CN219966176U - Material clamping and turning structure - Google Patents

Abstract

The embodiment of the utility model relates to the field of part processing and discloses a clamping, cutting and turning structure which comprises a male die, wherein the male die comprises a flanging part; the upper die holder is provided with a flanging piece and an upper cutter, the flanging piece is used for flanging the workpiece, and the flanging piece and the upper cutter move along a first direction and are respectively provided with one side of a flanging part; the lower die holder is provided with a lower cutter, the lower cutter is arranged between the flanging part and the upper cutter, and is matched with the upper cutter along a first direction to form a trimming blade, and the lower cutter and the flanging part are oppositely arranged along the first direction; the lower cutter moves along a first direction under the action of the flanging piece, and the lower cutter is close to the flanging part and one side of the lower cutter abuts against the flanging; the material pressing piece is arranged on one side of the lower cutter, which is far away from the flanging part, and the material pressing piece provides clamping pressure for flanging. By applying the technical scheme of the utility model, the flanging width can be increased, synchronous flanging is realized, the strength of the flanging piece is increased, the flanging piece is not easy to damage, the part of the lower cutter becomes a material clamping and flanging pressing surface, and the phenomenon of surface product wrinkling is improved.

Description

Material clamping and turning structure

Technical Field

The utility model relates to the technical field of part processing, in particular to a clamping, cutting and turning structure.

Background

The stamping process generally comprises the process methods of drawing, trimming, flanging and the like, and in the stamping field, for trimming and flanging to be carried out simultaneously, a clamping and turning structure is formed, so that trimming and flanging of some parts of the outer plate class are simultaneously carried out.

The flanging part and the upper cutter in the clamping and turning structure in the related art are positioned at the inner side of the lower cutter, the outer side of the upper cutter and the inner side of the lower cutter form cutter edges, the flanging part is used for flanging the workpiece, and the pressing part is positioned at the outer side of the lower cutter so as to provide clamping pressure for flanging.

But because turn-ups spare and last cutter all are located the inboard of cutter down for cut the width ratio of turning over the region less, and the intensity of swage is enough, makes the turn-ups produce the fold, causes the face concave, and because the width of cutting the region of turning over is less moreover, the intensity that makes the turn-ups spare of design is also less, easily damaged the ring.

Disclosure of Invention

The clamping and turning structure provided by the embodiment of the utility model can be applied to the technical scheme of the utility model, the width of the turned edge can be increased, the synchronous turned edge is realized, the strength of the turned edge piece is increased, the turned edge piece is not easy to damage, the part of the lower cutter is changed into a clamping and turning material pressing surface, and the phenomenon of surface product wrinkling is improved.

The embodiment of the utility model provides a clamping, cutting and turning structure which comprises a male die, an upper die holder, a lower die holder and a pressing piece, wherein the male die comprises a flanging part, and the flanging part is used for placing flanging of a workpiece; the upper die holder is provided with a flanging part and an upper cutter, the flanging part is used for flanging the workpiece on the flanging part, and the flanging part and the upper cutter move along a first direction relative to the upper die holder and are respectively provided with one side of the flanging part; the lower die holder is provided with a lower cutter, the lower cutter is arranged between the flanging part and the upper cutter and is matched with the upper cutter along a first direction to form a trimming knife edge, the lower cutter and the flanging piece are oppositely arranged along the first direction, the lower cutter moves relative to the lower die holder along the first direction under the action of the flanging piece, when the flanging piece is far away from the flanging of the workpiece, the lower cutter is close to the flanging, and one side of the lower cutter, which is close to the flanging part, can be abutted against the flanging of the workpiece; the material pressing piece is arranged on one side, far away from the flanging part, of the lower cutter, and the material pressing piece provides clamping pressure for the flanging.

According to the material clamping and turning structure provided by the embodiment of the utility model, as the lower cutter is arranged on the inner side of the upper cutter, the lower cutter is opposite to the flanging part, so that the edge cutting edge formed by the lower cutter and the upper cutter is positioned on the outer side of the lower cutter, and in addition, the lower cutter is opposite to the flanging part, so that the width of the flanging area is not influenced by the arrangement of the lower cutter on the inner side. Compared with the prior art that the upper cutter and the flanging piece are both positioned at the inner side of the lower cutter and share the position of the flanging area, the embodiment of the utility model can increase the width of the flanging area and realize synchronous flanging by arranging the lower cutter at the inner side of the upper cutter and arranging the lower cutter opposite to the flanging piece. Besides, when the flanging piece is far away from the flanging of the workpiece, the lower cutter is close to the flanging, and one side of the lower cutter close to the flanging part can be abutted against the flanging of the workpiece, so that the part of the lower cutter is changed into a material pressing surface for clamping and flanging, and the phenomenon of wrinkling of the surface product is further improved.

In one implementation manner provided by the embodiment of the utility model, an elastic piece is arranged between the lower cutter and the lower die holder, and the elastic direction of the elastic piece is the same as the first direction.

In one implementation manner provided by the embodiment of the utility model, the material pressing piece is arranged on the lower die holder, moves along the first direction relative to the lower die holder, and the lower cutter is fixed on the lower die holder.

In one implementation manner provided by the embodiment of the utility model, the flanging piece and the upper cutter are fixed into a whole.

In one implementation manner provided by the embodiment of the utility model, the distance between one side of the flanging piece, which is close to the lower cutter, and the lower cutter along the first direction is greater than the distance between one side of the upper cutter, which is close to the lower cutter, and the lower cutter along the first direction.

In one implementation manner provided by the embodiment of the utility model, the material pressing piece and the lower die holder are provided with guide assemblies along the first direction so as to limit the deviation of the material pressing piece and the lower die holder when moving along the first direction.

In one implementation manner provided by the embodiment of the utility model, the guide assembly comprises a guide rod arranged on the pressing piece and a guide hole arranged on the lower die holder, the axial direction of the guide hole is the same as the first direction, and the guide rod extends into the guide hole.

In one implementation manner provided by the embodiment of the utility model, the material pressing piece is provided with the material guiding inclined plane, and the upper end of the material guiding inclined plane extends to the bottom end of one side of the lower cutter away from the flanging part.

In one implementation manner provided by the embodiment of the utility model, the upper die holder is provided with a plurality of flanging parts and a plurality of upper cutters, and the lower die holder is provided with a plurality of lower cutters, and the flanging parts, the upper cutters and the lower cutters are arranged in one-to-one correspondence.

In one implementation manner provided by the embodiment of the utility model, the male die comprises a placing part, the placing part is used for placing a workpiece, and the clamping and turning structure comprises a pressing piece, and the pressing piece is matched with the placing part to press the workpiece on the placing part.

Drawings

FIG. 1 is a schematic diagram of a structure of a material clamping and turning structure according to an embodiment of the present utility model;

FIG. 2 is a second schematic diagram of a structure of a material clamping and turning structure according to an embodiment of the present utility model;

fig. 3 is an isometric view of a swage provided in an embodiment of the present utility model;

fig. 4 is a top view of a material clamping and turning structure provided by an embodiment of the utility model;

fig. 5 is a cross-sectional view of A-A in fig. 4 provided in accordance with an embodiment of the present utility model.

Reference numerals illustrate:

1-a male die; 11-a flange part; 12-a placement part; 2-a workpiece; 21-flanging; 3-an upper die holder; 31-flanging parts; 32-an upper cutter; 4-a lower die holder; 41-lower cutter; 5-pressing a material piece; 51-a material guiding inclined plane; 6-a guide assembly; 7-pressing piece.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments of the present utility model and the technical features of the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present utility model and should not be construed as unduly limiting the present utility model.

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the specific technical solutions of the present utility model will be described in further detail below with reference to the accompanying drawings in the embodiments of the present utility model. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In embodiments of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the embodiments of the present utility model, the terms "upper," "lower," "left," and "right," etc., are defined with respect to the orientation in which the components in the drawings are schematically disposed, and it should be understood that these directional terms are relative terms, which are used for descriptive and clarity with respect to each other, and which may vary accordingly with respect to the orientation in which the components in the drawings are disposed.

In embodiments of the present utility model, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either a fixed connection, a removable connection, or an integral unit; can be directly connected or indirectly connected through an intermediate medium.

In embodiments of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment of the present utility model is not to be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The embodiment of the utility model provides a clamping and turning structure, which is applied to the field of stamping processes for trimming and flanging of outer plate parts, can solve the problem of wrinkling in the flanging process, solves the problem of flanging rebound, reduces the risk of drawing, lower carving and rectifying of outer plates, and shortens the rectifying period.

Wherein, the parts of the outer plate like the outer plate of the door and the outer plate of the cover are often arranged and positioned accurately by modeling reasons (the outer skin is pore-free) and the characteristics of the product cannot be utilized. Therefore, in order to ensure accurate positioning in the production process of the outer plate die, the design of the stamping process can design a triangular positioning hole in the residual meat of the outer process of the product as the positioning of the subsequent process, and then the final sequence of trimming and flanging is carried out simultaneously.

The stamping process generally comprises processes of drawing, trimming, flanging and the like, specifically, drawing can also be called drawing, calendaring and the like, and refers to a mechanical processing process for stamping a flat blank with a certain shape obtained after blanking into various open hollow parts or reducing the diameter of the open hollow blank and increasing the height by utilizing a die; trimming is a machining process of cutting edges of parts which are already subjected to forming machining; and the flanging is a stamping process step of using a die to return the hole edge or the outer edge on the plate.

Specifically, referring to fig. 1 and 2, the material clamping, cutting and turning structure provided by the embodiment of the utility model comprises a male die 1, an upper die holder 3, a lower die holder 4 and a material pressing piece 5, wherein the male die 1 comprises a flanging part 11, and the flanging part 11 is used for placing a flanging 21 of a workpiece 2; the upper die holder 3 is provided with a flanging piece 31 and an upper cutter 32, the flanging piece 31 is used for flanging the workpiece 2 on the flanging part 11, and the flanging piece 31 and the upper cutter 32 move along a first direction relative to the upper die holder 3 and are both provided with one side of the flanging part 11; the lower die holder 4 is provided with a lower cutter 41, the lower cutter 41 is arranged between the flanging part 11 and the upper cutter 32, and is matched with the upper cutter 32 along a first direction to form a trimming blade, the lower cutter 41 and the flanging piece 31 are oppositely arranged along the first direction, the lower cutter 41 moves along the first direction relative to the lower die holder 4 under the action of the flanging piece 31, when the flanging piece 31 is far away from the flanging 21 of the workpiece 2, the lower cutter 41 is close to the flanging 21, and one side of the lower cutter 41 close to the flanging part 11 can be abutted against the flanging 21 of the workpiece 2; the pressing member 5 is provided on a side of the lower cutter 41 away from the burring part 11, and the pressing member 5 provides a nip pressure to the burring 21.

Since the lower cutter 41 is disposed on the inner side of the upper cutter 32, the lower cutter 41 is disposed opposite to the burring piece 31, so that the trimming edge formed by the lower cutter 41 and the upper cutter 32 is located on the outer side of the lower cutter 41, and in addition, the lower cutter 41 is disposed opposite to the burring piece 31, so that the lower cutter 41 is disposed on the inner side without affecting the width of the burring area. Compared with the prior art that the upper cutter and the flanging piece are both positioned at the inner side of the lower cutter and share the flanging region, the embodiment of the utility model can increase the width of the flanging region by arranging the lower cutter 41 at the inner side of the upper cutter 32 and arranging the lower cutter 41 opposite to the flanging piece 31, thereby realizing synchronous flanging, and in addition, the selection of the flanging piece 31 is not influenced by the width of the flanging region, so that the strength of the flanging piece 31 is increased and is not easy to damage. In addition, when the flanging member 31 is far away from the flanging 21 of the workpiece 2, the lower cutter 41 is close to the flanging 21, and one side of the lower cutter 41 close to the flanging portion 11 can be abutted against the flanging 21 of the workpiece 2, so that the part of the lower cutter 41 becomes a material pressing surface for clamping and flanging, and the phenomenon of wrinkling of the surface product is further improved.

It should be noted that, the side of the lower cutter 41 near the flanging part 11 may abut against the flanging 21 of the workpiece 2, the material pressing member 5 is disposed on the side of the lower cutter 41 far away from the flanging part 11, and the material pressing member 5 provides a material clamping pressure for the flanging 21, so that the side of the lower cutter 41 near the flanging part 11 becomes a material clamping and turning material pressing surface.

The male die 1 is also called a punch pin, a punch head, a male die, an upper die and the like, and the male die 1 is a part for forming the inner surface of a product in the die, namely, a part taking the appearance as a working surface. The main function is to shape parts of the inner surface of the article. The male die 1 is divided into a guiding male die, a primary male die, a secondary male die, a tooth-extracting male die, a hexagonal male die, a forming male die, a sector male die and the like according to different materials, shapes and purposes.

Further, the flanging member 31 moves along the first direction relative to the upper die holder 3, and a flanging power member is arranged between the upper die holder 3 and the flanging member 31 and can drive the flanging member 31 to move up and down along the first direction. The flanging power part can be driven by a motor, can be driven by a cylinder, and can be driven by a mechanical structure, so that the embodiment of the utility model is not limited. Because the cylinder drive has the advantages of low requirements on users, simple principle and structure of the cylinder, large output torque, strong adaptability and the like, in the implementation mode provided by the embodiment of the utility model, the flanging power part is driven by the cylinder.

Likewise, further, the upper cutter 32 moves in a first direction relative to the upper die holder 3, and an upper cutter power member is disposed between the upper die holder 3 and the upper cutter 32, and the upper cutter power member can drive the upper cutter 32 to move up and down in the first direction. The upper cutter power member may be driven by a motor, the upper cutter power member may be driven by a cylinder, and the upper cutter power member may be driven by a mechanical structure, which is not limited in this embodiment of the present utility model. Because of the advantages of low requirement on a user by the cylinder drive, simple principle structure of the cylinder, large output torque, strong adaptability and the like, in the implementation manner provided by the embodiment of the utility model, the cylinder drive is selected as the power part of the upper cutter 32.

In addition, referring to fig. 1 and 2, the flanging member 31 and the upper cutter 32 may both move along the first direction relative to the upper die holder 3, and the flanging member 31 and the upper cutter 32 may be designed separately or may be designed as an integral body. Compared with the split design of the flanging piece 31 and the upper cutter 32, the flanging piece 31 and the upper cutter 32 are required to be respectively arranged on the upper die holder 3, and the defects of long installation time and poor installation precision of the assembly position between the flanging piece 31 and the upper cutter 32 are also considered.

As can be seen from the above embodiments, a flanging power member may be disposed between the upper die holder 3 and the flanging member 31 to drive the flanging member 31 to move up and down along the first direction relative to the upper die holder 3, and an upper cutter power member may be disposed between the upper die holder 3 and the upper cutter 32 to drive the upper cutter 32 to move up and down along the first direction relative to the upper die holder 3. Since the flanging member 31 and the upper cutter 32 are fixed as a whole, one of the flanging power member and the upper cutter power member may be selected.

The flange member 31 and the upper cutter 32 are fixed integrally, and the fixing manner may be not only non-detachable fixing, such as welding, gluing or riveting, but also detachable fixing, such as threaded connection, snap connection, etc., which is not limited in this embodiment of the present utility model. Compared with the non-detachable fixing, the detachable fixing is selected, so that the flange piece 31 and any part in the upper cutter 32 can be conveniently maintained and replaced when damaged. Thus, in a preferred embodiment of the present utility model, the flange member 31 is removably secured to the upper cutter 32.

Since the burring piece 31 is used to burre the workpiece 2 on the burring portion 11, and the upper cutter 32 and the lower cutter 41 form a trimming blade to trim the workpiece 2, the displacement of the burring 21 piece and the upper cutter 32 in the first direction is always the same if the burring piece 31 and the upper cutter 32 are fixed as one body. In other words, when the upper cutter 32 and the lower cutter 41 are contacted to form the trimming blade to trim the workpiece 2, the flanging member 31 performs the flanging 21 simultaneously, so that defects such as non-smoothness or a certain inclination angle are generated on the plane of the trimming, and the workpiece is easily scratched.

In order to avoid such a problem, the distance between the side of the flanging member 31 close to the lower cutter 41 and the lower cutter 41 along the first direction is greater than the distance between the side of the upper cutter 32 close to the lower cutter 41 and the lower cutter 41 along the first direction, so that the upper cutter 32 forms a trimming edge with the lower cutter 41 to trim the workpiece 2, and after the workpiece 2 is trimmed, the upper cutter 32 and the flanging member 31 continue to move along the first direction at a position close to the lower cutter 41, so that the workpiece 2 is flanged on the flanging portion 11. When the flanging is completed, the flanging member 31 and the upper cutter 32 are away from each other in the first direction, and the side of the lower cutter 41, which is close to the flanging portion 11, can abut against the flanging 21 of the workpiece 2, so that the portion of the lower cutter 41 becomes the pressing surface for the clamping and the flanging. Referring to fig. 1 and 2, the upper cutter 32, the flange member 31 and the lower cutter 41 are all of sickle-like design, the upper cutter 32 is embedded in the inner contour of the flange member 31, and the flange member 31 and the upper cutter 32 are oppositely arranged along the first direction.

In some other embodiments provided by the present utility model, the lower cutter 41 moves in the first direction relative to the lower die holder 4 under the action of the flanging member 31, when the flanging member 31 is away from the flanging 21 of the workpiece 2, the lower cutter 41 is close to the flanging 21, and a side of the lower cutter 41 close to the flanging portion 11 may abut against the flanging 21 of the workpiece 2. Therefore, a lower cutter power member should be disposed between the lower cutter 41 and the lower die holder 4, and the lower cutter power member should be matched with the flanging power member, so that when the flanging member 31 is far away from the flanging 21 of the workpiece 2, the lower cutter 41 is close to the flanging 21, and a side of the lower cutter 41 close to the flanging portion 11 can abut against the flanging 21 of the workpiece 2.

Of course, the lower cutter power member may be an elastic member, that is, an elastic member is disposed between the lower cutter 41 and the lower die holder 4, and the elastic direction of the elastic member is the same as the first direction. When the turn-up member 31 approaches the turn-up 21 of the workpiece 2 in the first direction, the turn-up member 31 is pressed against the lower cutter 41 in the first direction, the elastic member is pressed, when the turn-up member 31 is away from the turn-up 21 of the workpiece 2 in the first direction, the turn-up member 31 is away from the lower cutter 41 in the first direction, the elastic member is elongated, the lower cutter 41 approaches the turn-up 21, and a side of the lower cutter 41 near the turn-up portion 11 may abut against the turn-up 21 of the workpiece 2.

On the basis of this, the blanking member 5 is arranged on the lower die holder 4 and is movable in a first direction relative to the lower die holder 4, and the lower cutter 41 is fixed to the blanking member 5. The pressing member 5 does not need to avoid the lower cutter 41 to locally reinforce, so that the strength of the pressing member 5 can be directly increased, and in addition, a part of the lower cutter 41 also becomes a part of the pressing member 5, so that the strength of the pressing member 5 is ensured without widening the pressing member 5.

Referring to fig. 2, 3, 4 and 5, since the width of the turning area is generally smaller, and if the pressing member 5 moves along the first direction relative to the lower die holder 4, if the guiding assembly 6 is not provided, the positions of the upper cutter 32 and the lower cutter 41 for forming the trimming edge are unstable, and shake occurs, so that the trimming chips of the workpiece 2 are increased, the production is affected, and even the upper cutter 32 and/or the lower cutter 41 collapse. For this purpose, in one implementation manner provided in the embodiment of the present utility model, the swage 5 and the lower die holder 4 are provided with guide assemblies 6 along the first direction so as to limit the displacement of the swage 5 and the lower die holder 4 when moving along the first direction.

For example, the guide assembly 6 may be a plurality of guide plates disposed on the die holder 4, the plurality of guide plates enclosing a shape corresponding to an outer contour of the swage 5 and extending in a direction of movement of the swage 5 relative to the die holder 4 in a first direction to limit the displacement of the swage 5 when moving in the first direction relative to the die holder 4. Of course, the guide assembly 6 may also be a guide rod disposed on the pressing member 5 and a guide hole disposed on the lower die holder 4, the axial direction of the guide hole is the same as the first direction, and the guide rod extends into the guide hole to limit the deviation of the pressing member 5 when moving along the first direction relative to the lower die holder 4. The specific structure and implementation of the guide assembly 6 are not limited by the embodiment of the present utility model.

Further, the guide members 6 may be provided in one or more, and the number of the guide members 6 is not limited in the embodiment of the present utility model. In order to provide accurate guidance, the present utility model provides a preferred embodiment in which the guide assembly 6 can be provided in a plurality. On the basis, a plurality of guide assemblies 6 can be uniformly distributed between the material pressing piece 5 and the lower die holder 4.

In other embodiments provided by the present utility model, after the upper cutter 32 and the lower cutter 41 cooperate to cut the edge of the workpiece 2, waste is generated, and the waste can directly fall, at this time, the falling position of the waste cannot be determined, and the waste may fall on the clamping and cutting structure, so that the clamping and cutting structure cannot work normally, and may also fall on an operator, and the operator is damaged. In order to avoid such problems and to buffer the falling speed of the waste, the present utility model provides a preferred embodiment, in which a guiding inclined surface 51 is provided on the pressing member 5, and the upper end of the guiding inclined surface 51 extends to the bottom end of the side of the lower cutter 41 away from the flanging portion 11, so that the waste can slowly fall from the guiding inclined surface 51, not only the falling speed of the waste can be buffered, but also the waste can be guided to a predetermined position.

In the process of stamping forming, the workpiece 2 may only need to process one flanging 21, so that only one flanging piece 31 and one upper cutter 32 need to be arranged on the upper die holder 3, and only one lower cutter 41 need to be arranged at a position corresponding to the lower die holder 4. However, the workpiece 2 may also need to be machined with a plurality of flanges 21, for which, in the embodiment of the present utility model, a plurality of flanges 31 and a plurality of upper cutters 32 are provided on the upper die holder 3, a plurality of lower cutters 41 are provided on the lower die holder 4, and the plurality of flanges 31, the plurality of upper cutters 32 and the plurality of lower cutters 41 are provided in a one-to-one correspondence.

The punch 1 includes, in addition to the burring portion 11, and is provided with a placement portion 12 for placing the workpiece 2, and the sandwiching and turning structure includes a pressing piece 7, the pressing piece 7 being engaged with the placement portion 12 to press the workpiece 2 against the placement portion 12. The pressing piece 7 presses the workpiece 2 on the placing part 12, so that the workpiece 2 on the placing part 12 is prevented from moving when the flanging piece 31 is flanging 21, the flanging 21 cannot be achieved or the flanging 21 is poor in effect, wrinkles are generated, and the surface is concave.

The above description is not intended to limit the scope of the utility model, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides a press from both sides material and cut turn over structure which characterized in that includes:

the male die comprises a flanging part, wherein the flanging part is used for placing flanging of a workpiece;

the upper die holder is provided with a flanging piece and an upper cutter, the flanging piece is used for flanging the workpiece on the flanging part, and the flanging piece and the upper cutter move along a first direction relative to the upper die holder and are both arranged on one side of the flanging part;

the lower die holder is provided with a lower cutter, the lower cutter is arranged between the flanging part and the upper cutter and is matched with the upper cutter along the first direction to form a trimming blade, the lower cutter and the flanging piece are oppositely arranged along the first direction, the lower cutter moves along the first direction relative to the lower die holder under the action of the flanging piece, when the flanging piece is far away from the flanging of the workpiece, the lower cutter is close to the flanging, and one side of the lower cutter, which is close to the flanging part, can be abutted against the flanging of the workpiece;

the material pressing piece is arranged on one side, far away from the flanging part, of the lower cutter, and the material pressing piece provides material clamping pressure for the flanging.

2. The material clamping and turning structure according to claim 1, wherein an elastic member is arranged between the lower cutter and the lower die holder, and the elastic direction of the elastic member is the same as the first direction.

3. The pinch-off and turn-over structure of claim 1 wherein the swage is disposed on the lower die holder and moves in the first direction relative to the lower die holder, the lower cutter being secured to the swage.

4. The structure of claim 1, wherein the flange is integrally fixed to the upper cutter.

5. The structure of claim 4, wherein a distance between a side of the flanging member adjacent to the lower cutter and the lower cutter along the first direction is greater than a distance between a side of the upper cutter adjacent to the lower cutter and the lower cutter along the first direction.

6. The pinch-off and turn-over structure of claim 3 wherein said swage and said lower die holder are provided with guide assemblies along said first direction to limit deflection of said swage and said lower die holder as they move along said first direction.

7. The structure according to claim 6, wherein the guide assembly comprises a guide rod of the pressing member and a guide hole in the lower die holder, the axial direction of the guide hole is the same as the first direction, and the guide rod is disposed in the guide hole.

8. The material clamping and turning structure according to claim 3, wherein a material guiding inclined plane is arranged on the material pressing piece, and the upper end of the material guiding inclined plane extends to the bottom end of one side, away from the flanging part, of the lower cutter.

9. The material clamping and turning structure according to claim 1, wherein a plurality of flanging pieces and a plurality of upper cutters are arranged on the upper die holder, a plurality of lower cutters are arranged on the lower die holder, and the flanging pieces, the upper cutters and the lower cutters are arranged in a one-to-one correspondence.

10. The pinch-cut and turn structure according to claim 1, wherein the punch includes a placement portion for placing a workpiece, the pinch-cut and turn structure including a pressing piece that cooperates with the placement portion to press the workpiece against the placement portion.