Die for negative angle forming of sheet metal part

Abstract

The utility model relates to the technical field of stamping dies, in particular to a die for negative angle forming of sheet metal parts. The die comprises a connecting base, a top die, a flanging die, a connecting piece, a movable pressing block and a bottom die. Wherein the top die and the flanging die are both fixedly connected with the connecting base, the movable pressing block is connected with the connecting base through the connecting piece, and in the process that the connecting base moves towards the bottom die, the movable pressing block makes contact with a to-be-machined sheet metal part before the top die. And when the first guide inclined surface slides relative to the second guide inclined surface, the second negative angle forming surface moves towards the first negative angle forming surface, and the second negative angle forming surface and the first negative angle forming surface jointly extrude the flanging part of the sheet metal part, so that the flanging part of the sheet metal part is formed into a negative angle flanging. In the mold opening process, the movable pressing block can move in the direction away from the flanging mold, so that interference between the movable pressing block and the negative-angle flanging part on the sheet metal part in the mold opening process is avoided, and the effect of conveniently taking out the sheet metal part is achieved.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically to a die for forming negative angles of sheet metal parts. Background Technology

[0002] Automotive sheet metal is a common component in automobiles. During mass production, it typically requires rapid stamping using forming dies on stamping equipment. A forming die usually consists of an upper base and a lower base. The upper base houses the upper die, and the lower base houses the lower die. The stamping equipment's drive mechanism moves the upper base closer to the lower base, causing the upper and lower dies to close and apply pressure to the material, resulting in plastic deformation of the sheet metal to obtain the desired shape.

[0003] Due to the varying shapes required for their design and structural functions, automotive body sheet metal parts often feature structures with negative angle flanges, such as door sill reinforcements.

[0004] Currently, after the sheet metal parts with negative angles are stamped, due to their structural characteristics, when the upper die is taken out upwards, the negative angle part of the sheet metal parts is prone to getting caught on the upper die, making it impossible to take them out directly and reducing production efficiency. Utility Model Content

[0005] To address the aforementioned deficiencies, the technical problem to be solved by this utility model is to provide a mold for forming sheet metal parts at negative angles. This mold can be used for forming sheet metal parts at negative angles and can facilitate the removal of the formed sheet metal parts.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A mold for forming negative angles in sheet metal parts, comprising:

[0008] Connector;

[0009] The top mold is fixedly connected to the connecting seat, and the side of the top mold is provided with a first guide slope;

[0010] A flanging die, wherein the flanging die is fixedly connected to the connecting seat, and the side of the flanging die is provided with a first negative angle forming surface;

[0011] A connector that is capable of bending or extending and retracting along its axial direction;

[0012] A movable pressure block is located between the top mold and the flanging mold. The movable pressure block is connected to the connecting seat via a connector. The side of the movable pressure block is provided with a second guide slope that slides with the first guide slope. The side of the movable pressure block is also provided with a second negative angle forming surface that corresponds to and matches the first negative angle forming surface. During the movement of the connecting seat toward the bottom mold, the movable pressure block contacts the sheet metal part to be processed before the top mold. When the first guide slope slides relative to the second guide slope, the second negative angle forming surface can move toward the first negative angle forming surface.

[0013] The bottom mold, the top of which corresponds to the bottom of the top mold, the flange mold and the movable pressure block.

[0014] By adopting the above scheme, in the initial state, the sheet metal part needs to be formed into a negative angle flange perpendicular to the sheet metal part. The top mold, flange mold, and movable pressure block all have a preset distance from the bottom mold, and the sheet metal part is placed on the bottom mold. During the mold closing process, the connecting seat moves towards the bottom mold, thereby driving the top mold, flange mold, and movable pressure block closer to the sheet metal part on the bottom mold. As the connecting seat moves closer to the bottom mold, the movable pressure block contacts the sheet metal part first. After the movable pressure block contacts the sheet metal part, it cannot continue to move forward because it is blocked by the sheet metal part. At this time, the top mold continues to move towards the bottom mold, and the first guide slope on the top mold slides against the second guide slope on the movable pressure block. Furthermore, the first slope presses against the second slope, causing the movable pressure block to move towards the flange mold, thereby causing the second negative angle forming surface to move towards the first negative angle forming surface. The first negative angle forming surface and the second negative angle forming surface jointly press the flange part, thereby forming the flange part into a negative angle flange. During mold opening, the connecting seat moves away from the bottom mold, and the top and side molds disengage from the sheet metal part before the movable pressure block. Under gravity, the movable pressure block slides relative to the top mold and moves a preset distance away from the flange, thus disengaging it from the flange. As the connecting seat moves away from the bottom mold, the bottom of the movable pressure block eventually disengages from the sheet metal part under the action of the connecting component. During the continuous movement of the movable pressure block away from the bottom mold, since it has already moved a preset distance away from the flange, its movement will not interfere with the negative angle flange, meaning it will not be hooked by it. The overall mold structure is simple, and the sheet metal part does not interfere with the mold during mold opening, allowing for easy removal of the sheet metal part after negative angle molding.

[0015] Preferably, the first guide slope is provided with a first guide groove, the bottom of which is parallel to the first guide slope. The second guide slope is provided with a first guide portion, which is slidably connected within the first guide groove. The cooperation between the first guide groove and the first guide portion makes the relative sliding between the movable pressure block and the top mold more stable.

[0016] Preferably, the width of the opening of the first guide groove is smaller than the width of the bottom of the groove, and the shape of the first guide part matches the first guide groove. Because the width of the opening of the first guide groove is smaller than the width of the bottom of the groove, the first guide part, which matches the shape of the first guide groove, prevents the movable pressure block from disengaging from the top mold along a direction perpendicular to the first guide slope.

[0017] Preferably, the width of the first guide groove opening gradually decreases from the bottom of the groove to the opening.

[0018] Preferably, the bottom of the first guide groove is provided with a second guide groove, the bottom of the second guide groove being parallel to the movement direction of the top mold. The first guide portion is provided with a second guide portion, which is movably connected within the second guide groove. When the movable pressure block abuts against the sheet metal part to be stamped, there is a gap between the second guide portion and the bottom of the second guide groove. When the movable pressure block disengages from the sheet metal part, the second guide portion abuts against the bottom of the second guide groove. As the movable pressure block moves away from the bottom mold, the second inclined surface slides downward relative to the first inclined surface, and the second guide portion gradually approaches the bottom of the second guide groove. After the movable pressure block disengages from the sheet metal part, the second guide portion can abut against the bottom of the second guide groove, preventing the movable pressure block from sliding relative to the top mold towards the bottom mold, thereby preventing the movable pressure block from disengaging from the top mold.

[0019] Preferably, the first negative angle forming surface is concave and the second negative angle forming surface is convex.

[0020] Preferably, the bottom of the top mold has a first forming surface for forming sheet metal parts, and the top of the bottom mold has a second forming surface that corresponds to and matches the first forming surface. Through the first forming surface of the top mold and the second forming surface of the bottom mold, the negative angle of the flange portion of the sheet metal part can be formed during stamping, and the overall shape of the sheet metal part can also be formed under the action of the first and second forming surfaces.

[0021] Preferably, the connector is an elastic element capable of axial expansion and contraction. Because the connector can elastically expand and contract along the axial direction, during the mold opening process, the connector can drive the movable pressure block to move towards the bottom mold, thereby accelerating the movement of the movable pressure block away from the flanging mold, and thus accelerating the flanging mold's escape from the interference range with the flanging portion.

[0022] Preferably, the connecting component is a nitrogen spring. Nitrogen springs are characterized by small size, high elasticity, long stroke, smooth operation, and long service life.

[0023] In summary, the mold for negative angle forming of sheet metal parts provided by this utility model has at least the following beneficial effects:

[0024] 1. The overall structure is simple and does not require additional drive structure, which makes it easy for sheet metal parts to be formed at a negative angle to separate from the mold.

[0025] 2. It can simultaneously stamp and form the entire sheet metal part as well as the flanged part, thereby improving production efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0027] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention during mold closing;

[0028] Figure 2 This is a right view of an embodiment of the present invention during mold closing (for ease of display, the top mold is not pressed against the sheet metal part);

[0029] Figure 3 yes Figure 2 Sectional view at point AA;

[0030] Figure 4 yes Figure 2 Sectional view at point BB;

[0031] Figure 5 This is a right view of an embodiment of the present invention during mold opening;

[0032] Figure 6 yes Figure 5 Sectional view at CC;

[0033] Figure 7 yes Figure 5 Sectional view at point DD;

[0034] Figure 8 This is a three-dimensional structural diagram of the flanging die, movable pressure block, and connecting piece in an embodiment of this utility model;

[0035] Figure 9This is a three-dimensional structural diagram of the bottom mold in an embodiment of this utility model;

[0036] Figure 10 This is a three-dimensional structural diagram of the sheet metal part in an embodiment of this utility model.

[0037] The reference numerals in the attached drawings include: top mold 1, first guide slope 2, flanging mold 3, first negative angle forming surface 4, connecting part 5, movable pressure block 6, second guide slope 7, second negative angle forming surface 8, bottom mold 9, first guide groove 10, first guide part 11, second guide groove 12, second guide part 13, sheet metal part 14, flanging part 15, connecting block 16. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figure 1-10 The present invention will be further described in detail below with reference to specific embodiments.

[0039] Please see Figure 1-10 This embodiment provides a mold for forming negative angles in sheet metal parts, comprising: a connecting seat, a top mold 1, a flanging mold 3, a connecting piece 5, a movable pressure block 6, and a bottom mold 9. The top mold 1 is fixedly connected to the connecting seat, and its side has a first guide slope 2. The top mold 1 is specifically located below the connecting seat. The flanging mold 3 is fixedly connected to the connecting seat, and its side has a first negative angle forming surface 4. The flanging mold 3 is specifically located below the connecting seat. The connecting piece 5 is bendable or can extend and retract along its axial direction. The movable pressure block 6 is located between the top mold 1 and the flanging mold 3, and is connected to the connecting seat via the connecting piece 5. The movable pressure block 6 has a second guide slope 7 that slides with the first guide slope 2 on its side, and a second negative angle forming surface 8 that corresponds to and matches the first negative angle forming surface 4 on its side. During the movement of the connecting seat toward the bottom mold 9, the movable pressure block 6 contacts the sheet metal part 14 to be processed before the top mold 1. During the movement of the connecting seat toward the bottom mold 9, when the first guide slope 2 slides relative to the second guide slope 7, the second negative angle forming surface 8 can move toward the first negative angle forming surface 4. The top of the bottom mold 9 corresponds to the bottom of the top mold 1, the flanging mold 3, and the movable pressure block 6, that is, the bottom mold 9 is located below the top mold 1, the flanging mold 3, and the movable pressure block 6.

[0040] Specifically, the upper end of connector 5 is fixedly connected to connector block 16, and connector block 16 is fixedly connected to connector seat; in order to simultaneously form as Figure 10 The sheet metal part 14 shown requires a flange 15 with a negative angle to be formed in both the left and right directions. The flange 15 is formed by bending the edge of the sheet metal part 14 inwards. Please refer to [link / reference]. Figure 7Preferably, the top die 1 has first guide slopes 2 on both its left and right sides, and the cross-section of the top die 1 is a trapezoid with a wider top and a narrower bottom. Each of the two first guide slopes 2 is provided with a set of connecting blocks 16, connecting parts 5, movable pressure blocks 6, and flanging dies 3 connected in the manner described above. The connecting seat can be specifically installed on the upper base of the sheet metal stamping equipment (the connecting seat is not shown in the figure; it can be specifically located between the connecting block 16 and the top die 1, with the flanging die 3 located below the connecting seat, and mounting holes for the connecting parts to pass through are provided on the connecting seat), or the connecting seat can serve as the upper base. The bottom die 9 is specifically installed on the lower base of the sheet metal stamping equipment, and the sheet metal stamping equipment can drive the upper base closer to the lower base via a drive mechanism.

[0041] By adopting the above solution, please refer to Figure 7 Initially, the sheet metal part 14 needs to be formed with a negative angle flange 15 perpendicular to the sheet metal part 14. The top mold 1, flange mold 3, and movable pressure block 6 all have a preset distance from the bottom mold 9. The sheet metal part 14 is then placed on the bottom mold 9. Please refer to [link / reference]. Figure 4 During the mold closing process, the connecting seat moves towards the bottom mold 9, thereby driving the top mold 1, the flanging mold 3, and the movable pressure block 6 closer to the sheet metal part 14 on the bottom mold 9. As the connecting seat approaches the bottom mold 9, the movable pressure block 6 first contacts the sheet metal part 14. After contacting the sheet metal part 14, the movable pressure block 6 cannot continue to move forward because it is blocked by the sheet metal part 14. At this time, the top mold 1 continues to move towards the bottom mold 9, and the first guide slope 2 on the top mold 1 slides against the second guide slope 7 on the movable pressure block 6. Furthermore, the first slope presses against the second slope, causing the movable pressure block 6 to move towards the flanging mold 3, thereby causing the second negative angle forming surface 8 to move towards the first negative angle forming surface 4. The first negative angle forming surface 4 and the second negative angle forming surface 8 together press against the flanging part 15, thus forming the flanging part 15 into a negative angle flanging. Please refer to [link to relevant documentation]. Figure 7 During the mold opening process, the connecting seat moves away from the bottom mold 9, and the top mold 1 and side molds disengage from the sheet metal part 14 before the movable pressure block 6. The movable pressure block 6 can slide relative to the top mold 1 under gravity, and it moves a preset distance away from the flange 15, thus disengaging from the flange 15. As the connecting seat moves away from the bottom mold 9, the bottom of the movable pressure block 6 eventually disengages from the sheet metal part 14 under the action of the connecting piece 5. During the continuous movement of the movable pressure block 6 away from the bottom mold 9, since it has already moved a preset distance away from the flange 15, its movement will not interfere with the negative angle flange 15, meaning it will not be hooked by the flange 15. The overall structure of the mold is simple, and the sheet metal part 14 will not interfere with the mold during the mold opening process, allowing for easy removal of the sheet metal part 14 after negative angle molding.

[0042] Please see Figure 8 and 9 Preferably, the first guide slope 2 is provided with a first guide groove 10, the bottom of the first guide groove 10 being parallel to the first guide slope 2. The second guide slope 7 is provided with a first guide part 11, which is slidably connected within the first guide groove 10.

[0043] Please continue reading. Figure 9 Preferably, the width of the opening of the first guide groove 10 is smaller than the width of the bottom of the groove, and the shape of the first guide portion 11 matches the first guide groove 10. The width of the opening of the first guide groove 10 gradually narrows from the bottom of the groove to the opening.

[0044] Please continue reading. Figure 6 , Figure 8 and Figure 9 Preferably, the bottom of the first guide groove 10 is provided with a second guide groove 12, the bottom of the second guide groove 12 being parallel to the movement direction of the top mold 1. The top mold 1 moves vertically, and the bottom of the second guide groove 12 is parallel to the vertical plane. A second guide part 13 is provided on the first guide part 11, and the second guide part 13 is movably connected within the second guide groove 12. Figure 3 As shown, when the movable pressure block 6 abuts against the sheet metal part 14 to be stamped, there is a gap between the second guide portion 13 and the bottom of the second guide groove 12; Figure 6 As shown, when the movable pressure block 6 disengages from the sheet metal part 14, the second guide portion 13 abuts against the bottom of the second guide groove 12. The second guide groove 12 blocks the second guide portion 13, thereby preventing the movable pressure block 6 from disengaging downward from the top mold 1.

[0045] Please continue reading. Figure 8 Preferably, the first negative angle forming surface 4 is concave and the second negative angle forming surface 8 is convex.

[0046] The bottom of the top mold 1 is provided with a first forming surface for forming the sheet metal part 14, and the top of the bottom mold 9 is provided with a second forming surface that corresponds to and matches the first forming surface. The first forming surface and the second forming surface are used for forming the non-negative angle flange portion of the sheet metal part 14.

[0047] Connector 5 is an elastic element that can extend and retract along the axial direction; specifically, connector 5 is a nitrogen spring.

[0048] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0049] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0050] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A mold for forming negative angles in sheet metal parts, characterized in that, include: Connector; The top mold (1) is fixedly connected to the connecting seat, and the side of the top mold (1) is provided with a first guide slope (2); A flanging die (3) is fixedly connected to the connecting seat, and the side of the flanging die (3) is provided with a first negative angle forming surface (4); A connector (5) that is capable of bending or extending and retracting along its axial direction; The movable pressure block (6) is located between the top mold (1) and the flanging mold (3). The movable pressure block (6) is connected to the connecting seat through the connector (5). The side of the movable pressure block (6) is provided with a second guide slope (7) that slides with the first guide slope (2). The side of the movable pressure block (6) is provided with a second negative angle forming surface (8) that corresponds to and matches the first negative angle forming surface (4). During the process of the connecting seat moving toward the bottom mold (9), the movable pressure block (6) contacts the sheet metal part (14) to be processed before the top mold (1). When the first guide slope (2) slides relative to the second guide slope (7), the second negative angle forming surface (8) can move toward the first negative angle forming surface (4). The bottom mold (9) has its top corresponding to the bottom of the top mold (1), the flange mold (3) and the movable pressure block (6).

2. The mold for negative angle forming of sheet metal parts according to claim 1, characterized in that, The first guide slope (2) is provided with a first guide groove (10), the bottom of the first guide groove (10) is parallel to the first guide slope (2), and the second guide slope (7) is provided with a first guide part (11), which is slidably connected in the first guide groove (10).

3. A mold for forming negative angles of sheet metal parts according to claim 2, characterized in that, The width of the opening of the first guide groove (10) is smaller than the width of the bottom of the groove, and the shape of the first guide part (11) matches the first guide groove (10).

4. A mold for forming negative angles of sheet metal parts according to claim 3, characterized in that, The width of the first guide groove (10) gradually decreases from the bottom of the groove to the opening.

5. A mold for forming negative angles of sheet metal parts according to claim 3, characterized in that, The bottom of the first guide groove (10) is provided with a second guide groove (12). The bottom of the second guide groove (12) is parallel to the movement direction of the top mold (1). The first guide part (11) is provided with a second guide part (13). The second guide part (13) is movably connected in the second guide groove (12). When the movable pressure block (6) abuts against the sheet metal part (14) to be stamped, there is a gap between the second guide part (13) and the bottom of the second guide groove (12). When the movable pressure block (6) disengages from the sheet metal part (14), the second guide part (13) abuts against the bottom of the second guide groove (12).

6. A mold for forming negative angles of sheet metal parts according to any one of claims 1-5, characterized in that, The first negative angle forming surface (4) is concave, and the second negative angle forming surface (8) is convex.

7. A mold for forming negative angles of sheet metal parts according to any one of claims 1-5, characterized in that, The bottom of the top mold (1) is provided with a first forming surface for forming sheet metal parts (14), and the top of the bottom mold (9) is provided with a second forming surface that corresponds to and matches the first forming surface.

8. A mold for forming negative angles of sheet metal parts according to any one of claims 1-5, characterized in that, The connector (5) is an elastic element that can stretch and contract along the axial direction.

9. A mold for forming negative angles of sheet metal parts according to claim 8, characterized in that, The connecting piece (5) is a nitrogen spring.

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