CN219618008U - Stamping die for processing PET film - Google Patents

Abstract

The utility model relates to a stamping die for processing a PET film, which comprises a die holder, a stamping die and a telescopic mechanism arranged between the die holder and the stamping die, wherein the stamping die comprises an outer die connected with the die holder and provided with a through groove, and an inner die movably arranged in the through groove, an outer cutting edge protruding downwards is arranged below the outer die and used for punching the outer contour of a product, an inner cutting edge protruding downwards and used for punching the inner contour of the product is arranged below the inner cutting die, the outer cutting edge is flat with the bottom of the inner cutting edge, a first punching groove is formed between the outer die and the inner cutting die, the telescopic mechanism comprises an elastic piece connected with the die holder, a top plate connected with the lower end of the elastic piece and a first ejection block connected with the bottom surface of the top plate, the top plate completely covers the through groove, and the first ejection block can be positioned in the first punching groove in an up-down sliding manner. The stamping cutting die is divided into the inner cutting die and the outer cutting die, so that the die processing difficulty is reduced, the die precision is improved, the processing efficiency is improved through the elastic piece and the first ejection block, the product is prevented from being damaged, and the product quality is improved.

Description

Stamping die for processing PET film

Technical Field

The utility model relates to a stamping die for processing a PET film, which is applicable to the technical field of PET film processing.

Background

The PET film is a packaging film with comprehensive performance, has good packaging decoration effect, and can be attached to the surface of an object to be used as a protective film. At present, the processing method of the PET film generally adopts stamping processing, firstly, corresponding punching grooves are milled on the lower surface of a stamping die according to the shape of a product, then the stamping die is arranged on a punching machine, and the PET film raw material is paved on a stamping table top and then punched, so that the required PET film product is formed.

However, the current stamping dies have the disadvantage of not being small. On the one hand, because the PET film has certain hardness and toughness, after the punching processing is finished, products are easy to clamp in punching grooves of a punching die, especially products with narrower widths in annular, strip-shaped and other shapes, are easy to clamp in the punching grooves, are very troublesome to take out subsequently, are easy to damage, and greatly influence the processing efficiency and the product quality. In order to solve the above problems, most of the prior art is to insert foam into the punching slot, and to avoid the punched product from being blocked into the punching slot under the condition of not affecting the punching process by the elasticity of the foam itself. However, the durability of the foam is poor, the foam loses elasticity after multiple stamping processes, the foam needs to be frequently replaced, and the processing efficiency is difficult to effectively improve; furthermore, certain heat can be generated in the stamping process, so that the ageing of foam is accelerated, and the processing efficiency is further reduced.

On the other hand, when the shape of the product is complex, for example, the product is in a ring such as a circle, a square or a triangle, the existing die opening method for milling the punching groove on the lower surface of the punching die is difficult to process, the accuracy of the die is difficult to ensure, and large errors occur in the size of the product, so that the quality of the product is affected.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides a stamping die for processing a PET film.

The technical scheme adopted by the utility model is as follows: a stamping die for processing PET films comprises a die holder, a stamping knife die connected below the die holder, and a telescopic mechanism arranged between the die holder and the stamping knife die.

The stamping cutting die comprises an outer cutting die fixedly connected with a die holder and provided with a through groove which is vertically communicated, and an inner cutting die which is arranged in the through groove in a vertically movable manner, wherein the lower surface of the outer cutting die is provided with an outer cutting edge which is downwards projected and used for punching the outer contour of a product, the lower surface of the inner cutting die is provided with an inner cutting edge which is downwards projected and used for punching the inner contour of the product, the bottom of the outer cutting edge is level with the bottom of the inner cutting edge, a first stamping groove is formed between the outer cutting die and the inner cutting die, and the top of the inner cutting die is provided with a plurality of extending parts which extend outwards; the inner cutting die and the outer cutting die are respectively processed, and the inner cutting die and the outer cutting die are combined to form the complete stamping cutting die, so that the processing difficulty of the stamping cutting die is reduced, the precision of the stamping cutting die is ensured, and the quality of punched products is further ensured.

The telescopic mechanism comprises an elastic piece, a top plate and a first ejection block, wherein the upper end of the elastic piece is connected with the die holder, the top plate is connected with the lower end of the elastic piece, the first ejection block is connected with the bottom surface of the top plate, the projection of the top plate on the horizontal plane completely covers the projection of the through groove on the horizontal plane, and the first ejection block can be positioned in the first punching groove in a sliding manner in the up-down direction. The top plate is driven by the elastic piece to push the first ejection block, and when in punching, the elastic piece is compressed due to the resistance of the PET film to the first ejection block, and then the first ejection block is retracted into the first punching groove, so that the impact on the punching process can be avoided; when the die is opened after the die cutting is finished, the elastic piece stretches, and the first ejection block is pushed by the top plate, so that a processed product is pushed out from the first punching groove, the product is prevented from being blocked in the first punching groove, the die cutting efficiency is improved, and the product quality is guaranteed.

The stamping die is in at least two working states, when the stamping die is in a first working state, the stamping die is in an initial state, and can perform subsequent punching operation, in the state, the bottom surface of the top plate is attached to the top surfaces of the outer cutting die and the inner cutting die, the bottom of the first ejection block is not higher than the bottoms of the outer cutting edge and the inner cutting edge, namely, the bottom of the first ejection block is lower than the bottoms of the outer cutting edge and the inner cutting edge, or the bottom of the first ejection block is leveled with the bottoms of the outer cutting edge and the inner cutting edge.

When the stamping die starts to press down and punch until the first ejection block, the outer cutting edge and the inner cutting edge start to contact the PET film on the working table, the stamping die starts to change from the first working state to the second working state; the outer cutting die is fixedly connected with the die holder, so that the outer cutting edge can be driven by the stamping equipment continuously to cut into the PET film until the punching of the outer contour of the product is completed, the inner cutting edge is slower than the outer cutting edge due to the resistance effect caused by the PET film, but under the effect of self inertia, the pressure generated by the cutting edge on the PET film is still enough to complete the punching of the inner contour of the product, the stamping die is in a second working state after the punching is completed, the bottom of the first ejection block is higher than the bottoms of the inner cutting edge and the outer cutting edge, the elastic piece is compressed, the top plate is propped against the die holder, and the top surface of the inner cutting die is separated from the top plate.

Then, when the stamping die completes punching and die sinking, the elastic piece rebounds and pushes the first ejection block to move downwards, so that the punched product is pushed out of the first punching groove, and the product is prevented from being clamped.

In an alternative embodiment, the bottom of the first ejector block is level with the bottoms of the outer and inner blades when the stamping die is in the first operating state, and the first ejector block contacts the PET film simultaneously with the outer and inner blades when die cutting is started.

In another alternative embodiment, the stamping die is in a first working state, the bottom of the first ejector block is lower than the bottoms of the outer blade and the inner blade, in which case the stamping die also has a transitional state between the first working state and the second working state, when the stamping die is in the transitional state, the bottoms of the first ejector block are level with the bottoms of the inner blade and the outer blade, and the resilient member is compressed to a lesser extent than it is in the second working state. Because the bottom of the first ejecting piece is lower than the bottoms of the outer cutting edge and the inner cutting edge, when stamping is carried out, the first ejecting piece can be contacted with and press the PET film for the first time, so that the PET film is prevented from being shifted in position, and the yield of stamping processing is further improved.

Further, the lower surface of die holder has seted up first storage tank, and the second storage tank has been seted up to the roof in first storage tank, and the roof can reciprocate the ground and set up in first storage tank, and the degree of depth in first storage tank is greater than the thickness of roof, and the elastic component is telescopically inlayed and is established in the second storage tank, and the degree of depth in second storage tank is less than the thickness of elastic component. The top plate and the elastic piece are accommodated in the first accommodating groove and the second accommodating groove, the movable stroke of the top plate can be controlled by adjusting the depth of the first accommodating groove and the second accommodating groove according to the actual thickness and the like of the product, and then the movable stroke of the inner cutting die and the first ejection block can be controlled.

Further, when the stamping die is in the second working state, the top plate abuts against the top wall of the first accommodating groove.

Further, the extension portion is arranged to be a supporting rib, the number, the position and the shape of the supporting grooves are formed in the top surface of the outer cutting die and correspond to the supporting ribs one by one, and when the stamping die is in the first working state, the supporting ribs are located in the corresponding supporting grooves. The inner cutting die and the outer cutting die are assembled through the supporting ribs and the supporting grooves, so that the processing difficulty of the outer cutting die and the inner cutting die is reduced, and the assembling simplicity of the stamping cutting die is improved.

Furthermore, the positions of the top of the first ejection block, which correspond to the supporting ribs, are provided with avoiding grooves for the supporting ribs to pass through, so that the first ejection block can be ensured to move smoothly in the up-down direction.

Further, the lower surface of the outer cutting die is also provided with a first cutting edge which protrudes downwards and is used for punching, the bottom of the first cutting edge is level with the bottom of the outer cutting edge, a second punching groove is formed in the position, located on the inner side of the first cutting edge, of the lower surface of the outer cutting die, the telescopic mechanism further comprises a second ejection block which is arranged in the second punching groove in a vertically movable mode, and the second ejection block is connected with the bottom surface of the top plate. On one hand, the structure and the shape of the first cutting edge can be set according to the actual requirements of products, so that the diversification of the products is improved; on the other hand, the positioning holes can be punched in the PET film through the first cutting edge, so that the positioning in the subsequent processing procedure is facilitated, and the second ejection block can prevent the finished product punched by the first cutting edge from being blocked in the second punching groove.

Further, when the stamping die is in the first working state, the bottom of the second ejection block is not higher than the bottom of the first cutting edge, and is not higher than the bottom of the first cutting edge, namely lower than or even; when the stamping die is in the second working state, the bottom of the second ejection block is higher than the bottoms of the inner cutting edge and the outer cutting edge.

Further, the elastic piece is a polyurethane PU elastomer, and through the characteristics of good strength, small compression deformation, shock absorption, wear resistance, high temperature resistance and the like of the polyurethane PU elastomer material, the output strength of the first ejection block during ejection and the sensitivity during repeated actions are ensured, the service life of the stamping cutting die is prolonged, and the processing efficiency and the product quality are further ensured.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

according to the stamping die for processing the PET film, on one hand, the stamping cutting die is divided into the inner cutting die and the outer cutting die to be respectively processed, so that the processing difficulty of the stamping cutting die is reduced, the precision of the die is improved, and the quality of processed products is further improved; on the other hand through elastic component, roof and first ejecting piece for under the condition that does not influence the processing product, avoid the product card of processing in first punching groove, not only improved the efficiency of processing, still avoided the destruction to the product, further improved product quality.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like components or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is an exploded view of the first embodiment of the present utility model, shown in FIG. 1;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

FIG. 3 is a schematic view of the outer die structure of the embodiment shown in FIG. 1;

FIG. 4 is a schematic view of the stamping die of the embodiment of FIG. 1 in a first operating state;

FIG. 5 is a schematic view of the stamping die of the embodiment of FIG. 1 in a second operating state;

fig. 6 is a schematic diagram of a stamping die in a first working state in a second embodiment of the present utility model;

FIG. 7 is a schematic view of the embodiment of FIG. 6 with the stamping die in a transitional state;

the reference numerals are explained as follows:

1. a die holder; 11. a first accommodating groove; 12. a second accommodating groove; 2. stamping a cutting die; 21. an outer cutting die; 211. an outer blade; 212. a support groove; 213. a first blade; 214. a second punching slot; 215. a through groove; 22. an inner cutting die; 221. an inner blade; 222. a support rib; 23. A first punching slot; 3. a telescoping mechanism; 31. an elastic member; 32. a top plate; 33. a first ejection block; 331. an avoidance groove; 34. and a second ejection block.

Description of the embodiments

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "upper" and "lower" related to the direction description are defined according to the installation direction of the stamping die in the normal processing situation, specifically, the direction of the stamping die toward the ground is "lower" in the normal installation stamping, and vice versa. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Examples

Referring to fig. 1 to 5, the stamping die for processing a PET film in the present embodiment includes a die holder 1, a stamping die 2 connected below the die holder 1, and a telescopic mechanism 3 provided between the die holder 1 and the stamping die 2.

The stamping cutter mold 2 comprises an outer cutter mold 21 fixedly connected with the mold base 1 and provided with a through groove 215 which is vertically penetrated, and an inner cutter mold 22 which is arranged in the through groove 215 in a vertically movable manner, wherein the lower surface of the outer cutter mold 21 is provided with an outer cutter blade 211 which is downwards convexly arranged and used for punching the outer contour of a product, the lower surface of the inner cutter mold 22 is provided with an inner cutter blade 221 which is downwards convexly arranged and used for punching the inner contour of the product, the bottom of the outer cutter blade 211 is level with the bottom of the inner cutter blade 221, a first stamping groove 23 is formed between the outer cutter mold 21 and the inner cutter mold 22, the top of the inner cutter mold 22 is provided with a plurality of extending parts which extend outwards, and the inner cutter mold 22 is connected with the outer cutter mold 21 through the extending parts; the inner cutter die 22 and the outer cutter die 21 are respectively processed and combined to form the complete stamping cutter die 2, so that the processing difficulty of the stamping cutter die 2 is reduced, the precision of the stamping cutter die 2 is ensured, and the quality of punched products is further ensured.

The telescopic mechanism 3 comprises an elastic piece 31, a top plate 32 and a first ejection block 33, wherein the upper end of the elastic piece 31 is connected with the die holder 1, the top plate 32 is connected with the lower end of the elastic piece 31, the first ejection block 33 is connected with the bottom surface of the top plate 32, the projection of the top plate 32 on a horizontal plane completely covers the projection of the through groove 215 on the horizontal plane, and the first ejection block 33 is slidably positioned in the first punching groove 23 in the up-down direction; the top plate 32 is driven by the elastic piece 31 to push the first ejection block 33, and when in punching, the elastic piece 31 is compressed due to the resistance of the PET film to the first ejection block 33, and then the first ejection block 33 is retracted into the first punching groove 23, so that the impact on the punching process can be avoided; when the die is opened after the die cutting is finished, the elastic piece 31 stretches, and the first ejection block 33 is pushed by the top plate 32, so that a finished product is pushed out of the first punching groove 23, the product is prevented from being blocked in the first punching groove 23, the die cutting efficiency is improved, and the product quality is guaranteed.

The stamping die has at least two working states, when the stamping die is in a first working state, the bottom surface of the top plate 32 is attached to the top surfaces of the outer cutting die 21 and the inner cutting die 22, and the bottom of the first ejection block 33 is parallel to the bottoms of the outer cutting edge 211 and the inner cutting edge 221; when the stamping die is in the second working state, the bottom of the first ejection block 33 is higher than the bottoms of the inner blade 221 and the outer blade 211, the elastic member 31 is compressed, the top plate 32 abuts against the die holder 1, and the top surface of the inner die 22 is separated from the top plate 32.

In a more preferred embodiment, the lower surface of the die holder 1 is provided with a first accommodating groove 11, the top wall of the first accommodating groove 11 is provided with a second accommodating groove 12, the top plate 32 is movably arranged in the first accommodating groove 11, the depth of the first accommodating groove 11 is greater than the thickness of the top plate 32, the elastic piece 31 is telescopically embedded in the second accommodating groove 12, and the depth of the second accommodating groove 12 is smaller than the thickness of the elastic piece 31. The top plate 32 and the elastic piece 31 are accommodated by the first accommodating groove 11 and the second accommodating groove 12, and the movable stroke of the top plate 32 can be controlled by adjusting the depth of the first accommodating groove 11 and the second accommodating groove 12 according to the actual thickness of the product, and the like, so that the movable stroke of the inner cutter die 22 and the first ejection block 33 can be controlled. Specifically, when the stamping die is in the second working state, the top plate 32 abuts against the top wall of the first accommodating groove 11.

In a more preferred embodiment, the extending portion is provided as a supporting rib 222, and the top surface of the outer die 21 is provided with supporting grooves 212 corresponding to the supporting ribs 222 in number, position and shape, and the supporting ribs 222 are located in the corresponding supporting grooves 212 when the stamping die is in the first working state. The inner cutter die 22 and the outer cutter die 21 are assembled through the supporting ribs 222 and the supporting grooves 212, so that the processing difficulty of the outer cutter die 21 and the inner cutter die 22 is reduced, and the assembling simplicity of the stamping cutter die 2 is improved.

In a more preferred embodiment, the top of the first ejection block 33 is provided with a recess 331 corresponding to the supporting rib 222 for the supporting rib 222 to pass through, so as to ensure that the first ejection block 33 can move smoothly in the up-down direction.

In a more preferred embodiment, the lower surface of the outer die 21 is further provided with a first cutting edge 213 protruding downwards for punching, the bottom of the first cutting edge 213 is parallel to the bottom of the outer cutting edge 211, a second punching slot 214 is formed in the portion of the lower surface of the outer die 21 located inside the first cutting edge 213, the telescopic mechanism 3 further comprises a second ejection block 34 movably arranged in the second punching slot 214 up and down, and the second ejection block 34 is connected to the bottom surface of the top plate 32. On one hand, the structure and the shape of the first blade 213 can be set according to the actual requirements of the products, so that the diversity of the products is improved; on the other hand, the positioning holes can be punched in the PET film through the first cutting edge 213, so that the positioning in the subsequent processing procedure is facilitated, and the second ejection block 34 can prevent the finished product punched by the first cutting edge 213 from being blocked in the second punching groove 214. Specifically, when the stamping die is in the first working state, the bottom of the second ejection block 34 is not higher than the bottom of the first blade 213, and "not higher" means lower or even; when the stamping die is in the second working state, the bottom of the second ejector block 34 is higher than the bottoms of the inner blade 221 and the outer blade 211.

In a more preferred embodiment, the elastic member 31 is a polyurethane PU elastomer, and by virtue of the characteristics of good strength, small compression deformation, shock absorption, wear resistance, high temperature resistance and the like of the polyurethane PU elastomer material, not only the output strength of the first ejection block 33 during ejection and the sensitivity during repeated actions are ensured, but also the service life of the stamping cutting die 2 is prolonged, and further the processing efficiency and the product quality are ensured.

The processing flow comprises the following steps: when the stamping process is started, the stamping die is in a first working state. And then the stamping equipment drives the stamping die to press downwards until the first ejection block, the outer cutting edge and the inner cutting edge start to contact with the PET film on the workbench surface, and the stamping die starts to be converted from the first working state to the second working state. In the process, the outer cutter die is fixedly connected with the die holder, and can be driven by the stamping equipment to continuously cut downwards, so that the outer cutter blade rapidly cuts into the PET film until the outer cutter blade completes the punching of the outer contour of the product and is abutted against the working table; the first ejection block receives resistance caused by the PET film and conducts the resistance upwards, the top plate is pushed to be separated from the top surface of the inner cutting die until the top plate is propped against the die holder, the elastic piece is forced to be compressed, when the outer cutting edge is punched and stopped, the bottom surface of the first ejection block is propped against a product on the working table surface, the elastic piece is continuously in a compressed state, and the bottom of the first ejection block is higher than the bottom of the outer cutting edge; the inner cutting edge is slower than the outer cutting edge in cutting into the PET film due to the resistance effect caused by the PET film, but under the action of the self inertia, the pressure generated by the cutting edge on the PET film is still enough to complete the punching of the inner contour of the product until the bottom of the inner cutting edge is propped against the working table surface and is leveled with the bottom of the outer cutting edge, and the stamping die is in a second working state. After the punching processing of the inner contour and the outer contour of the product is completed, the punching equipment drives the punching die to move upwards, the first ejection block pushes out the product under the action of the elastic piece, the product is prevented from being blocked in the first punching groove, and the punching processing efficiency and the processed product quality are improved. And meanwhile, the stamping die is restored to the first working state, so that the next stamping process is facilitated.

Examples

Referring to fig. 6 to 7, the present embodiment differs from the first embodiment only in that the bottom of the first ejection block 33 is lower than the bottoms of the outer blade 211 and the inner blade 221 when the press mold is in the first working state, and in this embodiment, the press mold further has a transitional state between the first working state and the second working state, and when the press mold is in the transitional state, the bottom of the first ejection block 33 is leveled with the bottoms of the inner blade 221 and the outer blade 211, and the elastic member 31 is compressed to a degree smaller than that in the second working state. When punching is performed, the first ejection block 33 can be used for firstly contacting and pressing the PET film, so that the PET film is prevented from being shifted in position, and the yield of punching processing is further improved.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims (9)

1. A stamping die for processing PET membrane, its characterized in that: the device comprises a die holder (1), a stamping knife die (2) connected below the die holder (1) and a telescopic mechanism (3) arranged between the die holder (1) and the stamping knife die (2);

the stamping cutter die (2) comprises an outer cutter die (21) fixedly connected with the die holder (1) and provided with a through groove (215) which is vertically penetrated, and an inner cutter die (22) which is vertically movably arranged in the through groove (215), wherein the lower surface of the outer cutter die (21) is provided with an outer cutter blade (211) which is downwards convexly arranged and used for punching the outer contour of a product, the lower surface of the inner cutter die (22) is provided with an inner cutter blade (221) which is downwards convexly arranged and used for punching the inner contour of the product, the bottom of the outer cutter blade (211) is level with the bottom of the inner cutter blade (221), a first punching groove (23) is formed between the outer cutter die (21) and the inner cutter die (22), the top of the inner cutter die (22) is provided with a plurality of extension parts which outwards extend, and the inner cutter die (22) is connected with the outer cutter die (21) through the extension parts;

the telescopic mechanism (3) comprises an elastic piece (31) with the upper end connected with the die holder (1), a top plate (32) with the top surface connected with the lower end of the elastic piece (31) and a first ejection block (33) connected with the bottom surface of the top plate (32), the projection of the top plate (32) on a horizontal plane completely covers the projection of the through groove (215) on the horizontal plane, and the first ejection block (33) is slidably arranged in the first punching groove (23) in the up-down direction;

the stamping die is in at least two working states, when the stamping die is in a first working state, the bottom surface of the top plate (32) is attached to the top surfaces of the outer cutting die (21) and the inner cutting die (22), and the bottom of the first ejection block (33) is not higher than the bottoms of the outer cutting edge (211) and the inner cutting edge (221); when the stamping die is in the second working state, the bottom of the first ejection block (33) is higher than the bottoms of the inner cutting edge (221) and the outer cutting edge (211), the elastic piece (31) is compressed, the top plate (32) abuts against the die holder (1), and the top surface of the inner cutting die (22) is separated from the top plate (32).

2. The stamping die for processing PET film according to claim 1, wherein: when the stamping die is in a first working state, the bottom of the first ejection block (33) is lower than the bottoms of the outer cutting edge (211) and the inner cutting edge (221), the stamping die also has a transition state between the first working state and the second working state, when the stamping die is in the transition state, the bottom of the first ejection block (33) is level with the bottoms of the inner cutting edge (221) and the outer cutting edge (211), and the elastic piece (31) is compressed and the compression degree is lower than that of the elastic piece in the second working state.

3. The stamping die for processing PET film according to claim 1, wherein: the die holder is characterized in that a first accommodating groove (11) is formed in the lower surface of the die holder (1), a second accommodating groove (12) is formed in the top wall of the first accommodating groove (11), a top plate (32) is arranged in the first accommodating groove (11) in a vertically movable mode, the depth of the first accommodating groove (11) is larger than the thickness of the top plate (32), and an elastic piece (31) is telescopically embedded in the second accommodating groove (12), and the depth of the second accommodating groove (12) is smaller than the thickness of the elastic piece (31).

4. A stamping die for processing PET film according to claim 3, characterized in that: when the stamping die is in the second working state, the top plate (32) abuts against the top wall of the first accommodating groove (11).

5. The stamping die for processing PET film according to claim 1, wherein: the extension portion is arranged to be a supporting rib (222), the top surface of the outer cutting die (21) is provided with supporting grooves (212) with the number, the positions and the shapes corresponding to the supporting ribs (222) one by one, and when the stamping die is in a first working state, the supporting ribs (222) are located in the corresponding supporting grooves (212).

6. The stamping die for processing PET film according to claim 5, wherein: the top of the first ejection block (33) is provided with avoidance grooves (331) which are used for the support ribs (222) to pass through, and the positions of the top of the first ejection block corresponding to the support ribs (222) are provided with avoidance grooves (331).

7. The stamping die for processing PET film according to claim 1, wherein: the lower surface of outer cutting die (21) still has downward bulge setting and is used for die-cut first cutting edge (213), the bottom of first cutting edge (213) with the bottom of outer cutting edge (211) is level, second punching groove (214) have been seted up at the position that outer cutting die (21) lower surface is located first cutting edge (213) inboard, telescopic machanism (3) still including but set up with reciprocating in second punching groove (214) in ejecting piece (34) of second, ejecting piece (34) of second with the bottom surface of roof (32) is connected.

8. The stamping die for processing PET film according to claim 7, wherein: when the stamping die is in a first working state, the bottom of the second ejection block (34) is not higher than the bottom of the first cutting edge (213); when the stamping die is in the second working state, the bottom of the second ejection block (34) is higher than the bottoms of the inner cutting edge (221) and the outer cutting edge (211).

9. The stamping die for processing PET film according to claim 1, wherein: the elastic piece (31) is polyurethane PU elastomer.