Slitting and flanging composite die structure suitable for automobile sheet part

Abstract

The utility model discloses a slitting and flanging composite die structure suitable for an automobile sheet part, which comprises a lower die assembly, a lower die assembly, an upper die assembly and a lower die assembly, and the lower die assembly comprises a lower die seat, a lower die cutter block fixed on the lower die seat and a piece supporting device elastically connected to the lower die seat; the upper end faces of the lower die base, the lower die cutter block and the part supporting device are flush to form a part containing face. The upper die assembly comprises an upper die base, a first pressing device elastically connected to the upper die base and an upper die cutter block detachably connected to the upper die base. Wherein the pre-pressing device is used for pressing the front section of the automobile part; a slitting cutting edge and a flanging face which correspond to a flanging opening of the workpiece supporting device are formed on the lower end face of the upper die cutter block. According to the technical scheme, the slitting and flanging device is simple in structure, easy to implement and low in cost, slitting and flanging of the automobile sheet part can be synchronously completed in one set of die, and the problems that due to the fact that an existing automobile sheet part is machined in a multi-die operation mode, operation efficiency is low, and hidden danger exists in production quality are solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive mold manufacturing technology, specifically to a composite mold structure for slitting and flanging of thin automotive sheet metal parts. Background Technology

[0002] In the manufacturing process of thin sheet metal parts for automobiles, the cutting and flanging of thin sheet metal parts are key processes in the stamping process, which directly affect the assembly accuracy of the car body and the appearance of the product.

[0003] Traditional processing methods generally employ a process route where slitting dies and flanging dies are processed independently. Current improvements to these dies primarily focus on optimizing single processes (such as increasing cutting edge life and controlling flanging angles), while neglecting the following problems: First, the separate dies processing relies heavily on manual handling, making it unsuitable for automated production lines, hindering capacity increases, and resulting in low efficiency. Second, there are potential quality risks; multiple positioning of parts on the dies often causes flanging dimension deviations, affecting assembly accuracy. Furthermore, positioning errors can easily lead to wrinkles on the parts, severely damaging the product's appearance and increasing rework costs. Third, costs are high; multiple processes require multiple people and multiple sets of dies, resulting in high equipment and maintenance costs, and increased labor costs.

[0004] Given the shortcomings of the existing technology, the existing mold structure needs further optimization and improvement. Utility Model Content

[0005] This utility model provides a composite mold structure for slitting and flanging of thin automotive sheet metal parts. Its structure is simple, easy to implement, and low in cost. It can simultaneously complete the slitting and flanging of thin automotive sheet metal parts within a single mold, solving the problems of low operating efficiency and potential quality issues caused by the existing multi-mold processing method for thin automotive sheet metal parts. The main technical solution adopted is as follows:

[0006] A composite mold structure for slitting and flanging of thin automotive sheet metal parts includes: a lower mold assembly comprising a lower mold base, a lower mold cutter block fixed to the lower mold base, and a part holder elastically connected to the lower mold base; the upper end faces of the lower mold base, the lower mold cutter block, and the part holder are flush to form a part placement surface; an upper mold assembly comprising an upper mold base, a pre-pressor elastically connected to the upper mold base, and an upper mold cutter block detachably mounted to the upper mold base; wherein the pre-pressor is used to press the front section of the automotive part; the lower end face of the upper mold cutter block forms a slitting cutting edge and a flanging surface corresponding to the flanging opening of the part holder; the slitting cutting edge... The part is protruding towards the part placement surface; the flanged surface is an arc-shaped surface that continuously transitions with the cutting edge; the upper end face of the lower die block is provided with a shearing edge for forming a shearing engagement with the cutting edge, the shearing edge is located adjacent to the flanged opening and forms a forming space to accommodate the flanged deformation of the part; the shearing edge and the flanged opening are located between the lower die block and the support; when the upper die assembly moves downward, the pre-pressor presses the front section of the part, the flanged surface of the upper die block squeezes the part to complete the flange, and the cutting edge and the shearing edge shear engage to cut the part into a front section and a rear section.

[0007] Preferably, the part holder is elastically connected to the lower mold base via a first guide post and a first spring, wherein the axis of the first guide post is perpendicular to the part placement surface.

[0008] Preferably, the pre-pressor is elastically connected to the upper mold base via a second guide post and a second spring; the axis of the second guide post is perpendicular to the part placement surface, and the compression stroke of the second spring is greater than the compression stroke of the first spring.

[0009] Preferably, both the first spring and the second spring are configured as nitrogen springs.

[0010] Preferably, the upper die block includes a base and a cutting edge, with the cutting edge formed below the base; the slitting edge and the flange are formed on the cutting edge.

[0011] Preferably, the upper die cutter block is arranged in an "L" shape, the base is configured as a horizontal section, and the cutting edge is configured as a vertical section; the horizontal section is used to connect with the upper die base, and the vertical section forms the cutting edge and the flange surface.

[0012] Preferably, it also includes two sets of material support frames for supporting the two sides of the part respectively. The two sets of material support frames are symmetrically arranged on both sides of the lower mold base, and the material support surface on the two sets of material support frames is flush with the part placement surface.

[0013] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0014] (1) This utility model provides a composite mold structure for slitting and flanging of thin automotive sheet metal parts. Its structure is simple, easy to implement, and low in cost. It can simultaneously complete the slitting and flanging of thin automotive sheet metal parts within a single mold, solving the problems of low operating efficiency and potential quality issues caused by the existing multi-mold processing method for thin automotive sheet metal parts. In this utility model, the composite mold integrates the slitting blade and the flanging surface into the upper mold blade block, and coordinates with the shearing blade of the lower mold blade block to achieve simultaneous completion of the slitting and flanging processes. Therefore, this composite mold can effectively ensure flanging accuracy with a single positioning, avoiding positioning errors and part deformation caused by multiple handling in traditional processes, significantly improving production efficiency and product quality, while reducing the number of processes and labor costs.

[0015] (2) In this technical solution, the support device is elastically connected to the lower mold base through the first guide post and the first spring. It can provide stable support during cutting and reduce the rigid impact on the parts through elastic buffering during the flanging process, preventing scratches or excessive wrinkles on the surface of the parts. At the same time, it ensures that the support device automatically resets after cutting, improving the continuity of mold action, and eliminating the need for subsequent re-adjustment.

[0016] (3) In this technical solution, the pre-pressor is elastically connected to the upper mold base through the second guide post and the second spring, and the compression stroke of the second spring is greater than that of the first spring, so as to ensure that the pre-pressor can always act on the front part of the part through the elastic pressing force during the flanging and cutting process, further effectively preventing the part from deforming and wrinkling, and ensuring the processing accuracy.

[0017] (4) In this technical solution, the upper mold base and the upper mold blade block are separate and detachable fixed structures, which facilitates the replacement or re-grinding of the blade block and reduces maintenance costs; that is, the cutting edge and the flange are concentrated on the blade block of the upper mold blade block, and the upper mold blade block can be flexibly adjusted and replaced according to the needs of different parts, thereby improving the versatility of the mold.

[0018] (5) In this technical solution, the symmetrically arranged material support rack is flush with the part placement surface, which can provide uniform support on both sides of the part at the same horizontal plane, quickly complete the planar positioning of the part, and further ensure the positional accuracy of cutting and flanging. This arrangement of the material support rack is especially suitable for the processing of ultra-large automotive thin plate parts. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an overall structural diagram of an embodiment of the present utility model;

[0021] Figure 2 This is a structural diagram showing the product parts placed in the lower mold base according to an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the cutting edge and shearing edge before they are engaged in shearing, according to an embodiment of this utility model.

[0023] Figure 4 for Figure 3 A magnified view of part C shown;

[0024] Figure 5 This is a schematic diagram of the structure of the slitting blade and the shearing blade before they are engaged in shearing, according to an embodiment of this utility model.

[0025] Figure 6 This is a cross-sectional view of the cutting edge and shearing edge in a cutting engagement according to an embodiment of the present invention;

[0026] Figure 7 for Figure 6 A magnified view of part D shown;

[0027] Figure 8 This is a schematic diagram of the structure of the cutting edge and the shearing edge in the shearing engagement according to an embodiment of the present invention;

[0028] Figure 9 This is a cross-sectional view of the cutting edge and shearing edge after shearing engagement according to an embodiment of the present invention;

[0029] Figure 10 for Figure 9 A magnified view of part E shown;

[0030] Figure 11 This is a schematic diagram of the structure after the cutting edge and the shearing edge of this utility model are engaged in shearing.

[0031] The annotations in the attached figures are explained as follows:

[0032] 1. Lower mold assembly; 11. Lower mold base; 12. Lower mold cutter block; 12a. Shearing blade; 13. Part holder;

[0033] 13a. Flanged edge;

[0034] 2. Upper mold assembly; 21. Upper mold base; 22. Pre-pressor; 23. Upper mold blade block; 23a. Cutting edge; 23b. Flanged surface; 231. Base; 232. Blade block; 5. Material support frame; A. Forming space; B. Parts. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0036] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0037] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0038] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0039] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0040] Please see Figures 1 to 11 .

[0041] This embodiment provides a composite mold structure for slitting and flanging of thin automotive sheet metal parts. The structure is simple, easy to implement, and low-cost. It can simultaneously complete the slitting and flanging of thin automotive sheet metal parts B within a single mold, solving the problems of low operating efficiency and potential quality issues associated with the existing multi-mold processing method for thin automotive sheet metal parts B. Figure 1 The composite mold structure in this embodiment is mainly suitable for thin-plate automotive parts B. The mold includes a lower mold assembly 1, an upper mold assembly 2, and two sets of material support frames 5; wherein,

[0042] The lower mold assembly 1 includes a lower mold base 11, a lower mold cutter block 12 fixed to the lower mold base 11, and a part holder 13 elastically connected to the lower mold base 11. The upper surfaces of the lower mold base 11, the lower mold cutter block 12, and the part holder 13 are flush to form the placement surface of part B. Two sets of material support frames 5 are symmetrically arranged on both sides of the lower mold base 11, and the material support surfaces on the two sets of material support frames 5 are flush with the placement surface of part B. Referring to 2, when the automotive sheet metal part B is positioned in the composite mold, it will be balanced above the two sets of material support frames 5 and part B without tilting. The material support frame 5 can also constrain and position part B to prevent part B from shifting on the placement surface of part B.

[0043] In this embodiment, the lower die base 11 is fixedly installed on the press worktable; the lower die cutter block 12 is detachably fixedly connected to the position of the lower die by bolts; the part holder 13 is elastically connected to the lower die base 11 by a first guide post (not shown) and a first spring (not shown), the axis of the first guide post is perpendicular to the placement surface of part B, so that the part holder 13 can move stably in the vertical direction relative to the horizontal plane; wherein, the lower die and the part holder 13 are arranged side by side, and the lower die cutter block 12 is located between the lower die and the part holder 13.

[0044] The upper die assembly 2 includes an upper die base 21 fixedly mounted on the press slide, a pre-pressor 22 elastically connected to the upper die base 21, and an upper die cutter block 23 detachably fixed to the upper die base 21 by bolts. The pre-pressor 22 is used to press the front section of the automotive part B; the pre-pressor 22 is elastically connected to the upper die base 21 through a second guide post (not shown) and a second spring (not shown), the axis of the second guide post is perpendicular to the placement surface of part B, and the compression stroke of the second spring is greater than the compression stroke of the first spring.

[0045] In this embodiment, see Figure 3 Enlarged view of a part Figure 4 The lower end face of the upper die cutter block 23 has a cutting edge 23a and a flanged surface 23b corresponding to the flanged opening 13a of the support 13; the cutting edge 23a protrudes towards the placement surface of part B; the flanged surface 23b is an arc-shaped surface that continuously transitions with the cutting edge 23a; the upper end face of the lower die cutter block 12 has a shearing edge 12a for forming a shearing engagement with the cutting edge 23a, the shearing edge 12a is located adjacent to the flanged opening 13a and forms a forming space A corresponding to it for accommodating the flanged deformation of part B; the shearing edge 12a and the flanged opening 13a are located between the lower die cutter block 12 and the support 13. For details, please refer to [reference needed]. Figures 3 to 11 When the upper die assembly 2 moves downward, the pressure plate 22 can press the front section of part B, the flanged surface 23b of the upper die block 23 squeezes part B to complete the flange, and the cutting edge 23a and the shearing edge 12a cooperate to cut part B into front and rear sections.

[0046] In this embodiment, both the first and second springs are configured as nitrogen springs. Using nitrogen springs instead of traditional mechanical springs offers faster response and constant pressure, providing stable elastic force during high-speed stamping, avoiding pressure fluctuations caused by spring fatigue, extending mold life, and adapting to the high-frequency production requirements of the subsequent automated production line of this composite mold. Furthermore, the support 13 is elastically connected to the lower mold base 11 via the first guide post and the first spring, providing stable support during slitting and reducing rigid impact on part B during flanging through elastic buffering, preventing scratches or excessive wrinkles on the surface of part B. It also ensures that the support 13 automatically resets after slitting, improving the continuity of mold operation and eliminating the need for subsequent readjustment. The pre-pressor 22 is elastically connected to the upper mold base 21 via the second guide post and the second spring, with the second spring having a greater compression stroke than the first spring. This ensures that the pre-pressor 22 consistently applies elastic clamping force to the front section of part B during flanging and slitting, further effectively preventing deformation and wrinkling of part B and ensuring processing accuracy.

[0047] In this embodiment, the upper die cutter block 23 includes a base 231 and a cutting edge 232, with the cutting edge 232 forming below the base 231; the cutting edge 23a and the flanged surface 23b are formed on the cutting edge 232. Furthermore, since the upper die base 21 and the upper die cutter block 23 are detachable and fixed structures, the upper die base 21 and the upper die cutter block 23 are separate structures. This makes it easy to replace or re-grind the cutting edge 232 on the upper die cutter block 23, reducing maintenance costs; that is, the cutting edge 23a and the flanged surface 23b are concentrated on the cutting edge 232 of the upper die cutter block 23, and the upper die cutter block 23 can be flexibly adjusted and replaced according to the needs of different parts B, improving the versatility of the mold.

[0048] In this embodiment, see Figure 3 , 6 9. The upper die cutter block 23 is L-shaped, with the base 231 configured as a horizontal segment and the cutting edge 232 configured as a vertical segment. The horizontal segment is used to connect with the upper die base 21, and the vertical segment forms the cutting edge 23a and the flange surface 23b. Furthermore, the horizontal segment structure allows for a larger contact area between the base 231 and the upper die base 21, resulting in a more uniform and stable interaction force. The cutting edge 232, being a vertical segment, is designed to coincide with the vertical direction of the surface where part B is placed, ensuring better cutting performance and precise shearing engagement with the cutting edge 12a on the lower die cutter block 12. Finally, the clearly defined horizontal and vertical segment structure simplifies and directly reduces processing costs by eliminating the need for complex curved surface designs.

[0049] The working principle and usage process of this utility model:

[0050] See Figure 1 The composite mold is in its initial state; control the press slide to move upward and open the upper mold base 21.

[0051] See Figure 2 Part B is placed on the part B placement surface of the lower mold base 11; at the same time, the two sets of material support frames 5 at the left and right ends of the lower mold base 11 also support the two sides of part B respectively, so as to achieve uniform support of the entire part B on the same horizontal plane, quickly complete the planar positioning of part B, and prevent part B from tilting.

[0052] See also Figures 3 to 5 When the press is started, the press slide moves the upper mold base 21 downward in the first step. The lower end face of the presser 22, the lower mold base 11 and the upper end face of the lower mold cutter block 12 on the lower mold base 11, together press the front part of the car part B in advance to prevent the front part of the part B from moving. At the same time, the cutting edge 232 of the upper mold cutter block 23 also gradually approaches the surface of the part B.

[0053] See also Figures 6 to 8 As the press slide moves the upper die holder 21 downwards in the second step, the cutting edge 232 of the upper die block 23 acts on the middle position of part B, and at the same time, the flange surface 23b of the upper die block 23 acts on the rear section of part B, pressing it against the flange opening 13a of the support 13. At this time, due to the driving action of the cutting edge 232, the cutting edge 232 will drive the edge of the front section of part B to gradually begin to flange and deform in the forming space A above the shearing edge 12a of the lower die block 12.

[0054] See also Figures 9 to 11As the press slide moves the upper die holder 21 downwards in the third step, the upper die cutter block 23 presses the rear section of part B against the flange opening 13a of the support 13 and continues to move downwards. The cutting edge block 232 and the shearing edge 12a of the lower die cutter block 12 shear together to form a misaligned shear difference, cutting part B into the front and rear sections. At the same time, during the cutting process, the front section of part B completes flange opening in the forming space A, and the rear section of part B also completes flange opening under the action of the flange opening 13a and flange surface 23b of the support 13. As it continues to move downwards, the front and rear sections of part B are completely cut. Finally, after the part B is cut, the press slide can be controlled to move upwards. The front and rear sections of part B, after being cut, will not tilt or shift under the action of the part B placement surface and the two side support frames 5. At this time, part B can be taken out by an external robot or manually. The entire loading and unloading process and the operation of the mold can be automated. Therefore, this utility model has a simple structure, is easy to implement, and has low cost. It can simultaneously complete the slitting and flanging of automotive sheet metal parts B within a single mold, solving the problems of low operating efficiency and potential quality issues caused by the existing multi-mold processing method for automotive sheet metal parts B. In this utility model, the composite mold integrates the slitting cutting edge 23a and the flanging surface 23b into the upper mold blade block 23, and coordinates with the shearing cutting edge 12a of the lower mold blade block 12 to achieve simultaneous completion of the slitting and flanging processes. Therefore, this composite mold can effectively ensure flanging accuracy with a single positioning, avoiding positioning errors and part B deformation caused by multiple handling in traditional processes, significantly improving production efficiency and product quality, while reducing the number of processes and labor costs.

[0055] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A composite mold structure for slitting and flanging of thin sheet metal parts for automobiles, characterized in that: include: The lower mold assembly includes a lower mold base, a lower mold cutter block fixed to the lower mold base, and a part holder elastically connected to the lower mold base; the upper surfaces of the lower mold base, the lower mold cutter block, and the part holder are flush to form a part placement surface; the upper mold assembly includes an upper mold base, a pre-pressor elastically connected to the upper mold base, and an upper mold cutter block detachably mounted to the upper mold base; wherein, the pre-pressor is used to press the front section of the automotive part; The lower end face of the upper die block is formed with a cutting edge and a flanged surface corresponding to the flanged opening of the part holder; the cutting edge protrudes towards the part placement surface; the flanged surface is an arc-shaped surface that continuously transitions with the cutting edge; The upper end face of the lower die block is provided with a shearing edge for forming a shearing engagement with the cutting edge. The shearing edge is located on the adjacent side of the flange opening and forms a forming space to accommodate the flange deformation of the part. The shearing edge and the flange opening are located between the lower die block and the support. When the upper die assembly moves downward, the pre-pressor presses the front section of the part, the flanged surface of the upper die block squeezes the part to complete the flange, and the cutting edge and shearing edge work together to cut the part into the front section and the rear section.

2. The composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 1, characterized in that: The part holder is elastically connected to the lower mold base via a first guide post and a first spring, with the axis of the first guide post perpendicular to the part placement surface.

3. The composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 2, characterized in that: The pre-pressor is elastically connected to the upper mold base via a second guide post and a second spring; the axis of the second guide post is perpendicular to the part placement surface, and the compression stroke of the second spring is greater than that of the first spring.

4. The composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 3, characterized in that: Both the first spring and the second spring are configured as nitrogen springs.

5. The composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 1, characterized in that: The upper die block includes a base and a cutting edge, with the cutting edge forming below the base; the slitting edge and the flange are formed on the cutting edge.

6. The composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 5, characterized in that: The upper die block is arranged in an "L" shape, the base is configured as a horizontal section, and the cutting edge is configured as a vertical section; the horizontal section is used to connect with the upper die base, and the vertical section forms the cutting edge and the flange surface.

7. A composite mold structure for slitting and flanging of thin automotive sheet metal parts as described in claim 1. Its features are: It also includes two sets of material support frames for supporting the two sides of the part respectively. The two sets of material support frames are symmetrically arranged on both sides of the lower mold base, and the material support surface on the two sets of material support frames is flush with the surface on which the part is placed.

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