is formed) - the sixth mechanical hand 8 takes the material from the waist hole punch 78 and puts it into the discharging conveying belt 79, and all stamping actions are completed.

[0083] The above specific embodiment further details the purpose, technical solution and beneficial effects of the present application, and it should be understood that the above is only a specific embodiment of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0084] In the description of the application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0085] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0087] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the parts must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0088] In the present application, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A sheet material turning bracket forming process, characterized in that, comprising: Step S1: die releasing; adopting continuous layout to die release at least two sheet material blanks to form a first state product; Step S2: first time bending; bending the preset first time bending line on the first state product to form a second state product with a first bending edge and a second bending edge; Step S3: correcting; correcting the flatness of the first bending edge and the second bending edge on the second state product and the perpendicularity of the first bending edge and the second bending edge to the corresponding retaining edge; Step S4: punching a circular hole; punching a circular hole on the first bending edge and the second bending edge after the correction of step S3 to form a third state product; Step S5: punching a waist-shaped hole; punching a waist-shaped hole on the retaining edge to form a fourth state product; Step S6: second time bending; bending the preset U-shaped bending line on the fourth state product to form a fifth state product with a first U-shaped bending and a second U-shaped bending; wherein Step S1, Step S2 and Step S3 are sequentially performed, and Step S4, Step S5 and Step S6 are not in sequence after Step S3; the die releasing of Step S1 comprises: Step S11: continuous layout; intermediate two sheet material blanks with auxiliary material connection are formed by material die oblique layout; the two sheet material blanks are arranged back to back; and the back surfaces of the two sheet material blanks are distributed with arc protrusions staggered; Step S12: cutting; cutting the auxiliary material between the two sheet material blanks to form two separate first state products; the Step S2 further comprises bending the H edge while forming the first bending edge and the second bending edge; in the Step S3, the flatness of the first bending edge and the second bending edge is corrected by using an upper and lower stamping correction device; the upper and lower stamping correction device comprises an upper die correction unit and a lower die correction unit used in cooperation; the upper die correction unit and the lower die correction unit are respectively adapted to abut the upper and lower end surfaces of the first bending edge and the second bending edge; the upper die correction unit and the lower die correction unit respectively comprise a plurality of area correction blocks distributed in an array.

2. A sheet turning carriage forming process according to claim 1 wherein, Step S4, Step S5 and Step S6 are sequentially performed.

3. A sheet turning cradle forming process according to claim 1 or 2, wherein, in the Step S2, a pressure plate and a bending lower die with adaptive and identical profiling structures are used to form the first bending edge and the second bending edge.

4. A sheet turning carriage forming process as defined in claim 1, wherein, the lower die correction unit cooperates with a movable sliding block to realize clamping and limiting of the corresponding retaining edge of the first bending edge and the second bending edge.

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