A cold stamping manufacturing process for automobile chassis parts

Abstract

The present application discloses a cold stamping manufacturing process for automobile chassis parts, comprising the following steps: obtaining a flat blank with a positioning hole on the blank; performing a first stretching to obtain a first forming part and a second forming part connected by a curved segment; performing a second stretching so that the first forming part forms a third forming part by reducing the fillet, and the curved segment and the second forming part form a fourth forming part by middle stretching; performing a third stretching so that the third forming part and the fourth forming part form a fifth forming part and a sixth forming part respectively by increasing the height; performing punching and folding to obtain the desired control arm product. Beneficial effects of the present application: The process method of the present application can obtain a cold stamping product of a control arm that meets the quality requirements. Compared with the traditional method, it can effectively avoid cracking of the product during the stamping process, thereby effectively improving the qualified rate of the product.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts processing, and in particular to a cold stamping manufacturing process method for automobile chassis parts. Background Art

[0002] The automobile chassis consists of four parts: the transmission system, the running system, the steering system, and the braking system. The function of the chassis is to support and install the automobile engine and its components and assemblies, form the overall shape of the automobile, and receive the power of the engine to make the automobile move and ensure normal driving. Based on this, there are many parts required for the chassis; and with the development of technology, more and more automobile chassis parts have more complex product shapes and more difficult processing, and the corresponding product shape problems have also become prominent.

[0003] The control arm can guide the movement of the wheel tire, and at the same time transmit the longitudinal force, lateral force and vertical force of the tire ground to the vehicle body to keep the vehicle body stable. Figure 1 As shown, a control arm 100 which is a key component in the chassis of an automobile mainly comprises a first mounting portion 110, a second mounting portion 120 and a flange 140 extending from the sides of the first mounting portion 110 and the second mounting portion 120. Figure 2 As shown, the drawing height between the first mounting portion 110 and the second mounting portion 120 is relatively high; along the normal direction of the inclined upper end surface of the second mounting portion 120, the drawing height from the top of the first mounting portion 110 to the upper end surface of the second mounting portion 120 is X, and the value of X reaches more than 80 mm.

[0004] In the production of existing stamping process Figure 1 When the control arm product shown in FIG. 1 is formed, it is affected by the pull-out height of the first mounting portion 110 and the second mounting portion 120, such as Figure 3 As shown, the blank will be at the forming position of the flange 140, near the transition position between the first mounting portion 110 and the second mounting portion 120 ( Figure 3 There are different degrees of cracking (in the red box). That is, the existing stamping process is no longer applicable. Figure 1 The production of the control arm product; therefore, it is now urgent to improve the existing stamping process. Summary of the invention

[0005] One of the purposes of the present application is to provide a cold stamping manufacturing process method for automobile chassis parts that can solve at least one of the defects in the above-mentioned background technology.

[0006] In order to achieve at least one of the above purposes, the technical solution adopted by the present application is: a cold stamping manufacturing process method for automobile chassis parts, comprising the following specific steps:

[0007] S100: blanking the plate to obtain a flat blank, on which a positioning hole is formed;

[0008] S200: performing a first stretching on the blank based on the positioning hole to obtain a first forming part and a second forming part connected by curved surface segments;

[0009] S300: performing a second stretching on the blank after step S200, so that the first molded part is reduced by a rounded corner to form a third molded part, and at the same time, the curved surface section and the second molded part are stretched in the middle to form a fourth molded part;

[0010] S400: performing a third stretching on the blank after completing step S300, so that the third forming part and the fourth forming part are respectively formed into a fifth forming part and a sixth forming part by increasing their heights; wherein the heights of the fifth forming part and the sixth forming part are respectively equal to the heights of the first mounting part and the second mounting part;

[0011] S500: Punching and folding the blank completed in step S400 to obtain the required control arm product.

[0012] Preferably, when performing step S200, a first reference plane is formed at the bottom of the first molding part, and a radius R1 is used to transition between the bottom of the first molding part and the first reference plane, and the value of the radius R1 is 20 to 40 mm; when performing step S300, the value of the radius R1 is reduced to 10 to 15 mm to form a third molding part.

[0013] Preferably, in step S200, the height of the top of the first forming portion perpendicular to the first reference plane is set to H1, H1 = (0.4-0.6)X.

[0014] Preferably, in step S200, the second formed portion is higher than the first reference plane, and the height of the second formed portion perpendicular to the first reference plane is assumed to be H3, where H3=(0.1-0.3)X.

[0015] Preferably, in step S200, the lowest point of the curved surface segment is lower than the first reference plane, and the distance between the lowest point of the curved surface segment and the first reference plane is assumed to be H2, where H2=(0.1-0.3)X.

[0016] Preferably, when performing step 300, the first reference plane is used as the horizontal reference plane, and the middle part of the curved surface segment is stretched along the normal direction to obtain the desired fourth molded part; the fourth molded part and the third molded part are transitioned through the same fillet.

[0017] Preferably, the stretching height of the middle part of the curved surface segment along the normal direction is H4, H4=(0.4-0.5)X.

[0018] Preferably, when folding is performed in step S500, the blank is firstly cut, and then the side edges of the cut blank are folded to obtain the desired flange.

[0019] Preferably, when performing step S200, a second reference plane parallel to the first reference plane is formed on the blank; when performing the folding in step 500, the second reference plane is used as a reference.

[0020] Preferably, when performing step S200, a boss is formed near the intersection of the curved surface segment and the first forming portion, and the end surface of the boss serves as the second reference surface.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] The process method of the present application can be used to obtain a cold stamped control arm product that meets the quality requirements. Compared with the traditional method, it can effectively avoid cracking of the product during the stamping process, thereby effectively improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the shaft side structure of a control arm.

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the control arm in the front view direction.

[0025] Figure 3 To use existing stamping process Figure 1 Scrap schematic of the control arm shown.

[0026] Figure 4 It is a schematic diagram of the overall workflow of the present invention.

[0027] Figure 5 It is a schematic structural diagram of the first blank in the present invention.

[0028] Figure 6 It is a schematic diagram of the axial structure of the second blank in the present invention.

[0029] Figure 7 It is a schematic structural diagram of the front view direction of the second blank in the present invention.

[0030] Figure 8 It is a schematic structural diagram of the third blank in the present invention.

[0031] Fig. 9 It is a schematic structural diagram of the fourth blank in the present invention.

[0032] Fig.10 It is a schematic structural diagram of the fifth blank in the present invention.

[0033] Fig.11It is a schematic structural diagram of the sixth blank in the present invention.

[0034] Fig.12 It is a schematic structural diagram of the seventh blank in the present invention.

[0035] In the figure, the control arm 100, the first mounting portion 110, the first mounting hole 111, the first side hole 112, the second mounting portion 120, the second mounting hole 121, the second side hole 122, the process hole 130, the flange 140, the first blank 01, the positioning hole 001, the second blank 02, the first molding portion 021, the first side wall 0211, the first top wall 0212, the first reference surface 022, the curved surface segment 023, the boss 024, the second reference surface 0240, the second molding portion 025, the third Blank 03, third molding part 031, second side wall 0311, second top wall 0312, fourth molding part 032, third top wall 0321, third side wall 0322, first extended edge 033, fourth blank 04, fifth molding part 041, fourth side wall 0411, sixth molding part 042, fifth side wall 0421, second extended edge 043, fifth blank 05, third extended edge 051, sixth blank 06, seventh blank 07, seventh molding part 071, enlarged hole 072. DETAILED DESCRIPTION

[0036] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0039] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0040] In order to facilitate the subsequent understanding of the technical solution of this application, we can first Figure 1 and Figure 2 The control arm 100 shown is described as being manufactured using a conventional stamping process.

[0041] First, the required straight blank is punched out from a sheet of material.

[0042] Then, the straight plate blank is positioned and stretched along the middle of the blank by a punching device. The height of the stretched blank can be the same as the final product height, or a blank of corresponding height can be obtained by multiple stretching. At this time, the blank is a straight structure as a whole, and both sides of the blank along the length are left with extended edges for subsequent forming of flanges 140.

[0043] Then, the blank obtained as above is bent so that the flat structure blank is bent to obtain corresponding forming positions of the first mounting portion 110 and the second mounting portion 120, that is, an arc-shaped transition structure between the first mounting portion 110 and the second mounting portion 120 in the control arm 100 is formed, so that the drawing height of the upper end surfaces of the first mounting portion 110 and the second mounting portion 120 in the normal direction reaches the required X.

[0044] Then, the extended edges on both sides of the bent blank are folded to obtain the required flanges 140 .

[0045] Finally, the folded blank is punched to obtain the desired control arm 100 .

[0046] From the above traditional crafts, we can see that traditional crafts are Figure 1 and Figure 2 When processing the control arm 100 shown, stretching is performed first and then bending; that is, before the first mounting portion 110 and the second mounting portion 120 are bent and formed by drawing to a large height, the contours of the first mounting portion 110 and the second mounting portion 120 are stretched first. Then, when the first mounting portion 110 and the second mounting portion 120 are bent and formed by drawing to a large height, the height of the first mounting portion 110 and the second mounting portion 120 is equivalent to the thickness of the plate; from the knowledge of material mechanics, it can be known that the thicker the plate, the greater the deformation of the outer layer after the plate is bent; that is, in the product of the present application, the greater the deformation of the position used to form the subsequent flange 140, which results in the following Figure 3 The product shown in the red box is cracked.

[0047] To ensure Figure 1 and Figure 2 The control arm 100 shown can be processed properly, and one of the preferred embodiments of the present application is as follows: Figures 4 to 12 As shown, a cold stamping manufacturing process method for automobile chassis parts is provided, including the following specific process:

[0048] S100: Punching and blanking the sheet material to obtain a flat blank, on which a positioning hole 001 is formed.

[0049] S200 : performing a first stretching on the blank based on the positioning hole 001 to obtain a first molded portion 021 and a second molded portion 025 connected by a curved surface segment 023 .

[0050] S300: Performing a second stretching on the blank after completing step S200, so that the first forming portion 021 is reduced by rounding to form a third forming portion 031, and at the same time, the curved surface segment 023 and the second forming portion 025 are stretched in the middle to form a fourth forming portion 032.

[0051] S400: Perform a third stretching on the blank that has completed step S300, so that the third forming part 031 and the fourth forming part 032 are respectively formed into the fifth forming part 041 and the sixth forming part 042 by increasing the height; wherein the heights of the fifth forming part 041 and the sixth forming part 042 are respectively equal to the heights of the first mounting part 110 and the second mounting part 120.

[0052] S500: Punching and folding the blank completed in step S400 to obtain the required control arm 100 product.

[0053] It is understandable that, compared with the traditional stamping method, the stamping process method of the present application bends the flat blank during the first stretching to obtain the curved surface segment 023, and the curved surface segment 023 can be used for the subsequent forming of the inclined arc connection area between the first mounting portion 110 and the second mounting portion 120. During the first stretching, the blank is in a flat state, and the corresponding thickness of the blank is the thinnest at this time, so the deformation generated during bending is the smallest. And in the subsequent processing, it is necessary to bend the blank, and only multiple stretchings are required to obtain the desired control arm 100 product. Compared with the traditional method, the present application can effectively avoid the cracking of the blank during the processing, thereby effectively improving the qualified rate of the product.

[0054] For ease of understanding, each process step will be described in detail below.

[0055] 1. Blanking process, namely the above-mentioned step S100.

[0056] like Figure 4 and Figure 5 As shown, the sheet material is punched out by a punching device to obtain a first blank 01 having a contour and a size adapted to the desired control arm 100. The overall size of the first blank 01 is slightly larger than the unfolded size of the control arm 100 to ensure sufficient processing margin. The first blank 01 can also be punched out with a positioning hole 001 to facilitate positioning of the first blank 01 in the subsequent process, thereby improving the processing accuracy of subsequent products. Among them, the specific structure and working principle of the punching device are well-known technologies for those skilled in the art, so they will not be elaborated in detail here.

[0057] 2. The first stretching process, namely the above-mentioned step S200.

[0058] like Figure 4 , Figure 6 and Figure 7 As shown, the first blank 01 is positioned on the fixture through the positioning hole 001, and then the first blank 01 is stretched by the stamping equipment to obtain the second blank 02. The second blank 02 includes a first forming part 021, a first reference surface 022, a curved surface section 023, a boss 024 and a second forming part 025. The first forming part 021 and the second forming part 025 are transitionally connected through the curved surface section 023; the first reference surface 022 is located at the bottom of the first forming part 021, which can be used as a reference surface for subsequent processing steps, and is also the part to be formed required for the subsequent processing of the first mounting part 110; the curved surface section 023 and the second forming part 025 are used together as the part to be formed for the subsequent processing of the second mounting part 120. The boss 024 can be used as a reference for subsequent processes. Among them, the first forming part 021 is a convex structure, the curved surface section 023 is a curved surface structure, and the second forming part 025 is still a plate-like structure as a whole, but only a part of the concave-convex structure on the second mounting part 120 is processed.

[0059] In this process, if Figure 6 and Figure 7 As shown, the first reference plane 022 can be set as a horizontal reference plane. Then, when performing the first stretching, the stretching height of the first forming portion 021 can be defined as: the height H1 from the top of the first forming portion 021 to the first reference plane 022 in a direction perpendicular to the first reference plane 022; the value of the height H1 can be H1=(0.4~0.6)X.

[0060] It should be known that, for the molding of the first molding part 021, if the molding height of the first molding part 021 is too high, the first reference surface 022 will not be formed, or the area of ​​the formed first reference surface 022 is very small and cannot meet the subsequent reference processing requirements. In addition, when the first molding part 021 is too high, in theory, the curved surface section 023 near the first molding part 021 will be bent downward, but during the first stretching, in order to ensure the molding quality of the curved surface section 023, the bending of the entire curved surface section 023 will be restricted, that is, the stamping equipment will be provided with a cavity corresponding to the structure and size of the curved surface section 023, and the cavity will restrict the curved surface section 023 from performing actions beyond the process limit, which will cause the connection between the first molding part 021 and the curved surface section 023 to be torn; therefore, in this process, the stretching height of the first molding part 021 is not easy to be too high.

[0061] If the stretching height of the first forming part 021 is too low, then more stretching may be required to complete the forming of the first mounting part 110, so the stretching degree of the first forming part 021 should not be too low. In summary, in this process, the stretching height H1 of the first forming part 021 can be set to (0.4-0.6)X. In a specific example, the value of X can be set to 86.6mm and the value of H1 can be set to 40mm.

[0062] In this process, if Figure 6 and Figure 7 As shown, the second molded portion 025 is higher than the first reference plane 022, that is, the highest point of the curved segment 023 is higher than the first reference plane 022; the lowest point of the curved segment 023 is lower than the first reference plane 022. Therefore, the curved segment 023 obtained by the first stretching can basically meet the subsequent inclined arc transition requirements between the first mounting portion 110 and the second mounting portion 120.

[0063] It is understandable that, during the first stretching, that is, by bending the plate-shaped first blank 01 to obtain the required curved surface segment 023, the influence on the performance of the material is minimal. Therefore, during the first stretching, the arc profile of the curved surface segment 023 can be bent into the profile shape required for the transition between the first mounting portion 110 and the second mounting portion 120 in the control arm 100, or relatively close. Then, in the subsequent stretching process, there is no need or only a slight bending process is required for the corresponding position of the curved surface segment 023 to obtain the transition profile of the first mounting portion 110 and the second mounting portion 120 required by the product. The structural strength and structural performance of the material can be effectively improved, thereby ensuring that the product will not crack and improve the qualified rate.

[0064] Specifically, assuming that the height of the second forming portion 025 perpendicular to the first reference plane 022 is H3, and the distance between the lowest point of the curved surface segment 023 and the first reference plane 022 is H2; then H2 = (0.1-0.3)X, H3 = (0.1-0.3)X. Taking the aforementioned X = 86.6mm as an example, the value ranges of H2 and H3 are both 8.66-26mm; as a preferred embodiment, H2 = 20mm, H3 = 15mm can be selected.

[0065] In this process, if Figure 6 As shown, the first molding part 021 includes a first side wall 0211 and a first top wall 0212; the first side wall 0211 is a pair, the lower end of the first side wall 0211 is connected to the first reference surface 022 through a rounded corner R1, and the upper end of the first side wall 0211 is connected to the first top wall 0212 through a rounded corner R2. The arrangement of the rounded corners R1 and R2 can facilitate the molding of the first molding part 021, and can also facilitate subsequent processing steps.

[0066] 3. The second stretching process, namely the above-mentioned step S300.

[0067] like Figure 4 and Figure 8 As shown, the second blank 02 is positioned and placed in the fixture through the first reference surface 022 and the positioning hole 001, and then the second blank 02 is stretched by the stamping equipment to obtain the third blank 03. The third blank 03 includes a third forming portion 031, a fourth forming portion 032 and a first extension edge 033. The third forming portion 031 is substantially identical to the upper half of the first mounting portion 110, the fourth forming portion 032 is substantially identical to the upper half of the second mounting portion 120, and the first extension edge 033 is located at the bottom of the third forming portion 031 and the fourth forming portion 032 and serves as a portion to be formed for subsequent processing.

[0068] It is understandable that when forming the third forming part 031, the stamping equipment can reduce the fillets R1 and R2 on the first forming part 021 to obtain the desired third forming part 031. Generally speaking, when performing the first stretching, the value of the fillet R1 is 20 to 40 mm, and the value of the fillet R2 is 10 to 20 mm; then when performing the second stretching, the value of the fillet R1 can be reduced to 10 to 15 mm, and the value of the fillet R2 can be reduced to 6 to 15 mm. Then, by reducing the fillets R1 and R2, the first forming part 021 is shaped to obtain the third forming part 031, and by setting the fillets in advance to stretch by reducing the size, the stress concentration at the stretching position can be effectively reduced, thereby avoiding the fillet position from being torn to improve the stretching quality of the product. In one specific example, the value of the fillet R1 obtained after the first stretching is 30 mm, and the value of the fillet R2 is 15 mm, and thus the value of the fillet R1 obtained after the second stretching is 12 mm, and the value of the fillet R2 is 12 mm.

[0069] Specifically, Figure 8 As shown, the third molded portion 031 includes a second side wall 0311 and a second top wall 0312. The area of ​​the second side wall 0311 is larger than that of the first side wall 0211, and the area of ​​the second top wall 0312 is larger than that of the first top wall 0212. There are two second side walls 0311, and the lower end of the second side wall 0311 is connected to the first extension edge 033 through the reduced fillet R1, and the upper end of the second side wall 0311 is connected to the second top wall 0312 through the reduced fillet R2. The height of the third molded portion 031 is slightly higher than that of the first molded portion 021.

[0070] It can also be understood that the fourth molded portion 032 is formed by stretching the curved surface segment 023 and the second molded portion 025 through the convex stretching in the middle. There are many specific convex stretching methods, and one specific example is that the first reference plane 022 is used as the horizontal reference plane, and the middle of the curved surface segment 023 and the second molded portion 025 is stretched along the normal direction to obtain the desired fourth molded portion 032; the fourth molded portion 032 and the third molded portion 031 are transitioned through the same fillet.

[0071] It should be known that the second forming portion 025 is a plane parallel to the first reference plane 022, so the stretching of the second forming portion 025 is vertically upward. For the curved surface segment 023, it is a curved surface and inclined surface structure, so the stretching direction of each position of the curved surface segment 023 is different, but all along the normal direction of the corresponding stretching point. The first extended edge 033 obtained after stretching is not a straight structure, but an arc structure.

[0072] Specifically, Figure 8As shown, the stretching height of the fourth forming portion 032 can be set to H4, that is, when the second stretching is performed, the curved surface segment 023 and the middle part of the second forming portion 025 can be stretched to a height of H4 along the normal direction. The value of the height H4 can be H4 = (0.4-0.5) X. Taking the above X = 86.6 mm as an example, H4 = 34.6-43 mm; as a preferred embodiment, H4 = 39 mm can be selected.

[0073] More specifically, Figure 8 As shown, the fourth molded portion 032 includes a third side wall 0322 and a third top wall 0321, the third top wall 0321 corresponds to the middle area of ​​the curved surface segment 023 and the second molded portion 025, the third side wall 0322 has two sides corresponding to the two side areas of the curved surface segment 023 and the second molded portion 025, and the positioning hole 001 is located in the rear area of ​​the third top wall 0321. The lower end of the third side wall 0322 is connected to the first extended edge 033 through the reduced fillet R1, and the upper end of the third side wall 0322 is connected to the third top wall 0321 through the reduced fillet R2.

[0074] 4. The third stretching process, namely the above-mentioned step S400.

[0075] As can be seen from the above, during the first stretching process, a boss 024 is formed on the second blank 02, and the upper end surface of the boss 024 can be parallel to the first reference surface 022 to form a second reference surface 0240. During the second stretching process, since the first reference surface 022 has been stretched to form a part of the first extended edge 033 in the form of a curved surface, the stretching is performed based on the second reference surface 0240 in the third stretching process.

[0076] like Figure 4 and Fig. 9 As shown, the third blank 03 is positioned on the fixture through the second reference surface 0240 and the positioning hole 001, and then the third blank 03 is stretched by a stamping device to obtain a fourth blank 04. The fourth blank 04 includes a fifth forming portion 041, a sixth forming portion 042 and a second extension edge 043. The third forming portion 031 is stretched to increase the height to obtain the fifth forming portion 041, and the height and contour shape of the fifth forming portion 041 are basically consistent with the first mounting portion 110; the fourth forming portion 032 is stretched to increase the height to obtain the sixth forming portion 042, and the height and contour shape of the sixth forming portion 042 are basically consistent with the second mounting portion 120.

[0077] Specifically, Fig. 9As shown, the fifth molded portion 041 includes a fourth side wall 0411 and a second top wall 0312. The corresponding fourth side wall 0411 is obtained by stretching the second side wall 0311 by reducing the fillet R1 and shortening the first extension edge 033, the upper end of the fourth side wall 0411 is connected to the second top wall 0312 through the fillet R2 of unchanged size, and the lower end of the fourth side wall 0411 is connected to the second extension edge 043 through the fillet R1 of reduced size.

[0078] Specifically, Fig. 9 As shown, the sixth molded portion 042 includes a fifth side wall 0421 and a third top wall 0321. The corresponding fifth side wall 0421 is obtained by stretching the third side wall 0322 by reducing the fillet R1 and shortening the first extension edge 033. The upper end of the fifth side wall 0421 is connected to the second top wall 0312 through the fillet R2 with unchanged size, and the lower end of the fifth side wall 0421 is connected to the second extension edge 043 through the fillet R1 with reduced size.

[0079] It should be known that the fillet R1 after the third stretching process is equal to the fillet value of the corresponding position in the control arm 100 , and the value of the fillet R1 may be 5 mm.

[0080] It should also be known that, in order to ensure the reference accuracy of the second reference surface 0240 in the subsequent processing steps, the forming position of the boss 024 may not be affected in the second stretching and third stretching steps; therefore, the boss 024 may be formed in the middle area of ​​the curved surface segment 023. In a specific example, during the first stretching step, the boss 024 is formed near the intersection of the curved surface segment 023 and the first forming portion 021, that is, the boss 024 is formed near the lowest point of the curved surface segment 023.

[0081] 5. Cutting process, which is a part of the above step S500.

[0082] It can be seen from the aforementioned blanking process that in order to ensure the molding quality of the product, the outline size of the first blank 01 is slightly larger than the actual unfolded size of the control arm 100; that is, the width of the second extended edge 043 obtained after completing the third stretching process is slightly larger than the unfolded width of the flange 140, so before processing the flange 140, the excess sheet material of the second extended edge 043 needs to be cut off.

[0083] like Figure 4 and Fig.10As shown, the fourth blank 04 is positioned on the fixture through the second reference surface 0240 and the positioning hole 001, and then the fourth blank 04 is punched out by a stamping device to obtain a fifth blank 05. The fifth blank 05 includes a fifth forming portion 041, a sixth forming portion 042 and a third extension edge 051. That is, the difference between the fifth blank 05 and the fourth blank 04 is that the second extension edge 043 is cut to obtain the third extension edge 051.

[0084] 6. Bending process, which is a part of the above step S500.

[0085] like Figure 4 and Fig.11 As shown, the fifth blank 05 is positioned on the fixture through the second reference surface 0240 and the positioning hole 001, and then the fifth blank 05 is bent by a stamping device to obtain the sixth blank 06. The sixth blank 06 includes a fifth forming portion 041, a sixth forming portion 042 and a flange 140.

[0086] It should be known that Figure 1 and Figure 2 As shown, the first mounting portion 110 is provided with a through first mounting hole 111, the second mounting portion 120 is provided with a through second mounting hole 121, and the first mounting portion 110 and the second mounting portion 120 are also provided with through first side holes 112 and second side holes 122, respectively. In addition, the positioning hole 001 also needs to be processed into a process hole 130. Based on the above-mentioned hole processing, it is necessary to proceed step by step to ensure that the blank can be stably positioned.

[0087] 7. The first punching process.

[0088] like Figure 4 and Fig.12 As shown, the sixth blank 06 is positioned on the fixture through the middle area of ​​the fifth forming part 041 and the sixth forming part 042, and then the sixth blank 06 is punched by a stamping device to obtain the seventh blank 07. The seventh blank 07 includes the fifth forming part 041, the flange 140 and the seventh forming part 071. Among them, the seventh forming part 071 is basically the same as the sixth forming part 042 in terms of contour shape, and the difference is that the second mounting hole 121 is formed on the seventh forming part 071, and the positioning hole 001 is enlarged to obtain the enlarged hole 072. At the same time, the first side hole 112 can also be formed on the side of the fifth forming part 041.

[0089] 8. The second punching process.

[0090] As 1 and Figure 4As shown, the seventh blank 07 is positioned on the fixture through the seventh forming part 071, and then the fifth forming part 041 on the seventh blank 07 is punched by a stamping device, and the side of the enlarged hole 072 is folded to obtain the required control arm 100. That is, the first mounting hole 111 is formed on the fifth forming part 041 to form the first mounting part 110, the second side hole 122 is formed on the seventh forming part 071, and the enlarged hole 072 is folded into a process hole 130 to form the second mounting part 120.

[0091] In the present application, the specific structure and working principle of the stamping equipment and the corresponding clamps used in the above-mentioned process are well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0092] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A cold stamping manufacturing process for automobile chassis parts, characterized in that: The steps include: S100: blanking the plate to obtain a flat blank, on which a positioning hole is formed; S200: performing a first stretching on the blank based on the positioning hole to obtain a first forming part and a second forming part connected by curved surface segments; S300: performing a second stretching on the blank after step S200, so that the first molded part is reduced by a rounded corner to form a third molded part, and at the same time, the curved surface section and the second molded part are stretched in the middle to form a fourth molded part; S400: performing a third stretching on the blank after completing step S300, so that the third forming part and the fourth forming part are respectively formed into a fifth forming part and a sixth forming part by increasing their heights; wherein the heights of the fifth forming part and the sixth forming part are respectively equal to the heights of the first mounting part and the second mounting part; S500: Punching and folding the blank completed in step S400 to obtain the desired control arm product; When performing step S200, a first reference surface is formed at the bottom of the first forming portion, the first forming portion includes a first side wall and a first top wall, the bottom of the first side wall and the first reference surface are transitioned through a fillet R1, and the upper end of the first side wall is connected to the first top wall through a fillet R2; the value of the fillet R1 is 20-40 mm, and the value of the fillet R2 is 10-20 mm; when performing step S300, the value of the fillet R1 is reduced to 10-15 mm to form a third forming portion, and the value of the fillet R2 is reduced to 6-15 mm; In step S200, the height of the top of the first forming portion perpendicular to the first reference plane is set to H1, H1=(0.4~0.6)X; In step S200, the second forming part is higher than the first reference plane, and the height of the second forming part perpendicular to the first reference plane is set to H3, H3=(0.1~0.3)X; In step S200, the lowest point of the curved surface segment is lower than the first reference plane, and the distance between the lowest point of the curved surface segment and the first reference plane is set to H2, H2=(0.1~0.3)X; When performing step 300, the first reference plane is used as the horizontal reference plane, and the middle part of the curved surface segment is stretched along the normal direction to obtain the desired fourth formed part; the fourth formed part and the third formed part are transitioned by the same fillet; Assume that the stretching height of the middle part of the surface segment along the normal direction is H4, H4=(0.4~0.5)X; Wherein, X represents the drawing height of the upper end surfaces of the first mounting portion and the second mounting portion in the normal direction.

2. The cold stamping manufacturing process of automobile chassis parts according to claim 1, characterized in that: When folding is performed in step S500, the blank is firstly cut, and then the side edge of the cut blank is folded to obtain the desired flange.

3. The cold stamping manufacturing process of automobile chassis parts according to claim 2, characterized in that: When performing step S200 , a second reference surface parallel to the first reference surface is formed on the blank; when performing the folding in step 500 , the second reference surface is used as a reference.

4. The cold stamping manufacturing process of automobile chassis parts according to claim 3, characterized in that: When performing step S200 , a boss is formed near the intersection of the curved surface segment and the first forming portion, and the end surface of the boss serves as the second reference surface.

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