CN218395584U - Negative angle bending die - Google Patents

Abstract

The utility model relates to a mould field of bending relates to a negative angle mould of bending, the utility model discloses a: the upper die assembly comprises a male die, the lower die assembly comprises a female die plate, a channel is arranged in the middle of the female die plate, two groups of female die inserts are symmetrically arranged on two side walls in the channel and rotate through a rotating shaft to connect the inner wall of the channel, limiting plates are arranged on the inner sides of the female die inserts, an opening is formed between the female die inserts, the width of the opening is increased upwards, an ejection spring is arranged in the opening, the top of the ejection spring is provided with an inner top plate, the male die is arranged right above the channel, the section width of the male die is increased downwards and is arranged, the width of the bottom of the male die is smaller than or equal to the width of the top of the opening, technical transformation is carried out in a male and female die of the bending die, the male die and the female die of the bending die are bent by a negative angle, the parallelism of a bending surface is guaranteed, and the size range is reached.

Description

Negative angle bending die

Technical Field

The utility model relates to a mould field of bending relates to a negative angle mould of bending.

Background

The existing bending pieces are roughly divided into V-shaped, U-shaped, Z-shaped and other complicated bending shapes. The parts having these shapes are required to have the following shapes and accuracies: 1. the sizes of all parts of the bending part and the bending angles thereof, the distance between the central hole and the reference surface and the distance between the hole and the reference surface meet the requirements. 2. The bent part is required to be ensured to be in an accurate angle meeting the requirement of a drawing, and the springback factor of the raw material is considered. 3. The bent part should not be distorted, and the surface of the bending surface should be smooth and clean without obvious scratch. The main reasons for the defects are: 1. the higher the assembly precision of the die, the higher the design precision of the positioning structure and the concave-convex die, and the higher the obtained bending size. 2. The mechanical property components and the thickness of the material also influence the rebound phenomenon after bending, and the larger the thickness is, the higher the material density is, and the larger the bending resistance is, the smaller the rebound is; conversely, the larger the spring back, the more likely the phenomenon of twisting or warping occurs. 3. The workpiece is asymmetric in shape, and the larger the bending size deviation of the workpiece with larger size. 4. The relative bending radius is large, in the bending process, the bending radius of the section of the bending part is small, the rebound value is relatively large, and the bending fracture or the bending part fracture is easy to occur due to the small bending radius.

According to the sheet metal part for producing the elevator accessory-conductor, the sheet metal part is made of the red copper sheet, the density is lower and the material is softer compared with a cold-rolled steel sheet, so that after the sheet metal part is bent, the resilience is higher, when two surfaces of the sheet metal part are bent, although the sheet metal part is bent on the same reference surface, the two bent surfaces are different in the same plane, a bent part with an asymmetric surface is formed, and the R angle radius of the bent surface is 2.5mm and has a certain radian. In the bending process, after the 90-degree angle male die is bent, the bending width distances of the two surfaces of the male die are out of tolerance, the resilience is very large, the product percent of pass is reduced, and a negative angle bending die needs to be designed for solving the problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a negative angle bending die for solving the problems of the prior art.

The purpose of the utility model can be realized by the following technical proposal: a negative angle bending die comprises: the upper die assembly comprises a male die, the lower die assembly comprises a female die plate, a channel is arranged in the middle of the female die plate, two groups of female die inserts are symmetrically arranged on two side walls in the channel and are rotatably connected with the inner wall of the channel through a rotating shaft, a limiting plate is arranged on the inner side of each female die insert, an opening is formed between the two groups of female die inserts, the width of the opening is increased upwards, an ejection spring is arranged in the opening, an inner top plate is arranged at the top of the ejection spring, the male die is arranged right above the channel, the width of the section of the male die is increased downwards, and the width of the bottom of the male die is smaller than or equal to the width of the top of the opening.

In a further improvement, the bottom of the male die is provided with an arc-shaped groove which is sunken upwards.

In a further improvement, the upper die assembly further comprises an upper die plate and an upper fixing plate, the upper die plate is fixedly connected with the upper fixing plate through bolts, the male die is fixedly connected with the upper die plate through bolts, the lower die assembly further comprises a lower die plate, the lower die plate is fixedly connected with the female die plate through bolts, and the upper die plate is connected with the lower die plate through guide pillars.

In a further improvement, a first pin is arranged between the upper template and the upper fixing plate, and a second pin is arranged between the lower template and the concave template.

The improved structure is characterized in that a lower die foot is arranged at the lower end of the lower die plate, and a lower die foot plate is arranged at the bottom of the lower die foot.

Compared with the prior art, the utility model discloses negative angle bending die's beneficial effect:

the downward increase setting of terrace die cross-section width, the wall of bending of terrace die becomes an angle, the rotation angle of this angle cooperation die mold insert, the ascending increase setting of opening width between the die mold insert, the terrace die atress makes the roof push down, the die mold insert is along with the angle rotation, when the limiting plate contact of roof bottom surface and die mold insert, the sheet metal component forms inward book angle degree naturally, then the sheet metal component outwards kick-backs to ninety degrees under the resilience characteristic effect of self, the utility model discloses mould simple structure, convenient operation has carried out the technological transformation in the mould concavo-convex of bending, lets it carry out the bending of a negative angle to the work piece, has guaranteed the depth of parallelism of the face of bending, reaches dimensional range.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a schematic structural view of the utility model before bending

FIG. 3 is the schematic structural diagram of the present invention during bending

Fig. 4 is the structure schematic diagram after bending

Figure 5 is the utility model discloses a structure schematic diagram that die mold insert part is locally enlarged

FIG. 6 is the schematic structural diagram of the bottom amplification of the male die of the present invention

FIG. 7 is a schematic view of a structure for processing a workpiece

FIG. 8 is a schematic side view of a workpiece

In the figure, 1-an upper die assembly, 11-a male die, 111-an arc-shaped groove, 12-an upper die plate, 13-an upper fixing plate, 14-a pin I, 15-an upper limiting block, 16-a lower limiting block, 2-a lower die assembly, 21-a female die plate, 22-a channel, 23-a lower die plate, 24-a pin II, 25-a lower die foot, 26-a lower die plate, 3-a female die insert, 31-a rotating shaft, 32-a limiting plate, 4-an opening, 5-an ejection spring, 6-an inner top plate, 7-a guide pillar and 8-a sheet metal part.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solution of the present invention will be further explained with reference to the following embodiments and accompanying drawings 1 to 8.

Example 1

The utility model provides a negative angle mould of bending, includes mould assembly 1 and lower mould assembly 2, it includes terrace die 11 to go up mould assembly 1, lower mould assembly 2 includes cavity die board 21, cavity die board 21 middle part is equipped with passageway 22, both sides wall symmetry is equipped with two sets of die inserts 3 in the passageway 22, die insert 3 rotates through pivot 31 and connects the 22 inner walls of passageway, and 3 inboard sides of die insert are equipped with limiting plate 32, and are two sets of be equipped with opening 4 between the die insert 3, the upwards increase setting of opening 4 width, be equipped with ejecting spring 5 in the opening 4, ejecting spring 5 top is equipped with roof 6, terrace die 11 sets up directly over passageway 22, the downward increase setting of terrace die 11 cross-section width, 11 bottom widths of terrace die are less than or equal to opening 4 top widths. The upper die assembly 1 further comprises an upper die plate 12 and an upper fixing plate 13, the upper die plate 12 is fixedly connected with the upper fixing plate 13 through bolts, the male die 11 is fixedly connected with the upper die plate 12 through bolts, the lower die assembly 2 further comprises a lower die plate 23, the lower die plate 23 is fixedly connected with the female die plate 21 through bolts, and the upper die plate 12 is connected with the lower die plate 23 through a guide pillar 7. A first pin 14 is arranged between the upper template 12 and the upper fixing plate 13, and a second pin 24 is arranged between the lower template 23 and the concave template 21. An upper limiting block 15 and a lower limiting block 16 are arranged between the upper template 12 and the lower template 23.

As shown in fig. 7 and 8, fig. 7 shows a sheet metal part 8 of an elevator fitting-conductor, and the material is red copper. The technology describes the bending at two positions of the first bending part 81 and the second bending part 82, and the chamfer angle is 2.5. After a common 90-degree angle male die is bent, the bending width distance A of two surfaces exceeds the error required by the actual size due to the resilience effect.

Therefore, the technical problem is solved by the mold of the utility model, specifically, the upper mold plate 12, the upper fixing plate 13 and the male mold 11 are respectively positioned by the first pin 14 and fixed by bolts; the concave die plate 21 and the concave die insert 3 are fixed by bolts and then connected with the lower die plate 23, are positioned by a pin II 24 and fixed by bolts, and the guide posts 7 are respectively arranged on the upper die plate 12 and the lower die plate 23 to play a role in guiding and limiting.

During operation, the punch press drives the upper die plate 12, so that the male die 11 is stressed downwards to extrude the inner top plate 6 and the ejection spring 5, at the moment, the product is bent naturally, the upper limiting block 15 contacts with the lower limiting block 16, the punch press stops working, the ejection spring 5 rebounds to drive the inner top plate 6, and the finished sheet metal part 8 is ejected out of the die insert 3 of the die.

As shown in fig. 5 and 6, the section width of the punch 11 is increased downwards, the bent wall of the punch forms an angle which is smaller than 90 degrees, the punch herein is selected to be in the range of 88-89 degrees according to the actual situation of the product, the angle is designed according to the rotation angle of the die insert, and the width of the opening 4 is increased upwards.

As shown in fig. 1 to 5, the inner top plate 6 is pressed down by the force of the male die 11, the female die insert 3 rotates along with the angle, when the bottom surface of the inner top plate 6 contacts with the limit plate 32 of the female die insert 3, at this time, the bending is finished, the sheet metal part 8 naturally forms an inward bending angle, two bending surfaces of the sheet metal part 8 are not parallel, and a point inward bending angle smaller than 90 degrees is formed, when the male die 11 is upward, the ejection spring 8 acts on the inner top plate 6 to drive the female die insert 3 to turn outward, return to the initial state and eject the sheet metal part 8. The sheet metal part 8 rebounds outwards to 90 degrees under the action of the self rebounding characteristic.

The utility model discloses mould simple structure, convenient operation, mould work portion is through handling the back, and long service life should not wear and tear to it is simple, convenient, quick to change. Meanwhile, the bending precision of the bending die reaches a unified standard through multiple bending measurements, the produced product has stable size, high precision and extremely low reject ratio, the technology is improved in a concave-convex die of the bending die, the workpiece is bent at a negative angle, the parallelism of a bending surface is ensured, and the size range is reached.

As a further embodiment, the bottom of the male die 11 is provided with an arc-shaped groove 111 which is concave upwards. As shown in fig. 6, the arc-shaped groove 111 has a structure with two ends being low and the middle being high, so that firstly, the bending stress is increased, secondly, the resilience of the workpiece is considered, the surface of the workpiece on the surface may be arched during punching, and the male die is provided with a little margin space, so that the workpiece is not easy to deform and crush due to the action of extrusion on the surface when being stressed.

As a further embodiment, a lower mold foot 25 is arranged at the lower end of the lower mold plate 23, and a lower mold foot plate 26 is arranged at the bottom of the lower mold foot 25. The lower mold leg 25 and the lower mold leg plate 26 are set to match the mold clamping height of the machine tool.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (5)

1. The utility model provides a negative angle mould of bending, includes upper die assembly and lower die assembly, upper die assembly includes the terrace die, lower die assembly includes the die board, its characterized in that, the die board middle part is equipped with the passageway, both sides wall symmetry is equipped with two sets of die inserts in the passageway, the die insert rotates the connecting channel inner wall through the pivot, and the die insert inboard is equipped with the limiting plate, and is two sets of be equipped with the opening between the die insert, the opening width upwards increases the setting, be equipped with ejecting spring in the opening, ejecting spring top is equipped with the roof, the terrace die sets up directly over the passageway, terrace die cross-section width increases the setting downwards, terrace die bottom width less than or equal to opening top width.

2. The negative angle bending die according to claim 1, wherein the bottom of the male die is provided with an arc-shaped groove which is concave upwards.

3. The negative angle bending die according to claim 1, wherein the upper die assembly further comprises an upper die plate and an upper fixing plate, the upper die plate is fixedly connected with the upper fixing plate through bolts, the male die is fixedly connected with the upper die plate through bolts, the lower die assembly further comprises a lower die plate, the lower die plate is fixedly connected with the female die plate through bolts, and the upper die plate is connected with the lower die plate through guide pillars.

4. The negative angle bending die according to claim 3, wherein a first pin is arranged between the upper die plate and the upper fixing plate, and a second pin is arranged between the lower die plate and the cavity plate.

5. The negative angle bending die of claim 3, wherein a lower die leg is arranged at the lower end of the lower die plate, and a lower die foot plate is arranged at the bottom of the lower die leg.

Images