Pre-bending mechanism of edge covering die and edge covering process

Abstract

The invention relates to a pre-bending mechanism of an edge covering die and an edge covering process. The pre-bending mechanism comprises three times of upper die descending and three times of upper die ascending. According to the pre-bending mechanism, the two trapezoidal driving blocks are matched to complete the pre-bending action, the structural complexity is greatly simplified, the structural size is reduced, the contact form of the pre-bending mechanism is plane contact, the surface contact pressure during contact is greatly reduced, the requirements of parts on materials are reduced, and therefore the die cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sheet metal forming, and in particular relates to a pre-bending mechanism of an edge wrapping die and an edge wrapping process. Background Art

[0002] At present, the pre-bending of sheet metal hemming is mainly achieved through a standard pre-bending mechanism, the principle of which is to push the pre-bending insert to complete the pre-bending action through the cooperation between the driving block on the driving arm and the pre-bending swing wheel. However, the standard pre-bending mechanism is large in size and relatively complex in structure, and the cooperation between the driving block and the pre-bending swing wheel is linear contact, the surface contact pressure during contact is large, and the material requirements for the parts are also high. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a pre-bending mechanism and a hemming process for an hemming mold. The pre-bending action is completed through the cooperation of two trapezoidal driving blocks, which greatly simplifies the complexity of the structure and reduces the structure size. The contact form of this pre-bending mechanism is a plane contact, which greatly reduces the surface contact pressure during contact and reduces the material requirements of components, thereby reducing the mold cost.

[0004] The present invention solves the technical problem by the following technical solutions:

[0005] A pre-bending mechanism for an edge wrapping die, characterized in that: it comprises an upper die seat and a lower die seat, the upper die seat is connected to a fixed plate via a supporting column, a longitudinal guide plate, a pressure block and a longitudinal nitrogen spring are coaxially installed on the left side of the fixed plate from outside to inside, the pressure block is longer than the longitudinal guide plate, the top end of the longitudinal nitrogen spring is connected to the upper die seat, a shaping insert is installed on the fixed plate on the right side of the longitudinal guide plate, a driving arm is installed on the lower right end of the fixed plate, the right side of the driving arm is connected to the guide plate, the guide plate moves in coordination with the guide block arranged on the right side of the lower die seat, the left side of the driving arm is connected to a first trapezoidal driving block, and the first trapezoidal driving block is provided with a lower inclined surface A, a vertical surface B and an upper inclined surface C;

[0006] The fixed plate is connected to the lower die base through a guide column, the lower die is fixedly installed on the left side of the lower die base, a sheet metal part is placed on the lower die, and a pre-bending insert is connected to the right side of the lower die through a transverse nitrogen spring. The pre-bending insert is slidably set on a transverse guide plate set on the lower die base, and the right side of the pre-bending insert is connected to the second trapezoidal driving block, and the second trapezoidal driving block is provided with an upper inclined surface A, a vertical surface B and a lower inclined surface C.

[0007] A hemming process of an hemming mold, characterized in that: the process steps are:

[0008] (1) Upper die descending stage 1: When the upper die descends, the pressing block first presses the sheet metal part, and the upper die continues to descend. The lower inclined surface A of the first trapezoidal driving block and the upper inclined surface A of the second trapezoidal driving block slide together, pushing the pre-bending insert to move horizontally to the left on the guide plate, thereby bending the sheet metal part;

[0009] (2) Upper die downward stage 2: The upper die continues to move downward, and the vertical surface B of the first trapezoidal driving block is slidably matched with the vertical surface B of the trapezoidal driving block, and the pre-bent insert remains stationary;

[0010] (3) Upper die downward stage 3: The upper die continues to move downward, and the upper inclined surface C of the first trapezoidal driving block contacts the lower inclined surface C of the second trapezoidal driving block. Due to the action of the transverse nitrogen spring, the pre-bending insert is pushed to move horizontally to the right on the guide plate and retreat. When it retreats to the initial position, the shaping insert begins to contact the sheet metal part until the upper die moves downward to the end point, and the shaping insert completely presses the sheet metal part.

[0011] (4) Upper die upward stage 1: When the upper die moves upward, the shaping insert is first separated from the sheet metal part. When the upper inclined surface C of the first trapezoidal driving block slides with the lower inclined surface of the second trapezoidal driving block, the pre-bending insert is pushed to move horizontally to the left on the guide plate;

[0012] (5) Upper die upward stage 2: the upper die continues to move upward, and the vertical surface B of the first trapezoidal driving block is slidably matched with the vertical surface B of the second trapezoidal driving block, and the pre-bent insert remains stationary;

[0013] (6) Upper die upward stage 3: The upper die continues to move upward, and the lower inclined surface A of the first trapezoidal driving block slides with the upper inclined surface A of the second trapezoidal driving block. Due to the action of the transverse nitrogen spring, the pre-bent insert is pushed horizontally to the right on the guide plate and returns to the initial position. The upper die continues to move upward, and the first trapezoidal driving block and the pressure block successively break away from contact with the lower die, and the hemming process ends.

[0014] The advantages and beneficial effects of the present invention are:

[0015] 1. The pre-bending mechanism of the present invention simplifies the structural complexity of the traditional pre-bending mechanism and reduces the structural size;

[0016] 2. The present invention changes the line contact mode in the traditional pre-bending mechanism into a plane contact mode, which reduces the contact pressure on the surface of the parts and the requirements of the parts on the material, thereby reducing the cost of the mold;

[0017] 3. The present invention completes the pre-bending action through the cooperation of two trapezoidal drive blocks, which greatly simplifies the complexity of the structure and reduces the structural size. In addition, the contact form of this pre-bending mechanism is a plane contact, which greatly reduces the surface contact pressure during contact, reduces the requirements of the parts on the material, and thus reduces the mold cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the hemming mold of the present invention in the mold opening state;

[0019] Figure 2 This is a schematic diagram of the structure of the hemming die in the pre-bending state of the present invention;

[0020] Figure 3 This is a schematic structural diagram of the hemming mold of the present invention in a closed state;

[0021] Figure 4 FIG. 4 is a schematic diagram of a first trapezoidal driving block and a second trapezoidal driving block according to the present invention.

[0022] In the figure: 1. upper die seat; 2. support column; 3. guide column; 4. fixed plate; 5. drive arm; 6. first trapezoidal drive block; 7. guide plate; 8. pre-bent insert; 9. second trapezoidal drive block; 10. guide block; 11. lower die seat 12. longitudinal nitrogen spring; 13. longitudinal guide plate; 14. press block; 15. shaping insert; 16. sheet metal; 17. lower die; 18. transverse nitrogen spring; 19. transverse guide plate. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0024] Figures 1 to 3 They are schematic diagrams of the structure of an edge wrapping mold in the open, pre-bending and closed states. Figure 4 Schematic diagram of the drive block. Normally, the pre-bending of sheet metal hemming is mainly achieved through a standard pre-bending mechanism, the principle of which is to push the pre-bending insert to complete the pre-bending action through the cooperation between the drive block on the drive arm and the pre-bending swing wheel. However, the standard pre-bending mechanism is large in size and relatively complex in structure, and the cooperation between the drive block and the pre-bending swing wheel is linear contact. The surface contact pressure during contact is large, and the material requirements for parts are also high. The new pre-bending mechanism completes the pre-bending action through the cooperation of the first trapezoidal drive block 6, the second trapezoidal drive block 9 and the transverse nitrogen spring 18. The structural complexity is greatly simplified, the structural size is reduced, and the contact form of this pre-bending mechanism is plane contact, which greatly reduces the surface contact pressure during contact, reduces the material requirements of parts, and thus reduces the mold cost.

[0025] A pre-bending mechanism for a hemming die, the innovation of which is that it comprises an upper die seat 1 and a lower die seat 11, the upper die seat 1 is connected to a fixed plate 4 via a support column 2, a longitudinal guide plate 13, a pressure block 14 and a longitudinal nitrogen spring 12 are coaxially installed on the left side of the fixed plate 4 from outside to inside, the pressure block 14 is longer than the longitudinal guide plate 13, the top end of the longitudinal nitrogen spring 12 is connected to the upper die seat 1, a shaping insert 15 is installed on the fixed plate 4 on the right side of the longitudinal guide plate 13, a driving arm 5 is installed on the lower end of the right side of the fixed plate 4, the right side of the driving arm 5 is connected to a guide plate 7, the guide plate 7 moves in coordination with a guide block 10 arranged on the right side of the lower die seat 11, the left side of the driving arm 5 is connected to a first trapezoidal driving block 6, the first trapezoidal driving block 6 is provided with a lower inclined surface A, a vertical surface B and an upper inclined surface C;

[0026] The fixed plate 4 is connected to the lower die base 11 through the guide column 3, the lower die 17 is fixedly installed on the left side of the lower die base 11, the sheet metal part 16 is placed on the lower die 17, and the right side of the lower die 17 is connected to the pre-bending insert 8 through the transverse nitrogen spring 18. The pre-bending insert 8 is slidably set on the transverse guide plate 19 set on the lower die base 11, and the right side of the pre-bending insert 8 is connected to the second trapezoidal driving block 9, and the second trapezoidal driving block 9 is provided with an upper inclined surface A, a vertical surface B and a lower inclined surface C.

[0027] A hemming process of an hemming mold, the innovation of which lies in: the process steps are:

[0028] (1) Upper die descending stage 1: When the upper die descends, the pressing block 14 first presses the sheet metal part 16, and the upper die continues to descend. The lower inclined surface A of the first trapezoidal driving block 6 and the upper inclined surface A of the second trapezoidal driving block 9 are slidably matched, pushing the pre-bending insert 8 to move horizontally to the left on the guide plate 19, thereby bending the sheet metal part 16;

[0029] (2) Upper die downward stage 2: The upper die continues to move downward, and the vertical surface B of the first trapezoidal driving block 6 is slidably matched with the vertical surface B of the trapezoidal driving block 9, while the pre-bent insert remains stationary;

[0030] (3) Upper die descending stage 3: The upper die continues to descend, and the upper inclined surface C of the first trapezoidal driving block 6 contacts the lower inclined surface C of the second trapezoidal driving block 9. Due to the action of the transverse nitrogen spring 18, the pre-bending insert 8 is pushed to move horizontally to the right on the guide plate 19 and retreat. When it retreats to the initial position, the shaping insert 15 begins to contact the sheet metal part 16 until the upper die descends to the end point and the shaping insert 15 completely presses the sheet metal part 16.

[0031] (4) Upper die upward stage 1: When the upper die moves upward, the shaping insert 15 first separates from the sheet metal part 16, and when the upper inclined surface C of the first trapezoidal driving block 6 and the lower inclined surface of the second trapezoidal driving block 9 slide together, the pre-bending insert 8 is pushed to move horizontally to the left on the guide plate 19;

[0032] (5) Upper die upward stage 2: the upper die continues to move upward, and the vertical surface B of the first trapezoidal driving block 6 is slidably matched with the vertical surface B of the second trapezoidal driving block 9, and the pre-bent insert remains stationary;

[0033] (6) Upper die upward stage 3: The upper die continues to move upward, and the lower inclined surface A of the first trapezoidal driving block 6 is slidably matched with the upper inclined surface A of the second trapezoidal driving block 9. Due to the action of the transverse nitrogen spring 18, the pre-bent insert 8 is pushed horizontally to the right on the guide plate 19 and returns to the initial position. The upper die continues to move upward, and the first trapezoidal driving block 6 and the pressure block 14 are successively out of contact with the lower die, and the hemming process is completed.

[0034] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A pre-bending mechanism for an edge wrapping die, characterized in that: The invention comprises an upper die base (1) and a lower die base (11), wherein the upper die base (1) is connected to a fixed plate (4) via a support column (2), a longitudinal guide plate (13), a pressure block (14) and a longitudinal nitrogen spring (12) are coaxially installed on the left side of the fixed plate (4) from outside to inside, the pressure block (14) is longer than the longitudinal guide plate (13), the top end of the longitudinal nitrogen spring (12) is connected to the upper die base (1), a shaping insert (15) is installed on the fixed plate (4) on the right side of the longitudinal guide plate (13), a driving arm (5) is installed on the lower end of the right side of the fixed plate (4), the right side of the driving arm (5) is connected to a guide plate (7), the guide plate (7) moves in coordination with a guide block (10) arranged on the right side of the lower die base (11), the left side of the driving arm (5) is connected to a first trapezoidal driving block (6), and the first trapezoidal driving block (6) is provided with a lower inclined surface A, a vertical surface B and an upper inclined surface C; The fixed plate (4) is connected to the lower die base (11) through a guide column (3); a lower die (17) is fixedly installed on the left side of the lower die base (11); a sheet metal part (16) is placed on the lower die (17); a pre-bending insert (8) is connected to the right side of the lower die (17) through a transverse nitrogen spring (18); the pre-bending insert (8) is slidably arranged on a transverse guide plate (19) arranged on the lower die base (11); the right side of the pre-bending insert (8) is connected to a second trapezoidal driving block (9); and the second trapezoidal driving block (9) is provided with an upper inclined surface A, a vertical surface B and a lower inclined surface C.

2. A hemming process of the pre-bending mechanism of the hemming die according to claim 1, characterized in that: The process steps are: (1) Upper die descending stage 1: When the upper die descends, the pressing block 14 first presses the sheet metal part 16, and the upper die continues to descend. The lower inclined surface A of the first trapezoidal driving block 6 and the upper inclined surface A of the second trapezoidal driving block 9 are slidably matched, pushing the pre-bending insert 8 to move horizontally to the left on the guide plate 19, thereby bending the sheet metal part 16; (2) Upper die downward stage 2: The upper die continues to move downward, and the vertical surface B of the first trapezoidal driving block 6 is slidably matched with the vertical surface B of the trapezoidal driving block 9, while the pre-bent insert remains stationary; (3) Upper die descending stage 3: The upper die continues to descend, and the upper inclined surface C of the first trapezoidal driving block 6 contacts the lower inclined surface C of the second trapezoidal driving block 9. Due to the action of the transverse nitrogen spring 18, the pre-bending insert 8 is pushed to move horizontally to the right on the guide plate 19 and retreat. When it retreats to the initial position, the shaping insert 15 begins to contact the sheet metal part 16 until the upper die descends to the end point and the shaping insert 15 completely presses the sheet metal part 16. (4) Upper die upward stage 1: When the upper die moves upward, the shaping insert 15 first separates from the sheet metal part 16, and when the upper inclined surface C of the first trapezoidal driving block 6 and the lower inclined surface of the second trapezoidal driving block 9 slide together, the pre-bending insert 8 is pushed to move horizontally to the left on the guide plate 19; (5) Upper die upward stage 2: the upper die continues to move upward, and the vertical surface B of the first trapezoidal driving block 6 is slidably matched with the vertical surface B of the second trapezoidal driving block 9, and the pre-bent insert remains stationary; (6) Upper die upward stage 3: The upper die continues to move upward, and the lower inclined surface A of the first trapezoidal driving block 6 is slidably matched with the upper inclined surface A of the second trapezoidal driving block 9. Due to the action of the transverse nitrogen spring 18, the pre-bent insert 8 is pushed horizontally to the right on the guide plate 19 and returns to the initial position. The upper die continues to move upward, and the first trapezoidal driving block 6 and the pressure block 14 are successively out of contact with the lower die, and the hemming process is completed.

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