CN216027527U

CN216027527U - Mould suitable for numerical control center of bending

Info

Publication number: CN216027527U
Application number: CN202122277321.4U
Authority: CN
Inventors: 徐丰羽; 华德荣; 马凯威
Original assignee: Nanjing University of Posts and Telecommunications
Current assignee: Nanjing University of Posts and Telecommunications
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-03-15
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a die suitable for a numerical control bending center, which comprises an upper die body, a self-locking mechanism and a pressing mechanism, wherein the self-locking mechanism is arranged on the upper die body; the self-locking mechanism comprises a fixed inclined block and a locking block; the fixed inclined block is positioned in an inverted U-shaped groove at the bottom of the cross beam, the fixed inclined block is provided with an inclined plane, and the locking block can stretch into the inverted U-shaped groove under the driving of the pressing mechanism to lock the tenon in the inverted U-shaped groove. The pressing mechanism can be self-locked, when the included angle between a second connecting rod in the pressing mechanism and the vertical direction is close to zero, the pressing mechanism is in a self-locking position, and the pressing mechanism can be kept still no matter how large F is. Furthermore, the self-locking mechanism can be self-locked, namely, the self-locking inclined plane of the fixed inclined block is matched with the self-locking inclined plane of the locking block and can ensure stillness no matter how large F is.

Description

Mould suitable for numerical control center of bending

Technical Field

The utility model relates to the field of numerical control bending, in particular to a die suitable for a numerical control bending center.

Background

At present, the metal plate processing industry is typical of small-batch and multi-variety metal plate processing industry, and the switching of products is very frequent. Therefore, frequent die change operation is required, and domestic manual die change operation obviously cannot meet the use requirement. The flexibility of the equipment requires that the mould can be automatically replaced and clamped, which is a bottleneck preventing the bending center from being automatically flexible and developing intelligently and is a technical problem which must be broken through.

In recent years, the numerical control bending center is developed quickly in the market of domestic numerical control plate processing equipment, and due to high processing efficiency and automation degree, the processing efficiency is 2-3 times that of the traditional numerical control bending machine, and the market demand is large.

The mold is used as a core component of a numerical control bending center, the conventional clamping mainly depends on manual clamping, and the locking modes mainly comprise 'screw locking' and 'pressure plate locking', and the two modes can not realize automatic clamping. Meanwhile, the clamping reliability is poor, and the machining precision is influenced. Because the bending center bears loads in the horizontal direction and the vertical direction in the machining process, the die turning shown in fig. 3 and 4 can occur in the stress process in the two locking modes, the machining precision of the machine tool is seriously influenced, and the precision cannot be compensated. Both the two modes are locked by external force and are unreliable in locking.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art, and provides a die suitable for a numerical control bending center, which adopts a self-locking mechanism and a pressing mechanism, thereby realizing double self-locking, and being safe and reliable.

In order to solve the technical problems, the utility model adopts the technical scheme that:

a die suitable for a numerical control bending center comprises an upper die body, a self-locking mechanism and a pressing mechanism.

The upper die body is detachably arranged at the bottom of a cross beam at the bending center, the height of the cross beam can be lifted, an inverted U-shaped groove is formed in the bottom of the cross beam, and the inverted U-shaped groove is provided with a first side leg and a second side leg.

The top of the upper die body is provided with a tenon which extends into the inverted U-shaped groove and is tightly matched with the inner wall surface of one side leg.

The self-locking mechanism comprises a fixed inclined block and a locking block; the side wall of the fixed inclined block facing the locking block is an inclined plane.

The fixed oblique block is positioned in the inverted U-shaped groove between the tenon and the second side leg.

The locking block can stretch into the inverted U-shaped groove under the driving of the pressing mechanism to lock the tenon in the inverted U-shaped groove.

The fixed oblique block is provided with a self-locking oblique surface, and the inclination angle of the self-locking oblique surface is alpha, so that alpha is less than arctan (mu); wherein mu is the friction coefficient of the self-locking inclined surface.

The fixed inclined block is arranged in the inverted U-shaped groove and is in contact with the side legs; the locking block is positioned between the fixed inclined block and the tenon.

A sliding pair is formed between the locking block and the upper die body, an inclined surface is arranged on one side, facing the fixed inclined block, of the locking block, and the inclined surface of the locking block can be attached to the inclined surface of the fixed inclined block or the self-locking inclined surface.

The locking block is positioned between the fixed inclined block and the tenon.

A sliding pair is formed between the locking block and the upper die body, an inclined surface is arranged on one side, facing the fixed inclined block, of the locking block, and a sliding pair can be formed between the self-locking inclined surface of the locking block and the inclined surface or the self-locking inclined surface of the fixed inclined block.

The number of the fixed inclined blocks is two, namely a fixed inclined block I and a fixed inclined block II.

The first fixed inclined block is arranged in the inverted U-shaped groove and is in contact with the side legs.

The second fixed oblique block is arranged on the tenon, and the inclined surface or the self-locking inclined surface of the second fixed oblique block is opposite to the inclined surface or the self-locking inclined surface of the first fixed oblique block.

The locking block is located between the first fixed inclined block and the second fixed inclined block and is wedge-shaped, and the locking block is in sliding fit with at most one of inclined planes of the first fixed inclined block and the second fixed inclined block or the self-locking inclined plane.

The first fixed inclined block is slidably mounted in the inverted U-shaped groove and is arranged close to the second side leg.

The locking block is located between the first fixed inclined block and the second fixed inclined block and is wedge-shaped, and the locking block is in sliding fit with the inclined plane or the self-locking inclined plane of the first fixed inclined block and the inclined plane or the self-locking inclined plane of the second fixed inclined block.

The pressing mechanism comprises a first connecting rod and a second connecting rod which are hinged with each other; the other end of the first connecting rod is hinged with the locking block, and the other end of the second connecting rod is hinged with the upper die body.

The pressing mechanism comprises a first connecting rod, a connecting block and a linear driving device; the top end of the first connecting rod is hinged with the locking block, the bottom end of the first connecting rod is hinged with the top of the connecting block, and the bottom of the connecting block is hinged with the upper die body; the middle part of the connecting block is hinged with the linear driving device, and the other end of the linear driving device is hinged on the upper die body.

Also comprises a hook and a hook ejection device.

And a transverse hook groove communicated with the inverted U-shaped groove is formed in the first side leg.

The couple symmetry is laid in last mould body top both sides, and all articulated mutually with last mould body through the articulated shaft in every couple middle part.

The hook can rotate around the hinge shaft under the driving of the hook ejection device, and the claw of the hook can extend into the transverse hook groove.

The bottoms of the two hooks on the two sides of the upper die body are connected through a guide pin.

A horizontal guide groove is formed in the upper die body, and the guide pin is located in the horizontal guide groove.

The bottom of each hook is provided with a guide pin groove, and the guide pin can move in the guide pin groove.

The guide pin is positioned in the horizontal guide groove.

A spring is arranged in the horizontal guide groove at one side departing from the hook ejection device, a guide block is sleeved in the middle of the guide pin, one end of the guide block can be in contact with the spring, and the other end of the guide block can be in contact with the hook ejection device;

the hook ejection device can drive the guide pin to move along the horizontal guide groove, so that the hook is driven to rotate, and the claw of the hook extends into the transverse hook groove.

The utility model has the following beneficial effects:

1. self-locking of the self-locking mechanism when a < arctan (mu)); wherein a is the inclination angle of the fixed inclined block or the locking block, and mu is the friction coefficient of the self-locking inclined plane. The self-locking mechanism can self-lock, namely no matter how large F is, the inclined plane is matched to ensure that the self-locking mechanism is still.

2. The hold-down mechanism is self-locking, when angle beta is close to zero degree, the hold-down mechanism is in the self-locking position, no matter how big F is, the hold-down mechanism can both guarantee the stillness. Wherein beta is an included angle between the second connecting rod and the vertical direction;

3. the mould presss from both sides tightly reliably, and the change of external load no matter size, direction, position can not influence mould clamping reliability and stability, and precision.

4. According to the utility model, the clamping operation device and the release driving device which are arranged on the manipulator can be used for rapidly clamping and releasing the mould without providing a power source.

5. According to the utility model, the hook and the hook ejection device are arranged, so that the upper die body and the cross beam can be automatically disassembled and assembled, and the hook can be used for hooking the cross beam after the upper die is installed, so that the upper die is prevented from falling off, and the upper die is stable and reliable. When the hook needs to be disassembled and assembled, the hook ejection device is ejected out, the hook rotates clockwise, and the hook is released from hook connection with the transverse hook groove.

Drawings

Fig. 1 is an overall structural view of a bending center in the present invention.

FIG. 2 is a schematic view of bending a plate at a bending center according to the present invention; wherein, fig. 2(a) shows a positive angle bending schematic diagram; fig. 2(b) shows a negative angle bending diagram.

FIG. 3 is a schematic diagram illustrating the prior art turning over when using a bolt for locking; wherein fig. 3(a) shows a schematic diagram without flipping; FIG. 3(b) shows a schematic diagram of the tip-over under vertical load; FIG. 3(c) shows a schematic diagram of the rollover under horizontal load;

FIG. 4 is a schematic diagram illustrating the prior art turning over when the pressing plate is used for locking; wherein fig. 4(a) shows a schematic diagram without flipping; FIG. 4(b) shows a schematic diagram of the tip-over under vertical load; FIG. 4(c) shows a schematic diagram of the rollover under horizontal load;

fig. 5 is a structural diagram of a die suitable for a numerically controlled bending center in embodiment 1 of the present invention.

FIG. 6 is a schematic diagram of the self-locking of a polygonal bending center die according to the present invention; FIG. 6(a) shows a schematic self-locking diagram; fig. 6(b) shows a schematic view of the clamping.

FIG. 7 illustrates a first self-locking mechanism of the present invention; FIG. 7(a) shows a schematic self-locking diagram; fig. 7(b) shows a schematic view of the clamping.

FIG. 8 illustrates a second self-locking mechanism of the present invention; FIG. 8(a) shows a schematic self-locking diagram; fig. 8(b) shows a schematic view of the clamping.

FIG. 9 illustrates a third self-locking mechanism of the present invention; FIG. 9(a) shows a schematic self-locking diagram; fig. 9(b) shows a schematic view of the clamping.

FIG. 10 is a fourth self-locking mechanism; FIG. 10(a) shows a schematic view of the self-locking mechanism; fig. 10(b) shows a schematic view of the clamping.

FIG. 11 shows a fifth self-locking mechanism of the present invention; FIG. 11(a) shows a schematic self-locking diagram; FIG. 11(b) shows a clamping schematic; FIG. 11(c) is a schematic view showing the locking block being a round ball and the self-locking inclined surface being a special-shaped curved surface; fig. 11(d) shows the locking block is an elliptical ball, and the self-locking inclined surface is a special-shaped curved surface.

FIG. 12 shows a sixth self-locking mechanism of the present invention; FIG. 12(a) shows a schematic view of the self-locking mechanism; FIG. 12(b) shows a clamping schematic; FIG. 12(c) is a schematic view showing the locking block being a round ball and the self-locking inclined surface being a special-shaped curved surface; fig. 12(d) shows the locking block is an elliptical ball, and the self-locking inclined surface is a special-shaped curved surface.

FIG. 13 is a first hold-down mechanism; FIG. 13(a) shows a schematic view of the self-locking mechanism; fig. 13(b) shows a schematic view of the clamping.

FIG. 14 is a second hold-down mechanism; FIG. 14(a) shows a schematic view of the self-locking mechanism; fig. 14(b) shows a schematic view of the clamping.

FIG. 15 is a third hold-down mechanism; FIG. 15(a) shows a schematic view of the self-locking mechanism; fig. 15(b) shows a schematic view of the clamping.

Fig. 16 is a side view of a die suitable for a numerically controlled bending center in embodiment 2 of the present invention.

Fig. 17 is a sectional view taken along line a-a in fig. 16.

Fig. 18 is a schematic structural view when the hook is opened in embodiment 2 of the present invention.

Fig. 19 is a perspective view of a die suitable for a numerically controlled bending center in embodiment 2 of the present invention.

Fig. 20 is a sectional view of a die suitable for a numerically controlled bending center in embodiment 2 of the present invention.

Fig. 21 is a partial sectional view of a die suitable for use in a digitally controlled bending center in example 2.

FIG. 22 is a schematic view of the self-locking mechanism of the present invention; FIG. 22(a) is a schematic view showing the self-locking of the self-locking bevel; fig. 22(b) shows a schematic diagram of the self-locking mechanism of the pressing mechanism.

FIG. 23 is a schematic view of an automatic disassembly; FIG. 23(a) shows a schematic view of the self-locking mechanism; fig. 22(b) shows an automatic detachment diagram.

FIG. 24 is a schematic view of an additional adjustment pad between the upper mold body and the cross member.

Among them are:

10. bending the center; 11. folding the C-shaped beam; 111. upward bending a knife; 112. downward bending a knife;

12. a cross beam; 121. a U-shaped groove is inverted; 122. a transverse hook groove; 123. a first side leg; 124. a second side leg;

13. a frame; 14. a mold assembly; 15. an upper die; 16. a lower die;

20. an upper die body;

21. a tenon; 22. an upper presser foot; 24. a hook mounting groove; 25. a guide hole; 26. a horizontal guide groove;

30. hooking; 31. hinging a shaft; 32. a guide pin; 33. a guide block; 34. a spring; 35. a guide pin groove;

40. an ejection device; 41. a first ejector rod; 42. a second ejector rod;

50. a self-locking mechanism;

51. fixing the inclined block; 511. a central positioning mounting rod; 512. a side dam;

52. a locking block; 521. a hollow cavity; 522. a locking block guide groove;

53. fixing the first inclined block; 54. fixing a second inclined block; 55. a rectangular gap;

60. a plate material;

70. a hold-down mechanism; 71. a first connecting rod; 72. a second connecting rod; 73. a linear drive device; 74. connecting blocks;

80. an adjustment pad;

90. a clamping operation device; 91. the operating means is released.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

As shown in fig. 1 to 2, the bending center 10 includes a flanged C-beam 11, a cross beam 12, a frame 13, and a die assembly 14.

The hemming C-beam 11 is used for bending the panel 60, can move horizontally and vertically, and has an upper bending blade 111 and a lower bending blade 112. Wherein the upper bending blade can be used for negative angle bending of the plate material, as shown in fig. 2 (a). The down-comer can be used for positive angle bending of sheet material as shown in fig. 2 (b).

The cross beam is arranged on the frame at the upper part in front of the folded C-shaped beam 11, the height of the cross beam can be lifted, as shown in fig. 5, an inverted U-shaped groove 121 is arranged at the bottom of the cross beam, and the inverted U-shaped groove is provided with a first edge leg 123 and a second edge leg 124. In this embodiment, the leg is preferably located adjacent to the hemmed C-beam at the center of the bend.

And a transverse hook groove 122 communicated with the inverted U-shaped groove is formed in the cross beam on one side. Further, a lateral hanger groove 122 is provided on a lateral hanger groove side wall adjacent to one side of the hem C-beam in the bending center.

The die assembly 14 includes a lower die 16 and a plurality of upper dies 15.

The lower die is arranged on the machine frame right below the cross beam.

A plurality of go up mould 15 and lay in the crossbeam bottom in parallel, every goes up mould, also is a mould that is applicable to numerical control center of bending in this application.

The utility model is explained in detail below with reference to two preferred embodiments.

Example 1

As shown in fig. 5, 6 and 7, a die suitable for a numerical control bending center includes an upper die body 20, a self-locking mechanism 50 and a pressing mechanism 70.

The top of the upper die body is provided with a tenon 21 which extends into the inverted U-shaped groove and is tightly matched with one inner wall surface of the side leg. Preferably, an adjustment pad 80, as shown in fig. 24, is also provided between the tenon and the first leg. The die is worn due to long-term use. When the die wears, a shim can be used and the thickness of the shim adjusted. At this moment, the locking positions of the fixed inclined block and the locking block can be correspondingly changed, and the adjustment of front and back precision can be realized, so that the whole die body is not scrapped.

The self-locking mechanism has the following six preferred embodiments.

First self-locking mechanism

As shown in fig. 7, the first self-locking mechanism includes a fixed ramp 51 and a locking block 52.

The fixed inclined block is fixedly arranged in the inverted U-shaped groove and is in contact with the side legs; a self-locking inclined plane is arranged on one side of the fixed inclined block facing the tenon, and the inclination angle of the self-locking inclined plane is alpha, so that alpha is less than arctan (mu); wherein mu is the friction coefficient of the self-locking inclined surface.

The locking block is positioned between the fixed inclined block and the tenon.

The locking block and the upper die body form sliding pair restraint, one side of the locking block, which faces the fixed inclined block, is provided with an inclined surface, and the self-locking inclined surface of the locking block can be attached to the inclined surface (preferably the self-locking inclined surface) of the fixed inclined block.

When the locking block moves downwards, the self-locking mechanism is unlocked; the locking block moves upwards to lock the self-locking mechanism, namely the self-locking inclined planes of the locking block and the self-locking mechanism are completely attached.

Second self-locking mechanism

As shown in fig. 8, the second self-locking mechanism includes a fixed ramp 51 and a locking block 52.

The fixed swash block is arranged adjacent to the second side leg, and in this embodiment, the fixed swash block is preferably horizontally slidably mounted on the tenon with a vertical gap 55 between the fixed swash block and the second side leg.

A self-locking inclined plane is arranged on one side of the fixed inclined block facing the tenon, and the inclination angle of the self-locking inclined plane is alpha, so that alpha is less than arctan (mu); wherein mu is the friction coefficient of the self-locking inclined surface. The following arrangement of the self-locking ramp is referred to and will not be described in detail.

The locking block is located between the fixed inclined block and the tenon, a sliding pair is formed between the locking block and the upper die body, an inclined plane, preferably a self-locking inclined plane, is arranged on one side, facing the fixed inclined block, of the locking block, and the sliding pair can be formed between the self-locking inclined plane of the locking block and the self-locking inclined plane of the fixed inclined block. When the locking block moves downwards, the self-locking mechanism is unlocked; the locking block moves upwards to lock the self-locking mechanism; at this time, the sliding of the fixed oblique block horizontally slides towards the second side leg to extrude the vertical gap.

As a preferred mode, but not limited to the detailed structure shown in the figure, the fixing oblique block is preferably installed on the tenon as shown in fig. 19, 20 and 21. A vertical locking block guide groove 522 is formed in the center of the side wall, close to the locking block, of the tenon, and the locking block is clamped in the locking block guide groove and can vertically slide along the locking block guide groove 522; further, the locking block is preferably a hollow structure having a hollow cavity 521.

The fixed oblique block comprises a center positioning installation rod 511 and two side baffles 512, wherein the center positioning installation rod passes through the vertical sliding groove and the middle cavity of the locking block so as to be installed on the tenon head and can horizontally slide. The central positioning installation rod can also limit the vertical displacement of the locking block while playing the roles of installation positioning and horizontal sliding.

In fig. 19, two side guards are positioned on the front and back sides of the locking block to prevent forward and backward displacement.

Third self-locking mechanism

As shown in fig. 9, the third self-locking mechanism includes a first fixed inclined block 53, a second fixed inclined block 54 and a locking block 52.

The first fixed inclined block is fixedly arranged in the inverted U-shaped groove and is in contact with the side legs.

The second fixed oblique block is arranged on the tenon, and the inclined surface (preferably self-locking inclined surface) of the second fixed oblique block and the inclined surface (preferably self-locking inclined surface) of the first fixed oblique block are arranged oppositely.

The latch segment is located between fixed sloping block one and the fixed sloping block two, and is the wedge, and latch segment and fixed sloping block one and two inclined planes of fixed sloping block two or from at most one sliding fit in the auto-lock inclined plane, also promptly:

1. the locking block is matched with a trapezoidal bevel edge (namely a self-locking bevel edge) of the first fixed bevel block.

2. The locking block is matched with the trapezoidal bevel edge (namely the self-locking bevel edge) of the second fixed bevel block.

3. The locking block is not matched with the self-locking inclined planes of the first fixed inclined block and the second fixed inclined block, but does not fall off, and is in a free state in the wedge-shaped groove. The locking block moves downwards to unlock the self-locking mechanism, and the locking block moves upwards to lock the self-locking mechanism.

Fourth self-locking mechanism

As shown in fig. 10, the fourth self-locking mechanism includes a first fixed swash block 53, a second fixed swash block 54, and a locking block 52.

The first fixed inclined block is slidably mounted in the inverted U-shaped groove and is arranged close to the second side leg, and a vertical gap is preferably formed between the first fixed inclined block and the second side leg.

The locking block is located between the first fixed inclined block and the second fixed inclined block and is wedge-shaped, and the locking block is in sliding fit with the inclined plane (preferably self-locking inclined plane) of the first fixed inclined block and the inclined plane (preferably self-locking inclined plane) of the second fixed inclined block.

The locking block moves downwards to unlock the self-locking mechanism; the locking block moves upwards to lock the self-locking mechanism; at the moment, the first fixed oblique block slides horizontally towards the second side leg to extrude the vertical gap.

Fifth self-locking mechanism

As shown in fig. 11, the fifth self-locking mechanism includes a fixed inclined block 51 and a locking block 52.

The fixed oblique block is fixedly arranged in the inverted U-shaped groove and is in contact with the side legs.

The locking block is located between the fixed inclined block and the tenon and is preferably a round ball or an oval ball, and the inclined plane of the fixed inclined block is preferably an inclined plane or a special-shaped curved surface.

The setting of above-mentioned dysmorphism curved surface can adjust the size of locking force, reduces the stroke of locking piece among the locking process. For example, the slope in the locked position is as small as possible to increase the locking force, and the slope in the unlocked position is slightly larger to reduce the locking stroke.

When the locking block moves downwards, the self-locking mechanism is unlocked, and the locking block moving upwards is clamped in the chute, so that the self-locking mechanism is locked.

Sixth self-locking mechanism

As shown in fig. 12, the sixth self-locking mechanism includes a first fixed swash block 53, a second fixed swash block 54, and a locking block 52.

And the second fixed oblique block is arranged on the tenon.

The inclined plane (preferably self-locking inclined plane) of the second fixed inclined block and the inclined plane (preferably self-locking inclined plane) of the first fixed inclined block are arranged oppositely and are inclined planes or special-shaped curved surfaces.

The locking block is located between the first fixed inclined block and the second fixed inclined block and is preferably a round ball or an oval ball.

The advantages of the above-mentioned special-shaped curved surface arrangement are similar to the fifth self-locking mechanism, and are not described herein again.

The above-described pressing mechanism is explained in detail by using the following three preferred embodiments.

Embodiment 1 of pressing mechanism

As shown in fig. 13, the pressing mechanism includes a first connecting rod 71 and a second connecting rod 72 hinged to each other, the other end of the first connecting rod is hinged to the locking block, and the other end of the second connecting rod is hinged to the upper die body.

Embodiment 2 of pressing mechanism

As shown in fig. 14, the pressing mechanism is a linear driving device 73, one end of which is hinged with the locking block, and the other end is hinged on the upper die body.

Embodiment 3 of pressing mechanism

As shown in fig. 15, the pressing mechanism includes a first link 71, a second link 72, a linear driving device 73, and a connecting block 74.

The connecting block is preferably triangular in shape, having three hinge points.

One end of the first connecting rod is hinged with the locking block, the other end of the first connecting rod is hinged with a hinged point (namely a hinged point at the top) of the connecting block, a second hinged point (namely a hinged point at the middle part) of the connecting block is hinged with the linear driving device 73, and the other end of the linear driving device is hinged on the upper die body; the third hinge point (namely the bottom hinge point) of the connecting block is hinged on the upper die body.

The self-locking mechanism and the pressing mechanism can realize self-locking, and are double self-locking, safe and reliable in practice.

The self-locking mechanism is self-locking, as shown in fig. 22(a), when a < arctan (μ)), where α is the inclination angle of the fixed or locking block, and μ is the friction coefficient of the self-locking inclined surface. The self-locking mechanism can self-lock, namely no matter how large F is, the inclined plane is matched to ensure that the self-locking mechanism is still.

Self-locking of the hold-down mechanism, as shown in fig. 22(b), when the angle β is small enough (i.e., close to 0 degrees), the hold-down mechanism is in the self-locking position, i.e., the hold-down mechanism is still regardless of the size of F. Wherein beta is an included angle between the second connecting rod and the vertical direction.

Therefore, the die is reliable in clamping, and the clamping reliability, stability and precision of the die cannot be influenced by changes of external loads in size, direction and position.

Example 2

Basically the same as example 1, except that: a die suitable for a numerical control bending center further comprises a hook 30 and a hook ejection device 40 shown in figures 16 to 21.

And a transverse hook groove 24 communicated with the inverted U-shaped groove is formed in the first side leg.

The hooks are symmetrically arranged on two sides of the top of the upper die body, and the middle part of each hook is hinged with the upper die body through a hinge shaft 31.

The bottoms of the two hooks on the two sides of the upper die body are connected through a guide pin 32.

A horizontal guide groove 26 is arranged in the upper die body, and the guide pin is positioned in the horizontal guide groove.

Further, the bottom of each hook is preferably provided with a guide pin groove 35, in which the guide pin can also move.

The guide pin is positioned in the horizontal guide groove, and the hook ejection device can drive the guide pin to move along the horizontal guide groove so as to drive the hook to rotate and enable the hook claw of the hook to extend into the transverse hook groove.

Furthermore, a spring is arranged in a horizontal guide groove on one side, which is far away from the hook ejection device, a guide block is sleeved in the middle of the guide pin, one end of the guide block can be in contact with the spring, and the other end of the guide block can be in contact with the hook ejection device.

The hook ejection device comprises a first ejector rod 41 and a second ejector rod, wherein the first ejector rod can extend into the horizontal guide groove and is used for tightly ejecting the driving block; the second ejector rod and the ejector rod are arranged in parallel, and mainly have a balanced and symmetrical guiding function.

As shown in fig. 23, the clamping operation means 90 and the release driving means 91 provided on the robot (not shown) can rapidly clamp and release the mold without providing a power source. Due to the requirements of quick clamping and automatic die change, a power source is usually provided for a die assembly, which is a great problem (the arrangement of a circuit is difficult), and the die assembly can be disassembled and assembled without providing an external power source for the die, so that the die assembly is convenient. In addition, due to the arrangement of the hook and the hook ejection device, the upper die body and the cross beam can be automatically disassembled and assembled, and the hook can be used for hanging the cross beam after the upper die is installed, so that the upper die is prevented from falling off, and the upper die is stable and reliable. When the hook needs to be disassembled and assembled, the hook ejection device is ejected out, the hook rotates clockwise, and the hook is released from hook connection with the transverse hook groove.

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims

1. The utility model provides a mould suitable for numerical control center of bending which characterized in that: comprises an upper die body, a self-locking mechanism and a pressing mechanism;

the upper die body is detachably arranged at the bottom of a cross beam in the bending center, the height of the cross beam can be lifted, and an inverted U-shaped groove is formed in the bottom of the cross beam and provided with a first side leg and a second side leg;

the top of the upper die body is provided with a tenon which extends into the inverted U-shaped groove and is tightly matched with one inner wall surface of the side leg;

the self-locking mechanism comprises a fixed inclined block and a locking block; the side wall of the fixed inclined block facing the locking block is an inclined plane;

the fixed inclined block is positioned in the inverted U-shaped groove between the tenon and the second side leg;

2. The die suitable for the numerical control bending center according to claim 1, wherein: the inclined plane of the fixed inclined block is a self-locking inclined plane, the inclination angle of the self-locking inclined plane is alpha, and alpha is less than arctan (mu); wherein mu is the friction coefficient of the self-locking inclined surface.

3. The die suitable for the numerical control bending center according to claim 1 or 2, wherein: the fixed inclined block is arranged in the inverted U-shaped groove and is in contact with the side legs; the locking block is positioned between the fixed inclined block and the tenon;

a sliding pair is formed between the locking block and the upper die body, an inclined surface is arranged on one side, facing the fixed inclined block, of the locking block, and the inclined surface or the self-locking inclined surface of the locking block can be attached to the inclined surface of the fixed inclined block.

4. The die suitable for the numerical control bending center according to claim 1 or 2, wherein: the locking block is positioned between the fixed inclined block and the tenon;

a sliding pair is formed between the locking block and the upper die body, an inclined surface is arranged on one side, facing the fixed inclined block, of the locking block, and a sliding pair can be formed between the inclined surface of the locking block and the inclined surface of the fixed inclined block or the self-locking inclined surface.

5. The die suitable for the numerical control bending center according to claim 1 or 2, wherein: the number of the fixed inclined blocks is two, namely a fixed inclined block I and a fixed inclined block II;

the first fixed inclined block is arranged in the inverted U-shaped groove and is in contact with the two side legs;

the second fixed oblique block is arranged on the tenon head, and the inclined surface or the self-locking inclined surface of the second fixed oblique block is arranged opposite to the inclined surface or the self-locking inclined surface of the first fixed oblique block;

6. The die suitable for the numerical control bending center according to claim 1 or 2, wherein: the number of the fixed inclined blocks is two, namely a fixed inclined block I and a fixed inclined block II;

the first fixed inclined block is slidably arranged in the inverted U-shaped groove and is adjacent to the second side leg;

7. The die suitable for the numerical control bending center according to claim 1, wherein: the pressing mechanism comprises a first connecting rod and a second connecting rod which are hinged with each other; the other end of the first connecting rod is hinged with the locking block, and the other end of the second connecting rod is hinged with the upper die body.

8. The die suitable for the numerical control bending center according to claim 1, wherein: the pressing mechanism comprises a first connecting rod, a connecting block and a linear driving device; the top end of the first connecting rod is hinged with the locking block, the bottom end of the first connecting rod is hinged with the top of the connecting block, and the bottom of the connecting block is hinged with the upper die body; the middle part of the connecting block is hinged with the linear driving device, and the other end of the linear driving device is hinged on the upper die body.

9. The die suitable for the numerical control bending center according to claim 1, wherein: the hook ejection device comprises a hook and a hook ejection device;

a transverse hook groove communicated with the inverted U-shaped groove is formed in the first side leg;

the hooks are symmetrically arranged on two sides of the top of the upper die body, and the middle part of each hook is hinged with the upper die body through a hinge shaft;

10. The die suitable for the numerical control bending center according to claim 8, wherein: the bottoms of the two hooks on the two sides of the upper die body are connected through a guide pin;

a horizontal guide groove is formed in the upper die body, and the guide pin is positioned in the horizontal guide groove;

the bottom of each hook is provided with a guide pin groove, and the guide pin can move in the guide pin groove;

the guide pin is positioned in the horizontal guide groove;