Metal plate bending cutter with improved structure

Abstract

The utility model discloses a metal plate bending cutter with an improved structure, the upper end of a bending cutter is fixed on a downward pressing mechanism of bending equipment, and at least two upper die forming sliding blocks can be installed below the bending cutter in a relative sliding mode by a set distance. The upper die forming sliding blocks with acute included angles formed between the sliding directions and the horizontal direction can be close to each other under the action of gravity, inclined bending faces are arranged on the side walls, deviating from each other, of the upper die forming sliding blocks respectively, acute included angles are formed between the bending faces and the horizontal planes of the lower sides of the upper die forming sliding blocks, and the lower die forming base is fixed to a workbench of bending equipment. The lower die forming base can support and position a metal plate to be bent in the horizontal direction, and the lower die bending forming device installed on the lower die forming base can bend at least two ends of the metal plate positioned on the lower die forming base so that the two ends of the metal plate can be tightly attached to the bending faces of the upper die forming sliding blocks respectively. According to the negative angle bending device, a plurality of negative angle bending edges are bent in place at a time, the bending precision and the bending efficiency are high, and the bending cost is low.

Description

Technical Field

[0001] The utility model relates to the field of hardware stamping processing, in particular to a sheet metal bending tool with improved structure. Background Art

[0002] When bending NCT sheet metal, if negative angles need to be symmetrically bent on the sheet metal, the bending tool needs to be bent multiple times to achieve the desired forming state. Multiple bendings require more debugging time, and since the forming of each bending negative angle is not carried out simultaneously, only one bending needs to be adjusted while other forming parameters also need to be adjusted. Such a forming structure requires the forming parameters to be adjusted back and forth during production. Especially when the production volume is large, after adjustment, a new bending tool needs to be made, which is relatively wasteful of production costs. Moreover, multiple bendings result in low bending efficiency, high bending costs, and low bending accuracy due to multiple positionings. Content of the Utility Model

[0003] In order to overcome the above defects, the utility model provides a sheet metal bending tool with improved structure, which can reduce the bending process and debugging time, and improve the bending efficiency and bending accuracy.

[0004] The technical solution adopted by the utility model to solve its technical problems: A sheet metal bending tool with improved structure further includes a lower die forming base, a lower die bending and forming device, a bending tool, and an upper die forming slider. The upper end of the bending tool can be fixedly installed on the downward pressing mechanism of the bending equipment. At least two upper die forming sliders are installed below the bending tool and can slide relative to each other by a set distance. The sliding direction of the upper die forming slider forms an acute angle with the horizontal direction, and each upper die forming slider can maintain a position state of approaching each other under the action of gravity. Inclined bending surfaces are respectively provided on the side walls of each upper die forming slider facing away from each other. The bending surface on the upper die forming slider forms an acute angle with the horizontal plane on the lower side of the upper die forming slider. The lower die forming base can be fixedly installed on the workbench of the bending equipment, and the lower die forming base can support and position the sheet metal to be bent in the horizontal direction. The lower die bending and forming device is installed on the lower die forming base, and the lower die bending and forming device can bend at least two ends of the sheet metal positioned on the lower die forming base so that they respectively closely fit on the bending surfaces of the upper die forming sliders.

[0005] As a further improvement of the present utility model, an upper die slider fixing base is fixedly installed on the folding bending knife. The lower end of the upper die slider fixing base forms a tapered structure with gradually shrinking dimensions. Inclined contact surfaces matching the inclined surfaces of the tapered structure are formed on the side walls of the upper die forming sliders close to each other. At least two upper die slider connecting plates are also provided. The upper ends of the upper die slider connecting plates are hinged to the upper die slider fixing base through round holes, and the lower ends of the upper die slider connecting plates are hinged to the upper die forming sliders through long slots. The inclined contact surfaces of the upper die forming sliders are always in sliding contact with the inclined surfaces of the tapered structure at the lower end of the upper die slider fixing base.

[0006] As a further improvement of the present utility model, a limiting stop baffle with an outward expansion in the horizontal direction is formed at the upper end of the upper die slider fixing base, and the upper end of the upper die forming slider abuts against the limiting stop baffle.

[0007] As a further improvement of the present utility model, a forming groove with an open upper end is provided on the lower die forming base. A lower die pressing plate capable of ascending and descending a set distance in the vertical direction is provided in the forming groove. The lower die pressing plate supports the lower side of the sheet metal to be bent. A floating spring is also provided on the bottom surface of the forming groove of the lower die forming base. The floating spring provides an upward elastic restoring force for the lower die pressing plate, and the lower die pressing plate can float under the action of the floating spring until its upper side plane is not lower than the upper plane of the lower die forming base.

[0008] As a further improvement of the present utility model, the lower die bending and forming device includes at least two lower die forming rollers rotatably arranged on the lower die forming base around a horizontal rotating shaft and a horizontally convex dial plate arranged on the side wall of the lower die pressing plate. An opening groove structure is provided on the circumferential outer side wall of the lower die forming roller. One side wall of the opening groove structure forms a bending pressing surface capable of pressing the lower side surface of the sheet metal. The dial plate on the side wall of the lower die pressing plate can be inserted into the upper opening groove on the circumferential outer side wall of the lower die forming roller. As the lower die pressing plate descends, the dial plate can tightly abut against the other side wall of the opening groove structure to make the lower die forming roller rotate a set angle, so that one side wall of the opening groove structure bends the end of the sheet metal upward by a set angle.

[0009] As a further improvement of the present utility model, a roller return spring is also provided. The roller return spring provides an elastic restoring torque for the roller to keep one side wall of its opening groove structure away from the sheet metal.

[0010] As a further improvement of the present utility model, the roller return spring is a tension spring, one end of which is connected to the lower die forming base, and the other end is eccentrically connected to the axial end face of the lower die forming roller.

[0011] As a further improvement of the present utility model, a cylindrical groove with an opening size smaller than the diameter of the lower die forming roller is provided on the lower die forming base, and the lower die forming roller is rotatably inserted into the cylindrical groove.

[0012] As a further improvement of the present utility model, the forming groove of the lower die forming base is a stepped groove with an upper end size larger than the lower end size, the lower die pressing plate is a T-shaped block matching the forming groove, the cylindrical groove on the lower die forming base is located at the stepped corner of the stepped groove, and the other side wall of the opening groove structure of the lower die forming roller can be horizontally aligned with the stepped surface of the stepped groove.

[0013] As a further improvement of the present utility model, a nut pad block is fixedly provided on the outer side wall of the lower die forming base, and an L-shaped limit block is also provided. The L-shaped horizontal limit block is detachably fixedly installed on the nut pad block through a bolt, and the side wall of the L-shaped horizontal limit block extending in the vertical direction can tightly abut against the outer side wall surface of the sheet metal to be bent.

[0014] The beneficial effects of the present utility model are as follows: The present utility model ingeniously uses the inclined slider structure. After bending, the upper die forming sliders slide obliquely to withdraw from the bent workpiece, and multiple forming operations are combined into one forming operation. During forming, first, the upper die forming sliders move to the position, and then the lower die performs bending and forming. The present utility model changes the single-position forming in one process to multi-position forming in one process by setting multiple upper die forming sliders. With such a forming structure, when the forming position changes, different positions can be formed only by modifying the upper die forming sliders; for different forming positions, different sliders are made, and the bent parts of different products can be formed into a symmetric negative angle bending structure, which can reduce the bending process and debugging time, and bend multiple negative angle bending edges in place at one time, with high bending accuracy and efficiency, reducing the bending cost. The present utility model also does not need to make a large bending knife, only relatively small forming part parts need to be made, and the parts of other parts can be shared, which is convenient for standardized customization. The present utility model can also reduce the scratches during bending, ensure the appearance of the bending points, and improve the bending quality of the products. Description of the Drawings

[0015] Figure 1 Front view of a sheet metal bending part with symmetric negative angles;

[0016] Figure 2 Front view of the first forming step of the prior art;

[0017] Figure 3 Front view of the second forming step of the prior art;

[0018] Figure 4 Front view of the present utility model;

[0019] Figure 5 This is the top view of the present utility model;

[0020] Figure 6 This is the state diagram when the upper die forming slider of the present utility model just contacts the sheet metal;

[0021] Figure 7 This is the state diagram when the upper die forming slider of the present utility model moves to the forming point;

[0022] Figure 8 This is the state diagram when the present utility model forms the sheet metal;

[0023] Figure 9 This is the state diagram when the sheet metal formed by the present utility model is about to separate from the lower die pressure plate;

[0024] Figure 10 This is the state diagram when the upper die forming slider of the present utility model disengages from the product;

[0025] Figure 11 This is the front view of the folding bending knife of the present utility model;

[0026] Figure 12 This is the top view of the folding bending knife of the present utility model;

[0027] Figure 13 This is the front view of the upper die slider fixing base of the present utility model;

[0028] Figure 14 This is the top view of the upper die slider fixing base of the present utility model;

[0029] Figure 15 This is the front view of the connecting plate of the present utility model;

[0030] Figure 16 This is the front view of an upper die forming slider of the present utility model;

[0031] Figure 17 This is the top view of an upper die forming slider of the present utility model;

[0032] Figure 18 This is the front view of the lower die forming base of the present utility model;

[0033] Figure 19 This is the top view of the lower die forming base of the present utility model;

[0034] Figure 20 This is the front view of the lower die pressure plate of the present utility model;

[0035] Figure 21 This is the front view of a lower die forming roller of the present utility model;

[0036] Figure 22This is a top view of a lower die forming roller of the present utility model. Detailed implementation mode

[0037] Embodiment: A sheet metal bending tool with an improved structure further includes a lower die forming base 1, a lower die bending and forming device, a bending knife 2, and an upper die forming slider 3. The upper end of the bending knife 2 can be fixedly installed on the downward pressing mechanism of the bending equipment. At least two upper die forming sliders 3 can be installed below the bending knife 2 to slide a set distance relatively. The sliding direction of the upper die forming slider 3 forms an acute angle with the horizontal direction, and each upper die forming slider 3 can maintain a position state of approaching each other under the action of gravity. Inclined bending surfaces 31 are respectively provided on the side walls of each upper die forming slider 3 facing away from each other. The bending surface 31 on the upper die forming slider 3 forms an acute angle with the horizontal plane on the lower side of the upper die forming slider 3. The lower die forming base 1 can be fixedly installed on the working table of the bending equipment. The lower die forming base 1 can support and position the sheet metal 4 to be bent in the horizontal direction. The lower die bending and forming device is installed on the lower die forming base 1. The lower die bending and forming device can bend at least two ends of the sheet metal 4 positioned on the lower die forming base 1 so that they are respectively closely attached to the bending surfaces 31 of the upper die forming sliders 3.

[0038] Before bending the sheet metal 4, first fixedly install the bending knife 2 on the downward pressing mechanism of the bending equipment, fixedly install the lower die forming base 1 on the working table of the bending equipment, place the sheet metal 4 on the lower die forming base 1 for positioning. Then, the downward pressing mechanism of the bending equipment drives the bending knife 2 to descend. When the bending knife 2 descends to a set height, the upper die forming sliders 3 installed on the bending knife 2 start to contact the upper surface of the sheet metal 4. As the bending knife 2 continues to descend, the upper die forming sliders 3 start to slide obliquely. When the bending knife 2 descends in place, two or more upper die forming sliders 3 slide horizontally to the forming position. Then, two or more lower die bending and forming devices start to bend the sheet metal 4, so that the end of the sheet metal 4 is bent upward and finally closely adheres to the inclined bending surface 31 of the upper die forming slider 3. At this time, a negative angle bending structure is formed at both ends or more edges of the sheet metal 4. The bending knife 2 starts to rise. As the bending knife 2 rises, two or more upper die forming sliders 3 start to move horizontally towards each other and finally separate from the bending edge of the sheet metal 4 to realize product demoulding.

[0039] The above mechanism realizes one-step forming of two or more symmetrically arranged negative angle bending edges on the sheet metal 4, simplifies the forming process of this kind of part, improves the forming efficiency and quality, and reduces the bending cost.

[0040] A fixed upper die slider fixing base 5 is also installed on the folding bending knife 2. The lower end of the upper die slider fixing seat forms a conical structure 51 with a gradually shrinking size. Inclined contact surfaces 32 matching the inclined surfaces of the conical structure 51 are formed on the side walls of the upper die forming sliders 3 close to each other. At least two upper die slider connecting plates 6 are also provided. The upper ends of the upper die slider connecting plates 6 are hinged to the upper die slider fixing base 5 through round holes 61, and the lower ends of the upper die slider connecting plates 6 are hinged to the upper die forming sliders 3 through long strip holes 62. The inclined contact surfaces 32 of the upper die forming sliders 3 are always in sliding contact with the inclined surfaces of the conical structure 51 at the lower end of the upper die slider fixing base 5.

[0041] The upper die slider fixing base 5 and the folding bending knife 2 are preferably a detachable fixed connection and positioning structure, which is convenient for replacing the upper die forming slider 3 for forming products of different specifications without disassembling the folding bending knife 2, realizing the sharing of the folding bending knife 2. The upper die forming slider 3 is connected to the upper die slider fixing base 5 by the upper die slider connecting plate 6. Under the action of its own weight, after the upper die forming slider 3 breaks away from the support below, it will slide along the inclined surface of the conical structure 51 on the upper die slider fixing base 5 and approach each other to realize the demolding of the sheet metal 4 product. When it descends, due to being blocked by the sheet metal 4 to be formed, the upper die forming slider 3 will slide in the reverse direction along the inclined surface of the conical structure 51 on the upper die slider fixing base 5 and move away from each other to reach the bending and forming position, realizing the support and limitation for the bending and forming of the sheet metal 4, ensuring the bending accuracy and bending angle accuracy of the sheet metal 4. In addition to using the upper die slider connecting plate 6 to maintain the connection and positioning with the upper die slider fixing base 5, an inclined slideway can also be provided on the upper die slider fixing base 5, and a connecting shaft rod is provided on the upper die forming slider 3, and the connecting shaft rod can be inserted into the inclined slideway. This is an equivalent replacement structure that can be easily thought of by those skilled in the art according to this application and belongs to the protection scope of this application.

[0042] A limiting stop baffle 52 with an outward expansion in the horizontal direction is formed at the upper end of the upper die slider fixing base 5, and the upper end of the upper die forming slider 3 abuts against the limiting stop baffle 52. The limiting stop baffle 52 can limit the position of the upper die forming slider 3 when it slides obliquely upward on the upper die slider fixing base 5, ensuring that it remains stable during bending and forming, which is beneficial to improving the bending accuracy.

[0043] The lower die forming base 1 is provided with a forming groove 11 with an upper end opening, and the forming groove 11 is provided with a lower die pressing plate 7 that can move up and down a set distance in the vertical direction. The lower die pressing plate 7 is supported on the lower side of the sheet metal 4 to be bent, and a floating spring 8 is also provided on the bottom surface of the forming groove 11 of the lower die forming base 1. The floating spring 8 provides an upward elastic reset force to the lower die pressing plate 7. The lower die pressing plate 7 can float to a level where its upper side plane is not lower than the upper plane of the lower die forming base 1 under the action of the floating spring 8. The lower die pressing plate 7 is used for descending support and buffering of the sheet metal 4 during bending, and can also realize demolding of the product from the forming groove 11 of the lower die forming base 1.

[0044] The lower die bending and forming device includes at least two lower die forming rollers 9 which can rotate around a horizontal rotation axis and are arranged on the lower die forming base 1, and a horizontally convex toggle plate 71 which is arranged on the side wall of the lower die pressing plate 7. An open groove structure 91 is arranged on the circumferential outer wall of the lower die forming roller 9, and a side wall of the open groove structure forms a bending pressing surface 92 which can press the lower side surface of the sheet metal 4. The toggle plate 71 on the side wall of the lower die pressing plate 7 can be inserted into the open groove at the upper end of the circumferential outer wall of the lower die forming roller 9, and as the lower die pressing plate 7 descends, the toggle plate 71 can be pressed against the other side wall of the open groove structure 91 to rotate the lower die forming roller 9 to a set angle, thereby causing one side wall of the open groove structure 91 to bend the end of the sheet metal 4 upward to a set angle.

[0045] When the lower die pressing plate 7 is pressed down, the toggle plate 71 on its side wall will toggle the other side wall of the open groove structure 91 of the lower die forming roller 9, so that the lower die forming roller 9 rotates a certain angle, and then the side wall of the open groove structure 91 of the lower die forming roller 9 flips over to squeeze the lower side of the sheet metal 4, and bends the end of the sheet metal 4 upward at a certain angle, finally completing the bending of the sheet metal 4. When the bending knife 2 rises and resets, the lower die pressing plate 7 rises and resets, and the lower die forming roller 9 can be flipped over and reset in the opposite direction.

[0046] A roller return spring 10 is also provided, and the roller return spring 10 provides the roller with an elastic return torque to keep a side wall of the upper opening groove structure 91 thereof away from the sheet metal 4 .

[0047] The roller reset spring 10 is a tension spring, one end of which is connected to the lower die forming base 1, and the other end of which is eccentrically connected to the axial end surface of the lower die forming roller 9. In addition, the roller reset can also be a torsion spring.

[0048] The lower die forming base 1 is provided with a cylindrical groove 12 whose opening size is smaller than the diameter of the lower die forming roller 9. The lower die forming roller 9 can be rotatably inserted in the cylindrical groove 12. The lower die forming roller 9 can also be installed on the lower die forming base 1 through a rotating shaft.

[0049] The forming groove 11 of the lower die forming base 1 is a stepped groove with an upper dimension larger than the lower dimension. The lower die pressure plate 7 is a T-shaped block matching the forming groove 11. The cylindrical groove 12 on the lower die forming base 1 is located at the step corner of the stepped groove, and the other side wall of the opening groove structure 91 of the lower die forming roller 9 can be horizontally aligned with the step surface of the stepped groove.

[0050] A nut pad 13 is fixedly arranged on the outer side wall of the lower die forming base 1, and an L-shaped limit block 14 is also provided. The L-shaped horizontal limit block can be detachably fixedly installed on the nut pad 13 through a bolt 15. The side wall of the L-shaped horizontal limit block extending in the vertical direction can tightly abut against the outer side wall surface of the sheet metal 4 to be bent. The sheet metal 4 is limited on the lower die forming base 1 by the side wall of the L-shaped horizontal limit block extending vertically. By replacing the L-shaped limit blocks 14 with different specifications, the limitation of sheet metals 4 with different specifications can be adapted.

Claims

1. A sheet metal bending tool with improved structure, characterized in that: The invention also comprises a lower die forming base (1), a lower die bending forming device, a bending knife (2) and an upper die forming slider (3), wherein the upper end of the bending knife can be fixedly mounted on the pressing mechanism of the bending device, at least two upper die forming sliders can be relatively slidably mounted below the bending knife at a set distance, the sliding direction of the upper die forming slider has an acute angle with the horizontal direction, and each upper die forming slider can maintain a position close to each other under the action of gravity, and each upper die forming slider is provided with an inclined bending surface (31) on the side walls facing away from each other, and the bending surface on the upper die forming slider forms an acute angle with the horizontal surface on the lower side of the upper die forming slider, the lower die forming base can be fixedly mounted on the workbench of the bending device, the lower die forming base can support and position the sheet metal (4) to be bent in the horizontal direction, the lower die bending forming device is mounted on the lower die forming base, and the lower die bending forming device can bend at least two ends of the sheet metal positioned on the lower die forming base so that they are respectively tightly fitted on the bending surfaces of the upper die forming slider.

2. The sheet metal bending tool with improved structure according to claim 1, characterized in that: The bending knife is also fixedly mounted with an upper die slider fixed base (5), the lower end of the upper die slider fixed base forms a tapered structure (51) with a gradually shrinking size, and the side walls of each upper die forming slider close to each other are formed with an inclined contact surface (32) matching the inclined surface of the tapered structure, and at least two upper die slider connecting plates (6) are also provided, the upper end of the upper die slider connecting plate is hingedly connected to the upper die slider fixed base through a circular hole (61), and the lower end of the upper die slider connecting plate is hingedly connected to the upper die forming slider through a long hole (62), and the inclined contact surface of each upper die forming slider is always in slidable contact with the inclined surface of the tapered structure at the lower end of the upper die slider fixed base.

3. The sheet metal bending tool with improved structure according to claim 2, characterized in that: A limit stop plate (52) with a horizontally expanded dimension is formed at the upper end of the upper die slider fixed base, and the upper end of the upper die forming slider is stopped on the limit stop plate.

4. The sheet metal bending tool with improved structure according to claim 1, characterized in that: The lower die forming base is provided with a forming groove (11) with an upper end opening, and a lower die pressing plate (7) capable of moving up and down a set distance in a vertical direction is provided in the forming groove, and the lower die pressing plate is supported on the lower side of the sheet metal to be bent, and a floating spring (8) is also provided on the bottom surface of the forming groove of the lower die forming base, and the floating spring provides an upward elastic reset force to the lower die pressing plate, and the lower die pressing plate can float to an upper plane not lower than the upper plane of the lower die forming base under the action of the floating spring.

5. The sheet metal bending tool with improved structure according to claim 4, characterized in that: The lower die bending and forming device comprises at least two lower die forming rollers (9) which can rotate around a horizontal rotation axis and are arranged on a lower die forming base, and a horizontally convex toggle plate (71) which is arranged on the side wall of the lower die pressing plate. An open groove structure (91) is arranged on the circumferential outer wall of the lower die forming roller, and a side wall of the open groove structure forms a bending pressing surface (92) which can press the lower side surface of the sheet metal. The toggle plate on the side wall of the lower die pressing plate can be inserted into the open groove at the upper end of the circumferential outer wall of the lower die forming roller, and as the lower die pressing plate descends, the toggle plate can be pressed against the other side wall of the open groove structure to rotate the lower die forming roller to a set angle, thereby causing one side wall of the open groove structure to bend the end of the sheet metal upward to a set angle.

6. The sheet metal bending tool with improved structure according to claim 5, characterized in that: A roller return spring (10) is also provided, and the roller return spring provides the roller with an elastic return torque to keep a side wall of the upper opening groove structure of the roller away from the sheet metal.

7. The sheet metal bending tool with improved structure according to claim 6, characterized in that: The roller return spring is a tension spring, one end of which is connected to the lower die forming base, and the other end of which is eccentrically connected to the axial end face of the lower die forming roller.

8. The sheet metal bending tool with improved structure according to claim 5, characterized in that: The lower die forming base is provided with a cylindrical groove (12) whose opening size is smaller than the diameter of the lower die forming roller, and the lower die forming roller is rotatably inserted in the cylindrical groove.

9. The sheet metal bending tool with improved structure according to claim 8, characterized in that: The molding groove of the lower mold molding base is a step groove with an upper end size larger than a lower end size, the lower mold pressing plate is a T-shaped block matching the molding groove, the cylindrical groove on the lower mold molding base is located at the step corner of the step groove, and the other side wall of the open groove structure of the lower mold molding roller can be horizontally aligned with the step surface of the step groove.

10. The sheet metal bending tool with improved structure according to claim 1, characterized in that: A nut washer (13) is fixedly provided on the outer side wall of the lower die forming base, and an L-shaped limit block (14) is also provided. The L-shaped horizontal limit block is detachably fixedly mounted on the nut washer by means of bolts (15), and the side wall of the L-shaped horizontal limit block extending in the vertical direction can tightly abut against the outer side wall surface of the sheet metal to be bent.

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