A stamping and drawing process method for automobile load-bearing floor

Abstract

The present invention discloses a stamping and drawing process method for a vehicle load-bearing floor, comprising the following steps: matching the distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die with the drawing depth of the three-dimensional component, so that the drawing depth is the distance between the first level surface of the lower protrusion and the top of the upper protrusion, setting a concave surface of the upper die with a depth range of 10 to 15 mm, cooperating with the corresponding convex surface of the lower die, forming a punch supplementary surface on a flat blank, and replacing the die for secondary stamping so that the edge line in front of the root of the upper protrusion divides the punch supplementary surface into two parts. The process method of the present invention makes the drawing depth moderate, controls the size of the subsequent workload, reduces the risk of cracking of the vehicle load-bearing floor after forming, and the distance between the "U"-shaped corner formed by the boundary line of the upper protrusion and the flat area formed during the stamping process is close to the pressing surface, avoiding the problem of wrinkling due to the accumulation of more corner materials and cracking due to insufficient material inflow due to excessive pressing resistance.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a stamping and drawing process method for an automobile load-bearing floor. Background Art

[0002] The rear floor structure is the supporting part of the vehicle body. In terms of structural design, the rear floor structure should provide sufficient strength and rigidity to ensure the load-bearing capacity of the vehicle body. Therefore, the reasonable layout and overlap design of the rear floor crossbeam and longitudinal beam structure are very important.

[0003] The rear floor is generally composed of the rear floor panel assembly and the rear floor beam frame assembly. The rear floor panel has two structural forms: one is an integral structure, which is a frame welded by the longitudinal beams, cross beams, middle transmission bulges, rear tail beams and side beams of the chassis, and is welded together with the floor panel to form a load-bearing body chassis; the other is a combination of a middle floor panel and a rear floor. The entire chassis is welded by two or three floors. There are two longitudinal beams at the front end of the car that are welded together with the front fender, front floor, and side sill side beams. There are two longitudinal beams at the rear of the car. The front end bypasses the rear wheel cover and is welded to the door opening side beam, and the rear end is welded to the tail beam. The rear tail beam has the function of supporting the rear trunk floor. The rear bumper is also fixed on the rear tail beam to protect the rear body. Generally, for rear floor panels with small floors, simple shapes, and good stamping formability, an integral structure is adopted; while for rear floors with large floors, complex shapes, and poor stamping formability, they should be processed in two parts, namely the middle floor panel body and the rear floor body.

[0004] The car load floor is an important car structural component of the rear floor body, mainly used as a storage space for spare tires and various small tools. Depending on the shape and function of the car, the matching load floor is also varied. This part has a large structural fluctuation and a deep drawing depth, and is one of the important structural components that test the level of stamping technology.

[0005] The forming of the load-bearing floor is mainly achieved through processes such as drawing, trimming and punching, flanging and shaping, punching and wedge flanging, etc. The forming process of the parts mainly depends on the drawing process, which determines the appearance quality of the parts and also determines the dimensional accuracy of the parts.

[0006] In the process of sheet metal forming, in order to control the flow speed and direction of the material, it is necessary to set drawbeads at local positions on the pressing surface. Different types of drawbeads will cause different deformation degrees and distributions in the deformation zone of the sheet metal. In order to effectively control the flow of the material and avoid the occurrence of various defects, it is necessary to reasonably design the position, shape and geometric parameters of the drawbeads. The cross-section of the drawbeads usually adopts simple shapes such as circles, rectangles and triangles; according to whether the drawbeads are closed or not, they can also be divided into ring drawbeads and linear drawbeads; they can be single or multiple, and their location is usually obtained by offsetting the die mouth line outward from the pressing surface by a certain distance.

[0007] The drawing process, i.e., drawing, is a stamping method that uses a punch to punch a sheet into a die to form a three-dimensional component with the shape of the die cavity, also known as deep drawing or deep drawing.

[0008] The trimming and punching process, i.e. trimming, is a stamping process that shears off the process supplementary parts added around the stamping parts and the process supplementary parts added inside the stamping parts to ensure deep drawing; punching is a stamping process that separates waste materials from materials or process parts along a closed contour to obtain the required holes on the material or process parts.

[0009] The flanging shaping process, i.e. flanging, refers to a forming method in which a straight wall or flange with a certain angle is formed along a closed or unclosed curved edge on the flat or curved part of the blank by using a mold; shaping is to use a shaping mold to press the inaccurate parts of a bent or stretched part into an accurate shape; or for stamping parts with surface flatness requirements, a leveling die is used to flatten flat stamping parts with arches and warps.

[0010] like Figure 1 The figure shows the load-bearing floor of a model of a certain passenger car company. The part includes a flat area 4, an upper protrusion 1 located between the flat areas 4, a lower protrusion primary surface 2 and a lower protrusion secondary surface 3 located in front of the root of the upper protrusion 1, and a local sinking area. There are positive and negative protrusion profiles. The structure is more complex than that of a general load-bearing floor, which is extremely challenging to the process level. Due to the complex shape of the load-bearing floor, deep drawing depth, large fluctuations, and rapid shape changes, it is easy to cause different requirements for material inflow in different parts, making the produced parts prone to wrinkling, cracking and other quality problems. Therefore, it is particularly important to keep the part in proper material inflow during the forming process to avoid quality problems caused by insufficient or excessive inflow during the forming process.

[0011] Generally speaking, the forming properties of parts are mainly determined by the drawing process in the stamping process. The drawing process involves the production of drawing dies, which are divided into upper dies, lower dies and blank holders. The corresponding parts are formed by making the drawing dies and using them to stamp the blanks. The profile of the drawing process is divided into three parts: the pressing surface, the punch and the concave die. Usually, the parting line is along the raised side wall of the profile and the root fillet of the plane area. However, for the upper Figure 1 For this kind of complex-shaped load-bearing floor, conventional drawing process cannot guarantee the formability of the part and will cause quality defects, which are not allowed to exist in automobiles (for the convenience of understanding, it should be explained that the pressing surface refers to the part of the molding surface other than the radius of the corner of the die; the punch is also called the punch needle, punch, male mold, upper mold, etc. The punch is the part used to form the inner surface of the product in the mold, that is, the part with the outer shape as the working surface; the die is also called the cavity mold, which is the working part on the outer surface of the molded part, that is, the part that constitutes the product space; the parting line is generally determined by the pressing surface. When the movable mold and the fixed mold are combined, a line will be generated on all surfaces at the junction of the movable and fixed molds, which is the parting line; the edge holding ring is a ring-shaped clamping device set on the edge between the concave and convex molds to prevent the edge of the workpiece from becoming unstable and wrinkling during the drawing process).

[0012] There are generally two existing process methods for load-bearing floor parts with complex structures:

[0013] Option 1: If Figure 2 As shown, in the drawing process of this scheme, the total depth of the part (that is, the distance from the highest point of the top surface of the upper protrusion 1 to the lowest point of the part) is the drawing depth, the pressing surface 5 of scheme 1 is based on the secondary surface 3 of the lower protrusion of the part, all shapes are on the surface of the punch, and the parting line 6 of scheme 1 is formed along the outer peripheral contour of the part. After the drawing is completed, the trimming and punching process, the flanging and punching shaping process, and the wedge shaping process are obtained as shown in FIG. Figure 3 Finished part shown.

[0014] The problem with this solution is that the main forming of the load-bearing floor is achieved in the drawing process, and the subsequent processes are only trimming, punching and flanging. The safety factor of the subsequent processes is high and there will be no quality problems. The key to forming depends on the drawing process. However, the drawing depth of the drawing process is deep, and the parting line 6 of the first solution is carried out along the periphery. The complex shapes of the parts are all on the convex model surface. The parts will break due to the excessive drawing depth, and the boundary between the upper protrusion 1 and the flat area 4 and the lower protrusion is U-shaped. The parting line 6 of the first solution is at the end of the U-shape, far away from the bottom corner area of ​​the U-shape. The resistance of the pressing surface cannot effectively control the amount of material inflow, and the corners will wrinkle or even stack due to excessive material inflow.

[0015] Option 2: If Figure 4As shown, the drawing process of this scheme takes the flat area 4 of the part as the drawing pressing surface reference, the drawing depth is set as the distance from the flat area 4 to the top of the upper protrusion 1, and the root fillet of the shape of the upper protrusion 1 is used as the scheme two-parting line 7, after the trimming and punching process, the flanging and punching shaping process, the wedge shaping process and the shaping of the lower protrusion in the part shape are obtained as shown in FIG. Figure 5 Finished part shown.

[0016] The problem with this solution is that compared with method 1, the drawing depth of the drawing process is reduced, excluding the depth of the lower convex part of the part. The parting line 7 of solution 2 of the part is on the boundary line between the upper convex part 1 and the flat area 4, which can effectively control the amount of material inflow and ensure the quality of the drawing process. However, the process requires shaping of the lower convex part, and excessive shaping will also cause the process part to break. Summary of the invention

[0017] In view of the defects existing in the prior art, the technical problem solved by the present invention is: for automobile load-bearing floor parts with relatively complex shapes and structures, how to set the process parameters of the drawing process to control the material inflow during stamping and ensure the part molding quality.

[0018] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0019] A stamping and drawing process method for an automobile load-bearing floor comprises the following steps:

[0020] The flat blank is placed on the blank holder at the outer edge of the lower die, and the upper die is located above the lower die. The distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die matches the drawing depth of the three-dimensional component. The drawing depth is the distance between the first level of the lower convexity and the top of the upper convexity. The flat blank is punched by the upper die, the lower die and the blank holder. During the punching process, the upper die has a concave surface with a depth range of 10 to 15 mm, which cooperates with the corresponding convex surface of the lower die to form a punch supplementary surface on the flat blank. The upper die and the lower die are replaced for secondary punching. After punching, an upper convexity and a flat area are formed on the flat blank, and the edge line in front of the root of the upper convexity can separate the punch supplementary surface into two parts, thereby forming a three-dimensional component.

[0021] Preferably, the three-dimensional component is trimmed and punched after the secondary stamping.

[0022] Preferably, the punching die for the punching process is a vertical trimming punching die or an oblique wedge trimming punching die.

[0023] Preferably, after the punching process is completed, the three-dimensional component is subjected to flanging and shaping processes.

[0024] Preferably, after the shaping process, a leveling die is used to level the three-dimensional component.

[0025] Preferably, the overall structure of the three-dimensional component after the flanging process includes a flat area, an upper protrusion arranged between two flat areas, and a part of the punch supplementary surface arranged at the front root of the upper protrusion.

[0026] Preferably, the top surface of the upper protrusion is provided with at least two positioning holes.

[0027] Preferably, at least two through holes are provided on the front side of the upper protrusion.

[0028] Preferably, at least two reinforcing ribs and at least two mounting holes are provided on each side surface of the flat area.

[0029] Preferably, the steps of making the upper die, the lower die and the blank holder include:

[0030] S1: Set the distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die to match the drawing depth of the three-dimensional component to determine the drawing depth;

[0031] S2: Set a concave surface with a depth range of 10 to 15 mm on the upper die, match the concave surface with the convex surface of the lower die, and smooth the concave and convex surfaces;

[0032] S3: Setting the outer edge range of the upper die and the corresponding lower die;

[0033] S4: Use CNC machine tools to process the designed upper die, lower die and blank holder models.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] Compared with Scheme 1, the drawing depth of this process is shallower, which reduces the risk of cracking of the automobile load-bearing floor after forming. In addition, the distance between the "U"-shaped corner formed by the boundary line between the upper protrusion and the flat area formed during the stamping process is closer to the pressing surface (the pressing surface refers to the part of the molding surface outside the radius of the die corner), which avoids the problem of wrinkling caused by excessive accumulation of corner material due to the long distance, and also avoids the problem of cracking caused by insufficient material inflow due to excessive pressing resistance caused by the close distance between the pressing surface and the straight line segment of the first-level surface of the lower protrusion.

[0036] Compared with the second scheme, this process has a deeper drawing depth, which controls the subsequent workload and prevents the cracking of the automobile load-bearing floor after forming due to excessive workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 It is a schematic diagram of the overall structure of the automobile load-bearing floor panel in the background technology of the present invention;

[0039] Figure 2 A schematic diagram of the drawing depth of solution 1 in the background technology of the present invention;

[0040] Figure 3 It is a structural schematic diagram of a drawing process part in scheme 1 of the background technology of the present invention;

[0041] Figure 4 This is a schematic diagram of the drawing depth of solution 2 in the background technology of the present invention;

[0042] Figure 5 It is a structural schematic diagram of the drawing process parts of the second scheme in the background technology of the present invention;

[0043] Figure 6 It is a structural schematic diagram of a drawing die for a vehicle load-bearing floor according to an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the drawing depth of the automobile load-bearing floor according to an embodiment of the present invention;

[0045] Figure 8 It is a schematic diagram of the male mold supplementary surface of the automobile load-bearing floor according to an embodiment of the present invention;

[0046] Fig. 9 This is a schematic diagram of secondary stamping of a vehicle load-bearing floor according to an embodiment of the present invention;

[0047] Fig.10 It is a schematic structural diagram of a three-dimensional structure of a vehicle load-bearing floor after flanging treatment according to an embodiment of the present invention.

[0048] In the figure: 1-upper protrusion; 11-positioning hole; 12-through hole; 2-lower protrusion primary surface; 3-lower protrusion secondary surface; 4-flat area; 41-reinforcement rib; 42-mounting hole; 5-pressing surface of scheme 1; 6-parting line of scheme 1; 7-parting line of scheme 2; 8-punch supplementary surface. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] Some relevant process terms in this embodiment have been explained in detail in the background technology, and will be directly quoted in the following text without further elaboration.

[0051] like Figure 1 As shown, the automobile load-bearing floor comprises a flat area 4, an upper protrusion 1 located between two flat areas 4, a lower protrusion primary surface 2 located at the front root of the upper protrusion 1, and a lower protrusion secondary surface 3.

[0052] In this embodiment, a stamping and drawing process method for a vehicle load-bearing floor comprises the following steps:

[0053] like Figure 7-9 As shown, the flat blank is placed on the blank holder located at the outer edge of the lower die, the upper die is located above the lower die, and the distance between the lowest point depth of the upper die and the highest point height of the corresponding lower die (in this embodiment, the upper die is a concave die and the lower die is a convex die) matches the drawing depth of the three-dimensional component, and the drawing depth is the distance between the first-level surface 2 of the lower protrusion and the top of the upper protrusion 1. The flat blank is punched by the upper die, the lower die and the blank holder. During the punching process, the concave surface of the upper die with a depth range of 10 to 15 mm cooperates with the convex surface corresponding to the lower die to form a convex supplementary surface 8 on the flat blank. The upper die and the lower die are replaced for secondary punching. After punching, an upper protrusion 1 and a flat area are formed on the flat blank, and the edge line in front of the root of the upper protrusion 1 can separate the convex supplementary surface 8 into two parts, thereby forming a three-dimensional component (that is, an intermediate process part of the production of the automobile load-bearing floor, which has the structure of a part of the automobile load-bearing floor).

[0054] Compared with the prior art, the above process method has the following effects:

[0055] Compared with Scheme 1, the drawing depth of this process is shallower, which reduces the risk of cracking of the automobile load-bearing floor after forming. In addition, the distance between the "U"-shaped corner formed by the boundary line of the upper protrusion 1 and the flat area 4 formed during the stamping process is closer to the pressing surface (the pressing surface refers to the part of the molding surface outside the radius of the upper mold corner), which avoids the problem of wrinkling caused by excessive accumulation of corner materials due to the long distance, and also avoids the problem of cracking due to insufficient material inflow caused by the close distance between the pressing surface and the straight line segment of the first-level surface 2 of the lower protrusion.

[0056] Compared with the second scheme, this process has a deeper drawing depth, which controls the subsequent workload and prevents the cracking of the automobile load-bearing floor after forming due to excessive workload.

[0057] Furthermore, after the secondary stamping, the three-dimensional component is trimmed and punched, specifically: the upper die on the punching machine is replaced with a trimming die, and the burrs formed by punching on the entire circumference of the edge of the three-dimensional component and the part of the punch supplementary surface 8 separated by the edge line in front of the root of the upper protrusion 1 and away from the upper protrusion 1 are removed and repaired to ensure that the edge of the three-dimensional component is smooth all around and facilitate subsequent flanging and the sliding of waste materials. The trimming die on the punching machine is replaced with a punching die, and the plate surface of the three-dimensional component is positioned so that the punch can accurately contact the opening position on the plate surface. Under the limiting effect of the pressure ring on the plate, the slider of the punching machine is used to drive the punching die to move, so that the punch of the punching die can accurately punch the three-dimensional component.

[0058] Furthermore, in this embodiment, during the punching process, the punching die is selected to be a vertical trimming punching die or an oblique wedge trimming punching die to meet the needs of opening holes of different positions, shapes and sizes on the three-dimensional component.

[0059] Furthermore, after the punching process is completed, the three-dimensional component is subjected to flanging and shaping processes, specifically: the punching die on the punching machine is replaced with a flanging die, and the outer edges on both sides of the flat area 4 of the three-dimensional component are pressed and flanging to form vertical downward shaping edges. After the flanging is completed, the punching die on the punching machine is replaced with a flanging die, and the three-dimensional component is shaped using the sheet material supplemented by the part of the punch supplementary surface 8 retained by the trimming process, and the inaccurate bending and stretching of the three-dimensional component is pressed into an accurate shape to form a structure of the part below the lower raised primary surface.

[0060] Furthermore, after the shaping process, a leveling die can be used to level the three-dimensional component, specifically, the arches and warps of the flat area 4 plane are flattened to meet the flatness requirements of the vehicle load-bearing floor.

[0061] Furthermore, if Fig.10 As shown, the overall structure of the three-dimensional component after the flanging process includes a flat area 4, an upper protrusion 1 arranged between the two flat areas 4, and a part of the convex mold supplementary surface 8 arranged at the front root of the upper protrusion 1. The upper protrusion 1 is provided on the load-bearing floor of the automobile for the following main purposes: first, it is used to place and install the transmission shaft or exhaust pipe; second, it can improve the longitudinal rigidity of the automobile floor and improve the modal value of the rear floor at the same time. The cavity space of the upper protrusion 1 raises the height of the automobile parts, which is conducive to avoiding collision and contact with the above parts in the event of a collision accident.

[0062] Furthermore, if Fig.10As shown, at least two positioning holes 11 are provided on the top surface of the upper protrusion 1. The positioning holes 11 are holes used to ensure the correct position when the supporting floor is connected with other parts. In this embodiment, two positioning holes 11 are generally provided, usually a round hole and a waist-shaped hole, and the plane of the positioning holes 11 is parallel to the main plane as much as possible, and curved surface and double inclined surface design are not allowed.

[0063] Furthermore, if Fig.10 As shown, at least two through holes 12 are provided on the front side of the upper protrusion 1. The through holes 12 are holes provided to ensure that other parts need to partially pass through the load-bearing floor parts to realize certain functions without affecting the installation of the load-bearing floor. In this example, the through holes 12 are selected as the installation tool avoidance through holes 12, the part avoidance through holes 12 or the palm avoidance through holes 12 to ensure that structures such as the water pipe and the retractor can pass through the through holes 12 for installation.

[0064] Furthermore, if Fig.10 As shown, at least two reinforcing ribs 41 and at least two mounting holes 42 are provided on each side surface of the flat area 4. The reinforcing rib 41 generally refers to a component that folds a steel plate into a geometric shape to increase the strength of the vehicle body according to the force and load requirements. The main function is to strengthen the strength and rigidity of these panels and reduce the thickness and weight of the panels, which is conducive to achieving lightweight of the entire vehicle. In this embodiment, the reinforcing rib 41 is in the shape of "I" type and is longitudinally arranged along the vehicle load-bearing floor surface to enhance the bearing capacity of longitudinal impact force; the mounting hole 42 is mainly required for installing the vehicle chassis, interior and accessories on the vehicle body, and is matched with the standard parts for installation. The size and shape are determined by the standard parts according to the purpose. In this embodiment, two types of circular holes or long holes are generally selected. The position requirements of the circular hole are very strict. There is generally no adjustment margin when installing accessories, and the shape of the long hole is generally designed to be composed of a square and two semicircles. This will ensure that there is a certain adjustment margin when installing accessories, so that the accessories can be accurately and conveniently installed on the vehicle body.

[0065] Furthermore, the mold manufacturing process of the upper mold, the lower mold and the blank holder includes the following steps:

[0066] S1: Figure 7 As shown, the distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die is matched with the drawing depth of the three-dimensional component, so that the drawing depth after stamping is the distance between the first level surface 2 of the lower protrusion and the top of the upper protrusion 1;

[0067] S2: Figure 8 As shown, a concave surface with a depth range of 10 to 15 mm is set on the upper die, the concave surface matches the convex surface of the lower die, and the concave and convex surfaces are smoothed around, so that a convex supplementary surface 8 can be formed on the flat blank after stamping;

[0068] S3: Fig. 9 As shown, the outer edge range of the upper die and the corresponding lower die is set so that the edge line in front of the root of the upper protrusion 1 after the secondary stamping can separate the punch supplementary surface 8 on the flat blank into two parts;

[0069] S4: Use a CNC machine tool to process the designed upper die, lower die and blank holder ring models to obtain the corresponding upper die, lower die and blank holder ring.

[0070] It can be seen that the stamping process of the load-bearing floor of the embodiment of the present invention is as follows:

[0071] The flat blank is placed on the blank holder at the outer edge of the lower die, and the upper die is located above the lower die. The distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die matches the drawing depth of the three-dimensional component. The drawing depth is the distance between the first-level surface 2 of the lower protrusion and the top of the upper protrusion 1. The flat blank is punched by the upper die, the lower die and the pressure ring. During the punching process, the upper die has a concave surface with a depth range of 10 to 15 mm, which cooperates with the corresponding convex surface of the lower die to form a punch supplementary surface 8 on the flat blank. The die is replaced for secondary punching. After punching, an upper protrusion 1 and a flat area are formed on the flat blank, and the edge line in front of the root of the upper protrusion 1 divides the punch supplementary surface 8 into two parts. The upper die on the punching machine is replaced with a trimming die, and the burrs formed on the full circumference edge of the three-dimensional part due to punching and the part of the punch supplementary surface 8 separated by the edge line in front of the root of the upper protrusion 1 away from the upper protrusion 1 are cut off and repaired. The trimming die on the punching machine is replaced with a punching die, and the three-dimensional part The plate surface is positioned so that the punch can accurately contact the opening position on the plate surface. Under the limiting effect of the pressure ring on the plate, the slider of the punching machine is used to drive the punching die to move, so that the punching die punch accurately punches the three-dimensional component. The punching die on the punching machine is replaced with a flanging die, and the outer edges on both sides of the flat area 4 of the three-dimensional component are pressed and flanging to form a vertical straight edge. After the flanging is completed, the punching die on the punching machine is replaced with a flanging die, and the three-dimensional component is shaped by the sheet material supplemented by the partial punch supplementary surface 8, and the inaccurate bending and stretching of the three-dimensional component is pressed into an accurate shape to form a structure of the part below the lower convex first-level surface, and a complete structure of the automobile load-bearing floor has been formed.

[0072] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0073] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0074] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A stamping and drawing process method for an automobile load-bearing floor, the automobile load-bearing floor comprising a flat area (4), an upper protrusion (1) located between two flat areas (4), a lower protrusion primary surface (2) and a lower protrusion secondary surface (3) located at the front root of the upper protrusion (1), the lower protrusion secondary surface (3), the lower protrusion primary surface (2), the two flat areas (4) and the upper protrusion (1) being arranged in sequence from bottom to top along the Z-axis direction of the vehicle coordinate system, characterized in that: The punching and drawing process method comprises the following steps: placing a flat blank on a blank holder located at the outer edge of a lower die, the upper die being located above the lower die, the distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die being matched with the drawing depth of the three-dimensional component, so that the drawing depth is the distance between the first-level surface (2) of the lower protrusion and the top of the upper protrusion (1), punching the flat blank through the upper die, the lower die and the blank holder, during the punching process, the concave surface of the upper die having a depth range of 10 to 15 mm cooperates with the corresponding convex surface of the lower die to form a punch supplementary surface (8) on the flat blank, replacing the die for secondary punching, after punching, forming an upper protrusion (1) and a flat area (4) on the flat blank, and making the edge line in front of the root of the upper protrusion (1) divide the punch supplementary surface (8) into two parts to form a three-dimensional component; after the secondary punching, the three-dimensional component is trimmed and punched.

2. The stamping and drawing process of the automobile load-bearing floor according to claim 1, characterized in that: The punching die for punching processing can be a vertical trimming punching die or an oblique wedge trimming punching die.

3. The stamping and drawing process of a vehicle load-bearing floor as claimed in claim 1, characterized in that: After the punching process is completed, the three-dimensional component is subjected to flanging and shaping processes.

4. The stamping and drawing process of the automobile load-bearing floor as claimed in claim 3, characterized in that: After the shaping process, a leveling die is used to level the three-dimensional component.

5. The stamping and drawing process of the automobile load-bearing floor as claimed in claim 3, characterized in that: The overall structure of the three-dimensional component after the flanging process comprises a flat area (4), an upper protrusion (1) arranged between two flat areas (4), and a punch supplementary surface (8) arranged at the front root of the upper protrusion (1).

6. The stamping and drawing process of the automobile load-bearing floor as claimed in claim 5, characterized in that: At least two positioning holes (11) are provided on the top surface of the upper protrusion (1).

7. The stamping and drawing process of the automobile load-bearing floor as claimed in claim 5, characterized in that: At least two through holes (12) are arranged on the front side of the upper protrusion (1).

8. The stamping and drawing process of the automobile load-bearing floor as claimed in claim 7, characterized in that: At least two reinforcing ribs (41) and at least two mounting holes (42) are arranged on each side surface of the flat area (4).

9. A stamping and drawing process for a vehicle load-bearing floor as claimed in any one of claims 1 to 8, characterized in that: The mold manufacturing steps of the upper mold, the lower mold and the blank holder ring include: S1: Set the distance between the lowest point depth of the upper die and the corresponding highest point height of the lower die to match the drawing depth of the three-dimensional component to determine the drawing depth; S2: Set a concave surface with a depth range of 10-15 mm on the upper die, match the concave surface with the convex surface of the lower die, and smooth the concave and convex surfaces; S3: Setting the outer edge range of the upper die and the corresponding lower die; S4: Use CNC machine tools to process the designed upper die, lower die and blank holder models.

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