CN216095953U

CN216095953U - Stretch forming die structure and stretching equipment

Info

Publication number: CN216095953U
Application number: CN202122006476.4U
Authority: CN
Inventors: 陈立枚
Original assignee: JIANGMEN ANNUOTE COOKING UTENSILS MANUFACTURING CO LTD
Current assignee: JIANGMEN ANNUOTE COOKING UTENSILS MANUFACTURING CO LTD
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-03-22
Anticipated expiration: 2031-08-24

Abstract

The utility model discloses a stretching forming die structure and stretching equipment with the same, wherein the stretching forming die structure comprises a stretching male die, a stretching female die, a blank holder assembly and a material pressing die. The stretching female die is arranged above the stretching male die in a vertically movable manner, and a forming space for inserting the stretching male die is arranged in the stretching female die; the edge pressing assembly is arranged below the stretching female die and distributed around the stretching male die, and can move up and down; the pressing die is arranged in the forming space and above the stretching male die in a vertically movable mode, and the pressing die can be matched with the stretching male die to extrude a workpiece. The stretching forming die structure provided by the utility model can complete the work of stretching the workpiece and shaping the bottom of the workpiece at the same time, can save the subsequent working procedure of shaping the bottom of the workpiece, improves the production efficiency and reduces the cost.

Description

Stretch forming die structure and stretching equipment

Technical Field

The utility model relates to the technical field of stretch forming, in particular to a stretch forming die structure and stretch equipment.

Background

At present, after a workpiece is stretched and formed by conventional stretching equipment, the shape of the bottom of the workpiece cannot meet the product requirement. For example, in the process of producing metal pot products, after a workpiece is stretched and formed by conventional stretching equipment, the bottom shape of the workpiece is usually uneven or convex, however, the metal pot products usually require the bottom of the pot to be flat or concave, and therefore, in order to obtain the required bottom shape, the workpiece needs to be subsequently subjected to bottom shaping. Because a subsequent bottom shaping process is required to be added, the production efficiency of the product is reduced, the productivity is low, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a stretching forming die structure which can complete the work of stretching a workpiece and shaping the bottom of the workpiece at the same time, thereby saving the subsequent bottom shaping process and improving the production efficiency.

The utility model also provides stretching equipment with the stretching forming die structure.

The stretching forming die structure comprises a stretching male die, a stretching female die, a blank holder assembly and a pressing die. The stretching female die is arranged above the stretching male die in a vertically movable manner, and a forming space for inserting the stretching male die is arranged in the stretching female die; the blank pressing assembly is arranged below the stretching female die and distributed around the stretching male die, and can move up and down; the material pressing die is arranged in the forming space and above the stretching male die in a vertically movable mode, and can be matched with the stretching male die to extrude a workpiece.

The stretch forming die structure provided by the embodiment of the utility model at least has the following beneficial effects: in the stretching process, the edge of the workpiece is pressed through the blank pressing assembly and the stretching female die, the workpiece is extruded through the matching of the blank pressing die and the stretching male die, then the stretching female die and the blank pressing assembly move downwards, the workpiece is stretched and formed according to the shape of the stretching male die, and the shaping of the bottom of the workpiece is completed in the lump through the matching of the blank pressing die and the stretching male die along with the stretching of the workpiece, so that the subsequent process of shaping the bottom can be omitted, the production efficiency is improved, and the cost is reduced.

According to some embodiments of the utility model, the bottom surface of the blanking die is an arc-shaped surface arched towards the drawing male die, and the drawing male die is provided with a groove matched with the arc-shaped surface.

According to some embodiments of the utility model, a first die holder is arranged above the drawing matrix, the drawing matrix being detachably mounted to the first die holder.

According to some embodiments of the utility model, a second die holder is provided below the drawing punch, the drawing punch being detachably mounted to the second die holder.

According to some embodiments of the utility model, the blank holder assembly comprises a first base plate and a second base plate, the first base plate and the second base plate are annular, the stretching male die is sleeved with the first base plate and the second base plate, the first base plate is detachably mounted on the second base plate, and the first base plate is located between the second base plate and the stretching female die.

According to some embodiments of the utility model, the blank holder assembly comprises a plurality of groups of base plate modules which are arranged in parallel, the plurality of groups of base plate modules are distributed around the drawing male die, each base plate module comprises a first base plate and a second base plate, the first base plate is detachably mounted on the second base plate, and the first base plate is located between the second base plate and the drawing female die.

The forming space comprises an upper section hole and a lower section hole, the diameter of the upper section hole is gradually increased along the direction from bottom to top, and the inner wall of the lower section hole is used for performing stretch forming on the workpiece.

The drawing apparatus according to the embodiment of the second aspect of the present invention includes the above-described drawing die structure.

The stretching device provided by the embodiment of the utility model has at least the following beneficial effects: by using the stretching forming die structure to stretch and form the workpiece, the stretching of the workpiece and the shaping of the bottom of the workpiece can be completed together, so that the subsequent bottom shaping process is omitted, and the production efficiency is improved.

According to some embodiments of the utility model, the stretching apparatus comprises a table, a first drive mechanism, a second drive mechanism, and a support assembly that is retractable up and down. The stretching forming die structure is arranged on the upper side of the workbench; the first driving mechanism is arranged on the workbench and positioned above the stretching forming die structure, and is in transmission connection with the stretching female die; the second driving mechanism is arranged on the workbench and positioned above the stretching forming die structure, and is in transmission connection with the material pressing die; the support component capable of stretching up and down is installed on the workbench and used for supporting the blank pressing component.

According to some embodiments of the present invention, the first driving mechanism includes a first hydraulic cylinder, the first hydraulic cylinder is mounted on the frame, the first hydraulic cylinder has a first piston rod, a lower end of the first piston rod is connected with the stretching female die, and a receiving cavity is arranged at a lower end of the first piston rod; the second driving mechanism comprises a second piston rod, the upper end of the second piston rod is inserted into the containing cavity in a vertically sliding mode, and the lower end of the second piston rod is connected with the material pressing die.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a stretch-forming die structure (when the workpiece is completely stretched) according to an embodiment of the present invention;

FIG. 2 is a schematic view of a stretch-forming die configuration (at the start of stretching a workpiece) according to an embodiment of the present invention;

fig. 3 is a schematic view of a stretching apparatus according to an embodiment of the present invention.

Reference numerals:

the drawing punch 110, the second die holder 120, the drawing die 210, the first die holder 220, the forming space 211, the blank holder assembly 300, the first cushion plate 310, the second cushion plate 320, the pressing die 400, the frame 500, the first driving mechanism 600, the first hydraulic cylinder 610, the first piston rod 620, the accommodating cavity 621, the second piston rod 700, the support assembly 800, the second hydraulic cylinder 810, the movable plate 820, the support column 830 and the workpiece 900.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 and 2, a stretch forming die structure provided by an embodiment of the first aspect of the present invention includes a stretching male die 110, a stretching female die 210, a blank holder assembly 300, and a blank die 400. The stretching female die 210 is arranged above the stretching male die 110 in a manner of moving up and down, and a forming space 211 into which the stretching male die 110 is inserted is arranged inside the stretching female die 210; the blank holder assembly 300 is arranged below the stretching female die 210 and distributed around the stretching male die 110, and the blank holder assembly 300 can move up and down; the pressing die 400 is movably disposed in the molding space 211 above the drawing punch 110 up and down, and the pressing die 400 can press the workpiece 900 in cooperation with the drawing punch 110.

It can be understood that, during the process of stretching the workpiece 900, the workpiece 900 is extruded by the pressing die 400 and the stretching male die 110, so as to avoid the condition that the bottom of the workpiece 900 is uneven or convex, or the bottom of the workpiece 900 can be directly made into a required concave shape, so that the bottom of the workpiece 900 can be shaped during the process of stretching the workpiece 900.

In the stretching process, the edge of the workpiece 900 is pressed by the edge pressing assembly 300 and the stretching female die 210, the workpiece 900 is extruded by the matching of the pressure die 400 and the stretching male die 110, then the stretching female die 210 and the edge pressing assembly 300 move downwards, the workpiece 900 is stretched and formed according to the shape of the stretching male die 110, and the bottom of the workpiece 900 is shaped by the matching of the pressure die 400 and the stretching male die 110 along with the stretching of the workpiece 900, so that the subsequent working procedure of shaping the bottom of the workpiece 900 can be omitted, the production efficiency is improved, and the cost is reduced.

In the prior art, a bottom shaping process is performed after a stretching process, and a large stress may remain at the bottom of the workpiece 900. It is understood that the bottom of the workpiece 900 is shaped during the stretch forming of the workpiece 900, and the stress generated by the shaping of the bottom of the workpiece 900 is released along with the stretching of the workpiece 900, so that the residual stress of the workpiece 900 after the stretching is completed is relatively small.

It is conceivable that, in the specific implementation process, after the workpiece 900 is stretched, the stretching female die 210 and the blank holder assembly 300 are moved upwards to be reset, and the blank pressing die 400 can be moved upwards to be reset after a period of time, so that the workpiece 900 can be ejected out of the forming space 211 by the blank pressing die 400 to realize unloading.

It is understood that, in the implementation process, a person skilled in the art can determine the shape of the forming space 211 according to the shape of the workpiece 900 to be stretch-formed, for example, for a convoluted workpiece 900, the forming space 211 can be set as a forming hole, and for a non-convoluted workpiece 900, the forming space 211 can be set as a forming groove or a forming hole. The shape of the drawing punch 110 may be determined according to the shape of the work 900 to be drawn, and therefore, is not limited thereto.

It is envisioned that, in some embodiments, when the forming space 211 is configured as a forming hole, the forming hole includes an upper hole and a lower hole, the diameter of the upper hole increases gradually along the direction from bottom to top, and the inner wall of the lower hole is used for stretch forming the workpiece 900. In the process of stretching and forming the workpiece 900, the inner wall of the lower section hole is mainly used for being matched with the stretching male die 110 to stretch the workpiece 900, and the upper section hole is not contacted with the stretched workpiece 900. Through the arrangement, the contact area between the stretched workpiece 900 and the inner wall of the forming hole can be reduced, so that the friction and resistance of the stretched workpiece 900 when the stretched workpiece 900 is separated from the forming hole are reduced, and thus, the acting force of the material pressing die 400 for ejecting the workpiece 900 during discharging is small, and the stretched workpiece 900 can be ejected from the forming hole more easily. It is easy to imagine that when the forming space 211 is a forming groove, the forming groove may be similar to the forming hole, specifically, the forming groove includes an upper groove and a lower groove, and the width between the two sidewalls of the upper groove gradually increases along the direction from bottom to top.

It is conceivable that, referring to fig. 1 and fig. 2, when the bottom of the workpiece 900 needs to be made into a concave bottom shape, in some embodiments, the bottom surface of the pressing die 400 is an arc surface that is arched toward the stretching punch 110, and the stretching punch 110 is provided with a groove that is matched with the arc surface, so that, during the stretching process of the workpiece 900, the pressing die 400 is matched with the stretching punch 110 to extrude the workpiece 900, and the bottom of the workpiece 900 can be extruded to form the concave bottom, so as to meet the design requirements of the product.

In the prior art, when the bottom of a workpiece is made into a concave bottom with a small concave value, the bottom of the workpiece is shaped through a subsequent bottom shaping procedure, so that the shaping is difficult to realize, the shaping quality is unstable, and the product forming effect is poor. When the drawing die structure provided by the utility model is used for drawing and forming the workpiece 900, the drawing of the workpiece 900 and the shaping of the bottom of the workpiece 900 are finished together, and a product with stable quality and concave value of the concave bottom meeting the design requirement can be obtained.

Referring to fig. 1 and 2, it is conceivable that a first die holder 220 is provided above the drawing die 210, and the drawing die 210 is detachably mounted to the first die holder 220, so that the drawing punch 110 can be replaced and maintained for convenience of use.

Referring to fig. 1 and 2, in order to facilitate replacement and maintenance of the drawing punch 110, it is conceivable that a second die holder 120 is provided below the drawing punch 110, and the drawing punch 110 is detachably mounted to the second die holder 120.

Referring to fig. 1 and 2, in some embodiments, the blank holder assembly 300 may include a first cushion plate 310 and a second cushion plate 320, the first cushion plate 310 and the second cushion plate 320 are annular, and the drawing punch 110 is sleeved with the first cushion plate 310 and the second cushion plate 320, so that the first cushion plate 310 and the second cushion plate 320 are distributed around the drawing punch 110. Wherein the first setting plate 310 is detachably mounted to the second setting plate 320, and the first setting plate 310 is positioned between the second setting plate 320 and the drawing die 210, so that the first setting plate 310 can be replaced and maintained. In a specific implementation process, when the stretch forming die structure is used for stretching the convoluted workpiece 900, the first pad plate 310 and the second pad plate 320 may be shaped like circular rings; when the stretch forming die structure is used for stretching a non-convolution type workpiece 900, for example, stretching a U-shaped workpiece 900, the first pad plate 310 and the second pad plate 320 may be formed in a rectangular ring shape, and may also meet the use requirements.

It should be noted that the above-mentioned blank pressing assembly 300 may also adopt other arrangements, for example, in other embodiments, the blank pressing assembly 300 includes a plurality of sets of flush-arranged cushion plate modules, the plurality of sets of cushion plate modules are distributed around the drawing male die 110, the cushion plate modules include a first cushion plate 310 and a second cushion plate 320, the first cushion plate 310 is detachably mounted on the second cushion plate 320, and the first cushion plate 310 is located between the second cushion plate 320 and the drawing female die 210. In a specific implementation, the number and distribution positions of the pad modules may be set according to the shape of the workpiece 900: when the stretch forming die structure is used for stretching the convoluted workpiece 900, more than 3 cushion plate modules can be arranged and distributed circumferentially; when the stretch forming die structure is used for stretching a non-circular workpiece 900, for example, stretching a U-shaped workpiece 900, more than 2 pad modules may be disposed and distributed on both sides of the stretching punch 110.

It is conceivable that in some embodiments, the first cushion plate 310, the stretching female die 210 and the stretching male die 110 may be replaced, so that the corresponding first cushion plate 310, the stretching female die 210 and the stretching male die 110 may be replaced according to the product to be stretch-formed, thereby meeting different production process requirements, and making the stretch-forming die provided by the present invention suitable for producing various products.

According to a second aspect of the utility model, the stretching device is provided with the stretching forming die structure. By using the above stretch forming die structure to stretch form the workpiece 900, the work of stretching the workpiece 900 and shaping the bottom of the workpiece 900 can be completed together, so that the subsequent process of shaping the bottom is omitted, and the production efficiency is improved.

It is envisioned that in some embodiments, the drawing apparatus may be provided with a first driving mechanism 600 by which the drawing female die 210 is driven and a second driving mechanism by which the pressing die 400 is driven; or, the stretching device may also be provided with a driving mechanism, the driving mechanism is used for driving the stretching female die 210, and the driving mechanism is in transmission connection with an elastic telescopic structure, and the elastic telescopic structure is connected with the pressing die 400, so that the pressing die 400 can be driven by the driving mechanism, during the stretching process, the stretching female die 210 and the pressing die 400 move downward, after the pressing die 400 presses the workpiece 900, the stretching female die 210 can continue to move downward, at this time, the elastic telescopic structure contracts, so that the pressing die 400 presses the workpiece 900 on the stretching male die 110.

Specifically, the stretching apparatus may include a frame 500, a first driving mechanism 600, a second driving mechanism, and a support assembly 800 that is retractable up and down. The stretching forming die structure is arranged on the upper side of the frame 500; the first driving mechanism 600 is mounted on the frame 500 and located above the stretch forming die structure, and the first driving mechanism 600 is in transmission connection with the stretch female die 210, so that the stretch female die 210 can be driven to move by the first driving mechanism 600; the second driving mechanism is installed on the frame 500 and located above the stretch forming die structure, and the second driving mechanism is in transmission connection with the material pressing die 400, so that the material pressing die 400 can be driven to move by the second driving mechanism; support assembly 800 that can stretch out and draw back from top to bottom is installed in frame 500, and support assembly 800 is used for supporting blank holder assembly 300, and in tensile process, support assembly 800 supports blank holder assembly 300 to follow the removal of blank holder assembly 300 and carry out concertina movement. In the process of stretch forming, the first driving mechanism 600 drives the stretching female die 210 to move downwards, the second driving mechanism drives the pressing die 400 to move downwards and press the workpiece 900, and then the first driving mechanism 600 drives the stretching female die 210 to continue to move downwards and push the blank holder assembly 300 to move downwards, so that the workpiece 900 is stretched and formed according to the shape of the stretching male die 110, and meanwhile, the bottom of the workpiece 900 is shaped by the pressing die 400.

In the process of stretch forming, the pressure between the pressing die 400 and the stretching male die 110 can be adjusted by the second driving mechanism, so as to ensure that the shape and the size of the bottom of the stretch-formed workpiece 900 meet the requirements, and obtain a product with stable quality.

It is conceivable that the first driving mechanism 600 and the second driving mechanism may be oil presses, and specifically, in some embodiments, the first driving mechanism 600 includes a first hydraulic cylinder 610, the first hydraulic cylinder 610 is mounted on the frame 500, the first hydraulic cylinder 610 has a first piston rod 620, a lower end of the first piston rod 620 is connected to the stretching female die 210, and a lower end of the first piston rod 620 is provided with a receiving cavity 621; the second driving mechanism includes a second piston rod 700, the upper end of the second piston rod 700 is inserted into the accommodating cavity 621 in a vertically slidable manner, and the lower end of the second piston rod 700 is connected to the stretching female die 210. Through the arrangement, the installation of the first driving mechanism 600 and the second driving mechanism can be realized, and as the upper end of the second piston rod 700 is installed in the accommodating cavity 621 of the first piston rod 620, the side wall of the accommodating cavity 621 can be designed into a cylinder body of a hydraulic cylinder of the second driving mechanism, so that the structure can be simplified.

It is conceivable that the first driving mechanism 600 and the second driving mechanism may be arranged in other manners, for example, the first driving mechanism 600 may be arranged as a first screw press, and the second driving mechanism may be arranged as a second screw press, at this time, the first driving mechanism 600 and the second driving mechanism need to be arranged independently, specifically, a mounting platform may be mounted on the frame 500, the mounting platform is located above the stretching female die 210, the first screw press and the second screw press are both mounted on the mounting platform, the first screw press is in transmission connection with a plurality of transmission rods, the transmission rods are distributed around the second screw press, and the transmission rods are connected with the stretching female die 210.

Specifically, the support assembly 800 may include a second hydraulic cylinder 810, a movable plate 820 and a plurality of support columns 830, the frame 500 is provided with an installation cavity below the drawing male die 110, the second hydraulic cylinder 810 is installed in the installation cavity, the movable plate 820 is slidably disposed in the installation cavity up and down, the movable plate 820 is connected to a piston rod 811 of the second hydraulic cylinder 810, the lower end of the support column 830 is connected to the movable plate 820, the upper end of the support column 830 passes through the upper side wall of the installation cavity and abuts against the blank pressing assembly 300, wherein the second hydraulic cylinder 810 may control the pressure of the second hydraulic cylinder 810 through an overflow valve, so that the piston rod 811 of the second hydraulic cylinder 810 may perform a telescopic motion along with the movement of the blank pressing assembly 300, and thus, it may be ensured that the blank pressing assembly 300 can be supported by the support columns 830. It is conceivable that, in some embodiments, the support assembly 800 may also be arranged in other manners, for example, the support assembly 800 may include a sleeve and a support column 830, the sleeve is installed on the rack in the up-down direction, a spring is installed in the sleeve, a lower end of the support column 830 is slidably inserted into the sleeve and abuts against an upper end of the spring, and an upper end of the support column 830 abuts against the blank holder assembly 300.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. Stretch forming die structure, its characterized in that includes:

a drawing punch (110);

the stretching female die (210) is arranged above the stretching male die (110) in a vertically movable mode, and a forming space (211) for the stretching male die (110) to enter is formed in the stretching female die (210);

the blank pressing assembly (300) is arranged below the stretching female die (210) and distributed around the stretching male die (110), and the blank pressing assembly (300) can move up and down;

the pressing die (400) is arranged in the forming space (211) in a vertically movable mode and located above the stretching male die (110), and the pressing die (400) can be matched with the stretching male die (110) to extrude a workpiece (900).

2. The stretch-forming die structure according to claim 1, wherein the bottom surface of the blank die (400) is an arc-shaped surface that is arched toward the stretching punch (110), and the stretching punch (110) is provided with a groove that engages with the arc-shaped surface.

3. The stretch-forming die structure according to claim 1, wherein a first die holder (220) is disposed above the stretch matrix (210), and the stretch matrix (210) is detachably mounted to the first die holder (220).

4. The stretch-forming die structure according to claim 1, wherein a second die holder (120) is provided below the stretching punch (110), and the stretching punch (110) is detachably mounted to the second die holder (120).

5. The stretch-forming die structure according to any one of claims 1 to 4, wherein the binder assembly (300) includes a first backing plate (310) and a second backing plate (320), the first backing plate (310) and the second backing plate (320) are annular, the first backing plate (310) and the second backing plate (320) are both sleeved on the stretch punch (110), the first backing plate (310) is detachably mounted on the second backing plate (320), and the first backing plate (310) is located between the second backing plate (320) and the stretch punch (210).

6. The stretch-forming die structure according to any one of claims 1 to 4, wherein the binder assembly (300) includes a plurality of sets of flush-disposed tie plate modules distributed around the stretching punch (110), the tie plate modules including a first tie plate (310) and a second tie plate (320), the first tie plate (310) being detachably mounted to the second tie plate (320), and the first tie plate (310) being located between the second tie plate (320) and the stretching die (210).

7. The stretch forming die structure according to claim 1, wherein the forming space (211) is provided as a forming hole, the forming hole comprises an upper section hole and a lower section hole, the diameter of the upper section hole is gradually increased along the direction from bottom to top, and the inner wall of the lower section hole is used for stretch forming of the workpiece (900).

8. Drawing apparatus comprising a draw forming die structure according to any one of claims 1 to 7.

9. Stretching apparatus according to claim 8, comprising:

a frame (500), the stretch-forming die structure being disposed on the frame (500);

the first driving mechanism (600) is mounted on the rack (500) and located above the stretching forming die structure, and the first driving mechanism (600) is in transmission connection with the stretching female die (210);

the second driving mechanism is arranged on the rack (500) and positioned above the material pressing die (400), and the second driving mechanism is in transmission connection with the material pressing die (400);

the support assembly (800) capable of extending up and down is installed on the rack (500) and located below the edge pressing assembly (300), and the support assembly (800) is used for supporting the edge pressing assembly (300).

10. Stretching apparatus as in claim 9, wherein said first driving mechanism (600) comprises a first hydraulic cylinder (610), said first hydraulic cylinder (610) being mounted on said frame (500), said first hydraulic cylinder (610) having a first piston rod (620), said first piston rod (620) being connected at its lower end to said stretching die (210), said first piston rod (620) being provided at its lower end with a housing cavity (621); the second driving mechanism comprises a second piston rod (700), the upper end of the second piston rod (700) can be inserted into the accommodating cavity (621) in a vertically sliding mode, and the lower end of the second piston rod (700) is connected with the material pressing die (400).