Indentation-free lower die

Abstract

The utility model relates to the technical field of indentation-free bending, and provides an indentation-free lower die which comprises a lower die set, a positioning mechanism is arranged on the lower die set, a to-be-bent plate can be preliminarily positioned on the lower die set through the positioning mechanism, and a worker can conveniently and rapidly find the bending position on the to-be-bent plate. Limiting clamping mechanisms are symmetrically arranged on the two sides of the lower die set, under the action of the limiting clamping mechanisms, by adjusting the structures of the limiting clamping mechanisms, when a large number of plates are bent, the plates only need to be placed on the two rotating dies at will, a motor controls a two-way lead screw to rotate, the two limiting clamping mechanisms get close to each other, and then the plates are bent. The plate to be bent can be automatically pushed and positioned on the rotating die through the push plate on the limiting and clamping mechanism, the plate to be bent does not need to be positioned one by one, the working efficiency and the bending quality are greatly improved, the number of defective products is reduced, and high use value is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of indentation-free bending, and more specifically, to an indentation-free lower die. Background Art

[0002] A stamping die is a special process equipment for processing materials into parts in cold stamping. Among them, a bending die is used to bend a flat blank into an angled shape. Depending on the shape, precision, and production volume of the parts, there are various different forms of dies. With the continuous progress of bending technology, in order to avoid abrasion on the outer wall of the plate when bending the plate, currently, an indentation-free lower die is mostly used to assist the workpiece in bending. The indentation-free lower die generally consists of a support, two flip seats with semi-cylindrical structures symmetrically arranged on the support, and a return spring for connecting the support and the flip seat. During the steel plate bending operation, the two flip seats can flip as the plate bends, thus avoiding scratches on the plate surface and ensuring the straight-edge machining precision of the workpiece.

[0003] However, in the actual application process, when bending the plate, the plate needs to be accurately placed on the lower die. Currently, when placing the plate, most of them are observed and placed by eyesight, and then the upper die is lowered to find the specific bending position on the plate. The operation is rather troublesome and inconvenient. Especially when bending a large number of plates in the same batch, searching for the position of each plate one by one greatly reduces the work efficiency, and the accuracy of plate placement is not high, which easily reduces the bending quality and increases the defective rate.

[0004] In view of this, the present utility model proposes an indentation-free lower die. Summary of the Utility Model

[0005] The present utility model proposes an indentation-free lower die, which solves the problem in the related technology that when bending a plate, it is necessary to search for the position of each plate one by one, greatly reducing the work efficiency and easily reducing the bending quality and increasing the defective rate.

[0006] The technical solution of the present utility model is as follows: An indentation-free lower die, comprising: a U-shaped frame and an upper pressing die arranged inside the U-shaped frame. An electro-hydraulic device for lifting the upper pressing die is fixedly installed on the top of the U-shaped frame. A lower die set is arranged at the bottom of the U-shaped frame. The lower die set includes a vertical seat fixedly installed at the bottom of the U-shaped frame. Two rotating dies cooperating with the upper pressing die are symmetrically arranged on the top of the vertical seat. The rotating die is rotatably arranged on the top of the vertical seat;

[0007] Limiting and clamping mechanisms are symmetrically arranged on both sides of the lower die set for positioning the plate to be bent placed on the lower die set;

[0008] A fixing frame is fixedly connected to the outer wall of the U-shaped frame. A bidirectional lead screw for connecting two limiting clamping mechanisms is rotatably connected to the fixing frame. A motor for rotating the bidirectional lead screw is fixedly installed on the U-shaped frame. During the rotation of the motor, the relative distance between the two limiting clamping mechanisms can be adjusted.

[0009] A positioning mechanism is arranged on the lower die set for preliminarily positioning the plate to be bent on the lower die set.

[0010] Preferably, a plurality of movable cavities are equidistantly arranged inside the vertical seat. Two groups of transmission components are symmetrically arranged inside each movable cavity. The transmission component includes a first connecting seat fixedly connected to the bottom of the movable cavity and a second connecting seat extending into the rotary die and fixedly connected to the rotary die. A connecting spring is arranged between the second connecting seat and the first connecting seat, and the upper and lower ends of the connecting spring are respectively connected to the second connecting seat and the first connecting seat.

[0011] Preferably, the positioning mechanism includes a bracket fixedly connected to the vertical seat, and the bracket is in a right-angle frame structure.

[0012] Preferably, a movable groove is penetrated through the bracket, and a laser pen is rotatably connected to the inner side of the movable groove. The light spot irradiated by the laser pen on the lower die set is exactly located at the middle position between the two rotary dies.

[0013] Preferably, the limiting clamping mechanism includes a right-angle plate. The bidirectional lead screw extends into the right-angle plate and is threadedly connected thereto. A positioning rod is fixed on each of the right-angle plates on both sides of the bidirectional lead screw. The positioning rod extends into the vertical seat and is slidably connected thereto.

[0014] Preferably, the limiting clamping mechanism further includes a push plate. The bottom of the push plate is located above the lower die set. An adjusting component for adjusting the position of the push plate is arranged between the push plate and the right-angle plate.

[0015] Preferably, the adjusting component includes a threaded cylinder rotatably connected to the right-angle plate and a threaded rod fixedly connected to the push plate. The threaded rod extends into the threaded cylinder and is threadedly connected thereto. Anti-slip strips are annularly arranged on the outer wall of the threaded cylinder.

[0016] Preferably, guiding and measuring components are symmetrically arranged on both sides of the adjusting component. The guiding and measuring components include a scale rod fixedly connected to the push plate and an outer cylinder fixedly connected to the right-angle plate. The scale rod extends into the outer cylinder and is slidably connected thereto.

[0017] The working principle and beneficial effects of the present utility model are as follows:

[0018] In the present utility model, a positioning mechanism is provided on the lower die set. Through the positioning mechanism, the plate to be bent can be preliminarily positioned on the lower die set, which is convenient for the staff to quickly locate the bending position on the plate to be bent. On both sides of the lower die set, limiting and clamping mechanisms are symmetrically arranged. A fixing frame is fixedly connected to the outer wall of the U-shaped frame. A bidirectional lead screw for connecting the two limiting and clamping mechanisms is rotatably connected to the fixing frame. A motor for rotating the bidirectional lead screw is fixedly installed on the U-shaped frame. During the rotation of the motor, the relative distance between the two limiting and clamping mechanisms can be adjusted to position the plate to be bent placed on the lower die set. Under the action of the limiting and clamping mechanism, by adjusting the structure of the limiting and clamping mechanism, when bending a large number of plates, only need to randomly place the plates on the two rotating dies, control the bidirectional lead screw to rotate through the motor, move the two limiting and clamping mechanisms closer to each other, and use the push plate on the limiting and clamping mechanism to automatically push and position the plate to be bent on the rotating die, without positioning each plate to be bent one by one, greatly improving the work efficiency and the bending quality, reducing the number of defective products, and having high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0020] Figure 1 Schematic three-dimensional structure diagram of the non-indentation lower die proposed by the present utility model;

[0021] Figure 2 Schematic three-dimensional structure diagram of the lower die set proposed by the present utility model;

[0022] Figure 3 Schematic internal assembly structure diagram of the upright seat proposed by the present utility model;

[0023] Figure 4 For Figure 2 Enlarged structure diagram at position B in

[0024] Figure 5 For Figure 1 Enlarged structure diagram at position A in

[0025] In the figure: 1, electric hydraulic actuator; 2, upper pressing die; 3, U-shaped frame; 4, motor; 5, positioning mechanism; 51, movable groove; 52, laser pointer; 53, bracket; 6, lower die set; 61, rotating die; 62, upright seat; 63, movable cavity; 64, transmission component; 641, first connecting seat; 642, connecting spring; 643, second connecting seat; 7, bidirectional lead screw; 8, fixing frame; 9, limiting and clamping mechanism; 91, positioning rod; 92, right-angle plate; 93, outer cylinder; 94, graduated rod; 95, push plate; 96, adjusting component; 961, threaded rod; 962, threaded cylinder; 963, anti-slip strip. Detailed implementation mode

[0026] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0027] Please refer to Figure 1 and Figure 2 , the non-indentation lower die includes: a U-shaped frame 3 and an upper pressing die 2 arranged inside the U-shaped frame 3. An electro-hydraulic device 1 for lifting the upper pressing die 2 is fixedly installed on the top of the U-shaped frame 3. A lower die set 6 is arranged at the bottom of the U-shaped frame 3. The lower die set 6 includes a vertical seat 62 fixedly installed at the bottom of the U-shaped frame 3. Two rotating dies 61 cooperating with the upper pressing die 2 are symmetrically arranged on the top of the vertical seat 62. The rotating die 61 is rotatably arranged on the top of the vertical seat 62. A plurality of movable cavities 63 are equidistantly opened inside the vertical seat 62. Two groups of transmission components 64 are symmetrically arranged inside each movable cavity 63. The transmission component 64 includes a first connecting seat 641 fixedly connected to the bottom of the movable cavity 63 and a second connecting seat 643 extending into the rotating die 61 and fixedly connected to the rotating die 61. A connecting spring 642 is arranged between the second connecting seat 643 and the first connecting seat 641. The upper and lower ends of the connecting spring 642 are respectively connected to the second connecting seat 643 and the first connecting seat 641. Place the plate to be bent on the two rotating dies 61. The gap between the two rotating dies 61 is the part of the plate to be bent. When the upper pressing die 2 presses down on the plate to bend it, both rotating dies 61 will flip accordingly, stretching the connecting spring 642. After bending and removing the plate, under the action of the connecting spring 642, the rotating die 61 resets.

[0028] Please refer to Figure 1 and Figure 2, a positioning mechanism 5 is provided on the lower die set 6 for preliminarily positioning the plate to be bent on the lower die set 6. Among them, the positioning mechanism 5 includes a bracket 53 fixedly connected to the vertical seat 62, and the bracket 53 is in a right-angled frame structure. An activity slot 51 is penetrated on the bracket 53, and a laser pen 52 is rotatably connected inside the activity slot 51. The light spot irradiated by the laser pen 52 on the lower die set 6 is exactly located at the middle position between the two rotary dies 61. Before bending the same batch of plates or a single plate, place the plate to be bent on the two rotary dies 61. Then, turn on the laser pen 52 and flip the laser pen 52 in the activity slot 51. It should be noted that the friction force between the laser pen 52 and the activity slot 51 is relatively large during rotation, and manual turning is required. Under the action of its own gravity, the laser pen 52 is not sufficient to cause automatic flipping. Rotate the laser pen 52 so that the light spot irradiated by the laser pen 52 falls on the upper surface of the plate to be bent. Since the light spot irradiated by the laser pen 52 on the lower die set 6 is exactly located at the middle position between the two rotary dies 61, the light spot irradiated on the upper surface of the plate to be bent is located on the straight line formed by the upcoming bending part, so as to well assist the worker to accurately place the plate to be bent on the lower die set 6.

[0029] Please refer to Figure 1 and Figure 2 , limiting and clamping mechanisms 9 are symmetrically arranged on both sides of the lower die set 6 for positioning the plate to be bent placed on the lower die set 6. A fixing frame 8 is fixedly connected to the outer wall of the U-shaped frame 3, and a bidirectional lead screw 7 for connecting the two limiting and clamping mechanisms 9 is rotatably connected to the fixing frame 8. A motor 4 for rotating the bidirectional lead screw 7 is fixedly installed on the U-shaped frame 3. During the rotation of the motor 4, the relative distance between the two limiting and clamping mechanisms 9 can be adjusted.

[0030] Among them, the limit clamping mechanism 9 includes a right-angle plate 92. The bidirectional lead screw 7 extends into the right-angle plate 92 and is threadedly connected thereto. A positioning rod 91 is fixed on each of the right-angle plates 92 on both sides of the bidirectional lead screw 7. The positioning rod 91 extends into the seat 62 and is slidably connected thereto. The limit clamping mechanism 9 further includes a push plate 95. The bottom of the push plate 95 is located above the lower module 6. An adjusting member 96 for adjusting the position of the push plate 95 is provided between the push plate 95 and the right-angle plate 92. Among them, the adjusting member 96 includes a threaded cylinder 962 rotatably connected to the right-angle plate 92 and a threaded rod 961 fixed to the push plate 95. The threaded rod 961 extends into the threaded cylinder 962 and is threadedly connected thereto. Anti-slip strips 963 are annularly arranged on the outer wall of the threaded cylinder 962. Guide and measurement components are symmetrically arranged on both sides of the adjusting member 96. The guide and measurement components include a scale rod 94 fixed to the push plate 95 and an outer cylinder 93 fixed to the right-angle plate 92. The scale rod 94 extends into the outer cylinder 93 and is slidably connected thereto. When bending a large number of plate parts of the same batch that need to be bent, place one of the plate parts to be bent on the two rotating dies 61, and use the laser pen 52 to irradiate a light spot to indicate the folding point position to be bent. After that, align the part to be bent on the plate part to be bent with the irradiated point. Then, start the motor 4. The motor 4 drives the bidirectional lead screw 7 to rotate through its output shaft, so that the two limit clamping mechanisms 9 can move in opposite directions. At this time, the two limit clamping mechanisms 9 are synchronously moved closer to each other. When one of the push plates 95 first contacts the side wall of the plate part to be bent (taking the example that the plate part to be bent is not bent at the exact middle position), the motor 4 pauses. Then, adjust the adjusting member 96 on the side of the push plate 95 that has not yet contacted the plate part to be bent. Rotate the threaded cylinder 962 through the anti-slip strips 963, so that the threaded rod 961 can move along the inner wall of the threaded cylinder 962, extend the threaded rod 961 outwards, so that the scale rod 94 slides out of the outer cylinder 93 until this push plate 95 also contacts the side wall of the plate part to be bent, and position the plate part to be bent through the two push plates 95. Then, the motor 4 controls the bidirectional lead screw 7 to reverse, so that the two limit clamping mechanisms 9 move away from each other. Then, bend the plate part through the upper pressing die 2. Since the structure of the two limit clamping mechanisms 9 has been adjusted when positioning the previous plate part, when bending subsequent large quantities of plate parts, just place the plate parts randomly on the two rotating dies 61, control the bidirectional lead screw 7 to rotate through the motor 4, move the two limit clamping mechanisms 9 closer to each other, and use the two push plates 95 to automatically push and position the plate parts to be bent on the rotating dies 61.

[0031] Working principle and usage process: Before bending the same batch of plate parts or a single plate part, place the plate part to be bent on the two rotating dies 61. Then, turn on the laser pointer 52 and flip the laser pointer 52 in the movable slot 51. It should be noted that the frictional force between the laser pointer 52 and the movable slot 51 is relatively large during rotation, and manual turning is required. Under the action of its own gravity, the laser pointer 52 is not sufficient to cause automatic flipping. Rotate the laser pointer 52 so that the light spot irradiated by the laser pointer 52 falls on the upper surface of the plate part to be bent. Since the light spot irradiated by the laser pointer 52 on the lower die 6 is exactly in the middle position between the two rotating dies 61, the light spot irradiated on the upper surface of the plate part to be bent is located on the straight line formed by the upcoming bending part. In this way, it can well assist the worker in accurately placing the plate part to be bent on the lower die 6.

[0032] When bending a large number of plate parts to be bent in the same batch, place one of the plate parts to be bent on the two rotating dies 61, and use the laser pointer 52 to irradiate a light spot to indicate the folding point position to be bent. After that, align the part to be bent on the plate part to be bent with the irradiated point. Then, start the motor 4. The motor 4 drives the bidirectional lead screw 7 to rotate through its output shaft, so that the two limit clamping mechanisms 9 can move in opposite directions. At this time, move the two limit clamping mechanisms 9 closer to each other synchronously. When one of the push plates 95 first contacts the side wall of the plate part to be bent (taking the example of bending the plate part to be bent not in the exact middle position), the motor 4 pauses. Then, adjust the adjusting component 96 on the side of the push plate 95 that has not yet contacted the plate part to be bent. Rotate the threaded barrel 962 through the anti-slip strip 963, so that the threaded rod 961 can move along the inner wall of the threaded barrel 962, extend the threaded rod 961 outwards, and make the scale rod 94 slide out of the outer cylinder 93 until this push plate 95 also contacts the side wall of the plate part to be bent, and position the plate part to be bent through the two push plates 95. Then, the motor 4 controls the bidirectional lead screw 7 to reverse, so that the two limit clamping mechanisms 9 move away from each other. Then, bend the plate part through the upper pressing die 2. Since the structure of the two limit clamping mechanisms 9 has been adjusted when positioning the previous plate part, when bending subsequent large quantities of plate parts, just place the plate parts randomly on the two rotating dies 61, start the motor 4, drive the bidirectional lead screw 7 to rotate, move the two limit clamping mechanisms 9 closer to each other, and use the two push plates 95 to automatically push and position the plate parts to be bent on the rotating die 61. There is no need to position each plate part to be bent one by one, which greatly improves work efficiency, enhances the bending quality, and reduces the number of defective products.

[0033] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. No indentation die, including: A U-shaped frame (3) and an upper die (2) arranged on the inner side of the U-shaped frame (3); an electric hydraulic device (1) for lifting the upper die (2) is fixedly installed on the top of the U-shaped frame (3); a lower die set (6) is arranged at the bottom of the U-shaped frame (3); the lower die set (6) comprises a stand (62) fixedly installed at the bottom of the U-shaped frame (3); two rotating dies (61) cooperating with the upper die (2) are symmetrically arranged on the top of the stand (62); the rotating dies (61) are rotatably arranged on the top of the stand (62); A limited position clamping mechanism (9) is symmetrically arranged on both sides of the lower die set (6) for positioning the plate to be bent placed on the lower die set (6); A fixing frame (8) is fixedly connected to the outer wall of the U-shaped frame (3); a bidirectional screw rod (7) for connecting two limit clamping mechanisms (9) is rotatably connected to the fixing frame (8); a motor (4) for rotating the bidirectional screw rod (7) is fixedly mounted on the U-shaped frame (3); and during the rotation of the motor (4), the relative distance between the two limit clamping mechanisms (9) can be adjusted; A positioning mechanism (5) is provided on the lower die set (6) for performing preliminary positioning of the plate to be bent on the lower die set (6).

2. The non-indentation lower die according to claim 1, characterized in that: A plurality of movable cavities (63) are equidistantly provided inside the stand (62), and two groups of transmission components (64) are symmetrically provided inside each movable cavity (63). The transmission components (64) include a first connection seat (641) fixedly connected to the bottom of the movable cavity (63) and a second connection seat (643) extending into the interior of the rotating mold (61) and fixedly connected to the rotating mold (61), and a connection spring (642) is provided between the second connection seat (643) and the first connection seat (641), and the upper and lower ends of the connection spring (642) are respectively connected to the second connection seat (643) and the first connection seat (641).

3. The non-indentation lower die according to claim 1, characterized in that: The positioning mechanism (5) comprises a bracket (53) fixedly connected to the stand (62), and the bracket (53) is in a right-angle frame structure.

4. The non-indentation lower die according to claim 3, characterized in that: A movable groove (51) is formed through the bracket (53), and a laser pen (52) is rotatably connected inside the movable groove (51). The light spot irradiated by the laser pen (52) on the lower mold assembly (6) is located exactly in the middle of the two rotating molds (61).

5. The non-indentation lower die according to claim 1, characterized in that: The position limiting clamping mechanism (9) comprises a right-angle plate (92), the bidirectional screw rod (7) extends into the interior of the right-angle plate (92) and is threadedly connected thereto, a positioning rod (91) is fixed to the right-angle plate (92) on both sides of the bidirectional screw rod (7), and the positioning rod (91) extends into the interior of the stand (62) and is slidably connected thereto.

6. The non-indentation lower die according to claim 5, characterized in that: The position-limiting clamping mechanism (9) further comprises a push plate (95), the bottom of which is located on the upper side of the lower die set (6), and an adjusting component (96) for adjusting the position of the push plate (95) is provided between the push plate (95) and the right-angle plate (92).

7. The non-indentation lower die according to claim 6, characterized in that: The adjusting component (96) comprises a threaded barrel (962) rotatably connected to the right-angle plate (92) and a threaded rod (961) fixedly connected to the push plate (95); the threaded rod (961) extends into the interior of the threaded barrel (962) and is threadedly connected thereto; and anti-slip strips (963) are provided in a circular array on the outer wall of the threaded barrel (962).

8. The non-indentation lower die according to claim 7, characterized in that: Guide measurement assemblies are symmetrically arranged on both sides of the adjustment component (96), and the guide measurement assemblies include a scale rod (94) fixedly connected to the push plate (95) and an outer cylinder (93) fixedly connected to the right-angle plate (92), and the scale rod (94) extends into the interior of the outer cylinder (93) and is slidably connected thereto.

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